CaCO3/TiO2 hybrid microcapsules with self-cleaning and self-repairing functions for decorative coatings

Utilizing photocatalyst TiO2 to hybridize CaCO3 as the wall material and linseed oil as the core material, self-cleaning and self-repairing microcapsules were produced by in-situ precipitation. The microcapsules were evaluated for micromorphology, chemical composition, thermal stability, self-cleaning and self-repairing properties. The results demonstrate that the microcapsules have a rough and spherical surface, as well as remarkable thermal stability and repeatability. When the dosage of microcapsules increased, the degradation rate of methylene blue increased significantly, and the self-repairing effect of micro-cracks was gradually obvious. The optimal microcapsule dosage is 7.0 wt%. The coating hardness is kept at 3H, the adhesion level is 2B, and the impact resistance height is 50 cm. TiO2 and CaCO3 are hybridized to create an inorganic wall, the microcapsules possess the excellent self-cleaning and self-repairing capabilities.