US20110104485A1 - Self-adhesive material for wood board and wood board - Google Patents

Self-adhesive material for wood board and wood board Download PDF

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Publication number
US20110104485A1
US20110104485A1 US12/918,297 US91829709A US2011104485A1 US 20110104485 A1 US20110104485 A1 US 20110104485A1 US 91829709 A US91829709 A US 91829709A US 2011104485 A1 US2011104485 A1 US 2011104485A1
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United States
Prior art keywords
self
adhesive material
wood board
wood
groups
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Abandoned
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US12/918,297
Inventor
Samantha Kiljunen
Marjaliisa Asikainen
Gatja Tiusanen
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UPM Plywood Oy
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UPM Kymmene Wood Oy
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Filing date
Publication date
Priority claimed from FI20085147A external-priority patent/FI20085147A0/en
Priority claimed from FI20085152A external-priority patent/FI20085152A0/en
Priority claimed from FI20085465A external-priority patent/FI20085465A0/en
Application filed by UPM Kymmene Wood Oy filed Critical UPM Kymmene Wood Oy
Assigned to UPM-KYMMENE WOOD OY reassignment UPM-KYMMENE WOOD OY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TIUSANEN, GATJA, KILJUNEN, SAMANTHA, ASIKAINEN, MARJALIISA
Publication of US20110104485A1 publication Critical patent/US20110104485A1/en
Abandoned legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27DWORKING VENEER OR PLYWOOD
    • B27D1/00Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B27D1/04Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27DWORKING VENEER OR PLYWOOD
    • B27D1/00Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B27D1/04Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
    • B27D1/08Manufacture of shaped articles; Presses specially designed therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/02Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board the layer being formed of fibres, chips, or particles, e.g. MDF, HDF, OSB, chipboard, particle board, hardboard
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/04Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B21/08Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/14Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood board or veneer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/18Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284Application of adhesive
    • B32B37/1292Application of adhesive selectively, e.g. in stripes, in patterns
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/18Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04Interconnection of layers
    • B32B7/10Interconnection of layers at least one layer having inter-reactive properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04Interconnection of layers
    • B32B7/12Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18Manufacture of films or sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/50Properties of the layers or laminate having particular mechanical properties
    • B32B2307/542Shear strength
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/50Properties of the layers or laminate having particular mechanical properties
    • B32B2307/554Wear resistance
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2317/00Animal or vegetable based
    • B32B2317/16Wood, e.g. woodboard, fibreboard, woodchips
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2479/00Furniture
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00Vehicles
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2351/00Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • C08J2351/06Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/28Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2848Three or more layers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/28Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2852Adhesive compositions
    • Y10T428/2878Adhesive compositions including addition polymer from unsaturated monomer
    • Y10T428/2891Adhesive compositions including addition polymer from unsaturated monomer including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31855Of addition polymer from unsaturated monomers
    • Y10T428/3188Next to cellulosic
    • Y10T428/31895Paper or wood

Definitions

  • the invention relates to a self-adhesive material for a wood board as defined in the preamble of claim 1 and to a wood board as defined in the preamble of claim 16 .
  • Wood boards meant here are, for example, plywood, particle boards and hard and medium hard fiber boards. These products need often a coating over them to protect the base product or to give some specific surface property to them.
  • Coatings used for wood products are normally some organic polymers, very often resins like phenolic resins and melamine resins. Thermoplastic coatings are also used, but the problem with them is how to adhere them to wood panels or products. Polymer priming is one method with the use of hot-melt glues.
  • maleated polyethylene MAPP
  • maleated polypropylene MAPP
  • cellulose fibers can be surface modified with polypropylene-maleic anhydride copolymer.
  • the film comprises in one embodiment maleic anhydride grafted ethyl-vinyl acetate co-polymer (MA-g-EVA). No treatment, e.g. no activation, of the film during film manufacture is employed.
  • MA-g-EVA maleic anhydride grafted ethyl-vinyl acetate co-polymer
  • the objective of the invention is to disclose a new type of self-adhesive material and the attachment of the material to a wood board.
  • the invention aims to solve coating and gluing the veneers of the wood board with a complete new and very simple way.
  • a self-adhesive material for a wood board and a wood board according to the invention are characterized by what is presented in the claims.
  • the invention is based on a self-adhesive material for a wood board, e.g. for gluing and/or coating.
  • the self-adhesive material is formed of polyolefin film having a melt index is ⁇ 4 g/10 min (measured 190° C./2.16 kg), the polyolefin film contains reactive groups with —OH groups of the wood for forming self-adhesive properties.
  • Polyolefin film is a self-adhesive by means of the reactive groups.
  • the invention is based on a wood board, which wood board is formed so that the veneers of the wood board are joined together.
  • the wood board is manufactured by said self-adhesive material so that the self-adhesive material is used as a coating onto board and/or as a glue-line material between veneers.
  • the invention is specifically based on the self adhesive film.
  • the self-adhesive film is grafted by reactive groups, e.g. maleic anhydride groups, which react and form covalent bonds with —OH groups in other material e.g. natural products like wood or wood derivative products.
  • reactive groups e.g. maleic anhydride groups
  • the melt index being ⁇ 4 g/10 min (measured 190° C./2.16 kg) makes the activation of the reactive groups possible in film form.
  • a wood board refers to any wood panel product, plywood product, particle board, fiberboard, composite product, beam, pressed panel product or the like, formed of a number of veneers and principally of wood-based materials, in which the veneers are laid one upon the other and glued together.
  • a wood board refers to any wood product or fiber product.
  • a veneer refers to any layer of material, typically a thin layer of material. In a preferable embodiment the wood board is plywood.
  • a wood board according to the invention can comprise veneer layers of different thickness.
  • the thicknesses of the veneer layers can vary.
  • the veneer layers can be arranged in the desired position, i.e. crosswise or lengthwise in the desired order.
  • the polyolefin film is at least partially cross-linked.
  • the polyolefin film comprises at least two layers which are the first and second layer, and at least the first layer is a self-adhesive layer so that it contains reactive groups with —OH groups of the wood.
  • the second layer is at least partially cross-linked.
  • the first layer is at least partially cross-linked.
  • the second layer contains also reactive groups with —OH groups of the wood.
  • at least one additive layer is arranged between the first and second layers.
