Melt-blown carbon cloth and preparation method and application thereof

Abstract

The invention provides melt-blown carbon cloth as well as a preparation method and application thereof, and belongs to the field of non-weaving. The method comprises the following steps: blowing activated carbon particles to a melt-blown fiber expansion area; meanwhile, adding activated carbon powder with ultra-fine particle size into the polyvinyl butyral solution according to a certain proportion to obtain a spinning solution, and spinning the spinning solution into a non-woven fabric with a spiral grid structure by adopting a plane receiving type centrifugal spinning process; a polyvinyl butyral-activated carbon fiber net is conveyed and embedded into stretched polymer fibers through a net conveying curtain, and the polymer-activated carbon fiber net and the polyvinyl butyral-activated carbon fiber net are mutually interspersed, compounded and bonded on a collecting plate by utilizing the bonding of a polymer; and forming the melt-blown carbon cloth with activated carbon loaded inside and on the surface of the fiber. Compared with the existing melt-blown composite carbon-sandwiched cloth, the activated carbon particles are adhered to the interior of the fiber, pores among fiber entanglement and the surface of the fiber, the carbon content is higher and more durable, and the filtering performance and the adsorption performance are both improved.

Description

Technical Field

[0001] The present invention relates to the technical field of nonwovens, and in particular to a melt-blown carbon cloth, a preparation method thereof, and an application thereof. Background Art

[0002] Melt blowing is the most commonly used and mature process for producing nanofibers. The principle is to extrude a polymer melt from the spinneret holes of a die to form a melt stream, and the melt stream is extremely stretched by a high-speed and high-temperature air stream to form extremely fine short fibers, thereby forming ultrafine fibers and collecting them on a coagulation net curtain or a drum, and self-bonding and reinforcement (interpenetration and entanglement between fibers) are carried out to form a melt-blown filter material.

[0003] Activated carbon is a carbon material with a developed pore structure, a large specific surface area, and a strong selective adsorption ability. Under certain conditions, it adsorbs, removes, purifies, refines, or recovers one or some substances in a liquid or gas to achieve product refinement and environmental purification. Activated carbon is an adsorption material mainly composed of carbon, with a complex structure. It neither has a molecular structure with carbon atoms arranged regularly like graphene or diamond, nor has a complex macromolecular structure like general carbides. Generally, activated carbon is considered to be composed of carbon microcrystals similar to graphite and amorphous carbon connected to build the block and pore structure of activated carbon. The pores of activated carbon are divided into macropores (pore diameter greater than 50 nm), mesopores (transition pores, pore diameter 2 - 50 nm), and micropores (pore diameter less than 2 nm). Most of the adsorption of activated carbon is carried out through micropores, so micropores determine the adsorption capacity of activated carbon. In order to greatly improve the adsorption performance of activated carbon, activated carbon modification technology and reactivation technology are adopted to increase the micropore porosity.

[0004] The combination of melt-blown materials and activated carbon is most commonly prepared into a carbon cloth by a composite method, that is, a framework - activated carbon - melt-blown filter material - non-woven fabric protective layer or a framework - activated carbon - melt-blown filter material. Such a production method can, to a certain extent, combine the functions of both the melt-blown filter material and activated carbon to meet the filtration requirements in different fields. However, through use, it is found that although the carbon cloth has more excellent functionality and adsorption than a single filter material, the activated carbon is fixed on the framework through a carbon sprinkling and spraying process and then compounded with the melt-blown filter material using glue. This process requires at least two production lines. On the one hand, the production cost is high. On the other hand, the activated carbon fixed with glue has a carbon leakage problem, resulting in a greatly reduced carbon coating rate, poor adsorption performance, and the carbon leakage problem still exists when compounding with the melt-blown filter material. In order to meet specific requirements, more carbon powder needs to be sprinkled to meet the demand, but it is also necessary to avoid blocking of fiber pores due to excessive activated carbon content.

