KR101398748B1 - Anti-ballistic protective composite and Anti-ballistic protective helmet manufactured by using the same - Google Patents

Abstract

Disclosed is a composite material for use in a bulletproof material and a bulletproof helmet made therefrom, which is excellent in light weight and minimizes rear deformation due to impact while satisfying the level of bulletproof performance required by the industry. The bulletproof composite material of the present invention comprises: a high strength polyethylene single layer formed by stacking a plurality of high strength polyethylene fabrics; And aramid monolayers each attached to both sides of the high strength polyethylene monolayer and formed by laminating multiple layers of aramid fabrics.

Helmets, Aramid, High Strength Polyethylene, Bulletproof

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-ballistic protective composite material,

The present invention relates to a bulletproof composite material and a bulletproof helmet manufactured using the same, more specifically, to a bulletproof composite material which is excellent in bulletproof performance and light weight and can minimize rear surface deformation due to impact, The present invention relates to a bulletproof helmet.

Bulletproof composite materials that can be used for bulletproof helmets are products for protecting the body of soldiers and others from bullets and shells, and the bulletproof performance depends greatly on the materials used.

High strength polyethylene (HMPE), which has a specific gravity as low as 0.98 lower than that of water, is widely used as a bulletproof material.

However, the high-strength polyethylene has a problem that when it is subjected to a physical impact during use, the deformation may occur largely, and it may easily break due to heat. Particularly, when applied to a bulletproof helmet, there is a problem that the deformation of the inner surface layer locally in a collision with the bullet extends to the space inside the helmet, so that deformation exceeding the allowable safety clearance distance can not guarantee the lives of the soldiers. In addition, since the high-strength polyethylene does not contain a reactive group, there is a problem that it can not be painted.

Among other anti-arming composites, wholly aromatic polyamide fibers, commonly referred to as aramid fibers, include para-aramid fibers having a structure in which benzene rings are linearly connected through an amide group (-CONH) and nonmetallic aramid fibers. Para-aramid fibers have excellent properties such as high strength, high elasticity and low shrinkage, and they are widely used as bullet-proof composite materials because they have a strength of about 5 mm and a thickness of about 2 mm.

Such an aramid fiber-based composite material is generally produced by producing an aramid fabric using aramid fibers, impregnating the aramid fabric with a polymer resin to prepare a semi-hardened aramid fabric, and applying the semi-hardened aramid fabric to the mold, Followed by curing.

However, these aramid fibers have a specific gravity as high as about 1.44, which limits the use of the aramid fiber for use in a bulletproof composite material requiring excellent lightweight properties. In addition, a bulletproof composite material produced using an aramid fabric impregnated with an ordinary resin such as a phenol resin has a problem that the bulletproof performance deteriorates as the adhesion strength between the aramid fabrics decreases.

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a bulletproof composite material capable of preventing problems caused by limitations and disadvantages of the related art, and a bulletproof helmet made using the same.

An advantage of the present invention is to provide a bulletproof composite material and a bullet-proof helmet which are excellent in light weight while minimizing the level of bulletproof performance required in the industry, and can minimize rear deformation due to impact.

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. BRIEF DESCRIPTION OF THE DRAWINGS The objects and other advantages of the present invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

To achieve these and other advantages and in accordance with the purpose of the present invention, one aspect of the present invention is a high strength polyethylene single layer comprising a plurality of high strength polyethylene fabrics laminated; And an aramid single-layer laminated on both sides of the high-strength polyethylene monolayer and formed by laminating a plurality of layers of aramid fabrics.

Another aspect of the present invention provides a bulletproof helmet made using the composite material.

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.

The composite material for bulletproofing according to the present invention can combine the high-strength polyethylene fabric and the aramid fabric in an optimal form to satisfy the industry's required level of bulletproof performance, and is excellent in light weight and minimized rear-surface deformation due to impact.

Accordingly, the bullet-proof helmet made of such a bullet-proof composite material safely protects the body from the external impact, and the soldiers wearing the bullet have improved maneuverability, thereby increasing the combat power.

In addition, since aramid fabrics are used outside the bulletproof composite material, it is possible to produce composite materials having various colors.

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 and scope of the invention. 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 " semi-cured fabric " refers to a fabric impregnated with a polymeric resin in the fabric but the polymeric resin is in a state of being prepregized without being fully cured.

As used herein, the term " laminate " refers to a collection of fabrics in which the fabrics are laminated in layers and bonded by a resin.

