KR101589786B1 - Bulletproof Material - Google Patents

Abstract

Disclosed is a bulletproof material capable of improving the bulletproof performance against debris, improving the sustainability of the bulletproof performance, and reducing the rear deformation even though it is relatively light. The inventive bulletproof material comprises fabrics formed of high strength fibers and a felt fabric, the felt fabric comprising irregularly arranged short fibers and a water repellent layer on the short fibers.

Description

Bulletproof material {Bulletproof Material}

The present invention relates to a bulletproof material, and more particularly, to a bulletproof material capable of improving the bulletproof performance against debris, improving the sustainability of the bulletproof performance, and reducing the back deformation even though it is relatively light.

Bulletproof products are products for protecting the human body from bullets and shells, and are required to have excellent bulletproof performance and light weight. However, in order to improve the bulletproof performance, it is general that the light weight of the bulletproof product is sacrificed to some extent. Conversely, weight reduction of bulletproof products generally causes a decrease in bulletproof performance.

It is known to use unidirectional fabrics for lightening bulletproof products and improving bulletproof performance.

Meanwhile, US Patent Publication No. US2011 / 0219943 proposes a composite fabric including both high-strength fiber fabrics and unidirectional fabrics of high-strength fibers in order to improve the bulletproof performance. The publication teaches that it is preferred that the fabric of the composite fabric is not coated with a matrix resin, and that when coated, it is preferably coated with a matrix resin having the same or similar chemical structure as the unidirectional matrix resin (See paragraph [0054]), a bulletproof article including both a fabric and a unidirectional fabric may have better bulletproof performance than a bulletproof article including only unidirectional fabrics, as well as further reduce the rearward deformation due to a bullet impact (See paragraph [0054]).

Although the composite fabric proposed by the above publication exhibits excellent anti-bullet property, it is still in the aspects of lightening of the bulletproof article, bulletproof performance against debris, persistence of bulletproof performance, and anti-trauma There is room for improvement.

Accordingly, the present invention relates to a bulletproof material capable of preventing problems caused by limitations and disadvantages of the related art.

One aspect of the present invention is to provide a bulletproof material capable of improving the bulletproof performance against debris, improving the sustainability of the bulletproof performance, and reducing the rear deformation even though the bullet is relatively lightweight.

Other features and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description. Alternatively, other features and advantages of the present invention may be understood through practice of the present invention. Objects and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims of this invention.

To achieve these and other objects and in accordance with the purpose of the present invention, there is provided a bulletproof material having a front surface and a rear surface opposite to a bullet to be collided, the woven fabric comprising: a plurality of woven fabrics positioned on the front side; And at least one felt fabric located on the back side of the fabric, the fabrics being formed of a first high strength fiber having a tensile modulus of at least 11 g / denier and a tensile modulus of at least 200 g / denier, Staple fibers having a strength of at least 11 g / denier, a tensile modulus of at least 200 g / denier, and a fineness of 1.5 to 5 denier; And a water repelling layer on the short fibers, wherein the water repellent layer is formed by applying a water repellent agent containing fluorocarbon to the short fibers.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are intended to provide further explanation of the invention as claimed.

Although the bulletproof material of the present invention is relatively lightweight, not only the rear surface deformation due to the bullet impact is significantly reduced, but also exhibits excellent bulletproof performance against debris and excellent bulletproof performance can be maintained for a long time.

Other advantages of the present invention will be described in detail below with the related technical constitution.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 is a cross-sectional view of a bulletproof material according to an embodiment of the present invention,
2 is a cross-sectional view of a bulletproof material according to another embodiment of the present invention,
3 is a sectional view of a bulletproof material according to another embodiment of the present invention.

Hereinafter, embodiments of the bulletproof material of the present invention will be described in detail with reference to the accompanying drawings.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. It will be apparent to those skilled in the art that variations are possible. Therefore, the present invention encompasses all changes and modifications that come within the scope of the invention as defined in the appended claims and equivalents thereof.

As used herein, the term " high strength fiber " means a fiber having a tenacity of at least 11 g / denier and a tensile modulus of at least 200 g / denier.

1 is a cross-sectional view of a bulletproof material according to an embodiment of the present invention.

As illustrated in FIG. 1, the bulletproof material 100 according to an embodiment of the present invention has a front surface FS on which a bullet collides and a rear surface BS opposite to the bullet. The bulletproof material 100 includes a plurality of fabrics 110 located on the front side FS and at least one felt fabric 120 located on the back side BS side.

