Method for efficiently dispersing carbon nanotubes in a liquid thermoplastic resin

Abstract

The application relates to the technical field of composite materials, in particular to a preparation method for efficiently dispersing carbon nanotubes in liquid thermoplastic resin. The method comprises the following steps: S1. raw material preparation; S2. preparation of carbon nanotube modified resin dispersion liquid; S3. curing system configuration and defoaming; S4. fiber layer prepreg preparation; S5. vacuum assisted resin transfer molding; S6. thermal curing molding; S7. post-processing and sample processing. The application adopts a surfactant to assist the dispersion of carbon nanotubes in liquid thermoplastic resin, and combines a vacuum assisted resin transfer molding process, so that the carbon nanotubes can be uniformly and stably dispersed in the resin system, the fiber / resin interface bonding and the interlaminar load transfer capacity can be improved, and the interlaminar fracture toughness and the comprehensive mechanical properties of the composite material are improved.

Description

Technical Field

[0001] This invention relates to the field of composite materials technology, and in particular to a method for preparing carbon nanotubes for efficient dispersion in liquid thermoplastic resin. Background Technology

[0002] Currently, to improve the interlaminar properties, impact resistance, and fatigue stability of fiber-reinforced resin matrix composites, modification by introducing nano-reinforcing phases into the resin matrix is ​​commonly employed. Among these, carbon nanotubes, due to their high strength, high modulus, and high specific surface area, are widely considered effective nanofillers for improving the interfacial properties and interlaminar fracture toughness of composites. In existing technologies, carbon nanotube modification is mainly applied to thermosetting resin systems such as epoxy resins and unsaturated polyester resins. Common methods include direct mechanical stirring dispersion, high-shear dispersion, ultrasonic dispersion, surface oxidation functionalization, and dispersion assisted by surfactants or dispersants. For thermoplastic resin composites, especially liquid thermoplastic acrylic resin systems such as Elium resin, their low viscosity at room temperature, vacuum casting molding capability, and melt-recyclability have led to their recognition as having promising engineering application prospects in recent years. However, compared to traditional thermosetting systems, research on the stable dispersion of carbon nanotubes in liquid thermoplastic resins and their interfacial synergistic effects with reinforcing fibers and the resin matrix is ​​still relatively limited, and existing technologies lack mature, stable, and scale-up process schemes.

[0003] While existing technologies also employ methods such as surface functionalization or high-shear dispersion to improve the dispersibility of carbon nanotubes, some shortcomings remain: First, some chemical functionalization methods are complex and costly, and may damage the intrinsic structure of carbon nanotubes; second, relying solely on mechanical stirring or ultrasonic dispersion is insufficient to stably suppress the re-aggregation of carbon nanotubes in the long term; third, existing technologies focus more on thermosetting resin systems, and in liquid thermoplastic resin systems, especially in Elium resin-based fiber-reinforced composite systems, there is still a lack of a systematic process solution that balances uniform dispersion of carbon nanotubes, resin wettability, interfacial bonding, and interlayer performance improvement. Summary of the Invention

[0004] This invention provides a method for preparing carbon nanotubes that are efficiently dispersed in liquid thermoplastic resins. It aims to solve the problems in the prior art where carbon nanotubes are prone to agglomeration in liquid thermoplastic resins, have insufficient dispersion stability, and have limited synergistic effects with fiber reinforcing phases such as ultra-high molecular weight polyethylene fibers and carbon fibers and resin matrix interfaces, thus making it difficult to fully exert their reinforcing and toughening effects.

[0005] This invention provides a method for preparing carbon nanotubes for efficient dispersion in liquid thermoplastic resin, comprising the following steps:

[0006] S1. Raw material preparation: Ultra-high molecular weight polyethylene fiber woven fabric is selected as the reinforcing material, liquid thermoplastic acrylic resin is selected as the resin matrix, benzoyl peroxide is selected as the curing system, multi-walled carbon nanotubes are selected as the nano-reinforcing material, and nonionic surfactants containing aromatic groups and polyoxyethylene segments are selected as dispersing agents.

[0007] S2. Preparation of carbon nanotube modified resin dispersion: The resin matrix is ​​divided into two parts. A predetermined amount of multi-walled carbon nanotubes is added to the resin matrix of the first part. When a surfactant is required to assist dispersion, a dispersing agent is added at the same time. The first mechanical stirring is performed to form a premix. After mechanical stirring, the premix is ​​ultrasonically dispersed under water bath conditions to obtain a predispersed system. The predispersed system is mixed with the resin matrix of the second part and then ultrasonically dispersed to obtain a dispersion system.

