目的 制备一种低VOC、低毒性的水性环氧树脂涂料。方法 通过N,N-二甲基乙二胺与环氧树脂E51反应，然后利用冰乙酸中和成盐，制得一种反应型水性环氧树脂乳化剂，再与环氧树脂E51及四种胺类固化剂（651、GT19、DL19、SG）按一定的比例混合搅拌均匀，于电极表面涂覆，固化成膜后封装。采用显微红外光谱仪（Micro-FTIR）表征乳化剂的结构，采用动态光散射粒度分析仪（ZETA）测试乳化剂乳化E51后得到的乳液粒径。通过电化学阻抗谱和极化曲线测试，研究四种固化剂固化成膜的水性环氧涂层在3.5% NaCl溶液中的耐蚀性。结果 当乳化剂与E51的质量比为1∶1时，乳液平均粒径最小为52 nm，分布最均匀，体系最稳定。用固化剂651固化得到的涂层硬度最高，附着力最强，交联密度最高，涂层断面较为致密，在浸泡60 h后，仍具有较高的阻抗模值5.23×104 Ω×cm2和较低的自腐蚀电流密度2.0×10-7 A/cm2，对基底具有较好的腐蚀防护作用。结论 制得的水性环氧树脂涂料对基底具有良好的防护性能，适用于环保型低VOC涂料领域。

The work aims to fabricate a new waterborne epoxy resin coating with low VOC and low toxicity. An aqueous epoxy resin emulsifier was prepared by reaction of epoxy E51 with N,N-dimethylethylenediamine and then neutralized to salt with glacial acetic acid obtain a reactive water-based epoxy emulsifier. Reactive water-based epoxy emulsifier was mixed with epoxy resin E51 and four types of amine-based curing agents (651, GT19, DL19, SG) based on certain proportion and then coated on the electrode surface and sealed after being cured to film. The structure of the emulsifier was characterized by Micro-FTIR spectrometer. The particle size of the emulsion obtained by emulsifying the emulsifier E51 was tested by a dynamic light scattering particle size analyzer (ZETA). Electrochemical impedance spectroscopy and polarization curve tests were conducted to study the corrosion resistance of four curing agent-cured waterborne epoxy coatings in 3.5% NaCl solution. When the mix proportion of emulsifier and E51 was 1∶1, the average size of emulsion was the minimum, distribution was uniform and the system was stable. The coatings obtained with 651 curing agent had the maximum hardness and the strongest adhesion. Cross-linking density was the highest and coating cross section was the densest. After immersed in 60 hours, the coating still had a higher impedance modulus value of 5.23×104 Ω×cm2 and a lower self-corrosion current density of 2.0×10-7 A/cm2, thus exhibiting significant anti-corrosion properties for the base carbon steel. The prepared waterborne epoxy resin coating has good protective performance for the steel substrates and is suitable for the field of environment-friendly low VOC coatings.