摘要： 采用原位无皂乳液聚合法,以改性纳米二氧化硅粒子为反应活性中心,取代传统乳液聚合中的乳化剂,以磷酸酯为功能单体合成了纳米二氧化硅/聚丙烯酸酯复合防锈乳液。结果表明:所制备的乳液反应体系稳定,乳液粒径约为100 nm,当纳米二氧化硅用量为主单体质量的4%~6%,磷酸酯功能单体用量为主单体质量的2%~4%时,乳液综合性能最佳。以该乳液为基料制备的水性防锈涂料防锈性能优异,经240 h耐盐雾试验测试,钢板表面无泡无锈蚀产生。

关键词: 纳米二氧化硅, 聚丙烯酸酯, 磷酸酯, 防锈乳液

Abstract: The nano-SiO₂ /Polycrylate compound antirust emulsion was synthesized through in-situ soap-free emulsion polymerization with modified nano-SiO₂ particles,instead of conventional emulsifiers, as the reactive center of the system and phosphate as the functional monomer. The results showed that the emulsion thus prepared reaction system was stable, the emulsion particle size was about 100 nm, and when the dosage of the nano-SiO₂ particles was 4%~6% and the phosphate functional monomer was 2%~4% of the main monomers(m/m),the emulsion presented the best comprehensive properties. The waterborne antirust coatings with this emulsion as binder showed the best performance, with no rusting and no blistering after salt spray test for 240 hours.

Key words: nano-SiO2 particles, polyacrylate, phosphate functional monomer, antirust emulsion