A lightweight and comfortable bulletproof and stab-resistant vest and its preparation method

Abstract

This application provides a lightweight and comfortable bulletproof and stab-resistant vest and its manufacturing method. The first aspect of this application provides a lightweight and comfortable bulletproof and stab-resistant vest, including an outer jacket and a protective chip disposed within the outer jacket. The protective chip includes a first protective layer, a second protective layer, a third protective layer, and a buffer layer stacked sequentially. The bulletproof and stab-resistant vest provided by this application exhibits better responsive protection characteristics during bullet penetration or knife puncture. Furthermore, the prepared aramid non-woven fabric has low surface density, a smooth appearance, is bubble-free, and has excellent softness, allowing for 180° bending. Therefore, the bulletproof and stab-resistant vest provided by this application can reduce the weight of the vest while meeting protection requirements, and improve its softness and wearing comfort.

Description

Technical Field

[0001] This application relates to the field of personal protective equipment technology, and in particular to a lightweight and comfortable bulletproof and stab-resistant vest and its preparation method. Background Technology

[0002] With the increasing complexity of modern battlefield environments, single-protection products that only offer bulletproof or stab protection are insufficient to withstand the diverse forms of physical attacks on the battlefield. Therefore, personal protective equipment (PPE) that combines bulletproof and stab protection has become increasingly popular among combat personnel. Bulletproof and stab-resistant vests, also known as dual-protection vests, are PPE that provide both bulletproof and stab protection.

[0003] Currently, the development of bulletproof and stab-resistant vests mainly focuses on three directions: First, combining them with rigid protective materials to achieve bulletproof and stab-resistant functions. Rigid materials primarily include metals or ceramics. The disadvantage of this approach is that the finished vests are too bulky, lack flexibility, and are extremely uncomfortable to wear, severely affecting normal physical activities such as squatting, jumping, running, and bending arms. Second, physically layering single protective materials with both bulletproof and stab-resistant properties to achieve the same function. The disadvantage of this approach is that the numerous layers of protective materials result in a thick and heavy vest, poor wearing comfort, and difficulty in achieving ideal protective performance. Third, developing composite bulletproof and stab-resistant vests that simultaneously possess bulletproof and stab-resistant functions. Against the backdrop of continuous global socio-economic development and increasing public awareness of safety precautions, the application of personal protective equipment (PPE) has gradually expanded from the original military and police sectors to a broader civilian sector. The demand from security guards, taxi drivers, bank employees, and other personnel is also constantly increasing. Bulletproof and stab-resistant vests have broad market application prospects, but they still suffer from problems such as being heavy, lacking flexibility, and having poor wearing comfort. Therefore, how to reduce the weight of bulletproof and stab-proof vests and improve their softness and wearing comfort is an issue that continues to be of concern to those skilled in the art. Summary of the Invention

[0004] This application provides a lightweight and comfortable bulletproof and stab-resistant vest and its preparation method, which reduces the weight of the bulletproof and stab-resistant vest and improves its softness and wearing comfort.

[0005] The first aspect of this application provides a lightweight and comfortable bulletproof and stab-proof vest, which includes an outer jacket and a protective chip disposed inside the outer jacket. The protective chip includes a first protective layer, a second protective layer, a third protective layer and a buffer layer stacked in sequence.

[0006] The first protective layer comprises 5 to 15 layers of first aramid nonwoven fabric, which is woven from aramid fibers and a first adhesive. The first adhesive includes waterborne polyurethane, 1,4-butanediol, methyltrimethoxysilane, methyltrichlorosilane, melamine and nano-montmorillonite.

[0007] The second protective layer comprises 10 to 25 layers of second aramid nonwoven fabric, which is woven from aramid fibers and a second adhesive. The second adhesive includes waterborne polyurethane, waterborne epoxy resin, methyl methacrylate, ethylene glycol, N-methyldiethanolamine and titanate coupling agent.

[0008] The third protective layer comprises 5 to 12 layers of third aramid nonwoven fabric, which is woven from aramid fibers and a third adhesive, including waterborne polyurethane, aminomethyl silicone oil, ammonium polyphosphate and titanate coupling agent.

[0009] The bulletproof and stab-resistant vest provided in this application has an outer layer worn on a protected individual, and its interior contains a protective chip. In one embodiment... Figure 1 This is a schematic diagram of the structure of the protective chip provided in one embodiment of this application, as shown below. Figure 1 As shown, the protective chip includes a first protective layer 1, a second protective layer 2, a third protective layer 3, and a buffer layer 4 stacked sequentially. The first protective layer 1 is located on the side away from the protected individual, and the buffer layer 4 is located on the side closer to the protected individual. It should be noted that, for ease of explanation, Figure 1 By appropriately modifying the dimensions of each layer, the first protective layer 1, the second protective layer 2, the third protective layer 3, and the buffer layer 4 actually have the same dimensions. Specifically, the first protective layer 1 has the best ballistic protection and flexibility, the third protective layer 3 has the best stab protection but the worst flexibility, and the second protective layer 2 has a relatively balanced ballistic and stab protection performance, with slightly inferior ballistic protection compared to the first protective layer and slightly inferior stab protection compared to the third protective layer, while its flexibility is comparable to the first protective layer 1. To better realize the lightweight characteristics and excellent comfort of the ballistic and stab-proof vest, and considering the general pattern of long-range attacks (bullet impact) followed by close-range attacks (knife stabs), the first protective layer 1 is placed on the outermost layer of the body to initially block bullet penetration damage. Through the synergistic effect of the first and second protective layers 1 and 2, the kinetic energy of the bullet is absorbed and consumed to the maximum extent, preventing further penetration and maximizing the integrity of the third protective layer 3. When facing subsequent knife damage, the third protective layer 3 provides sufficient stab protection to meet the performance requirements of the individual's ballistic and stab protection.

[0010] The first protective layer 1, the second protective layer 2, and the third protective layer 3 are all composed of layers of aramid nonwoven fabric. To achieve different properties, the material and number of layers of aramid nonwoven fabric in each protective layer are different. Specifically:

[0011] The first protective layer 1 comprises 5 to 15 layers of first aramid nonwoven fabric, i.e., N1 = 5 to 15 layers. The first aramid nonwoven fabric is woven from aramid fibers and a first adhesive. Aramid fibers, as a new type of high-tech synthetic fiber, possess excellent properties such as ultra-high strength, high modulus, high temperature resistance, acid and alkali resistance, and light weight. Simultaneously, it is inexpensive and is currently a widely used raw material for bulletproof and stab-resistant vests. Aramid nonwoven fabric is obtained by impregnating and woven aramid fibers with the adhesive. Therefore, the performance of the adhesive largely determines the performance of the aramid nonwoven fabric. To ensure that the first protective layer possesses good ballistic performance and flexibility, the first adhesive includes waterborne polyurethane, 1,4-butanediol, methyltrimethoxysilane, methyltrichlorosilane, melamine, and nano-montmorillonite. Waterborne polyurethane serves as the base component of the first adhesive. The addition of methyltrimethoxysilane and methyltrichlorosilane can modify the waterborne polyurethane adhesive, improve the interfacial characteristics of the bonding between the waterborne polyurethane and aramid fibers, and ensure... The interlayer force of the aramid nonwoven fabric obtained by the woven process is kept at an appropriate value to ensure that the prepared aramid nonwoven fabric has good softness. The addition of melamine can enhance the flame retardant properties of waterborne polyurethane and enhance the protective ability of the first protective layer as the outermost layer. The addition of nano-montmorillonite enhances the impact resistance of the aramid nonwoven fabric and makes it more resistant to bullet penetration. 1,4-Butanediol can improve the compatibility between the components, ensure uniform mixing between the material components, and improve the leveling properties of the first adhesive on the surface of the aramid nonwoven fabric. The prepared aramid nonwoven fabric has better appearance properties.

