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A preparation method of graphene-based self-healing superhydrophobic coating

A super-hydrophobic coating and self-healing technology, applied in coatings, pigmented coatings, antifouling/underwater coatings, etc., to achieve mild conditions, cost savings, and easy operation

Active Publication Date: 2020-07-21
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing a graphene-based self-healing superhydrophobic coating for the defects of the existing superhydrophobic coating

Method used

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  • A preparation method of graphene-based self-healing superhydrophobic coating
  • A preparation method of graphene-based self-healing superhydrophobic coating
  • A preparation method of graphene-based self-healing superhydrophobic coating

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Experimental program
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Effect test

Embodiment 1

[0026] 1) Preparation of self-healing superhydrophobic coating:

[0027] Mix 1 g of graphene oxide and 150 mL of absolute ethanol evenly, then ultrasonically disperse for 10 min, then add 5 g of octadecylamine to continue ultrasonic treatment for 1 h, put the ultrasonically treated dispersion in a three-necked flask, and reflux at 80 °C for reaction 24 h; cooled to room temperature, centrifuged and washed 6 times with absolute ethanol to remove unreacted octadecylamine, and dried completely in a vacuum oven at 60 °C to obtain a self-healing superhydrophobic material; the self-healing superhydrophobic material and 200 mL of a dispersion with a concentration of 0.5 mg / mL was prepared in absolute ethanol and dispersed ultrasonically for 10 min; the dispersion was suction-filtered on filter paper and dried to obtain a self-healing superhydrophobic coating.

[0028] 2) Determination of coating self-healing performance:

[0029] Use YZD08-5C plasma cleaning machine (manufactured by...

Embodiment 2

[0031] 1) Preparation of self-healing superhydrophobic coating:

[0032] Mix 1 g of graphene oxide and 350 mL of absolute ethanol evenly, and then ultrasonically disperse for 20 min, then add 10 g of octadecylamine to continue ultrasonic treatment for 1.5 h, put the ultrasonically treated dispersion in a three-necked flask, and reflux at 160 °C for reaction 6 h; cooled to room temperature, centrifuged and washed 6 times with absolute ethanol to remove unreacted octadecylamine, and dried completely in a vacuum oven at 120 °C to obtain a self-healing superhydrophobic material; the self-healing superhydrophobic material and 200 mL of a dispersion with a concentration of 1 mg / mL was prepared in acetone and dispersed ultrasonically for 30 min; the dispersion was sprayed on glass and dried to obtain a self-healing superhydrophobic coating.

[0033] 2) Determination of coating corrosion resistance:

[0034] Use HCl, NaOH and NaCl to prepare 1 mol / L acid, alkali and salt solutions re...

Embodiment 3

[0036] 1) Preparation of self-healing superhydrophobic coating:

[0037] 1 g of graphite oxide and 500 mL of absolute ethanol were ultrasonically stripped for 30 min to obtain graphene oxide, then 15 g of octadecylamine was added to continue ultrasonic treatment for 2 h, and centrifuged with absolute ethanol for 6 times to remove unreacted octadecylamine , in a vacuum oven at 180 ℃ until completely dry to obtain a self-healing superhydrophobic material; prepare 200 mL of a dispersion with a concentration of 1.5 mg / mL and ultrasonically disperse the self-healing superhydrophobic material and N,N-dimethylformamide for 60 min; the sponge was repeatedly dipped in the dispersion and dried to obtain a self-healing superhydrophobic coating.

[0038] 2) Determination of coating UV resistance:

[0039] The coating was irradiated with ultraviolet light by an ultraviolet cross-linking instrument (manufactured by UVP Company of the United States), and the coating was taken out after 5000...

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Abstract

The invention discloses a preparation method of a graphene-based self-repairing super-hydrophobic coating. According to the method, octadecylamine-modified graphene oxide is adopted for obtaining a super-hydrophobic material with a self-repairing function, and the material is processed by means of spraying, brushing, extraction filtration, dipping and other methods to form a coating on the surfaceof a base material; after the coating is dried, a graphene-based self-repairing super-hydrophobic material is obtained. When the coating is influenced by ultraviolet rays, the acid-base degree and ion etching in an application environment and loses super hydrophobicity, the surface structure of the coating is recombined automatically and healed to an initial state, the super hydrophobicity of thecoating recovers, and therefore self-repairing of the super-hydrophobic coating is achieved. According to the preparation method of the self-repairing super-hydrophobic coating, a preparation processis easy to implement, the reaction conditions are mild, and the cost is low. The coating has the advantages of being capable of carrying out cleaning and repairing automatically and resistant to bonding, corrosion and ultraviolet rays, the super hydrophobicity and self-repairing super hydrophobicity of the coating are not limited by the base material, and a new approach is provided for prolongingthe service life of the super-hydrophobic coating.

Description

technical field [0001] The invention relates to a self-repairing super-hydrophobic coating, in particular to a graphene-based self-repairing super-hydrophobic material and a preparation method of the coating. Background technique [0002] Superhydrophobic surfaces are a common phenomenon in nature, such as water droplets rolling down rapidly on the surfaces of plants such as lotus leaves and rice leaves. The superhydrophobic phenomenon refers to the state where the static contact angle of water droplets on the solid surface is more than 150°, and the rolling angle is less than 10°. It has practical application value in antifouling and anticorrosion in automobile, pipeline transportation, metal and other industries, and has broad application prospects in many fields of production and life. Graphene itself has a good water-repellent effect, and its oxygen-containing derivative graphene oxide is conducive to modification, which can improve compatibility with other substrates, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/00C09D5/16C09D5/08D21H19/38C08J9/40
CPCC08J9/40C09D1/00C09D5/08C09D5/1618C09D5/1656D21H19/38
Inventor 罗晓民胡文杰魏梦媛冯见艳霍倩倩
Owner SHAANXI UNIV OF SCI & TECH
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