CN102936867B - Preparation process of fuel cell electrode porous diffusion layer material carbon fiber paper - Google Patents
Preparation process of fuel cell electrode porous diffusion layer material carbon fiber paper Download PDFInfo
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- CN102936867B CN102936867B CN201210457292.2A CN201210457292A CN102936867B CN 102936867 B CN102936867 B CN 102936867B CN 201210457292 A CN201210457292 A CN 201210457292A CN 102936867 B CN102936867 B CN 102936867B
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Abstract
The invention relates to the field of fuel cell electrode porous diffusion layer materials, in particular to a preparation process of basic material carbon fiber paper for manufacturing fuel cell electrode porous diffusion layers. The carbon fiber paper can be produced on common paper machine production lines in a batch mode and meets the requirement for manufacture of fuel cell electrode porous diffusion layer electrodes. The preparation process comprises the steps of (1) performing surface treatment to short carbon fiber; (2) performing surface treatment to conductive carbon black; (3) smashing raw wood pulp and placing the raw wood pulp into a pulping pond, wherein the ratio of the raw wood pulp to water is 5-15%; and the like. The carbon fiber paper produced by means of the preparation process can meet the requirement for manufacture of the fuel cell electrode porous diffusion materials, can evenly support catalyst layers in electrodes and stabilizing electrode structures, further has functions of providing gas channels, electronic channels and drainage channels for electrode reaction and the like, and has porous structures, excellent gas generating performance, high conductivity, certain mechanical strength, chemical stability and heat stability.
Description
Technical field
The present invention relates to fuel cell electrode porous diffusion layer Material Field, be specially the preparation technology of a kind of fuel cell electrode porous diffusion layer manufacture basic material carbon fiber paper.
Background technology
Gas diffusion layer material plays a part support catalyst layer, stabilized electrodes structure in electrode, also for electrode reaction provides fuel gas channel, electron channel and drainage channel, different diffusion layer materials is also different for the impact of structure, manufacturing technique and the performance of electrode, and carbon fiber paper (carbon paper), carbon cloth, non-weaving cloth and carbon black paper etc. are several electrode materials of commonly using.
At present, gas diffusion layers has use carbon fiber paper (carbon paper), also has and uses carbon cloth material.They not only have uniform Porous laminate structure, good conductivity, and chemical stability and good heat resistance and surfacing can reduce inside battery contact resistance.Existing is mainly composite carbon paper material for the carbon paper of electrode diffusion layer both at home and abroad, and it can be mixed by carbon fibre mutually by carbon fiber, wood pulp, cellulose fibre or acid polyethylene staple fibre etc., makes paper pulp, then makes carbon paper.This technique makes carbon paper, because it is in order to ensure the intensity of carbon paper, has added therein more non-conductive material, and its carbon fiber content is all lower than 90%.Therefore, cause resistivity larger, porosity and structure thereof are reasonable not.
The carbon fiber paper that fuel cell uses need to have following performance:
(1) uniform porous structure, excellent gas permeability;
(2) low resistivity, gives its high electronic conduction ability;
(3) close structure and surfacing, to reduce contact resistance, improves layer performance;
(4) there is certain mechanical strength, be beneficial to electrode fabrication;
(5) there is chemical stability and heat endurance.
At present, the manufacturing technology of fuel cell is more both at home and abroad.But the country that can produce carbon fiber paper only has indivedual advanced persons' country, and does not have one can realize small lot batch manufacture in China, what have is also in the test production phase.The production domesticization of fuel cell electrode porous diffusion layer material, by breaking the blockade of developed country to China's fuel cell critical material, for important facilitation is played in the development of China's fuel cell.
Summary of the invention
The object of the present invention is to provide a kind of preparation technology of fuel cell electrode porous diffusion layer material carbon fiber paper, carbon fiber paper can be realized batch production on common paper machine production line, and meets the needs of manufacturing fuel cell porous diffusion layer electrode.
