Composite chute and preparation method thereof

Abstract

The invention provides a composite chute and a preparation method thereof. The preparation method comprises the following steps: step 1, preparing a to-be-compounded steel structure chute and a carbon fiber prepreg tape; step 2, performing texturing treatment on the surface to be compounded; 3, the steel structure chute is soaked in a weak acid solution and then washed with distilled water; step 4, spraying a silane coupling agent on the to-be-compounded surface; step 5, paving a carbon fiber prepreg tape on the to-be-compounded surface sprayed with the silane coupling agent; and 6, the carbon fiber-steel composite chute structure prefabricated body is placed in hot pressing equipment to be subjected to hot pressing forming. Through the steps of texturing and acid pickling activation, interface bonding force enhancement through a silane coupling agent, directional carbon fiber prepreg tape laying and high-temperature and high-pressure curing, synergistic reinforcement of a metal material and a high-performance fiber reinforced material is achieved, and the metal material has the advantages of light weight, high strength, wear resistance and excellent vibration and noise reduction performance.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgical equipment, and in particular to a composite chute and a preparation method thereof. Background Art

[0002] During the production process of a scrap shear, the impact and vibration of scrap entering the chute generate noise, which is then transmitted through the chute structure. Over long periods of operation, the chute's connecting components may loosen due to the constant vibration, further exacerbating the noise and affecting the equipment's stability. Furthermore, traditional chute materials have poor damping properties and are unable to effectively absorb vibration energy, causing the noise to propagate widely and impacting the working environment. Furthermore, equipment vibration can increase operating loads, affecting overall mechanical performance and service life.

[0003] Therefore, there is an urgent need to provide a composite chute to solve the problems in the prior art. Summary of the Invention

[0004] The main purpose of the present invention is to provide a composite chute and a preparation method thereof, so as to at least solve the problems in the prior art of the chute, such as large vibration and noise and easy loosening of components due to traditional connection methods and poor material damping performance.

[0005] In order to achieve the above object, the first aspect of the present invention provides a method for preparing a composite chute, comprising the following steps: Step 1: Prepare the steel structure chute and carbon fiber prepreg tape to be composited; Step 2: Roughening the surface of the steel structure chute to be composited; Step 3: Soak the steel structure chute in a weak acid solution for 1 to 6 hours, and then rinse with distilled water; Step 4: spraying silane coupling agent on the cleaned surface to be composited; Step 5: Laying the carbon fiber prepreg tape on the surface to be composited sprayed with the silane coupling agent to obtain a carbon fiber-steel composite chute structure preform; Step 6: Place the carbon fiber-steel composite chute structure preform in a hot pressing device for hot pressing to obtain a carbon fiber-steel composite chute.

[0006] Optionally, the carbon fiber prepreg tape is a prepreg with a thickness of 0.1 mm to 1 mm, which is made of continuous unidirectionally arranged carbon fiber tows impregnated with thermosetting resin.

[0007] Optionally, in the carbon fiber prepreg tape, the carbon fiber tow is T300~T1000 carbon fiber tow.

[0008] Optionally, in step 2, the roughness of the surface to be composited after the texturing treatment is Ra1.6 to Ra12.5.

[0009] Optionally, before step 3, the method further includes: Use dust-free paper to wipe the roughened surface to be composited, and then rinse with anhydrous ethanol or acetone.

[0010] Optionally, in step 4, spraying the coupling agent on the cleaned surface to be composited specifically includes: Evenly spray 0.1~5wt% silane coupling agent solution on the surface to be composited and let it stand for 1~15 minutes.

[0011] Optionally, in step 5, the carbon fiber prepreg tape is laid on the surface to be composited sprayed with the silane coupling agent to a thickness of 1 to 5 mm.

[0012] Optionally, in step 1, placing the carbon fiber-steel composite chute structure preform in a hot pressing device for hot pressing molding specifically includes: Step 601: placing a carbon fiber-steel composite chute structure preform in an inner cavity of a hot pressing device, and controlling the vacuum of the inner cavity; Step 602: Control the temperature of the inner cavity to rise uniformly from room temperature to 65-95°C and maintain it for 0.5-2 hours; Step 603: Continue to control the inner cavity to uniformly increase temperature and pressure, and maintain the temperature of the inner cavity at 100-200° C. and the pressure at 0.2-0.8 MPa for 1-4 hours; Step 604 , controlling the inner cavity to uniformly cool down and depressurize until the inner cavity pressure is normal pressure and the temperature reaches 20-40° C., then taking out the test piece to obtain a carbon fiber-steel composite chute.

