Fabrication Of The Fluororesin-based Composite Weatherproof Superhydrophobic Coating And Its Property Study

The phenomenon that the static contact angle between solid surface and water is greater than 150°is called superhydrophobic.Because of its unique surface wettability,superhydrophobic coating is widely used in waterproof,antifouling,self-cleaning and oil-water separation fields.However,the surface of the superhydrophobic coating is fragile,vulnerable to environmental erosion,friction and wear,ultraviolet aging and other damage which cause the loss of hydrophobic characteristics.In addition,the harsh requirements of preparation conditions,equipment as well as substrate also restrict the application of the superhydrophobic coating in actual production.In this study,fluorine resin?FEVE?was used as the base material,methyl methacrylate?MMA?was on modification to improve its mechanical properties the via co-solvent method.Heptafluorotrimethoxysilane?FAS-17?modified TiO₂/Al₂O₃composite particles were mixed to build the micro/nano double scale coarse structure.Champions league action of?-aminopropyltriethoxysilane?KH550?and hydrolysis catalytic crosslinking copolymerization preparation methods was used to fabricate the superhydrophobic coating that could be quickly solidified.TiO₂/ZrO₂ composite sol was prepared via sol-gel method to improved UV resistance of the coating.In addition,the isobutyltriethoxysilane and acrylic resin was mingled by co-solvent method to improve the base weatherability.Hydrothermal modified ZrO₂/Al₂O₃ composite particles were doped to prepare the superhydrophobic coating with ultraviolet resistance,temperature resistance,certain weather resistance and acid-base resistance.The coating could rapidly construct superhydrophobic surfaces on a variety of solid surfaces without a use of spraying,uniform rubber and other technical equipment.?1?The influence of MMA and TiO2/Al2O3 composite particle doping on coating performance was investigated and the optimum process flow was explored.High bond energy and low surface energy components such as Si-O-Si long chain were introduced into the original C-F skeleton structure of fluororesin by co-solvent doping and catalytic cross-linking copolymerization.The CA of the superhydrophobic coating can be reached 160°±2.2°.After 30 days of high temperature treatment for 60?,the CA was as high as 155.5°±0.6°.After 30 days of low temperature treatment for-20?.And the CA was 151.4°±0.6°for 24 h treatment of acid solution.But the UV and aqueous alkali resistence of the coating was poor.?2?The amorphous dispersed nano TiO2/ZrO2 composite sol was prepared by sol-gel method with tetrbutyl titanate and zirconium n-butanol as precursors.The preparation process and ratio were optimized,and the composite sol was dispersed evenly in the coating substrate by co-solvent doping,so as to improve the uv tolerance of sol.?3?The FEVE/MMA substrate was modified by doping ZrO₂/Al₂O₃ composite particles that were modified by FAS-17,self-made TiO2/ZrO2 composite sol,isobutene trimethoxysilane and acrylic resin via co-solvent doping method,the ratio and process were optimized.The CA of the superhydrophobic coating fabricated can reach 162°±1.6°.The contact Angle after 500 mm friction can be up to 154°±1.2°.And which were158°±1.5°and 156°±0.8°respectively after treatment at 120?and-20?for 15days.And the water contact angles were 152°±1.2°,141°±1.4°and110°±1.8°respectively after 24h treatment in acid,alkali and salt solutions.In this experiment,the substrate applicability,weather resistance and wear resistance of polymer-based composite superhydrophobic coating were optimized,which provided a path for the rapid application of superhydrophobic coating on a large area of solid surfaces...