1. Lanzhou University of Technology School of Materials Science and Engineering， Lanzhou 730050；
2. Lanzhou University of Technology China State Key Laboratory of Advanced Processing and
Recycling of Non-ferrous Metals， Lanzhou 730050； 3. State Key Laboratory of solid lubrication，
Lanzhou Institute of Chemical Physics， Chinese Academy of Sciences， Lanzhou 730050
Abstract: A waterborne epoxy phosphate emulsion was prepared by self-emulsifying method using 85％ phosphoric acid and E51. The structure of the E51 and the product were characterized by Fourier transform infrared spectroscopy （FT-IR）. The change of its properties such as viscosity， hardness， coating adhesion and boiling resistance were studied under different conditions. Meanwhile， the effects of various factors such as free phosphoric acid， monophosphate and bisphosphonates on the properties of the product were investigated. The results showed that a large amount of hydrophilic groups were introduced into the reaction product， and the product had good water dispersibility. When the molar ratio of hydroxyl group of phosphoric acid to epoxy group was 3∶2 and the viscosity of the product was 2 326 mPa·s， the comprehensive performance of waterborne epoxy phosphate emulsion was the best. When the monophosphate was higher， the adhesion and boiling resistance of the product-based coating on the metal substrate are improved.