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Bionic sandwich anticorrosive coating, preparation method and application thereof

An anti-corrosion coating and sandwich technology is applied in the field of bionic sandwich anti-corrosion coating and its preparation to achieve the effects of improving interface compatibility and adhesion, wide application prospects and low cost

Active Publication Date: 2020-12-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, corrosive media (H 2 O, O 2 and Cl - etc.) have some permeability to organic coatings

Method used

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  • Bionic sandwich anticorrosive coating, preparation method and application thereof
  • Bionic sandwich anticorrosive coating, preparation method and application thereof
  • Bionic sandwich anticorrosive coating, preparation method and application thereof

Examples

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preparation example Construction

[0034] In view of the deficiencies in the prior art, the inventor of this case was able to propose the technical solution of the present invention after long-term research and extensive practice, aiming to provide a bionic sandwich anti-corrosion coating inspired by natural nacre and mussels and its preparation method, It mainly includes steps such as graphene modification, electrolyte configuration, substrate pretreatment, and composite coating preparation. The technical solution, its implementation process and principle will be further explained as follows.

[0035] An aspect of the embodiments of the present invention provides a biomimetic sandwich anti-corrosion coating inspired by natural nacre and mussels, including at least two water-based resin layers covering the surface of the substrate, wherein two adjacent water-based resin layers are distributed There is at least one graphene barrier layer comprising a dopamine-functionalized graphene material having a sheet struc...

Embodiment 1

[0097] A preparation method of a bionic sandwich waterborne epoxy anticorrosion coating, comprising the steps of:

[0098] 1. Graphene modification: Add dopamine and graphene oxide with a mass ratio of 1:1 to a phosphate buffer solution with a pH value of 6.7 and mix evenly. The mixing temperature is 25°C and the mixing time is 10h.

[0099] 2. Steel sheet pretreatment: the size is 3×3cm 2 The steel sheet was polished on 600 and 1200 mesh sandpaper, cleaned ultrasonically with ethanol for 20 minutes, and finally dried with nitrogen.

[0100] 3. Composite coating preparation: the steel sheet is used as the cathode, and the copper sheet of the same size is used as the anode, immersed in 100g of water-based epoxy emulsion with a solid content of 25%; the water-based resin is deposited on the surface of the substrate by controlling the deposition voltage and deposition time; then Deposit different layers of graphene / dopamine materials on the surface of the above coating by cyclic...

Embodiment 2

[0104] A preparation method of a bionic sandwich water-based acrylic anticorrosion coating, comprising the steps of:

[0105] 1. Graphene modification: Add dopamine and graphene oxide with a mass ratio of 1:100 to a phosphate buffer solution with a pH value of 8 and mix evenly. The mixing temperature is 10°C and the mixing time is 24h.

[0106] 2. Steel sheet pretreatment: the size is 1×1cm 2 The steel sheet was polished on 100 and 1000 mesh sandpaper, cleaned ultrasonically with ethanol for 5 minutes, and finally dried with nitrogen.

[0107] 3. Composite coating preparation: the steel sheet is used as the cathode, and the copper sheet of the same size is used as the anode, immersed in 100g of water-based acrylic emulsion with a solid content of 5%; the water-based resin is deposited on the surface of the substrate by controlling the deposition voltage and deposition time; and then by Cyclic voltammetry deposits different layers of graphene / dopamine materials on the surface ...

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Abstract

The invention discloses a bionic sandwich anticorrosive coating, a preparation method and application thereof. The bionic sandwich anticorrosive coating comprises at least two water-based resin layerscovering the surface of a substrate, wherein at least one graphene barrier layer is distributed between every two adjacent water-based resin layers, each graphene barrier layer comprises a dopamine functionalized graphene material with a lamellar structure, and the dopamine functionalized graphene material is arranged in a manner of being parallel to the surface of the substrate. The preparationmethod comprises the step of sequentially depositing a water-based resin layer, a graphene barrier layer and a water-based resin layer on the surface of a substrate by adopting an electrophoretic deposition technology and a cyclic voltammetry. According to the invention, due to the interaction of hydrogen bonds and static electricity, a graphene material is arranged between two water-based resin layers in parallel, so that the diffusion path of a corrosive medium can be effectively prolonged, and the barrier effect of graphene can be brought into full play and approximates to the barrier limit; and the preparation method disclosed by the invention is simple and convenient, low in cost and small in pollution.

Description

technical field [0001] The invention relates to an anti-corrosion coating, in particular to a bionic sandwich anti-corrosion coating inspired by natural nacre and mussels and its preparation method and application, belonging to the technical field of anti-corrosion coatings. Background technique [0002] With the rapid development of the marine industry and its strong demand for marine resources, various marine facilities, ships and metal components must face severe corrosion problems in the development of marine resources. Studies have shown that in addition to reasonable material selection, organic protective coatings are one of the most widely used and cost-effective anti-corrosion measures. Among them, water-based cathodic electrophoretic emulsion is a coating with water as the solvent. It is not only green and environmentally friendly (meeting the requirements of low volatile organic compound emissions), but also has ideal adhesion, and is widely used in mainstream auto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D1/00C09D5/08C09D133/04C09D161/20C09D175/04C25D13/06
CPCC09D5/08C09D5/4457C09D5/4411C09D5/448C09D5/4465C09D5/4469C25D15/00
Inventor 赵海超朱小波刘栓卢光明王立平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI