A multi-layered bonded fabric composite board with a rigidity gradient distribution and a preparation method thereof

Abstract

The present invention discloses a multi-layered bonded fabric composite board with a rigidity gradient distribution and a preparation method thereof, comprising a composite board body, wherein a rigidity gradient multi-layered bonded fabric board is integrally formed inside the composite board body, a high-strength plate upper plate is integrally formed at the upper end of the rigidity gradient multi-layered bonded fabric board inside the composite board body, and a high-strength plate bottom plate is integrally formed at the lower end of the rigidity gradient multi-layered bonded fabric board inside the composite board body. The multi-layered bonded fabric composite board with a rigidity gradient distribution described in the present invention and a preparation method thereof are core-spun blended composite of polycarbonate filaments and ultra-high molecular weight polyethylene filaments, and the rigidity gradient can be controlled by controlling the rigidity of the composite core-spun yarn in each layer of fabric and / or controlling the organizational structure of each layer of fabric. On the basis of the multi-layered bonded fabric, the preparation difficulties such as the loading amount, uniformity and gradient of the resin are overcome.

Description

Technical Field

[0001] The invention relates to the technical field of bulletproof material preparation, and in particular to a multi-layered bonded fabric composite plate with a rigidity gradient distribution and a preparation method thereof. Background Art

[0002] The multi-layer bonded fabric composite plate with a rigidity gradient distribution is a high-strength plate. Ultra-high molecular weight polyethylene fiber is one of the basic materials for making bulletproof, fragmentation-proof, and cut-proof products. Through hot lamination composite technology, ultra-high molecular weight polyethylene non-woven fabric can be prepared into bulletproof plates of different thicknesses and surface densities. It has shown excellent protective performance in actual police use and effectively protected the life safety of the wearer. However, in the military field, high-energy firearms and weapons will cause extremely strong shearing effects on bulletproof plates, resulting in interlayer separation of bulletproof plates prepared with multi-layer ultra-high molecular weight polyethylene non-woven fabrics, weakening the protective performance of the bulletproof plates. In order to make up for the defect of weak interlayer shear force resistance of multi-layer ultra-high molecular weight polyethylene non-woven bulletproof plates, the thickness and surface density of military bulletproof plates are constantly increasing to improve their protection level, but the weight of the overall protective equipment is also increasing, which greatly weakens the carrying convenience and wearing comfort of bulletproof equipment. In order to solve the defect of weak shear force resistance of ultra-high molecular weight polyethylene non-woven bulletproof plates, ultra-high molecular weight polyethylene filaments are usually multi-layered and woven to prepare 2.5D or 3D fabric tissue and structure. Multi-layer weaving connects multiple layers of fabric through warp yarn, which greatly enhances the interlayer bonding force of ultra-high molecular weight polyethylene fabrics, and at the same time greatly improves the shear resistance of ultra-high molecular weight polyethylene fabric bulletproof plates, thereby maximizing the bulletproof performance. Existing multi-layered bonded fabric structures and structures are mostly designed to be more than 3 layers, or even reach a thickness of dozens of layers of fabric. Single-layer fabric structures and structures include three basic structures and variable structures. The connection methods between layers include upper-lower bonding method, lower-upper bonding method and combined bonding method, etc. The 2.5D or 3D fabrics developed by multi-layered bonded weaving technology and processes can effectively solve the problem of poor shear resistance of ultra-high molecular weight polyethylene fabrics and their bulletproof plates. With the continuous development of science and technology, people have higher and higher requirements for the manufacturing process of multi-layered bonded fabric composite panels with a rigidity gradient distribution.

