Anti-falling curved surface spliced ceramic bulletproof plugboard and preparation method thereof

Abstract

The invention relates to the field of ceramic bulletproof plugboards, in particular to an anti-falling curved surface spliced ceramic bulletproof plugboard and a preparation method thereof. The anti-falling curved surface spliced ceramic bulletproof plugboard comprises a laminated structure and a polyurea layer coating the periphery of the laminated structure, the laminated structure comprises an anti-falling layer, a crack arrest layer, a ceramic layer, a polyethylene layer and a concave reduction foam layer which are sequentially laminated in the direction from the bullet facing surface to the bullet backing surface; the anti-falling layer comprises aramid fiber honeycombs, and hole grids of the aramid fiber honeycombs are filled with a mixture of hollow glass microspheres and silica gel; and the crack arrest layer comprises aramid fiber woven cloth. The anti-falling layer provided by the invention is composed of the aramid fiber honeycomb, the hollow glass microspheres and the silica gel, the structure simulates a human bone tissue structure, the aramid fiber honeycomb provides a structural framework and supports the falling layer not to deform, and the hollow glass microspheres have high compression strength, can resist impact and absorb impact energy through microsphere damage; the silica gel not only can be used for bonding the aramid honeycomb and the microspheres, but also can be used for providing elasticity and restoring the deformation after impact.

Description

Technical Field

[0001] This invention relates to the field of ceramic bulletproof inserts, and more particularly to a drop-resistant curved surface spliced ​​ceramic bulletproof insert and its preparation method. Background Technology

[0002] Ceramic bulletproof inserts are the core product for achieving high-level protection in bulletproof vests. They primarily consist of high-hardness ceramic on the impact surface to break, abrade, and blunt the projectile, while the remaining kinetic energy is absorbed by a backplate made of aramid fiber or ultra-high molecular weight polyethylene fiber. Due to the brittle nature of ceramics, bulletproof inserts often suffer from insufficient drop resistance in practical applications, especially curved inserts with convex surfaces, which are more prone to drop cracks, significantly weakening their ballistic performance. To simulate drop conditions encountered in daily use, the U.S. Department of Justice standard NIJ0101.07 requires bulletproof inserts to undergo two drop tests before ballistic testing. Therefore, a drop-resistant layer must be added to the bulletproof insert to meet the testing requirements. Existing drop-resistant layers are mainly made of foamed materials such as foamed EVA, foamed PP, and polyurethane foam, which have low impact compressive strength and require a thickness of at least 4mm to meet drop resistance requirements. This results in excessively thick and heavy bulletproof inserts, necessitating a lightweight drop-resistant layer design with low thickness. Summary of the Invention

[0003] This invention provides a drop-resistant curved spliced ​​ceramic bulletproof insert and its preparation method. The drop-resistant curved spliced ​​ceramic bulletproof insert has the characteristics of strong pressure resistance of the drop-resistant layer, lightweight and thinness, and can protect ceramics from cracking due to drops.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: The present invention provides a drop-resistant curved spliced ​​ceramic bulletproof insert, comprising a laminated structure and a polyurea layer covering the outer periphery of the laminated structure; The laminated structure, from the impact-facing surface to the impact-reducing surface, includes a drop-resistant layer, a crack-resistant layer, a ceramic layer, a polyethylene layer, and a dent-reducing foam layer stacked sequentially. The anti-drop curved spliced ​​ceramic bulletproof insert plate has an arc-shaped structure; in the arc-shaped structure, the convex surface is the anti-ballistic surface and the concave surface is the anti-ballistic surface. The drop-resistant layer includes aramid honeycomb, and the pores of the aramid honeycomb are filled with a mixture of hollow glass microspheres and silicone. The crack-resistant layer comprises aramid woven fabric.

[0005] In some specific embodiments, the ceramic layer comprises silicon carbide, boron carbide, or aluminum oxide.

[0006] In some specific embodiments, the ceramic layer is formed by bonding and splicing multiple hexagonal ceramic pieces; the length of opposite sides of the hexagons in the ceramic layer is 20~30mm.

[0007] In some specific embodiments, the thickness of the ceramic layer is ≥3mm.

[0008] In some specific embodiments, the thickness of the crack arresting layer is ≥0.5mm.

[0009] In some specific embodiments, the thickness of the polyethylene layer is ≥7mm, and the strength of the polyethylene fibers in the polyethylene layer is greater than 36cN / dtex.