Technical scheme of the present invention is:
A preparation technology for fuel cell electrode porous diffusion layer material carbon fiber paper, comprises the steps:
(1) surface treatment of chopped carbon fiber
Mixed liquid dipping 2-3 hour by chopped carbon fiber at acetone, second alcohol and water, by weight, acetone: ethanol: water=1:1:20, then pulls pouring dry liquids out;
Pour chopped carbon fiber into container, and add the dispersant that accounts for chopped carbon fiber gross weight 0.1-0.3%, the high-speed separation of carrying out 1000-3000 rev/min stirs, time 0.5-2 hour;
(2) surface treatment of conductive carbon black
In the ethanol water that is 5wt% in concentration by conductive carbon black, soak after 3-4 hour, together import defibrination pond with ethanol water;
(3) former wood pulp is put into pulper, former wood pulp and water ratio are 5-15%, and former wood pulp is smashed and put into defibrination pond;
(4) by the conductive carbon black of processing and former wood pulp by weight 1:(1-2), add that step (2) and step (3) gained are former to be expected in defibrination pond, and add the chopped carbon fiber of gross weight 1/3, then, carry out plasm-glue-blending for the first time, add the cationic starch that accounts for chopped carbon fiber gross weight 0.2-0.4%, start refining equipment electric current defibrination 1-2 hour at full capacity, in the time that beating degree reaches 30-40 ° of SR, and observe and can't see after chopped carbon fiber, fiberizer is decontroled, electric current reduces half, pour the half of last chopped carbon fiber gross weight into, and add the water of 1 times of added chopped carbon fiber weight, continue defibrination after 1-2 hour, fiberizer is decontroled completely, electric current is put to minimum, all pour last chopped carbon fiber into fiberizer, and add the water of 1 times of fallen chopped carbon fiber, carry out applying glue for the second time, add the cationic starch that accounts for chopped carbon fiber gross weight 0.1-0.3%,
(5) continue defibrination after 20-40 minute, all put into machine chest, and add and put into machine chest material gross weight 4-6 water doubly, start agitator, add retention agent, the 1-3% of gross weight after retention agent accounts for and adds water, after stirring, obtain pulping, in order to paper machine copy paper;
(6) papermaking machine belt water running, the felt in paper machine is wetting, in the time that the drying cylinder of paper machine reaches 80-90 DEG C, paper machine is transferred to required rotating speed 1000-3000 rev/min;
At this moment, pulping is got to a header box, and water is got to another header box, open two header box valves, after mixing with water by weight the slurry of 1:1.5-2, put into the net cage of paper machine simultaneously in mixed slurry case, and start copy paper oven dry, rolling, obtain carbon fiber paper.
The preparation technology of described fuel cell electrode porous diffusion layer material carbon fiber paper, by weight, conductive carbon black: chopped carbon fiber: former wood pulp=1:(7-8): (1-2).
The preparation technology of described fuel cell electrode porous diffusion layer material carbon fiber paper, by the weight ratio of described conductive carbon black, chopped carbon fiber, former wood pulp, adds the chopped carbon fiber of step (1) with dispersant in step (4).
The preparation technology of described fuel cell electrode porous diffusion layer material carbon fiber paper, carbon fiber paper is 80-100 gram/m
2carbon fiber paper, its porosity is 20-30%, conduction sheet resistance be 3-10 Ω/c ㎡.
The preparation technology of described fuel cell electrode porous diffusion layer material carbon fiber paper, in step (4), minimum current is 8-10A.
The invention has the beneficial effects as follows:
1, the carbon fiber paper that the present invention produces can reach porous expanding layer material and manufacture requirement, can in electrode, play the even action of support catalyst layer and stabilized electrodes structure, also possess the functions such as gas passage, electron channel and drainage channel are provided for electrode reaction, there is the structure of porous, excellent gas making, low-resistivity, high conductivity, has certain mechanical strength, chemical stability and heat endurance.
