脂肪链硅氧烷超疏水涂层的制备及其影响因素

Preparation of Superhydrophobic Coating Based on Fatty Chain Siloxanes and the Influence Factors

采用分段控温投料的方式,通过简单的一锅法成功地合成了脂肪链硅氧烷分散液,并制备了基于玻璃表面的超疏水涂层,涂层的水接触角和滚动角分别可以达到158°和2°。研究了催化剂、水及脂肪链硅氧烷的浓度和反应时间对涂层形貌和润湿性能的影响,脂肪链硅氧烷的引入可同时为涂层提供多级粗糙结构和低表面能基团。此外,在含水量低的条件下,随着催化剂含量、含水量和脂肪链硅氧烷含量的增加,涂层的超疏水性得到改善。然而,过多的催化剂或水或长链硅氧烷的加入会导致涂层破裂,由此可确定分散液合成的最佳反应条件。

A kind of fatty chain siloxane dispersion was successfully synthesized by segmentally controlling temperature and feedingvia two-stage temperature control and feeding, and the associated coating was fabricated on glasses. The water contact angle and the rolling angle of the coatings could reach to 158° and 2°, respectively. Besides, the effects of the concentration of catalyst, water and siloxanes as well as and the reaction time on the morphology and wettability of the coating were investigated. With low water content, the superhydrophobicity of the coating is improved with the increase of catalyst content, water content and the content of catalyst, water and fatty chain siloxane. However, the excessively addition of excess catalyst, or water or long-chain siloxane could lead to cracking of the coating. Thereby the optimal reaction conditions for the synthesis of the dispersion could be determined. More importantly, the introduction of the fatty chain of siloxane could provide the coating with both hierarchical structure and low surface energy groups.