KR20150075646A - Bullet-proof helmet and method for manufacturing the same - Google Patents

Abstract

A bullet-proof helmet according to the present invention comprises: (i) at least one first laminate (A) having an aramid fabric coated with resin and having first aramid fabric prepregs (10), which have one type of shape selected from a circle and a polygon, stacked and cured thereon; and (ii) a second laminate (B) having an aramid fabric coated with resin and having second aramid fabric prepregs (20), which have a cruciform shape, stacked and cured thereon, wherein the first laminate (A) and the second laminate (B) have been stacked and cured integrally, and the second aramid fabric prepregs (20) have been arranged and stacked so that facing protrusion parts (21, 22) can envelop the front surface part and the rear surface part of the bullet-proof helmet. The present invention greatly reduces the deformation of the rear surface of the bullet-proof helmet without an increase in weight in the case of impact on the front surface and the rear surface of the bullet-proof helmet by further reinforcing the front surface part and the rear surface part of the bullet-proof helmet using two or four sheets of the second aramid fabric prepregs (20) instead of one or two sheets of the first aramid fabric prepregs (10).

Description

Bullet-proof helmet and method for manufacturing same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulletproof helmet and a method of manufacturing the bulletproof helmet. More particularly, the present invention relates to a bulletproof helmet and a method of manufacturing the bulletproof helmet.

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.

Another conventionally known bulletproof helmet is an aramid fabric prepreg which has a round or polygonal aramid fabric impregnated or coated with a circular or polygonal aramid fabric as described in Korean Patent No. 10-0936056, , And cured products have been used.

As another conventional bulletproof helmet, a product obtained by laminating and curing the aramid fabric prepregs having a circular or polygonal shape has been used.

However, the conventional bulletproof helmets have a problem in that when the bulletproof helmet is mounted on the ear protector c, which is a side portion of the bulletproof helmet, the rear bulb is significantly deformed when the bulletproof helmet is mounted on the front part (a) or the rear part (b) The reason why the above-described problem arises is that a plurality of pieces of aramid fabric prepregs are stacked on the ear protector c, which is a side portion of the bulletproof helmet, (b), the aramid fabric prepreg pieces are not laminated.

If the aramid fabric prepreg pieces are laminated on the front part (a) and the rear part (b) in order to reinforce the rear surface deformation when the front part (a) and the rear part (b) The rear deformation can be reduced, but the problem arises that the weight of the bulletproof helmet increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bulletproof helmet capable of drastically reducing the rear surface deformation of the front portion (a) and the rear portion (b) of the bulletproof helmet when the bulletproof helmet is landed without increasing the weight of the bulletproof helmet.

In order to achieve the above object, in the present invention, when the first aramid fabric prepregs 10 having a circular or polygonal shape are laminated and cured to produce a bulletproof helmet, one or two of the first aramid fabric prepregs Two or four second aramid fabric prepregs 20 each having a cross-like shape are used, and the second aramid fabric prepregs 20 have opposed protruding portions 21, A bulletproof helmet is manufactured by arranging and laminating the front part (a) so as to surround it.

The front and rear portions of the bulletproof helmet are further reinforced by using two or four pieces of the second aramid fabric prepregs 20 instead of one or two pieces of the first aramid fabric prepregs 10, Even without increasing the weight, it is possible to greatly reduce the rear deformation of the bulletproof helmet when the bullet is hit on the front and rear portions of the helmet.

Figures 1 (a) -1 (c) are schematic plan views of a first aramid fabric prepreg (10).
2 is a schematic plan view of a second aramid fabric prepreg 20;
3 is a perspective view of a bulletproof helmet.
4 is a cross-sectional exemplary view of a bulletproof helmet;

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: (i) a first aramid fabric prepreg 10 having a shape coated with a resin on an aramid fabric and having a shape selected from a circular shape and a polygonal shape, A first laminate (A); And (ii) a second laminate (B) in which a second aramid fabric prepreg (20) coated with a resin on the aramid fabric and having a cross shape is laminated and cured, and the first laminate A and the second laminate B are integrally laminated and cured and the second aramid fabric prepregs 20 are arranged so that the opposed protrusions 21 and 22 surround the front and rear portions of the bulletproof helmet Are stacked.

The first aramid fabric prepregs 10 have a polygonal shape such as a circle, a rectangle, an octagon, etc., as shown in FIGS. 1 (a) to 1 (c), and the second aramid fabric prepregs 20, Have a cross shape as shown in Fig.

