Hyperbranched ionic liquid for manufacturing carbon fiber composite material and preparation method thereof

Abstract

The invention discloses a hyperbranched ionic liquid for manufacturing a carbon fiber composite material and a manufacturing method thereof, by means of the hyperbranched ionic liquid provided by the invention, the degradable and recyclable carbon fiber composite material can be prepared, and meanwhile, the interface bonding strength of the carbon fiber composite material is improved; and the technical problem that the performance of the carbon fiber reinforced epoxy resin composite material is difficult to improve and recover is synchronously solved. The hyperbranched ionic liquid provided by the invention has the advantages of simple preparation process and easily available raw materials, is especially suitable for industrial production, and provides a new solution for green and sustainable development of carbon fiber composite materials.

Description

Technical Field

[0001] This invention belongs to the field of carbon fiber composite material technology, specifically relating to hyperbranched ionic liquids used in the manufacture of carbon fiber composite materials and their preparation methods. Background Technology

[0002] Lightweight and high-strength carbon fiber reinforced epoxy resin (CFRP) composites are advantageous materials for achieving economic restructuring, energy conservation, emission reduction, and green development, characterized by high strength, light weight, ease of manufacturing, and heat and corrosion resistance. Lightweight and high-strength CFRP has enormous development potential in wind turbine blades and new energy vehicles, effectively addressing the challenge of balancing density, strength, modulus, and fatigue resistance in long blade materials under high wind conditions, as well as the issue of low vehicle range in battery systems. Hyperbranched polymers possess numerous internal cavities and end groups, resulting in high reactivity. Due to less intermolecular entanglement, hyperbranched polymers are less prone to crystallization and exhibit good hydrodynamic properties, unique viscosity behavior, and easy film formation, making them suitable for reinforcing and toughening bisphenol A type epoxy resins.

[0003] However, CFRP forms a three-dimensional irreversible cross-linked network structure during the curing process, making its recycling and reprocessing difficult. This leads to a large accumulation of CFRP waste, occupying significant land and polluting the environment, thus becoming a major obstacle to the sustainable development of carbon fiber composites. Meanwhile, interfacial bonding strength is also a key factor affecting the comprehensive mechanical properties of carbon fiber reinforced epoxy resin composites. Improving the surface inertness of carbon fibers and enhancing their bonding strength with the resin is of significant research importance and value. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a hyperbranched ionic liquid for manufacturing carbon fiber composite materials and its preparation method. With the hyperbranched ionic liquid provided by this invention, degradable and recyclable carbon fiber composite materials can be prepared, while simultaneously improving the interfacial bonding strength of carbon fiber composite materials. This solves the technical challenges of interfacial reinforcement and recycling difficulties in carbon fiber reinforced epoxy resin composite materials.

[0005] To achieve the objectives of this invention, a first aspect of this invention provides a hyperbranched ionic liquid for manufacturing carbon fiber composite materials. The hyperbranched ionic liquid is obtained by reacting a terminal thiol hyperbranched polymer containing a hexahydrotriazine structure with an allyl ionic liquid via a thiol-olefin click reaction. The number-average molecular weight of the hyperbranched ionic liquid is 2000-23000 g / mol. The structural formula of the terminal thiol hyperbranched polymer containing the hexahydrotriazine structure is formula (1), formula (2), formula (3), or formula (4). Equation (1) Equation (2), Equation (3) Equation (4); The structure of R1 is as follows: R2 is one or more of the following structures: , , , , .

[0006] Furthermore, the hyperbranched ionic liquid is obtained by a thiol-olefin click reaction under ultraviolet light irradiation using a terminal thiol hyperbranched polymer containing a hexahydrotriazine structure, an allyl ionic liquid, and a photoinitiator; the molar ratio of the terminal thiol hyperbranched polymer containing a hexahydrotriazine structure to the allyl ionic liquid is 1:1, and the mass ratio of the terminal thiol hyperbranched polymer containing a hexahydrotriazine structure to the photoinitiator is 100:(0.1-2.0).

