Carbon fiber resin composite bulletproof plate and preparation method thereof

Abstract

The invention relates to the technical field of carbon fiber resin composite plates, and particularly discloses a carbon fiber resin composite bulletproof plate and a preparation method thereof. According to the bulletproof plate, the mounting plates are arranged on the inner side of the first bulletproof plate and the inner side of the second bulletproof plate correspondingly, and the bulletproof plates comprise the first bulletproof plate, the second bulletproof plate and the mounting plates; piston cylinders are arranged at two ends of the rear surface of the first bulletproof plate; piston rods are arranged at two ends of the front surface of the second bulletproof plate; the first bulletproof plate and the second bulletproof plate are assembled through a piston rod and a piston head, and the bulletproof plate is obtained; the multiple pairs of bulletproof plates are assembled, disassembled and spliced through the locking devices, operation is easy and convenient, and time and labor are saved.

Description

Technical Field

[0001] The invention relates to the technical field of carbon fiber resin composite plates, in particular to a carbon fiber resin composite bulletproof plate and a preparation method thereof. Background Art

[0002] Bulletproof plate is a plate made of special materials for protection purposes; it is generally made by compounding reinforcing fibers and organic resins. In general processes, reinforcing fibers include aramid fibers, ultra-high density polyethylene fibers, carbon fibers, etc. Among them, aramid fibers or ultra-high density polyethylene fibers have disadvantages such as surface inertness, poor interlayer performance, poor aging resistance, and poor temperature resistance. In comparison, carbon fiber has the advantages of high elastic modulus, heat resistance, fatigue resistance, friction reduction, wear resistance, and corrosion resistance. Therefore, using carbon fiber as a reinforcing material and compounding it with an organic resin can achieve excellent performance. For example, existing studies have shown that the strength and elastic modulus of carbon fiber-epoxy resin composites exceed those of aluminum alloys, and are even close to high-strength steel.

[0003] In addition, the study found that carbon fiber also has a certain wave absorption, but its wave absorption performance is poor, and it needs to be mixed with absorbing materials. However, there are compatibility issues when high-content carbon fiber is mixed with organic resin, which makes the relevant performance unable to be maximized. In addition, the wave-absorbing material obtained by simply mixing the two can no longer meet people's requirements for bulletproof plates; it is necessary to further introduce synergistic materials to effectively attenuate the impact energy of the projectile so that the material can achieve the optimal ballistic performance.

[0004] On the other hand, the existing carbon fiber resin composite bulletproof plates are very inconvenient to splice, the operation is cumbersome, time-consuming and labor-intensive, and the work efficiency is greatly reduced.

[0005] In summary, it is of great significance to solve the above problems and prepare a carbon fiber resin composite bulletproof plate. Summary of the invention

[0006] The object of the present invention is to provide a carbon fiber resin composite material bulletproof plate and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: A carbon fiber resin composite bulletproof plate, the bulletproof plate comprising a first bulletproof plate and a second bulletproof plate which are parallel to each other; a plurality of piston cylinders are fixedly provided on the inner side of the first bulletproof plate close to the second bulletproof plate, a plurality of piston rods are fixedly provided on the inner side of the second bulletproof plate close to the first bulletproof plate, the ends of the piston rods are fixedly connected to piston heads, and the piston heads are slidably connected to the inner wall of the piston rods; The inner sides of the first bulletproof plate and the second bulletproof plate are both provided with mounting plates, and the mounting plates are provided with locking devices for loading, unloading and splicing multiple pairs of bulletproof plates.

[0008] More optimally, the locking device includes a pin, a fixing plate, a spring and a pull plate; the pin is slidably matched with a through hole opened on the mounting plate; the fixing plate is fixedly connected to the pin; the spring is sleeved on the pin, and the two ends of the spring are respectively connected to the mounting plate and the fixing plate; the pull plate is fixedly connected to one end of the pin.

[0009] More optimally, a slot is provided at one end of the first bulletproof plate and the second bulletproof plate close to the mounting plate, and an insert block matching the slot is provided at the other end of the first bulletproof plate and the second bulletproof plate, and a pin groove matching the pin is provided on the insert block.

