Resin-based composite material and preparation method thereof

Abstract

The invention relates to a resin-based composite material and a preparation method thereof. The resin-based composite material comprises a thermoplastic film body and a resin-based prepreg layer, the thermoplastic film body is arranged between any adjacent resin-based prepreg layers; the resin-based prepreg layer comprises thermoplastic toughening particles. Through the synergistic effect of the thermoplastic film body and the thermoplastic toughening particles, expansion of cracks between layers of the resin-based composite material can be effectively inhibited, brittle fracture of the composite material is prevented, and the interlayer toughness and impact resistance of the resin-based composite material can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of composite materials technology, and in particular to a resin-based composite material and its preparation method. Background Technology

[0002] Resin-based prepregs are prepregs made by impregnating carbon fibers with resin as the matrix, and can be used to prepare carbon fiber composites. Resin-based prepregs possess properties such as light weight, high strength, good toughness, resistance to high and low temperatures, and excellent fatigue or wear resistance, and are commonly used in high-tech fields such as aerospace. However, due to the high cross-linking density and high molecular chain rigidity that occur after resin curing, carbon fiber composites prepared from resin-based prepregs are prone to brittle fracture under impact, limiting their application in load-bearing structural components. Summary of the Invention

[0003] To address the aforementioned technical problems, this application provides a resin-based composite material and its preparation method, which can improve the toughness and damage tolerance of the composite material and prevent it from undergoing brittle fracture under impact.

[0004] According to a first aspect of this application, a resin-based composite material is provided, the resin-based composite material comprising a thermoplastic film and a resin-based prepreg layer, the thermoplastic film being disposed between any adjacent resin-based prepreg layers; The resin-based prepreg layer includes thermoplastic toughening particles.

[0005] In some embodiments of this application, the resin-based prepreg layer includes a resin film layer and a carbon fiber layer; The resin film layer covers the carbon fiber layer and fills the gaps within the carbon fiber layer; The resin film layer also includes thermoplastic toughening particles; The mass ratio of the thermoplastic toughening particles to the resin in the resin film is 0.008 to 0.029.

[0006] In some embodiments of this application, the ratio of the average particle size of the thermoplastic toughening particles to the thickness of the thermoplastic film is 0.20 to 1.67.

[0007] In some embodiments of this application, the basis weight of the resin film is 50~61 g / m³. 2 The basis weight of the carbon fiber layer is 199~235 g / m³. 2 The thickness of the thermoplastic film is 9~25μm.

[0008] In some embodiments of this application, the resin film layer comprises the following raw materials by weight percentage: Bismaleimide monomer 58.14wt%~82.57wt%; Allyl compounds: 6.35 wt% ~ 17.39 wt%; Phenolic compounds: 1.59 wt%~11.59 wt%; Epoxy resin 6.67wt%~18.67wt%; Thermoplastic toughening particles: 0.79wt%~2.90wt%; The mass ratio of the epoxy resin to the thermoplastic toughening particles is C1 = 3.37~14.70.

[0009] In some embodiments of this application, the thermoplastic film comprises the following raw materials by weight percentage: Epoxy monomers: 37.5 wt%~75.8 wt%; Monofunctional amines: 10.0 wt%~32.6 wt%; Viscosity reducer 10.0wt%~32.6wt%; The mass ratio of the epoxy monomer to the viscosity reducer is C2 = 1.07~8.00; The ratio of the sum of the mass fractions of the epoxy monomer and the monofunctional amine to the mass fraction of the viscosity reducer is C3 = 2.07~9.00.

[0010] In some embodiments of this application, the glass transition temperature of the thermoplastic film is between 80 and 100°C.

[0011] According to a second aspect of this application, a method for preparing a resin-based composite material is provided, the method being used to prepare the resin-based composite material as described in any of the above-described methods, the method comprising: The resin-based prepreg layers are laid out in the layup sequence; the thermoplastic film is placed between any two adjacent resin-based prepreg layers; and the resin-based composite material is cured under a first preset condition.

[0012] In some embodiments of this application, the preparation method further includes: The thermoplastic film raw material is subjected to a second preset condition to obtain a first reactant, and the first reactant is hot-pressed under a third preset condition to obtain the thermoplastic film; and / or The resin film layer is coated onto the surface of the carbon fiber layer, so that the resin film layer wets the carbon fiber layer; under the fourth preset condition, the resin-based prepreg is obtained by pressing.

[0013] In some embodiments of this application, the first preset conditions include: heating to 130-180°C at a curing pressure of 0.4-0.8 MPa and a heating rate of 1.5-2.5°C / min; holding the temperature for curing for 0.5-1.5 hours; continuing to heat to 170-210°C and holding the temperature for curing for 1.5-3.0 hours; further heating to 210-250°C and holding the temperature for curing for 3.5-5.5 hours; and / or The second preset conditions include: a reaction temperature of 145~150℃, stirring for 4.5~5.5h, cooling and drying, washing with methanol, and then vacuum drying; and / or The third preset condition includes: hot pressing temperature of 140℃~160℃; hot pressing pressure of 250~350MPa; and / or The fourth preset condition includes: the pressing temperature is 90~100℃.

[0014] The technical solution provided in this application can include the following beneficial effects: Through the synergistic effect of thermoplastic film and thermoplastic toughening particles, this application can effectively inhibit the propagation of cracks between layers of resin-based composite materials and prevent brittle fracture of composite materials, thereby improving the interlayer toughness and impact resistance of resin-based composite materials.

[0015] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0017] Figure 1 This is a schematic diagram of the interlayer structure of a resin-based composite material according to an exemplary embodiment.

[0018] Figure 2 This is a schematic diagram of the interlayer structure of a resin-based prepreg according to an exemplary embodiment. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with the embodiments and accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0020] Resin-based prepregs are prepregs formed by impregnating carbon fibers with resin as the matrix, and they can be used to prepare carbon fiber composites. Resin-based prepregs possess properties such as light weight, high strength, good toughness, resistance to high and low temperatures, and excellent fatigue and wear resistance. Carbon fiber composites prepared from resin-based prepregs are often used in the manufacture of aircraft structural components. However, due to the high cross-linking density and high molecular chain rigidity that occur after resin curing, carbon fiber composites prepared from resin-based prepregs are prone to brittle fracture under impact, limiting their application in primary load-bearing structural components.

