A combined bulletproof plate and preparation method thereof

Abstract

The present invention relates to the technical field of bulletproof armor plates, and in particular to a combined bulletproof plate and a preparation method thereof. The combined bulletproof plate comprises a shear-resistant layer, a tensile-resistant layer and an anti-deformation layer which are stacked in sequence; the shear-resistant layer accounts for 5%-30% of the total mass of the combined bulletproof plate; the tensile-resistant layer accounts for 40%-90% of the total mass of the combined bulletproof plate; the anti-deformation layer accounts for 5%-30% of the total mass of the combined bulletproof plate; the shear-resistant layer comprises a first polyethylene fiber non-weft composite cloth; the tensile-resistant layer comprises a second polyethylene fiber non-weft composite cloth; the anti-deformation layer comprises a third polyethylene fiber non-weft composite cloth. The present invention improves the anti-ballistic performance and convexity reduction performance of bulletproof armor by setting up three different functional areas of anti-shear layer, anti-tensile layer and anti-deformation layer.

Description

Technical Field

[0001] The invention relates to the technical field of bulletproof armor plates, and in particular to a combined bulletproof plate and a preparation method thereof. Background Art

[0002] Lightweight bulletproof armor equipment mainly includes bulletproof armor plates, bulletproof inserts and bulletproof helmets. When defending against bullet damage, bulletproof armor mainly faces two types of damage: penetration damage; and when it fails to penetrate, the high-speed impact of the bullet and the deformation of the bulletproof material cause impact damage to the human body or equipment.

[0003] At present, lightweight bulletproof armor equipment mainly uses non-woven composite fabrics made of ultra-high molecular weight polyethylene fibers and adhesives as bulletproof materials, which are made by hot pressing. Its bulletproof mechanism mainly includes: fiber shear fracture energy absorption of the bullet-facing surface material, fiber tensile fracture and delamination energy absorption of the middle layer, and tensile bulging energy absorption of the back material. These mechanisms together consume the kinetic energy of the bullet head (or fragments), thereby achieving the purpose of bulletproof.

[0004] At present, the ultra-high molecular weight polyethylene fiber bulletproof plates are basically made of the same non-woven composite fabric and structure laminated by hot pressing, which makes it difficult to take into account the performance of the ultra-high molecular weight polyethylene fiber material in terms of bulletproof and back convexity reduction. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a combined bulletproof plate and a preparation method thereof, which has the advantages of both anti-ballistic performance and back convexity reduction, and is used to solve the problems in the prior art.

[0006] To achieve the above-mentioned purpose and other related purposes, one aspect of the present invention provides a combined bullet-proof plate, which comprises a shear-resistant layer, a tensile-resistant layer and an anti-deformation layer which are stacked in sequence; the shear-resistant layer accounts for 5%-30% of the total mass of the combined bullet-proof plate; the tensile-resistant layer accounts for 40%-90% of the total mass of the combined bullet-proof plate; the anti-deformation layer accounts for 5%-30% of the total mass of the combined bullet-proof plate; the shear-resistant layer comprises multiple layers of a first polyethylene fiber non-weft composite cloth; the tensile-resistant layer comprises multiple layers of a second polyethylene fiber non-weft composite cloth; the anti-deformation layer comprises multiple layers of a third polyethylene fiber non-weft composite cloth.

[0007] In some embodiments of the present invention, the content of ultra-high molecular weight polyethylene fiber in the first polyethylene fiber non-weft composite fabric is 85% to 95%; preferably, the molecular weight of the ultra-high molecular weight polyethylene fiber is 2 million to 5 million; the crystallinity of the ultra-high molecular weight polyethylene fiber is greater than 80%, and the orientation degree is greater than 90%. In some embodiments of the present invention, the first polyethylene fiber non-weft composite fabric includes multiple layers of non-weft fabrics, and the lamination angle of adjacent single layers of the non-weft fabrics is 0 / 90°.

