Carbon nanotube composite material as well as preparation method and application thereof

Abstract

The invention discloses a carbon nanotube composite material as well as a preparation method and application thereof. The carbon nano tube composite material comprises an energy absorption layer serving as a middle layer, and an anti-impact layer and a sunken part reducing layer which are arranged on the two sides of the energy absorption layer respectively. The energy absorption layer comprises a plurality of layers of carbon nanotube films which are arranged in a laminated manner; each of the anti-impact layer and the sunken part reducing layer comprises at least one of a UHMWPE (Ultra High Molecular Weight Polyethylene) fiber layer, a Kevlar fiber layer and a PBO (Poly (p-phenylene benzobisoxazole)) fiber layer. According to the carbon nano tube composite material provided by the invention, performance advantages of various materials are fully played mainly through collaborative design of various materials, a collaborative protection and layered energy absorption mechanism is formed, and the carbon nano tube composite material has excellent impact resistance, is superior to a traditional single fiber material in key performance aspects such as a V50 value, a specific energy absorption index and concave depth, and has good application prospects. The cable has excellent high and low temperature resistance, humidity and heat resistance, acid and alkali resistance and salt spray corrosion resistance, is suitable for various extreme service environments, and is suitable for individual protection equipment such as body armor and stab-resistant clothing.

Description

TECHNICAL FIELD

[0001] The present application relates to a carbon nanotube composite material, in particular to a carbon nanotube composite material with excellent impact resistance and a preparation method and application thereof, and belongs to the technical field of impact-resistant materials. BACKGROUND

[0002] In the current rapidly developing modern warfare mode and increasingly complex security challenges, impact-resistant materials play a crucial role in individual protection, military armor, aerospace structures, and low-altitude aircraft applications. With the diversification of weapon systems, high-speed, and the universalization of extreme combat environments, the types of loads faced by materials are becoming increasingly complex, such as high-speed projectile impact, blast shock wave, and hard debris invasion. These impacts not only require materials to have extremely high energy absorption capacity, but also require them to have long-term stability and high reliability in complex environments such as high temperature, low temperature, strong corrosion, and salt spray. Therefore, developing a new generation of impact-resistant materials with high strength, high energy absorption, lightweight flexibility, and environmental adaptability has become an important direction for the development of current material technology.

[0003] The current widely used impact-resistant materials include aramid (Kevlar), ultra-high molecular weight polyethylene (UHMWPE), polybenzoxazole (PBO), polyimide (PI), carbon fiber, glass fiber, and other high-performance fibers and their composite structures. These materials mostly have high specific strength, good flexibility, and puncture resistance, but still have the following shortcomings:

[0004] 1. Single energy dissipation mechanism, material structure design is mostly homogeneous lamination, difficult to achieve multi-scale energy absorption path, leading to insufficient impact resistance efficiency;

[0005] 2. Limited material interface bonding force, composite structure is prone to interlayer separation, fiber fracture or matrix cracking under high-speed impact;

[0006] 3. Performance decay is significant under extreme conditions (such as below -40℃ low temperature, high humidity, high salt, strong acid and alkali), which cannot meet the requirements of long-term complex tasks;

[0007] 4. In order to improve the impact resistance, the thickness or weight is often increased, thereby sacrificing the lightweight and flexibility of the material, affecting the mobility and comfort of the user.

[0008] In addition, the protective structure of traditional impact-resistant materials mostly relies on single functional layer or planar lamination form, which is difficult to effectively coordinate the contradiction between mechanical properties, comfort and environmental adaptability. SUMMARY

[0009] The main purpose of the present application is to provide a carbon nanotube composite material with excellent impact resistance and a preparation method thereof to overcome the deficiencies in the prior art.

[0010] Another purpose of the present application is to provide an application of the carbon nanotube composite material.

[0011] To achieve the above-mentioned purposes, the technical solutions adopted by the present application include:

[0012] The present application provides a carbon nanotube composite material, which comprises an energy-absorbing layer as an intermediate layer, and an impact-resistant layer and a concave-reducing layer arranged on both sides of the energy-absorbing layer, respectively.

