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 mg KOH/g、环/丙比例为4∶1、硅氧烷含量3%、丙烯酸酯的T_g为30~40℃、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。
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 waterborne 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, Tg of acrylate on the properties of waterborne epoxy dispersion were investigated. The results showed that the prepared waterborne 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 Tg of acrylate was 30-40℃.
出处
《涂料工业》
CAS
CSCD
北大核心
2017年第3期8-15,共8页
Paint & Coatings Industry
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
Tung oil acid
phosphoric acid
siloxane
grafting ratio
phase inversiontechnique
waterborne epoxy dispersion
