A flexible, rollable, overlapping stab-proof layer, a stab-proof garment, and a preparation method thereof

Abstract

The present invention relates to the technical field of stab-proof body protection, and more specifically, to a flexible, rollable, overlapping stab-proof layer, a stab-proof garment, and a method for preparing the same. The stab-proof layer comprises a protective cover and an inner core within the cover. The inner core comprises a stab-proof base fabric to which are bonded a plurality of closely spaced stab-proof sheets. The stab-proof sheets are provided with overlapping sheets, which cover the joints of adjacent stab-proof sheets. One side of the overlapping sheet is bonded to the stab-proof sheet, and the other side of the overlapping sheet overlaps and covers the adjacent stab-proof sheet. The stab-proof base fabric is aramid fabric, and the stab-proof sheets and overlapping sheets are heat-pressed from aramid fabric prepreg or carbon fiber fabric prepreg. The stab-proof garment of the present invention is constructed by overlapping multiple small-sized stab-proof sheets and overlapping sheets. The overall structure is flexible and rollable, greatly enhancing fit and ensuring flexibility and convenience for the wearer during activities.

Description

Technical Field

[0001] The invention relates to a flexible and rollable overlapping stab-proof layer, a stab-proof garment and a preparation method thereof, and belongs to the technical field of stab-proof body protection. Background Art

[0002] Stab-resistant clothing has become an important piece of personal protective equipment due to its strong stab-proof capabilities and easy portability. Furthermore, stab-resistant clothing plays a vital role in other special environments and in daily personal safety. Its product quality, technological content, and protective capabilities have become a focus of industry attention.

[0003] The GA68-2024 standard for police stab-resistant clothing, which officially came into effect on July 1, 2024, sets new requirements for weight, thickness, and flexibility. However, existing rigid stab-resistant clothing often features internal metal or ceramic plates. These high-hardness materials directly resist the impact of a knife through their own strength, hindering the cutting force. While these types of clothing offer excellent protection, are easy to manufacture, and are low-cost, they also have numerous drawbacks, such as being heavy and rigid, which limits mobility when worn, making them difficult to meet the new standard's weight and flexibility requirements. Soft stab-resistant clothing's soft liner is primarily made from high-performance filament fabric or felt, which is woven, coated, or impregnated. While these linings offer advantages such as softness and ease of storage, they also offer disadvantages such as weaker stab protection and poor thermal and moisture comfort when layered together, making them difficult to meet the new standard's thickness requirements.

[0004] Patent application publication number CN201088147Y discloses a protective body with metal sheets bonded to it for use in stab-resistant clothing. The body consists of a garment sheet, an adhesive, and the metal sheets, which are bonded to the garment sheet using the adhesive. The presence of the metal sheets significantly reduces the comfort of the garment. Patent application publication number CN112318954A discloses a single-layer composite material sheet with stab-resistant properties. The sheet is formed by combining two layers of unidirectional fiber prepreg through a special weaving process and then molding them. The layers are bonded with resin. Garments made with this single-layer composite material exhibit poor flexibility.

[0005] Therefore, how to improve the lightweight and flexibility of stab-resistant clothing while meeting the protective performance requirements is a problem that continues to concern those skilled in the art. The present invention optimizes materials, structure, and process to produce a stab-resistant clothing that meets the new standards. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the present invention provides a flexible, rollable, overlapping stab-proof layer, a stab-proof garment and a preparation method thereof. The stab-proof layer can reduce the weight of the stab-proof garment and improve the softness and wearing comfort of the stab-proof garment.

[0007] The present invention solves the above-mentioned technical problem with the following technical solution: a flexible, rollable, overlapping stab-proof layer, the stab-proof layer comprising a protective cover and a stab-proof layer inner core located within the protective cover, the stab-proof layer inner core comprising a stab-proof base fabric, a plurality of closely arranged stab-proof sheets bonded to the stab-proof base fabric, an overlapping sheet provided on the stab-proof sheet, the overlapping sheet covering the joint of adjacent stab-proof sheets, one side of the overlapping sheet bonded to the stab-proof sheet, and the other side of the overlapping sheet overlapping and covering the adjacent stab-proof sheet;

[0008] The stab-proof base fabric is aramid fabric, and the stab-proof sheet and the overlapping sheet are obtained by hot pressing aramid fabric prepreg or carbon fiber fabric prepreg.

[0009] Furthermore, the stab-proof sheet is a rectangular structure, and the overlapping sheet is an L-shaped structure;

[0010] The side length of the stab-proof sheet is 2.5-5.0 cm, and the width of each side strip of the overlapping sheet is 6-9 mm.

[0011] Furthermore, the surface density of the stab-proof base fabric is 260-350 g / m 2 ;

[0012] The thickness of the stab-proof sheet and the overlapping sheet is 1-2 mm, and the weight of the single-layer prepreg is 280-330 g / m 2 ;

[0013] The overall thickness of the stab-proof layer is 2-4 mm, and the rubber content of the stab-proof layer is 35-55%.

[0014] Furthermore, when preparing the stab-proof sheet and the overlapping sheet, aramid fabric or carbon fiber fabric is compounded with epoxy resin to form a prepreg;

[0015] The stab-proof sheet or overlapping sheet is made by hot-pressing 6-12 layers of prepreg.

[0016] Furthermore, the adhesive used in bonding is at least one of an adhesive prepared from an acrylic latex and a curing agent, a moisture-curing reactive polyurethane hot melt adhesive, and an epoxy resin adhesive;

[0017] The mass ratio of the acrylic latex to the curing agent is 10:(0.8-1).

[0018] Furthermore, the protective cover is a waterproof and breathable fabric formed by laminating a woven fabric made of polyamide yarn and a waterproof and breathable membrane.

[0019] The present invention also discloses a method for preparing a flexible, rollable, overlapping stab-proof layer, the preparation method comprising:

[0020] Hot pressing multiple layers of aramid fabric prepreg or carbon fiber fabric prepreg to obtain a composite material flat plate, and cutting the composite material flat plate to obtain the stab-proof sheet and the overlapping sheet;

[0021] Applying adhesive on the stab-proof base fabric and bonding the stab-proof sheet to the stab-proof base fabric; then applying glue on the edge of the stab-proof sheet, bonding a portion of the overlapping sheet to the stab-proof sheet, and overlapping and covering another portion of the overlapping sheet on the adjacent stab-proof sheet to obtain the stab-proof layer inner core;

[0022] The inner core of the stab-proof layer is placed in the protective sleeve, and heat-sealed to finally obtain the stab-proof layer.

[0023] Furthermore, when the adhesive is a glue prepared from acrylic latex and a curing agent or a moisture-curing reactive polyurethane hot melt adhesive, after the stab-proof sheet is evenly covered on the glue-coated stab-proof base cloth, it is maintained at a temperature of 60-80°C and a pressure of 0.1-1.0 MPa for 0.5-1.0 hours to achieve bonding between the stab-proof sheet and the stab-proof base cloth.

[0024] Furthermore, the composite material flat plate is cut using a laser or a water jet to obtain the stab-proof sheet and the overlapping sheet.

[0025] The present invention also discloses a stab-proof garment, which is obtained by installing the stab-proof layer of the present invention into the stab-proof area of a stab-proof garment jacket, wherein the stab-proof base fabric of the inner core of the stab-proof layer faces the inside of the body, and the overlapping piece of the inner core of the stab-proof layer faces the outside.

[0026] The beneficial effects of the present invention are:

[0027] Compared to traditional hard and multi-layered soft stab-proof clothing, the stab-proof clothing of the present invention is lighter overall, with the stab-proof layer weighing 0.7-1.6 kg. Furthermore, the thickness of the stab-proof layer is significantly reduced, with the stab-proof sheet thickness controlled at 1-2 mm and the overall thickness of the stab-proof layer at 2-4 mm. This meets the weight and thickness requirements of GA68-2024 for police stab-proof clothing. This significantly reduces the wearer's weight and foreign body sensation.

[0028] The stab-proof layer of the present invention comprises several stab-proof sheets joined together, which helps ensure that the stab-proof layer maintains good rollability. By providing overlapping sheets at the joints of the stab-proof sheets and using a suitable bonding method for the overlapping sheets, stab-proof performance can be provided at the tightly fitted seams of the stab-proof sheets, avoiding stab-proof blind spots caused by gaps in the seams. At the same time, the overall stab-proof layer can still maintain good bendability after the overlapping structure is bonded. As a result, the stab-proof garment has excellent safety performance and ensures good wearing comfort.

[0029] The stab-proof clothing of the present invention is composed of multiple small-sized stab-proof sheets and overlapping sheets. The overall structure is soft and rollable, which greatly enhances the body's fit and ensures the wearer's flexibility and convenience during activities. The stab-proof clothing of the present invention has the advantages of being light and thin, which can reduce the weight and thickness of the stab-proof clothing while meeting protection requirements, thereby improving the softness and wearing comfort of the stab-proof clothing. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the installation arrangement of the stab-proof sheet and the overlapping sheet on the stab-proof base fabric;

[0031] Figure 2 The explosion structure diagram of the anti-stab plate and the overlap plate;

[0032] Figure 3 It is a schematic diagram of the structure of the anti-stab sheet and the overlapping sheet;

[0033] In the figure, 1. Anti-stab sheet; 2. Overlap sheet. DETAILED DESCRIPTION

[0034] The present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used are only for describing specific embodiments and are not intended to limit the present invention.

[0036] A flexible, rollable, overlapping stab-proof layer, comprising a protective cover and a stab-proof layer inner core located within the protective cover. The stab-proof layer inner core comprises a stab-proof base fabric, to which a plurality of tightly arranged stab-proof sheets 1 are bonded. The stab-proof sheets 1 are provided with overlapping sheets 2, which cover the joints of adjacent stab-proof sheets 1. One side of the overlapping sheet 2 is bonded to the stab-proof sheet 1, and the other side of the overlapping sheet 2 overlaps and covers the adjacent stab-proof sheet 1.

