双组分热固型阴极电泳涂料的制备及其电泳工艺的优化  

Preparation of Two-Component Thermosetting Cathodic Electrophoretic Coatings and Optimization of Electrophoresis Process

作　　者：李翠苹[1] 李金艳[1] 罗明艳[1] 李再亮[1] 李再峰[1] 

机构地区：[1]生态化工国家重点实验室培育基地,青岛科技大学,山东青岛266042

出　　处：《涂料工业》2016年第4期29-33,共5页Paint & Coatings Industry

基　　金：国家自然科学基金资助项目(21176126);武汉市“黄鹤英才计划”资助项目

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FT-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30 min后再在140℃下烘烤1 h,电泳电压为60 V时,能得到表观和性能优异的漆膜。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.

关 键 词：电泳涂料 解封温度 三羟甲基丙烷 工艺参数 漆膜 

分 类 号：TQ630.4[化学工程—精细化工]