Bulletproof plugboard and preparation method thereof

Abstract

The invention relates to the technical field of protection equipment, and discloses a bulletproof plugboard and a preparation method thereof, the bulletproof plugboard comprises an internal structure and long fibers wound on the outer surface of the internal structure; the internal structure comprises a ceramic plate layer, an aramid sheet layer and a polyethylene plate layer which are sequentially arranged in the direction from the bullet facing surface to the bullet backing surface; the long fibers and the internal structure are bonded and fixed through an adhesive, and all layers of the internal structure are bonded and fixed through an adhesive. According to the bulletproof flashboard, the ceramic board layer, the aramid sheet layer and the polyethylene board layer are glued into a whole to serve as an internal structure of the bulletproof flashboard, and expansion of cracks of the ceramic board can be restrained to a certain extent after the bulletproof flashboard is bounced; the long fibers wrapping the outer surface of the internal structure can restrain separation of the ceramic plate layer and the polyethylene plate layer, the integrity of the internal structure is kept, the multiple resistance of the bulletproof plugboard can be improved, and the sinking resistance of the bulletproof plugboard can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of protective equipment, and in particular to a bulletproof insert plate and a preparation method thereof. Background Art

[0002] The whole plate bulletproof plug plate is a product made of a single piece of ceramic and ultra-high molecular weight polyethylene (PE) plate as the main bulletproof material. Compared with the spliced ​​bulletproof plug plate, the whole plate bulletproof plug plate has no ceramic splicing seam and has higher bulletproof reliability. The current whole plate bulletproof plug plate structure is mostly composed of panel layer / whole plate ceramic / support layer / PE layer / reducing concave sheet layer, and the layers are bonded with glue. This structure cannot effectively inhibit crack propagation. After being hit by multiple shots, it is easy to cause PE deformation and interlayer shrinkage, and the support stiffness of the ceramic is greatly reduced. In addition, the whole plate ceramic is easy to cause crack propagation and cross-cracks after being hit by bullets, resulting in a reduction in the ceramic area that effectively resists impact, and the ability to resist multiple shots is greatly reduced, even lower than that of the spliced ​​plug plate. Therefore, it is urgent to provide a whole plate bulletproof plug plate that can effectively inhibit crack propagation and improve the anti-multiple shot performance. Summary of the invention

[0003] In view of this, the present invention provides a bulletproof plug plate and a preparation method thereof to solve the problem that the existing whole-plate bulletproof plug plate cannot effectively suppress crack propagation, which easily leads to poor anti-multiple-shot performance of the bulletproof plug plate.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] In one aspect, the present invention provides a bulletproof insert, comprising an internal structure and long fibers wound around an outer surface of the internal structure;

[0006] From the direction of the anti-repellent surface to the anti-repellent surface, the internal structure includes a ceramic plate layer, an aramid sheet layer and a polyethylene plate layer arranged in sequence;

[0007] The long fibers and the internal structure are bonded and fixed by adhesive, and the layers of the internal structure are bonded and fixed by adhesive.

[0008] Preferably, the ceramic in the ceramic plate layer is boron carbide ceramic.

[0009] Preferably, the density of the boron carbide ceramic is 2.60-2.90 g / cm 3 , hardness ≥25GPa.

[0010] Preferably, the thickness of the ceramic plate layer is 8.3-11 mm.

[0011] Preferably, the thickness of the aramid sheet layer is ≥0.5 mm.

[0012] Preferably, the surface density of the polyethylene sheet layer is ≥10.5 kg / m 2 , thickness ≥10.8mm.

[0013] Preferably, the strength of the long fibers is ≥24 cN / dtex.

[0014] Preferably, the thickness of the long fibers wound around the outer surface of the internal structure is 0.1 to 0.3 mm.

[0015] Preferably, the long fibers include one or more of aramid fibers, polyimide fibers, and liquid crystal polymer (LCP) fibers.

[0016] Preferably, the adhesive is an adhesive film, and the adhesive film includes one or more of a polyolefin adhesive film and a thermoplastic polyurethane adhesive film.

