A preparation method of superhydrophilic self-cleaning coating based on cation-π interaction

A self-cleaning coating, cationic technology, applied in the field of super-hydrophilic materials, can solve the problems of large molecular radius of cationic polymers, cumbersome preparation process of modified separation membrane, thick hydration layer, etc. Cleaning performance, easy operation effect

Active Publication Date: 2022-04-01
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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  • A preparation method of superhydrophilic self-cleaning coating based on cation-π interaction
  • A preparation method of superhydrophilic self-cleaning coating based on cation-π interaction
  • A preparation method of superhydrophilic self-cleaning coating based on cation-π interaction

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Effect test

Embodiment 1

[0037] A preparation method of a superhydrophilic self-cleaning coating based on cation-π action, comprising the steps of:

[0038] Dissolve 2g tannic acid (TA) in 40mL aqueous sodium hydroxide solution (pH is 8), polyphenol alkaline solution; then add 5g NaCl to the polyphenol alkaline solution, mix and dissolve to obtain a stock solution; Then, the base copper mesh (200 mesh) was immersed in the stock solution, soaked for 48 hours under stirring conditions, and then washed with distilled water and dried to prepare a coated modified copper mesh, that is, a TA-Na modified copper mesh.

Embodiment 2

[0040] A preparation method of a superhydrophilic self-cleaning coating based on cation-π action, comprising the steps of:

[0041] Dissolve 1g tannic acid (TA) in 40mL aqueous sodium hydroxide solution (pH is 8), polyphenol alkaline solution; then add 5g tetramethylammonium chloride to the polyphenol alkaline solution, mix and dissolve The stock solution was obtained; then the base copper mesh (200 mesh) was immersed in the stock solution, soaked for 24 hours under stirring conditions, and then washed with distilled water and dried to prepare a coated modified copper mesh, that is, a TA-TMA modified copper mesh.

Embodiment 3

[0043] A preparation method of a superhydrophilic self-cleaning coating based on cation-π effect, as described in Example 2, the difference is: replace the substrate with glasses, and only coat one side of the glasses, and the other steps Under the same conditions as in Example 2, TA-TMA modified glasses were prepared.

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Abstract

The invention provides a method for preparing a superhydrophilic self-cleaning coating based on the cation-π effect, comprising the steps of: dissolving polyphenols in an alkaline buffer solution to obtain a polyphenol alkaline solution; adding a cation source, mixing and dispersing evenly to obtain stock solution; add the substrate to the stock solution, soak it under agitation, then wash and dry to obtain a superhydrophilic self-cleaning coating; the cation source is sodium salt, potassium salt, small molecule ammonium salt, magnesium salt or calcium One or a mixture of two or more salts. The invention utilizes the cation-π effect to prepare a super-hydrophilic coating quickly and efficiently; the obtained super-hydrophilic coating exhibits excellent separation effect when applied to oil-water separation; and has self-cleaning performance, anti-fouling performance, and anti-fog at the same time 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 effect, 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. Floor. Existing methods for preparing superhydrophilic coatings mainly include: electrospinning, electrochemical polymerization, plasma treatment, template method, coating method, hydrolysis self-assembly method, layer-by-layer self-assembly method, and the like. [0003] Chinese patent document CN109847598A discloses a super-hydrophilic self-cleaning oil-water separation membrane and its preparation method and application. The oil-water separation membrane is a modified membrane in which the surface of the base membrane is covered with a super-hydrophilic coating; the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D171/10C09D7/20C09D5/16C08G65/38B05D7/16
CPCC09D171/00C09D7/20C09D5/1662C08G65/38B05D7/16B05D2202/45
Inventor 张培育崔基炜郝京诚
Owner SHANDONG UNIV
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