KR101587050B1 - Bullet-proof helmet and method for manufacturing the same - Google Patents

Abstract

The bulletproof helmet according to the present invention comprises a polyurethane foam (A) forming an inner layer of a bulletproof helmet and (ii) a high strength fiber fabric prepreg (10) coated with a resin on a high strength fiber fabric are laminated, cured And the layered product (B) is formed integrally with the polyurethane foam (A) to form an intermediate layer and an outer layer of the bulletproof helmet.
The inner layer of the bulletproof helmet is formed of the polyurethane foam (A) in place of one sheet of the high-strength fiber fabric prepreg (10), so that even when the bulletproof helmet is increased in weight or the bulletproof performance is not deteriorated, .

Description

Bullet-proof helmet and method for manufacturing same

The present invention relates to a bulletproof helmet and a method of manufacturing the bulletproof helmet, and more particularly, to a bulletproof helmet in which the lightweight property is kept as it is but the rear surface deformation is greatly reduced at the time of adhering.

Bulletproof helmets are used to protect the human head from bullets and shell fragments.

BACKGROUND ART Conventionally, as a bulletproof helmet, a product obtained by laminating and curing a plurality of high-density polyethylene prepregs impregnated or coated with high density polyethylene resin has been used.

However, since the high density polyethylene has a specific gravity lower than that of water, it is preferable to reduce the weight of the bulletproof helmet. However, when subjected to a physical impact, deformation may occur largely and heat is weak.

As another conventional bulletproof helmet, a product obtained by alternately laminating and curing an aramid fabric prepreg impregnated or coated with a high-density polyethylene prepreg and an aramid fabric, as described in Korean Patent No. 10-0936056, has been used .

As another conventional bulletproof helmet, a product obtained by laminating and curing the aramid fabric prepreg has been used.

However, the conventional bulletproof helmets have a problem in that the rear deformation is generated at a level of 40 mm at the time of landing.

If the number of prepreg laminates is increased in order to reinforce the rear surface deformation of the conventional bulletproof helmets, the rear surface deformation can be reduced when the bulletproof helmet is thrust, but the weight of the bulletproof helmet increases.

SUMMARY OF THE INVENTION The present invention provides a bulletproof helmet capable of drastically reducing the rear surface deformation at the time of landing without increasing the weight of the bulletproof helmet.

In order to achieve such a problem, in the present invention, when a bullet-proof helmet is produced by laminating and curing high-strength fiber fabric prepregs 10, a polyurethane foam (A) is used instead of one high-strength fiber fabric prepreg (10) One piece is used to form the inner layer of the bulletproof helmet.

The inner layer of the bulletproof helmet is formed of the polyurethane foam (A) in place of one sheet of the high-strength fiber fabric prepreg (10), so that even when the bulletproof helmet is increased in weight or the bulletproof performance is not deteriorated, .

1 is a schematic cross-sectional view of a bulletproof helmet according to the present invention;

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

First, the bulletproof helmet according to the present invention comprises a polyurethane foam (A) forming an inner layer of a bulletproof helmet and (ii) a high strength fiber fabric prepreg The legs 10 comprise a laminated and cured laminate B which is integrally molded with the polyurethane foam A to form an intermediate layer and an outer layer of the bulletproof helmet.

1 is a schematic cross-sectional view of a bulletproof helmet according to the present invention.

1, the innermost layer of the bulletproof helmet is formed of a polyurethane foam (A), and the remaining middle and outer layers of the bulletproof helmet are formed of high strength fiber fabric prepregs 10 , And the high-strength fiber fabric prepregs 10 are laminated to each other to form a layered product (B).

As the polyurethane foam, neoprene (trade name) may be used.

The number of laminated and cured high-strength fiber fabric prepregs 10 in the laminate (B), that is, the number of laminated layers is preferably 14 to 20, is preferable for obtaining both lightness and elasticity.

The resin is a thermosetting resin or a thermoplastic resin.

The high strength textile fabrics include aramid fiber fabrics, carbon fiber fabrics, high density polyethylene fiber fabrics, hybrid fabrics of aramid fibers and carbon fibers, hybrid fabrics of aramid and high density polyethylene fibers, and hybrid fabrics of carbon fibers and high density polyethylene fibers to be.

