PBO fiber reinforced bulletproof helmet and preparation method thereof

Abstract

The invention discloses a PBO fiber reinforced bulletproof helmet and a preparation method thereof. The PBO fiber reinforced bulletproof helmet is provided with a shell, the shell comprises a resin matrix and reinforcing material layers, the reinforcing material layers are distributed in the resin matrix, and the adjacent reinforcing material layers are fixedly combined through the resin matrix; the reinforcing material layer comprises PBO fibers. According to the bulletproof helmet, the PBO fiber is adopted as a reinforcement body to prepare the bulletproof helmet for the first time, and the problems that an existing aramid fiber helmet is poor in bulletproof performance and an ultra-high molecular weight polyethylene helmet is poor in stability are solved; according to the preparation method provided by the invention, the hot pressing process is optimized, so that the problem of deviation caused by smooth surface of the PBO fiber and poor bonding property with the resin is avoided, and the PBO fiber reinforced bulletproof helmet with stable shape and excellent performance is prepared.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material science, and particularly relates to a PBO fiber reinforced bulletproof helmet and a preparation method thereof. BACKGROUND

[0002] High-speed projectiles or fragments in the battlefield environment can cause 80% of fatal injuries, of which 45% are located in the head. Wearing a bulletproof helmet can reduce the mortality rate by about 20%. When a high-speed high-energy bullet impacts a bulletproof helmet, the helmet deforms without penetration, and the back of the helmet contacts the head or the shock wave is transmitted to the head, causing serious damage to the brain. In recent years, although the application of bulletproof helmets has reduced the incidence and mortality of cranial penetration, the problem of head injury caused by the impact energy of high-speed bullets and explosive fragments has become increasingly prominent. The resulting cranial injury leads to decreased combat capability, memory loss, slow execution and reaction speed, sensory motor dysfunction, and even death. With the continuous improvement of the mechanical properties of high-strength and high-modulus fibers such as aramid and ultra-high molecular weight polyethylene fibers, non-metal bulletproof helmets are becoming lighter and thinner, and the bulletproof performance of the helmet is continuously improved. However, the increasing bulletproof capability and protection requirements cause the helmet to produce head injury while successfully blocking the high-speed bullet penetration, resulting in a large number of casualties. Rafaels et al. found that in 2001-2012, more than 6000 cases of gunshot / breakage injury were analyzed in the process of war, anti-terrorism and peacekeeping in the US army, and more than 70% of the injured were wearing bulletproof equipment at the time of injury, of which head injury accounted for 50% of the total. Therefore, understanding the injury mechanism of blunt injury after protective armor and strengthening the protection of head injury is an important scientific and engineering problem that needs to be solved urgently. In recent years, foreign countries have gradually carried out research on head injury caused by bullets / explosive fragments. In 1998, NATO launched a test and evaluation research project on non-penetrating injury equipment participated by the United Kingdom, Canada, the Netherlands and other countries. At present, the US army's research on helmets focuses more on weight reduction, protection performance improvement and the establishment of an overall comprehensive platform. The US Natick Research Center and the research institute affiliated to the Canadian Department of Defense jointly carried out simulation analysis of the head stress state caused by the non-penetrating ballistic impact of the helmet and research on the objective test evaluation system, with the goal of developing a helmet protection performance standard under non-penetrating conditions. Subsequently, the University of Virginia also joined in the research under the sponsorship of the US Natick Research Center, forming a joint research team mainly composed of researchers from the US and Canada to carry out preliminary research.

[0003] CN107289813A patent proposes a bulletproof helmet and a preparation method thereof, the helmet shell is mainly formed by pressing a plurality of layers of ultra-high molecular weight polyethylene fiber or film non-woven cloth circular sheet, this method of cutting non-woven cloth directly into a circular sheet not only simplifies the complicated operation of cutting continuous non-woven cloth into petal-shaped or fan-shaped in the preparation of traditional bulletproof helmet, but also effectively ensures the integrity and continuity of non-woven cloth. CN105924957A proposes a bulletproof helmet and a preparation method thereof, the helmet includes a high molecular material and a fiber reinforced body, which adopts an injection molding process, uses a thermoplastic resin and a fiber reinforced body composite, and then is formed by hot pressing, injection, cooling and separation. CN107560501A proposes an aramid bulletproof helmet, the inner layer is composed of a plurality of layers of high-gel-content fiber fabric pre-impregnated material, and the outer layer is composed of a plurality of layers of low-content fiber fabric pre-impregnated material, and the inner and outer layers are connected by a perforated metal layer.

