Research And Performance Evaluation Of Anti-icing Coating For Transmission Lines

Transmission line icing refers to the phenomenon that water freezes on the transmission line and forms frost.As a vital lifeline project in China,the safe operation of transmission lines has received extensive attention.China is one of the countries with the most serious icing on transmission lines in the world,and it is of great significance to carry out anti-icing research.At present,researchers in China and abroad have carried out many explorations on the application of superhydrophobic materials in anti-icing,and found that the superhydrophobic surface with nano/microstructure can promote the rapid rolling of water droplets,delay ice nucleation,and reduce ice adhesion.However,poor mechanical stability has become a major challenge to hinder the practical application of superhydrophobic materials.The outstanding performance is that the cyclic icing/de-icing process destroys the micro/nano structure of the superhydrophobic surface,thereby greatly reducing the ice hydrophobicity.Therefore,the preparation of a low icing adhesion coating with mechanical stability and high icing stability is very meaningful for the current research of anti-icing coating.In this paper,two coatings with different anti-icing strategies were designed,namely,the ultra-low icing adhesion superhydrophobic network with passive anti-icing strategy and the antiicing and de-icing network with light / superhydrophobic synergistic effect under active/ passive anti-icing strategy.In this paper,we tried to semi-embedded silica nanoparticles into the micron-scale fibers of commercial polyamide networks.The area fraction of polyester mesh can be determined by changing the mesh number of polyamide mesh.The contribution of area fraction to ice bonding strength was studied.In general,the adhesion strength of ice decreases with the decrease of area fraction.The minimum icing adhesion of the prepared super-hydrophobic network can be as small as 1.9kPa,and the delayed freezing time can be as long as 1048 s.In addition,the combination of semi-embedded structure and hierarchical structure makes the super-hydrophobic network have excellent mechanical stability,which can withstand 20 icing/de-icing cycles,60 sandpaper wear cycles and 220°C temperature treatment.Therefore,this super hydrophobic network has a good application prospect in anti icing.Although the superhydrophobic coating based on passive anti-icing strategy has been proved to have some effect on anti-icing,the single passive de-icing strategy cannot always maintain its anti-icing/de-icing effect in the face of complex and changeable conditions,especially in the long rain and snow weather.Therefore,an active / passive anti-icing strategy is designed.In this strategy,photothermal active deicing was applied,and ultra-low icing adhesion superhydrophobic coating was used as passive anti-icing.On the one hand,candle ash endowed the surface with excellent photothermal properties,which could rapidly melt ice through sunlight irradiation.On the other hand,the super-hydrophobic network based on candle ash has excellent passive anti-icing performance.The minimum icing adhesion force can be as small as3.0 kPa,and the delayed freezing time can be as long as 1096 s.On this basis,the semiembedded structure makes the polyamide online candle ash coating have excellent mechanical stability,can resist sandpaper grinding,and superhydrophobic surface has excellent self-cleaning performance.This combination of active and passive anti-icing strategies provides a reference for the current anti-icing and de-icing methods of transmission lines.