[0008] In some embodiments of the present invention, the impact strength of the material of the first polyethylene fiber non-woven composite fabric in the shear resistance layer is ≥90 kJ / m 2 .

[0009] In some embodiments of the present invention, the content of ultra-high molecular weight polyethylene fibers in the second polyethylene fiber non-weft composite fabric is between 75% and 85%; preferably, the molecular weight of the polyethylene of the ultra-high molecular weight polyethylene fibers is between 2 million and 5 million; the crystallinity of the ultra-high molecular weight polyethylene fibers is greater than 80%, and the orientation degree is greater than 90%.

[0010] In some embodiments of the present invention, the second polyethylene fiber non-woven composite fabric comprises multiple layers of non-woven fabric, and the lamination angle of adjacent single layers of the non-woven fabric is 0 / 90.

[0011] In some embodiments of the present invention, the 180° peel strength of the material of the second polyethylene fiber non-woven composite fabric in the anti-stretching layer is 1 kN / m to 10 kN / m.

[0012] In some embodiments of the present invention, the content of ultra-high molecular weight polyethylene fibers in the third polyethylene fiber non-weft composite fabric is between 70% and 85%; preferably, the molecular weight of the ultra-high molecular weight polyethylene fibers is between 2 million and 5 million; the crystallinity of the ultra-high molecular weight polyethylene fibers is greater than 80%, and the orientation degree is greater than 90%.

[0013] In some embodiments of the present invention, the third polyethylene fiber non-woven composite fabric comprises multiple layers of non-woven fabrics, and the lamination angles of adjacent single layers of the non-woven fabrics are 0 / 90° / 45° / 135°.

[0014] In some embodiments of the present invention, the bending modulus of the material of the third polyethylene fiber non-woven composite fabric in the anti-deformation layer is 5 GPa to 30 GPa.

[0015] In some embodiments of the present invention, the surface density of the combined bulletproof plate is 5 kg / m 2 ~30kg / m 2 .

[0016] Another aspect of the present invention provides a method for preparing the aforementioned combined bulletproof plate of the present invention, comprising sequentially stacking and hot-pressing an anti-shear layer, an anti-stretch layer and an anti-deformation layer into one.

[0017] In some embodiments of the present invention, the hot pressing pressure is 10-30 MPa; the processing temperature is 120-145° C.; and the heat preservation and pressure holding time is 10-150 min.

[0018] Another aspect of the present invention provides the use of the combined bulletproof plate according to the present invention in lightweight bulletproof armor equipment.

[0019] Compared with the prior art, the combined bulletproof plate of the present invention has the following beneficial effects:

[0020] The combined bulletproof plate of the present invention is a multi-layer combined bulletproof plate, which combines the bulletproof mechanism of ultra-high molecular weight polyethylene fiberboard and improves the bulletproof performance and back convexity reduction performance of the bulletproof armor by setting up three different functional areas of anti-shear layer, anti-stretch layer and anti-deformation layer. Among them: 1. The shear-resistant layer has an ultra-high content of ultra-high molecular weight polyethylene fibers and excellent impact resistance, which can give full play to the ability of ultra-high molecular weight polyethylene fibers to resist shear fracture on the bullet-facing surface of the bullet-proof armor plate and fully absorb the impact energy of the bullet head; 2. The tensile-resistant layer located in the middle of the armor has appropriate ultra-high molecular weight polyethylene fibers and glue content, which can give full play to the tensile pull-out fracture and bonding and delamination energy absorption capacity of ultra-high molecular weight polyethylene fibers between layers; 3. The anti-deformation layer is provided with multi-angle ultra-high molecular weight polyethylene fiber non-weft composite cloth lamination, so that the back convex energy absorption of the bulletproof plate is not only concentrated in the 0 / 90° direction (the damaged shape of the back is approximately cross-shaped), but is dispersed to a larger cloth surface (the damaged shape of the back is approximately circular), and at the same time, the bending modulus of the material is controlled to control the deformation of the material, thereby reducing the back convexity of the bulletproof armor and reducing non-penetrating damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Shown is a schematic structural diagram of the combined bulletproof plate of the present invention.

