采用无皂乳液聚合与溶液聚合的复合技术合成有机硅改性水性丙烯酸分散体(SMWAD),考察了甲基丙烯酸缩水甘油酯(GMA)、中和剂和有机硅对SMWAD黏度及涂层性能的影响,并采用红外光谱分析、粒径分析和热重分析对SMWAD进行表征。研究结果表明,GMA质量分数为0.3%左右、中和剂为三乙胺(TEA)、硅烷偶联剂为GX570且添加量为0.5%时,制备的SMWAD黏度适中,涂层的力学性能和耐水性优良。在该聚合工艺下,得到的SMWAD的粒径较小且分布较窄,平均粒径为159.8nm;所有丙烯酸酯类单体已聚合完全,硅烷偶联剂和丙烯酸酯类单体通过化学键合形成交联度适中的共聚体系,涂层展现出良好的热稳定性能。该SMWAD适用于各种钢结构、机械设备等金属表面的装饰涂装,展现出良好的应用前景。

Organosilicon-modified waterborne acrylic dispersion (SMWAD) was synthesized by soap free lotion polymerization and solution polymerization.The effects of glycidyl methacrylate (GMA),neutralizer,and organosilicon on the viscosity and coating properties of SMWAD were investigated.SMWAD was characterized using infrared spectroscopy,particle size analysis,and thermogravimetric analysis.The results showed that when the mass fraction of GMA was about 0.3%,the neutralizer was triethylamine (TEA),and the silane coupling agent was GX570 with the addition amount of 0.5%,the viscosity of the prepared SMWAD was moderate,and the mechanical properties and water resistance of the coating were excellent.Under this polymerization process,the resulting SMWAD exhibited a small particle size and a narrow particle size distribution,with an average diameter of 159.8nm.All acrylate monomers were polymerized completely,silane coupling agent and acrylate monomers were chemically bonded to form a moderate degree of copolymerization system,and the coating showed good thermal stability.The SMWAD is suitable for decorative coating on various metal surfaces such as steel structures and mechanical equipment,showing a good application prospect.