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Graphene aqueous slurry, and preparation method thereof

A graphene water-based and graphene technology, applied in the field of graphene water-based slurry and its preparation, can solve the problems of light density of graphene powder, difficult to control graphene size, difficult packaging and transportation, etc., to avoid accumulation and agglomeration, solve the It is difficult to control the size and the effect of improving the dispersion performance

Active Publication Date: 2015-12-02
SHENZHEN GUOCHUANG JIAWEI GRAPHENE TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of graphene water-based slurry and preparation method thereof, aim at simultaneously solving the easy reunion of sheet layer in existing graphene powder, causes graphene to disperse and apply difficulty; And graphene powder body density is light , Difficulty in packaging and transportation; and difficulty in controlling the size of graphene

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  • Graphene aqueous slurry, and preparation method thereof

Examples

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preparation example Construction

[0020] Correspondingly, the embodiment of the present invention is also a kind of preparation method of graphene water-based slurry comprising the following steps:

[0021] S01. Using graphite oxide solid or expandable graphite solid as raw material, carry out expansion treatment to prepare expanded graphite;

[0022] S02. soaking the expanded graphite in an aqueous stripping solution to obtain a mixture containing expanded graphite;

[0023] S03. The mixture containing expanded graphite is subjected to high-speed shearing or ultrasonic treatment, and the stripping liquid is removed to obtain a graphene wet material;

[0024] S04. The graphene wet material is placed in an aqueous dispersion, and subjected to high-speed shearing treatment to obtain an aqueous graphene slurry.

[0025] Specifically, in the above step S01, the embodiment of the present invention uses graphite oxide solid or expandable graphite solid as a raw material. The selection of the graphite oxide solid o...

experiment example 1

[0047] A kind of graphene aqueous slurry and preparation method thereof, comprises the following steps:

[0048] S11. Take 14g of expandable graphite with a particle size of 80 mesh and an oxygen content of 10%, and carry out expansion treatment in a high-temperature expansion furnace at 1000°C to prepare 10g of expanded graphite;

[0049] S12. Soak the expanded graphite in 3L deionized water with a volume percentage of 15% ammonia and a mass concentration of 4×10 -4 kg / kg of n-octanol in the mixed stripping solution, stirred and wetted for 1 hour to obtain a mixture containing expanded graphite;

[0050] S13. The mixture containing expanded graphite is subjected to 800W ultrasonic action for 4h, and after centrifugal filtration, a graphene filter cake is obtained;

[0051] S14. Dispersing the graphene filter cake in 190g deionized water, adding PVP to adjust the surface tension within the range of 40-50mN / m, and sanding it in a nano sand mill for 6h to obtain graphite with a...

experiment example 2

[0053] A kind of graphene aqueous slurry and preparation method thereof, comprises the following steps:

[0054] S21. Get 14g of expandable graphite with a particle size of 150 mesh and 10% oxygen content, and carry out expansion treatment in an industrial microwave oven to prepare 10g of expanded graphite;

[0055] S22. Soak the expanded graphite in 1L volume percentage of 15% ammonia water and a mass concentration of 4×10 -4 kg / kg of n-octanol in the mixed stripping solution, stirred and wetted for 1 hour to obtain a mixture containing expanded graphite;

[0056] S23. The mixture containing expanded graphite is subjected to 1000W ultrasonic action for 3h, and after vacuum filtration, a graphene filter cake is obtained;

[0057] S24. Disperse the graphene filter cake in 90g of absolute ethanol, add sodium citrate to adjust the surface tension within the range of 40-50mN / m, and shear and disperse for 3h to obtain graphene with a weight percentage of about 10%. Ethanol slurry...

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Abstract

The invention belongs to the field of graphene material, and provides a graphene aqueous slurry, and a preparation method thereof. The graphene aqueous slurry comprises an aqueous dispersion liquid and a graphene material dispersed in the aqueous dispersion liquid, wherein the aqueous dispersion liquid contains a surfactant. The preparation method comprises following steps: graphite oxide solid or expansible graphite solid is taken as a raw material, and expansion treatment is carried out so as to prepare expanded graphite; the expanded graphite is immersed into an aqueous stripping liquid for infiltration treatment so as to obtain a mixture containing the expanded graphite; the mixture containing the expanded graphite is subjected to high-speed shearing or ultrasonic treatment so as to remove the aqueous stripping liquid so as to obtain a graphene wet material; the graphene wet material is added into the aqueous dispersion liquid, and high-speed shearing is carried out so as to obtain the graphene aqueous slurry.

Description

technical field [0001] The invention belongs to the field of graphene materials, in particular to a graphene aqueous slurry and a preparation method thereof. Background technique [0002] Graphene is a new type of carbon nanomaterial. As the thinnest (single-atom-thick) nanomaterial in the world, it contains rich and unique physical and chemical properties, such as a huge specific surface area (2,630m 2 g -1 ), higher Young's modulus (-1.0TPa), higher intrinsic electron mobility (200,000cm 2 · v -1 ·s -1 ), thermal conductivity (5,000W·m -1 ·K -1 ), conductivity and transparency (97.7%). The above advantages of graphene make it widely used in many fields, such as transparent conductive films, sensors, polymer composites, energy storage materials, biomedicine, thermally conductive coatings, anti-corrosion coatings, etc. [0003] At present, the preparation methods of graphene mainly include redox method, liquid phase exfoliation method, mechanical exfoliation method, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 郭焕焕慈立杰丁显波杨杰
Owner SHENZHEN GUOCHUANG JIAWEI GRAPHENE TECH CO LTD
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