申请人:THE CELOTEX CORPORATION
公开号:EP0254097A2
公开(公告)日:1988-01-27
Rigid polyisocyanurate foams are prepared by (a) bringing together on a continuously advancing conveyor an organic polyisocyanate, a minor amount of a polyester polyol, a blowing agent and, in an organic solvent, a catalyst mixture comprising: (i) a salt of a low molecular weight carboxylic acid selected from the group consisting of an alkali metal salt and an alkaline earth metal salt and mixtures thereof, and (ii) a tertiary amine, the amount of the salt of the low molecular weight carboxylic acid being sufficient and the molecular weight of the carboxylic acid of the salt being sufficiently low to provide a firm foam having a nonfriable surface, and (b) foaming the foam-forming mixture.
硬质聚异氰脲酸酯泡沫的制备方法是:(a) 在连续推进的传送带上将有机多异氰酸酯、少量聚酯多元醇、发泡剂和在有机溶剂中的催化剂混合物混合在一起,催化剂混合物包括:(i) 低分子量羧酸盐,该盐选自碱金属盐和碱土金属盐及其混合物组成的组,以及 (ii) 三级胺,低分子量羧酸盐的用量要足够大,盐的羧酸分子量要足够低,以提供具有不易碎表面的坚固泡沫;(b) 将发泡混合物发泡。