2, the present invention is before production carbon fiber paper, chopped carbon fiber and conductive carbon black are carried out to surface treatment with treatment fluid respectively, surface-treated effect is that chopped carbon fiber and conductive carbon black are softened, and remove the impurity that surface is stayed in the time of carbonization, be conducive to the paper that better dispersion is ferreted out under dispersant effect more even.
Detailed description of the invention
In the present invention, the preparation technology of fuel cell electrode porous diffusion layer material carbon fiber paper is as follows:
(1) surface treatment of chopped carbon fiber
Mixed liquid dipping 2-3 hour by chopped carbon fiber at acetone, second alcohol and water, by weight, acetone: ethanol: water=1:1:20, then pulls out and drenches dry liquids;
Pour chopped carbon fiber into container, and add the dispersant that accounts for chopped carbon fiber gross weight 0.1-0.3%, the high-speed separation of carrying out 1000-3000 rev/min stirs, time 0.5-2 hour;
(2) surface treatment of conductive carbon black
In the ethanol water that is 5wt% in concentration by conductive carbon black, soak after 3-4 hour, together import defibrination pond with ethanol water;
(3) former wood pulp is put into pulper, former wood pulp and water ratio are 5-15%, and former wood pulp is smashed and put into defibrination pond;
(4) by the conductive carbon black of processing and former wood pulp 1:(1-2 by weight), add that step (2) and step (3) gained are former to be expected in defibrination pond, and the chopped carbon fiber that adds gross weight 1/3 (by weight proportion, conductive carbon black: chopped carbon fiber: former wood pulp=1:(7-8): (1-2), add the chopped carbon fiber of step (1) with dispersant), then, carry out plasm-glue-blending for the first time, add the cationic starch that accounts for chopped carbon fiber gross weight 0.2-0.4%, start refining equipment electric current (the rated current 50-300A of motor) defibrination 1-2 hour at full capacity, in the time that beating degree (beating degree) reaches 30-40 (° SR), and observe and can't see after chopped carbon fiber, fiberizer is decontroled, electric current reduces half, pour the half of last chopped carbon fiber gross weight into, and add the water of 1 times of added chopped carbon fiber weight, continue defibrination after 1-2 hour, fiberizer is decontroled completely, electric current is put to minimum (8-10A), all pour last chopped carbon fiber into fiberizer, and add the water of 1 times of fallen chopped carbon fiber, carry out applying glue for the second time, add the cationic starch that accounts for chopped carbon fiber gross weight 0.1-0.3%,
In the present invention, from electric current at full capacity to electricity, note reduces half to refining equipment, arrive again minimum of a value 8-10A, the benefit of doing is like this: under different electric currents, defibrination pond can cut into chopped carbon fiber different length, there is certain length and chopped carbon fiber in the situation that different in size at chopped carbon fiber, can guarantee that its porosity reaches with air penetrability and reach requirement.
(5) continue defibrination after 20-40 minute, all put into machine chest, and add and put into machine chest material gross weight 4-6 water doubly, start agitator, add retention agent, the 1-3% of gross weight after retention agent accounts for and adds water, after stirring, obtain pulping, in order to paper machine copy paper;
(6) papermaking machine belt water running, the felt in paper machine is wetting, in the time that the drying cylinder of paper machine reaches 80-90 DEG C, paper machine is transferred to required rotating speed 1000-3000 rev/min;
At this moment, pulping is got to a header box, and water is got to another header box, open two header box valves, after mixing with water by weight the slurry of 1:1.5-2, put into the net cage of paper machine simultaneously in mixed slurry case, and start copy paper oven dry, rolling, can obtain 80-100 gram/m
2carbon fiber paper, its porosity is 20-30%, conduction sheet resistance be 3-10 Ω/c ㎡.
