Large-size special-shaped carbon fiber composite material integrated preparation method

Abstract

The application relates to a large-size special-shaped structure carbon fiber composite material integrated preparation method and belongs to the technical field of textile composites. The large-size special-shaped structure carbon fiber composite material integrated preparation method comprises the following steps: mixing resin powder and a polydopamine solution to form a stable prepreg solution; uniformly attaching the prepreg solution to the surface of carbon fiber tows, collecting the pre-impregnated carbon fibers in an ordered manner after impregnation; taking the collected pre-impregnated carbon fibers as core yarns, selecting hot melt yarns as wrapping yarns, and tightly and uniformly wrapping the hot melt yarns on the carbon fibers through a knitting machine; placing the knitted composite yarns into an oven for uniform heating, so that the surface hot melt yarns are softened to form a soft film for wrapping the carbon fibers; processing the softened composite yarns by using a knitting technology to prepare a large-size special-shaped structure part; and curing and cooling the structure part to form a large-size special-shaped structure carbon fiber composite material. The application can quickly prepare a large-size special-shaped structure carbon fiber composite material.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of textile composites, and particularly relates to an integrated preparation method of large-size special-shaped carbon fiber composite materials. BACKGROUND

[0002] Carbon fiber reinforced polymer (CFRP) composites have excellent mechanical properties such as high specific strength, high specific stiffness, high damping and fatigue resistance, which makes them widely used in aerospace, sports equipment, automotive industry and other fields. As a sustainable alternative to carbon fiber reinforced thermoset (CFRTS) composites, carbon fiber reinforced thermoplastic (CFRTP) composites have excellent specific modulus and strength, excellent impact resistance and other advantages such as easy processing, recyclability and excellent corrosion resistance, making carbon fiber reinforced thermoplastic CFRTP one of the most advanced lightweight engineering materials and increasingly widely used in various fields.

[0003] The prior art discloses some carbon fiber composite materials and preparation methods thereof: Invention patent application CN115298265A discloses a thermoplastic carbon fiber composite material, a preparation method and an application thereof: a thermoplastic carbon fiber composite material, a preparation method and an application thereof, by compounding carbon fibers, glass fibers and a specific type of thermoplastic resin, the carbon fiber composite material has excellent toughness and bending performance; Invention patent application CN105504269A discloses a thermoplastic resin-based carbon fiber composite material and a preparation method thereof: a thermoplastic resin-based carbon fiber composite material and a preparation method thereof, by atomizing, mixing and spraying in an inert gas flow, polyoxamide prepolymer is coated on continuous carbon fibers, solid-phase polymerization is carried out, hot pressing is carried out, and a thermoplastic resin-based carbon fiber composite material is obtained; Invention patent application CN113370605A discloses a sandwich-structured carbon fiber composite material plate and a preparation process thereof: a sandwich-structured carbon fiber composite material plate has a sandwich structure, an intermediate layer composed of PMI foam and glass fiber prepreg layers is arranged between two carbon fiber prepreg layers, and aluminum foil-coated PET film and release film are simultaneously added, through the synergistic effect of the multi-layer structure, the carbon fiber composite material plate with excellent performance is obtained; Invention patent application CN109543335A discloses a design method of an external pressure-resistant carbon fiber composite material cylinder structure: the design method of the external pressure-resistant carbon fiber composite material cylinder structure is prepared by adopting a layering and winding mode, through design and calculation, the design cycle is effectively shortened, and the accuracy and efficiency of the design are improved; Invention patent application CN115556296A discloses a carbon fiber composite material shell, a preparation method thereof and an electronic device: a carbon fiber composite material shell is prepared by adopting a mold injection molding mode, the curing cycle is shortened, and the bonding strength is improved; Invention patent application CN118769444A discloses a microwave curing process for a carbon fiber composite material liquid forming preform: the microwave curing process for the carbon fiber composite material liquid forming preform is realized by introducing a metal film, a dielectric layer and a metal pattern on the carbon fiber composite material preform.

