水性环氧富锌底漆的制备与性能研究

Preparation and Properties of Water-borne Zinc-rich Epoxy Primer

为开发新型水性富锌底漆,在开发具有优良水可稀释性能的水性固化剂基础上,研究了一种环境友好的双组分水性环氧富锌底漆。将锌粉等颜填料和各种助剂均匀分散于以乙醇为溶剂的水性环氧树脂固化剂中,制备出了稳定的固化剂组分;通过溶剂析出率测试和高速离心测试,对锌粉在水性环氧树脂固化剂中的稳定性进行了研究;通过对涂膜的防腐蚀性能的测试,研究了锌粉含量、粒径、形状对涂膜性能的影响;通过扫描电子显微镜(SEM)分析和热重分析(TGA)对制得的水性环氧富锌底漆进行了表观形态分析和耐热性研究。结果表明:选择粒径为3.80μm左右的球形和椭球形混合锌粉,添加量为75%~80%时制得的水性环氧富锌底漆力学性能最好,具有最佳的防腐蚀效果。

Based on the development of water-borne curing agent with excellent water dilubility,an environment-friendly two-component water-borne zinc-rich epoxy primer was studied. Firstly,zinc powder and the various additives were evenly dispersed in the water-based epoxy resin curing agent with ethanol as solvent to prepare stable curing agent. The stability of zinc powder in water-borne epoxy curing agent was studied by solvent precipitation rate test and high-speed centrifugation test. The effect of zinc powder content,particle size and shape on the film performance was studied by testing the anti-corrosion performance of the film. The water-borne epoxy zinc rich primer was characterized by scanning electron microscopy( SEM) and thermogravimetric analysis( TGA) to study the morphology and heat resistance. The results showed that the mechanical and anticorrosive properties of waterborne epoxy zinc rich primer are the best when the particle size of spherical and ellipsoidal mixed zinc powder is about 3.8 μm and the content of zinc powder is 75% ~ 80%.