Multi-layer composite structure bulletproof flashboard and preparation method thereof

Abstract

The invention discloses a multi-layer composite structure bulletproof flashboard and a preparation method thereof, and relates to the technical field of bulletproof materials. The bulletproof flashboard with the layer composite structure sequentially comprises an anti-impact layer, a sandwich structure layer and a bottom buffer layer, the anti-impact layer comprises a high-performance fiber woven cloth layer, a ceramic layer and a titanium alloy plate which are stacked in sequence; the sandwich structure layer comprises a composite hard board, a chopped fiber honeycomb layer and a high-performance fiber composite material board which are stacked in sequence; and the composite hard board is formed by laminating two layers of high-performance fiber composite material plates and a titanium alloy plate. The bulletproof flashboard with the layer composite structure adopts the special structural design of compounding multiple layers of materials, the bulletproof performance of the whole bulletproof flashboard can be improved, secondary damage to a wearer is reduced, compared with an existing bulletproof plate, the bulletproof flashboard is thinner and lighter, the manufacturing cost can be reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bulletproof materials, and in particular to a bulletproof insert plate with a multi-layer composite structure and a preparation method thereof. Background Art

[0002] As the second generation of bulletproof materials, ceramics are the beginning of the transition from traditional metal bulletproof materials to lightweight bulletproof materials. As the third generation of bulletproof materials, high-performance polymer fiber materials such as Kevlar can absorb the energy of bullets through elastic deformation. At present, composite structure bulletproof plates are more about bonding ceramic materials to metal, polymer material plates or high-performance material surfaces. They have simple structures, weak forces, and fail to achieve maximum anti-penetration and energy absorption performance. After being impacted by high-speed bullets, the ceramic layer of this type of bulletproof plate is very likely to produce high-speed ceramic fragments that penetrate the backing material. The polymer material layer as a backing material has limited protection for the human body and is very likely to produce a considerable depth of depression under the impact of bullets and high-speed ceramic fragments, causing blunt secondary injuries to the defender. In addition, while bulletproof plates have both impact resistance, achieving weight reduction and thickness reduction is also one of the main tasks of bulletproof materials. Therefore, how to improve impact resistance and achieve weight reduction and thickness reduction at the same time is an important topic for the research and improvement of bulletproof plates. Summary of the invention

[0003] In order to solve the above technical problems, the object of the present invention is achieved through the following technical solutions: providing a multi-layer composite structure bulletproof insert, which comprises an anti-strike layer, a sandwich structure layer and a bottom buffer layer in sequence; The anti-strike layer comprises a high-performance fiber woven cloth layer, a ceramic layer and a titanium alloy plate stacked in sequence; The sandwich structure layer comprises a composite hard plate, a chopped fiber honeycomb layer and a high-performance fiber composite material plate stacked in sequence; the composite hard plate is composed of two layers of high-performance fiber composite material plates sandwiched by a titanium alloy plate.

[0004] Preferably, the impact-resistant layer, the sandwich structure layer and the bottom buffer layer are bonded and fixed by adhesive.

[0005] In the impact-resistant layer, the ceramic layer is bonded to the high-performance fiber warp and weft woven cloth through carbon fiber impregnation adhesive, and is bonded to the titanium alloy plate through acrylic high-performance special adhesive.

[0006] Specifically, the ceramic layer is composed of ceramic sheets closely arranged and spliced; the shape of the ceramic sheet is a regular hexagonal prism, a regular quadrangular prism, or a regular hexagonal prism, a hexahedron, or an octahedron with a concave end face; preferably a regular hexagonal prism ceramic sheet; the ceramic sheet is selected from at least one of an alumina ceramic sheet, a silicon carbide ceramic sheet, a boron carbide ceramic sheet, and a boron nitride ceramic sheet. Preferably, the thickness of the ceramic sheet is 8 to 15 mm, and the side length of the ceramic sheet is adjusted in the range of 20 to 30 mm according to the protection area requirements, and a regular hexagonal prism ceramic sheet with a side length of 20 mm is preferably selected.

[0007] The high-performance fiber woven fabric layer is a high-performance fiber warp and weft woven fabric, such as carbon fiber warp and weft woven fabric, aramid fiber warp and weft woven fabric, poly(p-phenylene benzobisoxazole) fiber warp and weft woven fabric, or ultra-high molecular weight polyethylene fiber warp and weft woven fabric; preferably 0° / 90° biaxial aramid fiber warp and weft woven fabric. More preferably, the thickness of the high-performance fiber woven fabric layer is 0.2-1 mm.