[0037] The stab-proof base fabric is aramid fabric, and the stab-proof sheet 1 and the overlapping sheet 2 are obtained by hot pressing aramid fabric prepreg or carbon fiber fabric prepreg.

[0038] Specifically, such as Figure 1-Figure 2 As shown, the stab-proof sheet 1 is a rectangular structure, and the overlapping sheet 2 is an L-shaped structure;

[0039] like Figure 3 As shown, the side lengths (L1 and L2) of the stab-proof sheet 1 are 2.5-5.0 cm, and the width of each side strip of the overlapping sheet 2 is (W ) is 6-9mm.

[0040] When the side length of the stab-proof sheet 1 is 2.5-5.0 cm, it achieves a balance between flexibility, ease of processing, and efficiency. Using L-shaped overlapping pieces 2 and a rectangular structure for the stab-proof sheet 1 facilitates installation and interplay between the two pieces. The inner angled portion of the L-shaped overlapping piece 2 is bonded to the two edges of one stab-proof sheet 1, while the outer angled portion of the L-shaped overlapping piece 2 overlaps the two adjacent stab-proof sheets 1. This allows the stab-proof layer to maintain good flexibility while avoiding blind spots caused by gaps in the seams of the stab-proof sheet 1. Furthermore, the dimensions of the stab-proof sheet 1 and overlapping pieces 2 ensure excellent flexibility while making the layer lighter, softer, and more comfortable. If the stab-proof sheet 1 is too large, the stab-proof layer will be less flexible. If the stab-proof sheet 1 is too small, more overlapping pieces 2 and more adhesive will be required, resulting in increased weight and reduced flexibility.

[0041] More specifically, the stab-proof base fabric is a high surface density twill fabric woven from para-aramid yarn, and the surface density of the stab-proof base fabric is 260-350 g / m 2 If the surface density of the stab-proof base fabric is too low, it will be detrimental to the anti-stab safety and the adhesion of the stab-proof sheet 1 to the stab-proof base fabric; if the surface density of the stab-proof base fabric is too high, it will increase the weight of the overall stab-proof layer and also affect the wearing comfort.

[0042] The thickness of the stab-proof sheet 1 and the overlapping sheet 2 is 1-2 mm, and the weight of the single-layer prepreg is 280-330 g / m 2 ;

[0043] The overall thickness of the stab-proof layer is 2-4 mm, and the rubber content of the stab-proof layer is 35-55%.

[0044] Preferably, the stab-proof sheet 1 and the overlapping sheet 2 have the same thickness.

[0045] More preferably, the width of the overlapping piece 2 pasted on the stab-proof sheet 1 accounts for 1 / 4 to 1 / 2 of the width of the overlapping piece 2, the width of the overlapping piece 2 not bonded to the stab-proof sheet 1 is 3-5 mm, and the width of the bonding part of the overlapping piece 2 and the stab-proof sheet 1 is ≥2.5 mm.

[0046] More preferably, the thickness of the stab-proof sheet 1 is h , in mm; the width of the overlapping portion of the lap joint 2 that is not bonded to the stab-proof sheet 1 (ie, the width of the overlapping portion) is w , the unit is mm, then w ≥1.8e 0.32h The width of the overlapped piece 2 isW , the unit is mm, then W <10.2e -0.12h Under this relationship condition, it is more conducive to taking into account both puncture-proof safety and lightness and comfort at the same time.

[0047] Specifically, when preparing the stab-proof sheet 1 and the overlapping sheet 2, aramid fabric or carbon fiber fabric is compounded with epoxy resin to form a prepreg;

[0048] The stab-proof sheet 1 or the overlapping sheet 2 is made by hot-pressing 6-12 layers of prepreg.

[0049] In the embodiment of the present invention, the prepreg formed by compounding aramid fabric or carbon fiber fabric with epoxy resin is an existing product (1084K / AP200 Weihai Lanke Composite Materials Technology Co., Ltd.).

[0050] According to the resin curing process, set the hot press parameters such as temperature, pressure, time, heating and cooling rate and time, and exhaust times. After the hot pressing is completed, remove the composite material plate.

[0051] Specifically, the adhesive used for bonding is at least one of an adhesive prepared from an acrylic latex and a curing agent, a moisture-curing reactive polyurethane hot melt adhesive, and an epoxy resin adhesive;

[0052] The mass ratio of the acrylic latex to the curing agent is 10:(0.8-1).

[0053] Specifically, the protective cover is a black waterproof and breathable fabric formed by laminating a woven fabric woven from polyamide yarn and a waterproof and breathable membrane.

[0054] The protective cover has excellent dimensional stability and waterproof and breathable properties, ensuring a good seal after being filled with 6L of tap water and suspended for 30 minutes. Furthermore, when tested at a water pressure increase rate of 6.0 kPa / min ± 0.3 kPa / min, the hydrostatic pressure level meets or exceeds Level 3 as specified in GB / T 4744-2013. After the stab-resistant layer is prepared, it is placed within the stab-resistant protective cover, which is then heat-sealed.