The bulletproof material 100 includes an appropriate number of fabrics 110 and felt fabrics 120 so as to have a surface density meeting the lightening requirement of the bodyshell, for example, a surface density of 3 to 6.8 kg / m ² . According to one embodiment of the present invention, the bulletproof material 100 includes 10 to 30 plies of fabrics 110 and 1 or 2 sheets of felt fabrics 120. The fabrics 110 and the felt fabric (s) 120 are joined together by, for example, diamond stitching.

The fabrics 110 located on the front side FS are formed of a first high strength fiber having a tensile modulus of at least 11 g / denier and a tensile modulus of at least 200 g / denier.

The first high strength fiber may be an ultra high molecular weight polyethylene (UHMWPE) fiber or an aramid fiber, and each of the fabrics 110 has a surface density of 150 to 500 g / m ² . If the area density is less than 150 g / m < ² >, gaps may exist in the fabrics 111 and 112, resulting in deterioration of the bulletproof performance. On the other hand, weaving the area density exceeding 500 g / m ² causes a decrease in production efficiency.

The felt fabric 120 located on the rear side BS side is composed of staple fibers irregularly arranged in a state of being entangled with each other by needle punching or water jet and water repelling layer ). Since the bulletproof material 100 of the present invention includes the felt fabric 120 on the back side (BS) side, the bulletproof material having only the fabrics as well as the bulletproof material including both the fabric and the unidirectional fabric And rear deformation properties.

The felt fabric 120 has a surface density of 100 to 600 g / m < ^{2 &} gt ;. If the area density is less than 100 g / m < ² >, gaps may exist in the felt fabric 120, which may result in deterioration of the bulletproof performance. On the other hand, when the felt fabric 120 is manufactured such that the area density exceeds 600 g / m ² , the weight of the bulletproof material may be reduced, or the bulletproof performance may be lowered (the number of fabrics may be reduced to suitably set the area density of the bullet- Lt; / RTI >

The short fibers of the felt fabric 120 may be ultra-high molecular weight polyethylene short fibers or aramid short fibers having a length of 38 to 51 mm and a fineness of 1.5 to 5 denier.

Ultrahigh molecular weight polyethylene short fibers and aramid short fibers are susceptible to moisture, so that their bulletproof performance may deteriorate over time. In order to solve such problems, a water-repellent layer is formed on the short fibers of the felt fabric 120 of the present invention. The water repellent layer of the felt fabric 120 is formed by applying a water repellent agent containing fluorocarbon to the short fibers. The fluorocarbon serves to impart water repellency to the felt fabric 120. As the fluorocarbon, hydroxylated perfluoroalkylethyl acrylate copolymer may be used.

On the other hand, in a harsh environment or after long term use, the water repellent component such as fluorocarbon is removed from the staple fibers of the felt fabric 120, resulting in a drop in the physical properties of the staple fibers due to moisture and a drastic drop in the bulletproof performance . Therefore, in order to strengthen the bond between the short fiber and the fluorocarbon, the water repellent agent used for forming the water repellent layer of the present invention may contain, in addition to the fluorocarbon, a crosslinking agent such as an isocyanate compound such as toluene diisocyanate or methylene diphenyl diisocyanate As shown in FIG.

The front face FS of the bulletproof material 100 is locally deformed when the bulletproof material 100 is physically impacted by the bullet on the front face FS of the bulletproof material 100, Backside (BS), and rear deformation exceeding the allowable safe separation distance may occur. Serious backside deformation of the bulletproof material 100 may cause fatal damage to the wearer. Accordingly, in order to suppress the rear surface deformation of the bulletproof material 100, the water repellent agent used for forming the water repellent layer of the present invention may further include a hardness-enhancing resin such as polyvinyl acetate.

Alternatively, the water repellent agent used in the water repellent layer formation of the present invention may further include an antifoaming agent (for example, dipropylene glycol) and an emulsion stabilizer (for example, malic acid) for bubbling. In this case, the water repellent agent may comprise 0.5 to 10 wt% of fluorocarbon, 0.5 to 10 wt% of hardness-reinforced resin, 0.5 to 5 wt% of a crosslinking agent, 0.1 to 2 wt% of defoamer, 0.1 to 2 wt% of emulsion Stabilizer, and 73 to 98.3 wt% water.

When the content of fluorocarbon is less than 0.5% by weight, the desired water repellency is difficult to expect. When the content exceeds 10% by weight, the water repellency is not increased, and the flexibility of the bulletproof material 100 may be lowered.

