Carbon fiber / epoxy resin composite material with optimized PVDF / PEMA-carbon fiber integrated structure constructed based on roller electrostatic spinning technology, preparation method and application

Abstract

The invention belongs to the technical field of novel materials, and particularly relates to a PVDF / PEMA-carbon fiber integrated structure optimized carbon fiber / epoxy resin composite material constructed based on a roller electrostatic spinning technology, a preparation method and application. According to the invention, carbon fiber is used as a base material, and roller electrostatic spinning PVDF / PEMA micro-nano fiber is used as a high-performance modifier. By introducing electrostatic spinning PVDF / PEMA micro-nano fibers, the interfacial interaction between the carbon fibers and a resin matrix is enhanced, and a micro-nano fiber bridging structure is constructed to reinforce interlayer bonding, so that the carbon fiber / epoxy resin composite material with an optimized PVDF / PEMA-carbon fiber integrated structure constructed by a roller electrostatic spinning technology is prepared.

Description

Technical Field

[0001] The present invention belongs to the technical field of new materials, and specifically relates to a carbon fiber / epoxy resin composite material with an optimized PVDF / PEMA-carbon fiber integrated structure constructed based on drum electrospinning technology, a preparation method and an application thereof. Background Art

[0002] As a structural lightweight material, carbon fiber / epoxy resin composites have excellent properties such as high specific strength, high specific modulus, and acid and alkali corrosion resistance. They are widely used in aerospace, national defense, and high-end equipment manufacturing fields, such as civil airliners, fuselage structural components of fighter jets, and missile shells. However, the composite materials made by the bonding process have performance shortcomings such as high brittleness and easy peeling of the epoxy resin adhesive itself, which will cause the cured adhesive layer structure to have weak anti-peeling and mechanical impact resistance, making the composite materials prone to failure such as structural delamination. In actual commercial applications, this will cause catastrophic failures of components or equipment in service operations. Therefore, it is of great significance to enhance the mechanical properties of the layered structure of carbon fiber / epoxy resin composites.

[0003] As a high-performance polymer, polyvinylidene fluoride (PVDF) has good piezoelectricity, chemical stability, thermal stability, high mechanical strength and good impact resistance. In the spinning process, viscosity is one of the key factors to ensure fiber formation and stable spinning. By adding ethylene-co-maleic anhydride copolymer (PEMA), the viscosity of the PVDF solution can be increased, thereby improving the stability and controllability of the spinning solution. This helps to form more uniform and continuous fibers during the spinning process and improves the mechanical strength and wear resistance of the fibers. Compared with other polymer systems, the PVDF / PEMA combination is expected to maximize cost-effectiveness by adjusting the ratio while maintaining high performance, meeting the demand for high-performance fiber materials in different fields from high-end technology to daily consumer products. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a method for preparing a carbon fiber / epoxy resin composite material with an optimized PVDF / PEMA-carbon fiber integrated structure constructed based on drum electrospinning technology, comprising the following steps:

[0005] S1: N,N-dimethylformamide is mixed with an acetone solution to obtain a mixed solution, polyvinylidene fluoride powder and ethylene-co-maleic anhydride copolymer are weighed, and then the polyvinylidene fluoride powder and ethylene-co-maleic anhydride copolymer are added together to the mixed solution, heated in a water bath, and allowed to stand to obtain an electrospinning solution, and a carbon fiber cloth is obtained, and a PVDF / PEMA-carbon fiber integrated structure is constructed on the surface of the carbon fiber cloth by using a drum electrospinning technology;

[0006] S2: Mixing epoxy resin and curing agent and applying them to carbon fiber cloth, and forming a carbon fiber / epoxy resin composite body by hand lay-up and gluing, wherein one layer of PVDF / PEMA micro-nano fiber is distributed between every two carbon fiber cloths in the carbon fiber / epoxy resin composite body;

[0007] S3: A carbon fiber / epoxy resin composite material blank with an optimized PVDF / PEMA-carbon fiber integrated structure is obtained by compression molding, and a fully cured PVDF / PEMA-carbon fiber integrated structure optimized carbon fiber / epoxy resin composite material is obtained by constant temperature curing.

