Bulletproof vest with synergistic auxetic structure and shear thickening fluid and preparation method of bulletproof vest

Abstract

The invention relates to the technical field of body armor, and discloses an outer protective layer. The auxetic structural layer comprises an upper functional layer, a middle functional layer and a lower functional layer from outside to inside, a plurality of polygonal concave buffer grooves distributed at equal intervals are formed in the auxetic structural layer, and the buffer grooves of the auxetic structural layer are filled with shear thickening liquid; when the body armor is impacted by external force, the groove wall fiber network of the multilateral concave buffer groove buffers the external impact force through stretching deformation, the shear thickening liquid is thickened, and the fiber network around the damage bearing part of the body armor is locked to form a local rigid supporting area; the inner protective layer and the auxetic structure layer are located between the outer protective layer and the inner protective layer, the beneficial effects of being excellent in synergistic protective performance, uniform in impact energy dispersion and capable of assisting nursing are achieved, and the problems that a traditional body armor is limited in energy absorption efficiency, blunt injuries are easily caused by impact stress concentration, and the service life is long are solved. The auxiliary nursing function of the injured part is lacked, and primary treatment cannot be carried out on the wound in time.

Description

Technical Field

[0001] This invention relates to the field of bulletproof vest technology, specifically to a bulletproof vest with a synergistic tension structure and a shear thickening fluid, and its preparation method. Background Technology

[0002] Bulletproof vests, as an important type of personal protective equipment, are widely used in military, public security, and other fields. Their core function is to protect vital parts of the body from injury by resisting the impact of high-speed impact objects such as bullets and shrapnel. With the continuous upgrading of weapons and equipment, the requirements for the protective performance, lightweight design, and comfort of bulletproof vests are also increasing.

[0003] Current bulletproof vests are mainly made of high-performance fiber fabrics (such as ultra-high molecular weight polyethylene fiber, aramid fiber, etc.), which dissipate impact energy through the stretching and breaking of fibers and friction between fabrics. However, when subjected to high-speed impacts, traditional fiber bulletproof vests often have problems such as limited energy absorption efficiency and significant impact stress concentration, which can easily lead to large indentation deformation at the injury site, thereby causing blunt force trauma to the human body. In addition, existing bulletproof vests lack auxiliary care functions for injured areas during impact protection, making it impossible to provide timely initial treatment for potential injuries and affecting the efficiency of subsequent treatment.

[0004] Therefore, a bulletproof vest with a synergistic tensile structure and a shear thickening fluid, and its preparation method, are proposed to solve the above problems. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a bulletproof vest that combines a tensile structure with a shear-thickening fluid. This vest offers excellent synergistic protection, uniform impact energy dispersion, and auxiliary care, solving the problems of limited energy absorption efficiency, impact stress concentration leading to blunt force injuries, lack of auxiliary care for injured areas, and inability to provide timely initial treatment for wounds in traditional bulletproof vests.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: A bulletproof vest with a synergistic expansion structure and shear thickening fluid, comprising: Outer protective layer; The tensile structure layer includes an upper functional layer, a middle functional layer, and a lower functional layer arranged sequentially from the outside to the inside. Multiple equally spaced polygonal concave buffer grooves are formed on the tensile structure layer, and these grooves are filled with a shear-thickening fluid. When the bulletproof vest is impacted by an external force, the fiber network of the groove walls of the polygonal concave buffer grooves buffers the external impact force through tensile deformation and thickens the shear-thickening fluid, thus locking the fiber network around the impact-bearing part of the bulletproof vest to form a localized rigid support area. An inner protective layer, wherein the tensile structure layer is located between the outer protective layer and the inner protective layer.

[0007] Preferably, the polygonal wall of the upper functional layer is provided with a connecting groove, and adjacent buffer grooves are connected through the connecting groove.

[0008] Preferably, a hollow hole is formed in the polygonal wall of the intermediate functional layer, the hollow hole is filled with magnesium sulfate solution, and the hollow hole is located between the upper functional layer and the lower functional layer.

[0009] Preferably, the lower functional layer has multiple tapered holes on its polygonal wall, and the flared ends of the tapered holes are connected to the hollow holes of the middle functional layer.

