Basalt fiber composite fabric for police anti-stab clothing and preparation method thereof

Abstract

The application belongs to the technical field of composite fabrics, and particularly relates to a basalt fiber composite fabric for police anti-stab clothes and a preparation method thereof. The basalt fiber composite fabric for police anti-stab clothes comprises an anti-stab outer layer and a flame-retardant inner layer. The anti-stab outer layer is prepared from ultra-high molecular weight polyethylene fiber spinning. The flame-retardant inner layer is prepared from aramid fiber and composite basalt fiber blending. The flame-retardant inner layer is modified by adding the composite basalt fiber, and the composite fabric with excellent breaking strength, anti-stab performance and flame-retardant performance is obtained, which can fully meet the performance requirements of the police anti-stab clothes.

Description

Technical Field

[0001] This invention belongs to the field of composite fabric technology, specifically relating to a basalt fiber composite fabric for police stab-proof vests and its preparation method. Background Technology

[0002] Stab-resistant vests are protective gear made of ultra-high-strength fiber materials (such as ultra-high molecular weight polyethylene and aramid), primarily used to resist stabbing, cutting, and slashing attacks from knives, daggers, and other sharp objects, protecting the torso and internal organs from injury. Stab-resistant vests are mainly divided into soft stab-resistant vests, semi-flexible stab-resistant vests, and rigid stab-resistant vests. Soft stab-resistant vests are made of ultra-high-strength fiber blends, offering advantages such as light weight, thinness, flexibility in wear, no restriction on body movement, and suitability for extended wear. They are suitable for daily duty or high-risk operations by public security officers, armed police, military personnel, security guards, drivers, etc. Semi-flexible stab-resistant vests are made of a metal-resin composite material. Made of materials that combine stab protection and blast fragment protection, while also being waterproof, acid and alkali resistant, and UV resistant, it is suitable for special positions such as civil aviation security, court police, and financial institution security. Hard stab-proof vests are made of metal plates or ceramic plates, offering a high level of protection, but are heavy, lack flexibility, and have insufficient breathability, making them suitable for high-risk tactical operations or short-term high-intensity missions. Stab-proof vests not only need to have excellent stab protection capabilities but also good weather resistance and durability to ensure their service life. At the same time, to reduce the burden on protective personnel or equipment, stab-proof vests are gradually becoming lighter.

[0003] Application number CN202210469599.8 discloses a method for preparing basalt fiber protective clothing for complex environments. The protective clothing fabric includes a surface layer, an inner layer, and a middle layer. The surface layer is made of a blend of polyester fiber, carbon fiber, fluorosilicone rubber fiber, and nylon fiber. The middle layer is made of a blend of cotton fiber, modified basalt fiber, glass fiber, and vinylon fiber. The inner layer is made of a blend of nylon fiber, wool fiber, and cotton fiber. This patent involves mixing, melting, and spinning basalt ore, barium phosphate, and calcium chloride into basalt fiber. Basalt fiber precursor is processed by introducing carbon source gas and hydrogen to create graphitized carbon-coated modified basalt fiber. The basalt fiber-containing protective clothing provided by this patent has high thermal protection performance, realizing the application of basalt fiber in protective clothing. Basalt fiber itself has good tensile strength, toughness, temperature resistance, weather resistance and puncture resistance, meeting the requirements of stab-proof clothing fabric. How to realize the application of basalt fiber in stab-proof clothing and obtain a stab-proof clothing fabric containing basalt fiber with excellent comprehensive performance has become the research focus of this field. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a basalt fiber composite fabric for police stab-proof vests, comprising a stab-proof outer layer and a flame-retardant inner layer. By adding composite basalt fibers to modify the flame-retardant inner layer, a composite fabric with excellent tensile strength, stab resistance, and flame retardant properties is obtained, which can fully meet the performance requirements of police stab-proof vests.

[0005] The technical solution adopted by the present invention to achieve the above objectives is as follows: A basalt fiber composite fabric for police stab-proof vests, the composite fabric comprising a stab-proof outer layer and a flame-retardant inner layer.

[0006] Furthermore, the puncture-resistant outer layer is made of ultra-high molecular weight polyethylene fiber.

