Wear-resistant corrosion-resistant super-hydrophobic composite coating and preparation method thereof

A composite coating, super-hydrophobic technology, used in coatings, anti-corrosion coatings, epoxy resin coatings, etc., can solve the problems of coating corrosion resistance evaluation, poor mechanical stability, toxicity and other problems, and achieve easy mass production and application, Excellent superhydrophobicity and simple method

Inactive Publication Date: 2021-11-26
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] "Superhydrophobic" refers to the wettability phenomenon in which the contact angle of water droplets on a solid surface is greater than 150° and the rolling angle is less than 10°. Due to its wide application prospects, superhydrophobic coatings have attracted great attention in recent years, but superhydrophobic coatings Hydrophobic coatings generally have the problems of poor mechanical stability, complicated preparation process and poor corrosion resistance.
[0003] CN111117384A has announced a kind of preparation method of superhydrophobic coating material of high mechanical strength wear resistance and corrosion resistance, although the coating that makes has wear resistance and corrosion resistance concurrently, operation is more loaded down with trivial details, and introduces fluorine when preparing coating The element and solvent are acetone, which is toxic and not environmentally friendly
CN111171648A has announced a kind of preparation method of wear-resistant superhydrophobic coating, and this method is to spray on substrate after superhydrophobic silicon dioxide, acrylate copolymer, alcoholic solvent are mixed uniformly, and process is simple and easy to control, coating base Good material adaptability, friction resistance, strong adhesion, long service life, and environmental friendliness, but did not evaluate the corrosion resistance of the coating

Method used

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  • Wear-resistant corrosion-resistant super-hydrophobic composite coating and preparation method thereof
  • Wear-resistant corrosion-resistant super-hydrophobic composite coating and preparation method thereof
  • Wear-resistant corrosion-resistant super-hydrophobic composite coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Put 12.4ml of tetraethyl orthosilicate and 97.2ml of absolute ethanol in a three-neck flask and reflux and stir at 60°C for 10 minutes, then take 1ml of water and 11.8ml of ammonia water and mix evenly, and mix the mixture for 1 second Add dropwise to the three-necked flask at a speed of one drop. After the dropwise addition, reflux and stir at 60°C for 10 minutes, then take 9.5 ml of methyltriethoxysilane and add it dropwise to the three-necked flask, and then reflux and stir at 60°C for 2 hours. After the stirring was completed, the solution was sealed and left to stand at room temperature for 24 hours, and then the obtained solution was placed in an oven at 60° C. for 2 days to obtain a hydrophobically modified nano-silica powder.

[0024] (2) Put 2g of mica powder, 0.5g of methyltrimethoxysilane and 0.1g of ammonia water in a closed container, and put them in an oven at 70°C for vapor deposition to obtain hydrophobically modified mica powder.

[0025] (3) Disper...

Embodiment 2

[0029] Example 2 (without using KH-560 functional modifier)

[0030] (1) The preparation method of hydrophobically modified nano-silica powder and mica powder is the same as in Example 1.

[0031] (2) Add 0.15g of hydrophobic silica and 0.05g of hydrophobic mica powder to a mixed solution of 0.25g of epoxy resin E-51 and 1ml of ethyl acetate, ultrasonicate for 10min and stir at 25°C for 1h to obtain epoxy resin / Mica-silica sol.

[0032] (3) Add 0.125g of curing agent T31 to the epoxy resin / mica-silica sol in step (2), stir for 10 minutes, spray on the glass substrate, and cure at 80°C for 2 hours to obtain a wear-resistant and corrosion-resistant super Hydrophobic coating.

[0033]The average water contact angle of the coating prepared in this embodiment is 155°, and the rolling angle is 3.8°. The abrasion resistance distance of the coating measured by sandpaper abrasion test was 1400cm, and the surface remained hydrophobic after soaking in 3.5wt% NaCl solution for 15 days...

Embodiment 3

[0035] (1) The preparation method of the hydrophobically modified nano silica powder is the same as that in Example 1.

[0036] (2) Mix 0.25g of epoxy resin E-51 and 1ml of ethyl acetate evenly, add 0.20g of hydrophobic silica powder, ultrasonicate for 10min and stir at 25°C for 1h to obtain epoxy resin / silica sol.

[0037] (3) Add 0.125g of curing agent T31 to the epoxy resin / silica sol in step (2) and stir for 10min, then spray on the glass substrate, and cure at 80°C for 2h to obtain a superhydrophobic coating.

[0038] The average water contact angle of the coating prepared in this embodiment is 152.29°, and the rolling angle is 3.5°. The wear resistance distance of the coating was measured by sandpaper abrasion test to be 300cm, and the surface was soaked and lost superhydrophobicity after soaking in 3.5wt% NaCl solution for 5 days.

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Abstract

The invention discloses a wear-resistant and corrosion-resistant super-hydrophobic composite coating and a preparation method thereof. The method comprises the following steps: uniformly mixing silane coupling agent KH-560 functional modified mica-silicon dioxide composite powder with epoxy resin and ethyl acetate to obtain epoxy resin / mica-silicon dioxide sol; and then spraying the sol on a base material, and curing the sol at 80 DEG C for 2 hours to obtain the wear-resistant and corrosion-resistant super-hydrophobic composite coating. The water contact angle of the surface of the coating is 155-160 degrees, the rolling angle of the surface of the coating is 2-4 degrees, the contact angle of the surface of the coating is 148.3 degrees after the surface of the coating is rubbed on 320-mesh SiC abrasive paper for 2000 cm along a straight line under the pressure intensity of 2000 Pa, and the surface of the coating is still kept hydrophobic after the coating is soaked in a 3.5 wt% NaCl solution for 30 days, the contact angle reaching 146.0 degrees. The preparation method is simple, environmentally friendly, low in cost and suitable for the surfaces of different base materials such as glass, metal, wood, ceramic and stone, and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of superhydrophobic materials, and in particular relates to a wear-resistant and corrosion-resistant superhydrophobic composite coating and a preparation method thereof. Background technique [0002] "Superhydrophobic" refers to the wettability phenomenon in which the contact angle of water droplets on a solid surface is greater than 150° and the rolling angle is less than 10°. Due to its wide application prospects, superhydrophobic coatings have attracted great attention in recent years, but superhydrophobic coatings Hydrophobic coatings generally have the problems of poor mechanical stability, complicated preparation process and poor corrosion resistance. [0003] CN111117384A has announced a kind of preparation method of superhydrophobic coating material of high mechanical strength wear resistance and corrosion resistance, although the coating that makes has wear resistance and corrosion resistance concur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/02C09D5/08C09D7/62
CPCC09D163/00C09D5/08C09D7/62C08K9/06C08K3/36C08K3/34
Inventor 李湘祁张光敏逯丙尧
Owner FUZHOU UNIV
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