AU2020101471A4 - A Method for Recovering Carbon Fiber from Carbon Fiber Composite - Google Patents
A Method for Recovering Carbon Fiber from Carbon Fiber Composite Download PDFInfo
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- AU2020101471A4 AU2020101471A4 AU2020101471A AU2020101471A AU2020101471A4 AU 2020101471 A4 AU2020101471 A4 AU 2020101471A4 AU 2020101471 A AU2020101471 A AU 2020101471A AU 2020101471 A AU2020101471 A AU 2020101471A AU 2020101471 A4 AU2020101471 A4 AU 2020101471A4
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- carbon fiber
- fiber composite
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- composite according
- composite
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- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 110
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 110
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 106
- 239000002131 composite material Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 27
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000012298 atmosphere Substances 0.000 claims abstract description 16
- 238000005245 sintering Methods 0.000 claims abstract description 16
- 239000007800 oxidant agent Substances 0.000 claims abstract description 10
- 230000001590 oxidative effect Effects 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 8
- 238000002791 soaking Methods 0.000 claims description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 4
- 229910000423 chromium oxide Inorganic materials 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 230000003197 catalytic effect Effects 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000004821 distillation Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 13
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 10
- 239000000243 solution Substances 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000012300 argon atmosphere Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000197 pyrolysis Methods 0.000 description 4
- 239000012670 alkaline solution Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/04—Disintegrating plastics, e.g. by milling
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
- C08J11/16—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with inorganic material
-
- 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
- D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
- D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
- D01F9/12—Carbon filaments; Apparatus specially adapted for the manufacture thereof
- D01F9/14—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments
- D01F9/20—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from polyaddition, polycondensation or polymerisation products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/04—Disintegrating plastics, e.g. by milling
- B29B2017/0424—Specific disintegrating techniques; devices therefor
- B29B2017/0496—Pyrolysing the materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/30—Polymeric waste or recycled polymer
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Textile Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Fibers (AREA)
Abstract
of Description
The invention discloses a method for recovering carbon fiber from carbon fiber
composite, which comprises the following steps: the carbon fiber composite is soaked
in the solution containing oxidant and then dried to obtain the pretreated carbon fiber
composite; the carbon fiber composite is sintered in muffle furnace under inert
atmosphere; then, the carbon fiber composite is sintered by microwave under air
atmosphere; after sintering, the composite is naturally cooled to room temperature and
washed by ultrasonic in water or ethanol, then dried to obtain the recycled carbon
fiber. In the prior art, carbon fiber recovery will cause environmental pollution, and
the recycled carbon fiber is of poor quality. While the carbon fiber recovery method
provided by the invention is simple to operate and overcomes the existing technical
problems, and the carbon fiber recovery rate is as high as 85%.
Description
Description
A Method for Recovering Carbon Fiber from Carbon Fiber Composite
Technical Field The invention relates to the technical field of carbon fiber composite recycling, in particular to a method for recovering carbon fiber from carbon fiber composite.
Technical Background Carbon fiber polymer composites are widely used in industrial fields such as space shuttles, golf clubs, automobiles, wind power generation, and medical equipment. However, there are problems in the disposal of waste materials such as leftover materials produced in the manufacturing stage or carbon fiber composite of scrapped products at the end of their service life. In the prior art, the main method to solve the above problems is to decompose the polymer matrix in carbon fiber composite, so that the carbon fibers therein are separated to achieve the purpose of carbon fiber recovery. Currently, landfill, mechanical crushing method and pyrolysis are the main methods for the disposal of waste FRP. The landfill method causes a large amount of land resources to be occupied, environmental pollution and serious waste of resources. The products recovered by mechanical crushing method are of low utilization value. The pyrolysis method has some disadvantages such as high energy consumption, unrecoverable resin and serious damage to fiber properties.
Invention Summary In order to solve the above technical problems, the present invention provides a method for recovering carbon fiber from carbon fiber composite;
A method for recovering carbon fiber from carbon fiber composite is characterized in the fact that it includes the following steps:
(1) The carbon fiber composite is soaked in oxidant solution and then dried to obtain the pretreated carbon fiber composite;
(2) The carbon fiber composite is sintered under inert atmosphere;
(3) The sinter in step (2) is sintered by microwave under air atmosphere;
(4) After the sintering in step (3), the sinter is naturally cooled to room temperature, and washed in water or ethanol and dried;
Description
(5) The solvent obtained in step (4) is recovered by distillation to obtain the catalytic oxidant and reused.