  • the film can comprises more than one additive layers e.g. 2-10 additive layers.
  • the additive layer can contain functional additive.
  • the additive layer can contain, for example, fire retardants, UV-stabilisers and fillers.
  • polyolefin is selected from group: polyethylene, polypropylene and their combinations.
  • the polyolefin film or each layer can include additives and fillers.
  • the polyolefin film and/or the film layers can be made from petrochemical and renewable feedstock materials.
  • bio-based polymers can be used.
  • the bio-based polymers have processing temperature over 180° C. or over 190° C.
  • all film layers are substantially formed of the same material.
  • at least one film layer is formed of a different material than the other films layers.
  • Compatibilisers can be added to the film in order to adhere the dissimilar polymers to each other.
  • the reactive groups of the polyolefin film is activated at temperatures of more than 180° C., in one embodiment at temperatures of more than 190° C., during the manufacturing of the self-adhesive material.
  • the sufficient time for activation is about 0.5-3 minutes, in one embodiment about 2-3 minutes. Then the film formed contains activated functional groups capable of forming the maximum number of covalent bonds with wood.
  • the polyolefin film contains maleated polyolefin which contains maleic anhydride reactive groups.
  • the film layer contains polyethylene (PE), polypropylene (PP), maleic anhydride polyethylene (MAPE), maleic anhydride polypropylene (MAPP) or derivates thereof or their combinations.
  • at least one film layer contains maleic anhydride polyolefin.
  • the outer film layers contain maleic anhydride polyolefin.
  • a laminated layer can be added onto the self-adhesive material.
  • the laminating improves mechanical properties and scratch resistant of the self-adhesive material.
  • the polyolefin films can be adhered directly to the wood when the film is maleated at least on one side and especially when the maleated layer is treated so that its temperature during manufacturing has been over 180° C. or 190° C., so that maleic acid is converted to maleic anhydride.
  • Maleic anhydride is very reactive with wood, forming a covalent bond with celluloses —OH groups. Without this activation, normal maleated film forms predominantly hydrogen bonds, which are much weaker than covalent chemical bonds. So we also can bond polyolefin film directly to wood without any priming and joining layers.
  • the self-adhesive material and the wood board are joined together by means of the maleic anhydride polyolefin.
  • the maleic anhydride polyolefin forms chemical and mechanical bonds between the polyolefin film and the veneer of the wood board.
  • the film or the film layer which includes maleated polyolefin also contains polymer e.g. polyethylene or polypropylene.
  • the film layer including maleated polyolefin essentially consists of MAPE+PE or MAPP+PP.
  • maleated polyolefin contains maleic acid 0.3-15% by weight of the maleated polyolefin, in one embodiment 1-5% by weight of the maleated polyolefin.
  • the film layer is maleated to the desired degree in order to improve friction and wetting properties of the self-adhesive material.
  • the polyolefin film contains iso-cyanate grafted polyolefin which contains reactive groups.
  • the polyolefin film or layer of the film is grafted with alkoxysilane containing reactive functional groups with the polyolefin.
  • the polyolefin film is grafted with hydrolysable vinyl-mono-, -di- or -tri-alkoxysilane.
  • vinyl group can be replaced with isosyanate- or epoxy groups.
  • Alkoxysilanes alcohol groups can be methyl-, ethyl-, propyl- or isopropyl-groups and silane can contain 1, 2 or 3 alkoxy-groups.
  • the polyolefin film is cross-linked by a method selected from group: silane moisture method, electron beam (EB) radiation, vinyl-silane hydrolysis and their combinations.
  • the cross-linking can be made before the film is pressed to wooden surface or on veneer of the wood board. Alternatively the cross-linking can be made after the manufacturing the wood board into final product.
  • the thickness of the polyolefin film may vary depending on the properties of the film materials and the application of the wood board.
  • the wood board can be made using apparatuses and methods known per se. Laying the veneers one upon the other, joining them together and other typical steps in making the wood board can be performed in any manner known per se in the art.
  • the self-adhesive material can be prepared using apparatuses and methods known per se, e.g. by extrusion or by co-extrusion.
  • Arranging the self-adhesive material of the invention on the surface or between the veneers of the wood board can be performed e.g. using the hot-pressing technique, extruder technique, film technique, roll application technique, cylinder application technique, coat and multi-layer coat application technique, all known per se, their combinations or a corresponding technique.
  • the veneers can be joined together e.g. using the hot-pressing technique.
  • a catalyst is used in self-adhesive material manufacturing.
  • the catalyst increases the frequency of the covalent bonds formed between coupling agent, e.g. maleic anhydride, and wood.
  • coupling agent e.g. maleic anhydride
  • the catalyst is hydrated zinc acetate.
  • the catalyst cannot be extruded in the same layer as the coupling agent, e.g. maleic anhydride because it will open the maleic anhydride cyclic ring. Therefore, the catalyst can be applied to the films after extrusion and activated by heat during hot-pressing or applied directly to the wood.
  • Alternatives are to extrude films of varying thickness (0,05-0.1 mm) such that one film contains catalyst in the outer layers and another the activated coupling agent such that the films are then during hot-pressing melt blended and reaction with the wood.
  • the polyolefin film can be prepared by using catalysts known per se.
  • the self-adhesive material is attached onto the veneers of the wood board by hot-pressing at temperatures of 120-170° C.
  • the self-adhesive material is attached to the veneer by reactive groups.
  • a benefit of one embodiment of this invention is that temperatures of only 120-140° C. are needed to fix the film onto the veneer surface.
  • the hot-pressing conditions like temperature, pressure and time, depend on the wood type, e.g. spruce or birch, and polyolefin melting temperature. It is important in order to induce plastic melt flow that the hot-pressing temperature is set to a temperature 20-50° C. above the melting temperature of the polymer.
  • the surface properties can be modified using fillers in the surface layer and using different degrees of maleation.
  • High density maleation on the surface modifies its properties in the direction of polar material wetting, which also means a higher friction coefficient. This is a positive improvement especially in transport industry.
  • This maleated surface is also excellent surface for painting especially with water based paints.
  • Polar groups will also wet the surface at sterilization with H 2 O 2 or HClO or other desinfective materials, used in slaughterings, meat and fish transport vehicles etc.
  • the invention makes it possible to prepare self-adhesive films. Adhesion of the self-adhesive material on wood is excellent.
