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.
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)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
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)。
