| Inspired by the self-cleaning effect of lotus leaf,the superhydrophobic coatings have favorable application prospects in liquid transportation,device anti-icing,biosensing,ship hull drag reduction and so forth.However,the unavoidable friction during the practical application process could damage the nano/micro-structures and lead to the loss of its superhydrophobicity,which severely limits the practical application of superhydrophobic coatings.In this work,aiming at the defects of the insufficient mechanical and hydrophobic durability of superhydrophobic coatings,we took the interface enhancement and microstructure design as the starting point to explore the relationships between interface strengthening,fine structure design,microstructure repairability and the mechanical stability and hydrophobic durability.Various durable superhydrophobic coatings with stable mechanical properties have been prepared by spraying processes.The main research contents are as follows:（1）To solve the poor film formation and adhesion problems of UV-cured superhydrophobic coatings and explore the influence of interface strengthening on the mechanical stability,the interface compatibility between UV-curable resin and inorganic particles,and the bonding strength between the coating and the substrate were improved by the in-situ growth and chemical grafting methods.The research results demonstrated that the coating possessed high adhesion with substrate and can still maintain its superhydrophobicity after 1500 times abrasion,which indicated that the interface strengthening method can enhance the structural stability of the superhydrophobic coating surface.（2）The highly wear-resistant superhydrophobic EP composite coating was successfully prepared by the dual interface enhancement combined by physical high pressure melt extrusion and chemically modified sol-gel,which was beneficial to improve the interface bonding strength between EP and PTFE,among graphene and Si O2particles.The effects of dual interface enhancement and special particles morphologies on the surface structures and hydrophobic stability of the coating were investigated.The research results demonstrated that the prepared stable EP composite coating surface can still exhibited excellent superhydrophobicity even after the repeated rubbing,scratching or repeated bending tests.In addition,the special"nano-micro-nano"structures can provide double gas film protection for the underwater superhydrophobic coating,enhancing the hydrophobic durability effectively.（3）In order to further improve the hydrophobic stability of the superhydrophobic coating under harsh conditions,the azodicarbonamide foaming agent and high aspect ratio CNF were utilized to design a fine"egg shell-network"structure on the PVDF coating surface.By exploring the influence of special morphology on the hydrophobic durability,it is found that the prepared coating can withstand harsh environments,such as high-pressure water flow of 250 k Pa,hot water immersion or 98%H2SO4solution washing.Moreover,the combination of the non-penetrating porous eggshell structures and the network structures can not only decrease the damage of mechanical properties caused by adding excessive inorganic particles,but also effectively enhance the anti-corrosion performance of the prepared coating.（4）In view of the problem that it is difficult to repair the damaged nano/microstructures,a durable superhydrophobic coating with nano/microstructure repair function was constructed by exploiting the synergistic effect of thermal phase change palm wax,elastic fluoroelastomer particles and high-elastic fluorosilicone resin.When the prepared coating suffered from the mechanical damage,such as friction,scratching or ball impact,the wax on the coating surface can occur the solid-liquid phase transition through a simple heating treatment,and recrystallize to form nano-sheet structures on the elastic repair microstructure,realizing the restore of surface nano/microstructures and superhydrophobic properties. |
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