A multi-layered areal density light-weight anti-stab core structure and a preparation method thereof

Abstract

The application discloses a multi-layer level surface density light anti-puncture core piece structure and a preparation method thereof, and belongs to the anti-puncture material field. The application adopts aramid no-woven fabrics with different surface densities, and realizes the adjustment of the surface density by controlling the amount of fibers and adhesive, wherein the low surface density aramid no-woven fabric ranges from 220 to 240 g / m2, and the high surface density aramid no-woven fabric ranges from 340 to 550 g / m2. The structure of the multi-layer level surface density light anti-puncture core piece is that from the puncture-facing surface to the skin-facing surface, the low surface density aramid no-woven fabric is sequentially laminated to the high surface density aramid no-woven fabric. The application realizes the structure design of aramid no-woven fabrics with different surface densities, combines the high surface density aramid no-woven fabric with the low surface density aramid no-woven fabric, improves the anti-puncture performance of the anti-puncture core piece, reduces the layer number of the anti-puncture core piece, reduces the weight of the anti-puncture core piece, realizes the weight reduction purpose, and effectively improves the anti-puncture performance of the aramid no-woven fabric anti-puncture core piece.

Description

TECHNICAL FIELD

[0001] The present application relates to a multi-layer level density light anti-stab chip structure and a preparation method thereof, and belongs to the field of anti-stab materials. BACKGROUND

[0002] Anti-stab materials achieve the anti-stab function by blunting the tip of a knife and hindering the stab of a knife, so that the anti-stab products can effectively resist the stab injury of a knife to the human body. At present, domestic anti-stab clothing products are all prepared and produced by the technical method of woven fabric impregnation. However, there are obvious shortcomings, such as poor wearing comfort, relatively heavy weight, obvious compression feeling after long time wearing, and even serious adverse symptoms such as chest tightness and dizziness, which will seriously affect the action efficiency of the wearer. In the case that the product performance meets the requirements, the customers will prefer light and comfortable products. Therefore, with the increasingly fierce competition in the protection market, the customers' demand for the comfort and lightness of the protection equipment is increasingly significant, and improving the comfort of the anti-stab products, reducing the weight, and ensuring the stability of the performance can make the products more competitive in the market.

[0003] With the development of technology, the anti-stab clothing has experienced the transformation from hard to semi-hard to the current soft anti-stab clothing. Nowadays, the demand for anti-stab products not only requires excellent anti-stab performance, but also pursues wearing comfort and lightness, so it is of great significance to deepen the research and development of high-performance anti-stab materials.

[0004] The related research of flexible anti-stab products mainly involves fiber raw materials, structure design and production process. Ultra-high molecular weight polyethylene fiber, aramid fiber, carbon fiber and glass fiber are commonly used reinforcing materials in flexible anti-stab materials. The laminated and three-dimensional (3D) integral structure can increase the thickness of the material and effectively resist various stab injuries. However, some studies have shown that the laminated and 3D integral structure may consume more preparation time and high production cost, and reduce the softness and flexibility of the flexible anti-stab material.

[0005] Therefore, in order to further improve the anti-penetration performance of the anti-stab chip, reduce the overall weight of the chip, improve the wearing comfort, and reduce the production cost, the present application controls the area density of aramid no-woven fabric, improves the tensile strength of aramid fiber, so that the finished aramid no-woven fabric has better shear resistance, and through the gradient level structure design, the anti-stab performance of the aramid no-woven fabric anti-stab chip is effectively improved. SUMMARY

[0006] The purpose of the present application is to provide a preparation method of a multi-layer level density light anti-stab chip structure, which simplifies the preparation process, reduces the weight of the anti-stab chip, realizes light weight, and at the same time makes the overall structure of the anti-stab chip have better anti-penetration function.

