CN110857341A - Degradation solvent and degradation method for carbon fiber resin matrix composite material - Google Patents

Degradation solvent and degradation method for carbon fiber resin matrix composite material Download PDF

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Publication number
CN110857341A
CN110857341A CN201810964455.3A CN201810964455A CN110857341A CN 110857341 A CN110857341 A CN 110857341A CN 201810964455 A CN201810964455 A CN 201810964455A CN 110857341 A CN110857341 A CN 110857341A
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carbon fiber
composite material
degradation
resin matrix
matrix composite
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隋刚
吴天宇
梁向裔
张文卿
杨小平
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Beijing University of Chemical Technology
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Beijing University of Chemical Technology
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    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C08K7/06—Elements
    • 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
    • C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

The invention provides a degradation solvent for a carbon fiber resin matrix composite material and a method for recovering carbon fibers by catalytic pyrolysis of the carbon fiber resin matrix composite material, and belongs to the technical field of recovery of carbon fiber resin matrix composite materials. The main component of the degradation solvent is phosphoric acid or sulfurous acid, and the recovery method of the recovered carbon fiber comprises the following steps: mixing the carbon fiber composite material with a degradation solvent, and adding the mixture into a reaction kettle; heating the reaction kettle to 150-300 ℃, and preserving heat for 30-120 min; and taking out the degradation product from the reaction kettle, ultrasonically cleaning the degradation product in water for 10min, and drying the degradation product to obtain the recycled carbon fiber. According to the invention, the degradation temperature is obviously reduced, the degradation time is shortened, the recovery rate is ensured, the original carbon fiber is not damaged, the mechanical property of the recovered carbon fiber is kept above 90%, the degradation solvent can be recycled after the separation process, and the recovery cost is reduced.

Description

Degradation solvent and degradation method for carbon fiber resin matrix composite material
Technical Field
The invention relates to the technical field of carbon fiber resin matrix composite material recovery, in particular to a solvent capable of degrading and recovering a carbon fiber resin matrix composite material and a method for recovering carbon fibers from the carbon fiber resin matrix composite material.
Background
The carbon fiber resin matrix composite material has the characteristics of light weight, high strength, heat resistance, corrosion resistance, high modulus and the like. Due to these excellent characteristics, it is widely used in the fields of aerospace, sports equipment, automobile parts, wind power generation, electronic products, and the like, and the usage amount is increasing continuously.
The huge application market of carbon fiber resin-based composite materials also brings some problems. With the increase of the using amount, a large amount of composite material waste is generated in the production and use processes. These include uncured prepregs, scrap from the manufacturing process, used or discarded waste, and the like. These wastes present significant disposal problems. At present, carbon fiber resin matrix composite materials are treated by storing heat after combustion, or by cutting into powder or particles as filler, paving material and the like, or even by landfill. The carbon fiber reinforced resin composite material contains high-value carbon fibers, and the treatment modes undoubtedly cause great waste of carbon fiber resources.
The recovery methods which have been disclosed in the prior art include thermal decomposition, organic solvent decomposition, supercritical fluid decomposition, oxidation fluidized bed method, and the like. The fiber surface obtained by thermal decomposition still has more impurities, and different process parameters are required to be adjusted for wastes with different fiber contents and different volumes; relatively clean fibers can be obtained by decomposing the organic solvent, but a large amount of generated organic waste liquid is difficult to treat, and the operation cost is relatively high; although the supercritical fluid decomposition has the characteristics of cleanness and no pollution, the decomposition needs to be carried out under the reaction conditions of high temperature and high pressure, and the requirement on reaction equipment is higher; the fibers recovered by the oxidation fluidized bed method are not uniform in length, and may be greatly damaged due to severe oxidation reaction and violent movement and impact in a reactor, a separator, etc., and the recovered fibers are poor in performance.
Disclosure of Invention
Aiming at the problems, the invention provides a degradation solvent for a carbon fiber resin matrix composite material and a recovery method for recovering carbon fibers from the carbon fiber resin matrix composite material, the method has the advantages of high recovery efficiency, low cost and convenient process, the recovered fibers can also keep better mechanical property, and the technical support is provided for the reutilization of the carbon fiber resin matrix composite material.
A degradation solvent for a carbon fiber resin matrix composite material comprises the following main components: phosphoric acid aqueous solution or sulfurous acid aqueous solution.
Further, the degradation solvent also comprises hydrogen peroxide and benzyl bromide.
Further, the concentration of the phosphoric acid aqueous solution or the sulfurous acid aqueous solution is 40-85%.
Further, the concentration of the hydrogen peroxide is 0-45%, and the concentration of the benzyl bromide is 0-5%.
Further, the matrix resin of the carbon fiber resin matrix composite material is thermosetting resin, and comprises epoxy resin, bismaleimide resin, unsaturated polyester and phenolic resin.
Further, the carbon fiber of the carbon fiber resin-based composite material includes: PAN-based carbon fibers and pitch-based carbon fibers.
Further, the carbon fiber morphology of the carbon fiber resin-based composite material comprises: continuous fibers, long fibers, chopped fibers, powdered fibers, and carbon fiber fabrics.
Meanwhile, the invention also provides a method for recovering carbon fibers by catalytic pyrolysis of the carbon fiber resin matrix composite, which comprises the following steps:
mixing the carbon fiber resin matrix composite material with a degradation solvent; reacting for 30-120 min at the temperature of 150-300 ℃; and after the reaction is finished, taking out the degradation product of the composite material, ultrasonically cleaning the degradation product by using water, and drying the degradation product to obtain the recycled carbon fiber.
Wherein the degradation solvent is phosphoric acid aqueous solution or sulfurous acid aqueous solution.
Preferably, the degradation solvent is: a mixed aqueous solution of phosphoric acid or sulfurous acid with a concentration of 40-85% and hydrogen peroxide with a concentration of 0-45%.
The matrix resin of the carbon fiber resin matrix composite material is thermosetting resin and comprises epoxy resin, bismaleimide resin, unsaturated polyester and phenolic resin; the carbon fiber of the carbon fiber resin matrix composite material comprises: PAN-based carbon fibers and pitch-based carbon fibers; the carbon fiber form of the carbon fiber resin matrix composite material comprises: continuous fibers, long fibers, chopped fibers, powdered fibers, and carbon fiber fabrics.
Advantageous effects
The essence of the invention lies in catalyzing and degrading the resin matrix in the waste carbon fiber reinforced resin composite material, and keeping the fiber not damaged, innovatively controlling the oxidability of the degradation solvent, so that the resin matrix is degraded and does not react with the carbon fiber, and the performance of the carbon fiber is ensured. The cost required in the degradation process is low, the process is simple, and the large-scale production is easy to carry out. The recycled fiber has good orderliness and little performance reduction, and the recycling effect can meet the recycling condition.
The present invention uses a degradation solvent whose main components are phosphoric acid or sulfurous acid and hydrogen peroxide, and can accelerate the degradation of the resin matrix. The moderate acidity and the oxidizability of the solvent can completely degrade and remove the resin matrix, and simultaneously, the surface performance and the mechanical property of the fiber cannot be influenced. The swelling effect of the reagent can also promote the interlayer peeling of the composite material, and the uniform quality of the recycled carbon fiber is ensured. The degradation solvent can be reused through a recycling process.
Compared with the prior art for recovering carbon fibers, the method adopts the combination of sulfurous acid, phosphoric acid and hydrogen peroxide, so that the damage degree to the carbon fibers is remarkably reduced, the loss rate is remarkably reduced, and the degradation rate is improved. The invention has simple operation process and lower requirement on operation equipment, and is suitable for industrial scale-up production. Compared with the existing carbon fiber composite material recovery technology, the recovery temperature is obviously reduced, the recovery time is shortened, the operation condition is mild, the problem that the composite material laminated plate is difficult to strip from layers is solved, the performance quality unevenness caused by the difference of the reaction time of the outer layer fiber and the inner layer fiber is avoided, and the product quality when the recovered carbon fiber is utilized is ensured. Therefore, the invention has the advantages of high efficiency, convenience, economy, good product quality and the like, and has wide market prospect.
