CN114293401B - Carbon fiber dispersion liquid, method for producing same, gas diffusion layer, and fuel cell - Google Patents
Carbon fiber dispersion liquid, method for producing same, gas diffusion layer, and fuel cell Download PDFInfo
- Publication number
- CN114293401B CN114293401B CN202111675754.3A CN202111675754A CN114293401B CN 114293401 B CN114293401 B CN 114293401B CN 202111675754 A CN202111675754 A CN 202111675754A CN 114293401 B CN114293401 B CN 114293401B
- Authority
- CN
- China
- Prior art keywords
- carbon fiber
- dispersion liquid
- dispersant
- fiber dispersion
- radiation treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Landscapes
- Paper (AREA)
Abstract
The invention relates to a carbon fiber dispersion liquid and a preparation method thereof, a gas diffusion layer and a fuel cell, wherein the preparation method of the carbon fiber dispersion liquid comprises the following steps: mixing a dispersing agent and water, and then carrying out radiation treatment to obtain a dispersing agent solution subjected to radiation treatment; the dispersant is selected from at least one of hydroxypropyl methyl cellulose, cyanoethyl cellulose and carboxymethyl hydroxyethyl cellulose; and mixing the dispersant solution and the carbon fibers to obtain a carbon fiber dispersion liquid. Through mixing a specific kind of dispersant with water, after the obtained dispersant aqueous solution is subjected to radiation treatment, the structure of the dispersant in the dispersant aqueous solution can be changed, so that the dispersant in the dispersant solution can be adsorbed on the surface of carbon fibers when the dispersant is mixed with the carbon fibers, the hydrophilicity of the surface of the carbon fibers is effectively improved, and the dispersibility of the carbon fibers in water is improved. The carbon fiber dispersion liquid prepared by the preparation method of the carbon fiber dispersion liquid is used for preparing carbon fiber paper, and the carbon fiber paper has good uniformity.
Description
Technical Field
The invention relates to the field of fuel cells, in particular to a carbon fiber dispersion liquid, a preparation method thereof, a gas diffusion layer and a fuel cell.
Background
The proton exchange membrane fuel cell is a power generation device which converts the chemical energy of hydrogen fuel and oxidant into electric energy, the energy efficiency is not limited by Carnot cycle, and the proton exchange membrane fuel cell has the characteristics of high efficiency, cleanness and the like. The proton exchange membrane fuel cell has a very wide development prospect as a novel clean energy.
The gas diffusion layer is a key core material of the proton exchange membrane fuel cell, and the carbon fiber paper is a commonly used substrate material of the gas diffusion layer. The carbon fiber paper has a uniform porous thin layer, has good porosity and air permeability, and has excellent properties of low density, high thermal conductivity, high toughness, high strength, high temperature resistance, impact resistance, corrosion and radiation resistance, low thermal expansion coefficient and the like.
The carbon fiber paper is usually formed on a paper machine by adopting a wet papermaking process, mixing an adhesive with carbon fibers and utilizing a papermaking technology. However, the carbon fiber surface has hydrophobicity and is difficult to disperse uniformly in water, which further affects the uniformity of the carbon fiber paper, and thus the strength of the carbon fiber paper. In order to improve the dispersibility of the carbon fibers in water, a conventional method is to add surfactants such as sodium alkyl sulfate and tween into an aqueous solution of the carbon fibers, which can improve the dispersibility of the carbon fibers in water to some extent, but the dispersing effect is limited.
Therefore, the carbon fiber dispersion liquid with good dispersion effect and the preparation method thereof have important significance.
Disclosure of Invention
Based on this, the present invention provides a method for producing a carbon fiber dispersion liquid that effectively improves the dispersibility of carbon fibers in water, a carbon fiber dispersion liquid, a gas diffusion layer, and a fuel cell.
The technical scheme of the invention for solving the technical problems is as follows.
A method for preparing a carbon fiber dispersion, comprising the steps of:
mixing a dispersant and water, and then carrying out radiation treatment to obtain a dispersant solution subjected to radiation treatment; the dispersing agent is selected from at least one of hydroxypropyl methyl cellulose, cyanoethyl cellulose and carboxymethyl hydroxyethyl cellulose;
and mixing the dispersant solution and the carbon fibers to obtain a carbon fiber dispersion liquid.
