Aramid composite polyethylene bulletproof helmet and preparation method thereof

Abstract

The application discloses an aramid composite polyethylene bulletproof helmet and a preparation method thereof, and solves the technical problem that the aramid composite bulletproof helmet in the prior art can meet the bulletproof performance requirement, but the manufacturing cost is high and is not suitable for the large equipment of the army. The aramid composite polyethylene bulletproof helmet comprises an outer helmet shell, an inner helmet shell and an external coating layer. The outer helmet shell is a multilayer outer helmet shell formed by pressing an ultra-high molecular weight polyethylene fiber without weft. The inner helmet shell is a multilayer inner helmet shell formed by pressing a dipped aramid woven fabric. The polyethylene fiber without weft has a cloth surface density of 70-100 g / m2, and the dipped aramid fabric has a cloth surface density of 300-420 g / m2. In terms of strength, the bulletproof helmet can effectively reduce the height of the bulge generated on the inner side of the helmet after bullet shooting, reduce the damage to the head of a user, effectively reduce the number of layers penetrated by the bullet, improve the safety of the helmet, and comprehensively reduce the manufacturing cost of the bulletproof helmet.

Description

Technical Field

[0001] This invention relates to a bulletproof helmet and its preparation method, specifically to an aramid composite polyethylene bulletproof helmet and its preparation method. Background Technology

[0002] A bulletproof helmet is a type of protective equipment for individual soldiers. It provides the most direct protection against bullet penetration damage to the head, absorbing and dissipating the energy of the bullet, preventing penetration, reducing blunt force trauma, and effectively protecting the human head.

[0003] Currently, lightweight bulletproof helmets can be broadly classified into two categories: aramid composite helmets and polyethylene (PE) composite helmets. They are manufactured using the following process: First, polyethylene (PE) or aramid non-woven fabric is cut to a predetermined shape; then, the cut pieces are layered, with each layer staggered at a certain angle; finally, the assembled bulletproof helmet blank is hot-pressed into shape using a mold.

[0004] Compared to aramid composite helmets, polyethylene composite helmets are cheaper, but their shells are thicker and have greater dynamic indentation, making them less suitable for the performance requirements of bulletproof helmets. Aramid composite helmets, on the other hand, have advantages such as thinner shells, less dynamic indentation, better high-temperature resistance, and better rigidity. However, overall, aramid composite helmets are more expensive to manufacture and are not suitable for mass production or military deployment. Summary of the Invention

[0005] The purpose of this invention is to provide an aramid composite polyethylene bulletproof helmet and its preparation method, so as to solve the technical problem that although the existing aramid composite bulletproof helmet can meet the requirements of bulletproof performance, its high production cost makes it unsuitable for large-scale equipment by the military.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The present invention provides an aramid composite polyethylene bulletproof helmet, characterized in that it comprises an outer shell, an inner shell, and an outer coating; the outer shell is formed by pressing multiple layers of ultra-high molecular weight polyethylene fiber non-woven fabric; the inner shell is formed by pressing multiple layers of impregnated aramid woven fabric; and the outer coating is made of acrylic nanocomposite material.

[0008] Furthermore, the surface density of the ultra-high molecular weight polyethylene fiber nonwoven fabric is 70-100 g / m², and the surface density of the dipped aramid woven fabric is 300-420 g / m².

[0009] Furthermore, the number of layers in the ultra-high molecular weight polyethylene fiber nonwoven fabric is 38 to 60.

[0010] Furthermore, the number of layers in the dipped aramid woven fabric is 10 to 15.

[0011] The present invention provides a method for preparing an aramid composite polyethylene bulletproof helmet, comprising the following steps:

[0012] S1. Cutting fabric pieces: Cut each layer of dipped aramid woven fabric and ultra-high molecular weight polyethylene fiber nonwoven fabric according to the pattern;

[0013] S2, Laying: First, lay multiple layers of dipped aramid woven fabric on the helmet punch in a staggered manner, and then continue to stack multiple layers of ultra-high molecular weight polyethylene fiber non-woven fabric in a staggered manner.

[0014] S3. Pre-compression molding: Start the hydraulic press to pre-compress the device laid out in step S2;

[0015] S4. Trimming: Using a fabric cutter with a blade, the excess material around the helmet shell after pre-pressing in step S3 is cut off along the mold line to obtain a helmet shell blank.

[0016] S5. Vacuum sealing: Place the helmet shell blank obtained in step S4 into the static pressure die, seal it with a sealing bag and vacuum it.

[0017] S6. Isothermal static pressing: The helmet and model after vacuuming in step S5 are immersed in the pressure cylinder of the isothermal static press for isothermal static pressing composite molding.

