Efficient degradation and regeneration method for resin-based composite material

Abstract

The invention discloses an efficient degradation and regeneration method for a resin-based composite material, and belongs to the field of solid waste material recovery. The method comprises the following steps: placing a resin-based composite material to be recycled in an irradiation environment of a gamma ray source, and heating for a period of time for physical aging to obtain a composite material 1; putting the composite material 1 in an aging solution for swelling to obtain a deeply aged composite material 2; and putting the composite material 2 into the mixed degradation liquid, and heating at normal pressure to obtain a fiber and active resin degradation product. In the degradation process of the resin-based composite material, gamma rays are firstly adopted for irradiation, and then swelling is conducted through an aging agent. Gamma rays can destroy C-O bonds and can further prevent recombination and crosslinking of the C-O bonds; the aging agent can increase the volume of the composite material in the solvent, so that the contact area of the composite material and the degradation liquid is increased, and the degradation efficiency of the composite material is further improved.

Description

Technical Field

[0001] The invention belongs to the field of solid waste material recovery, and in particular relates to a method for efficiently degrading and regenerating a resin-based composite material. Background Art

[0002] Resin-based composite materials (such as carbon fiber reinforced epoxy resin, polyaryletherketone-based materials, etc.) are widely used in aerospace, automobile, wind power and other fields due to their high strength and corrosion resistance. However, the waste generated by its production and scrapping is increasing year by year. For example, CFRP waste is expected to reach 170,000 tons by 2025. Resins (such as epoxy resins and phenolic resins) cannot be recycled by traditional melting methods due to the irreversible cross-linked network structure, making their waste treatment a pain point in the industry. Existing methods (such as mechanical crushing and pyrolysis) have problems such as loss of fiber performance and inability to reuse resins. Physical methods (mechanical crushing) lead to shortened fiber length, decreased performance, and low added value of recycled products. Pyrolysis (high temperature decomposition) requires a high temperature of more than 400°C, high energy consumption and resin carbonization, making it difficult to retain the original structure of the fiber. Most methods only recover a single component of fiber or resin, and cannot achieve high-value reuse of all components of composite materials.

[0003] CN119039659A provides a method and device for degrading epoxy resin. The epoxy resin degradation method includes the steps of raw material mixing, temperature degradation, filtering, evaporation, solvent recovery, etc., and defines that the epoxy resin is bisphenol A type epoxy resin; the epoxy resin is an anhydride cured epoxy resin; and the catalyst is an alkaline catalyst. By using a combination of alcohol solvent and alkaline catalyst, the degradation efficiency of epoxy resin is improved, and high-value materials such as metal or glass fiber in the resin matrix can be effectively recovered, so that the recycling of resources is realized and the processing cost of waste epoxy resin is reduced.

[0004] CN117209841A provides a method for degrading a resin-based composite material and preparing a sizing agent using the same. The resin-based composite material is immersed in concentrated sulfuric acid to generate an ionic liquid oxonium salt structure, the resin matrix is ​​liquefied, and the insoluble reinforcing filler or modified material is separated by filtration. An organic coupling agent is added to the obtained resin degradation liquid for modification, and then an extraction separation method is used to obtain a resin-based sizing agent; the obtained sizing agent can be used as a sizing agent or modifier for carbon fiber, glass fiber, basalt fiber, silicon carbide fiber products, and can also be used as a surface modifier or interface compatibility agent for other resin-based reinforcing fillers or modified materials.

[0005] CN112662008A provides a method for microwave degradation of epoxy resin. Epoxy resin, solvent and organic acid catalyst are prepared into a degradation system, and placed in a microwave reactor for degradation reaction. After the degradation is completed, an organic solvent is added to extract the epoxy resin degradation product, and the organic solvent is evaporated to obtain the epoxy resin degradation product; the raffinate phase is used to recover the obtained catalyst system and can be used for the next degradation reaction. It mainly solves the problems of high catalyst cost, high degradation reaction temperature, high pressure and harsh conditions existing in the current epoxy resin degradation method.

[0006] Although the above-mentioned known technologies all recycle resin-based composite materials through chemical recycling methods, there are still problems such as low degradation efficiency, recycling only a single component of fiber or resin, and being unable to achieve high-value reuse of all components of the composite material. Summary of the invention

[0007] The purpose of the present invention is to solve the problems of low degradation efficiency, recovery of only a single component of fiber or resin, and inability to achieve high-value reuse of all components of composite materials, and to provide a method for efficient degradation and regeneration of resin-based composite materials, thereby improving degradation efficiency and achieving recovery and re-preparation of high-value products.