[0007] Furthermore, the allyl ionic liquid is one or more of 1-allyl-3-methylimidazolium chloride, 1-allyl-3-methylimidazolium bromide, 1-allyl-3-methylimidazolium tetrafluoroborate, 1-allyl-3-methylimidazolium hexafluorophosphate, and 1-allyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide; the photoinitiator is one or more of 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone, 1-hydroxycyclohexylphenyl ketone, benzoyl isopropanol, 1-hydroxy-1-methylethylphenyl ketone, and (2,4,6-trimethylbenzoyl)diphenylphosphine oxide.

[0008] Furthermore, the terminal thiol hyperbranched polymer containing the hexahydrotriazine structure is obtained by reacting trithiohexahydrotriazine with a diisocyanate monomer, wherein the mass ratio of the trithiohexahydrotriazine to the isocyanate monomer is 100:(30-59).

[0009] Secondly, the present invention provides a method for manufacturing a hyperbranched ionic liquid for manufacturing carbon fiber composite materials, comprising the following steps: (1) The terminal thiol hyperbranched polymer containing a hexahydrotriazine structure, the allyl ionic liquid and the photoinitiator are uniformly mixed; the molar ratio of the terminal thiol hyperbranched polymer containing a hexahydrotriazine structure to the allyl ionic liquid is 1:1, and the mass ratio of the terminal thiol hyperbranched polymer containing a hexahydrotriazine structure to the photoinitiator is 100:(0.1-2.0). (2) Under ultraviolet light irradiation, a hyperbranched ionic liquid is obtained by a thiol-olefin click reaction for 5-10 minutes.

[0010] Furthermore, the method for manufacturing a terminal thiol hyperbranched polymer containing a hexahydrotriazine structure includes the following steps: Trithiohexahydrotriazine, diisocyanate monomer, and solvent are mixed evenly and stirred at 0-20℃ for 1-2 hours to obtain a terminal thiol hyperbranched polymer containing a hexahydrotriazine structure. The diisocyanate monomer is one or more of hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), 4,4'-methylenebis(phenyl isocyanate) (MDI), and toluene diisocyanate (TDI). The solvent is one or more of tetrahydrofuran, acetone, N,N-dimethylformamide, and chloroform. The mass ratio of trithiohexahydrotriazine to isocyanate monomer is 100:(30-59), and the mass ratio of the reactant trithiohexahydrotriazine monomer to solvent is 1:(5-20).

[0011] Thirdly, this invention provides a method for using hyperbranched ionic liquids in the manufacture of carbon fiber composite materials, comprising the following steps: A. The hyperbranched ionic liquid, bisphenol A type epoxy resin and curing agent are uniformly mixed to obtain a hyperbranched ionic mixed liquid. The mass ratio of bisphenol A type epoxy resin, hyperbranched ionic liquid and curing agent is 100:(0.1-10):(10-30). B. After thoroughly impregnating the carbon fiber cloth with the hyperbranched ion mixed liquid, place it in a mold for lamination and thermosetting to obtain a carbon fiber reinforced composite material.

[0012] Furthermore, step C is included: the carbon fiber reinforced composite material obtained in step B is degraded in a tetrahydrofuran solution of 0.1-2.0 mol / L phosphoric acid, and the carbon fiber cloth obtained by degradation is washed with ethanol to obtain recyclable carbon fiber cloth.

[0013] Furthermore, the recyclable carbon fiber cloth obtained in step C can replace the carbon fiber cloth in step B. It can be laminated and thermocured using the manufacturing method in step B to obtain a recyclable carbon fiber reinforced composite material.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The preparation process of the hyperbranched ionic liquid of the present invention is simple, the reaction conditions are mild, it can be prepared under conventional reaction conditions, the raw materials are readily available, and it is suitable for industrial production.

[0015] 2. The hyperbranched ionic liquid of the present invention has the function of reinforcing and toughening epoxy resin, which can effectively improve the comprehensive performance of epoxy resin, especially improve the interfacial strength of carbon fiber reinforced composite material and enhance its shear resistance.

[0016] 3. When the hyperbranched ionic liquid of the present invention is used to manufacture carbon fiber composite materials, it can realize the biodegradability of carbon fiber composite materials. The recycled carbon fibers can be reused, and the recycled carbon fibers can be used to manufacture recyclable carbon fiber reinforced composite materials while still maintaining good material properties. Attached Figure Description

[0017] The disclosure of this invention will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are merely illustrative of the technical solutions of this invention and are not intended to limit the scope of protection of this invention.

