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Graphene and preparation method thereof

A technology of graphene and graphite, which is applied in the field of graphene with good water dispersibility and its preparation, can solve the problems of destroying graphene structure, poor compatibility of graphene, and poor dispersion of graphene, so as to expand the application range and process Effects of less emission and ease of industrialization

Active Publication Date: 2019-12-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oxidation of graphene by strong acids and strong oxidants not only destroys the structure of graphene, but also reduces its performance.
In addition, due to the poor water dispersibility of graphene, graphene cannot be uniformly dispersed in other materials, such as coatings, plastics, resins, rubber, etc., which greatly limits the application of graphene.
[0004] Therefore, in view of the poor dispersibility of graphene in the method for preparing graphene in the prior art, and the poor compatibility of graphene and other materials obtained, the development of a new method for preparing graphene remains to be further studied, and the present invention is proposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] According to the present invention, the preparation method of described graphene comprises the following steps:

[0023] (1) In the presence of ammonia or ammonium salt, graphite is contacted with an intercalation agent to obtain a graphite intercalation compound;

[0024] (2) contacting the graphite intercalation compound obtained in step (1) with an oxidizing agent to oxidize the intercalation agent in the graphite intercalation compound while realizing interlayer exfoliation of the graphite intercalation compound;

[0025] (3) reclaiming the product obtained in step (2) to obtain graphene powder.

[0026] The layered structure of graphite makes there are certain gaps between layers, so under certain conditions, atoms (or molecules) of certain reactants (such as acids, alkalis, halogens, etc.) can enter the interlayer gap and form a carbon network. Intercalation compounds or intercalation compounds. In the preparation method of graphene of the present invention, in ...

Embodiment 1

[0050] This embodiment is used to illustrate the method for preparing graphene provided by the present invention.

[0051] (1) At a stirring rate of 300 rev / min, the natural flake graphite, liquid ammonia and elemental sulfur with an average particle size of 325 mesh carbon content≥99.99% are mixed in the reactor, wherein the weight ratio of graphite to liquid ammonia is The weight ratio of graphite to elemental sulfur is 1:0.1, and the weight ratio of graphite to elemental sulfur is 1:10, and the contact temperature is 120°C for 12 hours.

[0052] (2) Pass into ozone (ozone volume concentration is 50%, all the other are oxygen) in reaction kettle, be that 60 ℃ of contacting obtain graphene nanosheet for 5 hours at reaction temperature, wherein, the feed amount of ozone is to make intercalation 5 times the theoretical amount used for agent decomposition.

[0053] (3) The obtained graphene nanosheets are washed and prepared into a graphene aqueous dispersion with a content of ...

Embodiment 2

[0055] This embodiment is used to illustrate the method for preparing graphene provided by the present invention.

[0056] Graphene was prepared according to the method of Example 1, except that in step (1), liquid ammonia was replaced by an equivalent amount of ammonium nitrate.

[0057]The graphene nano-powder prepared in this embodiment is prepared into a graphene aqueous dispersion with a content of 0.1 weight ‰, and after standing for 1 hour, at 25°C, measure the prepared graphene aqueous dispersion. Absorbance at the bottom and the bottom, respectively recorded as S1, S2, S3, measured 5 times, the absolute value of the difference between S1 or S2 or S3 and the average value of S1, S2, S3 in this measurement is RS1, RS2, RS3. The percentages of the ratios of RS1, RS2, and RS3 to the average values ​​of S1, S2, and S3 in this measurement were 1.11% for DS1, 1.75% for DS2, and 2.58% for DS3. After resting for another 12 hours, it was measured 5 times, and the ranges of DS1...

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Abstract

The invention relates to the field of functional materials, and discloses graphene and a preparation method thereof. The graphene is prepared into a graphene aqueous dispersion liquid with the contentof 0.01-0.1 wt%, and the graphene aqueous dispersion liquid is left to stand for 1 h; under the same temperature, the absorbance of the upper part, the middle part and the bottom of the same volume of the graphene aqueous dispersion are measured respectively; it is shown by results that the relative deviation of the absorbance of the graphene aqueous dispersion at the upper part, the middle partand the bottom part is 10% or lower, preferable is less than or equal to 5%; and after standing for 12 hours, the relative deviation of the absorbance of the graphene aqueous dispersion at the upper part, the middle part and the bottom part is 20% or lower, preferable is less than or equal to 10%. The graphene provided by the invention can be stably dispersed in water and has good dispersibility in water, so that the problem of poor compatibility with other materials due to inherent hydrophobicity of carbon materials is solved to a certain extent, and the application range of the graphene in the other materials is expanded.

Description

technical field [0001] The invention relates to a graphene and a preparation method thereof, in particular to a graphene with good water dispersibility and a preparation method thereof. Background technique [0002] The unique two-dimensional structure of graphene makes it possible to be as high as 2600cm 2 / g specific surface area, high Young's modulus and carrier mobility, as well as excellent electrical conductivity, thermal conductivity, mechanical properties and light transmittance. Among known materials, graphene is the strongest substance known to man, more than 100 times stronger than steel. Graphene is also an additive to nanocomposites. With the continuous deepening of research on graphene, the scope of its application continues to expand, making the preparation of graphene a very important research topic. [0003] However, due to the inherent hydrophobicity of carbon materials, the graphene produced by the prior art is difficult to fully disperse in water, and ...

Claims

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Application Information

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IPC IPC(8): C01B32/19C01B32/225
CPCC01B32/19C01B32/225
Inventor 史春风欧恩才徐伟箭张晓燕鲍琳
Owner CHINA PETROLEUM & CHEM CORP