KR101097014B1 - bulletproof fabric and bulletproof product using the same - Google Patents

Abstract

The present invention relates to a ballistic fabric, characterized in that the warp and weft yarn made of a multifilament, the release rate of the multifilament ranges from 7 to 25, and a bulletproof product using the same,

According to the present invention, the cross section of the fabric is uniformly formed, the impact resistance is improved by uniform shock absorption is made to the entire fabric during the impact of the bullet.

Bulletproof, release rate

Description

Bulletproof fabric and bulletproof product using the same

The present invention relates to a ballistic fabric, and more particularly, to a ballistic fabric having excellent ballistic performance, and a ballistic product using the same.

Bulletproof fabrics are fabrics used in a variety of bulletproof products, such as body armor, bulletproof helmets, bulletproof boards. Bulletproof products are products for protecting the human body from the fracture of bullets or shells, the bulletproof performance of such bulletproof products is largely dependent on the bulletproof performance of the fabric for bulletproof fabrics.

Conventional antiballistic fabrics have been produced by weaving using nylon or aramid yarns. In addition, when the anti-ballistic fabric absorbs moisture for a long time, the physical properties may be degraded, and thus, the antiballistic property may be degraded. Thus, a water repellent treatment was performed on the fabric obtained through the weaving process.

The anti-ballistic properties of such a bulletproof fabric depends on the structure of the yarn and the fabric constituting the bulletproof fabric, and various proposals have been made on the high strength yarn and the optimal fabric structure until now, but still have the desired antiballistic properties Bulletproof fabrics are not obtained. Accordingly, methods have been developed to increase the number of layers of bulletproof fabrics or to supplement the antiballistic properties of bulletproof fabrics by manufacturing a bulletproof product by adding a thermosetting resin between the bulletproof fabrics. As the weight of the bulletproof product is added, there is a disadvantage.

The present invention is to identify the characteristics of the bulletproof fabric required to suppress the progress of the bullet when proceeding through the bulletproof fabric after the bullet hit the bulletproof fabric, bulletproof fabric and bulletproof products having such characteristics It aims to provide.

1 is a schematic cross-sectional view of a conventional bulletproof fabric, since the yarn constituting the fabric is generally formed close to a circle, the cross section of the fabric is not uniform as shown in Figure 1, weft and warp There is a lot of empty space (A) in between. As such, if a large amount of empty space (A) is present in the fabric, impacts are not uniformly absorbed in the whole fabric when bullets collide, and thus the ballistic performance of the fabric may be degraded.

Accordingly, an object of the present invention is to provide a bulletproof fabric and a bulletproof product using the same that can improve the bulletproof performance by minimizing the empty space existing between the weft and the warp constituting the fabric.

In order to achieve the above object, the present invention provides a ballistic fabric, characterized in that the warp and weft made of a multifilament, the release rate of the multifilament is in the range of 7 to 25.

The multifilament may have a twist number of 10 or less / m.

The multifilament may not have an air entanglement point.

The multifilament may be made of wholly aromatic polyamide multifilament.

The anti-ballistic fabric is a step of preparing a multifilament having an emulsion content in the range of 0.3 to 1% by weight without performing a twisting step and an air entanglement step; And it can be produced through a process comprising the step of weaving the fabric into plain weave or basket weave using the multifilament.

The bulletproof fabric may have a 3A grade V0 of 436 m / s or more in a 44 Magnum bullet test based on the National Institute of Justice (NIJ) standard when 30 to 38 sheets are stacked.

The present invention also provides a bulletproof article using a bulletproof fabric having the characteristics as described above.

According to the present invention as described above has the following effects.

The anti-ballistic fabric according to the present invention does not form a multifilament which is a yarn close to a circle, but forms a release ratio in the range of 7 to 25, thereby minimizing the empty space existing between the weft and the warp yarn constituting the fabric. Therefore, the cross-section of the fabric is uniformly formed, the impact resistance is improved by uniform shock absorption is made to the entire fabric during the impact of the bullet.

Hereinafter, embodiments of the present invention will be described in detail.

1. Bulletproof fabrics and bulletproof products

Figure 2 schematically shows a cross section of the bulletproof fabric according to the invention, Figure 3 shows a cross section of the yarn constituting the bulletproof fabric according to the present invention.

As can be seen in Figure 2, the bulletproof fabric according to the invention is made of weft and warp yarns, Yarn constituting the weft and warp yarns are made of multifilament. As the multifilament, an wholly aromatic polyamide multifilament may be used.

At this time, the multifilament is made of a flat structure rather than a circular, the void space existing between the weft and the warp is significantly reduced compared to the case of using a yarn close to the conventional circular.