[0008] The titanium alloy plate is a TC4 titanium alloy plate with a thickness of 0.5 to 2 mm.

[0009] The sandwich structure layer is composed of a composite hard board, a high-performance fiber composite material board and a chopped fiber honeycomb layer, wherein the chopped fiber honeycomb layer is the core between the composite hard board and the high-performance fiber composite material board, and each layer is fixed by bonding with a high-performance special acrylic adhesive.

[0010] The composite hard plate is composed of two layers of high-performance fiber composite material plates sandwiched with titanium alloy plates, and each layer is bonded with acrylic high-performance special adhesive. Specifically, the high-performance fiber composite material plate is selected from carbon fiber plate or poly(p-phenylene benzobisoxazole) fiber plate or aramid fiber plate or glass fiber plate or ultra-high molecular weight polyethylene fiber plate, and is prepared by autoclave molding process, with a thickness of preferably 0.2~1mm. For example, to protect against 7.62mm caliber bullets with a speed of 700~1200m / s, aramid fiber plates and / or carbon fiber plates are preferably used; the titanium alloy plate used in the composite hard plate is preferably a TC4 titanium alloy plate with a thickness of 0.5~2mm.

[0011] The chopped fiber honeycomb layer is selected from aramid fiber honeycomb panels, carbon fiber honeycomb panels, or poly(p-phenylene benzobisoxazole) fiber honeycomb panels, and is prepared by a phenolic resin curing molding process with a thickness of 5 to 10 mm. The wall thickness of the honeycomb structure of the chopped fiber honeycomb layer is 0.04 to 1 mm, and the side length of the honeycomb structure is 1 to 3 mm. The wall thickness and side length of the honeycomb structure can be adjusted according to the protection area requirements, with priority given to wall thickness of 0.04 mm, side length of 1.83 mm, and density not exceeding 50 kg / m 3 .

[0012] In the sandwich structure layer, the high-performance fiber composite material board with the chopped fiber honeycomb layer bonded thereto is the same as the high-performance fiber composite material board in the above-mentioned composite hard board.

[0013] Preferably, the bottom buffer layer is composed of a layer of backing material with a thickness of 4-8 mm (preferably 5 mm), and the backing material can be MTPU, MTPEE, P4U and other materials, and P4U material is preferably used.

[0014] The present invention also provides a method for preparing the multi-layer composite bulletproof insert, comprising the following steps: The high-performance fiber woven cloth layer and the ceramic layer are bonded and fixed by carbon fiber impregnated adhesive, and then the ceramic layer and the titanium alloy plate are bonded and fixed by acrylic high-performance special adhesive to obtain an impact-resistant layer; The two layers of high-performance fiber composite material plates and the sandwiched titanium alloy plate are bonded together by acrylic high-performance special adhesive to form a composite hard plate; the composite hard plate, the chopped fiber honeycomb layer and the high-performance fiber composite material plate are then bonded and fixed by acrylic high-performance special adhesive to obtain a sandwich structure layer; The titanium alloy plate of the impact-resistant layer and the composite hard plate of the sandwich structure layer are bonded by acrylic high-performance special adhesive, and the high-performance fiber composite material plate of the sandwich structure layer and the bottom buffer layer are bonded by acrylic high-performance special adhesive, and a multi-layer composite structure bulletproof insert is obtained after curing.

[0015] In some specific embodiments, before bonding the layers, the surface of each layer of material is polished to enhance the bonding adhesion.

[0016] Preferably, the carbon fiber impregnated adhesive of the present invention can be Shibang 503 carbon fiber impregnated adhesive, and the acrylic high-performance special adhesive can be Kingsbon 1925 acrylic structural adhesive.

[0017] The multi-layer composite structure bulletproof plug plate of the present invention adopts a special structure design of multi-layer composite materials, which can improve the overall bulletproof performance of the bulletproof plug plate and reduce secondary damage to the wearer. Compared with the existing bulletproof plates, it is thinner and lighter, which can reduce the manufacturing cost and improve the production efficiency. The multi-layer composite structure bulletproof plug plate of the present invention can be applied to the field of individual soldier protection equipment and can be expanded to various types of protective armor fields.

