Preparation And Anti-Icing Performance Of Hierarchical Superhydrophobic Coating

The anti-icing coating based on superhydrophobic materials has low surface energy and micro-nano roughness,which can effectively reduce the retention of water droplets on the surface of the coating and reduce the adhesion force.It is considered to be an effective deicing method.However,multiple deicing can easily damage the coating and cause its failure.Therefore,the development of high-durability superhydrophobic coatings has important applications and academic value.At present,there are two main methods to improve durability: to improve the adhesion between the substrate and the hydrophobic(SH)layer through covalent bonding,cross-linking and other methods,and to build a rigid microstructure frame armor to protect the hydrophobic nanostructure.The former is generally suitable for a mild external environment.However,because the hydrophobic components of the outer layer are still vulnerable to severe mechanical wear or other damages,they show moderate durability.The latter usually uses photolithography to manufacture the microstructure armor on the substrate,so the substrate is limited and the operation difficulty and cost are increased.Taking advantage of the excellent adhesion of polymers and the superhydrophobicity of inorganic components,it is an effective method to construct 3D overall durable superhydrophobicity.However,the liquid polymer resin easily wraps the particles during use,which ultimately leads to reduced hydrophobicity and durability.This paper considers that if the polymer phase exists in the form of microspheres,it has good monodispersity,large specific surface area,good adsorption,and good material affinity,which can avoid the situation of liquid polymer coating hydrophobic particles.More importantly,the polystyrene microspheres will self-assemble into a certain structure during the solvent volatilization process,and are easy to soften and bond to each other at a suitable temperature,so they can be used as a very good skeleton.In this article,we use the co-spraying method and the hot pressing process to combine the excellent adhesion of polystyrene microspheres and the superhydrophobicity of inorganic components to construct a 3D overall durable superhydrophobic surface.Through two linear wear damage evaluation methods,the coating can withstand 280 cycles without failure when the coating is damaged by bidirectional linear wear under a pressure of 6 k Pa,and the coating can withstand280 cycles without failure in the unidirectional linear failure.No matter it is damaged by normal temperature water or low temperature water,our coating can maintain 14 hours without failure;the results of ice resistance show that compared with blank glass,water droplets on PS MPs/F-CNPs coating delay the formation Ice time is up to 30 times;ice adhesion test shows that PS MPs/F-CNPs composite superhydrophobic coating has very weak ice adhesion,and a slight deformation can cause the ice to fall off,even if it is worn under a pressure of 6 k Pa 200 The ice adhesion force on the surface is only 28.9 k Pa.The surface ice coating experiment shows that the surface of the PS MPs/FCNPs superhydrophobic coating is difficult to be iced.The amount of ice coating for 4 hours is 1/9times that of the blank glass sheet.All of the above shows that our PS MPs/F-CNPs superhydrophobic coating has good ice resistance.