[0008] Furthermore, the volume ratio of N,N-dimethylformamide and acetone solution described in S1 is 2:1; the mass ratio of polyvinylidene fluoride powder and ethylene-co-maleic anhydride copolymer described in S1 is 4:1.

[0009] Furthermore, the water bath heating temperature described in S1 is 65° C., the heating time is 4 h, and the standing time is 12 h.

[0010] Furthermore, in the electrospinning process described in S1, the drum speed is 130 r / min, the spinning voltage is 14 kV, the liquid supply rate is 1.0 mL / h, and the distance between the needle and the collector is 20 cm.

[0011] Furthermore, the surface density of PVDF / PEMA in the PVDF / PEMA-carbon fiber integrated structure described in S1 is 0.08-0.48 g / m 2 .

[0012] Furthermore, the carbon fiber / epoxy resin composite material blank described in S2 is 10 layers, including 9 layers of carbon fiber cloth containing PVDF / PEMA micro-nano fibers and 1 layer of carbon fiber cloth not containing PVDF / PEMA micro-nano fibers, and the mass ratio of epoxy resin to added curing agent is 5:1.

[0013] Furthermore, the hand lay-up process described in S2 includes 1 carbon fiber cloth without PVDF / PEMA micro-nano fibers and 9 carbon fiber cloths with surfaces covered with PVDF / PEMA micro-nano fibers, which are stacked together in sequence by gluing, and the gluing is that a layer of PVDF / PEMA micro-nano fibers with added epoxy resin and curing agent is contained between the carbon fiber cloths.

[0014] Furthermore, the compression strength in the compression molding process described in S3 is 1.5MPa to 2.0MPa, and the pressure holding time is 15h to 24h; the constant temperature curing temperature is 50°C to 60°C, and the curing time is 72h to 120h.

[0015] A carbon fiber / epoxy resin composite material with an optimized PVDF / PEMA-carbon fiber integrated structure constructed based on drum electrospinning technology, wherein the carbon fiber / epoxy resin composite material is a carbon fiber / epoxy resin composite material blank with an optimized PVDF / PEMA-carbon fiber integrated structure of 10 layers of carbon fiber cloth + 9 layers of PVDF / PEMA micro-nano fibers, and the PVDF / PEMA micro-nano fibers are deposited on the surface of the carbon fiber cloth in a disordered or partially oriented manner to form a multi-directional bridging structure.

[0016] The invention discloses an application of a carbon fiber / epoxy resin composite material with an optimized PVDF / PEMA-carbon fiber integrated structure constructed based on a drum electrostatic spinning technology. The carbon fiber / epoxy resin composite material is applied in the preparation of a high-strength composite material.

[0017] Beneficial Effects

[0018] A preparation method of a carbon fiber / epoxy resin composite material with an optimized PVDF / PEMA-carbon fiber integrated structure constructed based on a drum electrostatic spinning technology provided by the present invention. The drum electrostatic spinning technology is used to successfully construct a PVDF / PEMA-carbon fiber integrated structure on the surface of the carbon fiber cloth. During the electrostatic spinning process, the addition of PEMA promotes the PVDF / PEMA micro-nano fibers to have a certain viscosity, and the interface bonding between the PVDF / PEMA micro-nano fibers and the carbon fiber is enhanced; the integrated structure formed not only realizes the uniform dispersion of the micro-nano fibers on the carbon fiber cloth, overcomes the problems of uneven fiber distribution and easy generation of resin-rich areas that may be caused by the introduction of reinforcing fibers between the external layers, but also makes it difficult for the composite material to debond and delaminate at the interface when subjected to external forces, thereby improving the overall strength and toughness of the composite material. In addition, the multi-directional bridging structure formed by the drum electrostatic spinning micro-nano fibers on the carbon fiber cloth effectively improves the interlayer performance of the composite material. When subjected to external forces, these bridging structures can prevent the expansion of cracks, thereby ensuring the stability of the material structure.