Preferably, in step (1), the carbon fiber composite is cut before soaking, and the cutting size is (30-50) mmx(10-20) mmx(1-5) mm.
Preferably, in step (1), the oxidant solution is either chromium oxide or manganese oxide or alkali solution of the two mixtures, with the mass fraction of 0.1-0.5%.
Preferably, in step (1), the soaking temperature is 50-80°C, and the soaking time is not less than 4h.
Preferably, in step (3), in the air atmosphere, the microwave frequency is 1-3Ghz and the sintering time is 0.5-lh.
Preferably, the sintering temperature by microwave is 250-350°C.
Preferably, in step (3), the sinter is naturally cooled to 250-350°C before being sintered by microwave.
Preferably, in step (4), the composite is cleaned 3-5 times by ultrasonic with water or ethanol, and the cleaning time is not less than 20min each time. The drying temperature is 50-80°C.
Preferably, the inert gas is argon or nitrogen, with content of 85-100%, sintering temperature of 500-600 °C, and sintering time of 1-3h.
The invention also provides the carbon fiber recovered by the method for recovering carbon fiber from carbon fiber composite.
Compared with the prior art, the invention has the following beneficial effects:
(1) Before the recycling, the carbon fiber composite is first soaked in the oxidant alkaline solution to remove the impurities in the carbon fiber composite. At the same time, under the action of alkali liquor, new pores and cracks are generated at the interface between fiber and resin. As a result, the resin matrix expands and plasticizes, pores in the resin matrix increase, and oxidant molecules disperse on the surface and inside the resin, thus contributing to subsequent pyrolysis treatment.
Description
(2) For carbon fiber composites, organic composites with carbon fibers may be non-absorbing materials, which cannot be directly heated by microwave. However, carbon fiber has a good absorbing performance. A lot of carbon fibers are contained in the carbon fiber composites, which are adhered to each other by composites. During the microwave heating, the carbon fiber converts the microwave energy into heat in the microwave field to increase the temperature, and then the temperature is transmitted to the composite, thereby achieving the purpose of heating the carbon fiber composite;
(3) The carbon fiber composite subjected to oxidation pretreatment is sintered at high temperature under inert atmosphere. During the heating process, the composite bonded with the carbon fiber undergoes a cracking reaction to form deposited carbon on the surface of the carbon fiber. After the above treatment, it is sintered by microwave under oxygen atmosphere. Compared with the traditional heating method, microwave heating has the advantages of fast heating rate and short heating time. Then the reaction temperature is controlled to change the reaction environment to air atmosphere. Under aerobic conditions, uncracked organics in the composite are further decomposed. At the same time, the deposited carbon on the surface of carbon fiber produced by pyrolysis and decomposition is oxidized, and the carbon dioxide generated is removed, so that no carbon is deposited on the surface of carbon fiber. When held for too short, there will be deposited carbon on the surface of recycled carbon fiber, which will affect the performance of carbon fiber; when held for too long, carbon fibers may be oxidized, reducing the recovery efficiency and performance of carbon fibers.
(4) The carbon fiber obtained through the above reactions is fully washed in ethanol solution to remove impurities without participating in the reaction, so that the recovered carbon fiber is clean and loose, and the surface is clean and complete, which solves the problem of serious carbon fiber bonding.
Detailed Description of the Presently Preferred Embodiments Although various embodiments of the present invention will be described herein, it is understood that these embodiments are presented by way of example only, and not limitation.
The terms used in the present application are merely used to describe particular embodiments, and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it shall be understood that each intermediate
Description
value between the upper and lower limits of the range is also specifically disclosed. Each smaller range between any stated value or intermediate value within the stated range and any other stated value or intermediate value within the stated range is also included in the present invention. The upper and lower limits of these smaller ranges may be included or excluded independently.
Unless defined otherwise, all technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which this invention belongs. One of ordinary skill in the art will also appreciate that any methods and materials similar or equivalent to those described herein can also be used to practice or test this invention. All the publications cited are incorporated herein by reference. In case of conflict with any incorporated publications, the content of this specification shall prevail.
It is obvious to those skilled in the art that various modifications and changes may be made to these embodiments without departing from the scope or spirit of the present invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification. The specification and embodiments of the present application are merely exemplary.
The terms "including", "comprising", "having", "containing" as used herein are open expressions, meaning including but not limited to.
Embodiment 1
(1) The waste carbon fiber composite (with carbon fiber content of 60%) is cleaned and cut into pieces in the size of 50mmx2Ommx5mm, and then placed in the solution of chromium oxide and sodium hydroxide with a mass fraction of1%, soaked at 80°C for 5h, and then removed.