[0018] Specifically, the multi-layer composite bulletproof insert of the present invention has the following advantages compared with existing products on the market: (1) The impact-resistant layer of the present invention includes a ceramic layer and a high-performance fiber woven fabric layer. The ceramic layer is composed of ceramic sheets closely arranged and spliced. The non-bonding method between the ceramic sheets can play a buffering role, which can absorb the high-speed impact energy of the bullet to the maximum extent, and also makes it difficult for the stress to spread to the surroundings, thereby reducing the ceramic damage rate and facilitating modular replacement. At the same time, the high-performance fiber woven fabric layer can also well protect the ceramic layer, prevent the ceramic fragments from breaking and splashing, and avoid secondary injuries to the wearer; (2) The sandwich structure layer of the present invention is composed of a layer of composite hard plate and a layer of high-performance fiber composite material plate sandwiched by a layer of short-cut fiber honeycomb layer. The composite hard plate is composed of two layers of high-performance fiber composite material plate and titanium alloy plate, and has a strong impact resistance function and can withstand the splash of small particle fragments; the short-cut fiber honeycomb layer between the composite hard plate and the high-performance fiber composite material plate has the ability to absorb energy and resist deformation; (3) The bottom buffer layer of the present invention can reduce the depth of the bulletproof depression and reduce the damage to the wearer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the explosion of the multi-layer composite structure bulletproof insert plate of Example 1 of the present invention; Figure 2 Schematic diagram of the anti-impact layer in Example 1 of the present invention; Figure 3 This is a schematic diagram of a sandwich structure layer in Example 1 of the present invention; Figure 4 Schematic diagram of the ceramic layer and the titanium alloy plate in Example 1 of the present invention; Figure 5 The bullet-facing surface of the multi-layer composite structure bullet-proof plug plate after the bullet-proof test in Example 1 of the present invention; Figure 6 The back bulletproof surface of the multi-layer composite structure bulletproof plug plate after the bulletproof test in Example 1 of the present invention; Figure 7 The bullet-facing surface of similar bullet-proof plates on the market after bullet-proof testing; Figure 8 The back bullet surface of similar bulletproof plates on the market after bulletproof testing; Fig. 9 This is a schematic diagram of the structure of a ceramic sheet according to Example 2 of the present invention; Fig.10 is a cross-sectional view of a ceramic sheet according to Example 2 of the present invention; Description of the symbols in the figure: 1- impact-resistant layer; 2- sandwich structure layer; 3- bottom buffer layer; 4- acrylic high-performance special glue; 5- acrylic high-performance special glue; 11- ceramic layer; 12- high-performance fiber woven cloth layer; 13- titanium alloy plate; 21- composite hard plate; 22- short fiber honeycomb layer; 23- high-performance fiber composite material plate; 24- acrylic high-performance special glue; 25- acrylic high-performance special glue; 111- ceramic sheet; 1110- round groove. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the following embodiments, the carbon fiber impregnation adhesive is Shibang 503 carbon fiber impregnation adhesive, and the acrylic high-performance special adhesive is Kingsbon 1925 acrylic structural adhesive.

[0023] Example 1 like Figure 1 The multi-layer composite bulletproof insert shown in the figure comprises an anti-strike layer 1, a sandwich structure layer 2 and a bottom buffer layer 3 in sequence. Figure 2 As shown, it includes a high-performance fiber woven cloth layer 12, a ceramic layer 11 and a titanium alloy plate 13 stacked in sequence. The sandwich structure layer 2 is as shown in FIG. Figure 3 As shown, it includes a composite hard board 21, a chopped fiber honeycomb layer 22 and a high-performance fiber composite material board 23 stacked in sequence.

[0024] Specifically, the ceramic layer 11 in the impact-resistant layer 1 is composed of ceramic sheets closely arranged and spliced; the shape of the ceramic sheet is a regular hexagonal prism, a regular quadrangular prism, or a regular hexagonal prism with a concave end face, a hexahedron or an octahedron, with a thickness of 8 to 15 mm and a side length of 20 to 30 mm; the ceramic sheet is selected from at least one of an alumina ceramic sheet, a silicon carbide ceramic sheet, a boron carbide ceramic sheet, and a boron nitride ceramic sheet. In this embodiment, Figure 4 As shown, the ceramic sheet 111 is a regular hexagonal silicon carbide ceramic sheet with a thickness of 8 mm and a side length of 20 mm.

[0025] The high-performance fiber woven fabric layer 12 in the anti-strike layer 1 is a high-performance fiber warp and weft woven fabric, such as carbon fiber warp and weft woven fabric or aramid fiber warp and weft woven fabric or poly(p-phenylene benzobisoxazole) fiber warp and weft woven fabric or ultra-high molecular weight polyethylene fiber warp and weft woven fabric, with a thickness of 0.2 to 1 mm. In this embodiment, the high-performance fiber woven fabric layer 12 is a 0° / 90° biaxial aramid fiber warp and weft woven fabric with a thickness of 0.2 mm.