[0013] The energy-absorbing layer comprises a plurality of carbon nanotube films stacked in layers; and the impact-resistant layer and the concave-reducing layer each comprise at least one of a UHMWPE fiber layer, a Kevlar fiber layer, and a PBO fiber layer.

[0014] Further, the impact-resistant layer is a front-impact layer, and the concave-reducing layer is a back-impact layer.

[0015] In some embodiments, the energy-absorbing layer is formed by laying a plurality of carbon nanotube composite films, each of which is formed by compounding a carbon nanotube film with a thermoplastic resin as a binder.

[0016] The present application also provides a preparation method of the carbon nanotube composite material, which comprises laying an impact-resistant layer, an energy-absorbing layer, and a concave-reducing layer, and then performing cold pressing treatment to obtain the carbon nanotube composite material.

[0017] The present application also provides an application of the carbon nanotube composite material in the field of individual protection, specifically, an application in a bulletproof vest or a stab-resistant garment.

[0018] Correspondingly, the present application also provides an impact-resistant material comprising the carbon nanotube composite material.

[0019] Compared with the prior art, the present application has at least the following beneficial effects:

[0020] 1) The carbon nanotube composite material with excellent impact resistance provided by the present application is mainly designed by synergizing a plurality of materials, including the hybrid design of a plurality of high-performance materials such as carbon nanotube films, PBO, aramid fiber, and UHMWPE, so as to fully exert the performance advantages of various materials and form a synergistic protection and layered energy-absorbing mechanism.

[0021] 2) The carbon nanotube composite material with excellent impact resistance provided by the application is superior to traditional single fiber materials in V50 value, specific energy absorption index, and key performance such as dent depth; has strong environmental adaptability, has excellent high and low temperature resistance, moisture and heat resistance, acid and alkali resistance, and salt mist corrosion resistance, is suitable for various extreme service environments, and is suitable for individual protective equipment such as bulletproof vests and stab-resistant clothing. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 A structural schematic diagram of a carbon nanotube composite material with excellent impact resistance in a typical embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to solve the above problems, in recent years, nano-reinforced impact-resistant composite materials have been gradually developed, especially carbon nanotube (CNT) film-based composite systems, which have ultra-high tensile strength, modulus and excellent specific energy absorption performance, and have become an important supporting material for promoting the structural design and innovation of impact-resistant materials.

[0025] The carbon nanotube film not only can disperse and absorb impact load at the nanometer scale, but also can form an energy dissipation network through multi-layer stacking; its excellent flexibility and heat and electrical conductivity also make it possible to be multifunctional. Especially when it is combined with UHMWPE, aramid fiber, PBO and other fibers to form a gradient density and multiphase synergistic structure, it can significantly improve the structural integrity and energy absorption efficiency of the composite material under high-speed impact load. Therefore, the carbon nanotube material is a nano material structure system that has both "softness" and "toughness", and has both "low" and "strong". In addition, the light weight, flexibility, ultra-high energy absorption and corrosion and flame resistance of carbon nanotubes determine that carbon nanotubes are one of the ideal materials in the field of new protection.

[0026] In view of the limitations of existing protective materials in impact resistance, lightweight, flexibility and environmental adaptability, the present inventors propose a carbon nanotube composite material structure design with excellent impact resistance and its preparation and application method based on systematic research on the performance of carbon nanotube materials and their composite behavior with various high-performance fibers. Compared with traditional homogeneous layered structures, the present invention constructs a three-functional partition structure of bullet-facing layer-energy dissipation layer-cushioning layer, combines the advantages of multi-layer CNT film and high-performance fibers, breaks through the bottlenecks of weak interface bonding, uncontrollable damage after impact, poor material comfort, etc., and takes into account the mechanical properties, comfort and environmental adaptability, while improving the protection efficiency and realizing material lightweight, providing a new material solution for individual protective equipment and other applications.

[0027] The technical scheme, its implementation process and principles will be further explained as follows. However, it should be understood that the above technical features of the present invention and the technical features specifically described in the following (examples) can be combined with each other to form new or preferred technical schemes within the scope of the present invention. Due to the limited space, they will not be listed one by one here.

