Preparation And Superhydrophobic Properties Of Alkylated Graphene/Perfluoropolyether

When the aircraft is flying under low temperature and high humidity conditions,supercooled water droplets will condense on the fuselage and wing surface to form ice,which poses safety problems for the aircraft's flight and control.Applying a superhydrophobic coating on the aircraft surface is considered an ideal anti-icing strategy.However,the current super-hydrophobic coatings have problems such as wear resistance,poor chemical stability,and difficulty in maintaining hydrophobicity for a long time.In this regard,this article prepared alkylated graphene-based super-hydrophobic materials and super-hydrophobic coating(PKFE coating)composed of epoxy resin,perfluoropolyether oil,PTFE particles,in order to achieve better anti-icing effect.First,the surface functional groups of graphene oxide(GO)were modified by alkylation,and the reaction time was controlled to obtain different degrees of alkylated GO(LGO,HGO),which solved the problem of easy aggregation of GO solution.The modified octadecylamine-graphene oxide(ODA-GO)is evenly dispersed in the solution,and the higher the degree of alkylation,the more stable the solution.At the same time,ODA-GO has excellent amphiphilic properties and can self-assemble neatly at the oil/water interface.By setting different process parameters to prepare HGO water-in-oil Pickering emulsion,the droplet size can be adjusted,and the hollow-structured alkylated graphene-based super-hydrophobic material was prepared by freeze-drying technology.Secondly,the PKFE coating composed of epoxy resin,perfluoropolyether oil,and PTFE particles was prepared.The chemical structure and microscopic morphology of the PKFE coating were characterized and analyzed by SEM characterization technology and FTIR spectrum.Contact angle and dynamic contact angle experiments analyze the superhydrophobic properties of the coating surface.The surface of the prepared coating has a micro-nano grading structure,and then uses Na OH solution and HCL solution for immersion,sandpaper abrasion,adhesive tape and other analysis and testing methods to characterize and evaluate the corrosion resistance,abrasion resistance,bonding strength and other properties of the coating,To provide support for solving the problem of longterm maintenance of super-hydrophobic coatings.Finally,the prepared PKFE coating was combined with the alkylated graphenebased hollow structure material by spraying to improve the hydrophobic performance from the physical structure and chemical properties.Through the static contact angle test of water droplets,the icing test at a temperature of-10°C and a relative humidity of 80+5%,comparative analysis of uncoated aluminum plates,composite plates,etc.and alkylated graphene/perfluoropolyether the performance of the material to delay icing time,using the static icing and deicing performance test,the material obtained by the test has low ice adhesion;through the critical diameter of the water drop test,it is shown that small droplets can roll with a smaller critical diameter and drop from the coating surface,thereby reducing the amount of water hanging before freezing.It shows that the alkylated graphene/perfluoropolyether superhydrophobic material has excellent anti-icing performance.