金红石型云母钛珠光颜料的合成及表征

The Preparation and Analysis of Rutile Titania-Mica Pearlescent Pigment

采用液相沉积法,使TiCl4溶液在78℃和pH=2.0条件下水解生成水合TiO2纳米颗粒,并在云母表面形成包覆膜,经过水洗、抽滤、烘干,以8℃/min的升温速率分别加热到600℃和800℃并保温0.5h,得到色泽纯正、鲜艳、遮盖率高、耐候性好的金红石型珠光颜料。利用X射线衍射仪(XRD)分析测试表明,在包覆TiO2之前用适量的SnO2对云母片表面进行预处理能有效地提高TiO2颗粒在煅烧过程中金红石型的转化率;利用扫描电镜(SEM)对珠光颜料的表面结构进行测试,结果显示所制得的云母珠光颜料的包覆膜平整致密,TiO2粒径分布在30～40nm之间。

Through the liquid deposition method, TiO2 particles were prepared and deposited on the surface of mica by the hydrolyzation of TiCI4 solution at 78 ℃ with pH 2.0. Titania-mica pearlescent pigment was prepared by washing, drying and calcining. These samples were heat-treated at a heating rate 8 ℃/min and kept for 0.5 h at calcinations temperature 600 ℃ and 800℃ respectively. The crystal phase transition of the TiO2 coated on the surface of mica and the surface microstructure of the pigments were studied by XRD and SEM. The results show that the process in which mica was pre-coated with a small amount of SnO2 as chemical inducing promoters can effectively promote the phase transition of TiO2. The SEM photos show that the smooth continuous compact film of pearlescent pigment is prepared, and the particles sizes of the film are ranged from 30 nm to 40 nm. The rutile titania-mica pearlescent pigments with pure vivid color, high capacity of cover and good time enduring, were prepared according to the experimental conditions mentioned above.