Preparation method of CNTs and MXene synergistically modified CF reinforced PDMS-based composite material
By growing carbon nanotubes in situ on carbon fiber cloth and modifying PDMS matrix with MXene, the problems of high density, easy corrosion and weak interface combination of traditional materials are solved, and high-performance electromagnetic shielding and mechanical performance improvements are achieved, suitable for aerospace, military and other fields.
Patent Information
- Application Number
- CN202510844951.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-23
- Publication Date
- 2025-08-15
AI Technical Summary
Traditional metal-based electromagnetic shielding materials have high density, are easy to corrode, are costly and have poor flexibility. Carbon fiber reinforced polymer-based composite materials have problems such as weak interface bonding and low thermal conductivity, which is difficult to meet the high shielding needs.
Under the protection of argon, the carbon fiber cloth was heated at high temperature, and the carbon nanotubes were grown in situ, and the PDMS matrix was modified in cooperation with MXene to form a multi-scale reinforcement. Through vacuum defoaming and thermal curing molding, CNTs and MXene collaboratively modified CF enhanced PDMS matrix composites were prepared.
It significantly improves the mechanical properties and electromagnetic shielding performance of composite materials, enhances interface combination, optimizes conductivity and structural stability, and meets the needs of high-performance electromagnetic protection.
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Figure CN120484290A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of material technology, and in particular to CNTs and MXene synergistically modified CF reinforced PDMS-based composite materials. Background Art
[0002] With the widespread adoption of electronic devices and the increasingly complex electromagnetic environment, traditional metal-based electromagnetic shielding materials, while offering excellent electromagnetic wave shielding performance, are significantly limited in their application due to defects such as high density, susceptibility to corrosion, high cost, and poor flexibility. The development of high-performance electromagnetic wave shielding materials is urgent. Carbon fiber-reinforced polymer-based composites have become a highly sought-after alternative material due to their advantages such as light weight, corrosion resistance, low cost, and good processability. Their polymer matrix also features low density, strong corrosion resistance, and good designability. However, these composites suffer from the low thermal conductivity of the polymer matrix and weak interfacial bonding due to the smooth surface of the carbon fibers, making them difficult to meet high shielding requirements. Summary of the Invention
[0003] The embodiments of the present application provide a method for preparing a PDMS-based composite material reinforced with CF modified by synergistic means of CNTs and MXene to solve the technical problems raised in the above-mentioned background technology.
[0004] The present invention provides a CNTs and MXene synergistically modified CF reinforced PDMS-based composite material, comprising: S1: Under an argon protective atmosphere, the carbon fiber cloth is placed in a heat treatment furnace and heated to 700-900°C and then kept warm to obtain a pretreated carbon fiber substrate; S2: injecting a mixed solution of anhydrous ethanol, ethylenediamine and ferrocene into a heat treatment furnace, and in situ growing carbon nanotubes on the surface of the pretreated carbon fiber substrate under heat preservation conditions. After the reaction is completed, the temperature is lowered to room temperature to form a multi-scale reinforcement; S3: Add the MXene deionized water solution to the PDMS polymer and stir evenly, then dry at 80-150°C for 4-6 hours to remove the deionized water to form a PDMS-MXene matrix; S4: adding a curing agent to the PDMS-MXene matrix and mixing uniformly to obtain a MXene-modified PDMS polymer; S5: The multi-scale reinforcement is immersed in the MXene-modified PDMS polymer, and after vacuum degassing and thermal curing, a CNTs and MXene synergistically modified CF reinforced PDMS-based composite material is obtained.
[0005] In a possible implementation, in S2, the mixed solution is injected into the heat treatment furnace and reacted for 20-60 minutes under insulation conditions.
[0006] In a possible implementation, in S3, the amount of MXene added is 0.05-0.2 wt.% of the mass of the PDMS polymer.
[0007] In a possible implementation, the mass ratio of the curing agent to the PDMS polymer is 1:(5-20).
[0008] In a possible implementation, the mass of the PDMS polymer is 5-20 g, and the mass of the curing agent is 0.5-2 g.
