聚氨酯用环保型催化剂的性能及其动力学

Catalytic performance and kinetics of environment friendly catalysts for polyurethane

以二月桂酸二丁基锡为参照,研究了异辛酸铋、新癸酸铋、十三烷酸铋、异辛酸锌四种环保型催化剂对异氰酸酯与羟基反应的催化效果、相对选择性及投料顺序的影响,并研究了不同催化剂的反应动力学。结果表明:四种环保型催化剂反应速率不同,存在两个反应阶段。在60℃条件下,第一阶段十三烷酸铋的催化效果更好,第二阶段异辛酸铋的催化效果更好。通过计算不同反应体系的活化能、活化焓和活化熵,揭示了四种环保型催化剂的一些催化性质。

The catalytic effect,relative selectvity,feeding sequence of isooctoate bismuth,bismuth neodecanoate,bismuth tridecanoate,and zinc isooctsnoate to reaction of isocyanate and hydroxyl group were studied by dibutyltin dilaurate.The reaction kinetics of different catalysts were studied.The results show that the reaction rates of four environmentally friendly catalyst are different,and there are two reaction stages.At 60℃,the catalytic effect of bismuth tridecanoate at the first stage is better,and the catalytic effect of isooctoate bismuth is better at the second stage.Some catalytic properties of four environmentally friendly catalysts are revealed by calculating the activation energy,activation enthalpy and activation entropy of different reaction catalyst systems.