[0004] In summary, the existing carbon fiber composite material preparation process is complex, for the preparation of some large-size or special-shaped structural parts, a special mold needs to be designed according to the shape and size of the product, the cost is high, and the process is more complicated, and there is a lack of a way for rapid forming and low-cost production of complex structure composite materials. Therefore, in view of the defects in the prior art field, a large-size special-shaped structure carbon fiber composite material integrated rapid preparation method is proposed, which combines textile technology to meet the requirements of rapid forming of large-size special-shaped structure carbon fiber composite material parts. SUMMARY

[0005] The application provides a large-size special-shaped structure carbon fiber composite material integrated preparation method, aims to partially or completely solve the technical problems that the existing technology cannot quickly produce large-size, special-shaped structure carbon fiber composite material integrated preparation, and promotes the preparation method expansion and wider scene application of the carbon fiber composite material. In order to achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0006] A large-size special-shaped structure carbon fiber composite material integrated preparation method, comprising:

[0007] In step S100, the resin powder is mixed with a polydopamine PDA solution with a certain concentration, a stirring device is used, and the resin powder is uniformly dispersed in the solution by operating at a certain stirring speed and time to form a stable pre-impregnation solution;

[0008] In step S200, the carbon fiber and the pre-impregnation solution prepared in step S100 are fed to a sizing machine, the pre-impregnation solution is uniformly attached to the surface of the carbon fiber tows, and the pre-impregnated carbon fiber is collected in an orderly manner after impregnation;

[0009] In step S300, the pre-impregnated carbon fiber collected in step S200 is used as core yarn, hot melt yarn is selected as wrapping yarn, and the hot melt yarn is tightly and uniformly wrapped outside the carbon fiber by precisely controlling the winding speed, density and angle of the braiding machine;

[0010] In step S400, the braided composite yarn is placed in an oven for uniform heating, and the temperature and time are set according to the yarn characteristics and subsequent process requirements, so that the surface hot melt yarn softens to form a soft film wrapped around the carbon fiber;

[0011] In step S500, the softened composite yarn is processed using knitting technology to prepare a large-size, special-shaped structure;

[0012] In step S600, the structure prepared in step S500 is placed in a certain temperature T and time H for curing, so that the surface film and the inner layer powder are melted and fully combined with the carbon fiber;

[0013] In step S700, the cured structure is taken out of the oven and cooled at a certain temperature TC and time HC to slowly and uniformly cool, stabilize the internal structure and eliminate stress, and finally form a high-performance large-size special-shaped structure carbon fiber composite material.

[0014] Optionally, in step S100, the preparation method of the polydopamine PDA solution is as follows:

[0015] In step S101, the mass of dopamine hydrochloride required is calculated according to the required solution concentration and volume;

[0016] Step S102, a certain amount of Tris is accurately weighed by an electronic balance, dissolved in a proper amount of deionized water, and then hydrochloric acid is used to adjust the pH to 8.5 to prepare a Tris-HCl buffer solution;

[0017] Step S103, the calculated dopamine hydrochloride is accurately weighed by an electronic balance, added to a brown reagent bottle containing a proper amount of Tris-HCl buffer solution, and gently stirred to dissolve, to obtain a dissolved solution;

[0018] Step S104, the dissolved solution is transferred to a 100mL volumetric flask, the reagent bottle is rinsed with Tris-HCl buffer solution for 2-3 times, the rinsing solution is transferred to the volumetric flask, and then the Tris-HCl buffer solution is used to constant volume to the 100mL mark, and the concave liquid surface of the solution is tangent to the scale mark during constant volume;

[0019] Step S105, the constant volume solution is transferred back to the brown reagent bottle, sealed, and placed at room temperature for a period of time, so that the dopamine is subjected to self-polymerization reaction, the reaction time is 6-24 hours, and the solution color gradually deepens during the reaction, and finally a polydopamine solution is formed.