[0008] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0009] A method for efficiently degrading a resin-based composite material, the method comprising:

[0010] Step 1: placing the resin-based composite material to be recycled in an irradiation environment of a gamma-ray source, and heating it for a period of time for physical aging to obtain a composite material 1;

[0011] Step 2: placing the composite material 1 in an aging solution to swell, thereby obtaining a deeply aged composite material 2;

[0012] Step 3: placing the composite material 2 in a mixed degradation liquid, heating the composite material 2 at normal pressure to degrade the composite material 2, and obtaining fiber and active resin degradation products.

[0013] Further, in step 1, the resin includes phenolic resin, epoxy resin, unsaturated polyester resin, polyurethane resin, melamine formaldehyde resin, polyetheretherketone, polyphenylene sulfide, polysulfone, acrylonitrile-butadiene-styrene copolymer, polymethyl methacrylate, thermoplastic polyurethane, polyamide, polycarbonate, polyoxymethylene, polyethylene terephthalate, polybutylene terephthalate, etc., which are commonly found on the market. The radiation intensity of the gamma-ray source is 30-80Co, and more preferably, the radiation intensity is 50-65Co; the temperature of the physical aging is 30-150°C, and the time is 0.1-72h. More preferably, the physical aging temperature is 80-120°C, and the time is 1-3h.

[0014] Furthermore, in step 2, the aging liquid is a polyester-nylon composite fiber aging liquid and / or nanofiber hydrogel, wherein the mass ratio of the aging liquid to the composite material 1 is 10:3-7; the nanofiber hydrogel is one or more of a composite hydrogel, a bacterial cellulose nanofiber composite hydrogel, a polylactic acid nanofiber composite hydrogel, an aramid nanofiber composite hydrogel and a polycaprolactone composite hydrogel. The polyester-nylon composite fiber aging liquid was purchased from Zhejiang Fuerpusheng New Materials Co., Ltd., model number

[0015] Furthermore, in step 2, the swelling time is 0.1 to 192 hours, more preferably, the swelling time is 3 to 36 hours.

[0016] Furthermore, in step three, the mixed degradation solution is a mixed solution of metal salt, strong base and solvent; the mass ratio of metal salt, strong base and solvent is 3-5:10:0.1-2.

[0017] Further, in step 3, the metal salt is one or more of nitrate, sulfate, chloride, phosphate, and acetate; the nitrate is one or more of sodium nitrate, potassium nitrate, ammonium nitrate, calcium nitrate, lead nitrate, and cerium nitrate; the sulfate is one or more of ferric sulfate, copper sulfate, sodium sulfate, potassium sulfate, potassium aluminum sulfate, sodium sulfate, magnesium sulfate, and aluminum sulfate; the chloride is one or more of sodium chloride, potassium chloride, calcium chloride, magnesium chloride, zinc chloride, ferrous chloride, ferric chloride, copper chloride, silver chloride, barium chloride, ammonium chloride, and aluminum chloride; the phosphate is one or more of iron phosphate, copper phosphate, sodium phosphate, potassium phosphate, and magnesium phosphate; the acetate is one or more of ferric acetate, copper acetate, sodium acetate, potassium acetate, and magnesium acetate; preferably, the metal salt comprises Contains one or two of sodium sulfate, potassium sulfate, and potassium chloride; the strong base is one or more of triethylamine, hexamethylenetetramine, ethylenediamine, propylenediamine, butylenediamine, o-phenylenediamine, m-phenylenediamine, p-phenylenediamine, pyridine, imidazole, piperidine, sodium amide, sodium sulfide, sodium fluoride, potassium fluoride, ammonia water, sodium hydroxide, potassium hydroxide, calcium hydroxide, barium hydroxide, sodium methoxide, sodium ethoxide, n-butyllithium, and methyllithium; the solvent is one or more of dimethyl sulfoxide, N,N-dimethylformamide, benzyl alcohol, phenylethyl alcohol, n-hexanol, 1,3-propylene glycol, glycerol, fructose, pentaerythritol, 1,2-propylene glycol (1,2-PG), 1,4-butanediol (BDO), 1,6-hexanediol (HD), neopentyl glycol, ethylene glycol, tetramethylbenzyl alcohol, ethyl acetate, isopropanol, and phenylethyl alcohol.

