Method of preparing rigid polyurethane foam

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/14 (2006.01) B29C 44/34 (2006.01) C08G 18/18 (2006.01) C08G 18/20 (2006.01) C08G 18/40 (2006.01) C08G 18/48 (2006.01) C08G 18/66 (2006.01) C08J 9/30 (2006.01) C08L 75/04 (2006.01)

Patent

CA 2347709

A method of preparing a polyurethane foam having excellent heat insulating properties is provided. A method of preparing a rigid polyurethane foam from (1) an organic polyisocyanate comprising an aromatic polyisocyanate, (2) a polyol comprising a polyether polyol and/or polyester polyol, (3) a blowing agent, and (4) a surfactant, a catalyst and other auxiliaries, characterized in that the blowing agent (3) is cyclopentane and water, the polyol (2) is a polyether polyol and/or polyester polyol having poor compatibility with cyclopentane, and cyclopentane is mixed and dispersed ina polyol premix comprising the components (2) to (4).

On décrit un procédé de préparation d'une mousse de polyuréthanne présentant d'excellentes propriétés d'isolation contre la chaleur. Le procédé de préparation d'une mousse de polyuréthanne dure comprend l'utilisation des ingrédients suivants: (1) un polyisocyanate organique comprenant un polyisocyanate aromatique, (2) un polyol comprenant un polyol de polyéther et/ou un polyol de polyester, (3) un agent gonflant, et (4) un tensioactif, un catalyseur et d'autres adjuvants, et se caractérise par le fait que: l'agent gonflant (3) est du cyclopentane et de l'eau, le polyol (2) est un polyol de polyéther et/ou un polyol de polyester présentant une faible compatibilité avec le cyclopentane, et que le cyclopentane est mélangé et dispersé dans un mélange préalable contenant les ingrédients (2), (3) et (4).

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