[0007] Furthermore, the flame-retardant inner layer is made of a blend of aramid fiber and composite basalt fiber.

[0008] Furthermore, the weight of the stab-resistant outer layer is 150-200 g / m². 2 The thickness is 0.5-0.6mm.

[0009] Furthermore, the flame-retardant inner layer is made of 50-60 parts by weight of aramid fiber and 30-40 parts by weight of composite basalt fiber blended together; the basis weight of the flame-retardant inner layer is 250-300 g / m². 2 The thickness is 0.8-1mm; Furthermore, the composite basalt fiber is prepared by the following method: S1. Add β-cyclodextrin and triethylamine to anhydrous dimethyl sulfoxide, stir well, place in an ice bath, and slowly add diethylphosphorous chloride dropwise. After the addition is complete, continue stirring for 3-4 hours to obtain modified cyclodextrin. S2. Add modified cyclodextrin and modified basalt fiber to dimethyl sulfoxide, stir evenly, add concentrated sulfuric acid dropwise, and after the addition is complete, place at 80-90℃ and continue stirring for 2-3 hours to obtain composite basalt fiber.

[0010] Furthermore, the molar ratio of β-cyclodextrin, diethylphosphite chloride, and triethylamine in step S1 is 1:3-4:2-3.

[0011] Furthermore, the mass ratio of modified cyclodextrin, modified basalt fiber, and concentrated sulfuric acid in step S2 is 1:2-3:0.1-0.2.

[0012] Further, the modified basalt fiber in step S2 is prepared by the following method: chlorinated basalt fiber is added to ethanol and stirred evenly, then carboxylated melamine and triethylamine are added, and the mixture is placed at 70-80℃ and stirred for 5-6 hours to obtain the modified basalt fiber.

[0013] Furthermore, the mass ratio of the chlorinated basalt fiber, carboxylated melamine, and triethylamine is 1:0.3-0.4:0.1-0.2.

[0014] Further, the carboxylated melamine is prepared by the following method: melamine, 4-chlorobutyric acid and triethylamine are added to acetonitrile, stirred evenly, placed at 60-70℃, and stirred for 4-5 hours to obtain carboxylated melamine.

[0015] Furthermore, the molar ratio of melamine, 4-chlorobutyric acid and triethylamine is 1:3.1-3.2:2.5-2.8.

[0016] The present invention also provides a method for preparing basalt fiber composite fabric for police stab-proof vests, comprising the following steps: sewing a stab-proof outer layer and a flame-retardant inner layer together with sewing thread to obtain a composite fabric.

[0017] The present invention has the following beneficial effects: This invention first reacts melamine with 4-chlorobutyric acid to obtain carboxylated melamine. Then, by reacting the chloroalkyl groups on the surface of chlorobasalt fibers with the amino groups in the carboxylated melamine, modified basalt fibers with melamine and carboxyl groups grafted onto the surface are obtained. This invention also reacts some hydroxyl groups in the β-cyclodextrin structure with diethylphosphorous chloride to obtain modified cyclodextrin with phosphate ester grafted onto the surface. Then, by reacting the hydroxyl groups in the modified cyclodextrin with the carboxyl groups on the surface of the modified basalt fibers, composite basalt fibers are obtained. The composite basalt fibers obtained by this invention contain a basalt fiber structure with good mechanical and flame-retardant properties. The composite fabric incorporates β-cyclodextrin, phosphate, and melamine structures, all chemically bonded together with strong binding forces. This contributes to improved tensile strength and flame retardant properties. The β-cyclodextrin structure promotes char formation, particularly synergistically with the nitrogen-phosphorus flame-retardant components formed by the phosphate and melamine structures to construct an intumescent flame-retardant system. During combustion, this system forms a continuous, dense, and porous intumescent char layer, effectively inhibiting heat release, smoke, and combustible gas escape, significantly increasing char residue. Furthermore, it interacts with the basalt fiber structure, thereby significantly enhancing the flame-retardant performance of the composite fabric. The basalt fiber composite fabric for police stab-proof vests provided by this invention includes a stab-proof outer layer and a flame-retardant inner layer. By adding composite basalt fiber to modify the flame-retardant inner layer, a composite fabric with excellent tensile strength, stab resistance and flame retardant properties is obtained, which can fully meet the performance requirements of police stab-proof vests. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. The technical features designed in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] In the technical solution of this invention, all chemical reagents used are commercially available, including β-cyclodextrin (CAS number 7585-39-9); diethylphosphite chloride (CAS number 589-57-1); concentrated sulfuric acid (CAS number 7664-93-9); 3-chloropropyltrimethoxysilane (CAS number 2530-87-2); melamine (CAS number 108-78-1); 4-chlorobutyric acid (CAS number 627-00-9); triethylamine (CAS number 121-44-8); dimethyl sulfoxide (CAS number 67-68-5); ethanol (CAS number 64-17-5); and acetonitrile (CAS number 75-05-8).

