Method for preparing graphene through full liquid water phase physical stripping

A technology of physical exfoliation and liquid water, applied in the direction of graphene, nano-carbon, etc., can solve the problems of low production efficiency, low efficiency, and low production cost, and achieve the effects of reduced production cost, simple preparation process, and complete lattice structure

Inactive Publication Date: 2018-12-21
明德润和新材料(珠海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation methods of graphene mainly include redox method, mechanical exfoliation method, chemical vapor deposition (CVD) and epitaxial growth etc., but these several methods have production efficiency low, production cost is low, the graphene product of preparation is unstable, it is difficult to Achieving large-scale quantitative production limits the application of graphene in terminal fields
For example, the single mechanical exfoliation method is green and environmentally friendly, and there is no problem of environmental pollution, but its operation controllability is poor, the size of the obtained graphene is small and there is a lot of uncertainty, and the efficiency is low, so it is not suitable for large-scale Production

Method used

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  • Method for preparing graphene through full liquid water phase physical stripping
  • Method for preparing graphene through full liquid water phase physical stripping
  • Method for preparing graphene through full liquid water phase physical stripping

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Embodiment 1

[0038] A method for preparing graphene by physical exfoliation of all liquid water phases, comprising the following steps:

[0039] 1) Add 100g of high-purity and high-carbon-content expanded graphite into 800ml of ultra-pure water and soak for 20 hours for wetting and soaking treatment;

[0040] 2) Put the expanded graphite after wetting and soaking treatment in step 1) into a sand mill equipped with a small amount of zirconium beads and stir for 2h, the rotating speed is 1500rad / min, then put into the colloid mill for 4h, the power of the colloid mill is Be 1.1KW, obtain expanded graphite soaking liquid;

[0041] 3) Put the expanded graphite soaking solution in step 2) into a high-pressure homogenizer, carry out high-pressure homogenization treatment at a pressure of 80Mpa for 2 hours, then use a high-shear emulsification pump for 3 hours, and then use an ultra-high pressure critical device at pressure Treat for 3h under 150Mpa to obtain a graphene dispersion;

[0042] 4) ...

Embodiment 2

[0046] A method for preparing graphene by physical exfoliation of all liquid water phases, comprising the following steps:

[0047] 1) Add 100g of high-purity and high-carbon-content expanded graphite into 1000ml of ultra-pure water and soak for 18 hours for wetting and soaking treatment;

[0048]2) Put the expanded graphite after wetting and soaking treatment in step 1) into a sand mill equipped with a small amount of zirconium beads and stir for 1.5h, the rotating speed is 2000rad / min, and then put into the colloid mill for 3h, the power of the colloid mill is The power is 1.1KW, and the expanded graphite soaking solution is obtained;

[0049] 3) Put the expanded graphite soaking solution in step 2) into a high-pressure homogenizer, perform high-pressure homogenization treatment at a pressure of 80Mpa for 1.5 hours, then use a high-shear emulsification pump for 2.5 hours, and then use an ultra-high pressure critical device Treating for 5h at a pressure of 150Mpa to obtain a...

Embodiment 3

[0052] A method for preparing graphene by physical exfoliation of all liquid water phases, comprising the following steps:

[0053] 1) Add 100g of high-purity and high-carbon-content expanded graphite into 1000ml of ultra-pure water and soak for 20 hours for wetting and soaking treatment;

[0054] 2) Put the expanded graphite after wetting and soaking treatment in step 1) into a sand mill equipped with a small amount of zirconium beads and stir for 3h, the rotating speed is 1200rad / min, then put into the colloid mill for 4h, the power of the colloid mill is Be 1.1KW, obtain expanded graphite soaking liquid;

[0055] 3) Put the expanded graphite soaking solution in step 2) into a high-pressure homogenizer, carry out a high-pressure homogenization process at a pressure of 80Mpa for 2.5 hours, then use a high-shear emulsification pump for 3 hours, and then use an ultra-high pressure critical device to Pressure is 150Mpa under processing 3h, obtains graphene dispersion liquid;

...

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Abstract

The invention discloses a method for preparing graphene through full liquid water phase physical stripping. The method comprises the following steps that (1) expanded graphite is soaked with water, and wetting soaking treatment is conducted; (2) the wetted and soaked expanded graphite is ground, and expanded graphite soaking liquid is obtained; (3) the expanded graphite soaking liquid is subjectedto high pressure homogeneity treatment, emulsification treatment and ultrahigh pressure critical treatment sequentially; and (4) standing is conducted till the liquid is layered, then spray drying isconducted, and graphene is obtained. The method adopts full liquid physical stripping, the solvent used in the method is water, so that the production process is energy-saving and environment-friendly; the raw materials used in the method are easy to get, no pollutants is generated in the preparation process, so that the preparation process is green and environmentally friendly, and cannot causeany pollution to the environment; the prepared graphene is intact in structure, contains a small amount of hydrophilic groups such as -OH, and has the good dispersing property; and graphene with different numbers of layers and specifications can be screened and prepared according to the requirement in different needed fields, so that graphene can be applied to different fields.

Description

technical field [0001] The present invention relates to the field of preparation of new materials, in particular to a method for preparing graphene, and more particularly to the preparation of graphene by a full-liquid aqueous phase physical exfoliation method, which can be used in the fields of heat conduction, conduction, novel coating additives and antistatic materials . Background technique [0002] Since Geim, a professor at the University of Manchester in the United Kingdom, first stripped graphene from graphite in 2004, graphene has attracted extensive attention from researchers due to its unique structure, properties and potential applications, and has become a research hotspot in many fields. . The preparation methods of graphene mainly include redox method, mechanical exfoliation method, chemical vapor deposition (CVD) and epitaxial growth etc., but these several methods have production efficiency low, production cost is low, the graphene product of preparation is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19
CPCC01B32/19
Inventor 周磊秦晓娟吴钦文周佳林昭宁
Owner 明德润和新材料(珠海)有限公司
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