The specific implementation mode is as follows:
the present invention is illustrated in detail by the following examples and comparative examples. In the embodiment of the invention, all the reagents used are analytically pure.
Example 1
The carbon fiber in the selected waste carbon fiber resin matrix composite material is Dongli T700, the tensile strength of a fiber filament is 4.90GPa, the resin matrix is 4,4' -diaminodiphenylmethane epoxy resin, the curing agent is diaminodiphenyl sulfone (DDS), the carbon fiber is PAN-based carbon fiber, and the carbon fiber is in a form of continuous fiber, wherein the weight content of the carbon fiber is 60%.
The embodiment provides a method for recycling carbon fibers in waste carbon fiber resin matrix composite materials, which comprises the following specific steps:
1. in this example, the degradation solvent was an aqueous phosphoric acid solution having a phosphoric acid concentration of 85%.
2. Cutting a carbon fiber resin matrix composite material with the thickness of 2mm into 25cm2Mixing the carbon fiber resin matrix composite material with a degradation solvent, and adding the mixture into a reaction kettle, wherein the volume ratio of the carbon fiber resin matrix composite material to the degradation solvent is 1:2 (V/V).
3. The reaction kettle is heated to 150 ℃ and is kept warm for 120 min.
4. And taking out the degradation product, ultrasonically cleaning the degradation product by using water, taking out the fiber and drying the fiber.
The carbon fiber was subjected to a monofilament tensile test according to ASTM-D3379, to obtain a monofilament tensile strength of 4.60Gpa and a strength retention of 93.9%.
Example 2
The carbon fiber in the selected waste carbon fiber resin matrix composite material is Dongli T700, the tensile strength of a fiber filament is 4.90GPa, the resin matrix is 4,4' -diaminodiphenylmethane epoxy resin, the curing agent is diaminodiphenyl sulfone (DDS), the carbon fiber is PAN-based carbon fiber, and the carbon fiber is in a form of long fiber, wherein the weight content of the carbon fiber is 60%.
The embodiment provides a method for recycling carbon fibers in waste carbon fiber resin matrix composite materials, which comprises the following specific steps:
1. in this example, the degradation solvent was an aqueous sulfurous acid solution having a sulfurous acid concentration of 85%.
2. Cutting a carbon fiber resin matrix composite material with the thickness of 4mm into 10cm2Mixing the carbon fiber resin matrix composite material with a degradation solvent, and adding the mixture into a reaction kettle, wherein the volume ratio of the carbon fiber resin matrix composite material to the degradation solvent is 1:3 (V/V).
3. The reaction kettle is heated to 240 ℃ and is kept warm for 80 min.
4. And taking out the degradation product, ultrasonically cleaning the degradation product by using water, taking out the fiber and drying the fiber.
The carbon fiber was subjected to a monofilament tensile test according to ASTM-D3379, to obtain a monofilament tensile strength of 4.47Gpa and a strength retention of 91.2%.
Example 3
The carbon fiber in the selected waste carbon fiber resin matrix composite material is Dongli T700, the tensile strength of a fiber filament is 4.90GPa, the resin matrix is 4,4' -diaminodiphenylmethane epoxy resin, the curing agent is diaminodiphenyl sulfone (DDS), the carbon fiber is PAN-based carbon fiber, and the carbon fiber is in a form of chopped fiber, wherein the weight content of the carbon fiber is 60%.
The embodiment provides a method for recycling carbon fibers in waste carbon fiber resin matrix composite materials, which comprises the following specific steps:
1. in this example, the degradation solvent was a mixed aqueous solution having a phosphoric acid concentration of 40% and a hydrogen peroxide concentration of 45%.
