有机硅改性丙烯酸酯乳液制备超疏水涂料的试验研究

Experimental Study on Preparation of Superhydrophobic Coatings by Silicone Acrylate Emulsion

摘要: 为了研究改性丙烯酸酯乳液的疏水性能，制备出超疏水性能良好的涂料。本论文采用具有一定疏水性的甲基丙烯酸正丁酯(MMA)与苯乙烯为原料作为单体，将乙烯基三乙氧基硅烷(VTES)作为改性剂，采用半连续混合法制备了有机硅丙烯酸酯乳液，并以此作为成膜物质，加入各种助剂制备超疏水自清洁涂料，以FT-IR分析、SEM、稳定性分析、固含量测量、吸水量测量对乳液进行表征，进一步研究乳化剂和引发剂的含量对丙烯酸酯乳液的影响，测试了由丙烯酸酯乳液制备的涂料性能。结果显示，当乳化剂、引发剂含量分别为7%、0.3%时，有机硅丙烯酸酯乳液的固含量最优；当乳化剂、引发剂含量分别为总体含量的5%、0.3%时，有机硅丙烯酸酯乳液的吸水量最低，乳液的稳定性最好，以此有机硅改性丙烯酸酯乳液为成膜物质制备涂料，其接触角达到163˚，具有超疏水效果，且涂料的其他性能均能满足相关规范要求。

Abstract: In order to study the hydrophobicity of modified acrylate emulsion, a coating with good superhydrophobicity was prepared. In this paper, n-butyl methacrylate (MMA) and styrene are used as raw materials as monomers. The silicone acrylate emulsion was prepared by semi-continuous mixing method by adding VTES into the modifier, and it was used as a film-forming substance. The superhydrophobic self-cleaning coating was prepared by adding water-based additives. The emulsion was characterized by FT-IR analysis, SEM, stability analysis, solid content measurement and water absorption measurement. The influence of the content of emulsifier and initiator on acrylate emulsion was further studied, and the performance of coating prepared by acrylate emulsion was tested. The results showed that when the emulsifier and initiator contents were 7% and 0.3%, respectively, the solid content of the silicone acrylate emulsion was optimal; when the emulsifier and initiator contents were 5% and 0.3% of the total content, the organic silicone acrylate emulsion has the lowest water absorption and the best emulsion stability. The silicone-modified acrylate emulsion is used as a film-forming substance to prepare coatings. When its contact angle reaches 163°, it has a super-hydrophobic effect, and other properties of the coating can meet the requirements of relevant specifications.