改性玻璃鳞片/水性环氧防腐涂料的研制

Preparation of waterborne anticorrosive epoxy paint containing modified glass flakes

将硅烷偶联剂KH560作为改性介质,采用化学接枝法在KH560与玻璃鳞片(GF)的质量比分别为1∶1、3∶1和5∶1的条件下合成了KH560/GF、3KH560/GF和5KH560/GF三种表面改性玻璃鳞片。红外光谱和扫描电镜的测试结果表明KH560发生水解缩合并与玻璃鳞片表面的活性羟基共价键合,硅烷低聚物沉积到玻璃鳞片表面形成包覆层。再以改性玻璃鳞片为防腐填料,搭配环氧乳液、颜填料和各类助剂研制了一款性能优异的双组分水性环氧防腐涂料,探讨了水性环氧树脂种类、树脂与固化剂的质量比、改性玻璃鳞片种类及其用量对漆膜性能的影响。实验结果表明:当选用环氧乳液2060和固化剂725且其质量比为5∶1,3KH560/GF在防锈体系中的质量分数为60%时,所制涂层综合性能最佳,耐中性盐雾时间可达720 h。

A series of modified glass flakes(GF)including KH560/GF,3KH560/GF,and 5KH560/GF were synthesized by grafting silane coupling agent KH560 onto the surface of glass flake when the mass ratio of KH560 to GF was controlled at 1:1,3:1,and 5:1,respectively.The results of Fourier-transform infrared(FTIR)spectroscopy and scanning electron microscopy(SEM)confirmed that the silane oligomers produced by hydrolysis and polycondensation of KH560 wrapped the glass flakes up through the chemical bonding between hydroxyl groups with high activity.A two-component waterborne anticorrosive epoxy paint with good performance was prepared based on epoxy emulsion combined with several fillers(containing the modified glass flakes),pigments,and additives.The effects of the varieties of epoxy resin,the mass ratio of resin to curing agent,and the varieties and dosage of modified glass flakes on the properties of coating were discussed.The experimental results showed that the coating prepared by epoxy resin 2060 and curing agent 725 at a mass ratio of 5:1 with 60%of 3KH560/GF in the antirust system had the best comprehensive performance with a neutral salt spray corrosion resistance at least 720 hours.