Spliced bulletproof plug board and preparation method thereof

Abstract

The invention relates to the technical field of protection equipment, and discloses a spliced bulletproof plugboard and a preparation method thereof.The spliced bulletproof plugboard comprises a first aramid sheet layer, a ceramic plate layer, a second aramid sheet layer and a polyethylene plate layer which are sequentially arranged in the direction from a bullet facing face to a bullet backing face; the ceramic plate layer comprises a ceramic plate and a long fiber layer circumferentially wrapping the side face of the ceramic plate, and the ceramic plate is formed by bonding and splicing a plurality of ceramic blocks. According to the invention, the plurality of ceramic blocks are bonded and spliced into the ceramic plate, and meanwhile, the circumferential side edge of the ceramic plate is wrapped by the long fiber layer to form circumferential constraint, so that the constraint rigidity between the spliced ceramic blocks can be effectively improved, and further, the ceramic close to a striking point is effectively prevented from shifting or being separated from the adjacent layer; the multiple resistance and the side edge protection performance of the bulletproof inserting plate are improved, and deformation and sinking at the moment of bouncing are reduced.

Description

Technical Field

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

[0002] Spliced bulletproof plates usually involve the use of spliced ceramics. The circumferential constraint on the side of the spliced ceramics is insufficient, which easily causes the ceramics near the bullet impact point to shift or separate from its adjacent layer, affecting the anti-multiple impact performance and side protection performance of the bulletproof plate, and the deformation and depression are too large at the moment of bullet impact. Therefore, how to improve the circumferential binding force on the side of the spliced ceramics is an urgent problem to be solved. Summary of the Invention

[0003] In view of this, the present invention provides a spliced bulletproof plate and a preparation method thereof to solve the problem that the circumferential binding force on the side of the spliced ceramics of the existing spliced bulletproof plate is insufficient, resulting in poor protection performance of the bulletproof plate.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] On the one hand, the present invention provides a spliced bulletproof plate. In the direction from the bullet-facing surface to the bullet-backing surface, the spliced bulletproof plate includes a first aramid sheet layer, a ceramic plate layer, a second aramid sheet layer, and a polyethylene plate layer arranged in sequence;

[0006] The ceramic plate layer includes a ceramic plate and a long fiber layer circumferentially wrapped around the side of the ceramic plate, and the ceramic plate is formed by bonding and splicing multiple ceramic pieces.

[0007] Preferably, the thicknesses of the first aramid sheet layer and the second aramid sheet layer are each independently ≥ 0.5 mm.

[0008] Preferably, the densities of the first aramid sheet layer and the second aramid sheet layer are each independently 1.35 - 1.50 g / cm 3 .

[0009] Preferably, the aramid sheets in the first aramid sheet layer and the second aramid sheet layer are each independently selected from epoxy resin aramid sheets or polycarbonate resin aramid sheets.

[0010] Preferably, the thickness of the ceramic plate layer is ≥ 9.5 mm.

[0011] Preferably, the ceramic in the ceramic plate layer is boron carbide ceramic and / or silicon carbide ceramic, and the hardness of the ceramic is ≥ 23 GPa.

[0012] Preferably, the density of the boron carbide ceramic is ≥ 2.52 g / cm 3 .

[0013] Preferably, the density of the silicon carbide ceramic is ≥ 3.13 g / cm 3 .

[0014] Preferably, the areal density of the polyethylene sheet layer is ≥ 10.5 kg / m 2 , and the thickness is ≥ 10.8 mm.

[0015] Preferably, the long fiber layer is formed by winding at least one layer of long fibers circumferentially around the side of the ceramic plate, and the thickness of the long fiber layer is 0.2 - 0.4 mm.

[0016] Preferably, the thickness of the long fiber wound around the side of the ceramic plate is 0.2 - 0.4 mm.

[0017] Preferably, the long fiber includes one or more of aramid fiber, polyimide fiber, and liquid crystal polymer fiber.

[0018] Preferably, multiple pieces of the ceramic are bonded by a resin adhesive to form a ceramic plate.

[0019] Preferably, the viscosity of the resin adhesive is ≤ 1 Pa·s, and the curing temperature is ≥ 80 °C.

[0020] Preferably, the first aramid sheet layer, the ceramic plate layer, the second aramid sheet layer, and the polyethylene sheet layer are all fixed by a film adhesive.