  • the self-adhesive material and the wood board in accordance with the invention are suitable for various applications.
  • the wood board can be used for applications where high wear resistance is needed, e.g. side walls of vans, trailers, horse boxes, kitchens and furniture, play ground equipment, sports equipment, flight cases and sign boards.
  • FIG. 1 shows a schematic diagram of the chemical reactions
  • FIG. 2 shows a self-adhesive material structure according to the invention.
  • FIG. 1 discloses a schematic diagram of the chemical reactions in the manufacturing the self-adhesive material and the wood board, e.g. plywood.
  • the plywood of the invention there are many steps. First is selection of the raw materials. Then is the conversion of the maleated material from maleic acid to maleic anhydride. The self-adhesive film is made it needs to be attached to the plywood where the active maleic anhydride groups react with the hydroxide groups of the wood.
  • FIG. 2 discloses a self-adhesive material structure of the invention.
  • the self-adhesive material is formed of a film which comprises three layers: first ( 1 ), second ( 2 ) and additive ( 3 ) layers.
  • the first layer is a bottom layer ( 1 )
  • second layer is a top layer ( 2 )
  • additive layer ( 3 ) is arranged between the first and second layers.
  • the top film layer ( 2 ) is formed of polyolefin, e.g. polyethylene or polypropylene, and maleated polyolefin, e.g. maleic anhydride polyethylene (MAPE) or maleic anhydride polypropylene (MAPP), including additives and fillers.
  • the top film layer can be cross-linked.
  • the bottom layer ( 1 ) is formed of MAPE or MAPP.
  • the additive layer ( 3 ) is sandwiched between the top layer ( 2 ) and the bottom layer ( 1 ).
  • the additive layer is formed of polyethylene or polypropylene including additives, like fire retardants and UV-stabilisers, and fillers.
  • the self-adhesive material and the wood board used in the tests can be prepared following.
  • the three-layer self-adhesive film is prepared of polyolefin, maleated polyolefin and additives and fillers by co-extruding.
  • Maleated polyolefin contains maleic acid which is converted maleic anhydride at temperatures of more than 190° C. during the manufacturing of the film.
  • the top film layer can be cross-linked by electron beam radiation at this stage.
  • the layers of the film are joined together for forming the film.
  • the formed film is cut to size and is arranged between the veneers of the wood board and/or onto the wood board as a coating.
  • the veneers of the wood board are bound together and/or the coating is attached on the surface by hot pressing, cold pressing and/or high frequency pressing.
  • the hot pressing is made at temperatures of about 120-140° C., at pressure of about 1.2-1.9 N/mm 2 and by time of 2-8 minutes.
  • the cold pressing can follow the hot pressing.
  • the cold pressing is made until the temperature falls below 80-100° C., at pressure of about 1.2-1.7 N/mm 2 and by time of 0.5-minutes.
  • the high frequency pressing is made by frequency of 13.10 MHz and time of about 2-5 minutes.
  • the self-adhesive material can be cross-linked by radiation or silane-moisture method at this stage.
  • a wood board can be plywood, particle board, high or middle density fiberboard, or some other pressed and glued board containing wood or other plant fibers.
  • a compatibiliser material is required in the self-adhesive material to join the dissimilar materials.
  • the maleated polyolefin contains normally 2-15% maleic acid of the amount of polyolefin. At extrusion at temperatures of more 180° C. the maleic acid is converted to maleic anhydride, partially or totally.
  • the polymer film can also be cross-linkable if it in any case improves the use of the products.
  • the self-adhesive material of FIG. 2 used in the tests was prepared.
  • the tests are carried out as following.
  • Adhesion of the coating to the plywood was measured by three different methods peel test (ISO4578, SFS-EN204), the result was the separation force as a function of coating length (25 mm).
  • the second test was the dolly test (EN311) and the third test was the shearing test. In the case of the shearing test and peeling test the measurements could be made after soaking and boiling in addition to the dry samples. However, the dolly test could only be performed on dry samples.
  • Table 2 discloses birch plywood coating adhesive properties peeling (ISO 4578, SFS-EN204) and pull strength (dolly test, EN311).
  • the melt index of the polyethylene is MI-0.3 g/10 min (190° C./2.16 kg).
  • the coupling agents are Fusabond MD-353D (MAPP) and Fusabond MB-226DE (MAPE). Pressing conditions are: Temp. 130-150° C., Pressure 1.8 N/mm 2 and Time 8 minutes.
  • Table 3 discloses birch plywood coating adhesive properties peel strength measured for dry samples and after soaking and boiling.
  • the melt index (MI) of the polyethylene is 0.3 (190° C./2.16 kg) except where specified as HDPE or MDPE and then MI-0.2 g/10 min (190° C./2.16 kg) or MI-0.7 g/10 min (190° C./2.16 kg) respectively is used.
  • Hot pressing conditions are: Temp. 135-160° C., Pressure 1.7 N/mm 2 and Time 3.5-8 minutes.
  • the coupling agent used was Fusabond MB-226DE unless otherwise specified.
  • Table 4 discloses birch plywood coating adhesion properties peeling (ISO 4578, SFS-EN204) and shear strength perpendicular to the surface (EN319) after different pretreatments (dry, soaking, boiling, EN204) for uncross-linked and cross-linked coated (0.27 mm) plywood. Hot-pressing: 7 minutes, 135° C. and 1.7 N/mm 2 .
  • the coupling agent used was Fusabond MB-226DE unless otherwise stated.
  • the mono film contained no MAPE it was just LDPE (MI-0.3 g/10 min, 190° C./2.16 kg).
  • the aim of using just polyethylene to coat the surface was to show the effect of having no coupling agent. The results were acceptable for dry conditions but after boiling the wood failure was 9%. Therefore failure was in the coating. This shows the importance of forming a chemical bond.
  • Table 5 discloses birch plywood coating adhesive properties peel (ISO 4578 and SFS-EN204) and shear strength perpendicular to the surface (EN319) after different pretreatments (soaking, boiling, EN204) for low viscosity films (MI-4 g/10 min (190° C./2.16 kg) in all layers). The films could not be extruded above 170° C.