[0021] Based on this, this application provides a resin-based composite material comprising a thermoplastic film and resin-based prepreg layers, wherein the thermoplastic film is disposed between any adjacent resin-based prepreg layers; the resin-based prepreg layers include thermoplastic toughening particles. By disposing of the thermoplastic film between any adjacent resin-based prepreg layers, a macroscopic plastic deformation zone is formed between the resin-based prepreg layers. The thermoplastic film absorbs and dissipates the energy required for crack propagation through plastic deformation, and prevents cracks from penetrating between the brittle resin-based prepreg layers by deflecting the cracks and bridging them. Thermoplastic toughening particles are also disposed in the resin-based prepreg layers. The thermoplastic toughening particles are dispersed in the resin-based prepreg layers, and the microscopic thermoplastic toughening particles can be stretched or fractured, forming a bridging structure between the resin-based prepreg layers, blocking crack propagation, or deflecting the cracks during propagation, thereby absorbing and dispersing external stress. In this application, the thermoplastic film and thermoplastic toughening particles form a dual toughening system. The macroscopic thermoplastic film and microscopic thermoplastic toughening particles can create a wider and more continuous plastic deformation zone, as well as more crack deflection and bridging paths. This synergistically absorbs and disperses external stress, further improving the fracture toughness and impact damage tolerance of the resin-based composite material while maintaining its strength, thus enhancing its toughness and reliability. This meets the requirements for resin-based composite materials in relevant fields, such as aerospace.

[0022] The specific embodiments described below are intended to help those skilled in the art understand this embodiment, but this embodiment is not limited to the specific embodiments described below.

[0023] like Figure 1 As shown, an exemplary embodiment of this application provides a resin-based composite material, which includes a resin-based prepreg layer 1 and a thermoplastic film 2, wherein the thermoplastic film 2 is disposed between any adjacent resin-based prepreg layers 1; the resin-based prepreg layer 1 includes thermoplastic toughening particles.

[0024] In the exemplary embodiments of this disclosure, a resin-based composite material is formed by providing a thermoplastic film 2 between any adjacent resin-based prepreg layers 1. When the resin-based composite material is subjected to external stress, the thermoplastic film 2 between the resin-based prepreg layers 1 absorbs and dissipates the energy required for crack propagation through plastic deformation. Furthermore, it prevents crack propagation between the brittle resin-based prepreg layers 1 by deflecting or bridging the cracks, thereby improving the interlaminar fracture toughness and impact resistance of the resin-based composite material. Simultaneously, by dispersing thermoplastic toughening particles in the resin-based prepreg layers 1, crack propagation within the resin-based prepreg layers 1 can be blocked or deflected by the thermoplastic toughening particles, further preventing crack propagation between the resin-based prepreg layers 1. The thermoplastic film 2 and the thermoplastic toughening particles in the resin-based prepreg layer 1 form a dual toughening system. The macroscopic thermoplastic film 2 and the microscopic thermoplastic toughening particles form a wider and more continuous plastic deformation zone, as well as more crack deflection and bridging paths. They synergistically absorb and disperse external stress, effectively improving the fracture toughness and impact damage tolerance of the resin-based composite material while maintaining its strength, and further improving the toughness and reliability of the resin-based composite material.

[0025] In the exemplary embodiments of this disclosure, the thermoplastic toughening particles can undergo plastic deformation when subjected to external stress to absorb and disperse the external stress. The thermoplastic toughening particles can be any thermoplastic toughening particles capable of achieving the effects of the exemplary embodiments of this disclosure. For example, the thermoplastic toughening particles can be polydodecanoic acid particles or polyethersulfone particles. The thermoplastic toughening particles can also be a mixture of various of the above-mentioned thermoplastic particles.

[0026] In the exemplary embodiments of this disclosure, the particle size of the thermoplastic toughening particles can be set according to actual needs. For example, the average particle size of the thermoplastic toughening particles is 5~15μm. For example, the average particle size of the thermoplastic toughening particles can be 8μm, 10μm, 12μm, or any value between the exemplary average particle sizes. For example, the average particle size of the thermoplastic toughening particles can also be any value between 8 and 12μm.

[0027] In the exemplary embodiments of this disclosure, a resin-based composite material is formed by providing a thermoplastic film 2 between any adjacent resin-based prepreg layers 1. When the resin-based composite material is subjected to external stress, the thermoplastic film 2 between the resin-based prepreg layers 1 absorbs and dissipates the energy required for crack propagation through plastic deformation. Furthermore, it prevents crack propagation between the brittle resin-based prepreg layers 1 by deflecting or bridging the cracks, thereby improving the fracture toughness and impact damage tolerance of the resin-based composite material. Simultaneously, by dispersing thermoplastic toughening particles in the resin-based prepreg layers 1, crack propagation within the resin-based prepreg layers 1 can be blocked or deflected by the thermoplastic toughening particles, further preventing crack propagation between the resin-based prepreg layers 1. In the exemplary embodiments of this disclosure, a thermoplastic film is provided between any adjacent resin-based prepreg layers 1, and thermoplastic toughening particles are dispersed in the resin-based prepreg layers 1, thereby forming a thermoplastic dual toughening system in the resin-based composite material. The macroscopic thermoplastic film 2 and the microscopic thermoplastic toughening particles form a wider and more continuous plastic deformation zone, as well as more crack deflection and bridging paths, thereby synergistically enhancing the fracture toughness and impact resistance of the resin-based composite material.

[0028] like Figure 2 As shown, in an exemplary embodiment of this disclosure, the resin-based prepreg layer 1 includes a resin film layer 3 and a carbon fiber layer 5; the resin film layer 3 covers the carbon fiber layer 5 and fills the gaps within the carbon fiber layer 5; the resin film layer 3 includes thermoplastic toughening particles 4; the mass ratio of the thermoplastic toughening particles to the resin in the resin film layer 3 is 0.008 to 0.029.

[0029] In this embodiment, the carbon fiber in carbon fiber layer 5 can be selected according to the product requirements, such as T300, T700, and T800.

[0030] In this embodiment, the resin-based prepreg layer 1 is formed by pressing a resin film layer 3 and a carbon fiber layer 5 together. The resin film layer 3 is applied to the surface of the carbon fiber layer 5, so that the resin film layer 3 impregnates the carbon fiber layer 5, and the resin film layer 3 and the carbon fiber layer 5 are pressed together by a hot roller impregnation method.

