Fabrication And Characterization Of Wear-resistant Superhydrophobic Coating On Glass Substrate

Superhydrophobic glass coating,with advantages of self-cleaning,anti-icing,antifouling and anti-corrosion,has various potential applications in architectural glasses,automotive glasses,solar cell and other industries.However,there is no applicable superhydrophobic glass coatings in the market until now,the reason lies on the strict requirements to transmittance,wear resistance and superhydrophobicity of superhydrophobic glasses,which are incompatible intrinsically.The contradiction has become the barrier of the practical application of superhydrophobic coatings.Therefore,constructing a robust and wear-resistant superhydrophobic coating on glass substrate is the key of the application of superhydrophobic glass.Here,we fabricated a transparent,wear-resistant superhydrophobic coating with special component and structure via phase separation process and sol-gel process.The main contents are as follows:1.The SiO2 porous coating with strong adhesion to glass substrate was prepared with epoxy resin and silica sol,which shows great wear resistance,and the competition mechanism of phase separation process and sol-gel process was explored preliminarily.After modified with fluorosilane,the static contact angle of the coating is 130.8± 1.4°,and the contact angle keeps above 130°after 1500 cycles of abrasions with an abrasion partner of flannel under 30 kPa.2.A three-dimensional(3D)porous coating with“Mace-like" hierarchical structure has been prepared.The amino-SiO2 nanoparticles and silica sol were utilized to construct "Mace-like" SiO2 hierarchical skeleton by reaction induced assembly via the sol-gel process and phase separation process.After modified with fluorosilane,the initial water contact angle of the coating with "Mace-like" hierarchical networks is 155±1.7° and the sliding angle is less than 6°,which means great superhydrophobicity and self-cleaning ability.The water contact angle keeps larger can 130° after 1500 cycles of abrasion under 30 kPa.The coating has considerable visible transmittance,although there is a certain haze on the surface of the film due to the Mie scatter of micron pores.3.The reinforcement of wear resistances of the 3D porous SiO2 coating with"Mace-like" framework were explored by analyzing the effects of different structures on the wear resistance of superhydrophobic coatings.It is confirmed that the 3D porous coating with "Mace-like" framework can enhance the wear resistance of the superhydrophobic coating via the synergistic effects of the Si-O-Si covalent bonding and "Mace-like" 3D hierarchical structure.The coating has robust adhesion to the substrate,which improves the wear resistance of the coating observably.The strategy presented here is facile and convenient,which is suitable for the substrates with different shapes and sizes.It is useful for the practically application of the superhydrophobic glass coatings.