[0010] In some specific embodiments, the thickness of the drop-resistant layer is 1~2mm.

[0011] In some specific embodiments, the pore size of the aramid honeycomb is 1.83~4.8mm.

[0012] In some specific embodiments, the hollow glass microspheres have a D50 of 20-100 micrometers and a density of 0.2-0.5 g / cm³. 3 The hollow glass microspheres have an isostatic compressive strength ≥5MPa.

[0013] In some specific embodiments, the mass content of the hollow glass microspheres is 30% to 70%, based on the total mass of the hollow glass microspheres and the silica gel.

[0014] In some specific embodiments, the thickness of the polyurea layer is 0.2~0.8 mm.

[0015] In some specific embodiments, the thickness of the anti-dent foam layer is 3~5mm.

[0016] In some specific embodiments, the anti-deformation foam layer includes ethylene-vinyl acetate copolymer (EVA) foam, foamed polypropylene (PP) or foamed polyurethane.

[0017] A second aspect of the present invention also provides a method for preparing a drop-resistant curved spliced ​​ceramic bulletproof insert, comprising the following steps: One side of the ceramic layer is bonded to the polyethylene layer, and the crack-resistant layer is bonded to the other side of the ceramic layer. Then, the drop-resistant layer is bonded to the other side of the crack-resistant layer, and the anti-dent foam layer is bonded to the other side of the polyethylene layer. The sample is then placed on a curved tooling for shaping. After the shaping is completed, polyurea is sprayed onto the outer periphery of the sample.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention relates to a drop-resistant curved surface spliced ​​ceramic bulletproof insert, comprising a laminated structure and a polyurea layer covering the outer periphery of the laminated structure; the laminated structure, from the impact-facing surface to the back impact-facing surface, comprises a drop-resistant layer, a crack-resistant layer, a ceramic layer, a polyethylene layer, and a concave foam layer stacked sequentially; the drop-resistant curved surface spliced ​​ceramic bulletproof insert has an arc-shaped structure; wherein, in the arc-shaped structure, the convex surface is the impact-facing surface, and the concave surface is the back impact-facing surface. The drop-resistant layer comprises an aramid honeycomb filled with hollow glass microspheres and silicone, and the crack-resistant layer comprises aramid woven fabric. The drop-resistant layer is composed of aramid honeycomb, hollow glass microspheres, and silicone. This structure mimics the structure of human bone tissue; the aramid honeycomb provides the structural framework, supporting the drop layer without deformation; the hollow glass microspheres have high compressive strength, resisting impact and absorbing impact energy through microsphere destruction; and the silicone, in addition to providing adhesion between the aramid honeycomb and microspheres, also provides elasticity, restoring deformation after impact. The ceramic fragmentation warhead absorbs energy, the polyethylene layer absorbs the kinetic energy of the warhead and the fragmented ceramic, and the anti-dent foam layer provides compression space to reduce the dent of the insert plate. Attached Figure Description

[0019] The above and other objects, features, and advantages of the invention will be apparent from the following description of preferred embodiments illustrating the gist of the invention and its use, and the accompanying drawings, in which: Figure 1 The diagram shown is a structural schematic of the anti-drop curved spliced ​​ceramic bulletproof insert plate of the present invention. Detailed Implementation

[0020] The present invention will be described below through specific embodiments. Those skilled in the art will understand that the specific embodiments described below are for illustrative purposes only and do not limit the scope of the invention in any way. Furthermore, in the following embodiments, unless otherwise specified, the reagents and equipment used are commercially available. If specific processing conditions and methods are not explicitly described in the following embodiments, conditions and methods known in the art can be used for processing.

[0021] The present invention provides a drop-resistant curved spliced ​​ceramic bulletproof insert, comprising a laminated structure and a polyurea layer covering the outer periphery of the laminated structure; The laminated structure, from the impact-facing surface to the impact-reducing surface, includes a drop-resistant layer, a crack-resistant layer, a ceramic layer, a polyethylene layer, and a dent-reducing foam layer stacked sequentially. The anti-drop curved spliced ​​ceramic bulletproof insert plate has an arc-shaped structure; in the arc-shaped structure, the convex surface is the anti-ballistic surface and the concave surface is the anti-ballistic surface. The drop-resistant layer includes aramid honeycomb, and the pores of the aramid honeycomb are filled with a mixture of hollow glass microspheres and silicone. The crack-resistant layer comprises aramid woven fabric.