[0005] In view of this, it is necessary to design a new melt-blown carbon cloth to solve the existing problems and better meet the filtration requirements in different fields. Summary of the Invention

[0006] Aiming at the problems in the prior art that when the content of activated carbon is too low, the adsorption performance is poor, and when the content of activated carbon increases, it is easy to cause blockage of fiber pores and poor filtration performance, the present invention provides a melt-blown carbon cloth, a preparation method thereof and an application thereof.

[0007] The purpose of the present invention is to provide a melt-blown carbon cloth that is green and environmentally friendly and has good filtration performance and adsorption performance.

[0008] To achieve the above purpose, the present invention provides a preparation method of a melt-blown carbon cloth, which includes the following steps:

[0009] S1, melting the polymer spinning raw material in a screw extruder and spraying it out from the spinneret holes for melt spinning to obtain primary filaments in the puffing area;

[0010] S2, using air flow to blow activated carbon particles to the primary filaments in the melt-blown puffing area. In this area, the activated carbon adheres to the inside and outside of the primary filaments, and then further stretching is carried out in the stretching area to obtain a polymer-activated carbon fiber web that has not been bonded and shaped;

[0011] S3, mixing and dissolving polyvinyl butyral powder and activated carbon powder to obtain a polyvinyl butyral-activated carbon spinning solution, and then spinning by a planar receiving centrifugal spinning process to obtain a polyvinyl butyral-activated carbon fiber web with a spiral grid structure;

[0012] S4, transporting and embedding the polyvinyl butyral-activated carbon fiber web obtained in step S3 onto the polymer-activated carbon fiber web stretched in step S2 through a wire mesh conveyor curtain. Utilizing the self-bonding of the polymer, the polymer-activated carbon fiber web and the polyvinyl butyral-activated carbon fiber web are interpenetrated, compounded and bonded on the collecting plate to form a melt-blown carbon cloth with activated carbon loaded on both the inside and surface of the fiber.

[0013] Further, in step S2, the activated carbon particles are provided by an activated carbon spreading device at the front end of the air flow generator of the melt-blown spinning equipment, and reach the air flow blowing port through a conveying channel; the air pressure of the air flow is 0.3±0.05mp, the rotation speed of the activated carbon spreading device is 10±1Hz, and the blowing amount of the activated carbon particles is 20 - 40mg / s.

[0014] Further, in step S3, the polyvinyl butyral powder is dissolved in a solvent to obtain a polyvinyl butyral solution with a mass fraction of 12 - 14%; the mass ratio of the activated carbon powder is 40 - 60% of the sum of the masses of the polyvinyl butyral powder and the activated carbon powder.

[0015] Further, in step S3, the gram weight of the polyvinyl butyral-activated carbon fiber web is (15 - 20) g / m2 。

[0016] Further, in step S3, in the planar receiving centrifugal spinning process, the spinning speed is 4500 - 5500 rpm, the aperture of the spinning needle is 0.21 - 0.41 mm, and the collection height is 6 - 8 cm.

[0017] The present invention also provides a melt - blown carbon cloth prepared by the aforementioned preparation method. The melt - blown carbon cloth includes polymer fibers, a polyvinyl butyral - activated carbon fiber network, and activated carbon loaded inside and on the surface of the fibers; the loading amount of the activated carbon is 20 - 50% of the total mass of the melt - blown carbon cloth.

[0018] Further, the polymer fibers are one or a combination of polypropylene fibers, polyester fibers, or polyethylene fibers; the activated carbon particles are one or a combination of coconut shell charcoal and coal - based charcoal; the particle size of the activated carbon particles is 80 - 150 mesh.

[0019] Further, the polyvinyl butyral - activated carbon fiber network is manufactured by a planar receiving centrifugal spinning process and has a spiral grid structure.

