喷涂法制备透明超疏水涂层及其性能研究

发布时间：2018-06-19 21:10

本文选题：超疏水 + 喷涂　；参考：《中国矿业大学》2017年硕士论文

【摘要】：超疏水现象广泛的存在于自然界中,如荷叶表面、鸟类的羽毛、水黾腿部等,具有防水、防污、自清洁的性能,而被应用于汽车玻璃、光伏发电等产业的超疏水涂层不仅要有其本身的疏水性,还要有优异的透光性。本文采用喷涂的方法,分别制备了SiO_2/PDMS涂层、SiO_2/硅树脂涂层和SiO_2凝胶涂层,研究其疏水性、稳定性和透光性,并分析水滴撞击超疏水表面的行为变化和能量变化,得到以下结论:制备的SiO_2/PDMS涂层和SiO_2/硅树脂复合涂层,能够实现超疏水表面,其中SiO_2/PDMS涂层和SiO_2/硅树脂涂层的疏水性、稳定性和透明性都受SiO_2含量的影响。两者的超疏水涂层稳定性和透明性都随Si O_2含量增大而有明显的下降,在SiO_2含量相同的情况下,SiO_2/硅树脂涂层有较好的稳定性,而SiO_2/PDMS涂层有较好的透明性;制备的超疏水涂层都具有很好的自清洁和抗冰冻性能。通过溶胶凝胶法制备的超疏水Si O_2涂层具有很好的透明性,但涂层的稳定性较差。超疏水涂层中具有明显的微纳粗糙结构,纳米粒子间的距离很大,储存了大量的空气。超疏水涂层具有很好的低粘附效果,水滴滴落到超疏水表面很容易弹起。水滴的铺展直径由初始高度和水滴大小决定;水滴撞击到超疏水表面的破碎取决于水滴的初始高度h和体积V,且破碎时存在一个临界值;水滴破碎后,破碎的小水滴带走大量能量,使得剩下的原始水滴弹跳高度下降,甚至离不开固体表面。综上所述,本课题通过喷涂法制备的涂层都具有超疏水性能,SiO_2/PDMS涂层和SiO_2/硅树脂涂层稳定性较好,透光性较差,而SiO_2凝胶涂层透光性较好,稳定性较差,并且通过分析水滴撞击超疏水表面的行为和能量变化,为透明超疏水涂层的具体应用提供理论指导。
[Abstract]:Superhydrophobic phenomena are widely found in nature, such as lotus leaf surface, bird feathers, water strider legs and so on, with waterproof, anti-fouling, self-cleaning performance, and has been used in automotive glass, The superhydrophobic coatings in photovoltaic power generation industry should not only have their own hydrophobicity, but also have excellent transmittance. In this paper, SiO2 / PDMS coating SiO2 / SiO2 / SiO2 gel coating was prepared by spray method. The hydrophobicity, stability and transmittance of SiO2 / PDMS coating were studied, and the change of behavior and energy of water droplet impact on superhydrophobic surface was analyzed. The results are as follows: the SiOstack _ 2 / PDMS coating and Sio _ S _ 2 / silicone composite coating can achieve superhydrophobic surface. The hydrophobicity, stability and transparency of Sio _ 2 / PDMS coating and Sio _ 2 / silicone resin coating are all affected by the content of Sio _ 2. The stability and transparency of the superhydrophobic coatings decreased obviously with the increase of SiO2 content. Under the same SiO2 content, the SiO2 / silicone coatings had better stability, while the SiO2 / PDMS coatings had better transparency. The superhydrophobic coatings have good self-cleaning and anti-freezing properties. The superhydrophobic Sio _ 2 coating prepared by sol-gel method has good transparency, but the stability of the coating is poor. The superhydrophobic coating has an obvious micro-nano rough structure, and the distance between nanoparticles is very large, and a large amount of air is stored in the superhydrophobic coating. The super hydrophobic coating has a good low adhesion effect, and droplets drop onto the super hydrophobic surface and spring up easily. The spreading diameter of the droplets is determined by the initial height and the size of the droplets. The breakage of the droplets to the superhydrophobic surface depends on the initial height h and volume V of the droplets, and there is a critical value when the droplets are broken. The broken droplets take away a great deal of energy, which reduces the bouncing height of the remaining water droplets and even the solid surface. To sum up, the coatings prepared by spraying in this subject all have super hydrophobic properties, such as SiO-2 / PDMS coating and SiO2 / silicone resin coating, which have better stability and poor transmittance, while SiO2 gel coating has better transmittance and worse stability. By analyzing the behavior and energy change of water droplets impacting superhydrophobic surface, this paper provides theoretical guidance for the concrete application of transparent superhydrophobic coatings.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB306

【参考文献】