As used herein, the term " unidirectional sheet " refers to a fabric formed by arranging filaments in one direction in parallel with each other.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a bulletproof composite material and a bulletproof helmet according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view of a bulletproof helmet 10 according to an embodiment of the present invention. 1, the bulletproof helmet 10 of the present invention comprises a high strength polyethylene single layer 12 located at the center and an inner aramid single layer 13 formed on both surfaces of the high strength polyethylene single layer 12, And an outer aramid monolayer 11 as shown in Fig. Accordingly, if the helmet and the bullet collide with each other, the outer aramid single layer 11, which is superior in heat resistance and bulletproof performance, primarily absorbs the impact of the bullet, and then the high strength polyethylene single layer 12 Prevents the linear movement of the bullet, and finally, the inner aramid single layer 13 prevents the deformation of the front surface caused by the bullet to extend to the rear surface contacting the inner space of the helmet.

That is, the outer side of the bullet-proof helmet can be painted and the aramid single layer 11 which can prevent penetration from the bullet to the utmost is disposed. In the center of the bullet-proof helmet, it is difficult to paint, but bulletproof performance is higher than that of the aramid fabric. And the aramid fleece layer 13 is disposed inside the bulletproof helmet so as to have excellent heat resistance and adhesion so that the bulging of the bullet can be effectively suppressed. desirable.

Next, a description will be made of a method for producing aramid single layer and high strength polyethylene single layer composing a bulletproof composite material usable in the bulletproof helmet 10 and the like.

First, a description will be given of a method for producing an aramid single layer forming an inner layer and an outer layer of the above-mentioned composite material for a bulletproof. The aramid monolayer is formed by laminating aramid fabrics impregnated with a plurality of resins while adhering to each other, and the aramid fabric is made of aramid fibers.

The aramid fiber can be produced by the following method.

An aromatic diamine and an aromatic diacid chloride are polymerized in a polymerization solvent to prepare an aromatic polyamide polymer, and then the radial dope containing the aromatic polyamide polymer is spun through a spinneret and solidified to produce an aramid fiber.

Meanwhile, the aramid fiber of the present invention preferably has a total fineness in the range of 500 to 4,000 denier. If the total fineness is less than 500 denier, the productivity is decreased because the density after the weaving is increased, whereas if the total fineness is more than 4,000 denier, the weaving is less feasible.

Also, the aramid fiber of the present invention preferably has a tensile strength of 20 to 28 g / d. If aramid fibers having a low tensile strength are used, it is difficult to obtain the required level of bulletproof performance in the industry, whereas when aramid fibers having excessive tensile strength are used, the bulletproof performance is not improved and only the production cost is increased .

The method for producing the aramid fabric will be described. The aramid fabric may have various shapes, but may be a woven fabric or an uni-directional sheet. In particular, aramid fabrics can be painted by a spray method, while the aramid unidirectional sheets are difficult to paint, but have better ballistic performance than aramid fabrics. Accordingly, it may be desirable to form an aramid unidirectional sheet having a color proofable aramid fabric on the outer layer of the bulletproof composite material and a bulletproofing layer on the inner layer.

The aramid fabric can be produced by applying aramid fibers prepared by the above-described method to warp and weft yarns and weaving. The aramid fabric is preferably a plain or basket tissue. Since the plain weave or the basket weave structure is formed while the warp and weft are formed with constant bending, when the external force by the bullet or the like is received, the external force is uniformly distributed throughout the fabric, and the superior bulletproof performance can be exhibited.

On the other hand, the aramid fabric preferably has a surface density of 150 to 650 g / m 2. If the area density is lower than the above range, a space may be formed in the fabric, thereby deteriorating the bulletproof performance. If the area density is higher than the above range, the fabrication of the fabric is not easy and the production efficiency may be greatly reduced.

The aramid unidirectional sheet is prepared by laminating the aramid fibers in one direction and then adhering them to each other. The aramid unidirectional sheet can exhibit a better bulletproof performance than the aramid fabric because there is no dead point where voids are formed.

Next, a method for producing the aramid single layer will be described. The aramid monolayer is prepared by preparing a semi-cured aramid fabric using the aramid fabric prepared as described above, laminating the semi-cured aramid fabric in multiple layers, and then curing.

The semi-cured aramid fabric is prepared by impregnating the aramid fabric with a polymer resin, and then continuously drying the aramid fabric using a drying chamber or the like so that the polymer resin is semi-cured.

