CN211416521U - Active carbon fiber felt - Google Patents
Active carbon fiber felt Download PDFInfo
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- CN211416521U CN211416521U CN201921238991.1U CN201921238991U CN211416521U CN 211416521 U CN211416521 U CN 211416521U CN 201921238991 U CN201921238991 U CN 201921238991U CN 211416521 U CN211416521 U CN 211416521U
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Abstract
The utility model provides an active carbon fiber felt, which comprises at least two layers of net tires, wherein the net tires are alternately laminated, and needling is performed between the net tires alternately laminated to connect and fix needling fibers of adjacent laminated layers; the surface aperture of the activated carbon fiber felt is not higher than 0.7 nm. The utility model discloses an active carbon fiber felt surface has the porous structure of specific aperture yardstick, can reach effective absorption hydrogen effect.
Description
Technical Field
The utility model relates to a store up hydrogen and use carbonaceous material field, concretely relates to active carbon fiber felt.
Background
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information constitutes prior art that is already known to a person skilled in the art.
Solid material hydrogen storage is widely favored by researchers due to the characteristics of high safety, low energy consumption and the like. The solid hydrogen storage materials researched and developed at present mainly comprise metal alloy materials, carbonaceous materials, inorganic porous materials, composite chemical hydrogen compound materials, metal organic framework compound materials and the like. The elastic finger material has the advantages of large hydrogen absorption amount, light weight, strong anti-poisoning performance, easy desorption and the like, and the physical adsorption hydrogen storage is considered to be a hydrogen storage mode with great application prospect. Among the more promising hydrogen storage carbonaceous adsorbent materials are activated carbon fiber felt, carbon nanofibers, and carbon nanotubes.
The inventors have found that carbon nanofiber hydrogen storage, despite large hydrogen storage volumes, is costly in hydrogen storage media, slow in desorption rates, short in cycle life, and unsuitable for large-scale storage and transportation. The research on carbon nanotube hydrogen storage is popular, but the results obtained by various researchers are quite different, researchers in the national renewable energy laboratory in the united states begin to research carbon nanotube hydrogen storage earlier, Chambers and the like find that the hydrogen storage amounts of graphite nanofibers with herringbone shapes and plate shapes at the room temperature of 120MPa reach 67% and 53%, respectively, but Gary G and the like measure the hydrogen storage performances of 9 different carbon nanotube materials at the room temperature of-80 to 500 ℃ under 11MPa, and indicate that any report about that the carbon nanotube materials store more than 1% of hydrogen at the room temperature is unreliable. In order to confirm the best hydrogen storage capacity of the carbon nano tube, a series of experiments are carried out on the whole theory, and the result shows that the maximum hydrogen storage capacity of the carbon nano tube at normal temperature is not more than 0.5 percent, so that the hydrogen storage application prospect of the carbon nano tube is not very optimistic.
Disclosure of Invention
The inventor finds that the activated carbon fiber felt is a good carbon adsorbent all the time, and particularly the activated adsorption performance of the modified activated carbon fiber felt is greatly improved. Especially for the adsorption and hydrogen storage of the activated carbon fiber felt material with controllable surface pore structure characteristics, the method has the advantages of economy, high hydrogen storage amount, fast desorption, long cycle service life, easy realization of large-scale production and the like. Based on this, the utility model provides an activated carbon fiber felt that is used for hydrogen energy to absorb and save.
The utility model provides an active carbon fiber felt has the porous structure of specific pore size for the surface, can reach the effect of effective absorption hydrogen, the utility model discloses an active carbon fiber felt's surface aperture control is at 0.7nm not, perhaps is not higher than 0.65nm, perhaps is not higher than 0.6nm, perhaps controls at 0.6-0.7nm within range, and final active carbon fiber felt's hydrogen absorption rate is at 2.5% within range, the utility model discloses an active carbon fiber felt also can realize the storage to the hydrogen that adsorbs.
Specifically, the technical scheme of the utility model is as follows:
the utility model provides an active carbon fiber felt, which comprises at least two layers of net tires which are alternately laminated, and needling fibers which penetrate through the net tires between the alternate laminated layers to connect and fix the adjacent laminated layers; the pore diameter of the surface of the monofilament fiber of the activated carbon fiber felt is not higher than 0.7nm, or not higher than 0.65nm, or not higher than 0.6nm, or 0.6-0.7 nm.
