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.
Highlights
IntroductionThe CaCO3 powder material prepared with various non-metallic minerals, such as aragonite, calcite, and some rocks with calcite as the main ingredient component, has many advantages, such as high purity, high whiteness, good compatibility with organic and inorganic matrices, and low cost [1,2]
CaCO3 is an important inorganic mineral material
CaCO3-TiO2 composite particles were prepared with CaCO3 and TiO2 in stirred mill according to the wet grinding method
Summary
The CaCO3 powder material prepared with various non-metallic minerals, such as aragonite, calcite, and some rocks with calcite as the main ingredient component, has many advantages, such as high purity, high whiteness, good compatibility with organic and inorganic matrices, and low cost [1,2]. CaCO3 has become the most widely used filler in many industrial products such as plastic, paint, and paper due to its obvious cost advantage compared to most non-metallic minerals [3,4]. In order to further increase the utilization value of CaCO3 and achieve the efficient utilization of mineral resources, it is necessary to develop CaCO3 -based composite with oxides, such as TiO2 [5,6]. The composite pigment prepared by coating TiO2 particles on the surface of CaCO3 particles, had received wide attention [7]. The preparation of the composite pigment will enhance the comprehensive utilization of titanium resource [8,9,10]
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