Water-based inorganic zinc-rich anticorrosive paint and preparation method thereof

An inorganic zinc-rich, anti-corrosion coating technology, applied in anti-corrosion coatings, alkali metal silicate coatings, coatings, etc., can solve the problems of agglomeration, zinc powder dissolution, waste of resources, etc., achieve delayed electrochemical reaction, low zinc powder The effect of adding amount and reducing the amount of zinc powder

Inactive Publication Date: 2019-11-12
SHENZHEN ACAD OF AEROSPACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the anti-corrosion coating disclosed in this patent is an oily system, and a large amount of diluents are organic solvents, which is not environmentally friendly.
At present, traditional solvent-based organic anti-corrosion coatings are gradually replaced by water-based and inorganic anti-corrosion coatings due to their large VOC, environmental pollution, unsafety, waste of resources, and poor heat resistance.
[0004] Water-based inorganic zinc-rich anti-corrosion coatings have gradually become the development trend of the industry. It has excellent comprehensive performance and many advantages, but there are also some shortcomings in practical applications: theoretically speaking, the higher the zinc powder content, the better the cathodic protection effect of zinc-rich anti-corrosion coatings. The better, too low zinc powder content will lead to the inability to form an effective conductive cathodic protection network, but when the zinc powder content is high, it is easy to cause the dissolution problem of zinc powder in the coating, the film is easy to foam, and the microcosm of the coating Porosity leads to poor barrier performance and poor anti-corrosion performance, causing problems such as premature failure of the coating and crack tendency when the coating is thick
The Chinese patent 201610812286.2 application discloses that by adding silicon-acrylic emulsion and graphene oxide to increase the flexibility of the coating and reduce the amount of zinc powder, when the amount of zinc powder added is about 20%, the salt spray resistance of the coating is increased from 720h to 1200h, but The salt spray resistance of the coating needs to be further improved, and it is not easy to guarantee the long-term cathodic protection effect when the amount of zinc powder is low. In addition, the water solubility of the added silicon acrylic emulsion is not good, which may easily lead to uneven dispersion of various raw materials in the coating. Agglomeration becomes a coating defect, which in turn promotes coating corrosion

Method used

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Embodiment 1

[0029] The present embodiment provides a kind of water-based inorganic zinc-rich anticorrosion coating, which is prepared according to the following steps:

[0030] (1) Preparation of silicate solution: take raw materials potassium hydroxide, silica sol and water, wherein the molar ratio of potassium hydroxide, silica sol and water is 1:8:6. Pre-mix and dissolve potassium hydroxide and water to obtain a potassium hydroxide solution, then gradually add the potassium hydroxide solution dropwise to the silica sol under rapid stirring, and react for 1 hour at a water bath temperature of 50°C to prepare a silicate Potassium silicate solution with a modulus of 4.0.

[0031] (2) Preparation of graphene aqueous dispersion: Take 0.2g of graphene dispersion aid polyethylene glycol mono-4-nonylphenyl ether and add it to 85g of pure water, stir and mix evenly with strong ultrasonic machinery, then gradually add 15g of graphite Graphene, strong ultrasonic mechanical stirring for 1 h to ob...

Embodiment 2

[0036] The present embodiment provides a kind of water-based inorganic zinc-rich anticorrosion coating, which is prepared according to the following steps:

[0037] (1) Preparation of silicate solution: take raw materials sodium hydroxide, potassium hydroxide, silica sol and water, wherein the molar ratio of sodium hydroxide, potassium hydroxide, silica sol and water is 0.3:0.7:14:10. Sodium hydroxide, potassium hydroxide and water are premixed and dissolved to obtain a mixed solution, and then, under rapid stirring, the mixed solution is gradually added dropwise to the silica sol, and the reaction time is 1 hour at a water bath temperature of 50 ° C. The prepared modulus is 6.5 Silicate solution.

[0038] (2) Preparation of graphene aqueous dispersion: Take 0.2g of graphene dispersion aid polyvinylpyrrolidone and add it to 80g of pure water, stir and mix evenly with strong ultrasonic machinery, then gradually add 20g of graphene, and stir with strong ultrasonic machinery for ...

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Abstract

The invention discloses water-based inorganic zinc-rich anticorrosive paint and a preparation method thereof. The water-based inorganic zinc-rich anticorrosive paint comprises 30-50 wt% of a silicate,45-70 wt% of a two-dimensional barrier material and 0-5 wt% of a paint assistant, wherine the modulus of a silicate solution is greater than or equal to 4.0, the two-dimensional barrier material comprises modified flaky zinc powder, modified sericite and graphene, the modified flaky zinc powder is prepared by modifying flaky zinc powder through a surface modifier, the modified sericite is prepared by modifying sericite through a surface modifier, and the surface modifier is an organosilane coupling agent. The compact two-dimensional barrier layer is formed under the combined action of the modified sericite and the graphene, and the corrosion resistance of the paint can be remarkably improved, so that the use amount of zinc powder can be reduced on the premise of ensuring the corrosion resistance of the paint, and the paint achieves the effects of low zinc powder addition amount and excellent corrosion resistance.

Description

technical field [0001] The invention relates to an anti-corrosion coating, in particular to a water-based inorganic zinc-rich anti-corrosion coating and a preparation method thereof. Background technique [0002] The iron and steel industry is the foundation of our country's industry, but at present, the economic loss caused by corrosion in our country is quite huge every year. The structure scrapped due to steel corrosion accounts for about 20% of the total output of steel production. With the continuous increase of my country's economic volume , the economic loss caused by metal corrosion will continue to increase, so it is urgent to improve metal anti-corrosion technology. [0003] Coating anti-corrosion is an important means of steel anti-corrosion. Chinese patent 201811051485.1 discloses an oily graphene anti-corrosion slurry, which uses epoxy-modified silane coupling agent and amino-modified organic acid coupling agent to improve the graphene in the The dispersion in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/04C09D5/10C09D7/62
CPCC09D1/04C09D5/106C09D7/62
Inventor 陈英刘海涛晏义伍
Owner SHENZHEN ACAD OF AEROSPACE TECH
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