[0018] Furthermore, in step 3, the heating temperature is 50-200°C and maintained for 0.1-12h; preferably, the temperature is 120-180°C and the time is 0.3-2h. The mass of the composite material 2 / (the total mass of the composite material 2 and the degradation liquid) is 1%-70%, preferably 30%-50%.

[0019] A method for remanufacturing resin, the method comprising: heating and mixing a curing material, a resin and a resin curing accelerator, degassing and then curing to obtain a remanufactured resin;

[0020] The solidified material includes active resin degradation products;

[0021] The resin is a well-known commercial resin;

[0022] The resin curing accelerator is a salt compound of a tertiary amine compound, preferably trioleate of 2,4,6-tris(dimethylaminomethyl)phenol and / or tri-(2-ethylhexanoate) of 2,4,6-tris(dimethylaminomethyl)phenol.

[0023] The mass percentage of the curing material is 20% to 80%, preferably 30% to 50%; the mass percentage of the resin curing accelerator is 1% to 5%, preferably 2% to 4%; and the remainder is epoxy resin.

[0024] A remanufactured resin composite material, the remanufactured resin and toughening material are heated and pressurized for vulcanization, the pressure is 3-15MPa, the temperature is 100-230°C, and the time is 1-3h.

[0025] Furthermore, the toughening material is the fiber obtained above; the mass of the toughening material is 30% to 65%, preferably 40% to 60% of the mass of the remanufactured resin.

[0026] The beneficial effects of the present invention compared to the prior art are:

[0027] (1) In the degradation process of the resin-based composite material of the present invention, γ-rays are first used for irradiation, and then swelling is carried out by an aging agent. γ-rays can destroy CO / CN bonds and further prevent their recombination and cross-linking; while the aging agent can increase the volume of the composite material in the solvent, increase the contact area between the composite material and the degradation liquid, and further improve the degradation efficiency of the composite material.

[0028] (2) The resin-based composite material of the present invention uses metal salts, strong bases and solvents to cooperate with each other. The metal salt coordinates with O to weaken the CO bond, promote the breakage of the resin long chain, and further improve the degradation efficiency of the composite material.

[0029] (3) The degradation products of the active resin obtained by degradation of the resin-based composite material of the present invention are rich in hydroxyl groups and amino groups, and can be used as a curing agent to promote the regeneration of epoxy resin and improve the recycling of the degradation products of the composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is the degradation time diagram of resin-based composite materials at different temperatures;

[0031] Figure 2 is the SEM image of the fiber after degradation;

[0032] Figure 3 is the stress-strain curve of a single glass fiber after degradation by degradation liquid;

[0033] Figure 4 is the Fourier transform infrared spectrum of the resin product after degradation by the degradation liquid;

[0034] Figure 5 is the DSC curve of the remanufactured resin;

[0035] Figure 6 It is the TG curve of the remanufactured resin. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the embodiments of the specification.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0039] The reagents described in the examples of the present invention were purchased from Aladdin Biochemical Technology Co., Ltd.

[0040] The method for measuring the performance in the embodiment of the present invention is as follows:

[0041] The mechanical properties (including tensile strength, elongation at break, and modulus) were measured by a universal tensile testing machine; the DSC and TG curves were measured by a DSC-TG thermal analyzer; and the thermogravimetric curve was measured by a thermogravimetric analyzer.

[0042] Example 1

[0043] A highly efficient degradation and regeneration method for resin-based composite materials is specifically as follows:

[0044] The epoxy resin-based composite material to be recycled is placed in an irradiation environment of a 50Co gamma ray source, and the temperature is raised to 80°C, maintained for 1 hour, and physically aged to obtain a composite material 1; then the composite material 1 is placed in a polyester-nylon composite fiber aging solution for swelling for 3 hours, the composite material 1 is 30% of the mass of the aging solution, and a deeply aged composite material 2 is obtained, and the solvent of the aging solution is a 1-10wt.% NaCl solution; the composite material 2 is placed in a mixed degradation solution of sodium nitrate, triethylamine and dimethyl sulfoxide in a mass ratio of 2:2:125, the composite material 2 is 30% of the mass of the degradation solution, and heated to 120°C at normal pressure and maintained for 0.3 hours to degrade the composite material to obtain fiber and active resin degradation products, the strength of the degraded fiber is 2.93GPa, and the active resin contains a large amount of hydroxyl and amino groups in the infrared spectrum.