The present invention selects high conductivity, high-modulus, high-intensity chopped carbon fiber, and (as: Japanese eastern nation, east are beautiful, Taiwan is eastern beautiful etc., the manufacturer production such as domestic orchidization, Jilin Chemical), its the key technical indexes: length is 4-6mm, fibre diameter: 5-10 μ m, resistivity: 1.0-1.6 Ω cm, stretch modulus: 200-300GPa, TENSILE STRENGTH: 2000-4000MPa.
Conductive carbon black is as the functional high conductive filler of one, be mainly used in conduction and anti-static coatings, plastics, rubber, adhesive, ink, battery material, cable shield material etc., be widely used in conduction, electromagnetic shielding, the antistatic field of each industrial departments such as electronics, electromechanics, communication, printing, Aero-Space, weapons.The present invention adopts conventional conductive carbon black, as: gold the earth carbon black plant, Tianjin produces, and its conductive black series mainly contains: CD1, CD2, CD3, CD4, CD5 or CD6 etc.
Dispersant of the present invention is selected conventional polyvinyl alcohol, poly-propionic acid amine, methylcellulose, sodium carboxymethylcellulose or hydroxyethylcellulose etc.As: the WSP-5 dispersant of selecting Weifang, Shandong auspicious photoinitiator chemical Co., Ltd to produce, dispersant is colourless extremely micro-yellow transparent liquid, has certain sequestering power, is widely used in printing and dyeing, papermaking and washing agent and cleaning agent.
The present invention adopts conventional paper making equipment to produce, and this equipment is mainly pulper, fiberizer, pulp storage tank, machine chest, some ponds (water is not only saved but also environmental protection for recycling) and common cylinder paper machine.
Applying glue of the present invention adopts conventional cationic starch, as: the AKD type cationic starch that Yanzhou Tiancheng Chemical Co., Ltd. of Shandong Province produces.
Retention agent of the present invention adopts conventional Retention Aid in Papermaking, as: gloomy Retention Aid in Papermaking, Degussa Retention Aid in Papermaking or U.S. Ya Shilan Retention Aid in Papermaking etc. are liked by JNC type retention agent, France that the South Sea, Foshan Jun Neng papermaking material factory produces.
Embodiment 1
Meter by weight, 10 parts of former wood pulps, 80 parts of chopped carbon fibers, 10 parts of conductive carbon blacks.In the present embodiment, the preparation technology 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, the mixed liquid dipping of acetone, second alcohol and water 2.5 hours, by weight, acetone: ethanol: water=1:1:20, then pulled out and drenches dry liquids;
Pour chopped carbon fiber into container, and add the dispersant (methylcellulose) that accounts for chopped carbon fiber gross weight 0.2%, the high-speed separation of carrying out 2000 revs/min stirs, 1 hour time;
(2) surface treatment of conductive carbon black
In the ethanol water that is 5wt% in concentration by conductive carbon black, soak after 3.5 hours, together import defibrination pond with ethanol water;
(3) former wood pulp is put into pulper, former wood pulp and water ratio are 10%, and former wood pulp is smashed and put into defibrination pond;
(4) by the conductive carbon black of processing and former wood pulp 1:1 by weight, add that step (2) and step (3) gained are former to be expected in defibrination pond, and the chopped carbon fiber that adds gross weight 1/3 (by weight proportion, conductive carbon black: chopped carbon fiber: former wood pulp=1:8:1, adds the chopped carbon fiber of step (1) with dispersant), then, carry out plasm-glue-blending for the first time, add the cationic starch that accounts for chopped carbon fiber gross weight 0.3%, start refining equipment electric current (the rated current 100A of motor) defibrination 1.5 hours at full capacity, in the time that beating degree (beating degree) reaches 35 (° SR), and observe and can't see after chopped carbon fiber, fiberizer is decontroled, electric current reduces half, pour the half of last chopped carbon fiber gross weight into, and add the water of 1 times of added chopped carbon fiber weight, continue defibrination after 1.5 hours, fiberizer is decontroled completely, electric current is put to minimum (8-10A), all pour last chopped carbon fiber into fiberizer, and add the water of 1 times of fallen chopped carbon fiber, carry out applying glue for the second time, add the cationic starch that accounts for chopped carbon fiber gross weight 0.2%,
(5) continue defibrination after 30 minutes, all put into machine chest, and the water of 5 times of machine chest material gross weights is put in interpolation, start agitator, add Retention Aid in Papermaking (as: gloomy Retention Aid in Papermaking is liked by France), after retention agent accounts for and adds water 2% of gross weight, after stirring pulping, in order to paper machine copy paper;
(6) papermaking machine belt water running, the felt in paper machine is wetting, in the time that the drying cylinder of paper machine reaches 85 DEG C, paper machine is transferred to 2000 revs/min of required rotating speeds;
At this moment, pulping is got to a header box, and water is got to another header box, open two header box valves, after mixing with water by weight the slurry of 1:1.8, put into the net cage of paper machine simultaneously in mixed slurry case, and start copy paper oven dry, rolling, can obtain 80-100 gram/m
2carbon fiber paper, its porosity is 20-30%.
