Hydrophilic and oleophobic easy-to-clean organic coating and preparation method thereof

Abstract

The invention discloses a hydrophilic and oleophobic easy-to-clean organic coating and a preparation method thereof. The organic coating is obtained by curing an organic solution by a curing agent, the organic solution is a fluorine-containing polyurethane modified epoxy resin solution formed by carrying out a reaction on fluorine-containing polyurethane and an epoxy resin in an organic solvent, and the fluorine-containing polyurethane and the epoxy resin form a semi-interpenetrating network structure formed through the bonding of chemical bonds. A micro area with uniformly distributed hydrophilicity and oleophobicity is constructed on the surface of an object to be coated through the semi-interpenetrating structure and low surface performances of fluorine, so the hydrophilic and oleophobic easy-to-clean organic coating is formed. Experiments prove that the lowest contact angle between the organic coating and water can reach 15DEG, and the highest contact angle between the organic coating and oil can reach 90DEG, so water can thoroughly displace oil stains on the surface of an original solid, and an easy-to-clean effect is reached.

Description

technical field [0001] The invention belongs to the technical field of surface coatings, in particular to a hydrophilic and oleophobic easy-to-clean organic coating and a preparation method thereof. Background technique [0002] Wettability is an important characteristic of solid surfaces. From a macroscopic point of view, wetting is a process in which a fluid replaces another fluid from a solid surface; from a microscopic point of view, a fluid that wets a solid, after displacing the fluid on the original solid surface, itself is in harmony with the solid surface. In the contact at the molecular level, there are molecules without replacement between them, such as water displacing air on the glass surface and expanding. If on a surface, water can replace the oil on the original solid surface, and there are no oil molecules between the water and the solid surface, the effect of easy cleaning can be achieved. [0003] At present, there are two main categories of easy-to-clea...

AI Technical Summary

Problems solved by technology

Although silicone has a strong repellency to water, it is not oil-proof and has a short service life. After 6-12 months, its water repellency will be greatly reduced

Organic fluorine can be both hydrophobic and oleophobic, but the contact angle of water is generally around 90°, which can neither make water droplets roll off nor replace the position of oil stains, and the easy-to-clean effect is not very good

[0006] In addition, the Chinese patent application with the publication number CN101870187A discloses an easy-to-clean organic coating and its preparation method. The method is to perform low-temperature plasma fluorination treatment on a hydrophilic substrate, which also achieves the easy-to-clean surface of the hydrophilic and oleophobic coating. cleaning effect, but this method uses a double-layer film to prepare an organic coating, the first layer is a hydrophilic coating, the second layer is an oleophobic coating, and a low-temperature plasma treatment technology is used in the preparation process, so the preparation process is complicated. Difficult to achieve large-scale production and application