[0031] In this embodiment, the mass ratio of thermoplastic toughening particles 4 to resin in the resin film layer 3 is 0.008~0.029. To ensure that the thermoplastic toughening particles 4 can effectively prevent crack propagation within the resin prepreg layer 1 or redirect cracks through their thermoplastic deformation when the resin-based composite material is subjected to external stress, without affecting the corresponding properties of the resin film layer 3, it is necessary to control the mass ratio of thermoplastic toughening particles 4 to resin in the resin film layer 3. For example, the mass ratio of thermoplastic toughening particles 4 to resin in the resin film layer 3 can be set to 0.008~0.029. The mass ratio of thermoplastic toughening particles 4 to resin in the resin film layer 3 can be 0.010, 0.018, 0.022, 0.026, or any of the exemplary mass ratios. For example, the mass ratio of thermoplastic toughening particles 4 to resin in the resin film layer 3 can be any ratio between 0.018 and 0.026.

[0032] In the exemplary embodiments of this disclosure, the ratio between the average particle size of the thermoplastic toughening particles 4 and the thickness of the thermoplastic film 2 can be set according to actual needs. For example, the ratio of the average particle size of the thermoplastic toughening particles 4 to the thickness of the thermoplastic film 2 can be 0.2 to 1.67. To ensure that the thermoplastic toughening particles 4 and the thermoplastic film 2 can form an effective dual toughening system when the resin-based composite material is subjected to external stress, and to avoid the inability to form a stable "bridging-anchoring" dual toughening system due to the particle size of the thermoplastic toughening particles being much smaller than the thickness of the thermoplastic film 2, thus failing to achieve effective crack deflection, and to avoid stress concentration caused by the average particle size of the thermoplastic toughening particles 4 being much larger than the thickness of the thermoplastic film 2, which would lead to a decrease in toughening efficiency, it is necessary to control the ratio between the average particle size of the thermoplastic toughening particles 4 and the thickness of the thermoplastic film 2. For example, the ratio of the average particle size of the thermoplastic toughening particles 4 to the thickness of the thermoplastic film 2 can be set to 0.2 to 1.67. The ratio of the average particle size of the thermoplastic toughening particles 4 to the thickness of the thermoplastic film 2 can be 0.4, 0.6, 0.9, 1.23, 1.46, or 1.65. The ratio of the average particle size of the thermoplastic toughening particles 4 to the thickness of the thermoplastic film 2 can also be any ratio between the exemplary mass ratios. For example, the ratio of the average particle size of the thermoplastic toughening particles 4 to the thickness of the thermoplastic film 2 can be any ratio between 0.6 and 0.165.

[0033] In the exemplary embodiments disclosed herein, the basis weight of the resin film layer 3 is 50~61 g / m³. 2 The basis weight of carbon fiber layer 5 is 199~235 g / m². 2The thickness of the thermoplastic film 2 is 9~25μm. In this embodiment, the resin-based composite material is formed by pressing multiple layers of resin-based prepreg 1, and a thermoplastic film 2 is disposed between any adjacent resin-based prepreg layers 1. In order to achieve the corresponding performance of the resin-based composite material, it is necessary to determine the basis weight relationship between the carbon fiber layer 5 and the resin film layer 3 in the resin-based prepreg layer 1 so as to effectively achieve the corresponding performance of the resin-based composite material. After determining the basis weight relationship between the carbon fiber layer 5 and the resin film layer 3, the thickness of the thermoplastic film 2 can be considered based on the established resin-based prepreg layer 1.

[0034] If the thickness of the thermoplastic film 2 is too low, it will not be able to form a continuous and effective plastic deformation zone, and its ability to absorb energy will be limited, resulting in an insignificant toughening effect. If the thickness of the thermoplastic film 2 is too high, an excessively thick thermoplastic resin layer will be formed between the resin-based prepreg layer 1, which will reduce the overall strength of the resin-based composite material and even cause delamination. At the same time, the heat resistance of the resin-based composite material will also be reduced.

[0035] In this embodiment, the basis weight of the resin film layer 3 is 50~61 g / m³. 2 And the basis weight of carbon fiber layer 5 is 199~235g / m. 2 In this case, the thickness of the thermoplastic film 2 can be set to 9~25μm. This setting takes into account the corresponding properties of the resin-based composite material and can effectively prevent crack propagation between the layers of the brittle resin-based prepreg layer 1, thereby improving the fracture toughness and impact damage tolerance of the resin-based composite material. At the same time, it can avoid the decrease in interlayer adhesion between the thermoplastic film 2 and the resin-based prepreg layer 1, and the occurrence of delamination.

[0036] In this embodiment, the basis weight of the resin film layer 3 can be 51 g / m³. 2 55g / m 2 58g / m 2 60g / m 2 The basis weight of the resin film layer 3 can also be any value between the exemplary basis weights, for example, the basis weight of the resin film layer 3 can be 55~60 g / m³. 2 Any value between.

[0037] The basis weight of carbon fiber layer 5 can be 204 g / m. 2 215g / m 2 221g / m 2 232g / m 2 The basis weight of carbon fiber layer 5 can be any value between the exemplary basis weights, for example, the basis weight of carbon fiber layer 5 can be 215~232 g / m³. 2 Any value between.

[0038] The thickness of the thermoplastic film 2 can be 12μm, 16μm, 18μm, or 21μm. The thickness of the thermoplastic film 2 can be any value between the exemplary thicknesses. For example, the thickness of the thermoplastic film 2 can be any value between 16 and 21μm.

[0039] For example, in one embodiment, the basis weight of the resin film layer 3 is 50 g / m³. 2 The basis weight of carbon fiber layer 5 is 199 g / m². 2 The thickness of thermoplastic film 2 is 9 μm.

[0040] In another embodiment, the basis weight of the resin film layer 3 is 51 g / m³. 2 The basis weight of carbon fiber layer 5 is 206 g / m². 2 The thickness of thermoplastic film 2 is 13 μm.

[0041] In another embodiment, the basis weight of the resin film layer 3 is 54 g / m³. 2 The basis weight of carbon fiber layer 5 is 210 g / m². 2 The thickness of thermoplastic film 2 is 15 μm.

[0042] In another embodiment, the basis weight of the resin film layer 3 is 60 g / m³. 2 The basis weight of carbon fiber layer 5 is 216 g / m². 2 The thickness of thermoplastic film 2 is 24 μm.

[0043] In one exemplary embodiment, the resin film layer 3 comprises, by weight percentage, the following raw materials: Bismaleimide monomer 58.14wt%~82.57wt%; Allyl compounds: 6.35 wt% ~ 17.39 wt%; Phenolic compounds: 1.59 wt%~11.59 wt%; Epoxy resin 6.67wt%~18.67wt%; Thermoplastic toughening particles: 0.79wt%~2.90wt%; The mass ratio of epoxy resin to thermoplastic toughening particles is C1 = 3.37~14.70.