[0018] Figure 1 This is a schematic diagram of the process for manufacturing recyclable carbon fiber reinforced composite materials using hyperbranched ionic liquids provided by the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods.

[0020] Figure 1 This is a schematic diagram of the process for manufacturing recyclable carbon fiber reinforced composite materials using hyperbranched ionic liquids provided by the present invention. Figure 1 The process described in this embodiment of the invention specifically illustrates the process flow for preparing carbon fiber composite materials using hyperbranched ionic liquids, and how to degrade and reuse the prepared carbon fiber composite materials.

[0021] Example 1 (1) 16.46g of trithiodimethylhexahydrotriazine, 5.05g of hexamethylene diisocyanate and 160g of tetrahydrofuran were mixed evenly and stirred at 0 °C for 2h to obtain THBP-1, a terminal thiol hyperbranched polymer containing a hexahydrotriazine structure. Each mole of THBP-1 contains 6 mol of hydroxyl groups and has a number average molecular weight of 2148g / mol.

[0022] (2) 2.14 g of THBP-1, 1.61 g of 1-allyl-3-methylimidazolium hexafluorophosphate AMIMPF6, and 0.03 g of photoinitiator 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone were mixed in a uniform ratio. After mixing, the mixture was irradiated with ultraviolet light for 5 min (wavelength 365 nm, light source power 2 kW, power density 80 W / cm) to obtain hyperbranched ionic liquid THBP-AMIMPF6-1 with a number average molecular weight of 3757 g / mol.

[0023] (3) Mix 0.03g of THBP-AMIMPF6-1, 10g of bisphenol A type epoxy resin and 2.21g of isoflurane diamine according to the ratio. After mixing thoroughly, pour into a mold sprayed with release agent and cure at 120℃ for 2h to obtain hyperbranched ionic liquid toughened epoxy resin. Its tensile strength is shown in Table 1.

[0024] (4) Mix 0.03g of THBP-AMIMPF6-1, 10g of bisphenol A epoxy resin and 2.21g of isoflurane diamine according to the ratio. After the mixture is fully impregnated with carbon fiber cloth (carbon fiber grade T800), it is placed in a mold coated with release agent for lamination. It is then hot-pressed and cured at 120℃ for 2h under 10MPa. After hot pressing, it is cold-pressed at 10MPa for 10min and then taken out to obtain carbon fiber reinforced epoxy resin composite material. Its tensile strength is shown in Table 2.

[0025] (5) The carbon fiber reinforced epoxy resin composite material with a size of 10mm×10mm×4mm was immersed in a 1.0mol / L tetrahydrofuran solution of phosphoric acid for degradation. The degradation temperature was 25℃ and the degradation time was 3h. The fiber cloth obtained by degradation was rinsed with ethanol and placed at 60℃ for 2h to obtain recycled carbon fiber cloth.

[0026] (6) Replace the carbon fiber cloth in step (4) with the recycled carbon fiber cloth in step (5) and obtain the recyclable carbon fiber reinforced epoxy resin composite material according to the preparation process in step (4). Its tensile strength is shown in Table 2.

[0027] Example 2 (1) 12.34g of trithiodimethylhexahydrotriazine, 4.54g of hexamethylene diisocyanate and 120g of tetrahydrofuran were mixed evenly and stirred at 10 °C for 1.5h to obtain THBP-2, a terminal thiol hyperbranched polymer containing a hexahydrotriazine structure. Each mole of THBP-2 contains 12mol of hydroxyl groups and has a number average molecular weight of 5626g / mol.

[0028] (2) 5.62 g of THBP-2, 3.22 g of 1-allyl-3-methylimidazolium hexafluorophosphate AMIMPF6, and 0.09 g of photoinitiator 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone were mixed in a specific ratio. After the mixture was homogeneous, it was irradiated with ultraviolet light for 5 min (wavelength 365 nm, light source power 2 kW, power density 80 W / cm) to obtain the hyperbranched ionic liquid THBP-AMIMPF6-2 with a number average molecular weight of 8843 g / mol.