[0022] In the figure,

[0023] 1 Shear-resistant layer

[0024] 2 Anti-stretch layer

[0025] 3 Anti-deformation layer DETAILED DESCRIPTION

[0026] Hereinafter, the embodiments of the combined bulletproof plate and the method for preparing the same are specifically disclosed in detail.

[0027] "Scope" disclosed in the present application is limited in the form of lower limit and upper limit, and a given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a special range. The scope limited in this way can be including end values ​​or not including end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a scope. For example, if the scope of 60-120 and 80-110 is listed for a specific parameter, it is understood that the scope of 60-110 and 80-120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following scope can be all expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In the present application, unless otherwise specified, the numerical range "ab" represents the abbreviation of any real number combination between a and b, wherein a and b are real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0028] After a lot of exploration and experiments, the inventor of the present invention provides a combined bulletproof plate and a preparation method thereof, combining the bulletproof mechanism of ultra-high molecular weight polyethylene fiberboard, and improving the bulletproof performance and back convexity reduction performance of the bulletproof armor by setting up three different functional areas of anti-shear layer 1, anti-stretching layer 2 and anti-deformation layer 3. On this basis, the present invention was completed.

[0029] A first aspect of the present invention provides a combined bulletproof plate, which comprises a shear-resistant layer 1, a tensile-resistant layer 2 and an anti-deformation layer 3 which are stacked in sequence; the shear-resistant layer 1 accounts for 5%-30% of the total mass of the combined bulletproof plate; the tensile-resistant layer 2 accounts for 40%-90% of the total mass of the combined bulletproof plate; the anti-deformation layer 3 accounts for 5%-30% of the total mass of the combined bulletproof plate; the shear-resistant layer 1 comprises multiple layers of a first polyethylene fiber non-weft composite cloth; the tensile-resistant layer 2 comprises multiple layers of a second polyethylene fiber non-weft composite cloth; the anti-deformation layer 3 comprises multiple layers of a third polyethylene fiber non-weft composite cloth.

[0030] In the combined bulletproof plate provided by the present invention, the content of ultra-high molecular weight polyethylene fiber in the first polyethylene fiber non-weft composite cloth is 85% to 95%; preferably, the molecular weight of the ultra-high molecular weight polyethylene fiber is 2 million to 5 million; the crystallinity of the ultra-high molecular weight polyethylene fiber is greater than 80%, and the orientation degree is greater than 90%. The components other than the ultra-high molecular weight polyethylene fiber in the first polyethylene fiber non-weft composite cloth are glue.

[0031] In the combined bulletproof plate provided by the present invention, the first polyethylene fiber non-weft composite cloth includes multiple layers of non-weft cloth, and the lamination angle of adjacent single-layer non-weft cloth is 0 / 90°. The lamination angle of adjacent single-layer non-weft cloth is 0 / 90°. 0 degrees means that the ultra-high molecular weight polyethylene fiber is a unidirectional cloth, and multiple bundles of fibers are arranged neatly in one direction and then bonded with an adhesive. [0 / 90°] compounding means that a 0-degree unidirectional cloth is rotated 90° and then laminated with another 0-degree unidirectional cloth.

[0032] In the combined bulletproof plate provided by the present invention, the impact strength of the material of the first polyethylene fiber non-woven composite fabric in the anti-shear layer 1 is ≥90 kJ / m 2 . Preferably greater than 120 kJ / m 2 .