  • Table 6 discloses birch plywood coated with multi-layered dissimilar self-adhesive coating properties (scratch, boiling resistance and delamination of polypropylene or polyamide). Hot-pressing conditions are: Temp. 140, Pressure 1.7 N/mm 2 and Time 8 min.
  • the scratch test is performed using an Erichsen test pen (Model 318). The test was developed by Robert Boch GmBH. Samples 100 ⁇ 100 mm are prepared and then the pen is applied which has forces (2-20 N). The surface is simply scratched using the pen the scratch force is increased from 2-20 N in steps of 2N. The first scratch that can be seen by the naked eye is the force that the coating can take and therefore the scratch resistance level.
  • Table 7 discloses birch plywood coating hardness (DIN 53505) and scratch resistance properties for different coatings compared with other coating materials for plywood.
  • the different maleated polymers used are Fusabond MD-353D (MAPP), and Fusabond MB-226DE (MAPE).
  • a self-adhesive material and a wood board according to the invention are suitable in its different embodiments for different types of applications.

Abstract

The invention relates to a self-adhesive material for a wood board. In accordance with the invention, the self-adhesive material is formed of polyolefin film having a melt index is ≦4 g/10 min (measured 190° C./2.16 kg), and the polyolefin film contains reactive groups with —OH groups of the wood for forming self-adhesive properties. Further, the invention relates to a wood board in which the self-adhesive material is used as a coating and/or as a glue-line material.

Description

    FIELD OF THE INVENTION
  • The invention relates to a self-adhesive material for a wood board as defined in the preamble of claim 1 and to a wood board as defined in the preamble of claim 16.
  • BACKGROUND OF THE INVENTION
  • Known from prior art are various wood boards. Wood boards meant here are, for example, plywood, particle boards and hard and medium hard fiber boards. These products need often a coating over them to protect the base product or to give some specific surface property to them.
  • Coatings used for wood products are normally some organic polymers, very often resins like phenolic resins and melamine resins. Thermoplastic coatings are also used, but the problem with them is how to adhere them to wood panels or products. Polymer priming is one method with the use of hot-melt glues.
  • For preparing the wood board resins and various gluing material are used to glue and join together veneers of the wood board. Known from prior art is to glue veneer layers together, e.g. with a polyurethane or phenolic glue.
  • Also known is to use maleated polyethylene (MAPE) or maleated polypropylene (MAPP) for making wood fiber-polymer composites, where the maleated polymer is used as a coupling agent between the fiber and polymer. Known is that cellulose fibers can be surface modified with polypropylene-maleic anhydride copolymer.
  • Further, known from patent application EP 0782917 is the preparation of a coated board with extruded films. The film comprises in one embodiment maleic anhydride grafted ethyl-vinyl acetate co-polymer (MA-g-EVA). No treatment, e.g. no activation, of the film during film manufacture is employed.
  • OBJECTIVE OF THE INVENTION
  • The objective of the invention is to disclose a new type of self-adhesive material and the attachment of the material to a wood board. The invention aims to solve coating and gluing the veneers of the wood board with a complete new and very simple way.
  • SUMMARY OF THE INVENTION
  • A self-adhesive material for a wood board and a wood board according to the invention are characterized by what is presented in the claims.
  • The invention is based on a self-adhesive material for a wood board, e.g. for gluing and/or coating. In accordance with the invention, the self-adhesive material is formed of polyolefin film having a melt index is ≧4 g/10 min (measured 190° C./2.16 kg), the polyolefin film contains reactive groups with —OH groups of the wood for forming self-adhesive properties. Polyolefin film is a self-adhesive by means of the reactive groups.
  • Further, the invention is based on a wood board, which wood board is formed so that the veneers of the wood board are joined together. In accordance with the invention, the wood board is manufactured by said self-adhesive material so that the self-adhesive material is used as a coating onto board and/or as a glue-line material between veneers.
  • The invention is specifically based on the self adhesive film. The self-adhesive film is grafted by reactive groups, e.g. maleic anhydride groups, which react and form covalent bonds with —OH groups in other material e.g. natural products like wood or wood derivative products. The melt index being ≦4 g/10 min (measured 190° C./2.16 kg) makes the activation of the reactive groups possible in film form.
  • In this context, a wood board refers to any wood panel product, plywood product, particle board, fiberboard, composite product, beam, pressed panel product or the like, formed of a number of veneers and principally of wood-based materials, in which the veneers are laid one upon the other and glued together. Further, a wood board refers to any wood product or fiber product. In this context, a veneer refers to any layer of material, typically a thin layer of material. In a preferable embodiment the wood board is plywood.
  • A wood board according to the invention can comprise veneer layers of different thickness. The thicknesses of the veneer layers can vary. The veneer layers can be arranged in the desired position, i.e. crosswise or lengthwise in the desired order.
  • In one embodiment of the invention the polyolefin film is at least partially cross-linked.
  • In one embodiment of the invention the polyolefin film comprises at least two layers which are the first and second layer, and at least the first layer is a self-adhesive layer so that it contains reactive groups with —OH groups of the wood. In one embodiment of the second layer is at least partially cross-linked. In on embodiment the first layer is at least partially cross-linked. In on e embodiment the second layer contains also reactive groups with —OH groups of the wood. In one embodiment at least one additive layer is arranged between the first and second layers. In one embodiment the film can comprises more than one additive layers e.g. 2-10 additive layers. In one embodiment the additive layer can contain functional additive. In one embodiment the additive layer can contain, for example, fire retardants, UV-stabilisers and fillers.
  • In one embodiment of the invention polyolefin is selected from group: polyethylene, polypropylene and their combinations. The polyolefin film or each layer can include additives and fillers.
  • The polyolefin film and/or the film layers can be made from petrochemical and renewable feedstock materials. In addition to bio-based polymers can be used. Preferably, the bio-based polymers have processing temperature over 180° C. or over 190° C. In one embodiment, all film layers are substantially formed of the same material. In an alternative embodiment, at least one film layer is formed of a different material than the other films layers.
  • Compatibilisers can be added to the film in order to adhere the dissimilar polymers to each other.
  • In one embodiment of the invention the reactive groups of the polyolefin film is activated at temperatures of more than 180° C., in one embodiment at temperatures of more than 190° C., during the manufacturing of the self-adhesive material. In one embodiment, the sufficient time for activation is about 0.5-3 minutes, in one embodiment about 2-3 minutes. Then the film formed contains activated functional groups capable of forming the maximum number of covalent bonds with wood.
