【摘要】 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 mg KOH/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7 h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。更多还原

【Abstract】 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 mg KOH/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 for 7 h without exfoliating or blistering. ℃ Conclusion This method is suitable for improving DOT4 brake fluid resistance of acrylic amino paint.更多还原