Anticorrosive waterborne epoxy coating based on divalent zinc ions and phytic acid modified graphene oxide and preparation method of anticorrosive waterborne epoxy coating

A technology of water-based epoxy and water-based epoxy resin, which is applied in the direction of anti-corrosion coatings, epoxy resin coatings, coatings, etc., can solve the problems of blocking the corrosion process, poor compactness of water-based epoxy coatings and cannot effectively block, and achieve improved Dispersion, enhance the ability to resist chloride ion corrosion, improve the effect of anti-corrosion performance

Active Publication Date: 2022-05-27
TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the poor compactness of the water-based epoxy coating used in the prior art, which cannot effectively prevent the diffusion of corrosive media to the metal substrate, and the repair function cannot be spontaneously produced at the corrosion site after the coating is damaged, so as to block the corrosion process, etc., the present invention provides a A kind of anticorrosion water-based epoxy coating based on divalent zinc ions and phytic acid modified graphene oxide and its preparation method prepares an anticorrosion coating with excellent anticorrosion performance and better anticorrosion effect, and its dispersibility is significantly improved

Method used

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  • Anticorrosive waterborne epoxy coating based on divalent zinc ions and phytic acid modified graphene oxide and preparation method of anticorrosive waterborne epoxy coating
  • Anticorrosive waterborne epoxy coating based on divalent zinc ions and phytic acid modified graphene oxide and preparation method of anticorrosive waterborne epoxy coating
  • Anticorrosive waterborne epoxy coating based on divalent zinc ions and phytic acid modified graphene oxide and preparation method of anticorrosive waterborne epoxy coating

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preparation example Construction

[0027] The invention provides an anti-corrosion coating based on modified graphene of phytic acid and hexahydrate zinc nitrate and a preparation method thereof. The process of the method is as follows: adding phytic acid, hexahydrate zinc nitrate and graphene oxide into water, and dispersing evenly Then react at room temperature to obtain modified graphene; after dispersing the modified graphene in deionized water, add it to the mixed solution of resin and curing agent and disperse evenly to obtain the modified graphene based on phytic acid and divalent zinc ions. Graphene coating mixture. The coating mixture is coated on the surface of the metal substrate, and cured at room temperature to form a film to obtain a metal anti-corrosion coating.

[0028] Preferably, the amount of modified graphene oxide added in the coating is 0.05wt% to 0.10wt%.

[0029] Preferably, the divalent zinc ion precursor in the preparation process of the modified graphene oxide is zinc nitrate hexahyd...

Embodiment 1

[0040] This embodiment is the preparation of GO@(Zn(II)-PA) / WEC coating, as follows:

[0041] 1. Filler preparation: Take 20ml of GO solution with a concentration of 2mg / ml and add it to 140ml of deionized water for ultrasonic dispersion for 15min, and adjust the pH of the above GO solution to 8.0 by adding 0.1mol / L NaOH solution dropwise. Add 300mg Zn(NO 3 ) 2 ·6H 2 O, after magnetic stirring at room temperature at 560 rpm for 1 hour; then add 2.856 g of PA solution with a concentration of 70 wt.%, and also at room temperature at 560 rpm with magnetic stirring for 1 hour. After the reaction, ultrasonically cleaned with deionized water for 10 minutes, centrifuged at 10,000 r / min for 3 minutes, and repeatedly cleaned for 3 times to obtain GO@(Zn(II)-PA) filler.

[0042] 2. Coating preparation: Take 2.5mg of the above-obtained GO@(Zn(II)-PA) filler and put it in 1ml of deionized water, after ultrasonic dispersion for 15min, mix with 2.13g of water-based epoxy The ratio is 5:...

Embodiment 2

[0044] This embodiment is the preparation of GO@(Zn(II)-PA) / WEC coating, as follows:

[0045] 1. Filler preparation: 15ml of GO solution with a concentration of 2mg / ml was added to 100ml of deionized water for ultrasonic dispersion for 15min, and the pH of the above GO solution was adjusted to 8.0 by dropwise addition of 0.1mol / L NaOH solution. Add 200mg Zn(NO 3 ) 2 ·6H 2 O, after stirring at room temperature at 600 rpm for 1 hour; then add 2.0 g of PA solution with a concentration of 70 wt.%, and also stir at room temperature at 560 rpm for 1 hour. After the reaction, ultrasonically cleaned with deionized water for 10 minutes, centrifuged at 10,000 r / min for 3 minutes, and repeatedly cleaned for 3 times to obtain GO@(Zn(II)-PA) filler.

[0046] 2. Coating preparation: Take 2.5mg of the above-obtained GO@(Zn(II)-PA) filler and put it in 1ml of deionized water, after ultrasonic dispersion for 15min, mix with 2.13g of water-based epoxy The ratio is 5:9) stir well and let sta...

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Abstract

The invention discloses an anti-corrosion water-based epoxy coating based on divalent zinc ions and phytic acid modified graphene oxide and a preparation method of the anti-corrosion water-based epoxy coating, and belongs to the technical field of anti-corrosion water-based epoxy coatings. The preparation method comprises the following steps: adjusting the pH value of a solution, selecting zinc nitrate hexahydrate and phytic acid as precursors, loading phytic acid functional groups and divalent zinc ions on graphene oxide, adding a modified graphene oxide filler into waterborne epoxy and a curing agent, mixing, and curing to obtain the waterborne epoxy coating. In a 3.5% wt. NaCl solution, compared with a blank waterborne epoxy coating, the corrosion resistance of the coating is improved by more than 5 times, the corrosion current density is reduced to an order of magnitude, and the chloride ion corrosion resistance of the coating is greatly enhanced. According to the graphene oxide loaded with phytic acid functional groups and divalent zinc ions, the dispersity of the graphene oxide in a water-based epoxy coating is improved, and the corrosion resistance of the water-based epoxy coating in a seawater environment is remarkably enhanced.

Description

technical field [0001] The invention relates to the technical field of anti-corrosion water-based epoxy coatings, in particular to an anti-corrosion water-based epoxy coating based on divalent zinc ions and phytic acid-modified graphene oxide and a preparation method thereof. Corrosion caused by chloride ions. Background technique [0002] With the vigorous development of my country's seaport terminals, sea-crossing bridges, tunnels and coastal engineering construction, the number of reinforced concrete structures in coastal areas has grown rapidly. However, under the harsh marine environment, some reinforced concrete structures have corroded steel bars about 20 years after they were built, far below their 100-year design life, and their safety is seriously threatened. Corrosion of steel bars will lead to premature failure of concrete structures, seriously affecting the service life of marine engineering structures and causing huge economic losses. Applying epoxy coating i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/08
CPCC09D163/00C09D5/08C08K9/04C08K9/02C08K3/042Y02P20/10
Inventor 曹凤婷杲广尧王铁钢范其香陶建涛刘艳梅贺泽权
Owner TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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