Preparation method for single-layer graphene dispersion liquid

A technology of single-layer graphene and dispersion liquid, which is applied in the field of preparation of single-layer graphene dispersion liquid, can solve the problems of complicated single-layer graphene dispersion technology steps and poor dispersion effect, achieve excellent electrical and thermal conductivity, and improve dispersion performance, good thermal and electrical conductivity

Active Publication Date: 2018-03-30
YAHAM OPTOELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a single-layer graphene dispersion liquid, aiming at solving the problems of complicated steps and poor dispersion effect of the existing single-layer graphene dispersion technology

Method used

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Examples

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preparation example Construction

[0027] The embodiment of the present invention provides a kind of preparation method of monolayer graphene dispersion liquid, comprises the following steps:

[0028] S01. Provide natural flake graphite, carry out oxidation treatment, and prepare graphite oxide slurry;

[0029] S02. Add deionized water to the graphite oxide slurry, crush and peel off by a high-pressure homogenizer until the graphene oxide with an average thickness of 0.4-0.7nm and an average sheet diameter of 0.8-10 μm is obtained; the graphite oxide After freeze-drying the graphene, it is placed in a high-temperature atmosphere furnace, and a nitrogen-hydrogen mixture gas is introduced to carry out a temperature-programmed treatment, and cooled to room temperature to obtain a single-layer graphene powder;

[0030] S03. Place the single-layer graphene powder in a spray mixer, use an ethanol solution containing a dispersant as a spray, and spray dry it at a speed of 300-1000rpm and a temperature of 70-100°C. Af...

Embodiment 1

[0051] A preparation method of monolayer graphene powder dispersion liquid, comprises the following steps:

[0052] S11. Preparation of graphite oxide

[0053]Disperse 1g of 30μm natural flake graphite and 0.5g of sodium nitrate into 50g of concentrated sulfuric acid, add 3g of potassium permanganate under ice bath, and react for 0.5h, then raise the temperature of the oil change bath to 20°C to continue the reaction for 2h, add 200g of deionized water, and keep the temperature of the oil bath at 70°C for 2 hours, finally add 20% hydrogen peroxide until the reaction solution no longer produces bubbles, stop the reaction, add 1000g of 5% hydrochloric acid solution to the mixed solution, and then filter The cloth centrifuge is dried, the filter cloth mesh number of the filter cloth centrifuge is 8000 mesh, and the centrifugal speed is 3000rpm, then the dried slurry is washed with 1000g deionized water, dried again, and repeatedly washed and dried until The pH of the slurry is g...

Embodiment 2

[0059] A preparation method of monolayer graphene powder dispersion liquid, comprises the following steps:

[0060] S21. Preparation of graphite oxide

[0061] Disperse 2.5g of 50μm natural flake graphite and 1.5g of sodium nitrate into 125g of concentrated sulfuric acid, add 9g of potassium permanganate under ice bath, after reacting for 2h, heat the oil bath to 30°C to continue the reaction for 14h, add 350g of deionized water, and keep the oil bath temperature at 85 ℃ for 14h, finally add 20% hydrogen peroxide until the reaction solution no longer produces bubbles, stop the reaction, add 1500g of 5% hydrochloric acid solution to the mixed solution, and then filter The cloth centrifuge is dried, the filter cloth mesh number of the filter cloth centrifuge is 10000 mesh, and the centrifugal speed is 8000rpm, then the dried slurry is washed with 1500g deionized water, dried again, and repeatedly washed and dried until The pH of the slurry is greater than or equal to 6 to obtai...

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Abstract

The invention provides a preparation method for single-layer graphene dispersion liquid. The preparation method comprises the following steps: providing natural crystalline flake graphite, carrying out oxidation treatment, and preparing oxide graphite slurry; adding deionized water into the oxide graphite slurry, breaking and stripping through a high-pressure homogenizer until graphene oxide of which the average thickness is 0.4-0.7nm and the average sheet diameter is 0.8-10mu m is obtained; after the graphene oxide is subjected to freeze drying, introducing nitrogen and hydrogen mixed gas tobe subjected to program temperature rise treatment, and then, cooling to room temperature to obtain single-layer graphene powder; putting the single-layer graphene powder in an atomizing stirrer, taking ethanol solution which contains dispersing agent as spray, carrying out spraying drying under the conditions that revolving speed is 300-1000rpm and temperature is 70-100 DEG C, and continuously stirring to obtain the modified single-layer graphene powder after the spraying drying is finished; dissolving the modified single-layer graphene powder into organic solvent to be subjected to ultrasonic dispersion treatment to obtain the single-layer graphene dispersion liquid.

Description

technical field [0001] The invention belongs to the technical field of graphene dispersion liquid, in particular to a preparation method of single-layer graphene dispersion liquid. Background technique [0002] Graphene is a material with a monoatomic layer structure composed of carbon atoms in a hexagonal honeycomb lattice. It has excellent electrical, thermal and mechanical properties and can be widely used in various fields. However, graphene, as a two-dimensional nanomaterial, is very easy to agglomerate, and graphene re-transforms into a graphite structure after agglomeration, making it difficult to exert its unique properties. Therefore, how to uniformly disperse graphene is an urgent problem to be solved in current graphene applications. [0003] The existing dispersion technology is mainly divided into two types. The first method is to graft hydrophilic or lipophilic groups on the surface of graphite oxide, and then peel off and reduce it to graphene to prepare an e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19C01B32/194
CPCC01B2204/02C01B2204/04C01B2204/32
Inventor 焦伟棋王占明
Owner YAHAM OPTOELECTRONICS CO LTD
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