[0020] Optionally, the raw material of the resin powder is one or more of epoxy resin powder, phenolic resin powder, polyimide resin powder, polyamide resin powder and polypropylene resin powder.

[0021] Optionally, the hot melt wire is one or more of nylon hot melt wire, polyester hot melt wire and thermoplastic polyurethane (TPU) hot melt wire.

[0022] Optionally, in step S100, the concentration of the polydopamine (PDA) solution is 1mg / mL-5mg / mL.

[0023] Optionally, in step S400, the temperature and time for uniform heating are 70-80 DEG C and 5-10s, respectively.

[0024] Optionally, in step S600, the temperature T is in the range of 250-300 DEG C, and the time H is in the range of 30-60min.

[0025] Optionally, in step S700, the temperature TC is in the range of 20-30 DEG C, and the time HC is in the range of 10-30min.

[0026] The application has the following beneficial effects:

[0027] (1) In the present application, a simple pre-impregnation process is adopted, combined with weaving technology, to provide temperature control, to prepare soft and weavable carbon fiber composite yarn, to solve the problem of difficult weaving of carbon fiber, and to effectively reduce damage during weaving.

[0028] (2) In the present application, combined with knitting technology, through computer software process design, large-size, special-shaped structure carbon fiber composite fabric can be quickly prepared, rapid production is realized, manpower, raw material and time cost are saved, and waste of resources is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0030] Figure 1 The flowchart of steps S100 to S400 in the integrated preparation method of the large-size special-shaped structure carbon fiber composite material of the present application;

[0031] Figure 2 The flowchart of steps S500 to S700 in the integrated preparation method of the large-size special-shaped structure carbon fiber composite material of the present application;

[0032] Figure 3 The picture schematic diagram of the carbon fiber composite yarn of the present application on the knitting machine;

[0033] Figure 4 The planar structure knitted carbon fiber composite material of the present application;

[0034] Figure 5 The special-shaped structure knitted carbon fiber composite material of the present application;

[0035] Figure 6 The scanning electron microscope diagram of the carbon fiber combined with the melted TPU of the present application;

[0036] Figure 7 The scanning electron microscope diagram of the carbon fiber, polydopamine PDA and melted PA powder combination of the present application.

[0037] The drawings are used to provide further understanding of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application, and do not constitute a limitation of the present application. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0039] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. "Include" can be understood as at least including. In order to make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0040] Method for integrated production of large-size carbon fiber composite materials with complex structures

[0041] As shown in Figures 1 to 7 , a large-size special-shaped structure carbon fiber composite material integrated preparation method comprises:

[0042] Step S100, mixing resin powder with a certain concentration of polydopamine PDA (polydopamine, referred to as PDA) solution, using a stirring device, operating at a certain stirring speed and time, so that the resin powder is uniformly dispersed in the solution to form a stable pre-impregnation solution;

[0043] Step S200, feeding the carbon fiber and the pre-impregnation solution prepared in step S100 to a sizing machine, so that the pre-impregnation solution is uniformly attached to the surface of the carbon fiber tows, and the pre-impregnated carbon fiber is collected in order after impregnation; ensure that the collected pre-impregnated carbon fiber is arranged in order to facilitate subsequent weaving;

[0044] Step S300, using the pre-impregnated carbon fiber collected in step S200 as core yarn, selecting hot melt yarn as wrapping yarn, and precisely controlling the winding speed, density and angle through a knitting machine, so that the hot melt yarn is tightly and uniformly wrapped outside the carbon fiber;

[0045] Step S400, placing the knitted composite yarn into an oven for uniform heating, setting the temperature and time according to the yarn characteristics and subsequent process requirements, so that the surface hot melt yarn softens to form a soft film wrapping the carbon fiber;

[0046] Step S500, using knitting technology to process the softened composite yarn to prepare a large-size special-shaped structure part;

[0047] Step S600, the structure made in step S500 is put in, and curing is performed at a certain temperature T and time H, so that the surface film and the inner layer powder are melted and fully combined with the carbon fibers;

[0048] Step S700, the structure after curing is taken out from the oven, and cooling is performed at a certain temperature TC and time HC, so that it is slowly and uniformly cooled, the internal structure is stabilized, the stress is eliminated, and finally a high-performance large-size special-shaped structure carbon fiber composite material is formed.