[0017] Preferably, the surface density of the film is ≥100 g / m 2 , thickness ≥0.15mm.

[0018] Preferably, the winding includes circumferential winding and / or radial winding.

[0019] On the other hand, the present invention also provides a method for preparing the bulletproof insert as described in any one of the above, comprising the following steps:

[0020] (1) stacking a ceramic plate, an adhesive, an aramid sheet, an adhesive and a polyethylene plate in sequence, and performing a first hot pressing fixing process to obtain an internal structure;

[0021] (2) After the adhesive is attached to the surface of the internal structure, the long fibers are wound around it, and a second hot pressing and fixing treatment is performed to obtain a bulletproof insert.

[0022] Preferably, the procedures of the first heat pressing and fixing process and the second heat pressing and fixing process are independently as follows:

[0023]

[0024]

[0025] Among them, T 1 =70~90℃, T 2 =90~110℃.

[0026] The present invention provides a bulletproof insert plate and a preparation method thereof, which has the following beneficial effects compared with the prior art:

[0027] The present invention glues the ceramic plate layer, the aramid sheet layer and the polyethylene plate layer together as the internal structure of the bulletproof plug plate, wherein the aramid sheet layer supports the ceramic plate layer. Specifically, the bulletproof plug plate will cause the ceramic plate layer to break after being hit by a bullet, and the impact energy of the broken ceramic plate layer on the polyethylene plate layer is very large. At this time, the aramid sheet can absorb part of the energy of the ceramic breakage and support the ceramic, thereby inhibiting the expansion of the cracks in the ceramic plate after the bullet hit to a certain extent.

[0028] In addition, the long fibers coated on the outer surface of the internal structure can absorb the energy of the deformation of the polyethylene plate layer, reduce the deformation of the polyethylene plate layer and fix the polyethylene plate layer tightly in the long fibers, inhibit the separation of the ceramic plate layer and the polyethylene plate layer, and maintain the integrity of the internal structure, which can not only improve the anti-multiple-shot performance of the bulletproof plug, but also improve the anti-dent ability of the bulletproof plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the internal structure of the bulletproof insert of the present invention;

[0031] Figure 2 It is a schematic diagram of the long fibers of the present invention being wound around the outer surface of the internal structure.

[0032] In the figure:

[0033] 10 is an internal structure, 11 is a ceramic plate layer, 12 is an aramid sheet layer, 13 is a polyethylene plate layer, and 20 is a long fiber. DETAILED DESCRIPTION

[0034] The present invention will be described below by specific examples, and it will be appreciated by those skilled in the art that the following specific examples are only for illustrative purposes, and do not limit the scope of the present invention in any way. In addition, in the following examples, unless otherwise specified, the reagents and equipment used are all commercially available. If in the following examples, specific treatment conditions and treatment methods are not clearly described, then conditions and methods known in the art can be used to process.

[0035] In one aspect of the present invention, the present invention provides a bulletproof insert, comprising an internal structure 10 and long fibers 20 wound around the outer surface of the internal structure 10; Figure 1As shown, in the direction from the bullet-facing surface to the bullet-backing surface, the internal structure 10 includes a ceramic plate layer 11, an aramid sheet layer 12, and a polyethylene plate layer 13 arranged in sequence; the long fibers 20 and the internal structure 10 are adhesively fixed through an adhesive, and each layer of the internal structure 10 is adhesively fixed through an adhesive.

[0036] In the present invention, the ceramic plate layer 11, the aramid sheet layer 12, and the polyethylene plate layer 13 are glued together as the internal structure 10 of the bulletproof insert plate, and the aramid sheet layer 12 plays a supporting role for the ceramic plate layer 11. Specifically, after the bulletproof insert plate is struck by a bullet, the ceramic plate layer 11 will crack, and the impact energy of the cracked ceramic plate layer 11 on the polyethylene plate layer 13 is very large. At this time, the aramid sheet can absorb part of the energy of the ceramic fragmentation and support the ceramic, thereby suppressing the expansion of the cracks in the ceramic plate to a certain extent after being struck by a bullet.