[0055] The present invention also discloses a method for preparing a flexible, rollable, overlapping stab-proof layer, the preparation method comprising:

[0056] Hot pressing multiple layers of aramid fabric prepreg or carbon fiber fabric prepreg to obtain a composite material flat plate, and cutting the composite material flat plate to obtain the stab-proof sheet 1 and the overlapping sheet 2;

[0057] Applying adhesive to the stab-proof base fabric, bonding the stab-proof sheet 1 to the stab-proof base fabric; then applying glue to the edge of the stab-proof sheet 1, bonding a portion of the overlapping sheet 2 to the stab-proof sheet 1, and overlapping and covering another portion of the overlapping sheet 2 on the adjacent stab-proof sheet 1 to obtain the stab-proof layer inner core;

[0058] The inner core of the stab-proof layer is placed in the protective sleeve, and heat-sealed to finally obtain the stab-proof layer.

[0059] Specifically, when an adhesive prepared by acrylic latex and a curing agent is used to bond the stab-proof sheet 1, the mass ratio of the acrylic latex to the curing agent is 10:(0.8-1). The acrylic main agent and the curing agent are mixed and mechanically stirred. The speed is set to 300-500 r / min and the stirring time is 5-20 min. After static defoaming, ultrasonic defoaming or centrifugal defoaming, the adhesive is evenly coated on the stab-proof base fabric using a wire rod or a coating machine or other related equipment, and the stab-proof sheet 1 is evenly covered on the stab-proof base fabric after the adhesive is applied.

[0060] When using a moisture-curing reactive polyurethane hot melt adhesive to bond the stab-proof sheet 1, place the hot melt adhesive in an oven and heat it for 1-2 hours. When the hot melt adhesive becomes a uniformly flowing liquid, take it out and evenly apply the glue on the stab-proof base cloth using a wire rod or coating machine or other related equipment. Then, evenly cover the stab-proof sheet 1 on the glue-coated stab-proof base cloth, and ensure that the stab-proof sheets 1 fit tightly together without obvious gaps.

[0061] Finally, place the whole stab-proof sheet 1 and the stab-proof base on a hot press, set the temperature to 60-80° C. and the pressure to 0.1-1.0 MPa, keep for 0.5-1 hour, and then place at room temperature and pressure.

[0062] Specifically, the composite material flat plate is cut by laser or water jet to obtain the stab-proof sheet 1 and the overlap sheet 2, so as to ensure that the cut surface is smooth and flat without burrs, so that the stab-proof sheets 1 have good size fit when being bonded together, and there is no obvious gap between adjacent stab-proof sheets 1.

[0063] More specifically, when bonding the overlapping sheet 2, the edge of the stab-proof sheet 1 is evenly coated with epoxy resin AB glue or acrylic glue using a glue brush. The glue coating width is the bonding width of the overlapping sheet 2. The overlapping sheet 2 is pasted on the joint of the adjacent stab-proof sheet 1 to ensure that part of the overlapping sheet 2 is in contact with the glue. The remaining width of the overlapping sheet 2 is naturally overlapped on the adjacent stab-proof sheet 1. After being placed at room temperature and pressure for 0.5-1 hour, the inner core of the stab-proof layer is completed.

[0064] The present invention also discloses a stab-proof garment. The stab-proof layer of the present invention is incorporated into the stab-proof area of a stab-proof garment outer shell to form the garment. The stab-proof base fabric of the inner core of the stab-proof layer faces inward, and the overlapping pieces 2 of the inner core of the stab-proof layer face outward. The functional layer of the stab-proof garment is generally divided into two parts: a front piece and a back piece. Targeted localized protection can also be provided at locations such as the waist, thereby increasing the overall protective area of the garment.

[0065] Example 1

[0066] The method for preparing the stab-resistant clothing provided in this embodiment comprises the following steps:

[0067] (1) Cutting of stab-proof base fabric:

[0068] Aramid fabric (high density twill fabric woven from para-aramid yarn with an area density of 300 g / m 2 ) is cut into the required shape and size, and transparent tape is applied to all four sides to prevent them from falling apart. The aramid fabric is then secured to the bottom of the template to prevent the stab-resistant base fabric from slipping when the adhesive patch is applied.

[0069] (2) Preparation of stab-proof tablets

[0070] The stab-proof sheet is a composite material made from aramid woven prepreg via a hot-pressing process. The aramid fabric used is a plain weave (TH1101) made from para-aramid filaments from Taihe New Materials Group, which is then combined with epoxy resin (2125B, Weihai Lanke Composite Materials Technology Co., Ltd.) to form the aramid prepreg.

[0071] Cut the aramid prepreg into 4cm×4cm square sheets: After aligning and laying out the 8 layers of prepreg, wrap them with release paper and place them on the hot pressing table of the hot press. Set the process parameters on the hot press: heating rate 1℃ / min, temperature rise to 80℃, holding time 30min, then vent 3-5 times, pressurize to 6.0MPa, hold time 180min, cooling rate 2℃ / min. After cooling, take out the composite material flat sheet and clean the glue overflow on the edge. According to the size of the anti-stab sheet 4cm×4cm and the L-shaped overlap sheet width of 6mm (the width of the longitudinal and transverse overlaps are both 6mm), design the cutting path on the water jet cutting machine, draw the layout diagram, and generate the cutting code. Fix the composite material sheet on the cutting machine, adjust the blade depth and cutting origin, and confirm the start of cutting. After cutting, take out the anti-stab sheet and wipe it clean for use. The weight of the single-layer prepreg is 300 g / m 2 .

