Viscous physical stripping method for graphene

A physical exfoliation and graphene technology, applied in the direction of graphene, nano-carbon, etc., can solve the problems of reducing the service life of equipment, high acid consumption, sulfur residue in products, etc., to improve shearing effect, improve electrical conductivity, and efficient exfoliation. Effect

Inactive Publication Date: 2016-06-29
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 resid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1

[0023] The present invention is a method for viscous physical exfoliation of graphene. The method includes the following steps:

[0024] S1. Pour the graphite flakes with a purity of 98% or more and a particle size of 30~500μm and the peeling liquid into the ball mill tank. The composition of the peeling liquid is: 100 parts by weight of water, 30 parts by weight of ethanol, and 50 parts by weight of polyacrylate Count, 0.5 parts by weight of lithium fluoride. Among them, the number average molecular weight of polyacrylate is greater than 100,000. The weight ratio of graphite flakes and peeling liquid is 1:2.

[0025] S2. Ball milling for 4 hours, the speed of the ball mill is 6000rpm / min.

[0026] S3. After the reaction is stopped, the suspension is discharged into the storage tank through the discharge port, and the initial product is obtained by standing for more than 24 hours.

[0027] S4. Transport the graphene suspension in the storage tank obtained in step S...

Example Embodiment

[0029] Example 2

[0030] The present invention is a method for viscous physical exfoliation of graphene. The method includes the following steps:

[0031] S1. Inject the graphite flakes with a purity of 98% or more and a particle size of 30~500μm and the stripping liquid into the ball mill tank. The composition of the stripping liquid is: 100 parts by weight of water, 40 parts by weight of ethanol, and 20 parts by weight of n-propanol. Count, 80 parts by weight of polyurethane-modified acrylate and 2 parts by weight of sodium fluoride. Among them, the number average molecular weight of the polyurethane-modified acrylate is greater than 100,000. The weight ratio of graphite flakes and peeling liquid is 1:3.

[0032] S2. Ball mill 8h, the speed of the ball mill is 4000rpm / min.

[0033] S3. After the reaction is stopped, the suspension is discharged into the storage tank through the discharge port, and the initial product is obtained by standing for more than 24 hours.

[0034] S4. Tra...

Example Embodiment

[0036] Example 3

[0037] The present invention is a method for viscous physical exfoliation of graphene. The method includes the following steps:

[0038] S1. Pour the graphite flakes with a purity of 98% or more and a particle size of 30~500μm and the stripping liquid into the ball mill tank. The composition of the stripping liquid is: 100 parts by weight of water, 40 parts by weight of n-butanol, and 40 parts by weight of propylene glycol. Number, 60 parts by weight of urethane-modified acrylate and 4 parts by weight of sodium chloride. Among them, the number average molecular weight of the polyurethane modified acrylate is greater than 100,000. The weight ratio of graphite flakes and peeling liquid is 1:4.

[0039] S2. The ball mill is 24h, the speed of the ball mill is 3000rpm / min.

[0040] S3. After the reaction is stopped, the suspension is discharged into the storage tank through the discharge port, and the initial product is obtained by standing for more than 24 hours.

[00...

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Abstract

The invention discloses a method for physically exfoliating graphene in a viscous state, comprising steps: S1. injecting graphite flakes and an exfoliation liquid into a ball mill tank, wherein the exfoliation liquid consists of 100 parts of water, 30-100 parts of alcohol solvent, 50-80 parts of polyacrylate or polyacrylate derivatives, 0.5-5 parts of water-soluble salt; S2. Ball milling for 4-48 hours, the speed of the ball mill is above 2000rpm/min; S3. After stopping the reaction, discharge the suspension to the storage material Standing in the tank; S4. Transporting the graphene suspension to a centrifuge for centrifugation, taking the supernatant and vacuum filtering to obtain a filter cake; S5. Washing and freeze-drying the filter cake. This exfoliation method can efficiently exfoliate graphene.

Description

technical field [0001] The invention relates to the technical field of graphene production, in particular to a graphene physical exfoliation production method. 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 van der Waals force...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/19
Inventor 戴加龙
Owner 江苏碳谷二维世界科技有限公司
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