[0044] Bismaleimide resin possesses excellent mechanical properties, heat resistance, and stability, making it suitable as a material for forming resin film layer 3. However, unmodified bismaleimide resin exhibits high crosslinking density after curing, resulting in high brittleness and weak interlaminar fracture toughness and impact resistance. Therefore, in this embodiment, an allyl compound is added. The allyl compound undergoes an addition reaction with the bismaleimide monomer, and the retained allyl side chains after the reaction reduce the crosslinking density, thereby improving the interlaminar toughness and impact resistance of the bismaleimide resin. Higher allyl compound content leads to better interlaminar toughness and impact resistance of the bismaleimide resin; however, excessive addition of allyl compound can cause an excessive decrease in the glass transition temperature of the bismaleimide resin, impairing its thermal stability. Therefore, in this embodiment, the allyl compound content can be 6.35 wt% to 17.39 wt%.

[0045] In this embodiment, phenolic compounds are also added. These compounds copolymerize with bismaleimide monomers to introduce flexible phenol-bismaleimide segments, which absorb external impact stress, inhibit crack propagation, improve the fracture toughness of the resin-based composite material, and enhance the adhesion between the resin film layer 3 and the carbon fiber layer 5. However, excessive phenolic compound content can affect the strength of the resin-based composite material. Therefore, in this embodiment, the phenolic compound content can be 1.59 wt% to 11.59 wt%.

[0046] In this embodiment, epoxy resin is used as a modifier. Its epoxy groups undergo ring-opening to generate a hydroxyl-ether intermediate. This intermediate reacts with the C=C double bond in the bismaleimide monomer to form a flexible segment. This flexible segment further crosslinks with other epoxy groups or bismaleimide monomers, improving both the interlaminar toughness of the bismaleimide resin and the interlaminar adhesion and flowability of the resin-based composite material. However, excessive epoxy resin addition, while further improving the interlaminar toughness of the resin-based composite material, leads to a decrease in the glass transition temperature of the bismaleimide resin, impaired thermal stability, and reduced interlaminar adhesion, thus affecting the strength of the resin-based composite material. Therefore, in this embodiment, the epoxy resin content can be 6.67wt%~18.67wt%.

[0047] In this embodiment, the thermoplastic toughening particles 4 are dispersed within the resin film layer 3 during its formation. When the resin-based composite material is subjected to external stress, they prevent crack propagation by blocking or redirecting the cracks during their propagation process, thereby absorbing and dispersing the external stress. However, low addition amounts result in limited toughening effects, while excessive addition can easily lead to particle agglomeration and delamination, which is detrimental to the wetting of the carbon fibers in the carbon fiber layer 5 by the resin film layer 3. Therefore, in this embodiment, the content of the thermoplastic toughening particles 4 can be from 0.79wt% to 2.90wt%.

[0048] In this embodiment, the mass ratio of epoxy resin to thermoplastic toughening particles 4 is C1 = 3.37~14.70.

[0049] In this embodiment, to enable the epoxy resin to react with the bismaleimide monomer to form a bismaleimide resin containing flexible segments, effectively improving the interlaminar toughness of the resin-based composite material, while not affecting the uniform dispersion of the thermoplastic toughening particles 4 between the resin film layers 3, so that when the resin-based composite material is subjected to external stress, it is necessary to control the mass ratio of epoxy resin to thermoplastic toughening particles 4. For example, the mass ratio of epoxy resin to thermoplastic toughening particles 4 can be set to C1 = 3.37~14.70. The mass ratio of epoxy resin to thermoplastic toughening particles 4 can be 4.0, 8.0, 12.0, 14.0, or any of the exemplary mass ratios, such as any ratio between 8.0 and 12.0.

[0050] In this exemplary embodiment, by adjusting the proportions of the components of bismaleimide monomer, allyl compound, phenolic compound, epoxy resin and thermoplastic toughening particles 4 to form resin film layer 3, the resin-based prepreg layer 1 prepared from resin film layer 3 has excellent interlayer toughness and impact resistance.

[0051] For example, in the following embodiments (corresponding to Embodiment 1 in Table 1), the resin film layer comprises the following raw materials by weight percentage: Bismaleimide monomer 75.27 wt%; Allyl compounds 8.60 wt%; Phenolic compounds 4.30 wt%; Epoxy resin 10.75 wt%; Thermoplastic toughening particles 1.08 wt%; The mass ratio of epoxy resin to thermoplastic toughening particles, C1, is 9.95.

[0052] In this embodiment, the type I interlaminar fracture toughness of the resin-based composite material is 459 J / m. 2 The interlaminar fracture toughness of II is 1253 J / m. 2 The compressive strength after impact is 265 MPa.

[0053] In the following examples (corresponding to Example 2 in Table 1), the resin film layer comprises the following raw materials by weight percentage: Bismaleimide monomer 65.07 wt%; Allyl compounds 10.80 wt%; Phenolic compounds 7.60 wt%; Epoxy resin 14.35 wt%; Thermoplastic toughening particles 2.18 wt%; The mass ratio of epoxy resin to thermoplastic toughening particles is C1 = 6.58.

[0054] In this embodiment, the type I interlaminar fracture toughness of the resin-based composite material is 422 J / m. 2 The interlaminar fracture toughness of II is 1231 J / m. 2 The compressive strength after impact is 271 MPa.

[0055] In the following examples (corresponding to Example 5 in Table 1), the resin film layer comprises the following raw materials by weight percentage: Bismaleimide monomer 82.57 wt%; Allyl compounds 8.30 wt%; Phenolic compounds 1.67 wt%; Epoxy resin 6.67 wt%; Thermoplastic toughening particles 0.79 wt%; The mass ratio of epoxy resin to thermoplastic toughening particles, C1, is 8.44.

[0056] In this embodiment, the type I interlaminar fracture toughness of the resin-based composite material is 439 J / m. 2 The interlaminar fracture toughness of II is 1397 J / m. 2 The compressive strength after impact is 276 MPa.

[0057] In this embodiment, the allyl compound and the phenolic compound can be any compound containing an allyl group or a phenolic hydroxyl group that can achieve the effects of the exemplary embodiments of this disclosure. For example, the allyl compound can be diallyl bisphenol A, diallyl bisphenol S, or diallyl bisphenol F; the allyl compound can also be a mixture of various allyl compounds mentioned above; the phenolic compound can be phenol.