[0012] Among them, nano-montmorillonite, as an inorganic filler, has poor solubility in waterborne polyurethane and can only be uniformly dispersed in it. When the particle size of nano-montmorillonite is too small, agglomeration will occur, resulting in the prepared aramid nonwoven fabric being unqualified and losing the reinforcing effect of nano-montmorillonite. On the other hand, if the particle size is too large, it will cause the surface of the aramid nonwoven fabric to be uneven, and the reinforcing effect will be weakened. Therefore, the particle size distribution of nano-montmorillonite used in this application is 30-50 nm.

[0013] Further, in the first adhesive, the mass ratio of the waterborne polyurethane, 1,4-butanediol, methyltrimethoxysilane, methyltrichlorosilane, melamine, and nano-montmorillonite is 1000:(60-80):(7-10):(10-15):(8-12):(5-7).

[0014] During the weaving process, the above components are mixed and stirred evenly according to a certain mass ratio to obtain the first adhesive. The first adhesive is then added to the glue box of the loom, and aramid fibers are used for weaving to obtain the first aramid non-woven fabric. The specific process can be carried out according to conventional technical means in this field.

[0015] The second protective layer comprises 10 to 25 layers of a second aramid nonwoven fabric, i.e., N2 = 5 to 15 layers. A second adhesive is used during the weaving process of the second aramid nonwoven fabric. The second adhesive includes waterborne polyurethane, waterborne epoxy resin, methyl methacrylate, ethylene glycol, N-methyldiethanolamine, and titanate coupling agent. Waterborne polyurethane serves as the base component of the second adhesive. The addition of waterborne epoxy resin, methyl methacrylate, and N-methyldiethanolamine optimizes and modifies the waterborne polyurethane. The waterborne epoxy resin enhances the resistance of the aramid nonwoven fabric. In terms of impact properties, N-methyldiethanolamine and methyl methacrylate can improve the flexibility of the second adhesive, further improving the softness of the second aramid nonwoven fabric. At the same time, they ensure that the aramid fibers can be tightly laid out after spreading, and that there is sufficient bonding strength between the second adhesive and the aramid fibers, thus enhancing the puncture resistance of the aramid nonwoven fabric. Ethylene glycol and titanate coupling agents can mix the materials uniformly to the greatest extent, achieving good compatibility and ensuring that the prepared second adhesive has good bulletproof and puncture resistance after being combined with the aramid fibers.

[0016] Further, in the second adhesive, the mass ratio of the waterborne polyurethane, waterborne epoxy resin, methyl methacrylate, ethylene glycol, N-methyldiethanolamine, and titanate coupling agent is 700:(200-250):(100-200):(30-50):(10-30):(3-5).

[0017] The weaving process of the second aramid nonwoven fabric can refer to that of the first aramid nonwoven fabric. The difference is that after the second aramid nonwoven fabric is woven, it needs to be hot-pressed. The hot-pressing temperature is 150-170℃, the pressure is 2-3MPa, and the time is 15-20min. During the hot-pressing process, the second adhesive is heated and then cured a second time, which achieves better adhesion between the adhesive and the fiber, and the fiber is more tightly laid out. It is difficult for the fiber to slip to both sides during the puncture process of the knife, thus achieving better puncture resistance.

[0018] The third protective layer comprises 5 to 12 layers of third aramid nonwoven fabric, i.e., N3 = 5 to 12 layers. A third adhesive is used in the weaving process of the third aramid nonwoven fabric. The third adhesive includes waterborne polyurethane, aminomethyl silicone oil, ammonium polyphosphate, and titanate coupling agent. Waterborne polyurethane serves as the base component of the third adhesive. Aminomethyl silicone oil enhances the flexibility and leveling properties of the third adhesive. Ammonium polyphosphate enhances the flame retardant properties of the aramid nonwoven fabric. The titanate coupling agent activates various materials to ensure uniform mixing among them. Through the synergistic effect between the materials, the puncture resistance of the third aramid nonwoven fabric is further enhanced.

[0019] Furthermore, in the third adhesive, the mass ratio of the waterborne polyurethane, aminomethyl silicone oil, ammonium polyphosphate, and titanate coupling agent is 1000:(70-90):(10-20):(5-8).

[0020] The weaving process of the third aramid nonwoven fabric can be referenced from that of the second aramid nonwoven fabric.

[0021] In the above three types of adhesives, the waterborne polyurethane can be one of the dispersions or emulsions of commercially available polyester polyurethane or polyether polyurethane. Furthermore, the solid content of the waterborne polyurethane is 30-50%. A lower solid content will affect the formulation of the adhesive and reduce production efficiency, while a higher solid content will result in cost losses.

[0022] Considering the protective performance and wearing comfort of the bulletproof and stab-proof vest, the total number of layers of the first aramid nonwoven fabric, the second aramid nonwoven fabric, and the third aramid nonwoven fabric is 20 to 40 layers, that is, N1+N2+N3=20 to 40 layers.

[0023] The buffer layer 4 is located between the protective layer and the protective individual, and is lightweight, soft, and comfortable to wear. It can be made using conventional techniques in the field. Specifically, the buffer layer 4 is a polymer foam board, such as one of ethylene-vinyl acetate copolymer foam board, polyvinyl chloride foam board, or polyethylene terephthalate foam board.

[0024] Furthermore, considering the wearing comfort of bulletproof and stab-resistant vests, the thickness of the cushioning layer is 1 to 3 mm.

[0025] During the preparation process, the first protective layer 1, the second protective layer 2, the third protective layer 3, and the buffer layer 4 are arranged according to... Figure 1 After being assembled in the order shown, the protective chip can be obtained. However, considering the integrity of the protective chip, this application uses heat-sealing cloth to encapsulate each protective layer and buffer layer. Specifically, the protective chip also includes heat-sealing cloth, which wraps and seals the protective chip. The heat-sealing cloth can be obtained using conventional techniques in the field. During the preparation process, the heat-sealing cloth completely wraps each protective layer and buffer layer, and heat-sealing equipment is used to encapsulate the protective layer and buffer layer to achieve a sealing effect.

[0026] In summary, the bulletproof and stab-resistant vest provided in this application has better responsive protective characteristics during bullet penetration or knife puncture. Moreover, the prepared aramid nonwoven fabric has low surface density, smooth appearance, no bubbles, and excellent softness, and can be bent at any angle of 180°. Therefore, the bulletproof and stab-resistant vest provided in this application can reduce the weight of the bulletproof and stab-resistant vest while meeting the protection requirements, and improve the softness and wearing comfort of the bulletproof and stab-resistant vest.