[0010] Preferably, the tapered end of the tapered hole is located on the inner protective layer.

[0011] Preferably, the polyhedral concave fiber structure of the tensile structural layer is snowflake-shaped.

[0012] Preferably, the connecting groove is located between the upper functional layer and the outer protective layer.

[0013] Preferably, when the upper functional layer is subjected to an external impact, the hollow pores are compressed, and the magnesium sulfate solution inside the hollow pores is compressed and permeates into the inner protective layer through the flared opening of the conical pores.

[0014] Preferably, the outer protective layer, the tensile structure layer, and the inner protective layer are made of ultra-high molecular weight polyethylene fiber material; the fiber surface modification layer is grafted with γ-aminopropyltriethoxysilane after plasma treatment to form a nano-SiO2 anchoring structure.

[0015] A method for preparing a bulletproof vest with a synergistic effect of an expansion structure and a shear thickening fluid includes the following steps: S1. Select ultra-high molecular weight polyethylene fiber and perform plasma treatment on the fiber surface; immerse the treated fiber in γ-aminopropyltriethoxysilane solution to graft silane onto the fiber surface and form a nano-SiO2 anchoring structure. S2. Select silica nanoparticles and polyethylene glycol at a mass ratio of 3:7, and ultrasonically disperse for 30 min to obtain a uniform and stable shear thickening liquid; dissolve magnesium sulfate solid in deionized water at a mass concentration of 15%-20%, and stir until completely dissolved to obtain a clear magnesium sulfate solution. S3. The upper, middle and lower functional layers of the tensile structure layer are all made of the above-mentioned modified ultra-high molecular weight polyethylene fiber, which is prepared by compression molding process and is formed as a grid-like polygonal concave fiber structure. S4. The modified ultra-high molecular weight polyethylene fiber is laminated to prepare an outer protective layer and an inner protective layer. After molding, it is cut into a blank with the same size as the tensile structure layer. S5. Then, the shear thickening liquid is injected into the buffer tank, and the prepared magnesium sulfate solution is injected into the hollow pores of the intermediate functional layer, with a filling amount of 90% of the hollow pore volume; S6. Place the assembled blank into a hot press molding machine. The molecular chains of ultra-high molecular weight polyethylene fibers cross-link, so that the outer protective layer, tensile structure layer and inner protective layer are firmly bonded together to complete the preparation of the bulletproof vest.

[0016] (III) Beneficial Effects Compared with the prior art, the present invention provides a bulletproof vest with a synergistic effect of tensile structure and shear thickening fluid and its preparation method, which has the following beneficial effects: 1. This invention achieves a synergistic effect between the tensile structure and the shear thickening fluid by filling the polygonal concave buffer groove within the tensile structure layer. When the bulletproof vest is impacted, the fiber network of the polygonal concave buffer groove wall undergoes tensile deformation using the negative Poisson's ratio characteristic of the tensile structure, dispersing the concentrated impact force over a wider area. Simultaneously, the high-speed impact and the strong shearing effect generated by the deformation of the tensile structure layer cause the shear thickening fluid to rapidly thicken and solidify, locking the fiber network around the impact area to form a localized rigid support zone. This effectively prevents further penetration of the impacting material, significantly improving energy absorption efficiency and protective performance, and reducing the risk of blunt force trauma.

[0017] 2. The connecting groove in the upper functional layer of the present invention enables adjacent buffer grooves to be interconnected. On the one hand, it can realize the flow and replenishment of shear thickening fluid between each buffer groove, ensuring that the shear thickening fluid around the impact area can respond in time and play a role. On the other hand, the connecting groove can further disperse the impact stress, avoid stress concentration leading to local protection failure, and improve the uniformity and reliability of the overall protection.

[0018] 3. The hollow pores of the intermediate functional layer of this invention are filled with magnesium sulfate solution. When subjected to external impact, the compression effect of the upper functional layer causes the magnesium sulfate solution in the hollow pores to permeate through the conical pores of the lower functional layer to the inner protective layer. The magnesium sulfate solution has the effects of reducing swelling, relieving pain, and reducing inflammation, and can provide initial auxiliary care for local soft tissue injuries caused by impact, buying time for subsequent treatment and improving the practicality and humanized design of the bulletproof vest.

