WO1999043476A1 - Wood composite products - Google Patents
Wood composite products Download PDFInfo
- Publication number
- WO1999043476A1 WO1999043476A1 PCT/CA1999/000088 CA9900088W WO9943476A1 WO 1999043476 A1 WO1999043476 A1 WO 1999043476A1 CA 9900088 W CA9900088 W CA 9900088W WO 9943476 A1 WO9943476 A1 WO 9943476A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- zinc borate
- producing
- dispersion
- wax
- composite wood
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N1/00—Pretreatment of moulding material
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L97/00—Compositions of lignin-containing materials
- C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
Definitions
- the present invention relates to consolidated composite wood products, more particularly, the present invention relates to a method of producing a consolidated wood product incorporating a biological degradation protection additive.
- Composite wood products are generally formed from wood strands or the like bonded together by a suitable resin such as phenol formaldehyde (PF) or isocynate resins (MDI).
- PF phenol formaldehyde
- MDI isocynate resins
- the strands may be random or parallel oriented relative to one another and in some cases, the composite product is made from layers with different orientation or strands in adjacent layers.
- the present invention relates to a method of producing a composite wood product comprising forming a sprayable aqueous dispersion of zinc borate particles having a zinc borate content in the range of 20-75% by weight, applying said dispersion on surfaces of wood strands in the amount of between 5 and 25 grams of zinc borate per kg. of wood strands, also applying binder to said wood strands, forming a lay-up of said wood strands with said dispersion of zinc borate applied and said binder applied and then consolidating said lay-up of said wood strands under heat and pressure to form said composite product.
- said zinc borate is present in said dispersion in the amount of between 30-70% by weight of said dispersion.
- said dispersion is a wax, zinc borate dispersion containing wax and zinc borate in weight ratios of 1/1 to 1/2.
- said zinc borate dispersion is mixed with a wax suspension to form said zinc borate dispersion containing wax dispersion.
- said wax will be present in an amount of 5 parts wax solids to 5 to 10 parts zinc borate.
- said wax comprises a slack wax.
- said zinc particles have median particle sizes of 2 to 12 ⁇ m.
- said zinc borate dispersion will contain an effective amount of thickener, defoamer disperser and surfactant.
- said thickener will be present in the amount of less than 2% by weight.
- said thickener will be present in the amount of less than 0.5% by weight.
- said defoamer will be present in the amount of between 0.5 to 0.1 % by weight.
- said disperser will be present in the amount of less than 5% by weight.
- said disperser will be present in the amount of less than 1% by weight.
- said surfactant will be present in the amount of less than 2% by weight. Preferably, said surfactant will be present in the amount of less than 0.5% by weight.
- FIG. 1 is a flow diagram of the process of the present invention. Description of the Preferred Embodiments
- wood strands which may be in the form of wafers, strips of wood, particles of wood, etc. as normally used in the manufacture of wood composites, such as strand board, wafer board, oriented strand board, medium density fiber board, or products such as those sold under the trademarks TimberStrand ® and
- Parallam ® by Trus Joist MacMillan are delivered to the system as indicated at 10. These strands are then fed in the case of conventional strand or wafer board production to a blending operation indicated at 12 wherein the required amount of binder is applied to the strands and when practising the present invention the strands are coated with the desired amount of a dispersion containing zinc borate (such as those sold under the tradenames Firebrake, Borgard ZB or Composibor sold by US Borax). Sufficient zinc borate is applied to the strands to provide the desired degree of protection to the resultant composite product. The so coated strands are then formed into a mat as indicated at 14 and the mat is consolidated to form the composite wood product as indicated at 16.
- a dispersion containing zinc borate such as those sold under the tradenames Firebrake, Borgard ZB or Composibor sold by US Borax.
- a wax emulsion is also applied to the strands.
- the wax preferably forms a significant part of the zinc borate dispersion as will be discussed below.
- the emulsion is applied first particularly with
- MDI type resins to limit the contact of the resin by water. Any suitable binder may be applied in 12.
- the binders used to produce composite wood products and bind the strands or the like together are phenol formaldehyde (PF) type binders and isocynate (MDI) type resin binders and may also be useful with melamine and urea formaldehyde users.
- PF phenol formaldehyde
- MDI isocynate
- the amounts of such binders applied need not be changed significantly relative to the amounts conventionally used when they are used in combination with the present invention wherein a zinc borate emulsion is also applied to the strands.
