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Method for preparing graphene through mechanical stripping and application of method

A mechanical exfoliation and graphene technology, applied in the field of graphene, can solve the problems of unstable quality of graphene, unfavorable for large-scale promotion, inability to realize exfoliation, etc., and achieve the effect of good exfoliation effect, fewer defects and low cost.

Active Publication Date: 2021-05-11
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation process of this method is simple and the manufacturing cost is low, but the distance between the graphite layers is 0.335nm, and only a small part of the gas molecules generated by heating the solid intercalation agent can penetrate into the graphite layer, and effective exfoliation cannot be achieved.
The quality of graphene stripped by this method is unstable and the yield is low, which is not conducive to large-scale promotion

Method used

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  • Method for preparing graphene through mechanical stripping and application of method
  • Method for preparing graphene through mechanical stripping and application of method
  • Method for preparing graphene through mechanical stripping and application of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The present embodiment has prepared a kind of graphene, and specific process is:

[0039] (1) Sodium α-alkenyl sulfonate, sodium fatty alcohol polyoxyethylene ether sulfate, coconut oil diethanolyl amide, polyethylene glycol 5000, and water are prepared in a mass ratio of 4:4:8:15:69 to prepare foam agent aqueous solution;

[0040] (2) Artificial graphite is uniformly pre-dispersed in the foaming agent aqueous solution of above-mentioned configuration, obtains artificial graphite pre-dispersion liquid, and its concentration is 10mg / mL;

[0041] (3) Add the artificial graphite pre-dispersion into the pin sand mill, the particle size of the grinding medium is 0.5mm, the filling amount is 80%, the stirring speed is 1500rmp, and the stirring time is 2h;

[0042] (4) by washing with water, and treating at a centrifugal speed of 1000rmp for 10min to obtain a graphene supernatant, that is, to obtain graphene.

[0043] from figure 1 From the SEM morphology of the raw graphit...

Embodiment 2

[0047] The present embodiment has prepared a kind of graphene, and specific process is:

[0048] (1) Sodium α-alkenyl sulfonate, sodium fatty alcohol polyoxyethylene ether sulfate, coconut oil diethanolyl amide, polyethylene glycol 4000, and water are prepared in a mass ratio of 5:2.5:7.5:15:70 to prepare foam agent aqueous solution;

[0049] (2) The graphite flakes are uniformly pre-dispersed in the aqueous foam solution of the above-mentioned configuration to obtain graphite flakes pre-dispersed liquid, the concentration of which is 10mg / mL;

[0050] (3) Add flake graphite pre-dispersion liquid into pin sand mill, grinding medium particle size 0.3mm, filling capacity 80%, stirring speed 1500rmp, stirring time 2h;

[0051] (4) by washing with water, and treating at a centrifugal speed of 2000rmp for 7 minutes to obtain the graphene supernatant, that is, to obtain graphene.

Embodiment 3

[0053] The present embodiment has prepared a kind of graphene, and specific process is:

[0054] (1) Sodium α-alkenyl sulfonate, sodium fatty alcohol polyoxyethylene ether sulfate, coconut oil diethanolyl amide, polyethylene glycol 3000, and water are prepared into foam according to the mass ratio of 3:2:5:15:75 agent aqueous solution;

[0055] (2) Uniformly pre-disperse the expandable graphite in the above-mentioned aqueous foam solution to obtain an expandable graphite pre-dispersion, the concentration of which is 10 mg / mL;

[0056] (3) Add the expandable graphite pre-dispersion into the pin sand mill, the particle size of the grinding medium is 0.8mm, the filling amount is 80%, the stirring speed is 1000rmp, and the stirring time is 3h;

[0057] (4) by washing with water, and treating at a centrifugal speed of 2500rmp for 5min to obtain the graphene supernatant, namely to obtain graphene.

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Abstract

The invention discloses a method for preparing graphene by mechanical stripping and application of the method, and the method comprises the following steps: (1) dispersing a graphite raw material in a foaming agent aqueous solution to obtain a graphite pre-dispersion liquid; and (2) grinding the graphite pre-dispersion liquid, conducting washing with water, and carrying out centrifugal classification to obtain graphene. The foaming agent aqueous solution comprises the following components: sodium alpha-olefin sulfonate, fatty alcohol polyoxyethylene ether sodium sulfate, coconut oil diethanol amide, polyethylene glycol and water. Graphite is adopted as a raw material, the graphite is soaked in a foaming agent aqueous solution and then ground, the high-speed stirring effect of grinding equipment drives a grinding medium to move at a high speed so as to generate impact, friction and shearing force on the graphite, the foaming agent generates a large number of stable and fine foams in a closed grinding cavity, and the large number of foams can generate a pushing effect; and the graphite is supported, and the contact surface between the graphite and the grinding medium is increased, so that a good stripping effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of graphene, and in particular relates to a method for preparing graphene by mechanical exfoliation and an application thereof. Background technique [0002] Graphene, a carbon structural material, carbon atoms in SP 2 The hybrid forms are arranged into a planar two-dimensional honeycomb structure, which is considered to be the thinnest material in the world. The special structure endows graphene with excellent optical, electrical, and mechanical properties. It can be used in many fields such as anti-corrosion coatings, thermal conductive coatings, and conductive additives. It is a revolutionary new material in the future. [0003] The preparation methods of graphene can be divided into two categories: exfoliation preparation and in situ generation. The exfoliation preparation uses graphite as the raw material, and under the action of force, the graphite is exfoliated layer by layer. This force can be mec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19
CPCC01B32/19C01B2204/32Y02E60/10H01M4/583C01B32/182C01B32/184C01B32/196C01B32/225C01B2204/22
Inventor 许建锋林倩吴小锋王苑阮丁山李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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