[0020] Further, the grammage of the polyvinyl butyral - activated carbon fiber network is (15 - 20) g / m 2 , where the mass proportion of the activated carbon is 40 - 60%.

[0021] The aforementioned melt - blown carbon cloth is applied to industrial filter meshes and environmental protection filter element products.

[0022] The beneficial effects of the present invention are:

[0023] 1. In the present invention, an activated carbon particle carbon sprinkling device and a conveying channel (conveyor belt) are assembled at the front end of the air flow generator of the existing meltblown spinning equipment, and the activated carbon particles are conveyed to the vicinity of the high-pressure air injection holes, so that the activated carbon particles can be blown into the meltblown fiber expansion area (the spinning solution changes from a solution state to a filament state with a certain length and the diameter becomes larger); at the same time, activated carbon powder with a particularly fine particle size is added to the polyvinyl butyral solution according to a certain proportion to obtain a spinning solution, and this solution is spun into a non-woven fabric with a spiral grid structure (polyvinyl butyral-activated carbon fiber network) by the planar receiving centrifugal spinning process; by assembling a net conveyor curtain under the activated carbon carbon sprinkling device, the polyvinyl butyral-activated carbon fiber network is conveyed through the net conveyor curtain and embedded into the polymer fibers being stretched. The spiral grid structure gives the meltblown non-woven fabric more accommodation space, and the polymer fibers interpenetrate each other to form "wedges", making the spiral grid structure more three-dimensional and firm, so that the blown activated carbon particles can better complete loading, filling and coating. With such a setting, on the one hand, the activated carbon adheres to the fiber surface, and on the other hand, the activated carbon powder is coated and filled between the fibers and in the grid, avoiding shedding and carbon leakage, and doubling the carbon content.

[0024] 2. During the polymer stretching and activated carbon particle loading processes in the present invention, the polyvinyl butyral-activated carbon fiber network is embedded and bonded by the fibers themselves, which not only ensures the structural stability but also avoids the use of adhesives, being green and environmentally friendly. Compared with the existing meltblown composite carbon cloth, the activated carbon particles are adhered inside the fibers, in the pores between the fiber tangles and on the fiber surface, and it has a higher carbon content, better filtration performance and adsorption performance, and is also more durable.

[0025] 3. In the present invention, a net conveyor curtain is assembled under the activated carbon carbon sprinkling device, and 2 / 3 of the net conveyor curtain is a straight section and 1 / 3 is an inclined section with an inclination angle of 150°. With such a design, it can ensure that the polyvinyl butyral-activated carbon fiber network can be better embedded into the stretching area. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a production schematic diagram of the meltblown carbon cloth of the present invention.

[0027] Figure 2 It is a process schematic diagram of the preparation method of the meltblown carbon cloth of the present invention.

[0028] Figure 3 It is an internal structure schematic diagram of the meltblown carbon cloth of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the drawings and specific embodiments.

[0030] Here, it should also be noted that in order to avoid obscuring the present invention due to unnecessary details, only the structures and / or processing steps closely related to the solution of the present invention are shown in the drawings, while other details less related to the present invention are omitted.

[0031] In addition, it should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] In the prior art, if the activated carbon content is too low, the adsorption performance is poor, and if the activated carbon content increases, it is easy to cause blockage of the fiber pores, resulting in poor filtration performance.

[0033] Please refer to Figures 1 to 3 As shown, in the present invention, an activated carbon particle carbon sprinkling device 11 and a conveying channel 12 are assembled at the front end of the air flow generator of the existing meltblown spinning equipment. The present invention provides a method for preparing a meltblown carbon cloth, including the following steps:

[0034] S1, melting the polymer spinning raw material in a screw extruder and spraying it out from the spinneret holes 13 for melt spinning to obtain a nascent fiber in the expansion area;

[0035] Among them, the receiving distance of the melt spinning is 8 - 30 cm, and the spinneret hole diameter is 0.16 - 0.51 mm.

