期刊
PROGRESS IN ORGANIC COATINGS
卷 181, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2023.107578
关键词
Waterborne polyurethane (WPU); Crosslinking; Tetramethylguanidine; Esterification; Dibromide
The driving force of material research is to pursue high performance and solve the dilemma of existing materials. A new crosslinking method using commercialized dibromide as a crosslinker and 1,1,3,3-tetramethylguanidine (TMG) as an esterification promoter is proposed in this study. This method reduces the content of carboxyl groups while realizing the crosslinking of waterborne polyurethane (WPU) films, resulting in improved waterproof and mechanical properties.
Pursuing high performance and solving the dilemma of existing materials are the driving force of material research. Waterborne polyurethane (WPU) is an environmentally benign material with excellent performance and wide use. However, due to its inherent hydrophilic groups, such as carboxyl, the waterproof and mechanical properties of its corresponding films have been seriously affected. To address this dilemma, herein we proposed a new crosslinking method by using commercialized dibromide as a crosslinker and 1,1,3,3-tetramethylguanidine (TMG) as an esterification promoter, to make the carboxyl groups of waterborne polyurethane and dibromide undergo esterification crosslinking reaction, which reduces the content of carboxyl groups while realizing the crosslinking of WPU films. The results show that the water absorption of WPU films crosslinked by this method is greatly reduced, the hydrophobic property (contact angle) is significantly improved, and the mechanical prop-erties are greatly enhanced. Meanwhile, to facilitate construction and commercial application, we designed a two-component WPU coating, and their corresponding films also show great hydrophobic and mechanical properties. In a word, the crosslinking method has the advantages of low cost, simple operation, high crosslinking efficiency and mild reaction conditions.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据