摘要： 先在环氧树脂中引入桐油酸、磷酸，再通过丙烯酸酯单体与产物共聚，从而提高了硅氧烷、丙烯酸酯单体与环氧树脂的接枝率。结合相反转技术，实现以较低的酸值合成高固含量的水性环氧分散体，提高了其漆膜在大多数底材表面的附着力。 系统研究了桐油酸含量、磷酸含量、酸值、环/ 丙比例(环氧树脂与丙烯酸酯单体的质量比)、硅氧烷含量、丙烯酸酯的 T_g 对水性环氧分散体及性能的影响。 结果表明:当桐油酸含量为 4%、磷酸含量 0 8%、酸值为30 mgKOH/ g、环/ 丙比例为 4 ∶1、硅 氧烷含量 3%、丙烯酸酯的 T_g 为 30~40 °C、HEA 占丙烯酸酯单体的比例为 5%时，获得的水性环氧分散体和漆膜的综合性能最佳。

关键词: 桐油酸, 磷酸, 硅氧烷, 接枝率, 相反转技术, 水性环氧分散体

Abstract: The tung oil acid and phosphoric acid were introduced into the epoxy resin and then copolymerized with acrylate monomer, which could greatly improve the grafting efficiency of siloxane and acrylate monomer with the modified epoxy resin. By means of phase inversion technique, the waterbome epoxy dispersion having high solid content was synthesized via a lower acid value. In addition, the adhesion of the film on various substrates was improved.The effects of tung oil acid content, phosphate content, acid value, epoxy/acrylate ratio, siloxane content, T_g of acrylate on the properties of waterbome epoxy dispersion were investigated. The results showed that the prepared waterbome epoxy dispersion and the film thereof had good comprehensive properties when the content of tung oil acid was 4%, the content of phosphate was 0.8%, the acid value was 30 mgKOH/g, the ratio of epoxy and acrylate was 4:1,the content of siloxane was 3%, and the T_g of acrylate was 30~40 ℃.

Key words: Tung oil acid, phosphoric acid, siloxane, grafting ratio, phase inversion technique, waterborne epoxy dispersion