When the content of the hardness-reinforced resin is less than 0.5% by weight, improvement in the rear surface deformation properties of the bulletproof material 100 hardly occurs, and when the content thereof exceeds 10% by weight, the flexibility of the bulletproof material 100 is decreased, The feeling of wearing of the body armor greatly deteriorates.

When the content of the cross-linking agent is less than 0.5% by weight, it is difficult to maintain the desired water repellency. When the content of the cross-linking agent is more than 5% by weight, the effect is not exerted.

According to one embodiment of the present invention, a water repellent agent having the above composition is also applied on the fabrics 110 of the present invention, thereby forming a water repellent layer.

Methods such as padding, coating, dipping, spraying, brushing, or film-coating may be used as a method for applying the water repellent agent on the first high strength fibers of the fabrics 110 and the short fibers of the felt fabric 120 . After the water repellent agent is applied on the first high strength fibers and / or the short fibers, the heat treatment process may be performed at 120 to 200 DEG C for 15 to 150 seconds.

Hereinafter, a bulletproof material according to another embodiment of the present invention will be described with reference to FIG. 2 is a sectional view of a bulletproof material according to another embodiment of the present invention.

2, the bulletproof material 200 according to another embodiment of the present invention includes a plurality of fabrics 210 located on the front side FS, at least one felt fabric 210 located on the rear side (BS) (230), and at least one unidirectional fabric (220) between the fabrics (210) and the felt fabric (230).

Bullet-proof material 200, surface density, for example in order to have a surface density of 3 to 6.8 kg / m ^2, textile 210, the unidirectional fabric 220, and a felt fabric satisfying the lightweight requirements of the body armor ( ) 230 in the appropriate number of combinations. The fabrics 210, unidirectional fabrics 220, and felt fabric (s) 230 are joined together by, for example, diamond stitching.

The fabrics 210 located on the front side FS and the felt fabric 230 located on the rear side BS have been described in detail above, and a detailed description thereof will be omitted.

The unidirectional fabric 220 between the fabrics 210 and the felt fabric (s) 230 includes first and second fibrous layers 221, 222 adjacent to each other. Each of the first and second fibrous layers 221 and 222 includes second high strength fibers having a tensile modulus of at least 11 g / denier and a tensile modulus of at least 200 g / denier. The second high strength fibers may be ultra high density polyethylene fibers or aramid fibers.

Within each fiber layer 221, 222, the second high strength fibers are unidirectionally oriented in a substantially equilibrium manner. The arrangement of the second high-strength fibers can be maintained by coating the second high-strength fibers of the first and second fiber layers 221 and 222 with a composition comprising a polyurethane resin. The composition may be sprayed onto the second high strength fibers via a spray method or may be applied to the second high strength fibers in the form of a film.

The second high-strength fibers of the first fiber layer 221 are arranged in different directions from the second high-strength fibers of the second fiber layer 222. For example, the first and second fibrous layers 221 and 222 may be cross-bonded so that the second high-strength fibers of the first and second fibrous layers 221 and 222 adjacent to each other form an angle of about 90 degrees. have.

Cross-joining of the first and second fibrous layers 221 and 222 may be performed through various methods. For example, the composition impregnated or coated on the first and second fibrous layers 221 and 222 may function as a bonding agent. Optionally, the first and second fibrous layers 221 and 222 can be cross-bonded via an adhesive, plastic film, or other suitable means. Such cross-junctions may be performed through a continuous cross-plying method.

Alternatively, the unidirectional fabric 220 may further comprise third and fourth fibrous layers (not shown). Each of the third and fourth fibrous layers includes an ultra-high density polyethylene fiber or an aramid fiber arranged in one direction. In this case, the first to fourth fibrous layers may be cross-bonded so that the rotation angle of their high-strength fibers is 0 占 90 占 0 占 90 占.

The first high strength fiber constituting the fabrics 210 is aramid fiber and the second high strength fiber constituting the first and second fibrous layers 221 and 222 of the unidirectional fabric 220 is an ultra high molecular weight polyethylene fiber And the staple fibers constituting the felt fabric 230 may be aramid staple fibers.

Each of the fabrics 210 has a surface density of 150 to 500 g / m ² , the unidirectional fabric 220 has a surface density of 100 to 400 g / m ² , and the felt fabric 230 has a surface density of 100 to 600 g / g / m < ² >, and the entire bulletproof material 200 has a surface density of 3 to 6.8 kg / m < ^{2 &} gt ;.