[0009] In a possible implementation, in S5, the vacuum degassing is performed at room temperature for 5-40 minutes; the heat curing temperature is 80-200° C., and the curing time is 5-30 minutes.
[0010] In one possible implementation, the MXene is .
[0011] In a possible implementation, the curing agent is a silicon-based cross-linking agent.
[0012] In one possible implementation, in S3, MXene powder is added to deionized water and uniformly dispersed by ultrasound to obtain a MXene deionized water solution.
[0013] One or more technical solutions provided in the embodiments of this application have at least the following technical effects: The preparation method of PDMS-based composite materials reinforced by synergistic modification of CNTs and MXene by MXene is provided in the embodiments of the present application. The carbon fiber cloth is subjected to high-temperature heat treatment under argon protection to prevent the carbon fiber from being oxidized, creating good conditions for subsequent reactions. On this basis, the in-situ grown carbon nanotubes and carbon fibers constitute a multi-scale reinforcement. This multi-scale structure not only improves the mechanical strength and toughness of the composite material, but more importantly, the high aspect ratio characteristics of the carbon nanotubes enhance the scattering and absorption capabilities of electromagnetic waves, effectively making up for the insufficient shielding performance caused by the smooth surface of the carbon fiber, greatly improving the electromagnetic shielding effectiveness of the composite material, making it more competitive in the field of electromagnetic protection. The addition of MXene significantly improves the electrical conductivity of the PDMS polymer and improves its mechanical properties. The two-dimensional layered structure of MXene plays an important role in composite materials. It can effectively hinder crack propagation, enhance interface bonding, and further optimize the overall performance of the composite material. Through this synergistic modification method, not only the defect of low thermal conductivity of the PDMS polymer itself is overcome, but also its electrical conductivity is improved, so that the composite material has good mechanical properties while also performing well in electromagnetic shielding. The vacuum degassing step during the preparation process effectively eliminates air bubbles within the material, ensuring the density of the composite material. The thermosetting process tightly integrates the multi-scale reinforcements with the PDMS-MXene matrix, forming a stable composite structure. This dense and stable structure not only enhances the mechanical properties of the composite but also further improves its electromagnetic shielding effectiveness and structural stability, ensuring that the material maintains excellent performance in a variety of application environments. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0015] Figure 1 This is the SEM image of the pretreated CF prepared in Example 1; Figure 2 This is a low-magnification SEM image of CF-CNTs prepared in Example 3; Figure 3 This is a high-magnification SEM image of CF-CNTs prepared in Example 3. DETAILED DESCRIPTION
[0016] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.
[0017] In the description of the embodiments of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present application. The terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0018] The present embodiment provides a CNTs and MXene synergistically modified CF reinforced PDMS-based composite material, including steps S1-S5: S1: Under an argon protective atmosphere, a carbon fiber cloth (CF) is placed in a heat treatment furnace and heated to 700-900°C and then kept warm to obtain a pretreated carbon fiber substrate.
[0019] Argon, as an inert gas, can effectively isolate oxygen and prevent carbon fiber from undergoing oxidation reaction with oxygen at high temperature, thus avoiding structural damage and performance degradation, and ensuring that the mechanical properties and chemical stability of carbon fiber are maintained; the specific high-temperature insulation treatment at 700-900℃ can remove residual impurities, organic matter and adsorbed moisture on the surface of carbon fiber, purify the surface, provide good interface conditions for subsequent composite with other materials, and enhance interfacial bonding strength; high-temperature treatment can also improve the microstructure of the carbon fiber surface, increase its surface active sites and roughness, which is conducive to the subsequent in-situ growth of carbon nanotubes on its surface.
[0020] S2: A mixed solution of anhydrous ethanol, ethylenediamine and ferrocene is injected into a heat treatment furnace. Under heat preservation conditions, carbon nanotubes (CNTs) are in situ grown on the surface of the pretreated carbon fiber substrate. After the reaction is completed, the temperature is lowered to room temperature to form a multi-scale reinforcement (CF-CNTs).
[0021] In the embodiment of the present application, the mixed solution is injected into a heat treatment furnace and reacted for 20-60 minutes under insulation conditions.