[0003] The existing multi-layered bonded fabric composite panels with a rigidity gradient distribution have certain disadvantages when used. First, the resin composite process of the multi-layered bonded fabric has the problem of controlling the uniformity of resin impregnation and the load. For single-layer fabrics, two methods can be used to prepare bulletproof panels: one is to use multi-layer stacking of single-layer fabrics, add resin films (polycarbonate, polyurethane, etc.) between the layers, and then perform hot pressing lamination and composite technology to prepare bulletproof panels; the other is to use vacuum introduction of resin (phenolic resin, epoxy resin, etc.) and curing technology to prepare bulletproof panels after multi-layer stacking of single-layer fabrics. Due to the thickness of the single-layer fabric, Thinner (about 1mm), both methods can achieve controllable resin loading and uniformity, however, the number of layers of multi-layered fabrics is more than 3 layers, or even dozens of layers, the layers are firmly connected, the warp and weft yarns are tight, and the overall structure is dense. It is impossible to use interlayer resin film and hot pressing composite technology to prepare bulletproof plates. If vacuum introduction of resin and curing technology is used, the dense structure and thick thickness of multi-layered fabrics will easily lead to the difficulty in controlling the amount and uniformity of resin injection, resulting in a low product qualification rate, difficult quality control, and not conducive to people's use. In addition, it is difficult to control the mechanical property gradient of multi-layered fabrics. The anti-penetration electrostatic theory believes that the greater the stiffness of the material on the front surface, the better, and the greater the toughness of the material on the back surface, the better, and it has a certain deformation ability, which can effectively diffuse the impact kinetic energy and maximize the energy absorption. Single-layer fabrics can be used to prepare bullet-proof plates with mechanical gradient changes in the thickness direction by changing the interlayer fabric structure and matching and quantifying the resin. For example, the bullet-facing surface uses ultra-high molecular weight polyethylene non-woven fabric, the middle layer uses dense plain weave, and the back-repellent surface uses twill, satin or variable weave, etc. At the same time, suitable resins and their loading amounts are selected to achieve gradient control of mechanical properties in the thickness direction. However, for multi-layered bonded fabrics, even if the changes in the different fabric structures between layers are achieved in the multi-layered bonded structure, the layer loading amount of the resin cannot be effectively controlled, and it is difficult to achieve an effective configuration of the fabric single layer and the resin, resulting in the inability to optimize the bulletproof performance of the multi-layered bonded fabric bulletproof plate, which has a certain adverse effect on people's use process. For this reason, we propose a multi-layered bonded fabric composite plate with a rigidity gradient distribution and a preparation method thereof. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a multi-layered bonded fabric composite plate with a rigidity gradient distribution and a preparation method thereof. Polycarbonate filaments and ultra-high molecular weight polyethylene filaments are blended and composited by core-spun yarns. The rigidity of the composite core-spun yarns in each layer of fabric can be controlled, and / or the organizational structure of each layer of fabric can be controlled to achieve control of the rigidity gradient. On the basis of the multi-layered bonded fabric, the preparation difficulties such as the loading amount, uniformity and gradient of the resin are overcome. The preparation method is simple and has high controllability, which can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a multi-layer bonded fabric composite plate with a rigid gradient distribution and a preparation method thereof, comprising a composite plate main body, wherein a rigid gradient multi-layer bonded fabric plate is integrally formed inside the composite plate main body, a high-strength plate upper plate is integrally formed at the upper end of the rigid gradient multi-layer bonded fabric plate inside the composite plate main body, and a high-strength plate bottom plate is integrally formed at the lower end of the rigid gradient multi-layer bonded fabric plate inside the composite plate main body, and the rigid gradient multi-layer bonded fabric plate comprises ultra-high molecular weight polyethylene filament material, polycarbonate filament material, composite core-spun yarn material, weft yarn material and warp yarn material.

[0006] As a preferred technical solution of the present application, a first solidified frame is fixedly connected to one side of the composite panel body, a second solidified frame is fixedly connected to the other side of the composite panel body, and a metal fiber board surface is fixedly connected to the surface of the composite panel body.

[0007] As a preferred technical solution of the present application, the ultra-high molecular weight polyethylene filament material, polycarbonate filament material, composite core-spun yarn material, weft yarn material, and warp yarn material are woven with a multi-layer bonding fabric and thermally cured into one piece, and the rigid gradient multi-layer bonding fabric plate, high-strength plate bottom plate, and high-strength plate upper plate are thermally cured and laminated into one piece.

