KR20130110303A - Ballistic sheet and ballistic helmet comprising the same - Google Patents

Abstract

PURPOSE: A bullet proof sheet and a bullet proof helmet including the same are provided to prevent polymer matrix from stripped from fabric networks which is coated with the polymer matrix for enhancing durability. CONSTITUTION: A bullet proof sheet comprises fiber networks and polymer matrix. The fiber network is woven fabric. The first fibers are warps. The second fibers are wefts. The fabric comprises the first and the second fibers and the fiber rate of the first and the second fiber is 1:1-100:1.

Description

Bulletproof Sheet and Ballistic Helmet Including It {Ballistic Sheet and Ballistic Helmet Comprising The Same}

TECHNICAL FIELD The present invention relates to a bulletproof sheet and a bulletproof helmet including the same, and more particularly, to a bulletproof sheet and a bulletproof helmet including the same, which can effectively prevent delamination of the polymer matrix from the fiber network.

Conventional methods for manufacturing bulletproof sheets used in the production of bulletproof helmets, by dipping a network of high-strength fibers in a polymer resin and drying to produce a bulletproof sheet, laminated a plurality of bulletproof sheets thus prepared and molded into a helmet shape It was.

However, when manufacturing a bulletproof sheet through an immersion process, it was difficult to control the amount of the polymer resin impregnated in the fabric to a certain level. In addition, as a problem due to the impregnation method itself by dipping, the amount of the polymer resin impregnated in the fabric is too large, there is a problem that makes it difficult to reduce the weight of bulletproof products.

As a method for solving such a problem, the present inventors produce a ballistic sheet by laminating a polymer film having a predetermined surface density on one side of a high-strength fiber network, and then stacking and molding the plurality of bulletproof sheets thus manufactured. Has been developed and filed with Korean Patent Application No. 10-2009-0066842.

However, in both the above dipping method and the laminating method, because the fiber network and the polymer resin in different phases are bonded (that is, because the fiber network in the solid state and the polymer resin in the liquid state are bonded), There was a problem that the adhesive force was not sufficient.

The weak adhesion between the fiber network and the polymer resin caused peeling of the polymer resin from the fiber network, resulting in a decrease in the ballistic performance of the bulletproof helmet.

Accordingly, the present invention relates to a bulletproof sheet and a bulletproof helmet including the same, which can prevent problems caused by the above limitations and disadvantages of the related art.

One aspect of the present invention is to provide a bulletproof sheet that can effectively prevent peeling of a polymer matrix from a fiber network.

Another aspect of the present invention is to provide a bulletproof helmet having improved durability by preventing the polymer matrix from being peeled off from the fiber networks coated with the polymer matrix.

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. The objects and other advantages of the present invention will be realized and attained by the structure specified in the description and claims.

In order to achieve the above advantages, and in accordance with the purpose of the present invention, first fibers having a tenacity of at least 11 g / denier and a tensile modulus of at least 200 g / denier and a melting point of at most 150 ° C. A fiber network comprising two fibers; And a polymer matrix coated on the first and second fibers.

In another aspect of the invention, a ballistic helmet comprising a plurality of ballistic sheets, each of the plurality of ballistic sheets, the first fibers having a strength of at least 11g / denier and a tensile modulus of at least 200g / denier and less than 150 ℃ A fiber network comprising second fibers having a melting point; And a polymer matrix on the first fibers, wherein the second fiber is fused to the polymer matrix.

According to the present invention, by effectively preventing the polymer matrix from being peeled off from the fiber networks coated with the polymer matrix, the bulletproof performance of the bulletproof helmet can be maintained for a long time, and the durability thereof can be improved.

Hereinafter, embodiments of the bulletproof sheet of the present invention and a bulletproof helmet including the same will be described in detail.

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.

The antiballistic sheet of the present invention comprises a fiber network and a polymer matrix. The fiber network comprises first fibers having a strength of at least 11 g / denier and a tensile modulus of at least 200 g / denier and second fibers having a melting point of 150 ° C. or less. The polymer matrix is coated on the first and second fibers.

The high strength first fiber may be an aramid fiber or an ultra high density polyethylene fiber, and the low melting second fiber may be a polyester fiber.

According to a first embodiment of the invention, the fiber network is a woven fabric comprising the high strength first fibers as warps and the low melting second fibers as wefts. .

For example, a fabric having a weight per unit area of 150 to 520 g / m ² using aramid fibers having a linear density of 600 to 3000 denier as a warp yarn and polyester fibers having a low melting point of about 110 to 150 ° C. as a weft yarn, respectively. To prepare. Specifically, after fabricating the warp beam by applying the aramid fibers to the warp, the warp beam may be installed on the loom, and the fabric may be completed by weaving by applying the low-melting polyester fiber to the weft.