[0022] It should be noted that the in-situ grown CNTs are directly and tightly combined with the pretreated carbon fiber substrate to form a strong interface, effectively enhancing the stress transfer between the two and improving the mechanical properties of the composite material; the introduction of CNTs forms a multi-scale reinforcement, the carbon fibers provide macroscopic mechanical support, and the CNTs fill the gaps between the carbon fibers and enhance the interface effect at the micro scale, significantly improving the strength, toughness and other mechanical indicators of the composite material; at the same time, this multi-scale reinforcement can also optimize the electromagnetic properties of the material. The CNTs and carbon fibers work synergistically to enhance the scattering and absorption capacity of electromagnetic waves, improve the electromagnetic interference shielding effectiveness, and optimize the mechanical and electromagnetic properties of the composite material.
[0023] S3: Add the deionized MXene solution to the PDMS (polydimethylsiloxane) polymer and stir until uniform. Dry the solution at 80-150°C for 4-6 hours to remove the deionized water, forming a PDMS-MXene matrix. The specific steps for preparing the deionized MXene solution are as follows: First, add MXene powder to deionized water, then disperse it uniformly through ultrasonication to obtain the deionized MXene solution.
[0024] The MXene in the examples of this application is The addition amount of MXene is 0.05-0.2wt.% of the PDMS polymer mass.
[0025] It's important to note that, in terms of mechanical properties, when MXene, a high-strength, high-modulus two-dimensional nanomaterial, is uniformly dispersed within a PDMS polymer, its flakes can absorb external forces, prevent crack propagation, and enhance tensile strength, meeting the tensile performance requirements of flexible electronics. Furthermore, the interfacial interaction between the MXene flakes and PDMS increases energy dissipation and improves the material's toughness, making it suitable for flexible sensors in wearable devices that must withstand repeated bending or impact. Regarding electrical properties, while pure PDMS is insulating, MXene imparts conductivity to PDMS polymers, making them suitable for flexible electrodes and sensors. By controlling the amount of MXene added, the substrate's electrical properties can be precisely tuned, providing greater flexibility in the design and manufacture of flexible electronic devices. Regarding thermal properties, MXene's high thermal conductivity significantly improves the thermal conductivity of PDMS polymers, helping to lower the operating temperature, improve stability, and enhance the lifespan of heat-dissipating electronic devices. MXene can also act as a thermal stabilizer, improving the thermal stability of PDMS polymers. In the field of electromagnetic shielding, the PDMS-MXene matrix can effectively shield electromagnetic waves and reduce the impact of electromagnetic interference on electronic equipment due to the excellent electromagnetic shielding properties of MXene. It has great application potential in fields such as aerospace, military, etc. that have high requirements for electromagnetic shielding materials.
[0026] S4: Add a curing agent to the PDMS-MXene matrix and mix well to obtain a MXene-modified PDMS polymer.
[0027] In the embodiment of the present application, a silicone cross-linking agent is selected as the curing agent.
[0028] In the embodiment of the present application, the mass ratio of the curing agent to the PDMS polymer is 1:(5-20).
[0029] Specifically, the mass of the PDMS polymer is 5-20 g, and the mass of the curing agent is 0.5-2 g.
[0030] In one embodiment of the present application, the mass ratio of the curing agent to the PDMS polymer is 1:10.
[0031] It should be noted that silicone cross-linkers and PDMS polymers can undergo efficient cross-linking reactions, giving the composite material good shape retention and structural stability; precise control of the mass ratio of curing agent to PDMS polymer can ensure that the cross-linking reaction is sufficient and moderate, avoiding excessive hardness and increased brittleness of the matrix due to excessive curing agent, or incomplete cross-linking and insufficient matrix strength due to too little curing agent, thereby optimizing the mechanical properties of the composite material, such as hardness and tensile strength; at the same time, the appropriate curing ratio can also ensure that MXene is evenly distributed in the matrix, maintaining its good electrical conductivity and electromagnetic shielding properties, so that the composite material achieves a good balance between mechanical and functional properties, meeting the needs of various application scenarios.
