CN116695289A - Method for manufacturing short fibers from carbon fiber leftover materials - Google Patents
Method for manufacturing short fibers from carbon fiber leftover materials Download PDFInfo
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- CN116695289A CN116695289A CN202210186710.2A CN202210186710A CN116695289A CN 116695289 A CN116695289 A CN 116695289A CN 202210186710 A CN202210186710 A CN 202210186710A CN 116695289 A CN116695289 A CN 116695289A
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- 239000000835 fiber Substances 0.000 title claims abstract description 61
- 239000000463 material Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title abstract description 19
- 229920000049 Carbon (fiber) Polymers 0.000 title abstract description 18
- 239000004917 carbon fiber Substances 0.000 title abstract description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title abstract description 13
- 238000005520 cutting process Methods 0.000 claims abstract description 24
- 239000000428 dust Substances 0.000 claims abstract description 15
- 239000007773 negative electrode material Substances 0.000 claims abstract description 12
- 238000004806 packaging method and process Methods 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims description 10
- 239000004744 fabric Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000000746 purification Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000010426 asphalt Substances 0.000 abstract description 11
- 238000004064 recycling Methods 0.000 abstract description 7
- 238000011282 treatment Methods 0.000 abstract description 7
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000012216 screening Methods 0.000 abstract 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 9
- 229910001416 lithium ion Inorganic materials 0.000 description 9
- 239000007772 electrode material Substances 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 239000010405 anode material Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000006229 carbon black Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000007790 scraping Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000001291 vacuum drying Methods 0.000 description 3
- 238000003763 carbonization Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F13/00—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
- Y02E60/10—Energy storage using batteries
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Electrochemistry (AREA)
- Textile Engineering (AREA)
- Materials Engineering (AREA)
- Inorganic Fibers (AREA)
Abstract
The application provides a method for manufacturing short fibers, which mainly comprises the following steps: and conveying leftover materials produced by asphalt-based carbon fiber yarns and felts, cutting twice, screening by meshes, classifying and storing, automatically packaging and carrying out dust treatment. The method has the advantages that the method carries out twice chopping treatment on the carbon fiber leftover materials to obtain the ultra-short materials with different sizes for classification; the recycling and development of waste materials generated in the production process of asphalt-based carbon fiber yarns and felts are realized, the cost is saved, and the production efficiency is high; the recovered ultra-short fiber is used for preparing a negative electrode material, and after the ultra-short fiber is assembled into a battery, the electrical property is tested, and the electrical property is better than that of the same type of product.
Description
Technical Field
The application relates to the field of recycling of leftover materials generated in the production process of asphalt-based carbon fiber yarns and felts, in particular to a method for manufacturing short fibers from asphalt-based carbon fiber yarn leftover materials.
Background
In the fiber and textile industry, after being cut mechanically or manually according to the product size, a large amount of leftover materials with different sizes usually remain, and the sizes of the remaining leftover materials do not meet the requirements of product manufacturing and become industrial waste materials which are difficult to treat, so how to recycle the leftover materials becomes a research trend of the current technology. Pitch-based carbon fibers are carbon fibers prepared by taking substances rich in polycyclic aromatic hydrocarbons such as pitch as raw materials, and performing polymerization, spinning, unmelting and carbonization treatments. The high-performance asphalt-based carbon fiber has the advantages of high modulus, high heat transfer, high conductivity, low thermal expansion coefficient and the like, and can be used in the high-technology fields of aerospace, nuclear energy and the like. Therefore, recycling of pitch-based carbon fibers is becoming an important research focus of current technology.
Chinese patent application CN111809276A discloses a method for recycling and reusing planar fiber leftover materials, and the method is characterized in that the planar recycled materials are cut into small-size strip sheets in a linkage manner, and then the fibers are dispersed or scattered, so that the purpose of recycling the fibers in the leftover materials is realized, and the recycled short fibers are used for preparing needled or non-needled fiber mats, and the performance of the recycled short fibers is close to that of brand-new fiber products. However, the recycled materials are used for preparing the fiber mats, the requirements on the size of the fibers are not high, and the fluctuation of the size of the fibers after cutting is large.