[0022] The anti-drop curved spliced ​​ceramic bulletproof insert of the present invention includes a laminated structure and a polyurea layer covering the outer periphery of the laminated structure; the laminated structure includes an anti-drop layer, a crack-resistant layer, a ceramic layer, a polyethylene layer and a deflection-reducing foam layer stacked sequentially from the anti-ballistic surface to the back ballistic surface; wherein the anti-drop layer, crack-resistant layer, ceramic layer, polyethylene layer and deflection-reducing foam layer are bonded and fixed to form an integral laminated structure; the anti-drop curved spliced ​​ceramic bulletproof insert is an arc-shaped structure; wherein in the arc-shaped structure, the convex surface is the anti-ballistic surface and the concave surface is the back ballistic surface; wherein the anti-drop layer includes aramid honeycomb filled with hollow glass microspheres and silicone, and the crack-resistant layer includes aramid woven fabric. The drop-resistant layer is composed of aramid honeycomb, hollow glass microspheres, and silicone. This structure mimics the structure of human bone tissue. The aramid honeycomb provides the structural skeleton to support the drop layer without deformation. The hollow glass microspheres have high compressive strength, which can resist impact and absorb impact energy through microsphere destruction. In addition to providing adhesion between the aramid honeycomb and microspheres, the silicone also provides elasticity to recover from the deformation after impact.

[0023] In some embodiments, the ceramic layer includes, but is not limited to, silicon carbide, boron carbide, or aluminum oxide.

[0024] In some embodiments, the density of silicon carbide is ≥3.13 g / cm³. 3 .

[0025] In some embodiments, the density of boron carbide is >2.5 g / cm³. 3 .

[0026] In some embodiments, the density of alumina is ≥3.85 g / cm³. 3 .

[0027] In this invention, by adjusting the density of silicon carbide, boron carbide and aluminum oxide within the above range, a better bulletproof effect can be ensured. If the density is too low, the bulletproof performance will be insufficient.

[0028] In some embodiments, the ceramic layer is formed by bonding and splicing multiple hexagonal ceramic pieces; the length of opposite sides of the hexagons in the ceramic layer is 20-30mm. As an example, the length of opposite sides of the hexagons in the ceramic layer can be 20mm, 22mm, 24mm, 25mm, 26mm, 27mm, 29mm, and 30mm, etc.

[0029] In this invention, the ceramic layer is made of multiple hexagonal ceramic pieces bonded together, which helps to reduce the crack propagation path caused by drops and provides good resistance to multiple impacts.

[0030] In some embodiments, the thickness of the ceramic layer is ≥3 mm.

[0031] In some embodiments, the thickness of the crack-arresting layer is ≥0.5 mm.

[0032] In some embodiments, the thickness of the polyethylene layer is ≥7 mm, and the strength of the polyethylene fibers in the polyethylene layer is greater than 36 cN / dtex.

[0033] In some embodiments, the thickness of the drop-resistant layer is 1-2 mm.

[0034] In some embodiments, the pore size of the aramid honeycomb is 1.83~4.8mm.

[0035] In some embodiments, the hollow glass microspheres have a D50 of 20-100 micrometers and a density of 0.2-0.5 g / cm³. 3 The hollow glass microspheres have an isostatic compressive strength ≥ 5 MPa. As an example, the D50 of the hollow glass microspheres can be 20 μm, 30 μm, 50 μm, 60 μm, 80 μm, and 100 μm, and the density can be 0.2 g / cm³. 3 0.25g / cm 3 0.3g / cm 3 0.35g / cm 3 0.4g / cm 3 0.45g / cm 3 and 0.5g / cm 3 The isostatic compressive strength can be 5MPa, 6MPa, 7MPa, 8MPa, 9MPa and 10MPa, etc.

[0036] In some embodiments, the mass content of the hollow glass microspheres is 30% to 70% based on the total mass of the hollow glass microspheres and the silica gel. For example, the mass content of the hollow glass microspheres can be 30%, 40%, 50%, 60%, and 70%, etc.

[0037] In this invention, controlling the mass ratio of hollow glass microspheres to silica gel within the aforementioned range helps to achieve a good energy absorption effect. If the content of hollow glass microspheres is too high, it will lead to insufficient structural elasticity; if the content of hollow glass microspheres is too low, it will lead to a decrease in the structure's compressive strength.

[0038] In some embodiments, the thickness of the polyurea layer is 0.2~0.8 mm.