[0007] The application patent is realized by the technical scheme as follows:

[0008] The application firstly provides a preparation method of a multi-level surface density light anti-stabbing core structure, comprising the following steps:

[0009] S1: different surface density aramid unwoven fabrics are woven by controlling the amount of fibers and adhesive, wherein the fiber proportion of low surface density aramid unwoven fabric is 75-79%, and the adhesive proportion is 25-21%; the fiber proportion of high surface density aramid unwoven fabric is 80-85%, and the adhesive proportion is 15-20%;

[0010] S2: the woven aramid unwoven fabric is obtained after heat pressing treatment, wherein the low surface density aramid unwoven fabric is heat pressed for 15 min to obtain low surface density anti-stabbing unwoven fabric with a surface density range of 220-240 g / m2; the high surface density aramid unwoven fabric is heat pressed for 20-25 min to obtain high surface density anti-stabbing unwoven fabric with a surface density range of 340-550 g / m2;

[0011] S3: the anti-stabbing fabrics with different surface densities are stacked in the order of multi-layer low surface density anti-stabbing unwoven fabric to multi-layer high density anti-stabbing unwoven fabric from the stabbing surface to the skin surface, and are stacked with the buffer layer material to form an anti-stabbing core, and the surface density of the anti-stabbing core ranges from 5.38 to 5.50 kg / m2.

[0012] Preferably, in step S1, the fiber stacking direction of the aramid unwoven fabric includes [0° / 90°] double-layer stacking, [0° / 90° / 0°] three-layer stacking, and [0° / 90° / 0° / 90°] four-layer stacking.

[0013] Preferably, in step S3, the number of layers of the low surface density anti-stabbing unwoven fabric is 14-17 layers.

[0014] Preferably, in step S3, the number of layers of the high surface density anti-stabbing unwoven fabric is 3-5 layers.

[0015] Preferably, in step S3, the buffer layer structure is 2-4 layers of single-layer polyethylene foam (PEP) with a thickness of 4-10 mm stacked to form a 12-18 mm thick buffer layer.

[0016] Preferably, if the buffer layer is combined by single layers with different thicknesses, the single layers are stacked from thin to thick.

[0017] The application further provides a multi-level surface density light anti-stabbing core structure prepared by the preparation method of the multi-level surface density light anti-stabbing core structure.

[0018] Compared with the prior art, the application has the following beneficial effects:

[0019] The application provides a multi-layer level density light anti-stab chip structure and a preparation method thereof, and the anti-stab chip is designed in a gradient layer structure by using aramid no-woven fabrics with different densities, so that the anti-stab performance of the anti-stab chip is better than that of a single multi-layer structure with a single density, and the number of layers of the anti-stab chip is reduced by combining the aramid no-woven fabrics with high density and the aramid no-woven fabrics with low density, so that the overall weight of the aramid no-woven fabric type anti-stab chip is effectively reduced, and the anti-stab performance meets the standard requirements of GA68-2019 "Police Anti-Stab Clothing". DETAILED DESCRIPTION

[0020] The application provides a preparation method of a multi-layer level density light anti-stab chip structure, which comprises the following steps:

[0021] S1: aramid no-woven fabrics with different densities are woven by controlling the amount of fibers and adhesive, wherein the fiber content of the aramid no-woven fabric with low density is 75-79%, and the adhesive content is 25-21%; the fiber content of the aramid no-woven fabric with high density is 80-85%, and the adhesive content is 15-20%; wherein the fiber stacking direction of the aramid no-woven fabric includes [0° / 90°] double-layer stacking, [0° / 90° / 0°] three-layer stacking and [0° / 90° / 0° / 90°] four-layer stacking.

[0022] S2: the woven aramid no-woven fabric is subjected to heat pressing to obtain an anti-stab fabric, wherein the aramid no-woven fabric with low density is subjected to heat pressing for 15 min to obtain an anti-stab no-woven fabric with a density range of 220-240 g / m2; the aramid no-woven fabric with high density is subjected to heat pressing for 20-25 min to obtain an anti-stab no-woven fabric with a density range of 340-550 g / m2.

[0023] S3: the anti-stab fabrics with different densities are stacked in a layering order from the anti-stab surface to the skin surface, i.e. from the multi-layer low-density anti-stab no-woven fabric to the multi-layer high-density anti-stab no-woven fabric, and are stacked with a buffer layer material to form an anti-stab chip, and the density range of the anti-stab chip is 5.38-5.50 kg / m2; the number of layers of the low-density anti-stab no-woven fabric is 14-17 layers; the number of layers of the high-density anti-stab no-woven fabric is 3-5 layers; the buffer layer structure is 2-4 layers of polyethylene foam (EPE) with a single layer thickness of 4-10 mm, which are stacked to form a buffer layer with a thickness of 12-18 mm; the same single layer thickness of EPE or different thicknesses of EPE can be combined, and if the buffer layer is combined by using different thicknesses of single layers, the single layers are stacked from thin to thick; the overall thickness of the buffer layer can be within the required range, and the thickness lower than the lower limit cannot achieve effective anti-stabbing, and the upper limit is to control the thickness of the product.