[0019] PVDF / PEMA micro-nano fibers prepared by drum electrospinning technology have become an ideal choice for optimizing carbon fiber / epoxy resin composites due to their extremely fine fiber diameter, good flexibility and unique micro-nano structure. These micro-nano fibers can not only effectively improve the overall mechanical properties of the composite material as a reinforcing phase, but also significantly improve the brittleness of the resin matrix, and strengthen the interlayer bonding by forming a fiber bridging structure between the layers, thereby greatly improving the interlayer shear strength and impact resistance of the composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0021] Figure 1 The microscopic morphology and preparation schematic diagram of the carbon fiber / epoxy resin composite material with optimized PVDF / PEMA-carbon fiber integrated structure constructed based on the drum electrospinning technology of the present invention;

[0022] Figure 2 This is a diagram of the mechanical properties and reinforcement mechanism of the carbon fiber / epoxy resin composite material with optimized PVDF / PEMA-carbon fiber integrated structure constructed based on the drum electrospinning technology of the present invention. DETAILED DESCRIPTION

[0023] The following will be combined with Examples 1 to 6 of the present invention and Comparative Example 1 and the attached Figures 1-2 , the technical solution of the present invention is clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The present invention provides a method for preparing a carbon fiber / epoxy resin composite material with an optimized PVDF / PEMA-carbon fiber integrated structure constructed based on a drum electrospinning technology.

[0025] S1: First, N,N-dimethylformamide (DMF) and acetone solution are mixed evenly, and then polyvinylidene fluoride (PVDF) powder with a mass fraction of 18% of the mixed solution is weighed, and then ethylene-co-maleic anhydride copolymer (PEMA) is weighed according to 1 / 4 of the PVDF content, and PVDF and PEMA are added together to the DMF and acetone mixed solution, heated and dissolved in a water bath, and after complete dissolution, the excess bubbles are removed to finally obtain an electrospinning solution; at room temperature, the roller electrospinning technology is used; PVDF / PEMA-carbon fiber integrated structures with different surface densities are constructed on the obtained carbon fiber cloths of the same shape and size;

[0026] S2: The epoxy resin and the curing agent are uniformly mixed and applied to 10 layers of carbon fiber cloth, and a 10-layer carbon fiber / epoxy resin composite body is formed by hand lay-up and bonding; wherein the hand lay-up refers to a specific number of carbon fiber cloths, including 1 carbon fiber cloth without PVDF / PEMA micro-nano fibers and 9 carbon fiber cloths with PVDF / PEMA micro-nano fibers on the surface, which are stacked together in sequence by bonding (see Figure 1 D2), a layer of PVDF / PEMA micro-nano fibers is distributed between every two carbon fiber cloths in the formed carbon fiber / epoxy resin composite blank; bonding means that a layer of PVDF / PEMA micro-nano fibers with epoxy resin and curing agent added is contained between the carbon fiber cloths to form a carbon fiber / epoxy resin composite blank with an optimized PVDF / PEMA-carbon fiber integrated structure of 10 layers of carbon fiber cloths + 9 layers of PVDF / PEMA micro-nano fibers;

[0027] S3: A carbon fiber / epoxy resin composite material blank with an optimized PVDF / PEMA-carbon fiber integrated structure is obtained by compression molding, and a fully cured PVDF / PEMA-carbon fiber integrated structure optimized carbon fiber / epoxy resin composite material is obtained by constant temperature curing.