[0032] S5: The multi-scale reinforcement is immersed in a MXene-modified PDMS polymer, and after vacuum degassing and thermal curing, a CNTs and MXene-synergistically modified CF-reinforced PDMS-based composite material (CF-CNTs / PDMS-MXene) is obtained.
[0033] In the embodiment of the present application, vacuum degassing is performed at room temperature for 5-40 minutes, and the heat curing temperature is 80-200° C., and the curing time is 5-30 minutes.
[0034] It should be noted that vacuum degassing for 5-40 minutes at room temperature can effectively remove bubbles in the composite material system, prevent bubbles from forming defects inside the material, ensure the density of the composite material structure, and improve the stability of its mechanical properties and electromagnetic shielding effectiveness; the thermal curing temperature range of 80-200°C can accurately control the curing degree of the PDMS-MXene matrix, so that it forms a good interface bonding with the multi-scale reinforcement, ensure effective stress transfer, and enhance the overall strength and toughness of the composite material; the curing time of 5-30 minutes can not only ensure that the curing reaction is fully carried out so that the material achieves the expected physical and chemical properties, but also avoid energy waste and material performance degradation due to too long curing time, thereby efficiently preparing a composite material with excellent mechanical properties and electromagnetic shielding properties.
[0035] It should be noted that the carbon fiber cloth was heat-treated at high temperature under argon protection to prevent oxidation of the carbon fibers, creating optimal conditions for subsequent reactions. On this basis, in-situ grown carbon nanotubes and carbon fibers form a multi-scale reinforcement. This multi-scale structure not only enhances the mechanical strength and toughness of the composite, but more importantly, the high aspect ratio of the carbon nanotubes enhances the scattering and absorption of electromagnetic waves, effectively compensating for the shielding performance deficiencies caused by the smooth surface of the carbon fibers. This significantly improves the composite's electromagnetic shielding effectiveness, making it more competitive in the electromagnetic protection field. The addition of MXene significantly improves the conductivity of the PDMS polymer while also enhancing its mechanical properties. The two-dimensional layered structure of MXene plays a crucial role in the composite, effectively hindering crack propagation and strengthening interfacial bonding, further optimizing the overall performance of the composite. This synergistic modification not only overcomes the inherent low thermal conductivity of the PDMS polymer but also enhances its electrical conductivity, resulting in a composite that not only possesses excellent mechanical properties but also outstanding electromagnetic shielding performance. The vacuum degassing step during the preparation process effectively eliminates internal air bubbles and ensures the density of the composite structure. The thermosetting process tightly bonds the multi-scale reinforcements to the PDMS-MXene matrix, forming a stable composite structure. This dense and stable structure not only enhances the mechanical properties of the composite, but also further improves its electromagnetic shielding effectiveness and structural stability, ensuring that the material maintains excellent performance in a variety of application environments.
[0036] Example 1: CF reinforced PDMS-based composite material Under an argon protective atmosphere, the carbon fiber cloth (CF) is placed in a heat treatment furnace, heated to 80°C and then kept warm. After the heat treatment, the temperature of the heat treatment furnace is lowered to room temperature to obtain the pretreated CF. Weigh 1 g of curing agent and add it to 10 g of PDMS polymer while stirring continuously to obtain a PDMS matrix containing the curing agent; The pretreated CF was immersed in a PDMS matrix containing a curing agent, and placed in a vacuum drying oven at room temperature and evacuated for 20 minutes. After being taken out, it was cured in a 150°C forced air drying oven for 15 minutes to obtain a CF-reinforced PDMS-based composite material (CF / PDMS).
[0037] The material's S parameters were tested using a vector network analyzer, and the electromagnetic interference shielding effectiveness (EMI SE) was calculated based on the S parameters. The EMI SE value of CF / PDMS in the X-band (8.2-12.4 GHz) was approximately 19.57 dB, indicating relatively weak electromagnetic shielding effectiveness.