Copy 80g/m processed
2carbon fiber paper, the conduction sheet resistance of carbon fiber paper is 5 Ω/c ㎡; Copy 100g/m processed
2carbon fiber paper, the conduction sheet resistance of carbon fiber paper is 3 Ω/c ㎡.
Embodiment 2
Meter by weight, 15 parts of former wood pulps, 75 parts of chopped carbon fibers, 10 parts of conductive carbon blacks.In the present embodiment, the preparation technology 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, the mixed liquid dipping of acetone, second alcohol and water 2 hours, by weight, acetone: ethanol: water=1:1:20, then pulled out and drenches dry liquids;
Pour chopped carbon fiber into container, and add the dispersant (sodium carboxymethylcellulose) that accounts for chopped carbon fiber gross weight 0.1%, the high-speed separation of carrying out 1000 revs/min stirs, 0.5 hour time;
(2) surface treatment of conductive carbon black
In the ethanol water that is 5wt% in concentration by conductive carbon black, soak after 3 hours, together import defibrination pond with ethanol water;
(3) former wood pulp is put into pulper, former wood pulp and water ratio are 5%, and former wood pulp is smashed and put into defibrination pond;
(4) by the conductive carbon black of processing and former wood pulp 1:1.5 by weight, add that step (2) and step (3) gained are former to be expected in defibrination pond, and the chopped carbon fiber that adds gross weight 1/3 (by weight proportion, conductive carbon black: chopped carbon fiber: former wood pulp=1:7.5:1.5, adds the chopped carbon fiber of step (1) with dispersant), then, carry out plasm-glue-blending for the first time, add the cationic starch that accounts for chopped carbon fiber gross weight 0.2%, start refining equipment electric current (the rated current 80A of motor) defibrination 1 hour at full capacity, in the time that beating degree (beating degree) reaches 30 (° SR), and observe and can't see after chopped carbon fiber, fiberizer is decontroled, electric current reduces half, pour the half of last chopped carbon fiber gross weight into, and add the water of 1 times of added chopped carbon fiber weight, continue defibrination after 1 hour, fiberizer is decontroled completely, electric current is put to minimum (8-10A), all pour last chopped carbon fiber into fiberizer, and add the water of 1 times of fallen chopped carbon fiber, carry out applying glue for the second time, add the cationic starch that accounts for chopped carbon fiber gross weight 0.1%,
(5) continue defibrination after 20 minutes, all put into machine chest, and add the water of putting into 4 times of machine chest material gross weights, start agitator, add Retention Aid in Papermaking (Degussa Retention Aid in Papermaking), after retention agent accounts for and adds water 1% of gross weight, after stirring, obtain pulping, in order to paper machine copy paper;
(6) papermaking machine belt water running, the felt in paper machine is wetting, in the time that the drying cylinder of paper machine reaches 80 DEG C, paper machine is transferred to 1000 revs/min of required rotating speeds;
At this moment, pulping is got to a header box, and water is got to another header box, open two header box valves, after mixing with water by weight the slurry of 1:1.5, put into the net cage of paper machine simultaneously in mixed slurry case, and start copy paper oven dry, rolling, can obtain 80-100 gram/m
2carbon fiber paper, its porosity is 20-30%.