- the process for making the composite wood product when practicing the present invention is essentially the same in all steps except in place of a powdered zinc borate being applied directly to the wood strands, Applicant forms a sprayable aqueous emulsion of the zinc borate and applies the zinc borate emulsion to the strands prior to consolidation preferable at the same time as the resin component of the composite is applied.
- Wax is generally added as a separate step or with a binder.
- the wax may be made part of the zinc borate emulsion and applied to the strands simultaneously with the zinc borate i.e. in the same emulsion.
- the preferred embodiment incorporates wax in the zinc borate dispersion.
- the zinc borate emulsion be reasonably stable over time at least until applied to the strands (with a reasonable margin of safety) particularly if the process requires premixing or premaking of the aqueous zinc emulsion well before its application in step 12.
- the zinc borate emulsions of the present invention include water, thickeners, defoamers or anti-foaming agents, dispersers and surfactants.
- the zinc borate dispersion are applied to provide between about 5 and 25 grams of zinc borate for each kilogram of wood.
- thickeners such as suitable cellulose derivatives, water-swellable acrylics, clays, amorphous silica are used as thickeners in the zinc borate emulsion used with the present invention.
- the cellulose type of thickeners such as hydroxy ethyl cellulose such as that sold by Union Carbide under the trademark CellosizeTM or under the trademark NatrosolTM by Aqualon are preferred.
- these thickeners are present in the emulsions in the amounts of up to 2%. based on the weight of the emulsion and preferably less than 0.5% with the amount normally used being about 0.25% based on the weight of the emulsion.
- Defoamers or anti-foaming agents are generally present in the range of up to about 1%) of the weight of suspension. Preferably, not less than 0.1%> with the normal usage being approximately 0.25% based on the weight of the dispersion.
- Suitable anti- foaming agents used in the present invention include, antifoam HL-52 (Harcros Chemicals), BYK031 (BYK Chemie), Foamaster VL (Henkel), Dehydran 1293 (Henkel) and Nopko NXZ (Henkel).
- Some polycarboxylic acid salts form dispersers suitable for use with the present invention. Generally, the disperser will be present in amounts up to 5%, preferably less than 1% and will normally be applied in a typical formulation at about 0.5% of the weight of the suspension.
- Suitable commercially available dispersers compatible with other materials in the dispersion include Tamol 681 and Tamol 850, both available from Rohm & Haas.
- Surfactant or wetting agents suitable for use with the present invention include suitable water soluble ethoxylated fluorol compounds (e.g. zonyl FSM by Dupont Inc.), ethoxylated alkyl phenols and alkylaryl polyethers.
- the preferred surfactant or wetting agent found todate is a monylphenol ethoxylate sold under the tradename Igepal CO 630 by Stepan.
- wetting agents are generally present in the amounts of up to 2%, preferably less than 0.5% with a typical suspension generally containing about 0.25% by weight of surfactant.
- Suitable commercially available wetting agents include Igepal Co630 (Stepan), Polytergent B-300 (Harcros Chemical) and Triton X-100 (Union Carbide).
- wax may be used as a significant element in the zinc borate dispersion.
- wax is applied to the strands during the manufacture of composite wood products.
- Suitable wax emulsion include Casco wax EW101 (Borden). When used, the wax will generally be present on a weight ratio of wax to zinc borate of about 1/1 to about 1/2.
- the wax precipitates and encapsulates the zinc borate particles and helps to bind the zinc borate particles to the wood strands. It has been found that the combination of a zinc borate dispersion with a wax emulsion in the proper amounts, produces a surprisingly stable form of zinc borate dispersion.
- a zinc borate dispersion which preferably contain wax emulsion
- one first forms a zinc borate dispersion by mixing under high shear the water, thickener, disperser and deformer and then add further water followed by slow addition of zinc borate as indicated at 9 in Figure 1.
- about half of the water is initially used in premixing and the other half is added at the time the zinc borate is added.
- Zinc borate is added slowly to reduce the tendency of lumping and thickening.
- a surfactant is added after the zinc borate dispersion has been made. It is very much preferred to use the zinc borate dispersion in combination with a wax emulsion.
- the zinc borate and wax emulsion are mixed to generate the final zinc borate-wax dispersion as indicated at 9 for application to the strands as indicated at 12.
- the dispersion and emulsion should be mixed slowly and gently to prevent breaking of the wax emulsion.
- the amount of wax emulsion or wax solids basis in the final zinc borate dispersion should be sufficient to stabilize the zinc borate dispersion. This generally requires a significant amount of wax in the order of at least about 50% wax solids based on the zinc borate solids in the dispersion.
- the total amount of wax suspension mixed with the zinc borate dispersion will vary depending on the composition of the actual wax being used. It has been found that a ratio 1 to 2 parts by weight of solid wax to 7 to 10 parts by weight of zinc borax was effective to significantly increase shelf life over the resultant zinc borax dispersion.
- the pH of zinc borate or zinc borate- wax dispersion will not exceed a pH of 8.5.
- a typical dispersion formulation containing wax is given in Table I.
- Anti-foaming Agent (Antifoam HL-52) 0.025
- zinc borate will have a fine particle size, i.e. a median particle size in the range of about 2 to 12 ⁇ m.
- the maximum size of the particles is chosen to ensure that a significant number of the particles do not precipitate out of the emulsion and the minimum size is chosen to ensure that the viscosity of the emulsion is not unduly increased.
- a borax having a median size of about 8 ⁇ m.
- concentration of the zinc borate in the dispersion be sufficiently high so that too much water is not added to the composite product as excess water will interfere with the development of proper bonding during consolidation.
- the zinc borate dispersion is preferably stable over time and it does not separate or thicken before application to the wood strands and should be capable of being sprayed, for example, using disk dispersing equipment conventionally used in the industry for application of resin and which has been found to effectively and with sufficient uniformity distribute the suspension over the strands.
- the zinc borate suspension dispersion is suitable for application by such equipment but it generally is also suitable or may be made suitable for application by other equipment particularly spraying equipment, for example, airless sprayers).
- dispersions of the present invention is of particular advantage in system wherein the blending stages are operated under negative pressure to prevent loss of materials.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000533260A JP2002504443A (en) | 1998-02-26 | 1999-02-02 | Wood composite products |
NZ506281A NZ506281A (en) | 1998-02-26 | 1999-02-02 | Application of an aqueous dispersion of zinc borate in the preservation of wood composite products |
AU24055/99A AU741151B2 (en) | 1998-02-26 | 1999-02-02 | Composite products |
EP99903555A EP1058607B1 (en) | 1998-02-26 | 1999-02-02 | Wood composite products |
CA002320297A CA2320297C (en) | 1998-02-26 | 1999-02-02 | Composite products |
DE69932322T DE69932322T2 (en) | 1998-02-26 | 1999-02-02 | WOOD COMPOSITE MATERIALS |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/030,920 US5972266A (en) | 1998-02-26 | 1998-02-26 | Composite products |
US09/030,920 | 1998-02-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999043476A1 true WO1999043476A1 (en) | 1999-09-02 |
Family
ID=21856708
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CA1999/000088 WO1999043476A1 (en) | 1998-02-26 | 1999-02-02 | Wood composite products |
Country Status (10)
Country | Link |
---|---|
US (1) | US5972266A (en) |
EP (1) | EP1058607B1 (en) |
JP (1) | JP2002504443A (en) |
CN (1) | CN1102880C (en) |
AT (1) | ATE332789T1 (en) |
AU (1) | AU741151B2 (en) |
CA (1) | CA2320297C (en) |
DE (1) | DE69932322T2 (en) |
NZ (1) | NZ506281A (en) |
WO (1) | WO1999043476A1 (en) |
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EP1357794A2 (en) * | 2001-01-05 | 2003-11-05 | Kop-Coat, Inc. | Synergistici combination of fungicides to protect wood and wood-based products from fungal decay, mold and mildew damage |
US7160606B2 (en) | 2001-09-17 | 2007-01-09 | Genics Inc. | Method of treating building materials with boron and building materials |
US7223415B1 (en) | 2002-10-07 | 2007-05-29 | Nisus Corporation | Weather resistant granular bait with synergistic broad spectrum attractant system |
US8597419B2 (en) | 2007-01-17 | 2013-12-03 | Genics Inc. | Preservative compositions for wood and like materials |
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DE19718771A1 (en) * | 1997-05-03 | 1998-11-05 | Dieffenbacher Gmbh Maschf | Procedure for manufacture of derived timber product board, such as chip board and fibre board |
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US7163974B2 (en) * | 2000-05-14 | 2007-01-16 | U.S. Borax Inc. | Lignocellulosic composites |
US20010037035A1 (en) * | 2000-05-24 | 2001-11-01 | Kevin Kutcel | Method for preparing polyborate compounds and uses for same |
US7449130B2 (en) * | 2000-07-17 | 2008-11-11 | U.S. Borax Inc. | Mixed solubility borate preservative |
US20020182431A1 (en) * | 2001-04-23 | 2002-12-05 | Hatton Howard Wayne | Calcium borate treated wood composite |
US20030221775A1 (en) * | 2002-05-31 | 2003-12-04 | Martin Feng | Method for producing wood composite products with phenolic resins and borate-treated wood materials |
US7883651B1 (en) | 2002-11-18 | 2011-02-08 | Lords Additives LLC | Lignoellulosic, borate filled, thermoplastic composites |
US7056919B2 (en) * | 2003-01-24 | 2006-06-06 | Kopcoat, Inc. | Synergistic combination of fungicides to protect wood and wood-based products and wood treated by such combination as well as methods of making the same |
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US20060257578A1 (en) * | 2003-04-09 | 2006-11-16 | Jun Zhang | Micronized wood preservative formulations comprising boron compounds |
US20050249812A1 (en) * | 2004-04-27 | 2005-11-10 | Leach Robert M | Micronized organic preservative formulations |
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US20070131136A1 (en) * | 2004-04-27 | 2007-06-14 | Osmose, Inc. | Composition And Process For Coloring Wood |
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US20050252408A1 (en) | 2004-05-17 | 2005-11-17 | Richardson H W | Particulate wood preservative and method for producing same |
US7238654B2 (en) * | 2004-05-17 | 2007-07-03 | Phibro-Tech, Inc. | Compatibilizing surfactant useful with slurries of copper particles |
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US8075735B2 (en) * | 2004-09-22 | 2011-12-13 | Timtek, Llc | System and method for the separation of bast fibers |
AU2005291956A1 (en) | 2004-09-30 | 2006-04-13 | Jeld-Wen, Inc | Treatment of wood for the production of building structures and other wood products |
US20060112850A1 (en) | 2004-10-14 | 2006-06-01 | Jun Zhang | Micronized wood preservative formulations in organic carriers |
US20060086284A1 (en) * | 2004-10-14 | 2006-04-27 | Jun Zhang | Non-alkaline micronized wood preservative formulations |
US20060128886A1 (en) * | 2004-12-14 | 2006-06-15 | Winterowd Jack G | Low-nitrogen content phenol-formaldehyde resin |
US20060276468A1 (en) * | 2005-05-12 | 2006-12-07 | Blow Derek P | Wood preservative formulations comprising Imazalil |
US7655281B2 (en) * | 2005-05-24 | 2010-02-02 | Kop-Coat, Inc. | Method of protecting wood through enhanced penetration of wood preservatives and related solution |
US20070003747A1 (en) * | 2005-06-30 | 2007-01-04 | Gnatowski Marek J | Composite wood product, methods for manufacturing the same and methods for determining organic biocide concentration in a composite wood product |
US20070021385A1 (en) * | 2005-07-21 | 2007-01-25 | Jun Zhang | Compositions and methods for wood preservation |
CA2631424C (en) * | 2005-11-29 | 2015-06-09 | Timtek Australia Pty, Ltd. | System and method for the preservative treatment of engineered wood products |
DE102006003699B3 (en) * | 2006-01-26 | 2007-10-11 | Glunz Ag | Wood fiber board with mold protection for roof and wall construction and method for its production |
US8662121B2 (en) * | 2006-03-30 | 2014-03-04 | Weyerhaeuser Nr Company | Method for reducing warp potential within lumber derived from a raw material |
US7851021B2 (en) * | 2006-08-30 | 2010-12-14 | Louisiana-Pacific Corporation | Treated wet process hardboard |
US7632567B1 (en) | 2006-08-31 | 2009-12-15 | Osmose, Inc. | Micronized wood preservative formulations comprising copper and zinc |
US7678309B2 (en) * | 2006-11-28 | 2010-03-16 | Timtek, Llc | System and method for the preservative treatment of engineered wood products |
US7816343B2 (en) * | 2007-03-08 | 2010-10-19 | Hwd Acquisition, Inc. | Wood preservative composition |
US8058193B2 (en) | 2008-12-11 | 2011-11-15 | Jeld-Wen, Inc. | Thin-layer lignocellulose composites and methods of making the same |
US20090143334A1 (en) * | 2009-02-05 | 2009-06-04 | Ward Hans A | Method of Protecting Wood Through Enhanced Penetration of Wood Preservatives and a Related Solution |
US20110155315A1 (en) * | 2009-12-24 | 2011-06-30 | Ali'i Pacific LLC | Preservative-treated i-joist and components thereof |
US9125398B2 (en) | 2011-04-05 | 2015-09-08 | Kop-Coat, Inc. | Method of employing enhanced penetration of wood preservatives to protect wood and a related solution |
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US9931761B2 (en) | 2013-07-25 | 2018-04-03 | Timtek, Llc | Steam pressing apparatuses, systems, and methods |
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US5246652A (en) * | 1992-06-05 | 1993-09-21 | Forintek Canada Corp. | Method of making wood composites treated with soluble boron compounds |
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US4241133A (en) * | 1979-04-02 | 1980-12-23 | Board Of Control Of Michigan Technological University | Structural members of composite wood material and process for making same |
US4818779A (en) * | 1987-11-25 | 1989-04-04 | Dow Corning Corporation | Poly(vinyl acetate) emulsion adhesives containing an alkoxysilane |
US5763338A (en) * | 1996-03-22 | 1998-06-09 | Forintek Canada Corporation | High level loading of borate into lignocellulosic-based composites |
-
1998
- 1998-02-26 US US09/030,920 patent/US5972266A/en not_active Expired - Lifetime
-
1999
- 1999-02-02 NZ NZ506281A patent/NZ506281A/en unknown
- 1999-02-02 DE DE69932322T patent/DE69932322T2/en not_active Expired - Fee Related
- 1999-02-02 WO PCT/CA1999/000088 patent/WO1999043476A1/en active IP Right Grant
- 1999-02-02 EP EP99903555A patent/EP1058607B1/en not_active Expired - Lifetime
- 1999-02-02 AT AT99903555T patent/ATE332789T1/en not_active IP Right Cessation
- 1999-02-02 CN CN99803355A patent/CN1102880C/en not_active Expired - Fee Related
- 1999-02-02 JP JP2000533260A patent/JP2002504443A/en active Pending
- 1999-02-02 CA CA002320297A patent/CA2320297C/en not_active Expired - Lifetime
- 1999-02-02 AU AU24055/99A patent/AU741151B2/en not_active Ceased
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EP0264538A1 (en) * | 1986-10-01 | 1988-04-27 | Rütgerswerke Aktiengesellschaft | Process for preparing boric acid suspensions |
US4879083A (en) * | 1988-06-17 | 1989-11-07 | Macmillan Bloedel Limited | Chemically treated wood particle board |
US5246652A (en) * | 1992-06-05 | 1993-09-21 | Forintek Canada Corp. | Method of making wood composites treated with soluble boron compounds |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1357794A2 (en) * | 2001-01-05 | 2003-11-05 | Kop-Coat, Inc. | Synergistici combination of fungicides to protect wood and wood-based products from fungal decay, mold and mildew damage |
EP1357794A4 (en) * | 2001-01-05 | 2004-02-11 | Kop Coat Inc | Synergistici combination of fungicides to protect wood and wood-based products from fungal decay, mold and mildew damage |
US7160606B2 (en) | 2001-09-17 | 2007-01-09 | Genics Inc. | Method of treating building materials with boron and building materials |
US7223415B1 (en) | 2002-10-07 | 2007-05-29 | Nisus Corporation | Weather resistant granular bait with synergistic broad spectrum attractant system |
US7264827B1 (en) | 2002-10-07 | 2007-09-04 | Nisus Corporation | Weather resistant granular bait with synergistic broad spectrum attractant, system |
US8597419B2 (en) | 2007-01-17 | 2013-12-03 | Genics Inc. | Preservative compositions for wood and like materials |
Also Published As
Publication number | Publication date |
---|---|
AU741151B2 (en) | 2001-11-22 |
CA2320297C (en) | 2007-04-17 |
EP1058607A1 (en) | 2000-12-13 |
CN1291932A (en) | 2001-04-18 |
EP1058607B1 (en) | 2006-07-12 |
AU2405599A (en) | 1999-09-15 |
CN1102880C (en) | 2003-03-12 |
ATE332789T1 (en) | 2006-08-15 |
CA2320297A1 (en) | 1999-09-02 |
NZ506281A (en) | 2002-12-20 |
US5972266A (en) | 1999-10-26 |
DE69932322D1 (en) | 2006-08-24 |
JP2002504443A (en) | 2002-02-12 |
DE69932322T2 (en) | 2007-07-19 |
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