Preparing methods for modified graphene and modified graphene slurry

A graphene and modification technology, applied in the field of materials, can solve problems such as toxicity, limit the application of graphene, unfavorable environment and sustainable development of human beings, achieve simple process, realize large-scale industrial production, and require low process equipment Effect

Active Publication Date: 2019-07-05
GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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Problems solved by technology

However, due to the strong π-π interaction and van der Waals force between layers, graphene tends to agglomerate very easily, and the excellent performance of graphene is related to the number of layers; in addition, graphene can only disperse In a few extremely polar solvents, and most of these solvents are toxic, which is not conducive to the sustainable development of the environment and people, which greatly limits the application of graphene

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  • Preparing methods for modified graphene and modified graphene slurry
  • Preparing methods for modified graphene and modified graphene slurry
  • Preparing methods for modified graphene and modified graphene slurry

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preparation example Construction

[0022] A preparation method of modified graphene, comprising the following steps:

[0023] (1) Preparation of graphene oxide: graphite powder is oxidized by pre-oxidation and Hummer's method to obtain graphene oxide;

[0024] (2) Evenly disperse graphene oxide in water at a concentration of 5g / L-15g / L, adjust the pH to alkaline, add carboxyl activator at 70-90°C, stir; add branched polyethyleneimine aqueous solution, Reaction; the molecular weight of the branched polyethylenimine is 1000-3000;

[0025] (3) Add an alkaline reducing agent to the reaction solution in step (2), and after the reaction, filter, wash, and dry to obtain modified graphene.

[0026] The present invention uses branched polyethyleneimine, which can increase the steric hindrance between the modified graphene sheet and the sheet, and effectively prevent the agglomeration of the modified graphene due to the van der Waals force, and finally make the prepared modified graphene Graphene has good dispersibilit...

Embodiment 1

[0051] (1) Firstly, graphene oxide was prepared by pre-oxidizing and Hummer's oxidation using 325-mesh natural flake graphite powder.

[0052] (2) Take 1 g of the above-mentioned graphite oxide and add it into 100 ml of deionized water, and disperse by ultrasonic for 1 hour to obtain a dispersion liquid with a concentration of 10 g / L. Slowly add 0.1 mol / L NaOH aqueous solution dropwise to adjust the pH of the above dispersion to 8. Then, under the condition of a water bath at 80° C., 50 ml of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide salt solution with a concentration of 10 g / L was added and stirred for 30 min. Finally, 3 g of polyethyleneimine with a molecular weight of 1800 was dissolved in 100 ml of deionized water to prepare a polyethyleneimine solution with a concentration of 30 g / L, added to the above solution, and stirred for 2 hours. At this point, the solution turned from yellow to black.

[0053] (3) The above solution was raised to 100° C., then 20 ml of hydra...

Embodiment 2

[0056] (1) Firstly, graphene oxide was prepared by pre-oxidizing and Hummer's oxidation using 325-mesh natural flake graphite powder.

[0057] (2) Take 1 g of the above-mentioned graphene oxide and add it to 100 ml of deionized water, and disperse it by ultrasonic for 1 hour to obtain a uniform dispersion with a concentration of 10 g / L. Slowly add 0.1 mol / L NaOH aqueous solution dropwise to adjust the pH of the above dispersion to 9. Then, under the condition of a water bath at 70° C., 50 ml of an aqueous dicyclohexylcarbodiimide solution with a concentration of 8 g / L was added and stirred for 30 min. Finally, 3 g of polyethyleneimine with a molecular weight of 1800 was dissolved in 100 ml of deionized water to prepare a polyethyleneimine solution with a concentration of 30 g / L, added to the above solution, and stirred for 2 hours. At this point, the solution turned from yellow to black.

[0058] (3) The above solution was raised to 100° C., then 20 ml of hydrazine hydrate w...

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Abstract

The invention relates to preparing methods for modified graphene and modified graphene slurry. The preparing method for the modified graphene includes (1) a step of preparing graphene oxide, namely astep of subjecting graphite powder to preoxidation and Hummer's oxidation to obtain the graphene oxide; (2) a step of uniformly dispersing the graphene oxide into water in a concentration of 5 g/L to15 g/L, adjusting the pH until the solution is alkaline, adding a carboxyl activator at 70-90 DEG C, stirring the mixture, adding an aqueous solution of branched polyethyleneimine, and reacting the mixture, with the molecular weight of the branched polyethyleneimine being 1,000-3,000; (3) a step of adding an alkaline reductant into the reaction solution of the step (2), performing filtration afterthe reaction is finished, and cleaning and drying a product to obtain the modified graphene. The modified graphene prepared by the method can be uniformly and stably dispersed into water and ethanolwhich are common organic and inorganic solvents.

Description

technical field [0001] The invention relates to the field of materials, in particular to a method for preparing modified graphene and modified graphene slurry. Background technique [0002] Graphene (Graphene) is made of sp 2 The two-dimensional honeycomb crystal structure formed by the close arrangement of hybridized carbon atoms belongs to graphite materials. It has excellent Young's modulus (1100GPa), high thermal conductivity (about 5000J·(m·K·s) -1 ), high carrier mobility (2×10 5 cm 2 ·(V·s) -1 ) and high specific surface area (theoretical calculation value 2630m 2 g -1 ), as well as the quantum Hall effect and quantum tunneling effect, as well as excellent impermeability, etc., making it have great application prospects in the fields of electronic devices, composite materials and functional coatings. However, due to the strong π-π interaction and van der Waals force between layers, graphene tends to agglomerate very easily, and the excellent performance of grap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/194C01B32/198
CPCC01B32/184C01B32/194C01B32/198
Inventor 张双红杨波黄仕钰李茂东孔纲李爽翟伟王志刚李悦
Owner GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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