[0049] Optionally, in step S100, the preparation method of the polydopamine PDA solution is as follows:

[0050] Step S101, according to the required solution concentration and volume, the mass of the required dopamine hydrochloride is calculated;

[0051] Step S102, a certain amount of Tris is accurately weighed by an electronic balance, dissolved in a proper amount of deionized water, and then the pH is adjusted to 8.5 by hydrochloric acid to prepare a Tris-HCl buffer solution;

[0052] Step S103, the calculated dopamine hydrochloride is accurately weighed by an electronic balance, added to a brown reagent bottle containing a proper amount of Tris-HCl buffer solution, and gently stirred to dissolve, so as to obtain a dissolved solution;

[0053] In some embodiments, in order to ensure the dissolution effect, a magnetic stirrer can be used for stirring, the stirring speed can be set to 200-400 revolutions per minute, and the stirring time is 15-30 minutes, until the dopamine hydrochloride is completely dissolved.

[0054] Step S104, the dissolved solution is transferred to a 100 mL volumetric flask, the reagent bottle is rinsed with Tris-HCl buffer solution for 2-3 times, the rinsing liquid is transferred to the volumetric flask, and then the Tris-HCl buffer solution is added to 100 mL scale line, and the concave liquid surface of the solution is tangent to the scale line during the constant volume;

[0055] Step S105, the constant volume solution is transferred back to the brown reagent bottle, sealed, and placed at room temperature for a period of time to allow the dopamine to undergo self-polymerization reaction, the reaction time is 6-24 hours, and the solution color will gradually deepen during the reaction, and finally a polydopamine solution is formed.

[0056] In the present application, firstly, a simple pre-impregnation process is adopted, combined with weaving technology, to provide temperature control, to prepare soft and weavable carbon fiber composite yarn, to solve the problem of difficult weaving of carbon fiber, and to effectively reduce damage during weaving; in addition, combined with knitting technology, process design can be carried out through computer software, to quickly prepare large-size and special-shaped carbon fiber composite fabric, to realize rapid production, to save manpower, raw materials and time cost, and to avoid waste of resources.

[0057] Optionally, the raw material of the resin powder is one or more of epoxy resin powder, phenolic resin powder, polyimide resin powder, polyamide resin PA powder, and polypropylene resin powder.

[0058] In the present application, the epoxy resin has high strength and good adhesion after curing, and is suitable for manufacturing products that need to withstand large external force and have stable structure; the phenolic resin has good heat resistance and can be used in high temperature environment; the polyimide resin has high mechanical properties and heat resistance, and is often used in aerospace high temperature parts; the polyamide resin PA has good wear resistance and is suitable for manufacturing mechanical transmission parts; the polypropylene resin has low cost and good chemical stability, and is often used in daily plastic products. The multi-choice of raw materials of the resin powder can fully exert the advantages of various raw materials, create new materials with composite properties, provide more possibilities for product innovation, reduce the over-reliance on specific raw materials, and realize the allocation and rational use of resources.

[0059] Optionally, the hot melt wire is one or more of nylon hot melt wire, polyester hot melt wire, and thermoplastic polyurethane TPU hot melt wire.

[0060] In the present application, the nylon hot melt wire has high strength and good wear resistance, can greatly improve the durability of the product, is suitable for scenes that are often rubbed and pulled, such as outdoor sports equipment and industrial conveyor belts, and can effectively prolong the service life of the product; the polyester hot melt wire is excellent in size stability, can keep the product in its original shape in high temperature or humid environment, can avoid deformation, and can ensure stable quality; the thermoplastic polyurethane TPU hot melt wire has excellent elasticity and low temperature resistance, and can give the product good flexibility and low temperature adaptability. The selection of multiple hot melt wires can meet the diversified needs of different industries and different products, and can flexibly adjust the performance of the product by using them separately or mixedly, to win greater technical advantage for the product in the market.