[0033] In the combined bulletproof plate provided by the present invention, the content of ultra-high molecular weight polyethylene fiber in the second polyethylene fiber non-weft composite cloth is 75% to 85%; preferably, the molecular weight of the ultra-high molecular weight polyethylene fiber is 2 million to 5 million; the crystallinity of the ultra-high molecular weight polyethylene fiber is greater than 80%, and the orientation degree is greater than 90%. The components other than the ultra-high molecular weight polyethylene fiber in the second polyethylene fiber non-weft composite cloth are glue.

[0034] In the combined bulletproof plate provided by the present invention, the second polyethylene fiber non-weft composite fabric comprises multiple layers of non-weft fabric, and the lamination angle of adjacent single layers of the non-weft fabric is 0 / 90°. 0 degrees means that the ultra-high molecular weight polyethylene fiber is a unidirectional fabric, and multiple bundles of fibers are arranged neatly in one direction and then bonded with an adhesive. [0 / 90°] lamination means that a 0-degree unidirectional fabric is rotated 90° and then laminated with another 0-degree unidirectional fabric.

[0035] In the combined bulletproof plate provided by the present invention, the 180° peel strength of the material of the second polyethylene fiber non-woven composite fabric in the stretch-resistant layer 2 is 1 kN / m to 10 kN / m. Too low (lower than 1 kN / m) or too high (higher than 10 kN / m) peel strength is not conducive to the tensile pull-out fracture of the ultra-high molecular weight polyethylene fiber and the bonding delamination energy absorption capacity between layers. In some embodiments, the 180° peel strength of the material of the second polyethylene fiber non-woven composite fabric in the stretch-resistant layer 2 can also be 1 kN / m to 3 kN / m, 3 kN / m to 5 kN / m, 5 kN / m to 8 kN / m, or 8 kN / m to 10 kN / m, etc.

[0036] In the combined bulletproof plate provided by the present invention, the content of ultra-high molecular weight polyethylene fiber in the third polyethylene fiber non-weft composite cloth is 70% to 85%; preferably, the molecular weight of the ultra-high molecular weight polyethylene fiber is 2 million to 5 million; the crystallinity of the ultra-high molecular weight polyethylene fiber is greater than 80%, and the orientation degree is greater than 90%. The components other than the ultra-high molecular weight polyethylene fiber in the third polyethylene fiber non-weft composite cloth are glue.

[0037] In the combined bulletproof plate provided by the present invention, the bending modulus of the material of the anti-deformation layer 3 is 5Gpa to 30Gpa. If the bending modulus is too low (for example, the bending modulus is lower than 5Gpa), the material deformation is large, which is easy to cause non-penetrating impact damage. Although the bending modulus is high (for example, higher than 30Gpa), it is conducive to controlling deformation, but it is not conducive to the deformation energy absorption of the material, affecting the anti-ballistic performance of the bulletproof plate. In some embodiments, the bending modulus of the material of the anti-deformation layer 3 can be, for example, 5Gpa to 10Gpa, 10Gpa to 15Gpa, 15Gpa to 20Gpa, 20Gpa to 25Gpa, or 25Gpa to 30Gpa.

[0038] In the combined bulletproof plate provided by the present invention, the third polyethylene fiber non-weft composite cloth includes multiple layers of non-weft cloth, and the lamination angle of the adjacent single-layer non-weft cloth is 0 / 90° / 45° / 135°. The multi-angle composite is beneficial to disperse the impact energy of the bullet to a larger bulletproof cloth surface. The 0° unidirectional cloth can be rotated to 45°, 135° or any angle, and then laminated with another 0° unidirectional cloth. The angle can take a range value, and the 0 / 90° / 45° / 135° composite angle is the optimal solution for taking into account both anti-impact deformation and anti-ballistic performance.

[0039] In the combined bulletproof plate provided by the present invention, the surface density of the combined bulletproof plate can be 5kg / m 2 ~30kg / m 2 , 5kg / m 2 ~10kg / m 2 , 10kg / m 2 ~15kg / m 2 , 15kg / m 2 ~20kg / m 2 , 20kg / m 2 ~25kg / m 2 , or 25kg / m 2 ~30kg / m 2 wait.