[0072] (3) Pasting of stab-proof sheet:

[0073] Mix 10 parts of acrylic latex (1318s) with 1 part of curing agent (PM-200) until evenly combined. Use a mechanical stirrer at 300 rpm for 15 minutes. Allow to stand for defoaming to create the adhesive. Apply the adhesive evenly to the stab-resistant base fabric using a wire rod. Lay the stab-resistant sheet cut in the previous step tightly onto the base fabric. Then, place the sheet in a hot press at 60°C and 0.1 MPa, maintaining the temperature and pressure for 30 minutes.

[0074] (4) Lapping sheet pasting:

[0075] Remove the stab-proof base fabric containing the stab-proof sheets from the previous step. Apply the glue prepared in the previous step to the top and right edges of each stab-proof sheet, applying a 3mm layer. Attach the overlapping sheets to each edge of the stab-proof sheet, ensuring the inner edges of the overlapping sheets contact the glue and the outer edges overlap the adjacent stab-proof sheet. Once all the square stab-proof sheets have been attached, the stab-proof core is complete.

[0076] (5) Post-processing:

[0077] The stab-resistant inner layer prepared in the previous step is arranged according to the shape of the stab-resistant outer garment and cut using a laser cutter. The outer layer is then sealed with waterproof and breathable black heat-sealed fabric (KB-TPU802 from Zhejiang Kebang New Materials Co., Ltd.). After lamination, the entire stab-resistant layer is inserted into the outer garment. The product logo is affixed to the collar, along with relevant information such as the production date.

[0078] The stab-resistant clothing manufactured in this example was tested according to the requirements of the Ministry of Public Security GA68-2024 "Police Stab-Resistant Clothing" standard for Class A stab-resistant clothing. The test results are shown in Table 1.

[0079] Example 2

[0080] The method for preparing the stab-resistant clothing provided in this embodiment comprises the following steps:

[0081] (1) Cutting of stab-proof base fabric:

[0082] Aramid fabric (high surface density twill fabric woven from para-aramid yarn with a surface density of 260 g / m 2 ) is cut into the required shape and size, and transparent tape is applied to all four sides to prevent them from falling apart. The aramid fabric is then secured to the bottom of the template to prevent the stab-resistant base fabric from slipping when the adhesive patch is applied.

[0083] (2) Preparation of stab-proof tablets:

[0084] The stab-proof sheet is a composite material made from carbon fiber woven fabric prepreg via a hot-pressing process. The carbon fiber woven fabric used is a plain weave fabric made from T300-3K filaments, which is then combined with epoxy resin (2125B, Weihai Lanke Composite Materials Technology Co., Ltd.) to form the carbon fiber prepreg. The carbon fiber prepreg is cut into 40cm x 40cm square sheets. After 12 layers of prepreg are aligned and laid out, they are wrapped in release paper and placed on the hot press table. The process parameters set on the hot press are: a heating rate of 1°C / min, a temperature increase to 80°C, a holding time of 30 minutes, followed by 3-5 venting cycles, a pressurization to 6.0 MPa, a holding time of 180 minutes, and a cooling rate of 2°C / min. After cooling, the composite sheet is removed and any excess glue is cleaned from the edges. According to the size of the stab-proof sheet of 3cm×3cm and the L-shaped overlap sheet of 8mm width (the width of the longitudinal and transverse overlap strips are both 8mm), the cutting path is designed on the laser cutting machine, the layout diagram is drawn, and the cutting code is generated. The composite material sheet is fixed on the cutting machine, the laser power and speed are adjusted, the cutting origin is located, and the cutting start is confirmed. After the cutting is completed, the stab-proof sheet is removed and set aside. The single-layer prepreg has a gram weight of 330 g / m 2 .

[0085] (3) Pasting of stab-proof sheet:

[0086] Heat moisture-curing reactive polyurethane hot melt adhesive (8040-FR Tianyang New Materials) in an oven for 2 hours. Once the hot melt adhesive becomes a uniform, flowing liquid, remove the adhesive and evenly apply it to the aramid woven fabric using a coating spatula. Lay the stab-resistant sheet cut in the previous step firmly onto the stab-resistant base fabric. Then, place the fabric in a hot press, set to 80°C and 0.1 MPa, and hold for 30 minutes.

[0087] (4) Pasting of overlapping pieces:

[0088] Remove the stab-resistant base fabric with stab-resistant sheets from the previous step. Apply epoxy glue (9030, Shenzhen Tegu New Materials Co., Ltd.) to the top and right edge of each stab-resistant sheet, applying a 4mm thick layer. Attach overlapping sheets to each edge of the stab-resistant sheet, ensuring the inner edge of the sheet contacts the glue and the outer edge overlaps the adjacent sheet. Once all square stab-resistant sheets have been attached, the stab-resistant core is complete.

