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Method for preparing graphene by mechanically driving rubber molecules to strip flake graphite

A technology for exfoliating graphene and flake graphite, applied in graphene, chemical instruments and methods, inorganic chemistry and other directions, can solve problems such as affecting the number of graphene layers, diameter, affecting graphene preparation cost and efficiency, etc. The production process and process conditions are controllable and the electrical conductivity is good.

Active Publication Date: 2019-09-24
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the difference in preparation process not only affects the cost and efficiency of graphene preparation, but also directly affects the number of layers and diameter of graphene, the density of lattice defects, the type of edge functional groups and surface properties, etc., which affects subsequent applications and functionality. It has become an important factor restricting the large-scale application of graphene

Method used

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  • Method for preparing graphene by mechanically driving rubber molecules to strip flake graphite
  • Method for preparing graphene by mechanically driving rubber molecules to strip flake graphite
  • Method for preparing graphene by mechanically driving rubber molecules to strip flake graphite

Examples

Experimental program
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Effect test

Embodiment 1

[0043] (1) Beneficiation and enrichment of flake graphite

[0044] Put 50g of flake graphite ore powder with a diameter of less than 5.0mm into a ball mill jar, add water to make 1 liter of slurry, add 400g of zirconia ceramic balls with a diameter of 5mm, 7.5mL of engine oil, 2.5g of sodium hexametaphosphate, and the ball mill speed at 1500rpm, After grinding for 20 minutes, pour it into the flotation cell of the flotation machine for flotation, scrape off the upper layer of foam, dehydrate and dry to obtain high-purity flake graphite crystals.

[0045] (2) Synergistic exfoliation of flake graphite crystals by styrene-butadiene rubber and nitrile rubber

[0046] Add 30g styrene-butadiene rubber and 70g nitrile-butadiene rubber into a 0.2L internal mixer, and add 10g of flake graphite crystals prepared in the above step (1), start the machine, and after banburying at a rotating speed of about 40rpm for 5min, take it out and turn it into a rotating speed The two-roll mill of a...

Embodiment 2

[0053] (1) Beneficiation and enrichment of flake graphite

[0054] Put 300g of flake graphite raw ore with a diameter of less than 0.05mm into a ball mill jar, add water to make 1 liter of slurry, add 300g of zirconia ceramic balls with a diameter of 5mm, 1.5mL of hydraulic oil and 1.5mL of rapeseed oil, 0.3g of sodium pyrophosphate, The speed of the ball mill is 300rpm. After grinding for 180min, it is poured into the flotation cell of the flotation machine for flotation, and the upper layer of foam is scraped off. After dehydration and drying, high-purity flake graphite crystals are obtained.

[0055] (2) EPDM exfoliated flake graphite crystal

[0056] Add 100g of EPDM rubber into a 0.2L internal mixer, and add 50g of flake graphite crystals prepared in the above step (1), start the machine, and after banburying for 20min at a speed of about 40rpm, take it out, and turn it into a double mixer with a speed of about 20rpm. The roller mill continued to mix, and added 10ml of g...

Embodiment 3

[0063] (1) Beneficiation and enrichment of flake graphite

[0064] Put 100g flake graphite raw ore with a diameter of less than 1.0mm into a ball mill, add water to make 1 liter of slurry, add 500g of zirconia ceramic balls with a diameter of 5mm, 0.8mL of gear oil, 0.2mL of soybean oil, 0.5g of polyethylene glycol and 0.5g sodium dodecyl sulfonate, ball mill speed 1000rpm, after grinding for 150min, pour it into the flotation cell of the flotation machine for flotation, scrape off the upper layer of foam, dehydrate and dry to obtain high-purity flake graphite crystals.

[0065] (2) Hydroxyl-terminated nitrile rubber exfoliated flake graphite crystal

[0066] Add 100g of hydroxy-terminated nitrile rubber into a 0.2L internal mixer, and add 15g of flake graphite crystal powder prepared in the above step (1) at the same time, start the machine at a speed of about 40rpm for banburying for 5min, take it out, and turn it into a speed of about 20rpm The two-roll mill continues mixi...

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Abstract

The invention relates to a method for preparing graphene by mechanically driving rubber molecules to strip flake graphite. According to the method, rubber and the flake graphite are mixed, a synergistic effect is achieved through an internal mixer and a double-roller open mill, the surface of the flake graphite is wetted with the combination of a wetting agent, and the flake graphite is promoted to be rapidly stripped into the graphene of a single-layer or few-layer structure; solvent dissolution, impurity removal, solid-liquid separation, washing and vacuum drying are carried out, and the high-quality graphene is obtained; or graphene composite rubber blocks are roasted, so that rubber components are carbonized and decomposed, and the remaining substance is the graphene. According to the method, a composite rubber block with the graphene content of 31% can be obtained; strong acid, strong alkali, strong oxidants and hypertoxic substances are not used in the process, and the prepared graphene has the advantages of being high in purity, good in thermal conductivity and electrical conductivity and the like, and has few defects.

Description

technical field [0001] The invention relates to a method for preparing high-quality graphene by using mechanically driven rubber molecules to peel off flake graphite crystals, and belongs to the field of preparation of new nanometer materials. Background technique [0002] Graphene is carbon atoms with sp 2 A single layer of hexagonal honeycomb structure formed by hybrid orbital connections, and a planar crystallized film composed of 2-10 layers of few layers of carbon atoms. The theoretical thickness of single-layer graphene is only 0.35nm, and the specific surface area is 2.63×10 3 m 2 / g, the Young's modulus is as high as ~1.0 TPa, and the strength is 130 GPa, which is 100 times that of steel, and it is the material with the highest strength known. Graphene has a thermal conductivity of ~5000 W / mK, a light transmittance of ~97.7%, and an electron mobility of 2×10 5 cm 2 / vs. Graphene's unique 2D structure, excellent mechanical, electrical, optical, thermal, and magn...

Claims

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Application Information

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IPC IPC(8): C01B32/19
CPCC01B32/19C01B2204/30
Inventor 汤庆国刘乃旭梁秀红梁金生
Owner HEBEI UNIV OF TECH
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