[0004] The existing bulletproof helmet is classified according to the raw materials, there are aramid helmet and ultra-high molecular weight polyethylene helmet, although the aramid helmet has high impact resistance, but also has high water absorption and moisture absorption, the helmet exposed to water or humid conditions will increase the weight. In addition, the compressive strength of aramid fiber is lower than that of glass fiber and carbon fiber, the composite material of aramid fabric has very high production requirements and is difficult to process. The ultra-high molecular weight polyethylene helmet has large thickness, poor high temperature resistance, poor stability, large dynamic depression, and large non-penetration damage of bullet to human body. SUMMARY

[0005] In view of the deficiencies of the prior art, the purpose of the present application is to provide a PBO fiber reinforced bulletproof helmet and a preparation method thereof.

[0006] To achieve the above-mentioned purpose of the application, the technical scheme adopted by the present application comprises:

[0007] In a first aspect, the present application provides a PBO fiber reinforced bulletproof helmet, the PBO fiber reinforced bulletproof helmet has a shell, the shell includes a resin matrix and a reinforcing material layer, the reinforcing material layer is distributed in the resin matrix, and adjacent reinforcing material layers are fixedly combined by the resin matrix; the reinforcing material layer comprises PBO fiber.

[0008] In a second aspect, the present application further provides a preparation method of the above-mentioned PBO fiber reinforced bulletproof helmet, which comprises:

[0009] Providing a prepreg, the prepreg includes a plurality of reinforcing material layers formed by at least PBO fiber and a resin attached in the reinforcing material layer;

[0010] Hot-press the prepreg with a mold to cure the resin and shape the prepreg, and obtain the PBO fiber reinforced bulletproof helmet.

[0011] Compared with the prior art, the beneficial effects of the present application at least include:

[0012] The present application first proposes to use PBO fiber as a reinforcing body to prepare a bulletproof helmet, solving the problems of poor bulletproof performance of existing aramid helmets and poor stability of ultra-high molecular weight polyethylene helmets.

[0013] The preparation method provided by the present application avoids the deviation problem caused by the poor combination of the smooth PBO fiber surface and the resin by optimizing the hot-pressing process, and a PBO fiber reinforced bulletproof helmet with stable shape and excellent performance is prepared.

[0014] The above description is only a summary of the technical solutions of the present application, in order to enable those skilled in the art to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, as follows. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a perspective view structural schematic diagram of the PBO fiber reinforced bulletproof helmet provided by a typical embodiment of the present application;

[0016] Figure 2 is a test diagram of the relationship between the interfacial bonding strength of the PBO fiber reinforced bulletproof helmet and the carbon nanotube doping amount provided by some typical embodiments of the present application;

[0017] Figure 3 is a test diagram of the relationship between the interfacial bonding strength of the PBO fiber reinforced bulletproof helmet and the microwave plasma treatment time provided by some typical embodiments of the present application;

[0018] Figure 4 is a test diagram of the relationship between the interfacial bonding strength of the PBO fiber reinforced bulletproof helmet and the microwave plasma treatment power provided by some typical embodiments of the present application. DETAILED DESCRIPTION

[0019] In view of the deficiencies in the prior art, the present inventors have long-term research and a large amount of practice, and have proposed the technical solutions of the present application. The technical solutions, their implementation processes and principles will be further explained as follows.

[0020] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0021] Moreover, the terms such as "first" and "second" and the like are merely used to distinguish one from another of a same name, and do not necessarily require or imply any such actual relationship or order between the components or method steps.

