Abstract： Silica-TiO₂ composite particles were prepared through dispersing and depolymerizing the silica as well as grinding mixed particles of silica and TiO₂ by the method of wet grinding. Influencing factors in the process of preparation were optimized. The structures of silica -TiO₂ composite particles, property of pigment and ultraviolet shielding property were characterized. The results show that the factors affecting grinding composition of silica and TiO₂ and the optimal condition are that the median diameter of silica is 2.288 μm, the mass ratio of grinding media to materials is 5∶1, the mass ratio of particles in slurry is 18%, the grinding time is 60 min, and the mass ratio of particles in dispersant is 6% . The feature of silica-TiO₂ composite particles is TiO₂ coated on the surface of silica particles. The silica-TiO₂ composite particles have similar pigment property as TiO₂, and have ultraviolet shielding property for the synergistic reaction between silica and TiO₂.

Keywords: silica； titanium dioxide; composite particle; property of pigment; ultraviolet shielding

中图分类号：TQ110.2       文献标志码：A

文章编号：1008-5548（2015）04-0076-05

DOI:10.13732/j.issn.1008-5548.2015.04.017

收稿日期：2014-10-20， 修回日期：2014-11-03，在线出版时间：2015-08-26。

基金项目：中国地质大学（北京）大学生创新创业训练计划项目，编号：201411415013。

第一作者简介：孙思佳（1994—），女，本科 生，研究方向为矿物复合材料。 E-mail：468131270@qq.com。