The method of impregnating the aramid fabric with the polymer resin can be largely performed by using a dipping process or a laminating process.

Since the dipping step is performed by immersing the aramid fabric in the immersion tank containing the polymer resin solution, adjusting the resin content by using a padding roller, and then performing the drying process, the semi-cured aramid fabric Is impregnated heterogeneously with the polymer resin. As a result, the anti-bulletproof and lightweight performance of the anti-bullet composite material produced therefrom is deteriorated.

On the other hand, in the laminating process, the polymeric resin film is adhered to the aramid fabric and then dried under pressure, so that the semi-cured aramid fabric uniformly impregnated with the polymer resin can be produced, The ballistic performance and the lightweight performance are excellent.

Such a polymer resin acts as a matrix so that the external force is uniformly dispersed and the aramid fiber is protected from the external environment.

The polymer resin impregnated into the semi-cured aramid fabric is preferably 10 to 23% by weight based on the aramid fabric. If the content of the polymer resin is less than 10% by weight, the aramid fabric may be easily damaged by external friction, and the adhesive force may be lowered when the product is molded. On the other hand, when the content of the polymer resin exceeds 23% by weight, it can not be applied to a product which is required to be lightweight.

On the other hand, the polymer resin impregnated into the semi-cured aramid fabric may include a thermoplastic resin or a thermosetting resin or both, and preferably includes a phenol resin and a polyvinylbutyral (PVB) resin.

The content of the polyvinyl butyral resin is preferably 70 to 20% by weight relative to the content of the polymer resin impregnated in the semi-cured aramid fabric. If the content of the polyvinyl butyral resin is more than 70% by weight, the resultant anti-bullet performance of the resultant anti-bulletproof composite material is deteriorated. If the content of the polyvinyl butyral resin is less than 20% by weight, The anti-bullet performance of the resultant anti-bullet composite material may be deteriorated.

Next, the semi-hardened aramid fabrics are laminated in several layers and cured to produce aramid monolayer. At this time, the number of laminated sheets can be appropriately adjusted depending on the application. The curing process will be described below as it corresponds to one step of the manufacturing process of a bulletproof composite material and a bulletproof helmet to be described later.

Next, a method for producing the high strength polyethylene monolayer 12 of the present invention will be described. The high-strength polyethylene monolayer 12 is formed by laminating high-strength polyethylene fabrics including a polymer resin with a predetermined number of glues. The high-strength polyethylene fabric can be produced using the high-strength polyethylene filament after producing the high-strength polyethylene filament.

The high strength polyethylene fibers can be conventionally prepared through a gel spinning process. Such a high strength polyethylene fiber has a specific gravity as low as 0.98 and a high strength of 30 g / d.

The high strength polyethylene fabric may be a high strength polyethylene fabric or a high strength polyethylene unidirectional sheet. Particularly, the high strength polyethylene unidirectional sheet has excellent bulletproof performance.

On the other hand, it is preferable that the area density of the unidirectional high-strength polyethylene fabric made by arranging the high-strength polyethylene yarns in one direction and then adhering them is 120 to 140 g / m 2.

The high-strength polyethylene monolayer 12 is prepared by laminating high-strength polyethylene fabrics containing a polymer resin at an appropriate number of sheets according to the application and curing. The curing step corresponds to a step of manufacturing a composite material for bulletproof and a bullet proof helmet to be described later.

On the other hand, when the high-strength polyethylene fibrils are laminated together in the same direction, that is, without an angle, the high-strength polyethylene fibrillated layer 12 may preferably include a urethane coating layer.

Next, a method for manufacturing the composite material for an armor-bearing structure will be described. Such a composite material for an armor is described in more detail through a method for manufacturing the bulletproof helmet 10, which is an embodiment of the present invention.

As an example, the semi-hardened aramid fabrics produced by the above-described method are laminated as many times as necessary to the mold for making a helmet. Then, the required number of high strength polyethylene fabrics including the polymer resin prepared by the above-described method are stacked on the laminated aramid fabric. Next, a desired number of semi-cured aramid fabrics are laminated on the laminated high-strength polyethylene fabric, and then the mold is used to cure and form the bullet-proof helmet 10 at high temperature and high pressure. At this time, the temperature is preferably 120 to 160 ° C. If the temperature is too low, the adhesion of each layer is deteriorated, whereas if the temperature is too high, the physical properties of each material may be deteriorated and the bulletproof performance of the helmet may be deteriorated. On the other hand, the laminating step may be laminated before the fibers are inserted into the mold, or may be laminated on the mold.

