High resilience flexible foamed polyurethanes, foamable mixtures and process therefor
申请人:BASF WYANDOTTE CORPORATION
公开号:EP0003210A1
公开(公告)日:1979-08-08
A flexible, highly resilient, cold-cure, closed-mold polyurethane foam can be produced by reacting a foamable mixture comprising an organic isocyanate, water and a polyol. The foams of the invention are preferably prepared from a mixture of a hydroxyl-terminated graft copolymer and a hydroxyl-terminated polyoxyalkylene polyether in the presence of a co-catalyst mixture of at least one tertiary amine catalyst and at least one metal-containing basic catalyst. Said catalyst is selected from the group consisting of an alkali metal hydroxide, an alkaline earth metal hydroxide, an inorganic basic salt thereof derived from the reaction of said hydroxides with a weak inorganic acid, a metal organic basic salt catalyst derived from the reaction of at least one of said hydroxides with an organic acid and mixtures thereof. Useful metal organic catalysts are selected from the group consisting of the alkali and alkaline earth metal carboxylates, alkoxides and phenates. Useful inorganic basic metal salt catalysts are sodium bicarbonate and sodium carbonate.
通过对由有机异氰酸酯、水和多元醇组成的可发泡混合物进行反应,可生产出柔性、高回弹性、冷固化、闭模聚氨酯泡沫塑料。本发明的泡沫最好由羟基封端接枝共聚物和羟基封端聚氧亚烷基聚醚的混合物在至少一种叔胺催化剂和至少一种含金属的碱性催化剂的助催化剂混合物存在下制备而成。所述催化剂选自碱金属氢氧化物、碱土金属氢氧化物、由所述氢氧化物与弱无机酸反应生成的无机碱性盐、由至少一种所述氢氧化物与有机酸反应生成的金属有机碱性盐催化剂及其混合物组成的组。有用的金属有机催化剂选自碱金属和碱土金属羧酸盐、烷氧基化物和苯酸盐组成的组。有用的无机碱金属盐催化剂是碳酸氢钠和碳酸钠。