Modified carbon felt reinforced fiber resin-based composite material as well as preparation method and application thereof

Abstract

The invention discloses a modified carbon felt reinforced fiber resin-based composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: applying benzoxazine resin to the surface of a carbon felt and carrying out laser treatment to prepare a three-dimensional porous carbon material modified carbon felt; and carrying out composite laying and curing treatment on the three-dimensional porous carbon material modified carbon felt, reinforced fibers and a resin matrix to prepare the modified carbon felt reinforced fiber resin-based composite material. A strong bonding layer is constructed on the interface of the carbon felt and the fiber-resin matrix through modification of the three-dimensional porous carbon material, so that the interface bonding strength and the overall bending mechanical property of the composite material are remarkably improved, the composite material is synchronously endowed with excellent conductivity, and the structure and function integration of the composite material is realized; meanwhile, the composite material can be widely applied to the field of high mechanical-high conductivity integrated lightweight structures, and particularly has important practical value in the aspects of intelligent sensing, composite material electrocuring, low-temperature heating deicing and the like.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology, specifically relating to a modified carbon felt reinforced fiber resin matrix composite material, its preparation method, and its application. Background Technology

[0002] Fiber-reinforced resin matrix composites, with their lightweight, high strength, and flexible molding properties, have become core materials for lightweight structures in aerospace, rail transportation, and wind power equipment. Among them, glass fiber composites dominate the market due to their low cost and mature technology, while bio-based / natural fiber composites such as flax, ramie, and bamboo fiber align with the trend of low-carbon development and have broad application prospects. However, these fibers generally suffer from weak interfacial bonding between the fiber and resin matrix, making them prone to interfacial debonding and delamination failure under stress, severely restricting the improvement of the overall mechanical properties of the composites. Simultaneously, with the increasing demand for integrated structural and functional materials across various fields, functional requirements such as electromagnetic shielding, lightning protection, and static dissipation are becoming increasingly urgent. Since both the fiber and resin matrix in these composites are insulating materials, the inherent conductivity of the composites is lacking, failing to meet the aforementioned integrated functional application requirements. This has become a bottleneck restricting their expansion into higher-end key fields.

[0003] In recent years, researchers have proposed various modification methods, such as nanoparticle deposition (patent CN115958852A), carbon material grafting (patent CN121045816A), laser etching (Optics & Laser Technology 180 (2025) 111562), chemical oxidation (Materials Today Chemistry 46 (2025) 102708), and polymer sizing (patent CN120309997A). However, these methods generally suffer from the following problems: on the one hand, it is difficult to maintain a stable and long-term strengthening of the fiber-resin interface bond strength, and delamination and delamination failures are still prone to occur under stress, making it impossible to overcome the bottleneck of mechanical properties; on the other hand, it is difficult to effectively impart the conductivity required for electromagnetic shielding and lightning protection to composite materials, making it difficult to meet the requirements of integrated structure and function. More importantly, most methods rely on complex chemical synthesis or precise physical modification processes, which have problems such as long reaction cycles and cumbersome operation procedures, making them unsuitable for large-scale continuous production. Even if some simple modification methods are attempted to be implemented in industrial production, they face real challenges such as easy damage to the fiber's inherent strength, prominent pollution risks, and high manufacturing costs, and have never been able to break through the technical bottleneck of structural-functional integration. Summary of the Invention

[0004] The main objective of this invention is to provide a modified carbon felt reinforced fiber resin matrix composite material, its preparation method, and its application, so as to overcome the shortcomings of the prior art.

[0005] To achieve the aforementioned objectives, the technical solution adopted by this invention includes:

[0006] This invention provides a method for preparing a modified carbon felt reinforced fiber resin-based composite material, comprising:

[0007] A three-dimensional porous carbon material modified carbon felt was prepared by applying benzoxazine resin to the surface of carbon felt and then laser processing.

[0008] Furthermore, the modified carbon felt made of the three-dimensional porous carbon material is composite-laid with reinforcing fibers and resin matrix and cured to obtain a modified carbon felt reinforced fiber resin matrix composite material.