[0029] (3) Mix 0.05g of THBP-AMIMPF6-2, 10g of bisphenol A type epoxy resin and 2.21g of isoflurane diamine according to the ratio. After mixing thoroughly, pour into a mold sprayed with release agent and cure at 120℃ for 2h to obtain hyperbranched ionic liquid toughened epoxy resin. Its tensile strength is shown in Table 1.

[0030] (4) Mix 0.05g of THBP-AMIMPF6-2, 10g of bisphenol A epoxy resin and 2.21g of isoflurane diamine according to the ratio. After the mixture is fully impregnated with carbon fiber cloth (carbon fiber grade T800), it is placed in a mold coated with release agent for lamination. It is then hot-pressed and cured at 120℃ for 2h under 10MPa. After hot pressing, it is cold-pressed at 10MPa for 10min and then taken out to obtain carbon fiber reinforced epoxy resin composite material. Its tensile strength is shown in Table 2.

[0031] (5) The carbon fiber reinforced epoxy resin composite material with a size of 10mm×10mm×4mm was immersed in a 1.0mol / L tetrahydrofuran solution of phosphoric acid for degradation. The degradation temperature was 25℃ and the degradation time was 3h. The fiber cloth obtained by degradation was rinsed with ethanol and placed at 60℃ for 2h to obtain recycled carbon fiber cloth.

[0032] (6) Replace the carbon fiber cloth in step (4) with the recycled carbon fiber cloth in step (5) and obtain the recyclable carbon fiber reinforced epoxy resin composite material according to the preparation process in step (4). Its tensile strength is shown in Table 2.

[0033] Example 3 (1) 13.58g of trithiodimethylhexahydrotriazine, 5.30g of hexamethylene diisocyanate and 100g of tetrahydrofuran were mixed evenly and stirred at 0 °C for 2h to obtain THBP-3, a terminal thiol hyperbranched polymer containing a hexahydrotriazine structure. Each mole of THBP-3 contains 24mol of hydroxyl groups and has a number-average molecular weight of 16056g / mol.

[0034] (2) 16.05 g of THBP-3, 6.44 g of 1-allyl-3-methylimidazolium hexafluorophosphate AMIMPF6, and 0.02 g of photoinitiator 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone were mixed in a uniform ratio. After mixing, the mixture was irradiated with ultraviolet light for 5 min (wavelength 365 nm, light source power 2 kW, power density 80 W / cm) to obtain the hyperbranched ionic liquid THBP-AMIMPF6-3 with a number average molecular weight of 22491 g / mol.

[0035] (3) Mix 0.1g of THBP-AMIMPF6-3, 10g of bisphenol A type epoxy resin and 2.21g of isoflurane diamine according to the ratio. After thorough mixing, pour into a mold sprayed with release agent and cure at 120℃ for 2h to obtain hyperbranched ionic liquid toughened epoxy resin. Its tensile strength is shown in Table 1.

[0036] (4) Mix 0.1g of THBP-AMIMPF6-3, 10g of bisphenol A epoxy resin and 2.21g of isoflurane diamine according to the ratio. After the mixture is fully impregnated with carbon fiber cloth (carbon fiber grade T800), it is placed in a mold coated with release agent for lamination. It is then hot-pressed and cured at 120℃ for 2h under 10MPa. After hot pressing, it is cold-pressed at 10MPa for 10min and then taken out to obtain carbon fiber reinforced epoxy resin composite material. Its tensile strength is shown in Table 2.

[0037] (5) The carbon fiber reinforced epoxy resin composite material with a size of 10mm×10mm×4mm was immersed in a 1.0mol / L tetrahydrofuran solution of phosphoric acid for degradation. The degradation temperature was 25℃ and the degradation time was 3h. The fiber cloth obtained by degradation was rinsed with ethanol and placed at 60℃ for 2h to obtain recycled carbon fiber cloth.

[0038] (6) Replace the carbon fiber cloth in step (4) with the recycled carbon fiber cloth in step (5) and obtain the recyclable carbon fiber reinforced epoxy resin composite material according to the preparation process in step (4). Its tensile strength is shown in Table 2.

