CN109423918A - The preparation process of fuel cell electrode porous diffusion layer material carbon fiber paper - Google Patents

The preparation process of fuel cell electrode porous diffusion layer material carbon fiber paper Download PDF

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Publication number
CN109423918A
CN109423918A CN201710759097.8A CN201710759097A CN109423918A CN 109423918 A CN109423918 A CN 109423918A CN 201710759097 A CN201710759097 A CN 201710759097A CN 109423918 A CN109423918 A CN 109423918A
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carbon fiber
paper
water
chopped carbon
added
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不公告发明人
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Changxin Two-Dimension Carbon Material Co Ltd
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Changxin Two-Dimension Carbon Material Co Ltd
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Priority to CN201710759097.8A priority Critical patent/CN109423918A/en
Publication of CN109423918A publication Critical patent/CN109423918A/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/06—Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • D21H17/29—Starch cationic
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06—Paper forming aids
    • D21H21/08—Dispersing agents for fibres
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06—Paper forming aids
    • D21H21/10—Retention agents or drainage improvers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

The present invention relates to fuel cell electrode porous diffusion layer Material Fields, specially a kind of fuel cell electrode porous diffusion layer manufacture preparation process of basic material carbon fiber paper, carbon fiber paper can realize batch production on common copy paper machine production line, and meet the needs of manufacture fuel cell porous diffusion layer electrode.The technique includes: the surface treatment of (1) chopped carbon fiber；(2) surface treatment of conductive carbon black；(3) log slurry and water ratio are 5-15%, and log slurry is smashed and is put into defibrination pond.Carbon fiber paper produced by the invention can achieve porous expanding layer material manufacture and require, support catalyst layer can be played in the electrodes and stablizes the even action of electrode structure, it is also equipped with and provides the functions such as gas passage, electron channel and drainage channel for electrode reaction, with porous structure, excellent gas making, low-resistivity, high conductivity have certain mechanical strength, chemical stability and thermal stability.

Description

The preparation process of fuel cell electrode porous diffusion layer material carbon fiber paper
The present invention relates to fuel cell electrode porous diffusion layer Material Field, specially a kind of porous expansion of fuel cell electrode Dissipate the preparation process that basic material carbon fiber paper is used in layer manufacture.
Gas diffusion layer material plays a part of supporting catalyst layer in the electrodes, stablizes electrode structure, also anti-for electrode Fuel gas channel, electron channel and drainage channel, structure, manufacturing process of the different diffusion layer materials for electrode should be provided Also different with the influence of performance, carbon fiber paper (carbon paper), carbon cloth, non-woven cloth and carbon black paper etc. are common several electrodes Material.
Currently, gas diffusion layers have using carbon fiber paper (carbon paper), also have using carbon cloth material.They not only have uniformly Porous laminate structure, good conductivity, chemical stability and heat-resist and surfacing can reduce inside battery contact electricity Resistance.Existing is mainly both at home and abroad composite carbon paper material for the carbon paper of electrode diffusion layer, it is by carbon fiber, wood pulp, cellulose fiber Dimension or acid polyethylene staple fiber etc. can carbon fibre mix, paper pulp is made, carbon paper is then made.Carbon paper is made in this technique, The intensity for guaranteeing carbon paper due to it wherein joined more non-conductive material, and carbon fiber content is below 90%.Therefore, cause resistivity larger, porosity and its structure are not reasonable.
The carbon fiber paper needs that fuel cell uses have the following performance:
(1) uniform porous structure, excellent gas permeability；
(2) low resistivity assigns its high electronic conduction ability；
(3) close structure and surfacing improve layer performance to reduce contact resistance；
(4) there is certain mechanical strength, be conducive to electrode fabrication；
(5) there is chemical stability and thermal stability.
Currently, the manufacturing technology of domestic outer fuel cell is more.But it is possible to which the country for producing carbon fiber paper only has Individual advanced countries, and can be realized small lot production without one in China, some is also only at the test production phase. The production domesticization of fuel cell electrode porous diffusion layer material will break developed country to the envelope of China's fuel cell critical material Lock plays important facilitation for the development of China's fuel cell.
