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Folding preventing less-layer graphene powder, components of composite material thereof, and application

A technology of few-layer graphene and composite materials, which is applied in the direction of graphene, conductive coatings, nano-carbon, etc., can solve problems such as difficult to prevent graphene from secondary folding back, and achieve the goal of avoiding flying dust, reducing cleavage time, and easy peeling Effect

Active Publication Date: 2013-04-10
SUPERCDONGGUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Known technologies are difficult to prevent the secondary collapse of graphene
As a result, although the thin layer has been peeled off and cleaved in the solution, it will be folded back again after the drying step, causing the properties of graphene to return to the original graphite properties.

Method used

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  • Folding preventing less-layer graphene powder, components of composite material thereof, and application
  • Folding preventing less-layer graphene powder, components of composite material thereof, and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of preparation method of anti-backfolding few-layer graphene powder is carried out according to the following steps:

[0032] (1) Take 500g of natural graphite (100mesh) and add it to a mixed solution of 1500g of concentrated sulfuric acid and fuming nitric acid, add 750g of potassium chlorate to the solution at 5°C, and keep stirring for 96 hours. The mixture was filtered with filter paper and the residue was washed with 5wt% hydrochloric acid until no sulfate was detected, and then the residue was washed with deionized water until the pH was 6. The residue was dried in an oven at 70°C for 48 hours to obtain intercalated graphite.

[0033] (2) Put the intercalated graphite prepared in step (1) into a muffle furnace with nitrogen gas, set the temperature at 1050°C, and heat for 2 minutes to obtain expanded graphite;

[0034] (3) Add 90g of polyethylene oxide to 5610g of water in parts by weight, and stir evenly to make a mixed solution;

[0035] (4) adding the ...

Embodiment 2

[0039] A kind of preparation method of anti-backfolding few-layer graphene powder is carried out according to the following steps:

[0040] (1) Take 100g of natural graphite (100mesh) and add it to a mixed solution of 300g of concentrated sulfuric acid and fuming nitric acid, add 150g of potassium chlorate to the solution at 5°C, and keep stirring for 96 hours. The mixture was filtered with filter paper and the residue was washed with 5wt% hydrochloric acid until no sulfate was detected, and then the residue was washed with deionized water until the pH was 7. The residue was dried in an oven at 70°C for 48 hours to obtain intercalated graphite.

[0041] (2) Put the intercalated graphite prepared in step (1) into a muffle furnace with nitrogen gas, set the temperature at 1050°C, and heat for 2 minutes to obtain expanded graphite;

[0042](3) Add 1.5g of polyethylene glycol to 93.5g of water in parts by weight, and stir evenly to make a mixed solution;

[0043] (4) adding the ...

Embodiment 3

[0047] A kind of preparation method of anti-backfolding few-layer graphene powder is carried out according to the following steps:

[0048] (1) Take 70g of natural graphite (100mesh) and add it to a mixed solution of 210g of concentrated sulfuric acid and fuming nitric acid, add 90g of potassium chlorate to the solution at 10°C, and keep stirring for 96 hours. The mixture was filtered with filter paper and the residue was washed with 5wt% hydrochloric acid until no sulfate was detected, and then the residue was washed with deionized water until the pH was 6. The residue was dried in an oven at 70°C for 48 hours to obtain intercalated graphite.

[0049] (2) Put the intercalated graphite prepared in step (1) into a muffle furnace with nitrogen gas, set the temperature at 1050°C, and heat for 2 minutes to obtain expanded graphite;

[0050] (3) Add 10g of polyvinyl alcohol into 519g of water in parts by weight, stir evenly, then add 5g of sodium dodecylsulfonate and 1g of defoame...

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Abstract

The invention discloses folding preventing less-layer graphene powder, components of composite material thereof and application, and belongs to the technical field of graphene preparation. The folding preventing less-layer graphene powder can be applied to conductive plastics, conductive coating paint and printing ink, and can also be applied to mechanical enhancement of conductive adhesive and various and various resins. In addition, the graphene powder can also be applied to the preparation of electrodes of lithium batteries and supercapacitors, composite material requiring high thermal diffusivity, and any other material requiring good electric conductivity, thermal conductivity and mechanical enhancement. The graphene powder has the characteristics that special dispersant is utilized to prepare graphene solution, and secondary folding of graphene piece layers is effectively prevented during the drying process, so that thinner less-layer graphene powder is obtained, and excellent electric conductivity, mechanical property and thermal conductivity can be obtained in polymer or other base material through lower additive amount.

Description

technical field [0001] The invention belongs to the technical field of graphene preparation, and in particular relates to the composition and preparation of anti-backlapping few-layer graphene powder and composite materials thereof. Background technique [0002] Since the advent of graphene in 2004, it has received extensive attention due to its excellent electrical, mechanical and thermal properties. The unique physical properties of graphene determine its wide application space. Very high Young's modulus, thermal conductivity up to 5000W / mK, theoretical specific surface area up to 2630m 2 / g, and the energy gap is adjustable, the single layer is almost completely transparent, absorbing only 2.3% of light. In the near future, graphene may produce a new generation of electronic components that are thinner and conduct electricity faster. Moreover, due to the good light transmission and conductivity of graphene, it is also suitable to replace ITO to make transparent touch s...

Claims

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Application Information

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IPC IPC(8): C01B31/04C08K3/04C09D5/24C01B32/19
Inventor 李琦何斌郑鑫强蔡庆荣
Owner SUPERCDONGGUAN TECH
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