[0009] The present invention also provides a modified carbon felt reinforced fiber resin matrix composite material prepared by the aforementioned preparation method, comprising: a three-dimensional porous carbon material modified carbon felt as a reinforcing phase, reinforcing fibers, and a resin matrix as a matrix phase; wherein the three-dimensional porous carbon material in the three-dimensional porous carbon material modified carbon felt forms an interlocking structure with the resin matrix and generates an interfacial anchoring effect with the reinforcing fibers.

[0010] This invention also provides the application of the aforementioned modified carbon felt reinforced fiber resin matrix composite material in the field of high mechanical properties and high electrical conductivity integrated lightweight structural materials.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] (1) In this invention, three-dimensional porous carbon material is used as an interface bridging phase. Its three-dimensional porous structure forms a physical interlock with the resin matrix, and the active groups form a chemical anchor with the reinforcing fibers and resin, which greatly improves the interfacial bonding strength, thereby increasing the flexural strength of the composite material by 10% to 20% and the flexural modulus by 20% to 30%.

[0013] (2) The three-dimensional porous carbon material in this invention simultaneously constructs conductive pathways, which greatly improves the conductivity of the composite material and realizes the integration of structure and function with mechanical properties as the main property and conductive properties as the auxiliary property. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a comparison chart of the flexural strength and flexural modulus of the composite materials prepared in Comparative Example 1, Comparative Example 2 and Example 1 of the present invention;

[0016] Figure 2 This is a comparison chart of the electrical conductivity of the composite materials prepared in Comparative Example 1, Comparative Example 2 and Example 1 of the present invention;

[0017] Figure 3 The stress and strain curves of the composite materials prepared in Comparative Examples 1, 2 and 1 of this invention during bending tests are shown.

[0018] Figure 4 This is a sample image of the composite material prepared in Example 1 of the present invention. Detailed Implementation

[0019] In view of the deficiencies of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. By growing three-dimensional porous carbon material in situ on the surface of carbon felt, a strong interfacial bond is constructed to solve the problem of weak fiber-resin interfacial bonding. This significantly improves the mechanical properties of the composite material while endowing it with excellent electrical conductivity, ultimately achieving the goal of structural and functional integration of the composite material.

[0020] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In this invention, benzoxazine resin is used to generate three-dimensional porous carbon material in situ on the surface of carbon felt under laser irradiation. Its three-dimensional porous structure can achieve deep wetting and physical anchoring of the resin matrix. At the same time, it forms a strong bonding interface with the reinforcing fiber and resin matrix through chemical bonding, which significantly improves the interfacial strength and overall mechanical properties of the composite material. The intrinsic conductivity of the three-dimensional porous carbon material also endows the material with excellent electrical conductivity, ultimately achieving the goal of structural and functional integration of the composite material.

[0022] Specifically, as one aspect of the technical solution of this invention, the preparation method of a modified carbon felt reinforced fiber resin matrix composite material includes:

[0023] A three-dimensional porous carbon material modified carbon felt was prepared by applying benzoxazine resin to the surface of carbon felt and then laser processing.

[0024] Furthermore, the modified carbon felt made of the three-dimensional porous carbon material is composite-laid with reinforcing fibers and resin matrix and cured to obtain a modified carbon felt reinforced fiber resin matrix composite material.

[0025] In some preferred embodiments, the preparation method specifically includes: heating benzoxazine resin to 40~60℃ and holding it at that temperature, then uniformly coating it onto the surface of carbon felt and performing laser treatment to obtain a three-dimensional porous carbon material modified carbon felt; wherein the laser used for the laser treatment is a CO2 laser with a laser power of 5~15 W, a scanning rate of 127~254 mm / s, a Z-axis defocusing distance of 0~5 mm, and a rectangular scanning path.

[0026] Furthermore, the carbon felt includes any one or more combinations of polyacrylonitrile-based carbon felt, viscose-based carbon felt, and pitch-based carbon felt, and is not limited thereto.

[0027] Furthermore, the thickness of the carbon felt is 50~200 μm.

[0028] Furthermore, the three-dimensional porous carbon material modified carbon felt includes carbon felt and three-dimensional porous carbon material grown in situ on the surface of carbon felt, wherein the thickness of the three-dimensional porous carbon material is 5~50 μm.

[0029] Furthermore, the specific surface area of ​​the three-dimensional porous carbon material is 270~370 m². 2 / g, and the surface contains nitrogen and oxygen functional groups.