As another example, the semi-hardened aramid fabrics are laminated to a predetermined number of the molds for manufacturing a helmet and then molded to produce a helmet-shaped outer aramid laminated material. Then, the outer aramid laminate having the helmet shape is placed on a mold for manufacturing a bulletproof helmet, and high-strength polyethylene fabrics including a predetermined number of polymer resins and a predetermined number of semi-cured aramid fabrics are laminated on the outer aramid laminate The bulletproof helmet 10 may be manufactured by curing and molding at high temperature and high pressure. On the other hand, the laminating step may be laminated before the fibers are inserted into the mold, or may be laminated on the mold.

As another example, the semi-hardened aramid fabrics may be laminated on a mold for forming a helmet by a predetermined number of sheets depending on the application, and then formed into a helmet-shaped outer aramid laminate and an inner aramid laminate. On the other hand, a high strength polyethylene fabric including the polymer resin is laminated on a mold for forming a helmet by a predetermined number of sheets, and then a helmet type high strength polyethylene laminate is manufactured. Then, the helmet-shaped outer aramid laminate, the high-strength polyethylene laminate, and the inner aramid laminate are successively placed on a mold for producing a helmet, and then the mold is used to cure and form the bullet-proof helmet 10 ) Can also be produced. At this time, the pressure is preferably set to be higher than the pressure at the time of producing the aramid laminated material. On the other hand, the laminating step may be laminated before the fibers are inserted into the mold, or may be laminated on the mold.

The bulletproof helmet 10 of the present invention can be manufactured by various methods and is not limited to the above-described manufacturing method.

In addition, a variety of anti-armor products can be manufactured using molds of other shapes in place of the molds having the shape of the bulletproof helmet 10. That is, a bulletproof plate inserted into the bulletproof vest can be manufactured using a mold having a rectangular shape, and a bulletproof composite material made of a mold having a shape of a vehicle can be used for an inner mold of a bulletproof vehicle However, the present invention is not limited thereto.

It is preferable that the content of the aramid monolayer is 10 to 80% by weight based on the total amount of the monolayer. If the content of the aramid single layer exceeds 80% by weight, the rear surface deformation can be minimized but the lightweight property can not be satisfied. On the other hand, when the content of the aramid single layer is less than 10% by weight, the lightweight property can be improved but the rear surface deformation can be increased. That is, when the bulletproof composite material is used for the bulletproof helmet 10, the soldiers wearing the bullet-proof helmet whose rear deformation exceeds the safe distance range from the inner surface layer to the head can be injured Because.

The bulletproof helmet 10 manufactured as described above has an average thickness of 9 mm or less and a total weight of 1200 g or less. If the average thickness of the bullet-proof helmet 10 exceeds 9 mm, the bulky bulky bulb may reduce the feeling of fit. Also, when the total weight of the bulletproof helmet 10 exceeds 1200 g, the soldiers wearing such a bulletproof helmet 10 may have low mobility due to the heavy feeling of the helmet.

The average speed (V50) measured according to the MIL-STD-662F specification of the bulletproof helmet 10 of the present invention manufactured by the above-described method may be 610 to 650 psi. In addition, the bulletproof helmet 10 may have a rear deformation of 40 mm or less at an average speed (V50) measured according to the MIL-STD-662F standard. At this time, the average speed is measured from a value obtained by averaging the speed at the time of full penetration and the speed at the time of partial penetration using Cal.22 caliber fragment shot (FSP).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples for production of a bulletproof helmet (10) according to an embodiment of the present invention. It should be noted, however, that the scope of the present invention should not be limited by the following examples.

Example  One

A polyparaphenylene terephthalamide polymer was prepared by polymerizing para-phenylenediamine, an aromatic diamine, and terephthaloyl dichloride, an aromatic diacid chloride, in a N-methyl-2-pyrrolidone polymerization solvent, Was dissolved in a concentrated sulfuric acid solvent to prepare a radial dope. The radial dope was radiated through a spinneret and solidified to produce a wholly aromatic aramid fiber having a tensile strength of 25 g / d and a total fineness of 3,000 denier.

The wholly aromatic aramid fibers were then applied to warps and wefts and woven in plain weave to produce aramid fabrics having a surface density of 450 g / m 2.

Next, a polyvinyl butyral resin having a content of 50% by weight and a phenol resin having a content of 50% were dissolved in a methanol solvent, and methanol was removed to obtain a polymer resin film.