The bulletproof material 200 of the present embodiment has a structure in which a part of the fabrics 110 of the bulletproof material 100 of the previous embodiment is made of a unidirectional fabric 220, specifically, a unidirectional fabric 220 composed of ultra high molecular weight polyethylene fibers It is more advantageous in terms of bulletproof performance and light weight. That is, since both the fabric 210 formed of the first high-strength fiber and the unidirectional fabric 220 formed of the second high-strength fiber are included, the interaction between the fabric 210 and the unidirectional fabric 220 A synergistic effect can be generated.

Hereinafter, a bulletproof material according to another embodiment of the present invention will be described with reference to FIG.

3, the bulletproof material 300 according to another embodiment of the present invention includes a plurality of fabrics 310 located on the front side FS, at least one felt fabric 310 located on the rear side (BS) And at least one unidirectional fabric 320 between the fabrics 310 and the felt fabric 330. The protuberance material 300 is similar to the protuberant fabric 200 illustrated in FIG.

The unidirectional fabric 320 of the bulletproof material 300 of FIG. 3 includes two polymer films 323 and the first and second fibrous layers 321 and 322 between the polymer films 323, Is different from the unidirectional fabric 220 of Fig. 2, which does not have a polymer film.

The polymer films 323 may be formed of a polyolefin resin. The polymeric films 323 may be formed by bonding between the unidirectional fabrics 320, bonding between the unidirectional fabric 320 and the fabric 310 and bonding between the unidirectional fabric 320 and the felt fabric 330 It may also function as an adhesive for bonding.

The bulletproof materials (100, 200, 300) of the present invention as described above have a bulletproof performance (V ₅₀ ) of 670 m / s or more and a back deformation characteristic of 40 mm or less against debris. The bulletproof performance (V ₅₀ ) for the fragment is a value measured by the test method prescribed in MIL-STD-662F using the fragment simulated projectiles (FSP) specified in MIL-P-46593A, The deformation characteristics are 44 MAG, which is applied to NIJ0101.06 Version Level IIIA. It is a value measured using a bullet.

In addition, according to the present invention, excellent anti-bullet performance and rear surface deformation characteristics of the bulletproof materials (100, 200, 300) can be maintained for a long time under harsh environments.

Hereinafter, the present invention will be described in detail with reference to examples and comparative examples. It should be noted, however, that the scope of the present invention should not be limited by the following examples.

≪ Preparation of aramid fabric &

Manufacturing example  One

Aramid fiber having a fineness of 840 denier (Kolon Industries Inc., Hercules Crohn ^® HF 100) was prepared in a plain weave aramid fabric by performing, using a warp and weft. The warp density and weft density of the aramid fabric were 105 bands / cm, respectively. The fabric was treated with a scouring agent containing Na ₂ CO ₃ at about 60 ° C, washed with water and dried.

Then, the refined fabric was dipped in a water repellent agent. Wherein the water repellent agent comprises 3% by weight of a hydroxylated perfluoroalkyl ethyl acrylate copolymer, 3% by weight of polyvinyl acetate, 3% by weight of toluene diisocyanate, 0.3% by weight of dipropylene glycol, 0.3% , And 90.4 wt% water. The aramid fabric was finished by heat treating the fabric impregnated with the water repellent agent at about 160 DEG C for 60 seconds. The aramid fabric had a surface density of 205 g / m < 2 >.

≪ Preparation of Aramid Felt Fabric >

Manufacturing example  2

Aramid felt fabrics were prepared by entangling aramid short fibers (Heracron ^占 HS625, Kolon Industries, Inc.) having a fineness of 2.25 deniers and a length of 51 mm through needle punching. The aramid felt fabric had a surface density of 450 g / m < 2 >. The felt fabric was treated with a scouring agent containing Na ₂ CO ₃ at about 60 ° C, washed with water and dried.

Then, the felt fabric subjected to refining treatment was immersed in a water repellent agent. Wherein the water repellent agent comprises 3% by weight of a hydroxylated perfluoroalkyl ethyl acrylate copolymer, 3% by weight of polyvinyl acetate, 3% by weight of toluene diisocyanate, 0.3% by weight of dipropylene glycol, 0.3% , And 90.4 wt% water. The felt fabric impregnated with the water repellent agent was thermally treated at about 160 캜 for 60 seconds to complete the aramid felt fabric. The aramid felt fabric had a surface density of 460 g / m < 2 >.

