Preparation of CaCO(3)-TiO(2) Composite Particles and Their Pigment Properties

CaCO(3)-TiO(2) composite particles were prepared with calcium carbonate (CaCO(3)) and TiO(2) in stirred mill according the wet grinding method. The pigment properties, morphology, and structure of CaCO(3)-TiO(2) composite particles and the interaction behaviors between CaCO(3) and TiO(2) particles were explored. In the CaCO(3)-TiO(2) composite particles, TiO(2) is uniformly coated on the surface of CaCO(3) and the firm combination between CaCO(3) and TiO(2) particles is induced by the dehydration reaction of surface hydroxyl groups. CaCO(3)-TiO(2) composite particles have similar pigment properties to pure TiO(2). The hiding power, oil absorption, whiteness and ultraviolet light absorption of composite particles are close to those of pure TiO(2). The application performance of CaCO(3)-TiO(2) composite particles in the paint is consonant with their pigment properties. The contrast ratio of the exterior paint containing CaCO(3)-TiO(2) composite particles is equivalent to that of the paint containing the same proportion of pure TiO(2).