2. Cutting a carbon fiber resin matrix composite material with the thickness of 2mm into 20cm2Mixing the carbon fiber resin matrix composite material with a degradation solvent, and adding the mixture into a reaction kettle, wherein the volume ratio of the carbon fiber resin matrix composite material to the degradation solvent is 1:4 (V/V).
3. The temperature of the reaction kettle is raised to 300 ℃, and the temperature is kept for 30 min.
4. And taking out the degradation product, ultrasonically cleaning the degradation product by using water, taking out the fiber and drying the fiber.
The carbon fiber was subjected to a monofilament tensile test according to ASTM-D3379, to obtain a monofilament tensile strength of 4.51GPa and a strength retention of 92.0%.
Example 4
The carbon fiber in the selected waste carbon fiber resin matrix composite material is Dongli T700, the tensile strength of a fiber filament is 4.90GPa, the resin matrix is 4,4' -diaminodiphenylmethane epoxy resin, the curing agent is diaminodiphenyl sulfone (DDS), the carbon fiber is asphalt-based carbon fiber, and the carbon fiber is in a form of powder fiber, wherein the weight content of the carbon fiber is 60%.
The embodiment provides a method for recycling carbon fibers in waste carbon fiber resin matrix composite materials, which comprises the following specific steps:
1. in this example, the degradation solvent was a mixed aqueous solution having a phosphoric acid concentration of 40% and a hydrogen peroxide concentration of 45%.
2. Cutting a carbon fiber resin matrix composite material with the thickness of 2mm into 30cm2Mixing the carbon fiber resin matrix composite material with a degradation solvent, and adding the mixture into a reaction kettle, wherein the volume ratio of the carbon fiber resin matrix composite material to the degradation solvent is 1:6 (V/V).
3. The reaction kettle is heated to 200 ℃ and is kept warm for 80 min.
4. And taking out the degradation product, ultrasonically cleaning the degradation product by using water, taking out the fiber and drying the fiber.
The carbon fiber was subjected to a monofilament tensile test according to ASTM-D3379, to obtain a monofilament tensile strength of 4.71Gpa and a strength retention of 96.1%.
Example 5
The carbon fiber in the selected waste carbon fiber resin matrix composite material is Dongli T800, the tensile strength of a fiber filament is 5.49GPa, the resin matrix is 4,4' -diaminodiphenylmethane epoxy resin, the curing agent is diaminodiphenyl sulfone (DDS), the carbon fiber is PAN-based carbon fiber, and the carbon fiber is in a form of carbon fiber fabric, wherein the weight content of the carbon fiber is 60%.
The embodiment provides a method for recycling carbon fibers in waste carbon fiber resin matrix composite materials, which comprises the following specific steps:
1. in this example, the degradation solvent was a mixed aqueous solution having a phosphoric acid concentration of 60% and a hydrogen peroxide concentration of 25%.
2. Cutting a carbon fiber resin matrix composite material with the thickness of 2mm into 25cm2Mixing the carbon fiber resin matrix composite material with a degradation solvent, and adding the mixture into a reaction kettle, wherein the volume ratio of the carbon fiber resin matrix composite material to the degradation solvent is 1:5 (V/V).
3. The temperature of the reaction kettle is increased to 180 ℃, and the temperature is kept for 80 min.
4. And taking out the degradation product, ultrasonically cleaning the degradation product by using water, taking out the fiber and drying the fiber.
The carbon fiber was subjected to a monofilament tensile test according to ASTM-D3379, to obtain a monofilament tensile strength of 5.27GPa and a strength retention of 96.0%.
Example 6
The carbon fiber in the selected waste carbon fiber resin matrix composite material is Dongli T700, the tensile strength of a fiber monofilament is 4.90GPa, the resin matrix is bisphenol A type unsaturated polyester, the curing agent is methyl ethyl ketone peroxide, the carbon fiber is PAN-based carbon fiber, and the carbon fiber is in a continuous fiber form, wherein the weight content of the carbon fiber is 60%.