[0045] The degradation product of active resin, epoxy resin and trioleate of epoxy resin curing accelerator 2,4,6-tris(dimethylaminomethyl)phenol were heated and mixed in a mass ratio of 3:10:0.1, degassed and cured to obtain remanufactured resin. After testing, the DSC temperature was 121.18°C and the Tg was 346°C. The remanufactured resin and degraded fiber were mixed in a mass ratio of 10:4, and placed in a flat vulcanizer at 200°C for 2 hours to obtain a remanufactured resin-based composite material.

[0046] from Figure 1 It can be seen that as the temperature increases, the degradation time gradually decreases and then tends to be flat, indicating that increasing the temperature can increase the degradation rate; Figure 2 This is the SEM image of the degraded fiber. The fiber surface is smooth and free of impurities, indicating that the degradation system can completely degrade the composite material. Figure 3 is the tensile stress-strain curve of a single fiber. The tensile value of a single fiber is 2.93 GPa, indicating that the degradation system will not damage the mechanical properties of the fiber; Figure 4 The infrared spectrum is shown in the figure at 3200cm -1 There is a strong absorption peak at , indicating that the active degradation resin contains a large number of hydroxyl groups and amino groups; Figure 5 The Tg curve of the remanufactured resin shows a Tg curve of 121°C, indicating that the active degradation material can completely cure the resin and has good thermal stability; Figure 6 The DSC curve of the remanufacturing resin shows that the thermal decomposition temperature of the resin is as high as 346°C, and it has good thermal stability.

[0047] Example 2

[0048] A highly efficient degradation and regeneration method for resin-based composite materials is specifically as follows:

[0049] The unsaturated polyester resin-based composite material to be recycled is placed in an irradiation environment of a 65Co gamma ray source, and the temperature is raised to 120°C and maintained for 3 hours for physical aging to obtain a composite material 1; the composite material 1 is then placed in a bacterial cellulose nanofiber composite hydrogel for swelling for 36 hours, the composite material 1 being 30% of the mass of the aging liquid, to obtain a deeply aged composite material 2; the composite material 2 is placed in a mixed degradation liquid of sodium chloride, sodium hydroxide and ethylene glycol in a mass ratio of 3:3:120, the composite material 2 being 50% of the mass of the degradation liquid, and heated to 180°C at normal pressure for 2 hours to degrade the composite material to obtain fiber and active resin degradation products, the fiber strength after degradation is 2.89 GPa, and the active degradation resin is tested by infrared spectrum at the same time, and the result is the same as in Example 1.

[0050] The degradation product of active resin, epoxy resin E51 and trioleate of epoxy resin curing accelerator 2,4,6-tris(dimethylaminomethyl)phenol were heated and mixed in a mass ratio of 3:10:0.1, degassed and cured to obtain remanufactured resin. After testing, the DSC temperature was 116°C and the Tg was 310°C. The remanufactured epoxy resin and degraded fiber were mixed in a mass ratio of 10:4, placed in a flat vulcanizer, and maintained at 200°C for 2 hours to obtain a remanufactured resin composite material.

[0051] Example 3

[0052] A highly efficient degradation and regeneration method for resin-based composite materials is specifically as follows:

[0053] The phenolic resin-based composite material to be recycled is placed in an irradiation environment of a 55Co gamma ray source, and the temperature is raised to 100°C and maintained for 2 hours for physical aging to obtain a composite material 1; then the composite material 1 is placed in a polylactic acid nanofiber composite hydrogel for swelling for 3 hours, the composite material 1 being 50% of the mass of the aging liquid, to obtain a deeply aged composite material 2; the composite material 2 is placed in a mixed degradation liquid of sodium chloride, sodium amide and ethylene glycol in a mass ratio of 2:2:125, the composite material 2 being 70% of the mass of the degradation liquid, and heated to 120°C at normal pressure for 1 hour to degrade the composite material to obtain fiber and active resin degradation products, the fiber strength after degradation is 2.91 GPa, and the active degradation resin is tested by infrared spectrum at the same time, and the result is the same as in Example 1.

[0054] The degradation product of active resin, epoxy resin E51 and trioleate of epoxy resin curing accelerator 2,4,6-tris(dimethylaminomethyl)phenol were heated and mixed in a mass ratio of 3:10:0.1, degassed and cured to obtain remanufactured epoxy resin; after testing, the DSC temperature was 136°C and the Tg was 315°C; the remanufactured epoxy resin and degraded fiber were mixed in a mass ratio of 10:4, placed in a flat vulcanizer, maintained at 200°C for 2 hours, to obtain a remanufactured resin composite material.

