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Aqueous composite zinc-aluminum anticorrosion coating

An anti-corrosion coating, zinc-aluminum technology, applied in the direction of anti-corrosion coatings, coatings, etc., can solve the problems of weak scratch resistance, high carcinogenicity, human health threats, etc., to improve mechanical properties, corrosion resistance, and good dispersibility and stability, the effect of improving storage stability

Active Publication Date: 2018-04-27
WINSTAR CHEM SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the Cr present in dacromet paint 6+ It has high toxicity and high carcinogenicity, causes huge pollution to the environment, and is a major threat to human health. Therefore, the research and development of chrome-free zinc-aluminum coatings has become the focus of people's concern
In addition, the shortcomings of Dacromet coating, such as high sintering temperature, high friction coefficient and weak scratch resistance, also need to be compensated.
[0004] The hydrogen evolution activity of zinc-aluminum powder in water-based environment is effectively inhibited by the passivation effect of hexavalent chromium in Dacromet coating, but it is prominent in chromium-free zinc-aluminum coatings, resulting in hydrogen evolution during storage or use. The "fat listening" phenomenon occurs, which limits the application of chromium-free zinc-aluminum coatings
At present, people have adopted various methods to passivate the zinc-aluminum mixed powder, but there are still some shortcomings, such as: the problem of hydrogen evolution still exists, the dispersion of the coating is not good, and the stability needs to be improved, etc.

Method used

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preparation example Construction

[0102] As a kind of preferred technical scheme of the present invention, the preparation method of described modified graphene at least comprises the following steps:

[0103] a. Take graphite powder and add dissolved K 2 S 2 o 8 and P 2 o 5 Graphite powder, K 2 S 2 o 8 ,P 2 o 5 The mass ratio of sulfuric acid and sulfuric acid is 2:1:1:5, stirred and cooled to room temperature naturally, diluted with deionized water, filtered, washed with water until neutral, and the product was dried in air; the above product was added to 18mol / L of ice bath In sulfuric acid, gradually add KMnO during stirring 4 , graphite powder, sulfuric acid and KMnO 4 The mass ratio of the graphite powder is 1:36:3, and the reaction temperature is controlled within 15°C; then the mixture is transferred to a water bath at 35°C, and deionized water is gradually added. The mass of deionized water is 45 times that of graphite powder, and the reaction is stirred for 2 hours. Then add deionized wate...

Embodiment 1

[0139] Embodiment 1 provides a kind of water-based composite zinc-aluminum anticorrosion paint, by weight, at least includes the following raw materials:

[0140] Zinc-aluminum alloy powder: 40 parts by weight,

[0141] Passivator: 2 parts by weight,

[0142] Binding agent: 10 parts by weight,

[0143] Dispersant: 25 parts by weight,

[0144] Wetting agent: 0.5 parts by weight,

[0145] Filler: 5 parts by weight,

[0146] Auxiliary agent: 0.5 parts by weight,

[0147] Solvent: 100 parts by weight;

[0148] The content of aluminum in the zinc-aluminum alloy powder is 15wt%, and the grade is Scott Chemical Co., Ltd. AZ-15; the passivator is sodium phosphomolybdate; the binder is γ-glycidol Etheroxypropyltriethoxysilane; the dispersing agent is polyoxyethylene sorbitan laurate, the trade mark is Guangdong Runhua Chemical Co., Ltd. Tween 20; the wetting agent is polyethylene glycol 6000; the filler is a mixture of nano-titanium dioxide and modified graphene, the weight rati...

Embodiment 2

[0160] Embodiment 2 provides a kind of water-based composite zinc-aluminum anticorrosion paint, by weight, at least includes the following raw materials:

[0161] Zinc-aluminum alloy powder: 65 parts by weight,

[0162] Passivator: 5 parts by weight,

[0163] Binding agent: 18 parts by weight,

[0164] Dispersant: 45 parts by weight,

[0165] Wetting agent: 5 parts by weight,

[0166] Filler: 15 parts by weight,

[0167] Auxiliary agent: 2 parts by weight,

[0168] Solvent: 100 parts by weight;

[0169] The content of aluminum in the zinc-aluminum alloy powder is 15wt%, and the grade is Scott Chemical Co., Ltd. AZ-15; the passivator is sodium phosphomolybdate; the binder is γ-aminopropyl Triethoxysilane; the dispersant is polyoxyethylene sorbitan laurate, and the trade mark is Guangdong Runhua Chemical Co., Ltd. Tween 20; the wetting agent is polyethylene glycol 6000; Described filler is the mixture of nano-titanium dioxide and modified graphene, and the weight ratio of...

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Abstract

The invention relates to the field of coatings and particularly relates to an aqueous composite zinc-aluminum anticorrosion coating. The aqueous composite zinc-aluminum anticorrosion coating comprises, by weight, 40-65 parts of zinc-aluminum alloy powder, 2-5 parts of a passivating agent, 10-18 parts of a binder, 25-45 parts of a dispersing agent, 0.5-5 parts of a wetting agent, 5-15 parts of a filler, 0.5-2 parts of an additive and 100 parts by weight of a solvent. The filler comprises one or more of nano-silica, nano-titanium dioxide, nano-zinc oxide, modified graphene, nano-alumina, mica powder, talc powder, calcium carbonate, barium sulfate, kaolin, aluminum silicate and nano-cerium oxide. The solvent is a mixture of ethanol and water. The content of ethanol is 20wt% to 50wt%.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a water-based composite zinc-aluminum anticorrosion coating. Background technique [0002] Dacromet, also known as zinc-aluminum-chromium coating, is a coating with high corrosion resistance. Because its treatment process adopts a safe closed-cycle coating method, and the whole process has no pollution discharge, it is called the "green production" technology of surface treatment, which can replace traditional processes such as electro-galvanizing and electro-chrome plating, and has developed rapidly worldwide. Compared with traditional electroplating, hot-dip plating and other processes, Dacromet technology has high corrosion resistance, no hydrogen embrittlement, high temperature resistance, controllable coating thickness, and less environmental pollution, so it is widely used in automobiles, ships, Railway, wind power, bridge, military and other industries. [0003] Dacromet is a wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04C09D5/10C09D7/61C09D7/62C09D7/63C09D7/65
CPCC09D4/00C09D5/103C09D5/106C08G77/14C08G77/26C08G77/20C08G77/28
Inventor 张志恒
Owner WINSTAR CHEM SHANGHAI
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