近红外反射超疏水黄色涂层的制备和性能

将钛铬棕粉末(TCB)、金红石型二氧化钛(TiO₂)、疏水纳米二氧化硅(SiO₂)与聚二甲基硅氧烷(PDMS)溶液混合,一步刷涂制备出超疏水黄色涂层,系统地研究了涂层的表面润湿性、疏水稳定性、耐紫外线老化性能、自清洁性能、以及近红外反射性能。结果表明,这种涂层的水接触角(CA)和滚动角(SA)分别为155.2°和5.4°；涂层在1.0 kPa的压力下经过2 m距离的砂纸磨损后和5 L的水流冲击后依然保持优异的疏水性,其附着力和硬度分别达到2级和6B等级；不同pH值的溶液在涂层表面都具有超疏水效果并具有化学稳定性；用紫外线照射240 h后涂层表面仍然保持极强的疏水性,表明其具有耐紫外线老化性能；涂层表面具有优异的自清洁性能,污染物极易地被水滴带走；涂层的近红外反射率和太阳反射率分别达到0.858和0.672,对普通水泥板具有明显的降温效果,在户外暴露和水流冲击后仍保持较高的反射率。

Preparation and Properties of Near-infrared Reflective Superhydrophobic Yellow Coating

The superhydrophobic yellow coating was prepared by mixing titanium chromium brown powder (TCB), rutile titanium dioxide (TiO₂), hydrophobic nano silica (SiO₂) with polydimethylsiloxane (PDMS) solution and brush coating by one step. The surface wettability, hydrophobic stability, ultraviolet light aging resistance, self-cleaning performance and near-infrared reflection performance of the coating were systematically investigated. The results show that the water contact angle (CA) and roll angle (SA) of the coating are 155.2° and 5.4°, respectively; the coating retains excellent hydrophobicity after sandpaper wear at a distance of 2 m by 1.0 kPa and water impact at a distance of 5 L, meanwhile its adhesion and hardness reach grade 2 and 6B, respectively; the coating surface presents superhydrophobic effect and have chemical stability in solutions of different pH; The coating surface still retains strong hydrophobicity after ultraviolet light irradiation for 240 h, indicating that it has UV aging resistance; the coating surface has excellent self-cleaning performance, and the pollutants are easily carried away by water droplets; the near-infrared reflectance and solar reflectance of the coating are 0.858 and 0.672, respectively. The coating has obvious cooling effect on the ordinary cement board, and still maintains a high reflectance after outdoor exposure and water impact.