Abstract: A composite coating with super-hydrophobicity and low infrared emissivity was prepared by glass rod scraping method using flake brass powders, nano-SiO2 and polydimethylsiloxane (PDMS) modified polyurethane (PU) as functional pigments, micro-nano structural modifier and adhesive, respectively. The effects of the ratio (mass ratio) of PDMS to PU, the addition amount (quality score) of total fillers and the ratio (mass ratio) of brass powder to nano-SiO2 on the coating properties were systematically discussed. The results show that the mass ratio of PDMS to PU has an important influence on the adhesion strength and hydrophobic properties of the coating. When the mass ratio of PDMS to PU is 1:9, the coating has outstanding super-hydrophobic properties, the adhesion strength of the coating can reach 1 grade, the water contact angle and sliding angle can reach 155° and 5°, respectively. The total filler addition amount has a significant impact on the coating performance. With the increase of the filler addition amount, the emissivity of the coating increases and the glossiness decreases. When the total filler content is 50%, the coating surface can form an obvious papillary micro-nano rough structure, so that the coating has outstanding super-hydrophobic properties. The mass ratio of brass powder to nano-SiO2 can obviously affect the emissivity and hydrophobic properties of the coating. When the mass ratio of brass powder to nano-SiO2 is 6.5:3.5, the coating can have good overall performance and outstanding self-cleaning performance. At this time, the emissivity of the coating can be as low as 0.716;the glossiness and adhesion strength are grade 1.8 and grade 1, respectively;the water contact angle and sliding angle are 151° and 8°, respectively.
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2023, Vol. 37 