[0026] The titanium alloy plate 13 in the anti-strike layer 1 is a TC4 titanium alloy plate with a thickness of 0.5-2 mm. In this embodiment, the titanium alloy plate 13 is a TC4 titanium alloy plate with a thickness of 0.5 mm.

[0027] In this embodiment, the ceramic layer 11 is bonded to the high-performance fiber warp and weft woven cloth layer 12 through carbon fiber impregnation adhesive, and bonded to the titanium alloy plate 13 through acrylic high-performance special adhesive to produce the impact-resistant layer 1 of this embodiment.

[0028] The chopped fiber honeycomb layer 22 in the sandwich structure layer 2 is the core between the composite hard board 21 and the high-performance fiber composite material board 23. The composite hard board 21 and the chopped fiber honeycomb layer 22 are bonded by acrylic high-performance special glue 24, and the high-performance fiber composite material board 23 and the chopped fiber honeycomb layer 22 are bonded by acrylic high-performance special glue 25.

[0029] The composite hard plate 21 in the sandwich structure layer 2 is composed of two layers of high-performance fiber composite material plates sandwiched with titanium alloy plates, and each layer is bonded with acrylic high-performance special adhesive. Specifically, the high-performance fiber composite material plate is selected from a carbon fiber plate or a poly(p-phenylene benzobisoxazole) fiber plate or an aramid fiber plate or a glass fiber plate or an ultra-high molecular weight polyethylene fiber plate, and is prepared by a hot press molding process with a thickness of 0.2 to 1 mm. The titanium alloy plate in the composite hard plate is a TC4 titanium alloy plate with a thickness of 0.5 to 2 mm. In this embodiment, the high-performance fiber composite material plate is a carbon fiber plate with a thickness of 0.2 mm, and the titanium alloy plate in the composite hard plate is a TC4 titanium alloy plate with a thickness of 0.5 mm, which can be used to protect against 7.62 mm caliber bullets with a bullet speed of 700 to 1200 m / s.

[0030] The short fiber honeycomb layer 22 in the sandwich structure layer 2 can be made of aramid fiber honeycomb panels, carbon fiber honeycomb panels, or poly(p-phenylene benzobisoxazole) fiber honeycomb panels, which are prepared by a phenolic resin curing molding process and have a thickness of 5 to 10 mm. The honeycomb structure of the short fiber honeycomb layer has a wall thickness of 0.04 to 1 mm, and a side length of 1 to 3 mm. In this embodiment, the short fiber honeycomb layer 22 uses an aramid fiber honeycomb panel, and the honeycomb structure has a wall thickness of 0.04 mm, a side length of 1.83 mm, and a density of 50 kg / m 3 .

[0031] The high-performance fiber composite material board 23 in the sandwich structure layer 2 can be the same as the high-performance fiber composite material board in the composite hard board 21. In this embodiment, the high-performance fiber composite material board 23 in the sandwich structure layer 2 is a carbon fiber board with a thickness of 0.2 mm.

[0032] The bottom buffer layer 3 is composed of a layer of backing material with a thickness of 4-8 mm, and the backing material can be MTPU, MTPEE, P4U and other materials, which can be prepared by vulcanization process. In this embodiment, the backing material of the bottom buffer layer 3 is P4U material with a thickness of 5 mm.

[0033] The preparation method of the multi-layer composite structure bulletproof plug plate in this embodiment is as follows: the titanium alloy plate 13 of the impact-resistant layer 1 and the composite hard plate 21 of the sandwich structure layer 2 are bonded by acrylic high-performance special glue 4, and the high-performance fiber composite material plate 23 of the sandwich structure layer 2 and the bottom buffer layer 3 are bonded by acrylic high-performance special glue 5, and cured for 24 hours, and the cured bulletproof plug plate is glued, and the multi-layer composite structure bulletproof plug plate is cured again for 24 hours to obtain the multi-layer composite structure bulletproof plug plate.

