Polyurethane polymer polyols can be prepared by reacting a hydroxyl-containing amine (e.g. ethanol-amine), a polyetherpolyol having a molecular weight of 2000 to 8000, and a less than stoichiometric amount of an organic polyisocyanate. The molar ratio of hydroxyl-containing amine to polyether polyol is from 0.5:1 to 3.5:1. The molar ratio of active hydrogen (in hydroxyl-containing amine and polyol) to isocyanate is from 1.4:1 to 3.5:1.
In a preferred embodiment, the stability of the polyurethane polymer polyols is enhanced by adding a secondary amine.
Polyurethane foams obtained by reacting the polyurethane polymer polyols with more polyisocyanate have generally better properties (e.g. tensile and tear strength, elongation and compression) than foams produced directly from hydroxyl-containing amine, polyether polyol and a stoichiometric amount of polyisocyanate.
                            聚
氨酯聚合物多元醇可通过使含羟基胺(如
乙醇胺)、分子量为 2000 至 8000 的聚醚多元醇和小于一定量的有机多
异氰酸酯反应制备。含羟基胺与聚醚多元醇的摩尔比为 0.5:1 至 3.5:1。活性氢(在含羟基胺和多元醇中)与
异氰酸酯的摩尔比为 1.4:1 至 3.5:1。
在一个优选的实施方案中,聚
氨酯聚合物多元醇的稳定性通过添加仲胺来提高。
通过聚
氨酯聚合物多元醇与更多的多
异氰酸酯反应得到的聚
氨酯泡沫的性能(如拉伸和撕裂强 度、伸长率和压缩率)通常优于直接由含羟基胺、聚醚多元醇和定量的多
异氰酸酯生产的泡沫。