The net tyre of the utility model takes the pre-oxidized fiber as the raw material, and is the pre-oxidized fiber net tyre.
In some embodiments of the present invention, the pre-oxidized fiber is a single type pre-oxidized fiber or a composite fiber, and the single type pre-oxidized fiber is a polyacrylonitrile pre-oxidized fiber and/or a viscose-based pre-oxidized fiber (i.e., viscose-based carbon fiber).
In some embodiments of the present invention, the single-layer net tire of the present invention has a grammage of 10-50g/m2。
In an embodiment of the present invention, the needled fibers are needled through the laminated web in a direction perpendicular to the lamination plane (i.e., in the Z-axis direction).
In some embodiments of the present invention, the pre-oxidized fiber has a tensile strength of 200MPa or more, a tensile modulus of 1.0GPa or more, and a fiber bulk density of 1.3g/cm3Above, the carbon content of the fiber is not less than 65 wt%.
The present invention is not limited to the method for preparing the activated carbon fiber mat, and the present invention provides some preparation methods as follows in the embodiments by way of example:
a method for preparing activated carbon fiber felt comprises taking pre-oxidized fiber as raw material, carding the pre-oxidized fiber into web tire by adopting a carding process; the net tire is laminated through a lamination process, the lamination is carried out by needling the needling fiber to obtain a carbon fiber felt (or also called a pre-oxidized fiber felt), and the carbon fiber felt is carbonized, activated and cooled to obtain the activated carbon fiber felt.
In some embodiments, pre-oxidized fibers are first used as a raw material, and a web-forming process is used to comb the web-formed batt; then, the net tire is laminated by adopting a hybrid lamination process and needled into a felt, and the needling density in the thickness direction and the needling fiber hybrid proportion are controlled in the needling process; finally, the flow and the temperature of the activating medium in the activating process are controlled through an activating process so as to achieve the purpose of controlling the pore diameter of the monofilament fiber surface of the activated carbon fiber felt, and the activated carbon fiber felt material with controllable surface pore structure characteristics is prepared.
In some embodiments, the pre-oxidized fiber material may be polyacrylonitrile pre-oxidized fiber and/or viscose-based pre-oxidized fiber, the pre-oxidized fiber has a tensile strength of not less than 200MPa, such as 250-300MPa, a tensile modulus of not less than 1.0GPa, such as 1.2-2.0GPa, and a fiber bulk density of not less than 1.3g/cm3For example, 1.3 to 1.5g/cm3The carbon content of the fiber is not lowAt 65 wt.%, for example 55 to 75 wt.%. These fibers are all commercially available.
In some embodiments, in the carding process, the pre-oxidized fibers are used as raw materials for carding, and the carding ensures that the gram weight of the single-layer net tire is 10-50g/m2In the range of further 10 to 45g/m2E.g. 10g/m2、40g/m2Or 45g/m2. When different types of fiber hybrid carded webs are adopted, the carded web mixing proportion can be flexibly adjusted according to requirements, for example, when different pre-oxidized fiber hybrid carded webs are used, for example, polyacrylonitrile pre-oxidized fibers and viscose-based pre-oxidized fibers are mixed, the mixing proportion (mass ratio) can be flexibly adjusted, for example, the mixing proportion is 1: 1-99 or 1-99: 1, e.g. 1: 1. 1: 5 or 4: 1.
in some embodiments, the hybrid lay-up of the webs may be blended with webs of different grammage to adjust the density gradient of the fibers within the different layers. The lamination needling is performed in the direction perpendicular to the lamination surface (i.e. along the Z-axis direction), and the needling density is controlled to be 10-40 needles/cm2Within the scope, the needle punched fiber is selected from pre-oxidized fiber, the needle punched fiber can be single pre-oxidized fiber or the mixture of different pre-oxidized fibers, and the mixture ratio can be flexibly adjusted. For example, the needle-punched fibers may be a mixture of polyacrylonitrile pre-oxidized fibers and viscose-based pre-oxidized fibers, and the mixing ratio (mass ratio) of the polyacrylonitrile pre-oxidized fibers and the viscose-based pre-oxidized fibers may be 1 to 99: 1 or 1: 1-99, in the technical scheme of the utility model, the proportion is 1-10: 1, in particular 3 to 8: the technical objects of the present invention are more easily achieved at 1 hour, such as 3: 1. 4:1 or 8: 1.
