HAA system powder coating capable of improving pinhole defects on surface of coating

The invention discloses an HAA system powder coating capable of improving pinhole defects on the surface of a coating, belonging to the technical field of powder coatings. The composition raw materials of the HAA system powder coating contain a small-molecular water catching agent which is polyacrylic resin containing anhydride group functionality. According to the HAA system powder coating provided by the invention, acrylic resin containing anhydride groups is added into the HAA system powder coating and plays a role of a small-molecular water catching agent, so the escape of small-molecularwater due to heating is avoided, the defects of pinholes or craters and the like on the surface of a coating can be effectively improved, the gloss of the coating is not influenced, and the mechanicalproperties of the coating are improved; and thus, the HAA powder coating with low surface defects is obtained. 本发明公开了一种具有改进涂层表面针孔缺陷的HAA体系粉末涂料，涉及粉末涂料技术领域，其组成原料中含有小分子水捕捉剂，所述小分子水捕捉剂为含酐基官能度的聚丙烯酸树脂。本发明提出了一种HAA体系粉末涂料，是将含酐基的丙烯酸树脂添加到