[0037] In addition, the long fibers 20 coated on the outer surface of the internal structure 10 can absorb the energy of the deformation of the polyethylene plate layer 13, reduce the deformation of the polyethylene plate layer 13, and firmly fix the polyethylene plate layer 13 within the long fibers 20, suppressing the separation between the ceramic plate layer 11 and the polyethylene plate layer 13, and maintaining the integrity of the internal structure 10, which can not only improve the multi-shot resistance performance of the bulletproof insert plate, but also improve the anti-dent ability of the bulletproof insert plate.

[0038] In some embodiments of the present invention, the ceramic plate layer 11 is a monolithic boron carbide ceramic, and the density of the boron carbide ceramic is 2.60 - 2.90 g / cm 3 , the hardness ≥ 25 GPa; the thickness of the ceramic plate layer 11 is 8.3 - 11 mm, for example, it can be 8.3 mm, 9 mm, 10 mm, 11 mm, etc. The present invention uses boron carbide ceramic as the ceramic plate layer 11. Compared with silicon carbide ceramic, the density of boron carbide ceramic is lower. Under the same bulletproof ability, boron carbide ceramic is lighter than silicon carbide ceramic, which helps to reduce the weight of the equipment and improve the mobility.

[0039] In some embodiments of the present invention, the thickness of the aramid sheet layer 12 ≥ 0.5 mm, for example, it can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc. By limiting the thickness of the aramid sheet layer 12, rigid support can be provided for the ceramic, reducing the impact of ceramic fragments on the subsequent polyethylene plate layer 13. The present invention does not specifically limit the specific type of the aramid sheet, which can be obtained by market purchase. The aramid sheet in the specific embodiment is purchased from Zhonglan Chenguang Research and Design Institute Co., Ltd.

[0040] In some embodiments of the present invention, the areal density of the polyethylene plate layer 13 ≥ 10.5 kg / m 2, with a thickness of ≥10.8 mm. By limiting the areal density and thickness of the polyethylene plate layer 13, the depression at the bullet impact position of the bulletproof plate can be reduced, and the reliability of the bulletproof plate against multiple strikes can be improved.

[0041] In some embodiments of the present invention, the long fibers 20 include one or more of aramid fibers, polyimide fibers, and liquid crystal polymer (LCP) fibers. The strength of the long fibers 20 is ≥24 cN / dtex, and the thickness of the long fibers 20 wrapped around the outer surface of the internal structure is 0.1 - 0.3 mm, for example, it can be 0.1 mm, 0.2 mm, 0.3 mm, etc. By limiting the strength and wrapping thickness of the long fibers 20, the propagation of ceramic cracks can be inhibited, the interlayer shrinkage deformation of the polyethylene plate can be restricted, the separation between the ceramic and the polyethylene plate can be limited, and the depression at the bullet impact position can be reduced.

[0042] In some embodiments of the present invention, the adhesive is a film, and the film includes one or more of polyolefin film and thermoplastic polyurethane film. The areal density of the film is ≥100 g / m 2 , and the thickness is ≥0.15 mm. By limiting the type, areal density, and thickness of the film, the bonding strength between the layers of the bulletproof plate can be ensured.

[0043] In some embodiments of the present invention, as Figure 2 shown, the winding includes circumferential winding and / or radial winding, where the 0° direction is circumferential winding and the 90° direction is radial winding. Specifically, the winding can be circumferential winding, can be radial winding, or can be a combination of circumferential winding and radial winding. For example, after circumferentially winding the internal structure 10, radial winding is carried out, or after radially winding the internal structure 10, circumferential winding is carried out.

[0044] In some embodiments of the present invention, the spacing of the long fibers 20 during winding is ≤1 mm, and it is preferred that the adjacent long fibers 20 are in close contact. There is no special limitation on this, and it can be adjusted according to the actual situation. It can be understood that during the winding process, the smaller the spacing between the adjacent long fibers 20, the better the wrapping property for the internal structure 10. After the bulletproof plate is struck by a bullet, it can better inhibit the separation of the ceramic plate layer 11 and the polyethylene plate layer 13, maintain the integrity of the internal structure 10, and improve the anti-multiple-strike performance.