[0030] Furthermore, the benzoxazine resin was heated to 40~60 ℃ and held for 0.5~2.0 h.

[0031] Furthermore, the benzoxazine resin is heated to 50-55 °C.

[0032] In some preferred embodiments, the preparation method specifically includes: layering the three-dimensional porous carbon material modified carbon felt with reinforcing fibers and impregnating them with a resin matrix, and then subjecting them to curing treatment to obtain a modified carbon felt reinforced fiber resin matrix composite material.

[0033] Furthermore, the reinforcing fiber includes any one or more combinations of glass fiber, high-performance synthetic fiber, and bio-based / natural fiber, and is not limited thereto.

[0034] Furthermore, the glass fiber includes, but is not limited to, alkali-free glass fiber and / or medium-alkali glass fiber.

[0035] Furthermore, the high-performance synthetic fiber includes, but is not limited to, aramid fibers.

[0036] Furthermore, the bio-based / natural fiber includes any one or more combinations of flax fiber, ramie fiber, jute fiber, sisal fiber, bamboo fiber, and cotton fiber, and is not limited thereto.

[0037] Furthermore, the morphology of the reinforcing fiber is selected from any one of fiber cloth, fiber felt, and fiber bundle, but is not limited thereto.

[0038] Furthermore, the resin matrix includes, but is not limited to, epoxy resin and / or vinyl ester resin.

[0039] Furthermore, the epoxy resin includes any one or more combinations of bisphenol A type epoxy resin, bisphenol F type epoxy resin, and alicyclic epoxy resin, and is not limited thereto.

[0040] Furthermore, the curing process is carried out using any one of the following methods: vacuum assisted resin transfer molding (VARTM), resin transfer molding (RTM), or flat vulcanizing machine curing.

[0041] Furthermore, the curing process is carried out at a temperature of 100~120 ℃ for 2~4 h.

[0042] Furthermore, the volume ratio of the three-dimensional porous carbon material modified carbon felt to the reinforcing fiber is 5:100 to 30:100.

[0043] Another aspect of the present invention provides a modified carbon felt reinforced fiber resin matrix composite material prepared by the aforementioned preparation method, comprising: a three-dimensional porous carbon material modified carbon felt as a reinforcing phase, reinforcing fibers, and a resin matrix as a matrix phase; wherein the three-dimensional porous carbon material in the three-dimensional porous carbon material modified carbon felt forms an interlocking structure with the resin matrix and generates an interfacial anchoring effect with the reinforcing fibers.

[0044] In some preferred embodiments, the thickness of the modified carbon felt reinforced fiber resin matrix composite material is 2-4 mm.

[0045] In some preferred embodiments, the specific surface area of ​​the three-dimensional porous carbon material is 270~370 m². 2 / g, and the surface contains nitrogen and oxygen functional groups.

[0046] In some preferred embodiments, the modified carbon felt reinforced fiber resin matrix composite has a conductivity of 7~14.5 S / m.

[0047] Another aspect of the present invention provides the application of the aforementioned modified carbon felt reinforced fiber resin matrix composite material in the field of high mechanical properties and high electrical conductivity integrated lightweight structural materials.

[0048] For example, the carbon felt reinforced fiber resin matrix composite material is used in the fields of intelligent sensing, composite material electrocuring, or low-temperature environment heating and de-icing.

[0049] The technical solution of the present invention will be further described in detail below with reference to several preferred embodiments and accompanying drawings. This embodiment is implemented on the premise of the technical solution of the invention, and provides detailed implementation methods and specific operation processes. However, the protection scope of the present invention is not limited to the following embodiments.

[0050] Unless otherwise specified, the experimental materials used in the examples below can be purchased from conventional biochemical reagent companies. The benzoxazine resins used in this invention can be prepared with reference to Adv. Mater. 2023, 35, 2209545, or purchased from Chengdu Keyi Polymer Technology Co., Ltd. (e.g., CB3, CB7, CB9, CG series, etc.).

[0051] Example 1

[0052] (1) The liquid benzoxazine resin (resin synthesis reference, Adv. Mater. 2023, 35, 2209545) was heated to 55 °C and kept at the temperature for 0.5 h to obtain a homogeneous molten state of benzoxazine resin;

[0053] (2) Take 2 g of the above-mentioned molten benzoxazine and use a pipette to evenly drop it onto the surface of a 230 mm × 130 mm carbon fiber felt (thickness 100 μm). Use a scraper to spread the solution evenly to obtain a carbon fiber felt with benzoxazine resin loaded on the surface.