  • In one embodiment of the invention the polyolefin film contains maleated polyolefin which contains maleic anhydride reactive groups.
  • In one embodiment of the invention the film layer contains polyethylene (PE), polypropylene (PP), maleic anhydride polyethylene (MAPE), maleic anhydride polypropylene (MAPP) or derivates thereof or their combinations. In a preferred embodiment at least one film layer contains maleic anhydride polyolefin. In one embodiment the outer film layers contain maleic anhydride polyolefin.
  • In one embodiment a laminated layer can be added onto the self-adhesive material. The laminating improves mechanical properties and scratch resistant of the self-adhesive material.
  • The polyolefin films can be adhered directly to the wood when the film is maleated at least on one side and especially when the maleated layer is treated so that its temperature during manufacturing has been over 180° C. or 190° C., so that maleic acid is converted to maleic anhydride. Maleic anhydride is very reactive with wood, forming a covalent bond with celluloses —OH groups. Without this activation, normal maleated film forms predominantly hydrogen bonds, which are much weaker than covalent chemical bonds. So we also can bond polyolefin film directly to wood without any priming and joining layers.
  • In a preferred embodiment of the invention the self-adhesive material and the wood board are joined together by means of the maleic anhydride polyolefin. The maleic anhydride polyolefin forms chemical and mechanical bonds between the polyolefin film and the veneer of the wood board.
  • In a preferred embodiment the film or the film layer which includes maleated polyolefin also contains polymer e.g. polyethylene or polypropylene. Preferably, the film layer including maleated polyolefin essentially consists of MAPE+PE or MAPP+PP.
  • In one embodiment of the invention maleated polyolefin contains maleic acid 0.3-15% by weight of the maleated polyolefin, in one embodiment 1-5% by weight of the maleated polyolefin. Preferably, the film layer is maleated to the desired degree in order to improve friction and wetting properties of the self-adhesive material.
  • In one embodiment of the invention the polyolefin film contains iso-cyanate grafted polyolefin which contains reactive groups.
  • In one embodiment of the invention the polyolefin film or layer of the film is grafted with alkoxysilane containing reactive functional groups with the polyolefin. In one embodiment the polyolefin film is grafted with hydrolysable vinyl-mono-, -di- or -tri-alkoxysilane. In one embodiment vinyl group can be replaced with isosyanate- or epoxy groups. Alkoxysilanes alcohol groups can be methyl-, ethyl-, propyl- or isopropyl-groups and silane can contain 1, 2 or 3 alkoxy-groups. The reaction with polyolefin with the vinyl or other reactive groups happens already during the polyolefin film extrusion and reaction with wood by silane-groups during or after the manufacturing of the wood board.
  • In one embodiment of the invention the polyolefin film is cross-linked by a method selected from group: silane moisture method, electron beam (EB) radiation, vinyl-silane hydrolysis and their combinations. The cross-linking can be made before the film is pressed to wooden surface or on veneer of the wood board. Alternatively the cross-linking can be made after the manufacturing the wood board into final product.
  • The thickness of the polyolefin film may vary depending on the properties of the film materials and the application of the wood board.
  • The wood board can be made using apparatuses and methods known per se. Laying the veneers one upon the other, joining them together and other typical steps in making the wood board can be performed in any manner known per se in the art.
  • The self-adhesive material can be prepared using apparatuses and methods known per se, e.g. by extrusion or by co-extrusion. Arranging the self-adhesive material of the invention on the surface or between the veneers of the wood board can be performed e.g. using the hot-pressing technique, extruder technique, film technique, roll application technique, cylinder application technique, coat and multi-layer coat application technique, all known per se, their combinations or a corresponding technique. The veneers can be joined together e.g. using the hot-pressing technique.
  • In one embodiment a catalyst is used in self-adhesive material manufacturing. The catalyst increases the frequency of the covalent bonds formed between coupling agent, e.g. maleic anhydride, and wood. Catalyst known to create such bonds and preferred is zinc anhydride. Preferably, the catalyst is hydrated zinc acetate. The catalyst cannot be extruded in the same layer as the coupling agent, e.g. maleic anhydride because it will open the maleic anhydride cyclic ring. Therefore, the catalyst can be applied to the films after extrusion and activated by heat during hot-pressing or applied directly to the wood. Alternatives are to extrude films of varying thickness (0,05-0.1 mm) such that one film contains catalyst in the outer layers and another the activated coupling agent such that the films are then during hot-pressing melt blended and reaction with the wood.
  • In one embodiment the polyolefin film can be prepared by using catalysts known per se.
  • In one embodiment of the invention the self-adhesive material is attached onto the veneers of the wood board by hot-pressing at temperatures of 120-170° C. The self-adhesive material is attached to the veneer by reactive groups. A benefit of one embodiment of this invention is that temperatures of only 120-140° C. are needed to fix the film onto the veneer surface. The hot-pressing conditions, like temperature, pressure and time, depend on the wood type, e.g. spruce or birch, and polyolefin melting temperature. It is important in order to induce plastic melt flow that the hot-pressing temperature is set to a temperature 20-50° C. above the melting temperature of the polymer.
  • According one embodiment of the invention the surface properties can be modified using fillers in the surface layer and using different degrees of maleation. High density maleation on the surface modifies its properties in the direction of polar material wetting, which also means a higher friction coefficient. This is a positive improvement especially in transport industry. This maleated surface is also excellent surface for painting especially with water based paints. Polar groups will also wet the surface at sterilization with H2O2 or HClO or other desinfective materials, used in slaughterings, meat and fish transport vehicles etc.
  • The invention makes it possible to prepare self-adhesive films. Adhesion of the self-adhesive material on wood is excellent.
  • The self-adhesive material and the wood board in accordance with the invention are suitable for various applications. The wood board can be used for applications where high wear resistance is needed, e.g. side walls of vans, trailers, horse boxes, kitchens and furniture, play ground equipment, sports equipment, flight cases and sign boards.
  • LIST OF FIGURES
  • In the following, the invention is described by means of detailed embodiment examples with reference to accompanying FIGS. 1 and 2, in which
  • FIG. 1 shows a schematic diagram of the chemical reactions, and
  • FIG. 2 shows a self-adhesive material structure according to the invention.