[0058] In this embodiment, the epoxy resin can be any epoxy resin capable of achieving the effects of the exemplary embodiments of this disclosure. For example, the epoxy resin can be bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, epoxy ester, or polyphenolic glycidyl ether. The epoxy resin can also be a mixture of various epoxy resins mentioned above.

[0059] In one exemplary embodiment, the thermoplastic film 2 comprises, by weight percentage, the following raw materials: Epoxy monomers: 37.5 wt%~75.8 wt%; Monofunctional amines: 10.0 wt%~32.6 wt%; Viscosity reducer 10.0wt%~32.6wt%; The mass ratio of epoxy monomer to viscosity reducer is C2 = 1.07~8.00; The ratio of the sum of the mass fractions of epoxy monomers and monofunctional amines to the mass fraction of viscosity reducer is C3 = 2.07~9.00.

[0060] Epoxy monomers can undergo addition reactions with monofunctional amines to obtain epoxy amine compounds. In the monofunctional amine reaction system, linear or low-crosslinked networks with flexible segments can be obtained to obtain thermoplastic film 2, and the glass transition temperature of thermoplastic film 2 is reduced, so that thermoplastic film 2 can remain in a rubber state within the working temperature range, absorb and disperse external stress, prevent crack propagation, and improve the interlaminar toughness and impact resistance of resin-based composite materials. The content of epoxy monomers and monofunctional amines are the decisive factors in the introduction of flexible segments. When the epoxy monomer content is too high and the monofunctional amine content is too low, although the thermoplastic film 2 has a low degree of crosslinking, enhanced thermoplasticity, and a lower glass transition temperature, the insufficient crosslinking and low glass transition temperature make the thermoplastic film 2 prone to a decrease in mechanical strength and thermal stability, thus affecting the mechanical strength and thermal stability of the resin-based composite material. When the epoxy monomer content is too low and the monofunctional amine content is too high, it is easy to form a thermosetting material with high crosslinking density and high glass transition temperature, which is not conducive to improving the interlaminar toughness and impact resistance of the resin-based composite material. Therefore, in this embodiment, the epoxy monomer content can be 37.5wt%~75.8wt%; the monofunctional amine content can be 10.0wt%~32.6wt%.

[0061] In this embodiment, a viscosity reducer is also added. The viscosity reducer can catalyze the reaction between the epoxy monomer and the monofunctional amine to accelerate the reaction rate. Simultaneously, it can reduce the viscosity of the thermoplastic film 2 and improve its fluidity, ensuring a uniform thickness of the resulting thermoplastic film 2 and avoiding localized stress concentration. However, excessive viscosity reducer content can weaken the mechanical strength of the thermoplastic film 2. Therefore, in this embodiment, the viscosity reducer content can be 10.0 wt% to 32.6 wt%.

[0062] In this embodiment, the mass ratio of epoxy monomer to monofunctional amine is C2 = 1.07~8.00.

[0063] In this embodiment, the mass ratio of epoxy monomer to monofunctional amine is the main factor affecting the thermoplasticity of the film. To form a thermoplastic film 2 with a low glass transition temperature while maintaining the mechanical strength of the resin-based composite material, and to improve the interlaminar toughness and impact resistance of the resin-based composite material while preserving its mechanical strength, it is necessary to control the mass ratio of epoxy monomer to monofunctional amine. For example, the mass ratio of epoxy monomer to monofunctional amine can be set to C2 = 1.07~8.00. The mass ratio of epoxy monomer to monofunctional amine can be 2.5, 4.5, 5.0, 6.0, or any of the exemplary mass ratios, such as any ratio between 4.5 and 6.0.

[0064] In this embodiment, the ratio of the sum of the mass fractions of epoxy monomer and monofunctional amine to the mass fraction of viscosity reducer is C3 = 2.07~9.00.

[0065] In this embodiment, to catalyze the reaction between the epoxy monomer and the monofunctional amine, thereby accelerating the reaction rate, reducing the viscosity of the thermoplastic film 2, improving its fluidity, ensuring uniform thickness of the thermoplastic film 2, avoiding localized stress concentration, and maintaining the mechanical strength of the thermoplastic film 2, it is necessary to control the ratio of the sum of the masses of the epoxy monomer and the monofunctional amine to the mass of the viscosity reducer. For example, the ratio of the sum of the masses of the epoxy monomer and the monofunctional amine to the mass of the viscosity reducer can be set to C3 = 2.07~9.00. The ratio of the sum of the masses of the epoxy monomer and the monofunctional amine to the mass of the viscosity reducer can be 4.0, 5.0, 6.5, or 7.5, or any ratio among the exemplary mass ratios. For example, the ratio of the sum of the masses of the epoxy monomer and the monofunctional amine to the mass of the viscosity reducer can be any ratio between 5.0 and 7.5.

[0066] In this exemplary embodiment, by adjusting the proportions of the epoxy monomer, monofunctional amine, and viscosity reducer to form a thermoplastic film 2, the resin-based composite material prepared from the thermoplastic film 2 has excellent interlaminar toughness and impact resistance.

[0067] For example, in the following embodiments (corresponding to Embodiment 1 in Table 1), the thermoplastic film comprises the following raw materials by weight percentage: Epoxy monomer 62.5 wt%; Monofunctional amines 18.75 wt%; Viscosity reducer 18.75 wt%; The mass ratio of epoxy monomer to viscosity reducer is C2 = 3.33; The ratio of the sum of the mass fractions of epoxy monomers and monofunctional amines to the mass fraction of viscosity reducer is C3 = 4.33.

[0068] In this embodiment, the type I interlaminar fracture toughness of the resin-based composite material is 459 J / m. 2 The interlaminar fracture toughness of II is 1253 J / m. 2 The compressive strength after impact is 265 MPa.

[0069] In the following embodiments (corresponding to Embodiment 7 in Table 1), the thermoplastic film comprises the following raw materials by weight percentage: Epoxy monomer 37.50 wt%; Monofunctional amines 31.25 wt%; Viscosity reducer 31.25 wt%; The mass ratio of epoxy monomer to viscosity reducer is C2 = 1.20; The ratio of the sum of the mass fractions of epoxy monomers and monofunctional amines to the mass fraction of viscosity reducer is C3 = 2.20.

[0070] In this embodiment, the type I interlaminar fracture toughness of the resin-based composite material is 424 J / m. 2 The interlaminar fracture toughness of II is 1233 J / m. 2 The compressive strength after impact is 265 MPa.

