摘要： 【目的】开发一种新型水性环氧复合涂料，解决因亲水基团的引入导致涂层硬度低与防腐性能不足的问题。【方法】通过异佛尔酮二异氰酸酯将亲水链段吐温 20接枝至环氧树脂（ E-44）合成具有与环氧树脂相似结构的乳化剂；系统优化乳化工艺参数，确定了乳化剂与环氧树脂质量比为 1. 2∶1、相反，转温度 50 ℃、搅拌速率 800 r/min；在此基础上，进一步探究了添加不同比例的石墨烯对涂层的屏蔽性与耐腐蚀性的影响。【结果】所制备的水性环氧乳液平均粒径达到纳米级，涂层硬度达 3H，附着力为 0级，表现出良好的综合性能。电化学测试表明，基础水性环氧涂层的腐蚀电流密度为 1. 348×10-6 A/cm2；当石墨烯添加量为 0. 8%时，涂层防腐性能最优，腐蚀电流密度进一步降至 1. 322×10-8 A/cm2。【结论】合成的乳化剂具有与环氧树脂相同的主体结构，可有效乳化环氧树脂并改善涂层硬度，而适量引入石墨烯能显著阻隔水分渗透，从而赋予水性环氧复合涂层优异的防腐性能，具备良好的应用前景。
关键词:
水性环氧树脂,
异氰酸酯,
乳化剂,
石墨烯,
防腐
Abstract: ［Objective］ Develop a novel waterborne epoxy composite coating to address theissues of low coating hardness and inadequate anti -corrosion performance caused by the introductionof hydrophilic groups.［Method］In this work，the hydrophilic segment Tween 20 was grafted onto epoxy resin（E-44）using isophorone diisocyanate to synthesize an emulsifier with a structure similar tothat of epoxy resin. The emulsification process parameters were optimized，determining that the mass ratio of emulsifier to epoxy resin was 1. 2∶1，the phase inversion temperature was 50 ℃，and the stirring rate was 800 r/min. On this basis，the impacts of adding graphene in different proportions on theshielding and corrosion resistance of the coating were further explored.［Results］The average particlesize of the prepared waterborne epoxy emulsion reached the nanometer scale. The coating film exhibited a hardness of 3H and an adhesion grade of 0，demonstrating excellent overall performance.Electrochemical tests indicated that the corrosion current density of the base waterborne epoxy coating was 1. 348×10-6 A/cm2. When the graphene content was 0. 8%，the coating exhibited optimal anti-corrosion performance，with the corrosion current density further decreasing to 1. 322×10-8 A/cm2.［Conclusion］The synthesized emulsifier had the main structural backbone similar to the epoxy resin， which effectively emulsified epoxy resin and improved the film hardness. The incorporation of an appropriate amount of graphene could significantly prevent water penetration，thereby endowingwaterborne epoxy composite coating with excellent anti-corrosion performance and promisingapplication prospects.
Key words:
waterborne epoxy resin；isocyanate；emulsifier；graphene；corrosion prevention
中图分类号:
曲春晓, 施雅娜, 时 祥, 谭倩雅, 张雄飞. 水性环氧复合涂料的制备及其防腐性能研究[J]. 涂料工业, 2026, 56(1): 27-34.
QU Chunxiao, SHI Yana, SHI Xiang, TAN Qianya, ZHANG Xiongfei. Research on the Preparation of Waterborne Epoxy Composite Coatings and Its Anticorrosion Performance[J]. Paint & Coatings Industry, 2026, 56(1): 27-34.