  • DETAILED DESCRIPTION OF THE INVENTION
  • FIG. 1 discloses a schematic diagram of the chemical reactions in the manufacturing the self-adhesive material and the wood board, e.g. plywood. To make the plywood of the invention there are many steps. First is selection of the raw materials. Then is the conversion of the maleated material from maleic acid to maleic anhydride. The self-adhesive film is made it needs to be attached to the plywood where the active maleic anhydride groups react with the hydroxide groups of the wood.
  • FIG. 2 discloses a self-adhesive material structure of the invention.
  • The self-adhesive material is formed of a film which comprises three layers: first (1), second (2) and additive (3) layers. The first layer is a bottom layer (1), second layer is a top layer (2) and additive layer (3) is arranged between the first and second layers.
  • The top film layer (2) is formed of polyolefin, e.g. polyethylene or polypropylene, and maleated polyolefin, e.g. maleic anhydride polyethylene (MAPE) or maleic anhydride polypropylene (MAPP), including additives and fillers. The top film layer can be cross-linked.
  • The bottom layer (1) is formed of MAPE or MAPP.
  • The additive layer (3) is sandwiched between the top layer (2) and the bottom layer (1). The additive layer is formed of polyethylene or polypropylene including additives, like fire retardants and UV-stabilisers, and fillers.
  • The self-adhesive material and the wood board used in the tests can be prepared following. At the first stage, the three-layer self-adhesive film is prepared of polyolefin, maleated polyolefin and additives and fillers by co-extruding. Maleated polyolefin contains maleic acid which is converted maleic anhydride at temperatures of more than 190° C. during the manufacturing of the film. The top film layer can be cross-linked by electron beam radiation at this stage. The layers of the film are joined together for forming the film. At second stage, the formed film is cut to size and is arranged between the veneers of the wood board and/or onto the wood board as a coating. The veneers of the wood board are bound together and/or the coating is attached on the surface by hot pressing, cold pressing and/or high frequency pressing. The hot pressing is made at temperatures of about 120-140° C., at pressure of about 1.2-1.9 N/mm2 and by time of 2-8 minutes. The cold pressing can follow the hot pressing. The cold pressing is made until the temperature falls below 80-100° C., at pressure of about 1.2-1.7 N/mm2 and by time of 0.5-minutes. The high frequency pressing is made by frequency of 13.10 MHz and time of about 2-5 minutes. In alternatively embodiment, the self-adhesive material can be cross-linked by radiation or silane-moisture method at this stage.
  • A wood board can be plywood, particle board, high or middle density fiberboard, or some other pressed and glued board containing wood or other plant fibers.
  • When dissimilar polymers are co-extruded a compatibiliser material is required in the self-adhesive material to join the dissimilar materials.
  • The maleated polyolefin contains normally 2-15% maleic acid of the amount of polyolefin. At extrusion at temperatures of more 180° C. the maleic acid is converted to maleic anhydride, partially or totally. The polymer film can also be cross-linkable if it in any case improves the use of the products.
  • EXAMPLE 1
  • In this example, a preparation of the polyethylene film was tested. The polyethylene film containing maleic acid was heated and activated so that maleic acid was converted to maleic anhydride during the preparation of the film. In table 1 is disclosed results of the test.
  • TABLE 1
    Treatment Treatment Maleic Maleic
    temperature time acid anhydride
    (° C.) (minutes) (%) (%)
    No treatment 3 55 45
    170 3 36 64
    180 3 20 80
    185 3 14 86
    190 3 10 90
    195 3 8 92
  • It is clear from the results of Table 1 that the maleic acid is converted mostly to maleic anhydride at temperatures of more than 180° C. for 3 minutes and therefore it can be considered that during extrusion where the polymer is in the melt for about 2-3 minutes that an extrusion temperature of >180° C. is sufficient but preferably >190° C.
  • EXAMPLE 2
  • In this example, the self-adhesive material of FIG. 2 used in the tests was prepared. The tests are carried out as following.
  • Adhesion of the coating to the plywood was measured by three different methods peel test (ISO4578, SFS-EN204), the result was the separation force as a function of coating length (25 mm). The second test was the dolly test (EN311) and the third test was the shearing test. In the case of the shearing test and peeling test the measurements could be made after soaking and boiling in addition to the dry samples. However, the dolly test could only be performed on dry samples.
  • Table 2 discloses birch plywood coating adhesive properties peeling (ISO 4578, SFS-EN204) and pull strength (dolly test, EN311). The melt index of the polyethylene is MI-0.3 g/10 min (190° C./2.16 kg). The coupling agents are Fusabond MD-353D (MAPP) and Fusabond MB-226DE (MAPE). Pressing conditions are: Temp. 130-150° C., Pressure 1.8 N/mm2 and Time 8 minutes.
  • TABLE 2
    Pull strength
    N/mm2
    Film Peel Wood
    thickness Coupling strength Strength fibre
    (mm) agent N/mm N/mm2 (%)
    2% MAPE + 0.27 Fusabond 1.4 1.7 90
    PE/PE/PE + 2% MB-226DE
    MAPE
    2% MAPE + 0.1 Fusabond 0.8 2.2 95
    PE/PE/PE MB-226DE
    2% MAPP + 0.1 Fusabond 1 1.6 85
    PP/PP/PP MD-353D
    Multi-Wall 0.28 2.1 2.2 100
  • It is clear from Table 2 that the adhesive bond to plywood is to a similar level as WISA Multiwall which is glued with polyurethane glues. The bonding of this coating is WBP exterior bonded to EN314-2/Class 3.
  • Table 3 discloses birch plywood coating adhesive properties peel strength measured for dry samples and after soaking and boiling. In all cases the melt index (MI) of the polyethylene is 0.3 (190° C./2.16 kg) except where specified as HDPE or MDPE and then MI-0.2 g/10 min (190° C./2.16 kg) or MI-0.7 g/10 min (190° C./2.16 kg) respectively is used. Hot pressing conditions are: Temp. 135-160° C., Pressure 1.7 N/mm2 and Time 3.5-8 minutes. The coupling agent used was Fusabond MB-226DE unless otherwise specified.
