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Large graphene stripping production method

A production method and graphene technology, which are applied in the field of physical exfoliation production of large sheets of graphene, can solve the problems of reducing the service life of equipment, large acid consumption, sulfur residue in products, etc., and achieve the effect of reducing requirements and improving conductivity.

Inactive Publication Date: 2016-06-01
江苏碳谷二维世界科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of chemical substance intercalation process consumes a lot of acid, and there are harmful gases such as SOx and NOx or pollution of heavy metal ions in the production process. There are sulfur residues in the product, and the final graphene is prone to defects, and it is harmful to equipment during application. There is corrosion, which reduces the service life of the equipment and increases the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The present invention is a kind of exfoliation production method of large sheet graphene, and the method comprises the following steps:

[0027] S1. Inject graphite flakes with a purity of more than 98% and a particle size of 30-500 μm and the stripping solution into the kettle body with a stirrer, start the motor of the kettle body to stir, and mix the materials evenly. The stripping solution is composed of: water 100 parts by weight, 60 parts by weight of ethanol, 50 parts by weight of polyacrylate, 1 part by weight of flake zinc powder, and 0.5 parts by weight of lithium fluoride. Among them, the number average molecular weight of the polyacrylate is greater than 100,000; the size of the flaky zinc powder is 3-10 microns. The weight ratio of graphite flakes and stripping liquid is 1:4.

[0028] S2. Heat the kettle body, keep the temperature in the kettle body at 80° C., the pressure at 1 atm, the rotation speed of the stirring shaft at 2000 rpm / min, and the reaction...

Embodiment 2

[0033] The present invention is a kind of exfoliation production method of large sheet graphene, and the method comprises the following steps:

[0034] S1. Inject graphite flakes with a purity of more than 98% and a particle size of 30-500 μm and the stripping solution into the kettle body with a stirrer, start the motor of the kettle body to stir, and mix the materials evenly. The stripping solution is composed of: water 100 parts by weight, 15 parts by weight of ethanol, 15 parts by weight of n-propanol, 80 parts by weight of polyurethane modified acrylate, 30 parts by weight of flake nickel powder, and 2 parts by weight of sodium fluoride. Wherein, the number-average molecular weight of the polyurethane-modified acrylate is greater than 100,000; the size of the flaky nickel powder is 3-10 microns. The weight ratio of graphite flakes and stripping liquid is 1:3.

[0035] S2. Heat the kettle body, keep the temperature in the kettle body at 50° C., the pressure at 3 atm, the ...

Embodiment 3

[0040] The present invention is a kind of exfoliation production method of large sheet graphene, and the method comprises the following steps:

[0041] S1. Inject graphite flakes with a purity of more than 98% and a particle size of 30-500 μm and the stripping solution into the kettle body with a stirrer, start the motor of the kettle body to stir, and mix the materials evenly. The stripping solution is composed of: water 100 parts, 30 parts by weight of n-butanol, 50 parts by weight of propylene glycol, 60 parts by weight of polyurethane modified acrylate, 20 parts by weight of flake silver powder, and 4 parts by weight of sodium chloride. Wherein, the number-average molecular weight of the polyurethane-modified acrylate is greater than 100,000; the size of the flaky silver powder is 3-10 microns. The weight ratio of graphite flakes and stripping liquid is 1:5.

[0042] S2. Heat the kettle body, keep the temperature in the kettle body at 60° C., the pressure at 2 atm, the ro...

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Abstract

The invention discloses a large graphene stripping production method. The method comprises the following steps: S1, injecting graphite flakes and a stripping liquid into a kettle body with a stirrer, and starting a motor of the kettle body for stirring, wherein the stripping liquid comprises the components of 100 parts of water, 30-100 parts of an alcoholic solvent, 50-80 parts of polyacrylate or polyacrylate derivants, 1-30 parts of flaky metal powder and 0.5-5 parts of water soluble salt; S2, heating the kettle body, keeping the temperature in the kettle body to be 50-80 DEG C, keeping the pressure to be 1-3 atm, keeping the rotating speed of a stirring shaft to be 1000-2000 rpm and keeping the reaction time to be 3-6 h; S3, discharging an upper layer suspending liquid after the reaction stops, and performing still standing; S4, conveying the graphene suspending liquid to a centrifuge for centrifugation, taking a supernatant after centrifugation, and conducting vacuum filtration to obtain filter cake; S5, washing the filter cake, and conducting freeze drying. According to the method, equipment cannot be corroded, graphene cannot be damaged, and large graphene can be obtained.

Description

technical field [0001] The invention relates to the technical field of graphene production, in particular to a physical exfoliation production method of large sheets of graphene. Background technique [0002] Graphene is a two-dimensional material with good flexibility and electrical properties. What needs to be added is that, strictly speaking, graphene is a single-layer sheet; however, due to the difficulty of preparing single-layer graphene, oligolayer graphene with similar properties is generally also classified into the category of graphene. Inside. [0003] At present, the methods for preparing graphene mainly include: chemical growth method and physical exfoliation method. Compared with the chemical growth method, which is inefficient and not suitable for industrial mass production, the physical exfoliation method mainly uses cheap graphite as a raw material, and applies mechanical force to the graphite crystal to cause the graphite layers to peel off, breaking the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 戴加龙
Owner 江苏碳谷二维世界科技有限公司
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