[0054] (3) The carbon fiber felt was scanned using a CO2 laser processing device. The scanning pattern was set to a rectangle (210mm×110mm), the laser power was 7.5 W, the scanning rate was 190 mm / s, the Z-axis defocus distance was 3 mm, and the laser processing was completed at room temperature and pressure to obtain carbon felt modified with three-dimensional porous carbon material. The specific surface area of ​​the three-dimensional porous carbon material was 310 m². 2 / g, and the surface contains nitrogen and oxygen functional groups.

[0055] (4) The three-dimensional porous carbon material modified carbon felt accounts for 10% of the total volume of glass fiber. The three-dimensional porous carbon material modified carbon felt and alkali-free glass fiber cloth (200mm×100mm, 100μm thickness) are alternately layered to form a preform. The preform is placed in a VARTM molding mold, bisphenol A type epoxy resin matrix is ​​injected, sealed and vacuumed to -0.09 MPa, heated to 100 ℃ and cured for 2.5 h. After cooling to room temperature, it is demolded to obtain a three-dimensional porous carbon material modified carbon felt reinforced glass fiber resin matrix composite material (LIG@CFF-GFRP) with a thickness of about 4 mm.

[0056] (5) Performance test results: bending strength 261.47 MPa, bending modulus 19.22 GPa; conductivity 7.46 S / m; no debonding at the interface, thickness uniformity error ±0.1 mm.

[0057] The graph of flexural strength and flexural modulus of composite materials is shown below. Figure 1 As shown; conductivity diagram as shown Figure 2 As shown; the stress and strain change curves during the bending test are as follows. Figure 3 As shown; sample image of the composite material. Figure 4 As shown.

[0058] Example 2

[0059] The difference between this embodiment and Embodiment 1 is that:

[0060] (1) Use RTM-specific molds to control the thickness to 4mm to ensure dimensional stability during the molding process;

[0061] (2) The curing process is RTM process: injection pressure 0.5 MPa, curing at 100 ℃ for 2.5 h.

[0062] (3) Performance test results: Its mechanical properties and electrical conductivity are not significantly different from those of Example 1; and the material layers are tightly bonded, with thickness uniformity error controlled within ±0.1 mm.

[0063] Example 3

[0064] The difference between this embodiment and Embodiment 1 is that:

[0065] (1) Use a special mold for a flat vulcanizing machine to control the thickness to 4 mm to ensure dimensional stability during the molding process;

[0066] (2) The curing process is prepreg hot pressing molding: hot pressing temperature 100 ℃, pressure 2 MPa, curing 2.5 h.

[0067] (3) Performance test results: Its mechanical properties and electrical conductivity are not significantly different from those of Example 1; and the material layers are tightly bonded, with thickness uniformity error controlled within ±0.1 mm.

[0068] Example 4

[0069] The difference between this embodiment and Embodiment 1 is that:

[0070] (1) The laser power was 6.5 W, and the other parameters remained unchanged. The final composite material thickness was 4.0 mm.

[0071] (2) The specific surface area of ​​the three-dimensional porous carbon material is 270 m². 2 / g, and the surface contains nitrogen and oxygen functional groups.

[0072] (3) Performance test results: Its mechanical properties showed no significant difference from those of Example 1, and its conductivity was 8.39 S / m; the material layers were tightly bonded, and the thickness uniformity error was controlled within ±0.1 mm.

[0073] Example 5

[0074] The difference between this embodiment and Embodiment 1 is that:

[0075] (1) The laser power is 7 W, and the other parameters remain unchanged. The final composite material thickness is 4.0 mm.

[0076] (2) The specific surface area of ​​the three-dimensional porous carbon material is 367 m². 2 / g, and the surface contains nitrogen and oxygen functional groups.

[0077] (3) Performance test results: Its mechanical properties showed no significant difference from those of Example 1, and its conductivity was 7.89 S / m; the material layers were tightly bonded, and the thickness uniformity error was controlled within ±0.1 mm.