In some of the embodiments, the carbon fiber dispersion is prepared by a method in which the radiation treatment has an energy of 0.5MeV to 10MeV, a power of 10KW to 20KW, and a time of 10min to 20 min.
In some of these embodiments, the carbon fiber dispersion is prepared by a method wherein the radiation source of the radiation treatment is selected from the group consisting of electron beam and gamma ray.
In some embodiments, in the method for preparing the carbon fiber dispersion, the mass percentage concentration of the dispersant solution is 0.005-5%.
In some embodiments, in the preparation method of the carbon fiber dispersion liquid, the mass ratio of the carbon fibers to the dispersant solution is 1 (1-50).
In some embodiments, in the preparation method of the carbon fiber dispersion, in the step of mixing the dispersant solution and the carbon fibers, an antifoaming agent is further added, and the antifoaming agent is at least one selected from the group consisting of glycerol polyether, polyoxyethylene ether, polyoxypropylene ether and polypropylene glycol.
The invention provides a carbon fiber dispersion liquid which is prepared by the preparation method of the carbon fiber dispersion liquid.
The invention also provides carbon fiber paper, and the preparation raw material of the carbon fiber paper comprises the carbon fiber dispersion liquid.
The invention also provides a gas diffusion layer which comprises the carbon fiber paper.
The invention also provides a fuel cell, and an electrode of the fuel cell comprises the gas diffusion layer.
Compared with the prior art, the preparation method of the carbon fiber dispersion liquid has the following beneficial effects:
according to the preparation method of the carbon fiber dispersion liquid, the specific dispersant is mixed with water, after the obtained dispersant aqueous solution is subjected to radiation treatment, the structure of the dispersant in the dispersant aqueous solution is changed, atoms of the dispersant are rearranged to form an aromatic structure, and stronger van der Waals acting force can be formed between the atoms of the dispersant and carbon-carbon double bonds on the surface of carbon fibers; and when the carbon fiber is mixed with the dispersant, the dispersant in the dispersant solution can be adsorbed on the surface of the carbon fiber, so that the hydrophilicity of the surface of the carbon fiber is effectively improved, and the dispersibility of the carbon fiber in water is improved. The carbon fiber dispersion liquid prepared by the preparation method of the carbon fiber dispersion liquid is used for preparing carbon fiber paper, and the carbon fiber paper has good uniformity and high tensile strength and bending strength.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the following specific examples. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The weight of the related components mentioned in the description of the embodiments of the present invention may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, the content of the related components is scaled up or down within the scope disclosed in the description of the embodiments of the present invention as long as it is in accordance with the description of the embodiments of the present invention. Specifically, the weight described in the description of the embodiments of the present invention may be a mass unit known in the chemical field, such as μ g, mg, g, kg, etc.
An embodiment of the present invention provides a method for preparing a carbon fiber dispersion, including the following steps S10 to S20.
Step S10: mixing a dispersing agent and water, and then carrying out radiation treatment to obtain a dispersing agent solution subjected to radiation treatment; wherein the dispersant is selected from hydroxypropyl methylcellulose (HPMC), cyanoethylcellulose (CEC) and carboxymethyl hydroxyethyl cellulose (CMHFC).
In some preferred examples, the dispersant is cyanoethyl cellulose in step S10.
In some examples, the energy of the radiation treatment is 0.5MeV to 10MeV, the power is 10KW to 20KW, and the time is 10min to 20min in step S10.
In some examples, the radiation source of the radiation treatment in step S10 is selected from electron rays or gamma rays. It is understood that the energy of the gamma ray is higher than 1.24MeV, in other words, when the gamma ray is used for the radiation treatment, the energy of the radiation treatment is higher than 1.24MeV and less than or equal to 10 MeV.
In some examples, in step S10, the radiation source of the radiation treatment is an electron beam.
(ii) a Optionally, the energy of the radiation treatment is 1 MeV-10 MeV, the power is 10 KW-20 KW, and the time is 10 min-15 min; furthermore, the energy of the radiation treatment is 1 MeV-10 MeV, the power is 15 KW-20 KW, and the time is 10 min-15 min.
In some of the preferred examples, the energy of the radiation treatment in the carbon fiber dispersion is 1MeV, the power is 20KW and the time is 15 min.
In some examples, in step S10, the dispersant solution has a mass percentage concentration of 0.005% to 5%; further, the mass percent concentration of the dispersant solution is 0.01-1%; optionally, the dispersant solution has a mass percent concentration of 0.02% to 0.1%.