[0021] Preferably, the film adhesive includes one or more of polyolefin film adhesive and thermoplastic polyurethane film adhesive.

[0022] Preferably, the areal density of the film adhesive is ≥ 100 g / m 2 , and the thickness is ≥ 0.15 mm.

[0023] Preferably, a protective layer is provided on the outer periphery of the spliced bulletproof insert plate.

[0024] On the other hand, the present invention also provides a method for preparing a bulletproof insert plate, including the following steps:

[0025] (1) Splicing and fixing multiple pieces of ceramic on a substrate according to a preset shape to obtain a ceramic plate precursor;

[0026] (2) Winding long fibers circumferentially around the side of the ceramic plate precursor, then impregnating an adhesive into the splicing seams of the ceramic plate precursor, and separating the substrate after curing to obtain a ceramic plate;

[0027] (3) Stacking the first aramid sheet, the ceramic plate, the second aramid sheet, and the polyethylene sheet in sequence and arranging a film adhesive between each layer, and then performing a hot pressing and fixing treatment to obtain a bulletproof insert plate.

[0028] Preferably, the hot pressing and fixing treatment is carried out according to the following procedure:

[0029]

[0030]

[0031] Among them, T1=80-95℃, T2=110-125℃.

[0032] The present invention provides a spliced bulletproof insert plate, which has the following advantages compared with the prior art:

[0033] The present invention glues and splices multiple ceramic blocks into a ceramic plate, and at the same time, the circumferential sides of the ceramic plate are wrapped with a long fiber layer to form a circumferential constraint, which can effectively increase the constraint stiffness between the spliced ceramic blocks, thereby effectively preventing the ceramic near the impact point from shifting or separating from the adjacent layers, improving the bulletproof insert's resistance to multiple shots and side protection performance, and reducing deformation and depression at the moment of impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0035] Figure 1 This is a schematic structural diagram of the spliced bulletproof insert plate of the present invention;

[0036] Figure 2 Schematic diagram of the structure of the ceramic plate of the present invention.

[0037] In the figure:

[0038] 10-first aramid sheet layer, 20-ceramic plate layer, 21-ceramic plate, 22-long fiber layer, 23-ceramic, 30-second aramid sheet layer, 40-polyethylene plate layer. DETAILED DESCRIPTION

[0039] The present invention will be described below by specific embodiment, and it will be appreciated by those skilled in the art that the specific embodiment below is only for illustrative purposes, and does not limit the scope of the present invention in any way. In addition, in the following examples, unless otherwise stated, the reagent and equipment used are all commercially available. If in the following examples, concrete treatment conditions and treatment process are not clearly described, then conditions and methods well known in the art can be adopted to process.

[0040] In one aspect of the present invention, the present invention provides a spliced bulletproof plate. In the direction from the bullet-facing surface to the back bullet surface, the spliced bulletproof plate comprises a first aramid sheet layer 10, a ceramic plate layer 20, a second aramid sheet layer 30, and a polyethylene plate layer 40 arranged in sequence; the ceramic plate layer 20 comprises a ceramic plate 21 and a long fiber layer 22 circumferentially wrapped around the side surface of the ceramic plate 21, and the ceramic plate 21 is formed by bonding and splicing a plurality of ceramics 23.

[0041] In the present invention, the first aramid sheet layer 10, the ceramic plate layer 20, the second aramid sheet layer 30, and the polyethylene plate layer 40 have the same shape and size. In the present invention, a plurality of ceramics 23 are bonded and spliced into the ceramic plate 21, and at the same time, the circumferential side of the ceramic plate 21 is wrapped with the long fiber layer 22 to form circumferential restraint, which can effectively improve the restraint stiffness between the spliced ceramic blocks, and further effectively prevent the ceramics near the bullet impact point from shifting or detaching from the adjacent layer, improve the anti-multiple-shot performance and side protection performance of the bulletproof plate, and reduce the deformation and depression at the moment of bullet impact.

