CIESC Journal ›› 2019, Vol. 70 ›› Issue (9): 3537-3544.DOI: 10.11949/0438-1157.20190311

• Material science and engineering, nanotechnology • Previous Articles     Next Articles

Development and spectral reflectance analysis of thermochromic coatings for buildings

Yuxuan ZHANG(),Xiaoqiang ZHAI()   

  1. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2019-04-01 Revised:2019-06-19 Online:2019-09-05 Published:2019-09-05
  • Contact: Xiaoqiang ZHAI

感温变色建筑涂料的制备及光谱反射性能实验研究

张宇轩(),翟晓强()   

  1. 上海交通大学制冷与低温工程研究所,上海 200240
  • 通讯作者: 翟晓强
  • 作者简介:张宇轩(1995—),男,硕士研究生,zhangyuxuan@sjtu.edu.cn
  • 基金资助:
    政府间国际科技创新合作重点专项(2016YFE0133300)

Abstract:

Thermochromic coatings have great application potential in reducing the building’s heating and cooling load and improving the urban thermal environment. In order to investigate the factors influencing the optical properties of thermochromic coatings and optimize the material formulation, 12 different thermochromic coatings with the color-changing temperature of 31°C were prepared by incorporating thermochromic powder with other assistant components. The effects of rutile TiO2 content on the spectral reflectance of the coatings were analyzed. The results show that the spectral reflectance of coatings increases with the content of TiO2. The optimum mass fraction for thermochromic powder is 5%, and for TiO2 is about 5%—10%, in which the solar reflectance of colorless phase is higher than that of colored phase by more than 0.2. At the same time, the effects of the particle size of TiO2 on the reflectivity of the coatings in different bands were investigated. The results show that the reflectivity of the thermochromic coatings decreases with the increase of TiO2 particle size in ultraviolet and visible light bands except red band. In the red and near-infrared bands, the reflectivity of the thermochromic coatings increases with the increase of TiO2 particle size.

Key words: thermochromic coatings, spectral reflectance, solar energy, building energy saving

摘要:

感温变色建筑涂料在降低建筑冷热负荷、改善城市热环境方面具有很大的应用潜力。为了探究感温变色材料光学性能的影响因素,优化材料配方,首先制备了12种不同配方,变色温度为31℃的感温变色涂料,并分析了金红石型TiO2质量百分含量对涂料光谱反射率和太阳光反射比的影响,研究表明涂料光谱反射率均随着TiO2含量的增加而提高,感温变色粉最佳质量分数5%,TiO2的最佳质量分数应在5%~10%之间,此时浅色态的反射比比深色态高0.2以上。同时探究了TiO2粒径对涂料在不同波段反射率的影响,结果表明,在紫外和除红光外的可见光波段,感温变色涂料的反射率基本上随TiO2粒径的增大而减小;在红光和近红外波段,感温变色涂料反射率基本上随TiO2粒径的增大而增大。

关键词: 感温变色涂料, 光谱反射率, 太阳能, 建筑节能

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