[0020] Example 1 A basalt fiber composite fabric for police stab-resistant vests, comprising a stab-resistant outer layer and a flame-retardant inner layer; wherein the stab-resistant outer layer is made of ultra-high molecular weight polyethylene fiber spinning, and the basis weight of the stab-resistant outer layer is 200 g / m². 2 The thickness is 0.5mm; the flame-retardant inner layer is made of 55 parts by weight of aramid fiber and 40 parts by weight of composite basalt fiber blend; the basis weight of the flame-retardant inner layer is 250g / m². 2 The thickness is 1mm.

[0021] Composite basalt fibers are prepared by the following method: S1. Add β-cyclodextrin and triethylamine to anhydrous dimethyl sulfoxide, stir well, place in an ice bath, and slowly add diethylphosphorous chloride dropwise. After the addition is complete, continue stirring for 4 hours. After the reaction is complete, remove the anhydrous dimethyl sulfoxide, wash the product with ethanol and dry to obtain modified cyclodextrin; wherein the molar ratio of β-cyclodextrin, diethylphosphorous chloride and triethylamine is 1:4:3. S2. Add modified cyclodextrin and modified basalt fiber to dimethyl sulfoxide, stir evenly, add concentrated sulfuric acid dropwise, and after the addition is complete, place at 80℃ and continue stirring for 3 hours. After the reaction is complete, remove anhydrous dimethyl sulfoxide, wash the product with ethanol and dry to obtain composite basalt fiber; wherein the mass ratio of modified cyclodextrin, modified basalt fiber and concentrated sulfuric acid is 1:3:0.2.

[0022] Modified basalt fiber was prepared by the following method: chlorinated basalt fiber was added to ethanol and stirred evenly. Carboxylated melamine and triethylamine were added, and the mixture was placed at 70°C and stirred for 6 hours. After the reaction was completed, the mixture was filtered, washed, and dried to obtain modified basalt fiber. The mass ratio of chlorinated basalt fiber, carboxylated melamine, and triethylamine was 1:0.4:0.2.

[0023] Carboxylated melamine was prepared by the following method: 10.0 g of melamine, 30.1 g of 4-chlorobutyric acid, and 22.5 g of triethylamine were added to 1000 mL of acetonitrile, stirred evenly, and placed at 60 °C for 5 h. After the reaction was completed, the reaction solvent was removed, and the product was extracted, concentrated, and dried to obtain 25.4 g of carboxylated melamine. The molar ratio of melamine, 4-chlorobutyric acid, and triethylamine was 1:3.1:2.8. ESI (m / z): 385.4 [M+H]+, 1H-NMR (600 MHz, DMSO-d6, δppm): 12.02 (s, 3H), 7.01 (s, 3H), 3.35-3.39 (m, 6H), 2.30-2.35 (m, 6H), 1.89-1.93 (m, 6H). The synthetic route is as follows: .

[0024] The chlorobasalt fiber was prepared by the following method: basalt fiber was added to an 80wt% ethanol solution and stirred until homogeneous. Then, 3-chloropropyltrimethoxysilane was added and the pH was adjusted to weakly acidic. The solution was placed at 60℃ and stirred for 4.5 h. After the reaction was completed, the solution was filtered, washed, and dried to obtain the chlorobasalt fiber. The mass ratio of basalt fiber to 3-chloropropyltrimethoxysilane was 1:0.2.