Chinese patent application CN106987926a discloses a preparation method of pitch-based carbon fiber, which is implemented by the following steps: heating asphalt to 473-600K under the protection of inert atmosphere; then applying pressure to 0.1-0.65 Mpa, spinning hollow fiber, collecting the prepared fiber with a filament collecting device, and preparing a series of fiber by adjusting technological parameters; and sequentially performing curing treatment, carbonization treatment and graphitization on the series of fibers to finally prepare a series of carbon fibers with excellent graphite structural characteristics. However, the preparation method of the carbon fiber is complex and has high cost.
Disclosure of Invention
Aiming at the problems existing in the prior art, the application provides a method for manufacturing asphalt-based short fibers, which comprises the steps of carrying out twice cutting and chopping treatment on leftover materials generated in the production process of asphalt-based carbon fibers, classifying the obtained ultra-short materials with different sizes, and preparing a negative electrode material, wherein the performance of the ultra-short materials is better than that of similar products; the recycling of the waste is realized, the cost is saved, and the production efficiency is high.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows:
the application provides a method for manufacturing short fibers, which comprises the following specific steps:
(1) Cutting the leftover materials into short fiber filaments;
(2) Further cutting the short fiber yarn in the step (1) to obtain an ultra-short fiber yarn;
(3) Classifying, storing and packaging the ultra-short fiber yarns obtained in the step (2);
(4) And (3) collecting, filtering and discharging the ultrashort material dust generated in the step (2) and the step (3) through a purifying system.
The length of the leftover materials in the step (1) is 0.1-10 m, and the length of the short fiber filaments is 0.1-3 mm;
the length of the ultra-short fiber filaments in the step (2) is 0.1-100 um.
Further, the staple fibers are pitch-based staple fibers.
Further, in the step (1), the cutting rate is 4-6 m/min, and the negative pressure is set to be minus 0.5 to minus 0.05Mpa.
Further, the length of the ultra-short fiber filaments in the step (2) is 5-90 μm.
Further, the length of the ultra-short fiber filaments in the step (2) is 20-60 μm.
Further, the cutting temperature in the step (2) is set to be 10-30 ℃, and the cutting rate is 1.5-2.5 m/min.
Further, in the step (3), the sorting and storing are multiple layers of materials with different mesh lengths.
Further, the different mesh numbers are set as the first layer: 450-550 mesh, second layer: 750-850 mesh, third layer: 1050-1150 mesh, fourth layer: 1450-1550 mesh, fifth layer: 1950 to 2050 mesh.
Further, the purification system in the step (4) comprises a dust remover, a centrifugal fan and a chimney.
Further, the internal process of the dust remover is cloth bag type filtration, and the mesh number of a filtration cloth bag is set to 2400-2600 meshes.
Further, the purification steps of the purification system are as follows: the centrifugal fan generates negative pressure to absorb the ultra-short material dust to the dust remover for filtration, the filtered dust can be directly discharged to the outside, and the filtration efficiency is between 95 and 98 percent.
Further, the ultra-short fiber obtained by the method is applied to the preparation of the anode material.
Compared with the prior art, the application has the following beneficial effects:
(1) According to the application, the leftover materials generated in the production process of the pitch-based carbon fiber are subjected to twice chopping treatment, the obtained ultra-short materials with different sizes are classified and used for preparing the anode material, and after the anode material is assembled into a battery, the electrical property is tested, and the electrical property is superior to that of the same type of product;
(2) The application realizes the recycling of asphalt-based short fiber waste, saves the cost, has high production efficiency and can realize large-scale production.
Drawings
FIG. 1 is a flow chart of a staple fiber manufacturing process;
marked in the figure as: 1-conveying net belt, 2-short fiber machine, 3-micro powder machine, 4-dust remover, 5-swinging screen, 6-centrifugal fan and 7-chimney.
Detailed Description
It is to be noted that the raw materials used in the present application are all common commercial products, and the sources thereof are not particularly limited.