In some preferred examples, the dispersant solution is 0.02% by mass in step S10.
In some examples, the dispersant and hot water are mixed and stirred in step S10, and then cold water is added to continue stirring, cooling, and then radiation treatment is performed.
Step S20: and mixing the dispersant solution and the carbon fibers to obtain a carbon fiber dispersion liquid.
Through mixing a specific kind of dispersant with water, after the obtained dispersant aqueous solution is subjected to radiation treatment, the structure of the dispersant in the dispersant aqueous solution is changed, atoms of the dispersant are rearranged to form an aromatic structure, and stronger van der Waals acting force can be formed between the atoms of the dispersant and carbon-carbon double bonds on the surface of carbon fibers; and when the carbon fiber is mixed with the dispersant, the dispersant in the dispersant solution can be adsorbed on the surface of the carbon fiber, so that the hydrophilicity of the surface of the carbon fiber is effectively improved, and the dispersibility of the carbon fiber in water is improved. The carbon fiber dispersion liquid prepared by the preparation method of the carbon fiber dispersion liquid is used for preparing carbon fiber paper, and the carbon fiber paper has good uniformity and high tensile strength and bending strength.
The inventor of the present application has also tried to use other commonly used dispersants, such as sodium dodecylbenzene sulfonate (SDBS), sodium hexadecyl sulfonate, tween 80, etc., for the dispersion of carbon fibers after electron irradiation treatment, however, such dispersants do not generate structural change under the action of electron irradiation, and have limited promotion effect on the dispersion of carbon fibers in water. The analysis shows that the molecular weight of dispersing agents such as sodium dodecyl benzene sulfonate, sodium hexadecylsulfonate, tween 80 and the like is small, so that the dispersing agents are not easy to generate structural change under the action of electron radiation, the intermolecular interaction of the dispersing agents is greater than the interaction between the dispersing agents and carbon fibers, the dispersing agents are not easy to adsorb on the surfaces of the carbon fibers and only play a role in physically isolating the carbon fibers, so that the promotion effect on the dispersion of the carbon fibers in water is limited, and uniform and stable carbon fiber aqueous dispersion cannot be formed.
In some examples, in the step S20, the mass ratio of the carbon fibers to the dispersant solution is 1 (1-50); furthermore, the mass ratio of the carbon fiber to the dispersant solution is 1 (1-20).
In some examples, in the step S20, the mass ratio of the carbon fibers to the dispersant solution is 1 (1-8); optionally, the mass ratio of the carbon fibers to the dispersing agent is 1 (2-4).
In some preferred examples, the mass ratio of the carbon fibers to the dispersant solution is 1:4 in step S20.
In some examples, in step S20, the carbon fibers are slowly added to the dispersant solution.
In some examples, in step S20, after mixing the carbon fibers and water, a dispersant solution is added.
In some examples, in step S20, after the dispersant solution and the carbon fibers are mixed, first stirring is performed.
In some examples, in step S20, the first stirring is mechanical stirring, the rotation speed of the stirrer is 500r/min to 10000r/min, and the stirring time is 1min to 400 min; optionally, the rotating speed of the stirrer is 500 r/min-1000 r/min, and the stirring time is 10 min-30 min; furthermore, the rotating speed of the stirrer is 600r/min, and the stirring time is 20 min.
In some examples, in step S20, in the step of mixing the dispersant solution and the carbon fibers, a defoaming agent is further added, and the defoaming agent is selected from at least one of glycerol polyether, polyoxyethylene ether, polyoxypropylene ether and polypropylene glycol.
In some examples, in step S20, the defoaming agent is selected from at least one of polyoxyethylene ether and polyoxypropylene ether.
In some examples, in step S20, the mass percentage concentration of the defoaming agent when added is 0.03% to 10%.
In some examples, in step S20, after the dispersant solution and the carbon fibers are mixed for the first stirring, the antifoaming agent is further added for the second stirring.
In some examples, in step S20, the second stirring is mechanical stirring, the rotation speed of the stirrer is 500r/min to 10000r/min, and the stirring is carried out until the carbon fiber dispersion liquid has no bubbles; optionally, the rotating speed of the stirrer is 800 r/min-1200 r/min; further, the rotating speed of the stirrer is 1000 r/min.