[0042] In some embodiments of the present invention, the thicknesses of the first aramid sheet layer 10 and the second aramid sheet layer 30 are each independently ≥ 0.5 mm. Among them, the thickness of the first aramid sheet layer 10 is preferably 0.5 - 1 mm, specifically it can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm; the thickness of the second aramid sheet layer 30 is preferably 0.5 - 2 mm, specifically it can be 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, etc. The densities of the first aramid sheet layer and the second aramid sheet layer are each independently 1.35 - 1.50 g / cm 3 and specifically it can be 1.35 g / cm 3 、1.40 g / cm 3 、1.50 g / cm 3 etc. The first aramid sheet layer 10 and the second aramid sheet layer 30 serve as longitudinal restraint layers of the ceramic plate layer 20, which can limit the longitudinal spatter of ceramics from the bullet hole after being impacted by a bullet. In addition, by defining the thicknesses of the first aramid sheet layer 10 and the second aramid sheet layer 30, the longitudinal impact of broken ceramics and bullet heads can be better restrained.

[0043] In some embodiments of the present invention, the aramid sheets in the first aramid sheet layer 10 and the second aramid sheet layer 30 are each independently selected from epoxy resin aramid sheets or polycarbonate resin aramid sheets. Through experimental research, it is found that compared with traditional aramid woven fabrics, the epoxy resin aramid sheets or polycarbonate resin aramid sheets adopted in the present invention have better support and can effectively improve the stiffness of the bulletproof plate.

[0044] In some embodiments of the present invention, the thickness of the ceramic plate layer 20 is ≥ 9.5 mm, preferably 9.5 - 12 mm, and specifically can be 9.5 mm, 10 mm, 10.5 mm, 11 mm, 12 mm, etc. The ceramic 23 in the ceramic plate layer 20 is boron carbide ceramic and / or silicon carbide ceramic. The hardness of the boron carbide ceramic is ≥ 23 GPa, and the density is ≥ 2.52 g / cm 3 ; the hardness of the silicon carbide ceramic is ≥ 23 GPa, and the density is ≥ 3.13 g / cm 3 .

[0045] In some embodiments of the present invention, the polyethylene plate layer 40 is a fiber-reinforced polyethylene plate, which is made by pressing the polyethylene fibers into a non-woven fabric (UD fabric) with 15 - 20% glue and then pressing it into a plate shape. The strength of a single polyethylene fiber is ≥ 38 cN / dtex. The areal density of the polyethylene plate layer 40 is ≥ 10.5 kg / m 2 , preferably 10.5 - 12 kg / m 2 , and specifically can be 10.5 kg / m 2 , 10.8 kg / m 2 , 11 kg / m 2 , 12 kg / m 2 , etc., and the thickness is ≥ 10.8 mm, preferably 10.8 - 12 mm, and specifically can be 10.8 mm, 11 mm, 11.5 mm, 12 mm, etc.

[0046] In some embodiments of the present invention, the long fiber layer 22 is formed by winding at least one layer of long fibers circumferentially around the side of the ceramic plate 21. The long fibers include one or more of aramid fibers, polyimide fibers, and liquid crystal polymer fibers. The strength of a single long fiber is ≥ 24 cN / dtex; the thickness of the long fiber layer 22 is 0.2 - 0.4 mm, and specifically can be 0.2 mm, 0.3 mm, 0.4 mm, etc.

[0047] In some embodiments of the present invention, multiple pieces of the ceramic 23 are bonded to form the ceramic plate 21 through a resin adhesive. The viscosity of the resin adhesive is ≤ 1 Pa·s, preferably 0.6 - 1 Pa·s, and specifically can be 0.6 Pa·s, 0.7 Pa·s, 0.8 Pa·s, 1 Pa·s, etc. The curing temperature of the resin adhesive is ≥ 80 °C, preferably 80 - 95 °C, and specifically can be 80 °C, 85 °C, 90 °C, 95 °C, etc. The resin adhesive can specifically be an epoxy resin adhesive that meets the viscosity and curing temperature conditions. If the viscosity of the resin adhesive is too large, it will lead to poor infiltration effect, and then reduce the constraint stiffness between the spliced ceramic blocks, affecting the protection performance of the final bulletproof insert plate.

[0048] In some embodiments of the present invention, the first aramid sheet layer 10, the ceramic plate layer 20, the second aramid sheet layer 30, and the polyethylene plate layer 40 are all fixed by an adhesive film. The adhesive film includes one or more of a polyolefin adhesive film and a thermoplastic polyurethane adhesive film, and the areal density of the adhesive film ≥ 100 g / m 2 , and the thickness ≥ 0.15 mm. The present invention selects a solid adhesive film to bond each layer, with a more uniform thickness and a firmer bond.