[0024] The use amount and ratio of the fiber and the adhesive of the present application are adjusted according to the original product. The face density of 220-240 g / m2 is a conventional product, and the ratio of the fiber and the adhesive is fixed, and the product is mature. The high face density stab-resistant cloth increases the weight by increasing the amount of fiber and the amount of adhesive, thereby increasing the face density. The hot-pressing treatment time is increased to ensure that the adhesive fully reacts due to the increased amount of adhesive. The fiber ratio of the high face density weftless cloth is higher than that of the low face density weftless cloth to better control the weight of the weftless cloth. The stab-resistant core piece of the single face density stab-resistant cloth has basically the same stab-resistant effect under the same face density (for example, 20 layers of 230 g / m2 core piece and 10 layers of 460 g / m2 core piece). The lower limit of the fiber ratio is 75%. When the amount of fiber is lower than the value, the weftless cloth will have gaps. The upper limit of the fiber ratio is 85%. If the value is higher, the proportion of the adhesive is too low to achieve effective stab resistance. The number of layers of the low face density and high face density stab-resistant cloth is combined according to the range of the face density of the core piece to achieve the corresponding range.

[0025] The following examples are further illustrations of the present application and are not intended to limit the scope of the present application. Any modifications, equivalent replacements, improvements, and the like based on the examples of the present application, which are obtained by those skilled in the art without any creative work, and which are within the spirit and principle of the present application, shall fall within the scope of the present application.

[0026] The raw materials used in the examples include: aramid fiber (Japan Teijin Company, trademark Twaron-2020, linear density 2200 dtex), adhesive (Longsheng Chemical (China) Co., Ltd., water-based polyurethane, solid content 50%)

[0027] Example 1

[0028] The water-based polyurethane aqueous solution is placed in a glue box. The fiber is formed into [0° / 90°] double-layer weftless cloth by dipping, spreading, and laying. The ratio of the fiber and the adhesive of the low face density stab-resistant cloth is 77:23, and the ratio of the fiber and the adhesive of the high face density stab-resistant cloth is 80:20. The weight of the aramid weftless cloth is 1300 g and 1900 g, respectively. After drying, the stab-resistant weftless cloth is cut into a size of 40 mm x 40 mm. The stab-resistant weftless cloth with a face density of 230 g / m2 and 340 g / m2 is obtained after hot-pressing treatment for 15 min and 20 min, respectively.

[0029] The anti-stabbing chip structure is stacked in the order from the stabbing face to the skin side: 16 layers of anti-stabbing non-woven fabric with a surface density of 230 g / m2+ 5 layers of anti-stabbing non-woven fabric with a surface density of 340 g / m2+ 3 layers of EPE with a thickness of 4 mm, the surface density of the aramid anti-stabbing chip is 5.38 kg / m2, and the anti-stabbing performance is tested, and the anti-stabbing performance test is tested according to the standard of Public Security GA68-2019 "Police Anti-stabbing Clothing".

[0030] Example 2

[0031] The aqueous polyurethane aqueous solution is placed in a glue box, the fibers are formed into [0° / 90°] double-layer non-woven fabric by dipping, spreading and laying, the fiber-to-adhesive ratio of the low-density anti-stabbing fabric is 77:23, the fiber-to-adhesive ratio of the high-density anti-stabbing fabric is 80:20, the weight of the aramid non-woven fabric is 1300 g and 1900 g respectively, after drying, the anti-stabbing non-woven fabric is cut into a size of 40 mm x 40 mm, and is subjected to hot pressing treatment for 15 min and 20 min respectively to obtain anti-stabbing non-woven fabric with a surface density of 230 g / m2and 340 g / m2.