[0039] In some embodiments, the thickness of the anti-dent foam layer is 3-5 mm.

[0040] In some embodiments, the anti-deformation foam layer comprises ethylene-vinyl acetate copolymer (EVA) foam, expanded polypropylene (PP) foam, or expanded polyurethane foam.

[0041] A second aspect of the present invention also provides a method for preparing a drop-resistant curved spliced ​​ceramic bulletproof insert, comprising the following steps: One side of the ceramic layer is bonded to the polyethylene layer, and the crack-resistant layer is bonded to the other side of the ceramic layer. Then, the drop-resistant layer is bonded to the other side of the crack-resistant layer, and the anti-dent foam layer is bonded to the other side of the polyethylene layer. The sample is then placed on a curved tooling for shaping. After the shaping is completed, polyurea is sprayed onto the outer periphery of the sample.

[0042] In some embodiments, the adhesive may be polyurethane and / or epoxy resin, or pressure-sensitive adhesive or double-sided tape made of acrylic polymers or rubber polymers.

[0043] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. The embodiments of this application are only examples, and all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Example 1 The anti-drop curved spliced ​​ceramic bulletproof insert is composed of a laminated structure and a polyurea layer covering the outer periphery of the laminated structure; the laminated structure includes, in the direction from the impact surface to the back surface, an anti-drop layer, a crack-resistant layer, a ceramic layer, a polyethylene layer, and a dent-reducing foam layer stacked sequentially; the anti-drop curved spliced ​​ceramic bulletproof insert has an arc-shaped structure; wherein in the arc-shaped structure, the convex surface is the impact surface and the concave surface is the back surface; The ceramic layer is composed of materials with a density of 3.15 g / cm³. 3 It is made of multiple hexagonal ceramic silicon carbide pieces bonded together. The hexagonal ceramic pieces have opposite sides of 30mm and a thickness of 10mm. The crack-resistant layer is made of aramid woven fabric with a thickness of 0.5 mm; The polyethylene (PE) layer is 11 mm thick, and the polyethylene fiber strength is 36.5 cN / dtex. The drop-resistant layer uses 1mm thick aramid honeycomb with a pore size of 3.2mm. The honeycomb is filled with silicone-mixed hollow glass microspheres with a D50 size of 40 micrometers and a density of 0.2g / cm³. 3 The isostatic compressive strength is 9 MPa; based on the total mass of the hollow glass microspheres and the silica gel, the mass content of the hollow glass microspheres is 30%. The concave foam layer is made of EVA foam with a thickness of 5mm; The thickness of the polyurea layer is 0.3 mm; The fabrication process of this drop-resistant curved spliced ​​ceramic bulletproof insert includes the following steps: First, the ceramic layer is bonded to the convex backing of the curved PE using polyurethane resin. After the resin cures, polyurethane resin is evenly coated on the ceramic surface, and then aramid woven fabric is bonded to the ceramic layer. Hollow glass microspheres and silica gel are mixed evenly, then coated and filled into the hexagonal holes of aramid honeycomb. After curing at room temperature, they are then bonded to the crack-resistant aramid woven fabric with polyurethane resin.

[0045] After cleaning the above-mentioned structural surfaces, the concave surface of the PE is bonded with a de-denting foam layer using double-sided adhesive, and then placed on a curved surface fixture for shaping. The entire surface is then sprayed with polyurea and subjected to two drop tests according to NIJ0101.07 standard, followed by a target test. It can protect against six Type 53 7.62mm armor-piercing incendiary rounds, with the instantaneous dent deformation of the putty upon impact being less than 40mm.

