Lightweight composite carbon fiber high-speed rail seat framework and composite carbon fiber preparation process

Abstract

The application discloses a kind of light weight composite carbon fiber high-speed rail seat framework and composite carbon fiber preparation process, it is related to high-speed rail seat manufacturing technical field.In the present application, each raw material of preparation composite carbon fiber, by mass fraction, including: composite resin matrix 100-110 parts, reinforcing body 15-20 parts, composite filler 5-8 parts, lubricant 1-2 parts, antioxidant 1-2 parts, compatible agent 3-4 parts, flame retardant 5-8 parts;Composite resin matrix includes the mass ratio of 60-70:20-25:10-15 epoxy resin, polyether ether ketone and polycarbonate;The particle size of polycarbonate is 30-80nm;Reinforcing body is modified carbon fiber;Composite filler includes the mass ratio of 3-5:2-3 modified graphene nanosheet and modified alumina.The composite carbon fiber developed in the present application, compared with the performance of traditional single resin-based composite material is significantly improved, solve the technical contradiction of light weight and high strength, meet the stringent demand of high-speed rail seat framework on bearing safety, fireproof heat-resistant and energy saving weight reduction, promote high-speed rail equipment to high efficiency, energy saving direction development.

Description

Technical Field

[0001] This invention relates to the field of high-speed rail seat manufacturing technology, specifically to a lightweight composite carbon fiber high-speed rail seat frame and a composite carbon fiber preparation process. Background Technology

[0002] In the core technology system of high-speed rail equipment manufacturing, the seat frame, as a key load-bearing structure for safe and efficient train operation, requires crucial optimization and upgrading of its material properties. While traditional aluminum alloys (density approximately 2.7 g / cm³) and steel (density approximately 7.8 g / cm³) can meet basic strength requirements, their excessive weight leads to a significant increase in train energy consumption, contradicting the high-speed rail industry's development trend of "weight reduction and efficiency improvement." Industry data shows that a 10% reduction in the weight of high-speed rail components can reduce energy consumption by 6-8%, prompting the industry to urgently seek lighter alternative materials. Figure 2 The image shows a common high-speed rail seat frame structure.

[0003] Composite carbon fiber, with its lightweight and high-strength properties, has become an ideal candidate for high-speed rail seat frame materials. However, current traditional composite carbon fiber still faces technical bottlenecks in terms of structural strength, making it difficult to fully meet the stringent load-bearing and safety standards of high-speed rail seats. Overcoming the limitations of existing materials and developing composite carbon fiber materials that combine lightweight and high strength has become a pressing technical challenge in the high-speed rail equipment manufacturing field, and is of great significance for promoting the high-speed rail industry towards higher efficiency and energy conservation.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] To address the aforementioned technical problems, embodiments of the present invention provide a lightweight composite carbon fiber high-speed rail seat frame and a composite carbon fiber preparation process, thereby solving the problems mentioned in the background art.

[0006] I. The design principle of the lightweight composite carbon fiber high-speed rail seat frame and composite carbon fiber preparation process of the present invention is as follows:

[0007] 1. Composite resin matrix compatibility design

[0008] Epoxy resin: It has high strength, high adhesion and good processing performance, and as the main matrix, it provides basic mechanical properties and moldability for composite materials.

[0009] Polyetheretherketone (PEEK) is a high-performance thermoplastic engineering plastic with excellent heat resistance (long-term service temperature up to 260℃), wear resistance and impact resistance. Blending it with epoxy resin can significantly improve the overall performance of the composite material, especially its stability and wear resistance in high-temperature environments.

[0010] Polycarbonate (PC) fine powder: The particle size of polycarbonate is 30-80nm; its small particle size allows it to be uniformly dispersed in the composite resin matrix, playing a role similar to rigid particles in toughening, thereby improving the toughness and impact resistance of the material.

[0011] 2. Reinforcing material and filler design

[0012] Modified carbon fiber: T800 grade carbon fiber itself has extremely high strength and modulus. After growing carbon nanotubes on the surface, on the one hand, the specific surface area of ​​the carbon fiber is increased, which increases the contact area between the carbon fiber and the composite resin matrix. Through physical winding and chemical bonding, the interfacial bonding force is greatly enhanced. On the other hand, the excellent mechanical properties and conductivity of the carbon nanotubes can work together with the carbon fiber to further improve the performance of the composite material, effectively transfer load, and improve the overall strength and fatigue resistance of the material.

