CN117513051A - Method for manufacturing carbon fiber paper by dispersing carbon fibers in water - Google Patents
Method for manufacturing carbon fiber paper by dispersing carbon fibers in water Download PDFInfo
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- CN117513051A CN117513051A CN202311662173.5A CN202311662173A CN117513051A CN 117513051 A CN117513051 A CN 117513051A CN 202311662173 A CN202311662173 A CN 202311662173A CN 117513051 A CN117513051 A CN 117513051A
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- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 215
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 215
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 174
- 238000000034 method Methods 0.000 title claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 239000011347 resin Substances 0.000 claims abstract description 42
- 229920005989 resin Polymers 0.000 claims abstract description 42
- 239000002243 precursor Substances 0.000 claims abstract description 40
- 239000000725 suspension Substances 0.000 claims abstract description 26
- 239000011230 binding agent Substances 0.000 claims abstract description 21
- 238000003763 carbonization Methods 0.000 claims abstract description 19
- 239000002270 dispersing agent Substances 0.000 claims abstract description 16
- 125000002091 cationic group Chemical group 0.000 claims abstract description 13
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 13
- 238000007731 hot pressing Methods 0.000 claims abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 229920002472 Starch Polymers 0.000 claims description 11
- 239000005011 phenolic resin Substances 0.000 claims description 11
- 235000019698 starch Nutrition 0.000 claims description 11
- 239000008107 starch Substances 0.000 claims description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 4
- 229920001568 phenolic resin Polymers 0.000 claims description 4
- 229920001187 thermosetting polymer Polymers 0.000 abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052799 carbon Inorganic materials 0.000 abstract description 10
- 239000006185 dispersion Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 10
- 238000005470 impregnation Methods 0.000 abstract description 2
- 239000000446 fuel Substances 0.000 description 12
- 239000002994 raw material Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 238000011161 development Methods 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 7
- 125000000524 functional group Chemical group 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 239000012528 membrane Substances 0.000 description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 description 5
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000003487 electrochemical reaction Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000004626 scanning electron microscopy Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- -1 current Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003411 electrode reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
- D21H13/46—Non-siliceous fibres, e.g. from metal oxides
- D21H13/50—Carbon fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- 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
-
- 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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
The invention relates to a method for manufacturing carbon fiber paper by dispersing carbon fibers in water, which comprises the steps of dispersing the carbon fibers in water, and adding a dispersing agent to uniformly disperse the carbon fibers; adding a binder into the dispersed carbon fiber suspension to make carbon fiber paper base paper; impregnating the carbon fiber paper precursor obtained by papermaking with resin and hot-pressing; and (5) preparing the carbon fiber paper by high-temperature carbonization. According to the invention, the cationic polyacrylamide is added into the carbon fiber suspension, so that the dispersion effect of the carbon fibers in the suspension is obviously improved; the binder is added into the dispersed carbon fibers to obtain a formed carbon fiber paper precursor, and thermosetting resin is used for impregnation, so that the mechanical property of the carbon fiber paper is improved after carbonization, and meanwhile, part of thermosetting resin can become resin carbon after high-temperature carbonization, so that the bonding of the carbon fibers is facilitated, and meanwhile, the conductivity of the carbon fiber paper is improved.
Description
Technical Field
The invention relates to a method for manufacturing carbon fiber paper by dispersing carbon fibers in water, belonging to the technical field of carbon fiber material application.
Background
With the development of social civilization, the world economy is developed at a high speed, but in the process of economic growth, human beings consume a large amount of non-renewable resources, such as fossil fuels of coal, petroleum, natural gas and the like, and then the problems of energy resource shortage crisis, environmental pollution, increasingly serious greenhouse effect and the like are generated. Energy crisis and environmental problems form a serious threat to the sustainable development of world energy. Therefore, for changing the utilization mode of high pollution of the traditional fossil energy, improving and optimizing the cost and limitation of renewable energy, establishing the harmony between people and nature for realizing sustainable development of human society, researching and developing clean renewable new energy, and developing low-carbon economy becomes the key research and development direction of energy utilization in the current world.
The hydrogen energy is regarded as the clean energy with the most development potential in the 21 st century, is regarded as the subversion technical direction of the energy revolution in the future, has high combustion heat value, is clean and efficient, has rich resources and is a sustainable new energy. The hydrogen fuel cell is a main utilization mode of hydrogen energy, and takes hydrogen as fuel, and chemical energy of the hydrogen and oxygen is directly converted into electric energy through electrochemical reaction. Fuel cell electric vehicles are one of the most effective paths for reducing greenhouse gas emissions and reducing oil usage.
