Graphene fiber non-woven fabric and preparation method thereof

A technology of graphene fibers and non-woven fabrics, which is applied in the direction of graphene, spinning solution preparation, wet spinning, etc., can solve the problems of restricting electrical conductivity, thermal conductivity, graphene content cannot be high, and performance is limited. Easy batch preparation, simple method, good strength and toughness effect

Active Publication Date: 2016-12-07
杭州德烯科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the fabric obtained by the above method has improved performance to a certain extent with the addition of graphene, it is not a complete graphene fabric, and the graphene content cannot reach a higher level, and the performance of polymer materials with more content Limited, which restricts the acquisition of extremely high electrical and thermal conductivity
Fabrics made entirely of graphene fibers have not been reported so far

Method used

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  • Graphene fiber non-woven fabric and preparation method thereof
  • Graphene fiber non-woven fabric and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) A graphene oxide dispersion liquid with a concentration of 5 mg / mL is prepared, and the solvent is N, N-dimethylformamide, and it is used as a spinning solution.

[0030] (2) Make the spinning solution enter in the ethyl acetate coagulation liquid through the spinning tube with a diameter of 100 μm at an extrusion speed of 0.04mL / min, and control the coagulation bath rotation speed to be 100rpm, so that the length of the graphene short fiber is maintained at 20~ 40mm, soaked in the coagulation solution for 30 minutes, solidified into filaments, collected by vacuum filtration, placed at room temperature for 5 hours, and dried in vacuum at 60°C for 3 hours to obtain a film composed of graphene oxide fibers.

[0031] (3) The dried graphene oxide fiber film is redispersed in a water-ethanol mixture, wherein the volume ratio of water and ethanol used is shown in Table 1. It is determined through experiments that the optimum volume ratio is water:ethanol=3:1, so a suspens...

Embodiment 2

[0037] (1) Prepare a graphene oxide dispersion with a concentration of 6 mg / mL, and use N, N-dimethylformamide as a solvent as a spinning solution.

[0038] (2) Make the spinning solution enter in the ethyl acetate coagulation solution through the spinning tube of 200 μm with the extrusion speed of 0.06mL / min, and control the coagulation bath rotation speed to be 120rpm, so that the length of the graphene short fiber is maintained at 20~ 40mm, soaked in the coagulation solution for 200min, solidified into filaments, collected by vacuum filtration, placed at room temperature for 30h, and vacuum-dried at 60°C for 3h to obtain a film composed of graphene oxide fibers.

[0039] (3) The dried graphene oxide fiber film is redispersed in a mixed solution of water and ethanol with a volume ratio of 1:2 to obtain a suspension of graphene oxide short fibers, which is filtered and deposited through a gauze with a pore size of 500 μm, and washed with ethanol Three times, drying at 80° C. ...

Embodiment 3

[0043] Step 1 is the same as in Example 1.

[0044] Step 2 is: the spinning solution enters the coagulation solution through a spinning tube with a diameter of 200 μm at an extrusion speed of 10 mL / min, enters the ethyl acetate coagulation solution, and controls the rotation speed of the coagulation bath to be 200 rpm so that the length of the graphene short fiber Keep it at 20-40 mm, soak in the coagulation solution for 60 minutes, solidify into filaments, collect by vacuum filtration, leave at room temperature for 20 hours, and vacuum dry at 60°C for 3 hours to obtain a film composed of graphene fibers.

[0045] Steps 3 and 4 are the same as in Example 1.

[0046] After the above steps, the width of the graphene short fibers that make up the graphene fiber non-woven fabric is 60-200 μm, and the density of the non-woven fabric is about 0.21mg / cm 3 , the overall tensile strength is 0.7-0.9MPa, the elongation at break is 2.2%-3.5%, has good toughness, and the electrical conduc...

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Abstract

The invention discloses a graphene fiber non-woven fabric and a preparation method thereof. The non-woven fabric is obtained by filtering and depositing a graphene short-fiber dispersion solution through a filter net and performing drying and reduction, so that the structural unit of the non-woven fabric is disorderly-stacked and bonded graphene short fiber, and fiber is overlapped to form a large number of holes through which liquid of gas can pass. The graphene fiber non-woven fabric has the good mechanical strength and tenacity, is completely composed of graphene fiber, does not contain high polymer materials as a skeleton or adhesives, the electricity and heat conducting performance of the reduced network structure overlapped by the graphene fiber is excellent, and the non-woven fabric can be used as a multifunctional high-performance fabric.

Description

technical field [0001] The invention relates to a graphene fabric, in particular to a non-woven fabric made of graphene fibers and a preparation method thereof. Background technique [0002] Graphene is an allotrope of carbon with only a single atomic layer thickness, which has the highest strength, high thermal conductivity and carrier mobility in known materials, so since it was reported by Geim et al. in 2004 (Science , 2004, 306:666-669), which has attracted great attention. Graphene fiber is an assembled structure of two-dimensional graphene sheets on a one-dimensional macroscopic scale, which exhibits high strength and extremely high electrical and thermal conductivity. This macroscopic material benefits from the excellent properties of graphene itself. , so it has great potential and value. One of the strategies to push graphene fibers further toward practical applications is to weave them to obtain functional fabrics with certain flexibility, high electrical conduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/4242D01F9/12
CPCD01F9/12D04H1/4242C01B32/192D01D1/02D01D5/06D01D7/00D01D10/02D04H1/70D04H3/002C01B32/182D01F11/10D04H1/724
Inventor 高超李拯
Owner 杭州德烯科技集团有限公司
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