[0019] 4. The present invention uses ultra-high molecular weight polyethylene fiber material to make each protective layer. This material has the advantages of high strength, lightweight, and corrosion resistance, which can reduce the overall weight of the bulletproof vest while ensuring protective performance and improving wearing comfort. The nano-SiO2 anchoring structure formed by grafting γ-aminopropyltriethoxysilane onto the fiber surface after plasma treatment can enhance the interfacial bonding force between the fiber and the shear thickening liquid and magnesium sulfate solution, thereby improving structural stability and service life.

[0020] 5. The tensile structure layer of the present invention adopts a snowflake-grid polygonal concave fiber structure, which has a good negative Poisson's ratio effect and mechanical stability, and can efficiently disperse and transmit impact energy; the flared end of the conical hole is connected to the hollow hole, and the conical end faces the inner protective layer, which can ensure that the magnesium sulfate solution can smoothly and directionally penetrate into the injured area of ​​the inner protective layer under impact, thereby improving the auxiliary care effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the tensile structure layer of the present invention.

[0023] Figure 3 This is a schematic diagram of the bearing portion of the present invention in a state of tension.

[0024] Figure 4 This is a side sectional view of the tensile structural layer of the present invention.

[0025] Figure 5 This is a schematic diagram of the combination of the tensile structure layer and the shear thickening liquid of the present invention.

[0026] Figure 6 This is a partial structural diagram of the tensile structure layer of the present invention.

[0027] Figure 7 This is an exploded view of a portion of the tensile structure layer of the present invention.

[0028] Figure 8 This is a schematic diagram of the state of the lower functional layer of the present invention after being impacted.

[0029] In the picture: 1. Outer protective layer; 2. Tensile structural layer; 3. Inner protective layer; 4. Upper functional layer; 401. Connecting slot; 5. Intermediate functional layer; 501. Hollow hole; 6. Lower functional layer; 601. Tapered hole; 602. Tapered opening; 7. Buffer groove; 8. Injury site. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] In addition, a fixed connection refers to a connection in which parts or components are fixed and there is no relative movement; a transmission connection refers to a connection in which mechanical motion or torque is transmitted to other working parts through a transmission component; a sliding connection refers to a connection in which two objects are in contact but not fixed and can slide relative to each other; and a rotational connection refers to a connection in which two objects are in contact but not fixed and can rotate relative to each other.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] This embodiment provides a bulletproof vest with a synergistic structure and shear thickening fluid, and its preparation method, which has the following technical features.

[0035] Please see Figures 1 to 8 , A bulletproof vest with a synergistic expansion structure and shear thickening fluid, comprising: Outer protective layer 1; The tensile structure layer 2 includes an upper functional layer 4, a middle functional layer 5, and a lower functional layer 6 arranged sequentially from the outside to the inside. Multiple polygonal concave buffer grooves 7 are formed on the tensile structure layer 2 with equal spacing. The buffer grooves 7 of the tensile structure layer 2 are filled with shear thickening fluid. When the bulletproof vest is impacted by external force, the fiber network of the wall of the polygonal concave buffer groove 7 buffers the external impact force through tensile deformation and thickens the shear thickening fluid, locking the fiber network around the bulletproof vest's wound-bearing part 8 to form a local rigid support area. The inner protective layer 3 and the tensile structural layer 2 are located between the outer protective layer 1 and the inner protective layer 3.

