Abstract
Through reasonable coating structural design, a polydimethylsiloxane (PDMS) modified polyurethane (PU)/Sm2O3 composite coating with super-hydrophobic and near-infrared absorption properties was prepared by glass rod scraping method using nano-SiO2, PDMS modified PU, and Sm2O3 particles as micro-nano structural modifier, adhesives, and functional pigments, respectively. The effects of curing temperature, Sm2O3 addition, and mass ratio of Sm2O3 and nano-SiO2 on the coating properties were discussed. The results show that the Sm2O3 addition has an important effect on the coating properties. When the curing temperature of the coating is 80 °C and the addition amount of Sm2O3 is 50 wt%, the reflectivity of the coating to 1.06 μm near-infrared light can be as low as 36%. The water contact angle (WCA) of the coating can reach 115°, which is significantly higher than traditional PU-based near-infrared absorption coatings. The super-hydrophobic properties of the coating can be achieved by adjusting the mass ratio of Sm2O3 and nano-SiO2 in the coating. When the mass ratio of Sm2O3 and nano-SiO2 in the coating is 7:3, obvious papillary micro-nano rough structure can appear on the surface of the coating, so that the coating can exhibit super-hydrophobic properties. The WCA of the coating can reach 153°, the sliding angle can reach 7°, and the reflectivity of 1.06 μm near-infrared light can be as low as 59.3%. The coating has good super-hydrophobic and near-infrared absorption properties at the same time.
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