Spray-coated hollow glass/TiO2 superhydrophobic radiative cooling coating

Using triethoxy-1H,1H,2H,2H-tridecafluoro-N-octylsilane to modify hollow glass microspheres, fluorinated hollow glass with low surface energy and high reflectivity is obtained. Then, TiO2 is added, and epoxy resin E51 modified with silane coupling agent KH550 is used as the binder for uniform spraying. After drying, a coating with high reflectivity is obtained. The coating has a water contact angle of 154° and exhibits excellent cleaning ability for liquid and solid contaminants on the coating surface. At the same time, the coating has a solar reflectance of up to 92.5% and a high infrared emissivity, which can achieve a cooling effect of around 14 °C, exhibiting excellent radiative cooling performance. The coating maintains its self-cleaning and radiative cooling capabilities even after 120 wear cycles.