UV cured film with excellent water resistance
UV固化成膜具有优异的耐水性
A recent work describes the synthesis of UV-curable waterborne Polyurethane–acrylate modified with hydroxyl-terminated polydimethylsiloxane.
The resistance of WPUA cured film to water was increased.
一项最新研究介绍了经由端羟基聚二甲基硅氧烷改性的UV固化水性聚氨酯丙烯酸酯的合成方法
该改性提高了水性聚氨酯丙烯酸酯(WPUA)固化膜的耐水性。
A series of UV-curable waterborne polyurethane–acrylate (WPUA) emulsions were synthesised by using isophorone diisocyanate (IPDI) as the hard segment, polybutylene adipate glycol (PBAG) and different dosages of hydroxyl-terminated polydimethylsiloxane (HTPDMS) as the soft segment, 2,2-dimethylolpropionic acid (DMPA) as hydrophilic chain extender, and pentaerythritol triacrylate (PETA) as the blocking agents.
技术人员将异佛尔酮二异氰酸酯(IPDI)做为硬段,聚丁烯己二酸乙二醇(PBAG)和不同剂量的端羟基聚二甲基硅氧烷(HTPDMS)做为软段, 2,2-dimethylolpropionic酸(DMPA)为亲水链扩链剂,季戊四醇三丙烯酸酯(PETA)作为阻断剂,合成了一系列的UV固化水性聚氨酯丙烯酸酯(WPUA)乳剂.
Increased water resistance
增加耐水性
Test results indicated that with increasing HTPDMS content in the WPUA, the particle size of the emulsion was increased significantly, while the absolute value of Zeta potential was increased slightly. The resistance of WPUA cured film to water was increased. The ultimate water absorption declined from 11.12 % to 6.81 % and the equilibrium time of water absorption extended from 50 h to more than 100 h.
测试结果表明，随着WPUA中HTPDMS含量的增加，乳液粒径明显增大，而Zeta界面动电势略有增加,从而提升了WPUA固化膜的耐水性.最终吸水率由11.12%降至6.81%，平衡吸水时间由50 h延长至100 h以上.
When the HTPDMS content of WPUA was 10.0 wt%, the water contact angle of the cured film was the largest at 114°, which indicated that the surface of the cured film has been changed from a hydrophilic surface to a hydrophobic one. Thermogravimetric analysis results showed that the initial decomposition temperature of WPUA film gradually increased with adding of HTPDMS, performing better thermal stability.
当HTPDMS中WPUA含量为10.0 %重量比时，固化膜的水接触角最大，为114°,表明固化膜已经由亲水表面变为疏水表面.热重分析结果表明，随着HTPDMS的添加，WPUA薄膜的初始分解温度逐渐升高，从而具有更好的热稳定性。
The study has been published in Progress in Organic Coatings, Volume 156, July 2021.
完整研究报告: Progress in Organic Coatings, Volume 156, July 2021.
备注:
英文原文引自: https://www.european-coatings.com/articles/2021/06/uv-cured-film-with-excellent-water-resistance
翻译:九维-VL. 翻译内容未经同意不得转载.
图源: Sourabh Yadav - Pixabay (symbol image) |
