Objective To improve the DOT4 braking-oil-resistance of polyacrylate/amino resin coating and retain its good shock resistance.Methods Polyacrylate resin with high acid value was synthesized with high molecular weight epoxy resin (E20) to prepare polyacrylate/amino resin coating by mixing,heating and curing with the polyacrylate resin.The braking-oil-resistance,adhesive force and shock resistance of the polyacrylate/amino resin coating were tested with high temperature soaking method,grid test and shock test of DOT4.Results The polyacrylate resin with acid value of 60 mgKOH/g and solid content of 60％ was synthesized successfully.When the ratio of polyacrylate resin to the amino resin equaled to 3∶1 and the concentration of E20 equaled to 4％ based on the sum of the mass polyacrylate resin and amino resin,the coating had the best combination property with adhesive force of 0 grade and shock resistance of 50 kg·cm.The coating could stand baking in DOT4 at 100 C for 7 h without exfoliating or blistering.Conclusion This method is suitable for improving DOT4 brake fluid resistance of acrylic amino paint.%目的 提高丙烯酸氨基烤漆的耐DOT4制动液性能,并保留其良好的耐冲击性能.方法 通过制备高酸价的丙烯酸树脂并与一定量的高分子量的环氧树脂(E20)共混改性后,与氨基树脂混合加热固化制备涂层,分别采用DOT4制动液高温浸泡法、划格法和冲击试验测涂层的耐制动液、附着力和耐冲击性能.结果 成功制备了酸价为60 mgKOH/g与固含量为60％高酸价丙烯酸树脂.当高酸价丙烯酸树脂以质量比为3∶1的比例与氨基树脂混合并加入4％的E20时制备的涂层具有优异的综合性能,涂层的附着力为0级,耐冲击性能为50 kg·cm,在100℃的DOT4制动液中浸泡7h后,涂层不脱落,不起泡.结论 该方法适用于提高丙烯酸氨基烤漆的耐DOT4制动液性能.
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