(2) The carbon fiber composite pretreated in step (1) is placed in the microwave high pressure reaction vessel, and heated to 550°C under argon atmosphere at a microwave frequency of 5GHz and a rate of 100°C/min and sintered for 1h.
(3) Stop heating under argon atmosphere. After the temperature drops to 300°C, the microwave frequency is adjusted to 2GHz and air atmosphere is applied for sintering of 1h.
(4) The product obtained in step (3) is placed in ethanol solution and cleaned by
Description
ultrasonic for 3 times, 20min each time, and dried at 50°C.
After calculation, the carbon fiber recovery rate of carbon fiber composite is %.
Embodiment 2
(1) The waste carbon fiber composite (with carbon fiber content of 60%) is cleaned and cut into pieces in the size of 30mmx2Ommx5mm, and then placed in the solution of manganese oxide with a mass fraction of 0.5% and chromium oxide and sodium hydroxide with a mass fraction of 0.5%, soaked at 60°C for 4h, and then removed and dried at 50°C.
(2) The carbon fiber composite pretreated in step (1) is placed in muffle furnace, and heated to 600°C under argon atmosphere at a rate of 80°C/min and sintered for 2h.
(3) Stop heating under argon atmosphere. The carbon fiber composite is removed and placed in the microwave oven. The microwave frequency is adjusted to 2GHz and air atmosphere is applied for sintering of lh.
(4) The product obtained in step (3) is placed in ethanol solution and cleaned by ultrasonic for 3 times, 20min each time, and dried at 50°C.
After calculation, the carbon fiber recovery rate of carbon fiber composite is 82%.
Embodiment 3
(1) The carbon fiber composite (with carbon fiber content of 60%) is cleaned and cut into pieces in the size of 30mmx2Ommx5mm, and then placed in the solution of manganese oxide and sodium hydroxide with a mass fraction of 1%, soaked at 70°C for 24h, and then removed and dried at 50°C.
(2) The carbon fiber composite pretreated in step (1) is placed in muffle furnace, and heated to 500°C under nitrogen atmosphere at a rate of 50°C/min and sintered for 0.5h.
(3) Take it out after stopping heating, put the sinter in the microwave oven
Description
without reducing the temperature, adjust the microwave frequency to 3GHz, and sinter it for 0.5h in the air atmosphere;
(4) The product obtained in step (3) is placed in ethanol solution and cleaned by ultrasonic for 3 times, 20min each time, and dried at 50°C.
After calculation, the carbon fiber recovery rate of carbon fiber composite is 92%.
Embodiment 4
The same as Embodiment 1, except that the carbon fiber composite is not soaked in alkaline solution as described in step (1);
After calculation, the carbon fiber recovery rate of carbon fiber composite is %, and the surface contains a lot of coke impurities.
Embodiment 5
The same as Embodiment 1, except that the oxidant is not added to the alkaline solution in step (3).
After calculation, the carbon fiber recovery rate of carbon fiber composite is %.
Embodiment 6
The same as Embodiment 1, except that the sintering temperature in step (3) is 400 0 C.
After calculation, the carbon fiber recovery rate of carbon fiber composite is %.
Embodiment 7
The same as Embodiment 1, except that the sintering time in step (3) is 1 h.
After calculation, the carbon fiber recovery rate of carbon fiber composite is %.
Description
Embodiment 8
The same as Embodiment 1, except that step (2) is not performed, and the composite is sintered under air atmosphere instead of inert atmosphere.
After calculation, the carbon fiber recovery rate of carbon fiber composite is %, and the surface contains a lot of coke impurities.
The carbon fibers recovered in embodiments 1-8 and the incomposite raw carbon fiber materials involved in the preparation of carbon fiber composites are tested for strength performance according to Testing Method for Breaking Strength and BreakingElongation of Synthetic Filament Yarns and Textured Yarns (GB/T 14344-93). The thermal conductivity of carbon fiber is measured by laser pulse method, and the test results are shown in Table 1.
Table 1
Tensile strength, Modulus, GPa Thermal MPa conductivity, W/m-K
Embodiment 1 3200 125 0.030 Embodiment 2 3000 120 0.029
Embodiment 3 3100 122 0.030 Embodiment 4 3000 105 0.025 Embodiment 5 2500 95 0.022
Embodiment 6 2200 96 0.021 Embodiment 7 2100 92 0.020
Embodiment 8 2600 115 0.025 Incomposite raw 3500 130 0.035 carbon fiber material
It can be concluded from Table 1 that the performance of carbon fiber is decreased in embodiments 5-8 due to the change of sintering conditions.
