为有效降低聚氨酯涂料中游离TDI含量,以甲苯二异氰酸酯(TDI)、三羟甲基丙烷(TMP)为原料,采用金属离子催化聚合法合成低游离TDI含量的聚氨酯固化剂.探讨了A101的催化机理,并计算了反应体系的活化能.结果表明:金属离子催化剂A101的催化效果最佳.合成的产品中TDI残留量低于0.05%,-NCO含量在6.0%～8.O%;粘度在20～26s,符合国家标准.计算表明:A101对TDI-TMP聚合反应体系有强的催化作用,大大降低了体系的活化能,加速了TDI与TMP反应.
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