[0034] The multi-layer composite structure bulletproof insert of this embodiment, the ceramic layer 11 in the anti-strike layer 1 is composed of ceramic sheets closely arranged and spliced, and the non-bonding method between the ceramic sheets can play a buffering role. The regular hexagonal ceramic sheet structure can absorb the high-speed impact energy of the bullet to the maximum extent, so that the stress is not easy to spread to the surroundings, reduce the ceramic damage rate, and also facilitate modular replacement. At the same time, the high-performance fiber woven cloth layer 12 can also protect the ceramic layer well, prevent the rupture and splash of ceramic fragments, and avoid the wearer from suffering secondary injuries. The sandwich structure layer 2 is composed of a layer of composite hard plate 21 and a layer of high-performance fiber composite material plate 23 sandwiching a layer of short-cut fiber honeycomb layer 22. The composite hard plate is composed of two layers of high-performance fiber composite material plates sandwiching TC4 titanium alloy plates, which has a strong impact resistance function and can withstand the splash of small particle fragments; the short-cut fiber honeycomb layer has the ability to absorb energy and resist deformation. The bottom buffer layer 3 can reduce the depth of the bulletproof depression and reduce the damage to the wearer.

[0035] The bullet-proof surface of the multi-layer composite structure bullet-proof insert of this embodiment after the bullet-proof test (7.62mm caliber bullet, bullet speed 1200m / s) is as follows Figure 5 As shown, the back surface is Figure 6 As shown. Figure 6 It can be seen that the back bullet surface of the multi-layer composite structure bulletproof insert of this embodiment has zero depression. Figure 7 As shown, the back surface is Figure 8 shown.

[0036] By comparison, it can be seen that the multi-layer composite structure bulletproof insert of this embodiment can improve the ballistic performance and reduce the secondary damage to the wearer. Compared with the existing bulletproof plates, it is thinner and lighter, which can reduce the manufacturing cost and improve the production efficiency.

[0037] Example 2 The multi-layer composite bulletproof insert of this embodiment is different from that of embodiment 1 in that the ceramic sheet used in this embodiment is as follows: Fig. 9 and Fig.10 As shown, one end surface of the ceramic sheet 111 is provided with a concave circular groove 1110, the maximum depth of the circular groove 1110 is 1.5 mm, and the diameter is 16 mm. Other structures are the same as those of the multi-layer composite structure bulletproof insert plate of Example 1.

[0038] Example 3 The multi-layer composite bulletproof insert of this embodiment is different from that of Embodiment 1 in that: In the impact-resistant layer 1 , the ceramic sheet of the ceramic layer 11 is a regular tetrahedral alumina ceramic sheet with a thickness of 15 mm and a side length of 30 mm, the high-performance fiber woven cloth layer 12 is a carbon fiber warp and weft woven cloth with a thickness of 2 mm, and the titanium alloy plate 13 is a TC4 titanium alloy plate with a thickness of 2 mm.

[0039] In the sandwich structure layer 2, the high-performance fiber composite material plate of the composite hard plate 21 is a poly(p-phenylene benzobisoxazole) fiber plate with a thickness of 1 mm, and the titanium alloy plate of the composite hard plate is a TC4 titanium alloy plate with a thickness of 2 mm; the short-cut fiber honeycomb layer 22 adopts a poly(p-phenylene benzobisoxazole) fiber honeycomb plate with a thickness of 10 mm, and the wall thickness of the honeycomb structure is 1 mm, the side length is 3 mm, and the density is 50 kg / m 3 The high-performance fiber composite material board 23 is a poly(p-phenylene benzobisoxazole) fiberboard with a thickness of 1 mm.

[0040] The backing material of the bottom buffer layer 3 is MTPU material with a thickness of 8 mm.

[0041] The other structures are the same as those of the multi-layer composite bulletproof insert plate of Example 1.

[0042] Example 4 The multi-layer composite bulletproof insert of this embodiment is different from that of Embodiment 2 in that: In the impact-resistant layer 1, the ceramic sheet of the ceramic layer 11 is an octahedral boron carbide ceramic sheet with a thickness of 10 mm and a side length of 25 mm, the high-performance fiber woven cloth layer 12 is an ultra-high molecular weight polyethylene fiber warp and weft woven cloth with a thickness of 1 mm, and the titanium alloy plate 13 is a TC4 titanium alloy plate with a thickness of 1 mm.

[0043] In the sandwich structure layer 2, the high-performance fiber composite material plate of the composite hard plate 21 is an ultra-high molecular weight polyethylene fiber plate with a thickness of 0.6 mm, and the titanium alloy plate of the composite hard plate is a TC4 titanium alloy plate with a thickness of 1 mm; the short-cut fiber honeycomb layer 22 adopts a poly(p-phenylene benzobisoxazole) fiber honeycomb plate with a thickness of 8 mm, and the wall thickness of the honeycomb structure is 0.5 mm, the side length is 2 mm, and the density is 50 kg / m 3; The high-performance fiber composite material board 23 is an ultra-high molecular weight polyethylene fiber board with a thickness of 0.6 mm.

