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Method for preparing graphite at ultra-low temperature

A technology of expanded graphite and ultra-low temperature, which is applied in the field of expanded graphite, can solve the problems of restricting the large-scale production of expanded graphite and high heat treatment temperature, and achieve the effect of reducing production cost and improving production efficiency

Inactive Publication Date: 2016-03-23
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The heat treatment temperature of this process is relatively high, generally at 120-1100°C, which restricts the large-scale production of expanded graphite to a certain extent.

Method used

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  • Method for preparing graphite at ultra-low temperature
  • Method for preparing graphite at ultra-low temperature
  • Method for preparing graphite at ultra-low temperature

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Effect test

Embodiment 1

[0023] The invention discloses a method for preparing expanded graphite at ultra-low temperature. The flake graphite is used as a raw material, and the graphite oxide is obtained by using the Hummers method. Soak the wet (undried) graphite oxide in an aqueous solution of sulfuric acid (concentration 3%) to acidify, separate the acidified graphite oxide from the acid solution, and place the wet and acidified graphite oxide at 70°C The preliminary product is directly obtained after heat treatment under the ultra-low temperature condition, and the expanded graphite is obtained after washing and purification.

Embodiment 2

[0025] The invention discloses a method for preparing expanded graphite at ultra-low temperature. Artificial graphite is used as a raw material to obtain graphite oxide by Hummers method. Soak the wet (undried) graphite oxide in an aqueous solution of sulfuric acid (50% concentration) for acidification, separate the acidified graphite oxide from the acid solution, and place the wet and acidified graphite oxide at 50°C The preliminary product is directly obtained after heat treatment under the ultra-low temperature condition, and the expanded graphite is obtained after washing and purification.

Embodiment 3

[0027] The invention discloses a method for preparing expanded graphite at ultra-low temperature, using natural graphite as a raw material, and obtaining graphite oxide by Hummers method. Soak wet (undried) graphite oxide in an aqueous solution of perchloric acid (concentration 10%) to carry out acidification treatment, separate acidified graphite oxide from the acid solution, and wet and acidified graphite oxide in The primary product is directly obtained after heat treatment at an ultra-low temperature of 110°C, and expanded graphite is obtained after washing and purification.

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Abstract

The invention relates to a method for preparing graphite at ultra-low temperature, and belongs to the technical field of expanded graphite. The method for preparing the expanded graphite at the ultra-low temperature is characterized in that a technical process for preparing the expanded graphite at the ultra-low temperature comprises the steps of soaking wet graphite oxide in an aqueous solution of non-volatile acid, and performing acid treatment; separating acidulated graphite oxide from an acid solution; performing heat treatment on the wet and acidulated graphite oxide under the ultra-low temperature of 50 to 110 DEG C to directly obtain a preliminary product, washing, and purifying to obtain the expended graphite. The method provided by the invention has the advantages that the process is simple, the operation is convenient, the production cost is lowered while the production efficiency is improved, and the like, and the method is extremely suitable for large scale production of the expanded graphite.

Description

technical field [0001] The invention belongs to the technical field of expanded graphite, in particular to a method for preparing expanded graphite at ultra-low temperature. Background technique [0002] At present, the graphite raw material has a layered structure, and the bonding force between layers is very weak, only about 17KJ / mol. The gap between the carbon atom layers of graphite is easy to insert alkali metals with small ionization energy and halogens, halides and acids with high electron affinity, thereby forming graphite intercalation compounds (GICs). GICs are placed at high temperatures, and the graphite layer The instantaneous vaporization of the intercalation generates thrust, pushes the graphite layers apart, and expands macroscopically, and the expandable graphite becomes expanded graphite. [0003] Expanded graphite is a loose and porous worm-like substance made from natural flake graphite through intercalation treatment, water washing, drying, and high-tem...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCC01P2002/72C01P2004/03C01P2006/12
Inventor 宗军刁玉琦刘兴江丁飞许寒任丽彬
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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