[0061] Optionally, in step S100, the concentration of the polydopamine PDA solution is 1-5 mg / mL.

[0062] In the application, the polydopamine PDA solution has a concentration of 1 mg / mL-5 mg / mL, and the polydopamine solution can exhibit good adhesion performance, can be effectively attached to the surface of the carbon fiber material, enhance the bonding force with the carbon fiber material, and improve the overall performance of the carbon fiber composite material; at the same time, the self-polymerization of polydopamine can be moderately carried out, which will not cause the reaction to be too violent due to too high concentration, and will not affect the uniformity of the material due to the agglomeration of the material, and will not cause the reaction to be too slow due to too low concentration, and will not form a polydopamine coating with sufficient thickness and quality, thereby affecting the function of the material.

[0063] Optionally, in step S400, the temperature and time of uniform heating are 70-80 DEG C and 5-10 s, respectively.

[0064] In the application, firstly, under the temperature condition of 70-80 DEG C, the hot melt wire is softened and wrapped, and the thermal influence on the carbon fiber is reduced, which effectively avoids the decrease of the strength, toughness and other key performance indicators of the carbon fiber due to overheating, and retains the original high performance advantage of the carbon fiber; in addition, the rapid heating process of 5-10 s greatly shortens the single production cycle, significantly improves the production efficiency, reduces the production cost, and helps the smooth progress of large-scale industrial production; in addition, the soft film formed by the uniformly softened hot melt wire tightly wraps the carbon fiber, which not only enhances the flexibility of the composite yarn, but also enhances the bonding force between the carbon fibers, so that the composite yarn can more evenly disperse stress when bearing external force, and the overall mechanical properties of the composite yarn are improved.

[0065] Optionally, in step S600, the temperature T ranges from 250 DEG C to 300 DEG C, and the time H ranges from 30 min to 60 min.

[0066] In the application, the temperature T ranges from 250 DEG C to 300 DEG C, and the higher temperature can initiate and accelerate specific chemical reactions, such as material curing, crosslinking and other processes, promote the material to form a more stable and solid structure, and thus improve the mechanical properties, heat resistance and other parameters of the material; the time H ranges from 30 min to 60 min, which ensures that the curing reaction is carried out sufficiently, so that the surface film and the inner layer powder are melted and combined with the carbon fiber. The combination of temperature and time can provide precise time and temperature control for the performance improvement of the structural product, so that the performance of the structural product can be further optimized, and the performance requirements of different industrial productions on the structural product can be met.

[0067] Optionally, in step S700, the temperature TC ranges from 20 DEG C to 30 DEG C, and the time HC ranges from 10 min to 30 min.

[0068] In the present application, the temperature TC is controlled in the range of 20-30°C, which is close to room temperature, relatively mild and easy to achieve, and will not destroy its active ingredients due to high temperature. At a temperature of 20-30°C, combined with a time HC of 10-30 min, the cured structure can undergo slow and stable physical or chemical changes, such as stabilizing the internal structure, stress release, etc., to ultimately form a high-performance large-size special-shaped structure carbon fiber composite material. The range of time HC can ensure that these processes are fully completed, while avoiding low production efficiency due to excessive time, and also helps to maintain the original characteristics of the material, achieving the set goal of preparing a large-size special-shaped structure carbon fiber composite material, and improving the quality and stability of the large-size special-shaped structure carbon fiber composite material product.