[0039] Example 4 (1) 16.46g of trithiodimethylhexahydrotriazine, 6.66g of isophorone diisocyanate and 230g of tetrahydrofuran were mixed evenly and stirred at 20 °C for 1h to obtain THBP-4, a terminal thiol hyperbranched polymer containing a hexahydrotriazine structure. Each mole of THBP-4 contains 6 mol of hydroxyl groups and has a number average molecular weight of 2310g / mol.

[0040] (2) 2.31 g of THBP-4, 1.61 g of 1-allyl-3-methylimidazolium bromide AMIMBr, and 0.03 g of photoinitiator 1-hydroxycyclohexylphenyl ketone were mixed in a specific ratio. After the mixture was homogeneous, it was irradiated with ultraviolet light for 7 min (wavelength 365 nm, light source power 2 kW, power density 80 W / cm) to obtain the hyperbranched ionic liquid THBP-AMIMBr-4 with a number average molecular weight of 3528 g / mol.

[0041] (3) Mix 0.05g of THBP-AMIMBr-4, 10g of bisphenol A epoxy resin and 2.21g of isoflurane diamine according to the ratio. After mixing thoroughly, pour the mixture into a mold sprayed with release agent and cure at 120℃ for 2h to obtain hyperbranched ionic liquid toughened epoxy resin. Its tensile strength is shown in Table 1.

[0042] (4) Mix 0.05g of THBP-AMIMBr-4, 10g of bisphenol A epoxy resin and 2.21g of isoflurane diamine according to the ratio. After the mixture is fully impregnated with carbon fiber cloth (carbon fiber grade T800), it is placed in a mold coated with release agent for lamination. It is then hot-pressed and cured at 120℃ for 2h under 10MPa. After hot pressing, it is cold-pressed at 10MPa for 10min and then taken out to obtain carbon fiber reinforced epoxy resin composite material. Its tensile strength is shown in Table 2.

[0043] (5) The carbon fiber reinforced epoxy resin composite material with a size of 10mm×10mm×4mm was immersed in a 1.0mol / L tetrahydrofuran solution of phosphoric acid for degradation. The degradation temperature was 25℃ and the degradation time was 3h. The fiber cloth obtained by degradation was rinsed with ethanol and placed at 60℃ for 2h to obtain recycled carbon fiber cloth.

[0044] (6) Replace the carbon fiber cloth in step (4) with the recycled carbon fiber cloth in step (5) and obtain the recyclable carbon fiber reinforced epoxy resin composite material according to the preparation process in step (4). Its tensile strength is shown in Table 2.

[0045] Example 5 (1) 16.46g of trithiodimethylhexahydrotriazine, 7.50g of 4,4'-methylenebis(phenyl isocyanate) and 240g of tetrahydrofuran were mixed evenly and stirred at 0 °C for 2h to obtain THBP-5, a terminal thiol hyperbranched polymer containing a hexahydrotriazine structure. Each mole of THBP-5 contains 6 mol of hydroxyl groups and has a number average molecular weight of 2396g / mol.

[0046] (2) 2.40g of THBP-5, 1.02g of 1-allyl-3-methylimidazolium chloride AMIMCl, and 0.03g of photoinitiator 1-hydroxy-1-methylethylphenyl ketone were mixed in proportion and mixed evenly. The mixture was then irradiated with ultraviolet light for 5 min (wavelength 365nm, light source power 2kW, power density 80W / cm) to obtain hyperbranched ionic liquid THBP-AMIMCl-5 with a number average molecular weight of 3420g / mol.

[0047] (3) Mix 0.05g of THBP-AMIMCl-5, 10g of bisphenol A epoxy resin and 2.21g of isoflurane diamine according to the ratio. After mixing thoroughly, pour the mixture into a mold sprayed with release agent and cure at 120℃ for 2h to obtain hyperbranched ionic liquid toughened epoxy resin. Its tensile strength is shown in Table 1.