[0027] A second aspect of this application provides a method for preparing any of the bulletproof and stab-resistant vests described above, comprising the following steps:

[0028] A first adhesive is obtained by mixing and stirring waterborne polyurethane, 1,4-butanediol, methyltrimethoxysilane, methyltrichlorosilane, melamine, and nano-montmorillonite. The first adhesive is injected into the glue box of a weaving machine, and a first aramid nonwoven fabric is woven using aramid fibers. Five to 15 layers of the first aramid nonwoven fabric are stacked to obtain a first protective layer.

[0029] A second adhesive is obtained by mixing and stirring waterborne polyurethane, waterborne epoxy resin, methyl methacrylate, ethylene glycol, N-methyldiethanolamine, and titanate coupling agent. The second adhesive is injected into the glue box of a weaving machine, and a second aramid nonwoven fabric is woven using aramid fibers. After hot pressing the second aramid nonwoven fabric, 10 to 25 layers of the second aramid nonwoven fabric are stacked to obtain a second protective layer.

[0030] A third adhesive is obtained by mixing and stirring waterborne polyurethane, aminomethyl silicone oil, ammonium polyphosphate and titanate coupling agent evenly. The third adhesive is injected into the glue box of a weaving machine, and a third aramid nonwoven fabric is woven using aramid fibers. After hot pressing the third aramid nonwoven fabric, 5 to 12 layers of the third aramid nonwoven fabric are stacked to obtain a third protective layer.

[0031] The protective chip is obtained by stacking the first protective layer, the second protective layer, the third protective layer and the buffer layer in sequence. The protective chip is placed inside the outer garment to obtain the bulletproof and stab-proof vest.

[0032] In one specific embodiment, an adhesive is first prepared. During the adhesive preparation process, the materials used are as described above, and the mixing process can be carried out in two steps, specifically:

[0033] In the preparation of the first adhesive, waterborne polyurethane, 1,4-butanediol, methyltrimethoxysilane, and methyltrichlorosilane are first mixed according to the above mass ratio and stirred evenly by mechanical stirring. During the stirring process, the speed is set to 500-700 r / min and the stirring time is 30-50 min. After stirring, melamine and nano-montmorillonite are added, and mechanical stirring is continued. The speed is set to 800-1000 r / min and the stirring time is 100-120 min. After stirring, the first adhesive is obtained.

[0034] In the preparation of the second adhesive, ethylene glycol, N-methyldiethanolamine, and titanate coupling agent are first mixed according to the above mass ratio, and waterborne polyurethane, waterborne epoxy resin, and methyl methacrylate are mixed according to the above mass ratio. Then, the two mixed solutions are mixed and mechanically stirred. The stirring speed is set to 800-1000 r / min and the stirring time is 60-90 min. After stirring, the second adhesive is obtained.

[0035] In the preparation of the third adhesive, waterborne polyurethane, aminomethyl silicone oil, and titanate coupling agent are first mixed according to the above mass ratio and mechanically stirred at a speed of 300-500 r / min for 10-20 min. After stirring, ammonium polyphosphate is added and mechanical stirring is continued at a speed of 800-1000 r / min for 50-80 min. The third adhesive is obtained after stirring.

[0036] The above preparation method ensures uniform mixing of all materials, achieving excellent modification of waterborne polyurethane and enabling the prepared adhesive to bond well with aramid fibers, thus achieving excellent protective performance.

[0037] Next, the prepared first adhesive, second adhesive, and third adhesive are added to the glue box of the loom, and the first aramid nonwoven fabric, the second aramid nonwoven fabric, and the third aramid nonwoven fabric are prepared by using aramid fibers with different adhesives. Subsequently, the first aramid nonwoven fabric, the second aramid nonwoven fabric, and the third aramid nonwoven fabric can be cut to suit the wearing requirements of protective individuals.

[0038] After cutting, the second and third aramid nonwoven fabrics need to be hot-pressed to allow the second and third adhesives to cure for a second time, so as to achieve better adhesion between the adhesive and the fiber and improve the puncture resistance. Specifically, the hot-pressing temperature is 150-170℃, the pressure is 2-3MPa, and the time is 15-20min.

[0039] Finally, in accordance with the layer requirements provided in the first aspect of this application, the first aramid nonwoven fabric, the second aramid nonwoven fabric, and the third aramid nonwoven fabric are stacked to obtain the first protective layer, the second protective layer, and the third protective layer. Subsequently, with the addition of a buffer layer, the first protective layer, the second protective layer, the third protective layer, and the buffer layer are stacked sequentially to obtain the protective chip.

[0040] In addition, the protective chip can be sealed. Specifically, the stacked protective chip is wrapped in heat-sealed fabric and then heat-sealed, so that the protective chip is sealed inside the heat-sealed fabric. Finally, the sealed protective chip is placed inside the outer garment to obtain a bulletproof and stab-proof vest.

[0041] The preparation method provided in this application uses low-cost raw materials, has a simple preparation process, requires no modification to the original production equipment, and only requires changing the adhesive. It is suitable for industrial assembly line operation, and does not generate pollutants such as waste during the preparation process, meeting the requirements of green and environmentally friendly production, and has significant economic and social benefits.

[0042] The implementation of this application has at least the following advantages:

[0043] 1. The bulletproof and stab-proof vest provided in this application has better response protection characteristics during bullet penetration or knife puncture. Moreover, the prepared aramid non-woven fabric has low surface density, smooth appearance, no bubbles, and excellent softness, and can be bent at any angle of 180°. Therefore, the bulletproof and stab-proof vest provided in this application can reduce the weight of the bulletproof and stab-proof vest while meeting the protection requirements, and improve the softness and wearing comfort of the bulletproof and stab-proof vest.

[0044] 2. The preparation method provided in this application uses low-cost raw materials, has a simple preparation process, does not require modification of the original production equipment, and only requires changing the adhesive. It is suitable for industrial assembly line operation, and does not generate pollutants such as waste during the preparation process, meeting the requirements of green and environmentally friendly production, and has significant economic and social benefits. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the structure of a protective chip provided in one embodiment of this application.

[0047] Explanation of reference numerals in the attached figures:

[0048] 1-First protective layer;

[0049] 2-Second protective layer;

[0050] 3-Third protective layer;

[0051] 4-Buffer layer. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] The materials used in the following examples are all commercially available products. Specific information is shown in Table 1:

[0054] Table 1 Raw Material Information

[0055] Serial Number raw material factory 1 Aramid fiber Akzo Netherlands 2 Waterborne polyurethane Wanhua Chemical Group Co., Ltd. 3 1,4-Butanediol Shanghai McLean Biochemical Technology Co., Ltd. 4 Methyltrimethoxysilane Shanghai McLean Biochemical Technology Co., Ltd. 5 Methyltrichlorosilane Shanghai McLean Biochemical Technology Co., Ltd. 6 melamine Weixing Chemical Co., Ltd. 7 Nano-montmorillonite Jiangxi Gukang New Materials Co., Ltd. 8 Methyl methacrylate Shanghai McLean Biochemical Technology Co., Ltd. 9 Ethylene glycol Shanghai McLean Biochemical Technology Co., Ltd. 10 N-Methyldiethanolamine Shanghai McLean Biochemical Technology Co., Ltd. 11 titanate coupling agent Changsha Ross Technology Co., Ltd. 12 Aminomethyl silicone oil Shanghai McLean Biochemical Technology Co., Ltd. 13 Ammonium polyphosphate Changfeng Chemical Co., Ltd.