[0036] See Figures 4 to 8 The upper functional layer 4 has a connecting groove 401 on its polygonal wall, and adjacent buffer grooves 7 are connected through the connecting groove 401. The middle functional layer 5 has a hollow hole 501 formed in its polygonal wall, and the hollow hole 501 is filled with magnesium sulfate solution. The hollow hole 501 is located between the upper functional layer 4 and the lower functional layer 6. The lower functional layer 6 has multiple conical holes 601 on its polygonal wall. The flared end of the conical hole 601 is connected to the hollow hole 501 of the middle functional layer 5. The conical end of the conical hole 601 is located on the inner protective layer 3. The polyhedral concave fiber structure of the tensile structure layer 2 is snowflake-shaped. The connecting groove 401 is located between the upper functional layer 4 and the outer protective layer. Between layers 1 and 2, when the upper functional layer 4 is subjected to external impact, the hollow hole 501 is compressed. The magnesium sulfate solution inside the hollow hole 501 is compressed and permeates into the inner protective layer 3 through the flared opening 602 of the conical hole 601. This allows the magnesium sulfate solution in the wound-bearing part 8 of the bulletproof vest to reduce swelling and pain in the blunt force trauma area of ​​the human body: by regulating the osmotic pressure of local human tissues, it promotes the return of excess water in the interstitial space and reduces swelling caused by soft tissue impact; at the same time, it relieves local vascular spasm, improves microcirculation, and thus reduces pain; and promotes the absorption of bruises: for bruises and swellings formed after impact, it improves the local blood circulation and helps accelerate the dissipation of subcutaneous bruises.

[0037] The outer protective layer 1, the tensile structure layer 2, and the inner protective layer 3 are made of ultra-high molecular weight polyethylene fiber material; the fiber surface modification layer is grafted with γ-aminopropyltriethoxysilane after plasma treatment to form a nano-SiO2 anchoring structure.

[0038] A method for preparing a bulletproof vest with a synergistic effect of an expansion structure and a shear thickening fluid includes the following steps: S1. Substrate Fiber Treatment: Select ultra-high molecular weight polyethylene fiber and perform plasma treatment on the fiber surface. The treatment conditions are: plasma power 150-200W, treatment time 10-15min, and working gas is argon. Then, immerse the treated fiber in γ-aminopropyltriethoxysilane solution at room temperature for 2-3h. After removal, dry it in an oven at 80-90℃ for 1h to graft silane onto the fiber surface and form a nano-SiO2 anchoring structure for later use. S2. Preparation of functional liquid: The shear thickening liquid is prepared by mixing silica nanoparticles (particle size 100-200nm) and polyethylene glycol (molecular weight 2000) at a mass ratio of 3:7 and ultrasonically dispersing for 30min to obtain a uniform and stable shear thickening liquid for later use. Magnesium sulfate solution: Dissolve solid magnesium sulfate in deionized water at a mass concentration of 15%-20%, and stir until completely dissolved to obtain a clear magnesium sulfate solution for later use. S3. Preparation of each sublayer of the tensile structural layer: The upper functional layer 4, the middle functional layer 5, and the lower functional layer 6 of the tensile structure layer are all made of the above-mentioned modified ultra-high molecular weight polyethylene fiber, which is prepared by compression molding process and is formed as a grid-like polygonal concave fiber structure. upper functional layer 4 preparation The modified ultra-high molecular weight polyethylene fiber was laid in a snowflake-shaped polygonal concave mold, and the molding temperature was 120-130℃, the pressure was 5-8MPa, and the temperature and pressure were maintained for 10 minutes.

[0039] After molding, a connecting groove 401 is machined at the preset position of the mold. The connecting groove 401 needs to penetrate the groove wall of the adjacent polygonal concave structure, and the position of the connecting groove 401 is controlled on the side where the upper functional layer 4 and the outer protective layer 1 are attached, so as to obtain the upper functional layer 4 blank for later use. Preparation of intermediate functional layer 5 Modified ultra-high molecular weight polyethylene fiber is also used, and it is laid in a grid-like polygonal concave mold. The molding parameters are the same as those of the upper functional layer 4. After forming, hollow holes 501 are machined inside the polygonal wall of the intermediate functional layer 5. The position of the hollow holes 501 should correspond to the lower part of the connecting groove 401 of the upper functional layer 4 and the upper part of the conical hole 601 of the lower functional layer 6 to form a channel foundation that runs through the upper and lower parts, and the blank of the intermediate functional layer 5 is obtained for later use. Fabrication of lower functional layer 6 Modified ultra-high molecular weight polyethylene fiber is molded in a corresponding mold. After molding, a conical hole 601 is processed on its polygonal wall. The flared end 602 of the conical hole 601 matches the hollow hole 501 in the intermediate functional layer 5, and the conical end faces the inner protective layer 3. The diameter gradient of the conical hole 601 is: 2-3 mm at the flared end and 0.5-1 mm at the conical end, to obtain the blank of the lower functional layer 6 for later use; S4. The modified ultra-high molecular weight polyethylene fiber is laminated to prepare the outer protective layer 1 and the inner protective layer 3. The number of fiber layers is 15-20, the molding temperature is 125℃, the pressure is 6MPa, and the heat and pressure are maintained for 15min. After molding, it is cut into a blank with the same size as the tensile structure layer for later use. S5, Functional Liquid Filling and Interlayer Assembly Shear thickener filling The upper functional layer 4, the middle functional layer 5, and the lower functional layer 6 are stacked and positioned in sequence to form a complete grid-like polygonal concave buffer groove 7 structure.