[0018] S7. Finishing and painting: Remove the helmet after isothermal static pressing in step S6 from the static pressing mold, further grind and smooth the edges of the helmet, and spray paint evenly on the inner and outer surfaces of the bulletproof helmet.

[0019] Furthermore, in step S3, the pre-pressing temperature is 60℃±5℃, the pressure is 10MPa±2MPa, and the temperature and pressure are kept constant for 55-60 minutes.

[0020] Furthermore, step S6, isothermal hydrostatic composite molding, specifically includes the following steps: gradually heating the medium in the pressure cylinder to 115℃~120℃, then increasing the pressure to 22MPa±2Mpa, maintaining stable temperature and pressure for 55~60min, maintaining stable pressure and starting to cool the medium to 50℃, releasing the pressure in the cylinder, and taking out the helmet and model.

[0021] Furthermore, the aramid woven fabric is obtained by twisting the warp and weft yarns and then weaving them into woven fabric, and then treating the obtained aramid woven fabric with an impregnation process.

[0022] Based on the above technical solution, the embodiments of the present invention can produce at least the following technical effects:

[0023] The bulletproof helmet and its manufacturing method provided by this invention, while meeting the requirements for bulletproof performance and reducing dynamic indentation, can significantly reduce the production cost of bulletproof helmets, thus meeting the large-scale equipment needs of the military. The inner layer of the bulletproof helmet is made of woven aramid impregnated fabric, and the outer layer is made of ultra-high molecular weight polyethylene fiber non-woven fabric, combined through a vacuum high-pressure composite structure. The bulletproof helmet manufactured using this structural design and process fully utilizes the high strength and composite properties of the woven aramid impregnated fabric and the ultra-high molecular weight polyethylene fiber non-woven fabric. In terms of strength, the bulletproof helmet can effectively reduce the height of the bulge formed on the inside of the helmet after bullet impact, reducing injury to the user's head; it also effectively reduces the number of layers penetrated by the bullet, improving the helmet's safety. In terms of cost, due to the use of ultra-high molecular weight polyethylene fiber non-woven fabric, the production cost of the bulletproof helmet is greatly reduced while ensuring its strength, resulting in high economic benefits. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0026] Figure 2 This is a schematic diagram of step S2 of the present invention;

[0027] Figure 3 This is a schematic diagram of step S6 of the present invention.

[0028] In the image: 1. Outer shell; 2. Inner shell; 3. Surface coating. Detailed Implementation

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In addition, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0030] The objective of this invention is achieved through the following technical solution:

[0031] Example 1

[0032] 1.1 Material Selection

[0033] This invention provides an aramid composite polyethylene bulletproof helmet, comprising an outer shell 1, an inner shell 2, and an outer coating 3; the outer shell 1 is formed by pressing multiple layers of ultra-high molecular weight polyethylene fiber non-woven fabric; the inner shell 2 is formed by pressing multiple layers of impregnated aramid woven fabric; the outer coating 3 is made of acrylic nanocomposite material. The surface density of the polyethylene fiber non-woven fabric is 85 g / m², and the surface density of the impregnated aramid fabric is 360 g / m².

[0034] 1.2 Preparation steps

[0035] This invention provides a method for preparing an aramid composite polyethylene bulletproof helmet, comprising the following preparation steps:

[0036] S1. Cutting fabric pieces: Cut each layer of dipped aramid woven fabric and ultra-high molecular weight polyethylene fiber nonwoven fabric according to the pattern;

[0037] S2, Laying: First, lay multiple layers of dipped aramid woven fabric on the helmet punch in a staggered manner, and then continue to stack multiple layers of ultra-high molecular weight polyethylene fiber non-woven fabric in a staggered manner; the number of layers of the dipped aramid woven fabric is 15 layers, and the number of layers of the ultra-high molecular weight polyethylene fiber non-woven fabric is 38 layers.

[0038] S3, Pre-pressing: Start the hydraulic press to pre-press the device laid out in step S2. The temperature of the pre-pressing in step S3 is 60℃ and the pressure is 10MPa. Keep the temperature and pressure unchanged and press for 57 minutes.

[0039] S4. Trimming: Using a fabric cutter with a blade, the excess material around the helmet shell after pre-pressing in step S3 is cut off along the mold line to obtain a helmet shell blank.

[0040] S5. Vacuum sealing: Place the helmet shell blank obtained in step S4 into the static pressure die, seal it with a sealing bag and vacuum it.

