Carbon nanotube and carbon fiber composite material production process and product thereof

Abstract

The invention relates to a production process of a carbon nanotube and carbon fiber composite material. The production process comprises the following steps: (1) putting resin and a carbon nanotube into a magnetic stirrer according to a preset weight ratio, and stirring and mixing to obtain a mixture; (2) immersing the carbon fiber into the mixture, coating the carbon fiber with the mixture, and extruding the carbon fiber through an extruder to obtain a composite material; and (3) the extruded composite material is cut into a plurality of pieces or sections for use, the composite material is prepared by taking resin as a base material, mixing with carbon nanotubes and taking carbon fibers as traction, the carbon fibers serve as a main bearing structure, when the material is subjected to a stretching or bending load, most of force is borne by the carbon fibers, and the tensile strength of the material is improved. The resin, the carbon nanotubes and the carbon fibers are matched with one another, so that various properties of the composite material are remarkably improved, meanwhile, the composite material has good flowability of a plastic material, and the composite material can be applied to mold production, is high in practicability and can meet the manufacturing requirements of different industries.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber materials, specifically to a production process for carbon nanotubes, carbon fiber composite materials, and their products. Background Technology

[0002] Plastic materials are made from synthetic resins as a base, with the addition of fillers, plasticizers, stabilizers, and other additives. Due to their good flowability, they are widely used in molded products, but their mechanical, electrical, and thermal properties are relatively poor. Carbon fiber materials, on the other hand, are widely used due to their inherent mechanical, electrical, and thermal properties, but their poor flowability prevents them from being injection molded. If a new material combining the properties of both could be created, it would undoubtedly meet the diverse needs of different industries. Summary of the Invention

[0003] To address the problems and deficiencies of the prior art, this invention provides a production process for carbon nanotubes and carbon fiber composite materials, as well as their products. The specific technical solution is as follows: A process for producing carbon nanotube and carbon fiber composite materials, characterized by comprising the following steps: ① The resin and carbon nanotubes are mixed in a magnetic stirrer according to a preset weight ratio to obtain a mixture; ② The carbon fiber is immersed in the mixture, and after the mixture coats the carbon fiber, it is extruded through an extruder to produce a composite material; ③ Cut the extruded composite material into multiple pieces for easy use.

[0004] As a preferred embodiment of the present invention, in step ①, the magnetic stirrer is used to fully stir the resin, carbon nanotubes and carbon fibers at a set speed under constant temperature conditions, so that the resin, carbon nanotubes and carbon fibers are mixed evenly to form a well dispersed mixture without obvious agglomeration.

[0005] As a preferred embodiment of the present invention, in step ②, the continuous carbon fiber bundle is uniformly immersed into the mixture through the yarn guiding device so that its surface is fully coated with the composite slurry, and then immediately fed into a twin-screw extruder. In the extruder, the material is melted at high temperature, sheared and mixed, and extruded under high pressure to form a composite material profile with a dense structure, oriented fiber arrangement and good interfacial bonding.

[0006] As a preferred embodiment of the present invention, in step ③, the continuously extruded composite material is uniformly cooled and shaped under the action of the traction device, and then cut into sheet or segment products of predetermined length by an automatic cutting device according to application requirements, so as to facilitate subsequent transportation, storage and direct use in molding processes such as compression molding and winding.

[0007] As a preferred embodiment of the present invention, the weight ratio of resin, carbon nanotubes and carbon fibers is 1:0.05-0.1.

[0008] As a preferred embodiment of the present invention, the stirring speed of the magnetic stirrer is 800-1200 rpm, the stirring time is 1-2 hours, the working temperature of the extruder is 180-220℃, and the cutting length of the composite material is 10-20cm.

[0009] As a preferred embodiment of the present invention, the resin is epoxy resin, the carbon fiber has a diameter of 7-14 micrometers, and the carbon nanotube has a diameter of 10-20 nanometers.

[0010] A carbon nanotube and carbon fiber composite material product is obtained by the above-mentioned production process.

