TECHNOLOGY FOR CREATION OF HYDROPHOBIC COATINGS
Keywords:
hydrophobicity, nanomaterials, Wenzel state, Cassie–Baxter stateAbstract
To date, there is a universally recognized need for hydrophobic composite materials, the production of which would be beneficial, and the application is effective. The first water repellents appeared in the construction industry about 40 years ago. In general, these were organosilicon fluids based on polyhydrosiloxane, sodium ethylsiliconate, sodium methylsiliconate. Such compounds have certain negative qualities, now they have practically disappeared from the market. Hydrophobization of the surface layer of various materials is an actual scientific task of modern materials science and intensive research is being carried out in this field. Great practical interest is associated with the creation of hydrophobic and superhydrophobic coatings on glass surfaces, anti-icing coatings of hydrophobizing coatings in the textile and construction industries. Glass, currently one of the most common materials that is used in modern society, mirrors, glasses, glass vehicles and much more. The use of glass is caused by one drawback, there is a problem of their contamination and sticking of water drops on its surface, which is accompanied by inconvenience in their use. Two mechanisms of hydrophobization of coatings on glass surfaces are possible. The first is to improve the microstructure of the surface of glass products. The first is to improve the microstructure of the surface of glass products. The study of the glass surface under a microscope shows that the microstructure of the surface contains irregularities with peaks and dips that prevent the movement of liquid droplets. The hydrophobic composition fills these irregularities, and drops of liquid easily slip off the surface of the glass. The second mechanism is due to the fact that, in addition to smoothing the glass surface, the surface tension decreases. The hydrophobic properties of the surface are characterized by the wetting angle between the surface and the drop at the point of contact. The larger the wetting angle, the less the wet ability of the surface, and the easier it is for the liquid to drop from it. The proposed paper discusses the theoretical foundations and reviews the ongoing research in the field of coatings with a hydrophobic property.
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