[0089] (5) Post-processing:

[0090] The stab-resistant inner layer prepared in the previous step is arranged according to the shape of the stab-resistant outer garment, cut using a laser cutter, and sealed with waterproof, breathable black heat-sealed fabric. After bonding, the entire stab-resistant layer is inserted into the outer garment. The product logo is affixed to the collar, along with relevant information such as the production date.

[0091] The stab-resistant clothing manufactured in this example was tested according to the requirements of the Ministry of Public Security GA68-2024 "Police Stab-Resistant Clothing" standard for Class A stab-resistant clothing. The test results are shown in Table 1.

[0092] Example 3

[0093] The method for preparing the stab-resistant clothing provided in this embodiment comprises the following steps:

[0094] (1) Cutting of stab-proof base fabric:

[0095] Aramid fabric (high density twill fabric woven from para-aramid yarn with an area density of 350 g / m 2 ) is cut into the required shape and size, and transparent tape is applied to all four sides to prevent them from falling apart. The aramid fabric is then secured to the bottom of the template to prevent the stab-resistant base fabric from slipping when the adhesive patch is applied.

[0096] (2) Preparation of stab-proof tablets

[0097] The stab-proof sheet is a composite material made from aramid woven prepreg through a hot pressing process. The aramid woven fabric used is a plain woven fabric formed by weaving para-aramid filaments produced by Taihe New Materials Group, which is compounded with epoxy resin (2125B, Weihai Lanke Composite Materials Technology Co., Ltd.) to form the aramid prepreg. The aramid prepreg is cut into 40cm×40cm square sheets. After aligning and laying the six layers of prepreg, they are wrapped with release paper and placed on the hot press table. The process parameters on the hot press are set as follows: heating rate of 1°C / min, temperature rise to 80°C, holding time of 30 minutes, followed by venting 3-5 times, pressurization to 6.0MPa, holding time of 180 minutes, and cooling rate of 2°C / min. After cooling, the composite material plate is removed and the glue overflow at the edge is cleaned. According to the size of the stab-proof sheet of 5cm×5cm and the L-shaped overlap sheet of 6mm width (the width of the longitudinal and transverse overlap strips are both 6mm), the cutting path is designed on the laser cutting machine, the layout diagram is drawn, and the cutting code is generated. The composite material sheet is fixed on the cutting machine, the laser power and speed are adjusted, the cutting origin is located, and the cutting start is confirmed. After the cutting is completed, the stab-proof sheet is taken out and used for later use. The single-layer prepreg has a gram weight of 280 g / m 2 .

[0098] (3) Pasting of stab-proof sheet:

[0099] Heat moisture-curing reactive polyurethane hot melt adhesive (8040-FR Tianyang New Materials) in an oven for 2 hours. Once the hot melt adhesive becomes a uniform, flowing liquid, remove the adhesive and evenly apply it to the aramid woven fabric using a coating spatula. Lay the stab-resistant sheet cut in the previous step tightly onto the stab-resistant base fabric. Then, place the fabric in a hot press, set the temperature to 60°C and the pressure to 0.1 MPa, and hold for 30 minutes.

[0100] (4) Pasting of overlapping pieces:

[0101] Remove the stab-resistant base layer prepared in the previous step and apply epoxy glue (9030, Shenzhen Tegu New Materials Co., Ltd.) to the top and right edge of each stab-resistant sheet, applying a 3mm width. Attach the overlapping sheets to each edge of the stab-resistant sheet, ensuring the inner edges of the overlapping sheets contact the glue and the outer edges overlap the adjacent stab-resistant sheet. Once the overlapping sheets are attached to the edges of all square stab-resistant sheets, the stab-resistant core is complete.

[0102] (5) Post-processing

[0103] The stab-resistant inner layer prepared in the previous step is arranged according to the shape of the stab-resistant outer garment, cut using a laser cutter, and sealed with waterproof, breathable black heat-sealed fabric. After bonding, the entire stab-resistant layer is inserted into the outer garment. The product logo is affixed to the collar, along with relevant information such as the production date.

[0104] The stab-resistant clothing manufactured in this example was tested according to the requirements of the Ministry of Public Security GA68-2024 "Police Stab-Resistant Clothing" standard for Class A stab-resistant clothing. The test results are shown in Table 1.

[0105] Example 4

[0106] The stab-resistant garment was prepared by the same method as in Example 2, except that the width of the overlapping piece in Example 4 was 9 cm (the widths of the longitudinal strips and the transverse strips were both 9 mm).

[0107] Comparative Example 1

[0108] The preparation method of the stab-resistant clothing provided in this comparative example 1 is a conventional metal sheet material, and the specific preparation process includes the following steps:

[0109] (1) Manufacturing of the stab-proof inner core:

[0110] Cut stab-proof stainless steel sheets (0.1mm thick) into several layers according to the shape and size of the stab-proof clothing. Based on the protection requirements, stack 10 layers of metal sheets together and wrap the edges with anti-cut tape to prevent sharp metal edges from cutting the outer layer of the stab-proof layer and the outer jacket of the stab-proof clothing, causing potential human harm.

