CN116878336A - Bulletproof insert plate and preparation method thereof - Google Patents

Abstract

The invention relates to a bullet-proof insert plate and a preparation method thereof. Through a simple and appropriate process, a suitable solidified layer, an ultra-high molecular weight polyethylene bullet-proof curved plate, a hot-melt adhesive film and a dent-reducing material are selected, assembled in sequence, and heat-sealed by a four-column hydraulic press. , spray paint, the surface density of the bulletproof insert plate produced does not exceed 16kg/m ² , and the dent that resists 6 rounds of 56-type 7.62mm ordinary bullets (steel core) does not exceed 25mm.

Description

Bulletproof insert plate and preparation method thereof

Technical field

The invention belongs to the technical field of protective equipment, and specifically relates to a bulletproof insert plate and a preparation method thereof.

Background technique

The bulletproof insert is a protective device that can withstand high-speed bullets or fragments and other ballistic objects. It is widely used in military, aerospace, special materials and other fields. Traditional bulletproof inserts are mostly made of metal materials or ceramic materials. These materials have good bulletproof properties, but are often heavy and easily damaged. Therefore, finding new lightweight materials has become a research hotspot in the current field of bulletproof insert plate manufacturing. Patent CN202022496929.1 discloses a bulletproof structure, including: a bulletproof layer, the bulletproof layer includes a multi-layer ultra-high molecular weight polyethylene fiber braided structure, and the braiding direction of two adjacent layers of the ultra-high molecular weight polyethylene fiber braided structure Arranged at 90°, the bullet-proof layer has an area density of 50g/m ² -60g/m ² ; and an anti-dent layer, the anti-dent layer is arranged on the back surface of the bullet-proof layer, and the anti-dent layer includes Multi-layered super fiber three-dimensional braided structure; the dent result of the final bulletproof structure 2 in the instructions is 26.0mm, and the theoretical surface density is 19.26kg/m ² . Patent CN201910989828.7 discloses a production process for bulletproof insert plates, which includes 8 steps. A four-column hydraulic press is used for pressing, and a pressing pressure of 1.0MPa-1.5MPa is applied to the composite plate. The temperature is maintained at 15°C to 28°C and the humidity is Less than 90%, lasting 5 hours-12 hours, preparation time is longer. Therefore, the bulletproof inserts prepared by the existing technology either have an area density that is too large, above 18kg/ ^m2 ; or the preparation process is complex and the preparation time is too long, making it impossible to achieve mass production.

Contents of the invention

The invention provides a bullet-proof insert plate and a preparation method thereof to solve the technical problems of the current bullet-proof insert plate having a large surface density, a deep depression that can withstand 6 rounds of 56-type 7.62mm ordinary bullets (steel core), and a complicated preparation process.

The contents of the present invention include:

A method for preparing a bulletproof insert plate, including the following steps:

(1) Preparation of ultra-high molecular weight polyethylene bulletproof curved panels;

(2) Select a dent-reducing material, a hot-melt adhesive film and a solidified layer. The dent-reducing material is one of EVA, PC sheets, PPA, and D30;

(3) Assemble the solidified layer, ultra-high molecular weight polyethylene bulletproof curved panel, hot melt adhesive film and dent reduction material in sequence, seal, vacuum, and heat seal with a four-column hydraulic machine;

(4) The heat-sealed material is sprayed with paint and air-dried to form;

The operation process of the four-column hydraulic press is as follows:

Increase the temperature and pressure, the pressure reaches 15-20Mpa, and the temperature reaches 70-85℃;

Maintain the above temperature and pressure for a period of time;

Continue to increase the temperature and pressure, the pressure reaches 20-25Mpa, and the temperature reaches 110-130℃;

Maintain the above temperature and pressure for a period of time;

Return to normal temperature and pressure.

Further, the preparation method of the ultra-high molecular weight polyethylene bulletproof curved panel is: selecting ultra-high molecular weight polyethylene woven fabric with an area density of 70-76g/ ^m2 , flat laying, overlapping, typesetting, cutting, weighting and suppress.

Furthermore, the counterweight is to select the cut weftless fabrics one by one, remove the mosquitoes, impurities, defects and other fabric samples, and then stack and stack the fabric samples according to the prescribed surface density.

Further, the EVA is an ethylene-vinyl acetate copolymer; the PC sheet is a polycarbonate sheet; PPA is polyphthalamide; and D30 is a polymer gel material.

Further, the operation process of the four-column hydraulic press in step (3) is as follows:

0-30min, the pressure reaches 17Mpa and the temperature reaches 75-80℃;

31-45min, maintain temperature and pressure for 15 minutes;

45-55min, the pressure reaches 22Mpa and the temperature reaches 115-125℃;

56-120min, maintain temperature and pressure for 65 minutes;

121-180min, release the pressure and lower the temperature to normal temperature.

