氧化石墨烯包裹PGMA微球用于增强水性环氧树脂的防腐性能
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安徽大学化学化工学院与安徽省水基高分子材料高性能化工程实验室,安徽 合肥 230601

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国家自然科学基金资助项目(51973001);安徽省科技计划重点项目(1704a0902018)


Graphene oxide coated PGMA microspheres used to enhance the corrosion resistance of waterborne epoxy resin
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    摘要:

    以甲基丙烯酸缩水甘油酯(GMA)自由基聚合反应合成聚甲基丙烯酸缩水甘油酯(PGMA);利用生物基原料赖氨酸(Ly)作为桥梁,将氧化石墨烯(GO)与PGMA 连接,合成表面包裹氧化石墨烯的PGMA微球(PLGO),用于制备水性环氧复合涂料。 产物的结构经FTIR、XPS、XRD和SEM表征证实,GO成功包裹PGMA微球;通过电化学、盐雾实验对水性环氧涂层的防腐性能进行测定。结果表明:当添加0.3wt% PLGO时(添加量以环氧树脂和固化剂总质量为基准,下同)的水性环氧防腐涂层具有最优异的耐腐蚀性,缓蚀效率可达到86.46%,与纯EP相比,腐蚀电流密度从2478.75nA·cm-2减小至335.46nA·cm-2,腐蚀电压从-0.88V升高至-0.53V,低频阻抗值提高了约4个数量级。

    Abstract:

    Glycidyl methacrylate (PGMA) was synthesized by radical polymerization of glycidyl methacrylate (GMA); Using lysine (Ly) as a bridge, graphene oxide (GO) was connected with PGMA, and PGMA microspheres (PLGO) coated with graphene oxide were synthesized for the preparation of waterborne epoxy composite coatings. The structure of the product was confirmed by FTIR, XPS, XRD and SEM. GO successfully wrapped PGMA microspheres; The corrosion resistance of waterborne epoxy coating was measured by electrochemical and salt spray experiments. The results show that when 0.3wt% plgo is added (the amount is based on the total mass of epoxy resin and curing agent, the same below), the waterborne epoxy anti-corrosion coating has the best corrosion resistance, and the corrosion inhibition efficiency can reach 86.46%. Compared with pure EP, the corrosion current density is reduced from 2478.75nA·cm-2 to 335.46nA·cm-2, the corrosion voltage is increased from -0.88V to -0.53V, and the low-frequency impedance value is increased by about 4 orders of magnitude.

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  • 收稿日期:2022-07-11
  • 最后修改日期:2022-12-05
  • 录用日期:2022-12-08
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