[0048] (4) Mix 0.05g of THBP-AMIMCl-5, 10g of bisphenol A epoxy resin and 2.21g of isoflurane diamine according to the ratio. After the mixture is fully impregnated with carbon fiber cloth (carbon fiber grade T800), it is placed in a mold coated with release agent for lamination. It is then hot-pressed and cured at 120℃ for 2h under 10MPa. After hot pressing, it is cold-pressed at 10MPa for 10min and then taken out to obtain carbon fiber reinforced epoxy resin composite material. Its tensile strength is shown in Table 2.

[0049] (5) The carbon fiber reinforced epoxy resin composite material with a size of 10mm×10mm×4mm was immersed in a 1.0mol / L tetrahydrofuran solution of phosphoric acid for degradation. The degradation temperature was 25℃ and the degradation time was 3h. The fiber cloth obtained by degradation was rinsed with ethanol and placed at 60℃ for 2h to obtain recycled carbon fiber cloth.

[0050] (6) Replace the carbon fiber cloth in step (4) with the recycled carbon fiber cloth in step (5) and obtain the recyclable carbon fiber reinforced epoxy resin composite material according to the preparation process in step (4). Its tensile strength is shown in Table 2.

[0051] Comparative Example (1) Mix 10g of bisphenol A type epoxy resin and 2.21g of isoflurane diamine according to the ratio. After mixing thoroughly, pour the mixture into a mold sprayed with release agent and cure at 120℃ for 2h to obtain toughened epoxy resin. Its tensile strength is shown in Table 1.

[0052] (2) Mix 10g of bisphenol A type epoxy resin and 2.21g of isoflurane diamine. After the mixture is fully impregnated with carbon fiber cloth (carbon fiber grade T800), it is placed in a mold coated with release agent for lamination. It is then hot-pressed and cured at 120℃ for 2h under 10MPa. After hot pressing, it is cold-pressed at 10MPa for 10min and then taken out to obtain carbon fiber reinforced epoxy resin composite material. Its tensile strength is shown in Table 2.

[0053] Table 1. Properties of the toughened epoxy resins prepared in comparative examples and Examples 1-5

[0054] Table 2 Properties of carbon fiber reinforced epoxy resin composites prepared in Comparative Examples and Examples 1-5

[0055] Table 1 shows that the hyperbranched ionic liquid provided by this invention has the function of reinforcing and toughening epoxy resin. Table 2 shows that the hyperbranched ionic liquid provided by this invention can significantly improve the tensile strength and interlaminar shear strength of carbon fiber composites, and also make the prepared carbon fiber composites degradable and recyclable; when the recycled carbon fibers are reused to make carbon fiber composites, they can still maintain good mechanical properties and have good reusability.

[0056] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the inventive concept, and all such substitutions or modifications should be considered within the scope of protection of the present invention.

Claims

1. A hyperbranched ionic liquid for manufacturing carbon fiber composite materials, characterized in that, The hyperbranched ionic liquid is obtained by reacting a terminal thiol hyperbranched polymer containing a hexahydrotriazine structure with an allyl ionic liquid via a thiol-olefin click reaction. The number-average molecular weight of the hyperbranched ionic liquid is 2000-23000 g / mol. The structural formula of the terminal thiol hyperbranched polymer containing a hexahydrotriazine structure is formula (1), formula (2), formula (3), or formula (4). Equation (1) Equation (2), Equation (3) Equation (4); The structure of R1 is R2 is one or more of the following structures: 、 、 、 、 。 2. The hyperbranched ionic liquid for manufacturing carbon fiber composite materials as described in claim 1, characterized in that, The hyperbranched ionic liquid is obtained by a thiol-olefin click reaction under ultraviolet light irradiation from a terminal thiol hyperbranched polymer containing a hexahydrotriazine structure, an allyl ionic liquid, and a photoinitiator. The molar ratio of the terminal thiol hyperbranched polymer containing a hexahydrotriazine structure to the allyl ionic liquid is 1:1, and the mass ratio of the terminal thiol hyperbranched polymer containing a hexahydrotriazine structure to the photoinitiator is 100:(0.1-2.0).

