乙烯基三乙氧基硅烷(VS)水解关键工艺

Critical Hydrolytic Technological Parameters of Vinyltriethoxysilane

采用硅烷偶联剂对金属进行预处理是一种新型、环保的表面处理工艺,可以显著提高涂层的结合力及金属耐蚀性能,有望替代传统的磷化和钝化处理,而水解过程是决定金属表面硅烷化预处理好坏的关键。采用反射吸收红外光谱法研究了温度、pH、醇水比及硅烷体积分数等关键因素对乙烯基三乙氧基硅烷水解的影响,确定了水解液中获得最多硅醇单体时的水解工艺参数;在一定温度范围内,硅烷溶液水解程度随着水解温度的升高而增大;通过比较Si—O—Fe与Si—O—Si峰强的变化,确定Si—O—Fe与Si—O—Si在金属表面存在竞争协同作用。

It is a new and environmental-protecting surface-treatment technology to apply silane coupling agents in metal pretreatment, which can obviously improve the adhesion and the anticorrosion of coating. The conventional chromating and phosphating process can be replaced by it. However, the key factor of restricting silylated metal surface pretreatment quality is the hydrolysis process. The key factors of vinyltriethoxysilane hydrolysis was studied by reflection absorption infrared spectroscopy, s.uch as temperature, pH, alcohol-water ratio, the concentration of silane and so on. Determined the maximum yield of silicon at the time of alcohol monomer hydrolysis process; The competition and cooperation mechanism of Si--O--Fe and Si--O--Si in the metal surface were researched by the strong changes of Si--O--Fe and Si--O--Si peak characteristic.