Preparation and application of super-hydrophobic/oleophobic coating layer with excellent performance

Abstract

The invention relates to preparation and application of a super-hydrophobic / oleophobic coating layer with excellent performance, wherein the preparation comprises the steps: dispersing nanoparticles and cellulose in an alkaline substance-containing alcoholic solution, and adding tetraethyl orthosilicate and fluorine-containing organosilane for hydrolytic coating to form a solution A; dispersing epoxy resin in an alcoholic solution to form a solution B; uniformly mixing the solution A and the solution B, and then adding tetraethyl orthosilicate and fluorine-containing organosilane to react to generate polysiloxane, to obtain a solution C; dissolving a fluorine-containing amine compound in an alcoholic solution to obtain a solution D; and uniformly mixing the solution C and the solution D, spraying the mixture on a substrate, and curing to obtain the product. A multi-stage micro-nano hierarchical structure is constructed; the super-hydrophobic / oleophobic coating layer has good chemical stability, can achieve a complete repelling effect on N,N-dimethylformamide liquid drops (34.4 mN / m), has a contact angle of 120 degrees on n-hexadecane (27.1 mN / m), is simple in preparation method, can be sprayed on a large scale, and paves a road for industrialization of the super-hydrophobic / oleophobic coating layer.

Description

technical field [0001] The invention belongs to the field of preparation of superamphiphobic materials, and in particular relates to the preparation and performance research of a superhydrophobic / oleophobic coating with excellent performance. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Generally, a surface with a static contact angle of water droplets greater than 150° and a sliding angle of less than 10° on a solid surface is called a superhydrophobic surface. Inspired by the self-cleaning effect of lotus leaves in nature, super-hydrophobic coatings have been developed rapidly. People imitate the special surface structure of lotus leaves to construct super-hydrophobi...

AI Technical Summary

Problems solved by technology

[0004] However, with the rapid development of industry, a single superhydrophobic property can no longer meet people's actual needs. Coatings with both superhydrophobic and superoleophobic / oleophobic properties have attracted great attention from researchers. The preparation of oleophobic / oleophobic surfaces has always been a difficult problem, because its surface tension is much smaller than that of water, so it is easier to wet the contact surface and contaminate the surface. Construction puts higher demands on

And in practical applications, most super-lyophobic coatings will be rubbed by external contacts, which will damage the structure of the coating and low surface energy substances, and even cause the coating to lose its lyophobic properties. The challenge of coating mechanical property stability

In addition, the lyophobic coating may also be used in harsh environments such as strong acid, strong alkali and high and low temperature, which is also a challenge to the stability of the coating.

[0005] At present, most of the research on super-oleophobic / oleophobic coatings is concentrated in the laboratory stage, and the preparation cost is high, the steps are cumbersome, the operability is not strong, the preparation efficiency is low, it is difficult to prepare on a large scale, and the coating is lyophobic. Adhesion with the coating is often incompatible, that is, the lyophobic coating is not wear-resistant, and the wear-resistant coating is difficult to lyophobic. The adhesion of the coating is always the biggest barrier to the industrialization of the coating.

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