液相化学沉积法制备云母钛珠光颜料

Preparation of TiO 2 mica Nacreous Pigments in Water

将液相化学沉积法合成云母钛珠光颜料剖析为Ｔｉ４＋的水解和水解产物（ＴｉＯ２·ｎＨ２Ｏ）在云母表面沉积两个过程。从Ｔｉ４＋的水解机理和结晶动力学两方面分析了影响云母钛合成的主要因素：反应体系的ｐＨ值、温度和Ｔｉ４＋浓度。对各主要因素进行了实验考察，得到了合成云母钛的较佳工艺条件，即反应体系的ｐＨ值为２．０～２．２，反应温度为７５～８０°Ｃ，Ｔｉ４＋浓度为３．１ｃｇ／Ｌ。同时，对ＴｉＯ２在云母表面的沉积机理进行了探讨。

In this paper it was put forward and proved that preparation of TiO 2 mica was included hydrolysis of Ti 4+ and deposition of TiO 2 · n H 2O on the surface of mica.The main controlling factorsinfluencing preparation were analyzed from kinetics of Ti 4+ hydrolysis and crystallization dynamics;they were pH,temperature,and concentration of Ti 4+ .These factors were investigated in detail through experiment.The optimum conditions were obtained ,pH 2.0～2.2,temperature 75～80°C,and concentration of Ti 4+ 3.1 c g/L.Meanwhile,it was also discussed the deposition mechanism of TiO 2· n H 2O on the surface of mica.