Abstract: Solar reflective coatings with different hue， lightness and texture are prepared， and separately coated with silicon modified acrylic resins and nano-titanium dioxide hydrosol in order to investigate the effects of these antifouling layers on the solar reflective sustainability of the protective coating over natural aging. The result shows that for the flat-paint system， the layers comprising nano-titanium dioxide hydrosol does not affect the initial gloss and hue of the protective coatings but improve the dirt-resistance and the sustainability of the solar reflective property， particularly in medium and high brightness samples， therefore it can be used for the promotion of the existing products. When applied on the sand-textured coatings， nano titanium dioxide hydrosol also has better performance as compared with the silicon modified acrylic resins， showing considerable increase in dirt-resistance and reflectance sustainability. But for this kind of coatings， the dirt can not be effectually self-cleaned due to the roughness of the textured surface， indicating that the reflectance sustainability of these coatings are mainly dominated by their texture and lightness.

Key words: nano-titanium dioxide hydrosol, thermal insulating coatings, solar reflectance, solar reflectivity, sustainability

摘要： 分别制备了不同明度、色相、质感的平涂、水包水、水包砂型反射隔热复合涂层，并使用硅改性丙烯酸树脂和纳米二氧化钛水溶胶对这些复合涂层进行耐污防护，在此基础上考察自然老化时间对这些涂层的反射效果的影响作用。结果表明，对于平涂体系，涂装纳米二氧化钛水溶胶的涂层，与未涂装耐沾污涂层及涂装硅丙罩面涂层相比，其初始光泽和色相不受影响，且耐沾污能力得到了改善，反射能力的可持续性得以提高，中、高明度样品尤为显著，适用于既有反射隔热建筑外涂层的保护涂装或产品改善；质感涂层的耐沾污和反射能力可持续性也是涂覆纳米二氧化钛水溶胶的样品最佳，但是由于其表面平整度过差，导致自洁能力不足以与沾污作用抗衡，故反射性能的维持仍以考虑调整涂层质感和整体明度为主。

关键词: 纳米二氧化钛水溶胶, 隔热涂料, 反射性, 太阳光反射比, 可持续性

CLC Number: 

• TQ 637.6