[0022] As shown in the accompanying drawings, Figure 1 The PBO fiber reinforced bulletproof helmet provided by the embodiment of the present application has a shell, the shell comprises a resin matrix and a reinforcing material layer, the reinforcing material layer is distributed in the resin matrix, and adjacent reinforcing material layers are fixedly combined by the resin matrix; the reinforcing material layer comprises PBO fibers.

[0023] In some embodiments, the reinforcing material layer comprises two-dimensional plain fiber cloth and / or three-dimensional woven fiber cloth containing PBO fibers.

[0024] In some embodiments, the reinforcing material layer is composed of pure PBO fibers.

[0025] The present application mainly provides a bulletproof helmet containing PBO material, preferably using pure PBO fibers as the above-mentioned reinforcing material layer, but does not exclude that different fiber materials and resins can be used to prepare bulletproof helmets, such as aramid fibers, UHMWPE fibers, etc. combined with PBO fibers, and hybrid schemes of epoxy resin, phenolic resin, etc.

[0026] In some embodiments, the resin matrix comprises any one or a combination of two or more of epoxy resin, phenolic resin, bismaleimide resin, and polyimide resin.

[0027] As some typical application examples of the above technical solutions, the present application first provides a PBO bulletproof helmet, which comprises a shell composed of several layers of fiber cloth impregnated with PBO fibers, the fiber cloth can be two-dimensional plain cloth, three-dimensional woven cloth, etc., and the glue pre-impregnated in the fiber cloth can be epoxy resin, phenolic resin, bismaleimide resin, polyimide, etc.

[0028] In addition, in order to further enhance the bonding force, in some embodiments, the resin accounts for about 13%, specifically 10-20%.

[0029] In some embodiments, the resin matrix is also doped with carbon nanomaterial, and the mass fraction of the carbon nanomaterial in the resin matrix is about 1.5%, specifically for example 0.5-3%.

[0030] In some embodiments, the carbon nanomaterial comprises carbon nanotubes and / or graphene.

[0031] PBO fiber is praised as "super fiber in 21st century" due to its high strength, high modulus, high thermal stability and high flame resistance, and is widely used in individual protection, aerospace and automobile industry and many other engineering fields. However, the PBO fiber has a smooth surface and poor interface bonding performance with resin, and the key point is to find a suitable resin to combine with the PBO fiber so as to maximize the effect of the PBO fiber. The resin used in the present application can add a small amount of nano materials (carbon nanotubes, graphene, etc.) to improve the interfacial bonding force with the PBO fiber.

[0032] The second aspect of the embodiment of the present application also provides a preparation method of the PBO fiber reinforced bulletproof helmet, which comprises the following steps:

[0033] A prepreg is provided, which comprises a plurality of layers of reinforcing material formed at least by PBO fibers and a resin attached in the reinforcing material layers.

[0034] The prepreg is subjected to hot pressing treatment by using a mold so as to cure the resin and shape the prepreg, thereby obtaining a PBO fiber reinforced bulletproof helmet.

[0035] The present application provides a PBO fiber bulletproof helmet and a preparation method thereof. The PBO fiber is praised as "super fiber in 21st century", and its strength is the highest among existing chemical fibers. The heat resistance temperature can reach 600 DEG C, and the PBO fiber does not burn and shrink in the flame. The heat resistance and flame resistance are higher than those of other organic fibers, and the impact resistance, friction resistance and dimensional stability are very excellent. The present application firstly proposes to use PBO fiber as a reinforcing body to prepare a bulletproof helmet, thereby solving the problems of poor bulletproof performance of the existing aramid helmet and poor stability of the ultra-high molecular weight polyethylene helmet.

[0036] In some embodiments, the preparation method further comprises the following steps:

[0037] The prepreg is centrally embedded in the mold.

[0038] The mold with the prepreg embedded therein is pre-molded, and then the mold is opened to check whether the state of the prepreg is deviated. When the prepreg is not abnormally deviated, the hot pressing treatment is performed.

[0039] In some embodiments, the deviation includes a deviation of the overall position of the prepreg and / or a deviation between the plurality of layers of reinforcing material of the prepreg.

[0040] In some embodiments, the hot pressing treatment comprises a plurality of hot pressing stages, and the temperature and pressure of the plurality of hot pressing stages from front to back in time sequence have an increasing change rule.

