Degradation of anti-soiling coatings: mechanical impact of rainfall
Degradation of anti-soiling coatings: mechanical impact of rainfall
复制标题
防污涂层的降解：降雨的机械影响
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
A. Kottantharayil
中科院分区：
文献类型：
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作者：
Sonali Bhaduri;Rohan Bajhal;S. Mallick;N. Shiradkar;A. Kottantharayil
在阳光地带国家，由于光伏组件污染造成的能源损失是报道最多的问题之一。防污涂料(ASC)减少了污垢，提供了一种经济、通用的解决方案。由于ASC应用于光伏组件的外表面，因此这些涂层的耐久性至关重要。在本文中，我们比较了4种不同的商用疏水ASC在印度孟买(温暖潮湿气候)的现场降解率。通过每天接触角的减小来确定ASC的降解率。其中一种涂层的接触角在野外暴露5天后由疏水变为亲水，其余涂层在雨季现场暴露40天后均变得亲水。所有涂层样品在雨季的ASC降解率都是非雨季的4倍以上。使用酸性水(PH 6)进行的加速实验室试验表明，涂料A和C的现场暴露具有良好的相关性。关于雨水的机械影响的实验室研究表明，所有涂层样品的降解率都是线性的，这与雨季的现场暴露研究有很好的相关性。这表明，降雨的机械影响，加上之前报道的pH值和紫外线暴露，是ASC的重要应激源。
Energy loss due to soiling of photovoltaic modules is one of the most reported problems in sunbelt countries. Anti-soiling coatings (ASC) which reduces soiling, offers an economical and universal solution. Since ASC is applied on the outer surface of the PV module, durability of these coatings is essential. In this paper, we compared the field degradation rates of 4 different (named A, B, C and D) commercial hydrophobic ASC in Mumbai, India (warm and humid climate). The degradation rate of ASC was determined in terms of reduction of contact angle per day. Contact angle of one of the ASC changed from hydrophobic to hydrophilic in 5 days of field exposure and all other coatings became hydrophilic in 40 days of field exposure during rainy season. Degradation rates of ASC during rainy season was more than 4 times than that of non-rainy season for all coated samples. Accelerated laboratory tests using acidic water (pH 6) showed good correlation with field exposure for coatings A and C. Laboratory studies on the mechanical impact of rain showed linear rates of degradation for all coated samples, which correlated well with the field exposure study during rainy season. This indicates that the mechanical impact of rain, in addition to the pH and UV exposure reported earlier, as a significant stressor for ASC.