Abstract：In water medium, talc-TiO₂ composite particles were made with mechano-chemical method by ways of talcin grinding and mixed grinding of the talc and TiO₂. The factors on preparing process of the talc-TiO₂ composite particles were studied and the structure and pigment properties of it were characterized. The results show that with the mechanical energy gained on the surface of talc particles, the particle size of it decreases firstly, then increases, and decreases slightly at last, which meets the composite requirements with TiO₂. TiO₂ particles tightly coates talc particles' surface and the composite particles has a similar pigment properties like titanium dioxide. Talc-TiO₂ composite powders contained 70% rutile TiO₂ have the hiding power of10.45 g/m², and the ones contained 66% have the hiding power of12.50 g/m². Tiding power rates of the two kinds of composite powders are 105.26% and 88%, respectively, of rutile TiO₂, and the ultraviolet absorption capacity of composite powders are the same as titanium dioxide.

Keywords: talc; titanium dioxide; composite particles; pigment property