Figs. 1 (a) to 1 (c) are schematic plan views of the first aramid fabric prepreg 10, and Fig. 2 is a schematic plan view of the second aramid fabric prepreg 20. Fig.

The first aramid fabric prepreg 10 and the second aramid fabric prepreg 20 may be formed by impregnating or coating the aramid fabric with a resin and the impregnated or coated resin is in a prepreg state .

An aramid fabric is produced by applying an aramid fiber to a warp yarn to produce an oblique beam. The warp beam is then provided to a loom and an aramid fiber is applied as a weft yarn to complete an aramid fabric. 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 aramid 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 aramid fiber used in the production of the aramid fabric is 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.

The aramid 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 aramid 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.

The second aramid fabric prepregs 20 are arranged such that the protrusions 21 and 22 shown in Fig. 2 enclose the front part a and the rear part b of the bulletproof helmet shown in Fig.

3 is a perspective view of a bulletproof helmet.

As shown in FIG. 4, the present invention is preferably such that the first laminate (A) is composed of two and one second laminate (B) is located between the two first laminate (A) Do.

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

Each of the two first layered products A shown in FIG. 4 is preferably laminated and cured to form the seventh to tenth layers of the first aramid fabric prepreg 10 in order to lighten the bulletproof helmet and to improve the elasticity of the bulletproof helmet.

The second layered product (B) shown in FIG. 4 is a layered product obtained by laminating and curing the second to fourth layers of the second aramid fabric prepreg (20) when the frontal part (a) or the rear part (b) .

As the resin impregnated or coated on the aramid fabric, a thermosetting resin or a thermoplastic resin is used.

The bulletproof helmet according to the present invention may be manufactured by using two or four pieces of the second aramid fabric prepregs 20 instead of one or two pieces of the first aramid fabric prepregs 10, The rear face direction is greatly reduced when the front face portion (a) or rear face portion (b) of the bulletproof helmet is landed without increasing the weight or reducing the bulletproof performance.

The total weight of the bulletproof helmet according to the present invention is 1400 g or less, and the rear surface deformation of the bulletproof helmet front and rear portions of the NIJ LEVEL ⅢA 9 mm FMJ bullet is within 20 mm.

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

First, a first step of laminating the first aramid fabric prepregs 10, which are coated with a resin on the aramid fabric and have a shape selected from a circular shape and a polygonal shape, into a mold for a bulletproof helmet is carried out.

Next, the first aramid fabric prepregs 10 laminated in the mold for the bulletproof helmet are coated with a resin on the aramid fabric, and the second aramid fabric prepregs 20 having a cross- Are laminated so as to surround the front and rear portions of the bulletproof helmet.

Next, a third step of laminating the first aramid fabric prepregs 10 on the second aramid fabric prepregs 20 laminated in the bulletproof helmet mold is performed by the second step.

Finally, the first aramid fabric prepregs 10 and the second aramid fabric prepregs 20 laminated in the bulletproof helmet mold are heated and pressed by the first, second, and third processes, And the fourth step of curing is carried out to produce a bulletproof helmet.

7 to 10 layers of the first aramid fabric prepreg 10 are laminated in each of the first step and the third step and 2 to 4 layers of the second aramid fabric prepreg 20 are laminated in the second step It is preferable to maintain the light weight and the elasticity of the bulletproof helmet while reducing the rear surface deformation when the bulletproof helmet is mounted on the front and rear portions.

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 prepared as described above was cut into a rectangular shape, and then a mixed resin in which 65% by weight of a phenol resin and 35% by weight of a polyvinyl butyral resin were mixed was coated with 13% by weight of the aramid fabric, A fabric prepreg 10 was produced.

On the other hand, the aramid fabric prepared as described above was cut into a cross shape as shown in FIG. 2, and then a mixed resin in which 65% by weight of phenol resin and 35% by weight of polyvinyl butyral resin were mixed was coated with 13% by weight of aramid fabric A second aramid fabric prepreg 20 was prepared.

Next, eight sheets of the first aramid fabric prepregs 10 prepared as described above were stacked in order in the mold for helmet molding (first step), and then the second aramid fabric prepregs 10, The second aramid fabric prepreg 20 is placed and laminated (the second step) so that the protrusions 21 and 22 surround the front portion a and the rear portion b of the bulletproof helmet, Eight legs 10 were stacked (third step), and then press-molded under a pressure of 160 bar and a temperature of 150 캜 for 20 minutes to prepare a bulletproof helmet.