Further, in the preparation method of the ultra-high molecular weight polyethylene bullet-proof curved panel, the surface density of the ultra-high molecular weight polyethylene bullet-proof curved panel is 13-13.5kg/m ² .

Further, in step (2), the hot melt adhesive film is one of EVA, TPU and PO.

Furthermore, the main component of the PO hot melt adhesive film is polyolefin; the TPU hot melt adhesive is also called TPU hot melt double-sided tape, and its main component is polyurethane; the main component of the EVA hot melt adhesive film is vinyl acetate copolymer.

Further, the solidified layer in step (2) is one of aramid, glass fiber or ultra-high molecular weight polyethylene fiber.

Further, in the step (4), the paint is black polyurea component B: black polyurea component A = 1.2:0.8.

Further, the diameter of the nozzle used for spraying in step (4) is Ф1.2mm, and the spraying distance is 550~630mm.

Further, in the step (4), the temperature of spray paint is 65~75°C, and the air drying and resting time for molding is 5~6 hours.

A bulletproof insert plate, the surface density of the bulletproof insert plate is ≤16kg/m ² , and it can withstand 6 rounds of 56-type 7.62mm ordinary bullets with a dent of ≤25mm.

The beneficial effects of the present invention are:

(1) In terms of preparation process, this method is simple and easy to operate, has short preparation time, high production efficiency, and can achieve mass production;

(2) By controlling the hot pressing temperature of the four-column hydraulic press during the preparation process to avoid being too high or too low, you can generally obtain a bulletproof insert plate with better mechanical properties;

(3) The surface density of the bullet-proof insert plate produced does not exceed 16kg/m ² (the surface density of the bullet-proof insert plate made by ordinary methods is above 18kg/m ² ), and it can withstand 6 rounds of 56-type 7.62mm ordinary bullets ( The dent of the steel core shall not exceed 25mm (refer to the GA141-2010 Level 5 standard), which is domestically advanced.

Description of the drawings

Figure 1 is a schematic structural diagram of the bulletproof insert plate of the present invention. 1 is the solidified layer, 2 is the ultra-high molecular weight polyethylene bulletproof curved plate, 3 is the hot melt adhesive film, and 4 is the dent reduction material.

Detailed ways

Example 1

(1) Preparation of ultra-high molecular weight polyethylene bulletproof curved panels

Select ultra-high molecular weight polyethylene weft-free fabric with an area density of 72g/ ^m2 and lay it on the workbench. It is required that the fabric be laid flat and each layer overlaps. Use a special version of clothing design software to automatically layout and cut according to the size of the bulletproof inserts;

The cut pieces will be transported to the counterweight room in time for counterweighting and pressing. The density control range of the ultra-high molecular weight polyethylene bulletproof curved panel is 13-13.5kg/m ² .

(2) Selection of dent reduction materials, solidified layer materials and hot melt adhesive films

Select D30 material as the dent reduction material;

Choose aramid material as the cured layer;

Choose TPU adhesive film as the hot melt adhesive film.

(3) Enter the four-column hydraulic press for heat sealing

Assemble the cured layer, ultra-high molecular weight polyethylene bulletproof curved panel, hot melt adhesive film and dent reduction material according to the structure in Figure 1;

Then place it on the loading table, seal the assembled raw materials with a sealing bag, and then perform a vacuum operation to confirm that the sealing bag is not damaged, and then put the sealing bag into a four-column hydraulic press for heat sealing;

The operating process of the four-column hydraulic press is as follows:

0-30min, the pressure reaches 17mpa and the temperature reaches 75℃;

31-45min, maintain temperature and pressure for 15 minutes;

45-55min, the pressure reaches 22mpa and the temperature reaches 115℃;

56-120min, maintain temperature and pressure for 65 minutes;

121-180min, release the pressure and lower the temperature to normal temperature to obtain the semi-finished product.

(4) Bulletproof insert plate spray molding

Preparation: paint (black polyurea component B): curing agent (black polyurea component A) = 1.2:0.8. Heat the equipment to 65°C and start spraying. Select the nozzle diameter Ф1.2mm and the spraying distance is 600mm. , evenly spray half of the product surface, and finally let it air dry for 5 hours to get the bulletproof insert plate.

Example 2

PPA (polyphthalamide) was selected as the dent-reducing material, and the others were the same as in Example 1.

