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Carbon fiber paper and preparation method thereof

A technology of carbon fiber paper and graphite fiber, which is applied in fiber raw material processing, synthetic cellulose/non-cellulose material pulp/paper, paper, etc., can solve the problems of unsatisfactory bonding effect of phenolic resin, unstable structure of carbon fiber paper, High cost and other issues, to achieve the effect of shortening the activation time, improving the conductivity, and good conductivity

Active Publication Date: 2010-08-11
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems of time-consuming and energy-consuming activation of carbon fiber paper, high cost of carbon fiber paper, unsatisfactory bonding effect of traditional phenolic resin, and insufficient stability of carbon fiber paper structure after high-temperature heat treatment, the present invention provides a carbon fiber paper, especially a A kind of carbon fiber paper with low cost, high structural stability, which can be used for gas diffusion layer of proton exchange membrane fuel cell and preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] For PAN-based graphite fibers, the degree of graphitization is 60%, and the diameter is 6 μm. After microwave activation treatment, it is chopped, and the fiber is soaked in a solution of KOH with a concentration of 5wt%. The time of microwave activation treatment is 5 minutes, and the microwave power is 500W. The length of the chopped PAN-based graphite fiber after the activation treatment is 5 mm. The PAN-based graphite short fibers after microwave activation treatment are formed by wet papermaking to obtain base paper; the phenol triazine resin is dissolved in anhydrous ethanol solvent with a concentration of 1 wt%; the resin solution is sprayed on the upper and lower surfaces of the base paper, The thickness is 0.5μm, and after drying, it is hot-pressed into a semi-finished product; the drying temperature is 40°C, and the weight is constant after drying, and then it is hot-pressed with a flat vulcanizing machine at a pressure of 2MPa for 5 minutes; the semi-finished ...

Embodiment 2

[0041] For PAN-based graphite fibers, the degree of graphitization is 70%, and the diameter is 7 μm. After microwave activation treatment, it is chopped, and the fiber is soaked in a solution of NaOH with a concentration of 5wt%. The time of microwave activation treatment is 10 minutes, and the microwave power is 800W. The length of the chopped PAN-based graphite fiber after the activation treatment is 10mm. The PAN-based graphite short fibers after microwave activation treatment are formed by wet papermaking to obtain base paper; the phosphorus molybdenum phenolic resin is dissolved in absolute ethanol solvent with a concentration of 4wt%; the resin solution is sprayed on the upper and lower surfaces of the base paper, The thickness is 1μm, and after drying, it is hot-pressed into a semi-finished product; the drying temperature is 50°C, and the weight is constant after drying, and then hot-pressed with a flat vulcanizing machine, the pressure is 2MPa, and the time is 5 minutes...

example 3

[0043] For PAN-based graphite fibers, the degree of graphitization is 80%, and the diameter is g μm. After microwave activation treatment, it is chopped, and the fiber is soaked in a solution of NaOH with a concentration of 10wt%. The time of microwave activation treatment is 9 minutes, and the microwave power is 900W. The length of the chopped PAN-based graphite fiber after the activation treatment is 10mm. The PAN-based graphite short fibers after microwave activation treatment are formed by wet papermaking to obtain base paper; the boron phenolic resin is dissolved in anhydrous ethanol solvent with a concentration of 4wt%; the resin solution is sprayed on the upper and lower surfaces of the base paper, with a thickness of It is 2.5μm, and after drying, it is hot-pressed into a semi-finished product; the drying temperature is 70°C, and the weight is constant after drying, and then hot-pressed with a flat vulcanizing machine, the pressure is 5MPa, and the time is 5 minutes; th...

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Abstract

The invention relates to carbon fiber paper and a preparation method thereof, in particular to carbon fiber paper which has low cost and high structural stability and can be used for gas diffusion layers of proton exchange membrane fuel cells (PEMFC) and a preparation method thereof. The carbon fiber paper of the invention comprises PAN-based graphite fibers and resin carbon and is in a three-dimensional reticular structure formed by the PAN-based graphite fibers bonded by the resin carbon, the resin carbon is tightly lapped on the junction of every two PAN-based graphite fibers, and the mass percent of the resin carbon of the carbon fiber paper is 10-20%. The preparation method of the carbon fiber paper of the invention comprises the steps of activating, short cutting, paper making and molding by a wet process, resin spraying, drying, hot pressing, heat treating and the like. The invention solves the problems of time consumption and energy consumption of activating treatment of the carbon fiber paper in the prior art, overhigh cost of the carbon fiber paper, unsatisfactory bonding effect of the traditional phenolic resin and unstable structure of the carbon fiber paper after high-temperature heat treatment, and overcomes the defects of the prior art.

Description

technical field [0001] The invention relates to a carbon fiber paper and a preparation method thereof, in particular to a low-cost, high structural stability carbon fiber paper which can be used for the gas diffusion layer of a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell is a power generation device that directly converts chemical energy into electrical energy. It has the advantages of low operating temperature, fast start-up, high specific power, simple structure, and convenient operation. It is recognized as the first choice for electric vehicles, fixed power stations, etc. Preferred energy source. The key components of a proton exchange membrane fuel cell are a proton exchange membrane, a porous gas diffusion electrode and a bipolar plate. Among them, the porous gas diffusion electrode is usually divided into two layers: one layer is a gas diffusion layer, and the other layer is a c...

Claims

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Application Information

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IPC IPC(8): D21H13/50D21H23/50H01M8/02H01M4/86H01M8/0234
CPCY02E60/50Y02P70/50
Inventor 段琼娟王彪李江尹璐王华平
Owner DONGHUA UNIV
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