Manufacturing example  3

An aramid felt fabric having a surface density of 450 g / m < 2 > was prepared in the same manner as in Preparation Example 2, except that polyvinyl acetate was not contained in the water repellent agent and the content of water in the water repellent agent component was 93.4 wt%.

Manufacturing example  4

An aramid felt fabric having a surface density of about 460 g / m < 2 > was prepared in the same manner as in Preparation Example 2, except that toluene diisocyanate was not included in the water repellent agent and the water content in the water repellent agent component was 93.4 wt%.

Manufacturing example  5

An aramid felt fabric having a surface density of about 450 g / m < 2 > was prepared in the same manner as in Preparation Example 2, except that polyvinyl acetate and toluene diisocyanate were not included in the water repellent agent and the content of water in the water repellent agent component was 96.4% .

Manufacturing example  6

An aramid felt fabric having a surface density of about 450 g / m < 2 > was prepared in the same manner as in Preparation Example 2, except that the refining treatment and the water repellent treatment were not performed.

≪ Preparation of ultra high molecular weight polyethylene unidirectional fabric &

Manufacturing example  7

A bundle of ultrahigh molecular weight polyethylene fibers (DSM, Dyneema ^® ) having a fineness of 1,500 denier is aligned substantially in one direction on a common plane, and then an adhesive is applied by spraying to form the first and second fiber layers, respectively Respectively. Subsequently, the first and second fibrous layers were cross-bonded at an angle of about 90 to complete an ultrahigh molecular weight polyethylene unidirectional fabric. The ultrahigh molecular weight polyethylene unidirectional fabric had a surface density of 140 g / m < 2 >.

≪ Examples &

Example  One

Twenty-eight aramid fabrics prepared in Preparation Example 1 and one aramid felt fabric prepared in Production Example 2 were sequentially laminated and bonded together by a diamond stitching method, thereby completing a bulletproof material. The overall density of the bulletproof material was 6.20 kg / m 2.

Example  2

Twenty-eight aramid fabrics prepared in Preparation Example 1 and one aramid felt fabric prepared in Production Example 3 were successively laminated and joined together by a diamond stitching method to complete the bullet-proof material. The overall density of the bulletproof material was 6.19 kg / m 2.

Example  3

Twenty-eight aramid fabrics prepared in Preparation Example 1 and one aramid felt fabric prepared in Production Example 4 were successively laminated and joined together by a diamond stitching method to complete the bullet-proof material. The overall density of the bulletproof material was 6.20 kg / m 2.

Example  4

Twenty-eight aramid fabrics prepared in Preparation Example 1 and one aramid felt fabric prepared in Production Example 5 were successively laminated and joined together by a diamond stitching method, thereby completing a bulletproof material. The overall density of the bulletproof material was 6.19 kg / m 2.

Example  5

14 aramid fabrics prepared in Preparation Example 1, 14 sheets of ultra-high molecular weight ethylene unidirectional fabric prepared in Production Example 7, and 1 aramid felt fabric prepared in Production Example 2 were sequentially laminated and then subjected to diamond stitching To form a bulletproof material. The overall density of the bulletproof material was 5.29 kg / m 2.

<Comparative Example>

Comparative Example  One

Only 32 pieces of the aramid fabrics manufactured through Production Example 1 were laminated and joined together by a diamond stitching method to complete the bulletproof material. The overall density of the bulletproof material was 6.56 kg / m 2.

Comparative Example  2

Only 36 pieces of ultrahigh molecular weight ethylene unidirectional fabrics prepared in Production Example 7 were laminated and joined together by a diamond stitching method to complete a bulletproof material. The overall density of the bulletproof material was 5.04 kg / m 2.

Comparative Example  3

Fifteen aramid fabrics prepared in Production Example 1 and 15 high molecular weight ethylene unidirectional raw fabrics prepared through Production Example 7 were sequentially laminated and bonded together by diamond stitching to complete the bulletproof material. The overall density of the bulletproof material was 5.18 kg / m 2.

Comparative Example  4

14 aramid fabrics prepared in Preparation Example 1, 14 sheets of ultra high molecular weight ethylene unidirectional fabrics prepared in Production Example 7 and one aramid felt fabric prepared in Production Example 6 were sequentially laminated, Stitching method to form a bulletproof material. The overall density of the bulletproof material was 5.28 kg / m 2.