[0032] The anti-stabbing chip structure is stacked in the order from the stabbing face to the skin side: 16 layers of anti-stabbing non-woven fabric with a surface density of 230 g / m2+ 5 layers of anti-stabbing non-woven fabric with a surface density of 340 g / m2+ 3 layers of EPE with a thickness of 4 mm, the surface density of the aramid anti-stabbing chip is 5.38 kg / m2, and the anti-stabbing performance is tested, and the anti-stabbing performance test is tested according to the standard of Public Security GA68-2019 "Police Anti-stabbing Clothing".

[0033] Example 3

[0034] The aqueous polyurethane aqueous solution is placed in a glue box, the fibers are formed into [0° / 90°] double-layer non-woven fabric by dipping, spreading and laying, the fiber-to-adhesive ratio of the low-density anti-stabbing fabric is 75:25, the fiber-to-adhesive ratio of the high-density anti-stabbing fabric is 80:20, the weight of the aramid non-woven fabric is 1280 g and 1900 g respectively, after drying, the anti-stabbing non-woven fabric is cut into a size of 40 mm x 40 mm, and is subjected to hot pressing treatment for 15 min and 20 min respectively to obtain anti-stabbing non-woven fabric with a surface density of 220 g / m2and 340 g / m2.

[0035] The anti-stabbing chip structure is stacked in the order from the stabbing face to the skin side: 16 layers of anti-stabbing non-woven fabric with a surface density of 230 g / m2+ 5 layers of anti-stabbing non-woven fabric with a surface density of 340 g / m2+ 3 layers of EPE with a thickness of 4 mm, the surface density of the aramid anti-stabbing chip is 5.38 kg / m2, and the anti-stabbing performance is tested, and the anti-stabbing performance test is tested according to the standard of Public Security GA68-2019 "Police Anti-stabbing Clothing".

[0036] Example 4

[0037] The aqueous polyurethane aqueous solution is placed in a glue box, and the fibers are formed into [0° / 90°] double-layer weftless cloth by dipping, spreading and laying. The fiber-to-adhesive ratio of the low-area-density stab-resistant cloth is 75:25, the fiber-to-adhesive ratio of the high-area-density stab-resistant cloth is 80:20, the weight of the aramid weftless cloth is 1280g and 1900g respectively, and after drying, the stab-resistant weftless cloth is cut into a size of 40mm x 40mm. After 15min and 25min of hot pressing treatment, the area density of the stab-resistant weftless cloth is 235g / m2 and 550g / m2 respectively.

[0038] The structure of the stab-resistant core piece is stacked from the stab-facing surface to the skin-facing surface in the following order: 17 layers of stab-resistant weftless cloth with an area density of 220g / m2 + 5 layers of stab-resistant weftless cloth with an area density of 340g / m2 + 2 layers of 9mm-thick EPE, and the area density of the aramid stab-resistant core piece is 5.49kg / m2. The stab-resistant performance is tested, and the stab-resistant performance test is carried out according to the standard of Public Security GA68-2019 "Police Stab-Resistant Clothing".

[0039] Example 5

[0040] The aqueous polyurethane aqueous solution is placed in a glue box, and the fibers are formed into [0° / 90°] double-layer weftless cloth by dipping, spreading and laying. The fiber-to-adhesive ratio of the low-area-density stab-resistant cloth is 79:21, the fiber-to-adhesive ratio of the high-area-density stab-resistant cloth is 85:15, the weight of the aramid weftless cloth is 1320g and 3050g respectively, and after drying, the stab-resistant weftless cloth is cut into a size of 40mm x 40mm. After 15min and 25min of hot pressing treatment, the area density of the stab-resistant weftless cloth is 240g / m2 and 550g / m2 respectively.

[0041] The structure of the stab-resistant core piece is stacked from the stab-facing surface to the skin-facing surface in the following order: 16 layers of stab-resistant weftless cloth with an area density of 240g / m2 + 3 layers of stab-resistant weftless cloth with an area density of 550g / m2 + 4 layers of 4mm-thick EPE, and the area density of the aramid stab-resistant core piece is 5.49kg / m2. The stab-resistant performance is tested, and the stab-resistant performance test is carried out according to the standard of Public Security GA68-2019 "Police Stab-Resistant Clothing".

