Method for preparing sulfur-free expansible graphite

A technology of expanded graphite and graphite, applied in the field of composite material preparation, can solve the problems of high sulfur content and low sulfur, and achieve the effects of simple reaction, high yield and low cost

Inactive Publication Date: 2017-05-24
上海驭扬投资有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method of sulfur-free expandable graphite, which is aimed at the problem of high or low sulfur content in the method for preparing expandable graphite in the prior art, and proposes a method of combining graphite with acid Novel Preparation Method for Reaction to Produce Sulfur-Free Expandable Graphite

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  • Method for preparing sulfur-free expansible graphite
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  • Method for preparing sulfur-free expansible graphite

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[0017] The invention provides a method for preparing sulfur-free expandable graphite, the method comprising the following steps:

[0018] (1) Graphite and acid are carried out contact reaction, obtain mixture;

[0019] (2) carrying out the first expansion reaction to the mixture obtained through step (1), to obtain the first expanded graphite;

[0020] (3) performing a second expansion reaction on the first expanded graphite obtained in step (2).

[0021] Preferably, in the present invention, the graphite is natural phosphorus flake graphite, and the carbon content of the graphite is greater than or equal to 99.6% by weight (that is, ≥99.6% by weight), and the average particle size of the graphite is preferably 100- 350 mesh.

[0022] According to the present invention, the inventors of the present invention have found through a large number of scientific experiments that sulfur-free expandable graphite can be prepared by contacting graphite with acid.

[0023] Preferably, ...

Embodiment 1

[0044] (1) Mix the natural flake graphite (carbon content ≥ 99.99% by weight) with an average particle size of 325 meshes and perchloric acid with a concentration of 72% by weight, and put it into a reactor for contact reaction, wherein the natural flake graphite (a total of 15g) and perchloric acid are used in a weight ratio of 1:0.5; and the conditions for the contact reaction include: the reaction temperature is 38°C, and the duration is 40min;

[0045] (2) performing a first expansion reaction on the mixture obtained in step (1) under anaerobic conditions, the conditions of the first expansion reaction include: the temperature is 280° C., and the time is 40 minutes;

[0046] (3) After the first expanded graphite obtained in step (2) is cooled to room temperature, catalyst DGG is added therein to carry out the second expansion reaction; relative to the described graphite of 1 weight part, the consumption of the catalyst is 0.3 weight parts, and the conditions of the second ...

Embodiment 2

[0051](1) Mix the natural flake graphite (carbon content ≥ 99.98% by weight) with an average particle size of 325 meshes and perchloric acid with a concentration of 75% by weight, and put it into a reactor for contact reaction, wherein the natural flake graphite (a total of 15g) and perchloric acid are used in a weight ratio of 1:0.7; and the conditions for carrying out the contact reaction include: the reaction temperature is 40°C, and the duration is 42min;

[0052] (2) The mixture obtained in step (1) is subjected to a first expansion reaction under anaerobic conditions, the conditions of the first expansion reaction include: the temperature is 300° C., and the time is 44 minutes;

[0053] (3) After the first expanded graphite obtained in step (2) is cooled to room temperature, catalyst DGG is added therein to carry out the second expansion reaction; relative to the described graphite of 1 weight part, the consumption of the catalyst is 0.2 weight parts, and the conditions ...

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Abstract

The invention belongs to the field of preparation of functional materials and discloses a method for preparing sulfur-free expansible graphite. The method comprises the following steps: (1) subjecting graphite to a contact reaction with acid so as to obtain a mixture; (2) carrying out a first expansion reaction on the mixture obtained in the step (1) so as to obtain first expansible graphite; and (3) carrying out a second expansion reaction on the first expansible graphite obtained in the step (2). By adopting the method disclosed by the invention, the sulfur-free expansible graphite which is free of sulfur and high in expanded ratio can be prepared; and the reaction is simple, the yield is high, the cost is low, no pollution is caused, and the operation is easy, so that large-scale production can be carried out.

Description

technical field [0001] The invention belongs to the field of preparation of composite materials on the atomic and molecular scale, that is, to the field of material technology. The invention relates to a method for preparing sulfur-free expandable graphite. Specifically, the invention relates to a method for reacting graphite with acid to thereby A novel preparation method for the preparation of sulfur-free expandable graphite. Background technique [0002] Expandable Graphite (Expansible Graphite) is a new type of composite material at the atomic and molecular scale that presents unique physical and chemical properties. Expandable Graphite is also an excellent sealing material and has been widely used in petroleum, chemical, metallurgy, machinery, atomic energy, Thermal power and other industries enjoy the reputation of "King of Sealing". [0003] Because it maintains the thermal conductivity and electrical conductivity of graphite, it has also been widely used in electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/225
Inventor 李青春
Owner 上海驭扬投资有限公司
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