Bulletproof plugboard and preparation method thereof

Abstract

The present application relates to a kind of bulletproof plugboard and its preparation method, by simple and appropriate process, select suitable solidification layer, ultra-high molecular weight polyethylene bulletproof curved panel, hot melt adhesive film and reduce the recess material, sequentially assemble, four-column hydraulic press heat, spray paint, the surface density of the bulletproof plugboard prepared is not more than 16kg / m 2 , resist 6 launch 56 type 7.62mm normal bullet (steel core) The indentation is not more than 25mm.

Description

Technical Field

[0001] This invention belongs to the field of protective equipment technology, specifically relating to a bulletproof insert and its preparation method. Background Technology

[0002] Bulletproof inserts are protective devices capable of withstanding high-speed bullets or fragments, and are widely used in military, aerospace, and special materials fields. Traditional bulletproof inserts are mostly made of metal or ceramic materials, which offer good ballistic protection but are often heavy and easily damaged. Therefore, finding new lightweight materials has become a research hotspot in the field of bulletproof insert manufacturing. Patent CN202022496929.1 discloses a bulletproof structure comprising: a bulletproof layer, wherein the bulletproof layer includes a multi-layer ultra-high molecular weight polyethylene fiber woven structure, with the weaving direction of adjacent layers of the ultra-high molecular weight polyethylene fiber woven structure arranged at 90°, and the areal density of the bulletproof layer is 50 g / m³. 2 -60g / m 2 The ballistic layer includes an anti-dent layer disposed on the back surface of the ballistic layer, comprising a multi-layered microfiber three-dimensional woven structure; the final dent result of the second ballistic structure in the specification is 26.0 mm, and the theoretical areal density is 19.26 kg / m³. 2 Patent CN201910989828.7 discloses a manufacturing process for bulletproof inserts, including eight steps. It employs a four-column hydraulic press to apply a pressing pressure of 1.0MPa-1.5MPa to the composite plate, maintaining a temperature of 15℃-28℃ and humidity below 90% for 5-12 hours, resulting in a long preparation time. Therefore, bulletproof inserts produced by existing technologies either have an excessively high areal density (around 18kg / m³) 2 The above are either due to complex manufacturing processes and excessively long preparation times, making mass production impossible. Summary of the Invention

[0003] This invention provides a bulletproof insert and its preparation method to solve the technical problems of current bulletproof inserts, such as high surface density, deep indentation when resisting 6 Type 56 7.62mm ordinary bullets (steel core), and complex preparation process.

[0004] The content of this invention includes:

[0005] A method for preparing a bulletproof insert includes the following steps:

[0006] (1) Preparation of ultra-high molecular weight polyethylene bulletproof curved panels;

[0007] (2) Select an anti-sag material, a hot melt adhesive film, and a curing layer. The anti-sag material is one of EVA, PC sheet, PPA, and D30.

[0008] (3) After assembling the curing layer, ultra-high molecular weight polyethylene bulletproof curved panel, hot melt adhesive film and anti-dent material in sequence, seal, vacuum, and heat seal with a four-column hydraulic press;

[0009] (4) The heat-sealed material is sprayed with paint and air-dried to form a shape;

[0010] The operating process of the four-column hydraulic press is as follows:

[0011] Increase the temperature and pressure, reaching a pressure of 15-20 MPa and a temperature of 70-85℃;

[0012] Maintain the above temperature and pressure for a period of time;

[0013] Continue to increase the temperature and pressure, reaching a pressure of 20-25 MPa and a temperature of 110-130℃;

[0014] Maintain the above temperature and pressure for a period of time;

[0015] Cool down to room temperature and pressure.

[0016] Furthermore, the preparation method of the ultra-high molecular weight polyethylene bulletproof curved panel is as follows: selecting a surface density of 70-76 g / m². 2 Ultra-high molecular weight polyethylene nonwoven fabric is laid flat, overlapped, laid out, cut, weighted, and pressed.

[0017] Furthermore, the counterweight is achieved by selecting each piece of cut non-woven fabric, removing fabric samples with insects, impurities, defects, etc., and then stacking and piling the fabric samples according to the specified surface density.

[0018] Furthermore, the EVA is an ethylene-vinyl acetate copolymer; the PC sheet is a polycarbonate sheet; the PPA is polyphthalamide; and D30 is a polymeric gel material.