[0013] Modified graphene nanosheets: Graphene possesses excellent mechanical, electrical, and thermal properties. After modification with a silane coupling agent, its dispersibility in the composite resin matrix is ​​greatly improved, allowing it to uniformly distribute within the matrix to form a network structure. This network structure effectively inhibits crack propagation, improving the material's strength and wear resistance. Simultaneously, graphene's high thermal conductivity facilitates rapid heat dissipation, reducing temperature rise during use and enhancing material stability.

[0014] Modified nano-alumina: Nano-alumina has high hardness and high strength. After modification with stearic acid, it can be uniformly dispersed in the composite resin matrix, playing a role in reinforcement and wear resistance. Its fine particles can fill the voids in the composite resin matrix, improve the density of the material, and further enhance the mechanical properties and wear resistance of the material. In addition, the chemical stability of alumina helps to improve the chemical corrosion resistance of the material.

[0015] 3. Additive Design

[0016] Lubricant: The mixed lubricant of dimethyl silicone oil and microcrystalline wax can reduce the melt viscosity of the material during processing, improve fluidity, make the material easier to fill the mold, and improve molding efficiency; at the same time, it forms a lubricating film on the surface of the product, reduces the coefficient of friction, and reduces wear between parts.

[0017] Antioxidants: The combination of antioxidant 1010 and antioxidant 168 exhibits synergistic antioxidant effects. Antioxidant 1010 is a hindered phenolic antioxidant that can capture free radicals and interrupt the oxidation chain reaction; antioxidant 168 is a phosphite antioxidant that can decompose hydroperoxides. The combination of the two can effectively inhibit the oxidative degradation of materials during processing and use, extending the service life of the materials.

[0018] Compatibilizer: The maleic anhydride groups in maleic anhydride-grafted polystyrene (PS-g-MAH) can react chemically with the hydroxyl groups in epoxy resin and the ether bonds in polyether ether ketone, enhancing the compatibility between different resins and forming a uniform and stable phase structure in the composite resin matrix, thereby improving the mechanical properties and overall stability of the composite material.

[0019] Flame retardants: The compound flame retardant of ammonium polyphosphate (APP) and melamine cyanurate (MCA) improves the flame retardant performance of the material through synergistic effect. APP decomposes upon heating to produce phosphoric acid and polyphosphoric acid, forming a char layer that covers the material surface, isolating oxygen and heat; the gas produced by the decomposition of MCA dilutes the oxygen concentration and promotes the formation of the char layer. The combined effect of these two factors enables the composite material to meet the stringent fire resistance requirements of high-speed rail.

[0020] II. A lightweight high-speed rail seat frame composite carbon fiber, wherein the raw materials for preparing the composite carbon fiber, by mass parts, include:

[0021] The composite resin matrix consists of 100-110 parts, the reinforcing agent consists of 15-20 parts, the composite filler consists of 5-8 parts, the lubricant consists of 1-2 parts, the antioxidant consists of 1-2 parts, the compatibilizer consists of 3-4 parts, and the flame retardant consists of 5-8 parts.

[0022] The composite resin matrix comprises epoxy resin, polyetheretherketone and polycarbonate in a mass ratio of 60-70:20-25:10-15; the particle size of the polycarbonate is 30-80 nm.

[0023] The reinforcement is modified carbon fiber;

[0024] The composite filler consists of modified graphene nanosheets and modified alumina in a mass ratio of 3-5:2-3.

[0025] Preferably, the modified carbon fiber is made by modifying and growing carbon nanotubes on the surface of T800 grade carbon fiber; the length of T800 grade carbon fiber is 200-300mm and the diameter is 7-8μm.

[0026] Preferably, the modified graphene nanosheets are graphene oxide modified with silane coupling agent KH560, and their sheet diameter is 1-3μm; the modified alumina is alumina surface modified with stearic acid, and its average particle size is 8-12nm.

[0027] Preferably, the modification method for modified carbon fibers includes the following steps:

[0028] S41: T800 grade carbon fiber is immersed in a 5% (w / w) NaOH solution to remove surface impurities, then rinsed with deionized water until neutral, and dried at 120°C to obtain pretreated T800 grade carbon fiber.