[0028] As an aspect of the present invention, a carbon nanotube composite material includes an energy-absorbing layer as an intermediate layer, and an impact-resistant layer (bullet-facing surface) and a depression-reducing layer (back-popping surface) respectively arranged on both sides of the energy-absorbing layer.

[0029] The energy-absorbing layer includes a plurality of layers of carbon nanotube films (CNTF) stacked; the impact-resistant layer and the depression-reducing layer each include at least one of an ultra-high molecular weight polyethylene (UHMWPE) fiber layer, an aramid (Kevlar) fiber layer, and a PBO fiber layer.

[0030] The composite material of the present invention includes one or a combination of carbon nanotube films (CNTF), ultra-high molecular weight polyethylene (UHMWPE), aramid (Kevlar) or PBO layers, adopts a hybrid structure design, the UHMWPE layer is located on the bullet-facing surface to reduce the speed of the bullet and resist penetration, the carbon nanotube film is located in the intermediate layer to efficiently absorb energy and diffuse energy, the UHMWPE layer is used on the back-popping surface to reduce the depression, and the UHMWPE layer can be replaced by a Kevlar or PBO fiber layer to optimize the performance.

[0031] In some embodiments, the energy-absorbing layer is formed by laying multiple carbon nanotube composite films, each of which is formed by compounding a carbon nanotube film with a thermoplastic resin as a binder, to increase the force between carbon nanotube bundles and enhance the interface effect. The thermoplastic resin acts as a crosslinking agent, and the carbon nanotubes form a network structure with certain pores. After compounding with the thermoplastic resin, the carbon nanotubes are welded together, increasing the connection strength between carbon nanotubes and thus the strength of the carbon nanotube film.

[0032] Further, the number of layers of the carbon nanotube composite film is 50-300.

[0033] In some specific embodiments, the carbon nanotube film is prepared by a chemical vapor deposition method and subjected to post-treatment processes such as acid treatment and mechanical drawing to enhance the orientation degree of the carbon nanotube film.

[0034] In some specific embodiments, the single-layer thickness of the carbon nanotube film is 5-20 μm.

[0035] In some specific embodiments, the thermoplastic resin includes one or a combination of more than one of polyvinyl alcohol, polyurethane, nylon 6, etc., but is not limited thereto.

[0036] In some specific embodiments, the carbon nanotube composite film is laid in a cross-laying manner, and the carbon nanotube film has a certain orientation, i.e., 0° / 90° cross-laying. The present application uses a carbon nanotube film to reinforce the intermediate layer, enhance the interface bonding force and the interlayer energy transmission efficiency, and effectively avoid the delamination problem.

[0037] Further, the thickness of the carbon nanotube composite film before hot pressing is 3-17 μm, and the thickness decreases after hot pressing.

[0038] In some embodiments, the impact-resistant layer and the depression-reducing layer each include a combination of at least one of UHMWPE fibers, Kevlar fibers or PBO fibers and a resin matrix.

[0039] Further, the resin matrix includes one or a combination of more than one of polyurethane, epoxy resin, etc., but is not limited thereto.

[0040] In some specific embodiments, the impact-resistant layer is one or more of a layer of ultra-high molecular weight polyethylene fibers, a layer of Kevlar fibers or a layer of PBO fibers, and adopts a unidirectional (UD) cloth structure with an areal density of 50-300 g / m 2 .

[0041] In some specific embodiments, the depression-reducing layer is one or more of ultra-high molecular weight polyethylene fiber layer, Kevalr fiber layer, or PBO fiber layer, employing a unidirectional (UD) fabric structure with an areal density of 50–300 g / m². 2 .

[0042] Furthermore, the impact-resistant layer and the dent-reducing layer are made of 2 to 6 layers (such as 2, 4 and 6 layers) of unidirectional fabric orthogonally laid.

[0043] In some specific implementations, the thickness of the energy-absorbing layer is 0.6 to 2.5 mm.

[0044] In some specific implementations, the thickness of the impact-resistant layer is 1 to 5 mm.

