桐油酸改性含环氧基团聚丙烯酸酯乳液的制备

摘要：以丙烯酸丁酯（BA）、甲基丙烯酸甲酯（MMA）、丙烯酸羟乙酯（HEA）为主要单体，桐油酸和甲基丙烯酸缩水甘油酯（GMA）为功能性单体，采用半连续乳液聚合法制备了一系列桐油酸改性含环氧基团聚丙烯酸酯乳液（简称改性聚丙烯酸酯乳液）。通过FTIR表征胶膜的结构，同时测定了胶膜的力学性能、耐酸耐碱性等。结果表明：当桐油酸添加量（以MMA、BA、HEA、GMA的总质量为基准）为4%时，随着GMA含量（即GMA的质量占总丙烯酸单体质量的百分数，下同）的增加，胶膜铅笔硬度增大，耐水、耐酸碱性能增强，拉伸强度增大，热稳定性增加，胶膜附着力增加。当GMA含量为12%时，胶膜铅笔硬度为4H，涂在马口铁上的胶膜在5%的盐酸溶液中浸泡144 h无变化，在5%的氢氧化钠溶液浸泡72 h无变化，24 h的吸水率为3.31%，附着力为0级。

ZHU Ganggang,HUANG Yiping*,BAO Junjie,QUAN Qingqing,LIU Hao

Abstract:A series of tung oleic acid modified emulsion containing epoxy group polyacrylate emulsion (modified polyacrylate emulsion for short) were prepared by semi-continuous emulsion polymerization with butyl acrylate (BA), methyl methacrylate (MMA), hydroxyethyl acrylate (HEA) as the main monomer ,and tung oil acid and shrinkage glyceride methacrylate (GMA) as the functional monomer.The structure of the films was characterized by FTIR. The properties of the films were analyzed by mechanical properties, acid and alkali resistance test. The results show that when the content(based on the total mass of MMA, BA, HEA and GMA) of tung oleic acid is 4%, with the increase of GMA content(that is, the mass of GMA as a percentage of the total acrylic monomer mass, the same below), the hardness of the pencil increases, the water resistance, acid and alkali resistance increase, the tensile strength increases, the thermal stability increases, and the adhesion of the film increases. When the mass ratio of GMA is 12% in the total monomer mass, the hardness of the film pencil is 4H. The film coated on tinplate has no change in 5% hydrochloric acid solution for 144 h, no change in 5% sodium hydroxide solution for 72 h. The water absorption rate of 24h is 3.31% and the adhesion level is 0.