[0069] Exemplary description of a method for integrated production of large-size carbon fiber composite materials with complex structures

[0070] Step S1, mix the PA resin powder with a 2 mg / ml polydopamine PDA solution, use a stirring device, operate at a certain stirring speed and time, so that the resin powder is uniformly dispersed in the solution to form a stable pre-impregnation solution;

[0071] Step S2, send the carbon fiber and the pre-impregnation solution prepared in step S1 to the sizing machine, so that the pre-impregnation solution is uniformly attached to the surface of the carbon fiber tows, and then collect the pre-impregnated carbon fiber in order after impregnation to ensure its neat arrangement and facilitate subsequent weaving;

[0072] Step S3, use the pre-impregnated carbon fiber collected in step S2 as core yarn, select TPU hot melt yarn as wrapping yarn, and control the winding speed, density and angle accurately through the knitting machine to make the hot melt yarn tightly and uniformly wrap the carbon fiber;

[0073] Step S4, place the knitted composite yarn into an oven for uniform heating, and the uniform heating temperature and time are 80°C and 5s, respectively. The temperature and time are set according to the characteristics of the yarn and the requirements of the subsequent process, so that the surface hot melt yarn softens to form a soft film wrapping the carbon fiber;

[0074] Step S5, process the softened composite yarn using knitting technology to prepare a large-size special-shaped structure;

[0075] Step S6, place the structure prepared in step S500 into an oven and cure at 260°C for 30 min to make the surface film and the inner layer powder melt and fully combine with the carbon fiber;

[0076] Step S7, take out the cured structure from the oven and cool it at 20°C for 10 min to make it cool slowly and uniformly, stabilize the internal structure, eliminate stress, and ultimately form a high-performance large-size special-shaped structure carbon fiber composite material.

[0077] Wherein, in step S1, the preparation method of the polydopamine PDA solution is as follows:

[0078] Step S11, according to the required solution concentration and volume, the mass of dopamine hydrochloride required is calculated, and a 100 mL 2 mg / mL polydopamine PDA solution is prepared, and the mass of dopamine hydrochloride is 200 mg;

[0079] Step S12, a certain amount of Tris is accurately weighed by an electronic balance, dissolved in a proper amount of deionized water, and then adjusted to pH 8.5 with hydrochloric acid to prepare a Tris-HCl buffer solution;

[0080] Step S13, accurately weigh the calculated 200 mg of dopamine hydrochloride by an electronic balance, add it to a brown reagent bottle containing a proper amount of Tris-HCl buffer solution, and gently stir to dissolve it to obtain a dissolved solution;

[0081] In some embodiments, in order to ensure the dissolution effect, a magnetic stirrer can be used for stirring, the stirring speed can be set at 200-400 revolutions per minute, and the stirring time is 15-30 minutes until the dopamine hydrochloride is completely dissolved.

[0082] Step S14, transfer the dissolved solution to a 100 mL volumetric flask, rinse the reagent bottle with Tris-HCl buffer solution for 2-3 times, transfer the rinsing liquid to the volumetric flask, and then use Tris-HCl buffer solution to make up to 100 mL scale line, pay attention to the tangency of the concave liquid surface of the solution and the scale line when making up;

[0083] Step S15, transfer the solution after making up to the brown reagent bottle, seal it well, and place it at room temperature for a period of time to allow dopamine to undergo self-polymerization reaction, the reaction time is 6-24 hours, and the solution color will gradually deepen during the reaction, and finally form a polydopamine solution.

[0084] The embodiment shown in the drawing is only one of the embodiments of the present application, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired thereby, without departing from the creative purpose of the present application, similar structure and embodiments can be designed without creativity, which should belong to the protection scope of the present application.

