三层核壳结构水性环氧-丙烯酸酯复合乳液的可控制备及耐腐蚀性  

Controlled Preparation and Anticorrosion Properties of Multilayer Core-Shell Waterborne Epoxy-Acrylate Composite Emulsion

作　　者：陈细芳 肖玉玲 刘如佳 张凯 Xifang Chen;Yuling Xiao;Rujia Liu;Kai Zhang(School of Chemistry and Chemical Engineering,Hubei Key Laboratory for Processing and Application of Catalytic Materials,Huanggang Normal University,Huangzhou 438000,China;College of Materials and Chemical Engineering,China Three Gorges University,Yichang 443002,China)

机构地区：[1]黄冈师范学院化学化工学院催化材料制备及应用湖北省重点实验室,湖北黄州438000 [2]三峡大学材料与化工学院,湖北宜昌443002

出　　处：《高分子材料科学与工程》2022年第12期1-10,共10页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(21808078)。

摘　　要：首先对环氧树脂进行改性,改性后的环氧树脂一端连有与丙烯酸酯类单体反应的双键,另一端保留可交联的环氧基,再运用结构设计思想,采用种子乳液聚合法制备了含改性环氧树脂丙烯酸酯聚合物(内核)-“惰性”丙烯酸酯(中间层)-含羧基丙烯酸酯聚合物(外壳)结构的稳定型水性环氧-丙烯酸酯复合乳液,并对乳液进行了结构表征和耐腐蚀性测试。结果表明,改性后环氧树脂与丙烯酸酯类单体成功发生了乳液聚合,制备的复合乳液既保留了环氧基又引入了羧基;含中间层的3层结构乳液的稳定性和涂膜耐腐蚀性优于相同配方的常规核壳乳液,设置的“惰性”中间层起到了预期作用;中间层质量分数对复合乳液涂膜耐腐蚀性有较大影响,当中间层质量分数为26%时,温度随机多频调制差示扫描量热分析方法计算出的中间层厚度为14.51 nm,涂膜在3.5%NaCl溶液浸泡7 d后|Z|0.01Hz为1.66×10^(4)Ω·cm^(2),经其涂膜覆盖的马口铁在3.5%NaCl溶液浸泡30 d后,马口铁表面铁元素含量仍保持95.29%。Acrylic acid modified epoxy resin containing terminal double bond with the partial retention of epoxide group was synthesized.A stable waterborne epoxy-acrylate composite emulsion containing modified epoxy resin acrylate polymer(core)-inert polyacrylate(intermediate layer)-carboxyl acrylate polymer(shell)was successfully prepared by emulsion copolymerization and characterized by structural design.And the corrosion resistance of the composite latex films was studied.The results show that there is a successful emulsion copolymerization between modified epoxy resin and acrylate monomer,and the obtained composite emulsion has the partial retention of epoxide group and introduced carboxyl group;the stability and corrosion resistance of the three-layer composite emulsion with intermediate layer are better than those of the conventional core-shell emulsion,and the set intermediate layer can indeed play an expected role;the mass fraction of intermediate layer has great influence on the corrosion resistance of coatings.When the mass fraction of intermediate layer is 26%,the thickness of the middle layer calculated by temperature random multi-frequency modulation DSC is 14.51 nm,|Z|0.01Hzis 1.66×10^(4)Ω·cm^(2)for the three-layer core-shell coatings after the 7d immersion of 3.5% NaCl solution,and the content of iron on tinplate remains 95.29% after immersed in 3.5% NaCl solution for 3 d,the coatings are peeled off to expose the steel surface.

关 键 词：水性环氧-丙烯酸酯复合乳液 结构设计 3层结构 中间层厚度 温度随机多频调制差示扫描量热分析 耐腐蚀性 

分 类 号：TQ316.334[化学工程—高聚物工业]