[0036] S2, using air flow to blow the activated carbon particles to the nascent fiber at the meltblown expansion area. In this area, the activated carbon adheres to the inside and outside of the nascent fiber, and then it is further stretched in the stretching area to obtain an unbonded and shaped polymer-activated carbon fiber web;

[0037] Among them, the activated carbon particles are provided by the activated carbon carbon sprinkling device 11 arranged at the front end of the air flow generator in the existing meltblown spinning equipment, and reach the air flow blowing port through the conveying channel 12; the wind pressure of the air flow is 0.3 ± 0.05 mp, the rotation speed of the activated carbon carbon sprinkling device 11 is 10 ± 1 Hz, and the blowing amount of the activated carbon particles is 20 - 40 mg / s.

[0038] S3, mixing and dissolving polyvinyl butyral powder and activated carbon powder to obtain a polyvinyl butyral-activated carbon spinning solution, and then spinning by a planar receiving type centrifugal spinning process to obtain a polyvinyl butyral-activated carbon fiber web 2 with a spiral grid structure. It should be noted that the fiber webs are stacked layer by layer, and the spinning tank filled with the spinning solution moves left and right, so regular gaps are formed between the fibers, which are called "grids" here, that is, the grids in the polyvinyl butyral-activated carbon fiber web 2 with a spiral grid structure.

[0039] Among them, polyvinyl butyral powder is dissolved in a solvent to obtain a polyvinyl butyral solution with a mass fraction of 12-14%; the mass proportion of activated carbon powder is 40-60% of the total mass of polyvinyl butyral powder and activated carbon powder. The grammage of the polyvinyl butyral-activated carbon fiber web is (15-20) g / m 2 .

[0040] The activated carbon powder used in the centrifugal spinning process is prepared from activated carbon particles.

[0041] In the planar receiving centrifugal spinning process, the spinning speed is 4500-5500 rpm, the aperture of the spinning needle is 0.21-0.41 mm, and the collection height is 6-8 cm.

[0042] S4. The polyvinyl butyral-activated carbon fiber web obtained in step S3 is transported and embedded into the polymer-activated carbon fiber web stretched in step S2 through the mesh conveyor 14. Utilizing the self-bonding of the polymer, the polymer-activated carbon fiber web and the polyvinyl butyral-activated carbon fiber web 2 are interpenetrated and bonded to each other on the collection plate 3 to form a melt-blown carbon cloth with activated carbon loaded inside and on the surface of the fibers.

[0043] In particular, a mesh conveyor 14 is assembled below the activated carbon spreading device 11 of the present invention. 2 / 3 of the mesh conveyor is a straight section, and 1 / 3 is an inclined section with an inclination angle of 150°. With such a design, it can ensure that the polyvinyl butyral-activated carbon fiber web 2 is better embedded into the stretching area.

[0044] The present invention also provides a melt-blown carbon cloth prepared by the aforementioned preparation method. The melt-blown carbon cloth includes polymer fibers, a polyvinyl butyral-activated carbon fiber web, and activated carbon loaded inside and on the surface of the fibers.

[0045] Among them, the loading amount of activated carbon is 20-50% of the total mass of the melt-blown carbon cloth.

[0046] The polyvinyl butyral-activated carbon fiber web is spun by a planar receiving centrifugal spinning process and has a spiral grid structure. The grammage of the polyvinyl butyral-activated carbon fiber web is (15-20) g / m 2 , among which, the mass proportion of activated carbon is 40-60%.

[0047] Among them, the polymer fibers are one or a combination of more than one of polypropylene fibers, polyester fibers, or polyethylene fibers.

[0048] The activated carbon particles are one or a combination of two of coconut shell charcoal and coal-based charcoal; the particle size of the activated carbon particles is 80 mesh - 150 mesh.

[0049] The foregoing melt-blown carbon cloth is applied in the preparation of industrial filter meshes and environmental protection filter elements.

