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Method for preparing graphene in screw extruder through crystal form inducing

A screw extruder and screw extruder technology, applied in the field of graphene preparation, can solve the problems of difficulty in obtaining graphene, small size of graphene sheets, difficulty in peeling graphene, etc., and achieve continuous and stable preparation, complete layer structure, Avoid the effect of synthesis temperature

Inactive Publication Date: 2016-02-17
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the high-temperature graphitization of amorphous carbon will cause the particle size of the material to increase and the layer structure to be destroyed, it is difficult to exfoliate qualified graphene from this graphite.
[0009] According to the above, the sustainable development of the graphene industry can be achieved by preparing graphene from carbon sources through the "bottom-up method". Even graphite whose layer structure is destroyed is difficult to obtain graphene

Method used

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  • Method for preparing graphene in screw extruder through crystal form inducing
  • Method for preparing graphene in screw extruder through crystal form inducing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Melt 10kg of sucrose under heating, add 0.1kg of boric acid and 0.05kg of ammonium carbonate, and grind and disperse through a colloid mill for 25 minutes, so that boric acid and ammonium carbonate are evenly dispersed in the sucrose;

[0038] (2) Pump the grinding material obtained in step (1) into a twin-screw extruder rotating in the same direction. The length-to-diameter ratio of the screw extruder is set to 48 / 1, and the screw extruder moves from the feed end to the discharge end in turn. There are three parts: dispersion section, crystal form induction section, and shear stripping section. The dispersion section is composed of conveying thread elements, toothed thread elements, and 90° meshing thread elements. The crystal form induction section is composed of 90° meshing thread elements and compression thread elements. , the shearing and peeling section is all composed of 90° meshing thread elements; the temperature of the dispersion section is controlled at 12...

Embodiment 2

[0042] (1) Heat and melt 15kg of maltose to form a slurry, add 0.3kg of crystal form inducer boric acid and 0.15kg of ammonium bromide, and grind and disperse through a colloid mill for 10 minutes, so that the crystal form inducer is evenly dispersed in maltose, and ground material;

[0043] (2) Pump the grinding material obtained in step (1) into a co-rotating three-screw extruder, and the screw extruder is sequentially equipped with a dispersion section, a crystal form induction section, and a shear stripping section from the feed end to the discharge end Three parts, the temperature of the dispersion section is controlled at 150°C, the temperature of the crystal form induction section is set at 190°C, 220°C, and 250°C, and the temperature of the shearing and peeling section is 500°C. The screw extruder is produced under the condition of high-speed rotation of 1200rpm Shearing, directional extrusion of the grinding material into the dispersion section to disperse and activat...

Embodiment 3

[0046] (1) Heat and melt 10kg of lactose as a carbon source to form a slurry, add 0.3kg of crystal form inducers boric acid and 0.05kg of ammonium chloride, and grind and disperse through a colloid mill so that the crystal form inducers are evenly dispersed in the carbon source to obtain Abrasives;

[0047] (2) Pump the grinding material obtained in step (1) into a four-screw extruder rotating in the same direction. The screw extruder is sequentially equipped with a dispersion section, a crystal form induction section, and a shear peeling section from the feed end to the discharge end. Three parts, the dispersion section is composed of conveying thread elements, toothed thread elements, and 90° meshing thread elements, and the crystal formation induction section is composed of 90° meshing thread elements and compression thread elements. The reaction pressure is controlled at 3MPa by setting the compression thread , the shearing and stripping sections are all controlled by 90° ...

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Abstract

The invention provides a method for preparing graphene in a screw extruder through crystal form inducing. The method comprises the steps that shearing slicing is performed on a carbon source through the screw extruder, a crystal form inducing agent is utilized, the crystal form inducing agent generates a variant along with gradual increasing of the temperature to induce the carbon source to form crystals and enable the crystals to grow along layers, the layer structure of graphite is more obvious, the layer size of the graphite exceeds 1 mm, and finally the graphene is obtained through shearing stripping of the screw extruder. Accordingly, the defect of high-temperature long-time sintering of a catalyst used in the process of graphene preparation through the carbon source is overcome, therefore, the layer structure of the graphite is complete, and then the large-size graphene with the two-dimensional area is obtained. The method has the advantages that the technology is simple, the cheap and rich raw materials are used, a chemical reaction or high synthesizing temperature is effectively prevented from being adopted, and industrial production is achieved.

Description

technical field [0001] The invention relates to the field of graphene materials, in particular to a method for preparing graphene in a screw extruder by using crystal form induction. Background technique [0002] Graphene is a two-dimensional crystal composed of closely packed carbon atoms. It is a planar film of hexagonal honeycomb lattice composed of carbon atoms and hybrid orbitals. It is currently known to have the highest strength, the best toughness, and the lightest weight. The material with the highest light transmittance and the best conductivity. However, it is extremely difficult to obtain high-quality graphene. Even if high-quality graphene is obtained through existing technical means, the difficulty of mass production has become the key to hindering the development of the graphene industry. [0003] According to the source of graphene, it can be divided into two types at present: one is the "top-down method", which is to obtain graphene by layer-by-layer separa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 陈庆曾军堂叶任海陈兵
Owner CHENDU NEW KELI CHEM SCI CO LTD
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