[0041] S6. Isothermal static pressing: Immerse the helmet and model after vacuuming in step S5 into the pressure cylinder of the isothermal static press for isothermal static pressing composite molding. The isothermal static pressing composite molding specifically includes the following steps: gradually heat the medium in the pressure cylinder to 116°C, then increase the pressure to 22 MPa, maintain the temperature and pressure stable for 57 minutes, maintain the pressure stable and start cooling the medium to 50°C, release the pressure in the cylinder, and take out the helmet and model.

[0042] S7. Finishing and painting: Remove the helmet after isothermal static pressing in step S6 from the static pressing mold, further grind and smooth the edges of the helmet, and spray paint evenly on the inner and outer surfaces of the bulletproof helmet.

[0043] Example 2

[0044] 2.1 Material Selection

[0045] This invention provides an aramid composite polyethylene bulletproof helmet, comprising an outer shell 1, an inner shell 2, and an outer coating 3; the outer shell 1 is formed by pressing multiple layers of ultra-high molecular weight polyethylene fiber non-woven fabric; the inner shell 2 is formed by pressing multiple layers of impregnated aramid woven fabric; the outer coating 3 is made of acrylic nanocomposite material. The surface density of the polyethylene fiber non-woven fabric is 70 g / m², and the surface density of the impregnated aramid fabric is 300 g / m².

[0046] 2.2 Preparation steps

[0047] This invention provides a method for preparing an aramid composite polyethylene bulletproof helmet, comprising the following preparation steps:

[0048] S1. Cutting fabric pieces: Cut each layer of dipped aramid woven fabric and ultra-high molecular weight polyethylene fiber nonwoven fabric according to the pattern;

[0049] S2, Laying: First, lay multiple layers of dipped aramid woven fabric on the helmet punch in a staggered manner, and then continue to stack multiple layers of ultra-high molecular weight polyethylene fiber non-woven fabric in a staggered manner; the dipped aramid woven fabric has 13 layers and the ultra-high molecular weight polyethylene fiber non-woven fabric has 46 layers.

[0050] S3, Pre-pressing: Start the hydraulic press to pre-press the device laid out in step S2. The temperature of the pre-pressing in step S3 is 55℃ and the pressure is 8MPa. Keep the temperature and pressure unchanged and press for 55 minutes.

[0051] S4. Trimming: Using a fabric cutter with a blade, the excess material around the helmet shell after pre-pressing in step S3 is cut off along the mold line to obtain a helmet shell blank.

[0052] S5. Vacuum sealing: Place the helmet shell blank obtained in step S4 into the static pressure die, seal it with a sealing bag and vacuum it.

[0053] S6. Isothermal static pressing: Immerse the helmet and model after vacuuming in step S5 into the pressure cylinder of the isothermal static press for isothermal static pressing composite molding. The isothermal static pressing composite molding specifically includes the following steps: gradually heat the medium in the pressure cylinder to 115°C, then increase the pressure to 20 MPa, maintain the temperature and pressure stable for 55 minutes, maintain the pressure stable and start cooling the medium to 50°C, release the pressure in the cylinder, and take out the helmet and model.

[0054] S7. Finishing and painting: Remove the helmet after isothermal static pressing in step S6 from the static pressing mold, further grind and smooth the edges of the helmet, and spray paint evenly on the inner and outer surfaces of the bulletproof helmet.

[0055] Example 3

[0056] 3.1 Material Selection

[0057] This invention provides an aramid composite polyethylene bulletproof helmet, comprising an outer shell 1, an inner shell 2, and an outer coating 3. The outer shell 1 is formed by pressing multiple layers of ultra-high molecular weight polyethylene fiber non-woven fabric. The inner shell 2 is formed by pressing multiple layers of impregnated aramid woven fabric. The outer coating 3 is made of acrylic nanocomposite material. The surface density of the polyethylene fiber non-woven fabric is 100 g / m², and the surface density of the impregnated aramid fabric is 420 g / m².

[0058] 3.2 Preparation steps

[0059] This invention provides a method for preparing an aramid composite polyethylene bulletproof helmet, comprising the following preparation steps:

[0060] S1. Cutting fabric pieces: Cut each layer of dipped aramid woven fabric and ultra-high molecular weight polyethylene fiber nonwoven fabric according to the pattern;

[0061] S2, Laying: First, lay multiple layers of dipped aramid woven fabric on the helmet punch in a staggered manner, and then continue to stack multiple layers of ultra-high molecular weight polyethylene fiber non-woven fabric in a staggered manner; the number of layers of the dipped aramid woven fabric is 10 layers, and the number of layers of the ultra-high molecular weight polyethylene fiber non-woven fabric is 60 layers.