[0013] Optionally, in step 602, the heating rate is 0.5~2°C / min; in step 603, the heating rate is 0.5~2°C / min, and the pressurization rate is 10~50 KPa / min; in step 604, the cooling rate is 0.5~2°C / min, and the pressure reduction rate is 10~50 KPa / min.

[0014] A second aspect of the present invention provides a composite chute, which is prepared using the composite chute preparation method of the present invention. The composite chute includes a steel structure chute and a carbon fiber prepreg tape composited on the inner surface of the steel structure chute.

[0015] The present invention provides a composite chute and a method for preparing the same, comprising the steps of: 1. preparing a steel structure chute and carbon fiber prepreg tape to be composited; 2. texturizing the surface of the steel structure chute to be composited; 3. soaking the steel structure chute in a weak acid solution for 1 to 6 hours, followed by rinsing with distilled water; 4. spraying a silane coupling agent on the cleaned surface to be composited; 5. applying the carbon fiber prepreg tape to the surface to be composited sprayed with the silane coupling agent to obtain a carbon fiber-steel composite chute structure preform; and 6. placing the carbon fiber-steel composite chute structure preform in a hot press to form the carbon fiber-steel composite chute. The synergistic reinforcement of the metal material and the high-performance fiber-reinforced material is achieved through the steps of texturizing and acid-washing activation, enhancing the interfacial bonding strength with a silane coupling agent, applying the oriented carbon fiber prepreg tape, and then curing at high temperature and high pressure. The high damping properties of carbon fiber effectively absorb vibration energy, significantly reducing noise generated by scrap impact and vibration transmission, while also suppressing the spread of vibration in connected components and preventing loosening. Furthermore, the high strength and rigidity of carbon fiber significantly enhance the chute's impact and wear resistance, reducing structural deformation and wear when scrap enters. Combined with the composite interface reinforced with silane coupling agents, the carbon fiber and steel matrix ensure synergistic load-bearing, avoiding fatigue failure under high stress in traditional metal chutes. The combination of lightweight, high-strength wear resistance, and excellent vibration and noise reduction significantly improves equipment operational stability and extends service life, while also improving the working environment and reducing the impact of noise pollution on worker health. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 This is a flow chart of a composite chute preparation method provided by the present invention; Figure 2 This is a schematic diagram of a carbon fiber-steel composite chute provided according to the present invention.

[0017] Description of reference numerals: 10. Steel structure chute; 20. Carbon fiber prepreg tape. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0019] like Figure 1 As shown, the present application provides a method for preparing a composite chute, comprising the following steps: Step 1: Prepare the steel structure chute 10 and the carbon fiber prepreg tape 20 to be composited; Step 2: roughening the surface of the steel structure chute 10 to be composited; Step 3: Soak the steel structure chute 10 in a weak acid solution for 1 to 6 hours, and then rinse with distilled water; Step 4: spraying silane coupling agent on the cleaned surface to be composited; Step 5: Laying the carbon fiber prepreg tape 20 on the surface to be composited sprayed with the silane coupling agent to obtain a carbon fiber-steel composite chute structure preform; Step 6: Place the carbon fiber-steel composite chute structure preform in a hot pressing device for hot pressing to obtain a carbon fiber-steel composite chute.

[0020] Specifically, step 1 begins by preparing a steel chute 10, which serves as the inlet chute for the edge shearing equipment, and carbon fiber prepreg tape 20. The steel chute 10 serves as the base for structural support and must be smooth and free of major defects. The carbon fiber prepreg tape 20 provides a high-strength reinforcement layer, enhancing the chute's impact and wear resistance. The choice of materials directly impacts the composite structure's ultimate mechanical properties and service life.

[0021] Step 2: Micro-roughen the surface of the steel structure chute 10 to be bonded, using methods such as sandblasting or sandpaper polishing. This increases surface roughness to enhance subsequent bonding strength. This roughening treatment creates a mechanical anchoring effect, strengthening the bond between the carbon fiber prepreg tape 20 and the steel structure and preventing delamination or peeling. The surface to be bonded is primarily the inner surface of the steel structure chute 10.

