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Method for preparing LDHs/GO-MA self-repairing anti-corrosion coating

A technology for corroding coatings and coatings, applied in the field of materials, can solve the problems of shortened service life and corrosion of coatings, and achieve the effects of improving bonding strength, improving corrosion inhibition efficiency, and simple methods

Active Publication Date: 2021-07-23
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional anti-corrosion coatings can only achieve passive protection. After damage, the surface substrate will leak out, corrosion is more likely to occur, and the service life of the coating will be greatly shortened.

Method used

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  • Method for preparing LDHs/GO-MA self-repairing anti-corrosion coating
  • Method for preparing LDHs/GO-MA self-repairing anti-corrosion coating
  • Method for preparing LDHs/GO-MA self-repairing anti-corrosion coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Prepare a saturated trisodium phosphate solution at room temperature, weigh 2 g of magnesium-aluminum layered double hydroxide, disperse in the above saturated solution, ultrasonically oscillate for 30 min, then magnetically stir for 4 h, and filter the solution with suction And the obtained product was washed several times with deionized water and ethanol, and the washed product was dried in an oven at 60°C for 8 h and then ground into a powder, which was recorded as powder A; 10 ml of acetic acid was dispersed in 30 ml of deionized water, and then Slowly add 0.8 g of chitosan during the stirring process to obtain a viscous liquid. After the liquid is clarified, add 0.53 g of thiocarbohydrazide. After stirring for 45 min, add 2 ml of formaldehyde. Mix well at room temperature for 12 h to obtain a gelatinous solution. Gel-like mixture, sodium hydroxide aqueous solution was added to the gel-like mixture, the precipitate obtained by neutralization was washed wit...

Embodiment 2

[0028] Example 2: Prepare a saturated trisodium phosphate solution at room temperature, weigh 2 g of magnesium-aluminum layered double hydroxide, disperse it in the above saturated solution, stir it magnetically for 4 h after ultrasonic oscillation for 30 min, and filter the solution with suction And the obtained product was washed several times with deionized water and ethanol, and the washed product was dried in an oven at 60°C for 8 h and then ground into a powder, which was recorded as powder A; 10 ml of acetic acid was dispersed in 30 ml of deionized water, and then Slowly add 0.8 g of chitosan during the stirring process to obtain a viscous liquid. After the liquid is clarified, add 0.53 g of thiocarbohydrazide. After stirring for 45 min, add 2 ml of formaldehyde. Mix well at room temperature for 12 h to obtain a gelatinous solution. Gel-like mixture, sodium hydroxide aqueous solution was added to the gel-like mixture, the precipitate obtained by neutralization was washed...

Embodiment 3

[0029]Example 3: Prepare a saturated trisodium phosphate solution at room temperature, weigh 2 g of magnesium-aluminum layered double hydroxide, disperse it in the above saturated solution, stir it magnetically for 4 h after ultrasonic oscillation for 30 min, and filter the solution with suction And the obtained product was washed several times with deionized water and ethanol, and the washed product was dried in an oven at 60°C for 8 h and then ground into a powder, which was recorded as powder A; 10 ml of acetic acid was dispersed in 30 ml of deionized water, and then Slowly add 0.8 g of chitosan during the stirring process to obtain a viscous liquid. After the liquid is clarified, add 0.53 g of thiocarbohydrazide. After stirring for 45 min, add 2 ml of formaldehyde. Mix well at room temperature for 12 h to obtain a gelatinous solution. Gel-like mixture, sodium hydroxide aqueous solution was added to the gel-like mixture, the precipitate obtained by neutralization was washed ...

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Abstract

The invention discloses a method for preparing an LDHs / GO-MA self-repairing anti-corrosion coating, which comprises the following steps of preparing magnesium-aluminum layered double hydroxides with a self-repairing function, modifying chitosan through thiocarbohydrazide, preparing a green and environment-friendly corrosion inhibitor, modifying graphene oxide by using maleic anhydride to obtain carboxylated graphene oxide, and finally, by utilizing esterification reaction, mixing liquid obtained by the esterification reaction with polyurethane to obtain a coating, and spraying the coating on the surface of a substrate. The magnesium-aluminum layered double-metal hydroxide is used as a nano container loaded modified chitosan corrosion inhibitor, the carboxyl content of the modified graphene oxide is increased, the modified graphene oxide is more easily subjected to esterification reaction with the modified chitosan and the magnesium-aluminum layered double-metal hydroxide, and the combination of self-repairing and the corrosion inhibitor enables a coating to have a stronger anti-corrosion effect; and the damaged surface can be quickly repaired after the coating is damaged due to the film-forming property of the phosphate ions, so that the self-repairing effect is achieved, and the service life of the coating is prolonged.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a preparation method of an LDHs / GO-MA self-repairing and anti-corrosion functional coating. Background technique [0002] Since the discovery and use of metal products by human beings, the corrosion of metal has been bothering people. It will not only cause huge economic losses in production and life, but also cause very serious safety and environmental problems. Among the many metal anti-corrosion methods, the coating protection method is the longest and easiest to implement. Anti-corrosion coatings have also been widely used in transportation, industry, energy, marine and other industries. However, traditional anti-corrosion coatings can only achieve passive protection. After damage, the surface substrate will leak out, corrosion is more likely to occur, and the service life of the coating will be greatly shortened. In order to solve this problem, the present invention propose...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D105/08C09D5/08C09D7/62C08B37/08
CPCC08B37/003C08K2003/324C09D5/08C09D175/04C09D7/62C08L5/08C08K9/04C08K3/042C08K9/02C08K3/22C08K3/32
Inventor 谢婵贾宇薛名山殷祚炷罗一丹洪珍付俊超周培林
Owner NANCHANG HANGKONG UNIVERSITY
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