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Dual-modified waterborne epoxy resin anticorrosive paint and preparation method thereof

A water-based epoxy resin, double modification technology, applied in epoxy resin coatings, anti-corrosion coatings, coatings and other directions, can solve the problem of low anti-corrosion performance of water-based epoxy resin, enhance adhesion and mechanical properties, reduce micro Pore ​​structure, effect of delay time

Inactive Publication Date: 2021-08-27
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a double modified water-based epoxy resin anti-corrosion coating and a preparation method thereof, and solve the problem that the water-based epoxy resin anti-corrosion performance is not high

Method used

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  • Dual-modified waterborne epoxy resin anticorrosive paint and preparation method thereof

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preparation example Construction

[0020] Modified SiO 2 The preparation method of supported hexagonal boron nitride comprises the following steps:

[0021] (1) Add ammonia solution, deionized water, and absolute ethanol to the reaction bottle, the volume ratio of the three is 1:2-3:5-7, put it in a water bath device, heat up to 55-65°C, and stir well Add tetraethyl orthosilicate and silane coupling agent KH550 respectively, the mass ratio of the two is 1:0.2-0.4, and continue to stir for 18-24h. After the reaction is completed, the precipitate obtained is washed by centrifugation with water and absolute ethanol to remove residual reagents, and finally the product is vacuum-dried at 60-70°C to obtain aminated nano-SiO 2 .

[0022] (2) Add deionized water and hexagonal boron nitride to the reaction bottle, and the solution is ultrasonically treated for 30-60min, and the pH value is adjusted to 8.5 with Tris-HCl buffer solution, adding dopamine, hexagonal boron nitride and dopamine The mass ratio is 1:0.2-0.3,...

Embodiment 1

[0028] (1) Preparation of aminated nano-SiO 2 Component 1: Add 9mL of ammonia solution, deionized water, and absolute ethanol to the reaction bottle, the volume ratio of the three is 1:2:5, put it in a water bath, raise the temperature to 60°C, stir well, and then add 4.5 g tetraethyl orthosilicate and silane coupling agent KH550, the mass ratio of the two is 1:0.2, continue to stir for 24h. After the reaction was completed, the obtained precipitate was centrifuged and washed with water and absolute ethanol to remove residual reagents, and finally the product was vacuum-dried at 60 °C to prepare aminated nano-SiO 2 Component 1.

[0029] (2) Preparation of polydopamine-modified hexagonal boron nitride component 1: Add 200 mL of deionized water and 2.0 g of hexagonal boron nitride into the reaction flask, ultrasonicate the solution for 60 minutes, and adjust the pH in the system with Tris-HCl buffer The value is 8.5, adding dopamine, the mass ratio of hexagonal boron nitride a...

Embodiment 2

[0033] (1) Preparation of aminated nano-SiO 2 Component 2: Add 12mL of ammonia solution, deionized water, and absolute ethanol to the reaction bottle. The volume ratio of the three is 1:2.5:6. g tetraethyl orthosilicate and silane coupling agent KH550, the mass ratio of the two is 1:0.3, continue to stir for 24h. After the reaction was completed, the obtained precipitate was centrifuged and washed with water and absolute ethanol to remove residual reagents, and finally the product was vacuum-dried at 60 °C to prepare aminated nano-SiO 2 Component 2.

[0034] (2) Preparation of polydopamine-modified hexagonal boron nitride component 2: Add 200 mL of deionized water and 2.0 g of hexagonal boron nitride to the reaction flask, ultrasonicate the solution for 60 minutes, and adjust the pH in the system with Tris-HCl buffer The value is 8.5, adding dopamine, the mass ratio of hexagonal boron nitride and dopamine is 1:0.25, stirring continuously at room temperature for 24h, centrifu...

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Abstract

The invention discloses a dual-modified water-borne epoxy resin anticorrosive coating and a preparation method thereof, and relates to a coating. According to the method, tetraethyl orthosilicate serves as a silicon source, monodisperse nano SiO2 with the surface containing a large number of hydroxyl groups is obtained, and the monodisperse nano SiO2 reacts with a silane coupling agent KH550 to obtain aminated nano SiO2; dopamine is subjected to self-polymerization on the surface of hexagonal boron nitride, and polydopamine modified hexagonal boron nitride is obtained; then, the aminated nano SiO2 and polydopamine are used for modifying hexagonal boron nitride, and a modified SiO2 loaded hexagonal boron nitride composite material is obtained; and finally, the nano SiO2 / hexagonal boron nitride double-modified waterborne epoxy resin coating is prepared by stirring the epoxy resin, the modified SiO2-loaded hexagonal boron nitride, a waterborne curing agent, a waterborne dispersing agent, a waterborne leveling agent, a waterborne defoaming agent and other auxiliaries at a high speed. According to the epoxy coating prepared by the invention, the adhesive force and the mechanical property of a coating on a metal surface are enhanced, so that the coating has excellent corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of water-based epoxy resin anticorrosion coatings, specifically nano-SiO 2 / Hexagonal boron nitride double modified waterborne epoxy resin anticorrosion coating and its preparation method. Background technique [0002] Metal corrosion is going on all the time, covering all areas of life. The amount of corrosion scrapped steel in my country accounts for a large proportion of the annual output, which not only brings huge losses to the national economy, but also causes more serious indirect losses and harm. Such as bridge collapse, oil pipeline cracking and so on. In recent years, many technologies have been used to protect metals from corrosion, commonly used methods are corrosion inhibitors, cathodic and anodic protection, coating protection and reasonable selection of materials, etc. Among them, coating protection is generally considered to be the most economical and effective anti-corrosion technology. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/02C09D5/08C09D7/20
CPCC09D163/00C09D5/08C09D7/20C08K2003/385C08K9/12C08K3/38C08K9/08
Inventor 杨建军刘雷吴庆云吴明元张建安刘久逸
Owner ANHUI UNIVERSITY
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