[0008] S3. Curing system preparation and degassing: Add curing agent to the dispersion system and perform a second mechanical stirring until the mixture is uniform; place the uniformly mixed resin system in a vacuum drying environment to degas, and obtain the modified resin;

[0009] S4. Preparation of fiber layup preform: lay up ultra-high molecular weight polyethylene fiber woven fabric, and pre-create crack initiation points in the middle of the layup to obtain a fiber layup preform;

[0010] S5. Vacuum-assisted resin injection molding: The fiber layup preform is placed in a mold, sealed under vacuum, and then modified resin is introduced at room temperature. The modified resin fully impregnates the fiber layup preform under vacuum pressure difference and completes the overall injection.

[0011] S6. Thermosetting molding: After resin infusion is completed, the laminate in the mold is polymerized and cured to obtain carbon nanotube modified thermoplastic composite laminate.

[0012] S7. Post-treatment and sample processing: After curing, the laminate is demolded and processed into standard samples.

[0013] As a further improvement of the present invention, the amount of benzoyl peroxide added is 2 wt% of the resin matrix, and the amount of multi-walled carbon nanotubes added is 0.01 wt% to 0.15 wt% of the resin matrix.

[0014] As a further improvement of the present invention, the amount of the dispersing agent added is configured to be 20 wt% to 150 wt% of the mass of multi-walled carbon nanotubes.

[0015] As a further improvement of the present invention, the dispersing agent is an aromatic carbon nanotube aqueous dispersant.

[0016] As a further improvement of the present invention, in S2, the conditions for the first mechanical stirring are as follows: the premix is ​​placed in a magnetic stirrer and stirred at a speed of 2000 r / min for 15 min at room temperature to initially break up the carbon nanotube aggregates.

[0017] As a further improvement of the present invention, in S2, the conditions for ultrasonic dispersion under water bath conditions are as follows: the premixed liquid after mechanical stirring is transferred to a centrifuge tube, placed in an ultrasonic cleaner, and ultrasonically dispersed under water bath conditions, with the water bath temperature controlled at 25~30℃, ultrasonic time at 30min, ultrasonic power at 200W, and frequency at 40kHz.

[0018] As a further improvement of the present invention, in S2, the ultrasonic dispersion conditions after mixing the pre-dispersed system with the resin matrix of the second part are as follows: after mixing the dispersion system with the resin matrix, the mixture is placed in an ultrasonic disperser and dispersed for 40 minutes, and an intermittent ultrasonic mode is used: 10 seconds of ultrasonication followed by 2 seconds of intermittent dispersibility.

[0019] As a further improvement of the present invention, in S3, the degassing process conditions are specifically as follows: the uniformly mixed resin system is placed in a vacuum drying oven and degassed for 20 minutes under a vacuum of -0.1 MPa.

[0020] As a further improvement of the present invention, in S6, the polymerization and curing conditions of the laminate are as follows: the laminate is placed at 80°C for 5 hours for heat preservation and curing, so that the resin matrix can complete the polymerization and curing under the initiation of benzoyl peroxide.

[0021] The beneficial effects of this invention are: by using surfactants to assist the dispersion of carbon nanotubes in liquid thermoplastic resin, and combining it with vacuum-assisted resin injection molding process, carbon nanotubes can obtain a more uniform and stable dispersion state in the resin system, while improving the fiber / resin interface bonding and interlaminar load transfer capability, thereby enhancing the interlaminar fracture toughness and comprehensive mechanical properties of fiber-reinforced composite materials. Attached Figure Description

[0022] Figure 1 This is a flowchart illustrating the preparation method of the present invention for efficiently dispersing carbon nanotubes in liquid thermoplastic resin.