The proton exchange membrane fuel cell has the characteristics of high energy conversion efficiency, zero emission, clean and pollution-free reaction, high starting speed, low working temperature, long service life, convenient installation and operation and the like, is a clean renewable energy source utilization mode with high conversion efficiency, is one of the main directions of world energy development, is often considered as an ideal candidate power supply for a series of fixed and mobile applications, and is applied to the fields of electric automobiles, submarines, mobile equipment, distributed power stations and the like.
Although there is a fundamental theoretical basis for proton exchange membrane fuel cells, proton exchange membrane fuel cells have not found widespread use. The proton exchange membrane fuel cell comprises four key material components of a bipolar plate, a gas diffusion layer, a proton exchange membrane and a catalytic base layer, and the components are difficult to manufacture and process and have high production cost, thus being the root cause of difficult wide application.
The gas diffusion layer is an important component of the proton exchange membrane fuel cell, plays a role in supporting the catalyst layer, supporting the catalyst layer and stabilizing the motor structure, and more importantly plays a role in diffusing gas, current, water and heat conduction, provides a gas channel for electrode reaction and a channel for generating water, and also has relatively good electric conduction performance and corrosion resistance under electrochemical reaction. The properties of the diffusion layer material will directly influence the progress of the electrochemical reaction and the operating efficiency of the cell.
The gas diffusion layer is composed of a base layer and a microporous layer. The substrate layer is mainly composed of hydrophobic treated carbon fiber paper or carbon fiber cloth, because the high conductivity and porous structure of the hydrophobic treated carbon fiber paper or carbon fiber cloth can meet the requirement of high porosity of the diffusion layer, can well circulate gas and product water, and can transport electrons. Carbon fiber paper is the most widely used substrate layer. The carbon fiber paper has a porous structure, high porosity, good conductivity, high temperature resistance and corrosion resistance, and can meet the running condition and performance requirements of the fuel cell.
The carbon fiber paper is a paper-shaped material prepared by taking carbon fibers as a main material and assisting with an adhesive through a paper making process. The carbon fiber is a novel carbon material with carbon content of more than 93% prepared by high-temperature carbonization at 1300-1600 ℃, the carbon fiber has a graphite disordered layer structure, and carbon-carbon is connected by nonpolar covalent bonds, so that the carbon fiber has few surface functional groups and content, low activity and hydrophobicity and is not easy to wet by water, and therefore, the fiber is difficult to disperse and is easy to reagglomerate after being dispersed.
The technology of manufacturing carbon fiber paper by China starts later, and the market development is slow due to insufficient product supply, so that the technology required for producing the gas diffusion layer needs to be optimized while the complete processing line is developed to ensure the production and supply requirements, and the production method and the internal structure thereof are improved. Because the fuel cell industry in China starts later, the key material foundation is weak, and the industrial chain development is incomplete, the development of the hydrogen fuel cell industry in China is greatly restricted.
Disclosure of Invention
The invention aims to provide a method for manufacturing carbon fiber paper by dispersing carbon fibers in water, wherein the dispersing effect of the carbon fiber paper is improved in the preparation process by adopting more effective and more common dispersing agents and binders, so that the mechanical property of the carbon fiber paper is improved after carbonization, and the conductivity of the carbon fiber paper can be improved.
The technical scheme adopted by the invention is as follows: a method for manufacturing carbon fiber paper by dispersing carbon fibers in water is characterized by comprising the following steps: (1) Dispersing carbon fibers in water, and adding a dispersing agent to uniformly disperse the carbon fibers to obtain a carbon fiber suspension; (2) Adding a binder into the dispersed carbon fiber suspension to make carbon fiber paper base paper; (3) Impregnating the carbon fiber paper precursor obtained by papermaking with resin and hot-pressing; (4) preparing carbon fiber paper by high-temperature carbonization.
The method for manufacturing the carbon fiber paper by dispersing the carbon fibers in water is characterized in that the carbon fibers have the ration of 90-120 g/m 2 Between them.
The method for manufacturing the carbon fiber paper by dispersing the carbon fibers in the water is characterized in that the proportion of the carbon fibers dispersed in the water is 1:800-1200.
The method for manufacturing the carbon fiber paper by dispersing the carbon fibers in water is characterized in that the dispersing agent is cationic polyacrylamide, and the mass fraction of the cationic polyacrylamide is between 0.5 and 2 percent (based on the mass of the carbon fiber suspension).
The method for manufacturing the carbon fiber paper by dispersing the carbon fibers in water is characterized in that the binder adopts starch, and the mass of the starch is 2-4 g (based on the mass of the carbon fibers).
