Method for preparing high-strength conductive graphene fiber by large-size graphene oxide sheet

A technology of graphene sheet and conductive graphite, which is applied in the direction of graphene, fiber chemical characteristics, rayon chemical post-treatment, etc., can solve the problems of uneven size of graphene oxide, affecting the performance of graphene materials, etc., and achieves simple and good operation. Strength and toughness, the effect of a wide range of raw material sources

Active Publication Date: 2012-07-04
杭州德烯科技集团有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the graphene oxide prepared by this "top-to-bottom" preparation method has the disadvantage of non-uniform size, which affects the performance of the final graphene material

Method used

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Examples

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preparation example Construction

[0018] The preparation method of high-strength macro graphene conductive fiber of the present invention comprises the following steps:

[0019] 1. Mix 1 part by weight of expanded graphite raw material, 1-100 parts by weight of sulfuric acid, 0.5-5 parts by weight of potassium persulfate and 0.5-5 parts by weight of phosphorus pentoxide, and stir and react at 25-100 °C for 1-10 hours , after cooling to room temperature, dilute with deionized water, filter with filter membrane, wash with deionized water until neutral, and dry naturally for 10-50 hours to obtain intercalated graphite.

[0020] The particle size of the expanded graphite is 100-500 microns, and the sulfuric acid is sulfuric acid with a mass concentration greater than 80%.

[0021] 2. Mix 1 part by weight of the intercalated graphite obtained in step 1, 1~100 parts by weight of sulfuric acid and 0.5~10 parts by weight of potassium permanganate, stir and react at -10~50°C for 0.1~10 hours, then add 10 ~2000 parts b...

Embodiment 1

[0035] Step (a): Add 10g of expanded graphite, 10g of 90% sulfuric acid, 1g of potassium persulfate and 1g of phosphorus pentoxide into the reaction flask, stir and react at 80°C for 5 hours, cool to room temperature, and use deionized Dilute with water, filter with filter membrane, wash the filter cake repeatedly with deionized water until neutral, dry naturally for 10 hours to obtain intercalated graphite;

[0036] Step (b): Add 5g of the intercalated graphite product obtained in step (a), 20g of 80% sulfuric acid and 2.5g of potassium permanganate to the reaction bottle, stir and react at 50°C for 2 hours, then add 1kg of deionized Water and 0.5g of 30% hydrogen peroxide were stirred for 10 hours, filtered through a filter membrane, and the filter cake was repeatedly washed with deionized water to neutrality, and dried naturally to obtain preliminary graphite oxide;

[0037] Step (c): Add 2g of the preliminary graphite oxide product obtained in step (b), 20g of 90% sulfuric...

Embodiment 2

[0044] Step (a): Add 10g of expanded graphite, 100g of 90% sulfuric acid, 50g of potassium persulfate and 50g of phosphorus pentoxide into the reaction flask, stir and react at 80°C for 5 hours, cool to room temperature, and use Dilute with deionized water, filter with filter membrane, wash the filter cake repeatedly with deionized water until neutral, dry naturally for 10 hours to obtain intercalated graphite;

[0045] Step (b): Add 5g of the intercalated graphite product obtained in step (a), 300g of 90% sulfuric acid and 50g of potassium permanganate into the reaction bottle, stir and react at 50°C for 2 hours, then add 1kg of deionized water Stir with 30% hydrogen peroxide of 30g for 10 hours, filter with filter membrane, wash the filter cake repeatedly with deionized water to neutrality, and dry naturally to obtain preliminary graphite oxide;

[0046] Step (c): Add 2g of the preliminary graphite oxide product obtained in step (b), 300g of 90% sulfuric acid, 20g of potassi...

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Abstract

The invention discloses a method for preparing high-strength conductive graphene fiber by a large-size graphene oxide sheet. The method comprises the steps of: oxidizing expanded graphite and obtaining graphene oxide; dispersing the graphene oxide into water, carrying out centrifugal classification treatment on the dispersed graphene oxide, and obtaining the large-size even graphene oxide sheet; and finally, dispersing the graphene oxide into water or polar organic solvent, preparing spinning solution liquid crystal sol with the mass concentration of 1-20%, transferring the spinning solution liquid crystal sol into a spinning device, continuously squeezing spinning solution out from a spinning head capillary tube at the uniform velocity, leading the squeezed spinning solution into solidification liquid, drying the solidified primary fiber, obtaining graphene oxide fiber, and then obtaining the graphene fiber by chemical reduction. A spinning technology is simple; and the obtained graphene fiber is good in electrical conductivity, excellent in mechanical property and better in toughness, can be woven into pure-graphene fiber cloth, and also can be woven with other fibers in a blending way so as to make various functional fabrics, so that the high-strength conductive graphene fiber can be used for replacing carbon fiber in a plurality of fields.

Description

technical field [0001] The invention relates to a graphene fiber, in particular to a method for preparing a high-strength conductive graphene fiber from a large-sized graphene oxide sheet. Background technique [0002] Graphene is a new class of carbon two-dimensional nanomaterials, discovered in 2004 (Science, 2004, 306 , 666-669). A large number of research results show that graphene has the highest strength of known materials, large specific surface area ratio, excellent electrical conductivity and thermal conductivity and other excellent properties. These excellent properties also determine that it has broad application prospects in many fields such as composite materials, electronic devices, and solar energy. On the road to graphene macroscopic materials, starting from graphite to prepare graphene oxide and then obtaining graphene through chemical reduction has become a simple, effective and mass-produced method of graphene. However, the graphene oxide prepared by th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/12D01F11/14D01F11/12C01B31/04C01B32/19
Inventor 高超许震
Owner 杭州德烯科技集团有限公司
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