Nowadays,there are several ways to prepare transparent superhydrophobic films on the surface of photovoltaic glass covers,but the nanoparticles in coating system are mostly modified by fluorosilane,which might threaten environment and human health.In this research,a method of preparing transparent superhydrophobic coating by spraying non-fluorinated nanoparticles is proposed.SiO2 nanoparticles modified with octadecylamine(ODA)are adhered on the semi-cured waterborne polyurethane(WPU)layer to provide low surface energy and roughness.The non-fluorinated modifier hexamethyldisilazane(HMDS)is used to further enhance the hydrophobic performance of the coating.Experimental results show that within the wavelength range of 400 to 700 nm,the average transmittance of the EW3 coating is 90.63％,and its average static water contact angle(WCA)is 155.8°.The self-cleaning test result shows that there is no dust residue on the surface of the EW3 coating.The durability test result indicates that the EW3 coating exhibits excellent adhesion,corrosion resistance,radiation resistance and resistance to water flow impact.This environmental friendly and cost-effective preparation method provides a new approach for the preparation of environmental friendly transparent superhydrophobic coatings on photovoltaic glass and other fields.
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