The purpose of the present invention is to provide a kind of preparation process of fuel cell electrode porous diffusion layer material carbon fiber paper, Carbon fiber paper can realize batch production on common copy paper machine production line, and meet manufacture fuel cell porous diffusion layer electrode Needs.
The technical scheme is that
A kind of preparation process of fuel cell electrode porous diffusion layer material carbon fiber paper, includes the following steps:
(1) surface treatment of chopped carbon fiber
By chopped carbon fiber in acetone, mixed liquid dipping 2-3 hours of second alcohol and water, by weight, acetone: ethyl alcohol: Then water=1:1:20 pulls leaching dry liquids out；
Chopped carbon fiber is poured into container, and the dispersing agent for accounting for chopped carbon fiber total weight 0.1-0.3% is added, is carried out 1000-3000 revs/min of high-speed separation stirring, time 0.5-2 hour；
(2) surface treatment of conductive carbon black
After conductive carbon black is impregnated 3-4 hours in the ethanol water that concentration is 5wt%, led together with ethanol water Enter defibrination pond；
(3) log slurry is put into pulper, log slurry is 5-15% with water ratio, and log slurry is smashed and is put into defibrination Pond；
(4) processed conductive carbon black and log slurry are added obtained by step (2) and step (3) by weight 1:(1-2) The chopped carbon fiber of total weight 1/3 is added into defibrination pond in raw material；Then, first time plasm-glue-blending is carried out, addition accounts for chopped The cationic starch of carbon fiber total weight 0.2-0.4% starts refining equipment electric current defibrination 1-2 hours at full capacity, works as beating degree When up to 30-40 ° of SR, and after observing and can't see chopped carbon fiber, fiberizer is decontroled, electric current reduces half, pours into remaining short The half of carbon fiber total weight is cut, and the water of added 1 times of weight of chopped carbon fiber is added, after continuing defibrination 1-2 hours, by defibrination Machine is decontroled completely, and electric current is put to minimum, remaining chopped carbon fiber is all poured into fiberizer, and fallen chopped carbon fiber is added 1 times of water carries out second and is glued, the cationic starch for accounting for chopped carbon fiber total weight 0.1-0.3% is added；
(5) after continuing defibrination 20-40 minutes, it is all put into machine chest, and add and be put into substance total weight 4-6 in machine chest Times water, start blender, be added retention agent, retention agent account for plus water after total weight 1-3%, must be slurried after mixing evenly, with Standby paper machine copy paper；
(6) papermaking machine belt water running soaks the felt in paper machine, will when the drying cylinder of paper machine reaches 80-90 DEG C Paper machine is transferred to 1000-3000 revs/min of required revolving speed；
At this moment, it will be slurried and get to a header box, and water is got into another header box, open two header box valves, together When in slurry case by weight 1:1.5-2 slurry mixed with water after, be put into the net cage of paper machine, and start copy paper dry, at Volume, obtains carbon fiber paper.
The preparation process of the fuel cell electrode porous diffusion layer material carbon fiber paper, by weight, conductive carbon It is black: chopped carbon fiber: log slurry=1:(7-8): (1-2).
The preparation process of the fuel cell electrode porous diffusion layer material carbon fiber paper, by the conductive carbon black, short The weight ratio of carbon fiber, log slurry is cut, the chopped carbon fiber that step (1) has dispersing agent is added in step (4).
The preparation process of the fuel cell electrode porous diffusion layer material carbon fiber paper, carbon fiber paper 80-100 Gram/carbon fiber paper of m2, porosity 20-30%, conductive sheet resistance is 3-10 Ω/c ㎡.
The preparation process of the fuel cell electrode porous diffusion layer material carbon fiber paper, in step (4), minimum current For 8-10A.
The beneficial effects of the present invention are:
1, carbon fiber paper produced by the invention can achieve porous expanding layer material manufacture and require, and can play in the electrodes Support catalyst layer and stablize the even action of electrode structure, be also equipped with for electrode reaction provide gas passage, electron channel and The functions such as drainage channel, have a porous structure, excellent gas making, low-resistivity, and high conductivity has certain machinery strong Degree, chemical stability and thermal stability.