[0023] Figure 2 This is a comparison diagram of the interlaminar fracture toughness of different systems in this invention;

[0024] Figure 3 This is a comparison diagram of the type II interlaminar fracture toughness of different systems in this invention;

[0025] Figure 4 These are the FTIR results under various operating conditions in this invention;

[0026] Figure 5 These are SEM images of the fracture surfaces of composite materials with different formulations after DCB testing in this invention; (a) unmodified; (b) 0.1wt% MWCNTs; (c) 0.1wt% MWCNTs + TNWDIS;

[0027] Figure 6 These are SEM images of the fracture surfaces of different systems in this invention: (a) Unmodified; (b) 0.05wt% MWCNTs; (c) 0.05wt% MWCNTs + TNWDIS. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] This invention uses multi-walled carbon nanotubes to modify liquid thermoplastic resin, and then uses surfactant-assisted dispersion to prepare composite laminates using a vacuum-assisted resin injection process. The preparation process is as follows: Figure 1 As shown. The reinforcement used is ultra-high molecular weight polyethylene fiber woven fabric, and the resin matrix is ​​Elium. ® 188, the curing agent is benzoyl peroxide (BPO), and the surfactant is an aromatic carbon nanotube aqueous dispersant, preferably TNWDIS (a carbon nanotube aqueous dispersant produced by Chengdu Organic Chemistry Co., Ltd., Chinese Academy of Sciences) or Triton X-100 (Dow Chemical). Figure 2 and Figure 3 As shown, the actual amounts of MWCNTs added included: 0.01wt%, 0.03wt%, 0.05wt%, 0.10wt%, and 0.15wt%, with corresponding numbers C01, C03, C05, C10, and C15; the systems with added surfactants were TNWDIS + the above concentrations of MWCNTs, with corresponding numbers TC01, TC03, TC05, TC10, and TC15.

[0030] Specifically, the preparation method for efficiently dispersing carbon nanotubes in liquid thermoplastic resin includes the following steps:

[0031] S1. Raw material preparation:

[0032] S11. The reinforcing material is ultra-high molecular weight polyethylene fiber woven fabric, model QuantaFlex. TM PEP, with a surface density of 172 g / m³ 2The fabric structure is plain weave. The amount of reinforcing material used as the continuous reinforcing phase of the composite material is determined according to the target laminate thickness, layup method and vacuum-assisted resin injection molding requirements; in the embodiments of the present invention, the fiber preform is preferably formed by the [0 / 90]8 layup method.

[0033] S12. The resin matrix is ​​selected from liquid thermoplastic acrylic resin, preferably Elium. ® Elium® 188, with an initial viscosity of approximately 100 mPa·s at 25°C, serves as the continuous matrix of the system, playing a crucial role in bonding the components, transferring stress, and curing. Its low viscosity at 25°C ensures sufficient resin penetration into the fiber gaps, effectively eliminating voids and guaranteeing a tight wetting and composite between the fibers and resin. The resin molecular chains can undergo free radical cross-linking polymerization under the action of an initiator, transforming from a liquid linear structure into a stable three-dimensional network solid structure, firmly bonding the fibers and nanofillers into a unified whole.

[0034] S13. The curing system uses benzoyl peroxide (BPO), which is added at 2 wt% of the resin matrix. Benzoyl peroxide (BPO) is a resin free radical curing initiator. Its molecule contains low bond energy peroxide bonds, which can homolytically cleave at room temperature to generate active benzoyl free radicals, triggering the cross-linking polymerization reaction of the carbon-carbon double bonds of acrylic resin, promoting the resin to solidify from the liquid state and form a dense and stable three-dimensional network structure.

[0035] S14. The nano-reinforcing phase is multi-walled carbon nanotubes (MWCNTs) with an average diameter of 3-15 nm and a length of 15-30 μm. These nanotubes are carboxyl-functionalized to a purity >99%. The amount of MWCNTs added is 0.01 wt% to 0.15 wt% of the resin matrix.

[0036] The MWCNT dosage is limited to 0.01 wt%~0.15 wt% of the resin mass: too low a dosage cannot construct an effective nano-stress network, resulting in weak reinforcement; too high a dosage easily leads to carbon nanotube aggregation and increased resin viscosity, which is not conducive to vacuum casting molding, and may also adsorb curing initiators, reducing the degree of resin crosslinking. The preferred range is 0.03 wt%~0.10 wt%, in which carbon nanotubes can be uniformly dispersed and build a continuous micro-reinforcing network, which can inhibit the propagation of matrix cracks and achieve toughening and reinforcement. At the same time, the system viscosity is moderate, which is suitable for vacuum flow process, and will not interfere with the free radical curing reaction of resin, resulting in the best overall performance.