Table 2 shows the results of evaluating the total weight and physical properties of the manufactured bulletproof helmet.

Example  2 to Example  4

The procedure of Example 1 was repeated except that the shape of the first aramid fabric prepreg 10 and the number of laminated prepregs in the first to third steps were changed as shown in Table 1, A helmet was prepared.

Table 2 shows the results of evaluating the total weight and physical properties of the manufactured bulletproof helmet.

Manufacturing conditions division
Form (g) of the first aramid fabric prepreg 10 Number of prepreg stacked sheets First step Second Step Third step Example 1 Rectangle 8 2 8 Example 2 circle 8 2 8 Example 3 hexagon 7 4 8 Example 4 octagon 8 4 7

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 thus prepared was cut into a rectangular shape, and then 13% by weight of a mixed resin containing 65% by weight of a phenol resin and 35% by weight of a polyvinyl butyral resin was coated on the aramid fabric to form a rectangular aramid fabric prepreg .

Next, 17 rectangular aramid fabric prepregs prepared as described above were sequentially laminated in the mold for helmet molding, and then the bulletproof helmet was produced by press molding at 160 bar pressure and 150 캜 for 20 minutes.

Table 2 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 1,400 640 18 Example 2 1,400 645 19 Example 3 1,400 639 20 Example 4 1,400 642 18 Comparative Example 1 1,400 640 40

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: First laminate B: Second laminate
10: First aramid fabric prepreg
20: Second aramid fabric prepreg
21, 22: the protrusion of the second aramid fabric prepreg (20)
a: Front of bulletproof helmet
b: Rear of the bulletproof helmet
c: Bulletproof Helmet Ear Protector
d: Head protector of bulletproof helmet

Claims (10)

(I) at least one first laminate (A) laminated and cured with first aramid fabric prepregs (10) coated with a resin on the aramid fabric and having a shape selected from a circle and a polygon; And
(Ii) a second laminate (B) in which a second aramid fabric prepreg (20) coated with a resin on the aramid fabric and having a cross shape is laminated and cured,
Wherein the first laminate A and the second laminate B are integrally laminated and cured and the second aramid fabric prepregs 20 are opposed to each other so that opposed protrusions 21 and 22 protrude from the front surface of the bullet- And a rear portion of the bullet-proof helmet. The bulletproof helmet according to claim 1, wherein the first laminate (A) is composed of two, and one second laminate (B) is positioned between the two first laminate (A). The bulletproof helmet according to claim 2, wherein 7 to 10 layers of the first aramid fabric prepreg (10) are laminated and cured in each of the two first laminated bodies (A). The bulletproof helmet according to claim 2, wherein the second laminate (B) is formed by laminating two or four layers of the second aramid fabric prepreg (20). The bulletproof helmet according to claim 1 or 2, wherein the resin is one kind of resin selected from a thermoplastic resin and a thermosetting resin. The bulletproof helmet according to claim 1 or 2, wherein the total weight is 1,400 g or less. 3. The method according to claim 1 or 2, wherein NIJ LEVEL IIA. 9 mm The bulletproof helmet for the FMJ bullet has a rear deformation of 20 mm or less at the front portion and the rear portion. (I) a first step of laminating a first aramid fabric prepreg (10) coated with a resin on an aramid fabric and having a shape selected from a circular shape and a polygonal shape, in a mold for a bulletproof helmet;
(Ii) a second aramid fabric prepreg (20) coated with a resin on the aramid fabric on the first aramid fabric prepregs (10) stacked in the bulletproof helmet mold by the first process, A second step of stacking the protruding portions (21, 22) facing each other so as to surround the front portion and the rear portion of the bulletproof helmet;
(Iii) a third step of laminating the first aramid fabric prepregs 10 onto the second aramid fabric prepregs 20 laminated in the bulletproof helmet mold by the second step; And
(Iv) heating and pressing the first aramid fabric prepregs 10 and the second aramid fabric prepregs 20 laminated in the bulletproof helmet mold by the first, second, and third processes, And a fourth step of curing the bulletproof helmet. The method of manufacturing a bulletproof helmet according to claim 8, wherein 7 to 10 layers of the first aramid fabric prepreg (10) are laminated in each of the first step and the third step. The method of manufacturing a bulletproof helmet according to claim 8, wherein the second aramid fabric prepreg (20) is laminated in the second step.

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