[0111] (2) Post-processing:

[0112] Seal the stab-resistant inner layer prepared in the previous step with waterproof, breathable black heat-sealed fabric. Once attached, insert the entire stab-resistant layer into the outer garment. Affix the product logo to the collar, along with the production date and other relevant information.

[0113] Comparative Example 2

[0114] The stab-resistant garment was prepared by the same method as in Example 1, except that the composite material flat plate in Comparative Example 2 was not cut into stab-resistant sheets. Instead, the entire composite material flat plate was directly pasted onto the stab-resistant base fabric as the inner core of the stab-resistant layer. The other process methods were the same as in Example 1.

[0115] Comparative Example 3

[0116] The stab-resistant garment was prepared by the same method as in Example 1, except that: in this comparative example 3, when preparing the inner core of the stab-resistant layer, no overlapping sheet was pasted. Other process methods were the same as in Example 1.

[0117] Comparative Example 4

[0118] The stab-resistant clothing was prepared by the same method as in Example 3, except that: in the preparation of the stab-resistant inner core in this comparative example 4, the width of the overlapped piece was W It is 4 mm (lower than the width defined in the present invention).

[0119] Comparative Example 5

[0120] The stab-resistant clothing was prepared by the same method as in Example 2, except that: in the preparation of the stab-resistant inner core in this comparative example 5, the width of the overlapped piece was W It is 12 mm (larger than the width defined in the present invention).

[0121] Comparative Example 6

[0122] The stab-resistant clothing was prepared by the same method as in Example 1, except that the amount of curing agent added in step (3) of this comparative example 6 was increased, and the stab-resistant sheet could be attached without being processed in a hot press. The specific preparation process of step (3) was as follows:

[0123] Mix 10 parts of acrylic latex (1318s) and 1.3 parts of curing agent (PM-200) until evenly combined. Use a mechanical stirrer at 300 rpm for 15 minutes. Allow to stand for defoaming to create an adhesive. Apply the adhesive evenly to the stab-resistant base fabric using a wire rod. Place the cut stab-resistant sheeting onto the base fabric tightly and place it at room temperature and pressure to adhere the sheeting.

[0124] Table 1 Performance test results

[0125]

[0126] The data in the table are tested according to the test standard of "GA68-2024 Police Anti-stab Clothing". The thickness in the table is the total thickness of the overlapping piece and the anti-stab piece. The curvature refers to the pressure value when the anti-stab clothing is bent 20mm. The average value is taken as the reported curvature value.

[0127] From the above table data, it can be seen that the stab-proof clothing of the present invention is composed of multiple small-sized stab-proof sheets and overlapping sheets. The overall structure is soft and rollable, which greatly enhances the body fit and ensures the wearer's flexibility and convenience during activities. The stab-proof clothing of the present invention has the advantages of being light and thin. It can reduce the weight and thickness of the stab-proof clothing while meeting the protection requirements, and improve the softness and wearing comfort of the stab-proof clothing. In addition, from the comparison of the data of Example 4 and Example 2, it can be seen that when the structural dimensions of the overlapping sheets meet the requirements of the stab-proof clothing, the stab-proof clothing can be more comfortable to wear. w ≥1.8e 0.32h 、 W <10.2e -0.12h When the stab-proof clothing is used, it is more conducive to making it lighter and easier to bend while having better stab resistance.

[0128] From the comparison of the data of Comparative Example 1 and Examples 1-4, it can be seen that the stab-proof layer of the present invention can significantly improve the wearing comfort compared with the conventional metal stab-proof layer.

[0129] Comparing the data from Comparative Example 2 and Example 1, it can be seen that when a single composite flat sheet was directly bonded to the stab-resistant base fabric as the inner core of the stab-resistant layer, the bending test failed when the load was increased to 180N, failing to achieve a deformation of 20mm. Testing was terminated to prevent further pressure from irreversibly damaging the stab-resistant layer, indicating poor wearing comfort.

[0130] From the comparison of the data of Comparative Example 3 and Example 1, it can be seen that if the overlapping piece is not attached when preparing the inner core of the stab-proof layer, the stab-proof clothing is very easy to be punctured, and the safety is significantly affected.

[0131] From the comparison of the data of Comparative Example 4 and Example 1, it can be seen that if the width of the overlapping piece is too small, the processing process is more troublesome, and the overlapping piece is easy to fall off when stabbed with a knife, and there is a risk of puncture.

[0132] From the comparison of the data of Comparative Example 5 and Example 2, it can be seen that if the width of the overlapping piece is too large, the overall weight of the stab-resistant garment will be overweight, affecting the wearing comfort.