The method for manufacturing the carbon fiber paper by dispersing the carbon fibers in water is characterized in that the resin is one of phenol resin, bark resin and phenolic resin.
The method for manufacturing the carbon fiber paper by dispersing the carbon fibers in water is characterized in that the carbon fiber paper precursor is immersed in the resin for 4-6 hours.
The method for manufacturing the carbon fiber paper by dispersing the carbon fibers in water is characterized by carrying out high-temperature carbonization in a nitrogen environment at 1600-2000 ℃.
The invention has the beneficial effects that the cationic polyacrylamide is added into the carbon fiber suspension, so that the dispersion effect of the carbon fiber in the suspension is obviously improved compared with the suspension without the dispersing agent; the binder is added into the dispersed carbon fiber suspension, compared with the carbon fiber suspension without any binder, after the carbon fiber suspension is filtered and dried, the carbon fiber paper precursor can not be obtained after formation, the formed carbon fiber paper precursor can be obtained, and the carbon fiber paper is impregnated by using thermosetting resin, so that the mechanical property of the carbon fiber paper is improved after carbonization, and meanwhile, part of the thermosetting resin can become resin carbon after high-temperature carbonization, thereby being beneficial to the adhesion of carbon fibers and improving the conductivity of the carbon fiber paper.
Drawings
FIG. 1 is a graph showing the dispersion effect of carbon fibers according to the present invention;
FIG. 2 is a cut-out appearance of a carbon fiber paper precursor manufactured by the method of the invention;
FIG. 3 is a cut-out appearance of a resin impregnated carbon fiber paper precursor according to the present invention;
FIG. 4 is a cut-out appearance of the carbonized carbon fiber paper of the present invention;
fig. 5 is a drawing showing a tensile strength test chart of the carbon fiber paper obtained by using a servo material multifunctional high-low temperature control tester according to the present invention, respectively testing the prepared carbon fiber paper precursor, the carbon fiber paper precursor after resin impregnation, and the carbon fiber paper obtained after carbonization.
FIG. 6 is a second drawing of tensile strength test of the carbon fiber paper obtained by the present invention, the carbon fiber paper precursor impregnated with resin, and the carbon fiber paper obtained by carbonization, respectively, using a servo material multifunctional high and low temperature control tester.
FIG. 7 is a third drawing showing the tensile strength test of the carbon fiber paper obtained by the present invention, the carbon fiber paper precursor impregnated with resin, and the carbon fiber paper obtained by carbonization, respectively, using a servo material multifunctional high and low temperature control tester.
Fig. 8 is a diagram showing the morphology of raw material carbon fiber and carbonized carbon fiber paper, respectively, by scanning electron microscopy.
FIG. 9 is a second view showing the morphology of a raw material carbon fiber and carbonized carbon fiber paper, respectively, by scanning electron microscopy.
Detailed Description
The following description of the present invention will be provided in full detail with reference to specific embodiments of the present invention, which are only some, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
1. The specific steps of the invention are as follows.
1. Firstly, dispersing raw material carbon fibers in water, and adding cationic polyacrylamide to uniformly disperse the carbon fibers, wherein the uniformly dispersed carbon fibers are beneficial to manufacturing carbon fiber paper with more excellent performance; therefore, the dispersion effect of the chopped carbon fibers in water is optimized, namely the uniform dispersion effect of the chopped carbon fibers in the prepared carbon fiber paper is better improved, so that a series of key properties such as uniformity, strength, porosity, air permeability and the like of the carbon fiber paper product are more in line with the product requirements.
2. Step two, adding a binder into the dispersed carbon fiber suspension; because of the special structure of the carbon fiber, carbon-carbon is connected by nonpolar covalent bonds, so that the types and the content of surface functional groups are less, compared with the plant fiber paper making process, the plant fiber is rich in hydrophilic functional groups, so that the plant fiber can more easily achieve the expected dispersing effect in the dispersing process, and the functional groups of the plant fiber play a great role in the carbon fiber paper forming process, so that the addition of the binder is very necessary in the carbon fiber base paper making process.
3. Step three, impregnating the carbon fiber base paper obtained by papermaking with thermosetting resin, and hot-pressing a carbon fiber paper precursor; resins such as phenol resin, barking resin, phenolic resin and the like show good bonding performance with carbon fibers at normal temperature, after carbonization at high temperature, except for part of components being burnt out, the rest carbonizable part becomes resin carbon, the resin carbon has good conductivity and keeps good bonding effect on the carbon fibers, the carbonized carbon paper is endowed with good strength, when thermosetting resin is selected, hot pressing treatment is needed, on one hand, the thermosetting resin is solidified, on the other hand, the carbon paper is endowed with better surface flatness, and the uniformity of thickness is improved.