Copy 80g/m processed
2carbon fiber paper, the conduction sheet resistance of carbon fiber paper is 8 Ω/c ㎡; Copy 100g/m processed
2carbon fiber paper, the conduction sheet resistance of carbon fiber paper is 3 Ω/c ㎡.
Embodiment 3
Meter by weight, 20 parts of former wood pulps, 70 parts of chopped carbon fibers, 10 parts of conductive carbon blacks.In the present embodiment, the preparation technology 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, the mixed liquid dipping of acetone, second alcohol and water 3 hours, by weight, acetone: ethanol: water=1:1:20, then pulled out and drenches dry liquids;
Pour chopped carbon fiber into container, and add the dispersant (hydroxyethylcellulose) that accounts for chopped carbon fiber gross weight 0.3%, the high-speed separation of carrying out 3000 revs/min stirs, time 2 h;
(2) surface treatment of conductive carbon black
In the ethanol water that is 5wt% in concentration by conductive carbon black, soak after 4 hours, together import defibrination pond with ethanol water;
(3) former wood pulp is put into pulper, former wood pulp and water ratio are 15%, and former wood pulp is smashed and put into defibrination pond;
(4) by the conductive carbon black of processing and former wood pulp 1:2 by weight, add that step (2) and step (3) gained are former to be expected in defibrination pond, and the chopped carbon fiber that adds gross weight 1/3 (by weight proportion, conductive carbon black: chopped carbon fiber: former wood pulp=1:7:2, adds the chopped carbon fiber of step (1) with dispersant), then, carry out plasm-glue-blending for the first time, add the cationic starch that accounts for chopped carbon fiber gross weight 0.4%, start refining equipment electric current (the rated current 120A of motor) defibrination 2 hours at full capacity, in the time that beating degree (beating degree) reaches 40 (° SR), and observe and can't see after chopped carbon fiber, fiberizer is decontroled, electric current reduces half, pour the half of last chopped carbon fiber gross weight into, and add the water of 1 times of added chopped carbon fiber weight, continue defibrination after 2 hours, fiberizer is decontroled completely, electric current is put to minimum (8-10A), all pour last chopped carbon fiber into fiberizer, and add the water of 1 times of fallen chopped carbon fiber, carry out applying glue for the second time, add the cationic starch that accounts for chopped carbon fiber gross weight 0.3%,
(5) continue defibrination after 40 minutes, all put into machine chest, and the water of 6 times of machine chest material gross weights is put in interpolation, start agitator, add Retention Aid in Papermaking (U.S. Ya Shilan Retention Aid in Papermaking), after retention agent accounts for and adds water 3% of gross weight, after stirring pulping, in order to paper machine copy paper;
(6) papermaking machine belt water running, the felt in paper machine is wetting, in the time that the drying cylinder of paper machine reaches 90 DEG C, paper machine is transferred to 3000 revs/min of required rotating speeds;
At this moment, pulping is got to a header box, and water is got to another header box, open two header box valves, after mixing with water by weight the slurry of 1:2, put into the net cage of paper machine simultaneously in mixed slurry case, and start copy paper oven dry, rolling, can obtain 80-100 gram/m
2carbon fiber paper, its porosity is 20-30%.
Copy 80g/m processed
2carbon fiber paper, the conduction sheet resistance of carbon fiber paper is 10 Ω/c ㎡; Copy 100g/m processed
2carbon fiber paper, the conduction sheet resistance of carbon fiber paper is 3 Ω/c ㎡.
