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Method for preparing carbon fiber paper for gas diffusion layer of fuel cell

A technology of gas diffusion layer and carbon fiber paper, which is applied to fuel cell parts, fuel cells, special paper, etc., can solve the problems of easy peeling production cost of chopped carbon fiber, low surface finish, and easy damage, so as to achieve difficult peeling , high mechanical strength, not easily damaged

Inactive Publication Date: 2009-12-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most widely used high-performance carbon fiber paper cannot balance the air permeability and mechanical strength of carbon fiber paper. Disadvantages such as stripping and high production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) Dilute 1g to 20g / cm 2 The carbon fiber felt sheet (chopped fiber content is 90%) is impregnated into 22g mass concentration and is the thermosetting amine catalyst phenolic resin ethanol solution of 5%, obtains the carbon fiber mat sheet phenolic resin prepreg;

[0016] 2) Take 5 layers of carbon fiber mat sheet phenolic resin prepreg and prepare the carbon fiber paper body by molding. The molding process conditions are: 10min at 170°C and 0.5MPa;

[0017] 3) Low-temperature carbonization of carbon fiber paper body under nitrogen protection to prepare low-temperature carbonization material, low-temperature carbonization process conditions: heating up to 650°C at a heating rate of 3°C / min, and carbonizing for 0.5h;

[0018] 4) Immerse the low-temperature carbonized material again in 15 g of thermosetting amine-catalyzed phenolic resin with a mass concentration of 5%, to prepare a secondary impregnating material;

[0019] 5) Dry the secondary impregnating material at ...

Embodiment 2

[0024] 1) Add 1.3g 30g / cm 2 The carbon fiber mat (chopped fiber content is 85%) is impregnated into 35g mass concentration and is in the ethanol solution of solid amine catalyst phenolic resin of 5%, obtains the carbon fiber mat phenolic resin prepreg;

[0025] 2) Take 3 layers of carbon fiber mat sheet phenolic resin prepreg and prepare carbon fiber paper body by molding. The molding process conditions are: 140°C, 5MPa, molding for 27min;

[0026] 3) Low-temperature carbonization of carbon fiber paper body under nitrogen protection to prepare low-temperature carbonization material, low-temperature carbonization process conditions: heating up to 500°C at a heating rate of 5°C / min, and carbonizing for 2 hours;

[0027] 4) The carbon fiber paper after low-temperature carbonization is immersed in 13 g of thermosetting amine-catalyzed phenolic resin ethanol solution with a mass concentration of 5% again to prepare a secondary impregnating material;

[0028] 5) Dry the secondary i...

Embodiment 3

[0033] 1) Add 2.1g 50g / cm 2 The carbon fiber felt sheet (chopped fiber content is 70%) is impregnated into 56g mass concentration and is in the thermosetting amine catalyzed phenolic resin ethanol solution of 5%, obtains the carbon fiber mat sheet phenolic resin prepreg;

[0034] 2) Take 2 layers of carbon fiber mat sheet phenolic resin prepreg and prepare carbon fiber paper body through molding process. The molding process conditions are: 120°C, 3Mpa, molding for 40min;

[0035] 3) Low-temperature carbonization of carbon fiber paper body under nitrogen protection to prepare low-temperature carbonization material, low-temperature carbonization process conditions: heating up to 900°C at a heating rate of 0.5°C / min, and carbonizing for 1 hour;

[0036] 4) Immerse the low-temperature carbonized material again in 10 g of thermosetting amine-catalyzed phenolic resin ethanol solution with a mass concentration of 5%, to prepare a secondary impregnating material;

[0037] 5) Dry the ...

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Abstract

The invention discloses a method for preparing carbon fiber paper for a gas diffusion layer of a fuel cell, and belongs to the field of fuel cells. The prior carbon fiber paper cannot give consideration to air permeability and mechanical strength, and has the problems of crisp texture, low surface glossiness, easy peeling of chopped carbon fiber, high production cost, and the like. The method comprises the following steps: soaking a carbon fiber mat in an ethanol solution of phenolic resin to obtain a carbon fiber mat and phenolic resin prepreg; die-pressing the prepreg to obtain a carbon fiber paper blank, and then carrying out low-temperature carbonization treatment; soaking the carbonized carbon fiber paper blank in the ethanol solution of phenolic resin again, and curing the soaked carbon fiber paper blank; and finally carrying out high-temperature carbonization treatment to obtain the carbon fiber paper for the gas diffusion layer of the fuel cell. The carbon fiber paper prepared by the method has high porosity, air permeability, electric conductivity and tensile strength, and can be used as a substrate material for the gas diffusion layer of the proton exchange membrane fuel cell.

Description

technical field [0001] The invention belongs to the field of fuel cells, in particular to a method for preparing carbon fiber paper with high air permeability, tensile strength and conductivity, in particular to a carbon fiber for gas diffusion layer of a proton exchange membrane fuel cell prepared by a secondary impregnation process paper method. Background technique [0002] A fuel cell is an electrochemical power generation device, which is different from a battery in the conventional sense. A fuel cell directly converts chemical energy into electrical energy isothermally and electrochemically. It does not go through a heat engine process, so it is not limited by the Carnot cycle, has high energy conversion efficiency (40%-60%), is environmentally friendly, and hardly emits nitrogen oxides and sulfur oxides. Moreover, the emission of carbon dioxide is also reduced by more than 40% compared with conventional power plants. It is precisely because of these outstanding adv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/00D21H13/50H01M8/02H01M4/86H01M8/0234
CPCY02E60/50Y02P70/50
Inventor 张学军裴浩沈曾民
Owner BEIJING UNIV OF CHEM TECH
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