Study on Titanium Dioxide Powders Coated by Silica and Alumina

The application of titanium dioxide is affected seriously by its photochemical activity and flocculation in organic pigments.Surface treatment can solve the problem and improve its performance.The technology and performance of titanium dioxide coated by silica and alumina was studied.The coated titanium dioxide was prepared and the optimum preparation conditions were as follows: the coating order is adding silicon first and then aluminum,coa-ting time is 3 h,coating temperature is 90 ℃,mass fraction of silicon in coating agent is 3%.