[0040] The shear thickening liquid is then injected into the buffer tank 7, and the liquid in the adjacent buffer tanks 7 is connected by the connecting tank 401. After filling, the liquid is pre-dried at 60°C for 30 minutes to ensure that the liquid is evenly distributed and there is no leakage. magnesium sulfate solution filling The prepared magnesium sulfate solution is injected into the hollow hole 501 of the intermediate functional layer 5, and the filling amount is 90% of the volume of the hollow hole 501. After filling, the temporary opening of the hollow hole 501 is sealed to prevent the solution from overflowing. S6, Three-layer composite assembly Stack the outer protective layer 1, the tensile structure layer 2, and the inner protective layer 3 in sequence. During the stacking process, ensure that the conical end of the conical hole 601 of the tensile structure layer 2 is tightly fitted with the inner protective layer 3 to prevent misalignment between layers. Place the assembled blank into a hot press forming machine and set the process parameters: temperature 110-120℃, pressure 8-10MPa, and heat and pressure holding for 20 minutes. During the curing process, the molecular chains of ultra-high molecular weight polyethylene fibers cross-link, which firmly binds the outer protective layer 1, the tensile structure layer 2, and the inner protective layer 3 into one unit; at the same time, it ensures that the interconnecting grooves 401, hollow holes 501, and conical holes 601 of each functional layer are not damaged. After curing, the green body is cooled to room temperature in the furnace and then removed. After cooling, the blank is trimmed and polished to remove burrs and excess edges, so that the bulletproof vest has a neat appearance. Simulated impact tests were conducted to detect the tensile deformation capacity of the buffer tank fibers, the thickening and locking effect of the shear thickening liquid, and the penetration effect of magnesium sulfate solution into the inner protective layer through the conical holes. After passing the inspection, the finished bulletproof vest is produced.

[0041] In summary, this bulletproof vest, designed with a tensile structure and shear-thickening fluid in synergy, initially blocks and disperses the impact energy when struck by high-speed projectiles such as bullets and shrapnel. Subsequently, the impact energy is transferred to the tensile structure layer 2, where the fiber network of the polygonal concave buffer groove 7 undergoes tensile deformation, utilizing the tensile structure's characteristics to disperse the impact energy. Simultaneously, the shear-thickening fluid thickens and solidifies under strong shear, locking the fiber network to form a localized rigid support zone, effectively preventing the intrusion of the projectile. Finally, the inner protective layer 3 further buffers the remaining impact energy, protecting the wearer from injury. Furthermore, the compression effect of the impact allows the magnesium sulfate solution in the intermediate functional layer 5 to permeate through the conical holes 601 into the inner protective layer 3, providing initial auxiliary protection against potential damage and enhancing the practicality and human-centered design of the vest.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bulletproof vest with a synergistic tension structure and shear thickening fluid, characterized in that, include: Outer protective layer (1); The tensile structure layer (2) includes an upper functional layer (4), a middle functional layer (5) and a lower functional layer (6) arranged sequentially from the outside to the inside. Multiple polygonal concave buffer grooves (7) are formed on the tensile structure layer (2) and are evenly distributed. The buffer grooves (7) of the tensile structure layer (2) are filled with shear thickening liquid. When the bulletproof vest is impacted by external force, the fiber network of the wall of the polygonal concave buffer groove (7) buffers the external impact force through tensile deformation and thickens the shear thickening liquid, locking the fiber network around the bulletproof vest's injury-bearing part (8) to form a local rigid support area. The inner protective layer (3) is located between the outer protective layer (1) and the inner protective layer (3).

