Polyethylene composite board protection structure and preparation method thereof
By installing polymer coating, random fiber layer and sealing layer in the polyethylene composite board, the problems of poor interlayer bonding force and reduced protection performance of PE fiberboard in the use of armored vehicles are solved, and higher bulletproof performance and environmental adaptability are achieved, and service life is extended.
Patent Information
- Application Number
- CN202510912288.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-03
- Publication Date
- 2025-08-01
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
PE fiberboard has poor bonding power between layers when used in armored vehicles, which is easy to crack in layers and has low bonding power with other materials, resulting in reduced protective performance and easy corrosion in humid environments, limiting its application in armored vehicles' bulletproof boards.
The polyethylene composite panel structure is adopted with four-sided polymer-coated polyethylene composite panel structure, and the coating is equipped with random fiber layer A, sealing layer and random fiber layer B to enhance overall strength and toughness, the sealing layer prevents corrosion, and the inner weft-free polyethylene layer provides bulletproof performance, and after the projectile is perforated, the bullet holes are filled through the fiber layer and sealing layer material to enhance deformation resistance and weather resistance.
It improves the bulletproof performance and environmental adaptability of polyethylene composite panels, extends service life, enhances the impact and weather resistance of armored vehicles, prevents moisture and air from entering, and improves the overall protective performance of composite panels.
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Figure CN120396476A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of armored bulletproof technology, and particularly relates to a polyethylene composite board protection structure and a preparation method thereof. Background Art
[0002] The PE fiber board is a fiber-reinforced composite material board made by heating and pressing multiple layers of ultra-high molecular weight polyethylene fiber UD cloth. It has excellent bulletproof performance and is widely used as the main material of bulletproof vests in the field of personal protection. Due to the poor interfacial bonding strength between the PE fiber board layers, it is prone to delamination and cracking during long-term use, reducing its protection performance. In addition, the bonding strength between the PE fiber board and other materials is low, making it difficult to bond. For the above reasons, its application in the external bulletproof board of armored vehicles is limited. To improve the environmental adaptability of the PE fiber board and its resistance to external force damage such as sand and stone impact during external installation, it is necessary to protect the PE fiber board and improve its adaptability for installation on vehicles. A feasible method is to spray an elastic polymer on the surface for protection. However, after being shot by an incoming bullet, the elastic polymer on the surface will surely be penetrated, and when the internal fiber board is exposed, it is equivalent to the armor plate directly contacting the air. In a humid environment, the substrate is prone to corrosion, and there is a greater risk of the substrate being immersed in water when fording. Summary of the Invention
[0003] Aiming at the problem that the substrate of the external PE fiber board of existing armored vehicles is damaged due to exposure after being shot, the present invention provides a polyethylene composite board protection structure, which is a cuboid structure, and polymer coatings are coated on all four sides. Inside the polymer coatings, there are successively a random fiber layer A, a sealing layer, a random fiber layer B, and a non-woven polyethylene layer.
[0004] In the polyethylene composite board protection structure of the present invention, the polymer coating is specifically one of a polyurea coating, a polyurethane coating, or an epoxy resin coating. Using a polymer coating with high elasticity and high strength can effectively prevent the impact damage of foreign objects such as sand and stone, and improve the environmental adaptability and installation adaptability of the non-woven polyethylene layer. The settings of the random fiber layer A and the random fiber layer B can enhance the overall strength of the composite board, increase the toughness of the composite board at the same time, and improve its anti-deformation ability when being impacted. The setting of the sealing layer can effectively isolate air and moisture, prevent problems such as corrosion and water immersion of the substrate during long-term use, and thus extend the service life of the composite board. The non-woven polyethylene layer, as the innermost layer of the composite board, can provide good bulletproof performance and ensure that the armored vehicle can effectively resist the shooting of incoming bullets when being attacked.
[0005] Specifically, the random fiber layer A and the random fiber layer B are independently selected from one of PE long fibers, PA long fibers, PET long fibers, carbon fiber long fibers or basalt long fibers; low-melting-point polymer powder is uniformly added to the random fiber layer A, and organotin catalyst is uniformly added to the random fiber layer B. The sealing layer is a high-density polyethylene bag filled with polyurethane prepolymer.
