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Evaluation of thermochromic elastomeric roofs roof coatings for low-slope roofs

机译：低坡度屋顶热变色弹性屋顶涂料的评估

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Thermochromic elastomeric roof coatings for low-slope roofs were prepared by incorporating a commercial thermochromic dye (with transition temperature, T-c similar to 32 degrees C) into a white acrylic elastomer matrix. Freshly applied coatings showed an initial temperature-dependent solar reflectance change of 22-25%, with a maximum solar reflectance of 70% in the colorless state (T>T-c). Weathering studies revealed that these thermochromic coatings undergo irreversible photodegradation in as little as 96 h of accelerated aging. Attempts to protect thermochromic dyes with inorganic (nano-ZnO) or organic (Lowilite (R) 20S) UV absorbers were partially successful but need significant improvements to achieve the required lifetime of at least 10 years. Cost calculations in three different geographies showed that even if the durability of these coatings is greatly improved, the energy savings relative to the incumbent static cool roofs are small and do not currently justify the additional cost of thermochromic pigments and UV absorbers. (C) 2017 Elsevier B.V. All rights reserved.
机译：用于低坡度屋顶的热致变色弹性体屋顶涂料是通过将商用热致变色染料（转变温度，T-c类似于32摄氏度）掺入白色丙烯酸类弹性体基质中而制备的。新涂的涂料显示出22-25％的初始温度相关的太阳反射率变化，在无色状态下，最大太阳反射率达到70％（T> T-c）。耐候性研究表明，这些热致变色涂层在加速老化的短短96小时内就经历了不可逆的光降解。尝试使用无机（纳米ZnO）或有机（Lowilite（R）20S）紫外线吸收剂保护热致变色染料虽然取得了部分成功，但需要进行重大改进才能达到至少10年的使用寿命。在三个不同地区的成本计算表明，即使大大提高了这些涂料的耐久性，相对于现有的静态凉爽屋顶而言，其节能量也很小，并且目前尚不能证明热致变色颜料和紫外线吸收剂的额外成本是合理的。 （C）2017 Elsevier B.V.保留所有权利。

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