in some embodiments, the carbonization and activation process is performed by simultaneous carbonization and activation, and the pre-oxidized fiber mat (i.e., carbon fiber mat with a density of 0.05-0.09 g/m) prepared as described above is subjected to carbonization at room temperature3Then feeding the mixture into a hearth of an activation furnace, introducing nitrogen into the hearth, carrying out carbonization heating at different heating rates, introducing steam after reaching a certain temperature, activating at constant temperature for a certain time after reaching a preset temperature, cooling to a certain temperature under the protection of nitrogen, and then coolingAnd then cooling to room temperature to complete the activation and carbonization treatment of the carbon fiber felt.
In some embodiments, the needling is performed in a direction perpendicular to the lamination plane (i.e., in the Z-axis direction).
In some embodiments, the needling density is between 10 and 50 needles/cm2。
In certain embodiments of the present invention, the carbonization treatment comprises heating to 1000-.
In some embodiments, the carbonization is performed in a nitrogen atmosphere.
In some embodiments, carbonization is increased to 1000-1500 ℃ at a temperature increase rate of 5-15 ℃/min.
In some embodiments, the carbonization temperature is increased to 1000-1500 ℃, and then the steam is introduced, wherein the introduction rate of the steam is 3-15 g/min.
In some embodiments, the carbonization time is 20 to 50 min.
In some embodiments, cooling to 150-; then naturally cooling to room temperature.
In some embodiments, the nitrogen is high-purity nitrogen with a purity of 99.99999% or more and an inlet pressure of not less than 0.2 MPa.
In some embodiments, the activation carbonization of the present invention can be realized by a carbonization activation heating device, which comprises a heat preservation furnace chamber, a heater and a temperature control device, wherein high purity nitrogen is introduced into the whole heat preservation furnace chamber through a flow inlet, and the gas flow is controlled by a flow controller; meanwhile, activating steam is introduced through a flow inlet, and the flow rate of the activating steam is controlled by a flow controller. Therefore, the process for preparing the activated carbon fiber felt of the utility model based on the device is particularly easy to realize the process. An example of such a device is the device shown in fig. 2.
Thus, in some embodiments, the carbonization activation treatment is based on the above carbonization activation heating apparatus, which comprises: sending the prepared pre-oxidized fiber felt (namely the carbon fiber felt) into a heat preservation hearth 1 at room temperature, then introducing nitrogen into the hearth through a flow inlet 4, controlling the introduction pressure of the nitrogen to be not lower than 0.2MPa through a flow controller 5, controlling a heater 2 to heat to 1000-plus-one temperature at the heating rate of 5-15 ℃/min through a temperature control device 3, then introducing activating steam through a flow inlet 6, controlling the flow of the steam to be 3-15g/min through a flow controller 7, carbonizing at the temperature of 1000-plus-one temperature of 1500 ℃ for 20-50min, and then continuously cooling to 150-plus-one temperature of 200 ℃ in a nitrogen atmosphere; and then naturally cooling to room temperature to complete the activation and carbonization treatment of the carbon fiber felt.
The utility model provides an above-mentioned activated carbon fiber felt is applied to hydrogen energy storage and/or absorption field. The surface aperture of the activated carbon fiber felt is not higher than 0.7nm, or not higher than 0.65nm, or not higher than 0.6nm, or 0.6-0.7nm, and the hydrogen absorption rate is within the range of 2.5%.
The utility model discloses an active carbon fiber felt has the controllable characteristic of surface pore structure, and its surface aperture is not higher than 0.7nm, or is not higher than 0.65nm, or is not higher than 0.6nm, or is 0.6-0.7nm, has higher adsorption activity, especially can be used for hydrogen absorption and hydrogen storage, has economy, stores up hydrogen high, the desorption is fast, long service life and realize advantages such as scale production easily.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. Embodiments of the present invention are described in detail below with reference to the attached drawing figures, wherein:
fig. 1 is a schematic diagram of a felt structure of an activated carbon fiber felt according to the present invention; wherein 1, 2 and 3 are respectively of a net tire structure, and 4 is of a needle-punched fiber; the activated carbon fiber felt is obtained by laminating a web 1, a web 2 and a web 3 and then needling the laminated layers with different densities of the needled fibers 4 in the Z-axis direction (i.e., the direction perpendicular to the laminated layer).