[0025] A method for preparing a basalt fiber composite fabric for police stab-proof vests includes the following steps: sewing a stab-proof outer layer and a flame-retardant inner layer together with sewing thread to obtain a composite fabric.

[0026] Example 2 A basalt fiber composite fabric for police stab-resistant vests, comprising a stab-resistant outer layer and a flame-retardant inner layer; wherein the stab-resistant outer layer is made of ultra-high molecular weight polyethylene fiber spinning, and the basis weight of the stab-resistant outer layer is 180 g / m². 2 The thickness is 0.55mm; the flame-retardant inner layer is made of 50 parts by weight of aramid fiber and 35 parts by weight of composite basalt fiber blend; the basis weight of the flame-retardant inner layer is 270g / m². 2 The thickness is 0.9mm.

[0027] Composite basalt fibers are prepared by the following method: S1. Add β-cyclodextrin and triethylamine to anhydrous dimethyl sulfoxide, stir well, place in an ice bath, and slowly add diethylphosphorous chloride dropwise. After the addition is complete, continue stirring for 3.5 h. After the reaction is complete, remove the anhydrous dimethyl sulfoxide, wash the product with ethanol and dry to obtain modified cyclodextrin; wherein the molar ratio of β-cyclodextrin, diethylphosphorous chloride and triethylamine is 1:3.5:2.5. S2. Add modified cyclodextrin and modified basalt fiber to dimethyl sulfoxide, stir evenly, add concentrated sulfuric acid dropwise, and after the addition is complete, place at 90℃ and continue stirring for 2.5 h. After the reaction is complete, remove anhydrous dimethyl sulfoxide, wash the product with ethanol and dry to obtain composite basalt fiber; wherein the mass ratio of modified cyclodextrin, modified basalt fiber and concentrated sulfuric acid is 1:2.5:0.15.

[0028] Modified basalt fiber was prepared by the following method: chlorinated basalt fiber was added to ethanol and stirred evenly. Carboxylated melamine and triethylamine were added, and the mixture was placed at 75°C and stirred for 5 hours. After the reaction was completed, the mixture was filtered, washed, and dried to obtain modified basalt fiber. The mass ratio of chlorinated basalt fiber, carboxylated melamine, and triethylamine was 1:0.35:0.15.

[0029] A method for preparing a basalt fiber composite fabric for police stab-proof vests includes the following steps: sewing a stab-proof outer layer and a flame-retardant inner layer together with sewing thread to obtain a composite fabric.

[0030] Example 3 A basalt fiber composite fabric for police stab-resistant vests, comprising a stab-resistant outer layer and a flame-retardant inner layer; wherein the stab-resistant outer layer is made of ultra-high molecular weight polyethylene fiber spinning, and the basis weight of the stab-resistant outer layer is 150 g / m². 2 The thickness is 0.6 mm; the flame-retardant inner layer is made of 60 parts by weight of aramid fiber and 30 parts by weight of composite basalt fiber blend; the basis weight of the flame-retardant inner layer is 300 g / m². 2 The thickness is 0.8mm.

[0031] Composite basalt fibers are prepared by the following method: S1. Add β-cyclodextrin and triethylamine to anhydrous dimethyl sulfoxide, stir well, place in an ice bath, and slowly add diethylphosphorous chloride dropwise. After the addition is complete, continue stirring for 3 hours. After the reaction is complete, remove the anhydrous dimethyl sulfoxide, wash the product with ethanol and dry to obtain modified cyclodextrin; wherein the molar ratio of β-cyclodextrin, diethylphosphorous chloride and triethylamine is 1:3:2. S2. Add modified cyclodextrin and modified basalt fiber to dimethyl sulfoxide, stir evenly, add concentrated sulfuric acid dropwise, and after the addition is complete, place at 85℃ and continue stirring for 2 hours. After the reaction is complete, remove anhydrous dimethyl sulfoxide, wash the product with ethanol and dry to obtain composite basalt fiber; wherein the mass ratio of modified cyclodextrin, modified basalt fiber and concentrated sulfuric acid is 1:2:0.1.