[0010] In the scheme, when the pull plate is pulled, the pull plate drives the pin to move, the pin drives the fixed plate to move, the fixed plate compresses the spring, and then the plug blocks of another pair of the first bulletproof plate and the second bulletproof plate are inserted into the slots; when the pull plate is released, the spring drives the pin and the fixed plate to reset, the pin is inserted into the pin slot, and multiple pairs of bulletproof plates can be loaded, unloaded and spliced ​​by adjusting the locking device; in the scheme, the piston cylinder, the piston rod and the piston head cooperate to increase the buffering force between the first bulletproof plate and the second bulletproof plate, thereby achieving a certain shock absorption effect.

[0011] Preferably, the first bulletproof plate and the second bulletproof plate are made of the same material, which is a carbon fiber resin composite material; and the preparation method thereof comprises the following steps: Step 1: uniformly mix the modified carbon fiber, epoxy resin, methyltetrahydrophthalic anhydride and N,N-dimethylformamide, and perform ultrasonic defoaming to obtain an energy-absorbing matrix resin; impregnate the carbon fiber cloth in the energy-absorbing matrix resin, and semi-cure it to obtain an intermediate layer; Step 2: uniformly mix the chopped carbon fiber, silicon carbide, polycarbonate and N,N-dimethylformamide, remove bubbles by ultrasonication, add them into a mold, and hot-press the sheets at a temperature of 170-180°C, a pressure of 0.5-1MPa, and a time of 1-1.5 hours to obtain an outer layer; Step 3: stack 3 to 4 middle layers between the two outer layers of 5 to 10 layers, hot press at 180 to 190° C. for 12 to 18 minutes, and cool to obtain a carbon fiber resin composite material.

[0012] More optimally, the raw materials of the energy-absorbing matrix resin include the following components: 15 to 22 parts of modified carbon fiber, 60 to 75 parts of epoxy resin, 20 to 22 parts of methyltetrahydrophthalic anhydride, and 60 to 70 parts of N,N-dimethylformamide in parts by mass; the raw materials of the outer layer include the following components: 10 to 15 parts of chopped carbon fiber, 5 to 7 parts of silicon carbide, 60 to 70 parts of polycarbonate, and 55 to 65 parts of N,N-dimethylformamide in parts by mass.

[0013] The optimized preparation method of modified carbon fiber is as follows: zinc acetate and lanthanum acetate are added to a mixed solution of N,N-dimethylformamide and ethanol to obtain a mixed solution A; polypyrrole and iron triacetylacetonate are added to a mixed solution of N,N-dimethylformamide and ethanol, and ultrasonicated for 2 to 3 hours at a power of 90 to 100 W to obtain a mixed solution B; the mixed solution A, the mixed solution B, and polyvinyl pyrrolidone (PVP) are uniformly mixed, heated at 90 to 100° C. for 5 to 7 hours, centrifuged, washed, and dried to obtain an absorbing material; Adding polyacrylonitrile to N,N-dimethylformamide, uniformly mixing for 12 to 20 hours to obtain a polyacrylonitrile solution; ultrasonically dispersing the absorbing material in N,N-dimethylformamide, adding the polyacrylonitrile solution, uniformly mixing for 2 to 4 hours, then adding the polyacrylonitrile solution, and continuing to mix for 1 to 3 hours to obtain an electrospinning solution; The electrospinning solution is subjected to electrospinning treatment at a flow rate of 0.6 mL / h to 0.7 mL / h, and then dried at 55 to 60° C. to obtain fibers; the fibers are carbonized to obtain modified carbon fibers.

[0014] More optimally, the raw materials of the absorbing material include the following components: by mass, 0.1-0.2 parts of zinc acetate, 0.2-0.25 parts of lanthanum acetate, 0.6-1.2 parts of polypyrrole, 0.12-0.15 parts of ferric triacetylacetonate, 0.4-0.45 parts of polyvinylpyrrolidone (PVP), 7-10 parts of N,N-dimethylformamide, and 3-5 parts of ethanol; the raw materials of the electrospinning solution include the following components: by mass, 0.4-0.6 parts of absorbing material, 1-2.2 parts of polyacrylonitrile, and 10-15 parts of N,N-dimethylformamide.