[0049] In some embodiments of the present invention, a protective layer is provided on the outer periphery of the spliced bulletproof insert. Specifically, the protective layer can be a polyurea layer, that is, polyurea is coated on the outer periphery of the bulletproof insert (including the upper and lower surfaces and the four side surfaces of the bulletproof insert) to achieve full-area protection, and it can also play a role in waterproofing, preventing drop impact, and isolating ultraviolet rays.

[0050] On the other hand, the present invention also provides a method for preparing a spliced bulletproof insert, including the following steps:

[0051] (1) Splice and fix multiple ceramics on a substrate according to a preset shape to obtain a ceramic plate precursor;

[0052] (2) Wind long fibers circumferentially around the side of the ceramic plate precursor, then impregnate the adhesive into the splicing seams of the ceramic plate precursor, and after curing, separate the substrate to obtain a ceramic plate;

[0053] (3) Stack the first aramid sheet, the ceramic plate, the second aramid sheet, and the polyethylene plate in sequence and set an adhesive film between each layer, and then perform a hot pressing and fixing treatment to obtain a bulletproof insert.

[0054] In the present invention, first, multiple ceramics are spliced and fixed on a substrate according to a preset shape to obtain a ceramic plate precursor.

[0055] In some embodiments of the present invention, to ensure that multiple ceramics can be completely fixed on the substrate, the surface area of the side of the substrate in contact with the ceramics is larger than the area of the preset shape. Among them, the preset shape is determined according to the shape of the bulletproof insert. The shape of a single ceramic can be, for example, a quadrilateral, a hexagon, an octagon, etc. The present invention does not specifically limit the preset shape and the shape of a single ceramic.

[0056] In some embodiments of the present invention, the substrate mainly plays a role in fixing and positioning the ceramics. However, at the same time, to ensure that the subsequent ceramic plate can be smoothly separated from the substrate, the substrate is preferably a polytetrafluoroethylene plate.

[0057] In the present invention, after obtaining the ceramic plate precursor, wind long fibers circumferentially around the side of the ceramic plate precursor, then impregnate the adhesive into the splicing seams of the ceramic plate precursor, and after curing, separate the substrate to obtain a ceramic plate.

[0058] In some embodiments of the present invention, long fibers are wound circumferentially around the side of the ceramic plate precursor for at least 5 layers, and the long fibers are closely arranged in each layer. After winding, the thickness of the long fiber layer on the side of the ceramic plate precursor is 0.2 - 0.4 mm, specifically, it can be 0.2 mm, 0.3 mm, 0.4 mm, etc.

[0059] In some embodiments of the present invention, the ceramic plate precursor wound with long fibers is placed in a vacuum bag and evacuated, then an adhesive is injected into the vacuum bag and infiltrated into the splicing seams of the ceramic plate precursor. After the adhesive is cured, it is taken out and the substrate is separated to obtain a ceramic plate.

[0060] In some embodiments of the present invention, the evacuation is to make the pressure in the vacuum bag be -0.3 to -0.5 MPa, specifically, it can be -0.3 MPa, -0.4 MPa, -0.5 MPa, etc.; the curing temperature is ≥80 °C, specifically, it can be 80 °C, 85 °C, 90 °C, etc., to ensure that the adhesive can be completely cured, improve the connection rigidity between adjacent ceramics, and further improve the binding force between adjacent ceramics.

[0061] In the present invention, after obtaining the ceramic plate, the first aramid sheet, the ceramic plate, the second aramid sheet, and the polyethylene plate are stacked in sequence, and a film adhesive is provided between each layer, and then hot pressing and fixing treatment is carried out to obtain a bulletproof insert plate.

[0062] In some embodiments of the present invention, after the layers of the bulletproof insert plate and the film adhesive are stacked neatly, they are placed in a vacuum bag and evacuated, and then hot pressing and fixing treatment is carried out. The hot pressing and fixing treatment can be carried out in a hot press can. Through the hot pressing and fixing treatment, the first aramid sheet, the ceramic plate, the second aramid sheet, and the polyethylene plate can be compounded and bonded into one body.

