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
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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

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国家自然科学基金资助项目(21808078)


Controlled Preparation of Multilayer Core-Shell Waterborne Epoxy-Acrylate Composite emulsion and Its Anticorrosion Properties
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    摘要:

    首先对环氧树脂进行改性,使得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,(1)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。(2)含中间层的三层结构乳液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。(3)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DSC方法计算出中间层厚度为14.51nm,涂膜在3.5wt% NaCl 溶液浸泡7天后|Z|0.01Hz为1.66×104Ω?cm2,经其涂膜覆盖的马口铁在3.5wt% NaCl溶液浸泡30天后,马口铁表面铁元素含量仍保持95.29%。

    Abstract:

    In this study, 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) –inerent 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 showed that (1) there is successful emulsion copolymerization between modified epoxy resin and acrylate monomer, and the obtained composite emulsion has the partial retention of the epoxide group and the introduced carboxyl group.(2) The stability and corrosion resistance of the three-layer composite emulsion with the intermediate layer are better than those of the conventional core-shell emulsion, and the set intermediate layer can indeed play an expected role.(3)The mass fraction of intermediate layer has great influence on the corrosion resistance of coatings. When the mass fraction of intermediate layer was 26%, the thickness of the middle layer calculated by temperature random multi-frequency modulation DSC technology was 14.51 nm, the value of |Z|0.01Hzwas 1.66×104 Ω?cm2of the three-layer core-shell coatingsafter7days immersion of 3.5 wt% NaCl solution, and the content of iron on tinplate remained 95.29%after the samples were immersed in 3.5wt% NaCl solution for 30 days, the coatings were peeled off to expose the steel surfaces.

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  • 收稿日期:2022-04-11
  • 最后修改日期:2022-06-20
  • 录用日期:2022-06-20
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