[0008] As a preferred technical solution of the present application, the composite board body and the first solidified frame and the second solidified frame are integrally formed by heat-sealing, and the composite board body and the metal fiber board surface are integrally formed by heat-sealing.

[0009] A method for preparing a multi-layer bonded fabric composite plate with a rigidity gradient distribution comprises the following steps:

[0010] S1: Preparation of ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn, coating polycarbonate filaments on the surface of ultra-high molecular weight polyethylene filaments to prepare ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn;

[0011] S2: Preparation of ultra-high molecular weight polyethylene / polycarbonate multi-layer stitching fabric, using ultra-high molecular weight polyethylene filaments as warp yarns and the ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn obtained in step S1 as weft yarns, and weaving the multi-layer stitching fabric to obtain an ultra-high molecular weight polyethylene / polycarbonate multi-layer stitching fabric; controlling the strength and modulus of the ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn in each layer of fabric, and / or controlling the ratio of the weft yarn density to the warp yarn density of the structure of each layer of fabric, thereby achieving control of the rigidity gradient, wherein the surface density of the multi-layer stitching fabric is 0.4-25kg / m 2 ;

[0012] S3: Thermal curing of ultra-high molecular weight polyethylene / polycarbonate multi-layer stitching fabric, thermal curing of the ultra-high molecular weight polyethylene / polycarbonate multi-layer stitching fabric obtained in step S2, and after cooling, a multi-layer stitching fabric composite board with a rigidity gradient distribution is obtained.

[0013] As a preferred technical solution of the present application, in step S2, the weft yarn density is 1.5-1.8 times the warp yarn density, and the number of layers of the ultra-high molecular weight polyethylene / polycarbonate multi-layer binding fabric is 3-50.

[0014] As a preferred technical solution of the present application, in step S1, the ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn is prepared by a heated core-spun spinning technology, the twisting triangle zone temperature of the heated core-spun spinning technology is 115-142°C, the linear density of the ultra-high molecular weight polyethylene filaments is 1500-4500 denier, the linear density of the polycarbonate filaments is 200-800 denier, the twist coefficient of the core-spun yarn is 300-550, and the blending ratio of the ultra-high molecular weight polyethylene filaments to the polycarbonate filaments is 40:60-80:20.

[0015] As a preferred technical solution of the present application, in step S3, the thermal curing molding includes two stages, preheating and thermal curing, in sequence.

[0016] As a preferred technical solution of the present application, the preheating temperature is 150-190°C, the preheating time is 30-60 minutes, the thermal curing temperature is 180-190°C, and the thermal curing time is 10-20 minutes.

[0017] Compared with the prior art, the present invention provides a multi-layered knitted fabric composite plate with a rigidity gradient distribution and a preparation method thereof, which have the following beneficial effects: the multi-layered knitted fabric composite plate with a rigidity gradient distribution and a preparation method thereof, wherein polycarbonate filaments and ultra-high molecular weight polyethylene filaments are blended and composited with core-spun yarns, and the rigidity gradient can be controlled by controlling the rigidity of the composite core-spun yarns in each layer of fabric and / or controlling the organizational structure of each layer of fabric. On the basis of the multi-layered knitted fabric, the preparation difficulties such as the loading amount, uniformity and gradient of the resin are overcome, and the preparation method is simple and highly controllable;

[0018] 1. The method for preparing a spliced ​​fabric composite board with a rigidity gradient distribution provided by the present invention is to prepare polycarbonate into fiber filaments, and then coat the fiber filaments on the surface of ultra-high molecular weight polyethylene filaments to obtain composite core-spun yarns; the composite core-spun yarns are used as weft yarns and ultra-high molecular weight polyethylene filaments are used as warp yarns to weave and heat-cure multi-layer spliced ​​fabrics, and to obtain a multi-layer spliced ​​fabric composite board with a rigidity gradient distribution by controlling the rigidity of the ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarns in each layer of fabric, and / or controlling the structure of each layer of fabric. Based on the multi-layer spliced ​​fabric, the present invention breaks through the preparation difficulties such as the loading amount, uniformity and gradient of the resin, and the preparation method is simple and highly controllable;

