Abstract Polydimethylsiloxane (PDMS) modified polyurethane (PU)/Al composite coating with super-hydrophobicity and low infrared emissivity was prepared via glass rod scraping method using nano-SiO2, PDMS modified PU, and Al powders as micro-nano structural modifier, resin matrix, and functional pigments, respectively. The effects of curing temperature, Al powder addition, and the ratio of Al powder and nano-SiO2 on the coating performance has also been discussed. The results show that when the curing temperature of coating was 80 °C, the coating had lowest infrared emissivity and glossiness properties. The Al powder addition had an important effect on the coating performance. When the amount of Al powder was 50 wt%, the emissivity and glossiness of the coating were as low as 0.167 and 13.5, respectively, while, the water contact angle (WCA) of the coating reached 117°, which is significantly higher than that for traditional resin-based low emissivity coatings. The modification of coating with appropriate amount of nano-SiO2 led to clear mastoid micro-nano structures on the coating surface, so that the coating could achieve super-hydrophobic properties. When the ratio of Al powder and nano-SiO2 in the coating was 6:4, the WCA of the coating reached 151.5°, the sliding angle reached 9°, and the coating had outstanding self-cleaning performance. At the same time, the super-hydrophobic coating had relatively low emissivity (0.614) and extremely low glossiness (3.5) properties.

中文翻译：

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具有超疏水性和低红外发射率的 PDMS 改性聚氨酯/铝复合涂层的制备和表征

摘要 以纳米SiO2、PDMS改性PU、Al粉体为微纳米结构改性剂、树脂基体，通过玻璃棒刮削法制备了具有超疏水性和低红外发射率的聚二甲基硅氧烷(PDMS)改性聚氨酯(PU)/Al复合涂层。和功能性颜料。还讨论了固化温度、Al粉添加量以及Al粉与纳米SiO2的比例对涂层性能的影响。结果表明，当涂层固化温度为80℃时，涂层的红外发射率和光泽度性能最低。添加铝粉对涂层性能有重要影响。当铝粉用量为 50 wt% 时，涂层的发射率和光泽度分别低至 0.167 和 13.5，而 涂层的水接触角(WCA)达到117°，明显高于传统树脂基低辐射涂层。用适量的纳米SiO2对涂层进行改性，在涂层表面形成清晰的乳突微纳米结构，使涂层达到超疏水性能。当涂层中Al粉与纳米SiO2的比例为6:4时，涂层的WCA达到151.5°，滑动角达到9°，涂层具有优异的自洁性能。同时，超疏水涂层具有相对较低的发射率 (0.614) 和极低的光泽度 (3.5)。用适量的纳米SiO2对涂层进行改性，在涂层表面形成清晰的乳突微纳米结构，使涂层达到超疏水性能。当涂层中Al粉与纳米SiO2的比例为6:4时，涂层的WCA达到151.5°，滑动角达到9°，涂层具有优异的自洁性能。同时，超疏水涂层具有相对较低的发射率 (0.614) 和极低的光泽度 (3.5)。用适量的纳米SiO2对涂层进行改性，在涂层表面形成清晰的乳突微纳米结构，使涂层达到超疏水性能。当涂层中Al粉与纳米SiO2的比例为6:4时，涂层的WCA达到151.5°，滑动角达到9°，涂层具有优异的自洁性能。同时，超疏水涂层具有相对较低的发射率 (0.614) 和极低的光泽度 (3.5)。