[0071] In the following embodiments (corresponding to Embodiment 10 in Table 1), the thermoplastic film comprises the following raw materials by weight percentage: Epoxy monomer 75.80 wt%; Monofunctional amines 12.10 wt%; Viscosity reducer 12.10 wt%; The mass ratio of epoxy monomer to viscosity reducer is C2 = 6.26; The ratio of the sum of the mass fractions of epoxy monomers and monofunctional amines to the mass fraction of viscosity reducer, C3 = 7.26.

[0072] In this embodiment, the type I interlaminar fracture toughness of the resin-based composite material is 433 J / m. 2 The interlaminar fracture toughness of II is 1340 J / m. 2 The compressive strength after impact is 277 MPa.

[0073] In this embodiment, the epoxy monomer and the monofunctional amine can be any epoxy monomer and monofunctional amine capable of achieving the effects of the exemplary embodiments of this disclosure. For example, the epoxy monomer can be bisphenol A diglycidyl ether, tetrahydroxy-methyl-diamine epoxy monomer, epichlorohydrin; the epoxy monomer can also be a mixture of various epoxy monomers mentioned above; the monofunctional amine can be an aromatic amine or an alkyl amine; the monofunctional amine can be aniline, n-butylamine, cyclohexylamine; the monofunctional amine can also be a mixture of various monofunctional amines mentioned above.

[0074] In this embodiment, the viscosity reducer can be any viscosity reducer capable of achieving the effects of the exemplary embodiments of this disclosure. For example, the viscosity reducer can be propylene glycol methyl ether propionate, propylene glycol methyl ether, or ethyl acetate; the viscosity reducer can also be a mixture of various viscosity reducers mentioned above.

[0075] In an exemplary embodiment, the glass transition temperature of the thermoplastic film 2 is 80~100°C.

[0076] In this embodiment, epoxy monomers undergo an addition reaction with monofunctional amines to obtain epoxy amine compounds. Through the monofunctional amine reaction system, linear or low-crosslinking networks with flexible segments can be introduced to reduce the crosslinking density, thereby lowering the glass transition temperature of the thermoplastic film 2. The viscosity reducer, as a low-molecular-weight flexible diluent, further softens the system and acts as a catalyst to catalyze the reaction between epoxy monomers and monofunctional amines, thereby accelerating the reaction rate. This results in a glass transition temperature of 80~100℃ for the obtained thermoplastic film 2, which can maintain a rubbery state within the operating temperature range. When the resin-based composite material is subjected to external stress, it absorbs and disperses the external stress, preventing crack propagation and thus improving the interlaminar toughness and impact resistance of the resin-based composite material.

[0077] An exemplary embodiment of this application provides a method for preparing a resin-based composite material, used to prepare the resin-based composite material as described above, the method comprising: The resin-based prepreg layers are laid out in the following sequence; the thermoplastic film is placed between any two adjacent resin-based prepreg layers; and the resin-based composite material is cured under a first preset condition.

[0078] In this embodiment, the layup sequence can be selected according to product requirements. For example, the layup sequence can be [45 / 0 / -45 / 90]. 2s It can also be [45 / 0 / -45 / 90] 3s .

[0079] For example, in one embodiment, the layup sequence of the resin-based prepreg layer is [45 / 0 / -45 / 90]. 2s .

[0080] In this embodiment, when laying the resin-based prepreg layer, four layers are sequentially laid in the mold according to the fiber direction of the resin-based prepreg. Along the laying direction of the resin-based prepreg, the fiber direction is sequentially 45° (fiber direction inclined 45° clockwise relative to the mold baseline), 0° (fiber direction parallel to the mold baseline), -45° (fiber direction inclined 45° counterclockwise), and 90° (fiber direction perpendicular to the baseline), forming the first set of four-layer stacks; after completion, according to the... The same four-layer stack is laid in the same order to form two identical four-layer stacks. Then, the top layer of the second set is laid in a mirror sequence, that is, a 90° layer, a -45° layer, a 0° layer and a 45° layer are laid on the 90° layer of the second four-layer stack, so that the entire resin-based prepreg layer is symmetrical in the middle, and finally an 8-layer resin-based prepreg layer with a lamination sequence of 45° / 0° / -45° / 90° / 90° / -45° / 0° / 45° is obtained.

[0081] In another embodiment, the layup sequence of the resin-based prepreg layer is [45 / 0 / -45 / 90]. 3s .

[0082] In this embodiment, when laying the resin-based prepreg layer, four layers are laid sequentially in the mold according to the fiber direction of the resin-based prepreg. Along the laying direction of the resin-based prepreg, the fiber directions are sequentially 45°, 0°, -45°, and 90°, forming the first set of four-layer stacks. This process is repeated three times, with the second and third sets of the same four-layer stacks laid in the same order, forming three sets of stacks with a lamination sequence of 45° / 0° / -45° / 90° / 45° / 0° / -45° / 90° / 45° / 0° / -45° / 90°. Then, the top layer of the third set... The resin-based prepreg is laid in a mirror sequence, that is, on the already laid third set of four stacked 90° layers, a 90° layer, a -45° layer, a 0° layer, and a 45° layer are laid in sequence. This mirror sequence is repeated three times to make the entire resin-based prepreg layer symmetrical in the middle. Finally, a 24-layer resin-based prepreg layer with a lamination sequence of 45° / 0° / -45° / 90° / 45° / 0° / -45° / 90° / 45° / 0° / -45° / 90° / 90° / -45° / 0° / 45° / 90° / -45° / 0° / 90° / -45° / 0° / 90° / -45° / 0° / 90° / -45° / 0° / 90° / -45° / 0° / 45° / 90° / -45° / 0° / 45° is obtained.

[0083] In one exemplary embodiment, the method for preparing the resin-based composite material further includes: The thermoplastic film raw material is subjected to a second preset condition to obtain a first reactant, and the first reactant is hot-pressed under a third preset condition to obtain a thermoplastic film; and / or A resin film layer is coated on the surface of the carbon fiber layer, allowing the resin film layer to impregnate the carbon fiber layer; under the fourth preset condition, the resin-based prepreg is obtained by pressing.