Thereafter, the aramid fabric and the polymeric resin film were adhered to each other, and a pressure was applied in a chamber maintained at a temperature of 40 ° C to obtain a semi-cured aramid fabric having a polymer resin coating layer of 13 wt% relative to the aramid fabric.

On the other hand, a high-strength polyethylene unidirectional sheet made of high-strength polyethylene fibers and having a surface density of 130 g / m 2 and containing a polymer resin was prepared.

Next, the semi-cured aramid fabric, the high-strength polyethylene unidirectional sheet and the semi-cured aramid fabric were laminated in order at a predetermined number in the lower mold for producing a helmet, and then cured at a pressure of 160 bar and a temperature of 130 캜 for 20 minutes. Thus, a bullet proof helmet 10 having an average thickness of 8.5 mm and a weight of 1120 g and having an aramid single layer content of 70% by weight was produced.

Example  2

In Example 1 described above, except for using a semi-cured aramid unidirectional sheet instead of using the semi-cured aramid fabric to form the aramid monolayer 13 inside the bulletproof helmet 10, 1, a bulletproof helmet 10 was manufactured. At this time, the semi-cured aramid unidirectional sheet is made from aramid yarn, and is impregnated with 50 wt% of polyvinyl butyral resin and 50 wt% of phenol resin, and has a surface density of 235 g / m 2.

Example  3

Except that the semi-cured aramid unidirectional sheet is used instead of the semi-cured aramid fabric to form the aramid monolayer 13, 11 on the inside and outside of the bulletproof helmet 10 in the above-described first embodiment , A bullet-proof helmet 10 was produced in the same manner as in Example 1. [

Example  4 to 6

In the above-described Example 1, the components of the polymeric resin film were adjusted so that the content of the polyvinyl butyral resin in the polymer resin impregnated in the semi-cured aramid fabric was 10 wt%, 30 wt%, and 70 wt%, respectively The bullet-proof helmet 10 was produced in the same manner as in Example 1. The bullet-

Example  7 to 10

In the above-described Example 1, the number of laminated layers of the semi-hardened aramid fabric and the semi-hardened high-strength polyethylene fabric was adjusted so that the content of the aramid monolayer was 8 wt%, 30 wt%, 50 wt%, and 90 wt% The bullet-proof helmet 10 was produced in the same manner as in Example 1. The bullet-

Example  11

In Example 1 described above, except for using a phenol resin film in which a polyvinyl butyral resin is not mixed instead of using a polymer resin film in which a phenolic resin and a polyvinyl butyral resin are mixed during the production of the semi-cured aramid fabric, A bulletproof helmet 10 was produced in the same manner as in Example 1. [

Comparative Example  One

In the same manner as in Example 1 except that a semi-cured nylon 6 fabric was used to form a nylon 6 monofilament layer instead of the aramid monolayer 11 formed outside the bulletproof helmet 10 in Example 1 described above Thereby manufacturing a bulletproof helmet 10. However, the semi-cured nylon 6 fabric is a nylon 6 fabric obtained by applying a commercially available nylon 6 filament having a tensile strength of 7 g / d and a total fineness of 3,000 denier to warp and weft yarns and woven to prepare a nylon 6 fabric, Impregnated.

Comparative Example  2

In the above-described first embodiment, the entirety of the high strength polyethylene unidirectional sheet is used instead of the semi-cured aramid fabric in the manufacture of the bulletproof helmet 10, .

Comparative Example  3

In the above-described Example 1, the same procedure as in Example 1 was carried out except that a high-strength polyethylene fabric containing a polymer resin was used in the production of the bulletproof helmet 10, A helmet 10 was produced.

The bulletproof performance and the back deformation of each of the bulletproof helmets 10 manufactured by the examples and comparative examples were measured by the following methods and are shown in Table 1 below.

Average speed measurement

The average speed V50 which indirectly indicates the degree of the bulletproof performance of the bulletproof helmet 10 was measured according to the MIL-STD-662F standard, and the average speed (㎧) And the velocity at the time of complete penetration and the velocity at the time of partial penetration were averaged.

