选择不同光谱选择性材料制备涂层, 比较其可见光 -近红外光谱反射性能差异, 并通过测试模拟罐体内介质温度和涂层辐射性能及耐环境性能, 探究光谱选择性散热涂层的材料性能差异及选择依据。采用 UV-Vis-NIR分光光度计对涂层在紫外-可见-近红外波段的反射性能进行表征, 采用 SEM测试对涂层结构进行表征及分析, 并使用红外发射率仪测试涂层发射率性能。结果表明: 金红石型 TiO2作为填料的涂层, 太阳光反射率可达 77.65%, 在 8～14.m波段发射率为 0.96, 且 60 ℃ RH96%耐湿热测试时长 720 h以上以及紫外老化时长 360 h以上仍保持良好的性能和外观。

The visible and near infrared spectral reflectance properties of the coatings prepared by different spectral selective materials were studied. The selective criteria of the spectral selective cooling coatings which leaded to the variant properties was also studied through the radiation performance, environmental performance and the temperature of internal medium in the simulation can. The reflective properties, the structure and the emission ratio of the coatings were characterized by UV-Vis-NIR spectrophotometer, SEM, and infrared radiation rate meter. The result shows that the solar reflectance of rutile TiO2 coating is 77.65%, and the emission ratio within 8～14 μm waveband of the coating is 0.96. The appearance and performance of TiO2 coatings were still good after 60 ℃ RH96% wet-heat resistance test lasted for 720 hrs and UV aging test lasted for 360 hrs.