[0028] Example 1

[0029] S1: 12 mL of N,N-dimethylformamide (DMF) was mixed with 6 mL of acetone solution, and then 2.88 g of polyvinylidene fluoride (PVDF) powder and 0.72 g of ethylene-co-maleic anhydride copolymer (PEMA) were weighed. PVDF and PEMA were added to the DMF and acetone mixed solution, and heated in a 65°C water bath for 4 hours to dissolve. After complete dissolution, it was allowed to stand for 12 hours to remove excess bubbles, and finally an electrospinning solution was obtained. At room temperature, the drum electrospinning technology was used, with a drum speed of 130 r / min, a spinning voltage of 14 kV, a liquid supply rate of 1.0 mL / h, and a spinning distance of 20 cm. PVDF / PEMA-carbon fiber integrated structures with different surface densities were constructed on the surface of the carbon fiber cloth. The surface densities of PVDF / PEMA micro-nanofibers on the surface of the carbon fiber cloth were 0.08 g / m 2 , 0.16g / m 2 , 0.24g / m 2 , 0.32g / m 2 , 0.40g / m 2 , 0.48g / m 2 ;

[0030] S2: Weigh 70.00g of epoxy resin, add 14.00g of 206 curing agent, mix and stir until uniformly mixed to obtain a precursor mixture for bonding; obtain 10 layers of carbon fiber cloth + 9 layers with a surface density of 0.08g / m by staggered stacking. 2 PVDF / EMA micro-nano fiber / epoxy resin layered material blank;

[0031] S3: A compression molding process with a pressure of 2 MPa and a holding time of 24 h was used to obtain a carbon fiber / epoxy resin composite material semi-finished product with an optimized PVDF / PEMA-carbon fiber integrated structure. After constant temperature curing at 60 ° C for 96 h, the surface density was 0.08 g / m 2 Fully cured PVDF / PEMA-carbon fiber integrated structure optimized carbon fiber / epoxy resin composite.

[0032] The flexural strength of the carbon fiber / epoxy resin composite material with optimized integrated structure of drum electrospun PVDF / PEMA-carbon fiber obtained in Example 1 is 830.31 MPa.

[0033] pass Figure 1 (C) It can be seen that PVDF / PEMA micro-nanofibers are deposited on the surface of carbon fiber cloth in a disordered or partially oriented manner, which helps to construct a multi-directional bridging structure between layers.

[0034] Example 2

[0035] S1: The electrospinning parameters and the preparation method of the electrospinning solution are the same as those in Example 1;

[0036] S2: The precursor mixture for bonding is the same as that in Example 1; 10 layers of carbon fiber cloth + 9 layers are obtained by staggered stacking with a surface density of 0.16 g / m 2 PVDF / EMA micro-nano fiber / epoxy resin layered material blank;

[0037] S3: A compression molding process with a pressure of 2 MPa and a holding time of 24 h was used to obtain a carbon fiber / epoxy resin composite semi-finished product with an optimized PVDF / PEMA-carbon fiber integrated structure. The surface density was 0.16 g / m after constant temperature curing at 60 °C for 96 h. 2 Fully cured PVDF / PEMA-carbon fiber integrated structure optimized carbon fiber / epoxy resin composite

[0038] The flexural strength of the carbon fiber / epoxy resin composite material with optimized integrated structure of PVDF / PEMA-carbon fiber spun by drum prepared in Example 2 is 888.24 MPa.

[0039] Example 3

[0040] S1: The electrospinning parameters and the preparation method of the electrospinning solution are the same as those in Example 1;

[0041] S2: The precursor mixture for bonding is the same as that in Example 1; 10 layers of carbon fiber cloth + 9 layers are obtained by staggered stacking with a surface density of 0.24 g / m 2 PVDF / EMA micro-nano fiber / epoxy resin layered material blank;

[0042] S3: A compression molding process with a pressure of 2 MPa and a holding time of 24 h was used to obtain a carbon fiber / epoxy resin composite semi-finished product with an optimized PVDF / PEMA-carbon fiber integrated structure. The surface density was 0.24 g / m after constant temperature curing at 60 °C for 96 h. 2 Fully cured PVDF / PEMA-carbon fiber integrated structure optimized carbon fiber / epoxy resin composite.

[0043] The flexural strength of the carbon fiber / epoxy resin composite material with optimized integrated structure of PVDF / PEMA-carbon fiber prepared by drum electrospinning in Example 3 is 839.53 MPa.