Claims (3)
1. a preparation technology for fuel cell electrode porous diffusion layer material carbon fiber paper, is characterized in that, comprises the steps:
(1) surface treatment of chopped carbon fiber
Mixed liquid dipping 2-3 hour by chopped carbon fiber at acetone, second alcohol and water, by weight, acetone: ethanol: water=1:1:20, then pulls pouring dry liquids out;
Pour chopped carbon fiber into container, and add the dispersant that accounts for chopped carbon fiber gross weight 0.1-0.3%, the high-speed separation of carrying out 1000-3000 rev/min stirs, time 0.5-2 hour;
(2) surface treatment of conductive carbon black
In the ethanol water that is 5wt% in concentration by conductive carbon black, soak after 3-4 hour, together import defibrination pond with ethanol water;
(3) former wood pulp is put into pulper, former wood pulp and water ratio are 5-15%, and former wood pulp is smashed and put into defibrination pond;
(4) by the conductive carbon black of processing and former wood pulp 1:(1-2 by weight), add that step (2) and step (3) gained are former to be expected in defibrination pond, and adding the chopped carbon fiber of gross weight 1/3, described chopped carbon fiber is the chopped carbon fiber with dispersant, then, carry out plasm-glue-blending for the first time, add the cationic starch that accounts for chopped carbon fiber gross weight 0.2-0.4%, start refining equipment electric current defibrination 1-2 hour at full capacity, in the time that beating degree reaches 30-40 ° of SR, and observe and can't see after chopped carbon fiber, fiberizer is decontroled, electric current reduces half, pour the half of last chopped carbon fiber gross weight into, and add the water of 1 times of added chopped carbon fiber weight, continue defibrination after 1-2 hour, fiberizer is decontroled completely, electric current is put to minimum, all pour last chopped carbon fiber into fiberizer, and add the water of 1 times of fallen chopped carbon fiber, carry out applying glue for the second time, add the cationic starch that accounts for chopped carbon fiber gross weight 0.1-0.3%,
By weight, conductive carbon black: chopped carbon fiber: former wood pulp=1:(7-8): (1-2);
(5) continue defibrination after 20-40 minute, all put into machine chest, and add and put into machine chest material gross weight 4-6 water doubly, start agitator, add retention agent, the 1-3% of gross weight after retention agent accounts for and adds water, after stirring, obtain pulping, in order to paper machine copy paper;
(6) papermaking machine belt water running, the felt in paper machine is wetting, in the time that the drying cylinder of paper machine reaches 80-90 DEG C, paper machine is transferred to required rotating speed 1000-3000 rev/min;
At this moment, pulping is got to a header box, and water is got to another header box, open two header box valves, after mixing with water by weight the slurry of 1:1.5-2, put into the net cage of paper machine simultaneously in mixed slurry case, and start copy paper oven dry, rolling, obtain carbon fiber paper.
2. according to the preparation technology of fuel cell electrode porous diffusion layer material carbon fiber paper claimed in claim 1, it is characterized in that, carbon fiber paper is 80-100 gram/m
2carbon fiber paper, its porosity is 20-30%, conduction sheet resistance be 3-10 Ω/cm
2.
3. according to the preparation technology of fuel cell electrode porous diffusion layer material carbon fiber paper claimed in claim 1, it is characterized in that, in step (4), minimum current is 8-10A.
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| CN103711022B (en) * | 2014-01-08 | 2016-03-30 | 山东天地缘实业有限公司 | A kind of carbon fiber high-strength fluting medium and preparation method thereof |
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| CN109585863B (en) * | 2018-12-14 | 2021-08-13 | 广东工业大学 | Preparation method of gas diffusion layer of proton exchange membrane fuel cell |
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| CN101994275A (en) * | 2010-09-14 | 2011-03-30 | 浙江科技学院 | Novel complex phase electromagnetic shielding-function paper and preparation method thereof |
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