[0063] In some embodiments of the present invention, the hot pressing and fixing treatment is carried out according to the procedure shown in Table 1:

[0064] Table 1

[0065] Program step Temperature Pressure / MPa Vacuum value / MPa Time / min 1 <![CDATA[The room temperature rises to T1]]> 0.1-0.5 -0.1～-1 20-40 2 <![CDATA[T1 rises to T2]]> 1-2.5 -0.1～-1 30-60 3 <![CDATA[T2]]> 1-2.5 -0.1～-1 60-90 4 <![CDATA[T2 drops to room temperature]]> 1-2.5 -0.1～-1 /

[0066] Among them, T1 = 80 - 95 °C, T2 = 110 - 125 °C.

[0067] It should be noted that in process step 1 of the program: under the conditions of a pressure of 0.1 - 0.5 MPa and a vacuum value of -0.1 to -1 MPa, the temperature is raised from room temperature to T1 and then kept at a constant temperature for 20 - 40 min; in process step 2 of the program: under the conditions of a pressure of 1 - 2.5 MPa and a vacuum value of -0.1 to -1 MPa, the temperature is raised from T1 to T2 and then kept at a constant temperature for 30 - 60 min; in process step 3 of the program: under the conditions of a pressure of 1 - 2.5 MPa and a vacuum value of -0.1 to -1 MPa, it is kept at a constant temperature for 60 - 90 min at temperature T2; in process step 4 of the program: under the conditions of a pressure of 1 - 2.5 MPa and a vacuum value of -0.1 to -1 MPa, it is naturally cooled from T2 to room temperature.

[0068] In the above table, T1 = 80 - 95 °C, T2 = 110 - 125 °C. T1 can be, for example, 80 °C, 85 °C, 90 °C, 95 °C, etc., and T2 can be, for example, 110 °C, 115 °C, 120 °C, 125 °C, etc.; the pressure of process step 1 of the program can be, for example, 0.1 MPa, 0.3 MPa, 0.5 MPa, etc., the vacuum value can be, for example, -0.1 MPa, -0.5 MPa, -1 MPa, etc., and the constant temperature holding time can be, for example, 20 min, 25 min, 30 min, 40 min, etc.; the pressure of process steps 2 to 4 of the program can be, for example, 1 MPa, 1.5 MPa, 2 MPa, 2.5 MPa, etc., the vacuum value can be, for example, -0.1 MPa, -0.5 MPa, -1 MPa, etc., the time of process step 2 can be, for example, 30 min, 40 min, 50 min, 60 min, etc., and the time of process step 3 can be, for example, 60 min, 70 min, 80 min, 90 min, etc.

[0069] In some embodiments of the present invention, the following steps are further included: spraying polyurea on the surface of the bulletproof plate. The thickness of the spraying is 0.3 - 0.5 mm, and can specifically be 0.3 mm, 0.4 mm, 0.5 mm, etc.

[0070] Hereinafter, the technical solutions in the present invention will be clearly and completely described in conjunction with specific embodiments. The embodiments of this application are only for illustration. All other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention.

[0071] Example 1

[0072] This embodiment provides a spliced bulletproof plate, which is sequentially provided with a first aramid sheet layer 10, a ceramic plate layer 20, a second aramid sheet layer 30, and a polyethylene plate layer 40 from the bullet-facing surface to the back bullet surface. Each layer is fixed by an adhesive film; the ceramic plate layer 20 includes a long fiber layer 22 and multiple ceramics. Multiple ceramics 23 are adhesively spliced to form a ceramic plate 21, and the long fiber layer 22 is circumferentially wrapped around the side of the ceramic plate 21. The outer periphery of the bulletproof plate is coated with 0.3 mm of polyurea.

[0073] Among them, the first aramid sheet layer 10 uses an epoxy resin aramid sheet with a thickness of 0.5 mm, and the second aramid sheet layer 30 uses an epoxy resin aramid sheet with a thickness of 0.5 mm; the thickness of the ceramic plate layer 20 is 9.5 mm, and it is spliced by silicon carbide ceramics with a hardness of 25 GPa and a density of 3.14 g / cm 3 ; the areal density of the polyethylene plate layer 40 is 11 kg / m 2 , the thickness is 11.34 mm, and the strength of a single polyethylene fiber is 38 cN / dtex; the long fiber is an aramid fiber with a strength of 24 cN / dtex, and the adhesive film is a polyolefin adhesive film with an areal density of 110 g / m 2 and a thickness of 0.2 mm.