[0044] Example 4

[0045] S1: The electrospinning parameters and the preparation method of the electrospinning solution are the same as those in Example 1;

[0046] S2: The precursor mixture for bonding is the same as that in Example 1; 10 layers of carbon fiber cloth + 9 layers are obtained by staggered stacking with a surface density of 0.32 g / m 2 PVDF / EMA micro-nano fiber / epoxy resin layered material blank;

[0047] S3: A compression molding process with a pressure of 2 MPa and a holding time of 24 h was used to obtain a carbon fiber / epoxy resin composite semi-finished product with an optimized PVDF / PEMA-carbon fiber integrated structure. The surface density was 0.32 g / m after constant temperature curing at 60 °C for 96 h. 2 Fully cured PVDF / PEMA-carbon fiber integrated structure optimized carbon fiber / epoxy resin composite.

[0048] The flexural strength of the carbon fiber / epoxy resin composite material with optimized integrated structure of drum electrospun PVDF / PEMA-carbon fiber prepared in Example 4 is 867.95 MPa.

[0049] Example 5

[0050] S1: The electrospinning parameters and the preparation method of the electrospinning solution are the same as those in Example 1;

[0051] S2: The precursor mixture for bonding is the same as that in Example 1; 10 layers of carbon fiber cloth + 9 layers are obtained by staggered stacking with a surface density of 0.40 g / m 2 PVDF / EMA micro-nano fiber / epoxy resin layered material blank;

[0052] S3: A compression molding process with a pressure of 2 MPa and a holding time of 24 h was used to obtain a carbon fiber / epoxy resin composite semi-finished product with an optimized PVDF / PEMA-carbon fiber integrated structure. The surface density was 0.40 g / m after constant temperature curing at 60 °C for 96 h. 2 Fully cured PVDF / PEMA-carbon fiber integrated structure optimized carbon fiber / epoxy resin composite.

[0053] Example 6

[0054] S1: The electrospinning parameters and the preparation method of the electrospinning solution are the same as those in Example 1;

[0055] S2: The precursor mixture for bonding is the same as that in Example 1; 10 layers of carbon fiber cloth + 9 layers are obtained by staggered stacking with a surface density of 0.48 g / m 2 PVDF / EMA micro-nano fiber / epoxy resin layered material blank;

[0056] S3: A compression molding process with a pressure of 2 MPa and a holding time of 24 h was used to obtain a carbon fiber / epoxy resin composite semi-finished product with an optimized PVDF / PEMA-carbon fiber integrated structure. The surface density was 0.48 g / m after constant temperature curing at 60 °C for 96 h. 2 Fully cured PVDF / PEMA-carbon fiber integrated structure optimized carbon fiber / epoxy resin composite.

[0057] The flexural strength of the carbon fiber / epoxy resin composite material with optimized integrated structure of drum electrospun PVDF / PEMA-carbon fiber prepared in Example 6 is 808.60 MPa.

[0058] Comparative Example 1

[0059] S1: The electrospinning parameters and the preparation method of the electrospinning solution are the same as those in Example 1;

[0060] S2: The precursor mixture for bonding is the same as that in Example 1; a mixture of epoxy resin and curing agent is added to the carbon fiber cloth and evenly applied, and a layered material blank of 10 layers of carbon fiber cloth is obtained by stacking and laying;

[0061] S3: A carbon fiber / epoxy resin composite semi-finished product was obtained by a compression molding process with a pressure of 2.0 MPa and a holding time of 24 h, and a fully cured carbon fiber / epoxy resin composite material was obtained by constant temperature curing at 60° C. for 96 h.

[0062] The flexural strength of the carbon fiber / epoxy resin composite material prepared in Comparative Example 1 is 709.85 MPa.

[0063] Therefore, the results obtained from Examples 1 to 6 and Comparative Example 1 indicate that the carbon fiber / epoxy resin composite material with optimized PVDF / PEMA-carbon fiber integrated structure provided by the present invention has the best interlaminar shear strength and impact resistance.