Back Deformation Measurement

The maximum diameter of the drawn portion inside the helmet was measured by the impact at an average speed (V50) measured in accordance with MIL-STD-662F and expressed as rear deformation (mm). The average speed (㎧) was obtained from the average of the speed when full penetration and the speed when passing through partial penetration using Cal.22 caliber fragment shot (FSP).

division Outside Middle Medial PVB content
(weight%) aramid content
(weight%) Average speed (㎧) Rear deformation
(Mm) Example 1 aramid-WF HMPE-UD aramid-WF 50 70 623 13 Example 2 aramid-WF HMPE-UD aramid-UD 50 70 630 16 Example 3 aramid-UD HMPE-UD aramid-UD 50 70 637 19 Example 4 aramid-WF HMPE-UD aramid-WF 10 70 619 25 Example 5 aramid-WF HMPE-UD aramid-WF 30 70 623 15 Example 6 aramid-WF HMPE-UD aramid-WF 70 70 621 13 Example 7 aramid-WF HMPE-UD aramid-WF 50 8 619 15 Example 8 aramid-WF HMPE-UD aramid-WF 50 30 618 14 Example 9 aramid-WF HMPE-UD aramid-WF 50 50 617 14 Example 10 aramid-WF HMPE-UD aramid-WF 50 90 611 12 Example 11 aramid-WF HMPE-UD aramid-WF 0 70 610 12 Comparative Example 1 nylon6-WF HMPE-UD aramid-WF 50 70 589 45 Comparative Example 2 HMPE-UD HMPE-UD HMPE-UD 50 70 635 41 Comparative Example 3 aramid-WF aramid-WF aramid-WF 50 70 609 13

The aramid-WF in Table 1 refers to an aramid fabric, the aramid-UD refers to an aramid unidirectional sheet, and the HMPE-UD refers to a high strength polyethylene unidirectional sheet.

From the results shown in Table 1, it can be seen that the average speed and the rear surface deformation of the bulletproof helmet 10 manufactured using the general nylon 6 fabric on the outer layer are very low, and the bulletproof helmet (manufactured by using only the high strength polyethylene fabric 10) shows that the average speed is high but the backside deformation is large. In the case of using only the aramid fabric, the backing deformation is small, but the average speed is greatly decreased.

From the results shown in Table 1, it can be seen that the bulletproof helmet 10 manufactured using the aramid unidirectional sheet is superior in the average speed than the aramid fabric. However, when an aramid unidirectional sheet is used for the outer layer, coloring becomes difficult.

1 is a schematic view of a bulletproof helmet according to an embodiment of the present invention.

Description of the Related Art [0002]

10: Bulletproof Helmet

11: outer aramid single layer

12: High Strength Polyethylene Single Layer

13: inner aramid original layer

Claims (13)

A high strength polyethylene single layer formed by laminating multiple layers of high strength polyethylene fabrics; And And an outer aramid monolayer and an inner aramid monolayer adhered to both sides of the high strength polyethylene monolayer, wherein the aramid monolayer is formed by stacking a plurality of layers of aramid fabrics, Wherein the outer aramid monolayer comprises an aramid fabric, Wherein the inner aramid monolayer comprises an aramid unidirectional sheet. The method according to claim 1, Wherein the outer aramid monolayer further comprises a phenolic resin and a polyvinyl butyral resin impregnated in the aramid fabric, Wherein the aramid unidirectional sheet comprises a plurality of aramid fibers aligned in one direction and bonded to each other. 3. The method of claim 2, Wherein the content of the polyvinyl butyral resin is 70 to 20% by weight relative to the content of the polymer resin impregnated in the aramid fabric. The method according to claim 1, Wherein the high strength polyethylene fabric comprises a high strength polyethylene uni-directional sheet. 5. The method of claim 4, Wherein the high strength polyethylene unidirectional sheet has a surface density of 120 to 140 g / m < 2 >. delete The method according to claim 1, Wherein the aramid fabric has a surface density of 150 to 650 g / m < 2 >. delete The method according to claim 1, Wherein the content of the outer and inner aramid single layers in the bulletproof composite material is 10 to 80% by weight. A bullet-proof helmet produced by using the composite material for a bulletproof according to any one of claims 1 to 5, 7, and 9. 11. The method of claim 10, Wherein the helmet has an average thickness of less than or equal to 9 mm and a total weight of less than or equal to 1200 grams. 11. The method of claim 10, The average speed (V50) measured according to the MIL-STD-662F standard was 610 to 650 kPa, and the average speed was the speed at which the bullet-proof helmet was fully penetrated using Cal.22 caliber fragment shot (FSP) And a value obtained by averaging the speed at the time of partially penetrating the helmet. 11. The method of claim 10, Wherein the bulletproof helmet has a rear deformation of 40 mm or less at an average speed (V50) measured in accordance with MIL-STD-662F.

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