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Quaternized lignin dispersed graphene/carbon nano-tube compound anticorrosion coating, preparation method thereof and application of coating

A technology of carbon nanotubes and dispersed graphite, used in anti-corrosion coatings, coatings, epoxy resin coatings, etc., can solve the problems of water-based materials being difficult to disperse, restricting applications, etc., to reduce corrosion paths, delay corrosion rates, and operability. strong effect

Active Publication Date: 2019-04-05
NANXIONG MATERIAL PRODION BASE OF CHINESE ACADEMY OF SCI GUANGZHOU CHEM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the high specific surface area and strong van der Waals force, graphene sheets and carbon nanotubes are easy to aggregate together. In addition, these carbon nanomaterials are more difficult to disperse in aqueous materials due to their hydrophobicity. Application of water-based resin composite materials

Method used

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  • Quaternized lignin dispersed graphene/carbon nano-tube compound anticorrosion coating, preparation method thereof and application of coating
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  • Quaternized lignin dispersed graphene/carbon nano-tube compound anticorrosion coating, preparation method thereof and application of coating

Examples

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Effect test

Embodiment 1

[0059] This example provides a method for preparing a quaternized lignin-dispersed graphene / carbon nanotube-based composite anticorrosion coating.

[0060] (1) Purify and dry alkali lignin before use, add sodium hydroxide solid to 45ml deionized water to obtain a 20wt.% sodium hydroxide solution, then add alkali lignin to obtain sodium hydroxide with a concentration of 0.16g / mL The dissolved alkali lignin solution was ultrasonically dispersed for 15 minutes. According to the ratio of mass ratio alkali lignin: 3-chloro-2-hydroxypropyltrimethylammonium chloride solution=1:0.83, the 3-chloro-2-hydroxypropyltrimethylammonium chloride solution (60wt .%) was added dropwise to the above-mentioned lignin alkali solution, stirred and reacted at 85°C for 4h, after the reaction was completed, cooled to room temperature to obtain a reaction solution, which was purified by dialysis with a 1000 molecular weight dialysis bag, and the reaction after dialysis The solution was dried with a fre...

Embodiment 2

[0065] This example provides the application of the quaternized lignin-dispersed graphene / carbon nanotube-based composite anticorrosion coating prepared in Example 1 and its comparative example.

[0066] (1) Preparation of waterborne epoxy coating (WEP):

[0067] Mix 4.25 parts by mass of water-based curing agent DY-175, 1 part by mass of deionized water and 5 parts by mass of water-based epoxy resin DY-128-50 at room temperature with mechanical stirring, and ultrasonically disperse in an ultrasonic cleaner at 20KHz For 10 minutes, under the condition of ice bath in a vacuum oven, vacuum out the air bubbles; after the air bubbles are completely removed, use a spin coater to coat a 25 μm thick coating on Q235 carbon steel. Curing at room temperature for 5 hours to obtain a waterborne epoxy coating.

[0068] (2) Preparation of graphene-based composite anticorrosion coatings dispersed in quaternized lignin:

[0069] Dissolve the quaternized lignin in water to obtain a quaterniz...

Embodiment 3

[0076] This example provides a method for preparing a graphene / carbon nanotube-based composite anticorrosion coating dispersed in quaternized lignin.

[0077] (1) Purify and dry the high boiling alcohol lignin before use, add solid sodium hydroxide to 45ml deionized water to obtain a 20wt.% sodium hydroxide solution, then add high boiling alcohol lignin to obtain a concentration of 0.16g / mL High-boiling alcohol lignin solution dissolved in sodium hydroxide, ultrasonically dispersed for 15 minutes. According to the ratio of mass ratio high boiling alcohol lignin: 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution=1:0.83, the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution (60wt.%) was added dropwise in the above-mentioned lignin alkali solution, stirred and reacted at 85°C for 4h, after the reaction was completed, cooled to room temperature to obtain a reaction solution, the reaction solution was purified by dialysis with a 800 molecular weight dialysis...

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Abstract

The invention belongs to the technical field of metal anticorrosion coating preparation, and particularly relates to a quaternized lignin / graphene / carbon nano-tube compound anticorrosion coating, a preparation method thereof and an application of the coating. According to the method, quaternized lignin graphene / carbon nano-tube dispersion liquid is prepared by ultrasonic peeing dispersion, and thedispersion liquid, waterborne epoxy resin and waterborne curing agents are mixed to prepare the quaternized lignin dispersed graphene / carbon nano-tube compound waterborne anticorrosion coating. According to the method, by the aid of renewable biomass material lignin, quaternization and amphipathy of the lignin and pi-pi action between the lignin and graphene, hydrophobic graphene and carbon nano-tubes can be uniformly dispersed in the waterborne epoxy resin, the graphene in the coating can prevent corrosive small molecules from entering in a layer-by-layer manner, and corrosion of a substrateis delayed. The carbon nano-tubes are added, the carbon nano-tubes and the graphene have a synergetic anticorrosion function, and the coating can be used for anticorrosion of surfaces of metal and building materials and shows good capacitive reactance arc.

Description

technical field [0001] The invention belongs to the technical field of preparation of metal anticorrosion coatings, and in particular relates to a quaternized lignin / graphene / carbon nanotube-based composite anticorrosion coating and a preparation method and application thereof. Background technique [0002] With the increasingly prominent energy and environmental issues, it has become a trend to replace fossil energy materials with renewable biomass materials. As a renewable biomass material, lignin is second only to cellulose in content. As a by-product of papermaking waste liquid, lignin is often overlooked, and the use of lignin to prepare high value-added materials has become a research hotspot. [0003] Over the years, the loss of people and property due to corrosion has been increasing. Graphene has good barrier properties due to its unique two-dimensional structure. Carbon nanotubes, as a one-dimensional carbon nanomaterial, are comparable to graphite Combining viny...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/08C09D7/65C09D7/61
CPCC08K2201/011C09D5/08C09D163/00C09D7/61C09D7/65C08L97/005C08K3/041C08K3/042
Inventor 吕满庚王善胡卓荣谭智友史珺吴昆
Owner NANXIONG MATERIAL PRODION BASE OF CHINESE ACADEMY OF SCI GUANGZHOU CHEM
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