[0074] The preparation method of the spliced bulletproof plate is as follows:

[0075] (1) Splice and fix multiple regular hexagonal ceramics on a polytetrafluoroethylene plate to obtain a ceramic plate precursor;

[0076] (2) Circumferentially wind 5 layers of long fibers around the side of the ceramic plate precursor to form a long fiber layer with a thickness of 0.2 mm. Put the ceramic plate precursor wound with long fibers into a vacuum bag and evacuate to -0.5 MPa, then inject an epoxy resin adhesive with a viscosity of 1 Pa·s into the vacuum bag and infiltrate it into the splicing seams of the ceramic plate precursor, and cure it at 85°C. After the epoxy resin adhesive is cured, take it out and separate the substrate to obtain a ceramic plate;

[0077] (3) Stack the first aramid sheet, adhesive film, ceramic plate, adhesive film, second aramid sheet, adhesive film, and polyethylene plate in order and put them into a vacuum bag, evacuate to -0.1 MPa, then perform hot pressing and fixing treatment in a hot press according to the procedure in Table 2. After taking it out and letting it cool to room temperature, spray polyurea to obtain a bulletproof plate.

[0078] Table 2

[0079]

[0080]

[0081] Example 2

[0082] This embodiment provides a spliced bulletproof insert plate. From the bullet-facing surface to the back bullet-facing surface, a first aramid sheet layer 10, a ceramic plate layer 20, a second aramid sheet layer 30, and a polyethylene plate layer 40 are sequentially arranged, and each layer is fixed by an adhesive film; the ceramic plate layer 20 includes a long fiber layer 22 and multiple ceramics 23. The multiple ceramics 23 are adhesively spliced to form a ceramic plate 21, and the long fiber layer 22 circumferentially wraps around the side of the ceramic plate 21. The outer periphery of the bulletproof insert plate is coated with 0.5 mm of polyurea.

[0083] Among them, the first aramid sheet layer 10 uses a polycarbonate resin aramid sheet with a thickness of 0.5 mm, and the second aramid sheet layer 30 uses a polycarbonate resin aramid sheet with a thickness of 1 mm; the thickness of the ceramic plate layer 20 is 9.8 mm and is spliced by boron carbide ceramics with a hardness of 25 GPa and a density of 2.52 g / cm 3 ; the areal density of the polyethylene plate layer 40 is 10.8 kg / m 2 , the thickness is 11.13 mm, and the strength of a single polyethylene fiber is 42 cN / dtex; the long fiber is an aramid fiber with a strength of 25 cN / dtex, and the adhesive film is a thermoplastic polyurethane adhesive film with an areal density of 110 g / m 2 and a thickness of 0.3 mm.

[0084] The preparation method of the spliced bulletproof insert plate is as follows:

[0085] (1) Splice and fix multiple regular hexagonal ceramics on a polytetrafluoroethylene plate to obtain a ceramic plate precursor;

[0086] (2) Circumferentially wind 6 layers of long fibers around the side of the ceramic plate precursor to form a long fiber layer with a thickness of 0.3 mm. Put the ceramic plate precursor wound with long fibers into a vacuum bag and evacuate to -0.3 MPa. Then inject an epoxy resin adhesive with a viscosity of 0.9 Pa·s into the vacuum bag and infiltrate it into the splicing seams of the ceramic plate precursor, and cure at 82 °C. After the epoxy resin adhesive cures, take it out and separate the substrate to obtain a ceramic plate;

[0087] (3) Stack the first aramid sheet, adhesive film, ceramic plate, adhesive film, second aramid sheet, adhesive film, and polyethylene plate in order and neatly, then put them into a vacuum bag, evacuate to -0.5 MPa, and then perform hot pressing and fixing treatment in a hot press according to the program in Table 3. Take it out and let it cool to room temperature, and then spray polyurea to obtain a bulletproof insert plate.

[0088] Table 3

[0089] Program step Temperature Pressure / MPa Vacuum value / MPa Time / min 1 Room temperature rises to 95 °C 0.2 -0.5 40 2 95 °C rises to 125 °C 1.5 -0.5 60 3 125℃ 1.5 -0.5 90 4 125 °C drops to room temperature 1.5 -0.5 /

[0090] Example 3

[0091] This embodiment provides a spliced bulletproof insert plate. From the bullet-facing surface to the back bullet surface, a first aramid sheet layer 10, a ceramic plate layer 20, a second aramid sheet layer 30, and a polyethylene plate layer 40 are sequentially arranged, and each layer is fixed by an adhesive film; the ceramic plate layer 20 includes a long fiber layer 22 and multiple ceramics 23, and the multiple ceramics 23 are adhesively spliced to form a ceramic plate 21, and the long fiber layer 22 circumferentially wraps around the side of the ceramic plate 21. The outer periphery of the bulletproof insert plate is coated with 0.3 mm of polyurea.