[0019] Furthermore, the operating process of the four-column hydraulic press in step (3) is as follows:

[0020] Within 0-30 minutes, the pressure reaches 17 MPa and the temperature reaches 75-80℃;

[0021] 31-45 minutes, maintain temperature and pressure for 15 minutes;

[0022] 45-55 minutes, pressure reaches 22 MPa, temperature reaches 115-125℃;

[0023] 56-120 min, maintain temperature and pressure for 65 minutes;

[0024] 121-180 minutes, release the pressure and lower the temperature to room temperature.

[0025] Furthermore, in the preparation method of the ultra-high molecular weight polyethylene bulletproof curved panel, the areal density of the ultra-high molecular weight polyethylene bulletproof curved panel is 13-13.5 kg / m³. 2 .

[0026] Furthermore, the hot melt adhesive film in step (2) is one of EVA, TPU and PO.

[0027] Furthermore, the main component of the PO hot melt adhesive film is polyolefin; the TPU hot melt adhesive, also known as TPU hot melt double-sided adhesive, is mainly composed of polyurethane; and the main component of the EVA hot melt adhesive film is vinyl acetate copolymer.

[0028] Furthermore, in step (2), the cured layer is one of aramid, glass fiber, or ultra-high molecular weight polyethylene fiber.

[0029] Furthermore, in step (4), the paint is black polyurea component B: black polyurea component A = 1.2: 0.8.

[0030] Furthermore, in step (4), the nozzle diameter for spraying is Ф1.2mm, and the spraying distance is 550~630mm.

[0031] Furthermore, in step (4), the paint spraying temperature is 65~75℃, and the air drying and settling time is 5~6 hours.

[0032] A bulletproof insert, the areal density of which is ≤16kg / m³ 2 It can withstand a dent of ≤25mm from six Type 56 7.62mm standard bullets.

[0033] The beneficial effects of this invention are:

[0034] (1) In terms of preparation process, this method is simple and easy to operate, has a short preparation time, high production efficiency, and can achieve mass production;

[0035] (2) Controlling the hot pressing temperature of the four-column hydraulic press during the preparation process, avoiding excessively high or low temperatures, can generally yield bulletproof inserts with good mechanical properties;

[0036] (3) The areal density of the bulletproof inserts shall not exceed 16 kg / m³. 2 (The areal density of bulletproof inserts made by ordinary methods is 18 kg / m³) 2 The above (referring to the GA141-2010 Level 5 standard) provides a dent of no more than 25mm when resisting six Type 56 7.62mm ordinary bullets (steel core), which is considered to be at an advanced level in China. Attached Figure Description

[0037] Figure 1This is a schematic diagram of the structure of the bulletproof insert of the present invention. 1 is the curing layer, 2 is the ultra-high molecular weight polyethylene bulletproof curved panel, 3 is the hot melt adhesive film, and 4 is the anti-dent material. Detailed Implementation

[0038] Example 1

[0039] (1) Preparation of ultra-high molecular weight polyethylene bulletproof curved panel

[0040] Selected surface density of 72 g / m 2 Ultra-high molecular weight polyethylene nonwoven fabric is laid on the workbench, requiring the fabric to be laid flat and each layer to overlap. Using clothing design software, the fabric is automatically laid out according to the size of the bulletproof inserts and then cut.

[0041] The cut material sheets are promptly transported to the counterweight chamber for counterweighting and pressing. The surface density of the ultra-high molecular weight polyethylene bulletproof curved panel is controlled within the range of 13-13.5 kg / m². 2 .

[0042] (2) Selection of anti-dent material, curing layer material and hot melt adhesive film

[0043] D30 material was selected as the anti-depression material;

[0044] Aramid material was selected as the curing layer;

[0045] TPU film was selected as the hot melt adhesive film.

[0046] (3) Enter the four-column hydraulic press for heat sealing

[0047] The curing layer, ultra-high molecular weight polyethylene bulletproof curved panel, hot melt adhesive film, and anti-dent material are arranged according to... Figure 1 The structure is assembled;

[0048] Then place it on the loading table, seal the assembled raw materials with a sealing bag, then perform a vacuuming 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.

[0049] The operating process of a four-column hydraulic press is as follows:

[0050] Within 0-30 minutes, the pressure reached 17 MPa and the temperature reached 75℃;

[0051] 31-45 minutes, maintain temperature and pressure for 15 minutes;

[0052] 45-55 minutes, the pressure reaches 22 MPa, and the temperature reaches 115℃;

[0053] 56-120 min, maintain temperature and pressure for 65 minutes;

[0054] After 121-180 minutes, release the pressure and lower the temperature to room temperature to obtain the semi-finished product.