[0022] Step 3: Immerse the textured steel structure chute 10 in a weakly acidic solution to remove residual oxide layers, grease, or other contaminants, further activating the metal surface. This weakly acidic environment effectively cleans the steel without excessively corroding it. After immersion, rinse thoroughly with distilled water to ensure the surface is free of chemical residues and provide a clean base for subsequent coupling agent spraying. The weakly acidic solution can be phosphoric acid, oxalic acid, or citric acid.

[0023] Step 4: Spraying a silane coupling agent (such as KH-560) forms a chemical bonding bridge between the steel structure and the carbon fiber prepreg tape 20. The hydrophilic end of the coupling agent reacts with the steel surface, while the hydrophobic end bonds with the resin matrix of the carbon fiber prepreg tape 20, significantly improving interfacial adhesion. This can compensate for the shortcomings of simple mechanical anchoring, especially preventing debonding in long-term hot and humid environments, and improving the durability of the composite material.

[0024] Step 5: Cut the prepared carbon fiber prepreg tape 20 to the dimensions of the steel structure chute 10 to match the surface to be laminated and lay it out. Lay the carbon fiber prepreg tape 20 in the designed orientation (typically a 0° unidirectional or multi-directional multi-layer layup) across the surface to be laminated. Ensure there are no bubbles or wrinkles during laying. Use a roller to compact the tape if necessary to remove any air.

[0025] Step 6: Place the preformed body into an autoclave or hot press for curing and forming under high temperature and pressure. This hot pressing process completely crosslinks the epoxy resin in the carbon fiber prepreg tapes 20 (including between the epoxy resin layers in each carbon fiber prepreg tape 20, thus bonding the layers together), while simultaneously removing any remaining air bubbles and achieving a three-dimensional, tight bond between the resin, the fibers, and the steel structure. The result is a lightweight, high-strength, and wear-resistant carbon fiber / steel composite chute that meets the demands of industrial applications.

[0026] In the present application, carbon fiber is used in the process of preparing the composite chute. Carbon fiber has high strength and modulus, as well as good flexibility and damping properties. When the chute is made of carbon fiber-steel composite material, it can effectively absorb and dissipate the vibration energy, reduce the propagation of vibration, and thus reduce the generation of noise. Carbon fiber itself is a good sound insulation material, and its internal fiber structure and pores can scatter and block sound. When sound propagates in carbon fiber material, it will continuously reflect and refract between the fibers, consuming the energy of the sound, so that the intensity of the noise transmitted through the chute is weakened. Carbon fiber material is light and can enhance the structural strength and stability of the chute without adding too much weight. This helps to reduce the noise generated by equipment vibration, while also reducing the overall operating load of the equipment and extending the service life of the equipment. The use of carbon fiber / steel co-curing preparation process can avoid the need to punch holes in the carbon fiber, eliminating the hidden dangers of edge jamming caused by bolt connections in traditional bolt connection methods. The co-curing process achieves integrated molding of carbon fiber and steel through molecular-level fusion, forming a seamless connection structure. It not only eliminates the risk of waste wire jamming, but also enhances the sound absorption performance of the chute through the hysteresis damping generated by the internal pores in the carbon fiber composite material and the viscoelasticity of the resin. The stiffness and strength far exceed those of steel, enabling it to withstand greater impact loads and local stresses, enhancing the overall strength and durability of the chute, thereby ensuring the stable and efficient operation of the scrap shearing system.

[0027] The carbon fiber-steel composite chute preparation method disclosed in this application achieves synergistic reinforcement between the metal material and high-performance fiber-reinforced materials through steps such as texturing and pickling activation, silane coupling agent-enhanced interface bonding, oriented carbon fiber prepreg tape 20 placement, and high-temperature and high-pressure curing. This method balances interfacial bonding strength, structural mechanical properties, and long-term durability, ultimately resulting in a lightweight, high-strength, wear-resistant composite chute that significantly extends the service life of traditional steel chutes under impact and wear conditions. The high damping properties of carbon fiber effectively absorb vibration energy, significantly reducing the noise generated by scrap impact and vibration transmission, while also suppressing the propagation of vibration in connected components and preventing loosening. Furthermore, the high strength and rigidity of carbon fiber significantly enhance the chute's impact and wear resistance, reducing structural deformation and wear when scrap enters. Combined with the silane coupling agent-enhanced composite interface, the carbon fiber and steel matrix ensure synergistic load-bearing, avoiding fatigue failure under high stress in traditional metal chutes. The combination of lightweight, high-strength, wear-resistant, and excellent vibration and noise reduction properties improves equipment operational stability and extends service life, while also improving the working environment and reducing the impact of noise pollution on worker health.

