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Waterborne epoxy resin anticorrosion coating and preparation method thereof

A technology of water-based epoxy resin and anti-corrosion coating

Inactive Publication Date: 2020-01-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Almost all traditional coatings are solvent-based. The advantages of solvent-based coatings are fast film-forming speed, good coating strength and corrosion resistance. The disadvantage is that volatile organic compounds (VOC) in solvent-based coatings, harmful gases during use Volatile will cause environmental pollution
[0003] The current development trend is that solvent-based coatings will be gradually replaced by environmentally friendly water-based coatings, but water-based coatings often have the disadvantage of slow film-forming speed, and the coating's compactness, strength, water resistance, acid and alkali resistance Compared with solvent-based coatings, the anti-corrosion performance of the coating is also reduced
Epoxy resin is the most important resin used for metal anti-corrosion. It is a development trend to replace solvent-based epoxy resin with water-based epoxy resin, but water-based epoxy resin has the same problems as other water-based coatings, such as the strength of the coating, Poor toughness and corrosion resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Preparation of graphene oxide powder by wet grinding oxidation method:

[0024] Mix 8 parts of concentrated sulfuric acid and 2 parts of concentrated phosphoric acid in parts by mass, add the mixture of 1 part of flake graphite powder and 3.5 parts of potassium permanganate powder in 20 minutes to the concentrated sulfuric acid and concentrated phosphoric acid In the mixture, continue to stir for 0.5 hours after the addition; transfer the above mixture to the ball mill tank of the ball mill, and follow the ball milling speed of 100 rpm for 1 hour, the ball milling speed of 350 rpm for 1.5 hours, and the ball milling speed of 520 rpm Ball mill for 2.5 hours. After ball milling, transfer the mixture in the ball mill tank to the reactor. Slowly add 100 parts of water into the reactor within 25 minutes under stirring. Control the system temperature at 35°C and slowly drop it within 10 minutes. Add 10 parts of hydrogen peroxide with a mass fraction of 30%, and then repeat...

Embodiment 2

[0036] 1. Preparation of graphene oxide powder by wet grinding oxidation method:

[0037] Mix 10 parts of concentrated sulfuric acid and 3 parts of concentrated phosphoric acid in parts by mass, and add the mixture of 2 parts of flake graphite powder and 3 parts of potassium permanganate powder in portions within 25 minutes to the concentrated sulfuric acid and concentrated phosphoric acid. In the mixture, continue to stir for 1.0 hours after the addition; transfer the above mixture to the ball mill tank of the ball mill, and follow the ball milling speed of 120 rpm for 1.5 hours, the ball milling speed of 320 rpm for 2.0 hours, and the ball milling speed of 510 rpm Ball mill for 2.5 hours. After ball milling, transfer the mixture in the ball mill tank to the reactor. Slowly add 120 parts of water into the reactor within 28 minutes under stirring. Control the system temperature at 38°C and slowly drop it within 13 minutes. Add 8 parts of hydrogen peroxide with a mass fraction ...

Embodiment 3

[0049] 1. Preparation of graphene oxide powder by wet grinding oxidation method:

[0050] Mix 12 parts of concentrated sulfuric acid and 4 parts of concentrated phosphoric acid in parts by mass, add the mixture of 1.8 parts of flake graphite powder and 4 parts of potassium permanganate powder in portions within 30 minutes to the concentrated sulfuric acid and concentrated phosphoric acid In the mixture, continue to stir for 0.5 hours after the addition; transfer the above mixture to the ball mill tank of the ball mill, and follow the ball milling speed of 140 rpm for 1.5 hours, the ball milling speed of 340 rpm for 1.5 hours, and the ball milling speed of 550 rpm Ball mill for 2 hours. After ball milling, transfer the mixture in the ball mill tank to the reactor. Slowly add 150 parts of water into the reactor within 30 minutes while stirring. Control the system temperature at 36°C and slowly drop it within 14 minutes. Add 7 parts of hydrogen peroxide with a mass fraction of 30...

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Abstract

The invention discloses a waterborne epoxy resin anticorrosion coating and a preparation method thereof. The method comprises the following steps: preparing a bismuth vanadate and graphene oxide heterojunction composite material through a high-pressure hydrothermal reaction, and compounding the bismuth vanadate and graphene oxide heterojunction composite material with a waterborne epoxy resin to prepare the waterborne epoxy resin anticorrosion coating. The surface of metal is coated with the coating, the bismuth vanadate and graphene oxide heterojunction composite material in a coating layer generates electrons when encountering light, and the electrons are transmitted to the surface of the metal and are enriched to reduce the self-corrosion potential of the metal, so the photoinduced cathodic protection effect is achieved. A graphene oxide nanosheet layer has a reinforcing and toughening effect on the coating layer formed by compounding the waterborne epoxy resin, and the graphene oxide nanosheet layer and the formed compact coating layer can physically block various corrosion effects. The waterborne epoxy resin anticorrosion prepared in the invention has the advantages of environmental friendliness, good film adhesion, and good corrosion and aging resistance, and can be used for metal protective coating of bridges, ship shells, transmission towers, underground oil and gas pipelines and the like.

Description

technical field [0001] The invention relates to the preparation of an epoxy resin functional coating, in particular to a water-based epoxy resin anticorrosion coating and a preparation method thereof. Background technique [0002] According to the survey report on metal corrosion, the total loss caused by metal corrosion in my country can reach two trillion yuan. In order to solve the problem of metal corrosion, relevant technical personnel have adopted a variety of anti-corrosion measures to inhibit the corrosion of metal equipment. Among them Organic coating anti-corrosion technology is the most widely used because of its simple construction and wide applicability. Almost all traditional coatings are solvent-based. The advantages of solvent-based coatings are fast film-forming speed, good coating strength and corrosion resistance. The disadvantage is that volatile organic compounds (VOC) in solvent-based coatings, harmful gases during use Volatile will cause environmental ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/08
CPCC08L2201/08C09D5/08C09D163/00C08K3/042C08K3/24
Inventor 吕生华郭子轶杨震杨俊杰刘相
Owner SHAANXI UNIV OF SCI & TECH
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