申请人:GAF CORPORATION
公开号:EP0102203A1
公开(公告)日:1984-03-07
A chain extending agent for reaction injection molding (RIM) comprising a normally liquid blend of butanediol and a toluene diamine mono-substituted with an electron withdrawing group and having the formula
wherein X is vicinal to an amino radical and is selected from the group of halogen, CN, N02, acyl, carboxylate and isomeric mixtures thereof, and wherein the butanediol and diamine are combined in a critical mole ratio of from 4:1 to about 19:1. The above blend is particularly useful in the preparation of large moldings of polyurethane-polyurea elastomer by the RIM or RRIM (reinforced reaction injection molding) process wherein instant preformed blend is added to a mixture of polyol reactant and catalyst before polymerization in the mold with isocyanate to produce a urethane/ urea polymer product of improved properties. Accordingly, the invention also concerns an enhanced RIM or RRIM process and improved product by the use of a mixture of the present chain extender blend and polyol reactant maintain- able in the liquid state at ambient temperature.
一种用于反应注塑成型(RIM)的延链剂,由丁二醇和单取代了一个取电子基团的甲苯二胺的常液态混合物组成,其式为
其中 X 与氨基邻接,选自卤素、CN、N02、酰基、羧基及其异构混合物,丁二醇和二胺的临界摩尔比为 4:1 至约 19:1。上述混合物特别适用于通过 RIM 或 RRIM(增强反应注塑成型)工艺制备聚氨酯-聚脲弹性体的大型模塑件,其中在模具中与异氰酸酯聚合之前,将即时预制的混合物添加到多元醇反应剂和催化剂的混合物中,以生产性能更好的聚氨酯/脲聚合物产品。因此,本发明还涉及一种增强型 RIM 或 RRIM 工艺,以及通过使用本扩链剂混合物和多元醇反应剂在环境温度下保持液态的混合物而改进的产品。