[0032] Modified basalt fiber was prepared by the following method: chlorinated basalt fiber was added to ethanol and stirred evenly. Carboxylated melamine and triethylamine were added, and the mixture was placed at 80°C and stirred for 5.5 hours. After the reaction was completed, the mixture was filtered, washed, and dried to obtain modified basalt fiber. The mass ratio of chlorinated basalt fiber, carboxylated melamine, and triethylamine was 1:0.3:0.1.

[0033] A method for preparing a basalt fiber composite fabric for police stab-proof vests includes the following steps: sewing a stab-proof outer layer and a flame-retardant inner layer together with sewing thread to obtain a composite fabric.

[0034] Comparative Example 1 A basalt fiber composite fabric for police stab-resistant vests, comprising a stab-resistant outer layer and a flame-retardant inner layer; wherein the stab-resistant outer layer is made of ultra-high molecular weight polyethylene fiber spinning, and the basis weight of the stab-resistant outer layer is 200 g / m². 2 The thickness is 0.5 mm; the flame-retardant inner layer is made of 55 parts by weight of aramid fiber and 40 parts by weight of modified basalt fiber blend; the basis weight of the flame-retardant inner layer is 250 g / m². 2 The thickness is 1mm.

[0035] The modified basalt fiber was prepared by the same method as in Example 1.

[0036] A method for preparing a basalt fiber composite fabric for police stab-proof vests includes the following steps: sewing a stab-proof outer layer and a flame-retardant inner layer together with sewing thread to obtain a composite fabric.

[0037] Comparative Example 2 A basalt fiber composite fabric for police stab-resistant vests, comprising a stab-resistant outer layer and a flame-retardant inner layer; wherein the stab-resistant outer layer is made of ultra-high molecular weight polyethylene fiber spinning, and the basis weight of the stab-resistant outer layer is 200 g / m². 2 The thickness is 0.5 mm; the flame-retardant inner layer is made of 55 parts by weight of aramid fiber and 40 parts by weight of basalt fiber blend; the basis weight of the flame-retardant inner layer is 250 g / m². 2 The thickness is 1mm.

[0038] A method for preparing a basalt fiber composite fabric for police stab-proof vests includes the following steps: sewing a stab-proof outer layer and a flame-retardant inner layer together with sewing thread to obtain a composite fabric.

[0039] Comparative Example 3 A basalt fiber composite fabric for police stab-resistant vests, comprising a stab-resistant outer layer and a flame-retardant inner layer; wherein the stab-resistant outer layer is made of ultra-high molecular weight polyethylene fiber spinning, and the basis weight of the stab-resistant outer layer is 200 g / m². 2 The thickness is 0.5 mm; the flame-retardant inner layer is made of 55 parts by weight of aramid fiber and 40 parts by weight of modified cyclodextrin blended together; the basis weight of the flame-retardant inner layer is 250 g / m². 2 The thickness is 1mm.

[0040] A method for preparing a basalt fiber composite fabric for police stab-proof vests includes the following steps: sewing a stab-proof outer layer and a flame-retardant inner layer together with sewing thread to obtain a composite fabric.

[0041] Performance testing The basalt fiber composite fabrics for police stab-resistant vests prepared in Examples 1 to 3 and Comparative Examples 1 to 3 were subjected to performance tests. The warp tensile breaking strength was tested according to GB / T3923.1-2013 standard; the stab resistance was tested according to GA68-2024 standard, using a standard knife with an energy impact of 24J±0.5J; the limiting oxygen index was tested according to GB / T2406.2-2009 standard; and the flammability was tested according to GB / T5455-2014 standard. The sample size was 300×80mm, the flame height was 4cm, the ignition time was 12s, and the afterflame time, smoldering time, and damage length were recorded. The test results are shown in the table below.