4. Preparing carbon fiber paper by high-temperature carbonization; the carbon fiber paper has the requirement of good conductivity in proton exchange membrane fuel cells, so the carbon fiber paper has to be subjected to high-temperature heat treatment to meet the requirement of conductivity, various elements in phenolic resin are released in the form of water, methane, carbon monoxide, carbon dioxide and the like in the carbonization process, and simultaneously the resin is carbonized and contracted. The process improves the conductivity of the carbon fiber paper, and greatly increases the porosity and air permeability of the carbon fiber paper.
2. Embodiment one.
The technical scheme adopted by the invention is a wet papermaking process, and a more effective and more common dispersing agent and binder are adopted, and the preparation method for making the carbon fiber paper by using the carbon fiber comprises the following specific processes:
weighing the mixture to a quantitative ratio of 120g/m 2 The raw material carbon fiber required by the carbon fiber paper is dispersed in water (the mass ratio of the carbon fiber to the water is 1:1000), the raw material carbon fiber is completely dispersed in a standard fluffer, the mass fraction of the cationic polyacrylamide added with a dispersing agent is 2.0 percent (based on the mass of a carbon fiber suspension), the binder is starch with the mass of 3g (based on the mass of the carbon fiber), and because of the special structure of the carbon fiber, carbon-carbon are connected by a nonpolar covalent bond, so that the surface functional group type and the content are less, and the addition of starch in the paper making process is more beneficial to the formation of the precursor of the carbon fiber paper. And drying the obtained carbon fiber paper precursor by using a paper former when the dispersion is complete. And (3) impregnating thermosetting resin, and impregnating the carbon fiber paper precursor in phenol resin for 5 hours to fully impregnate the carbon fiber paper precursor with the resin. And (3) placing the fully impregnated carbon fiber paper precursor in a flat vulcanizing machine for hot pressing to fully solidify the resin, and simultaneously leveling the surface of the carbon fiber paper. The solidified carbon fiber paper precursor is placed in a tube furnace and carbonized at a high temperature of 1800 ℃ in a nitrogen environment.
3. Embodiment two.
The technical scheme adopted by the invention is a wet papermaking process, and a more effective and more common dispersing agent and binder are adopted, and the preparation method for making the carbon fiber paper by using the carbon fiber comprises the following specific processes:
weighing the mixture to a quantitative ratio of 110g/m 2 The raw material carbon fiber required by the carbon fiber paper is dispersed in water (the mass ratio of the carbon fiber to the water is 1:800), the raw material carbon fiber is completely dispersed in a standard fluffer, the mass fraction of the cationic polyacrylamide added with a dispersing agent is 1.5 percent (based on the mass of a carbon fiber suspension), the binder is starch with the mass of 3g (based on the mass of the carbon fiber), and because of the special structure of the carbon fiber, the carbon-carbon is connected by a nonpolar covalent bond, so that the surface functional group type and the content are less, and the addition of starch in the paper making process is more beneficial to the formation of the carbon fiber paper precursor. Drying the carbon obtained by a sheet former until the dispersion is completedA fibrous paper precursor. And (3) impregnating thermosetting resin, and impregnating the carbon fiber paper precursor in phenol resin for 4 hours to fully impregnate the carbon fiber paper precursor with the resin. And (3) placing the fully impregnated carbon fiber paper precursor in a flat vulcanizing machine for hot pressing to fully solidify the resin, and simultaneously leveling the surface of the carbon fiber paper. The solidified carbon fiber paper precursor is placed in a tube furnace and carbonized at a high temperature of 1600 ℃ in a nitrogen environment.
4. Embodiment three.
The technical scheme adopted by the invention is a wet papermaking process, and a more effective and more common dispersing agent and binder are adopted, and the preparation method for making the carbon fiber paper by using the carbon fiber comprises the following specific processes:
weighing the mixture to a quantitative ratio of 100g/m 2 The raw material carbon fiber required by the carbon fiber paper is dispersed in water (the mass ratio of the carbon fiber to the water is 1:1200), the raw material carbon fiber is completely dispersed in a standard fluffer, the mass fraction of the cationic polyacrylamide added with a dispersing agent is 1.0 percent (based on the mass of a carbon fiber suspension), the binder is starch with the mass of 3g (based on the mass of the carbon fiber), and because of the special structure of the carbon fiber, the carbon-carbon is connected by a nonpolar covalent bond, so that the surface functional group type and the content are less, and the addition of starch in the paper making process is more beneficial to the formation of the carbon fiber paper precursor. And drying the obtained carbon fiber paper precursor by using a paper former when the dispersion is complete. And (3) impregnating thermosetting resin, and impregnating the carbon fiber paper precursor in phenol resin for 6 hours to fully impregnate the carbon fiber paper precursor with the resin. And (3) placing the fully impregnated carbon fiber paper precursor in a flat vulcanizing machine for hot pressing to fully solidify the resin, and simultaneously leveling the surface of the carbon fiber paper. The solidified carbon fiber paper precursor is placed in a tube furnace and carbonized at a high temperature of 2000 ℃ in a nitrogen environment.