The bulletproof performance, the rear deformation characteristics, the initial water repellency, the water repellency after rubbing, and the durability of each of the bulletproof materials manufactured by the above embodiments and comparative examples were measured by the following methods, Table 1 shows the results.

Bulletproof performance ( V ₅₀ )

The average velocity (V ₅₀ ) (㎧) that indirectly indicates the degree of bulletproof performance of the specimen (400 mm x 400 mm) of the bulletproof material is determined by the simulated fragmented projectiles (FSP, .22 cal) specified in MIL-P-46593A ) Was measured by the test method specified in MIL-STD-662F.

Immersion  Backside Deformation Measurement

The specimen (400mm × 400mm) was immersed in water for 30 minutes, then removed, and the NIJ0101.06 version Level IIIA.44 MAG. The depth (mm) of the protruding part of the bulletproof material rear side was measured by impact at an average speed (V ₀ ) with a 240 gauge SJHP.

Average speed
(V ₅₀ ) (m / s) Rear deformation after immersion
(mm) Example 1 685 32 Example 2 675 36 Example 3 678 34 Example 4 670 38 Example 5 675 35 Comparative Example 1 660 43 Comparative Example 2 630 46 Comparative Example 3 650 41 Comparative Example 4 670 40

100, 200, 300: bulletproof material 110, 210, 310: fabric
120, 230, 330: felt fabric 220, 320: unidirectional fabric
221, 321: first fiber layer 222, 322: second fiber layer
323: polymer film

Claims (12)

A bulletproof material having a front surface on which bullets will collide and a rear surface opposite thereto,
A plurality of woven fabrics located on the front side;
At least one felt fabric located on the rear side; And
At least one unidirectional fabric between the fabrics and the felt fabric,
The fabrics are formed of a first high strength fiber having a tensile modulus of at least 11 g / denier and a tensile modulus of at least 200 g / denier,
Said felt fabric comprising:
Staple fibers having a fineness of 1.5 to 5 denier; And
A water repelling layer on the short fibers,
Wherein the water repellent layer is formed by applying a water repellent agent containing fluorocarbon to the short fibers. delete The method according to claim 1,
Wherein the unidirectional fabric comprises first and second fibrous layers adjacent to each other,
Wherein each of said first and second fiber layers comprises unidirectionally oriented second high strength fibers having a tensile modulus of at least 11 g / denier and a tensile modulus of at least 200 g / denier,
And the second high strength fibers of the first fiber layer are arranged in different directions from the second high strength fibers of the second fiber layer. The method of claim 3,
Wherein the unidirectional fabric further comprises two polymer films,
Wherein the first and second fibrous layers are disposed between the two polymer films. 5. The method of claim 4,
Wherein the polymer films are formed of a polyolefin resin. The method of claim 3,
Wherein the first high strength fiber is an aramid fiber,
Wherein the second high strength fiber is an ultra high molecular weight polyethylene fiber,
Wherein the staple fibers are aramid staple fibers. The method according to claim 1,
Each of the fabrics has a surface density of 150 to 500 g / m &lt; ² &gt;
The unidirectional fabric has a surface density of 100 to 400 g / m &lt; ² &gt;
The felt fabric has a surface density of 100 to 600 g / m &lt; ² &
Wherein the bulletproof material has a surface density of 3 to 6.8 kg / m &lt; ² &gt;. The method according to claim 1,
Wherein the first high strength fiber is an aramid fiber,
Wherein the staple fibers are aramid staple fibers. The method according to claim 1,
Each of the fabrics has a surface density of 150 to 500 g / m &lt; ² &gt;
The felt fabric has a surface density of 100 to 600 g / m &lt; ² &
Wherein the bulletproof material has a surface density of 3 to 6.8 kg / m &lt; ² &gt;. The method according to claim 1,
Wherein the water repellent agent further comprises a crosslinking agent and a hardness-enhancing resin,
The crosslinking agent is an isocyanate compound,
Wherein the hardness-reinforcing resin is polyvinyl acetate. 11. The method of claim 10,
Wherein the fluorocarbon is a hydroxylated perfluoroalkylethyl acrylate copolymer,
Wherein the crosslinking agent is toluene diisocyanate or methylene diphenyl diisocyanate. 11. The method of claim 10,
Wherein the water repellent agent comprises from 0.5 to 10% by weight of fluorocarbon, from 0.5 to 10% by weight of hardness-reinforced resin, from 0.5 to 5% by weight of crosslinking agent, from 0.1 to 2% by weight of defoamer, from 0.1 to 2% 73 to 98.3% by weight of water.

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