Description
The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modifications, alternatives and improvements made within the spirit and principles of the present invention shall fall within the scope of the appended claims.
Claims (10)
1. A method for recovering carbon fiber from carbon fiber composite is characterized in the fact that it includes the following steps:
(1) The carbon fiber composite is soaked in oxidant solution and then dried to obtain the pretreated carbon fiber composite;
(2) The carbon fiber composite is sintered under inert atmosphere;
(3) The sinter in step (2) is sintered by microwave under air atmosphere;
(4) After the sintering in step (3), the sinter is naturally cooled to room temperature, and washed in water or ethanol and then dried;
(5) The solvent obtained in step (4) is recovered by distillation to obtain the catalytic oxidant and reused.
2. A method for recovering carbon fiber from carbon fiber composite according to claim 1, wherein in step (1), the carbon fiber composite is cut before soaking, and the cutting size is (30-50) mmx( 10-20) mm x (1-5) mm.
3. A method for recovering carbon fiber from carbon fiber composite according to claim 1, wherein in step (1), the oxidant solution is either chromium oxide or manganese oxide or alkali solution of the two mixtures, with the mass fraction of 0.1-0.5%.
4. A method for recovering carbon fiber from carbon fiber composite according to claim 1, wherein in the step (1), the soaking temperature is 50-80°C and the soaking time is not less than 4h.
5. A method for recovering carbon fiber from carbon fiber composite according to claim 1, wherein in step (3), in the air atmosphere, the microwave frequency is 1-3Ghz and the sintering time is 0.5-lh.
6. A method for recovering carbon fiber from carbon fiber composite according to claim 1, wherein the sintering temperature by microwave is 250-350°C.
7. A method for recovering carbon fiber from carbon fiber composite according to claim 1, wherein in step (3), the sinter is naturally cooled to 250-350°C before
Claims
being sintered by microwave.
8. A method for recovering carbon fiber from carbon fiber composite according to claim 1, wherein in step (4), the composite is cleaned 3-5 times by ultrasonic with water or ethanol, and the cleaning time is not less than 20min each time. The drying temperature is 50-80°C.
9. A method for recovering carbon fiber from carbon fiber composite according to claim 1, wherein in step (2), the inert gas is argon or nitrogen, with content of -100%, sintering temperature of 500-600 °C, and sintering time of 1-3h.
10. A carbon fiber recovered by the method for recovering carbon fiber from carbon fiber composite according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020101471A AU2020101471A4 (en) | 2020-07-24 | 2020-07-24 | A Method for Recovering Carbon Fiber from Carbon Fiber Composite |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020101471A AU2020101471A4 (en) | 2020-07-24 | 2020-07-24 | A Method for Recovering Carbon Fiber from Carbon Fiber Composite |
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| Publication Number | Publication Date |
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| AU2020101471A4 true AU2020101471A4 (en) | 2020-08-27 |
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| AU2020101471A Ceased AU2020101471A4 (en) | 2020-07-24 | 2020-07-24 | A Method for Recovering Carbon Fiber from Carbon Fiber Composite |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116122038A (en) * | 2022-12-30 | 2023-05-16 | 中国人民解放军军事科学院系统工程研究院 | Carbon fiber sizing agent removing method |
| CN116198056A (en) * | 2023-01-20 | 2023-06-02 | 中国民用航空飞行学院 | Laser recovery method for fiber composite material |
| CN117143392A (en) * | 2023-08-03 | 2023-12-01 | 深圳大学 | Carbon fiber recovery method and recovery device |
-
2020
- 2020-07-24 AU AU2020101471A patent/AU2020101471A4/en not_active Ceased
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116122038A (en) * | 2022-12-30 | 2023-05-16 | 中国人民解放军军事科学院系统工程研究院 | Carbon fiber sizing agent removing method |
| CN116122038B (en) * | 2022-12-30 | 2024-02-27 | 中国人民解放军军事科学院系统工程研究院 | Carbon fiber sizing agent removing method |
| CN116198056A (en) * | 2023-01-20 | 2023-06-02 | 中国民用航空飞行学院 | Laser recovery method for fiber composite material |
| CN117143392A (en) * | 2023-08-03 | 2023-12-01 | 深圳大学 | Carbon fiber recovery method and recovery device |
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