Reach On Preparation And Performance Of Wear Resistant Superhydrophobic Coating

Superhydrophobic materials have attracted wide attention because of their excellent liquid repellency.Scientists have been using various means and methods,such as template method,etching method,electrospinning method and so on,to prepare superhydrophobic surfaces,and have good applications in anti-corrosion,self-cleaning,oil-water separation and fluid drag reduction.Since the fragile micro/nano structure of the superhydrophobic surface is damaged even if it is subjected to a small stress,the superhydrophobic surface has extremely poor wear resistance,which limits its application.In this paper,from the perspective of improving the wear resistance of the superhydrophobic coating,a superhydrophobic coating with excellent wear resistance was prepared through a two-step spraying method and based on TiO₂ micro-nanospheres.The corrosion resistance and self-cleaning properties of the coating were also investigated,as follows:(1)Using silicone modified polyurethane and hydrophobic SiO₂ nanoparticles as raw materials,a two-step spraying method was used to prepare a super-hydrophobic coating.The chemical composition of the substrate and the surface morphology of the coating were characterized by testing methods such as FT-IR,XPS and SEM,and the influence of the organic silicon content and the preparation process conditions on the coating performance was investigated.The results are as follows:Silicone successfully modified the polyurethane.When the silicone content is 30%,the hydrophobicity of the PU substrate reaches 106.2°.The prepared SiO₂/Si PU coating has a micro-nano rough structure and has superhydrophobic characteristics.When the pre-curing time of the substrate is 20 minutes and the silica dispersion is sprayed 3 times,the overall performance of the super-hydrophobic coating is the best,and it can withstand 30 cycles of wear.(2)Firstly,a kind of TiO₂ particles with micro-nano structure was prepared,and then combined with epoxy resin by the method of scraping-dissolving-modification to obtain a superhydrophobic surface.Through SEM,XRD,Raman spectroscopy and XPS and other characterization methods,it was determined that the synthesized TiO₂ microspheres were the target products,and the microspheres had a micro-nano hierarchical structure.When the mass ratio of TiO₂ to ER is 4:6?2:8,soaked in toluene solvent for 15 minutes and modified by low surface energy dimethyldichlorosilane,the coating has obtained superhydrophobicity.And the coating has excellent abrasion resistance.It can wear 2000mm under a load of 200g on 1000mesh sandpaper to lose its superhydrophobic properties,and it can withstand the impact of 500g of sand from a height of 50cm and 100 consecutive peelings of the tape.(3)Using the prepared superhydrophobic coating as the research object,using sand to simulate solid pollution,and methylene blue sewage to simulate liquid pollution,when investigating the antifouling ability of the coating,it was found that:The coating has low adhesion to sand and sewage and exhibits good self-cleaning properties.When using the electrochemical workstation to investigate the corrosion resistance of the coating,it was found that:The protection efficiency of the coating on carbon steel is 98%.Soaked in 3.5%Na Cl solution for144h,it still has a high impedance modulus,and the coating has excellent anti-corrosion performance.