[0006] After the polyethylene composite board protection structure of the present invention is installed on the surface of the armored vehicle and a bullet hole is formed due to the invasion of a projectile, the random fiber layer A, the sealing layer and the random fiber layer B will also play a role in filling the bullet hole. The specific principle is as follows: The projectile penetrates through the polymer coating, the random fiber layer A, the sealing layer and the random fiber layer B, leaving a bullet hole on the unidirectional polyethylene layer, and the bullet hole may even extend to the substrate. First, the fibers in the random fiber layer A and the random fiber layer B will disperse in the bullet hole under the rotation of the projectile, and then the polyurethane prepolymer in the sealing layer slowly flows to fill the bullet hole. Since the surface temperature of the armored vehicle is relatively high during operation, the organotin catalyst in the random fiber layer B and the polyurethane prepolymer will undergo a catalytic reaction at the relatively high temperature on the surface of the armored vehicle, embedding the random fibers in the polyurethane elastomer, which is equivalent to generating a long-fiber polyurethane composite material in the bullet hole. This long-fiber polyurethane composite material has relatively high strength and toughness, can effectively enhance the strength around the bullet hole, prevent the bullet hole from expanding, and at the same time reduce the possibility of moisture and air entering the interior of the composite board through the bullet hole, further improving the weather resistance, service life of the composite board and the ability to resist secondary shooting.
[0007] The random fibers themselves have the problem of poor structural strength and easy deformation and collapse. In the present invention, adding powder particles to the random fiber layer A and the random fiber layer B can fill the gaps between the fibers, reduce the probability of collapse under stress, and can also increase the friction between the fibers and reduce the deformation caused by the movement of the fibers. In addition, the low-melting-point polymer powder added to the random fiber layer A will absorb heat and melt at a higher temperature of the armored vehicle, reducing the surface temperature of the armored vehicle to a certain extent. After solidifying at a slightly lower temperature, it can weld the long fibers of the random fiber layer A into a fiber mat, increasing the overall anti-bullet ability.
[0008] The second part of the present invention provides a preparation method for the polyethylene composite board protection structure, and the specific operations are as follows: 1) Prepare an open bag with the required thickness and size from a high-density polyethylene film, fill it with polyurethane prepolymer and then seal it to obtain the sealing layer; 2) Mix the random fiber filaments with low-melting-point polymer powder or organotin catalyst evenly and then fill them into a mold with the same size as the sealing layer obtained in step 1), spray water-based glue for shaping, and demold to obtain the random fiber layer A and the random fiber layer B; 3) Stack the polyethylene UD cloth into the required thickness, cut it according to the size of the sealing layer obtained in step 1), and stack and press it flat in sequence, which is the non-woven polyethylene layer. Uniformly coat the polymer on four sides, and after solidification, a polymer coating is formed, thus obtaining the polyethylene composite board protection structure.
[0009] The preparation method of the present invention is simple in operation, does not involve high-temperature heating and long and complex reaction steps, can flexibly prepare composite board protection structures of different shapes according to the sizes of different parts of the armored vehicle, and reduces the replacement difficulty and cost. Description of the Drawings
[0010] Figure 1 It is a schematic diagram of the polyethylene composite board protection structure of the present invention.
[0011] The numbers of each part are respectively: 1, polymer coating; 2, random fiber layer A; 3, sealing layer; 4, random fiber layer B; 5, non-woven polyethylene layer. Detailed Embodiments
[0012] The following describes the present invention in combination with examples. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. Example 1
[0013] A polyethylene composite board protection structure, as Figure 1 shown, the polyethylene composite board protection structure is a cuboid structure, and polymer coatings 1 are covered on all four sides. Inside the polymer coating 1 are a random fiber layer A 2, a sealing layer 3, a random fiber layer B 4, and a non-woven polyethylene layer 5 in sequence.
[0014] Among them, the polymer coating 1 is a polyurea coating; the random fiber layer A 2 is PE long fibers, and 8 wt% of PEG2000 powder is added therein; the sealing layer 3 is a high-density polyethylene bag filled with polyurethane prepolymer; the random fiber layer B 4 is PET long fibers, and 5 wt% of organotin catalyst is added therein.
[0015] The thicknesses of the polymer coating 1, the random fiber layer A 2, the sealing layer 3, the random fiber layer B 4, and the non-woven polyethylene layer 5 are 0.3 mm, 2.5 mm, 3 mm, 2.5 mm, and 15 mm respectively. Example 2
[0016] A polyethylene composite board protection structure, as Figure 1 shown, the polyethylene composite board protection structure is a cuboid structure, and polymer coatings 1 are covered on all four sides. Inside the polymer coating 1 are a random fiber layer A 2, a sealing layer 3, a random fiber layer B 4, and a non-woven polyethylene layer 5 in sequence.
[0017] Among them, the polymer coating 1 is a polyurethane coating; the random fiber layer A 2 is made of PET long fibers, and 10 wt% of PCL powder is added therein; the sealing layer 3 is a high-density polyethylene bag filled with polyurethane prepolymer; the random fiber layer B 4 is made of carbon fiber long fibers, and 8 wt% of organotin catalyst is added therein.
