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Funct. Mater. 2019; 26 (4): 789-794.

doi:https://doi.org/10.15407/fm26.04.789

The influence of nano-silica sol on the performance of iron chromium black for the building energy-saving coating

Q.Gao, J.Wen

Chongqing Jianzhu College, 400072 Chongqing, China

Abstract: 

The nano-silica sol was modified by a silane coupling agent KH560 for the building energy-saving coating. The effect of the modified silica sol dosage on coating properties was discussed. Increasing the amount of modified silica sol can enhance the reflective properties of the coating and improve the ageing resistance and stain resistance of the coating. However, the excessively modified silica sol can cause film formation difficulties, but reduce the performance of the coating. When the mass ratio of the modified silica sol to the pure acrylic emulsion is 1:1, the overall performance of the coating is the best; the solar reflectance and the near-infrared reflectance of the coating without the modified silica sol increased by 7.41 % and 8.33 %, respectively, the rate of change of solar reflectance after aging and pollution is reduced by 2.67 % and 1.30 %, and the static water contact angle is increased by 29.2 °. Water resistance, adhesion, pencil hardness, flexibility and impact strength have all been improved to some extent.

Keywords: 
building energy-saving coating, silica sol, modification.
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