[0084] In this embodiment, the first preset conditions include: heating at a curing pressure of 0.4~0.8MPa and a heating rate of 1.5~2.5℃ / min to 130~180℃; holding for curing for 0.5~1.5h; continuing to heat to 170~210℃ and holding for curing for 1.5~3.0h; further heating to 210~250℃ and holding for curing for 3.5~5.5h; and / or In this embodiment, the second preset conditions include: inert gas protection, reaction temperature of 145~150℃, stirring for 4.5~5.5h, cooling and drying, washing with methanol, and then vacuum drying; and / or In this embodiment, the third preset conditions include: hot pressing temperature of 140℃~160℃; hot pressing pressure of 250~350MPa; In this embodiment, the fourth preset condition includes: a pressing temperature of 90~100℃.

[0085] The resin-based composite material of this application forms a dual toughening system through a thermoplastic film and thermoplastic toughening particles. The macroscopic thermoplastic film and the microscopic thermoplastic toughening particles create a wider and more continuous plastic deformation zone, as well as more crack deflection and bridging paths, synergistically enhancing the fracture toughness and impact resistance of the resin-based composite material. A thermoplastic film is placed between any adjacent resin-based prepreg layers. Through plastic deformation, it absorbs and dissipates the energy required for crack propagation and prevents crack propagation between the brittle resin-based prepreg layers by deflecting and bridging cracks. Simultaneously, thermoplastic toughening particles are dispersed within the resin-based prepreg layers so that cracks are blocked or deflected during propagation within the resin-based prepreg, preventing crack propagation between the resin-based composite layers, thereby improving the fracture toughness and impact damage tolerance of the resin-based composite material.

[0086] To more clearly explain the technical solution of this application, specific embodiments of the preparation method of resin-based composite materials are provided. The thermoplastic film, resin-based prepreg layer, and preparation and evaluation methods of the resin-based composite materials used in each embodiment are described below. The beneficial effects of the above-mentioned resin-based composite material preparation method will be illustrated by specific experimental data provided through specific embodiments.

[0087] Example Example 1 1. Raw materials: Carbon fiber: T800 grade carbon fiber.

[0088] Bismaleimide monomer: 4,4'-diaminodiphenylmethane type bismaleimide.

[0089] Allyl compounds: diallyl bisphenol A.

[0090] Phenolic compounds: phenol.

[0091] Epoxy resin: Bisphenol A type diglycidyl ether.

[0092] Thermoplastic toughening particles: polydodecanoic acid particles with an average particle size of 10 μm.

[0093] Epoxy monomer: Bisphenol A type diglycidyl ether.

[0094] Monofunctional amine: aniline.

[0095] Viscosity reducer: Propylene glycol methyl ether propionate.

[0096] 2. Preparation of resin-based prepregs: The formulation of the resin film raw materials includes: 75.27 wt% bismaleimide monomer, 8.60 wt% allyl compound, 4.30 wt% phenolic compound, 10.75 wt% epoxy resin, and 1.08 wt% thermoplastic toughening particles.

[0097] It should be noted that in the following examples and comparative examples, the formulations of the resin film raw materials are the same except for the content of each of the above components and the types of epoxy resin and thermoplastic toughening particles.

[0098] Preparation of resin-based prepregs: ① According to the above formula, mix the allyl compound and phenolic compound evenly at 80°C, cool to 50°C, add thermoplastic toughening particles, and mechanically stir for 1 hour to fully disperse them until no visible agglomerates are visible. Add bismaleimide monomer and epoxy resin to the above mixture in sequence, heat to 100°C, and stir for 2 hours until all components are mixed evenly.

[0099] ② Place the above mixture on a coating machine and coat it onto release paper at 75°C to obtain a resin film layer with a film basis weight of 55 g / m².

[0100] ③ Using T800 grade carbon fiber, the basis weight of the carbon fiber layer is controlled at 216g / m². The above resin film layer and carbon fiber layer are composited by hot roller impregnation method, and the hot pressing temperature is 90℃ to obtain resin-based prepreg.

[0101] 3. Preparation of thermoplastic films: The formulation of the thermoplastic film raw material includes: 62.50 wt% epoxy monomer, 18.75 wt% monofunctional amine, and 18.75 wt% viscosity reducer.

[0102] It should be noted that in the following examples and comparative examples, the formulations of thermoplastic film raw materials are the same except for the different contents of the above-mentioned components.

[0103] Preparation of thermoplastic films: According to the above formula, epoxy monomer, monofunctional amine, and viscosity reducer were added sequentially to the flask. Nitrogen gas was introduced for protection, the reaction temperature was 150°C, and the mixture was mechanically stirred for 5 hours. After cooling to room temperature, the resulting mixture was poured into methanol and stirred vigorously. A solid precipitated, yielding the first reactant.

[0104] The first reactant was washed three times with methanol to remove unreacted monomers and low molecular weight byproducts, and then dried in a vacuum oven at 80°C for 48 hours.

[0105] The dried first reactant was placed in a hot press and hot-pressed at a temperature of 150°C and a pressure of 300 MPa. After cooling to room temperature, a thermoplastic film was obtained.

[0106] 4. Preparation of resin-based composite materials The resin-based prepreg layers are laid out in the layup sequence, and the thermoplastic film is placed between any adjacent resin-based prepreg layers. The film is cured using a vacuum bag-autoclave method, with a curing pressure of 0.6 MPa and a heating rate of 2 °C / min, to 150 °C. The film is then held at this temperature for 1 hour. The temperature is then further increased to 190 °C and held for 2 hours. Finally, the temperature is increased to 230 °C and held for 5 hours to obtain the resin-based composite material.

[0107] It should be noted that in the following embodiments and comparative examples, the layup sequence of the resin-based prepreg layer can be selected according to any type of layup sequence as needed for the product. In the following embodiments and comparative examples, the layup sequence of the resin-based prepreg layer is selected as [45 / 0 / -45 / 90]. 2s Lay out the layers sequentially.

[0108] Performance testing The properties of the resin-based composite material of Example 1 were tested using a universal testing machine. The interlaminar fracture toughness of Type I and Type II was tested according to ASTM D 5528 and ASTM D 7905, and the compressive strength after impact was tested according to ASTM D 7136 / 7137. The test results are recorded in Table 1.

[0109] To more clearly explain the technical solution of this application, this application also provides Examples 2-11 and Comparative Examples of resin-based composite materials, wherein the formulations and mechanical property test results of Examples 1-11 and Comparative Examples are shown in Table 1.

[0110] Table 1 shows specific embodiments and comparative examples of the resin-based composite materials in this application. It should be noted that, except for the parameters listed in Table 1, the other parameters of Examples 2-11 and the comparative examples are basically the same as those of Example 1.

