Effect of SiO2 Aerogel and Other Functional Fillers on Performance of Reflective Heat Insulation Coatings
In order to improve the thermal insulation performance of SiO2 aerogel reflective thermal insulation coating,the influence of hydrophilic and hydrophobic SiO2 aerogel mixture on the solar thermal reflectance and thermal insulation temperature difference were studied,as well as the role of several functional fillers.The results showed that the reflective heat insulation coating made by hydrophobic SiO2 aerogel with 1.5%had the best performance,with the solar thermal reflectivity of 83.32%and the thermal insulation temperature difference of 31.6℃.The reflectance of the reflective heat insulation coating made of hollow glass beads with 9%content reached 85.33%,and the heat insulation temperature difference reached 32.65℃,which was the best performance among other functional fillers.The thermal conductivity of 1.5%hydrophobic SiO2 aerogel and 9%hollow glass beads was 0.041 W·m-1·K-1,which was 30%～40%lower than the thermal conductivity of the reflective heat insulation coating made by separate use,showing good thermal insulation effect.
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