The embodiment provides a method for recycling carbon fibers in waste carbon fiber resin matrix composite materials, which comprises the following specific steps:
1. in this example, the degradation solvent was a mixed aqueous solution having a sulfurous acid concentration of 55% and a hydrogen peroxide concentration of 30%.
2. Cutting a carbon fiber resin matrix composite material with the thickness of 3mm into 30cm2Mixing the carbon fiber resin matrix composite material with a degradation solvent, and adding the mixture into a reaction kettle, wherein the volume ratio of the carbon fiber resin matrix composite material to the degradation solvent is 1:8 (V/V).
3. The temperature of the reaction kettle is raised to 220 ℃, and the temperature is kept for 45 min.
4. And taking out the degradation product, ultrasonically cleaning the degradation product by using water, taking out the fiber and drying the fiber.
The carbon fiber was subjected to a monofilament tensile test according to ASTM-D3379, to obtain a monofilament tensile strength of 4.66Gpa and a strength retention of 95.1%.
Example 7
The carbon fiber in the selected waste carbon fiber resin-based composite material is Dongli T700, the tensile strength of a fiber monofilament is 4.90GPa, the resin matrix is bismaleimide resin, the carbon fiber is PAN-based carbon fiber, and the carbon fiber is in a continuous fiber form, wherein the weight content of the carbon fiber is 60%.
The embodiment provides a method for recycling carbon fibers in waste carbon fiber resin matrix composite materials, which comprises the following specific steps:
1. in this example, the degradation solvent is an aqueous solution having a phosphoric acid concentration of 85%.
2. Cutting a carbon fiber resin matrix composite material with the thickness of 2mm into 25cm2Mixing the carbon fiber resin matrix composite material with a degradation solvent, and adding the mixture into a reaction kettle, wherein the volume ratio of the carbon fiber resin matrix composite material to the degradation solvent is 1:3 (V/V).
3. The temperature of the reaction kettle is raised to 210 ℃, and the temperature is kept for 100 min.
4. And taking out the degradation product, ultrasonically cleaning the degradation product by using water, taking out the fiber and drying the fiber.
The carbon fiber was subjected to a monofilament tensile test according to ASTM-D3379, to obtain a monofilament tensile strength of 4.61Gpa and a strength retention of 94.1%.
Example 8
The carbon fiber in the selected waste carbon fiber resin matrix composite material is Dongli T700, the tensile strength of a fiber monofilament is 4.90GPa, the resin matrix is phenolic resin, the carbon fiber is PAN-based carbon fiber, and the carbon fiber is in a form of continuous fiber, wherein the weight content of the carbon fiber is 60%.
The embodiment provides a method for recycling carbon fibers in waste carbon fiber resin matrix composite materials, which comprises the following specific steps:
1. in this example, the degradation solvent was a mixed aqueous solution having a sulfurous acid concentration of 65% and a hydrogen peroxide concentration of 20%.
2. Cutting a carbon fiber resin matrix composite material with the thickness of 2mm into 15cm2Mixing the carbon fiber resin matrix composite material with a degradation solvent, and adding the mixture into a reaction kettle, wherein the volume ratio of the carbon fiber resin matrix composite material to the degradation solvent is 1:1 (V/V).
3. The temperature of the reaction kettle is increased to 180 ℃, and the temperature is kept for 90 min.
4. And taking out the degradation product, ultrasonically cleaning the degradation product by using water, taking out the fiber and drying the fiber.
The carbon fiber was subjected to a monofilament tensile test according to ASTM-D3379, to obtain a monofilament tensile strength of 4.58Gpa and a strength retention of 93.5%.
Example 9
The carbon fiber in the selected waste carbon fiber resin matrix composite material is Dongli T700, the tensile strength of a fiber filament is 4.90GPa, the resin matrix is 4,4' -diaminodiphenylmethane epoxy resin, the curing agent is diaminodiphenyl sulfone (DDS), the carbon fiber is PAN-based carbon fiber, and the carbon fiber is in a form of continuous fiber, wherein the weight content of the carbon fiber is 60%.
