Preparation method of super-hydrophilic self-cleaning coating based on cation-pi effect

Abstract

The invention provides a preparation method of a super-hydrophilic self-cleaning coating based on a cation-pi effect. The preparation method comprises the following steps: dissolving polyphenol in analkaline buffer solution to obtain a polyphenol alkaline solution, adding a cation source, uniformly mixing and dispersing to obtain a stock solution, adding a substrate into the stock solution, soaking under a stirring condition, and then washing and drying to obtain the super-hydrophilic self-cleaning coating, wherein the cation source is one or a mixture of more than two of sodium salt, potassium salt, micromolecular ammonium salt, magnesium salt or calcium salt. According to the method, the super-hydrophilic coating is rapidly and efficiently prepared under the action of cation-pi, the obtained super-hydrophilic coating shows an excellent separation effect when being applied to oil-water separation, and meanwhile, the paint has self-cleaning performance, antifouling performance, anti-fog performance and acid and alkali resistance.

Description

technical field [0001] The invention relates to a preparation method of a superhydrophilic self-cleaning coating based on cation-π interaction, and belongs to the technical field of superhydrophilic materials. Background technique [0002] Super-hydrophilic materials are widely used in anti-fog, anti-fouling, oil-water separation and other fields; however, most materials do not have super-hydrophilic properties. In order to obtain this property, a layer of super-hydrophilic coating needs to be modified on the surface of the material. Floor. Existing methods for preparing superhydrophilic coatings mainly include: electrospinning, electrochemical polymerization, plasma treatment, template method, coating method, hydrolytic self-assembly method, layer-by-layer self-assembly method, etc. [0003] Chinese patent document CN109847598A discloses a superhydrophilic self-cleaning oil-water separation membrane and its preparation method and application. The oil-water separation memb...

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Problems solved by technology

The obtained modified separation membrane has a super-hydrophilic surface layer and a hydrophobic mass transfer layer at the same time; however, the preparation process of the modified separation membrane obtained in this invention is cumbersome, and the raw materials need to undergo complicated reactions to obtain polymers; and in this invention, the dopamine coating or poly There are chemical bonds, hydrogen bonds, electrostatic interactions, etc. between the phenol-chitosan coating and the cationic polymer. The cationic polymer used has a large molecular radius and a thick hydration layer, so it is difficult to form a cationic-π interaction with polyphenols.

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