[0019] 2. The present invention can obtain composite core-spun yarns with different mechanical properties by controlling the linear density, blending ratio, twist coefficient and other parameters of ultra-high molecular weight polyethylene filaments and polycarbonate filaments. The preparation of the core-spun yarns has high controllability and repeatability, which is convenient for large-scale preparation, and provides spinning yarns with diversified performance for the subsequent preparation of multi-layered knitted fabric composite panels with a gradient rigidity distribution;

[0020] 3. The multi-layered bonded fabric composite board with a rigidity gradient distribution prepared by the present invention has high strength, good toughness, strong shear resistance, can effectively diffuse impact kinetic energy, and maximize energy absorption. It can be used for military protective materials such as bulletproof bunkers, bulletproof shields, bulletproof counters, and vehicle body bulletproof linings. The entire multi-layered bonded fabric composite board with a rigidity gradient distribution has a simple structure, is easy to operate, and has a better effect than traditional methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a schematic diagram of the overall structure of a multi-layered bonded fabric composite board with a rigidity gradient distribution and a preparation method thereof according to the present invention.

[0022] Figure 2 The present invention is a structural schematic diagram of a multi-layer bonded fabric composite board with a rigidity gradient distribution and a method for preparing the same.

[0023] Figure 3 The present invention is a structural schematic diagram of a composite board body in a multi-layer bonded fabric composite board with a rigidity gradient distribution and a preparation method thereof.

[0024] In the figure: 1. Composite board body; 2. Rigid gradient multi-layer bonded fabric board; 3. High-strength board bottom plate; 4. High-strength board upper plate; 5. Polycarbonate filament material; 6. Ultra-high molecular weight polyethylene filament material; 7. Warp yarn material; 8. Weft yarn material; 9. Composite core-spun yarn material; 10. First solidified frame; 11. Metal fiber board surface; 12. Second solidified frame. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific implementation methods.

[0026] like Figure 1-3 As shown, a multi-layer bonded fabric composite plate with a rigidity gradient distribution and a preparation method thereof include a composite plate main body 1, a rigid gradient multi-layer bonded fabric plate 2 is integrally formed inside the composite plate main body 1, a high-strength plate upper plate 4 is integrally formed at the upper end of the rigid gradient multi-layer bonded fabric plate 2 inside the composite plate main body 1, a high-strength plate bottom plate 3 is integrally formed at the lower end of the rigid gradient multi-layer bonded fabric plate 2 inside the composite plate main body 1, and the rigid gradient multi-layer bonded fabric plate 2 includes an ultra-high molecular weight polyethylene filament material 6, a polycarbonate filament material 5, a composite core-spun yarn material 9, a weft yarn material 8 and a warp yarn material 7.

[0027] A first solidifying frame 10 is fixedly connected to one side of the composite board body 1 , a second solidifying frame 12 is fixedly connected to the other side of the composite board body 1 , and a metal fiber board surface 11 is fixedly connected to the surface of the composite board body 1 .

[0028] The ultra-high molecular weight polyethylene filament material 6, polycarbonate filament material 5, composite core-spun yarn material 9, weft yarn material 8, and warp yarn material 7 are woven with multi-layered bonding fabrics and thermally cured into one piece, and the rigid gradient multi-layered bonding fabric plate 2, high-strength plate bottom plate 3, and high-strength plate upper plate 4 are thermally cured and laminated into one piece.

[0029] The composite board body 1 and the first solidified frame 10 and the second solidified frame 12 are integrally formed by heat-sealing, and the composite board body 1 and the metal fiber board surface 11 are integrally formed by heat-sealing.

[0030] A method for preparing a multi-layer bonded fabric composite plate with a rigidity gradient distribution comprises the following steps:

[0031] S1. Preparation of ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn

[0032] The polycarbonate filaments are coated on the surface of the ultra-high molecular weight polyethylene filaments to prepare the ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn.

[0033] Specifically, the ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn is prepared by a heated core-spun spinning technology, and the temperature of the twisting triangle zone of the spinning is 115-142°C.