After being mixed with water, the dispersant of a specific kind is radiated under specific conditions, and is further mixed with the carbon fiber aqueous dispersion and the defoamer according to a specific proportion, and the components and the process have synergistic effect, so that the dispersibility of the carbon fibers in the water is effectively improved.
One embodiment of the invention provides carbon fiber paper, and the preparation raw material of the carbon fiber paper comprises the carbon fiber dispersion liquid.
An embodiment of the present invention provides an application of the carbon fiber dispersion liquid in the preparation of a carbon fiber product. Another embodiment of the present invention provides a carbon fiber paper, which is prepared from the above carbon fiber dispersion.
The carbon fiber dispersion liquid is used for preparing carbon fiber paper, and can endow the carbon fiber paper with better uniformity and higher strength.
An embodiment of the invention provides a gas diffusion layer, which comprises the carbon fiber paper.
In some of these embodiments, the gas diffusion layer comprises the carbon paper described above, i.e., the gas diffusion layers are all the carbon papers described above. In other embodiments, the gas diffusion layer may include other materials in addition to the carbon paper described above.
An embodiment of the present invention provides a membrane electrode assembly comprising a catalyst coated membrane and a gas diffusion layer as described above. It can be understood that the catalyst coating film comprises an anode catalyst layer, a cathode catalyst layer and a proton exchange membrane, the anode catalyst layer and the cathode catalyst layer are respectively sprayed on two sides of the proton exchange membrane, and gas diffusion layers are respectively arranged on the sides, far away from the proton exchange membrane, of the anode catalyst layer and the cathode catalyst layer in the catalyst coating film.
The invention provides a fuel cell, which comprises an anode plate, a cathode plate and the membrane electrode assembly, wherein the anode plate and the cathode plate are arranged on two sides of the membrane electrode assembly.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Hereinafter, the carbon fiber dispersion liquid and the method of preparing the same, the gas diffusion layer, and the fuel cell according to the present invention are exemplified, and it is understood that the carbon fiber dispersion liquid and the method of preparing the same, the gas diffusion layer, and the fuel cell according to the present invention are not limited to the following examples.
Example 1
(1) Preparing cyanoethyl cellulose dispersant solution with the mass percentage concentration of 0.02 percent: firstly, stirring and dispersing cyanoethyl cellulose serving as a dispersing agent with hot water, then adding cold water, continuously stirring, and cooling to obtain a dispersing agent solution;
(2) carrying out electron radiation treatment on the dispersing agent solution prepared in the step (1) by using electron rays, wherein the energy of the electron radiation treatment is 1MeV, the power is 20KW, and the electron radiation treatment time is 15min to obtain radiation modified dispersing liquid;
(3) pouring 0.5g of carbon fiber into a 500mL container, adding 400mL of water, and stirring with a glass rod to primarily disperse the carbon fiber in the water to obtain a first carbon fiber dispersion solution;
(4) adding 2g of the radiation modified dispersion liquid prepared in the step (2) into the first carbon fiber dispersion liquid prepared in the step (3), and mechanically stirring at the stirring speed of 600r/min for 20min to obtain a second carbon fiber dispersion liquid;
(5) and (4) dropwise adding 2-3 drops of defoaming agent GPE type polyoxyethylene ether with the mass percentage concentration of 0.03% -10% into the second carbon fiber dispersion liquid prepared in the step (4), mechanically stirring at the stirring speed of 1000r/min until no bubbles exist, and thus obtaining the carbon fiber dispersion liquid.
Example 2
(1) Preparing a hydroxypropyl methyl cellulose dispersing agent solution with the mass percentage concentration of 0.02 percent: firstly, stirring and dispersing cyanoethyl cellulose serving as a dispersing agent with hot water, then adding cold water, continuously stirring, and cooling to obtain a dispersing agent solution;
(2) carrying out electron radiation treatment on the dispersing agent solution prepared in the step (1) by using electron rays, wherein the energy of the electron radiation treatment is 1MeV, the power is 20KW, and the electron radiation treatment time is 15min to obtain radiation modified dispersing liquid;
(3) pouring 1g of carbon fibers into a 500mL container, adding 400mL of water, and stirring with a glass rod to primarily disperse the carbon fibers in the water to obtain a first carbon fiber dispersion liquid;
(4) adding 2g of the radiation modified dispersion liquid prepared in the step (2) into the first carbon fiber dispersion liquid prepared in the step (3), and mechanically stirring at the stirring speed of 600r/min for 20min to obtain a second carbon fiber dispersion liquid;
(5) and (4) dropwise adding 2-3 drops of defoaming agent GPE type polyoxypropylene ether with the mass percentage concentration of 0.03% -10% into the second carbon fiber dispersion liquid prepared in the step (4), mechanically stirring at the stirring speed of 1000r/min until no bubbles exist, and thus obtaining the carbon fiber dispersion liquid.
