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Graphene-containing metal surface treatment agent and preparation method of anti-corrosion coating

A technology of metal surface treatment and graphene, applied in the direction of surface coating liquid devices, coatings, anti-corrosion coatings, etc., can solve the problems of poor corrosion resistance, corrosion under the film, etc., and achieve longer penetration time and better binding force Effect

Inactive Publication Date: 2015-05-20
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the corrosion resistance of organic coatings is usually inferior to that of hexavalent chromium passivation films. The main reason is that the penetration of small molecules such as water and oxygen in organic coatings leads to the occurrence of under-film corrosion.

Method used

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  • Graphene-containing metal surface treatment agent and preparation method of anti-corrosion coating
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  • Graphene-containing metal surface treatment agent and preparation method of anti-corrosion coating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Firstly, dilute the silane coupling agent with a mass fraction of 5% of the solute plus deionized water to form an aqueous dispersion of the silane coupling agent with a concentration not exceeding 20%.

[0028] Then, the aqueous dispersion of the silane coupling agent is added into the water-based resin for uniform mixing to form a mixed solution. The water-based resin is water-based polyurethane and water-based acrylic resin, wherein the polyurethane in the water-based polyurethane accounts for 64.95% of the solute mass fraction, and the acrylic resin in the water-based acrylic resin accounts for 30% of the solute mass fraction.

[0029] The expanded graphite is oxidized to graphite oxide by improving the Hummers method, the graphite oxide is added to deionized water, and the graphene oxide water dispersion is obtained by exfoliating by methods such as magnetic stirring, mechanical vibration or ultrasonic waves.

[0030] 0.05% of the solute mass fraction of graphene o...

Embodiment 2

[0032] Firstly, dilute the silane coupling agent with a mass fraction of 20% of the solute plus deionized water to form an aqueous dispersion of the silane coupling agent with a concentration not exceeding 20%.

[0033] Then, the aqueous dispersion of the silane coupling agent is added into the water-based resin for uniform mixing to form a mixed solution. The water-based resin is water-based polyurethane and water-based acrylic resin, wherein the polyurethane in the water-based polyurethane accounts for 60% of the solute mass fraction, and the acrylic resin in the water-based acrylic resin accounts for 15% of the solute mass fraction.

[0034] The expanded graphite is oxidized to graphite oxide by improving the Hummers method, the graphite oxide is added to deionized water, and the graphene oxide water dispersion is obtained by exfoliating by methods such as magnetic stirring, mechanical vibration or ultrasonic waves.

[0035] 5% graphene oxide aqueous dispersion is added to ...

Embodiment 3

[0037] First, dilute the silane coupling agent with a mass fraction of 39.95% of the solute plus deionized water to form an aqueous dispersion of the silane coupling agent with a concentration not exceeding 20%.

[0038] Then, the aqueous dispersion of the silane coupling agent is added into the water-based resin for uniform mixing to form a mixed solution. The water-based resin is water-based polyurethane and water-based acrylic resin, wherein the polyurethane in the water-based polyurethane accounts for 49.85% of the total solid component mass fraction, and the acrylic resin in the water-based acrylic resin accounts for 10% of the total solid component mass fraction.

[0039] The expanded graphite is oxidized to graphite oxide by improving the Hummers method, the graphite oxide is added to deionized water, and the graphene oxide water dispersion is obtained by exfoliating by methods such as magnetic stirring, mechanical vibration or ultrasonic waves.

[0040] 0.2% of the sol...

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Abstract

The invention relates to a graphene-containing metal surface treatment agent and a preparation method of an anti-corrosion coating thereof. Graphene oxide is prepared by a chemical oxidation method, and the graphene oxide is subjected to surface modification and reduction so as to obtain good compatibility with a metal surface treatment agent; and the graphene is added into the metal surface treatment agent according to a certain proportion. The treatment agent contains A) waterborne resin, for example, waterborne polyurethane and waterborne acrylic resin; B) a coupling agent, for example, a silane coupling agent and a titanate coupling agent; and C) graphene, wherein the surface state can be graphene oxide, reduced graphene oxide or graphene subjected to surface chemical modification. After the surface treatment agent containing uniformly dispersed graphene, a film is formed on the surface of a metal substrate by a rod coating method, and the film is dried at a certain temperature to obtain a graphene-reinforced composite coating. An electrochemical impedance test method proves that the composite coating has ultrahigh corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a graphene-containing organometallic surface treatment agent and its coating on the metal surface. Background technique [0002] As the highly toxic hexavalent chromium passivation film is gradually banned, organic coatings have become the most commonly used surface corrosion protection method for metal substrates in production practice. However, the corrosion resistance of organic coatings is usually inferior to hexavalent chromium passivation films, mainly due to the penetration of small molecules such as water and oxygen in organic coatings, resulting in the occurrence of corrosion under the film. Graphene is a Sp 2 Hybrid single-atom graphite flakes have a series of unique properties, such as good electrical conductivity, thermal conductivity, excellent mechanical properties, and high specific surface area and light transmission. In addition, graphene ...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D133/00C09D7/12C09D5/08B05D7/16
CPCB05D7/16C08K2201/014C09D5/08C09D7/62C09D7/63C09D175/04C08L33/00C08K9/00C08K5/54C08K7/24C08K13/06C08K9/06C08K9/04
Inventor 李静李雅雅杨真真崔锦灿杨俊和邱汉迅杨光智
Owner UNIV OF SHANGHAI FOR SCI & TECH
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