[0041] In some embodiments, the hot pressing treatment specifically comprises the following process:

[0042] Keep the pressure 1-2Mpa, and the temperature rises to 60-70℃, open the mold and release the gas 2-3 times, close the mold, and complete the first hot pressing stage.

[0043] Increase the pressure to 10-15Mpa, and the temperature rises to 75-90℃, open the mold and release the gas 2-3 times, close the mold, and complete the second hot pressing stage.

[0044] Increase the pressure to 25-30Mpa, and continuously increase the temperature to 120-130℃, keep the temperature and pressure for 5-10 minutes, and complete the third hot pressing stage.

[0045] Preferably, the surface temperature of the prepreg is maintained below 150℃ during the third hot pressing stage.

[0046] In some embodiments, the hot pressing process further comprises the following steps:

[0047] In the final stage of the hot pressing process, the PBO fiber reinforced bulletproof helmet is cooled to 40-50℃ by a cooling liquid and taken out of the mold.

[0048] As some typical application examples of the above technical solutions, the hot pressing process can include the following steps:

[0049] Select the already cut and shaped prepreg, ensure that the outer surface layer is smooth and defect-free, the side surface of the cut edge is neat, and the layers are not adhered to each other; embed the pre-impregnated fiber cloth in the mold, and position it in the center of the four sides; open the mold after 3-5 seconds, observe whether the fiber cloth has overall displacement or excessive displacement between layers during the mold closing process, and adjust and calibrate in time. Keep the pressure 1-2Mpa, and the temperature rises to 60-70℃; open the mold and release the gas 2-3 times, close the mold; increase the pressure to 10-15Mpa. When the temperature rises to 75-90℃, open the mold and release the gas 2-3 times, close the mold. Keep the material temperature constant at 90℃, increase the pressure to 25-30Mpa, and continuously increase the temperature; ensure that the material temperature is constant at 120-130℃, the surface temperature does not exceed 150℃, keep the temperature and pressure for 5-10 minutes, and record the actual temperature of the pressed material. Keep the pressure constant, and cool down by introducing a cooling liquid; when the temperature drops to 40-50℃, open the mold, and take out the helmet shell.

[0050] The present application is directed to the process optimization of PBO fiber composite bulletproof helmet, which is different from the traditional high-performance fiber material. PBO fiber has the characteristic of smooth surface, so it is very easy to cause interlayer slip during the mold hot pressing process, resulting in a decrease in the yield of finished products. Therefore, in the preparation method provided by the present application, a pre-molding process is also needed before formal molding, that is, after the mold is closed, a certain pressure is applied, but no heating is performed, that is, cold pressing, the purpose of which is to fix the material to a certain extent by using pressure to prevent deviation during formal molding. After a few seconds of molding, the mold is opened to observe whether displacement occurs; and during the formal molding and hot pressing process, special attention needs to be paid to the stepwise increase of pressure and temperature to avoid the problem of thermal stress deviation caused by direct single-stage hot pressing.

[0051] In some embodiments, the preparation method can further include:

[0052] Before the glue dipping, the surface of the reinforcing material layer is modified by using low-temperature plasma.

[0053] After the modification, the reinforcing material layer is combined with the resin by glue dipping to obtain the prepreg.

[0054] The above embodiments improve the surface roughness of PBO fiber by surface treatment, thereby enhancing the interfacial bonding with the resin, improving the preparation yield and overall performance.

[0055] PBO fiber is known as "21st century super fiber" due to its excellent properties such as high strength, high modulus, high thermal stability, and high flame retardance, and is widely used in individual protection, aerospace, automotive industry and many other engineering fields. However, PBO fiber has a smooth surface and poor interfacial bonding with resin. The key point is to find a suitable resin to combine with PBO fiber to maximize the effect of PBO fiber. The resin used in the present application can add a small amount of nano material (carbon nanotube, graphene, etc.) to improve the interfacial bonding force with PBO fiber, or use low-temperature plasma to modify the surface of PBO fiber, thereby improving the surface activity of PBO fiber and increasing the surface roughness of the fiber, realizing good chemical bonding and mechanical interlocking between the fiber and the matrix, exploring the best modification process parameters, and preparing modified PBO fiber / resin composite material.