[0042] Table 1

[0043] As shown in Table 1, the composite fabrics of Examples 1 to 3 exhibit high warp tensile breaking strength and limiting oxygen index. They also showed no penetration in the puncture resistance test, and the afterflame time, smoldering time, and damaged length were all 0. This indicates that the composite fabric provided by the present invention possesses excellent breaking strength, puncture resistance, and flame retardant properties. Compared with Comparative Examples 1 to 3, the flame-retardant inner layer in Example 1 of the present invention is made of a blend of aramid fiber and composite basalt fiber. The composite basalt fiber contains basalt fiber structures with good mechanical and flame-retardant properties, β-cyclodextrin structures, and phosphate esters. The composite fabric possesses a unique structure, including a melamine structure, all chemically bonded together with strong adhesion. This strong bonding contributes to improved tensile strength and flame retardant properties. The β-cyclodextrin structure promotes char formation, particularly synergistically with the nitrogen-phosphorus flame-retardant components formed by the phosphate and melamine structures to construct an intumescent flame-retardant system. During combustion, this system forms a continuous, dense, and porous intumescent char layer, effectively inhibiting heat release, smoke, and combustible gas escape, significantly increasing char residue. Furthermore, it interacts with the basalt fiber structure, thereby significantly enhancing the flame-retardant performance of the composite fabric. It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A basalt fiber composite fabric for police stab-proof vests, characterized in that, The composite fabric includes a stab-resistant outer layer and a flame-retardant inner layer; the stab-resistant outer layer is made of ultra-high molecular weight polyethylene fiber; the flame-retardant inner layer is made of aramid fiber and composite basalt fiber blend. The composite basalt fiber is prepared by the following method: S1. Add β-cyclodextrin and triethylamine to anhydrous dimethyl sulfoxide, stir well, place in an ice bath, and slowly add diethylphosphorous chloride dropwise. After the addition is complete, continue stirring for 3-4 hours to obtain modified cyclodextrin. S2. Add modified cyclodextrin and modified basalt fiber to dimethyl sulfoxide, stir evenly, add concentrated sulfuric acid dropwise, and after the addition is complete, place at 80-90℃ and continue stirring for 2-3 hours to obtain composite basalt fiber.

2. The basalt fiber composite fabric for police stab-proof vests according to claim 1, characterized in that, The molar ratio of β-cyclodextrin, diethylphosphoryl chloride, and triethylamine in step S1 is 1:3-4:2-3.

3. The basalt fiber composite fabric for police stab-proof vests according to claim 1, characterized in that, The mass ratio of modified cyclodextrin, modified basalt fiber, and concentrated sulfuric acid in step S2 is 1:2-3:0.1-0.

2.

4. The basalt fiber composite fabric for police stab-proof vests according to claim 1, characterized in that, The modified basalt fiber described in step S2 is prepared by the following method: chlorinated basalt fiber is added to ethanol and stirred evenly. Carboxylated melamine and triethylamine are added, and the mixture is placed at 70-80℃ and stirred for 5-6 hours to obtain the modified basalt fiber.

5. The basalt fiber composite fabric for police stab-proof vests according to claim 4, characterized in that, The mass ratio of the chlorinated basalt fiber, carboxylated melamine, and triethylamine is 1:0.3-0.4:0.1-0.

2.

6. The basalt fiber composite fabric for police stab-proof vests according to claim 4, characterized in that, The carboxylated melamine is prepared by the following method: melamine, 4-chlorobutyric acid and triethylamine are added to acetonitrile, stirred evenly, and placed at 60-70℃ for 4-5 hours of stirring to obtain carboxylated melamine.

7. The basalt fiber composite fabric for police stab-proof vests according to claim 6, characterized in that, The molar ratio of melamine, 4-chlorobutyric acid and triethylamine is 1:3.1-3.2:2.5-2.

8.

8. The basalt fiber composite fabric for police stab-proof vests according to claim 1, characterized in that, The stab-resistant outer layer has a weight of 150-200 g / m². 2 The thickness is 0.5-0.6mm.

9. The basalt fiber composite fabric for police stab-proof vests according to claim 1, characterized in that, The flame-retardant inner layer is made of 50-60 parts by weight of aramid fiber and 30-40 parts by weight of composite basalt fiber blended together; the basis weight of the flame-retardant inner layer is 250-300 g / m². 2 The thickness is 0.8-1mm.

10. A method for preparing a basalt fiber composite fabric for police stab-proof vest as described in any one of claims 1-9, characterized in that, The process includes the following steps: sewing together a puncture-resistant outer layer and a flame-retardant inner layer with sewing thread to obtain a composite fabric.

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