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A method for preparing graphene by dry grinding and exfoliation

A graphene and graphite technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as easy agglomeration, and achieve the effect of reducing the introduction of grinding media, high purity and low cost

Active Publication Date: 2017-12-08
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem of easy agglomeration and the introduction of too many impurities in the current dry preparation of graphene, the present invention uses the differences in physical and chemical properties such as hardness, plasticity, and lubricity among different graphite types to make dense crystalline graphite , flake graphite, and cryptocrystalline graphite are mixed and ground according to different mass ratios, and polydimethylsiloxane is added during the grinding process to further promote the dispersion of graphene. The following technical scheme is adopted:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Choose dense crystalline graphite, natural flake graphite, and aphanitic graphite as graphite raw materials, with masses of 60g, 20g, and 20g respectively. Pour the three kinds of graphite into dilute hydrochloric acid and soak for 1 hour, then perform suction filtration, and deionized water Wash 3-5 times, and finally put the mixed graphite into a constant temperature oven and dry it at 90°C for later use;

[0031] Take by weighing 10g polydimethylsiloxane, dissolve it in 500ml xylene solvent, after it dissolves completely, the step Pour the mixed graphite in the xylene solution dissolved in polydimethylsiloxane and soak for 1h, then filter it, put it in a constant temperature drying oven without washing, and dry it at 120°C to obtain graphite-polydimethylsiloxane Silicone mixture;

[0032] Pour the graphite-polydimethylsiloxane mixture into a ball mill, and grind for 48 hours at a speed of 500 rpm to obtain a graphene product;

[0033] will step The graph...

Embodiment 2

[0035] Choose dense crystalline graphite, natural flake graphite, and aphanitic graphite as graphite raw materials, with masses of 20g, 60g, and 20g respectively. Pour the three kinds of graphite into dilute hydrochloric acid and soak for 1h, then perform suction filtration, and deionized water Wash 3-5 times, and finally put the mixed graphite into a constant temperature oven and dry it at 90°C for later use;

[0036] Take by weighing 10g polydimethylsiloxane, dissolve it in 500ml xylene solvent, after it dissolves completely, the step Pour the mixed graphite in the xylene solution dissolved in polydimethylsiloxane and soak for 1h, then filter it, put it in a constant temperature drying oven without washing, and dry it at 120°C to obtain graphite-polydimethylsiloxane Silicone mixture;

[0037] Pour the graphite-polydimethylsiloxane mixture into a ball mill, and grind for 48 hours at a speed of 500 rpm to obtain a graphene product;

[0038] will step The graphene ...

Embodiment 3

[0040] Choose dense crystalline graphite, natural flake graphite, and aphanitic graphite as graphite raw materials, with masses of 20g, 20g, and 60g respectively. Pour the three types of graphite into dilute hydrochloric acid and soak for 1 hour, then perform suction filtration, and deionized water Wash 3-5 times, and finally put the mixed graphite into a constant temperature oven and dry it at 90°C for later use;

[0041] Take by weighing 10g polydimethylsiloxane, dissolve it in 500ml xylene solvent, after it dissolves completely, the step Pour the mixed graphite in the xylene solution dissolved in polydimethylsiloxane and soak for 1h, then filter it, put it in a constant temperature drying oven without washing, and dry it at 120°C to obtain graphite-polydimethylsiloxane Silicone mixture;

[0042] Pour the graphite-polydimethylsiloxane mixture into a ball mill, and grind for 48 hours at a speed of 500 rpm to obtain a graphene product;

[0043] will step The graphe...

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Abstract

The invention provides a method for preparing graphene through dry grinding and stripping. According to the method for preparing the graphene through dry grinding and stripping, dense crystallized graphite, flake graphite and cryptocrystalline graphite are mixed according to a certain ratio; and because the dense crystallized graphite, the flake graphite and the cryptocrystalline graphite have different kinds of lubricity, hardness and plasticity, under the condition that polydimethylsiloxane is used as an assistant, graphite is rapidly stripped through dry direct grinding due to the different performances of the different kinds of graphite, and the stripping performance is high. Besides, through the dispersion lubricating feature of the polydimethylsiloxane, the structure of the obtained graphene layer is well preserved, and the grinding device can be a Raymond mill or a vertical mill or a ball mill.

Description

technical field [0001] The invention relates to the field of graphene materials, in particular to the preparation of high-purity graphene materials by dry grinding, and in particular to the use of different physical and chemical properties of different graphite types to solve the problem of graphene hard agglomeration in the dry state preparation process question. Background technique [0002] Due to its unique structure, graphene has excellent properties in many aspects, such as electronic properties, mechanical properties, mechanical properties, optical properties, thermal properties, etc. It is called the star of future materials. Graphene is the thinnest material found in the world so far. The thickness of a single layer is only 0.3354nm, but its specific surface area is as high as 2965m2 / g. Graphene is also currently the material with the highest mechanical strength in the world, with an elastic modulus as high as 1TPa, a tensile strength as high as 180GPa, and a break...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19
CPCC01B2204/32
Inventor 陈庆曾军堂陈兵王镭迪
Owner CHENDU NEW KELI CHEM SCI CO LTD
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