[0040] A second aspect of the present invention provides a method for preparing a combined bulletproof plate, comprising sequentially stacking and hot-pressing an anti-shear layer 1, an anti-tensile layer 2 and an anti-deformation layer 3 into one.

[0041] In the method for preparing the combined bulletproof plate provided by the present invention, the hot pressing pressure is 10-30 MPa; the processing temperature is 120-145° C.; and the heat preservation and pressure holding time is 10-150 min.

[0042] In some embodiments, the pressure may be, for example, 10-20 MPa, 20-30 MPa, 10-15 MPa, 15-20 MPa, 20-25 MPa, or 25-30 MPa.

[0043] In some embodiments, the processing temperature may be, for example, 120-130°C, 130-145°C, 120-125°C, 125-130°C, 130-135°C, 135-140°C, or 140-145°C.

[0044] In some embodiments, the heat preservation and pressure preservation time can be, for example, 10-50 min, 50-100 min, or 100-150 min.

[0045] The third aspect of the present invention provides the use of the combined bulletproof plate as described in the first aspect of the present invention in lightweight bulletproof armor equipment.

[0046] In summary, the combined bulletproof plate of the present invention:

[0047] 1. The shear-resistant layer 1 has an ultra-high content of ultra-high molecular weight polyethylene fibers and excellent impact resistance, which can give full play to the ability of ultra-high molecular weight polyethylene fibers to resist shear fracture on the bullet-facing surface of the bullet-proof armor plate and fully absorb the impact energy of the bullet.

[0048] 2. The tensile-resistant layer 2 located in the middle of the armor has appropriate ultra-high molecular weight polyethylene fiber and glue content, which can give full play to the tensile pull-out fracture of the ultra-high molecular weight polyethylene fiber and the bonding delamination energy absorption capacity between layers.

[0049] 3. The anti-deformation layer 3 is provided with a multi-angle ultra-high molecular weight polyethylene fiber non-weft composite cloth laminate, so that the back convex energy absorption of the bulletproof plate is not only concentrated in the 0 / 90° direction (the damaged shape of the back is approximately cross-shaped), but is dispersed to a larger cloth surface (the damaged shape of the back is approximately circular). At the same time, by controlling the bending modulus of the material, the deformation of the material is controlled, thereby reducing the back convexity of the bulletproof armor and reducing non-penetrating damage.

[0050] The beneficial effects of the present invention are further illustrated below in conjunction with embodiments.

[0051] In order to make the invention purpose, technical scheme and beneficial technical effect of the present invention clearer, the present invention is further described in detail below in conjunction with examples. However, it should be understood that the examples of the present invention are only for explaining the present invention, not for limiting the present invention, and the examples of the present invention are not limited to the examples given in the specification. The specific experimental conditions or operating conditions not specified in the examples are made under conventional conditions, or are made under the conditions recommended by the material supplier.

[0052] In addition, it should be understood that one or more method steps mentioned in the present invention do not exclude the existence of other method steps before or after the combination step or the insertion of other method steps between these explicitly mentioned steps, unless otherwise specified; it should also be understood that the combination connection relationship between one or more devices / apparatuses mentioned in the present invention does not exclude the existence of other devices / apparatuses before or after the combination device / apparatus or the insertion of other devices / apparatuses between these explicitly mentioned two devices / apparatuses, unless otherwise specified. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or the scope of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the present invention without substantially changing the technical content.

[0053] In the following examples, the reagents, materials and instruments used are all commercially available unless otherwise specified.

[0054] In each embodiment, the impact strength of the material is tested with reference to GB / T1451-2005 fiber reinforced plastic simply supported beam impact toughness test method.

[0055] The 180° peel strength of the material is tested with reference to GB / T 2791-1995 Adhesive T peel strength test method.

