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Hydroxyapatite nanosheet composite anticorrosive paint as well as preparation method and application thereof

A hydroxyapatite and anti-corrosion coating technology, applied in anti-corrosion coatings, epoxy resin coatings, coatings, etc., can solve the problems of accelerating the corrosion of steel substrates and restricting the direct application of graphene, so as to avoid void defects and improve long-term efficiency. Anti-corrosion ability, good dispersion effect

Inactive Publication Date: 2020-11-24
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high conductivity of graphene will form a conductive channel in the coating and accelerate the corrosion of the steel substrate, which limits the direct application of graphene in anti-corrosion coatings. The selection of insulating two-dimensional nanosheets can avoid this defect

Method used

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  • Hydroxyapatite nanosheet composite anticorrosive paint as well as preparation method and application thereof
  • Hydroxyapatite nanosheet composite anticorrosive paint as well as preparation method and application thereof
  • Hydroxyapatite nanosheet composite anticorrosive paint as well as preparation method and application thereof

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preparation example Construction

[0043] Another aspect of the embodiments of the present invention provides a method for preparing a hydroxyapatite nanosheet composite anti-corrosion coating, comprising: modifying hydroxyapatite nanosheets with a two-dimensional nanostructure, a dispersant, an epoxy resin, and curing Agent, leveling agent and defoamer are uniformly mixed according to the aforementioned mass ratio to obtain hydroxyapatite nanosheet composite anti-corrosion coating.

[0044] In some preferred embodiments, the preparation method specifically includes:

[0045] The dispersant is added to the dispersion liquid of hydroxyapatite nanosheets with two-dimensional nanostructures for modification treatment, and after ultrasonic mixing, it is stirred in an aerobic environment for 20 to 30 hours to form the first hydroxyapatite nanosheets containing modified hydroxyapatite nanosheets. a mixed system;

[0046] Add the first mixing system to epoxy resin, then add leveling agent and defoamer in turn and mix...

Embodiment 1

[0072] Dissolve 12g of calcium nitrate tetrahydrate and 4g of ammonium dihydrogen phosphate in 100ml of deionized water, stir it magnetically to dissolve, add 8g of urea to the above mixture, transfer the mixture to a hydrothermal reaction kettle for 3h at 120°C for hydrothermal reaction . After centrifugation, the supernatant was removed, the lower solid was washed with absolute ethanol and deionized water, and dried under vacuum at 35°C to obtain hydroxyapatite nanosheets with a two-dimensional nanostructure.

[0073] 1 g of the above-prepared hydroxyapatite nanosheets with a two-dimensional nanostructure was dissolved in 400 mL of tetrahydrofuran (pH=8.5), and then 0.8 g of dopamine hydrochloride was added and stirred continuously for 24 h. After centrifugation, the supernatant was removed, the solids in the lower layer were washed with absolute ethanol and deionized water, and dried under vacuum at 35°C to obtain polydopamine-modified hydroxyapatite nanosheets.

[0074] T...

Embodiment 2

[0078] Dissolve 4g of calcium nitrate tetrahydrate and 4g of ammonium dihydrogen phosphate in 100ml of deionized water, stir it magnetically to dissolve, add 4g of urea to the above mixture, transfer the mixture to a hydrothermal reaction kettle for 3h at 120°C for hydrothermal reaction . After centrifugation, the supernatant was removed, the lower solid was washed with absolute ethanol and deionized water, and dried under vacuum at 35°C to obtain hydroxyapatite nanosheets with a two-dimensional nanostructure.

[0079] 1 g of the above-prepared hydroxyapatite nanosheets with a two-dimensional nanostructure was dissolved in 400 mL of tetrahydrofuran (pH=6.5), and then 0.8 g of dopamine hydrochloride was added and stirred continuously for 24 h. After centrifugation, the supernatant was removed, the solids in the lower layer were washed with absolute ethanol and deionized water, and dried under vacuum at 35°C to obtain dopamine-modified hydroxyapatite nanosheets.

[0080] Take 1...

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Abstract

The invention discloses hydroxyapatite nanosheet composite anticorrosive paint as well as a preparation method and application thereof. The hydroxyapatite nanosheet composite anticorrosive paint comprises modified hydroxyapatite nanosheets with two-dimensional nanostructures, a dispersing agent, epoxy resin, a curing agent, a leveling agent and a defoaming agent, wherein the dispersing agent comprises any one or a combination of two or more of aniline, tannic acid, dopamine and pyrrole and / or a polymer thereof; and the modified hydroxyapatite nanosheets are uniformly dispersed in the compositeanticorrosive paint. The composite anticorrosive paint provided by the invention is high in stability, difficult to coagulate, lasting in anticorrosive performance, simple in preparation process, lowin cost and suitable for large-scale production. The composite anticorrosive paint has an obvious barrier effect on permeation of a corrosive medium, can be coated on the surface of a metal materialto be used for anticorrosive protection of marine facilities and equipment serving for a long time, and can effectively delay corrosion of a metal substrate and prolong the service life of the marinematerial.

Description

technical field [0001] The invention relates to an anti-corrosion coating, in particular to a hydroxyapatite nanosheet composite anti-corrosion coating and a preparation method thereof, as well as a preparation method and application of a corresponding coating, belonging to the technical field of metal anti-corrosion coatings. Background technique [0002] Due to the characteristics of high salt, high humidity and high temperature in the marine environment, high requirements are placed on the anti-corrosion protection of materials. The corrosion of metal components in the marine environment is likely to cause serious safety hazards and huge economic losses. In order to reduce the harmful effects of marine corrosion, some effective strategies are used to delay the corrosion process, such as cathodic protection and coating technology. Coating polymer protective coatings on metal surfaces is one of the commonly used protective technologies. However, traditional protective coat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/02C09D163/00C09D5/08
CPCC08K2003/325C08K2201/003C08K2201/011C08K2201/016C09D5/08C09D163/00C08K9/04C08K7/00C08K3/32
Inventor 王立平程莉赵海超
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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