Graphene-containing Cr-free dacromet water-based paint as well as preparation method and use method thereof

A water-based coating and graphene technology, applied in anti-corrosion coatings, coatings, etc., can solve the problems of high curing temperature, carcinogenicity, and strong toxicity of dacromet coatings

Inactive Publication Date: 2017-11-07
THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Dacromet coating contains chromium ions that are harmful to the environment and people, especially the hexavalent chromium ions are extremely toxic and carcinogenic, and its use is restricted by countries all over the world;
[0005] (2) The curing temperature of Dacromet coating is high, the hardness is low, the scratch resistance is poor, and the friction coefficient is high, which leads to the short life of Dacromet coating
It has been reported that inorganic salts or organic polymers can be used as a substitute for chromic anhydride, but the corrosion resistance is not as good as that of chromium-containing dacromet.

Method used

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  • Graphene-containing Cr-free dacromet water-based paint as well as preparation method and use method thereof

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preparation example Construction

[0051] In the preparation method of the above-mentioned graphene chrome-free dacromet water-based paint, the graphene water-based slurry is added to the A component, and then mixed with the B component and the C component evenly, and then the pH is adjusted to 5.5-6.5.

[0052] The above-mentioned method of using the graphene chrome-free dacromet water-based paint, the paint is applied on the substrate, first pre-baked at 120°C for 15-20min, and then baked and solidified at 280°C for 15-35min in a sintering furnace; preferably, Coating thickness is 6um.

[0053] In the present invention, graphene water-based slurry is added to the chrome-free dacromet coating, and the graphene water-based slurry used can grind graphene powder, dispersant, and water to grind the material finely (D99<3.5um), fully Mix well. The stable period can reach more than three months (graphene does not settle). The graphene water-based slurry and chrome-free dacromet can achieve self-fusion, and can eve...

Embodiment 1

[0056] 1) 5 parts of dispersants, 10 parts of graphene (the sheet diameter of graphene powder is 3um, thickness is 3nm, specific surface area is 225m 2 / g), 100 parts of water were processed by a high-speed disperser at 1000 rpm for 30 minutes to obtain a uniform suspension.

[0057] 2) Grinding the premix solution on a sand mill for 3h (sand mill speed 3000rpm) to obtain a uniformly dispersed graphene slurry.

[0058] 3) Add the graphene slurry to the A component of the chrome-free coating (Zn: Al: deionized water: dispersant = 25:4:25:30), and B (phosphoric acid: PH regulator: cerium ammonium nitrate = 3 :4:3), C (thickener, film-forming aid, film-forming agent = 3:0.5:8) components are stirred evenly and the pH is adjusted to 6.5. Graphene solid content accounts for 0.5%. Then apply the mixed solution on the steel sheet and bake, now pre-baking at 120°C for 20min. Test after baking and curing for 35 minutes at 280°C in a sintering furnace. The salt spray resistance time...

Embodiment 2

[0060] 1) 3 parts of dispersants, 10 parts of graphene (the sheet diameter of graphene powder is 3um, thickness is 3nm, specific surface area is 225m 2 / g), 100 parts of water were processed by a high-speed disperser at 1000 rpm for 30 minutes to obtain a uniform suspension.

[0061] 2) Grinding the premixed solution on a sand mill for 1 h (sand mill speed 3000 rpm) to obtain a uniformly dispersed graphene slurry.

[0062] 3) Add the graphene slurry to the A component of the chrome-free coating (Zn: Al: deionized water: dispersant = 25:4:25:30), and B (phosphoric acid: PH regulator: cerium ammonium nitrate = 3 :4:3), C (thickener, film-forming aid, film-forming agent = 3:0.5:8) components are stirred evenly and the pH is adjusted to 6.5. Graphene solid content accounts for 0.7%. Then apply the mixed solution on the steel sheet and bake, now pre-baking at 120°C for 20min. Test after baking and curing for 35 minutes at 280°C in a sintering furnace. The salt spray resistance ...

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Abstract

The invention discloses graphene-containing Cr-free dacromet water-based paint as well as a preparation method and a use method thereof. The graphene-containing Cr-free dacromet water-based paint is prepared from a component A, a component B, a component C and graphene aqueous slurry, wherein the component A contains Zn, Al, water and a dispersant; the component B contains phosphoric acid, a PH regulator and cerium ammonium nitrate; the component C contains a thickener, a film-forming aid and a film-forming agent, and graphene accounts for 0.5%-1% of the total mass of the paint. The graphene-containing Cr-free dacromet has the advantages that corrosion resistance is greatly improved, the coating thickness is reduced from 20 mu m to 6 mu m, and salt-fog resistance time is prolonged from 80 hours to 120 hours.

Description

technical field [0001] The invention relates to a modified chrome-free dacromet coating and a preparation method thereof, in particular to a chrome-free coating added with graphene and a preparation method thereof, belonging to the technical field of metal anticorrosion. Background technique [0002] Corrosion causes great loss every year all over the world, so it is urgent and necessary to improve the corrosion resistance of coatings. Due to the advantages of strong adhesion, high strength, strong cohesiveness, and good corrosion resistance, epoxy resin is often made into coatings and widely used in various fields that require anti-corrosion. However, the shortcomings of pure epoxy resin coatings such as poor toughness, high water absorption, and low wear resistance shorten its anti-corrosion life and limit its application fields. [0003] Dacromet is a metal surface anti-corrosion coating technology developed by the United States in the 1970s and introduced to China in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/10C09D7/12
CPCC09D5/103C09D5/106
Inventor 丁怀东孙丹萍徐阳赖健平瞿研
Owner THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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