[0018] The thicknesses of the polymer coating 1, the random fiber layer A 2, the sealing layer 3, the random fiber layer B 4 and the unidirectional polyethylene layer 5 are 0.2 mm, 2 mm, 5 mm, 3 mm and 10 mm respectively. Example 3
[0019] A polyethylene composite board protection structure, as Figure 1 shown, the polyethylene composite board protection structure is a cuboid structure, and all four faces are coated with the polymer coating 1. Inside the polymer coating 1 are successively the random fiber layer A 2, the sealing layer 3, the random fiber layer B 4 and the unidirectional polyethylene layer 5.
[0020] Among them, the polymer coating 1 is an epoxy resin coating; the random fiber layer A 2 is made of PA66 long fibers, and 8 wt% of PEG2000 powder is added therein; the sealing layer 3 is a high-density polyethylene bag filled with polyurethane prepolymer; the random fiber layer B 4 is made of PA6 long fibers, and 6 wt% of organotin catalyst is added therein.
[0021] The thicknesses of the polymer coating 1, the random fiber layer A 2, the sealing layer 3, the random fiber layer B 4 and the unidirectional polyethylene layer 5 are 0.4 mm, 5 mm, 3 mm, 5 mm and 8 mm respectively.
[0022] The preparation methods of the polyethylene composite board protection structures of Examples 1 to 3 are as follows: 1) Prepare an open bag with a high-density polyethylene film to the required thickness and size, fill it with polyurethane prepolymer and then seal it to obtain the sealing layer 3; 2) Mix the random fiber filaments with low-melting-point polymer powder or organotin catalyst evenly and then fill them into a mold with the same size as the sealing layer 3 obtained in step 1), spray water-based acrylate emulsion glue for shaping, and demold to obtain the random fiber layer A 2 and the random fiber layer B 4; 3) Stack the polyethylene UD cloth to the required thickness, cut it according to the size of the sealing layer 3 obtained in step 1), and stack and press it flat in sequence to obtain the unidirectional polyethylene layer 5. Coat the polymer evenly on the four faces, and form the polymer coating 1 after solidification, thus obtaining the polyethylene composite board protection structure.
[0023] Comparative Examples 1 to 3 are respectively the polyethylene board protection structures after removing the sealing layer in the polyethylene composite board protection structures of Examples 1 to 3.
[0024] The protective structures obtained in Examples 1 to 3 and Comparative Examples 1 to 3 were respectively combined with 4.5-mm 6252 steel plates, and fired with 53-type 7.62-mm armor-piercing incendiary bullets at 100 meters at 0° at a rate of 1 shot per minute. The results are shown in Table 1. It can be seen from the data in Table 1 that the anti-ballistic performance was significantly improved after the sealing layer was set in Examples 1 to 3.
[0025] Table 1. Detection results of the shooting performance of the protective structures obtained in Examples 1 to 3 and Comparative Examples 1 to 3
[0026] The foregoing are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
Claims
1. A protection structure for a polyethylene composite board, characterized in that, The polyethylene composite board protection structure is a cuboid structure, and polymer coatings (1) are coated on all four faces. Inside the polymer coatings (1), there are in sequence a random fiber layer A (2), a sealing layer (3), a random fiber layer B (4), and a unidirectional polyethylene layer (5).
2. The polyethylene composite board protection structure according to claim 1, characterized in that, The polymer coating (1) is one of a polyurea coating, a polyurethane coating, or an epoxy resin coating.
3. The polyethylene composite board protection structure according to claim 1, characterized in that, The random fiber layer A (2) and the random fiber layer B (4) are independently selected from one of PE long fibers, PA long fibers, PET long fibers, carbon fiber long fibers, or basalt long fibers; low melting point polymer powder is uniformly added to the random fiber layer A (2), and organotin catalyst is uniformly added to the random fiber layer B (4).
4. The polyethylene composite board protection structure according to claim 1, characterized in that, The sealing layer (3) is a high-density polyethylene bag filled with polyurethane prepolymer.
5. A preparation method of the polyethylene composite board protection structure according to any one of claims 1 to 4, characterized in that, It includes the following steps: 1) Prepare an open bag with a high-density polyethylene film to the required thickness and size, fill it with polyurethane prepolymer and then seal it to obtain the sealing layer (3); 2) Mix random fiber filaments with low melting point polymer powder or organotin catalyst evenly respectively, then fill them into a mold with the same size as the sealing layer (3) obtained in step 1), spray water-based glue to shape, and demold to obtain the random fiber layer A (2) and the random fiber layer B (4); 3) Stack the polyethylene UD cloth to the required thickness, cut it according to the size of the sealing layer (3) obtained in step 1), and then stack and press it flat in sequence to obtain the unidirectional polyethylene layer (5). Uniformly coat the polymer on all four faces, and after solidification, form the polymer coating (1), thus obtaining the polyethylene composite board protection structure.