With the development of The Times, people's invention is more and more magical, super hydrophobic coating is one of them, the use of the product can make the surface of the pollutants or dust can be gravity, rain or wind and other external forces automatically removed or degraded.What factors will affect the coating hydrophobicity, let us know about it.

1 hydrophobic principle

The wettability of water on a solid surface is related to the state of the solid surface.For different permeability models, the roughness of solid surface is different. Water is usually affected by Young s equation on an ideal smooth plane.When the solid surface has a certain roughness, the equation is not applicable to the wettability model of rough surface mainly including Wenzel model.The model has an important assumption: it is assumed that liquid can always fill grooves on rough surfaces, which does not seep liquid into the rough mechanism.In this case, the Cassie-Baxter model is mainly used, which assumes that the droplet base on the rough surface is compound contact, and the apparent liquid-solid interface is actually composed of solid and gas.

2 Factors affecting the hydrophobicity of coating

The hydrophobicity of the coating is mainly determined by the chemical composition of the coating and the physical structure of the surface. The chemical composition mainly affects the hydrophobicity of the coating as a chemical group with low surface energy.

At present, the widely used hydrophobic coating has fluorine coating, silicon coating and paraffin fluorine coating. The surface energy of fluorine group in fluorine coating decreases with the substitution of fluorine atom number, so fluorine atom number increases the hydrophobic function of the coating.The silicon-containing coating mainly forms special structures on the surface of the coating by sol-gel method, and silane monomers with a certain length of carbon chain can also be introduced to increase hydrophobicity. Paraffin is a mixture of straight-chain alkanes with 16-30 carbon atoms, which has low surface energy and water will not penetrate into its surface.

When the organic coating contains larger hydrocarbon groups, it also has lower surface energy and a certain degree of hydrophobicity.The physical structure of the surface has a great influence on it.The hydrophobic coating on the surface of biological surface is mainly constructed by a special knot.Structurally, nanoparticles are constructed on the surface of particles to obtain micro/nano structure and achieve hydrophobicity.

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