[0029] S42: Using chemical vapor deposition, with acetylene as the carbon source and ferrocene as the catalyst precursor, the pretreated T800 grade carbon fiber is placed in a tube furnace. Under an argon protective atmosphere of 750-850℃, acetylene and ferrocene vapor are introduced and reacted for 2-3 hours to allow carbon nanotubes to grow in situ on the carbon fiber surface.

[0030] Preferably, the modification method for modified graphene nanosheets includes the following steps:

[0031] S51: Graphene oxide is dispersed in anhydrous ethanol to prepare a suspension with a mass fraction of 1%.

[0032] S52: Continue to add 10% of the mass of graphene oxide silane coupling agent KH560, and carry out the modification reaction by ultrasonic stirring at 60°C for 4 hours.

[0033] S53: After the modification reaction is completed, the precipitate is separated by centrifugation and then vacuum dried at 80°C for 12 hours to obtain modified graphene nanosheets.

[0034] Preferably, the modification method for modified alumina includes the following steps:

[0035] S61: Add nano-alumina to an ethanol solution of stearic acid with a mass fraction of 5%, and stir at 50°C for 3 hours to carry out the reaction;

[0036] S62: After the reaction is complete, the mixture is filtered, washed and dried to obtain nano-alumina modified with surface stearic acid.

[0037] Preferably, the lubricant comprises dimethyl silicone oil and microcrystalline wax in a mass ratio of 1:1;

[0038] The antioxidants include antioxidant 1010 and antioxidant 168 in a mass ratio of 2:1;

[0039] Compatibilizers include maleic anhydride-grafted polystyrene;

[0040] The flame retardant consists of ammonium polyphosphate and melamine cyanurate in a mass ratio of 3:2.

[0041] A method for manufacturing a lightweight high-speed rail seat frame using composite carbon fiber, as described above. Figure 1 As shown; including the following steps:

[0042] S81: Add epoxy resin, polyether ether ketone, polycarbonate, lubricant, antioxidant, compatibilizer, and flame retardant to a high-speed mixer in proportion, and mix at 80-100℃ for 15-20 minutes to ensure that all components are fully and evenly mixed to obtain the first mixture;

[0043] S82: Add modified carbon fiber, modified graphene nanosheets, and modified nano-alumina to the first mixture and continue mixing for 10-15 minutes to ensure that the fillers are evenly dispersed in the mixture, thus obtaining the second mixture;

[0044] S83: The second mixture is added to a twin-screw extruder and extruded at a temperature of 280-340℃ and a screw speed of 200-300 r / min to obtain modified carbon fiber composite granules;

[0045] S84: Using injection molding process, modified carbon fiber composite material granules are added to an injection molding machine to prepare molded parts of a specific shape.

[0046] It should be noted that the core idea behind the manufacturing method of lightweight high-speed rail seat frames using composite carbon fiber is:

[0047] (1) First, mix the resin matrix (epoxy resin, polyether ether ketone, polycarbonate) and additives (lubricant, antioxidant, etc.) thoroughly and evenly, and then add modified fillers (carbon fiber, graphene, alumina).

[0048] This "matrix first, filler later" addition sequence avoids direct contact between the filler and the metal parts of the high-speed mixer, reducing aspect ratio damage to the filler (especially rigid nanofillers) caused by excessive friction (such as carbon fiber breakage and graphene sheet damage), thereby maximizing the preservation of the filler's reinforcing and toughening effects.

[0049] (2) Mix at 80-100℃ for 15-20 minutes to ensure that the polymer resin matrix is ​​fully softened but not melted in the glassy or elastic state, and that the additives (such as compatibilizers) can be uniformly adsorbed on the resin surface to form a stable "resin-additive" pre-dispersion system.

[0050] (3) After adding the filler, mix for only 10-15 minutes to avoid interface damage caused by prolonged shearing. At this time, the resin matrix has not yet melted and exists in a solid or semi-solid form. The mechanical force of high-speed stirring "wedges" the filler into the gaps between resin particles to form a filler-resin physical encapsulation structure, which lays the foundation for uniform dispersion in subsequent extrusion molding.

[0051] An application of composite carbon fiber for lightweight high-speed rail seat frames as described above in high-speed rail seat frames.

[0052] Preferably, the composite carbon fiber is used to manufacture various structural components on the high-speed rail seat frame.