[0078] Example 6

[0079] The difference between this embodiment and Embodiment 1 is that:

[0080] (1) The fiber used is aramid fiber, and the final composite material thickness is 4.0 mm.

[0081] (2) Performance test results: bending strength 358.41 MPa, bending modulus 33.93 GPa; conductivity 8.97 S / m; no debonding at the interface, thickness uniformity error ±0.1mm.

[0082] Example 7

[0083] The difference between this embodiment and Embodiment 1 is that:

[0084] (1) The fiber used is flax fiber, and the final composite material thickness is 4.0 mm.

[0085] (2) Performance test results: bending strength 245.73 MPa, bending modulus 18.21 GPa; conductivity 10.12 S / m; no debonding at the interface, thickness uniformity error ±0.1 mm.

[0086] Example 8

[0087] The difference between this embodiment and Embodiment 1 is that:

[0088] (1) The carbon felt volume accounts for 15% of the total glass fiber volume, and the final composite material thickness is 4.0 mm.

[0089] (2) Performance test results: bending strength 277.06 MPa, bending modulus 19.59 GPa; conductivity 10.89 S / m; no debonding at the interface, thickness uniformity error ±0.1 mm.

[0090] Example 9

[0091] The difference between this embodiment and Embodiment 1 is that:

[0092] (1) The carbon felt volume accounts for 20% of the total glass fiber volume, and the final composite material thickness is 4.0 mm.

[0093] (2) Performance test results: bending strength 284.36 MPa, bending modulus 20.13 GPa; conductivity 14.16 S / m; no debonding at the interface, thickness uniformity error ±0.1 mm.

[0094] Comparative Example 1

[0095] The difference between this comparative example and Example 1 is that:

[0096] (1) The composite material is a glass fiber resin matrix composite material (GFRP) without added carbon felt;

[0097] (2) Performance test results: flexural strength 238.42 MPa, flexural modulus 15.67 GPa; conductivity 0 S / m (due to its low conductivity, it is considered an insulating material); no interface debonding, thickness uniformity error ±0.1 mm. The flexural strength and flexural modulus of the composite material are shown in the figure below. Figure 1 As shown; conductivity diagram as shown Figure 2 As shown; the stress and strain change curves during the bending test are as follows. Figure 3 As shown.

[0098] Comparative Example 2

[0099] The difference between this comparative example and Example 1 is that:

[0100] (1) The composite material is a glass fiber resin matrix composite material (CFF-GFRP) prepared using unmodified original carbon felt.

[0101] (2) Performance test results: flexural strength 256.84 MPa, flexural modulus 16.77 GPa; conductivity 1.59 S / m; no debonding at the interface, thickness uniformity error ±0.1 mm. The flexural strength and flexural modulus of the composite material are shown in the figure below. Figure 1 As shown; conductivity diagram as shown Figure 2 As shown; the stress and strain change curves during the bending test are as follows. Figure 3 As shown.

[0102] Comparative Example 3

[0103] The difference between this comparative example and Example 1 is that:

[0104] (1) The composite material is an aramid fiber resin-based composite material without added carbon felt;

[0105] (2) Performance test results: flexural strength 315.42 MPa, flexural modulus 26.84 GPa; conductivity 0 S / m (due to the low conductivity, it is considered an insulating material); no debonding at the interface, thickness uniformity error ±0.1mm.

[0106] Comparative Example 4

[0107] The difference between this comparative example and Example 1 is that:

[0108] (1) The composite material is a flax fiber resin-based composite material without added carbon felt;

[0109] (2) Performance test results: flexural strength 185.37 MPa, flexural modulus 12.57 GPa; conductivity 0 S / m (due to the low conductivity, it is considered an insulating material); no debonding at the interface, thickness uniformity error ±0.1mm.

[0110] In addition, the inventors of this case also conducted experiments with other raw materials, process operations, and process conditions described in this specification, referring to the aforementioned embodiments, and obtained relatively ideal results in all cases.

[0111] It should be understood that the technical solutions of the present invention are not limited to the specific embodiments described above. Any technical modifications made to the technical solutions of the present invention without departing from the spirit and scope of the claims are within the scope of protection of the present invention.

