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Carbon fiber paper as well as preparation method and application thereof

A carbon fiber paper and chopped fiber technology, applied in the directions of fiber processing, fiber type, fiber chemical characteristics, etc., can solve the problems of uniformity, poor flatness, poor tensile strength of carbon paper, and difficulty in dispersion of the forming base paper, and achieves the realization of batch production. The effect of large-scale production, simple process flow and low energy consumption

Active Publication Date: 2022-08-05
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface of carbon fiber is chemically inert and has poor hydrophilicity, making it difficult to disperse in aqueous solution, resulting in poor uniformity and flatness of the forming base paper, and the carbon paper prepared by subsequent carbonization and graphitization has poor tensile strength and is not resistant to folding, making it difficult to apply In the gas diffusion layer of a fuel cell
In addition, since domestic carbon fiber can only produce low-end carbon fiber precursors, research on high-end polyacrylonitrile carbon fiber is not involved

Method used

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  • Carbon fiber paper as well as preparation method and application thereof
  • Carbon fiber paper as well as preparation method and application thereof
  • Carbon fiber paper as well as preparation method and application thereof

Examples

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preparation example Construction

[0028] The invention provides a preparation method of carbon fiber paper, comprising the following steps:

[0029] 1) preparing acrylonitrile-N-vinylformamide copolymer by a dry-spraying wet method to prepare polyacrylonitrile-based pre-filaments, and obtaining polyacrylonitrile-based chopped fiber pre-filaments through chopped treatment;

[0030] 2) The polyacrylonitrile-based chopped fiber precursors are sequentially subjected to forward and reverse spunlace, drying and winding to obtain a polyacrylonitrile-based non-woven felt;

[0031] 3) pre-oxidizing the polyacrylonitrile-based non-woven felt to obtain a polyacrylonitrile-based pre-oxidizing felt;

[0032] 4) After dipping the polyacrylonitrile-based pre-oxidized felt in the resin solution, drying, hot pressing and curing, carbonization and graphitization are performed in sequence to obtain carbon fiber paper.

[0033] In the invention, acrylonitrile-N-vinylformamide copolymer is used as raw material to prepare a spinni...

Embodiment 1

[0056] Using acrylonitrile-N-vinylformamide copolymer as a raw material and dissolving it in dimethyl sulfoxide, a spinning precursor solution with an acrylonitrile-N-vinylformamide copolymer content of 23 wt% was prepared. The spinning precursor solution is finely denier (diameter 5-10um) and highly oriented (orientation degree 93) through dry spray wet spinning, multi-stage water washing and drawing, oil drying, two-stage steam drawing, and heat setting. %) of polyacrylonitrile-based carbon fiber precursors, which were chopped to obtain polyacrylonitrile-based chopped fiber precursors (10 mm in length).

[0057] The polyacrylonitrile-based chopped fiber strands were placed on the carding machine, spunlace in the forward and reverse directions, dried and wound at 70 ° C for 3 hours, and the gram weight was 160 g / m. 2 of polyacrylonitrile-based non-woven felt.

[0058] The polyacrylonitrile-based non-woven felt was put into a multi-stage step-by-step programmed temperature-co...

Embodiment 2

[0063] In Example 1, the mass fraction of cardanol-boron phenolic resin in the solution was changed from 15% to 10%, and other conditions were the same as those in Example 1.

[0064] The scanning electron microscope image of the polyacrylonitrile-based pre-oxidized felt after hot-press curing of the present embodiment is as follows figure 2 shown, by figure 2 It can be seen that the polyacrylonitrile-based pre-oxidized felt after hot pressing and curing is composed of staggered fiber webs, and the fibers are connected by cured resin.

[0065] The scanning electron microscope image of the carbon fiber paper of the present embodiment is as follows image 3 shown, by image 3 It can be seen that the carbon fiber paper is composed of staggered fiber webs, and the fibers are connected by a small amount of resin carbon.

[0066] The grammage of the carbon fiber paper of this embodiment is 80 g / m 2 , the resistivity is 7.8mΩ·cm, and the air permeability is 1900ml·mm / (cm 2 ·hr...

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Abstract

The invention belongs to the technical field of carbon fiber paper, and provides carbon fiber paper and a preparation method thereof.The preparation method comprises the following steps that polyacrylonitrile-based precursors are prepared from acrylonitrile-N-vinylformamide copolymer through a dry spraying wet method, and polyacrylonitrile-based chopped fiber precursors are obtained through chopping treatment; sequentially carrying out positive and negative spunlace, drying and winding on the polyacrylonitrile-based chopped fiber precursor to obtain a polyacrylonitrile-based non-woven felt; carrying out pre-oxidation treatment on the polyacrylonitrile-based non-woven felt to obtain a polyacrylonitrile-based pre-oxidized felt; the polyacrylonitrile-based pre-oxidized felt is soaked in a resin solution and then sequentially subjected to drying, hot-pressing curing, carbonization and graphitization, and the carbon fiber paper is obtained. The invention also provides application of the carbon fiber paper. According to the preparation method, the conductivity and air permeability of the carbon fiber paper can be remarkably improved, the preparation process of the carbon paper for the gas diffusion layer of the proton exchange membrane fuel cell is expanded, and a new design idea is provided for actual industrial production of the carbon paper.

Description

technical field [0001] The invention relates to the technical field of carbon fiber paper, in particular to a carbon fiber paper and a preparation method and application thereof. Background technique [0002] Proton exchange membrane hydrogen fuel cell (PEMFC) has the advantages of high power density, high energy conversion rate, low temperature start-up, and no pollution, and is considered to be the ultimate solution for new energy. As a key component in PEMFC, gas diffusion layer requires good electrical conductivity, uniform porosity, thermal stability and corrosion resistance, and carbon fiber paper is currently the only material that can meet the requirements of PEMFC gas diffusion layer. [0003] At present, the preparation technology and products of carbon fiber paper used in commercial hydrogen fuel cell vehicles are imported from abroad, and the price is expensive, and the import quantity is limited. Carbon fiber paper is mainly prepared by traditional wet molding,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22D06M10/00D06M13/152D06M15/41D04H1/492D04H1/485D04H1/43D06B3/10H01M4/88D06M101/28
CPCD01F9/22D06M10/00D06M13/152D06M15/41D04H1/492D04H1/485D04H1/43D06B3/10H01M4/8807D06M2101/28Y02E60/50
Inventor 巨安奇倪学鹏
Owner DONGHUA UNIV
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