[0028] In a possible embodiment, the carbon fiber prepreg tape 20 is a prepreg with a thickness of 0.1 mm to 1 mm, which is made of continuous unidirectionally arranged carbon fiber tows impregnated with a thermosetting resin.

[0029] Specifically, the carbon fiber prepreg tape 20 is a strip-shaped composite material made of continuous unidirectionally arranged high-performance carbon fiber tows fully impregnated with thermosetting epoxy resin. Its thickness is controlled between 0.1mm and 1mm, and it is prepared by a hot melt method or a solution method. The prepreg maintains the high strength characteristics of carbon fiber along a single direction (axial tensile strength can reach more than 4000MPa), while the resin matrix provides excellent bonding properties and environmental resistance. It is an intermediate material for achieving efficient composite of carbon fiber and steel structure. In the application of composite chute, its unidirectional arrangement can directionally enhance the structural bearing capacity, and the curing characteristics of the thermosetting resin ensure a strong bond with the steel structure interface, ultimately forming a lightweight, high-strength, wear-resistant and durable composite structure.

[0030] In a possible implementation, in the carbon fiber prepreg tape 20 , the carbon fiber tow is T300-T1000 carbon fiber tow.

[0031] Specifically, the carbon fiber tow is T300~T1000 carbon fiber tow, and T700 grade high-strength carbon fiber is preferred. T700 carbon fiber has excellent mechanical properties, with a tensile strength of up to 5000MPa and an elastic modulus of 240GPa. It can provide extremely high axial load-bearing capacity for composite materials and significantly improve the impact resistance and wear resistance of the chute. At the same time, its lightweight characteristics (density is only 1.8g / cm 3) can significantly reduce structural weight and lower energy consumption. Furthermore, the excellent fatigue performance and temperature resistance of T700 carbon fiber tow ensure the long-term reliability of the composite material under complex operating conditions. Overall, the composite chute using T700 carbon fiber tow achieves lightweight while maintaining high strength, and possesses excellent durability and environmental adaptability.

[0032] In a possible implementation, in step 2, the roughness of the surface to be composited after the texturing treatment is Ra1.6 to Ra12.5.

[0033] Specifically, controlling the roughness to Ra1.6 to Ra12.5 can significantly enhance the mechanical bond between the carbon fiber prepreg tape 20 and the steel structure through the microscopic concave-convex structure, forming a reliable interface bond and preventing delamination or peeling. It also avoids the problems of stress concentration or uneven resin distribution caused by excessive roughness (such as >12.5), while preventing insufficient bonding strength caused by excessive roughness (such as <1.6). The appropriate roughness ensures that the composite material maintains excellent impact and wear resistance during long-term use, and is particularly suitable for chute structures that withstand dynamic loads and complex working conditions, significantly extending component life and reducing maintenance costs. In a possible implementation manner, before step 3, the method further includes: Use dust-free paper to wipe the roughened surface to be composited, and then rinse with anhydrous ethanol or acetone.

[0034] Specifically, before step 3, add the step of wiping the surface to be composited after the roughening treatment with dust-free paper, and then rinsing it with anhydrous ethanol or acetone. Among them, wiping with dust-free paper can effectively remove solid pollutants such as metal debris and dust remaining on the surface after the roughening treatment, so as to prevent these impurities from affecting the adhesion and interface bonding quality of the subsequent coupling agent coating; and anhydrous ethanol or acetone, as a high-efficiency organic solvent, can deeply dissolve and remove organic pollutants such as grease and cutting fluid remaining on the surface, further purifying the composite interface. The synergistic effect of these two cleaning steps can significantly improve the cleanliness of the surface to be composited, create ideal conditions for the uniform adhesion of the silane coupling agent, and thus enhance the chemical bonding strength and interface bonding stability between the carbon fiber prepreg tape 20 and the steel structure.

[0035] In one possible embodiment, in step 4, spraying the coupling agent on the cleaned surface to be composited specifically includes: Evenly spray 0.1~5wt% silane coupling agent solution on the surface to be composited and let it stand for 1~15 minutes.

