申请人:Bayer Corporation
公开号:EP0659792A2
公开(公告)日:1995-06-28
The present invention is directed to polyurethane moldings produced via the RIM process. These polyurethane moldings have excellent reactivity, demold properties (at a 30s demold), and good elongation and tear strength, and comprise the reaction product of an aliphatic polyisocyanate having a viscosity of less than about 20,000 mPa·s at 25°C and a NCO functionality of 2.3 to 4.0 with an isocyanate-reactive component comprising b1) a relatively high molecular weight organic compound containing at least one of the groups selected from the group consisting of hydroxy groups and amine groups; and b2) a low molecular weight chain extender selected from the group consisting of diols, triols, primary amines, secondary amines, aminoalcohols, and mixtures thereof; in the presence of a catalyst. The OH:NH ratio of the chain extender is from 1:1 to 25:1.
本发明涉及通过 RIM 工艺生产的聚氨酯模塑件。这些聚氨酯模塑物具有优异的反应活性、脱模性能(30 秒脱模)以及良好的伸长率和撕裂强度,由脂肪族多异氰酸酯与异氰酸酯反应产物组成,该异氰酸酯在 25°C 时的粘度小于约 20,000 mPa-s,NCO 官能度为 2.3 至 4.0。0 的异氰酸酯与异氰酸酯反应组分的反应产物,该反应组分包括 b1) 相对高分子量的有机化合物,其中至少含有一个选自由羟基和胺基组成的基团;和 b2) 低分子量的扩链剂,该扩链剂选自由二元醇、三元醇、伯胺、仲胺、氨基醇及其混合物组成的组。扩链剂的 OH:NH 比率为 1:1 至 25:1。