FIG. 2 is a schematic diagram of a carbonization activation heating device for activated carbon fiber felt, which comprises a heat preservation hearth 1, a heater 2 and a temperature control device 3, wherein high-purity nitrogen is introduced into the whole heat preservation hearth 1 through a flow inlet 4, and the nitrogen flow is controlled by a flow controller 5; meanwhile, the activating steam is introduced through a flow inlet 6, and the flow of the steam is controlled by a flow controller 7.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out according to conventional conditions or according to conditions recommended by the manufacturers.
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. The reagent or raw material used by the utility model can be purchased and obtained through a conventional way, if no special description is provided, the reagent or raw material used by the utility model can be used according to the conventional way in the field or the product specification. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention. The preferred embodiments and materials described herein are intended to be exemplary only.
The polyacrylonitrile pre-oxidized fiber, the viscose pre-oxidized fiber (i.e., viscose carbon fiber) and the corresponding fiber felt used in the following examples are conventional commercially available varieties, specifications are optional, and the needle-punched fiber may be a single pre-oxidized fiber or a composite fiber in the manner illustrated in this example. The following embodiments can be implemented using the apparatus shown in fig. 2 or with other apparatus including a holding furnace, a heater, a temperature control device, a flow control device.
Example 1
The tensile strength is 280MPa, the tensile modulus is 1.6GPa, and the bulk density is 1.3g/cm3Polyacrylonitrile preoxidized fiber with 55% carbon content, which is obtained by using the fiber according to 40g/m of single-layer net tire2Carding the net, laminating the net blank by 10mm thickness after combing the net, carrying out Z-axis needling processing, selecting polyacrylonitrile preoxidized fiber and viscose fiber-based preoxidized fiber with the mixture ratio of 4:1 for needling, wherein the needling density is 10/cm2The final pre-oxidized fiber felt has a bulk density of 0.05g/m3Putting the fibers into an activation furnace, introducing high-purity nitrogen with the pressure not lower than 0.2MPa and the purity of more than 99.99999%, and synchronously carbonizing and activating the fibers, firstly setting the carbonization temperature at 1000 ℃, raising the temperature at the rate of 5 ℃/min, then introducing water vapor with the rate of 3g/min when the carbonization temperature is reached, after 20min of activation treatment, reducing the temperature to 150 ℃ under the protection of nitrogen, then naturally cooling to room temperature, and finally controlling the surface aperture of the monofilament fibers of the carbon fiber felt within the range of 0.6nm and the hydrogen absorption rate of the monofilament fibers within the range of 2.5%.
Example 2
The tensile strength is 250MPa, the tensile modulus is 1.5GPa, and the bulk density is 1.35g/cm3Viscose-based pre-oxidized fiber with 75% of carbon content, wherein the fiber is arranged according to a single-layer net tyre of 10g/m2Carding the net, laminating the net blank by 20mm thickness, performing Z-axis needling, selecting polyacrylonitrile preoxidized fiber and viscose fiber-based preoxidized fiber with a mixture ratio of 3:1, and needling according to a needling density of 10 needles/cm2The final pre-oxidized fiber felt has a bulk density of 0.07g/m3Putting the fibers into an activation furnace, introducing high-purity nitrogen with the pressure not lower than 0.3MPa and the purity of more than 99.9999%, and synchronously carbonizing and activating the fibers, firstly setting the carbonization temperature at 1500 ℃, raising the temperature at 15 ℃/min, then introducing water vapor with the speed of 15g/min when the carbonization temperature is reached, after 26min of activation treatment, reducing the temperature to 150 ℃ under the protection of nitrogen, and then naturally cooling to room temperature, wherein the surface aperture of the monofilament fiber of the finally obtained carbon fiber felt is controlled within the range of 0.6nm, and the hydrogen absorption rate of the monofilament fiber is within the range of 2.5%.