[0038] Example 2: MXene-modified CF-reinforced PDMS-based composite material Under an argon protective atmosphere, the carbon fiber cloth (CF) is placed in a heat treatment furnace, heated to 800°C and then kept warm. After the heat treatment, the temperature of the heat treatment furnace is lowered to room temperature to obtain a pretreated CF. A 0.1 wt.% MXene deionized water solution was added to 10 g of PDMS polymer, stirred evenly with a magnetic stirrer, and then placed in an electric heated forced air drying oven at 100 °C for 5 h to remove the deionized water to form a PDMS-MXene matrix; After drying, 1 g of curing agent was weighed and added to the PDMS-MXene matrix, and stirred continuously to obtain a MXene-modified PDMS polymer. The pretreated CF was immersed in MXene-modified PDMS polymer, placed in a vacuum drying oven, and vacuumed at room temperature for 20 minutes. After being taken out, it was cured in a 150°C forced air drying oven for 15 minutes to obtain a MXene-modified CF reinforced PDMS-based composite material (CF / PDMS-MXene).
[0039] A vector network analyzer was used to measure the material's S-parameters and calculate its electromagnetic interference shielding effectiveness (EMI SE). The results showed that the EMI SE value of CF / PDMS-MXene in the X-band (8.2-12.4 GHz) was approximately 24.03 dB, placing it at a moderate level of electromagnetic shielding effectiveness.
[0040] Example 3: CNTs and MXene synergistically modified CF reinforced PDMS-based composites Under an argon protective atmosphere, a carbon fiber cloth (CF) is placed in a heat treatment furnace and heated to 800°C and then kept warm to obtain a pretreated carbon fiber substrate; A mixed solution of anhydrous ethanol, ethylenediamine, and ferrocene was injected into a heat treatment furnace and reacted for 40 minutes to grow CNTs on the surface of the pretreated carbon fiber substrate. After the reaction, the solution was cooled to room temperature to form a multi-scale reinforcement (CF-CNTs). A 0.1 wt.% MXene deionized water solution was added to 10 g of PDMS polymer and stirred evenly with a magnetic stirrer. The polymer was then placed in an electric heated forced air drying oven at 100 °C for 5 h to remove the deionized water and form a PDMS-MXene matrix. Weigh 1 g of curing agent and add it to the PDMS-MXene matrix while stirring continuously to obtain a MXene-modified PDMS polymer. The multi-scale reinforcement (CF-CNTs) was immersed in the MXene-modified PDMS polymer, placed in a vacuum drying oven, and vacuumed at room temperature for 20 minutes. After being taken out, it was cured in a 150°C forced air drying oven for 15 minutes to obtain a CNTs and MXene synergistically modified CF reinforced PDMS-based composite material (CF-CNTs / PDMS-MXene).
[0041] A vector network analyzer was used to measure the material's S parameters and calculate its electromagnetic interference shielding effectiveness (EMISE). The results showed that the EMISE value of CF-CNTs / PDMS-MXene in the X-band (8.2-12.4 GHz) was approximately 39.34 dB, significantly superior to that of Examples 1 and 2.
[0042] In summary, this application achieves significant breakthroughs in composite material performance through three core innovative technologies. Traditional carbon fibers have a smooth surface and weak bonding with the matrix, which affects the overall performance of the material. This application in-situ grows carbon nanotubes (CNTs) on the carbon fiber surface. These CNTs, like tiny "tentacles," penetrate deeply into the carbon fiber and matrix to form a mechanical interlocking structure, strengthening interfacial bonding and improving mechanical properties and stability. To address the problem of low conductivity of polymer matrices limiting electromagnetic shielding applications, MXene is combined with polydimethylsiloxane (PDMS) to form a PDMS-MXene matrix. The MXene is evenly dispersed to form a highly efficient conductive path. The composite material EMISE using this matrix in Example 2 shows a 23% improvement over Example 1, breaking through the conductivity bottleneck. Furthermore, the one-dimensional tubular structure of CNTs and the two-dimensional sheet structure of MXene form a one-dimensional-two-dimensional composite conductive network. In Example 3, the composite material EMISE using these two synergistic modifications shows a 101% improvement over Example 1, significantly enhancing electromagnetic wave scattering and absorption capabilities. Through these three innovations, the mechanical, conductive and electromagnetic shielding properties of composite materials have been significantly improved, providing better material options for aerospace, electronic packaging, electromagnetic protection and other fields, and has broad application prospects.