2, the present invention carries out chopped carbon fiber and conductive carbon black at surface before producing carbon fiber paper with treatment fluid respectively Reason, the effect of surface treatment are to soften chopped carbon fiber and conductive carbon black, and remove the impurity that surface is stayed in carbonization, are had It is more uniform conducive to the paper for preferably dispersing to be ferreted out in the case where dispersing agent acts on.
In the present invention, the preparation process of fuel cell electrode porous diffusion layer material carbon fiber paper is as follows:
(1) surface treatment of chopped carbon fiber
By chopped carbon fiber in acetone, mixed liquid dipping 2-3 hours of second alcohol and water, by weight, acetone: ethyl alcohol: Then water=1:1:20 pulls leaching dry liquids out；
Chopped carbon fiber is poured into container, and the dispersing agent for accounting for chopped carbon fiber total weight 0.1-0.3% is added, is carried out 1000-3000 revs/min of high-speed separation stirring, time 0.5-2 hour；
(2) surface treatment of conductive carbon black
After conductive carbon black is impregnated 3-4 hours in the ethanol water that concentration is 5wt%, led together with ethanol water Enter defibrination pond；
(3) log slurry is put into pulper, log slurry is 5-15% with water ratio, and log slurry is smashed and is put into defibrination Pond；
(4) processed conductive carbon black and log slurry are added obtained by step (2) and step (3) by weight 1:(1-2) Chopped carbon fiber (ratio by weight, the conductive carbon black: chopped carbon fiber: former of total weight 1/3 is added into defibrination pond in raw material Wood pulp=1:(7-8): the chopped carbon fiber that step (1) has dispersing agent is added in (1-2))；Then, it carries out applying in first time slurry Glue is added and accounts for the cationic starch of chopped carbon fiber total weight 0.2-0.4%, start refining equipment at full capacity electric current (motor Rated current 50-300A) defibrination 1-2 hours, when beating degree (beating degree) reach 30-40 (° SR) when, and observe can't see it is chopped After carbon fiber, fiberizer is decontroled, electric current reduces half, pours into the half of remaining chopped carbon fiber total weight, and added by addition Fiberizer is decontroled completely after continuing defibrination 1-2 hours, electric current is put to minimum (8- by the water that 1 times of chopped carbon fiber weight 10A), remaining chopped carbon fiber is all poured into fiberizer, and the water of 1 times of fallen chopped carbon fiber is added, applied for the second time The cationic starch for accounting for chopped carbon fiber total weight 0.1-0.3% is added in glue；
In the present invention, refining equipment is infused from electric current at full capacity to electricity reduces half, then arrives minimum value 8-10A, does so Benefit is: under different electric currents, chopped carbon fiber can be cut into different length by defibrination pond, have one in chopped carbon fiber Measured length and chopped carbon fiber it is different in size in the case where, it can be ensured that its porosity reach and air penetrability reaches requirement.
(5) after continuing defibrination 20-40 minutes, it is all put into machine chest, and add and be put into substance total weight 4-6 in machine chest Times water, start blender, be added retention agent, retention agent account for plus water after total weight 1-3%, must be slurried after mixing evenly, with Standby paper machine copy paper；
(6) papermaking machine belt water running soaks the felt in paper machine, will when the drying cylinder of paper machine reaches 80-90 DEG C Paper machine is transferred to 1000-3000 revs/min of required revolving speed；
At this moment, it will be slurried and get to a header box, and water is got into another header box, open two header box valves, together When in slurry case by weight 1:1.5-2 slurry mixed with water after, be put into the net cage of paper machine, and start copy paper dry, at Volume, can be obtained the carbon fiber paper of 80-100 grams/m2, porosity 20-30%, and conductive sheet resistance is 3-10 Ω/c ㎡.