[0015] The more optimized conditions for the electrospinning treatment are: voltage of 16~18kV, ambient temperature of 23℃~25℃, and relative humidity of 32%~35%; the specific steps of the carbonization treatment are: in air, heating the fiber at 250℃~260℃ for 2~3 hours, and then in an argon atmosphere, heating to 700℃~750℃ at a rate of 2℃ / min~3℃ / min and heating for 1.5~2 hours.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are: Carbon fiber itself has a low reflection effect on electromagnetic waves. The present invention intrinsically modifies it, thereby effectively improving its wave absorbing performance. In the scheme, zinc acetate and lanthanum acetate are made into mixed solution A, polypyrrole and iron triacetylacetonate are made into mixed solution B, and then the two mixed solutions are mixed. During the process of polypyrrole combining with zinc ions in the solution, lanthanum and iron are wrapped or compounded to make MOF absorbing materials. In order to improve the stability of the absorbing materials, polyvinyl pyrrolidone (PVP) is added during the preparation process, which helps to control the formation of fibers. The absorbing materials are then compounded with polyacrylonitrile and made into fibers by electrospinning, and then the fibers are carbonized to obtain modified carbon fibers. This method can significantly improve the roughness of the carbon fiber surface, form a strong mechanical interlocking effect with the epoxy resin matrix, and effectively improve the interface bonding strength and absorbing performance between the two.

[0017] In the present invention, modified carbon fiber, epoxy resin, methyltetrahydrophthalic anhydride and N,N-dimethylformamide are prepared into an energy-absorbing matrix resin; carbon fiber cloth is impregnated in the energy-absorbing matrix resin, baked, and semi-cured to obtain an intermediate layer; the carbon fiber cloth can increase the strength and stability of the intermediate layer, so that the intermediate layer not only has wave absorption, but also can effectively improve the rigidity and high temperature resistance of the intermediate layer.

[0018] Among them, polypyrrole is a conductive polymer with a typical rigid conjugated large π bond structure, and has the advantages of strong conductivity adaptability, easy synthesis, and light weight; polypyrrole has wave absorption performance based on the interaction between its conductivity and electromagnetic waves; the present invention combines polypyrrole with zinc ions to form MOF materials, which can effectively combine the conductivity of polypyrrole with the porosity and high specific surface area of ​​the MOF structure, thereby enhancing its absorption and attenuation capabilities for electromagnetic waves. In the scheme, by adjusting the lanthanum and iron loadings and improving the dielectric properties, its absorption performance for electromagnetic waves can be optimized, which is beneficial to improving the wave absorption performance of carbon fiber resin composite materials.

[0019] In the scheme, short-cut carbon fiber, silicon carbide and polycarbonate are made into a rigid elastic layer; among them, polycarbonate (PC) is a polymer material with good impact strength and heat resistance; in the rigid elastic layer, the rigidity of the material can be effectively improved, and the overall rigidity and impact resistance of the elastic layer can be increased.

[0020] Chopped carbon fiber is a high-performance reinforcing material with extremely high strength and modulus, which can significantly improve the mechanical properties of the material. In the rigid elastic layer, its role is to provide structural strength, ensure that the elastic layer can withstand external impact and pressure, and maintain the integrity and stability of the structure.

[0021] Silicon carbide is a material with high hardness and high wear resistance. It not only has good wave absorption, but also has excellent chemical stability and thermal stability. In the rigid bullet-bearing layer, the role of silicon carbide is to enhance wear resistance and prevent the bullet-bearing layer from being worn or damaged when impacted, thereby protecting the internal structure from damage. In order to improve its strength, the scheme stacks two outer layers of 5 to 10 layers with 3 to 4 intermediate layers, and then hot presses and cools them in sequence to obtain a carbon fiber resin composite material.

[0022] In the present invention, the carbon fiber resin composite material obtained above is cut into a desired shape to obtain two bulletproof plates; the two bulletproof plates are matched through a piston cylinder, a piston rod and a piston head, so that the buffering force between the first bulletproof plate and the second bulletproof plate can be increased, thereby achieving a certain shock absorption effect. In addition, multiple pairs of bulletproof plates can be loaded, unloaded and spliced ​​by adjusting the locking device, which is easy to operate and saves time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the side cross-sectional structure of a carbon fiber resin composite material bulletproof plate proposed by the present invention; Figure 2 This is a schematic diagram of the enlarged structure of point A of a carbon fiber resin composite material bulletproof plate proposed by the present invention; Figure 3 A schematic side view of the structure of a carbon fiber resin composite material bulletproof plate proposed by the present invention; In the figure: 1 first bulletproof plate, 2 second bulletproof plate, 3 piston cylinder, 4 piston rod, 5 piston head, 6 mounting plate, 7 locking device, 8 slot, 9 insert block, 71 pin, 72 fixing plate, 73 spring, 74 pull plate, 91 pin slot. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The preparation method of the modified carbon fiber is as follows: 0.2 parts of zinc acetate and 0.22 parts of lanthanum acetate are added to a mixed solution of 4 parts of N,N-dimethylformamide and 2 parts of ethanol to obtain a mixed solution A for standby use; 0.8 parts of polypyrrole and 0.13 parts of ferric triacetylacetonate are added to a mixed solution of 5 parts of N,N-dimethylformamide and 3 parts of ethanol, and ultrasonicated for 2.5 hours at a power of 100 W to obtain a mixed solution B for standby use; the mixed solution A, the mixed solution B and 0.45 parts of PVP are uniformly mixed, heated at 90° C. for 6 hours, centrifuged, washed and dried to obtain an absorbing material; 2 parts of polyacrylonitrile were added to 5 parts of N,N-dimethylformamide, and the mixture was uniformly mixed for 18 hours to obtain a polyacrylonitrile solution; 0.6 parts of the absorbing material were ultrasonically dispersed in 7 parts of N,N-dimethylformamide, 3 parts of the polyacrylonitrile solution were added, and the mixture was uniformly mixed for 2 hours, and the remaining polyacrylonitrile solution was added, and the mixture was continued to mix for 2 hours to obtain an electrospinning solution; The electrospinning solution was electrospun at a flow rate of 0.65 mL / h (voltage of 17 kV, ambient temperature of 25°C, relative humidity of 35%), and then dried at 60°C to obtain fibers; the fibers were heated at 260°C in air for 3 hours, and then heated to 740°C at a rate of 2.5°C / min in an argon atmosphere for 2 hours to obtain modified carbon fibers.

[0026] Embodiments 1 to 3: Cut the carbon fiber resin composite material into the required shape to obtain the first bulletproof plate 1 and the second bulletproof plate 2; and refer to Figures 1 to 3 Assemble; The bulletproof plate includes a first bulletproof plate 1 and a second bulletproof plate 2; the first bulletproof plate 1 and the second bulletproof plate 2 are parallel and opposite to each other; a plurality of piston cylinders 3 are fixedly provided on the inner side of the first bulletproof plate 1 close to the second bulletproof plate 2, a plurality of piston rods 4 are fixedly provided on the inner side of the second bulletproof plate 2 close to the first bulletproof plate 1, the ends of the piston rods 4 are fixedly connected to the piston heads 5, and the piston heads 5 are slidably connected to the inner wall of the piston rods 4; The first bulletproof plate 1 and the second bulletproof plate 2 are both provided with a mounting plate 6 on their inner sides; a slot 8 is provided at one end of the first bulletproof plate 1 and the second bulletproof plate 2 close to the mounting plate 6, and an insert block 9 matching the slot 8 is provided at the other end of the first bulletproof plate 1 and the second bulletproof plate 2, and a pin groove 91 matching the pin 71 is provided on the insert block 9; A locking device 7 is provided on the mounting plate 6 for loading, unloading and splicing multiple pairs of bulletproof plates; The locking device 7 includes a pin 71, a fixing plate 72, a spring 73, and a pull plate 74; the pin 71 is slidably matched with a through hole provided on the mounting plate 6; the fixing plate 72 is fixedly connected to the pin 71; the spring 73 is sleeved on the pin 71, and the two ends of the spring 73 are respectively connected to the mounting plate 6 and the fixing plate 72, and the pull plate 74 is fixedly connected to one end of the pin 71; In the implementation process of the bulletproof plate, when the pulling plate 74 on the bulletproof plate is pulled, the pulling plate 74 drives the pin 71 to move, the pin 71 drives the fixing plate 72 to move, the fixing plate 72 compresses the spring 73, and the plug block 9 of another pair of the first bulletproof plate 1 and the second bulletproof plate 2 is inserted into the slot 8; the pulling plate 74 is released, the spring 73 drives the pin 71 and the fixing plate 72 to reset, and the pin 71 is inserted into the pin groove 91. By adjusting the locking device 7, multiple pairs of bulletproof plates can be loaded, unloaded and spliced, which is easy to operate and saves time and effort; the piston cylinder 3, the piston rod 4 and the piston head 5 cooperate to increase the buffering force between the first bulletproof plate 1 and the second bulletproof plate 2, thereby achieving a certain shock absorption effect.

