水性环氧丙烯酸接枝共聚物的合成及固化  

Study on the Synthesis and Curing of Waterborne Epoxy-acrylate Grafted Copolymers

作　　者：陈少鹏[1] 俞小春[1] 林国良[1] 

机构地区：[1]厦门大学化学化工学院材料科学与工程系,福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2007年第1期63-66,共4页Journal of Xiamen University：Natural Science

摘　　要：环氧树脂与丙烯酸类单体接枝共聚是制备水性环氧树脂的一条重要途径.本文作者研究了多元接枝水性环氧树脂的合成,及其与固化剂双氰胺的固化工艺.讨论了单体配比、接枝反应温度、反应时间等因素对水性环氧乳液接枝率的影响,确定了较佳的工艺条件,通过红外光谱分析证实了丙烯酸接枝环氧共聚物的结构,并考察了漆膜的固化条件.所得涂膜附着力、柔韧性、硬度很好,能达到溶剂型环氧树脂防腐蚀涂料水平.The waterborne multi-graft epoxy resin is based on epoxy resin as parents , and α-methacrylic acid ,styrene and butyl acrylate as grafted monomers with BPO as initiator ,the synthesis of grafting epoxy copolymer and its curing by dicyandiamide have been studied in this paper, The reaction conditions affecting the grafting ratio of emulsion, such as the ratio of grafting monomers. grafting reaction temperature and reaction time were discussed,The results showed that when the ratio of a-methacrylic acid/ styrene/ butyl acrylate was 15 ： 6 ： 4,grafting reaction temperature was 110℃-115℃, reaction time was 6h,the epoxy emulsion with most stability and highest grafting ratio would be obtainded. The structure of grafting epoxy copolymer is proved by analyzing infrared spectrum（IR）. The conditions of curing were also investigated. A series of coating films of different curing temperature and quantity of DICY were prepared,the optimum conditions of curing were determined by testing degree of cross linking of the coating films and the coating films properties. The results showed that when the curing technics was 140℃/1 h, and the mol ratio of epoxy group/ amino hydrogen of DICY was 1 ： 0.4,the coating films have good properties of adhesion, flexibility and hardness, and it reach the standard of corrosion resistant solvent-borne epoxy coatings.

关 键 词：环氧树脂 水性 接枝聚合 固化 

分 类 号：TQ21[化学工程—有机化工]