[0053] The present invention provides a lightweight composite carbon fiber high-speed rail seat frame and a composite carbon fiber preparation process, which has the following beneficial effects: Through the compatibility design of various materials, the composite carbon fiber prepared by the present invention achieves a breakthrough in both lightweight and high structural strength. Compared with traditional single resin-based composite materials, its performance is significantly improved. Moreover, through the synergistic effect of multiple components, the technical contradiction between lightweight and high strength is resolved, meeting the stringent requirements of high-speed rail seat frames for load-bearing safety, fire resistance, heat resistance, energy saving and weight reduction, and promoting the development of high-speed rail equipment towards high efficiency and energy saving. Attached Figure Description

[0054] Figure 1 This is a flowchart illustrating the manufacturing process of composite carbon fiber for lightweight high-speed rail seat frames in this invention.

[0055] Figure 2 This is a schematic diagram of a common high-speed rail seat frame structure. Detailed Implementation

[0056] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and 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.

[0057] To address the aforementioned technical problems, embodiments of the present invention provide a lightweight composite carbon fiber high-speed rail seat frame and a composite carbon fiber preparation process, thereby solving the problems mentioned in the background art.

[0058] I. Preparation of Different Composite Carbon Fibers

[0059] Example 1:

[0060] Weigh out the following proportions of each raw material according to their mass fractions in the composite carbon fiber:

[0061] 100 parts of composite resin matrix, 15 parts of modified carbon fiber, 5 parts of composite filler, 1 part of lubricant, 1 part of antioxidant, 3 parts of compatibilizer, and 5 parts of flame retardant.

[0062] The composite resin matrix comprises epoxy resin, polyetheretherketone, and polycarbonate in a mass ratio of 60:25:15; the polycarbonate has a particle size of 30-80 nm.

[0063] The composite filler consists of modified graphene nanosheets and modified alumina in a mass ratio of 3:2.

[0064] The following steps are followed to manufacture composite carbon fiber for lightweight high-speed rail seat frames:

[0065] Epoxy resin, polyether ether ketone, polycarbonate, lubricant, antioxidant, compatibilizer, and flame retardant are added to a high-speed mixer in proportion and mixed at 80-100℃ for 20 minutes to ensure that all components are fully and evenly mixed to obtain the first mixture.

[0066] Modified carbon fiber, modified graphene nanosheets, and modified nano-alumina are added to the first mixture and mixed for 10-15 minutes to ensure that the fillers are evenly dispersed in the mixture, thus obtaining the second mixture.

[0067] The second mixture is added to a twin-screw extruder and extruded at a temperature of 280-340℃ and a screw speed of 200-300 r / min to obtain modified carbon fiber composite granules.

[0068] The modified carbon fiber composite material granules are added to the injection molding machine to form a plate structure, which facilitates subsequent performance testing.

[0069] The modification method for modified carbon fiber includes the following steps:

[0070] T800 grade carbon fiber was soaked in a 5% (w / w) NaOH solution to remove surface impurities, then rinsed with deionized water until neutral, and dried at 120°C to obtain pretreated T800 grade carbon fiber.

[0071] Using chemical vapor deposition (CVD) with acetylene as the carbon source and ferrocene as the catalyst precursor, pretreated T800 grade carbon fibers were placed in a tube furnace and acetylene and ferrocene vapors were introduced under an argon protective atmosphere at 750-850℃ for 3 hours to allow carbon nanotubes to grow in situ on the carbon fiber surface.

[0072] The modification method for modified graphene nanosheets includes the following steps:

[0073] Graphene oxide was dispersed in anhydrous ethanol to prepare a suspension with a mass fraction of 1%.

[0074] Continue to add 10% of the silane coupling agent KH560 by mass of graphene oxide, and carry out the modification reaction by ultrasonic stirring at 60°C for 4 hours.

[0075] After the modification reaction was completed, the precipitate was separated by centrifugation and then vacuum dried at 80°C for 12 hours to obtain modified graphene nanosheets.

[0076] The modification method for modified alumina includes the following steps:

[0077] Nano-alumina was added to an ethanol solution of stearic acid with a mass fraction of 5%, and the mixture was stirred at 50°C for 3 hours to carry out the reaction.

[0078] After the reaction is complete, the mixture is filtered, washed, and dried to obtain nano-alumina with surface stearic acid modification.