[0045] On the other hand of the present invention, the present invention also provides a preparation method for the bulletproof plate according to any one of the above, including the following steps:

[0046] (1) Stack the ceramic plate, adhesive, aramid sheet, adhesive, and polyethylene plate in sequence, and perform the first hot pressing and fixing treatment to obtain the internal structure;

[0047] (2) After the adhesive is attached to the surface of the internal structure, the long fibers are wound around it, and a second hot pressing and fixing treatment is performed to obtain a bulletproof insert.

[0048] In the present invention, firstly, the ceramic plate, adhesive, aramid sheet, adhesive and polyethylene plate are stacked in sequence and subjected to a first hot pressing fixing treatment to obtain an internal structure.

[0049] In some embodiments of the present invention, when stacked in sequence, ensure that the edges of the ceramic plate, adhesive, aramid sheet, adhesive and polyethylene plate are aligned according to a set shape, which can be a rectangle, trapezoid or other polygonal shape, and the shape can be set according to actual conditions.

[0050] In some embodiments of the present invention, each layer is stacked in sequence and placed in a vacuum bag, and the vacuum is evacuated to -0.05 to -0.1 MPa, and then the first hot pressing fixation treatment is performed, and the bag is taken out after the treatment is completed to obtain an internal structure. The first hot pressing fixation process is performed in an autoclave, and the procedure of the first hot pressing fixation process is shown in Table 1:

[0051] Table 1

[0052] Program steps temperature Pressure / MPa Vacuum value / MPa Time / min 1 <![CDATA[The room temperature rises to T 1 > 0.05～0.1 -0.05～-0.1 30～60 2 <![CDATA[T 1 Up to T 2 ]]> 0.3～0.7 -0.05～-0.1 60～90 3 <![CDATA[T 2 ]]> 0.7～1.0 -0.05～-0.1 30～60 4 <![CDATA[T 2 ]]> ≥1.5 -0.05～-0.1 30～60 5 <![CDATA[T 2 Cool to room temperature]]> ≥1.5 -0.05～-0.1 /

[0053] It should be noted that the process step 1: under the conditions of pressure of 0.05~0.1MPa and vacuum value of -0.05~-0.1MPa, the temperature is raised from room temperature to T 1 Then keep the temperature constant for 30 to 60 minutes; process step 2: under the conditions of pressure of 0.3 to 0.7 MPa and vacuum value of -0.05 to -0.1 MPa, the temperature is increased from T 1 Up to T 2 Then keep the temperature constant for 60 to 90 minutes; Procedure step 3: Under the conditions of pressure of 0.7 to 1.0 MPa and vacuum value of -0.05 to -0.1 MPa, at T 2 Keep the temperature constant for 30 to 60 minutes at T 2 Keep the temperature constant for 30 to 60 minutes; Procedure step 5: Under the conditions of pressure ≥1.5MPa and vacuum value -0.05 to -0.1MPa, 2 Cool naturally to room temperature.

[0054] In the above table, T 1 =70~90℃, T 2 =90~110℃, T 1 For example, it can be 70°C, 75°C, 80°C, 85°C, 90°C, etc. 2For example, it can be 90°C, 95°C, 100°C, 105°C, 110°C, etc.; the pressure of program step pressure 1 can be, for example, 0.05MPa, 0.08MPa, 0.1MPa, etc., the vacuum value can be, for example, -0.05MPa, -0.08MPa, -0.1MPa, etc., and the constant temperature insulation time can be, for example, 30min, 40min, 50min, 60min, etc.; the pressure of program step pressure 2 can be, for example, 0.3MPa, 0.4MPa, 0.5MPa, 0.6MPa, 0.7MPa, etc., the vacuum value can be, for example, -0.05MPa, -0.08MPa, -0.1MPa, etc., and the constant temperature insulation time can be, for example, 60min, 70min, 80min, etc. 0min, 90min, etc.; the pressure of program step pressure 3 can be, for example, 0.7MPa, 0.8MPa, 0.9MPa, 1.0MPa, etc., the vacuum value can be, for example, -0.05MPa, -0.08MPa, -0.1MPa, etc., and the constant temperature insulation time can be, for example, 30min, 40min, 50min, 60min, etc.; the vacuum value of program step pressure 4 can be, for example, -0.05MPa, -0.08MPa, -0.1MPa, etc., and the constant temperature insulation time can be, for example, 30min, 40min, 50min, 60min, etc.; the vacuum value of program step pressure 5 can be, for example, -0.05MPa, -0.08MPa, -0.1MPa, etc.

