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A method for preparing graphene powder by crushing and application of graphene powder

A graphene powder and graphene technology, which is applied in the application field of graphene powder, can solve the problems of complex early process, mixed size, and harm to human health, so as to reduce the cost of large-scale production, shorten the production cycle, and improve the work efficiency. efficiency effect

Active Publication Date: 2019-02-26
崔晓慧
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology cannot be applied on a large scale, and the sampling process on the electrode side is complicated, and the graphene is not separated in time during the peeling process.
[0005] Chinese Patent Publication No. 201410235949.X discloses a method for separating graphene oxide of different sizes in the preparation of graphene oxide, which involves the preparation of graphene oxide, and uses graphene oxide of different sizes to prepare graphite oxide by redox method , the dispersibility in the solvent is different, and the graphene oxide of different sizes is separated as follows: the precipitated B-GOSs1 is a graphene oxide product with a size larger than 25um, the graphene oxide product with a size of 15um< GOSs2 is ≦25um, Graphene oxide products with a size of 5um < GOSs3 with a size of ≦ 15um and precipitated F-GOSs4 with a size of ≦ 5um have overcome the complete mixing of the sizes of graphene oxide products prepared by various existing redox methods, Irregular distribution of defects
However, this technology is limited to fractionation and separation of graphene. At the end of the process, in terms of continuous industrial production, a method for fractionating the product while exfoliating graphene is needed, which can make full use of raw materials and reduce costs.
[0007] To sum up, the exfoliation efficiency of graphene powder prepared by mechanical exfoliation method is low, and the dust pollution in the production process is serious, and the continuous production of graphene cannot be realized.
If a strong oxidant is used to pretreat graphite, polar groups will be grafted on the surface of the prepared graphene, which will endanger human health and cause environmental pollution, destroy the lattice integrity of graphene, and reduce the electrical conductivity of the system.
The process of fractional separation and treatment of graphene is complicated in the early stage. If the fractional treatment technology is used in the early stage of preparation to continuously separate the mechanically exfoliated graphene products, this will greatly reduce the production cycle of graphene.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Prepare flake graphite, intercalation additive acrylamide, water and surfactant sodium lauryl sulfate according to the mass ratio of 1:2:5:0.1 to prepare a dispersion suspension, stir and disperse at a speed of 300rpm 10 minutes until the graphite raw material is uniformly dispersed in the solvent to obtain a dispersed suspension, which is left to stand for 3 days. During the standstill, an ultrasonic power of 100KW is used to ultrasonically treat the graphite to promote the intercalation additive to fully enter the interlayer.

[0032] (2) Add the dispersed suspension solution into the conical mill device, control the high-speed rotating blade rotation speed in the conical mill to 500rpm, and the grinding time of the conical mill is 30 minutes. After the grinding is completed, it enters the filter, and the The powder that does not meet the size requirements is returned to the conical mill to continue grinding, and the graphite is thinned by the conical mill to obtai...

Embodiment 2

[0037] (1) Prepare expanded graphite, intercalation additive formamide, water and surfactant sodium dodecylbenzenesulfonate in a mass ratio of 1:2.5:6:0.2 to prepare a dispersion suspension at a speed of 350rpm Stir and disperse for 15 minutes until the graphite raw material is uniformly dispersed in the solvent to obtain a dispersed suspension, which is left to stand for 3.5 days. During the standstill, an ultrasonic power of 125 KW is used to ultrasonically treat the graphite to promote the intercalation additive to fully enter the interlayer. .

[0038] (2) Add the dispersed suspension solution to the conical mill device, control the high-speed rotating blade rotation speed in the conical mill to 750rpm, and the grinding time of the conical mill is 60 minutes. After the grinding is completed, it enters the filter, and the The powder that does not meet the size requirements is returned to the conical mill to continue grinding, and the graphite is thinned by the conical mill ...

Embodiment 3

[0043] (1) Prepare highly oriented graphite, intercalation additive potassium acetate, water and surfactant polyvinylpyrrolidone in a mass ratio of 1:3:7.5:0.3 to prepare a dispersion suspension, stir and disperse at 400rpm for 20min, Until the graphite raw material is evenly dispersed in the solvent, a dispersed suspension is obtained, and left to stand for 4 days. During the standstill, 300 KW of ultrasonic power is used to ultrasonically treat the graphite to promote the intercalation additive to fully enter the interlayer.

[0044] (2) Add the dispersed suspension solution into the conical mill device, control the high-speed rotating blade rotation speed in the conical mill to 750rpm, and the grinding time of the conical mill is 80 minutes. After the grinding is completed, enter the filter, and the The powder that does not meet the size requirements is returned to the conical mill to continue grinding, and the graphite is thinned by the conical mill to obtain radial large-s...

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Abstract

The invention provides a method for preparing graphene powder through crushing and application of the graphene powder. The graphene powder with uniform particle sizes is obtained through gradual reduction of the particle sizes of graphite. The method particularly comprises the steps of carrying out sheet treatment on the graphite by adopting a cone mill, crushing by using a high-speed rod pulverizer to obtain the graphene powder with uniform and large radial dimension; and carrying out further intercalation, crushing and peeling by using the shear force generated by a grader and carrying out grading treatment to obtain the graphene powder. The prepared graphene powder is low in cost, good in disperse machinability, large in sheet diameter and suitable for a lubricating additive. According to the method, continuous, clean and environment-friendly technical effects of graphene production are achieved, and industrialized production of the graphene powder is promoted.

Description

technical field [0001] The invention relates to the field of nanomaterial processing, in particular to a method for preparing graphene powder by crushing and the application of graphene powder. Background technique [0002] Graphene is a planar carbon nanomaterial composed of a layer of carbon atoms. It is the thinnest known two-dimensional material, with a thickness of only 0.335nm. It is composed of a hexagonal lattice. The carbon atoms in graphene are connected by σ bonds, endowing graphene with extremely excellent mechanical properties and structural rigidity. Moreover, in graphene, each carbon atom has an unbonded p-electron. These p-electrons can move freely in the crystal, and the speed of movement is as high as 1 / 300 of the speed of light, which endows graphene with good conductivity. Optically, graphene is almost completely transparent, absorbing only 2.3 percent of light. Graphene has unique mechanical, optical and electrical properties, and graphene has very bro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19C01B32/192C10M125/02C10N30/06
CPCC10M125/02C10M2201/041C10N2030/06C10N2020/06
Inventor 陈庆曾军堂王镭迪
Owner 崔晓慧
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