[0046] Example 2 The anti-drop curved spliced ​​ceramic bulletproof insert is composed of a laminated structure and a polyurea layer covering the outer periphery of the laminated structure; the laminated structure includes, in the direction from the impact surface to the back surface, an anti-drop layer, a crack-resistant layer, a ceramic layer, a polyethylene layer, and a dent-reducing foam layer stacked sequentially; the anti-drop curved spliced ​​ceramic bulletproof insert has an arc-shaped structure; wherein in the arc-shaped structure, the convex surface is the impact surface and the concave surface is the back surface; The ceramic layer is composed of materials with a density of 2.85 g / cm³. 3 The hexagonal spliced ​​ceramic is composed of boron carbide, and the length of the opposite sides of the hexagon in the hexagonal spliced ​​ceramic is 29.4 mm, and the thickness is 4 mm. The crack-resistant layer is made of aramid woven fabric with a thickness of 0.7 mm; The thickness of the curved polyethylene (PE) layer is 10 mm, and the strength of the polyethylene fiber is 36.5 cN / dtex; The drop-resistant layer uses a 2mm thick aramid honeycomb structure with a 4.8mm pore size. The honeycomb is filled with silicone-mixed hollow glass microspheres. The hollow glass microspheres have a D50 size of 25 micrometers and a density of 0.5g / cm³. 3 The isostatic compressive strength is 9 MPa; based on the total mass of the hollow glass microspheres and the silica gel, the mass content of the hollow glass microspheres is 70%. The anti-deformation foam layer is made of foamed PP with a thickness of 5mm; The thickness of the polyurea layer is 0.5 mm; The fabrication process of this drop-resistant curved spliced ​​ceramic bulletproof insert includes the following steps: First, the ceramic layer is bonded to the convex backing of the curved PE using epoxy resin. After the resin cures, epoxy resin is evenly coated on the ceramic surface, and then aramid woven fabric is bonded to the ceramic layer. Hollow glass microspheres and silicone are mixed evenly, then coated and filled into the hexagonal holes of aramid honeycomb. After curing at room temperature, they are then bonded to the crack-resistant aramid woven fabric with epoxy resin.

[0047] After cleaning the above-mentioned structural surfaces, the concave surface of the PE is bonded with epoxy resin to the anti-dent foam layer, and then placed on a curved tooling for shaping. The entire surface is sprayed with polyurea, and subjected to two drop tests according to NIJ0101.07 standard, followed by target test. It can protect against 7.62×51mm M80 rounds, with the instantaneous dent deformation of the putty upon impact being less than 40mm.

[0048] Example 3 The anti-drop curved spliced ​​ceramic bulletproof insert is composed of a laminated structure and a polyurea layer covering the outer periphery of the laminated structure; the laminated structure includes, in the direction from the impact surface to the back surface, an anti-drop layer, a crack-resistant layer, a ceramic layer, a polyethylene layer, and a dent-reducing foam layer stacked sequentially; the anti-drop curved spliced ​​ceramic bulletproof insert has an arc-shaped structure; wherein in the arc-shaped structure, the convex surface is the impact surface and the concave surface is the back surface; The ceramic layer is composed of materials with a density of 3.85 g / cm³. 3 The hexagonal spliced ​​ceramic is composed of alumina, and the length of the opposite sides of the hexagons in the hexagonal spliced ​​ceramic is 25mm, and the thickness is 7mm; The crack-resistant layer is made of aramid woven fabric with a thickness of 0.7 mm; The thickness of the curved polyethylene (PE) layer is 10 mm, and the strength of the polyethylene fiber is 36.5 cN / dtex; The drop-resistant layer uses 1.5mm thick aramid honeycomb with a pore size of 1.83mm. The honeycomb is filled with silicone-mixed hollow glass microspheres with a D50 size of 100 micrometers and a density of 0.35g / cm³. 3 The isostatic compressive strength is 40 MPa; based on the total mass of the hollow glass microspheres and the silica gel, the mass content of the hollow glass microspheres is 55%. The anti-deformation foam layer is made of expanded polyurethane foam with a thickness of 4mm; The thickness of the polyurea layer is 0.5 mm; The fabrication process of this drop-resistant curved spliced ​​ceramic bulletproof insert includes the following steps: First, the ceramic layer is bonded to the convex backing of the curved PE using epoxy resin. After the resin cures, epoxy resin is evenly coated on the ceramic surface, and then aramid woven fabric is bonded to the ceramic layer. Hollow glass microspheres and silicone are mixed evenly, then coated and filled into the hexagonal holes of aramid honeycomb. After curing at room temperature, they are then bonded to the crack-resistant aramid woven fabric with epoxy resin.

[0049] After cleaning the above-mentioned structural surfaces, the concave surface of the PE is bonded with epoxy resin to form a de-denting foam layer, and then placed on a curved tooling for shaping. The entire surface is then sprayed with polyurea and subjected to two drop tests according to NIJ0101.07 standard, followed by a target test. It can protect against six 7.62×39mm armor-piercing incendiary rounds, with the instantaneous dent deformation of the putty upon impact being less than 44mm.

