Study On The Construction And Properties Of Amphiphobic Coatings Based On Multi-size Nanostructure Regulation

The amphiphobic coating developed by bionics has broad application prospects in the fields of self-cleaning,oil stain prevention,anti-icing,lubrication and drag reduction.Currently,research on amphiphobic coatings mainly focuses on constructing and characterizing surface micron structures based on the theory of surface roughness coefficient.Due to the high specific surface area characteristics of nanoscale structures,even small changes in surface nanoscale micromorphology can result in significant variations in surface roughness coefficients,which subsequently lead to significant variations in coating amphiphobic properties.In this paper,a multi-size amphiphobic coating was constructed using a method of regulating the nanostructure at multiple scales.The influence mechanism of multi-scale regulation on surface morphology characteristics and coating amphiphobic behavior at the nanoscale was studied.The main research content and results are as follows:SiO₂ nanoparticles were prepared using the sol-gel method,and the influence and mechanism of the relative volumes of deionized water and absolute ethanol on their particle size were studied.It has been found that the volume of absolute ethanol can be adjusted to prepare amorphous SiO₂ with strong particle size control and good monodispersity.With an increase in the volume of absolute ethanol,the particle size of SiO₂ nanoparticles gradually decreases.The particle size can be precisely adjusted within a range of 21nm-411nm,and it follows an"S"curve distribution with changes in the volume of absolute ethanol.Three amphiphobic coatings with different combinations of nanostructures at various sizes were prepared by nanocomposite spraying,and the influence mechanism of key factors such as size,density and number of nanostructures at different scales on the amphiphobic performance was studied.It has been found that in the single-size structure,as the density of nanoscale mastoid structures on the surface increases,the roughness coefficient of the coating surface also increases,leading to a gradual improvement in amphiphobic performance.With the introduction of the dual-size structure,the roughness coefficient of the coating surface is further increased,resulting in greatly improved amphiphobic performance.In particular,when using a combination scheme of 400nm:150nm at a ratio of 1:3,water and cetane contact angles reach 166°and 150°respectively.In the three-size structure,the 40 nm particles are easily coated onto the micron structures.The addition of these particles reduces the concentration of the other two particle sizes,resulting in a decrease in nanoscale mastoid structures and amphiphobic properties.In addition to good hydrophobic and oleophobic properties,dual-size coatings also exhibit excellent applicability,thermal stability,chemical stability,and self-cleaning properties.The interface regulation of the amphiphobic coating is achieved through the use of epoxy resin and light-curable resin binder.The study investigates how this interface regulation affects the amphiphobic performance,mechanical stability,thermal stability,and corrosion protection performance of the coating on light metal surfaces.It has been found that the mechanical stability of the coating is greatly improved after adjusting the interface between the two binders,and the superhydrophobic properties of the coating can still be maintained at over 150°even after long-distance sandpaper wear.The interface layer improves the thermal stability of the amphiphobic coating,and the light-curing resin is more pronounced.Due to the synergistic effect of the interface layer and the amphiphobic coating,the protective effect of aluminum alloy and magnesium alloy is significantly improved,and it can be seen from the results of electrochemical experiments that the polarization resistance of aluminum alloy and magnesium alloy is increased by nearly 6 and 9 orders of magnitude compared with the metal after micro-arc oxidation after binder interface control.