Preparation Of Anti-/De-icing Coating Based On Flower-like Zinc Oxide

Since ice easily forms on the surface of space aviation,high-speed road,wind power and transmission communication equipment in cold weather,causing different degrees of harm,even serious economic losses.It is of great significance to develop effective anti-icing or de-icing technology.Despite superhydrophobic coatings with special surface wettability are paid more attention to the anti-icing,the hydrophobic properties could be destroyed in terms of the low temperature and high humidity environment,eventually resulting in icing on the surface.Therefore,it is necessary to fabricate the anti-icing and de-icing coating on the superhydrophobic surface.The flower-like ZnO,as a special 3D structural material,can be applied to the construction of superhydrophobic coatings owing to its significant rough structures from its many "petal" structures.Meanwhile,nano CuS can produce photothermal conversion to achieve photothermal de-icing property due to extremely strong absorption in the near-infrared region(700-1 100 nm).In this research,flower-like ZnO and flower-like ZnO@CuS were synthesized by precipitation method.The effect of reaction conditions on the morphology of flower-like ZnO and flower-like ZnO@CuS was investigated.Then,the superhydrophobic coatings were prepared with PDMS as low surface energy substances,epoxy resin as adhesives,and flower-like ZnO or flower-like ZnO@CuS as inorganic fillers.The preparation process of flower-like ZnO,flower-like ZnO@CuS and composite coatings were optimized based on the hydrophobic and wear resistance performance of the composite coatings.Finally,the environmental stability,anti-fouling,anti-icing and de-icing properties of the superhydrophobic coatings were investigated.The results are as follows:Flower-like ZnO nanostructures with the diameters of 4～5 μm assembled with ZnO nanosheets were successfully fabricated by precipitation method.The incorporation of flower-like ZnO nanostructures could make contribution to the formation of micro-nano rough structures on the surface when the zinc source was zinc acetate dihydrate,the concentration of sodium citrate was 0.24 mol/L,and the concentration of NaOH was 0.7 mol/L.And the ER/flower-like ZnO/PDMS composite coating with the water contact angle of 161.3±2.3° and the sliding angle of 0.8±0.1° were obtained,when the mass ratio of ER to flower-like ZnO was 5:13,the mass ratio of PDMS to flower-like ZnO was 1:15.The coating retained its superhydrophobic properties after 40 times of friction.Meanwhile,the coating exhibited the excellent air resistance,UV stability and anti-fouling performance.Moreover,it had outstanding dynamic anti-icing performance via delaying the static icing time of water to 15 min below-10℃.However,the melting time was prolonged instead of shortening.Using flower-like ZnO as the template,the flower-like ZnO@CuS nanostructures with the diameters of 5～6 μm were successfully prepared by precipitation method.The flower-like ZnO@CuS with regular morphology could improve the roughness of coating when using CuCl2·2H2O as the copper source,Na2S·9H2O as sulfur source and the amount of 0.05 mol/L.The ER/flower-like ZnO@CuS/PDMS composite coating with the water contact angle of 163.5±1.9° and the sliding angle of 3.1±0.2° were obtained,when the mass ratio of ER to flower-like ZnO@CuS was 5:15,the mass ratio of PDMS to flower-like ZnO@CuS was 1:10.More critically,its superhydrophobic properties remained after 40 times of friction.Compared with ER/flower-like ZnO/PDMS composite coating,this superhydrophobic composite coating could delay the icing time of water droplets to 13 min at-10℃.Under the photothermal action of flower-like ZnO@CuS,the melting time ice beads on its surface could be obviously shortened to 2.4 min,showing excellent de-icing performance.Meanwhile,the composite coating had excellent dynamic anti-icing performance,air stability and anti-fouling performance.