[0036] Specifically, in step 4, a 0.1-5wt% silane coupling agent solution is evenly sprayed onto the surface to be laminated and then allowed to stand for 1-15 minutes. A silane coupling agent concentration range of 0.1-5wt% ensures sufficient active groups to chemically bond with the steel surface (e.g., through hydroxyl condensation reactions), forming a stable Si-O bond network structure, while also preventing excessive surface accumulation of coupling agent due to excessive concentration, which could affect subsequent resin infiltration. The 1-15 minute stand time provides a sufficient reaction window, allowing the coupling agent molecules to fully penetrate and align at the interface while the solvent completely evaporates, ensuring a strong chemical bond between the coupling agent and the steel surface. This maximizes interfacial bonding strength, significantly improving the adhesion between the carbon fiber prepreg tape 20 and the steel structure while avoiding interface defects caused by excessive coupling agent or insufficient reaction time.

[0037] In a possible implementation, in step 5, the carbon fiber prepreg tape 20 is laid on the surface to be composited sprayed with the silane coupling agent to a thickness of 1 to 5 mm.

[0038] Specifically, in step 5, the laying thickness of the carbon fiber prepreg tape 20 is controlled within the range of 1 to 5 mm. This can achieve highly directional arrangement of the carbon fibers through multi-layer laying (such as 2-3 layers), give full play to their high axial strength characteristics (tensile strength can reach more than 4000 MPa), and significantly improve the impact resistance and wear resistance of the chute. It also avoids defects such as insufficient resin impregnation and residual bubbles caused by a single layer that is too thick (>5 mm), and prevents material waste and insufficient interface bonding strength caused by being too thin (<1 mm), ensuring that the composite material maintains excellent structural integrity and durability during long-term use.

[0039] In one possible embodiment, in step 1, the step of placing the carbon fiber-steel composite chute structure preform in a hot pressing device for hot pressing specifically includes: Step 601: placing a carbon fiber-steel composite chute structure preform in an inner cavity of a hot pressing device, and controlling the vacuum in the inner cavity of the hot pressing device; Step 602: Control the temperature of the inner cavity of the hot pressing equipment to rise uniformly from room temperature to 65-95° C. and maintain it for 0.5-2 hours; Step 603: Continue to control the temperature and pressure of the inner cavity of the hot pressing device to increase uniformly, and maintain the temperature of the inner cavity of the hot pressing device at 100-200° C. and the pressure at 0.2-0.8 MPa for 1-4 hours; Step 604 , controlling the temperature and pressure of the inner cavity of the hot pressing equipment to decrease uniformly until the pressure inside the equipment is normal pressure and the temperature reaches 20-40° C., then taking out the test piece to obtain a carbon fiber-steel composite chute.

[0040] Specifically, step 601 involves placing a carbon fiber-steel composite chute structure preform into a hot press and applying vacuum to thoroughly remove air and volatile substances (such as residual resin solvent) from within the preform and between layers. This prevents the formation of bubbles or voids during the curing process, thereby ensuring high density and interfacial bonding strength for the composite material. The vacuum environment also promotes uniform resin flow, improving impregnation and paving the way for subsequent heating and pressurization. The hot press is an autoclave.

[0041] Step 602: The temperature inside the autoclave is uniformly raised from room temperature to 65-95°C and maintained for 0.5-2 hours to soften the epoxy resin, allowing it to initially flow and soak into the carbon fibers, while also activating a portion of the curing reaction. This uniform temperature increase prevents rapid heating of the resin, which can cause internal stress or local overheating. It ensures uniform distribution and initial cross-linking of the resin, providing a good initial state for subsequent high-temperature curing.

[0042] Step 603: Continue heating and pressurizing to 100-200°C and 0.2-0.8 MPa. Maintain these conditions for 1-4 hours. The high temperature promotes complete crosslinking and curing of the epoxy resin, forming a high-strength three-dimensional network structure. The high pressure further eliminates residual bubbles and strengthens the bond between the resin and the fiber and steel structure. The synergistic effect of high temperature and high pressure in this stage ensures the material achieves optimal mechanical properties and durability.

[0043] Step 604: uniformly cool and decompress the autoclave to ambient pressure and 20-40°C, then remove the finished product. Gradually restore the ambient pressure and temperature to uniformly release the internal stress of the composite material, maintain structural integrity, and ultimately obtain a lightweight, high-strength, and dimensionally stable carbon fiber-steel composite chute.