[0037] S15. The dispersing agent is a nonionic surfactant, preferably an aromatic aqueous dispersant for carbon nanotubes. Its number-average molecular weight is 3500–4500 Da, HLB value is 12–14, and critical micelle concentration is 0.05–0.1 g / L. This surfactant contains aromatic groups and polyoxyethylene segments in its molecular structure, making it suitable for non-covalent assisted dispersion of carbon nanotubes in the Elium system.

[0038] This invention relies on a nonionic surfactant, specifically an aromatic aqueous dispersant for carbon nanotubes. Stable dispersion is achieved through π-π non-covalent adsorption of aromatic groups onto the carbon nanotube surface and steric hindrance provided by the polyethylene oxide segments, under ultrasonic cavitation. In other words, the surfactant of this invention serves both "ultrasonic depolymerization" and interface regulation functions.

[0039] S16. The amount of aromatic carbon nanotube aqueous dispersant added is configured at 20 wt% to 150 wt% of the mass of MWCNTs, preferably 60 wt%, to balance the uniformity of carbon nanotube dispersion and interfacial compatibility.

[0040] S2. Preparation of carbon nanotube modified resin dispersion: This system uses a two-step process of "mechanical stirring + ultrasonic dispersion" to prepare carbon nanotube dispersed resin.

[0041] This invention targets liquid thermoplastic resin systems and employs a dispersion strategy that combines physical and mechanical methods (mechanical stirring + ultrasonic cavitation). The dispersion principle utilizes the non-covalent adsorption of surfactant molecules on the surface of carbon nanotubes, preventing their re-aggregation through steric hindrance, thereby achieving stable and uniform dispersion of carbon nanotubes in low-viscosity thermoplastic resins. Stable dispersion is achieved by relying on the interfacial modification of surfactants.

[0042] S21. Premixing: Weigh 40g of Elium resin, add the predetermined amount of MWCNTs, and simultaneously add an aromatic aqueous carbon nanotube dispersant at a ratio of 60 wt% of the multi-walled carbon nanotubes when surfactant-assisted dispersion is required. Then perform premixing. Premixing by using a small portion of the Elium resin first allows the carbon nanotubes to bind with the dispersant beforehand, resulting in a smaller volume and easier experimental operation.

[0043] S22. First mechanical stirring: Place the above premix in a magnetic stirrer and stir at 2000 r / min for 15 min at room temperature to initially break up the carbon nanotube aggregates.

[0044] S23. Water Bath Dispersion: The premixed liquid after mechanical stirring is transferred to a centrifuge tube and placed in an ultrasonic cleaner for ultrasonic dispersion under water bath conditions to obtain a pre-dispersed system. The water bath temperature is controlled at 25~30℃, the ultrasonic time is 30min, the ultrasonic power is 200W, and the frequency is 40kHz. This step enhances the binding of the liquid in the system through ultrasonic vibration, promotes the rapid adsorption of the dispersant to the surface of carbon nanotubes, further depolymerizes the carbon nanotube bundles, and improves their initial dispersion uniformity in low-viscosity Elium resin. The ultrasonic cleaner uses a transducer at the bottom of the tank and indirect sound transmission in the water bath, focusing on surface exfoliation. It can be used for the initial light pre-dispersion and simple overall homogenization treatment of the carbon nanotube resin suspension in this system.

[0045] S24. Ultrasonic Dispersion: The pre-dispersed system described above is mixed with another 230g of Elium resin, and then placed in an ultrasonic disperser for 40 minutes to obtain the final dispersion system. With the carbon nanotubes and dispersant already combined in the pre-dispersion system, a large volume of Elium resin is added and mixed with ultrasound for further dispersion. To avoid excessive local temperature rise during ultrasound, which could lead to premature resin polymerization or affect subsequent infusion performance, an intermittent ultrasound mode is used: 10 seconds of ultrasound followed by a 2-second interval. The ultrasonic disperser is a probe type, which more easily generates large cavitation bubbles with extremely strong shear force, suitable for breaking up particle agglomerates and dispersing nanoparticles, and is suitable for strong deagglomeration. The ultrasound temperature is controlled between 60-70℃.

[0046] S3. Curing System Preparation and Degassing: Add 2wt% BPO curing agent to the dispersed carbon nanotube modified Elium resin, and mechanically stir at room temperature until homogeneous. Then place the homogeneous resin system in a vacuum drying oven and degas for 20 minutes under a vacuum of -0.1 MPa to remove air bubbles introduced during the aforementioned stirring and ultrasonication processes.

