基于双组分羟基丙烯酸清漆在较高温度干燥过程中,漆膜出现橘皮收缩、缩孔等缺陷,研究了羟基丙烯酸分散体羟值、多异氰酸酯固化剂对漆膜性能的影响,分析了体系黏度的影响因素,优化配方组成和施工过程,结果如下:1)羟基丙烯酸分散体选择羟值3.9%;2)3种多异氰酸酯组分复配,以水相容性较高的组分包裹水容性较低的组分,提高漆膜外观,优化漆膜干燥速度;3)A组分溶剂选择乙二醇丁醚与丙二醇丁醚复配,B组分的稀释溶剂选择丙二醇二乙酸酯;4)施工过程预先将A组分与B组分搅拌均匀再加去离子水;5)制备得到干燥速度快、光泽高的水性双组分羟基丙烯酸清漆,漆膜各项性能满足要求。

In order to reduce the defects such as shrinkage and shrinkage holes of the two-component hydroxyacrylic varnish film dried at higher temperature,the effects of hydroxy value of hydroxyacrylic dispersion and polyisocyanate curing agent on the properties of paint film were studied.The factors affecting the varnish viscosity were analyzed,and the varnish formulation and the construction process were optimized.The results were as follows:1)The hydroxyacrylic dispersion with a 3.9%hydroxy value was selected;2)Three kinds of polyisocyanate components were mixed,and the components with higher water compatibility were wrapped around the components with lower water compatibility to improve the appearance of the film and optimize the drying speed of the film;3)Ethylene glycol butyl ether and propylene glycol butyl ether were selected as solvents for component A,and propylene glycol diacetate was selected as dilution solvent for component B;4)In the construction process,the component A and component B were stirred evenly in advance and then deionized water was added;5)The waterborne two-component hydroxyacrylic varnish with fast drying speed and high gloss was prepared,and the performance of the varnish film was qualified.