[0027] Example 1: The preparation method of carbon fiber resin composite material is: Step 1: 17 parts of modified carbon fiber, 70 parts of epoxy resin, 20 parts of methyltetrahydrophthalic anhydride, and 75 parts of N,N-dimethylformamide are uniformly mixed, and ultrasonic defoaming is performed to obtain an energy-absorbing matrix resin; the carbon fiber cloth is impregnated in the energy-absorbing matrix resin, the pressure is set to 1 bar, and hot pressing is performed at 115°C for 8 minutes for semi-curing to obtain an intermediate layer; Step 2: 12 parts of chopped carbon fiber, 5 parts of silicon carbide, 70 parts of polycarbonate and 65 parts of N,N-dimethylformamide are uniformly mixed, ultrasonically defoamed, added into a mold, the pressure is set to 0.5 MPa, and hot pressed at a temperature of 175°C for 1 hour to obtain an outer layer; Step 3: stack 4 middle layers between the two outer layers of 8 layers, apply liquid epoxy resin between the layers, hot press at 180°C for 15 minutes, and cool to obtain a carbon fiber resin composite material.

[0028] Example 2: The preparation method of the carbon fiber resin composite material is: Step 1: 15 parts of modified carbon fiber, 70 parts of epoxy resin, 20 parts of methyltetrahydrophthalic anhydride, and 75 parts of N,N-dimethylformamide are uniformly mixed, and ultrasonic defoaming is performed to obtain an energy-absorbing matrix resin; the carbon fiber cloth is impregnated in the energy-absorbing matrix resin, the pressure is set to 1 bar, and hot pressing is performed at 115°C for 8 minutes for semi-curing to obtain an intermediate layer; Step 2: 12 parts of chopped carbon fiber, 5 parts of silicon carbide, 70 parts of polycarbonate and 65 parts of N,N-dimethylformamide are uniformly mixed, ultrasonically defoamed, added into a mold, the pressure is set to 0.5 MPa, and hot pressed at a temperature of 175°C for 1 hour to obtain an outer layer; Step 3: stack 4 middle layers between the two outer layers of the 8 layers, apply liquid epoxy resin between the layers, hot press at 180°C for 15 minutes, and cool to obtain a carbon fiber resin composite material.

[0029] Example 3: The preparation method of the carbon fiber resin composite material is: Step 1: 22 parts of modified carbon fiber, 70 parts of epoxy resin, 20 parts of methyltetrahydrophthalic anhydride, and 75 parts of N,N-dimethylformamide are uniformly mixed, and ultrasonic defoaming is performed to obtain an energy-absorbing matrix resin; the carbon fiber cloth is impregnated in the energy-absorbing matrix resin, the pressure is set to 1 bar, and hot pressing is performed at 115°C for 8 minutes for semi-curing to obtain an intermediate layer; Step 2: 12 parts of chopped carbon fiber, 5 parts of silicon carbide, 70 parts of polycarbonate and 65 parts of N,N-dimethylformamide are uniformly mixed, ultrasonically defoamed, added into a mold, the pressure is set to 0.5 MPa, and hot pressed at a temperature of 175°C for 1 hour to obtain an outer layer; Step 3: stack 4 middle layers between the two outer layers of the 8 layers, apply liquid epoxy resin between the layers, hot press at 180°C for 15 minutes, and cool to obtain a carbon fiber resin composite material.

[0030] Comparative Example 1 is based on Example 1, except that lanthanum and iron are not introduced into the modified carbon fiber; the preparation method of the carbon fiber resin composite material is as follows: Step 1: 17 parts of modified carbon fiber, 70 parts of epoxy resin, 20 parts of methyltetrahydrophthalic anhydride, and 75 parts of N,N-dimethylformamide are uniformly mixed, and ultrasonic defoaming is performed to obtain an energy-absorbing matrix resin; the carbon fiber cloth is impregnated in the energy-absorbing matrix resin, the pressure is set to 1 bar, and hot pressing is performed at 115°C for 8 minutes for semi-curing to obtain an intermediate layer; Step 2: 12 parts of chopped carbon fiber, 5 parts of silicon carbide, 70 parts of polycarbonate and 65 parts of N,N-dimethylformamide are uniformly mixed, ultrasonically defoamed, added into a mold, the pressure is set to 0.5 MPa, and hot pressed at a temperature of 175°C for 1 hour to obtain an outer layer; Step 3: stack 4 middle layers between the two outer layers of the 8 layers, apply liquid epoxy resin between the layers, hot press at 180°C for 15 minutes, and cool to obtain a carbon fiber resin composite material.