[0056] Example 1

[0057] The method for preparing the bulletproof and stab-resistant vest provided in this embodiment includes the following steps:

[0058] Step 1: Mix 2000 parts of waterborne polyurethane, 150 parts of 1,4-butanediol, 16 parts of methyltrimethoxysilane, and 28 parts of methyltrichlorosilane, and mechanically stir at 650 r / min for 34 min. Then add 21 parts of melamine and 13 parts of nano-montmorillonite, and continue mechanically stirring at 960 r / min for 105 min to obtain the first adhesive.

[0059] Mix 80 parts of ethylene glycol, 35 parts of N-methyldiethanolamine, and 8 parts of titanate coupling agent, and mechanically stir at 220 r / min for 18 min. Mix 1400 parts of waterborne polyurethane, 420 parts of waterborne epoxy resin, and 370 parts of methyl methacrylate. After mixing the two mixtures, continue mechanical stirring at 830 r / min for 80 min to obtain the second adhesive.

[0060] 2000 parts of waterborne polyurethane, 170 parts of aminomethyl silicone oil, and 12 parts of titanate coupling agent were mixed and mechanically stirred at 430 r / min for 16 min. Then, 38 parts of ammonium polyphosphate were added and mechanical stirring was continued at 860 r / min for 75 min to obtain the third adhesive.

[0061] Step 2: Inject the first adhesive, the second adhesive, and the third adhesive into the glue box of the loom, and use aramid fibers to weave nonwoven fabric to obtain the first aramid nonwoven fabric, the second aramid nonwoven fabric, and the third aramid nonwoven fabric.

[0062] The first aramid nonwoven fabric, the second aramid nonwoven fabric, the third aramid nonwoven fabric and the 2mm PVC cushioning foam board were cut using a fully automatic cutting machine. Then the second aramid nonwoven fabric and the third aramid nonwoven fabric were hot-pressed respectively. The hot-pressing temperature was 165℃, the pressure was 2.2MPa, and the hot-pressing time was 18min.

[0063] Step 3: Stack and combine 5 layers of first aramid nonwoven fabric, 12 layers of second aramid nonwoven fabric, and 6 layers of third aramid nonwoven fabric to obtain the first protective layer, the second protective layer, and the third protective chip layer. Stack them in the order of first protective layer → second protective layer → third protective layer → buffer layer to obtain the protective chip core.

[0064] The protective chip core is sealed by using heat-sealing cloth, and the side of the heat-sealing cloth that is in close contact with the buffer layer is marked as the "body-contact side", thus obtaining the protective chip.

[0065] Step 4: Insert the protective chip into the jacket, ensuring that the side that touches the body is on the inside, and you will have a bulletproof and stab-proof vest.

[0066] Example 2

[0067] The method for preparing the bulletproof and stab-resistant vest provided in this embodiment includes the following steps:

[0068] Step 1: Mix 1500 parts of waterborne polyurethane, 100 parts of 1,4-butanediol, 12 parts of methyltrimethoxysilane, and 20 parts of methyltrichlorosilane, and stir mechanically at 520 r / min. After 45 min, add 15 parts of melamine and 9 parts of nano-montmorillonite, and continue stirring mechanically at 880 r / min. After 120 min, the first adhesive is obtained.

[0069] 65 parts of ethylene glycol, 42 parts of N-methyldiethanolamine, and 6 parts of titanate coupling agent were mixed and mechanically stirred at 260 r / min for 14 min. 1050 parts of waterborne polyurethane, 350 parts of waterborne epoxy resin, and 200 parts of methyl methacrylate were mixed. The two mixtures were then mixed and mechanically stirred at 910 r / min for 75 min to obtain the second adhesive.

[0070] 1500 parts of waterborne polyurethane, 110 parts of aminomethyl silicone oil, and 9 parts of titanate coupling agent were mixed and mechanically stirred at 380 r / min. After 18 min, 22 parts of ammonium polyphosphate were added and mechanical stirring was continued at 1000 r / min. After 55 min, the third adhesive was obtained.

[0071] The first adhesive, the second adhesive, and the third adhesive are injected into the glue box of the loom, and aramid fibers are used to weave nonwoven fabric to obtain the first aramid nonwoven fabric, the second aramid nonwoven fabric, and the third aramid nonwoven fabric.

[0072] The first aramid nonwoven fabric, the second aramid nonwoven fabric, the third aramid nonwoven fabric and the 3mm EVA cushioning foam board were cut using a fully automatic cutting machine. Then the second aramid nonwoven fabric and the third aramid nonwoven fabric were hot-pressed respectively. The hot-pressing temperature was 155℃, the pressure was 2.5MPa, and the hot-pressing time was 16min.

[0073] Step 3: Stack and combine 7 layers of first aramid nonwoven fabric, 16 layers of second aramid nonwoven fabric, and 5 layers of third aramid nonwoven fabric to obtain the first protective layer, the second protective layer, and the third protective chip layer. Stack them in the order of first protective layer → second protective layer → third protective layer → buffer layer to obtain the protective chip core.

[0074] The protective chip core is sealed by using heat-sealing cloth, and the side of the heat-sealing cloth that is in close contact with the buffer layer is marked as the "body-contact side", thus obtaining the protective chip.

[0075] Step 4: Insert the protective chip into the jacket, ensuring that the side that touches the body is on the inside, and you will have a bulletproof and stab-proof vest.

[0076] Example 3

[0077] The method for preparing the bulletproof and stab-resistant vest provided in this embodiment includes the following steps:

[0078] Step 1: Mix 3000 parts of waterborne polyurethane, 190 parts of 1,4-butanediol, 27 parts of methyltrimethoxysilane, and 41 parts of methyltrichlorosilane, and mechanically stir at 580 r / min. After 42 min, add 35 parts of melamine and 17 parts of nano-montmorillonite, and continue mechanical stirring at 900 r / min. After 115 min, the first adhesive is obtained.

[0079] 120 parts of ethylene glycol, 65 parts of N-methyldiethanolamine, and 13 parts of titanate coupling agent were mixed and mechanically stirred at 240 rpm for 16 min. 2100 parts of waterborne polyurethane, 680 parts of waterborne epoxy resin, and 430 parts of methyl methacrylate were mixed. The two mixtures were then combined and mechanically stirred at 870 rpm for 85 min to obtain the second adhesive.

[0080] 3000 parts of waterborne polyurethane, 240 parts of aminomethyl silicone oil, and 18 parts of titanate coupling agent were mixed and mechanically stirred at 460 r / min for 15 min. Then, 53 parts of ammonium polyphosphate were added and mechanical stirring was continued at 940 r / min for 68 min to obtain the third adhesive.

[0081] Step 2: Inject the first adhesive, the second adhesive, and the third adhesive into the glue box of the loom, and use aramid fibers to weave nonwoven fabric to obtain the first aramid nonwoven fabric, the second aramid nonwoven fabric, and the third aramid nonwoven fabric.

[0082] The first aramid nonwoven fabric, the second aramid nonwoven fabric, the third aramid nonwoven fabric and the 1mm PET cushioning foam board were cut using a fully automatic cutting machine. Then the second aramid nonwoven fabric and the third aramid nonwoven fabric were hot-pressed respectively. The hot-pressing temperature was 160℃, the pressure was 2.4MPa, and the hot-pressing time was 17min.

[0083] Step 3: Stack and combine 12 layers of first aramid nonwoven fabric, 15 layers of second aramid nonwoven fabric, and 10 layers of third aramid nonwoven fabric to obtain the first protective layer, the second protective layer, and the third protective chip layer. Stack them in the order of first protective layer → second protective layer → third protective layer → buffer layer to obtain the inner core of the protective chip.

[0084] The protective chip core is sealed by using heat-sealing cloth, and the side of the heat-sealing cloth that is in close contact with the buffer layer is marked as the "body-contact side", thus obtaining the protective chip.

[0085] Step 4: Insert the protective chip into the jacket, ensuring that the side that touches the body is on the inside, and you will have a bulletproof and stab-proof vest.

[0086] Example 4

[0087] The method for preparing the bulletproof and stab-resistant vest provided in this embodiment includes the following steps:

[0088] Step 1: Mix 2200 parts of waterborne polyurethane, 170 parts of 1,4-butanediol, 18 parts of methyltrimethoxysilane, and 27 parts of methyltrichlorosilane, and mechanically stir at 670 r / min for 35 min. Then add 19 parts of melamine and 14 parts of nano-montmorillonite, and continue mechanical stirring at 950 r / min for 110 min to obtain the second adhesive.

[0089] 90 parts of ethylene glycol, 58 parts of N-methyldiethanolamine, and 9 parts of titanate coupling agent were mixed and mechanically stirred at 250 r / min for 15 min. 1540 parts of waterborne polyurethane, 520 parts of waterborne epoxy resin, and 350 parts of methyl methacrylate were mixed. The two mixtures were then mixed and mechanically stirred at 930 r / min for 70 min to obtain the second adhesive.

[0090] 2200 parts of waterborne polyurethane, 165 parts of aminomethyl silicone oil, and 15 parts of titanate coupling agent were mixed and mechanically stirred at 420 r / min for 13 min. Then, 37 parts of ammonium polyphosphate were added and mechanical stirring was continued at 980 r / min for 76 min to obtain the third resin adhesive.

[0091] Step 2: Inject the first adhesive, the second adhesive, and the third adhesive into the glue box of the loom, and use aramid fibers to weave nonwoven fabric to obtain the first aramid nonwoven fabric, the second aramid nonwoven fabric, and the third aramid nonwoven fabric.

[0092] The first aramid nonwoven fabric, the second aramid nonwoven fabric, the third aramid nonwoven fabric and the 2mm EVA cushioning foam board were cut using a fully automatic cutting machine. Then the second aramid nonwoven fabric and the third aramid nonwoven fabric were hot-pressed respectively. The hot-pressing temperature was 150℃, the pressure was 2.7MPa, and the hot-pressing time was 15min.

[0093] Step 3: Stack and combine 6 layers of first aramid nonwoven fabric, 17 layers of second aramid nonwoven fabric, and 7 layers of third aramid nonwoven fabric to obtain the first protective layer, the second protective layer, and the third protective chip layer. Stack them in the order of first protective layer → second protective layer → third protective layer → buffer layer to obtain the protective chip core.

[0094] The protective chip core is sealed by using heat-sealing cloth, and the side of the heat-sealing cloth that is in close contact with the buffer layer is marked as the "body-contact side", thus obtaining the protective chip.

[0095] Step 4: Insert the protective chip into the jacket, ensuring that the side that touches the body is on the inside, and you will have a bulletproof and stab-proof vest.

[0096] Example 5

[0097] The method for preparing the bulletproof and stab-resistant vest provided in this embodiment includes the following steps:

[0098] Step 1: Mix 2500 parts of waterborne polyurethane, 180 parts of 1,4-butanediol, 23 parts of methyltrimethoxysilane, and 36 parts of methyltrichlorosilane, and mechanically stir at 600 r / min for 40 min. Then add 26 parts of melamine and 15 parts of nano-montmorillonite, and continue mechanically stirring at 920 r / min for 100 min to obtain the first adhesive.

[0099] 100 parts of ethylene glycol, 60 parts of N-methyldiethanolamine, and 11 parts of titanate coupling agent were mixed and mechanically stirred at 280 r / min for 12 min. 1750 parts of waterborne polyurethane, 570 parts of waterborne epoxy resin, and 460 parts of methyl methacrylate were mixed. The two mixtures were then mixed and mechanically stirred at 970 r / min for 65 min to obtain the second adhesive.

[0100] 2500 parts of waterborne polyurethane, 180 parts of aminomethyl silicone oil, and 20 parts of titanate coupling agent were mixed and mechanically stirred at 350 r / min for 20 min. Then, 45 parts of ammonium polyphosphate were added and mechanically stirred at 890 r / min for 70 min to obtain the third adhesive.

[0101] Step 2: Inject the first adhesive, the second adhesive, and the third adhesive into the glue box of the loom, and use aramid fibers to weave nonwoven fabric to obtain the first aramid nonwoven fabric, the second aramid nonwoven fabric, and the third aramid nonwoven fabric.

[0102] The first aramid nonwoven fabric, the second aramid nonwoven fabric, the third aramid nonwoven fabric and the 3mm PVC cushioning foam board were cut using a fully automatic cutting machine. Then the second aramid nonwoven fabric and the third aramid nonwoven fabric were hot-pressed at a temperature of 170℃ and a pressure of 2.3MPa for 20 minutes.

[0103] Step 3: Stack and combine 8 layers of first aramid nonwoven fabric, 20 layers of second aramid nonwoven fabric, and 7 layers of third aramid nonwoven fabric to obtain the first protective layer, the second protective layer, and the third protective chip layer. Stack them in the order of first protective layer → second protective layer → third protective layer → buffer layer to obtain the protective chip core.

[0104] The protective chip core is sealed by using heat-sealing cloth, and the side of the heat-sealing cloth that is in close contact with the buffer layer is marked as the "body-contact side", thus obtaining the protective chip.

[0105] Step 4: Insert the protective chip into the jacket, ensuring that the side that touches the body is on the inside, and you will have a bulletproof and stab-proof vest.

[0106] Compare with Example 1

[0107] The method for preparing the bulletproof and stab-resistant vest provided in this comparative example includes the following steps:

[0108] Step 1: Mix 2000 parts of waterborne polyurethane, 150 parts of 1,4-butanediol, 16 parts of methyltrimethoxysilane and 28 parts of methyltrichlorosilane, and mechanically stir at 650 r / min for 34 min to obtain the first adhesive.