The present invention select high conductivity, high-modulus, high intensity chopped carbon fiber (such as: Japan east nation, the beautiful, Tai Wandong in east It is beautiful etc., the production of the producers such as domestic orchidization, Jilin Chemical), the key technical indexes: length 4-6mm, fibre diameter: 5-10 μm, resistance Rate: 1.0-1.6 Ω cm, stretch modulus: 200-300GPa, tensile strength: 2000-4000MPa.
Conductive carbon black is mainly used in conductive and anti-static coatings, plastics, rubber as a kind of highly conductive filler of functionality Glue, adhesive, ink, battery material, cable shield material etc. are widely used in electronics, electromechanics, communication, printing, aviation boat It, the conduction of each industrial department such as weapons, electromagnetic shielding, antistatic field.The present invention is using conventional conductive carbon black, such as: day The production of gold the earth carbon black plant, Jinshi City, conductive black series mainly have: CD1, CD2, CD3, CD4, CD5 or CD6 etc..
Inventive dispersant selects conventional polyvinyl alcohol, poly- propionic acid amine, methylcellulose, sodium carboxymethylcellulose or hydroxyl Ethyl cellulose etc..Such as: select the WSP-5 dispersing agent of the auspicious photoinitiator chemical Co., Ltd in Shandong Weifang production, dispersing agent be it is colourless extremely Yellowish transparency liquid has certain sequestering power, is widely used in printing and dyeing, papermaking and detergent and cleaning agent.
The present invention using conventional paper forming equipment produce, if the equipment be mainly pulper, fiberizer, pulp storage tank, machine chest, Solid carbon dioxide pond (water is to be recycled not only to have saved but also environmentally friendly) and common cylinder paper machine.
The present invention is glued the cationic starch using routine, as: Yanzhou Tiancheng Chemical Co., Ltd., Shandong Province produces AKD type cationic starch.
Retention agent of the present invention is using conventional Retention Aid in Papermaking, such as: the JNC type of Foshan South Sea Jun Neng papermaking material factory production Gloomy Retention Aid in Papermaking, Degussa Retention Aid in Papermaking or U.S.'s Ya Shilan Retention Aid in Papermaking etc. are liked by retention agent, France.
Embodiment 1
According to parts by weight, log starches 10 parts, 80 parts of chopped carbon fiber, 10 parts of conductive carbon black.In the present embodiment, fuel electricity The preparation process of pond electrode porous diffusion layer material carbon fiber paper is as follows:
(1) surface treatment of chopped carbon fiber
By chopped carbon fiber in acetone, mixed liquid dipping 2.5 hours of second alcohol and water, by weight, acetone: ethyl alcohol: Then water=1:1:20 pulls leaching dry liquids out；
Chopped carbon fiber is poured into container, and the dispersing agent (Methyl cellulose for accounting for chopped carbon fiber total weight 0.2% is added Element), it carries out 2000 revs/min of high-speed separation and stirs, the time 1 hour；
(2) surface treatment of conductive carbon black
After conductive carbon black is impregnated 3.5 hours in the ethanol water that concentration is 5wt%, led together with ethanol water Enter defibrination pond；
(3) log slurry is put into pulper, log slurry is 10% with water ratio, and log slurry is smashed and is put into defibrination pond；
(4) raw material obtained by step (2) and step (3) is added by weight 1:1 in processed conductive carbon black and log slurry Into defibrination pond, and chopped carbon fiber (ratio by weight, the conductive carbon black: chopped carbon fiber: log slurry of total weight 1/3 is added The chopped carbon fiber that step (1) has dispersing agent is added in=1:8:1)；Then, first time plasm-glue-blending is carried out, addition accounts for chopped The cationic starch of carbon fiber total weight 0.3% starts refining equipment electric current (the rated current 100A of motor) defibrination at full capacity 1.5 hours, when beating degree (beating degree) is up to 35 (° SR), and after observing and can't see chopped carbon fiber, fiberizer is decontroled, Electric current reduces half, pours into the half of remaining chopped carbon fiber total weight, and the water of added 1 times of weight of chopped carbon fiber is added, After continuing defibrination 1.5 hours, fiberizer is decontroled completely, electric current is put to minimum (8-10A), remaining chopped carbon fiber is whole Fiberizer is poured into, and the water of 1 times of fallen chopped carbon fiber is added, second is carried out and is glued, addition accounts for chopped carbon fiber total weight 0.2% cationic starch；
(5) after continuing defibrination 30 minutes, it is all put into machine chest, and add and 5 times of substance total weight are put into machine chest Water, starts blender, be added Retention Aid in Papermaking (such as: gloomy Retention Aid in Papermaking is liked by France), retention agent account for plus water after total weight 2%, it must be slurried after mixing evenly, in case paper machine copy paper；
(6) felt in paper machine is soaked, when the drying cylinder of paper machine reaches 85 DEG C, will be made by papermaking machine belt water running Paper machine is transferred to 2000 revs/min of required revolving speed；
At this moment, it will be slurried and get to a header box, and water is got into another header box, open two header box valves, together When in slurry case by weight 1:1.8 slurry mix with water after, be put into the net cage of paper machine, and start copy paper dry, in rolls, The carbon fiber paper of 80-100 grams/m2, porosity 20-30% can be obtained.