[0034] The linear density of the ultra-high molecular weight polyethylene filament is 1500-4500 denier, and the linear density of the polycarbonate filament is 200-800 denier. The blending ratio of the ultra-high molecular weight polyethylene filament to the polycarbonate filament is 40:60-80:20. The twist coefficient of the core-spun yarn is 300-550.

[0035] By controlling parameters such as the linear density, blending ratio and twist coefficient of ultra-high molecular weight polyethylene filaments and polycarbonate filaments, composite core-spun yarns with different mechanical properties can be obtained. The preparation of the core-spun yarns is highly controllable and repeatable, which facilitates large-scale preparation and provides spinning yarns with diversified performance for the subsequent preparation of multi-layered bonded fabric composite panels with a gradient stiffness distribution.

[0036] S2. Preparation of ultra-high molecular weight polyethylene / polycarbonate multilayer knitted fabric

[0037] The ultra-high molecular weight polyethylene filament is used as the warp yarn, and the ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn obtained in step S1 is used as the weft yarn to weave a multi-layer binding fabric to obtain an ultra-high molecular weight polyethylene / polycarbonate multi-layer binding fabric; the rigidity gradient is controlled by controlling the strength and modulus of the ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn in each layer of fabric, and / or controlling the weft yarn density and warp yarn density ratio of the weft yarn structure of each layer of fabric, wherein the surface density of the multi-layer binding fabric is 0.4-25kg / m2. In practical applications, the multi-layer structure of the composite board is designed according to the greater the stiffness of the material of the facing surface, the better, and the greater the toughness of the material of the back-rebound surface, the better. For example, the rigidity of the fabric layer close to the facing surface is relatively large, so an ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn with a relatively high content of polycarbonate filaments, a large twist, or a relatively thick polycarbonate filament can be selected as the weft yarn; or, by controlling the parameters such as the fabric structure or surface density of each layer, a fabric layer with greater rigidity is obtained.

[0038] In particular, the weft density is 1.5-1.8 times the warp density. The number of layers of the ultra-high molecular weight polyethylene / polycarbonate multi-layer binding fabric is preferably 3-50 layers, such as 5-10 layers, 10-20 layers, 20-30 layers, and the like.

[0039] S3. Thermosetting of UHMWPE / PC multilayer knitted fabrics

[0040] The ultra-high molecular weight polyethylene / polycarbonate multi-layer stitched fabric obtained in step S2 is thermally cured and formed, and after cooling, a multi-layer stitched fabric composite plate with a rigidity gradient distribution is obtained.

[0041] Specifically, the thermal curing molding includes two stages, preheating and thermal curing. The preheating temperature is 150-190°C and the preheating time is 30-60 minutes; the thermal curing temperature is 180-190°C and the thermal curing time is 10-20 minutes. Through the preheating and thermal curing treatment, the polycarbonate filaments on the surface of the core-spun yarn are gradually softened and melted, achieving adhesion between fabric layers, further overcoming the defect of weak shear force.

[0042] The multi-layered bonded fabric composite board with a rigid gradient distribution prepared by the present invention has high strength, good toughness, strong shear resistance, can effectively diffuse impact kinetic energy, and maximize energy absorption. It can be used for military protective materials such as bulletproof bunkers, bulletproof shields, bulletproof counters, and bulletproof linings for vehicle bodies.

[0043] Example 1

[0044] A method for preparing a three-layer bonded fabric composite panel with a rigidity gradient distribution is carried out according to the following steps:

[0045] a. Preparation of ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn

[0046] The heated core-spun spinning technology is adopted to coat the polycarbonate filament on the surface of the ultra-high molecular weight polyethylene filament to prepare the ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn; wherein, the linear density of the ultra-high molecular weight polyethylene filament is 3000 denier, the linear density of the polycarbonate filament is 500 denier, the temperature of the twisting triangle zone of the spinning is 115-142°C, the blending ratio of ultra-high molecular weight polyethylene / polycarbonate is 60:40, and the twist coefficient of the core-spun yarn is 450;

[0047] b. Preparation of ultra-high molecular weight polyethylene / polycarbonate multilayer knitted fabric

