A method for preparing polyurethane product by the reaction of an organic polyisocyanate with a polyester or polyether polyol in the presence of a catalytically effective amount of a catalyst system consisting essentially of a tertiary amine and 1 to 35 wt%, based on the tertiary amine, of an N-hydroxyalkyl quaternary ammonium carbonytate salt. The use of such catalyst system advantageously improves the cure time of the urethane reaction, when compared to a system containing solely a tertiary amine, while maintaining the same initiation of the reaction. This advantage can be transferred to a delay in the initiation time while maintaining or shortening the cure time by adjustments in the total amount of the catalyst system used.
一种通过有机多
异氰酸酯与聚
酯或聚醚多元醇在催化有效量的
催化剂体系存在下反应制备聚
氨酯产品的方法,该
催化剂体系主要由叔胺和 1 至 35 wt%(以叔胺为基准)的 N-羟基烷基季
铵盐组成。 与仅含叔胺的体系相比,使用这种
催化剂体系可在保持相同的反应起始时间的情况下,有利地改善聚
氨酯反应的固化时间。 通过调整
催化剂体系的使用总量,可将这种优势转化为延迟起始时间,同时保持或缩短固化时间。