Example 3
(1) Preparing a carboxymethyl hydroxyethyl cellulose dispersant solution with the mass percentage concentration of 0.1 percent: firstly, stirring and dispersing cyanoethyl cellulose serving as a dispersing agent with hot water, then adding cold water, continuously stirring, and cooling to obtain a dispersing agent solution;
(2) carrying out electron radiation treatment on the dispersing agent solution prepared in the step (1) by using electron rays, wherein the energy of the electron radiation treatment is 1MeV, the power is 20KW, and the electron radiation treatment time is 15min to obtain radiation modified dispersing liquid;
(3) pouring 1g of carbon fibers into a 500mL container, adding 400mL of water, and stirring with a glass rod to primarily disperse the carbon fibers in the water to obtain a first carbon fiber dispersion solution;
(4) adding 2g of the radiation modified dispersion liquid prepared in the step (2) into the first carbon fiber dispersion liquid prepared in the step (3), and mechanically stirring at the stirring speed of 600r/min for 20min to obtain a second carbon fiber dispersion liquid;
(5) and (4) dropwise adding 2-3 drops of defoaming agent GPE type polyoxyethylene ether with the mass percentage concentration of 0.03% -10% into the second carbon fiber dispersion liquid prepared in the step (4), mechanically stirring at the stirring speed of 1000r/min until no bubbles exist, and thus obtaining the carbon fiber dispersion liquid.
Example 4
The same as example 1, except that the mass ratio of the carbon fibers to the dispersant was 1: 2.
Example 5
(1) Preparing cyanoethyl cellulose dispersant solution with the mass percentage concentration of 0.02 percent: firstly, stirring and dispersing cyanoethyl cellulose serving as a dispersing agent with hot water, then adding cold water, continuously stirring, and cooling to obtain a dispersing agent solution;
(2) performing electron radiation treatment on the dispersant solution prepared in the step (1) by using gamma rays, wherein the energy of the electron radiation treatment is 10MeV, the power is 10KW, and the electron radiation treatment time is 10min to obtain radiation modified dispersion liquid;
(3) pouring 0.5g of carbon fiber into a 500mL container, adding 400mL of water, and stirring with a glass rod to primarily disperse the carbon fiber in the water to obtain a first carbon fiber dispersion solution;
(4) adding 10g of the radiation modified dispersion liquid prepared in the step (2) into the first carbon fiber dispersion liquid prepared in the step (3), and mechanically stirring at the stirring speed of 600r/min for 20min to obtain a second carbon fiber dispersion liquid;
(5) and (4) dropwise adding 2-3 drops of defoaming agent GPE type polyoxyethylene ether with the mass percentage concentration of 0.03% -10% into the second carbon fiber dispersion liquid prepared in the step (4), mechanically stirring at the stirring speed of 1000r/min until no bubbles exist, and thus obtaining the carbon fiber dispersion liquid.
Example 6
(1) Preparing cyanoethyl cellulose dispersant solution with the mass percentage concentration of 0.02 percent: firstly, stirring and dispersing cyanoethyl cellulose serving as a dispersing agent with hot water, then adding cold water, continuously stirring, and cooling to obtain a dispersing agent solution;
(2) carrying out electron radiation treatment on the dispersing agent solution prepared in the step (1) by using electron rays, wherein the energy of the electron radiation treatment is 10MeV, the power is 15KW, and the electron radiation treatment time is 10min to obtain radiation modified dispersing liquid;
(3) pouring 0.5g of carbon fiber into a 500mL container, adding 400mL of water, and stirring with a glass rod to primarily disperse the carbon fiber in the water to obtain a first carbon fiber dispersion solution;
(4) adding 10g of the radiation modified dispersion liquid prepared in the step (2) into the first carbon fiber dispersion liquid prepared in the step (3), and mechanically stirring at the stirring speed of 600r/min for 20min to obtain a second carbon fiber dispersion liquid;
(5) and (4) dropwise adding 2-3 drops of defoaming agent GPE type polyoxyethylene ether with the mass percentage concentration of 0.03% -10% into the second carbon fiber dispersion liquid prepared in the step (4), mechanically stirring at the stirring speed of 1000r/min until no bubbles exist, and thus obtaining the carbon fiber dispersion liquid.