Claims

1. A method for integrated preparation of large-scale special-shaped carbon fiber composite materials, characterized in that: include: Step S100, mixing resin powder with a polydopamine (PDA) solution of a certain concentration, using a stirring device at a certain stirring speed and time to uniformly disperse the resin powder in the solution to form a stable prepreg; Step S200, sending the carbon fiber and the prepreg prepared in step S100 to a sizing machine, allowing the prepreg to evenly adhere to the surface of the carbon fiber tow, and collecting the prepreg carbon fibers in an orderly manner after impregnation is completed; Step S300: Using the pre-impregnated carbon fiber collected in step S200 as the core yarn and the thermo-fusible yarn as the wrapping yarn, the braiding machine precisely controls the winding speed, density, and angle so that the thermo-fusible yarn is tightly and evenly wrapped around the carbon fiber. Step S400: placing the braided composite yarn into an oven for uniform heating. The temperature and time are set according to the yarn characteristics and subsequent process requirements to soften the surface thermal melt to form a soft film that wraps the carbon fibers. Step S500, using knitting technology to process the softened composite yarn to prepare large-sized, special-shaped structural parts; Step S600: Place the structural component manufactured in step S500 and perform curing at a certain temperature T and time H, so that the surface film and inner layer powder are melted and fully combined with the carbon fiber; In step S700, the cured structural component is taken out of the oven and cooled at a certain temperature TC and time HC to allow it to cool slowly and evenly, stabilize the internal structure, eliminate stress, and ultimately form a high-performance large-size special-shaped carbon fiber composite material.

2. The method for integrated preparation of large-sized special-shaped carbon fiber composite materials according to claim 1, characterized in that: In step S100, the preparation method of polydopamine PDA solution is as follows: Step S101, calculating the required mass of dopamine hydrochloride according to the required solution concentration and volume; Step S102: accurately weigh a certain amount of tris (hydroxymethyl)aminomethane (Tris) using an electronic balance, dissolve it in an appropriate amount of deionized water, and then adjust the pH to 8.5 with hydrochloric acid to prepare a Tris-HCl buffer solution; Step S103: accurately weigh the calculated dopamine hydrochloride using an electronic balance, add it to a brown reagent bottle containing an appropriate amount of Tris-HCl buffer solution, and gently stir to dissolve it to obtain a dissolved solution; Step S104: Transfer the dissolved solution to a 100 mL volumetric flask, rinse the reagent bottle 2-3 times with Tris-HCl buffer solution, transfer the rinse solution to the volumetric flask, and then dilute to the 100 mL mark with Tris-HCl buffer solution. When diluting, ensure that the concave liquid surface of the solution is tangent to the scale line. Step S105, transfer the fixed volume solution back to the brown reagent bottle, seal it, and place it at room temperature for a period of time to allow dopamine to undergo self-polymerization reaction. The reaction time is 6-24 hours. During the reaction, the color of the solution will gradually darken, and finally a polydopamine solution will be formed.

3. The method for integrated preparation of large-sized special-shaped carbon fiber composite materials according to claim 1, characterized in that: The raw material of the resin powder is one or more of epoxy resin powder, phenolic resin powder, polyimide resin powder, polyamide resin powder and polypropylene resin powder.

4. The method for integrated preparation of large-sized special-shaped carbon fiber composite materials according to claim 1, characterized in that: The hot melt thread is one or more of nylon hot melt thread, polyester hot melt thread and thermoplastic polyurethane TPU hot melt thread.

5. The method for integrated preparation of large-sized special-shaped carbon fiber composite materials according to claim 1, characterized in that: In step S100 , the concentration of the polydopamine (PDA) solution is 1 mg / mL-5 mg / mL.

6. The method for integrated preparation of large-sized special-shaped carbon fiber composite materials according to claim 1, characterized in that: In step S400, the temperature and time for uniform heating are 70°C-80°C and 5s-10s respectively.

7. The method for integrated preparation of large-sized special-shaped carbon fiber composite materials according to claim 1, characterized in that: In step S600 , the temperature T ranges from 250° C. to 300° C., and the time H ranges from 30 min to 60 min.

8. The method for integrated preparation of large-sized special-shaped carbon fiber composite materials according to claim 1, characterized in that: In step S700 , the temperature TC ranges from 20° C. to 30° C., and the time HC ranges from 10 min to 30 min.

Images