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Preparation method of graphene dispersing liquid

A technology of graphene dispersion liquid and graphite, which is applied in the preparation of graphene dispersion liquid and high-quality graphene dispersion liquid. It can solve the problems of uneven graphene dispersion liquid, complex production process and high cost, and achieve easy mass production , The production process is simple and the cost is low

Inactive Publication Date: 2016-12-07
QINGDAO HUAGAO GRAPHENE CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcoming that prior art exists, propose a kind of green environmental protection method that prepares high-quality graphene dispersion liquid, to solve the problem that the graphene dispersion liquid that makes is inhomogeneous, overcome existing production process complexity, yield Low-cost and high-cost defects, improve the current situation of serious environmental pollution caused by production

Method used

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  • Preparation method of graphene dispersing liquid

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Effect test

Embodiment 1

[0012] The green and environment-friendly method for preparing high-quality graphene dispersion involved in this embodiment includes three process steps of preparation of dispersant solution, primary high-shear liquid phase exfoliation and secondary high-pressure exfoliation:

[0013] (1) Preparation of dispersant solution: 1 g of sodium lauryl sulfate dispersant was added to 1000 g of deionized water solvent, fully dissolved to obtain dispersant solution.

[0014] (2), a high-shear liquid phase exfoliation: 10g of graphite raw material flake graphite is added to the dispersant solution prepared in step (1), and then ball milling is carried out by a ball mill, and a high-shear is carried out under the action of a high shear force. The exfoliated graphite slurry was obtained by cutting liquid phase exfoliation.

[0015] (3), secondary high-pressure stripping: carried out in the secondary high-pressure stripping system, first apply a pressure of 100 MPa to the graphite slurry 2 ...

Embodiment 2

[0017] The green and environment-friendly method for preparing high-quality graphene dispersion involved in this embodiment includes three process steps of preparation of dispersant solution, primary high-shear liquid phase exfoliation and secondary high-pressure exfoliation:

[0018] (1), preparation of dispersant solution: 2g sodium dodecylbenzenesulfonate dispersant is added in 1000g N-N-dimethylformamide solvent, fully dissolved to obtain dispersant solution;

[0019] (2), a high-shear liquid phase exfoliation: 50g of graphite raw material graphite oxide is added to the dispersant solution prepared in step (1), and then sand-milled by a sand mill, carried out under the action of high shear force A high-shear liquid phase exfoliation to obtain an exfoliated graphite slurry;

[0020] (3), secondary high-pressure peeling: first apply a pressure of 200 MPa to the graphite slurry obtained in step (2), and then make it pass through a slit of 0.5mm width, when the high-pressure f...

Embodiment 3

[0022] The green and environment-friendly method for preparing high-quality graphene dispersion involved in this embodiment includes three process steps of preparation of dispersant solution, primary high-shear liquid phase exfoliation and secondary high-pressure exfoliation:

[0023] (1), preparation of dispersant solution: 10g sodium dodecylbenzenesulfonate dispersant is added in 1000g tetrahydrofuran solvent, fully dissolved to obtain dispersant solution;

[0024] (2), a high-shear liquid phase exfoliation: add 100g of graphite raw material expandable graphite to the dispersant solution prepared in step (1), then carry out high-speed stirring treatment by a high-speed mixer, and carry out under the action of high shear force A high-shear liquid phase exfoliation to obtain an exfoliated graphite slurry;

[0025] (3), secondary high-pressure peeling: first apply a pressure of 150MPa to the graphite slurry obtained in step (2), and then make it pass through a slit of 0.3mm wid...

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Abstract

The invention belongs to the technical field of preparation of graphene dispersing liquid and relates to a preparation method of the graphene dispersing liquid. The preparation method includes: dissolving a dispersing agent into a solvent to prepare a dispersing agent solution, adding a graphite raw material into the dispersing agent solution, performing primary high-shearing liquid phase stripping through high shearing force to obtain primarily stripped graphite slurry, applying pressure of 10-400MPa to the primarily stripped graphite slurry, then allowing the primarily stripped graphite slurry to pass a tiny slit and intensely collide with a breaking valve so as to allow the primarily stripped graphite slurry to be stripped by high shearing force and collision force for the second time, and allowing graphene to be evenly dispersed in the solvent to obtain the even graphene dispersing liquid. The preparation method has the advantages that the prepared graphene dispersing liquid is high in quality and good in evenness and stability, and the method is environmentally friendly in production process, capable of reducing environment pollution, simple in production process, easy in large-scale industrial production, high in yield, low in cost and friendly in application environment.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of graphene dispersion liquid, and relates to a method for preparing high-quality graphene dispersion liquid, in particular to directly prepare high-stability graphene dispersion liquid through one high-shear liquid phase exfoliation and two high-pressure exfoliation green approach. Background technique: [0002] Graphene is a two-dimensional crystal composed of a layer of carbon atoms. It is the thinnest and hardest nanomaterial known in the world. It is almost completely transparent and only absorbs 2.3% of light; its thermal conductivity is as high as 5300W / m· K, higher than carbon nanotubes and diamonds, and its electron mobility exceeds 15000cm at room temperature 2 / V·s, while the resistivity is only about 10 -8 Ω·m is the material with the smallest resistivity in the world. Scientists even predict that graphene will "completely change the 21st century", and it is very likely to set o...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 刘敬权郭洪云张萧丹
Owner QINGDAO HUAGAO GRAPHENE CORP LTD
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