5. Example four.
The technical scheme adopted by the invention is a wet papermaking process, and a more effective and more common dispersing agent and binder are adopted, and the preparation method for making the carbon fiber paper by using the carbon fiber comprises the following specific processes: weighing the mixture to a quantitative ratio of 90g/m 2 Raw material carbon fiber required for carbon fiber paper of (2), and is processed intoDispersing in water (the mass ratio of the carbon fiber to the water is 1:1000), completely dispersing in a standard fluffer, adding a dispersing agent, namely cationic polyacrylamide, wherein the mass fraction of the cationic polyacrylamide is 0.5 percent (based on the mass of a carbon fiber suspension), and selecting 3g of starch (based on the mass of the carbon fiber) as a binder. And drying the obtained carbon fiber paper precursor by using a paper former when the dispersion is complete. And (3) impregnating thermosetting resin, and impregnating the carbon fiber paper precursor in phenol resin for 5 hours to fully impregnate the carbon fiber paper precursor with the resin. And (3) placing the fully impregnated carbon fiber paper precursor in a flat vulcanizing machine for hot pressing to fully solidify the resin, and simultaneously leveling the surface of the carbon fiber paper. The solidified carbon fiber paper precursor is placed in a tube furnace and carbonized at a high temperature of 1800 ℃ in a nitrogen environment.
6. Conclusion (d).
As can be seen from fig. 1 to 9, the addition of the cationic polyacrylamide to the carbon fiber suspension results in a significantly improved dispersion of the carbon fibers in the suspension compared to the suspension without the dispersant; the binder is added into the dispersed carbon fiber suspension, compared with the carbon fiber suspension without any binder, after the carbon fiber suspension is filtered and dried, the carbon fiber paper precursor can not be obtained after formation, the formed carbon fiber paper precursor can be obtained, and the carbon fiber paper is impregnated by using thermosetting resin, so that the mechanical property of the carbon fiber paper is improved after carbonization, and meanwhile, part of the thermosetting resin can become resin carbon after high-temperature carbonization, thereby being beneficial to the adhesion of carbon fibers and improving the conductivity of the carbon fiber paper.
Claims (8)
1. A method for manufacturing carbon fiber paper by dispersing carbon fibers in water is characterized by comprising the following steps: (1) Dispersing carbon fibers in water, and adding a dispersing agent to uniformly disperse the carbon fibers to obtain a carbon fiber suspension; (2) Adding a binder into the dispersed carbon fiber suspension to make carbon fiber paper base paper; (3) Impregnating the carbon fiber paper precursor obtained by papermaking with resin and hot-pressing; (4) preparing carbon fiber paper by high-temperature carbonization.
2. The method for manufacturing carbon fiber paper by dispersing carbon fiber in water according to claim 1, characterized in that the carbon fiber has a ration of 90-120 g/m 2 Between them.
3. The method for manufacturing the carbon fiber paper by dispersing the carbon fibers in the water according to claim 1, wherein the proportion of the carbon fibers dispersed in the water is 1:800-1200.
4. The method for manufacturing the carbon fiber paper by dispersing the carbon fibers in water according to claim 1, wherein the dispersing agent is cationic polyacrylamide, and the mass fraction of the cationic polyacrylamide is between 0.5 and 2 percent (based on the mass of the carbon fiber suspension).
5. The method for manufacturing the carbon fiber paper by dispersing the carbon fibers in water according to claim 1, wherein the binder is starch, and the mass of the starch is 2-4 g (based on the mass of the carbon fibers).
6. The method for making a carbon fiber paper as defined in claim 1, wherein the resin is one of a phenol resin, a bark resin, and a phenolic resin.
7. The method for manufacturing the carbon fiber paper by dispersing the carbon fibers in water according to claim 1, wherein the carbon fiber paper precursor is immersed in the resin for 4-6 hours.
8. The method for manufacturing the carbon fiber paper by dispersing the carbon fibers in water according to claim 1, wherein high-temperature carbonization is performed in a nitrogen environment at 1600-2000 ℃.
Priority Applications (1)
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