目的 研制具有低温固化性能的长效耐候船用丙烯酸聚氨酯面漆。方法 采用聚天门冬氨酸树脂对羟基丙烯酸树脂进行改性，配合使用受阻胺光稳定剂与紫外光吸收剂作为体系光稳定剂，选用改性高分子不饱和羧酸盐类分散剂、氟改性聚丙烯酸酯类流平剂、聚酰胺蜡类触变防沉剂，配合使用湿法绢云母、钛白粉、重晶石粉作为体系颜填料。结果 通过控制天门冬氨酸树脂NH1420的不同添加量与优化助剂体系、颜填料体系，涂料体系在-5 ℃环境下表干55 min，实干时间14 h，24 h可复涂，放置10 d后，漆膜硬度可达2H，涂层具有良好的长效耐候性能。结论 聚天门冬氨酸树脂有效改善了丙烯酸聚氨酯面漆的低温固化性能，配合使用受阻胺光稳定剂与紫外光吸收剂，提高了涂层的耐候性。研制的船用低温固化丙烯酸聚氨酯防腐蚀涂料具有良好的低温固化性能、机械性能、耐腐蚀性能与耐候性。

The work aims to develop long-acting weather-proof marine acrylic polyurethane anti-corrosive finishing coating of low-temperature curing performance. Hydroxy acrylic resin was modified by poly-aspartic resin. Hindered amine light stabilizer and ultraviolet absorbent were jointly used as system light stabilizer, modified macromolecular unsaturated carboxylate as dispersant, fluorine-modified polyacrylate as flatting agent, and polyamide wax as thixotropic anti-sediment agent. Wet sericite, titanium dioxide and blanc fixe were co-used as system pigments and fillers. By controlling different additive amounts of aspartic acid resin NH1420 and optimizing additive system as well as pigment and filler system, surface curing time could be 55 minutes, hard drying time could reach 14 hours, then the paint system could be applied in 24 h, film hardness could be up to 2H after being placed for 10 days at -5 ℃, and the coating exhibited excellent long-acting weathering performance. The addition of polyaspartic acid resin can improve low temperature curing performance of acrylic polyurethane finish paint, and coordinated application of hindered amine light stabilizer and ultraviolet absorbent can improve weather resistance of the coating. The marine low-temperature curing acrylic polyurethane anti-corrosive coating exhibits excellent low temperature curing performance, mechanical property, corrosion resistance and weather resistance.