A composite coating with super-hydrophobicity and low infrared emissivity was prepared by glass rod scraping method using flake Al powders,nano-SiO2 and polydimethylsiloxane (PDMS) modified epoxy resin (HYSZ) as functional pigments,micro-nano structural modifier and adhesive,respectively.The effects of the mass ratio of PDMS to HYSZ,the total filler addition and the mass ratio of flake Al powder to nano-SiO2 on the coating properties were systematically investigated.The results showed that the mass ratio of PDMS to HYSZ had an important influence on the adhesion strength and hydrophobic properties of the coating.When the mass ratio was 1∶9,the coating had good hydrophobic properties and its adhesion strength could reach grade 1.The total filler addition had an obvious impact on the coating performance.With the increase of the total filler addition,the emissivity and the glossiness of the coating could be significantly reduced.When the total filler addition was 50%,the coating surface produced obvious papillary micro-nano rough structure,which could significantly improve the hydrophobic performance of the coating.The mass ratio of flake Al powder to nano-SiO2 could obviously affect the emissivity and hydrophobic properties of the coating.When the mass ratio was 5∶5,the coating had good overall performance.At this time,the emissivity of the coating was as low as 0.652;the glossiness and adhesion strength were 2.7 and grade 1,respectively;the water contact angle and sliding angle were 152° and 8°,respectively.By appropriately reducing the surface energy of the coating and building a micro-nano rough structure on the surface of the coating,the super-hydrophobicity,low emissivity and high adhesion strength compatibility of the coating could be achieved.
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基金资助
国家自然科学基金(61705029);安徽省高校优秀青年人才支持计划重点项目(gxyqZD2020044);安徽省自然科学基金项目(1808085MF187);安徽省科技重大专项(202103a05020018);滁州学院大学生创新训练计划项目(2021CXXL087)
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