According to a second embodiment of the invention, the fabric is a fabric comprising the first and second fibers as warps and the first fibers as wefts.

In this case, the number ratio of the first and second fibers among the warp may be 1: 1 to 100: 1. Among the warp yarns, it is preferable that the number of the first fibers having high strength is one or more times the number of the second fibers having the low melting point in terms of ballistic performance. Further, in consideration of the object of the present invention of improving adhesion between the fiber network and the polymer matrix, it is preferable that the number of the first fibers of high strength among the warp yarns is 100 times or less of the number of the second fibers of low melting point.

According to a third embodiment of the invention, the fiber network comprises an air-textured yarn comprising the first fiber as a core yarn and the second fiber as an effect yarn. It is a woven fabric.

On the other hand, the content and composition of the polymer matrix of the present invention may differ depending on the way of adding the polymer matrix to the fiber network.

When a dipping method of impregnating the polymer matrix composition in the fiber network is applied, the polymer matrix may include a phenol resin, and optionally further include a small amount as an additive for imparting ductility of the polyvinyl butyral resin. The phenol resin imparts excellent hardness to the bulletproof sheet of the present invention.

In the case of the dipping method, the weight ratio of the polymer matrix to the fiber network is 20 to 38%. If the weight ratio is less than 20%, the polymer matrix may not sufficiently protect the fiber network and the fiber network may be easily damaged by external friction. On the other hand, when the weight ratio exceeds 38%, the lightweight bulletproof helmet cannot be manufactured due to the weight increase of the bulletproof sheet.

Specifically, the dipping method is used to immerse the fiber network in a polymer resin diluted with a solvent (for example, methanol) for 10 to 60 minutes. The polymer resin may include a phenol resin, and may further include a small amount of polyvinyl butyral resin as an additive for selectively providing ductility. The dipping process can be repeated several times so that the polymer resin can be uniformly impregnated throughout the fiber network.

Next, a bulletproof sheet is obtained by drying the polymer resin impregnated into the fiber network by the dipping step. The drying process may be continuously performed by passing through the chamber at which the fiber network impregnated with the polymer resin is maintained at a predetermined temperature at a predetermined rate.

On the other hand, in order to control the content of the polymer resin in the bulletproof sheet, it is possible to adjust the concentration of the polymer resin diluted with the solvent. In addition, before the drying step, the step of squeezing the fiber network impregnated with the polymer resin may be further performed. For example, the weight ratio of the polymer resin to the fiber network can be adjusted to 20 to 38%.

The squeegeeing process may be performed continuously using a pressure roller, or may be performed discontinuously using a pressure plate.

On the other hand, when a laminating method of coating the polymer matrix composition in the form of a film on one side of the fiber network is applied, the polymer matrix is 20 to 70% by weight of phenol resin, 20 to 70% by weight of polyvinyl butyral resin, and 1 To 10% by weight of plasticizer.

The plasticizer may be dioctyl phthalate (DOP), dioctyl adipate (DOA), tricresyl phosphate (TCP), or diisononyl phthalate (DINP).

When the content of the polyvinyl butyral resin is less than 20% by weight, the adhesion between the fiber network and the polymer matrix and the adhesion between the bulletproof sheets may be reduced.

In the case of the laminating method, the weight ratio of the polymer matrix to the fiber network is 10-18%. When the weight ratio is less than 10%, the adhesion between the fiber network and the polymer matrix and the adhesion between the bulletproof sheets may be weakened, thereby lowering the ballistic performance. On the other hand, if the weight ratio exceeds 18%, the weight reduction of the bulletproof sheet, which is an advantage of the laminating method, may not be fully utilized.

The laminating method will be described in detail, and a polymer film is formed separately from the fiber network manufacturing process. The polymer film comprises 20 to 70 weight percent phenolic resin, 20 to 70 weight percent polyvinyl butyral resin, and 1 to 10 weight percent plasticizer. The polymer film is formed to have a surface density and a thickness such that the weight ratio of the polymer film to the fiber network is 10-18%.

Subsequently, the polymer film is laminated on one side of the fiber network. That is, the step of placing the polymer film on one side of the fiber network, drying the fiber network on which the polymer film is placed for 1 to 7 minutes at 20 to 60 ℃, and the fiber network and polymer at 100 to 130 ℃ The steps of applying pressure to the film are carried out sequentially.

Mounting the polymer film on the fiber network may be performed through a continuous or discontinuous process. According to the continuous process, the polymer film is placed on the fiber network while the fiber network and the polymer film are each fed simultaneously by separate feed rollers. On the other hand, in a discontinuous process, the fiber network and the polymer film having substantially the same shape and size are aligned with each other and then the polymer film is placed on the fiber network.

The drying process may be continuously performed using a chamber or the like. In this case, it is possible to allow the fiber network on which the polymer film is loaded to pass through the chamber (s) maintained at 20 to 60 ° C. at a rate of 4 to 20 m / min. If the drying temperature is less than 20 ℃ can not be dried smoothly, on the other hand if the drying temperature exceeds 60 ℃ the polymer resin of the polymer film may be cured by the adhesive strength of the bulletproof sheet may be reduced.

The pressing process may be performed continuously using a pressure roller heated to 100 to 130 ° C., or may be performed discontinuously using a pressure plate. In this case, at least a portion of the second fibers of the low melting point of the fiber network and at least a portion of the polymer film may be melted and fused to each other.

Subsequently, after stacking a plurality of bulletproof sheets manufactured by the above-described method, the bulletproof helmet of the present invention is completed by molding the laminate using a mold for manufacturing a helmet. The molding process may be carried out at a temperature above the melting point of the second fiber, for example, a temperature of 120 to 160 ℃.

The antiballistic helmet of the present invention manufactured as described above, comprises a plurality of bulletproof sheets, each of the plurality of bulletproof sheets, the first fibers having a strength of 11g / denier or more and a tensile modulus of 200g / denier or more and less than 150 ℃ A fiber network comprising second fibers having a melting point of and a polymer matrix on the first fiber, the second fiber being fused to the polymer matrix.

As described above, the anti-ballistic sheet of the present invention further includes second fibers having a low melting point of 150 ° C. or lower in addition to the high-strength first fibers, thereby applying heat and pressure to the laminate after laminating the bulletproof sheets. In the process of molding, the second fibers are fused to the polymer matrix.

In other words, at least one portion of the second fiber and at least one portion of the polymer matrix are melted together and converted into the same liquid state, and are mixed and adhered to each other during the forming process by heat and pressure. As a result, the polymer matrix more effectively wraps the high strength first fibers. In addition, at least a portion of the second fiber melts during molding to function as an adhesive with the polymer matrix. Thus, according to the present invention, the adhesion between the fiber network and the polymer matrix can be significantly improved.

Hereinafter, the present invention will be described in detail through examples and comparative examples. However, the following examples are only intended to help the understanding of the present invention should not be limited to the scope of the present invention.

Example  One

410 by weaving aramid fibers with a fineness of 1500 denier (Kolon Industries, Inc., Herakron ^® ) as a weft, and polyester fibers having a melting point of 130 ° C (manufacturer: Huvis, product name: LMF) as weft yarns, respectively. Fabrics having a surface density of g / m 2 were prepared.

Subsequently, the fabric was dipped into a phenol resin diluted with methanol, followed by a squeegeeing process using a pressure roller. Subsequently, the bulletproof sheet was completed by drying the fabric impregnated with phenol resin through a drying chamber at a rate of 5 m / min at a temperature of 70 ° C. The weight ratio of the phenolic resin to the fabric was 18%.

Subsequently, after stacking 18 bulletproof sheets obtained by the above method, the bulletproof helmet was completed by molding the laminate at 150 ° C. using a mold for manufacturing a helmet.

Example  2

Fabric was prepared in the same manner as in Example 1. Next, a polymer film having a surface density of 80 g / m 2 was prepared. The polymer film contained 48 weight percent phenol resin, 48 weight percent polyvinyl butyral resin, and 4 weight percent plasticizer. Subsequently, the polymer film was placed on one side of the fabric and dried at a temperature of 45 ° C. for about 3.75 minutes. Next, a bulletproof sheet was completed by pressing at a temperature of 115 ° C. using a heated pressure roller.

Subsequently, after stacking 18 bulletproof sheets obtained by the above method, the bulletproof helmet was completed by molding the laminate at 150 ° C. using a mold for manufacturing a helmet.

Example  3

Aramid fiber with a fineness of 1500 denier (Kolon Industries, Ltd., Herakron ^® ) and polyester fiber (manufacturer: Huvis, product name: LMF) having a melting point of 130 ° C., and aramid fiber with a fineness of 1500 denier (Kolon) Fabrics having a surface density of 410 g / m 2 were prepared by performing plain weave using Industry Corporation, Heracron ^® ) as the weft yarns, respectively. The number ratio of the aramid fiber and the polyester fiber among the warp yarns was 10: 1.

Subsequently, the fabric was dipped into a phenol resin diluted with methanol, followed by a squeegeeing process using a pressure roller. Subsequently, the bulletproof sheet was completed by drying the fabric impregnated with phenol resin through a drying chamber at a rate of 5 m / min at a temperature of 70 ° C. The weight ratio of the phenolic resin to the fabric was 18%.

