Fabrication Of Several Superhydrophobic Coatings And Their Anti-icing Properties

Nowadays, artificial superhydrophobic surfaces have made great achievements in both laboratory preparations and practical applications. It is still argued that whether the superhydrophobic surfaces possess the expected anti-icing properties or not. Therefore, several kinds of superhydrophobic surfaces were prepared via different methods and their anti-icing properties were studied systematically. Furthermore, the surface wettabilities, microstructures, chemical components, self-cleaning properties and stabilities were also investigated in detail. The main research contents and results are listed as follows:1. A set of self-designed apparatus is built to study the ice behavior. It can be achieved that the icing behavior on the superhydrophobic surface is monitored in the temperature range of 0 ~-25 °C, wind speed range of 0 ~ 5 m/s.2. Stearic acid silver superhydrophobic surface has been prepared by silver nitrate and stearic acid. The contact angle is 164.5 °,the rolling angle is 3.1 °. Stearic acid silver superhydrophobic surface is easy to be coated, resistant to acid and alkali, easy to be repaired. Under the small ice device in the laboratory,it is found that Stearic acid silver superhydrophobic surface has the effect of delaying freeze at-5 °C、-10 °C and-15 °C. At-20 °C, water on the superhydrophobic surface and the common glass surface almost freezes in the same time.In a large ice wind tunnel laboratory conditions, Superhydrophobic surface can significantly reduce the amount of ice and Ice forms are sparse discrete icy particles At-5 °C,-10 °C and-15 °C. At-20 °C, compared with the ordinary surface, the icing behavior of superhydrophobic surface has no obvious difference.3. The modification of hydrophobic silica mixed with silicone rubber in solution, and then dip-coating film. After curing,RTV/SiO2 composite superhydrophobic coating was obtained. The contact angle is 165 °, rolling angle is 1.1 °. The study found that RTV/SiO2 composite superhydrophobic coating has high stability, can withstand ultraviolet irradiation and the soak of corrosion solution. Ice behavior study found that RTV/SiO2 composite superhydrophobic coating do not freeze or delay freezing at-4 °C,- 8 °C and- 12 °C,under the condition that the tilting angle of the table is 15 °. At-16 °C,the icing behavior of superhydrophobic surface is almost the same as the ordinary surface.4. The transparent superhydrophobic coating was prepared with OTS-SiO2 particles by spraying or dip-coating. Nano-SiO2 reunited into a continuous island and formed micro/nano dual structure.The Contact angle is 163 °, the rolling angle is less than 2 °. The research found that the light transmittance of the superhydrophobic surface is greater than 81.5%.And it has good self-cleaning property and corrosion resistance.The icing behavior of transparent superhydrophobic coating was systematically studied, in wind speed of 0 m/s and 3 m/s, respectively. Results showed that superhydrophobic surface was prevented from icing at-5 °C in any wind speed. Under the conditions of-10 °C and the wind speed of 3 m/s, Superhydrophobic surface can significantly delay icing.At-15 °C, Superhydrophobic surface has no obvious effect of anti-icing.