  • TABLE 3
    Film Peel strength
    thickness N/mm
    Film type (mm) dry soaked boiled
    2% MAPE + 0.27 1 0.7 0.5
    PE/PE/PE + 2% MAPE
    2% MAPE + 0.27 1.8 0.9 0.7
    PE/HDPE/PE + 2% MAPE
    2% MAPE + 0.27 0.9 0.6 0.2
    PE/MDPE/PE + 2% MAPE
    2% MAPE + 0.27 0.6 0.5 0.4
    PE/PE/PE + 2% MAPE
    (Fusabond 603)
    WISA Multi-Wall 0.28 2.1 1.3 1.2
  • It is clear from the results in Table 3 that the peeling test is influenced by coating stiffness and is not totally a measure of adhesive strength to wood. It is also observed that the Fusabond 603 coupling agent is less affective. However, it is clear that the coating version with HDPE co-extruded in the middle layer is at a equivalent peeling strength as WISA Multiwall for dry and soaked conditions.
  • Table 4 discloses birch plywood coating adhesion properties peeling (ISO 4578, SFS-EN204) and shear strength perpendicular to the surface (EN319) after different pretreatments (dry, soaking, boiling, EN204) for uncross-linked and cross-linked coated (0.27 mm) plywood. Hot-pressing: 7 minutes, 135° C. and 1.7 N/mm2. The coupling agent used was Fusabond MB-226DE unless otherwise stated.
  • TABLE 4
    Shearing Shearing
    strength strength
    (EN319) (EN319)
    Peel N/mm2 N/mm2
    strength Dry Boiled
    (ISO 4578) Wood Wood
    N/mm Strength failure Strength failure
    Film dry boiled N/mm2 (%) N/mm2 (%)
    2% MAPE 1.1 0.6 1.4 100 0.8 100
    2 + PE/PE/PE +
    % MAPE
    (uncrosslinked)
    2% MAPE + 1 0.6 1.03 100 0.28 100
    PE/PE/PE + %
    MAPE
    (cross-linked:
    150 KGy)
    2% MAPE + 0.6 0.4 1.2 100 0.7 80
    PE/PE/PE +
    2% MAPE
    (Fusabond 603)
    uncrosslinked
    2% MAPE + 0.6 0.4 1.13 100 0.33 100
    PE/PE/PE +
    2% MAPE
    (Fusabond 603)
    (cross-linked:
    150 KGy)
    2% MAPE + 1 0.6
    PE/HDPE/PE +
    % MAPE
    (uncrosslinked)
    2% MAPE + 0.9 0.4 1.03 100 0.32 100
    PE/HDPE/PE +
    % MAPE
    (cross-linked:
    150 KGy)
    PE Mono 0.8 39 0.04 9
    Uncross-linked
  • The results in Table 4 show that cross-linking by E-beam radiation (100-200 KGy) after hot-pressing to the plywood does not damage the wood; however it does not improve the adhesive properties. In addition to this scratch resistance was not improved. In the case of the cross-linked coatings in Table 4 the coatings were cross-linked after adhesion to the plywood; however, the films were also cross-linked before adhesion to the plywood and in those cases it was found that the cross-linking made it difficult to hot-press the coating to the plywood this is because the radiation cross-linking rendered the whole coating more heat resistant.
  • The mono film contained no MAPE it was just LDPE (MI-0.3 g/10 min, 190° C./2.16 kg). The aim of using just polyethylene to coat the surface was to show the effect of having no coupling agent. The results were acceptable for dry conditions but after boiling the wood failure was 9%. Therefore failure was in the coating. This shows the importance of forming a chemical bond.
  • Table 5 discloses birch plywood coating adhesive properties peel (ISO 4578 and SFS-EN204) and shear strength perpendicular to the surface (EN319) after different pretreatments (soaking, boiling, EN204) for low viscosity films (MI-4 g/10 min (190° C./2.16 kg) in all layers). The films could not be extruded above 170° C.
  • TABLE 5
    Melt
    index Shear strength
    (MI) (EN319)
    g/10 min Peel N/mm2
    Thickness (190° C./ strength Strength Wood
    Film (mm) 2.16 kg) N/mm N/mm2 failure
    3% Mape + 0.1 4 Not 0.83 90
    PE/3% MAPE + possible (soak) (soak)
    PE/PE + 2% MAPE
    3% Mape + 0.1 4 Not 0.06  3
    PE/3% MAPE + possible (boil) (boil)
    PE/PE + 2% MAPE
  • It was not possible to measure the peel strength because the film coating with MI-4 g/10 min (190° C./2.16 kg) polyethylene since it had penetrated into the wood so that the coating was too thin to measure. It is clear from the results in Table 5 that MI-4 g/10 min (190° C./2.16 kg) provides deeper penetration into the wood; however, owing to the coupling agent not being converted sufficiently enough into maleic anhydride during extrusion there is poor chemical adhesion to the wood (hydrogen bonding) and therefore the shear strength properties after boiling are very poor with almost no wood fibre breakage. These results show the importance of forming a durable chemical bond.
  • Table 6 discloses birch plywood coated with multi-layered dissimilar self-adhesive coating properties (scratch, boiling resistance and delamination of polypropylene or polyamide). Hot-pressing conditions are: Temp. 140, Pressure 1.7 N/mm2 and Time 8 min.
  • TABLE 6
    Hot- Delamination
    press of coating
    Film release Scratch layers
    thickness paper resistance during hot
    (mm) used N pressing
    2% Mape + PE/PA 0.1 No 8-10 No
    Polyamide laminated
    2% MAPE + PE/PE + 0.1 Yes 8-10 No
    mLLDPE + EVA/PP
    (co-extruded)
  • The scratch test is performed using an Erichsen test pen (Model 318). The test was developed by Robert Boch GmBH. Samples 100×100 mm are prepared and then the pen is applied which has forces (2-20 N). The surface is simply scratched using the pen the scratch force is increased from 2-20 N in steps of 2N. The first scratch that can be seen by the naked eye is the force that the coating can take and therefore the scratch resistance level.
  • It is clear from Table 6 there is no delamination of the polyamide or polypropylene layers during hot-pressing and there is enough scratch resistance. The main advantage of the polyamide outer layer is that there is no need for any release paper during hot-pressing. Also cost of the coating is not increased considerably as this layer can be 12 μm. Thicker polyamide layers may improve the scratch resistant properties slightly (thickness 12-20 μm).