[0109] Mix 80 parts of ethylene glycol, 35 parts of N-methyldiethanolamine, and 8 parts of titanate coupling agent, and mechanically stir at 220 r / min for 18 min. Mix 1400 parts of waterborne polyurethane, 420 parts of waterborne epoxy resin, and 370 parts of methyl methacrylate. After mixing the two mixtures, continue mechanical stirring at 830 r / min for 80 min to obtain the second adhesive.

[0110] 2000 parts of waterborne polyurethane, 170 parts of aminomethyl silicone oil, and 12 parts of titanate coupling agent were mixed and mechanically stirred at 430 r / min for 16 min. Then, 38 parts of ammonium polyphosphate were added and mechanical stirring was continued at 860 r / min for 75 min to obtain the third adhesive.

[0111] Step 2: Inject the first adhesive, the second adhesive, and the third adhesive into the glue box of the loom, and use aramid fibers to weave nonwoven fabric to obtain the first aramid nonwoven fabric, the second aramid nonwoven fabric, and the third aramid nonwoven fabric.

[0112] The first aramid nonwoven fabric, the second aramid nonwoven fabric, the third aramid nonwoven fabric and the 2mm PVC cushioning foam board were cut using a fully automatic cutting machine. Then the second aramid nonwoven fabric and the third aramid nonwoven fabric were hot-pressed respectively. The hot-pressing temperature was 165℃, the pressure was 2.2MPa, and the hot-pressing time was 18min.

[0113] Step 3: Stack and combine 5 layers of first aramid nonwoven fabric, 12 layers of second aramid nonwoven fabric, and 6 layers of third aramid nonwoven fabric to obtain the first protective layer, the second protective layer, and the third protective chip layer. Stack them in the order of first protective layer → second protective layer → third protective layer → buffer layer to obtain the protective chip core.

[0114] The protective chip core is sealed by using heat-sealing cloth, and the side of the heat-sealing cloth that is in close contact with the buffer layer is marked as the "body-contact side", thus obtaining the protective chip.

[0115] Step 4: Insert the protective chip into the jacket, ensuring that the side that touches the body is on the inside, and you will have a bulletproof and stab-proof vest.

[0116] Compare with Example 2

[0117] The method for preparing the bulletproof and stab-resistant vest provided in this comparative example includes the following steps:

[0118] Step 1: Mix 1500 parts of waterborne polyurethane, 100 parts of 1,4-butanediol, 12 parts of methyltrimethoxysilane, and 20 parts of methyltrichlorosilane, and stir mechanically at 520 r / min. After 45 min, add 15 parts of melamine and 9 parts of nano-montmorillonite, and continue stirring mechanically at 880 r / min. After 120 min, the first adhesive is obtained.

[0119] 65 parts of ethylene glycol, 42 parts of N-methyldiethanolamine, and 6 parts of titanate coupling agent were mixed and mechanically stirred at 260 r / min for 14 min. 1050 parts of waterborne polyurethane and 200 parts of methyl methacrylate were mixed. The two mixtures were then mixed and mechanically stirred at 910 r / min for 75 min to obtain the second adhesive.

[0120] 1500 parts of waterborne polyurethane, 110 parts of aminomethyl silicone oil, and 9 parts of titanate coupling agent were mixed and mechanically stirred at 380 r / min. After 18 min, 22 parts of ammonium polyphosphate were added and mechanical stirring was continued at 1000 r / min. After 55 min, the third adhesive was obtained.

[0121] The first adhesive, the second adhesive, and the third adhesive are injected into the glue box of the loom, and aramid fibers are used to weave nonwoven fabric to obtain the first aramid nonwoven fabric, the second aramid nonwoven fabric, and the third aramid nonwoven fabric.

[0122] The first aramid nonwoven fabric, the second aramid nonwoven fabric, the third aramid nonwoven fabric and the 3mm EVA cushioning foam board were cut using a fully automatic cutting machine. Then the second aramid nonwoven fabric and the third aramid nonwoven fabric were hot-pressed respectively. The hot-pressing temperature was 155℃, the pressure was 2.5MPa, and the hot-pressing time was 16min.

[0123] Step 3: Stack and combine 7 layers of first aramid nonwoven fabric, 16 layers of second aramid nonwoven fabric, and 5 layers of third aramid nonwoven fabric to obtain the first protective layer, the second protective layer, and the third protective chip layer. Stack them in the order of first protective layer → second protective layer → third protective layer → buffer layer to obtain the protective chip core.

[0124] The protective chip core is sealed by using heat-sealing cloth, and the side of the heat-sealing cloth that is in close contact with the buffer layer is marked as the "body-contact side", thus obtaining the protective chip.

[0125] Step 4: Insert the protective chip into the jacket, ensuring that the side that touches the body is on the inside, and you will have a bulletproof and stab-proof vest.

[0126] Compare with Example 3

[0127] The method for preparing the bulletproof and stab-resistant vest provided in this comparative example includes the following steps:

[0128] Step 1: Mix 3000 parts of waterborne polyurethane, 190 parts of 1,4-butanediol, 27 parts of methyltrimethoxysilane, and 41 parts of methyltrichlorosilane, and mechanically stir at 580 r / min. After 42 min, add 35 parts of melamine and 17 parts of nano-montmorillonite, and continue mechanical stirring at 900 r / min. After 115 min, the first adhesive is obtained.

[0129] 120 parts of ethylene glycol, 65 parts of N-methyldiethanolamine, and 13 parts of titanate coupling agent were mixed and mechanically stirred at 240 rpm for 16 min. 2100 parts of waterborne polyurethane, 680 parts of waterborne epoxy resin, and 430 parts of methyl methacrylate were mixed. The two mixtures were then combined and mechanically stirred at 870 rpm for 85 min to obtain the second adhesive.

[0130] 3000 parts of waterborne polyurethane and 53 parts of ammonium polyphosphate were mixed and mechanically stirred at 940 r / min for 68 min to obtain the third adhesive.

[0131] Step 2: Inject the first adhesive, the second adhesive, and the third adhesive into the glue box of the loom, and use aramid fibers to weave nonwoven fabric to obtain the first aramid nonwoven fabric, the second aramid nonwoven fabric, and the third aramid nonwoven fabric.

[0132] The first aramid nonwoven fabric, the second aramid nonwoven fabric, the third aramid nonwoven fabric and the 1mm PET cushioning foam board were cut using a fully automatic cutting machine. Then the second aramid nonwoven fabric and the third aramid nonwoven fabric were hot-pressed respectively. The hot-pressing temperature was 160℃, the pressure was 2.4MPa, and the hot-pressing time was 17min.

[0133] Step 3: Stack and combine 12 layers of first aramid nonwoven fabric, 15 layers of second aramid nonwoven fabric, and 10 layers of third aramid nonwoven fabric to obtain the first protective layer, the second protective layer, and the third protective chip layer. Stack them in the order of first protective layer → second protective layer → third protective layer → buffer layer to obtain the inner core of the protective chip.

[0134] The protective chip core is sealed by using heat-sealing cloth, and the side of the heat-sealing cloth that is in close contact with the buffer layer is marked as the "body-contact side", thus obtaining the protective chip.