[0064] In the prior art, some people use PVDF / PMMA together to make lithium battery composite diaphragms, which provides inspiration for the use of PVDF / PMMA together. However, in this application document, we use PVDF / PEMA after creative thinking. PVDF / PEMA and PVDF / PMMA are different in the physical and chemical properties of the materials themselves, the preparation method of the composite materials, the product form of the composite materials, the effects of PEMA and PMMA (polymethyl methacrylate) on the formed composite materials, and the application scenarios of the final composite materials.

[0065] In addition, the prior art also mentions the combined use of PVDF-CTFE (poly(vinylidene fluoride-trifluoroethylene) copolymer) and PEMA (polyethyl methacrylate), but in the present application document, PVDF and PVDF-CTFE are essentially different, with great differences in chemical structure, performance differences and application fields, and the raw materials used are also different. Polyethyl methacrylate is used in the prior art, but ethylene-co-maleic anhydride copolymer is used in the application document. Although both are referred to as PEMA, the two substances are completely different and have different properties and effects. The selection of these components is also obtained after creative thinking, and the combination of PVDF-CTFE and polyethyl methacrylate will also cause a modified grafting reaction of the polyethyl methacrylate side chain, which will not occur in the present patent. This also greatly proves that the components and preparation methods we use are uniquely thought out, and the components and steps also play a synergistic role, producing unexpected technical effects.

[0066] The present invention provides a method for preparing a carbon fiber / epoxy resin composite material with an optimized integrated structure of PVDF / PEMA-carbon fiber constructed based on a drum electrostatic spinning technology. The drum electrostatic spinning technology is used to successfully construct a tightly integrated structure of PVDF / PEMA micro-nano fibers and carbon fibers on the surface of carbon fiber cloth, so that the micro-nano fibers are evenly distributed on the carbon fiber cloth, overcoming the problems of uneven fiber distribution and resin-rich areas that may be caused by the introduction of traditional reinforcing fibers. Through the addition of PEMA, the interface bonding between PVDF / PEMA micro-nano fibers is effectively enhanced, thereby improving the interface strength of the composite material, avoiding debonding and delamination under external force, and improving overall strength and toughness. In addition, the multi-directional bridging structure of micro-nano fibers on carbon fiber cloth effectively improves the interlayer performance of the composite material, can prevent crack propagation, and ensure the stability of the material structure. In short, the micro-nano fiber reinforced composite material optimized by the drum electrostatic spinning technology of the present invention not only significantly improves the mechanical properties of the composite material, but also improves interlayer shear strength and impact resistance, and has a wide range of application prospects.

Claims

1. A method for preparing a carbon fiber / epoxy resin composite material with an optimized PVDF / PEMA-carbon fiber integrated structure based on drum electrospinning technology, characterized in that: The following steps are involved: S1: N,N-dimethylformamide is mixed with an acetone solution to obtain a mixed solution, polyvinylidene fluoride powder and ethylene-co-maleic anhydride copolymer are weighed, and then the polyvinylidene fluoride powder and ethylene-co-maleic anhydride copolymer are added together to the mixed solution, heated in a water bath, and allowed to stand to obtain an electrospinning solution, and a carbon fiber cloth is obtained, and a PVDF / PEMA-carbon fiber integrated structure is constructed on the surface of the carbon fiber cloth by using a drum electrospinning technology; S2: Mixing epoxy resin and curing agent and applying them to carbon fiber cloth, and forming a carbon fiber / epoxy resin composite body by hand lay-up and gluing, wherein one layer of PVDF / PEMA micro-nano fiber is distributed between every two carbon fiber cloths in the carbon fiber / epoxy resin composite body; S3: A carbon fiber / epoxy resin composite material blank with an optimized PVDF / PEMA-carbon fiber integrated structure is obtained by compression molding, and a fully cured PVDF / PEMA-carbon fiber integrated structure optimized carbon fiber / epoxy resin composite material is obtained by constant temperature curing.