[0079] Example 2:

[0080] Weigh out the following proportions of each raw material according to their mass fractions in the composite carbon fiber:

[0081] 100 parts of composite resin matrix, 20 parts of modified carbon fiber, 8 parts of composite filler, 2 parts of lubricant, 2 parts of antioxidant, 4 parts of compatibilizer, and 8 parts of flame retardant.

[0082] The composite resin matrix comprises epoxy resin, polyetheretherketone and polycarbonate in a mass ratio of 70:20:10; the particle size of the polycarbonate is 30-80 nm.

[0083] The composite filler consists of modified graphene nanosheets and modified alumina in a mass ratio of 5:3.

[0084] The manufacturing method of lightweight high-speed rail seat frame composite carbon fiber, as well as the modification method of modified carbon fiber, modified graphene nanosheet, and modified alumina, all adopt the method of Example 1.

[0085] Example 3:

[0086] Weigh out the following proportions of each raw material according to their mass fractions in the composite carbon fiber:

[0087] The composition includes 110 parts of composite resin matrix, 18 parts of modified carbon fiber, 7 parts of composite filler, 1.5 parts of lubricant, 1.5 parts of antioxidant, 3.5 parts of compatibilizer, and 6 parts of flame retardant.

[0088] The composite resin matrix comprises epoxy resin, polyetheretherketone, and polycarbonate in a mass ratio of 65:22:13; the polycarbonate has a particle size of 30-80 nm.

[0089] The composite filler consists of modified graphene nanosheets and modified alumina in a mass ratio of 4:4.

[0090] The manufacturing method of lightweight high-speed rail seat frame composite carbon fiber, as well as the modification method of modified carbon fiber, modified graphene nanosheet, and modified alumina, all adopt the method of Example 1.

[0091] Comparative Example 1:

[0092] The difference from Example 1 is that the composite resin consists of only 100 parts of epoxy resin; and the modified carbon fiber, modified graphene nanosheets, and modified alumina are all replaced with ordinary T800 grade carbon fiber, graphene, and alumina.

[0093] Comparative Example 2:

[0094] The difference from Example 1 is that the composite resin only includes epoxy resin and polyetheretherketone in a mass ratio of 75:25; and the modified carbon fiber, modified graphene nanosheets and modified alumina are all replaced with ordinary T800 grade carbon fiber, graphene and alumina.

[0095] Comparative Example 3:

[0096] The difference from Example 1 is that the modified carbon fiber is replaced with ordinary T800 grade carbon fiber.

[0097] Comparative Example 4:

[0098] The difference from Example 1 is that both the modified graphene nanosheets and the modified alumina are replaced with ordinary graphene and alumina.

[0099] II. Performance Testing of Different Composite Carbon Fibers

[0100] The performance test results of different composite carbon fibers are detailed in Table 1 below.

[0101] Table 1

[0102]

[0103] As shown in Table 1, the synergistic effect of the composite resin matrix (epoxy resin + polyether ether ketone + polycarbonate) with modified carbon fiber and modified filler in Examples 1-3 compared with Comparative Example 1 significantly improved tensile strength, flexural strength and impact strength, demonstrating the key role of multi-component resin system and modified carbon fiber and modified filler in strength.

[0104] Comparison of Comparative Example 1 with Comparative Example 2 (without polycarbonate fine powder): The addition of polycarbonate significantly improves tensile strength, flexural strength, etc., because its nano-sized particles (30-80nm) can be uniformly dispersed and enhance interfacial bonding.

[0105] Comparison of Examples 1-3 and Comparative Example 3 (Unmodified carbon fiber): Modified carbon fiber was used in Examples 1-3. The carbon nanotubes grown on the surface of the modified carbon fiber improved the tensile strength, and the bridging effect of the carbon nanotubes enhanced the load transfer efficiency between the fiber and the resin.

[0106] Comparison of Examples 1-3 and Comparative Example 3 (unmodified filler): Modified graphene and alumina significantly improved tensile strength, flexural strength and impact strength. The sheet structure of graphene and the nanoparticles of alumina synergistically inhibited crack propagation.

[0107] In summary, this invention significantly improves the structural strength of composite carbon fiber through multi-component resin composite, fiber / filler surface modification, and nanoscale dispersion technology. Its performance far exceeds that of traditional single resin-based composite materials, meeting the dual requirements of lightweight and high strength for high-speed rail seat frames.

