Abstract：A kind of composite white pigment was prepared using the talc as cores and coating on the surface by TiO₂ by means of mechano-chemical method. The properties and structure of talc-TiO₂ composite white pigment were characterized, and its application in coating was studied. The results show that TiO₂ particles tightly coates talc particles' surface. The size of composite particles distributes evenly. The composite particles has a similar pigment properties like titanium dioxide. The hiding power rates two composite powders, contenting TiO₂ of 60% and70%, respectively reach 82% and 98.9% of titanium dioxide.When the amount of pigment is added to 15%~20%, the contrast ratio of these two kinds of composite pigment exceeds the value formulated by the national standard grade index required (≥0.90) and quality indexes (≥0.93) , and composite powders of titanium dioxide have a considerable ultraviolet absorption capacity.

Keywords: talc; titanium dioxide; white pigment; coating