Abstract
In this work, white Portland cement (WPC) based composite coatings consisting of WPC, building glue, phase change microcapsules, TiO2 particles, polymethylhydrosiloxane, and SiO2 particles were developed via a brushing method. After adjusting the variety and content of additives, the optimized WPC coating (PCM30S/WPCM) exhibits a phase transition temperature of 35 °C, solar reflectivity of 0.764, contact angle of 157.6°, and rolling angle of 7.1°. The coating shows stable superhydrophobicity in the corrosion test, mechanical abrasion test, ultraviolet (UV) aging experiment, and temperature fluctuation experiment. In addition, the superhydrophobic WPC composite coating exhibits a significant cooling effect of 8.5 °C under simulated solar radiation. Furthermore, the phase change coating can also prevent large fluctuation of coating surface temperature through phase change function, so as to improve building comfort. The simulation analysis indicates that the energy saving rate of the superhydrophobic phase change coating is the highest in Guangzhou, China, which is 23.2%.
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