用于自修复涂料的微胶囊的研制

Development of Microcapsules for Self-Healing Coatings

通过试验确定了用于自修复涂料的微胶囊制备工艺条件,成功制备了微胶囊产品。采用多种检测手段对微胶囊进行表征,通过FT-IR确定微胶囊结构,利用SEM确定微胶囊为球状结构,平均粒径<50μm;采用水性羟基丙烯酸树脂作为主体,配合水性异氰酸酯固化剂,添加适量的助剂,再加入所制备的微胶囊,得到了微胶囊基水性涂料。采用光学显微镜对涂层进行观察发现,微胶囊可均匀分散在涂层中,无团聚现象。对涂层性能测试结果表明,微胶囊的加入对涂层的性能无明显不利影响;通过实验验证发现,对自修复涂层进行破坏,经过12 h的自修复,划伤处开始愈合,达到3级效果,具有良好的自修复功能。

The preparation conditions of microcapsules for self-healing coatings were determined by experiments to prepare the microcapsules successfully. The microcapsules were characterized by a variety of detection methods. The structure of microcapsules was determined by FTIR, and the spherical structure was determined by SEM. The average particle size was less than 50 μm.The microcapsule-based waterborne coating was prepared by using waterborne hydroxy acrylic resin as matrix resin, waterborne isocyanate as curing agent in addition to addtives and the prepared microcapsules. The results of photo microscope showed that the microcapsules were evenly dispersed in the coating without agglomeration. The test results of film performance showed that the addition of microcapsules had no obvious adverse effect on the performance of the coating. In addition, the damaged coating with scratch began to heal after 12 hours, which showing good self-healing function.