  • Table 7 discloses birch plywood coating hardness (DIN 53505) and scratch resistance properties for different coatings compared with other coating materials for plywood. The different maleated polymers used are Fusabond MD-353D (MAPP), and Fusabond MB-226DE (MAPE).
  • TABLE 7
    Shore Scratch CaOH2
    hardness resistance Boiling
    (DIN 53505) (N) test
    2% MAPE + PE/PE/PE + 62 8-10 Pass
    2% MAPE (0.27 mm)
    2% MAPE + PE/PE/PE + 63 8-10 Coating worn
    2% MAPE (0.03 mm) away
    2% MAPP + PP/PP/PP 56 8-10 Pass
    (0.1 mm)
    Wisa multiwall 58 5-8  Pass
    (0.28 mm)
  • It can be seen from Table 7 that the scratch resistance of the self-adhesive coatings is higher than for WISA Multiwall. This is important from the point of view of where the coated plywood is used. If it is used where it is easily or frequently touched or there are sharp objects then it is important that the coating on the plywood does not scratch easily. The CaOH2 boiling test results are also very important especially if the coatings are to be used in formwork for concrete applications.
  • A self-adhesive material and a wood board according to the invention are suitable in its different embodiments for different types of applications.
  • The embodiments of the invention are not limited to the examples presented rather many variations are possible within the scope of the accompanying claims.

Claims (24)

1.-20. (canceled)
21. A self-adhesive material for a wood board, wherein the self-adhesive material is formed of polyolefin film having a melt index is ≦4 g/10 min (measured 190° C./2.16 kg), the polyolefin film contains reactive groups with —OH groups of the wood for forming self-adhesive properties, and the reactive groups of the polyolefin film is activated during the manufacturing of the self-adhesive material for forming a covalent bond with —OH groups of the wood.
22. The self-adhesive material according to claim 21, wherein the polyolefin film is at least partially cross-linked.
23. The self-adhesive material according to claim 21, wherein the reactive groups of the polyolefin film is activated at temperatures of more than 180° C. during the manufacturing of the self-adhesive material.
24. The self-adhesive material according to claim 21, wherein a catalyst is used in the manufacturing of the self-adhesive material.
25. The self-adhesive material according to claim 21, wherein the polyolefin film comprises at least two layers which are the first (1) and second layer (2), and at least the first layer (1) is a self-adhesive layer so that it contains reactive groups with —OH groups of the wood.
26. The self-adhesive material according to claim 25, wherein the second layer (2) is at least partially cross-linked.
27. The self-adhesive material according to claim 25, wherein the first layer (1) is at least partially cross-linked.
28. The self-adhesive material according to claim 25, wherein the second layer (2) contains reactive groups with —OH groups of the wood.
29. The self-adhesive material according to claim 25, wherein at least one additive layer (3) is arranged between the first (1) and second (2) layers.
30. The self-adhesive material according to claim 21, wherein polyolefin is selected from group: polyethylene, polypropylene and their combinations.
31. The self-adhesive material according to claim 21, wherein the polyolefin film contains maleated polyolefin which contains maleic anhydride reactive groups.
32. The self-adhesive material according to claim 21, wherein the polyolefin film contains iso-cyanate grafted polyolefin which contains reactive groups.
33. The self-adhesive material according to claim 21, wherein the polyolefin film or layer of the film is grafted with alkoxysilane containing reactive functional groups with the polyolefin.
34. The self-adhesive material according to claim 21, wherein the maleated polyolefin contains maleic acid 0.3-15% by weight of the maleated polyolefin.
35. The self-adhesive material according to claim 21, wherein the polyolefin film is cross-linked by a method selected from group: silane moisture method, electron beam (EB) radiation, vinyl-silane hydrolysis and their combinations.
36. The self-adhesive according to claim 25, wherein the layer of the polyolefin film contains polyethylene, polypropylene, maleic anhydride polyethylene or maleic anhydride polypropylene or their combinations.
37. A wood board, which wood board is formed so that the veneers of the wood board are joined together, wherein the wood board is manufactured by the self-adhesive material according to claim 21 so that the self-adhesive material is used as a coating onto board and/or as a glue-line material between veneers.
38. The wood board according to claim 37, wherein the coating is attached onto the wood board by covalent bonds between the coating and the —OH groups of the wood board.
39. The wood board according to claim 37, wherein the glue-line material is attached between the veneers of the wood board for gluing the veneers together and the glue-line material forms covalent bonds between the glue-line material and the —OH-groups of the veneers.
40. The wood board according to claim 37, wherein the self-adhesive material is attached onto the veneers of the wood board by hot pressing at temperatures of 120-170° C.
41. The wood board according to claim 37, wherein the wood board is selected from group: plywood, particle board, fiber board and paper board.
42. The method for manufacturing a self-adhesive material, wherein the self-adhesive material is formed of polyolefin film having a melt index is ≦4 g/10 min (measured 190° C./2.16 kg) and containing reactive groups with —OH groups for forming self-adhesive properties, and the reactive groups of the polyolefin film is activated during the manufacturing of the self-adhesive material for forming a covalent bond with —OH groups.
43. The method according to claim 42, wherein a catalyst is used in the manufacturing of the self-adhesive material.
US12/918,297 2008-02-18 2009-02-18 Self-adhesive material for wood board and wood board Abandoned US20110104485A1 (en)

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FI20085147 2008-02-18
FI20085147A FI20085147A0 (en) 2008-02-18 2008-02-18 A coating material, a coated wood product, and a method for making a coating material
FI20085152A FI20085152A0 (en) 2008-02-18 2008-02-18 Glue material for a plywood product and plywood product
FI20085152 2008-02-18
FI20085465A FI20085465A0 (en) 2008-05-16 2008-05-16 Coating material, coated wood product and process for making a coating material
FI20085465 2008-05-16
PCT/FI2009/050130 WO2009103847A1 (en) 2008-02-18 2009-02-18 Self-adhesive material for wood board and wood board

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WO2009103847A1 (en) 2009-08-27
CN101945759A (en) 2011-01-12
RU2483086C2 (en) 2013-05-27
US20160082700A1 (en) 2016-03-24
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EP2250017A4 (en) 2012-04-18
JP2011512451A (en) 2011-04-21

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