Subsequently, after stacking 18 bulletproof sheets obtained by the above method, the bulletproof helmet was completed by molding the laminate at 150 ° C. using a mold for manufacturing a helmet.

Example  4

Using aramid fibers (Koron Industry Co., Ltd., Herakron ^® ) having a fineness of 1500 denier as the core yarn and polyester fibers having a melting point of 130 ° C. as the effect yarn (manufacturer: Huvis, product name: LMF), respectively An air-textured yarn was prepared. Subsequently, the fabric having a surface density of 410 g / m 2 was prepared by performing plain weave using the air entangled yarn as warp and weft yarns.

Subsequently, the fabric was dipped into a phenol resin diluted with methanol, followed by a squeegeeing process using a pressure roller. Subsequently, the bulletproof sheet was completed by drying the fabric impregnated with phenol resin through a drying chamber at a rate of 5 m / min at a temperature of 70 ° C. The weight ratio of the phenolic resin to the fabric was 18%.

Subsequently, after stacking 18 bulletproof sheets obtained by the above method, the bulletproof helmet was completed by molding the laminate at 150 ° C. using a mold for manufacturing a helmet.

Comparative Example  One

Respectively using the aramid fibers having a fineness of 1500 denier (Kolon Industries Inc., Hercules Crohn ^®) in warp and weft was produced by performing a plain weave fabric having a surface density of 410 g / ㎡.

Subsequently, the fabric was dipped into a phenol resin diluted with methanol, followed by a squeegeeing process using a pressure roller. Subsequently, the bulletproof sheet was completed by drying the fabric impregnated with phenol resin through a drying chamber at a rate of 5 m / min at a temperature of 70 ° C. The weight ratio of the phenolic resin to the fabric was 18%.

Subsequently, after stacking 18 bulletproof sheets obtained by the above method, the bulletproof helmet was completed by molding the laminate at 150 ° C. using a mold for manufacturing a helmet.

Comparative Example  2

Fabrics were prepared in the same manner as in Comparative Example 1. Next, a polymer film having a surface density of 80 g / m 2 was prepared. The polymer film contained 48 weight percent phenol resin, 48 weight percent polyvinyl butyral resin, and 4 weight percent plasticizer. Subsequently, the polymer film was placed on one side of the fabric and dried at a temperature of 45 ° C. for about 3.75 minutes. Next, a bulletproof sheet was completed by pressing at a temperature of 115 ° C. using a heated pressure roller.

Subsequently, after stacking 18 bulletproof sheets obtained by the above method, the bulletproof helmet was completed by molding the laminate at 150 ° C. using a mold for manufacturing a helmet.

The durability (peel strength) of each bulletproof helmet manufactured by the above examples and comparative examples was measured by the following method and the results are shown in Table 1 below.

Bulletproof helmet durability Peel strength ) Measure

The durability (peel strength) of the bulletproof helmet was measured using a peel test method according to ASTM D903.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 durability
(Peel strength)
(kgf)
6.45
6.49
6.32
6.65
6.23
6.30

Claims (9)

A fiber network comprising first fibers having a tenacity of at least 11 g / denier and a tensile modulus of at least 200 g / denier and second fibers having a melting point of 150 ° C. or lower; And
A ballistic sheet comprising a polymer matrix coated on the first and second fibers. The method of claim 1,
And the fiber network is a woven fabric. 3. The method of claim 2,
The first fibers are warps of the fabric,
And the second fibers are wefts of the fabric. 3. The method of claim 2,
And the fabric comprises the first and second fibers as warp yarns, wherein the number ratio of the first and second fibers among the warp yarns is 1: 1 to 100: 1. The method of claim 1,
And the fiber network comprises an air-textured yarn comprising the first fiber as a core yarn and the second fiber as an effect yarn. The method of claim 1,
The first fiber is aramid fiber or ultra high density polyethylene fiber,
The second fiber is a ballistic sheet, characterized in that the polyester fiber. The method according to claim 6,
And the polymer matrix comprises a phenolic resin. The method according to claim 6,
And the polymer matrix comprises 20 to 70% by weight of phenolic resin, 20 to 70% by weight of polyvinyl butyral resin, and 1 to 10% by weight of plasticizer. In the bulletproof helmet comprising a plurality of bulletproof sheets,
Each of the plurality of bulletproof sheets,
A fiber network comprising first fibers having a strength of at least 11 g / denier and a tensile modulus of at least 200 g / denier and second fibers having a melting point of 150 ° C. or lower; And
A polymer matrix on the first fibers,
Ballistic helmet, characterized in that the second fiber is fused to the polymer matrix.