二氧化钛高效包覆空心玻璃微珠的研究

Study on hollow glass microspheres coated with titanium dioxide

采用水解沉淀法在空心玻璃微珠表面包覆一层二氧化钛,研究了微珠的表面活化处理和制备条件对表面包覆的二氧化钛形貌和硫酸钛利用率的影响。扫描电子显微镜(SEM)分析表明,氢氧化钠和硅烷偶联剂γ-氨基丙基三乙氧基硅烷(KH550)对微珠的表面活化处理能明显改善包覆效果,同未经活化处理的微珠相比,表面的二氧化钛包覆紧实、颗粒均匀。化学分析表明,微珠活化处理后,最佳的包覆条件为:pH为6、m(Ti(SO4)2)∶m(微珠)=1.2∶1.0、包覆时间为4h、包覆温度为70℃,此时硫酸钛利用率可高达84.3%。

The surface active treating and process conditions of hollow glass microspheres coated with TiO2 is studied. SEM analysis shows that treating the surface of hollow glass microspheres by sodium hydroxide and silane coupling agent can significantly improve the coating compared with unactivatied microspheres. The coating of Ti02 is compact and uniform. The chemical analysis shows that after activation, the best coating conditions are as follows ： pH = 6, m[Ti（ SO4 ）2 ] ： m （microspheres） = 1.2 ： 1.0,4 hours of coating time, 70℃ of coating temperature. Under above conditions,the utilization of titanium sulfate is up to 84. 3%.