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Room-temperature one-step type preparation method of expanded graphite

A technology of expanded graphite and room temperature, which is applied in the field of materials and can solve problems such as time-consuming and energy-consuming

Inactive Publication Date: 2018-08-24
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the time-consuming and energy-consuming shortage of the current preparation method of expanded graphite, and provide a method for preparing expanded graphite in one step at room temperature that is simple, feasible, low-cost, energy-saving, high-efficiency, and environmentally friendly

Method used

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  • Room-temperature one-step type preparation method of expanded graphite
  • Room-temperature one-step type preparation method of expanded graphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Mix 9mL of concentrated sulfuric acid with a concentration of 98% and 3g of sodium perborate through stirring to make a mixed solution; then add 1g of natural flake graphite with a particle size of 50 meshes to the prepared mixed solution and stir for 30s. After standing still for 4 hours, expanded graphite was obtained, and the calculated expansion volume was 180mL / g.

[0018] Such as figure 1 As shown, it can be seen that the morphology of the original graphite has changed from scaly to worm-like after one-step treatment at room temperature. Such as figure 2 As shown, after one-step treatment at room temperature, the microscopic morphology of pristine graphite also changed significantly, from tightly stacked layers to fluffy and porous shapes.

Embodiment 2

[0020] 1mL of concentrated sulfuric acid with a concentration of 98% and 1g of sodium perborate were thoroughly mixed by stirring to form a mixed solution; Stand at room temperature for 4 hours to obtain expanded graphite, the calculated expansion volume is 10mL / g.

Embodiment 3

[0022] Mix 20mL of concentrated sulfuric acid with a concentration of 98% and 10g of sodium perborate thoroughly by stirring to make a mixed solution; then add 1g of natural flake graphite with a particle size of 50 meshes to the prepared mixed solution and stir for 30s. After standing still for 4 hours, expanded graphite was obtained, and the calculated expansion volume was 330mL / g.

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Abstract

The invention discloses a room-temperature one-step type preparation method of expanded graphite. The method mainly comprises the following steps: fully stirring and uniformly mixing concentrated sulfuric acid and sodium perborate to obtain an uniform mixed solution; adding graphite to the mixed solution on the basis of adding 0.05-1g of graphite to every 1ml of mixed solution; uniformly stirring;and standing for 1-24h under room temperature to obtain the wormlike expanded graphite. According to the method, the expanded graphite preparation process is simplified, and the expanded graphite canbe prepared by one step; little acid is used, and the volume of the used acid is only about 25% of that of the acid used in a traditional method; in addition, the centrifugal water washing process issaved, so that the method is green and environmentally friendly; the expanded graphite can be prepared under room temperature, rather than high temperature or radiation processing.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a preparation method of expanded graphite. Background technique [0002] Expanded graphite is obtained by expanding the graphite interlayer compound. The graphite interlayer compound will expand and become a macroscopic worm-like, porous and loose substance, which can also be called worm graphite. Expanded graphite is a soft, The structure is relatively loose and rich in porous substances. It has a small specific gravity and a high specific surface area, which can reach 50-200m in general 2 / g, based on this, expanded graphite has many excellent performances, such as soft texture, low specific gravity, high porosity, good adsorption performance, and its properties are little affected by temperature changes. It can be used as a heat-resistant material and can withstand -200°C The change of temperature up to 3600 ℃ does not change the properties, the sealing performance is good...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/225
CPCC01B32/225
Inventor 张瑞军吴文玉刘孟杰
Owner YANSHAN UNIV