Example 3

The operating process of the four-column hydraulic press is as follows:

0-30min, the pressure reaches 17mpa and the temperature reaches 80℃;

31-45min, maintain temperature and pressure for 15 minutes;

45-55min, the pressure reaches 22mpa and the temperature reaches 125℃;

56-120min, maintain temperature and pressure for 65 minutes;

121-180min, release the pressure and lower the temperature to normal temperature to obtain the semi-finished product;

Others are the same as in Embodiment 1.

Comparative example 1

The operating process of the four-column hydraulic press is as follows:

0-30min, the pressure reaches 17mpa and the temperature reaches 110℃;

31-45min, maintain temperature and pressure for 15 minutes;

45-55min, the pressure reaches 22mpa and the temperature reaches 135℃;

56-120min, maintain temperature and pressure for 65 minutes;

121-180min, release the pressure and lower the temperature to normal temperature to obtain the semi-finished product;

Others are the same as in Embodiment 1.

The surface density of the bulletproof insert plate obtained in Examples 1-3 and Comparative Example 1, the number of bullets and the dent distance against Type 56 7.62mm ordinary bullets (steel core) are as shown in Table 1 below.

Table 1 Test results of bulletproof insert plate

Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only illustrative, and is not intended to imply that the protection scope of the present application is limited to these examples; under the ideas of the present application, the above embodiments or different embodiments Technical features can also be combined, steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the application as described above, which are not provided in detail for the sake of brevity.

One or more embodiments of the present application are intended to embrace all such alternatives, modifications, and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments in this application shall be included in the protection scope of this application.

Claims (10)

1. The preparation method of the bulletproof plugboard is characterized by comprising the following steps of:

(1) Preparing an ultra-high molecular weight polyethylene bulletproof curved plate;

(2) Selecting a dent reducing material, a hot melt adhesive film and a curing layer, wherein the dent reducing material is one of EVA, PC sheet, PPA and D30;

(3) Sequentially assembling the solidified layer, the ultra-high molecular weight polyethylene bulletproof curved plate, the hot melt adhesive film and the dent-reducing material, sealing, vacuumizing and performing heat sealing by a four-column hydraulic press;

(4) Spraying paint on the material after heat sealing, and air-drying and forming;

the four-column hydraulic machine has the following operation process:

raising the temperature and the pressure to 15-20Mpa and the temperature to 70-85 ℃;

maintaining the temperature and pressure for a period of time;

continuously heating and boosting, wherein the pressure reaches 20-25Mpa, and the temperature reaches 110-130 ℃;

maintaining the temperature and pressure for a period of time;

cooling to normal temperature and normal pressure.

2. The method for preparing the bulletproof plugboard according to claim 1, wherein the method for preparing the ultra-high molecular weight polyethylene bulletproof curved plate comprises the following steps: the surface density of the selection is 70-76g/m ² The ultra-high molecular weight polyethylene laid cloth is tiled, overlapped, typeset, cut, weighted and pressed.

3. The method for preparing the bulletproof plugboard according to claim 1, wherein the four-column hydraulic press in the step (3) operates as follows:

0-30min, pressure reaching 17Mpa, and temperature reaching 75-80deg.C;

31-45min, and maintaining the temperature and the pressure for 15 min;

45-55min, pressure up to 22Mpa, and temperature up to 115-125 ℃;

maintaining the temperature and pressure for 65 minutes for 56-120 minutes;

and (3) releasing the pressure after 121-180min, and reducing the temperature to normal temperature.

4. The method of producing a ballistic panel according to claim 2, wherein the ultra-high molecular weight polyethylene ballistic panel has an areal density of 13-13.5kg/m ² 。

5. A method of making a ballistic resistant panel according to any one of claims 1-3, wherein the hot melt adhesive film in step (2) is one of EVA, TPU and PO.

6. A method of producing a ballistic resistant panel according to any one of claims 1 to 3, wherein the cured layer in step (2) is one of aramid, glass or ultra high molecular weight polyethylene.

7. A method of making a ballistic resistant panel according to any one of claims 1-3, wherein the paint in step (4) is a black polyurea B component: black polyurea a component = 1.2:0.8.

8. the method for producing a bulletproof insert plate according to claim 7, wherein the nozzle diameter Φ1.2mm for spraying in the step (4) is 550 to 630mm.

9. The method for preparing the bulletproof plugboard according to claim 8, wherein the temperature of paint spraying in the step (4) is 65-75 ℃, and the air drying and standing molding time is 5-6 hours.

10. Ballistic panel produced by the process according to any one of claims 1-9, wherein the areal density of the panel is not more than 16kg/m ² The concave area of the 6-shot 56 type 7.62mm common bullet is not more than 25mm.