[0135] Step 4: Insert the protective chip into the jacket, ensuring that the side that touches the body is on the inside, and you will have a bulletproof and stab-proof vest.

[0136] Compare with Example 4

[0137] The method for preparing the bulletproof and stab-resistant vest provided in this comparative example includes the following steps:

[0138] Step 1: Mix 2200 parts of waterborne polyurethane, 170 parts of 1,4-butanediol, 18 parts of methyltrimethoxysilane, and 27 parts of methyltrichlorosilane, and mechanically stir at 670 r / min for 35 min. Then add 19 parts of melamine and 14 parts of nano-montmorillonite, and continue mechanical stirring at 950 r / min for 110 min to obtain the second adhesive.

[0139] 90 parts of ethylene glycol, 58 parts of N-methyldiethanolamine, and 9 parts of titanate coupling agent were mixed and mechanically stirred at 250 r / min for 15 min. 1540 parts of waterborne polyurethane, 520 parts of waterborne epoxy resin, and 350 parts of methyl methacrylate were mixed. The two mixtures were then mixed and mechanically stirred at 930 r / min for 70 min to obtain the second adhesive.

[0140] 2200 parts of waterborne polyurethane, 165 parts of aminomethyl silicone oil, and 15 parts of titanate coupling agent were mixed and mechanically stirred at 420 r / min for 13 min. Then, 37 parts of ammonium polyphosphate were added and mechanical stirring was continued at 980 r / min for 76 min to obtain the third resin adhesive.

[0141] Step 2: Inject the first adhesive, the second adhesive, and the third adhesive into the glue box of the loom, and use aramid fibers to weave nonwoven fabric to obtain the first aramid nonwoven fabric, the second aramid nonwoven fabric, and the third aramid nonwoven fabric.

[0142] The first aramid nonwoven fabric, the second aramid nonwoven fabric, the third aramid nonwoven fabric and the 2mm EVA cushioning foam board were cut using a fully automatic cutting machine. Then the second aramid nonwoven fabric and the third aramid nonwoven fabric were hot-pressed respectively. The hot-pressing temperature was 150℃, the pressure was 2.7MPa, and the hot-pressing time was 15min.

[0143] Step 3: Stack and combine 2 layers of first aramid nonwoven fabric, 25 layers of second aramid nonwoven fabric, and 3 layers of third aramid nonwoven fabric to obtain the first protective layer, the second protective layer, and the third protective chip layer. Stack them in the order of first protective layer → second protective layer → third protective layer → buffer layer to obtain the protective chip core.

[0144] The protective chip core is sealed by using heat-sealing cloth, and the side of the heat-sealing cloth that is in close contact with the buffer layer is marked as the "body-contact side", thus obtaining the protective chip.

[0145] Step 4: Insert the protective chip into the jacket, ensuring that the side that touches the body is on the inside, and you will have a bulletproof and stab-proof vest.

[0146] Compare with Example 5

[0147] The method for preparing the bulletproof and stab-resistant vest provided in this comparative example includes the following steps:

[0148] Step 1: Mix 2500 parts of waterborne polyurethane, 180 parts of 1,4-butanediol, 23 parts of methyltrimethoxysilane, and 36 parts of methyltrichlorosilane, and mechanically stir at 600 r / min for 40 min. Then add 26 parts of melamine and 15 parts of nano-montmorillonite, and continue mechanically stirring at 920 r / min for 100 min to obtain the first adhesive.

[0149] 100 parts of ethylene glycol, 60 parts of N-methyldiethanolamine, and 11 parts of titanate coupling agent were mixed and mechanically stirred at 280 r / min for 12 min. 1750 parts of waterborne polyurethane, 570 parts of waterborne epoxy resin, and 460 parts of methyl methacrylate were mixed. The two mixtures were then mixed and mechanically stirred at 970 r / min for 65 min to obtain the second adhesive.

[0150] 2500 parts of waterborne polyurethane, 180 parts of aminomethyl silicone oil, and 20 parts of titanate coupling agent were mixed and mechanically stirred at 350 r / min for 20 min. Then, 45 parts of ammonium polyphosphate were added and mechanically stirred at 890 r / min for 70 min to obtain the third adhesive.

[0151] Step 2: Inject the first adhesive, the second adhesive, and the third adhesive into the glue box of the loom, and use aramid fibers to weave nonwoven fabric to obtain the first aramid nonwoven fabric, the second aramid nonwoven fabric, and the third aramid nonwoven fabric.

[0152] The first aramid nonwoven fabric, the second aramid nonwoven fabric, the third aramid nonwoven fabric and the 3mm PVC cushioning foam board were cut using a fully automatic cutting machine. Then the second aramid nonwoven fabric and the third aramid nonwoven fabric were hot-pressed at a temperature of 100℃ and a pressure of 4MPa for 20 minutes.

[0153] Step 3: Stack and combine 8 layers of first aramid nonwoven fabric, 20 layers of second aramid nonwoven fabric, and 7 layers of third aramid nonwoven fabric to obtain the first protective layer, the second protective layer, and the third protective chip layer. Stack them in the order of first protective layer → second protective layer → third protective layer → buffer layer to obtain the protective chip core.

[0154] The protective chip core is sealed by using heat-sealing cloth, and the side of the heat-sealing cloth that is in close contact with the buffer layer is marked as the "body-contact side", thus obtaining the protective chip.

[0155] Step 4: Insert the protective chip into the jacket, ensuring that the side that touches the body is on the inside, and you will have a bulletproof and stab-proof vest.

[0156] Compare with Example 6

[0157] The method for preparing the bulletproof and stab-resistant vest provided in this comparative example includes the following steps:

[0158] Step 1: Mix 2500 parts of waterborne polyurethane, 180 parts of 1,4-butanediol, 23 parts of methyltrimethoxysilane, and 36 parts of methyltrichlorosilane, and mechanically stir at 600 r / min for 40 min. Then add 26 parts of melamine and 15 parts of nano-montmorillonite, and continue mechanically stirring at 920 r / min for 100 min to obtain the first adhesive.

[0159] 100 parts of ethylene glycol, 60 parts of N-methyldiethanolamine, and 11 parts of titanate coupling agent were mixed and mechanically stirred at 280 r / min for 12 min. 1750 parts of waterborne polyurethane, 570 parts of waterborne epoxy resin, and 460 parts of methyl methacrylate were mixed. The two mixtures were then mixed and mechanically stirred at 970 r / min for 65 min to obtain the second adhesive.

[0160] 2500 parts of waterborne polyurethane, 180 parts of aminomethyl silicone oil, and 20 parts of titanate coupling agent were mixed and mechanically stirred at 350 r / min for 20 min. Then, 45 parts of ammonium polyphosphate were added and mechanically stirred at 890 r / min for 70 min to obtain the third adhesive.

[0161] Step 2: Inject the first adhesive, the second adhesive, and the third adhesive into the glue box of the loom, and use aramid fibers to weave nonwoven fabric to obtain the first aramid nonwoven fabric, the second aramid nonwoven fabric, and the third aramid nonwoven fabric.