[0050] The following describes the preparation method of the melt-blown carbon cloth provided by the present invention in combination with specific embodiments. Unless otherwise specified, the raw materials and reagents in the embodiments of the present application are purchased through commercial channels.

[0051] Example 1

[0052] Example 1 provides a preparation method of a melt-blown carbon cloth, including the following steps:

[0053] S1. After drying the polypropylene spinning raw material, it is melted in a screw extruder and ejected from the spinneret hole 13 for melt spinning to obtain nascent filaments in the puffing zone;

[0054] Among them, the polypropylene melting extrusion temperature is 270°C, the spinneret hole diameter is 0.16 mm, and the receiving distance is 20 cm;

[0055] S2. The coconut shell carbon particles are blown to the polypropylene nascent filaments through high-pressure air flow for attachment and further stretching;

[0056] Among them, the powder spreading speed is 10 Hz, and the spraying amount of the coconut shell carbon particles is 20 mg / s;

[0057] S3. A spinning solution is prepared by mixing a polyvinyl butyral powder solution with a mass fraction of 12% and activated carbon powder with a specific gravity of 40%, and centrifugal spinning is carried out to prepare a fiber web with a grammage of 15 g / m 2 ².

[0058] The activated carbon powder with a specific gravity of 40% means that the mass of the activated carbon powder is 40% of the sum of the masses of the polyvinyl butyral powder and the activated carbon powder. The descriptions of the proportion of the activated carbon powder in the text are all expressed in this meaning and will not be repeated for subsequent explanations.

[0059] Among them, the spinning speed is 4500 rpm, the spinning needle hole diameter is 0.21 mm, and the collection height is 8 cm;

[0060] S4. The polyvinyl butyral-activated carbon fiber web 2 prepared in step S3 is transported to the polymer fiber area under stretching, and together with the loaded activated carbon particles and the stretched polymer fibers, they fall onto the collection plate 3. The fibers use their own mutual adhesion to form a polypropylene fiber melt-blown carbon cloth with a helical grid structure and coconut shell carbon particles loaded on the inside and surface.

[0061] The melt-blown carbon cloth obtained in this example includes polypropylene fibers, coconut shell activated carbon 1, and a polyvinyl butyral-activated carbon fiber web 2 with a grammage of 15 g / m 2 ², and its schematic diagram is as Figure 3 shown. Among them, the average particle size of the coconut shell carbon is 80-150 mesh mixed carbon.

[0062] Using the solution of Example 1, three melt-blown carbon cloths with different grammages and thicknesses were spun, and the relevant parameters are shown in the following table.

[0063]

[0064]

[0065] Performance tests were carried out on the above three products, and the results are shown in the following table.

[0066]

[0067] As can be seen from the above table, under the conditions of controlling the receiving distance, spinning hole diameter, carbon spreading amount, and grammage of polyvinyl butyral-activated carbon fiber mesh, three melt-blown carbon cloths with different grammages and thicknesses were spun. The grammage of this melt-blown carbon cloth is 310±31 g, and the thickness is 4.5±1 mm. It can be used as a filter element or directly for filtration. It can be seen that the filtration efficiency of the three samples is above 99.1%, the resistance <22 Pa, the antibacterial effect >99%, the antiviral rate >95%, and the mildew-proof grade is 0.

[0068] Examples 2-5 and Comparative Examples 1-4

[0069] Examples 2-5 and Comparative Examples 1-4 provide a preparation method of melt-blown carbon cloth. Compared with Example 1, the difference is that the process parameters of step S3 are changed, and the other steps are substantially the same as those of Example 1, so they will not be elaborated here. The specific process parameters and experimental results are shown in the following table.

[0070]

[0071] The spiral grid structure of this melt-blown carbon cloth is given by the polyvinyl butyral-activated carbon fiber mesh prepared by the centrifugal spinning process, and it is necessary to ensure a good spiral grid structure.