Claims

1. A method for preparing a modified carbon felt reinforced fiber resin matrix composite material, characterized in that, include: A three-dimensional porous carbon material modified carbon felt was prepared by applying benzoxazine resin to the surface of carbon felt and then laser processing. Furthermore, the modified carbon felt made of the three-dimensional porous carbon material is composite-laid with reinforcing fibers and resin matrix and cured to obtain a modified carbon felt reinforced fiber resin matrix composite material.

2. The preparation method according to claim 1, characterized in that, Specifically, it includes: Benzoxazine resin was heated to 40~60 ℃ and kept at that temperature, then uniformly coated onto the surface of carbon felt and subjected to laser treatment to obtain a three-dimensional porous carbon material modified carbon felt; wherein, the laser used for the laser treatment was a CO2 laser with a laser power of 5~15 W, a scanning rate of 127~254 mm / s, a Z-axis defocus distance of 0~5 mm, and a rectangular scanning path.

3. The preparation method according to claim 2, characterized in that: The carbon felt includes any one or more combinations of polyacrylonitrile-based carbon felt, viscose-based carbon felt, and pitch-based carbon felt. And / or, the thickness of the carbon felt is 50~200 μm; And / or, the three-dimensional porous carbon material modified carbon felt includes carbon felt and three-dimensional porous carbon material grown in situ on the surface of carbon felt, wherein the thickness of the three-dimensional porous carbon material is 5~50 μm; And / or, the specific surface area of ​​the three-dimensional porous carbon material is 270~370 m². 2 / g, and the surface contains nitrogen and oxygen functional groups.

4. The preparation method according to claim 2, characterized in that: The benzoxazine resin is heated to 40-60 °C and held at that temperature for 0.5-2.0 h; preferably, the benzoxazine resin is heated to 50-55 °C.

5. The preparation method according to claim 1, characterized in that, Specifically, it includes: The modified carbon felt and reinforcing fibers of the three-dimensional porous carbon material are layered and impregnated with a resin matrix, and then cured to obtain a modified carbon felt reinforced fiber resin matrix composite material.

6. The preparation method according to claim 5, characterized in that: The reinforcing fiber includes any one or more combinations of glass fiber, high-performance synthetic fiber, and bio-based / natural fiber; preferably, the glass fiber includes alkali-free glass fiber and / or medium-alkali glass fiber; preferably, the high-performance synthetic fiber includes aramid fiber; preferably, the bio-based / natural fiber includes any one or more combinations of flax fiber, ramie fiber, jute fiber, sisal fiber, bamboo fiber, and cotton fiber. And / or, the morphology of the reinforcing fibers is selected from any one of fiber cloth, fiber felt, and fiber bundle; And / or, the resin matrix comprises epoxy resin and / or vinyl ester resin; preferably, the epoxy resin comprises any one or more combinations of bisphenol A type epoxy resin, bisphenol F type epoxy resin, and alicyclic epoxy resin.

7. The preparation method according to claim 5, characterized in that: Curing is performed using any one of the following methods: vacuum-assisted resin transfer molding, resin transfer molding, or flat vulcanizing machine curing. And / or, the curing treatment is performed at a temperature of 100~120 ℃ for 2~4 h; And / or, the volume ratio of the three-dimensional porous carbon material modified carbon felt to the reinforcing fiber is 5:100 to 30:

100.

8. The modified carbon felt reinforced fiber resin matrix composite material prepared by the preparation method according to any one of claims 1-7, characterized in that, include: Three-dimensional porous carbon materials modified carbon felt, reinforcing fibers, and resin matrix as the matrix phase; The three-dimensional porous carbon material in the modified carbon felt forms an interlocking structure with the resin matrix and creates an interfacial anchoring effect with the reinforcing fibers.

9. The modified carbon felt reinforced fiber resin matrix composite material according to claim 8, characterized in that: The thickness of the modified carbon felt reinforced fiber resin matrix composite material is 2~4 mm; And / or, the conductivity of the modified carbon felt reinforced fiber resin matrix composite material is 7~14.5 S / m.

10. The application of the modified carbon felt reinforced fiber resin matrix composite material according to claim 8 or 9 in the field of high mechanical properties and high conductivity integrated lightweight structural materials; preferably, the application of the carbon felt reinforced fiber resin matrix composite material in the fields of intelligent sensing, composite material electrocuring or low-temperature environment heating and de-icing.

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