[0092] Among them, the first aramid sheet layer 10 uses an epoxy resin aramid sheet with a thickness of 0.6 mm, and the second aramid sheet layer 30 uses an epoxy resin aramid sheet with a thickness of 0.6 mm; the thickness of the ceramic plate layer 20 is 9.6 mm, and it is spliced by boron carbide ceramics with a hardness of 27 GPa and a density of 2.82 g / cm 3 ; the areal density of the polyethylene plate layer 40 is 10.5 kg / m 2 , the thickness is 10.8 mm, and the strength of a single polyethylene fiber is 40.5 cN / dtex; the long fiber is an aramid fiber with a strength of 24 cN / dtex, and the adhesive film is a polyolefin adhesive film with an areal density of 120 g / m 2 and a thickness of 0.25 mm.

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

[0094] (1) Splice and fix multiple regular hexagonal ceramics on a polytetrafluoroethylene plate according to a preset shape to obtain a ceramic plate precursor;

[0095] (2) Circumferentially wind 6 layers of long fibers around the side of the ceramic plate precursor to form a long fiber layer with a thickness of 0.25 mm, put the ceramic plate precursor wound with long fibers into a vacuum bag and evacuate to -0.4 MPa, then inject an epoxy resin adhesive with a viscosity of 0.9 Pa·s into the vacuum bag and infiltrate it into the splicing seams of the ceramic plate precursor, cure at 80 °C, and after the epoxy resin adhesive cures, take it out and separate the substrate to obtain a ceramic plate;

[0096] (3) Stack the first aramid sheet, adhesive film, ceramic plate, adhesive film, second aramid sheet, adhesive film, and polyethylene plate in order and put them into a vacuum bag, evacuate to -1 MPa, then perform hot pressing and fixing treatment in a autoclave according to the procedure in Table 4, take it out and let it cool to room temperature, and then spray polyurea to obtain a bulletproof insert plate.

[0097] Table 4

[0098]

[0099] Comparative Example 1

[0100] This embodiment provides a spliced bulletproof insert plate, which is sequentially provided with an aramid cloth layer, a ceramic plate layer, an aramid cloth layer, and a polyethylene plate layer from the bullet-facing surface to the back bullet surface, and each layer is bonded and fixed by a polyurethane binder.

[0101] Among them, the aramid cloth layer is an aramid woven fabric with a thickness of 0.5 mm; the thickness of the ceramic layer is 9.5 mm, and it is spliced by silicon carbide ceramics with a hardness of 25 GPa and a density of 3.14 g / cm 3 The areal density of the polyethylene plate layer is 11 kg / m 2 and the thickness is 11.34 mm, where the strength of a single polyethylene fiber is 38 cN / dtex.

[0102] The preparation method of this spliced bulletproof insert plate is as follows:

[0103] (1) Coat and splice multiple regular hexagonal ceramics with a polyurethane binder according to a preset shape and fix them on a polytetrafluoroethylene plate to obtain a ceramic plate;

[0104] (2) Stack the aramid woven fabric, the ceramic plate, the aramid woven fabric, and the polyethylene plate in sequence, fill the space between each layer with a polyurethane binder, stack them neatly, put them into a vacuum bag, evacuate to -0.1 MPa, cure at room temperature for 10 h, take them out, and spray polyurea after cooling to room temperature to obtain a bulletproof insert plate.

[0105] Comparative Example 2

[0106] This comparative example is basically the same as Example 2, and the only difference is that long fibers are not wound around the circumference of the side of the ceramic plate precursor.

[0107] Comparative Example 3

[0108] This comparative example is basically the same as Example 3, and the only difference is that the adhesive film is replaced with a polyurethane binder, and 0.4 mm of polyurea is coated on the outer periphery of the bulletproof insert plate.

