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Lignin/graphene-based composite anticorrosive coating and preparation method and application thereof

An anti-corrosion coating, graphene-based technology, applied in anti-corrosion coatings, coatings, epoxy resin coatings, etc., can solve the problems of graphene sheets being easy to gather together, difficult to disperse, and limit applications, etc., to achieve both thermal stability Sexuality, low cost, and the effect of delaying the corrosion rate

Active Publication Date: 2018-10-16
中科检测技术服务(重庆)有限公司 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high specific surface area and strong van der Waals force, graphene sheets are easy to aggregate together. In addition, graphene is hydrophobic and more difficult to disperse in water-based materials. These reasons limit its application in water-based resin composites.

Method used

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  • Lignin/graphene-based composite anticorrosive coating and preparation method and application thereof
  • Lignin/graphene-based composite anticorrosive coating and preparation method and application thereof
  • Lignin/graphene-based composite anticorrosive coating and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] This example provides a method for preparing a lignin / graphene-based composite anticorrosion coating.

[0066] (1) Purify and dry the alkali lignin, dissolve it in N,N-dimethylformamide (DMF) to obtain a lignin solution with a concentration of 0.25g / mL, according to the mass ratio of alkali lignin: hydrobromic acid solution =1:5 ratio Mix lignin solution and hydrobromic acid solution (48wt.%), stir at 120°C for 20h, after the reaction is complete, cool to room temperature, dropwise add to 2mol / L HCL solution to precipitate, Centrifuge at 8000 rpm for 30 min to obtain a precipitate, which is washed with water and ether to obtain hydroxylated lignin.

[0067] (2) Dissolving the hydroxylated lignin in water to obtain a lignin dispersion with a solubility of 0.5g / L, adding 1 mass part of natural graphite flakes to 25 mass parts of the lignin dispersion, at 15°C Use an ultrasonic cleaner to sonicate in an ice bath at 20KHz for 6 hours, centrifuge to remove unstable graphite...

Embodiment 2

[0071] This example provides the application of the lignin / graphene-based composite anticorrosion coating prepared in Example 1 and its comparative example.

[0072] (1) Preparation of waterborne epoxy coating (WEP):

[0073] Mix 2.25 parts by mass of water-based curing agent PLR 736, 1 part by mass of isopropanol and 5 parts by mass of epoxy resin at room temperature with mechanical stirring, ultrasonically disperse at 20KHz for 10min in an ultrasonic cleaner, and place in a vacuum oven under ice bath conditions Next, vacuum out the air bubbles; after the air bubbles are completely removed, use a spin coater to coat a 2mm thick coating on Q235 carbon steel. Curing at room temperature for 5 hours to obtain a waterborne epoxy coating.

[0074] (2) Preparation of graphene waterborne epoxy coating (G / WEP):

[0075] Add natural graphite flakes into water, use an ultrasonic cleaning machine at 15°C to ultrasonicate at 20KHz for 6 hours, and centrifuge to remove unstable graphite ...

Embodiment 3

[0079] This example provides a method for preparing a lignin / graphene-based composite anticorrosion coating.

[0080] (1) Sodium lignosulfonate is purified and dried, dissolved in N,N-dimethylformamide (DMF) to obtain a lignin solution with a concentration of 0.2g / mL, according to the mass ratio of sodium lignosulfonate: Hydrobromic acid solution=1:5 ratio Mix lignin solution and hydrobromic acid solution (48wt.%), stir at 150°C for 20h, after the reaction is completed, cool to room temperature, add dropwise to 2mol / L HCL Precipitate in the solution, centrifuge at 8000 rpm for 30 min to obtain a precipitate, wash with water and ether to obtain hydroxylated lignin.

[0081] (2) Dissolving the hydroxylated lignin in water to obtain a lignin dispersion with a solubility of 0.5g / L, adding 1 mass part of natural graphite flakes to 25 mass parts of the lignin dispersion, at 15°C Use an ultrasonic cleaner to sonicate in an ice bath at 20KHz for 6 hours, centrifuge to remove unstable...

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Abstract

The invention belongs to the technical field of preparation of metal anticorrosive coatings, and in particular relates to a lignin / graphene-based composite anticorrosive coating and a preparation method and application of the lignin / graphene-based composite anticorrosive coating. The method comprises the following steps: mixing a hydroxylated lignin solution with graphite, ultrasonically strippingto prepare saturated lignin / graphene dispersion liquid, and then mixing with epoxy resin, a waterborne curing agent and a solvent to prepare the lignin / graphene-based composite anticorrosive coating.The method adopts a renewable biomass material, namely lignin, and the hydroxylation, amphiphilicity of the lignin and the Pi-Pi interaction of the lignin with graphene are used, so that hydrophobicgraphene can be uniformly dispersed in the waterborne epoxy resin to obtain the coating, and the graphene of the coating can block intrusion of small corrosive molecules layer by layer to greatly reduce corrosion paths of the small molecules, so as to delay the corrosion rate of a substrate. Furthermore, the coating further has good thermal stability and shows better capacitance arc and higher pyrolysis temperature while used for anticorrosion of metal and building material surfaces.

Description

technical field [0001] The invention belongs to the technical field of preparation of metal anti-corrosion coatings, and in particular relates to a lignin / graphene-based composite anti-corrosion coating and its preparation method and application. Background technique [0002] Epoxy coatings are widely used in the anticorrosion of automobiles, ships and oil tanks due to their excellent corrosion resistance, chemical resistance, mechanical properties and low shrinkage. In recent decades, the emergence of environmental pollution problems has forced researchers to pay attention to environmentally friendly chemicals. Among them, the use of water-based epoxy resin coatings to replace solvent-based epoxy resin coatings is a key development direction. However, the residual hydrophilic groups or surfactants in waterborne epoxy coatings after curing can form polar channels, which accelerate water absorption and penetration, degrade the coating and cause corrosion. Therefore, waterbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/08C09D7/61C08H7/00
CPCC08H6/00C08L2201/08C09D5/08C09D7/61C09D7/70C09D163/00C08L97/00C08K7/00C08K3/042
Inventor 吕满庚王善胡卓荣史珺吴昆梁利岩
Owner 中科检测技术服务(重庆)有限公司
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