2. The method for preparing a carbon fiber / epoxy resin composite material with optimized PVDF / PEMA-carbon fiber integrated structure constructed based on drum electrospinning technology according to claim 1, characterized in that: The volume ratio of N,N-dimethylformamide and acetone solution described in S1 is 2:1; the mass ratio of polyvinylidene fluoride powder and ethylene-co-maleic anhydride copolymer described in S1 is 4:

1.

3. The method for preparing a carbon fiber / epoxy resin composite material with optimized PVDF / PEMA-carbon fiber integrated structure constructed based on drum electrospinning technology according to claim 1, characterized in that: The water bath heating temperature described in S1 is 65° C., the heating time is 4 h, and the standing time is 12 h.

4. The method for preparing a carbon fiber / epoxy resin composite material with optimized PVDF / PEMA-carbon fiber integrated structure constructed based on drum electrospinning technology according to claim 1, characterized in that: In the electrospinning process described in S1, the drum speed was 130 r / min, the spinning voltage was 14 kV, the liquid supply rate was 1.0 mL / h, and the distance between the needle and the collector was 20 cm.

5. The method for preparing a carbon fiber / epoxy resin composite material with optimized PVDF / PEMA-carbon fiber integrated structure constructed based on drum electrospinning technology according to claim 1, characterized in that: The surface density of PVDF / PEMA in the PVDF / PEMA-carbon fiber integrated structure described in S1 is 0.08-0.48 g / m 2 .

6. The method for preparing a carbon fiber / epoxy resin composite material with optimized PVDF / PEMA-carbon fiber integrated structure constructed based on drum electrospinning technology according to claim 1, characterized in that: The carbon fiber / epoxy resin composite blank described in S2 is 10 layers, including 9 layers of carbon fiber cloth containing PVDF / PEMA micro-nano fibers and 1 layer of carbon fiber cloth without PVDF / PEMA micro-nano fibers, and the mass ratio of epoxy resin to added curing agent is 5:

1.

7. The method for preparing a carbon fiber / epoxy resin composite material with optimized PVDF / PEMA-carbon fiber integrated structure constructed based on drum electrospinning technology according to claim 1, characterized in that: The hand lay-up process described in S2 includes 1 carbon fiber cloth without PVDF / PEMA micro-nano fibers and 9 carbon fiber cloths with PVDF / PEMA micro-nano fibers covered on the surface, which are stacked together in sequence by gluing, wherein the gluing is a layer of PVDF / PEMA micro-nano fibers with added epoxy resin and curing agent between the carbon fiber cloths.

8. The method for preparing a carbon fiber / epoxy resin composite material with optimized PVDF / PEMA-carbon fiber integrated structure constructed based on drum electrospinning technology according to claim 1, characterized in that: The compression strength in the compression molding process described in S3 is 1.5MPa to 2.0MPa, and the pressure holding time is 15h to 24h; the constant temperature curing temperature is 50℃ to 60℃, and the curing time is 72h to 120h.

9. A carbon fiber / epoxy resin composite material with optimized PVDF / PEMA-carbon fiber integrated structure constructed based on drum electrospinning technology obtained by the preparation method according to any one of claims 1 to 8, characterized in that: The carbon fiber / epoxy resin composite material is a carbon fiber / epoxy resin composite material blank with an optimized PVDF / PEMA-carbon fiber integrated structure of 10 layers of carbon fiber cloth + 9 layers of PVDF / PEMA micro-nano fibers, and the PVDF / PEMA micro-nano fibers are deposited on the surface of the carbon fiber cloth in a disordered or partially oriented manner to form a multi-directional bridging structure.

10. The use of a carbon fiber / epoxy resin composite material with an optimized PVDF / PEMA-carbon fiber integrated structure constructed based on drum electrospinning technology according to claim 9, characterized in that: The carbon fiber / epoxy resin composite material is used in preparing high-strength composite materials.

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