[0109] The bulletproof insert plates prepared in Examples 1-3 and Comparative Examples 1-3 were tested for weight, areal density, anti-multiple-shot performance, and bulletproof performance 20 mm away from the side edge. The results are shown in Table 5. Among them, the anti-multiple-shot performance test refers to the NIJ0101.06 standard, at a distance of 15 m, and the bullet type is 7.62×54 mm armor-piercing incendiary bullet.

[0110] Table 5

[0111]

[0112] As can be seen from Table 5, the spliced bulletproof panel of the present invention has the characteristics of large self-constraint stiffness of ceramics, high longitudinal and circumferential constraint strengths, and high bonding strength between layers of materials. It can withstand multiple bullet strikes, with small overall deformation and stable bulletproof performance on the side 20 mm. This improves the reliability of the bulletproof performance of the spliced bulletproof panel. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A spliced bulletproof insert panel, characterized in that, In the direction from the bullet-facing surface to the back bullet surface, the spliced bulletproof plate comprises a first aramid sheet layer, a ceramic plate layer, a second aramid sheet layer and a polyethylene plate layer arranged in sequence; The ceramic plate layer comprises a ceramic plate and a long fiber layer circumferentially wrapping the side surface of the ceramic plate, and the ceramic plate is formed by bonding and splicing multiple pieces of ceramics.

2. The spliced bulletproof insert plate according to claim 1, characterized in that The thicknesses of the first aramid sheet layer and the second aramid sheet layer are each independently ≥0.5 mm; The density of the first aramid sheet layer and the second aramid sheet layer are each independently 1.35 - 1.50 g / cm 3 ; The aramid sheets in the first aramid sheet layer and the second aramid sheet layer are each independently selected from epoxy resin aramid sheets or polycarbonate resin aramid sheets.

3. The spliced bulletproof insert plate according to claim 1, characterized in that, The thickness of the ceramic plate layer is ≥9.5 mm; The ceramic in the ceramic plate layer is boron carbide ceramic and / or silicon carbide ceramic, and the hardness of the ceramic is ≥23 GPa; The density of the boron carbide ceramic is ≥ 2.52 g / cm 3 , and the density of the silicon carbide ceramic is ≥ 3.13 g / cm 3 .

4. The spliced bulletproof insert plate according to claim 1, wherein The surface density of the polyethylene sheet layer ≥ 10.5 kg / m 2 , and the thickness ≥ 10.8 mm.

5. The spliced bulletproof insert plate according to claim 1, characterized in that The long fiber layer is formed by circumferentially winding at least one layer of long fiber around the side of the ceramic plate, and the thickness of the long fiber layer is 0.2 - 0.4 mm; The long fiber comprises one or more of aramid fiber, polyimide fiber, and liquid crystal polymer fiber.

6. The spliced bulletproof insert plate according to claim 1, characterized in that, Multiple pieces of the ceramics are bonded by a resin adhesive to form a ceramic plate; The viscosity of the resin adhesive is ≤1 Pa·s, and the curing temperature is ≥80 °C.

7. The spliced bulletproof insert plate according to claim 1, characterized in that, The first aramid sheet layer, the ceramic plate layer, the second aramid sheet layer and the polyethylene plate layer are all fixed by a film; The film comprises one or more of a polyolefin film and a thermoplastic polyurethane film; The areal density of the adhesive film ≥ 100 g / m 2 , and the thickness ≥ 0.15 mm.

8. The spliced bulletproof insert plate according to any one of claims 1-7, characterized in that, A protective layer is provided on the outer periphery of the spliced bulletproof plate.

9. A method for preparing the spliced bulletproof panel according to any one of claims 1-8, characterized in that, Comprising the following steps: (1) Splicing and fixing multiple pieces of ceramics on a substrate according to a preset shape to obtain a ceramic plate precursor; (2) Circumferentially winding long fibers around the side of the ceramic plate precursor, then infiltrating an adhesive into the splicing seams of the ceramic plate precursor, and separating the substrate after curing to obtain a ceramic plate; (3) Stacking the first aramid sheet, the ceramic plate, the second aramid sheet and the polyethylene plate in sequence and arranging a film between each layer, and then performing a hot pressing and fixing treatment to obtain a bulletproof plate.

10. The preparation method of the spliced bulletproof insert plate according to claim 9, characterized in that, The hot pressing and fixing treatment is carried out according to the following procedure: Wherein, T1 = 80 - 95 °C, T2 = 110 - 125 °C.

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