摘要
以甲基丙烯酸甲酯、丙烯酸丁酯、甲基丙烯酸二甲氨基乙酯、甲基丙烯酸羟乙酯、苯乙烯等作为功能性单体,通过自由基聚合反应合成丙烯酸基体树脂。通过异佛尔酮二异氰酸酯(IPDI)单体合成的异氰酸酯基(NCO)半饱和封闭物,与丙烯酸基体树脂进行接枝反应,在骨架中引入不饱和键,在紫外光和引发剂作用下制备出低温紫外光固化阴极电泳涂料。探讨了接枝比、活性稀释剂、光引发剂、闪蒸工艺、固化时间等对涂膜的影响,得到涂膜制备的最佳工艺条件:NCO半饱和封闭物与丙烯酸基体树脂接枝比例1∶0.7,活性稀释剂的质量分数为树脂总量的10%,光引发剂的质量分数为成膜物质的3%,闪蒸温度70℃,闪蒸时间5 min,紫外光照射60 s。涂膜性能优异,光泽度高,光滑平整,硬度高,抗冲击性能良好,适合工业化生产需要。
The acrylic matrix resin was synthesized by free radical polymerization using functional monomers such as methyl methacrylate,butyl acrylate,dimethylaminoethyl methacrylate,hydroxyethyl methacrylate,and styrene.A low-temperature ultraviolet-curing cathode electropcoating was prepared under the action of ultraviolet light and an initiator through the grafting reaction between the isocyanate semi-saturated block synthesized with isophorone diisocyanate monomer and acrylic resin,which can introduce unsaturated bonds into the skeleton.The effects of grafting ratio,active diluent,photoinitiator,flashing process and curing time on the coating were investigated.The optimum process conditions are as follows:the grafting ratio of isocyanate unsaturated block and acrylic resin is 1∶0.7,mass fraction of the reactive diluent is 10%of the total resin amount,mass fraction of the photoinitiator is 3%of the film-forming substance,flashing temperature is 70℃,flashing time is 5 min,and ultraviolet light irradiation is 60 s.The painted film shows excellent performance with high gloss,smoothness,high hardness,and excellent impact resistance,which is suitable for industrialproduction.
作者
刘茂松
张松鹏
程凯
韩禹
张诣
黎俊波
余响林
LIU Maosong;ZHANG Songpeng;CHENG Kai;HANG Yu;ZHANG Yi;LI Junbo;YU Xianglin(School of Chemical Engineering and pharmacy,Wuhan Institute of Technology,Wuhan 430205,China;Inner Mongolia Zhongan Engineering Technology Research Co.,Ltd,Hohhot 010000,China;School of Chemistry and Environmental Engineering,Wuhan Institute of Technology,Wuhan 430205,China)
出处
《武汉工程大学学报》
CAS
2023年第2期156-161,168,共7页
Journal of Wuhan Institute of Technology
基金
国家自然科学基金(51203127)。
