Aqueous graphene slurry and preparation method thereof

A water-based, graphene-based technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of low density of graphene powder, easy agglomeration, difficulty in dispersing graphene, etc., to avoid accumulation and agglomeration, The effect of solving the difficult size control and improving the dispersion performance

Inactive Publication Date: 2018-08-28
HAIMEN CITY RUITAI TEXTILE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large specific surface area of ​​graphene powder, ordinary drying methods are easy to agglomerate, resulting in serious sheet stacking and agglomeration, which makes it difficult to disperse graphene in the later application process; the freeze-drying process consumes a lot of energy, low efficiency
In addition, due to the extremely low density of the fluffy graphene powder, it is easy to fly, causing inconvenience during packaging, transportation and use

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0023] Correspondingly, the embodiment of the present invention is also a kind of preparation method of graphene water-based slurry comprising the following steps:

[0024] S01. Using graphite oxide solid or expandable graphite solid as raw material, carry out expansion treatment to prepare expanded graphite;

[0025] S02. soaking the expanded graphite in an aqueous stripping solution to obtain a mixture containing expanded graphite;

[0026] 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;

[0027] S04. The graphene wet material is placed in an aqueous dispersion, and subjected to high-speed shearing treatment to obtain an aqueous graphene slurry.

[0028] 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...

Embodiment 1

[0043] A kind of graphene aqueous slurry and preparation method thereof, comprises the following steps:

[0044] 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;

[0045] S12. Soak the expanded graphite in 3L of deionized water with a volume percentage of 15% ammonia water and a mixed stripping solution composed of n-octanol with a mass concentration of 4×10-4kg / kg and stir and wet it for 1h to obtain an expanded graphite a mixture of graphite;

[0046] S13. The mixture containing expanded graphite is subjected to 800W ultrasonic action for 4h, and after centrifugal filtration, a graphene filter cake is obtained;

[0047] 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...

Embodiment 2

[0049] A kind of graphene aqueous slurry and preparation method thereof, comprises the following steps:

[0050] 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;

[0051] S22. Soak the expanded graphite in a mixed stripping solution composed of 1L volume percentage of 15% ammonia water and n-octanol with a mass concentration of 4 × 10-4kg / kg, stir and wet for 1h, and obtain a mixture containing expanded graphite;

[0052] S23. The mixture containing expanded graphite is subjected to 1000W ultrasonic action for 3h, and after vacuum filtration, a graphene filter cake is obtained;

[0053] 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 discloses aqueous graphene slurry and a preparation method thereof. The aqueous graphene slurry comprises aqueous dispersion liquid and a graphene material dispersed in the aqueous dispersion liquid, wherein the aqueous dispersion liquid contains a surfactant, and the mass content of graphene is 0.2 to 12%. The preparation method for the aqueous graphene slurry comprises the following steps: with a graphite oxide solid or an expandable graphite solid as a raw material, performing expansion treatment to prepare expanded graphite; immersing the expanded graphite in an aqueous stripping solution for infiltration treatment to obtain a mixture containing the expanded graphite; subjecting the mixture containing the expanded graphite to high-speed shearing or ultrasonic treatment toremove the aqueous stripping solution and obtain a wet graphene material; and adding the wet graphene material in aqueous dispersion liquid, and carrying out high-speed shearing to obtain aqueous graphene slurry. The aqueous graphene slurry prepared by using the method of the invention can be applied to the fields of electroconductive and heat-conductive coatings, anticorrosive coatings, batteries/supercapacitors and the like.

Description

technical field [0001] The invention particularly relates to a graphene aqueous slurry and a preparation method thereof, belonging to the field of graphene materials. 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 exfoliatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19C01B32/192C01B32/194
CPCC01B2204/04
Inventor 姜惠敏
Owner HAIMEN CITY RUITAI TEXTILE TECH CO LTD
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