[0072] From the experimental results of Examples 1-3 and Comparative Examples 1-2, it can be seen that when the polyvinyl butyral, activated carbon powder, and collection height remain unchanged, when the spinning speed is below 4500 rpm, the centrifugal force is not enough to overcome the surface tension of the solution and the wall resistance of the spinning tank, resulting in less filament output, more droplets, and poor filament formation; when the spinning speed exceeds 5500 rpm, the centrifugal force is too large, resulting in fiber breakage; when the spinning speed is controlled at 4500-5500 rpm, the spiral grid structure remains intact.

[0073] From the experimental results of Example 1, Examples 4 - 5 and Comparative Examples 3 - 4, it can be seen that when the polyvinyl butyral, activated carbon powder and spinning speed remain unchanged, by changing the collection height, when the collection height is below 6 cm, the fibers are not fully stretched and the fibers are adhered to each other; when the collection height is above 8 cm, the fibers are entangled, there is floating filament, and beading phenomenon occurs; when the collection height is maintained at 6 - 8 cm, the spiral grid structure remains intact.

[0074] That is, only when the spinning speed is controlled at 4500 - 5500 rpm and the collection height is maintained at 6 - 8 cm, can a polyvinyl butyral - activated carbon fiber web with a complete spiral grid structure be obtained.

[0075] Examples 6 - 7 and Comparative Examples 5 - 6

[0076] Examples 6 - 7 and Comparative Examples 5 - 6 provide a preparation method of melt - blown carbon cloth. Compared with Example 1, the difference lies in changing the addition ratio of activated carbon powder in step S3, and the other steps are substantially the same as those in Example 1, so they will not be elaborated here. The specific process parameters and experimental results are shown in the following table.

[0077]

[0078] As can be seen from the above table, when the polyvinyl butyral, spinning speed and collection height remain unchanged, when the addition ratio of activated carbon powder is less than 40%, the phenomenon of incomplete filling will occur on the surface and inside of the fibers, resulting in the failure of the melt - blown carbon cloth to meet the requirements in terms of various properties such as filtration performance, adsorption performance, and microbial performance. When the addition ratio of activated carbon powder is higher than 60%, "overflow" and over - filling phenomena will occur on the surface and inside of the fibers, and the various properties reach saturation and cannot be improved, resulting in too high costs; when the addition ratio of activated carbon powder is maintained at 40 - 60%, the filling amount on the surface and inside of the fibers is just right, and the various properties of the melt - blown carbon cloth meet the requirements.

[0079] Example 8

[0080] Example 8 provides a preparation method of melt - blown carbon cloth. Compared with Example 1, the main process changes are shown in the following table, and the other steps are substantially the same as those in Example 1, so they will not be elaborated here.

[0081] Comparison of main parameters and performance between Example 8 and Example 1

[0082]

[0083] Using the scheme of Example 8, three kinds of melt - blown carbon cloths with different grammages and thicknesses are spun, and the relevant parameters are shown in the following table.

[0084]

[0085] Performance tests were conducted on the above three products, and the results are shown in the following table.

[0086]

[0087]

[0088] As can be seen from the above table, when the receiving distance is 20 cm, the spinning aperture is 0.16 mm, and the weight of the polyvinyl butyral-activated carbon fiber mesh is 20 g / m 2 Under the condition that the carbon application amount is maintained at 40%, the weight of the melt-blown carbon cloth prepared is 840 ± 84 g, the thickness is 12 ± 2 mm, the filtration efficiency of the three products is > 99.97%, the resistance is within 35 Pa, the antibacterial rates against Escherichia coli and Staphylococcus aureus are both ≥ 99.99%, the antiviral rate against influenza A H1N1 virus is ≥ 99.99%, and the mildew-proof grade is 0.