[0011] Beneficial effects: This invention provides a production process for carbon nanotube and carbon fiber composite materials to solve the defects of existing single plastic materials and carbon fiber materials. This composite material uses resin as a base material, mixes in carbon nanotubes, and uses carbon fiber as a traction material, thereby significantly enhancing the strength, electrical conductivity, and thermal conductivity of the composite material. At the same time, it has the good flowability of plastic materials, can be used in mold production, and has strong practicality to meet the manufacturing needs of different industries. Attached Figure Description

[0012] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0013] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings: In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0014] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0015] like Figure 1A process for producing carbon nanotube and carbon fiber composite materials is characterized by the following steps: ① Resin and carbon nanotubes are placed in a magnetic stirrer according to a preset weight ratio and stirred thoroughly at a set speed under constant temperature conditions to ensure uniform mixing and form a well-dispersed composite slurry without obvious agglomeration. This process requires strict control of stirring time and temperature to ensure effective dispersion of carbon nanotubes in the resin, thereby maximizing their reinforcing effect. ② Continuous carbon fiber bundles are uniformly immersed into the above mixture through a yarn guiding device to fully coat the surface of the composite slurry, and then immediately fed into a twin-screw extruder. In the extruder, the material undergoes high-temperature melting, shearing and mixing, and high-pressure extrusion to form a dense composite profile with oriented fiber arrangement and good interfacial bonding. During this stage, temperature, pressure, and extrusion speed must be precisely matched to avoid pore formation and ensure uniform distribution of the reinforcing phase. ③ The continuously extruded composite material is uniformly cooled and shaped under the action of a traction device, and then cut into sheet or segment products of predetermined lengths using an automatic cutting device according to application requirements, facilitating subsequent transportation, storage, and direct use in molding, winding, and other forming processes. This process effectively combines the high strength of carbon fiber with the nano-reinforcing effect of carbon nanotubes, significantly improving the mechanical and functional properties of composite materials. Example 1

[0016] Epoxy resin and carbon nanotubes were mixed in a magnetic stirrer at a weight ratio of 1:0.05 and stirred at 800 rpm for 1 hour to obtain a mixture. Carbon fibers were then impregnated into the mixture, and the mixture was used to coat the carbon fibers before extruding the composite material through an extruder set to a working temperature of 180°C. The extruded composite material was then cut into multiple pieces of 10 cm in length for easy use. Testing showed that the tensile strength of this composite material reached 1200 MPa, electrical conductivity increased by 20%, and thermal conductivity increased by 15%. Example 2

[0017] Epoxy resin and carbon nanotubes were mixed in a magnetic stirrer at a weight ratio of 1:0.1 and stirred at 1200 rpm for 2 hours to obtain a mixture. Carbon fibers were then impregnated into this mixture, and the mixture was used to coat the carbon fibers before extruding the composite material through an extruder operating at 220°C. The extruded composite material was then cut into multiple 20cm long pieces for use. Testing showed that the tensile strength of this composite material reached 1300MPa, electrical conductivity increased by 25%, and thermal conductivity increased by 20%. Example 3

[0018] Epoxy resin and carbon nanotubes were mixed in a magnetic stirrer at a weight ratio of 1:0.07 and stirred at 1000 rpm for 1.5 hours to obtain a mixture. Carbon fibers were then impregnated into this mixture, and the mixture was used to coat the carbon fibers before extruding the composite material through an extruder set to a working temperature of 200°C. The extruded composite material was then cut into multiple pieces of 15 cm in length for easy use. Testing showed that the tensile strength of this composite material reached 1250 MPa, electrical conductivity increased by 23%, and thermal conductivity increased by 18%. Example 4

[0019] Epoxy resin and carbon nanotubes (10 nm in diameter) were mixed in a magnetic stirrer at a weight ratio of 1:0.06 and stirred at 900 rpm for 1.2 hours to obtain a mixture. Carbon fibers were then impregnated into this mixture, and the mixture was used to coat the carbon fibers before extruding the composite material through an extruder operating at 190°C. The extruded composite material was then cut into multiple 12 cm long pieces for use. Testing showed that the composite material achieved a tensile strength of 1230 MPa, a 22% increase in electrical conductivity, and a 17% increase in thermal conductivity. Example 5

[0020] Epoxy resin and carbon nanotubes (20 nm in diameter) were mixed in a magnetic stirrer at a weight ratio of 1:0.08 for 1.8 hours at 1100 rpm to obtain a mixture. Carbon fibers were then impregnated into this mixture, and the mixture was used to coat the carbon fibers before extruding the composite material through an extruder operating at 210°C. The extruded composite material was then cut into multiple 18 cm long pieces for use. Testing showed that the composite material achieved a tensile strength of 1280 MPa, a 24% increase in electrical conductivity, and a 19% increase in thermal conductivity.