Example 7
(1) Preparing cyanoethyl cellulose dispersant solution with the mass percentage concentration of 0.02 percent: firstly, stirring and dispersing cyanoethyl cellulose serving as a dispersing agent with hot water, then adding cold water, continuously stirring, and cooling to obtain a dispersing agent solution;
(2) carrying out electron radiation treatment on the dispersing agent solution prepared in the step (1) by using electron rays, wherein the energy of the electron radiation treatment is 5MeV, the power is 10KW, and the electron radiation treatment time is 10min to obtain radiation modified dispersing liquid;
(3) pouring 0.5g of carbon fiber into a 500mL container, adding 400mL of water, and stirring with a glass rod to primarily disperse the carbon fiber in the water to obtain a first carbon fiber dispersion solution;
(4) adding 10g of the radiation modified dispersion liquid prepared in the step (2) into the first carbon fiber dispersion liquid prepared in the step (3), and mechanically stirring at the stirring speed of 600r/min for 20min to obtain a second carbon fiber dispersion liquid;
(5) and (4) dropwise adding 2-3 drops of defoaming agent GPE type polyoxyethylene ether with the mass percentage concentration of 0.03% -10% into the second carbon fiber dispersion liquid prepared in the step (4), mechanically stirring at the stirring speed of 1000r/min until no bubbles exist, and thus obtaining the carbon fiber dispersion liquid.
Comparative example 1
Basically the same as example 1, except that the dispersant was not treated with electron irradiation, specifically as follows:
(1) preparing cyanoethyl cellulose dispersant solution with the mass percentage concentration of 0.02 percent: firstly, stirring and dispersing cyanoethyl cellulose serving as a dispersing agent with hot water, then adding cold water, continuously stirring, and cooling to obtain a dispersing agent solution;
(2) pouring 0.5g of carbon fiber into a 500mL container, adding 400mL of water, and stirring with a glass rod to primarily disperse the carbon fiber in the water to obtain a first carbon fiber dispersion solution;
(3) adding 2g of the dispersant solution prepared in the step (1) into the first carbon fiber dispersion liquid prepared in the step (2), and mechanically stirring at the stirring speed of 600r/min for 20min to obtain a second carbon fiber dispersion liquid;
(4) and (4) dropwise adding 2-3 drops of defoaming agent GPE type polyoxyethylene ether with the mass percentage concentration of 0.03% -10% into the second carbon fiber dispersion liquid prepared in the step (3), mechanically stirring at the stirring speed of 1000r/min until no bubbles exist, and thus obtaining the carbon fiber dispersion liquid.
Comparative example 2
Substantially the same as in example 1, except that sodium dodecylbenzenesulfonate which has not been subjected to electron irradiation treatment is used as the dispersant, and the specific preparation procedure is as in comparative example 1.
Comparative example 3
The method is basically the same as that of example 1, except that the dispersing agent is sodium dodecylbenzenesulfonate treated by electron irradiation; the step (1) is as follows:
(1) preparing a sodium dodecyl benzene sulfonate dispersant solution with the mass percentage concentration of 0.02 percent: the dispersant sodium dodecyl benzene sulfonate is firstly stirred and dispersed by hot water, then cold water is added for continuous stirring, and the dispersant solution is obtained after cooling.
Comparative example 4
The same as example 1, except that the dispersant was sodium hexadecyl sulfonate treated with electron irradiation; the step (1) is as follows:
(1) preparing a sodium hexadecylsulfonate dispersant solution with the mass percentage concentration of 0.02 percent: the dispersant sodium hexadecyl sulfonate is firstly stirred and dispersed by hot water, then cold water is added for continuous stirring, and the dispersant solution is obtained after cooling.
Comparative example 5
Substantially the same as in example 1, except that the dispersant was tween 80 treated with electron irradiation; the step (1) is as follows:
(1) preparing a Tween 80 dispersant solution with the mass percent concentration of 0.02%: and (3) stirring and dispersing Tween 80 serving as a dispersant by using hot water, then adding cold water, continuously stirring, and cooling to obtain a dispersant solution.