[0055] Example 4

[0056] A highly efficient degradation and regeneration method for resin-based composite materials is specifically as follows:

[0057] The phenolic resin-based composite material to be recycled is placed in an irradiation environment of a 30Co gamma ray source, and the temperature is raised to 300°C and maintained for 0.1h for physical aging to obtain a composite material 1; the composite material 1 is then placed in an aramid nanofiber composite hydrogel for swelling for 0.1h, wherein the composite material 1 accounts for 30% of the mass of the aging liquid, to obtain a deeply aged composite material 2; the composite material 2 is placed in a mixed degradation liquid of cerium nitrate, sodium sulfate and ethyl acetate in a mass ratio of 2:2:125, wherein the composite material 2 accounts for 10% of the mass of the degradation liquid, and the composite material is heated to 50°C at normal pressure and maintained for 0.1h to degrade the composite material to obtain fiber and active resin degradation products, wherein the strength of the degraded fiber is 2.95GPa, and an infrared spectrum test is performed on the active degradation resin at the same time, and the result is the same as in Example 1.

[0058] The degradation product of active resin, phenolic resin and trioleate of resin curing accelerator 2,4,6-tris(dimethylaminomethyl)phenol are heated and mixed in a mass ratio of 3:10:0.1, degassed and then cured to obtain remanufactured phenolic resin; after testing, the DSC temperature is 132°C and the Tg is 311°C; the remanufactured phenolic resin and degraded fiber are mixed in a mass ratio of 10:4, and placed in a flat vulcanizer at 200°C for 2 hours to obtain a remanufactured resin-based composite material.

[0059] Example 5

[0060] A highly efficient degradation and regeneration method for resin-based composite materials is specifically as follows:

[0061] The resin-based composite material to be recycled is placed in an irradiation environment of an 80Co gamma ray source, and the temperature is raised to 150°C and maintained for 72 hours for physical aging to obtain a composite material 1; then the composite material 1 is placed in a polycaprolactone composite hydrogel aging solution for swelling for 192 hours, wherein the composite material 1 accounts for 30% of the mass of the aging solution, to obtain a deeply aged composite material 2; the composite material 2 is placed in a mixed degradation solution of sodium acetate, sodium sulfide and propylene glycol in a mass ratio of 2:2:125, wherein the composite material 2 accounts for 70% of the mass of the degradation solution, and the composite material is heated to 200°C at normal pressure and maintained for 12 hours to degrade the composite material to obtain fiber and active resin degradation products, wherein the strength of the degraded fiber is 2.92 GPa, and an infrared spectrum test is performed on the active degradation resin at the same time, and the result is the same as in Example 1.

[0062] The degradation product of active resin, unsaturated resin and trioleate of resin curing accelerator 2,4,6-tris(dimethylaminomethyl)phenol are heated and mixed in a mass ratio of 3:10:0.1, degassed and cured to obtain remanufactured unsaturated resin; after testing, the DSC temperature is 132°C and the Tg is 311°C; the remanufactured unsaturated resin and degraded fiber are mixed in a mass ratio of 10:4, and placed in a flat vulcanizer at 200°C for 2 hours to obtain a remanufactured resin-based composite material.

[0063] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A method for efficient degradation of resin-based composite materials, characterized in that: The method is: Step 1: placing the resin-based composite material to be recycled in an irradiation environment of a gamma-ray source, and heating it for a period of time for physical aging to obtain a composite material 1; Step 2: placing the composite material 1 in an aging solution to swell, thereby obtaining a deeply aged composite material 2; Step 3: placing the composite material 2 in a mixed degradation liquid and heating it at normal pressure to obtain fiber and active resin degradation products.

2. The method for efficient degradation of a resin-based composite material according to claim 1, characterized in that: In step one, the resin includes epoxy resin, phenolic resin, unsaturated polyester resin, polyurethane resin, melamine formaldehyde resin, polyetheretherketone, polyphenylene sulfide, polysulfone, acrylonitrile-butadiene-styrene copolymer, polymethyl methacrylate, thermoplastic polyurethane, polyamide, polycarbonate, polyformaldehyde, polyethylene terephthalate, polybutylene terephthalate, the radiation intensity of the gamma-ray source is 30-80Co, the temperature of the physical aging is 30-150°C, and the time is 0.1-72h.