[0045] In some specific implementations, the thickness of the depression reduction layer is 0.4 to 1 mm.

[0046] In some specific implementations, the impact-resistant layer, energy-absorbing layer, and depression-reducing layer can all be provided in multiple layers.

[0047] In some specific implementations, the mass ratio of the impact-resistant layer, the energy-absorbing layer, and the depression-reducing layer is (3-6):2:(2-5).

[0048] like Figure 1 As shown, the carbon nanotube composite material with excellent impact resistance provided in this embodiment of the invention includes the following structure:

[0049] The intermediate energy-absorbing layer structure includes a carbon nanotube composite film. A continuous, large-area carbon nanotube film is prepared using a floating catalytic method. Impurities inside the carbon nanotube film are removed and the orientation of the carbon nanotubes is improved through acid treatment and stretching processes. Thermoplastic resins such as polyvinyl alcohol are introduced as binders to weld the tube bundles in the carbon nanotube film, resulting in a carbon nanotube composite film. The carbon nanotube composite film is then orthogonally laid up at 0° / 90°.

[0050] Impact-resistant layer structure on the projectile-facing surface: Located at the front end of the energy-absorbing layer, it is made of one or more combinations of ultra-high molecular weight polyethylene UD cloth, PBO fiber UD cloth or Kevlar UD cloth, which has high strength characteristics and can effectively reduce the initial velocity of the projectile and resist local penetration.

[0051] Back surface depression reduction layer structure: Located at the rear end of the energy-absorbing layer, it is made of one or more combinations of ultra-high molecular weight polyethylene UD cloth, PBO fiber UD cloth or Kevlar UD cloth, which has high strength and high modulus characteristics, and can further reduce the projectile velocity and depression, thereby reducing damage to the human body.

[0052] Resin matrix: used for curing and bonding fibers, the material is any one or more complex combinations of polyurethane, phenolic resin, which can be adjusted according to the actual application and fiber selection.

[0053] The main inventive concept of the present application is that: drawing on the multilevel structure of pangolin in nature, using the light weight and high energy absorption characteristics of carbon nanotube film, and the high strength and high modulus characteristics of high performance fiber, a carbon nanotube composite material with excellent impact resistance is prepared by gradient density hybrid structure design of carbon nanotube film and traditional polymer material. This composite material can be applied to individual protection fields such as bulletproof vest and stab-resistant clothing. When a high-speed projectile or fragment penetrates the composite material, local damage occurs, compression damage and shear plugging occur on the bullet face, the fiber on the back of the bullet is mainly stretched and deformed to break and absorb energy, the resin inside is broken and the projectile and the composite material are rubbed to absorb energy, and delamination occurs between the layers. The high-strength fiber UD cloth with high interlaminar shear strength is used as the bullet face to withstand the shear damage of the fragment; the carbon nanotube film is used as the energy absorption layer to absorb the energy of the fragment in the form of tensile fracture and inter-tube sliding; the inner layer is made of high modulus fiber UD cloth to reduce the indentation of the bullet impact on the bulletproof material. The layers are sequentially laid and placed in a hot press for cold pressing treatment to further enhance the interfacial bonding strength.

[0054] In summary, through the synergistic effect of the multi-scale energy dissipation mechanism of the CNT film and the resin matrix, compared with the pure carbon nanotube film, the V50 value of the carbon nanotube composite material under ballistic impact is increased by more than 20%, the indentation value is reduced by more than 20%, and the material has good extreme environment adaptability, such as being able to withstand-70℃~120℃ high and low temperature, pH value of 5~9 acid and alkali corrosion, 3.5% NaCl salt spray, and underwater immersion for more than 20min.

[0055] As another aspect of the technical scheme of the present application, a preparation method of a carbon nanotube composite material includes: laying an impact-resistant layer, an energy-absorbing layer and a dent-reducing layer, and then cold pressing to obtain the carbon nanotube composite material.

[0056] In some embodiments, the cold pressing treatment has a temperature of 10~30℃, a time of 1~5min, and a pressure of 0.5~3MPa.

