A method for rapidly preparing graphene with microwave-assisted stirring

A microwave-assisted, graphene technology, applied in the direction of graphene, chemical instruments and methods, nano-carbon, etc., can solve the problem of inability to realize continuous production of graphene, damage to the integrity of graphene lattice, and low exfoliation efficiency of graphene powder and other problems, to achieve the effect of easy realization of large-scale industrial production, continuous and stable preparation, and low cost

Active Publication Date: 2018-11-16
山东聊城莱鑫粉末材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the dispersant is water-soluble, there are still naphthalene tetracarboxylic dianhydride units, the raw material is expensive, and the cost is still high
[0008] 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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Prepare flake graphite, foaming additive sodium carbonate, water and surfactant sodium lauryl sulfate in a mass ratio of 1:2:5:0.1 to make a dispersion suspension, stir and disperse at a speed of 300rpm 10min 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 100 KW is used to ultrasonically treat the graphite, and it is naturally filtered to promote foaming additives. Fully enter the interlayer;

[0032] (2) Add the naturally-filtered graphite to the feed port of the high-mixer device, and control the feeding speed to 0.2cm 3 / s, the blade speed of high-speed rotation in the control high-mix agitator is 500rpm, and graphite is mixed and stripped by the high-mix agitator;

[0033] (3) While the high-mixer is mechanically peeling off, a microwave window is used to introduce microwaves with a power of 500W into the high-mixer. Under th...

Embodiment 2

[0036] (1) Prepare expanded graphite, foaming additive potassium carbonate, water and surfactant sodium dodecylbenzenesulfonate in a mass ratio of 1:2.5:6:0.2 to form 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 4 days. During the standstill, 150KW of ultrasonic power is used to ultrasonically treat the graphite, and it is naturally filtered to promote the foaming additive. into the interlayer;

[0037] (2) Add the naturally-filtered graphite to the feed port of the high-mixer device, and control the feeding speed to 0.2cm 3 / s, the blade rotation speed of the high-speed rotation in the control high-mix agitator is 600rpm, and graphite is mixed and stripped by the high-mix agitator;

[0038] (3) While the high-mixer is mechanically peeling off, the microwave window is used to introduce microwaves with a power of 70...

Embodiment 3

[0041] (1) Prepare high-oriented graphite, foaming additive sodium bicarbonate, water and 1-pyridine acid in a mass ratio of 1:3:7:0.3 to prepare a dispersion suspension, stir and disperse at a speed of 450rpm for 12min, until The graphite raw material is uniformly dispersed in the solvent to obtain a dispersed suspension, which is left to stand for 5 days. During the standing process, 150 KW of ultrasonic power is used to ultrasonically treat the graphite, and it is naturally filtered to promote the foaming additive to fully enter the interlayer;

[0042] (2) Add the naturally-filtered graphite to the feed port of the high-mixer device, and control the feeding speed to 0.2cm 3 / s, the blade rotation speed of the high-speed rotation in the control high-mix agitator is 750rpm, and graphite is mixed and stripped by the high-mix agitator;

[0043] (3) While the high-mixer is mechanically peeling off, a microwave window is used to introduce microwaves with a power of 800W into the...

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Abstract

The invention provides a method of fast preparing graphene through microwave assisted stirring. Graphite powder is adopted as a raw material, graphite powder and a foamer are mixed, graphite is infiltrated by the foamer and then put into a high mixing machine, high speed stirring is utilized to make graphite in a complete suspension state and a high speed motion state, meanwhile, microwave stripping is adopted to aid so that the foamer among graphite layers can fast react to generate support force, and continuous, fast, environment-friendly and clean preparation of a graphene material can be achieved. According to the method of fast preparing graphene through microwave assisted stirring, the technical effect of continuous, clean and environment-friendly production of graphene is achieved, and industrialized production of graphene dry powder is promoted; further, cutting and stripping are completed through one step in the high mixing machine, graphene is scattered evenly, not only is the layer structure of graphene maintained to the greatest extent, but also the graphene material can be prepared continuously and stably, surface integrity and topological symmetry of graphene are not destroyed, and the quality of graphene finished products is ensured further.

Description

technical field [0001] The invention relates to the field of nanomaterial processing, in particular to a method for rapidly preparing graphene with microwave-assisted stirring. 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 broad development pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19
CPCC01B2204/04C01B2204/32
Inventor 陈庆曾军堂王镭迪
Owner 山东聊城莱鑫粉末材料科技有限公司
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