Effects Of Coating Parameters Of SiO2-Coated TiO2
1.Introduction TiO2 powders with particle sizes of more than 100 nm are widely used as a white commercial pigment in the paint, plastic, and paper industries on account of their nontoxicity, opacity, high chemical stability, and excellent whiteness and brightness optical properties. The covering of TiO2 surface with nonactive oxides, such as SiO2, Al2O3, and ZrO2, plays an important role in suppressing the photoactivity and improving the weather durability 1-3. Chloride and sulfate mutes are two routes which Rutile TiO2 powders are industrially produced. Rutile TiO2 powders produced by both mutes must be coated with protective layers of SiO2 and Al2O3 in the subsequent steps by wet chemistry processing for decreasing the photoactivity and increasing the weather durability and the dispersibility in liquids 1-3. The rutile TiO2 powders produced by chloride route have narrower particle size distribution and smoother surface than that produced by sulfate route. After covering the inert layer on the TiO2 surface, the former has better pigmentary property than the latter. Although several patents dealt with the covering of the rutile TiO2 powders for improving the pigmentary property and the weather durability 4-6, few papers reveal in great detail the mechanism on the coating process of the inert layers and the relevant optical property 3.
ruffle TiO2 SiO2 Island-like coating uniform coating
Yumin Liu Chen Ge Min Ren Hengbo Yin Dongzhi Zhang Aili Wang Chunyan Liu
School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China Faculty of Chemistry and Chemical Engineering,Jiangsu University,Zhenjiang 212013,P.R.China
国际会议
江苏镇江
英文
285-286
2008-10-15（万方平台首次上网日期，不代表论文的发表时间）