[0057] In some more specific embodiments, the preparation method specifically includes:

[0058] The carbon nanotube film is prepared by chemical vapor deposition method, and after treatment such as acid treatment and mechanical stretching, a dense and highly oriented carbon nanotube film is obtained, which is further compounded with thermoplastic resin to further improve the interfacial action;

[0059] The impact-resistant layer, the energy-absorbing layer and the depression-reducing layer are all orthotropic layers, and the carbon nanotube composite material is obtained through cold pressing treatment.

[0060] As another aspect of the technical solution of the present application, the carbon nanotube composite material can be applied to the field of individual protection, and by combining and hybridizing high-energy-absorbing carbon nanotube films and high-performance fiber materials, the problem of insufficient protection performance of single material and difficulty in meeting the requirements of extreme environmental adaptability can be solved.

[0061] Further, the application includes the application of the carbon nanotube composite material in individual protection equipment such as bulletproof clothes and stab-resistant clothes.

[0062] Further, the present application also provides an impact-resistant material comprising the aforementioned carbon nanotube composite material.

[0063] To sum up, the carbon nanotube composite material of the present application realizes the synergistic effect of multi-level energy dissipation paths, and the energy-absorbing efficiency is improved by more than 20%; through the orthogonal combination of multiple materials and structural optimization, the penetration resistance and depression reduction function are considered, and the overall stability of the composite material is improved; the carbon nanotube composite material has excellent environmental adaptability and can serve in extreme temperature, corrosion and humid heat environments for a long time; and the composite material has excellent flexibility, is suitable for wearable equipment, and improves the user's wearing comfort. The proposal and realization of the carbon nanotube composite material provide a feasible path for solving the new requirements of new battlefield environments and future equipment systems for impact-resistant materials, and have high popularization value and application prospect.

[0064] The technical solutions of the present application will be further described in detail below in combination with several preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. It should be noted that the following embodiments are intended to facilitate the understanding of the present application, and do not have any limiting effect. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. The experimental methods not specified in the following embodiments are usually carried out according to the conventional conditions or the conditions recommended by the manufacturers.

[0065] Embodiment 1

[0066] The structure and preparation process of the carbon nanotube composite material with excellent impact resistance of the present embodiment are as follows:

[0067] The carbon nanotube composite material is composed of an impact-resistant layer, an energy-absorbing layer and a depression-reducing layer in sequence;

[0068] Impact resistance layer: composed of UHMWPE UD cloth, UHMWPE fiber and polyurethane are impregnated and laid, composed of 4 layers of unidirectional cloth, with a grammage of 200g / m 2 ;

[0069] Energy absorption layer: continuous carbon nanotube film prepared by floating catalytic method, thickness of 15μm, after acid treatment and mechanical stretching, compounded with polyvinyl alcohol, 0° / 90° orthogonal layering;

[0070] Dimple reduction layer: composed of UHMWPE UD cloth, UHMWPE fiber and polyurethane are impregnated and laid, composed of 4 layers of unidirectional cloth, with a grammage of 200g / m 2 .

[0071] The mass ratio of the impact resistance layer, the energy absorption layer and the dimple reduction layer is 5:3:2, and the carbon nanotube film composite material is obtained by layering. The carbon nanotube composite material is obtained by cold pressing the carbon nanotube film composite material at a temperature of 30°C for 1min under a pressure of 1MPa.

[0072] The carbon nanotube composite material prepared in this example has excellent impact resistance and environmental adaptability. The results are shown in Tables 1 and 2. Under the same weight conditions, the impact resistance is better than that of pure carbon nanotube film structure and UHMWPE structure.

[0073] Example 2

[0074] This example is basically the same as Example 1, the main difference being that the impact resistance layer is composed of Kevlar UD cloth, Kevalr fiber and polyurethane are impregnated and laid, composed of 4 layers of unidirectional cloth, with a grammage of 200g / m 2 .

[0075] The carbon nanotube composite material prepared in this example has excellent impact resistance and environmental adaptability. The results are shown in Table 1.

[0076] Example 3

[0077] This example is basically the same as Example 1, the main difference being that the energy absorption layer is a continuous carbon nanotube film prepared by floating catalytic method, thickness of 5μm, after acid treatment and mechanical stretching, compounded with polyvinyl alcohol, 0° / 90° orthogonal layering.

