Study on Preparation of Waterborne Epoxy Emulsifier and Properties of Its Emulsion and Coatings
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(1H-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).
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