[0056] The technical solutions of the present application are further described in detail below through several embodiments in conjunction with the accompanying drawings. However, the selected embodiments are only used to illustrate the present application, and do not limit the scope of the present application.

[0057] Example 1

[0058] This example illustrates the preparation process of a PBO fiber bulletproof helmet, as shown below:

[0059] Select the PBO woven multilayer prepreg which has been cut into shape, the resin of the prepreg is phenolic resin, ensure the outer surface layer is smooth and defect-free, the side surface of the cutting edge is neat, and the layers cannot be adhered to each other; embed the pre-impregnated fiber cloth into the mold, the position is in the middle of four sides; close the mold for about 4 seconds, then open it, observe whether the fiber cloth has overall displacement or displacement between layers during the closing process, adjust and calibrate in time. Keep the pressure at 1Mpa, and the temperature rises to 65℃; open the mold and release the gas twice, close the mold; increase the pressure to 10Mpa. When the temperature rises to 80℃, open the mold and release the gas twice, close the mold. Keep the material temperature at 90℃, increase the pressure to 30Mpa, and continue to heat; ensure that the material temperature is constant at 125℃, the surface temperature is not more than 150℃, and the temperature is kept for 10 minutes, record the actual temperature of the pressed material. Keep the pressure constant, and cool down by circulating cooling liquid; when the temperature drops to 40℃, open the mold, take out the helmet, and obtain a PBO fiber bulletproof helmet.

[0060] Comparative Example 1

[0061] This comparative example is basically the same as Example 1, the main difference is that the PBO woven cloth in Example 1 is replaced by aramid woven cloth.

[0062] The bulletproof performance test of the bulletproof helmet prepared in Example 1 and Comparative Example 1 is shown in Tables 1-4 as follows:

[0063] Table 1: Test results of aramid fiber / phenolic resin helmet against 1.1g simulated fragments

[0064]

[0065] Table 2: Test results of PBO fiber / phenolic resin helmet against 1.1g simulated fragments

[0066]

[0067] Table 3: Test results of aramid fiber / phenolic resin helmet against 7.62mm pistol bullets

[0068]

[0069] Table 4: Test results of PBO fiber / phenolic resin helmet against 7.62mm pistol bullets

[0070]

[0071] It can be seen that the anti-bullet helmet prepared by adopting PBO fiber cloth as the reinforcing body and combining with the resin matrix has high impact resistance, excellent high temperature resistance, non-combustion and non-shrinkage in the flame. When impacted by a bullet, a large amount of bullet impact kinetic energy can be absorbed, the overall bulletproof performance of the helmet is improved, the indentation of the helmet caused by the bullet is reduced, and the non-penetrating damage of the bullet to the human body is reduced. Table 1 and Table 2 are respectively the test results of the helmets prepared by aramid fiber and PBO fiber against 1.1g simulated fragments, wherein the surface density of the helmet prepared by the PBO fiber in the embodiment is 6.41 kg / m 2 , the V50 value against 1.1g simulated fragments is 611.67 m / s, and the specific energy absorption value is 32.1 J·m 2 / kg; the surface density of the helmet prepared by aramid fiber in the comparative example is 6.58 kg / m 2 , the V50 value against 1.1g simulated fragments is 499.83 m / s, and the specific energy absorption value is 20.88 J·m 2 / kg. The energy absorption capacity of the helmet prepared by PBO fiber is 34.95% higher than that of the aramid fiber. Table 3 and Table 4 are respectively the test results of the helmets prepared by aramid fiber and PBO fiber against 7.62mm pistol bullets, wherein the surface density of the helmet prepared by the PBO fiber in the embodiment is 6.41 kg / m 2 , the indentation value against 7.62mm pistol bullets is 17.5mm; the surface density of the helmet prepared by aramid fiber in the comparative example is 6.58 kg / m 2 , the indentation value against 7.62mm pistol bullets is 17.67mm. The surface density of the helmet prepared by the PBO fiber in the embodiment is 3% less than that of the helmet prepared by aramid fiber in the comparative example, and the indentation value is reduced by 1%. The helmet prepared by PBO fiber can improve the bulletproof ability and reduce the indentation value, thereby reducing the non-penetrating damage of the bullet to the human body.

