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/100 g. 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.
Highlights
Perovskite (CaTiO3 or CaO·TiO2 ) and perovskite structural materials are an important class of oxides with an ABO3 -type general formula
The solid-phase synthesis of synthetic perovskite powder (SPP) was as follows: (1) ground calcium carbonate (GCC) and TiO2 ·nH2 O were weighed according to the molar ratio of CaO:TiO2 = 1:1, mixed and added with water to prepare a slurry with a solid content of 30%; (2) The slurry and grinding balls which accounted for three times the weight of the solids in the slurry were ground in a GSDM-3 1000 mL superfine stirring mill
That is, the hiding performance continues to 1100 °C, we discovered that the hiding power of the SPP drops to about 22.5 g/m, that is, the hiding performance continues to increase and reaches a stable value, which should be the result of the increase and continues reaches a stable value,and which should be the resultwhich of theshould
Summary
Perovskite (CaTiO3 or CaO·TiO2 ) and perovskite structural materials are an important class of oxides with an ABO3 -type general formula. CaTiO3 and perovskite structural materials are stable in structure, and have good light absorption and photocatalytic properties, as well as excellent characteristics that can excite carriers and allow them to be separated and transported quickly [4,5,6]. Metatitanic acid is a precursor for the industrial production of TiO2 pigments by the sulfuric acid method, which is mainly composed of aqueous amorphous TiO2 It has the advantages of a large output, a low cost, a high purity and its reaction activity is higher than that of crystalline TiO2 [16,17,18]. For the above-mentioned background, synthetic perovskite powder (SPP) was synthesized by the solid-phase method using metatitanic acid (TiO2 ·nH2 O) and calcium carbonate (CaCO3 ) as raw materials. We characterized the structure and morphology of SPP and studied its pigment properties and applications in architectural coatings
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