An example of an embodiment of producing the high-strength fiber fabric is as follows. A high-strength fiber is fabricated by applying a high-strength fiber to a warp yarn to produce a warp beam, then installing the warp beam on a weaving machine, and applying high- At this time, the aramid fabric is preferably a plain weave or a basket weave fabric. Since the plain weave or the basket weave structure is formed by forming warp and weft with constant curvature, when an external force such as bullet is received, the external force is uniformly distributed throughout the fabric, thereby providing excellent bulletproof performance.

Also, the high strength fiber fabric preferably has a density of 150 to 520 g / m < 2 >. If the density is too low, a space may be formed in the fabric, which may result in deterioration of the bulletproof performance. If the density is too high, the fabrication of the fabric is not easy and the production efficiency may be greatly reduced.

The high-strength fiber preferably has a total fineness in the range of 600 to 3,000 denier. If the total fineness is less than 500 denier, the productivity may be lowered since the density after the weaving is increased, whereas if the total fineness exceeds 4,000 denier, the weaving performance may be lowered.

It is preferable that the high-strength fiber has a tensile strength of 20 g / d or more. If aramid fibers having a low tensile strength are used, it is difficult to obtain a bulletproof performance as required in the industry.

Since the inner layer of the bulletproof helmet is formed by using the polyurethane foam (A) in place of one piece of the high strength fiber fabric prepreg 10, the bulletproof helmet according to the present invention can be used for rearward change .

The total weight of the bulletproof helmet according to the present invention is less than 1,400 g, and the NIJ LEVEL IIA. 9mm The back deformation of FMJ carbon is within 20㎜.

Next, a method of manufacturing the bulletproof helmet according to the present invention will be described.

First, a first step of laminating the polyurethane foam (A) in a bulletproof helmet mold is carried out, and then the polyurethane foam (A) laminated in the bulletproof helmet mold is subjected to a first step (A) laminated in a metal mold for a bulletproof helmet, and a high-strength fiber fabric prepreg (10) laminated in a metal mold for a bulletproof helmet by the above-described first and second steps, A third step of heating and pressing the fabric prepregs 10 to cure them integrally is carried out to produce a bullet proof helmet.

In the second step, the number of laminated layers of the high-strength fiber fabric prepreg 10 is preferably 14 to 20, which is preferable for reducing the rear deformation while maintaining the light weight and the elasticity of the bulletproof helmet.

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.

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 then solidified to produce a 3,000 denier wholly aromatic aramid fiber.

The aramid fibers were then applied to warp and weft yarns, respectively, and woven into plain weave to produce an aramid fabric having a density of 450 g / m < 2 >.

Next, the aramid fabric prepreg 10 was prepared by coating the aramid fabric prepared above with 13 wt% of a mixed resin containing 65 wt% of phenol resin and 35 wt% of polybutyral resin, compared to the aramid fabric.

Next, one layer of a polyurethane foam (trade name: neoprene) was laminated in a mold for helmet molding, and then 16 aramid fabric prepregs 10 were sequentially laminated thereon, At room temperature for 20 minutes to form a bulletproof helmet.

Table 1 shows the results of evaluating the total weight and physical properties of the manufactured bulletproof helmet.

Example  2

A bulletproof helmet was prepared in the same manner as in Example 1, except that the number of laminated aramid fabric prepregs (10) was changed from 19 to 19 instead of 16.

Table 1 shows the results of evaluating the total weight and physical properties of the manufactured bulletproof helmet.

Example  3

A bulletproof helmet was prepared in the same manner as in Example 1, except that the number of laminated aramid fabric prepregs 10 in Example 1 was changed to 14 instead of 16.

Table 1 shows the results of evaluating the total weight and physical properties of the manufactured bulletproof helmet.

Comparative 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 then solidified to produce a 3,000 denier wholly aromatic aramid fiber.

The aramid fibers were then applied to warp and weft yarns, respectively, and woven into plain weave to produce an aramid fabric having a density of 450 g / m < 2 >.