Example 3
The tensile strength is 300MPa, the tensile modulus is 2.0GPa, and the bulk density is 1.5g/cm3Viscose base preoxidized fiber with carbon content of 60 percent, and the fiber is processed according to 40g/m of single-layer net tire2Combing the net, laminating the net blank with the thickness of 8mm after combing the net, carrying out Z-axis needling processing, and selecting polyacrylonitrile preoxidized fiber and viscose fiber-based preoxidized fiber with the mixing ratio of 8:1 for carrying out Z-axis needling processingNeedling with a needling density of 50 needles/cm2The final pre-oxidized fiber felt has a bulk density of 0.09g/m3The fiber is put into an activation hearth, high-purity nitrogen with the pressure not lower than 0.4MPa and the purity more than 99.99999 percent is introduced, carbonization and activation treatment are synchronously carried out, firstly, the carbonization temperature is set at 1400 ℃, the heating rate is 12 ℃/min, then when the carbonization temperature is reached, water vapor with the rate of 12g/min is introduced, after 30min of activation treatment, the temperature is reduced to 110 ℃ under the protection of nitrogen, then the temperature is naturally cooled to room temperature, the surface aperture of the monofilament fiber of the finally obtained carbon fiber felt is controlled within the range of 0.65nm, and the hydrogen absorption rate is within the range of 2.5 percent.
Example 4
The tensile strength is 300MPa, the tensile modulus is 1.2GPa, and the bulk density is 1.37g/cm3And polyacrylonitrile preoxidized fiber with carbon content of 66%, wherein the fiber is woven into a single-layer net according to 45g/m2Carding the net, laminating the net blank with the thickness of 15mm after the net is carded, carrying out Z-axis needling processing, selecting polyacrylonitrile preoxidized fiber and viscose fiber-based preoxidized fiber with the mixture ratio of 4:1 for needling, wherein the needling density is 30 needles/cm2The final pre-oxidized fiber felt has a bulk density of 0.08g/m3Putting the fibers into an activation furnace, introducing high-purity nitrogen with the purity of more than 99.99999 percent and the pressure of not less than 0.5MPa, synchronously carbonizing and activating, firstly setting the carbonization temperature at 1500 ℃, raising the temperature at the rate of 8 ℃/min, then introducing water vapor with the rate of 10g/min when the carbonization temperature is reached, after 33min of activation treatment, reducing the temperature to 190 ℃ under the protection of nitrogen, then naturally cooling to room temperature, and finally controlling the surface aperture of the monofilament fiber of the carbon fiber felt within the range of 0.7nm and the hydrogen absorption rate of the monofilament fiber within the range of 2.5 percent.
Example 5
The tensile strength is 280MPa, the tensile modulus is 1.6GPa, and the bulk density is 1.3g/cm3Polyacrylonitrile preoxidized fiber with 55% carbon content, which is obtained by using the fiber according to 40g/m of single-layer net tire2Combing the net, laminating the net blank with the thickness of 10mm after combing the net, carrying out Z-axis needling processing, and selecting polyacrylonitrile preoxidized fiberNeedling is carried out, wherein the needling density is 10/cm2The final pre-oxidized fiber felt has a bulk density of 0.05g/m3Putting the fibers into an activation furnace, introducing high-purity nitrogen with the pressure not lower than 0.2MPa and the purity of more than 99.99999%, and synchronously carbonizing and activating the fibers, firstly setting the carbonization temperature at 1000 ℃, raising the temperature at the rate of 5 ℃/min, then introducing water vapor with the rate of 3g/min when the carbonization temperature is reached, after 20min of activation treatment, reducing the temperature to 150 ℃ under the protection of nitrogen, then naturally cooling to room temperature, and finally controlling the surface aperture of the monofilament fibers of the carbon fiber felt within the range of 0.6nm and the hydrogen absorption rate of the monofilament fibers within the range of 2.5%.
Example 6
The tensile strength is 250MPa, the tensile modulus is 1.5GPa, and the bulk density is 1.35g/cm3Viscose-based pre-oxidized fiber with 75% of carbon content, wherein the fiber is arranged according to a single-layer net tyre of 10g/m2Combing the net, laminating the net blank by 20mm thickness after combing the net, carrying out Z-axis needling processing, selecting viscose fiber-based preoxidized fiber for needling, wherein the needling density is 10 needles/cm2The final pre-oxidized fiber felt has a bulk density of 0.07g/m3Putting the fibers into an activation furnace, introducing high-purity nitrogen with the pressure not lower than 0.3MPa and the purity of more than 99.9999%, and synchronously carbonizing and activating the fibers, firstly setting the carbonization temperature at 1500 ℃, raising the temperature at 15 ℃/min, then introducing water vapor with the speed of 15g/min when the carbonization temperature is reached, after 26min of activation treatment, reducing the temperature to 150 ℃ under the protection of nitrogen, and then naturally cooling to room temperature, wherein the surface aperture of the monofilament fiber of the finally obtained carbon fiber felt is controlled within the range of 0.6nm, and the hydrogen absorption rate of the monofilament fiber is within the range of 2.5%.
