Preparing method of expanded graphite composite wrapped by crosslinking carbon fibers

A technology of expanded graphite and composite materials, applied in carbon compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of low specific surface area of ​​expanded graphite, and achieve the effect of improving overall performance, good electrical conductivity and mechanical properties

Inactive Publication Date: 2017-03-22
HEILONGJIANG HEIKE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problem of low specific surface area of ​​existing expanded graphite, and provides a preparation method of cross-linked carbon fiber-coated expanded graphite composite material

Method used

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  • Preparing method of expanded graphite composite wrapped by crosslinking carbon fibers
  • Preparing method of expanded graphite composite wrapped by crosslinking carbon fibers
  • Preparing method of expanded graphite composite wrapped by crosslinking carbon fibers

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specific Embodiment approach 1

[0017] Embodiment one: the preparation method of the crosslinked carbon fiber coated expanded graphite composite material of the present invention is carried out according to the following steps:

[0018] 1. Mix flake graphite, oxidant and intercalation agent evenly, and stir the reaction for 40-90 minutes at a temperature of 20-60°C to complete the oxidation intercalation reaction, and then add an appropriate amount of H 2 o 2 Reducing the excess oxidant, then filtering out the solid phase, washing with water until neutral, drying to obtain expandable graphite; subjecting the expandable graphite to microwave expansion treatment to obtain expanded graphite (EG);

[0019] Two, cetyltrimethylammonium bromide (CTAB) is dissolved in hydrochloric acid aqueous solution, then add the expanded graphite that step 1 makes, stir, obtain mixed solution A; Under magnetic stirring condition, ammonium persulfate ( APS) was added to the mixed solution A, and continued to stir until uniform t...

specific Embodiment approach 2

[0021] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the particle size range of the flake graphite in step 1 is 45-75 μm. Others are the same as in the first embodiment.

[0022] Specific embodiment two: this embodiment is different from specific embodiment one or two: the oxidizing agent described in step one is potassium permanganate (KMnO 4 ), potassium dichromate (K 2 Cr 2 o 7 ) or potassium perchlorate (KClO 4 ). Others are the same as in the first or second embodiment.

specific Embodiment approach 4

[0023] Specific embodiment four: this embodiment is different from one of specific embodiments one to three: the intercalation agent described in step one is concentrated sulfuric acid (H 2 SO 4 ), perchloric acid (HClO 4 ), phosphoric acid (H 3 PO 4 ), glacial acetic acid (C 2 h 4 o 2 ) or acetic anhydride (C 4 h 6 o 3 ). Others are the same as those in the first to third specific embodiments.

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Abstract

The invention provides a preparing method of an expanded graphite composite wrapped by crosslinking carbon fibers and relates to a preparing method of an expanded graphite composite. The invention aims at solving the technical problem that the specific surface area of the existing expanded graphite is small. The preparing method comprises the following steps: 1, using flake graphite to prepare expanded graphite; 2, dissolving hexadecyl trimethyl ammonium bromide in a hydrochloric acid solution, then adding the expanded graphite, then dripping pyrrole monomers, and carrying out polymerizing reaction while stirring so as to obtain a polypyrrole and expanded graphite composite; and 3, placing the polypyrrole and expanded graphite composite in an atmosphere tubular furnace to carry out carbonization reaction and obtain the expanded graphite composite wrapped by the crosslinking carbon fibers. The composite is of a multi-stage spatial structure, and the specific surface area reaches 170m<2> / g to 480m<2> / g. The composite can be used for the industries of gas sensitive materials, hydrogen storage materials and catalyst carriers or electrode materials.

Description

technical field [0001] The invention belongs to the field of carbon material preparation; in particular, it relates to a preparation method of a cross-linked carbon fiber-coated expanded graphite composite material. Background technique [0002] carbon atom sp 2 Hybridization-dominated graphite-like materials are called carbon materials. Common carbon materials include carbon nanotubes, carbon fibers, graphene, expanded graphite (EG), porous carbon, and composite carbon materials. Carbon materials have the advantages of low price and simple preparation process, and are very suitable for industrialization. [0003] Expanded graphite is made from natural flake graphite through a series of processes such as intercalation, washing, drying, and expansion. EG presents a three-dimensional porous worm-like structure, and the distribution of interlayer spacing ranges from nanometers to micrometers. The van der Waals force on the surface of the graphite sheet of EG can produce phy...

Claims

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Application Information

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IPC IPC(8): C01B32/225
CPCC01P2004/03C01P2006/12
Inventor 张伟君张晓臣魏剑那宏壮刘洪成
Owner HEILONGJIANG HEIKE TECH CO LTD
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