[0050] Comparative Example 1 Except for the use of 1mm EVA foam in the drop layer, the other steps were the same as in Example 1. Two drop tests were performed according to NIJ0101.07 standard, followed by a target firing test. After the drop tests, the ceramic showed crack damage, and 2 out of 6 targets were penetrated.

[0051] Comparative Example 2 Except for the use of 2mm foamed PP for the drop layer, the other steps were the same as in Example 2. Two drop tests were performed according to NIJ0101.07 standard, followed by a target firing test. After the drop tests, the ceramic showed crack damage, and one out of six targets fired penetrated the ceramic.

[0052] Comparative Example 3 Except for the use of 1.5mm expanded polyurethane foam for the drop layer, the other steps were the same as in Example 3. Two drop tests were performed according to NIJ0101.07 standard, followed by a target firing test. After the drop tests, the ceramic showed crack damage, and one out of six targets fired penetrated the ceramic.

[0053] Although preferred embodiments of the invention have been shown and described, it is conceivable that those skilled in the art can devise various modifications to the invention within the spirit and scope of the appended claims.

Claims

1. A drop-resistant curved spliced ​​ceramic bulletproof insert, characterized in that, It includes a laminated structure and a polyurea layer covering the periphery of the laminated structure; The laminated structure, from the impact-facing surface to the impact-reducing surface, includes a drop-resistant layer, a crack-resistant layer, a ceramic layer, a polyethylene layer, and a dent-reducing foam layer stacked sequentially. The anti-drop curved spliced ​​ceramic bulletproof insert plate has an arc-shaped structure; in the arc-shaped structure, the convex surface is the anti-ballistic surface and the concave surface is the anti-ballistic surface. The drop-resistant layer includes aramid honeycomb, and the pores of the aramid honeycomb are filled with a mixture of hollow glass microspheres and silicone. The crack-resistant layer comprises aramid woven fabric.

2. The anti-drop curved spliced ​​ceramic bulletproof insert plate according to claim 1, characterized in that, The ceramic layer comprises silicon carbide, boron carbide, or aluminum oxide; The ceramic layer is composed of multiple hexagonal ceramic pieces bonded together; the length of the opposite sides of the hexagonal ceramic pieces is 20~30mm.

3. The anti-drop curved spliced ​​ceramic bulletproof insert plate according to claim 1, characterized in that, The thickness of the ceramic layer is ≥3mm; The thickness of the crack arresting layer is ≥0.5mm.

4. The anti-drop curved spliced ​​ceramic bulletproof insert plate according to claim 1, characterized in that, The thickness of the polyethylene layer is ≥7mm, and the strength of the polyethylene fibers in the polyethylene layer is greater than 36cN / dtex.

5. The anti-drop curved spliced ​​ceramic bulletproof insert plate according to claim 1, characterized in that, The thickness of the drop-resistant layer is 1~2mm.

6. The anti-drop curved spliced ​​ceramic bulletproof insert plate according to claim 1, characterized in that, The pore size of the aramid honeycomb is 1.83~4.8mm; The hollow glass microspheres have a D50 of 20-100 micrometers and a density of 0.2-0.5 g / cm³. 3 The hollow glass microspheres have an isostatic compressive strength ≥5MPa.

7. The anti-drop curved spliced ​​ceramic bulletproof insert plate according to claim 1, characterized in that, Based on the total mass of the hollow glass microspheres and the silica gel, the mass content of the hollow glass microspheres is 30% to 70%.

8. The anti-drop curved spliced ​​ceramic bulletproof insert plate according to claim 1, characterized in that, The thickness of the polyurea layer is 0.2~0.8 mm; The thickness of the anti-depression foam layer is 3~5mm.

9. The anti-drop curved spliced ​​ceramic bulletproof insert plate according to claim 1, characterized in that, The anti-deformation foam layer includes ethylene-vinyl acetate copolymer foam, foamed polypropylene, or foamed polyurethane.

10. A method for preparing a drop-resistant curved surface spliced ​​ceramic bulletproof insert according to any one of claims 1 to 9, characterized in that, Includes the following steps: One side of the ceramic layer is bonded to the polyethylene layer, and the crack-resistant layer is bonded to the other side of the ceramic layer. Then, the drop-resistant layer is bonded to the other side of the crack-resistant layer, and the anti-dent foam layer is bonded to the other side of the polyethylene layer. The sample is then placed on a curved tooling for shaping. After the shaping is completed, polyurea is sprayed onto the outer periphery of the sample.

Images