用二苯基甲烷二异氰酸酯合成单组分聚氨酯防水涂料

Preparation of one component polyurethane waterproof coating with MDI

介绍了用二苯基甲烷二异氰酸酯（MDI）合成单组分聚氨酯防水涂料,讨论了反应时间对预聚反应程度的影响、m（N-220）∶m（N-330）、预聚体中w（NCO）对涂料伸长率、拉伸强度的影响。并讨论了催化剂对涂料性能的影响及贮存稳定性等问题。实验结果表明预聚时间为4h,m（N-220）∶m（N-330）=8∶1,涂料w（NCO）=5%~6%,催化剂m（二月桂酸二丁基锡）∶m（原料）=0.03%对于本体系是适合的,添加除水剂更好地解决贮存问题。

In this paper,synthesis of one-component polyurethane waterproof coating using MDI was introduced,the effect of the reaction time on reaction degree was discussed.The effects of ratio of polyether diol（N-220）to polyether triol（330）on elongation and tensile strength were discussed as well as the effects of NCO content,catalysts on performance,and the stability during storage,etc.Experimental results showed the most suitable for this system：the reaction time is four hours,the ratio of N220/N330 is 8∶1,the NCO content is 5%~6%,the amount of catalyst is 0.3%.The problem of storage stability could be well settled by adding moisture scavenger.