[0056] The bending modulus of the material is tested with reference to GB / T 1449-2005 Test method for bending properties of fiber reinforced plastics.

[0057] Ultra-high molecular weight polyethylene fiber was purchased from Jiangsu Jiujiujiu Technology Co., Ltd. J200.

[0058] Example 1

[0059] Use a flat plate press to press a block with a surface density of 18kg / m at a pressure of 20MPa and a temperature of 135℃ for 90 minutes. 2 The combined ultra-high molecular weight polyethylene fiber bulletproof plate specifically includes, starting from the bullet-facing surface: 20% of the shear-resistant layer 1, of which the ultra-high molecular weight polyethylene fiber content accounts for 90%, and the impact strength of the shear-resistant layer 1 material is 120kJ / m 2; 50% of the anti-stretching layer 2, of which the ultra-high molecular weight polyethylene fiber content accounts for 80%, and the 180° peel strength of the anti-stretching layer 2 material is 2.53kN / m; 30% of the anti-deformation layer 3, of which the ultra-high molecular weight polyethylene fiber content accounts for 80%, and each single layer of non-weft cloth is superimposed and compounded at 0 / 90° / 45° / 135°, and the bending modulus of the anti-deformation layer 3 material is 11Gpa.

[0060] Among them, 20% of the anti-shear layer 1 means that the anti-shear layer 1 accounts for 20% of the total mass of the combined bulletproof plate. 50% of the anti-stretch layer 2 means that the anti-stretch layer 2 accounts for 50% of the total mass of the combined bulletproof plate. 30% of the anti-deformation layer 3 means that the anti-deformation layer 3 accounts for 30% of the total mass of the combined bulletproof plate. The explanations of the remaining embodiments are the same here.

[0061] Example 2

[0062] Use a flat plate press to press a block with a surface density of 18kg / m at a pressure of 30MPa and a temperature of 130℃ for 60 minutes. 2 The combined ultra-high molecular weight polyethylene fiber bulletproof plate includes: 30% shear layer 1, of which the ultra-high molecular weight polyethylene fiber content accounts for 95%, and the rest is glue. The impact strength of the shear layer 1 material is 90kJ / m 2 ; 60% of the anti-stretching layer 2, of which the ultra-high molecular weight polyethylene fiber content accounts for 78%, and the rest is glue. The 180° peel strength of the anti-stretching layer 2 material is 5kN / m; 10% of the anti-deformation layer 3, of which the ultra-high molecular weight polyethylene fiber content accounts for 80%, and the rest is glue. Each single layer of non-weft fabric is superimposed and compounded at 0 / 90° / 45° / 135°, and the bending modulus of the anti-deformation layer 3 material is 5Gpa.

[0063] Example 3

[0064] Use a flat plate press to press a block with a surface density of 18kg / m at a pressure of 10MPa, a temperature of 140℃, and a heat preservation time of 120 minutes. 2 The combined ultra-high molecular weight polyethylene fiber bulletproof plate includes: 10% shear layer 1, of which the ultra-high molecular weight polyethylene fiber content accounts for 85%, and the rest is glue. The impact strength of the shear layer 1 material is 140kJ / m 2 ; 70% of the anti-stretching layer 2, of which the ultra-high molecular weight polyethylene fiber content accounts for 88%, and the rest is glue. The 180° peel strength of the anti-stretching layer 2 material is 1.79kN / m; 20% of the anti-deformation layer 3, of which the ultra-high molecular weight polyethylene fiber content accounts for 75%, and the rest is glue. Each single layer of non-weft fabric is superimposed and compounded at 0 / 90° / 45° / 135°, and the bending modulus of the anti-deformation layer 3 material is 20Gpa.

[0065] Comparative Example 1

[0066] The same method as in Example 1 was used to press a block with a surface density of 18 kg / m 2 An ultra-high molecular weight polyethylene fiber bulletproof plate, wherein the bulletproof material and structure are consistent with the anti-shear layer 1 in Example 1.