[0044] The backing material of the bottom buffer layer 3 is MTPEE material with a thickness of 6 mm.

[0045] The other structures are the same as those of the multi-layer composite bulletproof insert plate of Example 1.

[0046] It should be noted that as the thickness of each layer of the multi-layer composite structure bulletproof plug plate increases, its impact resistance is improved, but the overall thickness and weight also increase accordingly. Therefore, the multi-layer composite structure bulletproof plug plate of the technical solution of the present invention can achieve the effect of balanced impact resistance, thickness and weight.

[0047] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A multi-layer composite bulletproof plate, characterized in that: It includes an anti-impact layer, a sandwich structure layer and a bottom buffer layer in sequence; The anti-strike layer comprises a high-performance fiber woven cloth layer, a ceramic layer and a titanium alloy plate stacked in sequence; The sandwich structure layer comprises a composite hard plate, a chopped fiber honeycomb layer and a high-performance fiber composite material plate stacked in sequence; the composite hard plate is composed of two layers of high-performance fiber composite material plates sandwiched by a titanium alloy plate.

2. The multi-layer composite bulletproof insert according to claim 1, characterized in that: The ceramic layer is composed of ceramic sheets arranged closely and spliced ​​together. The shape of the ceramic sheets is a regular hexagonal prism, a regular quadrangular prism, or a regular hexagonal prism, a hexahedron, or an octahedron with a concave end face. The ceramic sheets are selected from at least one of alumina ceramic sheets, silicon carbide ceramic sheets, boron carbide ceramic sheets, and boron nitride ceramic sheets.

3. The multi-layer composite bulletproof insert according to claim 2, characterized in that: The ceramic sheet has a thickness of 8-15 mm and a side length of 20-30 mm.

4. The multi-layer composite bulletproof insert according to claim 3, characterized in that: The high-performance fiber woven cloth layer is selected from carbon fiber warp and weft woven cloth, aramid fiber warp and weft woven cloth, poly(p-phenylene benzobisoxazole) fiber warp and weft woven cloth, or ultra-high molecular weight polyethylene fiber warp and weft woven cloth.

5. The multi-layer composite bulletproof insert according to claim 1, characterized in that: The titanium alloy plate is a TC4 titanium alloy plate with a thickness of 0.5-2 mm.

6. The multi-layer composite bulletproof insert according to claim 1, characterized in that: The high-performance fiber composite material board is selected from carbon fiber board, poly(p-phenylene benzobisoxazole) fiber board, aramid fiber board, glass fiber board or ultra-high molecular weight polyethylene fiber board.

7. The multi-layer composite bulletproof insert according to claim 6, characterized in that: The high-performance fiber composite material plate has a thickness of 0.2-1 mm.

8. The multi-layer composite bulletproof insert according to claim 1, characterized in that: The chopped fiber honeycomb layer is selected from aramid fiber honeycomb panels, carbon fiber honeycomb panels, or poly(p-phenylene benzobisoxazole) fiber honeycomb panels.

9. The multi-layer composite bulletproof insert according to claim 8, characterized in that: The thickness of the chopped fiber honeycomb layer is 5-10 mm; the wall thickness of the honeycomb structure of the chopped fiber honeycomb layer is 0.04-1 mm, and the side length of the honeycomb structure is 1-3 mm.

10. The method for preparing a multi-layer composite bulletproof insert according to any one of claims 1 to 9, characterized in that: The following steps are involved: The high-performance fiber woven cloth layer and the ceramic layer are bonded and fixed by carbon fiber impregnated adhesive, and then the ceramic layer and the titanium alloy plate are bonded and fixed by acrylic high-performance special adhesive to obtain an impact-resistant layer; The two layers of high-performance fiber composite material plates and the sandwiched titanium alloy plate are bonded together by acrylic high-performance special adhesive to form a composite hard plate; the composite hard plate, the chopped fiber honeycomb layer and the high-performance fiber composite material plate are then bonded and fixed by acrylic high-performance special adhesive to obtain a sandwich structure layer; The titanium alloy plate of the impact-resistant layer and the composite hard plate of the sandwich structure layer are bonded by acrylic high-performance special adhesive, and the high-performance fiber composite material plate of the sandwich structure layer and the bottom buffer layer are bonded by acrylic high-performance special adhesive, and a multi-layer composite structure bulletproof insert is obtained after curing.

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