[0048] Using ultra-high molecular weight polyethylene filaments as warp yarns and the ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn obtained in step a as weft yarns to weave a three-layer binding fabric to obtain an ultra-high molecular weight polyethylene / polycarbonate multi-layer binding fabric, wherein the weft yarn density is 1.5 times (first layer), 1.6 times (second layer), and 1.8 times (third layer) of the warp yarn density, respectively;

[0049] c. Thermosetting molding of ultra-high molecular weight polyethylene / polycarbonate multi-layered fabric

[0050] The high molecular weight polyethylene / polycarbonate multilayer knitted fabric obtained in step b is subjected to thermal curing molding, including two steps of preheating and thermal curing, the preheating temperature is 150-190°C, the preheating time is 30-60 minutes, the thermal curing temperature is 180-190°C, the thermal curing time is 10-20 minutes, and the ultra-high molecular weight polyethylene composite plate is obtained after cooling.

[0051] Example 2

[0052] A method for preparing a three-layer knitted fabric composite plate with a rigidity gradient distribution, compared with Example 1, is different in that the blending ratios of ultra-high molecular weight polyethylene / polycarbonate in the weft yarns of the three-layer knitted fabric are 40:60 (first layer), 60:40 (second layer) and 80:20 (third layer) respectively. The rest is substantially the same as Example 1 and will not be repeated here.

[0053] Example 3

[0054] A method for preparing a three-layer knitted fabric composite plate with a rigidity gradient distribution, compared with Example 1, is different in that the twist coefficients of the weft yarns of the three-layer knitted fabric are 300 (first layer), 450 (second layer), and 550 (third layer) in sequence. The rest is substantially the same as Example 1 and will not be repeated here.

[0055] Example 4

[0056] A method for preparing a three-layer knitted fabric composite plate with a rigidity gradient distribution, compared with Example 1, the difference is that in the weft yarn of the three-layer knitted fabric, the linear density of the ultra-high molecular weight polyethylene filament and the polycarbonate filament is 1500 denier and 200 denier (first layer); 2500 denier and 400 denier (second layer); 4500 denier and 800 denier (third layer). The rest is roughly the same as Example 1 and will not be repeated here.

[0057] Table 1 is the performance test results of Examples 1-4

[0058]

[0059] As can be seen from Table 1, the blending ratio of ultra-high molecular weight polyethylene / polycarbonate of the three-layer fabric is set in a gradient, the energy absorption per unit area density BPI increases, and the gradient values ​​of the breaking strength and Young's modulus between the three layers change. The first breaking strength increases, and the breaking strength and Young's modulus of the third layer increase. The twist coefficient and the linear density of ultra-high molecular weight polyethylene filaments and polycarbonate filaments also have an important influence on the gradient value. In actual use, by regulating one factor or multiple factors at the same time, a three-layer bonded fabric composite plate with a rigid gradient distribution with various performances can be obtained to meet application requirements.

[0060] In summary, the preparation method of the bonding fabric composite plate with a rigidity gradient distribution provided by the present invention is to make polycarbonate into fiber filaments, and then coat them on the surface of ultra-high molecular weight polyethylene filaments to obtain composite core-spun yarns; use them as weft yarns and ultra-high molecular weight polyethylene filaments as warp yarns to weave and heat-cure multi-layer bonding fabrics, and by controlling the rigidity of the ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarns in each layer of fabric, and / or controlling the organizational structure of each layer of fabric, a multi-layer bonding fabric composite plate with a rigidity gradient distribution can be obtained. Based on the multi-layer bonding fabric, the present invention breaks through the preparation difficulties such as the loading amount, uniformity and gradient of the resin, and the preparation method is simple and highly controllable. It can be widely used in military protective materials such as bulletproof bunkers, bulletproof shields, bulletproof counters, and bulletproof linings of vehicle bodies.