[0055] (4) Bulletproof inserts are spray-coated and molded

[0056] Preparation: Paint (black polyurea component B): Hardener (black polyurea component A) = 1.2:0.8. Heat the paint to 65℃ using equipment and start spraying. Use a nozzle with a diameter of Ф1.2mm and a spraying distance of 600mm to evenly spray the surface of the semi-finished product. Finally, let it air dry and stand for 5 hours to obtain the bulletproof insert.

[0057] Example 2

[0058] PPA (poly(o-phthalamide)) was selected as the anti-depression material, and other aspects were the same as in Example 1.

[0059] Example 3

[0060] The operating process of a four-column hydraulic press is as follows:

[0061] Within 0-30 minutes, the pressure reaches 17 MPa and the temperature reaches 80℃;

[0062] 31-45 minutes, maintain temperature and pressure for 15 minutes;

[0063] 45-55 minutes, the pressure reaches 22 MPa, and the temperature reaches 125℃;

[0064] 56-120 min, maintain temperature and pressure for 65 minutes;

[0065] 121-180 min, release pressure, lower temperature to room temperature to obtain semi-finished product;

[0066] The rest is the same as in Example 1.

[0067] Comparative Example 1

[0068] The operating process of a four-column hydraulic press is as follows:

[0069] Within 0-30 minutes, the pressure reached 17 MPa and the temperature reached 110℃;

[0070] 31-45 minutes, maintain temperature and pressure for 15 minutes;

[0071] 45-55 minutes, the pressure reaches 22 MPa, and the temperature reaches 135℃;

[0072] 56-120 min, maintain temperature and pressure for 65 minutes;

[0073] 121-180 min, release pressure, lower temperature to room temperature to obtain semi-finished product;

[0074] The rest is the same as in Example 1.

[0075] Table 1 below shows the statistics of the surface density of the bulletproof inserts obtained in Examples 1-3 and Comparative Example 1, the number of bullets (steel core) that the inserts can withstand from Type 56 7.62mm ordinary bullets, and the dent distance.

[0076] Table 1. Test results of bulletproof inserts

[0077]

[0078] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0079] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A method for preparing a bulletproof insert, characterized in that, Includes the following steps: (1) Preparation of ultra-high molecular weight polyethylene bulletproof curved panels; (2) Select an anti-sag material, a hot melt adhesive film, and a curing layer. The anti-sag material is one of EVA, PC sheet, PPA, and D30. (3) After assembling the curing layer, ultra-high molecular weight polyethylene bulletproof curved panel, hot melt adhesive film and anti-dent material in sequence, seal, vacuum, and heat seal with a four-column hydraulic press; (4) The heat-sealed material is sprayed with paint and air-dried to form a shape; The operating process of the four-column hydraulic press in step (3) is as follows: Within 0-30 minutes, the pressure reaches 17 MPa and the temperature reaches 75-80℃; 31-45 minutes, maintain temperature and pressure for 15 minutes; 46-55 minutes, pressure reaches 22 MPa, temperature reaches 115-125℃; 56-120 min, maintain temperature and pressure for 65 minutes; 121-180 minutes, release the pressure and lower the temperature to room temperature; The preparation method of the ultra-high molecular weight polyethylene bulletproof curved panel is as follows: select panels with an areal density of 70-76 g / m². 2 Ultra-high molecular weight polyethylene nonwoven fabric, laid flat, overlapped, laid out, cut, weighted and pressed; In the preparation method of the ultra-high molecular weight polyethylene bulletproof curved panel, the areal density of the ultra-high molecular weight polyethylene bulletproof curved panel is 13-13.5 kg / m³. 2 ; The areal density of the bulletproof inserts produced by the above method is ≤16kg / m³. 2 It can withstand a dent of ≤25mm from six Type 56 7.62mm standard bullets.

2. The method for preparing the bulletproof insert as described in claim 1, characterized in that, In step (2), the hot melt adhesive film is one of EVA, TPU and PO.

3. The method for preparing the bulletproof insert as described in claim 1, characterized in that, In step (2), the cured layer is one of aramid, glass fiber or ultra-high molecular weight polyethylene fiber.

4. The method for preparing the bulletproof insert as described in claim 3, characterized in that, In step (4), the nozzle diameter for spraying is Ф1.2mm, and the spraying distance is 550~630mm.

5. The method for preparing the bulletproof insert as described in claim 4, characterized in that, In step (4), the paint spraying temperature is 65~75℃, and the air drying and settling time is 5~6 hours.

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