[0042] Example 6

[0043] The aqueous polyurethane aqueous solution is placed in a glue box, and the fibers are formed into [0° / 90°] double-layer weftless cloth by dipping, spreading and laying. The fiber-to-adhesive ratio of the low-area-density stab-resistant cloth is 79:21, the fiber-to-adhesive ratio of the high-area-density stab-resistant cloth is 85:15, the weight of the aramid weftless cloth is 1310g and 3050g respectively, and after drying, the stab-resistant weftless cloth is cut into a size of 40mm x 40mm. After 15min and 25min of hot pressing treatment, the area density of the stab-resistant weftless cloth is 235g / m2 and 550g / m2 respectively.

[0044] The anti-stabbing core structure is stacked in the order from the stabbing face to the skin surface as follows: 14 layers of anti-stabbing unidirectional fabric with a surface density of 235 g / m2+ 4 layers of anti-stabbing unidirectional fabric with a surface density of 5500 g / m2+ 1 layer of EPE with a thickness of 4 mm + 1 layer of EPE with a thickness of 10 mm, and the surface density of the aramid anti-stabbing core is 5.49 kg / m2. The anti-stabbing performance is tested, and the anti-stabbing performance test is carried out according to the standard of Public Security GA68-2019 "Police Anti-stabbing Clothing".

[0045] Comparative Example 1

[0046] The aqueous polyurethane solution is placed in a glue box, and the fibers are formed into [0° / 90°] double-layer unidirectional fabric by dipping, spreading and laying. The fiber-to-adhesive ratio of the low-density anti-stabbing fabric is 75:25, and the fiber-to-adhesive ratio of the high-density anti-stabbing fabric is 82:18. The weight of the aramid unidirectional fabric is 1280 g and 2560 g, respectively. After drying, the anti-stabbing unidirectional fabric is cut into a size of 40 mm x 40 mm, and is subjected to hot pressing treatment for 15 min and 22 min, respectively, to obtain anti-stabbing unidirectional fabric with a surface density of 220 g / m2and 460 g / m2.

[0047] The anti-stabbing core structure is stacked in the order from the stabbing face to the skin surface as follows: 16 layers of anti-stabbing unidirectional fabric with a surface density of 220 g / m2+ 4 layers of anti-stabbing unidirectional fabric with a surface density of 460 g / m2+ 3 layers of EPE with a thickness of 5 mm, and the surface density of the aramid anti-stabbing core is 5.36 kg / m2. The anti-stabbing performance is tested, and the anti-stabbing performance test is carried out according to the standard of Public Security GA68-2019 "Police Anti-stabbing Clothing".

[0048] Comparative Example 2

[0049] The aqueous polyurethane solution is placed in a glue box, and the fibers are formed into [0° / 90°] double-layer unidirectional fabric by dipping, spreading and laying. The fiber-to-adhesive ratio of the low-density anti-stabbing fabric is 75:25, and the fiber-to-adhesive ratio of the high-density anti-stabbing fabric is 82:18. The weight of the aramid unidirectional fabric is 1280 g and 2560 g, respectively. After drying, the anti-stabbing unidirectional fabric is cut into a size of 40 mm x 40 mm, and is subjected to hot pressing treatment for 15 min and 22 min, respectively, to obtain anti-stabbing unidirectional fabric with a surface density of 220 g / m2and 460 g / m2.

[0050] The anti-stabbing core structure is stacked in the order from the stabbing face to the skin surface as follows: 24 layers of anti-stabbing unidirectional fabric with a surface density of 225 g / m2+ 3 layers of EPE with a thickness of 5 mm, and the surface density of the aramid anti-stabbing core is 5.40 kg / m2. The anti-stabbing performance is tested, and the anti-stabbing performance test is carried out according to the standard of Public Security GA68-2019 "Police Anti-stabbing Clothing".

[0051] Comparative Example 3

[0052] The aqueous polyurethane aqueous solution is placed in a glue box, the fibers are formed into [0° / 90°] double-layer weftless cloth through dipping, spreading and laying, the fiber-to-adhesive ratio of the stab-resistant cloth is 80:20, the aramid weftless cloth weighs 1900g, after drying, the stab-resistant weftless cloth is cut into a size of 40mm x 40mm, and a stab-resistant weftless cloth with a surface density of 340g / m2 is obtained after 20min of hot pressing treatment.