Asphalt-based carbon fiber (manufacturer: henan Yongshun trade Co., ltd., product number: LQJ-0329).
Example 1
The steps for manufacturing the short fibers by the leftover materials are as follows:
(1) Cutting leftover materials with the length of about 10m into short fiber filaments with the length of about 2mm by a short fiber machine, setting the cutting rate to be 5m/min and setting the negative pressure to be-0.2 Mpa;
(2) Further cutting the short fiber yarn in the step (1) by a micronizer to obtain about 45um of ultra-short fiber yarn, wherein the cutting rate is set to be 2m/min, and the cutting temperature is set to be 25 ℃;
(3) Classifying and storing the ultrashort materials obtained in the step (2) through a swinging sieve, and then automatically packaging through a packaging machine, wherein the mesh number of each layer of the swinging sieve is set as follows: a first layer: 500 mesh, second layer: 800 mesh, third layer: 1100 mesh, fourth layer: 1500 mesh, fifth layer: 2000 mesh;
(4) And (3) absorbing the ultrashort material dust generated in the step (2) and the step (3) to a dust remover through a centrifugal machine, filtering the dust by a cloth bag, and discharging the dust remover, wherein the mesh number of the filtering cloth bag is set to 2500 meshes.
The specific steps for preparing the lithium ion battery are as follows:
(1) Preparing a negative electrode material:
mixing the ultrashort fiber yarn obtained in the step (2) of preparing the short fiber from the leftover material in the embodiment 1 with carbon black and a binder according to the mass ratio of 7.5:2.5:1, grinding uniformly to obtain an electrode material, scraping the electrode material on a copper film by a scraper, and then carrying out vacuum drying to obtain a negative electrode material;
(2) Assembling a battery:
the negative electrode material prepared by the steps is assembled with electrolyte and a lithium positive electrode to form a lithium ion battery;
(3) Performance test:
circulating the lithium ion battery obtained in the steps under the current density of 0.1A/g, and testing the performance of the battery; the cycle performance of the battery is shown in Table 1, and the specific discharge capacity is 391.2mAh/g after 5 cycles and 375.2mAh/g after 15 cycles.
Example 2
The steps for manufacturing the short fibers by the leftover materials are as follows:
setting the cutting rate in the step (1) to be 6m/min, and setting the negative pressure to be-0.1 Mpa; the cutting rate in the step (2) was 1.5m/min, the cutting temperature was set to 15℃and the rest of the procedure was the same as in example 1.
The specific steps for preparing the lithium ion battery are as follows:
(1) Preparing a negative electrode material:
mixing the ultrashort fiber yarn obtained in the step (2) of preparing the short fiber from the leftover material of the example 2 with carbon black and a binder according to the mass ratio of 7.5:2.0:1, grinding uniformly to obtain an electrode material, scraping the electrode material on a copper film by a scraper, and then carrying out vacuum drying to obtain a negative electrode material;
(2) Assembling a battery:
the negative electrode material prepared by the steps is assembled with electrolyte and a lithium positive electrode to form a lithium ion battery;
(3) Performance test:
circulating the lithium ion battery obtained in the steps under the current density of 0.1A/g, and testing the performance of the battery; the cycle performance of the battery is shown in Table 1, and the specific discharge capacity is 387.6mAh/g after 5 cycles and 370.2mAh/g after 15 cycles.
Example 3
The steps for manufacturing the short fibers by the leftover materials are as follows:
setting the cutting rate in the step (1) of manufacturing the short fibers from the leftover materials to 7m/min, and setting the negative pressure to-0.6 Mpa; the cutting rate in the step (2) was 1m/min, the cutting temperature was set to 35℃and the rest of the procedure was the same as in example 1.
