Preparation method of graphene microsheets with controllable size

A graphene micro-chip size technology, applied in the direction of graphene, nano-carbon, etc., can solve the problems that graphene micro-chips cannot be controlled in size and cannot be mass-produced

Active Publication Date: 2016-08-17
XIAMEN KNANO GRAPHENE TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method cannot be produced on a large scale, and the prepared graphene microsheets cannot be sized.

Method used

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  • Preparation method of graphene microsheets with controllable size
  • Preparation method of graphene microsheets with controllable size

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Experimental program
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Effect test

Embodiment approach

[0030] The invention discloses a method for preparing a size-controllable graphene microsheet, the specific steps of which are as follows:

[0031] Step 1. High-temperature expanded acidified graphite: use acidified graphite with high expansion ratio as raw material, expand it at high temperature to prepare expanded graphite; the acidified graphite raw material size used here can be 1-8000 μm, preferably graphite raw material size ≥ 150 μm; the expansion temperature used can be 100-1500°C, preferably the expansion temperature is ≥800°C.

[0032] Step 2. Organic matter intercalation expanded graphite: use organic matter as intercalation matter and adopt a certain blending method to prepare expanded graphite / organic matter composite material; this organic matter is intercalated, combustible and can make the expanded graphite form before entering the pulverizer block, when a mixture is used, the mixing ratio of each component in the mixture is any ratio; one or more of saturated ...

Embodiment 1

[0037] The large-scale preparation of size-controllable graphene by combustion method is realized through the following steps:

[0038] Step 1. High-temperature expanded acidified graphite: using 180 μm acidified graphite as raw material, expand it at 800° C. to prepare expanded graphite;

[0039] Step 2, organic intercalation expanded graphite: using polystyrene as an intercalation material, adopting a melt blending method to prepare expanded graphite / polystyrene composite material;

[0040] Step 3, the pulverizer refines the composite material: using an ultrafine pulverizer, the expanded graphite / polystyrene composite material is pulverized into a 40 μm expanded graphite / organic fine powder;

[0041] Step 4. Combustion of expanded graphite / organic fine powder: In an air atmosphere and at a temperature of 800°C, polystyrene is burned to generate a large amount of energy, and the expanded graphite is exfoliated into a graphene micro-sheet powder of ≤40 μm.

Embodiment 2

[0043] The large-scale preparation of size-controllable graphene by combustion method is realized through the following steps:

[0044] Step 1. High-temperature expanded acidified graphite: using 300 μm acidified graphite as raw material, expand it at a temperature of 1000° C. to prepare expanded graphite;

[0045] Step 2, organic matter intercalation expanded graphite: using nylon 6 as the intercalation material, adopting a melt blending method to prepare expanded graphite / nylon 6 composite material;

[0046] Step 3, the pulverizer refines the composite material: using an ultrafine pulverizer, pulverize the solid blend into 10 μm expanded graphite / nylon 6 fine powder;

[0047]Step 4. Combustion of expanded graphite / nylon 6 fine powder: In an air atmosphere and at a temperature of 800°C, nylon 6 is burned at a high temperature to generate a large amount of energy, and the expanded graphite is exfoliated into graphene microflake powder of ≤10 μm.

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Abstract

The invention discloses a method for preparing graphene microflakes with high specific surface area and controllable size, which is suitable for mass production of graphene. Expanded graphite with high expansion ratio; (2) Using organic matter as an intercalation substance, blending and inserting into expanded graphite sheets to prepare expanded graphite / organic compound materials; (3) Using a pulverizer to crush the blend into a certain size; ( 4) Burn at high temperature in a certain atmosphere, expand and peel off to obtain graphene microflakes of a certain size. The invention can prepare size-controllable graphene microchip powder in batches and at low cost, and solves the problems of low yield, small size and high cost in the existing graphene preparation technology.

Description

technical field [0001] The invention relates to a preparation technology of graphene microchips, in particular to a preparation method of size-controllable graphene microchips, which is suitable for the macro-scale preparation of graphene microchips. Background technique [0002] Graphene refers to a planar crystalline material with a graphitic carbon six-membered ring conjugated structure. It is the only two-dimensional free atomic crystal discovered so far. Due to its special nanostructure and excellent physical and chemical properties, it has been shown in many fields such as biomedicine, catalysis, energy storage electronics, optics, magnetism, and sensors. It has great application potential and has received extensive attention and research from the scientific and industrial circles. [0003] Graphene microflakes generally refer to ultra-thin graphene layered stacks with more than 10 carbon layers and a thickness in the range of 5-100 nanometers. Compared with ordinary...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04C01B32/19
Inventor 赵立平洪江彬江龙迎方崇卿邱淑璇
Owner XIAMEN KNANO GRAPHENE TECH CORP
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