[0108] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A lightweight high-speed rail seat frame made of composite carbon fiber, characterized in that, The raw materials for preparing composite carbon fiber, by mass parts, include: 100-110 parts of composite resin matrix, 15-20 parts of reinforcement, 5-8 parts of composite filler, 1-2 parts of lubricant, 1-2 parts of antioxidant, 3-4 parts of compatibilizer, and 5-8 parts of flame retardant. The composite resin matrix comprises epoxy resin, polyetheretherketone and polycarbonate in a mass ratio of 60-70:20-25:10-15; the particle size of the polycarbonate is 30-80 nm. The reinforcement is modified carbon fiber; The composite filler comprises modified graphene nanosheets and modified alumina in a mass ratio of 3-5:2-3; Modified carbon fiber is made by modifying and growing carbon nanotubes on the surface of T800 grade carbon fiber; the length of T800 grade carbon fiber is 200-300mm and the diameter is 7-8μm. The modified graphene nanosheets are graphene oxide modified with silane coupling agent KH560, and their sheet diameter is 1-3μm; the modified alumina is alumina surface modified with stearic acid, and its average particle size is 8-12nm.

2. The method for modifying the modified carbon fiber for the lightweight high-speed rail seat frame according to claim 1 includes the following steps: S41: T800 grade carbon fiber is immersed in a 5% (w / w) NaOH solution to remove surface impurities, then rinsed with deionized water until neutral, and dried at 120°C to obtain pretreated T800 grade carbon fiber. S42: Using chemical vapor deposition, with acetylene as the carbon source and ferrocene as the catalyst precursor, the pretreated T800 grade carbon fiber is placed in a tube furnace. Under an argon protective atmosphere of 750-850℃, acetylene and ferrocene vapor are introduced and reacted for 2-3 hours to allow carbon nanotubes to grow in situ on the carbon fiber surface.

3. The composite carbon fiber for lightweight high-speed rail seat frame according to claim 1, characterized in that, The method for modifying graphene nanosheets includes the following steps: S51: Graphene oxide is dispersed in anhydrous ethanol to prepare a suspension with a mass fraction of 1%. S52: Continue to add 10% of the mass of graphene oxide silane coupling agent KH560, and carry out the modification reaction by ultrasonic stirring at 60°C for 4 hours. S53: After the modification reaction is completed, the precipitate is separated by centrifugation and then vacuum dried at 80°C for 12 hours to obtain modified graphene nanosheets.

4. The composite carbon fiber for lightweight high-speed rail seat frame according to claim 1, characterized in that, The modification method for modified alumina includes the following steps: S61: Add nano-alumina to an ethanol solution of stearic acid with a mass fraction of 5%, and stir at 50°C for 3 hours to carry out the reaction; S62: After the reaction is complete, the mixture is filtered, washed and dried to obtain nano-alumina modified with surface stearic acid.

5. The composite carbon fiber for lightweight high-speed rail seat frame according to claim 1, characterized in that, The lubricant consists of dimethyl silicone oil and microcrystalline wax in a 1:1 mass ratio; The antioxidants include antioxidant 1010 and antioxidant 168 in a mass ratio of 2:1; Compatibilizers include maleic anhydride-grafted polystyrene; The flame retardant consists of ammonium polyphosphate and melamine cyanurate in a mass ratio of 3:

2.

6. A method for manufacturing a lightweight high-speed rail seat frame using composite carbon fiber as described in claim 1, characterized in that, Includes the following steps: S81: Add epoxy resin, polyether ether ketone, polycarbonate, lubricant, antioxidant, compatibilizer, and flame retardant to a high-speed mixer in proportion, and mix at 80-100℃ for 15-20 minutes to ensure that all components are fully and evenly mixed to obtain the first mixture; S82: Add modified carbon fiber, modified graphene nanosheets, and modified nano-alumina to the first mixture and continue mixing for 10-15 minutes to ensure that the fillers are evenly dispersed in the mixture, thus obtaining the second mixture; S83: The second mixture is added to a twin-screw extruder and extruded at a temperature of 280-340℃ and a screw speed of 200-300r / min to obtain modified carbon fiber composite granules; S84: Using injection molding process, modified carbon fiber composite material granules are added to an injection molding machine to prepare molded parts of a specific shape.

7. The application of composite carbon fiber for lightweight high-speed rail seat frame as described in claim 1 in high-speed rail seat frame.

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