2. The bulletproof vest with a synergistic effect of a tensile structure and a shear thickening fluid according to claim 1, characterized in that, The upper functional layer (4) has a connecting groove (401) on its polygonal wall, and adjacent buffer grooves (7) are connected through the connecting groove (401).

3. The bulletproof vest with a synergistic effect of a tensile structure and a shear thickening fluid according to claim 2, characterized in that, Hollow holes (501) are formed in the polygonal wall of the intermediate functional layer (5), and the hollow holes (501) are filled with magnesium sulfate solution. The hollow holes (501) are located between the upper functional layer (4) and the lower functional layer (6).

4. The bulletproof vest with a synergistic tension structure and shear thickening fluid according to claim 3, characterized in that, The lower functional layer (6) has multiple tapered holes (601) on its polygonal wall, and the flared end of the tapered hole (601) is connected to the hollow hole (501) of the middle functional layer (5).

5. The bulletproof vest with a synergistic tension structure and shear thickening fluid according to claim 4, characterized in that, The tapered end of the tapered hole (601) is located on the inner protective layer (3).

6. The bulletproof vest with a synergistic tension structure and shear thickening fluid according to claim 1, characterized in that, The tensile structure layer (2) has a polygonal concave fiber structure in the shape of a grid snowflake.

7. The bulletproof vest with a synergistic tension structure and shear thickening fluid according to claim 5, characterized in that, The connecting groove (401) is located between the upper functional layer (4) and the outer protective layer (1).

8. The bulletproof vest with a synergistic effect of a tensile structure and a shear thickening fluid according to claim 7, characterized in that, When the upper functional layer (4) is subjected to external impact, the hollow hole (501) is compressed. Under pressure, the magnesium sulfate solution in the hollow hole (501) permeates into the inner protective layer (3) through the flared opening (602) of the conical hole (601).

9. A bulletproof vest with a synergistic tensile structure and shear thickening fluid as described in claim 8, characterized in that, The outer protective layer (1), the tensile structure layer (2), and the inner protective layer (3) are made of ultra-high molecular weight polyethylene fiber material; the fiber surface modification layer is grafted with γ-aminopropyltriethoxysilane after plasma treatment to form a nano-SiO2 anchoring structure.

10. A method for preparing a bulletproof vest with a synergistic tension structure and a shear thickening fluid, applicable to the bulletproof vest with a synergistic tension structure and a shear thickening fluid as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Select ultra-high molecular weight polyethylene fiber and perform plasma treatment on the fiber surface; immerse the treated fiber in γ-aminopropyltriethoxysilane solution to graft silane onto the fiber surface and form a nano-SiO2 anchoring structure. S2. Select silica nanoparticles and polyethylene glycol at a mass ratio of 3:7, and ultrasonically disperse for 30 min to obtain a uniform and stable shear thickening liquid; dissolve magnesium sulfate solid in deionized water at a mass concentration of 15%-20%, and stir until completely dissolved to obtain a clear magnesium sulfate solution. S3, the upper functional layer (4), middle functional layer (5) and lower functional layer (6) of the tensile structure layer (2) are all made of the above-mentioned modified ultra-high molecular weight polyethylene fiber, which is prepared by compression molding process and is formed into a grid-like polygonal concave fiber structure. S4. The modified ultra-high molecular weight polyethylene fiber is laminated to prepare an outer protective layer (1) and an inner protective layer (3), and after molding, it is cut into a blank with the same size as the tensile structure layer. S5. Then, the shear thickening liquid is injected into the buffer tank (7), and the prepared magnesium sulfate solution is injected into the hollow hole (501) of the intermediate functional layer (5), with a filling amount of 90% of the hollow hole volume; S6. Place the assembled blank into a hot press molding machine. The molecular chains of ultra-high molecular weight polyethylene fiber cross-link, so that the outer protective layer (1), the tensile structure layer (2), and the inner protective layer (3) are firmly bonded together to complete the preparation of the bulletproof vest.

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