聚氨酯
固化(化学)
傅里叶变换红外光谱
溶剂
涂层
材料科学
化学工程
高分子化学
化学
有机化学
复合材料
工程类
作者
Ruitao Wang,Chunxiang Li,Liu Zhigang,Zhongping Yao,Wang Zhijiang,Zhaohua Jiang,Min Zhao
出处
期刊:Coatings
[MDPI AG]
日期:2020-05-09
卷期号:10 (5): 461-461
被引量:3
标识
DOI:10.3390/coatings10050461
摘要
Waterborne polyurethane coatings were prepared using polyhydroxyacrylate dispersion, polyisocyanate, and propylene glycol diacetate (PGDA). The rate of reaction between hydroxyl and NCO groups in film formation and curing processes was studied by FTIR. The influence of PGDA amount on film formation and curing was also studied. Results showed that PGDA content had a significant effect on the curing process. With less than 10% PGDA, the role of PGDA was more to assist diffusion of polyhydroxyacrylate and polyisocyanate resin droplets. This promoted the reaction between hydroxyl groups and NCO. With more than 10% PGDA, its effect as a solvent was more and it inhibited the reaction between hydroxyl and NCO groups. When the amount of PGDA was about 10%, the synergy between both the roles promoted the crosslinking and curing reactions. The extent of the curing reaction of NCO was more than 70% in 4 h, which was significantly higher, compared with that of about 30% without PGDA. The good applicability and appearance of the waterborne polyurethane coating prepared in this study were verified for the application to carbon fiber metro vehicles.
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