Abstract: Methoxypolyethylene glycols (mPEG) was first modified with succinic anhydride to obtain carboxylic acid terminated mPEG(mPEG⁃COOH). Epoxy resin emulsifier was fabricated by mixing the mPEG⁃COOH with epoxy resin, and the stable aqueous epoxy resin emulsion was obtained by phase inversion technique. The emulsifier structure, particle size distribution and the emulsion stability were characterized by infrared spectroscopy, high performance liquid chromatography and particle size analyzer. The effects of the molecular weight of mPEG, the type of epoxy resin and the emulsifier concentration on emulsion stability were carefully studied. The results showed that aqueous epoxy emulsifier and waterborne epoxy emulsion were successfully prepared. The aqueous epoxy emulsion has a particle size distribution of 0.8~1.5 μm and good emulsion stability. The obtained cured films by reacting the emulsion and amine curing agent at room temperature showed good water resistance and pollution resistance. Its water absorption rate and water loss weight loss rate were 0.35% and 0.25%, respectively.

Key words: Emulsifier, Waterborne epoxy emulsion, Phase inversion, Water resistance

摘要： 采用丁二酸酐对聚乙二醇单甲醚(mPEG)进行改性，得到羧酸型mPEG⁃COOH，将mPEG⁃COOH与环氧树脂反应，得到水性环氧树脂乳化剂。环氧树脂乳化剂与环氧树脂混合，通过相反转技术，得到稳定的水性环氧树脂乳液。采用红外光谱、高效液相色谱、粒度分析仪等对该乳化剂的结构及环氧树脂乳液的稳定性、粒径分布等进行表征。研究了乳化剂合成时甲氧基聚乙二醇相对分子质量、环氧树脂相对分子质量、乳化剂浓度等对乳液稳定性的影响。结果表明，成功制备出了水性环氧乳化剂及水性环氧乳液。水性环氧乳液的粒径分布在0.8~1.5 μm，且乳液稳定性良好。该水性环氧树脂乳液与胺类固化剂室温固化后，所得涂膜具有较好的耐水、耐污性能，其吸水率和耐水失重率分别为0.35%和0.25%。

关键词: 乳化剂, 水性环氧, 相反转, 耐水性