The process parameters and the types and mass ratios of the dispersants of the examples and comparative examples are shown in Table 1; wherein (M carbon: M min) is the mass ratio of the carbon fiber to the dispersant solution;
the dispersion degree of the carbon fiber dispersion liquid prepared in the examples and the comparative examples is characterized, the bottom sediment is separated after the dispersed carbon fiber dispersion liquid is soaked for 12 hours, and the sediment is cleaned, dried and weighed, so that the dispersion rate can be calculated; wherein the dispersion rate is (original carbon fiber mass-precipitation mass)/original carbon fiber mass × 100%. The results are shown in Table 1.
TABLE 1
As can be seen from Table 1, the CEC, HPMC, CMHFC after electron ray treatment showed a significant increase in the dispersion rate of carbon fibers in water as compared with comparative example 1 in examples 1-7. However, the low-molecular surfactants used in comparative examples 3 to 5 do not undergo structural change under electron irradiation, and adsorption on the surface of carbon fibers has a limited effect on water dispersibility.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, so as to understand the technical solutions of the present invention specifically and in detail, but not to be understood as the limitation of the protection scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. It should be understood that the technical solutions provided by the present invention, which are obtained by logical analysis, reasoning or limited experiments, are within the scope of the appended claims. Therefore, the protection scope of the patent of the invention is subject to the content of the appended claims, and the description can be used for explaining the content of the claims.
Claims (6)
1. A method for preparing a carbon fiber dispersion is characterized by comprising the following steps:
mixing a dispersant and water, and then carrying out radiation treatment to obtain a dispersant solution subjected to radiation treatment; the dispersing agent is selected from at least one of hydroxypropyl methyl cellulose, cyanoethyl cellulose and carboxymethyl hydroxyethyl cellulose; the energy of the radiation treatment is 0.5 MeV-10 MeV, the power is 10 KW-20 KW, and the time is 10 min-20 min; the radiation source of the radiation treatment is selected from electron rays or gamma rays; the mass percentage concentration of the dispersant solution is 0.005-5%;
mixing the dispersant solution and carbon fibers to obtain a carbon fiber dispersion liquid; the mass ratio of the carbon fibers to the dispersant solution is 1 (1-50).
2. The method for producing a carbon fiber dispersion according to claim 1, wherein a defoaming agent is further added in the step of mixing the dispersant solution and the carbon fibers, the defoaming agent being at least one selected from the group consisting of glycerol polyether, polyoxyethylene ether, polyoxypropylene ether and polypropylene glycol.
3. A carbon fiber dispersion liquid characterized by being produced by the method for producing a carbon fiber dispersion liquid according to any one of claims 1 to 2.
4. A carbon fiber paper characterized in that a raw material for producing the carbon fiber paper comprises the carbon fiber dispersion liquid according to claim 3.
5. A gas diffusion layer comprising the carbon fiber paper of claim 4.
6. A fuel cell, wherein an electrode of the fuel cell comprises the gas diffusion layer of claim 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111675754.3A CN114293401B (en) | 2021-12-31 | 2021-12-31 | Carbon fiber dispersion liquid, method for producing same, gas diffusion layer, and fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111675754.3A CN114293401B (en) | 2021-12-31 | 2021-12-31 | Carbon fiber dispersion liquid, method for producing same, gas diffusion layer, and fuel cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114293401A CN114293401A (en) | 2022-04-08 |
| CN114293401B true CN114293401B (en) | 2022-08-30 |
Family
ID=80974778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111675754.3A Active CN114293401B (en) | 2021-12-31 | 2021-12-31 | Carbon fiber dispersion liquid, method for producing same, gas diffusion layer, and fuel cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114293401B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002265668A (en) * | 2001-03-15 | 2002-09-18 | Mitsubishi Materials Corp | Functional dispersion |
| CN1835263A (en) * | 2005-03-18 | 2006-09-20 | 上海世龙科技有限公司 | Method of preparing fuel cell electrocatalyst |
| JP2010037669A (en) * | 2008-07-31 | 2010-02-18 | Toray Ind Inc | Method for producing carbon fiber base material |