[0047] S4. Preparation of Fiber Layup Preform: For specimens testing fracture toughness, ultra-high molecular weight polyethylene (UHMWPE) fiber woven fabric is laid in an [0 / 90]8 layer configuration, where 0 / 90 represents the fiber bundle direction and 8 indicates an 8-layer stacked structure. Copper foil is embedded in the middle of the layup as a pre-crack initiation point: for example, a 40mm long copper foil is embedded in the DCB specimen; a 45mm long copper foil is embedded in the 3ENF specimen; to obtain the fiber layup preform. Depending on the testing requirements, other materials, such as polytetrafluoroethylene (PTFE) film, can be used instead of copper foil.

[0048] S5. Vacuum-assisted resin injection molding: Under the conventional VARI auxiliary material system, the fiber layup preform is placed in a mold, sealed under vacuum, and then modified resin is introduced at room temperature. The resin fully impregnates the ultra-high molecular weight polyethylene fiber layer under the action of vacuum pressure difference and completes the overall injection.

[0049] S6. Thermosetting molding: After resin infusion, the laminate is placed at 80°C for 5 hours to allow the Elium resin to polymerize and cure under the initiation of BPO, resulting in a carbon nanotube modified thermoplastic composite laminate.

[0050] S7. Post-treatment and sample processing: After curing, the laminate is demolded and processed into standard samples using waterjet cutting. The sample dimensions are as follows: DCB and 3ENF sample dimensions are 160mm × 25 × 2.8mm.

[0051] Compared with the prior art, the present invention has the following advantages:

[0052] (1) It can significantly improve the interlaminar fracture toughness of composite materials, especially the interlaminar fracture performance of type II. Figure 3 The results show that the average type II interlaminar fracture toughness of the unmodified system is 2.30 kJ / m. 2 The addition of 0.03 wt% MWCNTs increased the efficiency to 4.30 kJ / m³. 2 The modulus improved by approximately 87.0% compared to the unmodified system; further addition of TNWDIS to the same concentration of MWCNTs further increased the type II interlaminar fracture toughness to 5.81 kJ / m. 2 This represents an increase of approximately 35.1% compared to the same concentration system without surfactant. For example... Figure 2 As shown, the interlaminar fracture toughness of type I also shows an improving trend, indicating that the present invention has a significant effect on improving the interlaminar crack resistance and delamination resistance.

[0053] (2) Significantly improves the dispersion state of carbon nanotubes in thermoplastic resins and reduces agglomeration defects. This invention utilizes the synergistic effect of the nonionic surfactant TNWDIS with multi-walled carbon nanotubes. Through non-covalent adsorption, steric hindrance effect, and good compatibility with the MMA / PMMA system, carbon nanotubes achieve a more uniform and stable dispersion state in Elium resin, thereby avoiding stress concentration and weak interfacial regions caused by van der Waals forces agglomeration of high-content carbon nanotubes. Figure 4 As shown, the FTIR results demonstrate that the enhancement mechanism of this system is mainly manifested in physical dispersion and interface regulation, rather than chemical reconstruction that destroys the main structure of the resin.

[0054] (3) It can effectively enhance the bonding between the fiber and resin interface and improve the efficiency of interlayer load transfer. After the introduction of carbon nanotubes, a more effective stress transfer channel can be formed between the interlayer resin region and the fiber / resin interface, and the interface synergistic load-bearing capacity can be improved through bridging, pull-out, crack deflection and crack pinning mechanisms. Figure 5 , Figure 6As shown in the SEM results, the introduction of TNWDIS is key to fully realizing the toughening effect of MWCNTs. Compared with the addition of MWCNTs alone, the MWCNTs+TNWDIS system exhibits stronger matrix coverage and interfacial drag in type I, and wider resin coverage and shear tear texture in type II, indicating more effective interfacial adhesion and a larger plastic energy dissipation zone. This demonstrates that this synergistic system can simultaneously activate multiple energy dissipation processes such as interfacial reinforcement, crack deflection, bridging / pull-out, and matrix shear yielding, providing clear microstructure support for improving the interlaminar fracture toughness of ultra-high molecular weight polyethylene / Elium composites.