[0089] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A preparation method of a melt-blown carbon cloth, characterized in that, It includes the following steps: S1. Melt the polymer spinning raw material in a screw extruder and eject it from the spinneret holes for melt spinning to obtain a nascent fiber in the puffing area. S2. Use air flow to blow activated carbon particles to the nascent fiber in the meltblown puffing area. In this area, the activated carbon adheres to the inside and outside of the nascent fiber, and then further stretch it in the stretching area to obtain a polymer-activated carbon fiber web that has not been bonded and shaped. S3. Mix and dissolve polyvinyl butyral powder and activated carbon powder to obtain a polyvinyl butyral-activated carbon spinning solution, and then spin it using a planar receiving centrifugal spinning process to obtain a polyvinyl butyral-activated carbon fiber web with a spiral grid structure. S4. Convey and embed the polyvinyl butyral-activated carbon fiber web obtained in step S3 onto the polymer-activated carbon fiber web stretched in step S2 through a mesh conveyor curtain. Utilize the self-bonding of the polymer, and the polymer-activated carbon fiber web and the polyvinyl butyral-activated carbon fiber web are interpenetrated, compounded, and bonded to each other on the collection plate to form a meltblown carbon cloth with activated carbon loaded on the inside and surface of the fiber.

2. The preparation method of the melt-blown carbon cloth according to claim 1, characterized in that, In step S2, the activated carbon particles are provided by an activated carbon carbon-spreading device at the front end of the air flow generator of the meltblown spinning equipment, and reach the air flow blowing port through the conveying channel; the air pressure of the air flow is 0.3 ± 0.05 mp, the rotation speed of the activated carbon carbon-spreading device is 10 ± 1 Hz, and the blowing amount of the activated carbon particles is 20 - 40 mg / s.

3. The preparation method of the melt-blown carbon cloth according to claim 1, characterized in that, In step S3, dissolve the polyvinyl butyral powder in a solvent to obtain a polyvinyl butyral solution with a mass fraction of 12 - 14%; the mass ratio of the activated carbon powder is 40 - 60% of the total mass of the polyvinyl butyral powder and the activated carbon powder.

4. The preparation method of the melt-blown carbon cloth according to claim 1, wherein, In step S3, the grammage of the polyvinyl butyral-activated carbon fiber web is (15-20) g / m 2 .

5. The preparation method of the melt-blown carbon cloth according to claim 1, wherein, In step S3, in the planar receiving centrifugal spinning process, the spinning speed is 4500 - 5500 rpm, the aperture of the spinning needle is 0.21 - 0.41 mm, and the collection height is 6 - 8 cm.

6. A melt-blown carbon cloth, prepared by the method for preparing a melt-blown carbon cloth according to any one of claims 1-5, characterized in that: The meltblown carbon cloth includes polymer fibers, a polyvinyl butyral-activated carbon fiber web, and activated carbon loaded on the inside and surface of the fiber; the loading amount of the activated carbon is 20 - 50% of the total mass of the meltblown carbon cloth.

7. The melt-blown carbon cloth according to claim 6, wherein The polymer fibers are one or a combination of polypropylene fibers, polyester fibers, or polyethylene fibers; the activated carbon particles are one or a combination of coconut shell charcoal and coal-based charcoal; the particle size of the activated carbon particles is 80 mesh - 150 mesh.

8. The melt-blown carbon cloth according to claim 6, wherein, The polyvinyl butyral-activated carbon fiber web is manufactured by a planar receiving centrifugal spinning process and has a spiral grid structure.

9. The melt-blown carbon cloth according to claim 6, wherein The grammage of the polyvinyl butyral-activated carbon fiber web is (15-20) g / m 2 , wherein the mass proportion of the activated carbon is 40-60%.

10. Application of a meltblown carbon cloth, characterized in that, The meltblown carbon cloth is obtained by the preparation method described in any one of claims 1 - 5 or is the meltblown carbon cloth described in claims 6 - 9; the meltblown carbon cloth is used in industrial filter meshes and environmental protection filter element products.

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