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Graphene and low-cost preparation method thereof

A graphene, low-cost technology, applied in the field of graphene and its low-cost preparation, can solve the problems of high cost, difficult scale production, difficult transfer, etc., achieve high room temperature electrical conductivity and thermal conductivity, reduce raw material costs, The effect of reducing environmental pressure

Active Publication Date: 2018-07-24
HUBEI INST OF AEROSPACE CHEMOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Micro-mechanical exfoliation method can produce micron-scale graphene, but its controllability is poor, the yield is low, and it is difficult to carry out large-scale production; the epitaxial growth method can obtain large-scale graphene by heating and epitaxial growth on the SiC (0001) crystal surface area of ​​single-layer graphene, but its growth efficiency is low, poor controllability and difficult to transfer; oxidation-reduction method is the mainstream method of industrial graphene preparation, but this method obtains more graphene defects resulting in more layers and lower quality Poor, it is difficult to apply in the electronic field; CVD method is one of the ways to obtain high-quality graphene, but its biggest problem is that it is difficult to industrialize production
Therefore, the existing main preparation technologies have problems such as high cost, low yield, long time consumption, and harsh experimental conditions.

Method used

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  • Graphene and low-cost preparation method thereof

Examples

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preparation example Construction

[0045] A kind of low-cost preparation method of graphene of the present invention specifically comprises the following steps:

[0046](1) Cut the plastic product into a solvent and place it in an ultrasonic cleaner for cleaning for a period of time to remove the printing ink and attached pollutants on the surface of the plastic bag. The plastic products may be discarded plastic products, such as plastic bags, plastic film or plastic skin of plastic bottles, etc., and may be polyethylene plastic products, polystyrene plastic products or polypropylene plastic products.

[0047] In this step, the ultrasonic frequency is 100-1000 W, and the ultrasonic time is 5-60 min. The selected cleaning solvent is absolute ethanol, acetone, tetrahydrofuran, ethyl acetate, diethyl ether or dimethylformamide.

[0048] (2) Use a precision cutter to break the cleaned plastic product into small pieces, and then wash it again with a solvent; the selected solvent is the same as in step (1).

[0049...

Embodiment 1

[0059] Step 1: Cut the polyethylene plastic bag into tetrahydrofuran and place it in an ultrasonic cleaning machine at 300W for 40 minutes to remove the printing ink and attached pollutants on the surface of the plastic bag;

[0060] Step 2: Use a precision cutter to break the cleaned polyethylene plastic bag into small pieces, and then wash it again with tetrahydrofuran, the method is the same as step 1;

[0061] Step 3: Put the small pieces of polyethylene plastic bags in a ball mill tank at a ball-to-material ratio of 50:1 and mill them at 6000rmp for 70 minutes to obtain curly polyethylene plastic bag micro-chips; the obtained micro-chips have a diameter of 40-70 microns;

[0062] Step 4: Place the polyethylene plastic bag micro-fragments in a vacuum furnace for carbonization at 1200°C for 20 minutes, and ball mill the carbonized powder blocks at 4000rmp for 60 minutes to obtain carbonized powder; the vacuum degree in the vacuum furnace is -3 MPa; the particle size of the o...

Embodiment 2

[0067] Step 1: Cut the polyethylene plastic bag into acetone and place it in an ultrasonic cleaning machine at 400W for 30 minutes to remove the printing ink and attached pollutants on the surface of the plastic bag;

[0068] Step 2: Use a precision cutter to break the cleaned polyethylene plastic bag into small pieces, and then clean it again with acetone; the method is the same as step 1;

[0069] Step 3: Put the small pieces of polyethylene plastic bags in a ball mill tank at a ball-to-material ratio of 70:1 and mill them at 9000rmp for 50 minutes to obtain curly polyethylene plastic bag micro-chips; the diameter of the obtained micro-chips is 10-30 microns;

[0070] Step 4: Place the polyethylene plastic bag micro-fragments in a vacuum furnace for carbonization at 1300°C for 20 minutes, and ball mill the carbonized powder block at 5000rmp for 80 minutes to obtain carbonized powder; the vacuum degree in the vacuum furnace is -3 MPa; The particle diameter of the carbonized po...

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Abstract

The invention relates to graphene and a low-cost preparation method thereof. The low-cost preparation method comprises the following steps: carrying out ultrasonic cleaning on plastic products; then crushing the plastic product and carrying out ball milling to obtain a plastic product micro-fragment; then carbonizing and carrying out the ball milling to obtain carbonized powder with fine granularity; carrying out secondary calcination on the carbonized powder; washing, purifying and drying to finally obtain the graphene. The graphene provided by the invention takes the plastic product or dailywaste plastic products, especially polyethylene plastic, polystyrene plastic and the like, as raw materials and the graphene is prepared through a specific technological method; the prepared graphenenot only has the advantages of low cost, controllable layer number, large specific surface area and high electric conductivity, and waste plastic is used as the raw material so that the environment protection pressure is greatly reduced; the method is suitable for preparation and production of the low-cost graphene and a result can be applied to researches of conducting materials, environment protection, coating, heat dissipation structures and solid propellants.

Description

technical field [0001] The invention relates to a graphene and a low-cost preparation method thereof, belonging to the technical field of graphene preparation. Background technique [0002] Graphene is a carbon atom with sp 2 The hybrid orbitals form a hexagonal planar film with a honeycomb lattice, a two-dimensional material with a thickness of only one carbon atom. "Cut" different shapes of sheets from graphene, warping can get zero-dimensional fullerene, curling can get one-dimensional barrel-shaped carbon nanotubes, stacking can get three-dimensional graphite, so we think graphene is The basic unit that constitutes other carbon materials is the most ideal carbon material so far. The successful preparation of two-dimensional crystal materials represented by graphene has opened up a new era of development of new nanomaterials and functional materials / devices. [0003] The unique crystal structure of graphene makes it have many unique properties, such as super large spec...

Claims

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Application Information

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IPC IPC(8): C01B32/184
CPCC01B2204/30
Inventor 顾健庞爱民郭翔李磊
Owner HUBEI INST OF AEROSPACE CHEMOTECH
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