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Graphene preparation method and graphene

A graphene and graphite technology, applied in the field of nanomaterials, can solve the problems of difficult high-quality, low-cost mass production, and low yield, and achieve the effect of overcoming van der Waals force between layers, high quality, and increasing layer spacing

Inactive Publication Date: 2018-05-01
昂星新型碳材料常州有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphene prepared by ultrasonic exfoliation has few defects, but the yield is low
[0004] In summary, the existing graphene preparation methods have their own advantages and disadvantages, and it is difficult for a single process to meet the requirements of high quality, low cost, and mass production at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] A kind of preparation method of graphene, comprises the following steps:

[0070] (a) Weigh 50 g of 100-mesh flake graphite and 1000 g of sodium bisulfite, mix them evenly, put them into a ball mill tank, and use planetary ball milling for 20 hours. After the ball milling is completed, a mixed precursor is obtained;

[0071] (b) Prepare 50L of 3M hydrochloric acid, add 1g of sodium dodecylbenzenesulfonate, and transfer it to a 100L reactor; take out the mixed precursor and slowly add it to a 100L reactor, a large number of bubbles are generated; complete, get Graphene dispersion; after filtration, washing, dilution and dispersion, a 5% graphene dispersion is obtained, and the number of layers of graphene is 5 to 15;

[0072] (c) Get 100g graphene dispersion, add sodium dodecylbenzene sulfonate 5g, stir and disperse evenly, ultrasonic 30min under ultrasonic conditions, power is 300W; After washing, centrifugation, drying, obtain few-layer graphene Powder.

[0073] The ...

Embodiment 2

[0076] A kind of preparation method of graphene, comprises the following steps:

[0077] (a) Weigh 50 g of 325 mesh expanded graphite and 2000 g of sodium carbonate, mix them uniformly, put them into a ball mill tank, adopt horizontal ball mill, ball mill for 48 hours, and after ball milling is completed, a mixed precursor is obtained;

[0078] (b) Prepare 50L of 6M sulfuric acid, add 0.5g of sodium dodecylbenzenesulfonate, and transfer it to a 100L reactor; take out the mixed precursor and slowly add it to a 100L reactor, a large number of bubbles are generated; finish, Obtain a graphene dispersion; after filtering, washing with water, diluting and dispersing, a 5% graphene dispersion is obtained, and the number of graphene layers is 6-20;

[0079] (c) Take 100 g of the graphene dispersion, add 10 g of polyvinylpyrrolidone, stir and disperse evenly, and ultrasonicate for 600 min under ultrasonic conditions with a power of 500 W; after washing with water, centrifuging, and dry...

Embodiment 3

[0082] A kind of preparation method of graphene, comprises the following steps:

[0083] (a) Weigh 50g of 5000-mesh flake graphite and 5000g of sodium carbonate, mix them evenly, put them into a ball mill tank, use planetary ball mill, ball mill for 100h, and after ball milling is completed, a mixed precursor is obtained;

[0084] (b) Prepare 50L of 6M phosphoric acid, add 1g of sodium dodecylbenzenesulfonate, disperse evenly, and transfer it to a 100L reactor; take out the mixed precursor and slowly add it to a 100L reactor, a large number of bubbles are generated; After completion, the dispersion of graphene is obtained; after filtering, washing with water, dilution and dispersion, 5% of the dispersion of graphene is obtained, and the number of graphene layers is 5-12 layers;

[0085] (c) Take 100 g of the graphene dispersion, add 0.5 g of polyvinylpyrrolidone, stir and disperse evenly, and ultrasonicate for 1200 min under ultrasonic conditions with a power of 3000 W; after ...

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Abstract

The invention belongs to the technical field of nanometer materials and relates to a graphene preparation method and graphene. By adopting the graphene preparation method provided by the invention, the graphene is prepared through a three-order stripping mode; three-order stripping is sequentially first-order graphite mechanical stripping and intercalation, second-order solution expansion stripping and third-order ultrasonic stripping; as for the first-order graphite mechanical stripping and intercalation, graphite and an intercalation medium are mixed, and a certain degree of stripping and intercalation are performed on the graphite through a mechanical mode to obtain a graphene precursor; as for the second-order solution expansion stripping, the graphene precursor is added in a strong acid solution to separate the graphene, and graphene interlamination with defects is further opened to obtain an active graphene dispersion liquid; and as for the third-order ultrasonic stripping, the active graphene dispersion liquid is further subjected to ultrasonic stripping to obtain a graphene dispersion liquid with small sheet layer thickness and small layer amount. The graphene preparation method is simple in technology, mild in condition and low in cost; and the prepared graphene is thin in sheet layer, little in defects and high in quality.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and relates to graphene materials, in particular to a graphene preparation method and graphene. Background technique [0002] Graphene has excellent properties in electricity, optics, mechanics, etc., so its application fields are quite extensive. Many scientific researchers have carried out a series of research work in various fields, but in the process of research or practical application, the performance of graphene is greatly reduced. The reason is that the graphene used has many defects, and its actual performance is quite different from the theoretical performance; the second graphene has poor compatibility with other materials, and its performance cannot be fully exerted in the process of making products. [0003] Whether graphene has many defects or poor compatibility, these will limit the development of graphene, which is not conducive to the development of downstream applica...

Claims

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Application Information

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IPC IPC(8): C01B32/19
CPCC01B2204/04C01B2204/30C01P2002/72C01P2004/04
Inventor 王良多陈武峰张晓平
Owner 昂星新型碳材料常州有限公司
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