Preparation of CaCO3-TiO2 Composite Particles and Their Pigment Properties
CaCO3-TiO2 composite particles were prepared with calcium carbonate (CaCO3) and TiO2 in stirred mill according the wet grinding method. The pigment properties, morphology, and structure of CaCO3-TiO2 composite particles and the interaction behaviors between CaCO3 and TiO2 particles were explored. In the CaCO3-TiO2 composite particles, TiO2 is uniformly coated on the surface of CaCO3 and the firm combination between CaCO3 and TiO2 particles is induced by the dehydration reaction of surface hydroxyl groups. CaCO3-TiO2 composite particles have similar pigment properties to pure TiO2. The hiding power, oil absorption, whiteness and ultraviolet light absorption of composite particles are close to those of pure TiO2. The application performance of CaCO3-TiO2 composite particles in the paint is consonant with their pigment properties. The contrast ratio of the exterior paint containing CaCO3-TiO2 composite particles is equivalent to that of the paint containing the same proportion of pure TiO2.