The embodiment provides a method for recycling carbon fibers in waste carbon fiber resin matrix composite materials, which comprises the following specific steps:
1. in this example, the degradation solvent is a mixed aqueous solution of 80% phosphoric acid and 5% benzyl bromide.
2. Cutting a carbon fiber resin matrix composite material with the thickness of 2mm into 25cm2Mixing the carbon fiber resin matrix composite material with a degradation solvent, and adding the mixture into a reaction kettle, wherein the volume ratio of the carbon fiber resin matrix composite material to the degradation solvent is 1:2 (V/V).
3. The reaction kettle is heated to 150 ℃ and is kept warm for 120 min.
4. And taking out the degradation product, ultrasonically cleaning the degradation product by using water, taking out the fiber and drying the fiber.
The carbon fiber was subjected to a monofilament tensile test according to ASTM-D3379, to obtain a monofilament tensile strength of 4.72Gpa and a strength retention of 96.3%.
Example 10
The carbon fiber in the selected waste carbon fiber resin matrix composite material is Dongli T700, the tensile strength of a fiber filament is 4.90GPa, the resin matrix is 4,4' -diaminodiphenylmethane epoxy resin, the curing agent is diaminodiphenyl sulfone (DDS), the carbon fiber is PAN-based carbon fiber, and the carbon fiber is in a form of continuous fiber, wherein the weight content of the carbon fiber is 60%.
The embodiment provides a method for recycling carbon fibers in waste carbon fiber resin matrix composite materials, which comprises the following specific steps:
1. in this example, the degradation solvent is a mixed aqueous solution having a sulfurous acid concentration of 82% and a benzyl bromide concentration of 3%.
2. Cutting a carbon fiber resin matrix composite material with the thickness of 2mm into 20cm2Mixing the carbon fiber resin matrix composite material with a degradation solvent, and adding the mixture into a reaction kettle, wherein the volume ratio of the carbon fiber resin matrix composite material to the degradation solvent is 1:4 (V/V).
3. The reaction kettle is heated to 200 ℃ and is kept warm for 50 min.
4. And taking out the degradation product, ultrasonically cleaning the degradation product by using water, taking out the fiber and drying the fiber.
The carbon fiber was subjected to a monofilament tensile test according to ASTM-D3379, to obtain a monofilament tensile strength of 4.62Gpa and a strength retention of 94.3%.
Example 11
The carbon fiber in the selected waste carbon fiber resin matrix composite material is Dongli T700, the tensile strength of a fiber filament is 4.90GPa, the resin matrix is 4,4' -diaminodiphenylmethane epoxy resin, the curing agent is diaminodiphenyl sulfone (DDS), the carbon fiber is PAN-based carbon fiber, and the carbon fiber is in a form of continuous fiber, wherein the weight content of the carbon fiber is 60%.
The embodiment provides a method for recycling carbon fibers in waste carbon fiber resin matrix composite materials, which comprises the following specific steps:
1. in this example, the degradation solvent is a mixed aqueous solution of 50% phosphoric acid, 30% hydrogen peroxide, and 5% benzyl bromide.
2. Cutting a carbon fiber resin matrix composite material with the thickness of 2mm into 25cm2Mixing the carbon fiber resin matrix composite material with a degradation solvent, and adding the mixture into a reaction kettle, wherein the volume ratio of the carbon fiber resin matrix composite material to the degradation solvent is 1:3 (V/V).
3. The reaction kettle is heated to 150 ℃ and is kept warm for 30 min.
4. And taking out the degradation product, ultrasonically cleaning the degradation product by using water, taking out the fiber and drying the fiber.
The carbon fiber was subjected to a monofilament tensile test according to ASTM-D3379, to obtain a monofilament tensile strength of 4.55GPa and a strength retention of 92.9%.

Claims (10)

1. A degradation solvent of carbon fiber resin matrix composite is characterized in that: the degradation solvent of the carbon fiber resin matrix composite material comprises the following components: phosphoric acid aqueous solution or sulfurous acid aqueous solution.