3. The method for efficient degradation of a resin-based composite material according to claim 1, characterized in that: In step 2, the aging liquid is polyester-nylon composite fiber aging liquid and / or nanofiber hydrogel, wherein the mass ratio of the aging liquid to the composite material 1 is 10:3-7; the nanofiber hydrogel is one or more of a composite hydrogel, a bacterial cellulose nanofiber composite hydrogel, a polylactic acid nanofiber composite hydrogel, an aramid nanofiber composite hydrogel and a polycaprolactone composite hydrogel.

4. The method for efficient degradation of a resin-based composite material according to claim 1, characterized in that: In step 2, the swelling time is 0.1 to 192 hours.

5. The method for efficient degradation of a resin-based composite material according to claim 1, characterized in that: In step three, the mixed degradation solution is a mixed solution of metal salt, strong base and solvent; the mass ratio of metal salt, strong base and solvent is 3-5:10:0.1-2.

6. The method for efficient degradation of a resin-based composite material according to claim 5, characterized in that: In step 3, the metal salt is one or more of nitrate, sulfate, chloride, phosphate, and acetate; the nitrate is one or more of sodium nitrate, potassium nitrate, ammonium nitrate, calcium nitrate, lead nitrate, and cerium nitrate; the sulfate is one or more of ferric sulfate, copper sulfate, sodium sulfate, potassium sulfate, potassium aluminum sulfate, sodium sulfate, magnesium sulfate, and aluminum sulfate; the chloride is one or more of sodium chloride, potassium chloride, calcium chloride, magnesium chloride, zinc chloride, ferrous chloride, ferric chloride, copper chloride, silver chloride, barium chloride, ammonium chloride, and aluminum chloride; the phosphate is one or more of ferric phosphate, copper phosphate, sodium phosphate, potassium phosphate, and magnesium phosphate; the acetate is one or more of ferric acetate, copper acetate, sodium acetate, potassium acetate, and magnesium acetate; preferably, The metal salt comprises one or two of sodium sulfate, potassium sulfate and potassium chloride; the strong base is one or more of triethylamine, hexamethylenetetramine, ethylenediamine, propylenediamine, butylenediamine, o-phenylenediamine, m-phenylenediamine, p-phenylenediamine, pyridine, imidazole, piperidine, sodium amide, sodium sulfide, sodium fluoride, potassium fluoride, ammonia water, sodium hydroxide, potassium hydroxide, calcium hydroxide, barium hydroxide, sodium methoxide, sodium ethoxide, n-butyllithium and methyllithium; the solvent is one or more of dimethyl sulfoxide, N,N-dimethylformamide, benzyl alcohol, phenylethyl alcohol, n-hexanol, 1,3-propylene glycol, glycerol, fructose, pentaerythritol, 1,2-propylene glycol, 1,4-butylene glycol, 1,6-hexanediol, neopentyl glycol, ethylene glycol, tetramethylbenzyl alcohol, ethyl acetate, isopropanol and phenylethyl alcohol.

7. The method for efficient degradation of a resin-based composite material according to claim 1, characterized in that: In step three, the heating temperature is 50-200° C. and maintained for 0.1-12 hours; the mass of the composite material 2 / (the total mass of the composite material 2 and the degradation liquid) is 1%-70%.

8. A method for remanufacturing resin, characterized in that: The method comprises: heating and mixing a curing material, a resin and a resin curing accelerator, degassing and curing the material to obtain a remanufactured resin; The solidified material includes active resin degradation products; The resin curing accelerator is a salt compound of a tertiary amine compound, preferably trioleate of 2,4,6-tris(dimethylaminomethyl)phenol and / or tri-(2-ethylhexanoate) of 2,4,6-tris(dimethylaminomethyl)phenol; The mass percentage of the curing material is 20% to 80%, the mass percentage of the resin curing accelerator is 1% to 5%, and the balance is resin.

9. A remanufactured resin-based composite material, characterized in that: The remanufactured resin and toughened material obtained in claim 8 are heated and pressurized for vulcanization at a pressure of 3 to 15 MPa, a temperature of 100 to 230° C., and a time of 1 to 3 hours.

10. The remanufactured resin-based composite material according to claim 9, characterized in that: The toughening material is the fiber obtained according to claim 1; the mass of the toughening material is 30% to 65% of the mass of the remanufactured resin.

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