[0072] Embodiment 2

[0073] The embodiment is basically the same as embodiment 1, and the main difference is that:

[0074] The resin is replaced by epoxy resin, and the weaving method of the PBO fiber is selected as two-dimensional plain cloth weaving.

[0075] The preparation process conditions are as follows: the pressure is kept at 2Mpa, and the temperature is raised to 70℃; the mold is opened and the gas is released for 3 times, and the mold is closed; the pressure is increased to 15Mpa. When the temperature is raised to 90℃, the mold is opened and the gas is released for 3 times, and the mold is closed. The material temperature is kept at 90℃, the pressure is increased to 25Mpa, and the temperature is continuously raised; the material temperature is kept at 120℃, the surface temperature is not more than 150℃, and the temperature is kept for 5 minutes, and the actual temperature of the pressed material is recorded. The pressure is kept constant, and the cooling liquid is introduced for cooling; when the temperature is reduced to 50℃, the mold is opened, and the helmet shell is taken out, and a PBO fiber anti-bullet helmet is obtained.

[0076] Example 3

[0077] This example is substantially the same as Example 1, the main difference is that:

[0078] The resin is replaced by bismaleimide resin, and the weaving method of PBO fiber is selected as two-dimensional plain cloth weaving.

[0079] The conditions of the preparation process are: maintaining the pressure at 1.5 MPa, and the temperature is raised to 60°C; opening the mold to release the gas for 3 times, and closing the mold; increasing the pressure to 13 MPa. When the temperature is raised to 75°C, opening the mold to release the gas for 3 times, and closing the mold. The material temperature is kept constant at 90°C, and the pressure is increased to 28 MPa, and the temperature is continuously raised; ensuring that the material temperature is kept constant at 130°C, and the surface temperature does not exceed 150°C, and the temperature and pressure are kept for 8 minutes, and the actual temperature of the pressed material is recorded. Keeping the pressure constant, and cooling by passing cooling liquid; when the temperature is reduced to 45°C, opening the mold, and taking out the helmet, and obtaining a PBO fiber bulletproof helmet.

[0080] The PBO fiber bulletproof helmet prepared in the above example has similar performance to the PBO fiber bulletproof helmet provided in Example 1, and will not be repeated.

[0081] Example 4

[0082] This example is substantially the same as Example 1, the main difference is that:

[0083] The single-walled carbon nanotubes with a mass fraction of 1.5% are doped in the resin, and after doping 1.5% of carbon nanotubes in the resin, the interfacial bonding strength of the resin and the fiber reaches 65.34 MPa, which is increased by 44.33 MPa compared with the interfacial bonding strength of the resin without adding carbon nanotubes.

[0084] The doping amount of carbon nanotubes is adjusted, and a plurality of test results are obtained, and the Figure 2 The influence of different doping amounts of carbon nanotubes on the interfacial bonding strength is shown, and it can be clearly seen that the doping of carbon nanotubes is most helpful to the interfacial bonding strength when the content is 1.5%; generally, the doping in the range of 0.5-3.0% can obtain significant improvement of the interfacial bonding strength.

[0085] Example 5

[0086] This example is substantially the same as Example 1, the main difference is that:

[0087] After the PBO fiber is subjected to oxygen plasma treatment (oxygen environment, pressure 30 Pa, treatment power 150 W, treatment time 5 min) and then subjected to pre-impregnation and hot pressing. When the treatment time is 5 min, the interfacial bonding strength of the fiber and the resin reaches a maximum of 56.6 MPa, and when the treatment power is 120 W, the interfacial bonding strength of the fiber and the resin reaches a maximum of 41.8 MPa.

[0088] The power and time of the plasma treatment are adjusted to obtain a series of results, as shown in Figure 3 and Figure 4 It can be determined that, similar to the rule of doping carbon nanotubes in the resin, appropriate power and time of plasma treatment can help to improve the interfacial bonding strength.

