The present invention is directed to a process for the production of optionally cellular, polyurethane elastomer moldings by reacting a reaction mixture containing
1) a polyisocyanate,
II) an isocyanate-reactive polymer having a molecular weight of about 1800 to 12 000,
III) about 5 to 50% by weight, based on the weight of component (II) of a chain extender comprising a sterically hindered aromatic diamine and
IV) an internal mold release agent mixture comprising
a) about 0.5 to 10% by weight, based on the weight of components (11) and (111) of a zinc carboxylate containing 8 to 24 carbon atoms per carboxylate group and
b) .a compatibilizer comprising a member selected from the group consisting of nitrogen-containing, isocyanate-reactive. acyclic compounds and nitrogen-containing, isocyanate-reactive polymers in an amount sufficient to solubilize the zinc carboxylate so that when the internal mold release agent mixture is in admixture with components (11) and (111), the zinc carboxylate posseses improved resistance to precipitation, the reaction mixture being processed as a one-shot system by the RIM process at an isocyanate index of about 70 to 130.
本发明涉及一种生产可选蜂窝状聚
氨酯弹性体模塑件的工艺,其反应混合物中含有
1) 一种多
异氰酸酯
分子量约为 1800 至 12 000 的
异氰酸酯反应聚合物、
III) 以组分(II)重量为基准,约 5%至 50%(按重量计)的由立体受阻芳香族二胺组成的扩链剂和
IV) 内脱模剂混合物,包括
a) 以组分(11)和(111)的重量为基准,约 0.5 至 10%(以重量计)的
羧酸锌, 每个
羧酸基含有 8 至 24 个碳原子,以及
b) .一种相容剂,该相容剂包括从含氮、
异氰酸酯反应性无环化合物和含氮、
异氰酸酯反应性聚合物组成的组中选出的成员,其用量足以溶解
羧酸锌,从而当内部脱模剂混合物与组分(11)和(111)混合时,
羧酸锌具有更好的抗沉淀性,反应混合物通过 RIM 工艺在
异氰酸酯指数约为 70 至 130 的条件下作为一次性系统进行加工。