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Functionalized graphene/water-borne epoxy resin composite coating with sandwich structure and preparation method thereof

A water-based epoxy resin and composite coating technology, which is applied in epoxy resin coatings, anti-corrosion coatings, coatings, etc., can solve the problems of poor anti-corrosion performance, poor hydrophobicity, and low hardness of the paint film, and achieve novel material structure. Integrity, the effect of improving anti-corrosion performance

Inactive Publication Date: 2021-11-12
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention improves the shortcomings of existing water-based epoxy resin coatings such as poor hydrophobicity, low paint film hardness, and poor anti-corrosion performance, and provides a preparation of a functionalized graphene / water-based epoxy resin composite coating with a sandwich structure The method uses graphene with a complete structure exfoliated in the liquid phase as a substrate, and self-assembles on the surface of graphene through dopamine to obtain polydopamine-wrapped insulating graphene, and then uses the insulating graphene as a new platform to grow nano-manganese tetraoxide. A functionalized graphene with a sandwich structure with graphene as the core layer, insulating polydopamine as the middle layer and nano trimanganese tetraoxide as the outer layer was obtained

Method used

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  • Functionalized graphene/water-borne epoxy resin composite coating with sandwich structure and preparation method thereof
  • Functionalized graphene/water-borne epoxy resin composite coating with sandwich structure and preparation method thereof
  • Functionalized graphene/water-borne epoxy resin composite coating with sandwich structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of step S1 liquid phase exfoliated graphene:

[0039] Add 200 mg of flake graphite and 200 mL of N-methyl-2-pyrrolidone into a 250 mL beaker, and obtain N-methyl-2-pyrrolidone suspension containing flake graphite after ultrasonication for 30 min. The suspension was then placed in a 60 °C water bath and stirred vigorously for 2 h. After cooling to room temperature, it was ultrasonically treated at a low power of 40 W for 24 h, and then the exfoliated graphene dispersion was centrifuged, washed with methanol, and dried in an oven at 50 °C.

[0040] Preparation of insulating graphene wrapped in step S2 polydopamine:

[0041]Take 100 mg of liquid-phase exfoliated graphene and add it to a beaker containing 200 mL of deionized water, then gradually add tris to adjust the pH to 8.5, and perform ultrasonic treatment for 30 minutes to obtain a liquid-phase exfoliated graphene dispersion. Then add 200 mg of dopamine hydrochloride therein, and continue to sonicate fo...

Embodiment 2

[0047] Preparation of step S1 liquid phase exfoliated graphene:

[0048] Add 200 mg of flake graphite and 200 mL of N-methyl-2-pyrrolidone into a 250 mL beaker, and obtain N-methyl-2-pyrrolidone suspension containing flake graphite after ultrasonication for 30 min. The suspension was then placed in a 60 °C water bath and stirred vigorously for 2 h. Then, after it was cooled to room temperature, it was ultrasonically treated at a low power of 40 W for 24 h, and then the exfoliated graphene dispersion was centrifuged, washed with methanol, and dried in an oven at 50 °C.

[0049] Preparation of insulating graphene wrapped in step S2 polydopamine:

[0050] Take 100 mg of liquid-phase exfoliated graphene and add it to a beaker containing 200 mL of deionized water, then gradually add tris to adjust the pH to 8.5, and perform ultrasonic treatment for 30 minutes to obtain a liquid-phase exfoliated graphene dispersion. Then add 200 mg of dopamine hydrochloride therein, and continue t...

Embodiment 3

[0056] Preparation of step S1 liquid phase exfoliated graphene:

[0057] Add 200 mg of flake graphite and 200 mL of N-methyl-2-pyrrolidone into a 250 mL beaker, and obtain N-methyl-2-pyrrolidone suspension containing flake graphite after ultrasonication for 30 min. The suspension was then placed in a 60 °C water bath and stirred vigorously for 2 h. Then, after it was cooled to room temperature, it was ultrasonically treated at a low power of 40 W for 24 h, and then the exfoliated graphene dispersion was centrifuged, washed with methanol, and dried in an oven at 50 °C.

[0058] Preparation of insulating graphene wrapped in step S2 polydopamine:

[0059] Take 100 mg of liquid-phase exfoliated graphene and add it to a beaker containing 200 mL of deionized water, then gradually add tris to adjust the pH to 8.5, and perform ultrasonic treatment for 30 minutes to obtain a liquid-phase exfoliated graphene dispersion. Then add 200 mg of dopamine hydrochloride therein, and continue t...

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Abstract

The invention discloses a functionalized graphene / water-borne epoxy resin composite coating with a sandwich structure and a preparation method thereof. The preparation method comprises the following steps of: taking graphene which is peeled off from a liquid phase and has a complete structure as a matrix, self-assembling dopamine on the surface of the graphene to obtain polydopamine-coated insulating graphene, and growing nano manganous-manganic oxide by taking the insulating graphene as a new platform to obtain functionalized graphene which is of a sandwich structure and takes graphene as a core layer, insulating polydopamine as a middle layer and nano manganous-manganic oxide as an outer layer. The functionalized graphene is doped into a water-borne epoxy resin coating, and due to insulation wrapping of polydopamine, the corrosion promoting activity of the graphene is effectively inhibited. Moreover, the functionalized graphene is uniformly and stably dispersed in the water-borne epoxy resin under the crosslinking action of the polydopamine and the water-borne epoxy resin, and the corrosion resistance of the water-borne epoxy resin coating is remarkably enhanced through the synergistic effect of the excellent barrier action of the functionalized graphene and the corrosion inhibition action of the nano manganous-manganic oxide.

Description

technical field [0001] The invention belongs to the technical field of water-based coatings, and in particular relates to a functionalized graphene / water-based epoxy resin composite coating with a sandwich structure, the anti-corrosion performance of which is significantly improved. Background technique [0002] Since solvent-based coatings will volatilize a large amount of organic solvents during the drying and curing process, this will cause great pollution and harm to the environment and human body. In order to reduce the VOC of coatings, water-based coatings have been widely promoted. Although water-based coatings are widely used in various industries because of their environmental protection, low pollution, convenient construction, and low price, they have quickly replaced most solvent-based coatings. However, the inherent shortcomings such as poor hydrophobicity, low hardness of the paint film, and a large number of shrinkage cavities left during the drying process al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/08C09D7/62
CPCC09D163/00C09D5/08C09D7/62C08K2003/2262C08K2201/011C08K9/10C08K3/042C08K3/22
Inventor 郑玉婴张杰
Owner FUZHOU UNIV
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