The carbon fiber paper of 80g/m2 processed is copied, the conductive sheet resistance of carbon fiber paper is 5 Ω/c ㎡；Copy the carbon fiber of 100g/m2 processed Paper, the conductive sheet resistance of carbon fiber paper are 3 Ω/c ㎡.
Embodiment 2
According to parts by weight, log starches 15 parts, 75 parts of chopped carbon fiber, 10 parts of conductive carbon black.In the present embodiment, fuel electricity The preparation process of pond electrode porous diffusion layer material carbon fiber paper is as follows:
(1) surface treatment of chopped carbon fiber
By chopped carbon fiber in acetone, mixed liquid dipping 2 hours of second alcohol and water, by weight, acetone: ethyl alcohol: water Then=1:1:20 pulls leaching dry liquids out；
Chopped carbon fiber is poured into container, and the dispersing agent (carboxymethyl cellulose for accounting for chopped carbon fiber total weight 0.1% is added Plain sodium), it carries out 1000 revs/min of high-speed separation and stirs, the time 0.5 hour；
(2) surface treatment of conductive carbon black
After conductive carbon black is impregnated 3 hours in the ethanol water that concentration is 5wt%, imported together with ethanol water Defibrination pond；
(3) log slurry is put into pulper, log slurry is 5% with water ratio, and log slurry is smashed and is put into defibrination pond；
(4) it by processed conductive carbon black and log slurry by weight 1:1.5, is added former obtained by step (2) and step (3) Expect in defibrination pond, and chopped carbon fiber (ratio by weight, the conductive carbon black: chopped carbon fiber: log of total weight 1/3 is added The chopped carbon fiber that step (1) has dispersing agent is added in slurry=1:7.5:1.5)；Then, first time plasm-glue-blending is carried out, is added The cationic starch for accounting for chopped carbon fiber total weight 0.2% starts refining equipment electric current (the rated current 80A of motor) at full capacity Defibrination 1 hour, when beating degree (beating degree) is up to 30 (° SR), and after observing and can't see chopped carbon fiber, fiberizer is put It opens, electric current reduces half, pours into the half of remaining chopped carbon fiber total weight, and added 1 times of weight of chopped carbon fiber is added Water decontrols fiberizer after continuing defibrination 1 hour completely, and electric current is put to minimum (8-10A), and remaining chopped carbon fiber is complete Fiberizer is poured into portion, and the water of 1 times of fallen chopped carbon fiber is added, and carries out second and is glued, addition accounts for chopped carbon fiber gross weight The cationic starch of amount 0.1%；
(5) continue defibrination after twenty minutes, be all put into machine chest, and add and be put into machine chest 4 times of substance total weight Water, starts blender, is added Retention Aid in Papermaking (Degussa Retention Aid in Papermaking), retention agent account for plus water after total weight 1%, stirring It must be slurried after uniformly, in case paper machine copy paper；
(6) felt in paper machine is soaked, when the drying cylinder of paper machine reaches 80 DEG C, will be made by papermaking machine belt water running Paper machine is transferred to 1000 revs/min of required revolving speed；
At this moment, it will be slurried and get to a header box, and water is got into another header box, open two header box valves, together When in slurry case by weight 1:1.5 slurry mix with water after, be put into the net cage of paper machine, and start copy paper dry, in rolls, The carbon fiber paper of 80-100 grams/m2, porosity 20-30% can be obtained.