[0055] In the present invention, after the internal structure is obtained, an adhesive is attached to the surface of the internal structure and then long fibers are wound around it, and a second hot pressing and fixing treatment is performed to obtain a bulletproof insert.

[0056] In some embodiments of the present invention, after the winding is completed, the internal structure wound with the long fibers is placed in a vacuum bag, evacuated to -0.05 to -0.1 MPa, and then subjected to a second hot pressing fixation treatment, and taken out after the treatment is completed to obtain a bulletproof insert. The second hot pressing fixation treatment process is the same as the first hot pressing fixation treatment process, and will not be repeated here.

[0057] It should be noted that the winding method is the aforementioned circumferential winding and / or radial winding, which will not be described in detail here.

[0058] In the present invention, each layer of the internal structure and between the internal structure and the long fibers are subjected to hot pressing and fixing treatment using a set procedure. The adhesive film is fully melted during the hot pressing and fixing process. Increasing the pressure in the autoclave can allow the adhesive film to infiltrate the surface of each structure, thereby improving the bonding effect.

[0059] The technical solutions in the present invention will be described clearly and completely below in conjunction with specific embodiments. The embodiments of the present application are only used as examples, and all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0060] Example 1

[0061] The present embodiment provides a bulletproof insert plate, comprising an internal structure and long fibers wound around the outer surface of the internal structure, wherein the thickness of the long fibers wrapped around the outer surface of the internal structure is 0.2 mm; from the bullet-facing surface to the back-bounce surface, the internal structure comprises a ceramic plate layer, an aramid sheet layer, and a polyethylene plate layer arranged in sequence; the long fibers and the internal structure are bonded and fixed by an adhesive, and the layers of the internal structure are bonded and fixed by an adhesive.

[0062] Among them, the ceramic plate layer has a density of 2.60g / cm 3 , boron carbide ceramic with a hardness of 28GPa and a thickness of 9.0mm; the thickness of the aramid layer is 0.5mm; the surface density of the polyethylene layer is 10.5kg / m 2 , thickness is 10.8mm; the long fiber is aramid fiber with a strength of 24cN / dtex; the adhesive is a surface density of 100g / m 2 , thermoplastic polyurethane film with a thickness of 0.15mm.

[0063] The preparation method of the bulletproof insert is as follows:

[0064] (1) stacking the ceramic plate, adhesive, aramid sheet, adhesive and polyethylene plate in order, placing them in a vacuum bag after ensuring that the edge shapes are aligned, evacuating to -0.1 MPa and placing the whole in an autoclave, performing the first hot pressing and fixing treatment according to the set program to obtain the internal structure;

[0065] (2) After the adhesive is attached to the surface of the internal structure, the long fibers are wound around it, and after the winding is completed, it is placed in a vacuum bag, and after the vacuum is evacuated to -0.1 MPa, the whole is placed in an autoclave, and a second hot pressing and fixing treatment is performed according to the set program, and the bulletproof insert is taken out.