[0078] The carbon nanotube composite material prepared in this example has excellent impact resistance and environmental adaptability.

[0079] Example 4

[0080] This example is substantially the same as example 1, the main difference is that the energy absorbing layer is a continuous carbon nanotube film prepared by the floating catalytic method, with a thickness of 15 μm, which is treated with acid and mechanically stretched, and is compounded with polyurethane, with 0° / 90° orthogonal laying.

[0081] The carbon nanotube composite material prepared in this example has excellent impact resistance and environmental adaptability.

[0082] Example 5

[0083] This example is substantially the same as example 1, the main difference is that the impact resistant layer is composed of UHMWPE UD cloth, the UHMWPE fibers are impregnated with polyurethane and laid, and is composed of 8 layers of unidirectional cloth, with a grammage of 340 g / m 2 .

[0084] The carbon nanotube composite material prepared in this example has excellent impact resistance and environmental adaptability.

[0085] Example 6

[0086] This example is substantially the same as example 1, the main difference is that the mass ratio of the impact resistant layer, the energy absorbing layer and the depression reducing layer is 4:3:3, and the carbon nanotube film composite material is obtained by hybrid laying.

[0087] The carbon nanotube composite material prepared in this example has excellent impact resistance and environmental adaptability, as shown in Table 1.

[0088] Example 7

[0089] This example is substantially the same as example 1, the main difference is that the carbon nanotube film composite material is subjected to cold pressing treatment, with a temperature of 30°C, a time of 2 min and a pressure of 3 MPa.

[0090] The carbon nanotube composite material prepared in this example has excellent impact resistance and environmental adaptability.

[0091] Example 8

[0092] This example is substantially the same as example 1, the main difference is that the impact resistant layer is composed of PBO UD cloth, the PBO fibers are impregnated with epoxy resin and laid, and is composed of 4 layers of unidirectional cloth, with a grammage of 200 g / m 2 .

[0093] Example 9

[0094] This example is substantially the same as example 1, the main difference is that the cold pressing treatment temperature is 10°C, and the time is 5 min.

[0095] Example 10

[0096] This example is substantially the same as Example 1, except that the cold pressing process is performed at a pressure of 0.5 MPa.

[0097] The carbon nanotube composite material prepared in this example has excellent impact resistance and environmental adaptability.

[0098] Table 1 Impact resistance test results of various carbon nanotube composite materials

[0099]

[0100]

[0101] Table 2 Environmental adaptability test results of the carbon nanotube composite material of Example 1

[0102]

[0103] Comparative Example 1

[0104] The commonly used high-energy absorbing material UHMWPE UD cloth has a V50 value of 611 m / s and a dent value of 24.3 mm against 1.1 g fragments under the same areal density.

[0105] Comparative Example 2

[0106] Compared with Example 1, the carbon nanotube film structure lacking the impact resistance layer and the dent reduction layer has a V50 value of 500 m / s and a dent value of 27.1 mm against 1.1 g fragments under the same areal density.

[0107] Comparative Example 3

[0108] Compared with Example 1, the structure lacking the impact resistance layer has a V50 value of 532 m / s and a dent value of 25.7 mm against 1.1 g fragments under the same areal density.

[0109] Comparative Example 4

[0110] Compared with Example 1, the structure lacking the dent reduction layer has a V50 value of 624 m / s and a dent value of 21.4 mm against 1.1 g fragments under the same areal density.

[0111] Based on the above examples and comparative examples, it can be clear that the embodiments provided by the present application propose to design and apply carbon nanotube film and high-performance fiber UD cloth in a gradient density structure to the individual protection field, which can solve the problems of defects, insufficient capacity and poor environmental adaptability of single materials, and through optimization of the combination mode and proportion, a material structure with excellent impact resistance can be designed, the ballistic direction and material energy absorption mode are changed, the material protection capacity is improved, the limitations of single materials are effectively avoided, and thus the bulletproof effect and energy absorption capacity are improved.