The carbon fiber paper of 80g/m2 processed is copied, the conductive sheet resistance of carbon fiber paper is 8 Ω/c ㎡；Copy the carbon fiber of 100g/m2 processed Paper, the conductive sheet resistance of carbon fiber paper are 3 Ω/c ㎡.
Embodiment 3
According to parts by weight, log starches 20 parts, 70 parts of chopped carbon fiber, 10 parts of conductive carbon black.In the present embodiment, fuel electricity The preparation process of pond electrode porous diffusion layer material carbon fiber paper is as follows:
(1) surface treatment of chopped carbon fiber
By chopped carbon fiber in acetone, mixed liquid dipping 3 hours of second alcohol and water, by weight, acetone: ethyl alcohol: water Then=1:1:20 pulls leaching dry liquids out；
Chopped carbon fiber is poured into container, and the dispersing agent (hydroxy ethyl fiber for accounting for chopped carbon fiber total weight 0.3% is added Element), carry out 3000 revs/min of high-speed separation stirring, time 2 h；
(2) surface treatment of conductive carbon black
After conductive carbon black is impregnated 4 hours in the ethanol water that concentration is 5wt%, imported together with ethanol water Defibrination pond；
(3) log slurry is put into pulper, log slurry is 15% with water ratio, and log slurry is smashed and is put into defibrination pond；
(4) raw material obtained by step (2) and step (3) is added by weight 1:2 in processed conductive carbon black and log slurry Into defibrination pond, and chopped carbon fiber (ratio by weight, the conductive carbon black: chopped carbon fiber: log slurry of total weight 1/3 is added The chopped carbon fiber that step (1) has dispersing agent is added in=1:7:2)；Then, first time plasm-glue-blending is carried out, addition accounts for chopped The cationic starch of carbon fiber total weight 0.4% starts refining equipment electric current (the rated current 120A of motor) defibrination 2 at full capacity Hour, when beating degree (beating degree) is up to 40 (° SR), and after observing and can't see chopped carbon fiber, fiberizer is decontroled, electric current Half is reduced, the half of remaining chopped carbon fiber total weight is poured into, and the water of added 1 times of weight of chopped carbon fiber is added, is continued After defibrination 2 hours, fiberizer is decontroled completely, electric current is put to minimum (8-10A), remaining chopped carbon fiber is all poured into mill Pulp grinder, and the water of 1 times of fallen chopped carbon fiber is added, it carries out second and is glued, addition accounts for chopped carbon fiber total weight 0.3% Cationic starch；
(5) continue defibrination after forty minutes, be all put into machine chest, and add and be put into machine chest 6 times of substance total weight Water, starts blender, is added Retention Aid in Papermaking (U.S.'s Ya Shilan Retention Aid in Papermaking), retention agent account for plus water after total weight 3%, It must be slurried after mixing evenly, in case paper machine copy paper；
(6) felt in paper machine is soaked, when the drying cylinder of paper machine reaches 90 DEG C, will be made by papermaking machine belt water running Paper machine is transferred to 3000 revs/min of required revolving speed；
At this moment, it will be slurried and get to a header box, and water is got into another header box, open two header box valves, together When in slurry case by weight 1:2 slurry mix with water after, be put into the net cage of paper machine, and start copy paper dry, in rolls, i.e., The carbon fiber paper of 80-100 grams/m2, porosity 20-30% can be obtained.
