When isocyanate reacts with hydroxy compound ,the acidic catalyzer would be dropped into it ,which could slower the rise of the chain and control the reactin of the cross bonding.
pH值对异氰酸酯反应影响较大,一般异氰酸酯与羟基化合物反应添加酸性催化剂,可以起到减慢链增长,抑制交联反应进行的效果。
参考来源 - 水溶性聚氨酯表面活性剂的合成与性能研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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