水性环氧乳化剂的制备及其乳液和涂料性能研究

Study on Preparation of Waterborne Epoxy Emulsifier and Properties of Its Emulsion and Coatings

本文以柠康酸酐、衣康酸酐、聚乙二醇、环氧树脂为原料,不加催化剂合成了一种环保型环氧乳化剂,并通过相反转法制备了水性环氧树脂乳液,利用红外光谱仪、核磁氢谱仪、凝胶渗透色谱、激光粒度仪对乳化剂和乳液的结构和粒径分布进行表征,发现乳液粒径分布较窄且稳定性优异。利用该乳液制备水性环氧涂料,采用热重分析仪、扫描电镜、接触角测量仪对涂层进行了性能和形貌表征,并对涂层的常规性能和腐蚀性进行测试。结果表明水性环氧涂层其干燥时间为20 min (表干)和12 h (实干),涂层力学性能表现较优,挥发性有机化合物(VOC)含量是22 g/L,同时表现出优异的耐水性(1000 h)和耐腐蚀性(中性盐雾试验为800 h)。

A eco-friendly epoxy emulsifier was synthesized from citraconic anhydride,itaconic anhydride,poly(ethylene glycol)and epoxy resin without catalyst.The aqueous epoxy emulsion was prepared by phase inversion method.The structure and particle size distribution of the emulsifier and emulsion were characterized by nuclear magnetic resonance spectroscopy('H-NMR),infrared spectroscopy(IR),gel permeation chromatography(GPC)and laser particle size analyzer.It was found that the emulsion has narrow particle size distribution and excellent stability.The waterborne epoxy coating was prepared with the aqueous epoxy emulsion.The performance and morphology of the coating were characterized using a thermogravimetric analyzer,scanning electron microscopy,and contact angle measurement instrument,and the conventional performance and corrosiveness of the coating were tested.The results show that the drying time of the waterborne epoxy coating is 20 min(surface dry)and 12 h(solid dry),and the mechanical properties of the coating are excellent.The volatile organic compound(VOC)content is 22 g/L,and it exhibits excellent water resistance(1000 h)and corrosion resistance(800 h for neutral salt spray test).