Synthesis of Perovskite by Solid-Phase Method with Metatitanic Acid and Calcium Carbonate and Its Pigment Properties Investigation

Abstract

Synthetic perovskite powder (SPP) was synthesized by the solid-phase method using metatitanic acid (TiO₂nH₂O) and calcium carbonate (CaCO₃) as raw materials, and its structure, morphology, pigment properties and application in architectural coatings were studied. When TiO₂nH₂O and CaCO₃ were mixed and ground at a molar ratio of TiO₂: CaO = 1:1, and then calcined at 900-1100 °C, SPP with a single perovskite phase was obtained. The characterization results displayed that the unit particle size of SPP was 50-150 nm, the aggregate size was 1-2 μm, and its particles were well dispersed. The SPP also had a whiteness of 90.5%, and an oil absorption of 35.03 g/100g. The hiding power of SPP was 24.02 g/m², which was 81.6% of pure TiO₂ hiding power (19.60 g/m²). When adding SPP to prepare a building exterior wall coating, the contrast ratio of the coating film was 0.92, which met the requirements of the Chinese national standard GB/T 9755-2014 and was equivalent to adding rutile titanium dioxide. Thus, perovskite synthesized from TiO₂nH₂O and CaCO₃ by the solid-phase method significantly improved the pigment properties of TiO₂ in the same proportion.

Keywords: calcination; calcium carbonate; metatitanic acid; perovskite; pigment.