3. The hyperbranched ionic liquid for manufacturing carbon fiber composite materials as described in claim 2, characterized in that, The allyl ionic liquid is one or more of 1-allyl-3-methylimidazolium chloride, 1-allyl-3-methylimidazolium bromide, 1-allyl-3-methylimidazolium tetrafluoroborate, 1-allyl-3-methylimidazolium hexafluorophosphate, and 1-allyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide; the photoinitiator is one or more of 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone, 1-hydroxycyclohexylphenyl ketone, benzoyl isopropanol, 1-hydroxy-1-methylethylphenyl ketone, and (2,4,6-trimethylbenzoyl)diphenylphosphine oxide.

4. A hyperbranched ionic liquid for manufacturing carbon fiber composite materials as described in any one of claims 1-3, characterized in that, The terminal thiol hyperbranched polymer containing a hexahydrotriazine structure is obtained by reacting trithiohexahydrotriazine with a diisocyanate monomer, wherein the mass ratio of trithiohexahydrotriazine to the isocyanate monomer is 100:(30-59).

5. A method for manufacturing a hyperbranched ionic liquid for producing carbon fiber composite materials as described in claims 1-4, characterized in that, Includes the following steps: (1) The terminal thiol hyperbranched polymer containing a hexahydrotriazine structure, the allyl ionic liquid and the photoinitiator are uniformly mixed; the molar ratio of the terminal thiol hyperbranched polymer containing a hexahydrotriazine structure to the allyl ionic liquid is 1:1, and the mass ratio of the terminal thiol hyperbranched polymer containing a hexahydrotriazine structure to the photoinitiator is 100:(0.1-2.0). (2) Under ultraviolet light irradiation, a hyperbranched ionic liquid is obtained by a thiol-olefin click reaction for 5-10 minutes.

6. The method for manufacturing a hyperbranched ionic liquid for producing carbon fiber composite materials as described in claim 5, characterized in that, A method for manufacturing a terminal thiol hyperbranched polymer containing a hexahydrotriazine structure includes the following steps: mixing trithiol hexahydrotriazine, a diisocyanate monomer, and a solvent uniformly, and stirring the mixture at 0-20°C for 1-2 hours to obtain a terminal thiol hyperbranched polymer containing a hexahydrotriazine structure; wherein the diisocyanate monomer is one of hexamethylene diisocyanate, isophorone diisocyanate, 4,4'-methylenebis(phenyl isocyanate), and toluene diisocyanate; wherein the solvent is one of tetrahydrofuran, acetone, N,N-dimethylformamide, and chloroform; wherein the mass ratio of trithiol hexahydrotriazine to isocyanate monomer is 100:(30-59); and wherein the mass ratio of the reactant trithiol hexahydrotriazine monomer to solvent is 1:(5-20).

7. The method of using the hyperbranched ionic liquid as described in claims 1-4, or the hyperbranched ionic liquid prepared by the method as described in claims 5-6, in the manufacture of carbon fiber composite materials, characterized in that... Includes the following steps: A. Mix the hyperbranched ionic liquid, bisphenol A epoxy resin and curing agent evenly to obtain a hyperbranched ionic mixed liquid; B. After thoroughly impregnating the carbon fiber cloth with the hyperbranched ion mixed liquid, place it in a mold for lamination and thermosetting to obtain a carbon fiber reinforced composite material.

8. The method of using the hyperbranched ionic liquid as described in claim 7 in the manufacture of carbon fiber composite materials, characterized in that, The mass ratio of bisphenol A epoxy resin, hyperbranched ionic liquid and curing agent is 100:(0.1-10):(10-30).

9. The method of using the hyperbranched ionic liquid as described in claim 7 or 8 in the manufacture of carbon fiber composite materials, characterized in that, The process also includes step C: degrading the carbon fiber reinforced composite material obtained in step B in a 0.1-2.0 mol / L phosphoric acid tetrahydrofuran solution, and then washing the degraded carbon fiber cloth with ethanol to obtain recyclable carbon fiber cloth.

10. The method of using the hyperbranched ionic liquid as described in claim 9 in the manufacture of carbon fiber composite materials, characterized in that, The recyclable carbon fiber cloth obtained in step C can replace the carbon fiber cloth in step B. It can be laminated and thermocured using the manufacturing method in step B to obtain a recyclable carbon fiber reinforced composite material.

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