Next, the aramid fabric prepreg 10 was prepared by coating the aramid fabric prepared above with 13 wt% of a mixed resin containing 65 wt% of phenol resin and 35 wt% of polybutyral resin, compared to the aramid fabric.

Next, 17 aramid fabric prepregs 10 were sequentially laminated in a mold for helmet molding, and then pressed at 160 bar pressure and 150 DEG C for 20 minutes to form a bulletproof helmet.

Table 1 shows the results of evaluating the total weight and physical properties of the manufactured bulletproof helmet.

Comparative Example  2

A bulletproof helmet was produced in the same manner as in Comparative Example 1 except that the number of laminated aramid fabric prepregs (10) was changed to 19 in Comparative Example 1 instead of 17.

Table 1 shows the results of evaluating the total weight and physical properties of the manufactured bulletproof helmet.

Comparative Example  3

A bulletproof helmet was prepared in the same manner as in Comparative Example 1, except that the number of laminated aramid fabric prepregs (10) in Comparative Example 1 was changed to 14 instead of 17.

Table 1 shows the results of evaluating the total weight and physical properties of the manufactured bulletproof helmet.

Evaluation result of bulletproof helmet division Total weight (g) Average speed (V50)
(m / s) Front and rear
Rear deformation (mm) Example 1 1,390 640 18 Example 2 1,400 645 19 Example 3 1,375 639 20 Comparative Example 1 1,390 640 41 Comparative Example 2 1,400 644 40 Comparative Example 3 1,375 639 42

The average speed and rear deformation in Table 2 were evaluated in the following manner.

Average speed ( V50 ) Measure

The average speed (m / s) indirectly indicating the degree of bulletproof performance of the aramid composite was found to be the speed and partial penetration at full penetration using Cal.22 caliber fragment shot (FSP) according to MIL-STD-662F Were measured from averaged speed.

Rear deformation

NIJ LEVEL ⅢA 9mm FMJ The maximum length (mm) of the protruding parts of the rear part during the carburization was measured.

A: Polyurethane foam
B: The aramid fabric prepregs 10 are laminated and cured,
10: aramid fabric prepreg

Claims (8)

(I) a polyurethane foam (A) forming an inner layer of a bulletproof helmet and
(Ii) a laminate (B) laminated and hardened with 14 to 20 layers of high-strength fiber fabric prepregs (10) having a high-strength fiber fabric coated with a resin, said laminate (B) Wherein the intermediate layer and the outer layer of the bulletproof helmet are formed integrally with the foam (A). delete The bulletproof helmet according to claim 1, wherein the resin is a thermosetting resin and a thermoplastic resin. The method according to claim 1, wherein NIJ LEVEL IIA. Wherein the rear deformation of the 9 mm FMJ charcoal is 20 mm or less. The composite fabric of claim 1, wherein the high strength textile fabric is selected from the group consisting of aramid textile fabrics, carbon fiber fabrics, high density polyethylene fiber fabrics, hybrid fabrics of aramid fibers and carbon fibers, hybrid fabrics of aramid fibers and high density polyethylene fibers, and hybrids of carbon fibers and high density polyethylene fibers Wherein the helmet is one selected from the group consisting of a woven fabric and a woven fabric. (I) a first step of laminating a polyurethane foam (A) in a mold for a bulletproof helmet;
(Ii) a polyurethane foam (A) laminated in a bulletproof helmet mold by the first step, and a high strength fiber fabric prepreg (10) in which a high strength fiber fabric is coated with a resin is laminated from 14 to 20 layers 2 steps; And
(Iii) a third step of heating and pressing the polyurethane foam (A) and the high-strength fiber fabric prepregs (10) laminated in the bulletproof helmet mold by the first step and the second step, thereby integrally curing the polyurethane foam Wherein said helmet is attached to said helmet. delete 7. The method of claim 6, wherein the high strength textile fabric is selected from the group consisting of aramid fiber fabrics, carbon fiber fabrics, high density polyethylene fiber fabrics, hybrid fabrics of aramid and carbon fibers, hybrid fabrics of aramid and high density polyethylene fibers, and hybrids of carbon fibers and high density polyethylene fibers And the fabric is one selected from the group consisting of woven fabrics.

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