Aqueous graphene slurry and preparation method thereof

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...

Examples

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...

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...

Examples

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...