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Graphene organic size and preparation method thereof

A technology of graphene and organic pulp, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as difficult to disperse graphene organic pulp, achieve uniform heating, reduce production costs, and ingenious process design Effect

Active Publication Date: 2016-11-16
THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although graphene can be used as a raw material to obtain a higher concentration of graphene organic slurry, it is difficult to obtain highly dispersed graphene organic slurry by means of physical dispersion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Disperse 1g of graphite oxide in 99g of water, and treat it at high speed at 1500rpm for 60min to obtain a uniformly dispersed aqueous solution of graphene oxide; dissolve 0.005g of sodium dodecylbenzenesulfonate and 0.01g of octadecylamine in 100g of DMF, and Add 15g of toluene after the graphene aqueous solution and DNF are mixed and stirred evenly. Transfer the above GO mixed solution to the water separation and reflux device, heat the mixed solution to 120°C, the toluene and water azeotrope, the steam condenses into the water separator, the toluene is in the upper layer and the water is in the lower layer, and part of the toluene is guaranteed to pass through the water separator during the heating process. After collecting 90ml of water in the water separator, raise the temperature of the mixed solution to 150°C, evaporate the remaining water and water-carrying agent in the system, keep it for 30min, and end the distillation to obtain octadecylamine-modified Graphen...

Embodiment 2

[0030] Disperse 1g of graphite oxide in 99g of water, and process it at 1500rpm at high speed for 60min to obtain a uniformly dispersed aqueous solution of graphene oxide; dissolve 0.05g of sodium dodecylbenzenesulfonate in 100g of DMF, and mix the aqueous solution of graphene oxide with DMF After stirring evenly, 15 g of toluene was added. Transfer the above GO mixed solution to the water separation and reflux device, heat the mixed solution to 100°C, the toluene and water azeotrope, the steam condenses into the water separator, the toluene is in the upper layer and the water is in the lower layer, and part of the toluene is guaranteed to pass through the water separator during the heating process. After collecting 90ml of water in the water separator, increase the temperature of the mixed solution to 150°C, evaporate the remaining water and water-carrying agent in the system, add silane coupling agent KH560, keep for 30min, and end the distillation , to obtain KH560 modified...

Embodiment 3

[0032] Disperse 5g of graphite oxide in 495g of water, and process it at 1500rpm at high speed for 60min to obtain a uniformly dispersed aqueous solution of graphene oxide; dissolve 0.25g of polyvinylpyrrolidone in 100g of NMP, mix and stir the aqueous solution of graphene oxide and NMP evenly, and partly The mixed solution was transferred to the flask of the distillation device, and the above-mentioned remaining GO mixed solution was placed in the dropping funnel, and continued to be added dropwise during the distillation process at 120 °C. After no more water was collected in the distillation head, the temperature was raised to 180 °C. Keep for 30min, end the distillation, and add molecular sieves to the NMP slurry, after standing for 72h, filter and remove the molecular sieves to obtain graphene NMP slurry.

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Abstract

The invention discloses a preparation method of graphene organic size. The preparation method includes: utilizing a graphene oxide water solution as a raw material; subjecting the raw material and an organic solvent with a dispersant dissolved in to liquid-liquid mixing and homogenizing; removing water in the solvent while performing reduction to obtain the graphene organic size. Conventional ideas are broken through, high dispersity of GO (graphene oxide) in water is utilized to bring a non-stacked state of GO in water into an organic phase, reduction of graphene oxide is realized synchronously in the process of solvent replacement, and finally the graphene organic size which is high in concentration and dispersity can be obtained; process design is ingenious, and production cost can be lowered effectively. In addition, content of graphene in the graphene organic size obtained by the preparation method can reach higher than 0.05wt%, and the graphene organic size does not settle after being placed at normal temperature for 30 days. Graphene oxide is reduced in the process of heating, distilling and dewatering, in this case, graphene is heated uniformly, and reductive effect is better at same temperature; under a heating condition of 150 DEG C, reductive degree can reach below 20wt% in oxygen content.

Description

technical field [0001] The invention relates to a slurry in which graphene is dispersed in an organic solvent and a preparation process thereof, belonging to the technical field of graphene dispersion. Background technique [0002] At present, there are two main methods for preparing graphene organic slurry: one is to use liquid phase exfoliation to directly obtain graphene organic slurry from graphite, which has a complete graphene structure and high quality, but the method has a low yield and cannot obtain high Concentrated graphene slurry is not conducive to industrial scale use. The second is to use the redox method to obtain graphene powder, and then modify graphene in the later stage, or add surfactants, and obtain graphene organic slurry through high-speed stirring, emulsification or ultrasonic dispersion processes. This method uses graphene powder as a raw material, but in the process of preparing graphene powder from graphene oxide reduction, graphene will inevitab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01B2204/04
Inventor 葛明马宇飞王炳霁瞿研
Owner THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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