[0031] Comparative Example 2 is based on Example 1, but silicon carbide is not introduced into the outer layer; the preparation method of the carbon fiber resin composite material is: Step 1: 17 parts of modified carbon fiber, 70 parts of epoxy resin, 20 parts of methyltetrahydrophthalic anhydride, and 75 parts of N,N-dimethylformamide are uniformly mixed, and ultrasonic defoaming is performed to obtain an energy-absorbing matrix resin; the carbon fiber cloth is impregnated in the energy-absorbing matrix resin, the pressure is set to 1 bar, and hot pressing is performed at 115°C for 8 minutes for semi-curing to obtain an intermediate layer; Step 2: 12 parts of chopped carbon fiber, 70 parts of polycarbonate and 65 parts of N,N-dimethylformamide are uniformly mixed, ultrasonically defoamed, added into a mold, the pressure is set to 0.5 MPa, and hot-pressed at a temperature of 175°C for 1 hour to obtain an outer layer; Step 3: stack 4 middle layers between the two outer layers of the 8 layers, apply liquid epoxy resin between the layers, hot press at 180°C for 15 minutes, and cool to obtain a carbon fiber resin composite material.

[0032] Performance testing: Shooting experiment: The carbon fiber resin composite materials of Examples 1 to 3 and Comparative Examples 1 to 2 were tested, the bullet speed (1953-style 7.62mm ordinary bullet) was 820m / s, the shooting angle was 0°, the shooting distance was 100m, the temperature of the test environment was 22°C, and the humidity was 55%RH, as shown in Table 1; Wave absorbing performance testing: The bow method was used to examine the wave absorbing performance of Examples 1 to 3 and Comparative Examples 1 to 2, as shown in Table 1.

[0033] Table 1

[0034] Conclusion: From Table 1, it is found that the carbon fiber resin composite material is not penetrated; however, Comparative Example 1 is based on Example 1, and lanthanum and iron are not introduced into the modified carbon fiber, resulting in a decrease in the wave absorption performance, because lanthanum and iron improve the dielectric properties and can optimize its absorption performance of electromagnetic waves. Comparative Example 2 is based on Example 1, and silicon carbide is not introduced into the outer layer, resulting in a decrease in the wave absorption performance, because silicon carbide not only has a certain wave absorption property, but also can improve the rigidity of the carbon fiber resin composite material.

[0035] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A carbon fiber resin composite bulletproof plate, characterized in that: The bulletproof plate comprises a first bulletproof plate (1) and a second bulletproof plate (2) which are parallel to each other; a plurality of piston cylinders (3) are fixedly provided on the inner side of the first bulletproof plate (1) close to the second bulletproof plate (2); a plurality of piston rods (4) are fixedly provided on the inner side of the second bulletproof plate (2) close to the first bulletproof plate (1); the ends of the piston rods (4) are fixedly connected to piston heads (5); and the piston heads (5) are slidably connected to the inner wall of the piston rods (4); A mounting plate (6) is provided on the inner side of each of the first bulletproof plate (1) and the second bulletproof plate (2). A locking device (7) is provided on the mounting plate (6) for loading, unloading and splicing a plurality of bulletproof plates.

2. The carbon fiber resin composite material bulletproof plate according to claim 1, characterized in that: The locking device (7) comprises a pin (71), a fixing plate (72), a spring (73) and a pull plate (74); the pin (71) is slidably matched with a through hole provided on the mounting plate (6); the fixing plate (72) is fixedly connected to the pin (71); the spring (73) is sleeved on the pin (71), and two ends of the spring (73) are respectively connected to the mounting plate (6) and the fixing plate (72); the pull plate (74) is fixedly connected to one end of the pin (71).

3. The carbon fiber resin composite material bulletproof plate according to claim 1, characterized in that: A slot (8) is provided at one end of the first bulletproof plate (1) and the second bulletproof plate (2) close to the mounting plate (6), and an insert block (9) matching the slot (8) is provided at the other end of the first bulletproof plate (1) and the second bulletproof plate (2), and a pin groove (91) matching the pin (71) is provided on the insert block (9).