2. The degradation solvent for carbon fiber resin-based composite material according to claim 1, characterized in that: the degradation solvent also comprises hydrogen peroxide and benzyl bromide.
3. The degradation solvent for carbon fiber resin-based composite material according to claim 1, characterized in that: the concentration of the phosphoric acid aqueous solution or the sulfurous acid aqueous solution is 40-85%.
4. The degradation solvent for carbon fiber resin-based composite material according to claim 2, characterized in that: the concentration of the hydrogen peroxide is 0% -45%, and the concentration of the benzyl bromide is 0% -5%.
5. The degradation solvent for carbon fiber resin-based composite material according to claim 1, characterized in that: the matrix resin of the carbon fiber resin matrix composite material is thermosetting resin and comprises epoxy resin, bismaleimide resin, unsaturated polyester and phenolic resin.
6. The degradation solvent for carbon fiber resin-based composite material according to claim 1, characterized in that: the carbon fiber of the carbon fiber resin matrix composite material comprises: PAN-based carbon fibers and pitch-based carbon fibers.
7. The degradation solvent for carbon fiber resin-based composite material according to claim 1, characterized in that: the carbon fiber form of the carbon fiber resin matrix composite material comprises: continuous fibers, long fibers, chopped fibers, powdered fibers, and carbon fiber fabrics.
8. A method for recovering carbon fibers from a carbon fiber resin matrix composite material through catalytic pyrolysis is characterized by comprising the following steps: the method comprises the following steps: mixing the carbon fiber resin matrix composite material with a degradation solvent; reacting for 30-120 min at the temperature of 150-300 ℃; after the reaction is finished, taking out the degradation product of the composite material, ultrasonically cleaning the degradation product by using water, and drying the degradation product to obtain recovered carbon fibers; wherein the degradation solvent is: a mixed aqueous solution of phosphoric acid or sulfurous acid with a concentration of 40-85% and hydrogen peroxide with a concentration of 0-45%.
9. The method for recovering carbon fibers by catalytic pyrolysis of a carbon fiber resin-based composite material according to claim 8, characterized in that: the volume ratio of the carbon fiber resin-based composite material to the degradation solvent is less than or equal to 1:1 (V/V).
10. The method for recovering carbon fibers by catalytic pyrolysis of a carbon fiber resin-based composite material according to claim 8, characterized in that: the matrix resin of the carbon fiber resin matrix composite material is thermosetting resin and comprises epoxy resin, bismaleimide resin, unsaturated polyester and phenolic resin; the carbon fiber of the carbon fiber resin matrix composite material comprises: PAN-based carbon fibers and pitch-based carbon fibers; the carbon fiber form of the carbon fiber resin matrix composite material comprises: continuous fibers, long fibers, chopped fibers, powdered fibers, and carbon fiber fabrics.
CN201810964455.3A 2018-08-23 2018-08-23 Degradation solvent and degradation method for carbon fiber resin matrix composite material Pending CN110857341A (en)

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Citations (2)

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Publication number Priority date Publication date Assignee Title
CN105906836A (en) * 2016-05-09 2016-08-31 西北工业大学 Recovering method of carbon fiber reinforced resin matrix composite material under mild conditions
CN107082584A (en) * 2016-02-15 2017-08-22 山东理工大学 A kind of carbon fibre reinforced composite castoff regenerative carbon fiber method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107082584A (en) * 2016-02-15 2017-08-22 山东理工大学 A kind of carbon fibre reinforced composite castoff regenerative carbon fiber method
CN105906836A (en) * 2016-05-09 2016-08-31 西北工业大学 Recovering method of carbon fiber reinforced resin matrix composite material under mild conditions

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ZHANG WENQING: "Molecular simulation and experimental analysis on thermal and mechanical properties of carbon nanotube/epoxy resin composites with different curing agents at high-low temperature", 《POLYMER COMPOSITES》 *

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