[0055] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A method for preparing carbon nanotubes for efficient dispersion in liquid thermoplastic resin, characterized in that, Includes the following steps: S1. Raw material preparation: Ultra-high molecular weight polyethylene fiber woven fabric is selected as the reinforcing material, liquid thermoplastic acrylic resin is selected as the resin matrix, benzoyl peroxide is selected as the curing system, multi-walled carbon nanotubes are selected as the nano-reinforcing material, and nonionic surfactants containing aromatic groups and polyoxyethylene segments are selected as dispersing agents. S2. Preparation of carbon nanotube modified resin dispersion: The resin matrix is ​​divided into two parts. A predetermined amount of multi-walled carbon nanotubes is added to the resin matrix of the first part. When a surfactant is required to assist dispersion, a dispersing agent is added at the same time. The first mechanical stirring is performed to form a premix. After mechanical stirring, the premix is ​​ultrasonically dispersed under water bath conditions to obtain a predispersed system. The predispersed system is mixed with the resin matrix of the second part and then ultrasonically dispersed to obtain a dispersion system. S3. Curing system preparation and degassing: Add curing agent to the dispersion system and perform a second mechanical stirring until the mixture is uniform; place the uniformly mixed resin system in a vacuum drying environment to degas, and obtain the modified resin; S4. Preparation of fiber layup preform: lay up ultra-high molecular weight polyethylene fiber woven fabric, and pre-create crack initiation points in the layup to obtain fiber layup preform; S5. Vacuum-assisted resin injection molding: The fiber layup preform is placed in a mold, sealed under vacuum, and then modified resin is introduced at room temperature. The modified resin fully impregnates the fiber layup preform under vacuum pressure difference and completes the overall injection. S6. Thermosetting molding: After resin infusion is completed, the laminate in the mold is polymerized and cured to obtain carbon nanotube modified thermoplastic composite laminate. S7. Post-treatment and sample processing: After curing, the laminate is demolded and processed into standard samples.

2. The method for preparing carbon nanotubes for efficient dispersion in liquid thermoplastic resin according to claim 1, characterized in that, The amount of benzoyl peroxide added is 2 wt% of the resin matrix, and the amount of multi-walled carbon nanotubes added is 0.01 wt% to 0.15 wt% of the resin matrix.

3. The method for preparing carbon nanotubes for efficient dispersion in liquid thermoplastic resin according to claim 1, characterized in that, The dispersing agent is added at a rate of 20 wt% to 150 wt% of the mass of the multi-walled carbon nanotubes.

4. The method for preparing carbon nanotubes for efficient dispersion in liquid thermoplastic resin according to claim 1, characterized in that, The dispersing agent is an aromatic carbon nanotube aqueous dispersant.

5. The method for preparing carbon nanotubes for efficient dispersion in liquid thermoplastic resin according to claim 1, characterized in that, In S2, the conditions for the first mechanical stirring are as follows: the premix is ​​placed in a magnetic stirrer and stirred at a speed of 2000 r / min for 15 min at room temperature to initially break up the carbon nanotube aggregates.

6. The method for preparing carbon nanotubes for efficient dispersion in liquid thermoplastic resin according to claim 1, characterized in that, In S2, the conditions for ultrasonic dispersion under water bath conditions are as follows: the premixed liquid after mechanical stirring is transferred to a centrifuge tube, placed in an ultrasonic cleaner, and ultrasonically dispersed under water bath conditions, with the water bath temperature controlled at 25~30℃, ultrasonic time at 30min, ultrasonic power at 200W, and frequency at 40kHz.

7. The method for preparing carbon nanotubes for efficient dispersion in liquid thermoplastic resin according to claim 1, characterized in that, In S2, the ultrasonic dispersion conditions after mixing the pre-dispersed system with the resin matrix of the second part are as follows: after mixing the dispersion system with the resin matrix, place it in an ultrasonic disperser and continue to disperse for 40 minutes, using an intermittent ultrasonic mode: 10 seconds of ultrasonication followed by 2 seconds of intermittent dispersibility.

8. The method for preparing carbon nanotubes for efficient dispersion in liquid thermoplastic resin according to claim 1, characterized in that, In S3, the degassing process conditions are as follows: the uniformly mixed resin system is placed in a vacuum drying oven and degassed for 20 minutes under a vacuum of -0.1 MPa.

9. The method for preparing carbon nanotubes for efficient dispersion in liquid thermoplastic resin according to claim 1, characterized in that, In S6, the polymerization and curing conditions of the laminate are as follows: the laminate is placed at 80°C for 5 hours to allow the resin matrix to complete polymerization and curing under the initiation of benzoyl peroxide.

Images