4. A method for preparing a carbon fiber resin composite bulletproof plate, characterized in that: The first bulletproof plate (1) and the second bulletproof plate (2) described in claim 1 are made of the same material, which is a carbon fiber resin composite material; and the preparation method thereof comprises the following steps: Step 1: uniformly mix the modified carbon fiber, epoxy resin, methyltetrahydrophthalic anhydride and N,N-dimethylformamide, and perform ultrasonic defoaming to obtain an energy-absorbing matrix resin; impregnate the carbon fiber cloth in the energy-absorbing matrix resin, and semi-cure it to obtain an intermediate layer; Step 2: uniformly mix the chopped carbon fiber, silicon carbide, polycarbonate and N,N-dimethylformamide, remove bubbles by ultrasonication, add them into a mold, and hot-press the sheets at a temperature of 170-180°C, a pressure of 0.5-1MPa, and a time of 1-1.5 hours to obtain an outer layer; Step 3: stack 3 to 4 middle layers between the two outer layers of 5 to 10 layers, hot press at 180 to 190° C. for 12 to 18 minutes, and cool to obtain a carbon fiber resin composite material.

5. The method for preparing a carbon fiber resin composite material bulletproof plate according to claim 4, characterized in that: The raw materials of the energy-absorbing matrix resin include the following components: 15 to 22 parts of modified carbon fiber, 60 to 75 parts of epoxy resin, 20 to 22 parts of methyltetrahydrophthalic anhydride, and 60 to 70 parts of N,N-dimethylformamide in parts by mass; the raw materials of the outer layer include the following components: 10 to 15 parts of chopped carbon fiber, 5 to 7 parts of silicon carbide, 60 to 70 parts of polycarbonate, and 55 to 65 parts of N,N-dimethylformamide in parts by mass.

6. The method for preparing a carbon fiber resin composite material bulletproof plate according to claim 4, characterized in that: The preparation method of the modified carbon fiber is as follows: zinc acetate and lanthanum acetate are added to a mixed solution of N,N-dimethylformamide and ethanol to obtain a mixed solution A; polypyrrole and iron triacetylacetonate are added to the mixed solution of N,N-dimethylformamide and ethanol, and ultrasonicated for 2 to 3 hours at a power of 90 to 100 W to obtain a mixed solution B; the mixed solution A, the mixed solution B and polyvinyl pyrrolidone are uniformly mixed, heated at 90 to 100° C. for 5 to 7 hours, centrifuged, washed and dried to obtain an absorbing material; Adding polyacrylonitrile to N,N-dimethylformamide, uniformly mixing for 12 to 20 hours to obtain a polyacrylonitrile solution; ultrasonically dispersing the absorbing material in N,N-dimethylformamide, adding the polyacrylonitrile solution, uniformly mixing for 2 to 4 hours, then adding the polyacrylonitrile solution, and continuing to mix for 1 to 3 hours to obtain an electrospinning solution; The electrospinning solution is subjected to electrospinning treatment at a flow rate of 0.6 mL / h to 0.7 mL / h, and then dried at 55 to 60° C. to obtain fibers; the fibers are carbonized to obtain modified carbon fibers.

7. The method for preparing a carbon fiber resin composite material bulletproof plate according to claim 6, characterized in that: The raw materials of the absorbing material include the following components: by weight, 0.1-0.2 parts of zinc acetate, 0.2-0.25 parts of lanthanum acetate, 0.6-1.2 parts of polypyrrole, 0.12-0.15 parts of ferric triacetylacetonate, 0.4-0.45 parts of polyvinylpyrrolidone, 7-10 parts of N,N-dimethylformamide, and 3-5 parts of ethanol; the raw materials of the electrostatic spinning solution include the following components: by weight, 0.4-0.6 parts of absorbing material, 1-2.2 parts of polyacrylonitrile, and 10-15 parts of N,N-dimethylformamide.

8. The method for preparing a carbon fiber resin composite material bulletproof plate according to claim 6, characterized in that: The conditions of the electrospinning treatment are: voltage of 16-18 kV, ambient temperature of 23°C-25°C, and relative humidity of 32%-35%; the specific steps of the carbonization treatment are: heating the fiber at 250°C-260°C for 2-3 hours in air, and then heating to 700°C-750°C at a rate of 2°C / min-3°C / min in an argon atmosphere for 1.5-2 hours.

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