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Self-fused reduced graphene fiber paper and preparation method thereof

A graphene fiber and fiber paper technology, which is applied in the direction of synthetic cellulose/non-cellulose material pulp/paper, fiber raw material processing, papermaking, etc., can solve the problem of difficult wet assembly, inability to swell, and reduced oxygen content of graphene fibers Functional groups and other issues, to achieve the effect of controllable thickness and simple preparation method

Inactive Publication Date: 2019-01-25
HANGZHOU GAOXI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reduced graphene fibers have fewer oxygen-containing functional groups and cannot be swollen in solution, so it is difficult to wet-assemble them by conventional means.
The work of wet self-fusion of reduced graphene fibers to obtain thin films has not been reported before

Method used

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  • Self-fused reduced graphene fiber paper and preparation method thereof
  • Self-fused reduced graphene fiber paper and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0019] The preparation methods of reduced graphene two-dimensional film-like materials are generally divided into one-step method and two-step method, respectively, using a reduced graphene solution to directly deposit a film, or reducing a graphene oxide film. However, conventional preparation methods all have corresponding deficiencies. For the one-step method, since the functional groups of the reduced graphene are less, the dispersibility of the reduced graphene in the solvent is poor, especially when the concentration is higher than a certain level, and its dispersibility is even worse, thus greatly increasing the direct obtainment of a certain amount. Difficulty of film material with a high thickness; For the two-step method of film formation-reduction, it takes a long time to remove the solvent for film formation, often reaching several days. Bubbles are generated in the medium, which reduces the mechanical and electrical properties of the material.

[0020] The wet fu...

Embodiment 1

[0023] (1) The graphene oxide / N, N-dimethylformamide solution with a concentration of 6 mg / mL was used as the spinning solution, and ethyl acetate was used as the coagulation bath for continuous wet spinning.

[0024] (2) Place the obtained graphene oxide fiber at room temperature for 12 h, and then heat at 40° C. for 3 h.

[0025] (3) Soak the pretreated graphene oxide fibers in an aqueous solution, and use a hydrothermal kettle to perform hydrothermal treatment under the condition of 80° C. for 12 hours.

[0026] (4) Use a high-speed shear mixer to crush the reduced graphene fibers after the hydrothermal treatment into short fibers with a length of 5 mm to form a dispersion of the reduced graphene short fibers.

[0027] (5) Use vacuum filtration to deposit the reduced graphene fibers in the dispersion on the filter membrane, and as the fibers are dried, they can be fused together to obtain reduced graphene fiber paper.

[0028] After the above steps, the obtained self-fusio...

Embodiment 2

[0030] (1) The graphene oxide aqueous solution with a concentration of 8 mg / mL was used as the spinning solution, and the calcium chloride / water / ethanol mixture (mass ratio 20:300:100) was used as the coagulation bath for continuous wet spinning.

[0031] (2) Place the obtained graphene oxide fiber at room temperature for 12 h, and then heat at 80° C. for 3 h.

[0032] (3) Soak the pretreated graphene oxide fibers in an aqueous solution, and perform hydrothermal treatment in a hydrothermal kettle, and the treatment condition is 60° C. for 3 hours.

[0033] (4) Use a high-speed shear mixer to crush the reduced graphene fibers after the hydrothermal treatment into short fibers with a length of 4 mm to form a dispersion of the reduced graphene short fibers.

[0034] (5) Use vacuum filtration to deposit the reduced graphene fibers in the dispersion on the filter membrane, and as the fibers are dried, they can be fused together to obtain reduced graphene fiber paper.

[0035] Afte...

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Abstract

The invention discloses self-fused reduced graphene fiber paper and a preparation method thereof. The graphene fiber paper is prepared by carrying out wet fusion assembly on reduced graphene fibers, and has certain conductivity. The structural elements constituting the fiber paper establish a strong cohesive force by means of van der waals force, pi-pi interaction, and the like, so that the mechanical strength and good flexibility of the fiber paper are guaranteed; the thickness and microstructure of the filter paper can be easily controlled by means of pretreatment before fiber fusion, so that a flexible functional design is realized; the self-fused reduced graphene fiber paper can be applied to the fields such as energy storage devices, photothermal conversion devices and catalysis.

Description

technical field [0001] The invention relates to graphene fibers and membrane materials, in particular to a graphene fiber paper formed by wet fusion of reduced graphene fibers and a preparation method thereof. Background technique [0002] Graphene fiber is a one-dimensional macroscopic assembly composed of two-dimensional graphene sheets assembled in a certain orientation. Due to the unique properties of graphene at the nanometer scale and the strong interaction between graphene sheets, graphene fibers in Macroscopically, it exhibits strong mechanical properties and excellent electrical and thermal conductivity (Accounts of chemical research, 2014, 47(4): 1267-1276). Graphene oxide fibers are composed of graphene oxide sheets, and a large number of oxygen-containing functional groups endow the sheets with strong hydrophilicity. Therefore, strong hydrogen bonds can be established between fibers through the swelling-self-fusion method, so as to achieve Wet assembly of graphe...

Claims

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Application Information

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IPC IPC(8): D21H13/50D21H15/02D21J5/00
CPCD21H13/50D21H15/02D21J5/00
Inventor 高超李拯
Owner HANGZHOU GAOXI TECH CO LTD
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