[0053] The structure of the stab-resistant core piece is stacked in the order from the stab-receiving surface to the skin-facing surface: 16 layers of the stab-resistant weftless cloth with a surface density of 340g / m2 + 3 layers of 5mm-thick EPE, the surface density of the aramid stab-resistant core piece is 5.44kg / m2, and the stab-resistant performance is tested, the stab-resistant performance test is tested according to the standard of Public Security GA68-2019 "Police Stab-Resistant Clothing".

[0054] Comparative Example 4

[0055] The aqueous polyurethane aqueous solution is placed in a glue box, the fibers are formed into [0° / 90°] double-layer weftless cloth through dipping, spreading and laying, the fiber-to-adhesive ratio of the stab-resistant cloth is 85:15, the aramid weftless cloth weighs 3050g, after drying, the stab-resistant weftless cloth is cut into a size of 40mm x 40mm, and a stab-resistant weftless cloth with a surface density of 550g / m2 is obtained after 25min of hot pressing treatment.

[0056] The structure of the stab-resistant core piece is stacked in the order from the stab-receiving surface to the skin-facing surface: 10 layers of the stab-resistant weftless cloth with a surface density of 550g / m2 + 3 layers of 5mm-thick EPE, the surface density of the aramid stab-resistant core piece is 5.5kg / m2, and the stab-resistant performance is tested, the stab-resistant performance test is tested according to the standard of Public Security GA68-2019 "Police Stab-Resistant Clothing".

[0057] Table 1: Stab-resistant performance test results

[0058]

[0059]

[0060] As can be seen from the stab-resistant test results in the above table, when the surface density of the multi-level surface density structure stab-resistant core piece is less than 5.38kg / m2, effective stab resistance cannot be achieved. In addition, under the same aramid stab-resistant layer surface density conditions, the multi-level surface density structure stab-resistant core piece of the present application has more excellent stab-resistant performance compared to the single surface density stab-resistant core piece. When achieving similar stab-resistant performance, the multi-level surface density structure stab-resistant core piece of the present application has a lighter overall weight, achieving lightweight.

Claims

1. A method of making a multi-layered areal density lightweight anti-stab core panel structure, characterized by, The method comprises the following steps: S1: weaving aramid unwoven cloth with different area densities by controlling the amount of fibers and adhesive, wherein the fiber proportion of low area density aramid unwoven cloth is 75-79%, and the adhesive proportion is 25-21%; the fiber proportion of high area density aramid unwoven cloth is 80-85%, and the adhesive proportion is 15-20%; the fiber stacking direction of aramid unwoven cloth includes [0° / 90°] double-layer stacking, [0° / 90° / 0°] three-layer stacking, and [0° / 90° / 0° / 90°] four-layer stacking; S2: obtaining the anti-stab cloth by hot pressing the woven aramid unwoven cloth, wherein the low area density aramid unwoven cloth is hot pressed for 15 min to obtain low area density anti-stab unwoven cloth with an area density range of 220-240 g / m2; the high area density aramid unwoven cloth is hot pressed for 20-25 min to obtain high area density anti-stab unwoven cloth with an area density range of 340-550 g / m2; S3: stacking the anti-stab cloths with different area densities in the order of multiple layers of low area density anti-stab unwoven cloth to multiple layers of high density anti-stab unwoven cloth from the stab-receiving surface to the skin-contacting surface, and stacking the anti-stab cloths with buffer layer materials to form an anti-stab core, wherein the area density of the anti-stab core ranges from 5.38 to 5.50 kg / m2; the number of layers of low area density anti-stab unwoven cloth ranges from 14 to 17; the number of layers of high area density anti-stab unwoven cloth ranges from 3 to 5; the buffer layer structure is 2-4 layers of single-layer polyethylene foam with a thickness of 4-10 mm stacked to form a 12-18 mm thick buffer layer; if different thicknesses of single-layer are combined, the single-layer is stacked from thin to thick.

2. A multi-layer anti-stab core structure with different area densities and light weight, which is prepared by the method for preparing a multi-layer anti-stab core structure with different area densities and light weight according to claim 1.

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