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.

Key words: self-emulsification method, waterborne epoxy phosphate emulsion, phosphoric acid, epoxy resin

摘要：

以85%的磷酸和双酚A型环氧树脂(E51)为原料,采用自乳化法制备水性环氧磷酸酯乳液。采用傅里叶红外光谱(FT-IR)对反应前后物质的结构进行了表征。研究了产物在不同条件下的黏度、硬度、涂膜附着力、耐水煮性等性能的变化,探讨了游离磷酸、单磷酸酯和双磷酸酯等对产物性能的影响。结果表明:反应产物中引入大量的亲水基团,使产物具有良好的水可分散性;当磷酸羟基与环氧基的物质的量比为3∶2、产物黏度为2 326 mPa·s时,制备的水性环氧磷酸酯乳液的综合性能最好;当单磷酸酯含量较高时,有利于提高产物涂层与金属基底的附着力和耐水煮性。

关键词: 自乳化法, 水性环氧磷酸酯乳液, 磷酸, 环氧树脂

CLC Number: 

• TQ630.4