[0067] Comparative Example 2

[0068] The same method as in Example 1 was used to press a block with a surface density of 18 kg / m 2 An ultra-high molecular weight polyethylene fiber bulletproof plate, wherein the bulletproof material and structure are consistent with the anti-stretching layer 2 in Example 1.

[0069] Comparative Example 3

[0070] The same method as in Example 1 was used to press a block with a surface density of 18 kg / m 2 An ultra-high molecular weight polyethylene fiber bulletproof plate, wherein the bulletproof material and structure are consistent with the anti-deformation layer 3 in Example 1.

[0071] Comparative Example 4

[0072] Use a flat plate press to press a block with a surface density of 18kg / m at a pressure of 15MPa, a temperature of 130℃, and a heat preservation time of 120 minutes. 2 The combined ultra-high molecular weight polyethylene fiber bulletproof plate includes, starting from the bullet-facing surface, a 40% shear layer 1, of which the ultra-high molecular weight polyethylene fiber content accounts for 80%, and the rest is glue. The impact strength of the shear layer 1 material is 70kJ / m 2 ; The rest is glue. 40% of the anti-stretching layer 2, of which the ultra-high molecular weight polyethylene fiber content accounts for 70%, and the 180° peel strength of the anti-stretching layer 2 material is 12kN / m; 20% of the anti-deformation layer 3, of which the ultra-high molecular weight polyethylene fiber content accounts for 80%, and the rest is glue. Each single layer of non-weft fabric is superimposed and compounded at 0 / 90°, and the bending modulus of the anti-deformation layer 3 material is 15Gpa.

[0073] The bulletproof plates obtained by pressing the above-mentioned Example 1 and Comparative Examples 1 to 3 were cut into a size of 250×300 mm, and ballistic tests were performed according to the protection level 5 in the GA141-2010 standard, that is, a 1956-style 7.62 mm semi-automatic rifle was used to fire a 1956-style 7.62 mm ordinary bullet (steel core), 3 bullets were fired per plate, and the bullet speed was 725±10 m / s; the experimental data are shown in Table 1.

[0074] Table 1

[0075]

[0076]

[0077] It can be seen from the data in Table 1 that the bulletproof plates pressed according to the method of the present invention in Examples 1-3 can obviously take into account and give full play to the advantages of ultra-high molecular weight polyethylene fiber materials in terms of anti-ballistic performance and back convexity reduction performance.

[0078] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0079] The above is only a preferred embodiment of the present invention, and is not any formal or substantial limitation of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the method of the present invention, and these improvements and supplements should also be regarded as the protection scope of the present invention. Any technician familiar with this profession, without departing from the spirit and scope of the present invention, can make some changes, modifications and evolutions of the technical content disclosed above, which are equivalent embodiments of the present invention; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A combined bulletproof plate, characterized in that: Use a flat plate press to press a block with a surface density of 18kg / m at a pressure of 20MPa and a temperature of 135℃ for 90 minutes. 2 The combined ultra-high molecular weight polyethylene fiber bulletproof plate specifically comprises, starting from the bullet-facing surface: a 20% shear-resistant layer (1), wherein the ultra-high molecular weight polyethylene fiber content accounts for 90%, and the impact strength of the shear-resistant layer (1) material is 120 kJ / m 2 ; 50% of the anti-stretching layer (2), wherein the content of ultra-high molecular weight polyethylene fibers accounts for 80%, and the 180° peel strength of the anti-stretching layer (2) material is 2.53 kN / m; 30% of the anti-deformation layer (3), wherein the content of ultra-high molecular weight polyethylene fibers accounts for 80%, and each single layer of non-wefted fabric is superimposed and composited at 0 / 90° / 45° / 135°, and the bending modulus of the anti-deformation layer (3) material is 11 Gpa.

2. Application of the combined bulletproof plate as claimed in claim 1 in lightweight bulletproof armor equipment.

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