[0044] In one possible implementation, in step 602, the heating rate is 0.5-2°C / min; in step 603, the heating rate is 0.5-2°C / min, and the pressurization rate is 10-50 KPa / min; in step 604, the cooling rate is 0.5-2°C / min, and the pressure reduction rate is 10-50 KPa / min.

[0045] Specifically, in steps 602 and 603, appropriate heating and pressurization rates are controlled. A heating rate of 0.5-2°C / min ensures that the epoxy resin is evenly heated and gradually completes the chemical reaction from softening to cross-linking, avoiding local overheating of the resin, internal stress concentration, or uneven curing due to rapid heating, and prevents heat transfer lag from causing excessive temperature differences between the inside and outside of the material. The synchronously controlled pressurization rate of 10-50 KPa / min matches the heating process, and gradually applies pressure in the temperature range where the resin has optimal fluidity. This can effectively eliminate interlayer bubbles and improve the infiltration effect, without destroying the fiber arrangement structure or causing delamination of the composite material due to a sudden increase in pressure. The dynamically balanced combination of process parameters achieves the synergistic optimization of the thermal, mechanical, and chemical factors during the hot pressing process, ensuring the maximization of the interface bonding strength between the carbon fiber and the steel structure.

[0046] In step 604, strict control of the cooling and depressurization rates ensures the structural integrity and performance stability of the composite material. A slow cooling rate (0.5-2°C / min) effectively avoids thermal stress concentration and prevents differential shrinkage between the carbon fibers and the epoxy resin matrix due to rapid cooling, which can lead to interfacial cracking or delamination. Simultaneously, the gradual cooling process fully releases residual stress within the material, maintaining the fiber orientation and dimensional stability of the overall structure. A matching depressurization rate (10-50 kPa / min) ensures that pressure release and temperature drop are synchronized, preventing internal pore rebound or structural distortion caused by a sudden pressure drop while maintaining a well-compacted composite near ambient temperature.

[0047] The present invention also provides a composite chute, which is prepared using the composite chute preparation method of the present invention. The composite chute includes a steel structure chute and a carbon fiber prepreg tape composited on the inner surface of the steel structure chute.

[0048] Specifically, the carbon fiber-steel composite chute provided by the present invention adopts a specific preparation method to compound the carbon fiber prepreg tape on the inner surface of the steel structure chute. The high strength and rigidity of carbon fiber give the chute excellent impact resistance, wear resistance and load-bearing capacity, which can effectively cope with the high-intensity impact and friction caused by the scrap edges in the production process of scrap shearing, greatly extend the service life of the chute, and reduce the cost of frequent replacement of the chute. The high damping characteristics of carbon fiber can significantly suppress vibration transmission, greatly reduce the noise generated by scrap edge impact and equipment operation, improve the working environment, and avoid vibration-induced loosening of chute connection components, ensuring stable operation of the equipment. In addition, the composite chute also has the characteristics of lightweight, which reduces the overall weight and operating load, further improves the mechanical properties and energy efficiency of the equipment, and achieves a qualitative leap in comprehensive performance compared to traditional steel chutes, and has broad application prospects.

[0049] The scheme of the present application is further illustrated by the following examples.