Example 7
The tensile strength is 300MPa, the tensile modulus is 1.2GPa, and the bulk density is 1.37g/cm3And polyacrylonitrile preoxidized fiber with carbon content of 66%, wherein the fiber is woven into a single-layer net according to 45g/m2Combing the net, laminating the net blank with the thickness of 15mm after combing the net, carrying out Z-axis needling processing, and selecting polyacrylonitrile preoxidized fiber and viscose fiber-based preoxidized fiber with the mixture ratio of 4:1 for carrying out Z-axis needling processingNeedling with needling density of 30 needles/cm2The final pre-oxidized fiber felt has a bulk density of 0.08g/m3Putting the fibers into an activation furnace, introducing high-purity nitrogen with the purity of more than 99.99999 percent and the pressure of not less than 0.5MPa, synchronously carbonizing and activating, firstly setting the carbonization temperature at 1500 ℃, raising the temperature at the rate of 8 ℃/min, then introducing water vapor with the rate of 10g/min when the carbonization temperature is reached, after 33min of activation treatment, reducing the temperature to 190 ℃ under the protection of nitrogen, then naturally cooling to room temperature, and finally controlling the surface aperture of the monofilament fiber of the carbon fiber felt within the range of 0.7nm and the hydrogen absorption rate of the monofilament fiber within the range of 2.5 percent.
Example 8
The tensile strength is 300MPa, the tensile modulus is 2.0GPa, and the bulk density is 1.5g/cm3Viscose base preoxidized fiber with carbon content of 60 percent, and the fiber is processed according to 40g/m of single-layer net tire2Combing the net, laminating the net blank with the thickness of 8mm after combing the net, carrying out Z-axis needling processing, selecting polyacrylonitrile preoxidized fiber with the mixing ratio of 8:1 for needling, and needling the fabric according to the needling density of 50 needles/cm2The final pre-oxidized fiber felt has a bulk density of 0.09g/m3The fiber is put into an activation hearth, high-purity nitrogen with the pressure not lower than 0.4MPa and the purity more than 99.99999 percent is introduced, carbonization and activation treatment are synchronously carried out, firstly, the carbonization temperature is set at 1400 ℃, the heating rate is 12 ℃/min, then when the carbonization temperature is reached, water vapor with the rate of 12g/min is introduced, after 30min of activation treatment, the temperature is reduced to 110 ℃ under the protection of nitrogen, then the temperature is naturally cooled to room temperature, the surface aperture of the monofilament fiber of the finally obtained carbon fiber felt is controlled within the range of 0.65nm, and the hydrogen absorption rate is within the range of 2.5 percent.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The activated carbon fiber felt is characterized by comprising at least two layers of net tires, wherein the net tires are alternately laminated; and the combination of (a) and (b),
needling fibers, wherein the needled fibers are needled and penetrated between the alternate laminated layers of the net tire to connect and fix the adjacent laminated layers;
the needle-punched fibers are needle-punched through the laminated web in a direction perpendicular to the lamination plane.
2. The activated carbon fiber mat according to claim 1, wherein the surface pore size of the activated carbon fiber mat is not higher than 0.7nm, or not higher than 0.65nm, or not higher than 0.6 nm.
3. The activated carbon fiber mat according to claim 2, wherein the surface pore size of the activated carbon fiber mat is 0.6 to 0.7 nm.
4. The activated carbon fiber mat of claim 1, wherein the web is a web of pre-oxidized fibers.
5. The activated carbon fiber mat according to claim 4, wherein the pre-oxidized fibers are single type pre-oxidized fibers or composite fibers, and the single type pre-oxidized fibers are polyacrylonitrile pre-oxidized fibers or viscose-based pre-oxidized fibers.
6. The activated carbon fiber mat according to claim 1, wherein the grammage of a single layer of the web is 10-50g/m2。
7. The activated carbon fiber mat according to claim 1, wherein the needling density of the needled fibers is 10-40 needles/cm2。
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| GR01 | Patent grant | ||
| GR01 | Patent grant |