Process for producing hard polyurethane foams with low heat...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/50 (2006.01) C08G 18/40 (2006.01) C08G 18/42 (2006.01) C08G 18/48 (2006.01) C08J 9/14 (2006.01)

Patent

CA 2257451

The description relates to a process for producing hard polyurethane foams with low heat conductivity from polyols and polyisocynates, foaming agents and possibly foaming auxiliaries, in which the hard polyurethane foam is obtained by reacting: A. a polyol component containing 1. at least one polyester polyol of a molecular weight of 100 to 30,000 g/mol with at least two hydrogen atoms reactive to isocyanates, 2. at least two hydrogen atoms reactive to isocyanates and compounds containing at least one tertiary nitrogen atom and with a molecular weight of 150 to 12,500 g/mol, 3. compounds containing at least two hydrogen atoms reactive to isocyanates with a molecular weight of 150 to 12,500 g/mol, 4. catalysts, 5. water, 6. foaming agents and 7. possibly auxiliaries and/or additives; with: B. an organic and/or modified organic polyisocyanate with an NCO content of 20 to 48 % wt. In addition, cyclopentane- blown hard foams with low heat conductivity and their use as intermediate layers for composite components and for foam-filling hollow spaces are described.

L'invention concerne un procédé de production de mousses de polyuréthane rigides à faible conductibilité thermique, à partir de polyols et de polyisocyanates, ainsi que d'agents porogènes et éventuellement d'auxiliaires de moussage. Ce procédé se caractérise en ce que la mousse de polyuréthane rigide est obtenue par réaction A) d'un constituant polyol contenant 1) au moins un polyol de polyester dont le poids moléculaire moyen est compris entre 100 et 30000 g/mole avec au moins deux atomes d'hydrogène réagissant aux isocyanates, 2) au moins deux atomes d'hydrogène réagissant aux isocyanates, ainsi qu'au moins des composés de poids moléculaire compris entre 150 et 12500 g/mole comportant un atome d'azote tertiaire, 3) au moins deux atomes d'hydrogène de poids moléculaire compris entre 150 et 12500 g/mole réagissant aux isocyanates, 4) des catalyseurs, 5) de l'eau, 6) des agents porogènes et 7) éventuellement des auxiliaires et/ou des additifs avec B) un polyisocyanate organique et/ou organique modifié avec une teneur en NCO comprise entre 20 et 48 % en poids. L'invention concerne en outre des mousses rigides à faible conductibilité thermique, ainsi que leur utilisation comme couche intermédiaire pour des éléments composites, ainsi que pour remplir des cavités de mousse.

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