[0133] Comparing the data from Comparative Example 6 and Example 1 shows that increasing the amount of curing agent allows the stab-resistant sheet to adhere without the need for heat and pressure treatment. However, the shortened curing time of the glue can easily lead to the stab-resistant sheet curing before placement, which increases processing speed. Furthermore, after curing, the stab-resistant layer becomes hardened, and its bending properties deteriorate, thus affecting wearing comfort. The present invention, by adding a suitable proportion of curing agent and combining it with a subsequent heat and pressure treatment, ultimately achieves a secure adhesion of the stab-resistant sheet while ensuring excellent bending properties of the stab-resistant garment, thereby improving wearing comfort.

[0134] The technical features of the above-described embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are exhaustively listed. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0135] For those skilled in the art, several variations and improvements may be made without departing from the scope of the present invention, which all fall within the scope of protection of the present invention. The scope of protection of the present invention shall be based on the appended claims.

Claims

1. A flexible, rollable, overlapping stab-proof layer, characterized in that: The stab-proof layer includes a protective cover and an inner core of the stab-proof layer located within the protective cover. The inner core of the stab-proof layer includes a stab-proof base fabric. A plurality of tightly arranged stab-proof sheets are bonded to the stab-proof base fabric. The stab-proof sheets are provided with overlapping sheets, which cover the joints of adjacent stab-proof sheets. One side of the overlapping sheet is bonded to the stab-proof sheet, and the other side of the overlapping sheet overlaps and covers the adjacent stab-proof sheet. The stab-proof base fabric is aramid fabric, and the stab-proof sheet and the overlapping sheet are made by hot pressing aramid fabric prepreg; The side length of the stab-proof sheet is 2.5-5.0 cm, and the width of each side strip of the overlapping sheet is 6-9 mm. The thickness of the stab-proof sheet and the overlapping sheet is 1-2 mm. The width of the overlapping sheet pasted on the stab-proof sheet accounts for 1 / 4 to 1 / 2 of the width of the overlapping sheet side strip. The width of the overlapping sheet not bonded to the stab-proof sheet is 3-5 mm, and the width of the bonding portion between the overlapping sheet and the stab-proof sheet is ≥ 2.5 mm. The adhesive used for bonding is at least one of an adhesive prepared from acrylic latex and a curing agent, a moisture-curing reactive polyurethane hot melt adhesive, and an epoxy resin adhesive; The mass ratio of the acrylic latex to the curing agent is 10:(0.8-1).

2. The flexible, rollable, overlapping stab-proof layer according to claim 1, characterized in that: The stab-proof sheet is a rectangular structure, and the overlapping sheet is an L-shaped structure.

3. The flexible, rollable, overlapping stab-proof layer according to claim 1, characterized in that: The surface density of the stab-proof base fabric is 260-350 g / m 2 ; Single-layer prepreg weight is 280-330 g / m 2 ; The overall thickness of the stab-proof layer is 2-4 mm, and the rubber content of the stab-proof layer is 35-55%.

4. The flexible, rollable, overlapping stab-proof layer according to claim 1, characterized in that: When preparing the stab-proof sheet and the overlapping sheet, aramid fabric and epoxy resin are compounded to form a prepreg; The stab-proof sheet or overlapping sheet is made by hot-pressing 6-12 layers of prepreg.

5. The flexible, rollable, overlapping stab-proof layer according to claim 1, characterized in that: The protective cover is a waterproof and breathable fabric formed by laminating a woven fabric woven from polyamide yarn and a waterproof and breathable membrane.

6. A method for preparing a flexible, rollable, overlapping stab-proof layer according to any one of claims 1 to 5, characterized in that: The preparation method is: Hot pressing a multi-layer aramid fabric prepreg to obtain a composite material flat plate, and cutting the composite material flat plate to obtain the stab-proof sheet and the overlapping sheet; Applying adhesive on the stab-proof base fabric and bonding the stab-proof sheet to the stab-proof base fabric; then applying glue on the edge of the stab-proof sheet, bonding a portion of the overlapping sheet to the stab-proof sheet, and overlapping and covering another portion of the overlapping sheet on the adjacent stab-proof sheet to obtain the stab-proof layer inner core; The inner core of the stab-proof layer is placed in the protective sleeve, and heat-sealed to finally obtain the stab-proof layer.

7. The method for preparing a flexible, rollable, overlapping stab-proof layer according to claim 6, characterized in that: When the adhesive is a glue prepared from acrylic latex and a curing agent or a moisture-curing reactive polyurethane hot melt adhesive, the stab-proof sheet is evenly covered on the glue-coated stab-proof base cloth, and then maintained at a temperature of 60-80°C and a pressure of 0.1-1.0 MPa for 0.5-1.0 hour to achieve bonding between the stab-proof sheet and the stab-proof base cloth.

8. The method for preparing a flexible, rollable, overlapping stab-proof layer according to claim 6, characterized in that: The composite material flat plate is cut by using a laser or a water jet to obtain the stab-proof sheet and the overlapping sheet.

9. A stab-resistant garment, characterized in that: The stab-proof garment is obtained by installing the stab-proof layer according to any one of claims 1 to 5 into the stab-proof area of a stab-proof garment outer shell, wherein the stab-proof base fabric of the inner core of the stab-proof layer faces the inside of the body, and the overlapping piece of the inner core of the stab-proof layer faces the outside.

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