Abstract:
PROBLEM TO BE SOLVED: To obtain a stably preservable frame-retardant-containing polyol compounding agent having satisfactory storage stability, providing a rigid urethane foam excellent in mechanical properties and thermal properties. SOLUTION: This frame-retardant-containing polyol compounding agent having storage stability comprises at least one polyol, optionally a relatively high-molecular weight compound containing at least two reactive hydrogen atoms, optionally a low-molecular weight chain extender and/or a cross-linking agent, a blowing agent, a catalyst, a stabilizer and optionally an auxiliary agent and/or an additive. In this case, the stabilizer used is an imidazole shown by the formula (R1 is an alkyl group, a hydroxyalkyl, etc.; R2 , R3 and R4 are each H, an alkyl group and/or formic acid). The compounding agent is reacted with an organic and/or a modified organic polyisocyanate to produce a rigid urethane foam derived from an isocyanate.
Abstract:
PROBLEM TO BE SOLVED: To obtain an isocyanate-based rigid foam having an open-cell type micro pore by making an polyisocyanate react with a compound having a plural ity of active hydrogen atoms capable of reacting with the isocyanate in the presence of a water foaming agent, a catalyst, an auxiliary and an additive. SOLUTION: A polyisocyante is made to react with a compound containing a plurality of hydrogen atoms capable of reacting with an isocyante such as a hydroxyl group-containing ester represented by the formula having a functionally of 2-8 and a molecular weight of 300-8,000 in the presence of water and, if necessary, an organic compound acting as a physical foaming agent, a catalyst, an auxiliary and an additive to produce an open-cell type rigid foam represented by the formula (wherein (m) is 1-15; (n), (p), (r) and (t) are each 0-1; (o), (q), (s) and (v) are each 0-15; (u) is 0-10; X is 1-5; Y is 1-4; Z is 0-3; Zi is 0.1-3; R1 and R3 have each an aliphtic structure not containing a polyalcoholic hydroxyl group; and R2 is a group not containing COOH group of a polycarboxylic acid.
Abstract:
The invention relates to prepolymers which contain isocyanate groups and which can be produced by reacting an isocyanate mixture, said mixture being predominantly comprised of diphenylmethane diisocyanates and polyphenyl polymethylene polyisocyanates, with a maximum proportion of two-core isomers of 74 wt.% with at least 4 functional polyols or with a mixture of polyols having an average functionality of at least 4. The polyols or polyol mixture comprise(s) a hydroxyl value ranging from 200 to 1650 mg KOH/g and an average molar mass of less than 1100 g/mol with an NCO content of at least 30.0 wt.%. In addition, the invention relates to a method for producing these prepolymers which contain isocyanate groups, to their use for producing polyurethanes, and to a method for producing polyurethanes by reacting at least one of the inventive prepolymers which contain isocyanate groups, optionally mixed with additional organic and/or modified organic isocyanates (a), with compounds having at least two reactive hydrogen atoms (b) in the presence of optional expanding agents (c), catalysts (d), optional additional auxiliary agents and/or additives (e).
Abstract:
Polyetherols based on solid initiator substances and liquid, hydroxyl-containing coinitiators are prepared by a catalyzed addition reaction of alkylene oxides by a process in which the initiator combination contains ethoxy structures, the ratio of the average number of hydroxyl groups per mole of initiator combination to the number of ethoxy structures in the polyetherol being from 1:0.2 to 1:1.8 and the ratio of the amounts by weight of the ethoxy structures to the average molecular weight of_the polyetherol being from 1:2 to 1:15. The polyetherols prepared by this process are used for the preparation of PUR, in particular rigid PUR foams.
Abstract:
A fireproofed isocyanate-based rigid foam (I) is obtd. by reacting (a) polyisocyanates and/or modified polyisocyanates with (b) cpd(s). contg. isocyanate-reactive H atoms and opt. (c) low molecular wt. chain extenders and/or crosslinkers, in presence of (d) blowing agents, (e) catalysts, (f) bromine-contg. fire retardant(s) and opt. (g) other additives, etc.. Fire retardant (f) is tribromo-neopentyl alcohol (TBNPA), and the crosslinking index of all the cpds. with NCO-reactive H atoms (including (f)) is at least 3.0. Also claimed is prodn. of the foam as above.
Abstract:
A fireproofed isocyanate-based rigid foam (I) is obtd. by reacting (a) polyisocyanates and/or modified polyisocyanates with (b) cpd(s). contg. isocyanate-reactive H atoms and opt. (c) low molecular wt. chain extenders and/or crosslinkers, in presence of (d) blowing agents, (e) catalysts, (f) bromine-contg. fire retardant(s) and opt. (g) other additives, etc.. Fire retardant (f) is tribromo-neopentyl alcohol (TBNPA), and the crosslinking index of all the cpds. with NCO-reactive H atoms (including (f)) is at least 3.0. Also claimed is prodn. of the foam as above.
Abstract:
In a process for producing open-celled rigid foams by reacting a) polyisocyanates with b) compounds containing hydrogen atoms which are reactive toward isocyanates, in the presence of c) water, d) if desired, organic compounds acting as physical blowing agents, e) catalysts, auxiliaries and/or additives, the compounds containing reactive hydrogen atoms used are substances having the structure I: where m is 0 - 15 n is 0 - 1 o is 0 - 15 p is 0 - 1 q is 0 - 15 r is 0 - 1 s is 0 - 15 t is 0 - 1 u is 0 - 10 v is 0 - 15 x is 1 - 5 y is 1 - 4 or mixtures of 1 - 3 where r + n ~ 0 z is 0 - 3 z i is 0.1 -3 R1 is an aliphatic structure without OH groups based on the structure of polyhydric alcohols, preferably ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol and dipropylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, 1,3-butanediol, trimethylolpropane, trimethylolethane, glycerol, pentaerythritol, where these substances can also be used in the esterification as any mixture among one another and R1 can therefore also be a mixture of the corresponding structures, R2 is the radical of a polycarboxylic acid without COOH groups, eg. adipic acid, terephthalic acid, o-phthalic acid, R3 is an alcohol radical like R1.
Abstract:
Se producen espumas rígidas ignifugas basadas en isocianato mediante la reaccion de a) poliisocianatos orgánicos y/u orgánicos modificados con b) cuando menos un compuesto que contiene átomos de hidrogeno que reaccionan con isocianatos y, si se desea c) extendedores de cadena de bajo peso molecular y/o agentes de reticulacion en presencia de d) agentes de expulsion, e) catalizadores f) cuando menos un pirorretardante que contiene bromo y, si se desea, g) auxiliares y/o aditivos adicionales, donde se emplea en forma predominante alcohol tribromoneopentílico como pirorretardante que contiene bromo y el índice de reticulacion de todos los compuestos que contienen átomos de hidrogeno que reaccionan con isocianatos, incluyendo el pirorretardante que contiene bromo, es de cuando menos 3.0. Las espumas rígidas basadas en isocianato y producidas de conformidad con este procedimiento pueden emplearse como materiales de aislamiento.