[0062] S3, Pre-pressing: Start the hydraulic press to pre-press the device laid out in step S2. The temperature of the pre-pressing in step S3 is 65℃ and the pressure is 12MPa. Keep the temperature and pressure unchanged and press for 60 minutes.

[0063] S4. Trimming: Using a fabric cutter with a blade, the excess material around the helmet shell after pre-pressing in step S3 is cut off along the mold line to obtain a helmet shell blank.

[0064] S5. Vacuum sealing: Place the helmet shell blank obtained in step S4 into the static pressure die, seal it with a sealing bag and vacuum it.

[0065] S6. Isothermal static pressing: Immerse the helmet and model after vacuuming in step S5 into the pressure cylinder of the isothermal static press for isothermal static pressing composite molding. The isothermal static pressing composite molding specifically includes the following steps: gradually heat the medium in the pressure cylinder to 120°C, then increase the pressure to 24 MPa, maintain the temperature and pressure stable for 60 minutes, maintain the pressure stable and start cooling the medium to 50°C, release the pressure in the cylinder, and take out the helmet and model.

[0066] S7. Finishing and painting: Remove the helmet after isothermal static pressing in step S6 from the static pressing mold, further grind and smooth the edges of the helmet, and spray paint evenly on the inner and outer surfaces of the bulletproof helmet.

[0067] Test results

[0068] The bulletproof helmets prepared in Examples 1-3 were tested for bullet impact performance.

[0069]

[0070] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An aramid composite polyethylene bulletproof helmet, characterized in that: It includes an outer shell (1), an inner shell (2), and an outer coating (3); the outer shell (1) is an outer shell formed by pressing multiple layers of ultra-high molecular weight polyethylene fiber non-woven fabric; the inner shell (2) is an inner shell formed by pressing multiple layers of dipped aramid woven fabric; the outer coating (3) is made of acrylic nanocomposite material; The preparation method of the aramid composite polyethylene bulletproof helmet includes the following steps: S1. Cutting fabric pieces: Cut each layer of dipped aramid woven fabric and ultra-high molecular weight polyethylene fiber nonwoven fabric according to the pattern; S2, Laying: First, lay multiple layers of dipped aramid woven fabric on the helmet punch in a staggered manner, and then continue to stack multiple layers of ultra-high molecular weight polyethylene fiber non-woven fabric in a staggered manner. S3, Pre-pressing: Start the hydraulic press to pre-press the device laid out in step S2; The temperature of the pre-pressing in step S3 is 60℃±5℃, the pressure is 10MPa±2MPa, and the temperature and pressure are kept constant for 55 to 60 minutes. S4. Trimming: Using a fabric cutter with a blade, the excess material around the helmet shell after pre-pressing in step S3 is cut off along the mold line to obtain a helmet shell blank. S5. Vacuum sealing: Place the helmet shell blank obtained in step S4 into the static pressure die, seal it with a sealing bag and vacuum it. S6. Isothermal static pressing: The helmet and model after vacuuming in step S5 are immersed in the pressure cylinder of the isothermal static press for isothermal static pressing composite molding; the isothermal static pressing composite molding in step S6 specifically includes the following steps: gradually heating the medium in the pressure cylinder to 115℃~120℃, then increasing the pressure to 22MPa±2Mpa, maintaining the temperature and pressure stable for 55~60min, maintaining the pressure stable and starting to cool the medium to 50℃, releasing the pressure in the cylinder, and taking out the helmet and model; S7. Finishing and painting: Remove the helmet after isothermal static pressing in step S6 from the static pressing mold, further grind and smooth the edges of the helmet, and spray paint evenly on the inner and outer surfaces of the bulletproof helmet.

2. The aramid composite polyethylene bulletproof helmet according to claim 1, characterized in that: The surface density of the ultra-high molecular weight polyethylene fiber nonwoven fabric is 70-100 g / m², and the surface density of the aramid-impregnated woven fabric is 300-420 g / m².

3. The aramid composite polyethylene bulletproof helmet according to claim 2, characterized in that: The number of layers in the ultra-high molecular weight polyethylene fiber nonwoven fabric is 38 to 60.

4. The aramid composite polyethylene bulletproof helmet according to claim 2, characterized in that: The number of layers in the dipped aramid woven fabric is 10 to 15.

5. The aramid composite polyethylene bulletproof helmet according to claim 1, characterized in that: The aramid woven fabric is obtained by twisting the warp and weft yarns and then weaving them into woven fabric, and then treating the obtained aramid woven fabric with an impregnation process.

Images