摘要：

以甲基硅油为芯材、脲醛树脂为壁材,通过细乳液聚合法制备脲醛树脂(PUF)/硅油微胶囊,探究了微胶囊的形成机理及乳化剂、搅拌速度对微胶囊的影响。通过光学显微镜(OM)、扫描电子显微镜(SEM)、热重分析(TGA)、红外光谱(FT-IR)等手段表征了微胶囊的形貌、热力学及价键结构等性能。结果表明:用细乳液聚合法成功制备了表面光滑、粒径分布均匀的微胶囊;微胶囊包覆率达到91%,且具有良好的缓释效果。将制得的微胶囊掺杂到丙烯酸锌树脂中制备防污涂层,研究了防污涂层的防污性能。采用SEM分析了防污涂层的形貌,并通过接触角测试及防污试验考察了防污涂层的疏水性及抑菌抑藻效果。结果表明:防污涂层表面形成类似荷叶表面的微纳米结构,涂层的疏水性增加,接触角由98.2°增加到123.9°;在抗藻抗菌类试验中显示出良好的防污性能。

关键词: 微胶囊, 细乳液聚合法, 微纳米结构, 缓释性能, 防污

Abstract:

Poly(urea-formaldehyde)(PUF) microcapsules loaded with silicone oil as core material were prepared by mini-emulsion method. The formation mechanism of microcapsules, the effects of the emulsifier and agitation speed on the characters of microcapsules were explored. The morphology, thermodynamic performance and valence bond structure of microcapsules were investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and infrared spectroscopy (FT-IR), etc. The results showed that the microcapsules with smooth surface and uniform particle size distribution were successfully obtained by mini-emulsion method. The oil content reached 91% by measuring the TG-DTG curve, and the microcapsules showed a good slow-releasing performance. The prepared microcapsules as anti-fouling agents were embedded into the zinc acrylate resin and the anti-biofouling performance of the coating was studied. The morphology of antifouling coating was analyzed by SEM. The hydrophobicity and antifouling effect of the coating were investigated by testing the contact angle and antifouling experiments. The results showed that the morphology of the antifouling coating was similar to the surface microstructure of lotus leaf, which increased the hydrophobicity of the coating, meanwhile, the contact angle of the coating increased from 98.2° to 123.9°. The antifouling coating showed a good antifouling performance as observed by the test of anti-algae and anti-microbial experiments.

Key words: microcapsules, mini-emulsion, microstructure, releasing property, antifouling

中图分类号: 

• TQ637.3