Preparation Of A Super-hydrophobic And Self-cleaning Coating For An Anti-icing Transmission Line

The security of electricity and communication network was threaten by the ice and snow on the transmission line. The ice can cause the collapse of transmission lines, flashover insulator and other major incidents, so the safe operation of the power system have serious hazards. Therefore, the research and development of anti-icing thchnology for transmission lines has become an important and urgant tasks. Currently, the methods of anti-icing on the transmission line have about 30 species. On the transmission line disater, the facus should be placed on prevention and control. Therefore, the transmission lines coated with the super-hydrophobic coating can strive to long-term efficient, convenient and economical solution the problem is a good idea. Currently, the main method to construct the super-hydrophobic coating have template, sol-gel, vapor deposition and so on, but most of these methods need complex preparation or extensive eauipment and are difficult to be supplied in large area. So, the rsearch for a low cost and simple preparation method of super-hydrophobic coating becomes very significant. In this work, the super-hydrophobic coating was prepared by particle-filling method based on nanometer SiO₂ and TiO₂ as fillers, fluoropolyacrylate as binder. The method avoid cumbersome traditional methods of complex preparation process or high production costs, and trying to simplify the produciton process and improve the coating's performance.In this paper, methyl methacrylate, butyl acrylate, acrylic acid styrene and fluorine-containing monomer were used to prepare the fluoropolyacrylate by the free radical copolymerization. The amount of fluorine monomer, reaction temeprature, monomer concentration, addition time and the glass transition temperature were investigated on the synthesis, the results showed that when the amount of fluorine monomer was 5%, reaction temperature was 85℃, monomer concentration was 50%, addition time was 2.5h and glass transition temperature was 60℃, the products had the best hydrophobicity.The characterization of the product by IR showed that the the polymerization reaction is complete and the fluorine-containing monomer was fully involved in the reaction.The super-hydrophobic coating was prepared by particle-filling method based on nanometer SiO₂ as fillers and fluoropolyacrylate as binder. The impact of the added amount of nanometer SiO₂ on the final surface hydrophobicity was explored and the causes were analyzed. The characterization of the product by SEM showed that the surface of coating exhibited a crater-like topology composed of processes and holes with diameter of 500nm. The AFM showed the asperity shapes and density of the rugosities with diameter of 20nm distributed on the particle surface.In this work, a little amount of nanometer SiO₂ was replaced by nanometer TiO₂ to make the coating has photocatalyticity. The impact of the added amount of nanometer TiO₂ on the photocatalyticity was explored and the causes were analyzed. The surface of coating was smeared by oil pollutant and then dried. The changes of CA on the oil pollutant surface under a low pressure mercury lamp were determined as a function of irradiation time. The results indicated that the photocatalytic degradation of the oil could regenerate the hydrophobic surface. It meant that the small amounts of n-TiO₂ mixed in the coating could puriy the attached oil pollutants under UV light irradiation and enhance its use value.In the simulation of ice, adhere force of faces of different hydrophobicity and ice was measured one by one. The results indicated that the increase of hydrophobicity can reduce the force. When the coating had super-hydrophobicity, the adhere force can drop about 80% and the performance of anti-ice improved significantly.In summry, the preparation of super-hydrophobic coating by particle-filling method was simple and had low coat, high maneuverability. The addition of nanometer TiO₂ made the coating has performance of self-cleaning which was conducive to maintaining the longevity of its hydrophobicity. After being coated with this super-hydrophobic coating, the adhere force between ice and substract can be decreased obviously. Therefore, this work provides a feasible way of think to prevent natural disasters of transmission line.