Preparation method of high-strength polyacrylonitrile nano-composite fiber

A nanocomposite fiber and polyacrylonitrile technology, which is applied in fiber treatment, fiber chemical characteristics, spinning solution preparation, etc., can solve the problems of low molecular orientation of PAN, low tensile strength and modulus of carbon fiber, and thermal stretching ratio. minor issues

Inactive Publication Date: 2015-06-10
NANTONG QIANGSHENG GRAPHENE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The domestic production of polyacrylonitrile precursors for carbon fibers adopts the wet spinning method. The biggest advantage of this method is that the production process is simple, the cost of the produced carbon fibers is low, the molecular defects of the obtained PAN are small, and the emissions during the pre-oxidation process are relatively small. The therma

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  • Preparation method of high-strength polyacrylonitrile nano-composite fiber
  • Preparation method of high-strength polyacrylonitrile nano-composite fiber

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Embodiment 1

[0033] This embodiment provides a method for preparing high-strength polyacrylonitrile nanocomposite fibers, the preparation method comprising the following steps:

[0034] Graphene oxide was added to a mixed solvent containing dimethyl sulfoxide (DMSO): water = 95: 5, and ultrasonically dispersed for 1 h. Add polyacrylonitrile with a molecular weight of 88,000 to the mixed solvent, stir and dissolve at 50°C for 2 hours. The weight percentage of graphene oxide is 0.3%, and the weight percentage of polyacrylonitrile is 30%;

[0035] Degassing at normal pressure for 8 hours, the degassing temperature is 30°C, and the temperature of the spinning stock solution is 30°C. After filtering, it enters the 60 / 40 (V / V) DMSO / water at -10°C through a spinneret with an aperture of 0.10mm. In the coagulation bath, the primary fibers in jelly state are formed;

[0036]The jelly fibers were stretched and extracted in a methanol bath at -20°C to remove dimethyl sulfoxide; the extraction time ...

Embodiment 2

[0039] This embodiment provides a method for preparing high-strength polyacrylonitrile nanocomposite fibers, the preparation method comprising the following steps:

[0040] The electrochemically exfoliated graphene was added to a mixed solvent containing dimethylformamide: water = 70: 30, and ultrasonically dispersed for 2 hours. Add polyacrylonitrile with a molecular weight of 50,000 to the mixed solvent, stir and dissolve at 80° C. for 2 hours; the weight percentage of graphene oxide is 0.05%, and the weight percentage of polyacrylonitrile is 15%;

[0041] Degassing at normal pressure for 6 hours, the degassing temperature is 50°C, and the temperature of the spinning stock solution is 50°C. After filtration, the spinneret with an aperture of 0.25mm enters the 60 / 40 (V / V) dimethyl In the coagulation bath of formamide / water, the as-spun fibers of jelly state are formed;

[0042] The jelly fiber was stretched and extracted in a methanol bath at 60°C to remove dimethyl sulfoxid...

Embodiment 3

[0045] This embodiment provides a method for preparing high-strength polyacrylonitrile nanocomposite fibers, the preparation method comprising the following steps:

[0046] Amino-modified graphene oxide was added to the solution of sodium thiocyanate, ultrasonically dispersed for 4 hours; polyacrylonitrile with a molecular weight of 120,000 was added to the mixed solvent, and stirred and dissolved at 80°C for 2 hours; the modified graphene The weight percentage is 10%, and the weight percentage of polyacrylonitrile is 25%;

[0047] Degassing under normal pressure for 8 hours, the degassing temperature is 80°C, and the temperature of the spinning stock solution is 80°C; after filtering, it enters the 60 / 40 (V / V) distilled water coagulation bath at -5°C through a spinneret with an aperture of 0.06mm In the process, the primary fibers in jelly state are formed;

[0048] The jelly fibers were stretched and extracted in a methanol bath at 30°C to remove the solvent; the extraction...

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Abstract

The invention discloses a preparation method of high-strength polyacrylonitrile nano-composite fiber. The preparation method comprises the following steps: 1, feeding graphene into an organic solvent or a mixed solution of the organic solvent and water, evenly dispersing, feeding homopolymer or copolymer of acrylonitrile, and dissolving at the temperature of 30-120 DEG C to obtain a spinning solution; or directly mixing the homopolymer or copolymer of acrylonitrile with graphene, and then dispersing the mixture into concentrated acid or a water solution of inorganic salt to obtain the spinning solution; 2, filtering the spinning solution at the temperature of 20-80 DEG C, defoaming, and spraying the deformed spinning solution into a coagulating bath with the temperature of -40 to 5 DEG C by a spinneret plate to form nascent fiber; 3, extracting the nascent fiber, drying, and carrying thermal stretch and heat setting to obtain the high-strength polyacrylonitrile nano-composite fiber. The preparation method is simple in production technology, high in product performance and easy in realization of industrial mass production.

Description

technical field [0001] The invention relates to a preparation method of high-strength polyacrylonitrile nanocomposite fibers. Background technique [0002] Carbon widely exists in nature and is one of the basic elements that constitute living organisms. Graphene, as a new carbonaceous material, consists of a dense layer of carbon atoms wrapped in a honeycomb crystal lattice with sp 2 The monoatomic layer composed of hybrid connections is the basic unit of other carbon allotropes. It can be folded into zero-dimensional fullerenes, curled into one-dimensional carbon nanotubes, and stacked into three-dimensional graphite and diamonds. , has excellent crystallinity, electrical quality and excellent mechanical properties. Graphene has high strength and performance comparable to diamond. The measured tensile strength and elastic modulus are 125GPa and 1.1T Pa respectively. Graphene flakes have only one atomic layer Thick (0.335nm), only 1 / 200,000th of hair, is the thinnest and h...

Claims

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Application Information

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IPC IPC(8): D01F6/54D01F1/10D01D5/06D01D1/02D01D1/10D01D10/06D01D5/12D01D10/02
CPCD01D1/02D01D1/10D01D5/06D01D5/12D01D10/02D01D10/06D01F1/10D01F6/54
Inventor 拜永孝胡新军沙嫣沙晓林
Owner NANTONG QIANGSHENG GRAPHENE TECH CO LTD
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