Development of durable self-cleaning coatings using organic–inorganic hybrid sol–gel method
Development of durable self-cleaning coatings using organic–inorganic hybrid sol–gel method
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DOI：
10.1016/j.apsusc.2015.03.105
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发表时间：
2015-07
影响因子：
6.7
通讯作者：
D. Kumar;Xinghua Wu;Q. Fu;J. Ho;Pushkar D. Kanhere;Lin Li;Zhong Chen
中科院分区：
文献类型：
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作者：
D. Kumar;Xinghua Wu;Q. Fu;J. Ho;Pushkar D. Kanhere;Lin Li;Zhong Chen
具有优异的防水性和良好的机械性能的自清洁涂料的需求很高。然而，生产这种具有耐机械磨损和耐环境老化性的涂层仍然是一个关键挑战。采用溶胶-凝胶法制备了基于正硅酸乙酯（TEOS）和缩水甘油氧基丙基三乙氧基硅烷（GH 3 O）的机械稳定涂层。重点是添加环氧硅烷，它产生的有机基质，与无机Sisingle bondO单键Si矩阵形成的TEOS共混。混合基质的组合产生了对基材具有良好粘附性和改善的机械性能的涂层。引入氟烷基硅烷（FAS）和二氧化硅填料以增加涂层的疏水性。结果表明，当填料粒径从1-5 μm减小到10-20 nm时，涂层的水接触角从115°增大到164°。具有15重量%的涂层的滑动角（SA）10-20 nm二氧化硅的负载约为2°。紫外老化对涂层的性能没有明显影响。系统分析了涂层的力学性能、硬度、杨氏模量、涂层结合力和耐磨性等性能。在当前的工作中，进行了一个简单的自清洁测试，该测试测量污垢积聚的程度和随后通过喷水去除的程度。具有15重量%的涂层10-20 nm二氧化硅颗粒的负载在机械磨损之前和之后都显示出最好的自清洁性能。开发的涂层工艺简单，可以很容易地扩大规模，用于需要自清洁功能的大表面。
Self-cleaning coatings with excellent water-repellence and good mechanical properties are in high demand. However, producing such coatings with resistance to mechanical abrasion and environmental weathering remains a key challenge. Mechanically robust coatings based on tetraethylorthosilicate (TEOS) and glycidoxypropyltriethoxysilane (Glymo) have been prepared using a sol–gel method. Emphasis is given to the addition of Glymo, an epoxy silane which creates an organic matrix that blends with the inorganic Sisingle bondOsingle bondSi matrix formed from the TEOS. The combination of the blended matrix produced coatings with good adhesion to substrates and improved mechanical properties. Fluoroalkylsilane (FAS) and silica fillers were introduced to increase the hydrophobicity of the coating. It was found that the water contact angle (CA) of these coatings increases from 115° to 164° upon decreasing filler size from 1–5 μm to 10–20 nm. The sliding angle (SA) for coatings with 15 wt.% loading of 10–20 nm silica is around 2°. UV weathering does not show significant effect on the properties of the coatings. Mechanical properties and performances including hardness, Young's modulus, coating adhesion and abrasion resistance were systematically analyzed. In the current work, a simple self-cleaning test, which measures the extent of dirt accumulation and subsequent removal by water spray, was performed. The coatings with 15 wt.% loading of 10–20 nm silica particles show the best self-cleaning performance both before and after mechanical abrasion. The developed coating process is simple and can be easily scaled-up for large surfaces that require self-cleaning function.