A low infrared emissivity coating with super-hydrophobic properties was prepared by glass rod coating method using nano-SiO2 as the micro-nano structural modifier,hydrogen-containing silicone oil (HQGY) blending modified polyurethane (PU) as the resin matrix,and flake brass powder as the functional pigment,respectively.The influence of the mass ratio of HQGY to PU,the total filler (brass powder+nano SiO2) addition,and the mass ratio of brass powder to nano SiO2 on the coating properties was systematically studied.The results showed that the mass ratio of HQGY to PU could significantly affect the surface energy and active group content of the coating,thereby affecting the overall performance of the coating.The increase of the total filler addition could obviously increase the papillary micro-nano rough structure of the coating surface,thereby increasing the emissivity of the coating,reducing the glossiness,and increasing the water contact angle.The reduction of the mass ratio of brass powder to nano-SiO2 could reduce the absolute content of flake brass powder and increase the absolute content of nano-SiO2 in the coating,which in turn increased the emissivity of the coating,reduced the glossiness,and increased the water contact angle.When the mass ratio of HQGY to PU was 1∶9,the total filler content was 50%,and the mass ratio of brass powder to nano-SiO2 was 6.5∶3.5,the coating had the best emissivity (0.738),glossiness (1.8),adhesion strength (level 1),and super-hydrophobic performance (water contact angle 152°,rolling angle 8°) at the same time.
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