(1) Preparing a negative electrode material:
mixing the ultrashort fiber yarn obtained in the step (2) of preparing the short fiber from the leftover material in the embodiment 3 with carbon black and a binder according to the mass ratio of 7.5:2.5:1, grinding uniformly to obtain an electrode material, scraping the electrode material on a copper film by a scraper, and then carrying out vacuum drying to obtain a negative electrode material;
(2) Assembling a battery:
the negative electrode material prepared by the steps is assembled with electrolyte and a lithium positive electrode to form a lithium ion battery;
(3) Performance test:
circulating the lithium ion battery obtained in the steps under the current density of 0.1A/g, and testing the performance of the battery; the cycle performance of the battery is shown in Table 1, and the specific discharge capacity is 369.2mAh/g after 5 cycles and 353.2mAh/g after 15 cycles.
Comparative example 1
In the step of preparing a lithium ion battery in example 1, the ultrashort fiber yarns are replaced by common commercial asphalt-based carbon fiber materials, the rest steps are the same as those in example 1, the obtained battery is circulated at a current density of 0.1A/g, and the battery performance is tested; the cycle performance of the battery is shown in Table 1, and the specific discharge capacity is 371.2mAh/g after 5 cycles and 355.2mAh/g after 15 cycles.
Table 1 results of battery performance experiments for the products
Finally, it should be noted that the above description is only for illustrating the technical solution of the present application, and not for limiting the scope of the present application, and that the simple modification and equivalent substitution of the technical solution of the present application can be made by those skilled in the art without departing from the spirit and scope of the technical solution of the present application.
Claims (10)
1. A method for making a staple fiber, comprising the steps of:
(1) Cutting the leftover materials into short fiber filaments;
(2) Further cutting the short fiber yarn in the step (1) to obtain an ultra-short fiber yarn;
(3) Classifying, storing and packaging the ultra-short fiber yarns obtained in the step (2);
(4) Collecting, filtering and discharging the ultrashort material dust generated in the step (2) and the step (3) through a purifying system;
the length of the leftover materials in the step (1) is 0.1-10 m, and the length of the short fiber filaments is 0.1-3 mm;
the length of the ultra-short fiber filaments in the step (2) is 0.1-100 um.
2. The method according to claim 1, characterized in that: the cutting rate in the step (1) is 4-6 m/min, and the negative pressure is set to be minus 0.5 to minus 0.05Mpa.
3. The method according to claim 1, characterized in that: the length of the ultra-short fiber filaments in the step (2) is 5-90 mu m.
4. A method according to claim 3, characterized in that: the length of the ultra-short fiber filaments in the step (2) is 20-60 mu m.
5. The method according to claim 1, characterized in that: the cutting temperature in the step (2) is set to be 10-30 ℃ and the cutting rate is 1.5-2.5 m/min.
6. The method according to claim 1, characterized in that: and (3) classifying and storing the materials into multiple layers and vertically storing the materials with different mesh numbers and lengths.
7. The method according to claim 6, wherein: the different mesh numbers are set as a first layer: 450-550 mesh, second layer: 750-850 mesh, third layer: 1050-1150 mesh, fourth layer: 1450-1550 mesh, fifth layer: 1950 to 2050 mesh.
8. The method according to claim 1, characterized in that: the purification system in the step (4) comprises a dust remover, a centrifugal fan and a chimney.
9. The method according to claim 8, wherein: the internal process of the dust remover is cloth bag type filtration, and the mesh number of a filtration cloth bag is set to 2400-2600 meshes.
10. Use of the ultra-short fiber filaments obtained by the method according to any one of claims 1 to 9 for the preparation of a negative electrode material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210186710.2A CN116695289A (en) | 2022-02-28 | 2022-02-28 | Method for manufacturing short fibers from carbon fiber leftover materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210186710.2A CN116695289A (en) | 2022-02-28 | 2022-02-28 | Method for manufacturing short fibers from carbon fiber leftover materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116695289A true CN116695289A (en) | 2023-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210186710.2A Pending CN116695289A (en) | 2022-02-28 | 2022-02-28 | Method for manufacturing short fibers from carbon fiber leftover materials |
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| Country | Link |
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| CN (1) | CN116695289A (en) |
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2022
- 2022-02-28 CN CN202210186710.2A patent/CN116695289A/en active Pending
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