Effect of TiO2 pigment gradation on the properties of thermal insulation coatings

摘要

This study was designed to evaluate the thermal performance and mechanical properties of coatings with different gradations of TiO_2 pigments. The solar reflectance, cooling performance, wash resistance, and film adhesion strength of the coatings were investigated. The influence of TiO_2 powder gradation on the final properties of the coatings was studed. The solar reflectance and the thermal insulation were observed to increase with increasing content of nanosized TiO_2. The mechanical properties of the coatings, such as their wash resistance and film adhesion strength, were observed to increase with increased incorporation of nanosized TiO_2. Such improvements in the properties of the coatings were attributed to the greater specific surface area and lower thermal conductivity of nanosized TiO_2 particles compared to normal TiO_2 particles.