中文摘要：

以低聚物多元醇、异佛尔酮二异氰酸酯（IPDI）为主要原料，三羟甲基丙烷（TMP）为改性剂，合成了端羟基自乳化阳离子聚氨酯（PU）树脂，再以封端型六亚甲基二异氰酸酯（HDI）三聚体为交联剂，与其一同乳化制备电泳树脂，采用电泳工艺制备成膜。用“原位TF-IR”跟踪了交联剂的解封过程，研究了电泳涂料的固化过程。同时探究了TMP的用量、交联剂与PU树脂的比例、交联剂的解封温度、电泳工艺参数对漆膜性能的影响。结果表明：交联剂的解封温度为100℃；TMP在树脂中的质量分数为0．50％，-NCO与-OH的物质的量比为1．5：1，80℃烘烤30min后再在140℃下烘烤1h，电泳电压为60V时。能得到表观和性能优异的漆膜。

英文摘要：

An cationic polyurethane （ PU ） resin modified with trimethylolpropane （ TMP ） was synthesized from oligomer polyol, isophorone diisoeyanate （IPDI） as raw materials via self -emulsifying method, and further reacted with blocked hexamethylene diisocyanate （HDI） tri- mer as cross-linking agent to form a film by electrophoresis process. The deblock process of waterborne polyurethane crosslinking agent was detected by in-situ FT-IR, meanwhile, the curing process of electrophoretic coatings was investigated. Effect of the dosage of TMP, molar ratio of resin to cross- linking agent, deblock temperature of waterborne polyurethane crosslinking agent and process parameters on the appearance and properties of the film were in- vestigated respectively. It was found that the desirable property and appearance for the film could be obtained under the conditions that the mass fraction of TMP was about 0. 50% ; the molar ratio of --NCO and --OH was 1.5 ： 1 ; the deblock temperature of waterborne polyure- thane crosslinking agent was 100 ℃; the baking temperature and time were 80 ℃/30 min,140 ℃/1 h; and the electrophoresis voltage was 60 V.