[0050] The carbon fiber-steel composite chute preparation method includes the following steps: 1. Prepare the inlet chute of the scrap shearing equipment and 0.1mm thick continuous unidirectional carbon fiber reinforced thermosetting prepreg to be compounded; 2. The surface of the steel structure chute 10 that contacts the carbon fiber to be composited is evenly rubbed with sandpaper to roughen it. The roughness of the composite surface after roughening is Ra6.3. 3. Wipe the surface of the steel structure chute 10 to be composited with dust-free paper, and then rinse with acetone reagent. 4. Prepare a weak acid solution and soak the steel structure chute 10 in the solution for 2 hours. After taking it out, rinse it with distilled water; 5. Prepare 0.5wt% silane coupling agent solution, spray it evenly on the surface to be composited of the steel structure chute 10, and let it stand for 10 minutes; 6. Cut the prepared carbon fiber prepreg to the size of each surface to be composited of the chute and lay it out with a total thickness of 4 mm to obtain a carbon fiber-steel composite chute structure preform; 7. Place the carbon fiber-steel composite chute structure preform in the autoclave equipment and evacuate to -0.095MPa. The vacuum pump is in operation throughout the entire curing process to ensure that the molding process is under vacuum conditions. The heating rate is increased at a uniform rate of 1°C / min. When the temperature rises from room temperature to 90°C, it is kept warm for 0.5h for pre-curing. At the end of the pre-curing stage, the temperature is increased and pressurized at a constant heating rate. The air compressor pressurization rate is maintained at 20KPa / min until the pressure in the tank reaches 0.5MPa. When the temperature rises to 130°C, it is kept warm and pressurized for 2h for post-curing. Subsequently, the cooling rate of 1°C / min and the pressure reduction rate of 20KPa / min are maintained until the pressure in the tank returns to normal pressure and the temperature reaches 40°C. Then, it is taken out to obtain a carbon fiber-steel composite chute. Figure 2 shown.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for preparing a composite chute, characterized in that: The steps include: Step 1: Prepare the steel structure chute and carbon fiber prepreg tape to be composited; Step 2: Roughening the surface of the steel structure chute to be composited; Step 3: Soak the steel structure chute in a weak acid solution for 1 to 6 hours, and then rinse with distilled water; Step 4: spraying silane coupling agent on the cleaned surface to be composited; Step 5: Laying the carbon fiber prepreg tape on the surface to be composited sprayed with the silane coupling agent to obtain a carbon fiber-steel composite chute structure preform; Step 6: Place the carbon fiber-steel composite chute structure preform in a hot pressing device for hot pressing to obtain a carbon fiber-steel composite chute.

2. The method for preparing a composite chute according to claim 1, wherein: The carbon fiber prepreg tape is a prepreg with a thickness of 0.1 mm to 1 mm, which is made of continuous unidirectionally arranged carbon fiber tows impregnated with thermosetting resin.

3. The method for preparing a composite chute according to claim 2, characterized in that: In the carbon fiber prepreg tape, the carbon fiber tow is T300-T1000 carbon fiber tow.

4. The method for preparing a composite chute according to claim 1, wherein: In the step 2, the roughness of the surface to be composited after the texturing treatment is Ra1.6 to Ra12.

5.

5. The method for preparing a composite chute according to claim 1, characterized in that: Before step 3, the method further includes: Use dust-free paper to wipe the roughened surface to be composited, and then rinse with anhydrous ethanol or acetone.

6. The method for preparing a composite chute according to claim 1, characterized in that: In step 4, spraying the coupling agent on the cleaned surface to be composited specifically includes: Evenly spray 0.1~5wt% silane coupling agent solution on the surface to be composited and let it stand for 1~15 minutes.

7. The method for preparing a composite chute according to claim 1, characterized in that: In the step 5, the carbon fiber prepreg is laid on the surface to be composited sprayed with the silane coupling agent to a thickness of 1 to 5 mm.

8. The method for preparing a composite chute according to claim 1, characterized in that: In step 1, placing the carbon fiber-steel composite chute structure preform in a hot pressing device for hot pressing and forming the preform specifically includes: Step 601: placing a carbon fiber-steel composite chute structure preform in an inner cavity of a hot pressing device, and controlling the vacuum of the inner cavity; Step 602: Control the temperature of the inner cavity to rise uniformly from room temperature to 65-95°C and maintain it for 0.5-2 hours; Step 603: Continue to control the inner cavity to uniformly increase temperature and pressure, and maintain the temperature of the inner cavity at 100-200° C. and the pressure at 0.2-0.8 MPa for 1-4 hours; Step 604 , controlling the inner cavity to uniformly cool down and depressurize until the inner cavity pressure is normal pressure and the temperature reaches 20-40° C., then taking out the test piece to obtain a carbon fiber-steel composite chute.

9. The method for preparing a composite chute according to claim 8, characterized in that: In step 602, the heating rate is 0.5-2°C / min; In step 603, the heating rate is 0.5-2°C / min, and the pressurization rate is 10-50 KPa / min; In step 604, the cooling rate is 0.5-2°C / min, and the pressure reduction rate is 10-50 KPa / min.

10. A composite chute, characterized in that: The composite chute is prepared by the preparation method of any one of claims 1 to 9, wherein the composite chute comprises a steel structure chute and a carbon fiber prepreg tape composited on the inner surface of the steel structure chute.

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