[0021] In summary, the composite material is made from resin, carbon nanotubes, and carbon fibers using the aforementioned process. The resin firmly bonds the carbon fibers and carbon nanotubes together, forming a unified structure that prevents fiber buckling or unraveling. The resin acts as a binder and fixator, and also encapsulates the carbon fibers and carbon nanotubes, isolating them from the external environment (such as moisture and chemicals) to prevent wear and corrosion. In the composite material, carbon fibers exist in the form of fiber bundles or fabrics and are the primary load-bearing structure. When the material is subjected to tensile or bending loads, the vast majority of the force is borne by the carbon fibers, providing the majority of the material's strength and stiffness, especially the dominant tensile strength. Carbon nanotubes are nanoscale materials; their inclusion is not to replace carbon fibers, but rather to compensate for the inherent defects of traditional carbon fiber composites. The surface of carbon fibers is smooth, and the interface with the plastic matrix is ​​the weak point of the composite material, prone to delamination. Carbon nanotubes can grow or be grafted onto the surface of carbon fibers, acting like "burrs" to firmly grip the matrix, greatly enhancing the interfacial bonding strength, thereby improving interlaminar shear strength and toughness. The synergistic effect of resin, carbon nanotubes, and carbon fibers significantly improves the various properties of the composite material.

[0022] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be considered that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the protection scope of the present invention.

Claims

1. A carbon nanotube, carbon fiber composite production process, characterized by, The method comprises the following steps: ① Put the resin and carbon nanotubes into a magnetic stirrer according to a preset weight ratio, mix and stir to obtain a mixture; ② Dip the carbon fibers into the mixture, coat the carbon fibers with the mixture, and then extrude the composite material from an extruder; ③ Cut the extruded composite material into multiple pieces or segments for use.

2. The carbon nanotube / carbon fiber composite material production process according to claim 1, wherein In step ①, the magnetic stirrer is stirred at a constant temperature and a set rotating speed to uniformly mix the resin and carbon nanotubes, so that a mixture with good dispersion and no obvious agglomeration is formed.

3. The carbon nanotube / carbon fiber composite material production process according to claim 1, wherein In step ②, the continuous carbon fiber bundle is uniformly dipped into the mixture through a yarn guide device, so that the surface of the carbon fiber bundle is fully coated with the composite slurry. Then, the carbon fiber bundle is immediately introduced into a double-screw extruder. In the extruder, the material is subjected to high-temperature melting, shearing mixing and high-pressure extrusion, so that a composite material profile with a compact structure, oriented fiber arrangement and good interface bonding is formed.

4. The carbon nanotube / carbon fiber composite material production process according to claim 1, wherein In step ③, the continuously extruded composite material is uniformly cooled and shaped under the action of a traction device. Then, according to the application requirements, the composite material is cut into a piece-shaped or segment-shaped product with a predetermined length by an automatic cutting device, so that the product can be conveniently transported, stored and directly used in molding, winding and other forming processes.

5. The carbon nanotube / carbon fiber composite material production process according to claim 1 or 2, wherein The weight ratio of the resin to the carbon nanotubes is 1:0.05-0.

1.

6. The carbon nanotube / carbon fiber composite material production process according to claim 1 or 2, wherein The stirring speed of the magnetic stirrer is 800-1200 rpm, the stirring time is 1-2 hours, the working temperature of the extruder is 180-220℃, and the cutting length of the composite material is 10-20 cm.

7. The carbon nanotube / carbon fiber composite material production process according to claim 1, wherein The resin is an epoxy resin, the diameter of the carbon fibers is 7-14 microns, and the diameter of the carbon nanotubes is 10-20 nanometers.

8. A carbon nanotube, carbon fiber composite article, characterized by, The composite material is prepared by the production process of any one of claims 1-8.

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