[0112] It should be pointed out that the technical solutions of the present application use UHMWPE, PBO fiber, Kevlar fiber and other high-strength fiber UD cloth as the shear-resistant layer, the middle layer can use carbon nanotube composite film as the energy-absorbing layer, the back ballistic surface uses UHMWPE, PBO fiber, Kevlar fiber and other fiber UD cloth as the anti-dimple layer, and the resin can be selected from epoxy, phenolic, polyurethane and the like. Equivalent deformation embodiments are within the feasible range of the present application and are not limited to the scope exemplified by the above examples.

[0113] It should be understood that the above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and it cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A carbon nanotube composite material, characterized by, The carbon nanotube composite material comprises: an energy-absorbing layer as an intermediate layer, and an impact-resistant layer and a dent-reducing layer arranged on both sides of the energy-absorbing layer, respectively; the energy-absorbing layer comprises a plurality of carbon nanotube films arranged in layers; and the impact-resistant layer and the dent-reducing layer each comprise at least one of an UHMWPE fiber layer, a Kevlar fiber layer, and a PBO fiber layer.

2. The carbon nanotube composite of claim 1, wherein: The energy-absorbing layer is formed by a plurality of carbon nanotube composite films, each of which is formed by compounding a carbon nanotube film with a thermoplastic resin as a binder; preferably, the number of layers of the carbon nanotube composite film is 50-300.

3. The carbon nanotube composite of claim 2, wherein: The carbon nanotube film is prepared by a chemical vapor deposition method and is obtained by acid treatment and mechanical drawing; and / or, the single-layer thickness of the carbon nanotube film is 5-20 μm; and / or, the thermoplastic resin comprises a combination of one or more of polyvinyl alcohol, polyurethane, and nylon 6; and / or, the carbon nanotube composite film is a 0° / 90° orthogonal layup.

4. The carbon nanotube composite of claim 1, wherein: The impact-resistant layer and the dent-reducing layer each comprise a combination of at least one of UHMWPE fiber, Kevlar fiber, or PBO fiber and a resin matrix; preferably, the resin matrix comprises a combination of one or both of polyurethane and epoxy resin; preferably, the impact-resistant layer is a front layer, and the dent-reducing layer is a back layer; And / or, the impact-resistant layer and the depression-reducing layer are both unidirectional cloth structures, and the area density is 50-400 g / m 2 preferably, the impact-resistant layer and the dent-reducing layer are formed by a 2-10 layer unidirectional cloth orthogonal layup.

5. The carbon nanotube composite of claim 1, wherein: The thickness of the energy-absorbing layer is 0.6-2.5 mm; and / or, the thickness of the impact-resistant layer is 1-5 mm; and / or, the thickness of the dent-reducing layer is 0.4-1 mm; and / or, the impact-resistant layer, the energy-absorbing layer, and the dent-reducing layer are each arranged in multiple layers; and / or, the mass ratio of the impact-resistant layer, the energy-absorbing layer, and the dent-reducing layer is (3-6):2:(2-5).

6. The carbon nanotube composite of claim 1, wherein: The carbon nanotube composite material has a V50 value under ballistic impact increased by more than 20%, a dent value decreased by more than 20%, and is resistant to -70°C-120°C high and low temperatures, pH 5-9 acid and alkali corrosion, 3.5% NaCl salt spray, and underwater immersion for more than 20 min.

7. The method of claim 1-6, wherein the carbon nanotube composite material is prepared by the steps of: The carbon nanotube composite material is prepared by: arranging the impact-resistant layer, the energy-absorbing layer, and the dent-reducing layer, and then performing cold pressing treatment.

8. The method of claim 7, wherein: The cold pressing treatment is performed at a temperature of 10-30°C for 1-5 min under a pressure of 0.5-3 MPa.

9. Use of the carbon nanotube composite material according to any one of claims 1 to 6 in the field of personal protection, preferably, the use comprises: The carbon nanotube composite material is applied in a bulletproof vest or a stab-resistant garment.

10. An impact resistant material characterized by, The carbon nanotube composite material comprises the carbon nanotube composite material according to any one of claims 1-6.

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