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Preparation of CaCO₃-TiO₂ Composite Particles and Their Pigment Properties
Sijia Sun1, Hao Ding2, Xifeng Hou3
1Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Xueyuan Road, Haidian District, Beijing 100083, China. ssjcugb@163.com.
Abstract:
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.
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