[0111] In Table 1, the ratio C1 is the mass ratio of epoxy resin to thermoplastic toughening particles in the resin film layer. The ratio C2 is the mass ratio of epoxy monomer to viscosity reducer in the thermoplastic film; The ratio C3 is the ratio of the sum of the mass parts of epoxy monomers and monofunctional amines to the mass parts of viscosity reducer in the thermoplastic film.

[0112] Table 1: Formulation and Mechanical Property Test Results of Examples 1-11 and Comparative Examples

[0113] Table 1: Formulation and Mechanical Property Test Results of Examples 1-11 and Comparative Examples

[0114] As shown in Table 1, compared to the comparative example, the resin-based composite material prepared from the thermoplastic film of this application and the resin-based prepreg containing thermoplastic toughening particles exhibits excellent interlaminar fracture toughness and post-impact compressive strength. Combined with Examples 1-11, it can be seen that adjusting the mass ratio of each component in the resin film material and the thermoplastic film material of the resin-based prepreg can improve the interlaminar toughness and impact resistance of the resin-based composite material.

[0115] As can be seen from Table 1, compared with the comparative example, this application, by adjusting the mass ratio of components such as epoxy monomers, monofunctional amines, and viscosity reducers, facilitates the addition reaction of epoxy monomers and monofunctional amines, effectively introducing linear or low-crosslinking networks with flexible segments, reducing the crosslinking density of thermoplastic film materials, and thus effectively reducing the glass transition temperature of thermoplastic films, thereby improving the interlaminar fracture toughness and impact resistance of resin-based composite materials.

[0116] As can be seen from Table 1, compared with the comparative examples, in the resin-based composite materials of Examples 1-11 of this application, the thermoplastic film and the thermoplastic toughening particles can form an effective dual toughening system, which can synergistically improve the interlaminar toughness and impact resistance of the resin-based composite material, and enable the resin-based composite material to have better interlaminar fracture toughness and post-impact compressive strength.

[0117] As can be seen from Examples 1-11, when the thickness of the thermoplastic film is adjusted to 9~25μm, the resulting resin-based composite material exhibits a type I interlaminar fracture toughness ≥410J / m. 2 Interlaminar fracture toughness ≥1123 J / m 2The post-impact compressive strength is ≥242MPa. Compared with the untoughened resin-based composite material in the comparative example, the interlaminar fracture toughness and post-impact compressive strength are significantly improved, and the toughening effect is good.

[0118] In summary, thermoplastic films placed between any adjacent resin-based prepreg layers can exhibit a synergistic toughening effect with thermoplastic toughening particles. By adjusting the mass ratio of each component in the resin film material and thermoplastic film material, and controlling the thickness of the thermoplastic film to 9~25μm, the interlaminar toughness and impact resistance of resin-based composite materials can be effectively improved.

[0119] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0120] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A resin-based composite material, characterized in that, The resin-based composite material includes a thermoplastic film and a resin-based prepreg layer, wherein the thermoplastic film is disposed between any adjacent resin-based prepreg layers; The resin-based prepreg layer includes thermoplastic toughening particles.

2. The resin-based composite material according to claim 1, characterized in that, The resin-based prepreg layer includes a resin film layer and a carbon fiber layer; The resin film layer covers the carbon fiber layer and fills the gaps within the carbon fiber layer; The resin film layer includes the thermoplastic toughening particles; The mass ratio of the thermoplastic toughening particles to the resin in the resin film is 0.008 to 0.

029.

3. The resin-based composite material according to claim 2, characterized in that, The ratio of the average particle size of the thermoplastic toughening particles to the thickness of the thermoplastic film is 0.20 to 1.

67.

4. The resin-based composite material according to claim 2, characterized in that, The basis weight of the resin film layer is 50~61g / m³. 2 The basis weight of the carbon fiber layer is 199~235 g / m³. 2 The thickness of the thermoplastic film is 9~25μm.

5. The resin-based composite material according to claim 2, wherein the resin film layer comprises the following raw materials by weight percentage: Bismaleimide monomer 58.14wt%~82.57wt%; Allyl compounds: 6.35 wt% ~ 17.39 wt%; Phenolic compounds: 1.59 wt%~11.59 wt%; Epoxy resin 6.67wt%~18.67wt%; Thermoplastic toughening particles: 0.79wt%~2.90wt%; The mass ratio of the epoxy resin to the thermoplastic toughening particles is C1 = 3.37~14.

70.

6. The resin-based composite material according to any one of claims 1-5, wherein the thermoplastic film comprises the following raw materials by weight percentage: Epoxy monomers: 37.5 wt%~75.8 wt%; Monofunctional amines: 10.0 wt%~32.6 wt%; Viscosity reducer 10.0wt%~32.6wt%; The mass ratio of the epoxy monomer to the viscosity reducer is C2 = 1.07~8.00; The ratio of the sum of the mass fractions of the epoxy monomer and the monofunctional amine to the mass fraction of the viscosity reducer is C3 = 2.07~9.

00.

7. The resin-based composite material according to claim 6, characterized in that, The glass transition temperature of the thermoplastic film is 80~100℃.

8. A method for preparing a resin-based composite material, characterized in that, The preparation method is used to prepare the resin-based composite material according to any one of claims 1-7, and the preparation method includes: The resin-based prepreg layers are laid out in the following sequence; a thermoplastic film is placed between any two adjacent resin prepreg layers; and the resin-based composite material is cured under a first preset condition.

9. The method for preparing the resin-based composite material according to claim 8, characterized in that, The preparation method further includes: The thermoplastic film raw material is subjected to a second preset condition to obtain a first reactant, and the first reactant is hot-pressed under a third preset condition to obtain the thermoplastic film; and / or A resin film layer is coated on the surface of the carbon fiber layer, so that the resin film layer wets the carbon fiber layer; under the fourth preset condition, the resin-based prepreg layer is obtained by pressing.

10. The method for preparing the resin-based composite material according to claim 9, characterized in that, The first preset conditions include: heating at a curing pressure of 0.4~0.8MPa and a heating rate of 1.5~2.5℃ / min to 130~180℃; holding for curing for 0.5~1.5h; continuing to heat to 170~210℃ and holding for curing for 1.5~3.0h; further heating to 210~250℃ and holding for curing for 3.5~5.5h; and / or The second preset conditions include: a reaction temperature of 145~150℃, stirring for 4.5~5.5h, cooling and drying, washing with methanol, and then vacuum drying; and / or The third preset conditions include: hot pressing temperature of 140℃~160℃; hot pressing pressure of 250~350MPa; The fourth preset condition includes: the pressing temperature is 90~100℃.

Images