| JP2011207631A (en) * | 2010-03-29 | 2011-10-20 | Cci Corp | Method for producing carbon nanotube dispersion |
| CN109306552A (en) * | 2017-07-28 | 2019-02-05 | 北京化工大学 | High-strength and high-modulus carbon fiber and preparation method thereof |
| CN112709093A (en) * | 2019-10-24 | 2021-04-27 | 中国石油化工股份有限公司 | Preparation method of carbon fiber paper |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010041750A1 (en) * | 2008-10-10 | 2010-04-15 | 保土谷化学工業株式会社 | Aqueous dispersion of carbon microfibers, process for producing the aqueous dispersion, and article produced using same |
-
2021
- 2021-12-31 CN CN202111675754.3A patent/CN114293401B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002265668A (en) * | 2001-03-15 | 2002-09-18 | Mitsubishi Materials Corp | Functional dispersion |
| CN1835263A (en) * | 2005-03-18 | 2006-09-20 | 上海世龙科技有限公司 | Method of preparing fuel cell electrocatalyst |
| JP2010037669A (en) * | 2008-07-31 | 2010-02-18 | Toray Ind Inc | Method for producing carbon fiber base material |
| JP2011207631A (en) * | 2010-03-29 | 2011-10-20 | Cci Corp | Method for producing carbon nanotube dispersion |
| CN109306552A (en) * | 2017-07-28 | 2019-02-05 | 北京化工大学 | High-strength and high-modulus carbon fiber and preparation method thereof |
| CN112709093A (en) * | 2019-10-24 | 2021-04-27 | 中国石油化工股份有限公司 | Preparation method of carbon fiber paper |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114293401A (en) | 2022-04-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Yang et al. | Novel composite membranes of triazole modified graphene oxide and polybenzimidazole for high temperature polymer electrolyte membrane fuel cell applications | |
| EP1944819B1 (en) | Method for producing membrane electrode assembly for solid polymer fuel cell | |
| CN101071873B (en) | Polymer ultrashort fiber reinforced fuel cell proton exchange membrane and preparation method thereof | |
| CN109428035B (en) | Battery diaphragm, preparation method thereof and lithium ion battery | |
| CN103304979A (en) | Phosphorylation titanium dioxide hollow sphere-filled sulfonated polyether ether ketone film as well as preparation and application | |
| CN115850968B (en) | MXene-based high-heat-conductivity fireproof composite film and preparation method and application thereof | |
| CN113506904B (en) | A kind of proton exchange membrane and its preparation method and application | |
| CN1986961A (en) | Preparation of carbon nano tube/acrylic carbon fiber composite carbon fiber paper and use | |
| Ou et al. | Highly mechanical nanostructured aramid-composites with gradient structures | |
| Zeng et al. | Self‐enhancement of perfluorinated sulfonic acid proton exchange membrane with its own nanofibers | |
| Daud et al. | Improvement of microbial fuel cell performance using novel kaolin earthenware membrane coated with a polybenzimidazole layer | |
| Terbish et al. | Improved performance of organic–inorganic nanocomposite membrane for bioelectricity generation and wastewater treatment in microbial fuel cells | |
| CN114293401B (en) | Carbon fiber dispersion liquid, method for producing same, gas diffusion layer, and fuel cell | |
| JP2021141072A (en) | Gas diffusion layer for solid polymer fuel cell, gas diffusion electrode, and manufacturing method thereof | |
| Mat et al. | Chitosan-poly (vinyl alcohol) and calcium oxide composite membrane for direct methanol fuel cell applications | |
| CN118610483A (en) | A high performance carbon paper and preparation method thereof | |
| He et al. | Sulfonated poly (ether ether ketone) composite membranes based on amino‐modified halloysite nanotubes that effectively immobilize phosphotungstic acid | |
| CN117403276A (en) | Preparation method of alkaline water electrolysis composite diaphragm and alkaline water electrolysis composite diaphragm | |
| CN111100328A (en) | Modified inorganic nano particle, polymer mixed slurry, composite membrane and preparation method | |
| CN116505046A (en) | A kind of ionic liquid/sodium lignosulfonate modified polyimide proton exchange composite membrane and its preparation method and application | |
| CN115359948A (en) | Fuel cell gas diffusion layer conductive slurry, gas diffusion layer and preparation method thereof | |
| Meng et al. | Polydopamine modified carbon fiber to improve the comprehensive properties of carbon paper for proton exchange membrane fuel cell | |
| Rahmatulloh et al. | The influence of polyvinyl alcohol concentration toward conductivity and permeability of chitosan–montmorillonite composite membrane | |
| CN115181305A (en) | Modified polyimide proton exchange membrane and preparation method thereof | |
| CN115117380A (en) | Porous bipolar plate and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |