CA1141097A - Manufacture of dimensionally stable polyurethane foams from storage-stable prepolymers containing isocyanate groups and tertiary amino groups - Google Patents
Manufacture of dimensionally stable polyurethane foams from storage-stable prepolymers containing isocyanate groups and tertiary amino groupsInfo
- Publication number
- CA1141097A CA1141097A CA000324387A CA324387A CA1141097A CA 1141097 A CA1141097 A CA 1141097A CA 000324387 A CA000324387 A CA 000324387A CA 324387 A CA324387 A CA 324387A CA 1141097 A CA1141097 A CA 1141097A
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- polyether
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
- C08J9/149—Mixtures of blowing agents covered by more than one of the groups C08J9/141 - C08J9/143
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/46—Polycondensates having carboxylic or carbonic ester groups in the main chain having heteroatoms other than oxygen
- C08G18/4615—Polycondensates having carboxylic or carbonic ester groups in the main chain having heteroatoms other than oxygen containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/50—Polyethers having heteroatoms other than oxygen
- C08G18/5021—Polyethers having heteroatoms other than oxygen having nitrogen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2101/00—Manufacture of cellular products
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2150/00—Compositions for coatings
- C08G2150/60—Compositions for foaming; Foamed or intumescent coatings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2170/00—Compositions for adhesives
- C08G2170/60—Compositions for foaming; Foamed or intumescent adhesives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2190/00—Compositions for sealing or packing joints
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
- C08J2375/06—Polyurethanes from polyesters
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S521/00—Synthetic resins or natural rubbers -- part of the class 520 series
- Y10S521/917—Specialized mixing apparatus utilized in cell forming process
Abstract
O.Z. 0050/032961 Abstract of the disclosure: A process for the manufacture of dimensionally stable polyurethane foams by releasing, and curing by interaction with the atmosphere, a mixture, which is under pressure, of prepolymers, containing iso-cyanate groups, and blowing agents, with or without assistants and additives, wherein the prepolymers, containing isocyanate groups, are obtained by reaction of organic polyisocyanates with difunctional to octafunctional polyester-polyols and/or.
polyether-polyols, containing chemically bonded tertiary amino groups in the polymer chain, or, preferably, with mixtures of such polyester-polyols and/or polyether-polyols and nitrogen-free polyester-polyols and/or polyether-polyols.
polyether-polyols, containing chemically bonded tertiary amino groups in the polymer chain, or, preferably, with mixtures of such polyester-polyols and/or polyether-polyols and nitrogen-free polyester-polyols and/or polyether-polyols.
Description
~ ,Z. 0050/0329~1 MANUFACTURE OF DIMENSIONALLY ~TABLE POLYURETHANE FOAMS FROM
STORAGE-STABLE PREPOLYMERS CONTAINING ISOCYANATE GROUPS AND
TERTIARY AMINO GROUPS
The present.i~vention relates to a process ~or the manu~acture of dimensionall~ stable polyurethane foams by releasing a storage-stable mixture, which is under pressure, o~ prepolymers, containing isocyanate groups, and blowing agents, with or ~ithout assistants and additives, and allow-ing it to cure by reaction with the atmosphere, T~herein the prepQlymers containing isocyanate groups are obtained by reaction of organic polyisocyanates with di~unctional to octafunctional polyester-polyols and/or polyether-polyols, containing chemically bonded tertiary amino groups in the polymer chain, or9 preferably. t~ith mixtures of such poly-ester-polyols and/or polyether-polyols and nitrogen-free polyester-polyols and/or polyether-polyols in certain ratios.
Polyurethane foams are usually prepared by the pre-polymer ~rocess and preferably oy the one-shot proces For this purpose, the reactants, for example prepolymers containing isocyanate groups, or polyisocyanates, and poly-ols, together with blowing agents and catal~sts and with or without assistants and additives, are ~ed in metered amounts, separately or in the form of mixtures, to a mixing device, ~or example a mixing head, thoroughly mixed therein and poured, from dispensing devices, into molds or into cavities which are to be filled, in which the mixture foams up and cures .
It is also kno~n to manuI~acture poly~rethane foams from two-component systems, where component A preferably contains the organic polyol, the catalys~, blowing agents .~
STORAGE-STABLE PREPOLYMERS CONTAINING ISOCYANATE GROUPS AND
TERTIARY AMINO GROUPS
The present.i~vention relates to a process ~or the manu~acture of dimensionall~ stable polyurethane foams by releasing a storage-stable mixture, which is under pressure, o~ prepolymers, containing isocyanate groups, and blowing agents, with or ~ithout assistants and additives, and allow-ing it to cure by reaction with the atmosphere, T~herein the prepQlymers containing isocyanate groups are obtained by reaction of organic polyisocyanates with di~unctional to octafunctional polyester-polyols and/or polyether-polyols, containing chemically bonded tertiary amino groups in the polymer chain, or9 preferably. t~ith mixtures of such poly-ester-polyols and/or polyether-polyols and nitrogen-free polyester-polyols and/or polyether-polyols in certain ratios.
Polyurethane foams are usually prepared by the pre-polymer ~rocess and preferably oy the one-shot proces For this purpose, the reactants, for example prepolymers containing isocyanate groups, or polyisocyanates, and poly-ols, together with blowing agents and catal~sts and with or without assistants and additives, are ~ed in metered amounts, separately or in the form of mixtures, to a mixing device, ~or example a mixing head, thoroughly mixed therein and poured, from dispensing devices, into molds or into cavities which are to be filled, in which the mixture foams up and cures .
It is also kno~n to manuI~acture poly~rethane foams from two-component systems, where component A preferably contains the organic polyol, the catalys~, blowing agents .~
- 2 - O.Z. 00~0/032961 and additives and component B consists of polyisocyanates, with or without further assistants. The two components are separatel~J stored in multi-compartment containers~ pre-ferably two-compartment containers. Be~ore processing, ~ the partition between the two compartments is destroyed and components A and B are miYed, after which the foamable mix-ture is processed.
According to disclosures of British Patents 1,086,609 and 1,175,717, the components A and B can be sep-arately introduced into aerosol cans, stored, mixed oymeans of a su.itable device and discharged from the can as a foamable mixture. A disadvantage o~ the process des-cribed is that it uses an expensive multi-compartment container with a mixing device, and that the entire contents o~ the can must be processed at once, since the mixture of components A and ~ cannot be stored.
U.S. Patent 3.830,750 also describes the manu~ac~ure of foamable polyurethane mix~ures, but the mixture of cur-able polymer or polymer intermediate and an inert blowing agent which is soluble in the polymer is accommodated in a . container ~rom which any desired amounts o~ ~oam, within ~he limit of ~he capacity of the container, can be dispensed.
Though the one-component foam allows conuenient and advan-~ tageous processing - for example it can be discharged from the aerosol can without weighing and mixing - this process also has certain disadvantages. For example, the poly-urethane mixture described in U.S. Patent 3,830,760 has onl-~
a limited shelf li~e, the viscosity of the mix~ure rises relatively rapidly, and the contents o~ the can solidily on , .. . . . .
prolonged storage. It is a further disadvantage that the foamed polyurethane mixture reacts with the atmosphere, and cures, relatively slowly, so that the polyurethane foam may undergo post-expansion. This can lead to distortion of articles which have been filled with foam, for example door Erames or window frames.
It ts an object of tlle present inv~ntion to provide dLmensionally stable polyurethane foams obtained from a ~'oamable polyurethane mixture wh:Lch has a shel lie o at least 18 months at room temperature, can be stored in a single container and can be foamed by releasing the mixture.
We have found that this object is achieved by a improved process for the manufacture o dimensionally stable p~lyurethane oa~ o the type comprising releasing the pressure on ~n~xture of prepolymers which is held in a one-compartment container under greater than atmospheric pressure and thereater curing this foam by interaction with the atmosphere. This process is improved in that use is made therein of a mixture of prepolymers which has a shelf life of at least 60 days at 60~C., this prepolymers containing isocyanate groups and being admixed with blowiny agents, wherein the prepolymers used, having an NCO content of from 5 to 25 percent by weight, based on the weight of the prepolymer are prepared by the reaction of a mixture of diphenylmethane-diisocyanates and polyphenyl-polymethylene-polyisocyanates with trifunctional or tetrafunc-tional polyols having a hydroxyl number of from 40 to 500 and a molecular weight of from 500 to 5000, and containing chemically bonded tertiary amino groups in the polymer chain, which polyols are selected from the group consisting of poly-esterpolyols, polyether-polyols and mixtures thereof, or by reaction of mixtures of such polyols with nitrogen-free polyester-polyols and/or polyether-polyols.
ilL4~
The reaction, according to the invention, of the polyfunctional nitrogen-containing polyester-polyols and/or polyether-polyols or, preferab~ly, of the mixtures of poly-functional nitrogen-containing and nitrogen-free polyester-, /
/
. .
-3a-~` -~ - ~
_ 4 _ O.Z 0050/032961 polyols and/or polyether-polyols, with organic polyisocyan-ates gives prepolymers containing isocyanate groups "~hich after foaming react rapidly with the atmosphere and cure to give dimensionally stable polyurethane foams.
Since, according to the invention, the foamable mix-tures do ~ot contain any conventional lo~ molecular weight monomeric polyurethane cataiysts, for example catalysts with molecular weights of less than 300 , such as tertiary amines, salts of or~anic acids, organic tin compounds and the like, the mixtures have an extremely long shelf life, ie. of more than 18 months, at room temperature.
It is a;further advantage that blowing agents which can be used are not only fluorochloromethanes, such as mono-fluorotrichloromethane, di~luoromonochloromethane and di fluorodichloromethane and their mixtures, but also hydro-carbons which do not pollute the environment; preferably, mixtures o~ fluorochloromethanes and hydrocarbons are employed.
As has already been explained, the prepolymers con-taining isocyanate groups, ~hich have an NC0 content of from 5 to 25 per cent by weight, preferably from 10 to 20 per cent by weight, based on the weight of the prepolymer, are pre-pared by reaction of preferably aromatic polyisocyanates with the polyols, or polyol mixtures, containing tert.-amino groups, according to the invention.
Exampies of aromatic polyisocyanates are mixtures of toluylene diisocyanates, such as 2,4- and/or 2,6-toluylene _ 5 _ o.Z~ 0050/03296l diisocyanate and diphenylmethane-diisocyanate3 and polyohen~l-polymethylene-polyiisocyanates (crude MDI). Preferably, a mi.Yt-lre of polyphenyl-polymethylene polyisocyanates and diphenylmethane diiso-cyanates (crudel~DI), containing from 90 to 40 per cent by wei~ht, preferably from ~0 to 50 per cent by weight, based on the total weight of the mixture, of diphenylmethane diisocyanate isomers, is used.
m e nitrogen-containing polyols used are di~`unctional to octa~unctional, preferably trifunctional or tetra-functional, polyester-polyols and/or, preferably, polyether-polyols, which have hydroxyl numbers of from 40 to 500, preferably from 40 to 200, and which contain at least one, pre~erably from 1 to 6, chemically bonded tertiary amino groups in the pol~J~er chain. Suitable nitrogen-contain-ing polyester-polyols which have molecular weights o~ from 500 to 5,000, preferably from 1,000 to 4,000, can be pre-pared, for example, from polycarboxylic acids,~preferably dicarboxylic acids, and dialkanolamines and/or trialkanol--amines, eg. diisopropanolamine and/or triisopropanolamine, which may or may not be mixed with polyhydric alcohols, or from polycarboxylic acids and mixtures of polyamines, eg. ethylenediamine, diethylenetriamine or N-methyletkylene-^triamine, and polyhydric alcohols. Examples of poly-- carboxylic acids are glutaric acid, sebacic acid, phthalic acid, isophthalic acid, terephthalic acid and ? preferably, -~ succinic acid and adipic acid. Examples of polyhvdric - ~ 6 - O.Z. 00~0/0329~1 alcohols are ethylene glycol, 1,3- and 1,2-propanediol, 1,4-butanediol, 1,6-hexanediol, diethylene glycol, di-propylene glycol, glycerol, trimethylolpropane and penta-erythritol.
Pre~erably, however, nitrogen-containing polyether-pol~ols having molecular wei~hts o~ ~rom 500 to 5,000, pre-~erably ~rom 1,000 to 4,000, are used. These can be prepared by conventional methods from one or more alkylene oxides, where alkylene is o~ 2 to 4 carbon atoms~ and a starter molecule ~hich contains an amino group and possesses from 2 to 8, pre~erably ~ or 4, active hydrogen atoms.
Examples o~ suitable alkylene oxides are 1,3-propylene oxide, 1,2- and 2,3-~utylene o~ide, styrene oxide and, pre~erably, ethylene oxide and 1,2-propylene oxide. The alkylene oxides may be used individually, in alternating succession, or ~s mixtures. Examples o~ suitable starter molecules containin~ amino groups are ammonia, hydrazine, mo'noalkyl-hydrazines and dialkylhydrazines, where alXyl is of 1 to 6 carbon atoms, guanidine, substituted guanidines, diamines, N-monoalkyl-, N,N-dialkyl- and N,N'-dialkyl-diamines, where alkyl is of 1 to 6 carbon atoms, such as ethylenediamine, and 1,3-propylenediamine, butylenediamine, hexamethy_ lenediamine, 2,4- and 2,6-toluylenediamineJ and 4,4'-, 2,4'- and 2,2'-diaminodiphenylmethane, and aminoalcohols, eg. monoethanolamine, diethanolamine and triethanolamine.
Pre~erred starter molecules containing amino groups are - triethanolamine, alkylenediamines, dialkylenetriamines, trialkylenetetramines and low molecular weight polyethylene-~7 ~
~ 7 - o.z. 0050~032961 diamines.
In another embodIme~t of the process, nitrogen-. containing polyether-polyols can be prepared ~rom nitroger~-free starter molecules, alkylene oxides and, ~or example, dibutylamino~lycldol, so that the nitrogen is not in the main polyrner chain but in the side chain.
The di~unctional to octa~unctional polyester-polyols and polyether-polyols, containing tertiary amino groups~ may be used as such or as mixtures.
Pre~erably, however, t~e polyols used are mixtures o~ the above difunctional to octafunctional polyester polyols and/or polyether-polyols, con~aining tertiary amino groups, with nitrogen-free difunctional to octafunctional, prefer-ably tetra~unctional and trifunctional, polyester-polyols and/or polyether-polyols having hydroxyl numbers of from ~0 to 500, preferably from 200 to 400. Suitable nitrogen-free polyester-polyols ~ave molecular weights of from 400 to 4,000, preferably from 500 to 2,000, and can be prepared, for example, from the above polycarboxylic acids, preferably dicarboxylic acids, and polyhydric alcohols, ~referably diols.
~ ~ Preferably, however, conventional nitrogen-free polyether-polyols having molecular weights of from 400 to 4,000, preferably from 400 to 2,000, are used in the polyol mixture according to the invention. The polyether-polyols are prepared by conventional methods from one or more of the above alkylene oxides and a nitrogen-free starter molecule. Examples o~ suitable nitrogen-lree - 8 - o.z. 0050/032961 starter molecul~s are ~rater, phosphoric acid, polycarboxylic acids, especially dicarboxylic acids, such as adipic acid, succinic acid, phthalic acid and terephthalic acid, and, pre~erably polyhydroxy compounds, such as ethylene glycol, propyle~e ~lycol~ diethylene ~lycol, pentaerythritol, soroi-` tol, sucrose ~nd, preferably, glycerol and trimethylolpro-pane. The nitro~en-free polyether-polyols may have straight or branched chains.
To produce the dimensionally stable single-component polyurethane foams, it has proved advantageous to use polyol mixtures which comprise a) from 10 to 90% by weight, preferably from 50 to 70% by ~eight, based on the total weight o~ the polyol mixture, of a difunctional to octafunctional polyester-polyol and/or polyether-polyol which has a hydroxyl number of from 40 to 500 and contains one or more chemically bonded tertiary amino groups in the poiymer chain and b) from 90 to 10% by weight, preferably from 50 to 300,6 by weight, based on the total weight of the polyol mixture, of a difunctional to octafunctional, nitrogen~free polyester-polyol and/or polyether~polyol having a hydroxyl number OL
~rom 40 to 500.
To prepare the prepolymers containing isocyanate groups, the organic polyisocyanates are reacted with the nitrogen-containing polyol or polyol mixture according to the invention at from 0 to 100C, preferably from 20 to 60C, in a ratio such that from 2to 10, preferably from 4to 8, NC0 groupsarepresent in the reaction mixture per hydroxyl group.
In the process according to the invention, the . 9 A O.Z. 0050/032961 blowing agents used are low-boiling liquids which rapidly evaporate when the mixture is released, and which are inert toward. the other constituents. of the mixture. Examples of suitable blowing agents are hàlohydrocarbons boiling at below 50C, preferably at from -50 to 30C, under atmospheric pressure, ~g. monochlorodifluoromethane, dichloromonofluoro-methane, dichlorodifluoromethane a~d trichloro~luoromethane and .mixtures of these, in particular mi~tures comprising ~rom 30 to 80% by weight of monochlorodifluoromethane or dichloro-0 di~fluoromethane and from 70 to 20% by wei~ht of trichloro-monofluoromethane or dichloromonofluoromethane, the percent-ages by weight being based on the total weight of the mix-ture (the halohydrocarbons being used in amounts of from 20 to 30% by weight, preferably from 23 to 28% by weight, based on the weiOht of the prepolymer containing isocyanate groups), hydrocarbons and dialky'ethers boiling at below 50C, pre~erably at from -50 to 30C, under atmospheric pressure, eg. propane and especially isobutane, and dimeth~l ether (these blowing agents being used in amounts of ~rom 5 to 25 per cent by weight, preferably ~rom 10 to 20 per cent by weight, based on the weight of the pre-polymer containing isocyanate groups) However, preferred blow-ing agents are mixtures of the above halohydrocarbons and hydrocarbons in the weight ratio of from 90:10 to 50:50, preferably from 90:10 to 80:20, in particular mixtures of dichlorodifluoromethane-with propane, isobutane or dimeth~l ether. The amount o~ bIowing agent mLxture required can easily be calculated, in accordance with the ratio of halo-hydrocarbor. to hydrocarbon, from ~he data given aoove for - 10 - . O.Z. 0050/032961 the individual components. The blowing agents are present virtually entirely in the liquid form in the storage-stable mixture which is under pressure.
If desi.red, assistants and additives may also be incorporated into the storage-stable J ~oamable mixture.
Examples are sur~actants, plasticlzers, ~lameproofing agents, pore regulators, U~ absorbers, dyes and anti-hydrolysis agents.
By way o~ example, sur~actants which assist the homogenization o~ the starting materials and may also serve to reg~late the cell 3 ~ructure o~ the ~oams can be used.
Speci~ic examples are siloxane-oxyalkylene copolymers and other organopolysiloxanes, oxyethylated alk~lphenols, oxy-ethylated fatty alcohols ! para~in oils, castor oil esters, ricinoleic acid esters and turkey red oil, these being employed in amounts of ~rom 0.1 to 10 per cent by weight, based on the weight o~ prepol~mer containing isocyanate groups.
It can also be advantageous to incorporate a plasti-cizer into the reaction mixture so that the tendency ol theproducts to brittleness is reduced. Conventional plasticizers can be used but it is particularl~ advantageous to employ those which con~ain phosphorus atoms and/or halogen atoms and hence additionally increase the flame repellency of the polyurethane plastics. Amongs-t the latter Plasti-cizers are tricresyl phosphate, tris-2-chloroethyl phosphate, tris-~-chloropropyl phosphate and tris-2,3-dibromopro~yl phosphate.
In addition to the above halogen-substituted phos-- 11 - O.Z. 0050/032961 phatesj the ~ollowing may, ~or example, be used as flame-proofing agents: chloropara~ins, halophosphites, ammonium phosphate and halogen-containing and phosphorus-containing resins.
The storage-stable, ~oamable mixture o~ prepolymers containing isocyanate groups and of blowing a~nts, ~ith or without assistants~and additives, may ~or example be pre-pared in bulk in pressure kettles and then be packaged in suitable containers o~ various sizes, for example aerosol cans of from 0.25 to 5 liters capacity or pressure vessels of - ~rom 50 to 100 liters capacity, such as those conventionally employed for industrial purposes. However, it is also possible to prepare the prepolymer, containing isocyanate groups, from polyisocyanates and the nitrogen-containing polyols or the polyol mixture directly in the appropriate pressure vessels in the presence o~ the blowing agen-t, or to introduce the blowing agent subsequently into the pressure vessel.
To prepare the dimensionally stable polyurethane ~oam, the storage-stable mixture, which is under pressure, o~ the prepolymers containing isocyanate groups, and of blowing agents, with or without assistants and additivQs, is brought to atmospheric pressure by means o~ a suitable device, for example a valve. On releasing the pressure, the mixture foams up and cures rapidly by reaction with the atmosphere, in particular by react~on with the water vapor contained in the latter. As a result o~ the u~e of the nitrogen-containin~ polvols or polyol mixture according to the invention, a relatively pressure-resistant and , o~
- 12 - o.Z. 0050/032901 dimensionally stable closed-cell polyurethane foam is formed rapidly. Post- expansion of the foam due to diffusion of blowing agent, air and the carbon dioxide formed during the curing reaction is thereby virtually completely suppressed, especially i~ blowing agent miYtures of halo-hydrocarbons and hydrocarbons are used.
.. .... . .
The storage-stable, foamable mixtures according to the invention may be used for the manufacture of dimension-ally stable one-component polyurethane foams ~hich can serve as sealants, crack fillers, insulating materials and the like.
~ he Examples which follow! and in which parts are by weight, illustrate the invention.
EXAMPLES 1 TO 20 AN~ COMPARATIVE EXAMP$ES A L~D B
The starting materials summarized in the Tables which follow, in the amounts (parts) shown, are introduced, at room temperature; into a pressure vessel equipped with a safety valve, and are miYed thoroughly. The reactive mixture is allowed to foam up by releasing the pressure.
- 13 _ O .Z . 0 05 0/03 296 l ~A~ 1.
_ ___ _ . . r 1 2 3 4 5 Stertlng material~ lholecuI r~ ' - - -(g~mole) Qxypropylated ~lycerol 720 20 1,500 Oxypropylated triQethylol.propane 400 Oxypropyl~t¢d trlRthaDola~14R ~20 1,500 ao ~ 3~400 43 oxypropylsted ethylenedlamir~e 3~750 43 Oxypropylsted glycerol plus 4,ooo N,N-dlbutylglycidylamine 41200 43 4,aoo Polye~ar o~ adiplc ac~d, ethylen~ 640 15 glycol, dlQ~hanolsQine and 2 ~0cO
triethanolamlne 4 ~500 Crude MD~ 150 150150 120150 2ria~2-chloroethyl phosphata 25 25 25 25 25 SiloxaDe-oxyalkylaDe copolymer 6 6 6 6 6 N,N-Dimethylcyclohe cylamine Mono~luorotrlchloromqthane Dinuorodlchloromethana5 50 5 5 5 Mono n uorodichloromqthsne DirluoromonochloromethaoQ
Dlmethyl qther 12 12 12 130-~utane 15 Propene 15 Propertlea Den31ty o~ th~ rlgid roam (Xg/m3) 20 20 25 35 30 Settlng tl~e (hours) 2 2 2 3 3 Curi~g ti~e (hour3) 5 5 5 S 8 ShelS li~e ~t 60C (d) ?60 >60>60 ~0 >60 Post-expansioD oS a sand~lch aamplel(~) 0-10 0-lO 0-lO 0-5 0-5 _ .
Sheet metal ~trips: 20 c~ loDg, 5 cm wldR, ahset apaclD~ lo 3 cm, maximum or i miolmu~ apscing o~ the ah~ets 1, X ~ r(l-lo)lo~100 (22C~ 60X rslative at~ospheric hu~ldlty) .. . .. ..
.
TA~ 2~ - 14 _ O,Z , 0050 /032961 . ~
EXsmple 6 7 8 9 10 St~rtlng matoriala~oldcu~ar (g/mol~) Oxy~ropylated g1YCQrO11, 5720 Oxy~propylated trimothylolpropsna400 20
According to disclosures of British Patents 1,086,609 and 1,175,717, the components A and B can be sep-arately introduced into aerosol cans, stored, mixed oymeans of a su.itable device and discharged from the can as a foamable mixture. A disadvantage o~ the process des-cribed is that it uses an expensive multi-compartment container with a mixing device, and that the entire contents o~ the can must be processed at once, since the mixture of components A and ~ cannot be stored.
U.S. Patent 3.830,750 also describes the manu~ac~ure of foamable polyurethane mix~ures, but the mixture of cur-able polymer or polymer intermediate and an inert blowing agent which is soluble in the polymer is accommodated in a . container ~rom which any desired amounts o~ ~oam, within ~he limit of ~he capacity of the container, can be dispensed.
Though the one-component foam allows conuenient and advan-~ tageous processing - for example it can be discharged from the aerosol can without weighing and mixing - this process also has certain disadvantages. For example, the poly-urethane mixture described in U.S. Patent 3,830,760 has onl-~
a limited shelf li~e, the viscosity of the mix~ure rises relatively rapidly, and the contents o~ the can solidily on , .. . . . .
prolonged storage. It is a further disadvantage that the foamed polyurethane mixture reacts with the atmosphere, and cures, relatively slowly, so that the polyurethane foam may undergo post-expansion. This can lead to distortion of articles which have been filled with foam, for example door Erames or window frames.
It ts an object of tlle present inv~ntion to provide dLmensionally stable polyurethane foams obtained from a ~'oamable polyurethane mixture wh:Lch has a shel lie o at least 18 months at room temperature, can be stored in a single container and can be foamed by releasing the mixture.
We have found that this object is achieved by a improved process for the manufacture o dimensionally stable p~lyurethane oa~ o the type comprising releasing the pressure on ~n~xture of prepolymers which is held in a one-compartment container under greater than atmospheric pressure and thereater curing this foam by interaction with the atmosphere. This process is improved in that use is made therein of a mixture of prepolymers which has a shelf life of at least 60 days at 60~C., this prepolymers containing isocyanate groups and being admixed with blowiny agents, wherein the prepolymers used, having an NCO content of from 5 to 25 percent by weight, based on the weight of the prepolymer are prepared by the reaction of a mixture of diphenylmethane-diisocyanates and polyphenyl-polymethylene-polyisocyanates with trifunctional or tetrafunc-tional polyols having a hydroxyl number of from 40 to 500 and a molecular weight of from 500 to 5000, and containing chemically bonded tertiary amino groups in the polymer chain, which polyols are selected from the group consisting of poly-esterpolyols, polyether-polyols and mixtures thereof, or by reaction of mixtures of such polyols with nitrogen-free polyester-polyols and/or polyether-polyols.
ilL4~
The reaction, according to the invention, of the polyfunctional nitrogen-containing polyester-polyols and/or polyether-polyols or, preferab~ly, of the mixtures of poly-functional nitrogen-containing and nitrogen-free polyester-, /
/
. .
-3a-~` -~ - ~
_ 4 _ O.Z 0050/032961 polyols and/or polyether-polyols, with organic polyisocyan-ates gives prepolymers containing isocyanate groups "~hich after foaming react rapidly with the atmosphere and cure to give dimensionally stable polyurethane foams.
Since, according to the invention, the foamable mix-tures do ~ot contain any conventional lo~ molecular weight monomeric polyurethane cataiysts, for example catalysts with molecular weights of less than 300 , such as tertiary amines, salts of or~anic acids, organic tin compounds and the like, the mixtures have an extremely long shelf life, ie. of more than 18 months, at room temperature.
It is a;further advantage that blowing agents which can be used are not only fluorochloromethanes, such as mono-fluorotrichloromethane, di~luoromonochloromethane and di fluorodichloromethane and their mixtures, but also hydro-carbons which do not pollute the environment; preferably, mixtures o~ fluorochloromethanes and hydrocarbons are employed.
As has already been explained, the prepolymers con-taining isocyanate groups, ~hich have an NC0 content of from 5 to 25 per cent by weight, preferably from 10 to 20 per cent by weight, based on the weight of the prepolymer, are pre-pared by reaction of preferably aromatic polyisocyanates with the polyols, or polyol mixtures, containing tert.-amino groups, according to the invention.
Exampies of aromatic polyisocyanates are mixtures of toluylene diisocyanates, such as 2,4- and/or 2,6-toluylene _ 5 _ o.Z~ 0050/03296l diisocyanate and diphenylmethane-diisocyanate3 and polyohen~l-polymethylene-polyiisocyanates (crude MDI). Preferably, a mi.Yt-lre of polyphenyl-polymethylene polyisocyanates and diphenylmethane diiso-cyanates (crudel~DI), containing from 90 to 40 per cent by wei~ht, preferably from ~0 to 50 per cent by weight, based on the total weight of the mixture, of diphenylmethane diisocyanate isomers, is used.
m e nitrogen-containing polyols used are di~`unctional to octa~unctional, preferably trifunctional or tetra-functional, polyester-polyols and/or, preferably, polyether-polyols, which have hydroxyl numbers of from 40 to 500, preferably from 40 to 200, and which contain at least one, pre~erably from 1 to 6, chemically bonded tertiary amino groups in the pol~J~er chain. Suitable nitrogen-contain-ing polyester-polyols which have molecular weights o~ from 500 to 5,000, preferably from 1,000 to 4,000, can be pre-pared, for example, from polycarboxylic acids,~preferably dicarboxylic acids, and dialkanolamines and/or trialkanol--amines, eg. diisopropanolamine and/or triisopropanolamine, which may or may not be mixed with polyhydric alcohols, or from polycarboxylic acids and mixtures of polyamines, eg. ethylenediamine, diethylenetriamine or N-methyletkylene-^triamine, and polyhydric alcohols. Examples of poly-- carboxylic acids are glutaric acid, sebacic acid, phthalic acid, isophthalic acid, terephthalic acid and ? preferably, -~ succinic acid and adipic acid. Examples of polyhvdric - ~ 6 - O.Z. 00~0/0329~1 alcohols are ethylene glycol, 1,3- and 1,2-propanediol, 1,4-butanediol, 1,6-hexanediol, diethylene glycol, di-propylene glycol, glycerol, trimethylolpropane and penta-erythritol.
Pre~erably, however, nitrogen-containing polyether-pol~ols having molecular wei~hts o~ ~rom 500 to 5,000, pre-~erably ~rom 1,000 to 4,000, are used. These can be prepared by conventional methods from one or more alkylene oxides, where alkylene is o~ 2 to 4 carbon atoms~ and a starter molecule ~hich contains an amino group and possesses from 2 to 8, pre~erably ~ or 4, active hydrogen atoms.
Examples o~ suitable alkylene oxides are 1,3-propylene oxide, 1,2- and 2,3-~utylene o~ide, styrene oxide and, pre~erably, ethylene oxide and 1,2-propylene oxide. The alkylene oxides may be used individually, in alternating succession, or ~s mixtures. Examples o~ suitable starter molecules containin~ amino groups are ammonia, hydrazine, mo'noalkyl-hydrazines and dialkylhydrazines, where alXyl is of 1 to 6 carbon atoms, guanidine, substituted guanidines, diamines, N-monoalkyl-, N,N-dialkyl- and N,N'-dialkyl-diamines, where alkyl is of 1 to 6 carbon atoms, such as ethylenediamine, and 1,3-propylenediamine, butylenediamine, hexamethy_ lenediamine, 2,4- and 2,6-toluylenediamineJ and 4,4'-, 2,4'- and 2,2'-diaminodiphenylmethane, and aminoalcohols, eg. monoethanolamine, diethanolamine and triethanolamine.
Pre~erred starter molecules containing amino groups are - triethanolamine, alkylenediamines, dialkylenetriamines, trialkylenetetramines and low molecular weight polyethylene-~7 ~
~ 7 - o.z. 0050~032961 diamines.
In another embodIme~t of the process, nitrogen-. containing polyether-polyols can be prepared ~rom nitroger~-free starter molecules, alkylene oxides and, ~or example, dibutylamino~lycldol, so that the nitrogen is not in the main polyrner chain but in the side chain.
The di~unctional to octa~unctional polyester-polyols and polyether-polyols, containing tertiary amino groups~ may be used as such or as mixtures.
Pre~erably, however, t~e polyols used are mixtures o~ the above difunctional to octafunctional polyester polyols and/or polyether-polyols, con~aining tertiary amino groups, with nitrogen-free difunctional to octafunctional, prefer-ably tetra~unctional and trifunctional, polyester-polyols and/or polyether-polyols having hydroxyl numbers of from ~0 to 500, preferably from 200 to 400. Suitable nitrogen-free polyester-polyols ~ave molecular weights of from 400 to 4,000, preferably from 500 to 2,000, and can be prepared, for example, from the above polycarboxylic acids, preferably dicarboxylic acids, and polyhydric alcohols, ~referably diols.
~ ~ Preferably, however, conventional nitrogen-free polyether-polyols having molecular weights of from 400 to 4,000, preferably from 400 to 2,000, are used in the polyol mixture according to the invention. The polyether-polyols are prepared by conventional methods from one or more of the above alkylene oxides and a nitrogen-free starter molecule. Examples o~ suitable nitrogen-lree - 8 - o.z. 0050/032961 starter molecul~s are ~rater, phosphoric acid, polycarboxylic acids, especially dicarboxylic acids, such as adipic acid, succinic acid, phthalic acid and terephthalic acid, and, pre~erably polyhydroxy compounds, such as ethylene glycol, propyle~e ~lycol~ diethylene ~lycol, pentaerythritol, soroi-` tol, sucrose ~nd, preferably, glycerol and trimethylolpro-pane. The nitro~en-free polyether-polyols may have straight or branched chains.
To produce the dimensionally stable single-component polyurethane foams, it has proved advantageous to use polyol mixtures which comprise a) from 10 to 90% by weight, preferably from 50 to 70% by ~eight, based on the total weight o~ the polyol mixture, of a difunctional to octafunctional polyester-polyol and/or polyether-polyol which has a hydroxyl number of from 40 to 500 and contains one or more chemically bonded tertiary amino groups in the poiymer chain and b) from 90 to 10% by weight, preferably from 50 to 300,6 by weight, based on the total weight of the polyol mixture, of a difunctional to octafunctional, nitrogen~free polyester-polyol and/or polyether~polyol having a hydroxyl number OL
~rom 40 to 500.
To prepare the prepolymers containing isocyanate groups, the organic polyisocyanates are reacted with the nitrogen-containing polyol or polyol mixture according to the invention at from 0 to 100C, preferably from 20 to 60C, in a ratio such that from 2to 10, preferably from 4to 8, NC0 groupsarepresent in the reaction mixture per hydroxyl group.
In the process according to the invention, the . 9 A O.Z. 0050/032961 blowing agents used are low-boiling liquids which rapidly evaporate when the mixture is released, and which are inert toward. the other constituents. of the mixture. Examples of suitable blowing agents are hàlohydrocarbons boiling at below 50C, preferably at from -50 to 30C, under atmospheric pressure, ~g. monochlorodifluoromethane, dichloromonofluoro-methane, dichlorodifluoromethane a~d trichloro~luoromethane and .mixtures of these, in particular mi~tures comprising ~rom 30 to 80% by weight of monochlorodifluoromethane or dichloro-0 di~fluoromethane and from 70 to 20% by wei~ht of trichloro-monofluoromethane or dichloromonofluoromethane, the percent-ages by weight being based on the total weight of the mix-ture (the halohydrocarbons being used in amounts of from 20 to 30% by weight, preferably from 23 to 28% by weight, based on the weiOht of the prepolymer containing isocyanate groups), hydrocarbons and dialky'ethers boiling at below 50C, pre~erably at from -50 to 30C, under atmospheric pressure, eg. propane and especially isobutane, and dimeth~l ether (these blowing agents being used in amounts of ~rom 5 to 25 per cent by weight, preferably ~rom 10 to 20 per cent by weight, based on the weight of the pre-polymer containing isocyanate groups) However, preferred blow-ing agents are mixtures of the above halohydrocarbons and hydrocarbons in the weight ratio of from 90:10 to 50:50, preferably from 90:10 to 80:20, in particular mixtures of dichlorodifluoromethane-with propane, isobutane or dimeth~l ether. The amount o~ bIowing agent mLxture required can easily be calculated, in accordance with the ratio of halo-hydrocarbor. to hydrocarbon, from ~he data given aoove for - 10 - . O.Z. 0050/032961 the individual components. The blowing agents are present virtually entirely in the liquid form in the storage-stable mixture which is under pressure.
If desi.red, assistants and additives may also be incorporated into the storage-stable J ~oamable mixture.
Examples are sur~actants, plasticlzers, ~lameproofing agents, pore regulators, U~ absorbers, dyes and anti-hydrolysis agents.
By way o~ example, sur~actants which assist the homogenization o~ the starting materials and may also serve to reg~late the cell 3 ~ructure o~ the ~oams can be used.
Speci~ic examples are siloxane-oxyalkylene copolymers and other organopolysiloxanes, oxyethylated alk~lphenols, oxy-ethylated fatty alcohols ! para~in oils, castor oil esters, ricinoleic acid esters and turkey red oil, these being employed in amounts of ~rom 0.1 to 10 per cent by weight, based on the weight o~ prepol~mer containing isocyanate groups.
It can also be advantageous to incorporate a plasti-cizer into the reaction mixture so that the tendency ol theproducts to brittleness is reduced. Conventional plasticizers can be used but it is particularl~ advantageous to employ those which con~ain phosphorus atoms and/or halogen atoms and hence additionally increase the flame repellency of the polyurethane plastics. Amongs-t the latter Plasti-cizers are tricresyl phosphate, tris-2-chloroethyl phosphate, tris-~-chloropropyl phosphate and tris-2,3-dibromopro~yl phosphate.
In addition to the above halogen-substituted phos-- 11 - O.Z. 0050/032961 phatesj the ~ollowing may, ~or example, be used as flame-proofing agents: chloropara~ins, halophosphites, ammonium phosphate and halogen-containing and phosphorus-containing resins.
The storage-stable, ~oamable mixture o~ prepolymers containing isocyanate groups and of blowing a~nts, ~ith or without assistants~and additives, may ~or example be pre-pared in bulk in pressure kettles and then be packaged in suitable containers o~ various sizes, for example aerosol cans of from 0.25 to 5 liters capacity or pressure vessels of - ~rom 50 to 100 liters capacity, such as those conventionally employed for industrial purposes. However, it is also possible to prepare the prepolymer, containing isocyanate groups, from polyisocyanates and the nitrogen-containing polyols or the polyol mixture directly in the appropriate pressure vessels in the presence o~ the blowing agen-t, or to introduce the blowing agent subsequently into the pressure vessel.
To prepare the dimensionally stable polyurethane ~oam, the storage-stable mixture, which is under pressure, o~ the prepolymers containing isocyanate groups, and of blowing agents, with or without assistants and additivQs, is brought to atmospheric pressure by means o~ a suitable device, for example a valve. On releasing the pressure, the mixture foams up and cures rapidly by reaction with the atmosphere, in particular by react~on with the water vapor contained in the latter. As a result o~ the u~e of the nitrogen-containin~ polvols or polyol mixture according to the invention, a relatively pressure-resistant and , o~
- 12 - o.Z. 0050/032901 dimensionally stable closed-cell polyurethane foam is formed rapidly. Post- expansion of the foam due to diffusion of blowing agent, air and the carbon dioxide formed during the curing reaction is thereby virtually completely suppressed, especially i~ blowing agent miYtures of halo-hydrocarbons and hydrocarbons are used.
.. .... . .
The storage-stable, foamable mixtures according to the invention may be used for the manufacture of dimension-ally stable one-component polyurethane foams ~hich can serve as sealants, crack fillers, insulating materials and the like.
~ he Examples which follow! and in which parts are by weight, illustrate the invention.
EXAMPLES 1 TO 20 AN~ COMPARATIVE EXAMP$ES A L~D B
The starting materials summarized in the Tables which follow, in the amounts (parts) shown, are introduced, at room temperature; into a pressure vessel equipped with a safety valve, and are miYed thoroughly. The reactive mixture is allowed to foam up by releasing the pressure.
- 13 _ O .Z . 0 05 0/03 296 l ~A~ 1.
_ ___ _ . . r 1 2 3 4 5 Stertlng material~ lholecuI r~ ' - - -(g~mole) Qxypropylated ~lycerol 720 20 1,500 Oxypropylated triQethylol.propane 400 Oxypropyl~t¢d trlRthaDola~14R ~20 1,500 ao ~ 3~400 43 oxypropylsted ethylenedlamir~e 3~750 43 Oxypropylsted glycerol plus 4,ooo N,N-dlbutylglycidylamine 41200 43 4,aoo Polye~ar o~ adiplc ac~d, ethylen~ 640 15 glycol, dlQ~hanolsQine and 2 ~0cO
triethanolamlne 4 ~500 Crude MD~ 150 150150 120150 2ria~2-chloroethyl phosphata 25 25 25 25 25 SiloxaDe-oxyalkylaDe copolymer 6 6 6 6 6 N,N-Dimethylcyclohe cylamine Mono~luorotrlchloromqthane Dinuorodlchloromethana5 50 5 5 5 Mono n uorodichloromqthsne DirluoromonochloromethaoQ
Dlmethyl qther 12 12 12 130-~utane 15 Propene 15 Propertlea Den31ty o~ th~ rlgid roam (Xg/m3) 20 20 25 35 30 Settlng tl~e (hours) 2 2 2 3 3 Curi~g ti~e (hour3) 5 5 5 S 8 ShelS li~e ~t 60C (d) ?60 >60>60 ~0 >60 Post-expansioD oS a sand~lch aamplel(~) 0-10 0-lO 0-lO 0-5 0-5 _ .
Sheet metal ~trips: 20 c~ loDg, 5 cm wldR, ahset apaclD~ lo 3 cm, maximum or i miolmu~ apscing o~ the ah~ets 1, X ~ r(l-lo)lo~100 (22C~ 60X rslative at~ospheric hu~ldlty) .. . .. ..
.
TA~ 2~ - 14 _ O,Z , 0050 /032961 . ~
EXsmple 6 7 8 9 10 St~rtlng matoriala~oldcu~ar (g/mol~) Oxy~ropylated g1YCQrO11, 5720 Oxy~propylated trimothylolpropsna400 20
3 4430 25 ~5 Oxypropylated trl~tha~olsmlne 720 40 1,50~ 100 3,400 Oxypropyl~ted ethylenodlsmlne 3,750 43 Oxypropylated slYcerol plua 4,000 80 N,N-dlbutylgly~ldylsQl~e4,200
4,800 Polyes~r of adiplc acld, ethylene640 glycol, diethsnolsmiQe and 2,000 triethanolamln~ 4,500 53 Crude MOI 150150120 150150 Trla-2-chloroethyl phcsphsta 25 25 25 25 25 Sil~xane-oxyalkylene copolymer 6 6 6 6 6 N,~-Dlmethylcyclohexylaml~s Mo~o~luorotrlchloromot~sne 42 Di n uorodichloromethano 42 42 ~ono n uorodlchloromeths~e 42 42 Diiluoromouochloromethane 42 80 50 Dimethyl ether 12 iao-Butane Fropsne Propertle~
I~n3ity Or the rl~sld roam (k~/m3) 20 25 30 25 30 Settl~g time (hour~ . 2 3 2 2 Curi~g tlme (houra) 5 5 6 5 6 Shol~ e at 60C (d~ ~60 ~60~60~oO ~60 Po3t-expan~lo~ o a sardwlch ~ample'(~) 0-10 0-5 0-5 O-lo 0-10 -- . . . . . .
~Shest ;netal strlp : 20 cm long, 5 cm wlde, 3heet spacing lo 3 cm, maximum or ~inimum spacln3 o~ the aheets 1, )lo].100 (22C, 60% rslatlve at~cspherlc hu~ldity) ._. , . .... .. . .................. . ._ ~. .
. .
15 _ 0.~. 0050 /03 296 1 8t~rtl3g ~aterials ~wri~ht 11 i2 13 14 1 ~/mol~) Oxy~ropylated glyearol 720 1,500 OYypropylat~d trlmet~ylolpropane 3 4430 25 25 Oxypropyl~ted trieths301aml~e 720 . 1,500 3,400 Oxypropylatad ethyle3edlamlne 3,750 43 Oxypropylated glycerol plus 4 000 90 N,N~dlbutylglycldyl~mlne 4 200 43 4,800 43 43 Polyea+qr o~ adlplc acld, ethylene 640 glycol, dlethanolamlne and 2,000 trletha~olamlne 4,500 Crude MDI 150150150 150150 Tris-2-ehloroethyl phosphata 25 25 25 25 25 Siloxa3e-oxyalkylsne copolymer 6 6 6 6 6 N,N-Dimethylcyclohexylamine Monoiluorotrlchloromethane 42 42 Di n uorodlehloromethaoe 50 50 42 ~lononuorodlcblorometbane Di~luoromonoehlorometha3e 42 50 Dimethyl ether . 12 l~o-auta3e 15 Props3u 15 ~eD~lty oi~ the rigld ~oam (x8/~3~ 25 25 25 ~5 30 Settlng time (hour~) 1 2 2 3 Curln~ tlme (hours) 6 8 5 6 6 Shel~ llfe at 60C ~d) 60 60 60 60 60 Po~t-expanqion Or a ea~dwich sa~ple+(~) 5-10 5-10 0-5 0-10 0-10 ... . ... , . . . _ . , , _ _ .
She~t metal atrips: 20 cm long, 5 cm wlde, sheet spac1ng lo 3 em, m~xl~um or ~lnl~um spacln8 o~ the sheets 1, lo)lo].100 (22C, 60% relstlYa at~ospherlc hu~idlty) . . . .. .. , . _.
.
:` `
- 16 _ O.Z. 0050/032901 TA~L~ 4:
... . . _ _ ....... _ .. _ ... .. . _ _ E~cample 15 1~ 18 19 20 A 3 . . . _ . ~ . 1 _ _ _ .
Starting materlale (w/iglht) Oxypropylated glycerol 720 . ZO 4d n 1,500 100 Oxypropylated trimethylolpropane 400 z5 3,450 45 Oxypropyl~ted trlathanolamlnQ 720 1 ,500 3,400 Oxypropylated ethyle~ediamlne 3,750 43 Oxypropylated glycercl plus 4,000 N,N-dibutylglycidylamine4, 200 ~,800 Polye ter of adiplc acld, ethylene 640 20 glycol, diethanolamlne cnd 2,000100 ao triethanolamine 4,500 53 Cruda MDI 150 120 150 150150120 150 Tris-2-cbloroethyl p~osphate 25 25 2525 25 25 50 Siloxane-oxyaL~ylene copolyme~ 6 6 6 6 6 2 2 N,N Dimethylcyclohexylamine o.6 o.6 Mo~ofluorotrichloromethane 42 30 Difluorodichloromethane 50 50 90 5042 90 150 Mo~lofluorodichloromethane Dl:~luoromonochloromethane Dimethyl ether 12 lso-F~utane 15 Propane 15 Propertles Denslty of tha rigid foam(Xg/m3) 25 30 35 20 30 30 3;
Setting time (hours~ 3 2 1 1 2 1 5 Curing time (hour~) 6 8 5 6 5 10 10 Shelf life at 60C (d) 60 60 60 60 60 14 14 Post-expansion of a sarldwich samplel(%) 5-10 5-10 0-100-5 0-5 5-15 5-lS
~Sheet metal strips: 20 cm long, 5 cm wide, s~ieet spacing lo 3 cm, maxlmum or minimum ~pacing of the sheets 1, ~X .. ~l-lo)lo].100 (22C, 60~6 relati~re atmospherlc humidlty) ,
I~n3ity Or the rl~sld roam (k~/m3) 20 25 30 25 30 Settl~g time (hour~ . 2 3 2 2 Curi~g tlme (houra) 5 5 6 5 6 Shol~ e at 60C (d~ ~60 ~60~60~oO ~60 Po3t-expan~lo~ o a sardwlch ~ample'(~) 0-10 0-5 0-5 O-lo 0-10 -- . . . . . .
~Shest ;netal strlp : 20 cm long, 5 cm wlde, 3heet spacing lo 3 cm, maximum or ~inimum spacln3 o~ the aheets 1, )lo].100 (22C, 60% rslatlve at~cspherlc hu~ldity) ._. , . .... .. . .................. . ._ ~. .
. .
15 _ 0.~. 0050 /03 296 1 8t~rtl3g ~aterials ~wri~ht 11 i2 13 14 1 ~/mol~) Oxy~ropylated glyearol 720 1,500 OYypropylat~d trlmet~ylolpropane 3 4430 25 25 Oxypropyl~ted trieths301aml~e 720 . 1,500 3,400 Oxypropylatad ethyle3edlamlne 3,750 43 Oxypropylated glycerol plus 4 000 90 N,N~dlbutylglycldyl~mlne 4 200 43 4,800 43 43 Polyea+qr o~ adlplc acld, ethylene 640 glycol, dlethanolamlne and 2,000 trletha~olamlne 4,500 Crude MDI 150150150 150150 Tris-2-ehloroethyl phosphata 25 25 25 25 25 Siloxa3e-oxyalkylsne copolymer 6 6 6 6 6 N,N-Dimethylcyclohexylamine Monoiluorotrlchloromethane 42 42 Di n uorodlehloromethaoe 50 50 42 ~lononuorodlcblorometbane Di~luoromonoehlorometha3e 42 50 Dimethyl ether . 12 l~o-auta3e 15 Props3u 15 ~eD~lty oi~ the rigld ~oam (x8/~3~ 25 25 25 ~5 30 Settlng time (hour~) 1 2 2 3 Curln~ tlme (hours) 6 8 5 6 6 Shel~ llfe at 60C ~d) 60 60 60 60 60 Po~t-expanqion Or a ea~dwich sa~ple+(~) 5-10 5-10 0-5 0-10 0-10 ... . ... , . . . _ . , , _ _ .
She~t metal atrips: 20 cm long, 5 cm wlde, sheet spac1ng lo 3 em, m~xl~um or ~lnl~um spacln8 o~ the sheets 1, lo)lo].100 (22C, 60% relstlYa at~ospherlc hu~idlty) . . . .. .. , . _.
.
:` `
- 16 _ O.Z. 0050/032901 TA~L~ 4:
... . . _ _ ....... _ .. _ ... .. . _ _ E~cample 15 1~ 18 19 20 A 3 . . . _ . ~ . 1 _ _ _ .
Starting materlale (w/iglht) Oxypropylated glycerol 720 . ZO 4d n 1,500 100 Oxypropylated trimethylolpropane 400 z5 3,450 45 Oxypropyl~ted trlathanolamlnQ 720 1 ,500 3,400 Oxypropylated ethyle~ediamlne 3,750 43 Oxypropylated glycercl plus 4,000 N,N-dibutylglycidylamine4, 200 ~,800 Polye ter of adiplc acld, ethylene 640 20 glycol, diethanolamlne cnd 2,000100 ao triethanolamine 4,500 53 Cruda MDI 150 120 150 150150120 150 Tris-2-cbloroethyl p~osphate 25 25 2525 25 25 50 Siloxane-oxyaL~ylene copolyme~ 6 6 6 6 6 2 2 N,N Dimethylcyclohexylamine o.6 o.6 Mo~ofluorotrichloromethane 42 30 Difluorodichloromethane 50 50 90 5042 90 150 Mo~lofluorodichloromethane Dl:~luoromonochloromethane Dimethyl ether 12 lso-F~utane 15 Propane 15 Propertles Denslty of tha rigid foam(Xg/m3) 25 30 35 20 30 30 3;
Setting time (hours~ 3 2 1 1 2 1 5 Curing time (hour~) 6 8 5 6 5 10 10 Shelf life at 60C (d) 60 60 60 60 60 14 14 Post-expansion of a sarldwich samplel(%) 5-10 5-10 0-100-5 0-5 5-15 5-lS
~Sheet metal strips: 20 cm long, 5 cm wide, s~ieet spacing lo 3 cm, maxlmum or minimum ~pacing of the sheets 1, ~X .. ~l-lo)lo].100 (22C, 60~6 relati~re atmospherlc humidlty) ,
Claims (6)
1. In the process for the manufacture of a dimensionally stable polyurethane foam by releasing the pressure one mixture of prepolymers which is held in a one-compartment container under greater than atmospheric pressure and thereafter curing said foam by interaction with the atmosphere, the improvement comprising employing a mixture of prepolymers which has a shelf life of at least 60 days at 60°C., said prepolymers containing isocyanate groups and being admixed with blowing agents, wherein the prepolymers used, having an NCO content of from 5 to 25 percent by weight, based on the weight of the prepolymer are prepared by the reaction of a mixture of diphenylmethane-diisocyantes and polyphenyl-polymethylene-polyisocyanates with trifunctional or tetrafunc-tional polyols having a hydroxyl number of from 40 to 500 and a molecular weight of from 500 to 5000, and containing chemically bonded tertiary amino groups in the polymer chain, which polyols are selected from the group consisting of polyester-polyols, polyether-polyols and mixtures thereof, or by reaction of mixtures of such polyols with nitrogen-free polyester-polyols and/or polyether-polyols.
2. A process as claimed in claim 1, wherein the polyols used are mixtures which comprise a) from 90 to 10% by weight of a difunctional to octa-functional polyester-polyol and/or polyether-polyol which has a hydroxyl number of from 40 to 500 and contains chemically bonded tertiary amino groups in the polymer chain, and b) from 10 to 90% by weight of a difunctional to octa-functional nitrogen-free polyester-polyol and/or polyether-polyol which has a hydroxyl number of from 40 to 500, the percentages by weight being based on the total weight of the polyol mixture.
3. A process as claimed in claim 1, wherein the blow-ing agents used are mixtures of dichlorodifluoromethane and isobutane, propane or dimethyl ether.
4. A process as claimed in claim 3, wherein the blow-ing agent mixture comprises from 50 to 90 per cent by weight of dichlorodifluoromethane and from 50 to 10 per cent by weight of isobutane, propane or dimethyl ether, the percentages by weight being based on the total weight of the blowing agent mixture.
5. A process as claimed in claim 1, wherein the blowing agent is virtually completely in the liquid form.
6. A process as claimed in claim 1, wherein the reaction is carried out in the absence of conventional low molecular weight polyurethane catalysts.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19772758114 DE2758114A1 (en) | 1977-12-24 | 1977-12-24 | PROCESS FOR THE MANUFACTURING OF SHAPE-STABLE SINGLE-COMPONENT POLYURETHANE FOAMS |
| EP78101741A EP0002768B1 (en) | 1977-12-24 | 1978-12-16 | Process for the preparation of formstable polyurethane foams from prepolymers having extended pot life, containing isocyanate groups and tertiary amino groups |
| AT0917878A AT372392B (en) | 1977-12-24 | 1978-12-21 | METHOD FOR PRODUCING MOLDED POLYURETHANE FOAMS |
| US06/024,828 US4258140A (en) | 1977-12-24 | 1979-03-28 | Storage-stable prepolymers sprayable from a pressure vessel |
| CA000324387A CA1141097A (en) | 1977-12-24 | 1979-03-28 | Manufacture of dimensionally stable polyurethane foams from storage-stable prepolymers containing isocyanate groups and tertiary amino groups |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19772758114 DE2758114A1 (en) | 1977-12-24 | 1977-12-24 | PROCESS FOR THE MANUFACTURING OF SHAPE-STABLE SINGLE-COMPONENT POLYURETHANE FOAMS |
| US06/024,828 US4258140A (en) | 1977-12-24 | 1979-03-28 | Storage-stable prepolymers sprayable from a pressure vessel |
| CA000324387A CA1141097A (en) | 1977-12-24 | 1979-03-28 | Manufacture of dimensionally stable polyurethane foams from storage-stable prepolymers containing isocyanate groups and tertiary amino groups |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1141097A true CA1141097A (en) | 1983-02-08 |
Family
ID=27166153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000324387A Expired CA1141097A (en) | 1977-12-24 | 1979-03-28 | Manufacture of dimensionally stable polyurethane foams from storage-stable prepolymers containing isocyanate groups and tertiary amino groups |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4258140A (en) |
| EP (1) | EP0002768B1 (en) |
| AT (1) | AT372392B (en) |
| CA (1) | CA1141097A (en) |
| DE (1) | DE2758114A1 (en) |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4339343A (en) * | 1980-03-05 | 1982-07-13 | The Upjohn Company | Novel process and product |
| JPS5744636A (en) * | 1980-09-01 | 1982-03-13 | Wako Chem Kk | Impregnating agent for preparing mainly semirigid or rigid resin foam |
| DE3122790C2 (en) * | 1981-06-09 | 1983-12-29 | Henkel KGaA, 4000 Düsseldorf | Process for the production of dimensionally stable polyurethane foams |
| DE3317194A1 (en) * | 1983-05-11 | 1984-11-15 | Henkel KGaA, 4000 Düsseldorf | POLYURETHANE PREPOLYMERS BASED ON OLEOCHEMICAL POLYOLS, THEIR PRODUCTION AND USE |
| DE3317193A1 (en) * | 1983-05-11 | 1984-11-15 | Georg Börner Chemisches Werk für Dach- und Bautenschutz GmbH & Co KG, 6430 Bad Hersfeld | USE OF AN EXPANDING POLYURETHANE ADHESIVE TO CONNECT INSULATION TO BUILDING PARTS |
| GB8602802D0 (en) * | 1986-02-05 | 1986-03-12 | Ici Plc | Microcellular elastomers |
| US5021507A (en) * | 1986-05-05 | 1991-06-04 | National Starch And Chemical Investment Holding Corporation | Arcylic modified reactive urethane hot melt adhesive compositions |
| DE3626223A1 (en) * | 1986-08-02 | 1988-02-04 | Henkel Kgaa | POLYURETHANE PRE-POLYMERS BASED ON OLEOCHEMICAL POLYOLS, THEIR PRODUCTION AND USE |
| US4923097A (en) * | 1989-01-31 | 1990-05-08 | E. I. Dupont De Nemours And Company | Aerosol paint compositions |
| JPH0347823A (en) * | 1989-04-07 | 1991-02-28 | Asahi Glass Co Ltd | Polyol composition and production of rigid polyurethane foam using the same composition |
| DE3911784A1 (en) * | 1989-04-11 | 1990-10-18 | Peter Buesgen | Stable 1-component polyurethane foam mixt., esp. for aerosol cans - contg. low-viscosity prepolymer based on poly-ol with mol. wt. 2000-6500, and has nitrous oxide as propellant gas |
| DE4129953A1 (en) * | 1991-09-10 | 1993-03-11 | Bayer Ag | POLYISOCYANATE MIXTURES, A METHOD FOR THE PRODUCTION AND THEIR USE |
| IT1274003B (en) * | 1994-05-06 | 1997-07-14 | Coim Spa | PREPARATION OF RIGID POLYURETHANE FOAMS WITH THE USE OF POLYESTER POLYESTERS |
| DE4443431A1 (en) * | 1994-12-06 | 1996-06-13 | Elastogran Gmbh | Pressurized, blowing agent-containing isocyanate semi-prepolymer mixtures based on lignin-polyether-polyols, their use for the production of polyurethane foams and a process therefor |
| US5687911A (en) * | 1995-02-18 | 1997-11-18 | Clayton Corporation | Multidirectional foam aerosol dispensing |
| US6013691A (en) * | 1996-05-21 | 2000-01-11 | Insta-Foam Products, Inc. | Expansible sealant compositions and blowing agents |
| FR2779149B1 (en) * | 1998-05-29 | 2000-09-15 | Witco | PROCESS FOR PRODUCING POLYURETHANE FOAM, POLYESTER POLYOL AMINE USED IN THIS PROCESS AND FOAM OBTAINED |
| US6410609B1 (en) | 2000-07-27 | 2002-06-25 | Fomo Products, Inc. | Low pressure generating polyurethane foams |
| US6894083B2 (en) * | 2000-08-08 | 2005-05-17 | Dow Global Technologies Inc. | Polyurethane foam composition |
| DE102007028922A1 (en) | 2007-06-22 | 2008-12-24 | Bayer Materialscience Ag | polyisocyanate |
| DE102008018160A1 (en) | 2008-04-10 | 2009-10-15 | Bayer Materialscience Ag | polyisocyanate |
| DE102009058463A1 (en) | 2009-12-16 | 2011-06-22 | Bayer MaterialScience AG, 51373 | Polyisocyanate mixture, useful e.g. in coating, comprises two various aromatic polyisocyanate mixtures based on diphenylmethane diisocyanate, polyether based on propylene oxide and amino group containing polyether based on propylene oxide |
| EP2383304A1 (en) | 2010-04-27 | 2011-11-02 | de Schrijver, Aster | Composition for one-component polyurethane foams |
| CN102161744B (en) * | 2010-12-15 | 2013-01-30 | 山西省化工研究所 | Preparation method of high-storage-stability polyester-type polyurethane prepolymer |
| EP2481764A1 (en) | 2011-01-27 | 2012-08-01 | de Schrijver, Aster | Composition for one-component polyurethane foams having low free monomeric MDI content |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3042631A (en) * | 1956-08-03 | 1962-07-03 | Simoniz Co | Polyurethane prepolymer and expanded product prepared therefrom |
| US3112281A (en) * | 1957-09-17 | 1963-11-26 | Wyandotte Chemicals Corp | Polyurethane foams and process for preparing same |
| US3029208A (en) * | 1959-07-03 | 1962-04-10 | Allied Chem | Cellular polyurethane and process of preparing same |
| FR79641E (en) * | 1961-04-06 | 1962-12-28 | Ici Ltd | Improvement in the polyurethane manufacturing process |
| GB1086609A (en) | 1965-07-12 | 1967-10-11 | Kerr Chemicals Inc | Improvements in or relating to foamed polyurethane resins |
| GB1175717A (en) | 1967-09-04 | 1969-12-23 | Kerr Chemicals Inc | Improvements in or relating to the Preparation of Polyurethane Foams |
| DE1922626C3 (en) * | 1969-05-03 | 1983-01-13 | Bayer Ag, 5090 Leverkusen | Process for the production of binders |
| US3640997A (en) * | 1969-05-07 | 1972-02-08 | Basf Wyandotte Corp | Sucrose-ethylene diamine polyols and process for preparing same |
| BE756238A (en) * | 1969-09-16 | 1971-03-16 | Ici Ltd | COMPOSITIONS TO EXPAND |
-
1977
- 1977-12-24 DE DE19772758114 patent/DE2758114A1/en not_active Withdrawn
-
1978
- 1978-12-16 EP EP78101741A patent/EP0002768B1/en not_active Expired
- 1978-12-21 AT AT0917878A patent/AT372392B/en not_active IP Right Cessation
-
1979
- 1979-03-28 CA CA000324387A patent/CA1141097A/en not_active Expired
- 1979-03-28 US US06/024,828 patent/US4258140A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US4258140A (en) | 1981-03-24 |
| AT372392B (en) | 1983-09-26 |
| DE2758114A1 (en) | 1979-07-05 |
| ATA917878A (en) | 1983-02-15 |
| EP0002768A2 (en) | 1979-07-11 |
| EP0002768B1 (en) | 1983-01-26 |
| EP0002768A3 (en) | 1979-07-25 |
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| MKEX | Expiry |