摘要
【目的】改善因叔胺氢供体/NorrishⅡ型光引发剂的引入导致涂料耐黄变性变差的情况。【方法】设计并合成了具有自迁移能力的叔胺氢供体,与二苯甲酮/2-羟基−2-甲基−1-苯基−1-丙酮形成引发体系配置了一系列光固化涂料,系统研究了其迁移性及对涂层聚合速率、固化程度、抗氧阻聚性及耐黄变性的影响。【结果】成功合成了具有自发迁移至涂层表面能力的含氟叔胺型氢供体;与添加0.5%(质量分数,下同)二乙胺的光固化涂料相比,添加0.1%迁移型叔胺氢供体的涂料在70μm处的双键转化率提升至50%,涂层最终双键转化率提高了10%,显著缓解了氧阻聚;150 h紫外加速老化测试的涂层色差也由11.43降至7.10,叔胺氢供体用量的降低有效改善了涂层耐黄变性。【结论】迁移型氢供体通过其自发迁移能力,在低添加量下既能有效抑制涂层界面处的氧阻聚效应,也提升了涂层的耐黄变性。
[Objective]To improve the problem of reduced yellowing resistance of coatings caused by the introduction of tertiary amine hydrogen donors/Norrish type Ⅱ photoinitiators.[Methods]A tertiary amine hydrogen donor with self-migratory capability was designed and synthesized.This donor,in combination with benzophenone and 2-hydroxy-2-methyl-1-phenyl-1-propanone,formed an initiation system,which was employed to prepare a series of UV-cured coatings.The migration ability,along with its effects on the polymerization rate,degree of cure,oxygen inhibition resistance and yellowing resistance of the coatings,was systematically investigated.[Results]A fluorine-containing tertiary amine hydrogen donor,capable of spontaneously migrating to the coating surface,was successfully synthesized.Compared with UV-cured coatings containing 0.5%diethylamine,the coating with 0.1%migratory tertiary amine hydrogen donor achieved a double bond conversion rate of 50%at a depth of 70μm and a 10%increase in final double bond conversion rate,significantly alleviating the oxygen inhibition.After 150 h of accelerated UV aging,the color difference of the coating decreased from 11.43 to 7.10.The reduction in the amount of tertiary amine hydrogen donor effectively enhanced the yellowing resistance of the coating.[Conclusion]The migratory hydrogen donors,leveraging their inherent migration capabilities,could effectively suppress interfacial oxygen inhibition and concurrently enhance the yellowing resistance of coatings at low dosages.
作者
孙宇廷
朱乙
刘仁
SUN Yuting;ZHU Yi;LIU Ren(School of Chemical and Material Engineering,Jiangnan University,International Research Center for Photoresponsive Molecules and Materials,Wuxi,Jiangsu 214122,China)
出处
《涂料工业》
北大核心
2025年第7期1-7,共7页
Paint & Coatings Industry
关键词
叔胺氢供体
光固化
光引发剂
氧阻聚
耐黄变性
tertiary amine hydrogen donors
UV-curing
photoinitiator
oxygen inhibition
yellowing resistance
作者简介
通信作者:刘仁,邮箱:liuren@jiangnan.edu.cn。