[0061] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A multi-layered bonded fabric composite panel with a rigidity gradient distribution, comprising a composite panel body (1), characterized in that: The composite plate body (1) has a rigid gradient multilayer knitted fabric plate (2) integrally formed inside, a high-strength plate upper plate (4) integrally formed inside the composite plate body (1) at the upper end of the rigid gradient multilayer knitted fabric plate (2), and a high-strength plate bottom plate (3) integrally formed inside the composite plate body (1) at the lower end of the rigid gradient multilayer knitted fabric plate (2), the rigid gradient multilayer knitted fabric plate (2) comprising an ultra-high molecular weight polyethylene filament material (6), a polycarbonate filament material (5), a composite core-spun yarn material (9), a weft yarn material (8) and a warp yarn material (7); the composite plate body One side of the composite plate body (1) is fixedly connected to a first solidified frame (10), the other side of the composite plate body (1) is fixedly connected to a second solidified frame (12), and the surface of the composite plate body (1) is fixedly connected to a metal fiber board surface (11); the ultra-high molecular weight polyethylene filament material (6), the polycarbonate filament material (5), the composite core-spun yarn material (9), the weft yarn material (8), and the warp yarn material (7) are woven with a multi-layered knitted fabric and thermally cured to form an integral body; the rigid gradient multi-layered knitted fabric board (2), the high-strength plate bottom plate (3), and the high-strength plate upper plate (4) are thermally cured and laminated to form an integral body; The method for preparing the rigidity gradient multilayer bonded fabric plate (2) comprises the following steps: S1: Preparation of ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn, coating polycarbonate filaments on the surface of ultra-high molecular weight polyethylene filaments to prepare ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn; S2: Preparation of ultra-high molecular weight polyethylene / polycarbonate multi-layer stitching fabric, using ultra-high molecular weight polyethylene filaments as warp yarns and the ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn obtained in step S1 as weft yarns, and weaving the multi-layer stitching fabric to obtain an ultra-high molecular weight polyethylene / polycarbonate multi-layer stitching fabric; controlling the strength and modulus of the ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn in each layer of fabric, and / or controlling the ratio of the weft yarn density to the warp yarn density of the structure of each layer of fabric, thereby achieving control of the rigidity gradient, wherein the surface density of the multi-layer stitching fabric is 0.4-25kg / m 2 ; S3: thermal curing of the ultra-high molecular weight polyethylene / polycarbonate multi-layer stitching fabric, thermal curing of the ultra-high molecular weight polyethylene / polycarbonate multi-layer stitching fabric obtained in step S2, and obtaining a rigid gradient multi-layer stitching fabric plate after cooling; In step S2, the weft yarn density is 1.5-1.8 times the warp yarn density, and the number of layers of the ultra-high molecular weight polyethylene / polycarbonate multi-layer binding fabric is 3-50.

2. The multi-layer bonded fabric composite panel with a rigidity gradient distribution according to claim 1, characterized in that: The composite plate body (1) and the first solidified frame (10) and the second solidified frame (12) are integrally formed by heat-sealing, and the composite plate body (1) and the metal fiber plate surface (11) are integrally formed by heat-sealing.

3. The method for preparing a multi-layered bonded fabric composite panel with a rigidity gradient distribution according to claim 1, characterized in that: In step S1, the ultra-high molecular weight polyethylene / polycarbonate composite core-spun yarn is prepared by a heated core-spun spinning technology, the twisting triangle zone temperature of the heated core-spun spinning technology is 115-142°C, the linear density of the ultra-high molecular weight polyethylene filaments is 1500-4500 denier, the linear density of the polycarbonate filaments is 200-800 denier, the twist coefficient of the core-spun yarn is 300-550, and the blending ratio of the ultra-high molecular weight polyethylene filaments to the polycarbonate filaments is 40:60-80:

20.

4. The method for preparing a multi-layered bonded fabric composite panel with a rigidity gradient distribution according to claim 1, characterized in that: In step S3, the thermal curing molding includes two stages: preheating and thermal curing.

5. The method for preparing a multi-layered bonded fabric composite panel with a rigidity gradient distribution according to claim 4, characterized in that: The preheating temperature is 150-190° C., and the preheating time is 30-60 min. The heat curing temperature is 180-190° C., and the heat curing time is 10-20 min.

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