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A method for large-scale continuous preparation of graphene precursors and graphene precursors

A technology of graphene and precursors, applied in the field of large-scale continuous preparation of graphene precursors, methods and precursors, which can solve the problems of not having the characteristics of other organic compounds, being unable to meet diversified industrial uses, and being inconvenient to use, etc. Achieve the effect of broad market application, low cost, and prevent agglomeration

Active Publication Date: 2018-01-02
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the graphene obtained by direct exfoliation without redox is extremely easy to agglomerate because it is at the nanometer level, which is not only unstable in storage, but also inconvenient to use.
[0006] In the prior art, graphene has been prepared into an aqueous solution to prevent its agglomeration, but its aqueous solution does not have the material properties of other organic compounds and cannot meet diversified industrial uses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve sodium dodecylbenzenesulfonate used for graphene dispersion into pure water to prepare an aqueous solution with a mass fraction of 1%; heat the graphite raw material at 900°C for 10 seconds to obtain expanded graphite, and disperse the expanded graphite in In the sodium dodecylbenzenesulfonate aqueous solution, the expanded graphite dispersion that obtains is joined in the colloid mill, the expanded graphite added is ground and peeled off, and the weight ratio of expanded graphite and surfactant is 1:1, and the stripping time is After 3 hours, the obtained graphene solution and beeswax were added to the homogenizer, and the surface of the graphene was coated and fixed to prevent it from agglomerating. The weight ratio of the graphene to the beeswax was 1:20, and the fixed After the graphene solution immobilized by the solvent is suction-filtered and spray-dried, a large-grain graphene precursor composed of graphene is obtained.

Embodiment 2

[0032]Dissolve sodium lauryl sulfate used as graphene dispersion in pure water to prepare an aqueous solution with a mass fraction of 3%; heat the graphite raw material at 1000°C for 15 seconds to obtain expanded graphite, and disperse the expanded graphite in twelve In the aqueous solution of sodium alkylbenzenesulfonate, the expanded graphite dispersion obtained is added to the colloid mill, and the added expanded graphite is ground and peeled off. The weight ratio of expanded graphite to surfactant is 1:0.2, and the peeling time is 3 hours , the obtained graphene solution and palmitic acid are added to the homogenizer, and the graphene surface is surface-coated and fixed to prevent it from agglomerating. The weight ratio of the graphene to palmitic acid is 1:15, and the fixed After the graphene solution immobilized by the solvent is suction-filtered and spray-dried, a large-grain graphene precursor composed of graphene is obtained.

Embodiment 3

[0034] Dissolve sodium cetyl sulfonate used for graphene dispersion into pure water to prepare an aqueous solution with a mass fraction of 0.5%; heat the graphite raw material at 900°C for 10 seconds to obtain expanded graphite, and disperse the expanded graphite in ten In the aqueous sodium dialkylbenzenesulfonate solution, the expanded graphite dispersion obtained is added to the colloid mill, and the added expanded graphite is ground and peeled off. The weight ratio of expanded graphite to surfactant is 1:10, and the peeling time is 4 hour, will obtain the graphene solution and join in the homogenizer together with the polyacrylate copolymer, the graphene surface is carried out surface coating fixation, prevents it from agglomerating, the weight ratio of described graphene and polyacrylate copolymer is 1:30, the graphene solution immobilized by the fixative is suction-filtered, and then spray-dried to obtain a large-grained graphene precursor composed of graphene.

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Abstract

A method for large-scale continuous preparation of graphene precursors. Graphene is prepared by exfoliating graphite by continuous mechanical exfoliation, which protects the sheet structure of graphene and avoids the damage of graphene sheets to cause its performance to decline. During the exfoliation process Surfactants are added to prevent the graphene from agglomerating, and then a fixative is added to make the graphene surface-treated and coated and fixed during the preparation process, and the surface-treated graphene is dried to finally obtain a large graphene composition. Granular graphene precursor. The precursor can be dispersed into graphene by simple dissolution during application, and graphene precursors immobilized by lipophilic, lipophilic or hydrophilic fixatives can also be selected according to the solvent environment of its application. . The graphene precursor is not only stable in storage, but also convenient to use.

Description

technical field [0001] The invention relates to the technical field of graphene preparation, in particular to a method for large-scale continuous preparation of a graphene precursor and the precursor. Background technique [0002] Graphene is a single-layer two-dimensional crystal composed of carbon atoms bonded to each other through sp2 hybridization. It is the basic structural unit for constructing other dimensional carbon materials (zero-dimensional fullerenes, one-dimensional carbon nanotubes, and three-dimensional graphite). Since its discovery in 2004, it has generated enormous interest throughout the scientific community. Due to its unique chemical structure and geometric structure, it has broad application prospects in the fields of nanoelectronic devices, energy storage materials, catalysis, sensors, drug carriers, and functional composite materials. In the field of biomedicine, graphene and its composites offer exciting opportunities in a wide range of application...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19
Inventor 陈庆曾军堂廖大应陈兵
Owner CHENDU NEW KELI CHEM SCI CO LTD
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