[0162] The first aramid nonwoven fabric, the second aramid nonwoven fabric, the third aramid nonwoven fabric and the 3mm PVC cushioning foam board were cut using a fully automatic cutting machine. Then the second aramid nonwoven fabric and the third aramid nonwoven fabric were hot-pressed at a temperature of 190℃ and a pressure of 2.6MPa for 20 minutes.

[0163] Step 3: Stack and combine 8 layers of first aramid nonwoven fabric, 20 layers of second aramid nonwoven fabric, and 7 layers of third aramid nonwoven fabric to obtain the first protective layer, the second protective layer, and the third protective chip layer. Stack them in the order of first protective layer → second protective layer → third protective layer → buffer layer to obtain the protective chip core.

[0164] The protective chip core is sealed by using heat-sealing cloth, and the side of the heat-sealing cloth that is in close contact with the buffer layer is marked as the "body-contact side", thus obtaining the protective chip.

[0165] Step 4: Insert the protective chip into the jacket, ensuring that the side that touches the body is on the inside, and you will have a bulletproof and stab-proof vest.

[0166] Note: Unless otherwise specified, the first aramid nonwoven fabric, the second aramid nonwoven fabric, the third aramid nonwoven fabric and the cushioning foam board in the above embodiments are all cut to size M of the KL pattern.

[0167] The bulletproof and stab-resistant vests provided in Examples 1-5 and Comparative Examples 1-6 were subjected to stab and ballistic performance tests. The stab resistance test was conducted strictly in accordance with the U.S. Department of Justice NIJ 0115.00 Protection Level 1 stab resistance test standard, with a knife impact energy of 24J (17.7ft-1bf). The ballistic performance test was conducted strictly in accordance with the U.S. Department of Justice NIJ 0101.06 IIIA ballistic test standard, using a caliber 15.6g Magnum semi-armored hollow-point bullet (.44). The test results are shown in Table 2.

[0168] Table 2 shows the performance test results of the bulletproof and stab-resistant vests provided in Examples 1-5 and Comparative Examples 1-6.

[0169]

[0170] Note: - indicates that the sample's ballistic performance test showed penetration, making it impossible to calculate the dent value.

[0171] As shown in Table 2, the ballistic and stab-resistant vest provided in this application has a low surface density and good softness. At the same time, its stab resistance performance meets the U.S. Department of Justice NIJ 0115.00 Protection Level 1 stab resistance test standard, and its ballistic resistance performance meets the U.S. Department of Justice NIJ0101.06 Level IIIA ballistic resistance test standard. Both of these performances are superior to the standards and international market requirements. While meeting the ballistic and stab resistance performance requirements, the vest achieves lightweight and softness, which helps to improve wearing comfort.

[0172] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A lightweight and comfortable bulletproof and stab-resistant vest, wherein, The bulletproof and stab-proof vest includes an outer jacket and a protective chip disposed inside the outer jacket. The protective chip includes a first protective layer, a second protective layer, a third protective layer, and a buffer layer stacked in sequence. The first protective layer comprises 5 to 15 layers of first aramid nonwoven fabric, which is woven from aramid fibers and a first adhesive. The first adhesive includes waterborne polyurethane, 1,4-butanediol, methyltrimethoxysilane, methyltrichlorosilane, melamine and nano-montmorillonite. The second protective layer comprises 10 to 25 layers of second aramid nonwoven fabric, which is woven from aramid fibers and a second adhesive. The second adhesive includes waterborne polyurethane, waterborne epoxy resin, methyl methacrylate, ethylene glycol, N-methyldiethanolamine and titanate coupling agent. The third protective layer comprises 5 to 12 layers of third aramid nonwoven fabric, which is woven from aramid fibers and a third adhesive. The third adhesive includes waterborne polyurethane, aminomethyl silicone oil, ammonium polyphosphate and titanate coupling agent. In the first adhesive, the mass ratio of waterborne polyurethane, 1,4-butanediol, methyltrimethoxysilane, methyltrichlorosilane, cyanuric acid, and nano-montmorillonite is 1000:(60~80):(7~10):(10~15):(8~12):(5~7). The second and third aramid nonwoven fabrics are hot-pressed respectively, with the hot-pressing temperature being 150~170 ℃ and the pressure being 2~3 MPa.

2. The bulletproof and stab-resistant vest according to claim 1, wherein, In the second adhesive, the mass ratio of the waterborne polyurethane, waterborne epoxy resin, methyl methacrylate, ethylene glycol, N-methyldiethanolamine, and titanate coupling agent is 700:(200~250):(100~200):(30~50):(10~30):(3~5).

3. The bulletproof and stab-resistant vest according to claim 1, wherein, In the third adhesive, the mass ratio of the waterborne polyurethane, aminomethyl silicone oil, ammonium polyphosphate, and titanate coupling agent is 1000:(70~90):(10~20):(5~8).

4. The bulletproof and stab-resistant vest according to claim 1, wherein, The solid content of the waterborne polyurethane is 30-50%.

5. The bulletproof and stab-resistant vest according to claim 1, wherein, The particle size distribution of the nano-montmorillonite is 30~50 nm.

6. The bulletproof and stab-resistant vest according to any one of claims 1 to 5, wherein, The total number of layers of the first aramid nonwoven fabric, the second aramid nonwoven fabric, and the third aramid nonwoven fabric is 20 to 40.

7. The bulletproof and stab-resistant vest according to any one of claims 1 to 5, wherein, The buffer layer is one of ethylene-vinyl acetate copolymer foam board, polyvinyl chloride foam board, and polyethylene terephthalate foam board.

8. The bulletproof and stab-resistant vest according to claim 7, wherein, The thickness of the buffer layer is 1~3 mm.

9. A method for preparing the bulletproof and stab-resistant vest according to any one of claims 1 to 8, wherein, Includes the following steps: A first adhesive is obtained by mixing and stirring waterborne polyurethane, 1,4-butanediol, methyltrimethoxysilane, methyltrichlorosilane, melamine, and nano-montmorillonite. The first adhesive is injected into the glue box of a weaving machine, and a first aramid nonwoven fabric is woven using aramid fibers. Five to 15 layers of the first aramid nonwoven fabric are stacked to obtain a first protective layer. A second adhesive is obtained by mixing and stirring waterborne polyurethane, waterborne epoxy resin, methyl methacrylate, ethylene glycol, N-methyldiethanolamine, and titanate coupling agent. The second adhesive is injected into the glue box of a weaving machine, and a second aramid nonwoven fabric is woven using aramid fibers. After hot pressing the second aramid nonwoven fabric, 10 to 25 layers of the second aramid nonwoven fabric are stacked to obtain a second protective layer. A third adhesive is obtained by mixing and stirring waterborne polyurethane, aminomethyl silicone oil, ammonium polyphosphate and titanate coupling agent evenly. The third adhesive is injected into the glue box of a weaving machine, and a third aramid nonwoven fabric is woven using aramid fibers. After hot pressing the third aramid nonwoven fabric, 5 to 12 layers of the third aramid nonwoven fabric are stacked to obtain a third protective layer. The first protective layer, the second protective layer, the third protective layer and the buffer layer are stacked in sequence to obtain the protective chip. The protective chip is placed inside the outer garment to obtain the bulletproof and stab-proof vest. The hot pressing time is 15~20 min.

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