[0066] The winding process is to firstly perform circumferential winding on the internal structure, and then perform radial winding after the circumferential winding is completed; the procedures of the first hot pressing and fixing treatment are the same as those of the second hot pressing and fixing treatment, as shown in Table 2:

[0067] Table 2

[0068] Program steps temperature Pressure / MPa Vacuum value / MPa Time / min 1 Room temperature rises to 70℃ 0.1 -0.1 30 2 70℃ to 110℃ 0.7 -0.1 60 3 110℃ 0.7 -0.1 30 4 110℃ 1.5 -0.1 30 5 110℃ to room temperature 1.5 -0.1 /

[0069] Example 2

[0070] The present embodiment provides a bulletproof insert plate, comprising an internal structure and long fibers wound around the outer surface of the internal structure, wherein the thickness of the long fibers wrapped around the outer surface of the internal structure is 0.2 mm; from the bullet-facing surface to the back-bounce surface, the internal structure comprises a ceramic plate layer, an aramid sheet layer, and a polyethylene plate layer arranged in sequence; the long fibers and the internal structure are bonded and fixed by an adhesive, and the layers of the internal structure are bonded and fixed by an adhesive.

[0071] Among them, the ceramic plate layer has a density of 2.90g / cm 3 , boron carbide ceramic with a hardness of 25GPa and a thickness of 8.3mm; the thickness of the aramid layer is 1.0mm; the surface density of the polyethylene layer is 10.6kg / m 2 , thickness is 11mm; the long fiber is aramid fiber with a strength of 28.5cN / dtex; the adhesive is a surface density of 110g / m 2 , polyolefin film with a thickness of 0.2mm.

[0072] The preparation method of the bulletproof insert is basically the same as that of Example 1, the only difference being that the procedures of the first hot pressing and fixing treatment and the second hot pressing and fixing treatment are different, as shown in Table 3:

[0073] Table 3

[0074] Program steps temperature Pressure / MPa Vacuum value / MPa Time / min 1 Room temperature rises to 80℃ 0.1 -0.05 30 2 80℃ to 100℃ 0.7 -0.05 60 3 100℃ 0.7 -0.05 30 4 100℃ 2.1 -0.05 30 5 100℃ to room temperature 2.1 -0.05 /

[0075] Example 3

[0076] The present embodiment provides a bulletproof insert plate, comprising an internal structure and long fibers wound around the outer surface of the internal structure, wherein the thickness of the long fibers wrapped around the outer surface of the internal structure is 0.2 mm; from the bullet-facing surface to the back-bounce surface, the internal structure comprises a ceramic plate layer, an aramid sheet layer, and a polyethylene plate layer arranged in sequence; the long fibers and the internal structure are bonded and fixed by an adhesive, and the layers of the internal structure are bonded and fixed by an adhesive.

[0077] Among them, the ceramic plate layer has a density of 2.75g / cm 3 , boron carbide ceramic with a hardness of 27GPa and a thickness of 8.5mm; the thickness of the aramid layer is 0.8mm; the surface density of the polyethylene layer is 10.6kg / m 2 , thickness is 11mm; the long fiber is aramid fiber with a strength of 28.5cN / dtex; the adhesive is a surface density of 110g / m 2 , thermoplastic polyurethane film with a thickness of 0.22mm.

[0078] The preparation method of the bulletproof insert is basically the same as that of Example 1, the only difference being that the procedures of the first hot pressing and fixing treatment and the second hot pressing and fixing treatment are different, as shown in Table 4:

[0079] Table 4

[0080]

[0081]

[0082] Comparative Example 1

[0083] This comparative example provides a bulletproof insert plate. Compared with Example 1, the outer surface of the internal structure is not wrapped with long fibers, but is covered with a concave-reducing material.

[0084] The bulletproof insert comprises an internal structure and a dent-reducing material coated on the outer surface of the internal structure. From the bullet-facing surface to the bullet-proof surface, the internal structure comprises an aramid cloth layer, a ceramic plate layer, an aramid cloth layer and a polyethylene plate layer arranged in sequence. The dent-reducing material and the internal structure are fixed by double-sided tape, and the layers of the internal structure are fixed by adhesive.

[0085] Among them, the ceramic plate layer has a density of 2.60g / cm 3 , boron carbide ceramic with a hardness of 28GPa and a thickness of 9.0mm; the thickness of each aramid cloth layer is 0.5mm; the surface density of the polyethylene sheet layer is 10.5kg / m 2 , thickness is 10.8mm; the adhesive has a surface density of 100g / m 2 , a thermoplastic polyurethane film with a thickness of 0.15 mm; the dent-reducing material is polyurea with a thickness of 0.5 mm.