[0089] Based on the above examples and comparative examples, it can be determined that the present application first proposes to use PBO fiber as a reinforcing body to prepare a bulletproof helmet, solving the problems of poor bulletproof performance of the existing aramid helmet and poor stability of the ultra-high molecular weight polyethylene helmet. The preparation method provided by the present application avoids the deviation problem caused by the smooth surface of the PBO fiber and the poor combination of the resin by optimizing the setting of the hot pressing process, and a PBO fiber reinforced bulletproof helmet with stable shape and excellent performance is prepared.

[0090] 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 shall be covered within the protection scope of the present application.

Claims

1. A PBO fiber reinforced ballistic helmet, characterized by, The PBO fiber reinforced bulletproof helmet has a shell, the shell includes a resin matrix and a reinforcing material layer, the reinforcing material layer is distributed in the resin matrix, and adjacent reinforcing material layers are fixedly combined by the resin matrix. The reinforcing material layer contains PBO fibers.

2. The PBO fiber reinforced ballistic helmet of claim 1, wherein, The reinforcing material layer includes two-dimensional plain fiber cloth and / or three-dimensional woven fiber cloth containing PBO fibers. Preferably, the reinforcing material layer is composed of pure PBO fibers.

3. The PBO fiber reinforced ballistic helmet of claim 1, wherein, The material of the resin matrix includes any one or a combination of two or more of epoxy resin, phenolic resin, bismaleimide resin, and polyimide resin. And / or, the mass fraction of the resin matrix in the bulletproof helmet is 10%-20%.

4. The PBO fiber reinforced ballistic helmet of claim 1, wherein, The resin matrix is also doped with carbon nanomaterial, and the mass fraction of the nanomaterial in the resin matrix is 0.5-3%. Preferably, the carbon nanomaterial includes carbon nanotubes and / or graphene.

5. A method of manufacturing a PBO fiber reinforced ballistic helmet according to any one of claims 1 to 4, characterized in that, Comprise: Provide a prepreg, the prepreg includes a plurality of reinforcing material layers formed at least by PBO fibers and a resin attached in the reinforcing material layers; The prepreg is heat-pressed by a mold to cure the resin and shape the prepreg, and a PBO fiber reinforced bulletproof helmet is obtained.

6. The production method according to claim 5, wherein Also include: The prepreg is centrally embedded in the mold; The mold with the prepreg embedded inside is pre-molded, then the mold is opened, the state of the prepreg is checked for deviation, and when the prepreg does not deviate abnormally, the heat-pressing process is performed.

7. The production method according to claim 6, wherein The deviation includes deviation of the overall position of the prepreg and / or deviation between the plurality of reinforcing material layers of the prepreg.

8. The preparation method according to claim 5, characterized in that, The heat-pressing process includes a plurality of heat-pressing stages, and the temperature and pressure of the plurality of heat-pressing stages from front to back in time sequence have an increasing change rule; Preferably, the heat-pressing process specifically includes: Maintain the pressure at 1-2 MPa, the temperature rises to 60-70℃, open the mold and release the gas 2-3 times, close the mold, and complete the first heat-pressing stage; Increase the pressure to 10-15 MPa, the temperature rises to 75-90℃, open the mold and release the gas 2-3 times, close the mold, and complete the second heat-pressing stage; Increase the pressure to 25-30 MPa, continue to increase the temperature to 120-130℃, and keep the temperature and pressure for 5-10 minutes to complete the third heat-pressing stage; Preferably, when the third heat-pressing stage is performed, the surface temperature of the prepreg is maintained below 150℃.

9. The production method according to claim 8, characterized by, The heat-pressing process also includes: The final stage of the heat-pressing process, the PBO fiber reinforced bulletproof helmet is cooled to 40-50℃ by cooling liquid and taken out of the mold.

10. The method of claim 5, wherein, Also include: Before impregnation, the surface of the reinforcing material layer is modified by low-temperature plasma; After the modification process, the reinforcing material layer is impregnated with the resin to obtain the prepreg.

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