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Stable graphene oxide aqueous dispersion liquid and preparation method thereof

A graphene and dispersion technology, applied in the field of graphene oxide water dispersion and preparation thereof, can solve the problems of complex process flow, insufficient stability, inconvenient operation, etc., and achieve the effects of short process flow, convenient operation and low cost

Inactive Publication Date: 2015-09-02
NANTONG TEXTILE & SILK IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the process for preparing graphene oxide aqueous dispersion in the prior art usually faces disadvantages such as complex process flow and inconvenient operation, and the prepared graphene oxide dispersion system is not stable enough and easy to delaminate

Method used

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  • Stable graphene oxide aqueous dispersion liquid and preparation method thereof
  • Stable graphene oxide aqueous dispersion liquid and preparation method thereof
  • Stable graphene oxide aqueous dispersion liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Add 2 parts of sodium hydroxide to 50 parts of deionized water and mix evenly, then add 1 part of the surfactant tetradecyl dimethyl benzyl ammonium chloride, continue to stir evenly, and then add another 0.4 part The expanded graphite is stirred uniformly, and then ultrasonically dispersed for 1 hour. The dispersed graphite is transferred into the autoclave and treated at 230°C and 30 atm for 10 hours. The expanded graphene dispersion is taken out from the autoclave, and then washed and adjusted to a pH of 9 -12 is filtered, separated and dried to obtain graphene oxide. Add 0.2 parts of graphene oxide to cationic quaternary ammonium salt modified chitosan (cationic quaternary ammonium salt 15% molar percentage) in a 1.5% aqueous solution with a volume of 20 parts, and ultrasonically disperse for 1 hour to obtain a graphene oxide dispersion The composition of the graphene oxide dispersion liquid is graphene oxide, deionized water and cationic quaternary ammonium salt mod...

Embodiment 2

[0051] Add 4 parts of sodium hydroxide to 50 parts of deionized water and mix evenly, then add 1 part of the surfactant cetyltrimethylammonium chloride, continue to stir evenly, and then add another 0.5 part of swelling Stir the graphite evenly, then ultrasonically disperse it for 1 hour, transfer the dispersed graphite into the autoclave, disperse it at 230°C and 35atm for 10 hours, take out the expanded graphene dispersion from the autoclave, then wash and adjust the PH value After 9-12, filtered and dried to obtain graphene oxide. Add 0.2 parts of graphene oxide to the copolymer of methacrylamidopropyltrimethylammonium chloride and hydroxyethyl methacrylate (a cationic quaternary ammonium salt monomer) The repeating unit mole percentage is 23%) in a concentration of 1.5%, 20 parts by volume of aqueous solution, ultrasonic dispersion for 1 hour to obtain a graphene oxide aqueous dispersion, the graphene oxide dispersion is composed of graphene oxide, deionized water and methyl...

Embodiment 3

[0055] Add 3.5 parts of sodium hydroxide to 50 parts of absolute ethanol and mix evenly, then add 1.5 parts of surfactant cetyltrimethylammonium chloride, continue to stir evenly, and then add 0.7 parts of Expand the graphite and stir uniformly, then ultrasonically disperse for 1 hour, move the dispersed graphite into the autoclave, disperse it at 210℃ and 40atm for 8 hours, take out the expanded graphene dispersion from the autoclave, then wash and adjust the PH value After 9-12, it is separated by filtration and dried to obtain graphene oxide. Add 0.2 parts of graphene oxide to cationic quaternary ammonium salt modified chitosan (cationic quaternary ammonium salt 15% molar percentage) in a 1.5% aqueous solution with a volume of 20 parts, and ultrasonically disperse for 1 hour to obtain a graphene oxide dispersion The composition of the graphene oxide dispersion liquid is graphene oxide, deionized water and cationic quaternary ammonium salt modified chitosan, and the graphene ...

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Abstract

The invention discloses stable graphene oxide aqueous dispersion liquid and a preparation method of the stable graphene oxide aqueous dispersion liquid. The preparation method comprises the following steps: (1) sequentially mixing a certain amount of deionized water, inorganic base and an organic solvent, adding a surfactant and further uniformly mixing; (2) further adding expanded graphite, uniformly stirring and ultrasonically dispersing; (3) performing treatment on the obtained dispersion liquid at a certain temperature under a certain pressure; (4) taking out the treated dispersion liquid, and washing and neutralizing the dispersion liquid until a pH value is 9-12, performing filtering separation and drying to obtain graphene oxide powder; and (5) adding the graphene oxide into a cationic quaternary ammonium salt copolymer aqueous solution and performing ultrasonic dispersion so as to obtain the stable graphene oxide aqueous dispersion liquid. According to the stable graphene oxide aqueous dispersion liquid and the preparation method thereof, the deionized water, the organic base and the organic solvent are used as an expanded graphite stripping system and high-temperature high-pressure treatment is carried out, so that the expanded graphite is fully stripped; due to the cationic quaternary ammonium salt copolymer aqueous solution with high water solubility, the graphite dispersion system is stably stored. The stable graphene oxide aqueous dispersion system and the preparation process thereof have the advantages of short process, convenience in operation and high storage stability, and can be widely applied to capacitance films, adsorption separation materials, enhancement of polymer and the like.

Description

Technical field [0001] The invention relates to a stable graphene oxide aqueous dispersion and a preparation method thereof, and belongs to the field of nano material preparation. Background technique [0002] The preparation of nanomaterials can be divided into two categories: physical methods and chemical methods. Physical method can be divided into crushing method and construction method; while chemical method is divided into gas phase reaction method and liquid phase reaction method. The invention provides a method for preparing nanomaterials by stripping layered structural materials by a hydrothermal liquid phase reaction method. Hydrothermal originates from geology describing the reaction process of water in the earth's crust under the combined action of pressure and temperature. Hydrothermal method is a kind of organic or inorganic solvent in a closed container resistant to acid and alkali and high temperature and pressure. In a high temperature environment, a high tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 朱新生艾丽刘健黄然龚剑兵孟凯
Owner NANTONG TEXTILE & SILK IND TECH RES INST
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