[0043] Since PDMS polymer itself is colorless and transparent, the appearance difference between different samples is not obvious during imaging, and the contrast effect of photographing is poor, so this application selects Figure 1-Figure 3 To compare the micromorphologies of the prepared pretreated CF and CF-CNTs.
[0044] like Figure 1 As shown in the SEM image of the pretreated CF prepared in Example 1, it can be clearly seen that the surface of the unmodified carbon fiber cloth is very smooth. This smooth surface characteristic will weaken the bonding strength between it and the matrix to a certain extent, which may have an adverse effect on the overall performance of the composite material.
[0045] Figure 2 The low-magnification SEM morphology of CF-CNTs prepared in Example 3 is shown. It can be clearly observed from the figure that carbon nanotubes (CNTs) grow evenly on the surface of carbon fiber, as if covering the carbon fiber with a layer of fine "hair coat". Figure 3 (High-magnification SEM image of CF-CNTs prepared in Example 3) clearly shows the tight bonding between the CNTs and the carbon fibers. This tight bonding not only increases the roughness of the carbon fiber surface but also helps to form a stronger interface with the matrix, laying a good microstructural foundation for improving the performance of the composite material.
[0046] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.
[0047] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.
Claims
1. A method for preparing a CNTs and MXene synergistically modified CF reinforced PDMS-based composite material, characterized in that: include: S1: Under an argon protective atmosphere, the carbon fiber cloth is placed in a heat treatment furnace and heated to 700-900°C and then kept warm to obtain a pretreated carbon fiber substrate; S2: injecting a mixed solution of anhydrous ethanol, ethylenediamine and ferrocene into a heat treatment furnace, and in situ growing carbon nanotubes on the surface of the pretreated carbon fiber substrate under heat preservation conditions. After the reaction is completed, the temperature is lowered to room temperature to form a multi-scale reinforcement; S3: Add the MXene deionized water solution to the PDMS polymer and stir evenly, then dry at 80-150°C for 4-6 hours to remove the deionized water to form a PDMS-MXene matrix; S4: adding a curing agent to the PDMS-MXene matrix and mixing uniformly to obtain a MXene-modified PDMS polymer; S5: The multi-scale reinforcement is immersed in the MXene-modified PDMS polymer, and after vacuum degassing and thermal curing, a CNTs and MXene synergistically modified CF reinforced PDMS-based composite material is obtained.
2. The method for preparing the CNTs and MXene synergistically modified CF reinforced PDMS-based composite material according to claim 1, characterized in that: In S2, the mixed solution is injected into the heat treatment furnace and reacted for 20-60 minutes under insulation conditions.
3. The method for preparing the CNTs and MXene synergistically modified CF reinforced PDMS-based composite material according to claim 1, characterized in that: In S3, the amount of MXene added is 0.05-0.2 wt.% of the mass of the PDMS polymer.
4. The method for preparing the CNTs and MXene synergistically modified CF reinforced PDMS-based composite material according to claim 1, characterized in that: The mass ratio of the curing agent to the PDMS polymer is 1:(5-20).
5. The method for preparing the CNTs and MXene synergistically modified CF reinforced PDMS-based composite material according to claim 4, characterized in that: The mass of the PDMS polymer is 5-20 g, and the mass of the curing agent is 0.5-2 g.
6. The method for preparing the CNTs and MXene synergistically modified CF reinforced PDMS-based composite material according to claim 1, characterized in that: In S5, the vacuum degassing is performed at room temperature for 5-40 minutes; the heat curing temperature is 80-200° C., and the curing time is 5-30 minutes.
7. The method for preparing the CNTs and MXene synergistically modified CF reinforced PDMS-based composite material according to claim 1, characterized in that: The MXene is .
8. The method for preparing the CNTs and MXene synergistically modified CF reinforced PDMS-based composite material according to claim 1, characterized in that: The curing agent is a silicon-based cross-linking agent.
9. The method for preparing the CNTs and MXene synergistically modified CF reinforced PDMS-based composite material according to claim 1, characterized in that: In S3, MXene powder is added to deionized water and uniformly dispersed by ultrasound to obtain a MXene deionized water solution.