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Metal surface anticorrosive coating comprising graphene and preparing method thereof

A metal surface, graphene technology, applied in anti-corrosion coatings, coatings, polyurea/polyurethane coatings, etc., can solve the problems of cumbersome chemical synthesis steps, unsatisfactory self-healing performance, etc., to simplify process steps and enhance self-repair. Restorative effect, easy-to-prepare effect

Active Publication Date: 2015-09-30
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis of such microcapsules not only involves cumbersome chemical synthesis steps, but also has unsatisfactory self-healing properties.

Method used

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  • Metal surface anticorrosive coating comprising graphene and preparing method thereof
  • Metal surface anticorrosive coating comprising graphene and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Graphene oxide was prepared by improving Hummer's method, and configured into a graphene oxide aqueous solution with a standard concentration of 2 mg / ml. Graphene (the volume of the above-mentioned graphene oxide aqueous solution multiplied by its standard concentration value, the same below) is mixed with linseed oil at a mass ratio of 0.2%, and deionized water is added to make the water-oil ratio (the ratio of water to linseed oil) mass ratio) is controlled at 2:1. The resulting mixture was dispersed under high shear for 10 minutes, and the rotational speed of the high shear emulsifier was about 600 rpm. Then the mixed solution is mixed with the water-based polyurethane resin, so that the mass ratio of the polyurethane solid content (wherein the actual polyurethane is contained) to the restorative agent linseed oil is 5:1. Adjust the solid content of the paint to 20%, and form a film on the surface of the galvanized steel sheet by a rod coating method. Dry at 110°C ...

Embodiment 2

[0036] Graphene oxide was prepared by improving Hummer's method, and configured as a graphene oxide aqueous solution with a concentration of 2 mg / ml. Graphene and linseed oil are mixed in a mass ratio of 2%, and deionized water is added to control the water-oil ratio at 2:1. Then add a small amount (no more than 0.3 times of graphene mass) of hydrazine hydrate to partially reduce graphene oxide. The mixture was dispersed under high shear for 10 minutes at a speed of about 600 rpm. Then the mixed solution is mixed with water-based polyurethane resin, wherein the mass ratio of polyurethane solid content to repair agent is 20:1. Adjust the solid content of the paint to 20%, and form a film on the surface of the galvanized steel sheet by a rod coating method. Dry at 110°C for 30 minutes.

Embodiment 3

[0038] Graphene oxide was prepared by improving Hummer's method, and configured as a graphene oxide aqueous solution with a concentration of 2 mg / ml. Graphene is mixed with linseed oil by mass ratio of 10%, and deionized water is added to control the water-oil ratio at 20:1. The mixture was dispersed under high shear for 10 minutes at a speed of about 600 rpm. Then the mixed solution is mixed with water-based polyurethane resin, wherein the mass ratio of polyurethane solid content to repair agent is 50:1. Adjust the solid content of the paint to 20%, and form a film on the surface of the galvanized steel sheet by a rod coating method. Dry at 110°C for 30 minutes.

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Abstract

The invention discloses a metal surface anticorrosive coating comprising graphene and a preparing method thereof. The coating is formed by dried self-repairing microcapsules evenly dispersed in a film formation matrix. The self-repairing microcapsules are formed by wrapping organic repairing agents with the graphene, and the film formation matrix includes waterborne organic resin. According to the metal surface anticorrosive coating comprising graphene and the preparing method thereof, all the components of a coating system are in synergism to commonly form the self-repairing coating which is good in performance.

Description

technical field [0001] The present invention generally relates to metal anticorrosion coatings and methods for their preparation. Background technique [0002] Organic coating is the most commonly used corrosion protection method for metal surfaces in production practice. Once the organic coating is scratched or cracked during use, its protective effect will fail. Self-healing function is one of the important development directions of intelligent coating function. There are generally two ways for the self-repair of the coating: one is the self-repair of the coating material itself, that is, the molecular chain of the film-forming substrate of the coating can be re-bonded through hydrogen bonding, π bonding, low-temperature remelting, and reversible after being broken. The second is to add evenly distributed self-healing microcapsules in the coating material, which can break and release the repairing agent when scratches or cracks occur to repair the damage. [0003] Prior...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D191/00C09D5/08
Inventor 李静冯庆康袁茜茜崔锦灿杨俊和邱汉迅
Owner UNIV OF SHANGHAI FOR SCI & TECH
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