[0086] The preparation method of the bulletproof insert is as follows:

[0087] (1) stacking aramid cloth, adhesive, ceramic plate, adhesive, aramid cloth, adhesive and polyethylene plate in order, placing them in a vacuum bag after ensuring that the edge shapes are aligned, evacuating to -0.1 MPa and placing the whole in an autoclave, and performing hot pressing and fixing treatment according to the procedure set in Example 1 to obtain an internal structure;

[0088] (2) Spraying a concave-reducing material on the surface of the internal structure to obtain a bulletproof insert.

[0089] Comparative Example 2

[0090] This comparative example provides a bulletproof insert plate. Compared with Example 2, the outer surface of the internal structure is not wrapped with long fibers, but is covered with a concave-reducing material.

[0091] The bulletproof insert comprises an internal structure and a dent-reducing material coated on the outer surface of the internal structure. From the bullet-facing surface to the bullet-proof surface, the internal structure comprises an aramid cloth layer, a ceramic plate layer, an aramid cloth layer and a polyethylene plate layer arranged in sequence. The dent-reducing material and the internal structure are fixed by double-sided tape, and the layers of the internal structure are fixed by adhesive.

[0092] Among them, the ceramic plate layer has a density of 2.90g / cm 3 , boron carbide ceramic with a hardness of 25GPa and a thickness of 8.3mm; the thickness of each aramid cloth layer is 1.0mm; the surface density of the polyethylene sheet layer is 10.6kg / m 2 , thickness is 11mm; the adhesive has a surface density of 110g / m 2 , polyolefin film with a thickness of 0.2mm; the concave reduction material is polyurea with a thickness of 0.5mm.

[0093] The preparation method of the bulletproof insert is as follows:

[0094] (1) stacking aramid cloth, adhesive, ceramic plate, adhesive, aramid cloth, adhesive and polyethylene plate in order, placing them in a vacuum bag after ensuring that the edge shapes are aligned, evacuating to -0.1 MPa and placing the whole in an autoclave, and performing hot pressing and fixing treatment according to the procedure set in Example 2 to obtain an internal structure;

[0095] (2) Spraying a concave-reducing material on the surface of the internal structure to obtain a bulletproof insert.

[0096] Comparative Example 3

[0097] This comparative example provides a bulletproof insert plate. Compared with Example 3, the outer surface of the internal structure is not wrapped with long fibers, but is covered with a concave-reducing material.

[0098] The bulletproof insert comprises an internal structure and a dent-reducing material coated on the outer surface of the internal structure. From the bullet-facing surface to the bullet-proof surface, the internal structure comprises an aramid cloth layer, a ceramic plate layer, an aramid cloth layer and a polyethylene plate layer arranged in sequence. The dent-reducing material and the internal structure are fixed by double-sided tape, and the layers of the internal structure are fixed by adhesive.

[0099] Among them, the ceramic plate layer has a density of 2.75g / cm 3 , boron carbide ceramic with a hardness of 27GPa and a thickness of 8.5mm; the thickness of the aramid layer is 0.8mm; the surface density of the polyethylene layer is 10.6kg / m 2 , thickness is 11mm; the adhesive has a surface density of 110g / m 2 , a thermoplastic polyurethane film with a thickness of 0.22 mm, and the concave reduction material is a polyurea with a thickness of 0.5 mm.

[0100] The preparation method of the bulletproof insert is as follows:

[0101] (1) stacking aramid cloth, adhesive, ceramic plate, adhesive, aramid cloth, adhesive and polyethylene plate in order, placing them in a vacuum bag after ensuring that the edge shapes are aligned, evacuating to -0.1 MPa and placing the whole in an autoclave, and performing hot pressing and fixing treatment according to the procedure set in Example 3 to obtain an internal structure;

[0102] (2) Spraying the concave-reducing material on the surface of the internal structure to obtain a bulletproof insert.

[0103] Comparative Example 4

[0104] This comparative example is basically the same as Example 1, and the only difference is that the bulletproof insert plate does not involve an aramid sheet layer, that is, the internal structure includes a ceramic sheet layer and a polyethylene sheet layer arranged in sequence.

[0105] Comparative Example 5

[0106] This comparative example is basically the same as Example 1, with the only difference being that the aramid sheet layer is replaced with aramid cloth (purchased from the market) having a thickness of 0.5 mm.

[0107] The weight, surface density and anti-multiple-shot performance of the bulletproof plates prepared in Examples 1-3 and Comparative Examples 1-5 were tested, and the results are shown in Table 5. The anti-multiple-shot performance test was conducted in accordance with the NIJ0101.06 standard, with a distance of 15 m and a bullet type of 7.62×54 mm armor-piercing incendiary bullet.

[0108] Table 5

[0109]

[0110]

[0111] It can be seen from Table 5 that the bulletproof plug plate of the present invention can effectively inhibit the expansion of cracks in the ceramic plate after bullet impact through the prestressing effect of the long fibers. At the same time, with the help of the characteristic that the long fibers can absorb the deformation energy of the polyethylene plate, the deformation of the polyethylene plate is reduced and the polyethylene plate is tightly fixed in the internal structure, the separation of the ceramic plate layer and the polyethylene plate layer is avoided, and the anti-multiple-shot performance of the product is improved; in addition, although the bulletproof plug plate of the present invention does not use a dent-reducing material, it has good dent resistance and effectively reduces the weight of the product, and has the characteristics of lightweight.

[0112] In addition, it can be concluded from Example 1 and Comparative Examples 4-5 that the anti-multiple-incidence performance of the product can be effectively improved by providing an aramid sheet layer between the ceramic plate layer and the polyethylene plate layer.

[0113] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A bulletproof insert, characterized in that: comprising an internal structure and long fibers wound around an outer surface of the internal structure; From the direction of the anti-repellent surface to the anti-repellent surface, the internal structure includes a ceramic plate layer, an aramid sheet layer and a polyethylene plate layer arranged in sequence; The long fibers and the internal structure are bonded and fixed by adhesive, and the layers of the internal structure are bonded and fixed by adhesive.

2. The bulletproof insert according to claim 1, characterized in that: The ceramic in the ceramic plate layer is boron carbide ceramic; The density of the boron carbide ceramic is 2.60-2.90 g / cm 3 , hardness ≥ 25GPa; The thickness of the ceramic plate layer is 8.3-11 mm.

3. The bulletproof insert according to claim 1, characterized in that: The thickness of the aramid sheet layer is ≥0.5 mm.

4. The bulletproof insert according to claim 1, characterized in that: The surface density of the polyethylene sheet layer is ≥10.5kg / m 2 , thickness ≥10.8mm.

5. The bulletproof insert according to claim 1, characterized in that: The strength of the long fiber is ≥24 cN / dtex; The thickness of the long fibers wound around the outer surface of the internal structure is 0.1 to 0.3 mm.

6. The bulletproof insert according to claim 1, characterized in that: The long fibers include one or more of aramid fibers, polyimide fibers, and liquid crystal polymer fibers.

7. The bulletproof insert according to claim 1, characterized in that: The adhesive is a film, and the film includes one or more of a polyolefin film and a thermoplastic polyurethane film; The surface density of the film is ≥100g / m 2 , thickness ≥0.15mm.

8. The bulletproof insert according to any one of claims 1 to 7, characterized in that: The winding includes circumferential winding and / or radial winding.

9. A method for preparing the bulletproof insert according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) stacking a ceramic plate, an adhesive, an aramid sheet, an adhesive and a polyethylene plate in sequence, and performing a first hot pressing fixing process to obtain an internal structure; (2) After the adhesive is attached to the surface of the internal structure, the long fibers are wound around it, and a second hot pressing and fixing treatment is performed to obtain a bulletproof insert.

10. The method for preparing a bulletproof insert according to claim 9, characterized in that: The procedures of the first heat pressing and fixing process and the second heat pressing and fixing process are independently performed according to the following procedures: Among them, T1=70~90℃, T2=90~110℃.

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