The carbon fiber paper of 80g/m2 processed is copied, the conductive sheet resistance of carbon fiber paper is 10 Ω/c ㎡；Copy the carbon fiber of 100g/m2 processed Paper, the conductive sheet resistance of carbon fiber paper are 3 Ω/c ㎡.

Claims (5)

1. a kind of preparation process of fuel cell electrode porous diffusion layer material carbon fiber paper, which is characterized in that including walking as follows It is rapid:
(1) surface treatment of chopped carbon fiber
By chopped carbon fiber in acetone, mixed liquid dipping 2-3 hours of second alcohol and water, by weight, acetone: ethyl alcohol: water= Then 1:1:20 pulls leaching dry liquids out；
Chopped carbon fiber is poured into container, and the dispersing agent for accounting for chopped carbon fiber total weight 0.1-0.3% is added, carries out 1000- 3000 revs/min of high-speed separation stirring, time 0.5-2 hour；
(2) surface treatment of conductive carbon black
After conductive carbon black is impregnated 3-4 hours in the ethanol water that concentration is 5wt%, mill is imported together with ethanol water Stock tank；
(3) log slurry is put into pulper, log slurry is 5-15% with water ratio, and log slurry is smashed and is put into defibrination pond；
(4) raw material obtained by step (2) and step (3) is added by weight 1:(1-2) in processed conductive carbon black and log slurry Into defibrination pond, and the chopped carbon fiber of total weight 1/3 is added；Then, first time plasm-glue-blending is carried out, addition accounts for chopped carbon fiber The cationic starch for tieing up total weight 0.2-0.4%, starts refining equipment electric current defibrination 1-2 hours at full capacity, when beating degree reaches 30- When 40 ° of SR, and observe can't see chopped carbon fiber after, fiberizer is decontroled, electric current reduce half, pour into remaining chopped carbon fiber The half of total weight is tieed up, and the water of added 1 times of weight of chopped carbon fiber is added, it is after continuing defibrination 1-2 hours, fiberizer is complete It decontrols, electric current is put to minimum, remaining chopped carbon fiber is all poured into fiberizer, and 1 times of fallen chopped carbon fiber is added Water carries out second and is glued, the cationic starch for accounting for chopped carbon fiber total weight 0.1-0.3% is added；
(5) after continuing defibrination 20-40 minutes, it is all put into machine chest, and add and be put into 4-6 times of substance total weight in machine chest Water, starts blender, is added retention agent, retention agent account for plus water after total weight 1-3%, must be slurried after mixing evenly, in case of making Paper machine copy paper；
(6) papermaking machine belt water running soaks the felt in paper machine, when the drying cylinder of paper machine reaches 80-90 DEG C, by papermaking Machine is transferred to 1000-3000 revs/min of required revolving speed；
At this moment, it will be slurried and get to a header box, and water is got into another header box, open two header box valves, while After slurry in slurry case by weight 1:1.5-2 is mixed with water, it is put into the net cage of paper machine, and starts copy paper and dries, is coiled, is obtained To carbon fiber paper.
2. the preparation process of fuel cell electrode porous diffusion layer material carbon fiber paper described in accordance with the claim 1, feature It is, by weight, conductive carbon black: chopped carbon fiber: log slurry=1:(7-8): (1-2).
3. the preparation process of fuel cell electrode porous diffusion layer material carbon fiber paper according to claim 2, feature It is, by the weight ratio of the conductive carbon black, chopped carbon fiber, log slurry, step (1) is added in step (4) and has dispersing agent Chopped carbon fiber.
4. the preparation process of fuel cell electrode porous diffusion layer material carbon fiber paper described in accordance with the claim 1, feature It is, carbon fiber paper is the carbon fiber paper of 80-100 grams/m2, and porosity 20-30%, conductive sheet resistance is 3-00 Ω/c ㎡.
5. the preparation process of fuel cell electrode porous diffusion layer material carbon fiber paper described in accordance with the claim 1, feature It is, in step (4), minimum current 8-10A.
CN201710759097.8A 2017-08-30 2017-08-30 The preparation process of fuel cell electrode porous diffusion layer material carbon fiber paper Pending CN109423918A (en)

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