防水涂料用环氧改性聚氨酯树脂的合成

Preparation of Polyurethane Modified by Epoxy Resin for Waterproof Coating

以环氧树脂（EP）为改性剂，以聚醚二元醇（N210）、甲苯二异氰酸酯（TDI）、1，4-丁二醇（BDO）、三羟甲基丙烷（TMP）为原料制备了改性聚氨醑树脂（PUE）；用红外光谱（FTIR）和热重分析（TC）对PUE涂膜的结构和热稳定性进行了表征；研究了NCO／OH摩尔比、环氧树脂种类及用量、扩链剂用量、交联剂用量对涂膜硬度、拉伸强度及断裂伸长率的影响．结果表明，环氧树脂的引入，提高了PU膜的硬度、拉伸强度及耐热性．当NCO／OH摩尔比为1．3～1．4，FA4用量为6％～7％，扩链剂BDO用量为6％～8％，交联剂TMP用量2．5％-3％，PUE涂膜的主要性能指标优于PU，均达到国标GB／T19250-2003的要求．

The polyurethane modified by epoxy resin are prepared using isocyanate （TDI）, polyether（N210）, 1,4- butanediol（BDO）, trimethylolpropane （TMP） and epoxy resin as main raw materials. The effects of total mole ratio of NCO/OH, the kinds and amount of epoxy resin, the amount of BDO and TMP on the performance of PU and PUE coating films are investigated. The structure and thermal stability were characterized by FTIR and TG respectively. The results show that the hardness, tensile strength of PUE coating film are better than that of PU when the total mole ratio of NCO/ OH is 1.3- 1.4, the amount of E44 is 6%-7%,the BDO is 6%-8%,the TMP is 2.5% - 3%. Also, the main performance of PUE coating films is accorded with the standard of GB/T19250-2003.