In particular, as can be seen in Figure 3, the multifilament has a release rate (D2 / D1) is in the range of 7 to 25. The release rate (D2 / D1) is a method of expressing the cross-sectional structure of the yarn constituting the fabric, calculated by dividing the diameter (D2) of the circumscribed circle by the diameter (D1) of the circumscribed circle based on the cross-sectional center of the yarn. do. If the release rate of the multifilament is less than 7, there is a significant gap between the weft and warp yarns to prevent the desired bulletproof characteristics of the fabric, if the release rate of the multifilament is greater than 25 weaving process of the fabric is difficult This can become impossible.

Although the release rate of the yarn may change due to the contact between the loom and the yarn during the weaving process, the amount of change in the weaving process is insignificant. Therefore, the multifilament constituting the weft and warp yarns in the ballistic fabric manufactured through the weaving process In order to control the release rate in the range of 7 to 25, it is preferable to adjust the release rate of the yarn to the above range before the weaving process. Thus, in order for the yarn before the weaving process to have the above release rate range rather than a circular structure, it is necessary to change the process conditions for preparing the yarn. Specifically, air yarns are not applied to the yarn without twisting the yarn. There is a method of optimizing the amount of emulsion contained in the yarn without performing it.

First of all, in relation to the twisting of the yarn, in general, the yarn is imparted to the yarn by performing the twisting process during yarn manufacturing. When the twisting process is performed in this way, it is difficult to obtain a yarn having the desired release rate in the above range. . Therefore, in the case of the present invention, no twist is given to the yarn obtained by not performing the twisting step in yarn production. However, even if the yarn is not given a twist, weaving process, such as weaving may naturally occur in the yarn, the number of twist is less than about 10 / m. Therefore, the anti-ballistic fabric obtained through the weaving process according to the present invention may have a twist number of 10 or less / m.

Next, with reference to the interlacing of the yarn, it is possible to perform the air entanglement process in the manufacture of the yarn in order to improve the weaving properties, the air entanglement process in this way improves the concentration of the yarn to the yarn The possibility that the cross section is formed in a circular shape is increased. Therefore, in the case of the present invention, the yarn is prevented from being concentrated by not performing the air entanglement process during yarn production, and eventually, the bulletproof fabric obtained through the weaving process according to the present invention may not have an air entanglement point. have.

Next, with reference to the amount of the emulsion contained in the yarn, because the yarn during friction during the weaving process, the oil is coated on the yarn during the manufacture of the yarn in order to facilitate the weaving process, the amount of emulsion coated on the yarn In many cases, it may not be easy to obtain a yarn in the release rate range. Accordingly, the present invention provides a range of 0.3 to 1% by weight in an optimal amount of emulsion for facilitating the weaving process while obtaining yarn in the release rate range. That is, when the content of the oil coating on the yarn is less than 0.3% by weight, weaving is inferior, and when the content of the oil coating on the yarn is larger than 1% by weight, a yarn having a desired release rate range may not be obtained.

Referring to the manufacturing method of the bulletproof fabric according to the present invention as described above, the bulletproof fabric according to the present invention is prepared through the process of preparing a multifilament, and the process of weaving the fabric with the multifilament as the warp and weft. do.

In the step of preparing the multifilament, an aromatic polyamide polymer is prepared by polymerizing an aromatic diamine and an aromatic dieside chloride in a polymerization solvent, and then dissolving the aromatic polyamide polymer in a concentrated sulfuric acid solvent to prepare a spinning dope. Thereafter, the spinning dope may be spun through a spinneret, and then, the spinning material may be solidified to produce a wholly aromatic polyamide multifilament.

In the process of manufacturing the multifilament, it is preferable not to perform the twisting process and the air entanglement process, and to perform the process of coating the oil on the multifilament before the winding process after the spinning process, wherein the content of the oil is 0.3 It may range from 1% by weight.

The obtained multifilament may be composed of 400 to 1,000 monofilament having a fineness of 0.7 to 1.6 denier. If a monofilament with a fineness of 1.6 denier or less is used, a larger number of monofilaments can be used to obtain multifilaments of the same fineness, thereby increasing the absorption force of the impact of the fabric, and the fineness of 0.7 denier If less than monofilament is used, weaving may be degraded during the weaving process of the fabric.

The multifilament is advantageous in improving the ballistic resistance of the fabric is produced that the tensile strength of 22g / d or more. However, the present invention does not specifically limit the fineness and number of monofilaments and the tensile strength of multifilaments.

The process of weaving the fabric may comprise a process of weaving the multifilament as warp and weft yarns and weaving with plain or basket weaving as the fabric structure. The inclined density and the weft density may be 5 to 15 books / cm level, respectively, and the resulting fabric may have a tensile strength in the range of 5,000 to 10,000 N / 5 cm it may be desirable for improved ballistic resistance. However, the present invention does not specifically limit the tensile strength, the warp density and the weft density of the fabric.

After weaving the fabric, a scouring treatment process and a water repellent treatment process may be performed on the fabric.

The refining process is a process of removing the oil or foreign matter attached to the multifilament constituting the fabric, if the water repellent treatment process is performed without performing such a refining process, the water repellent treatment process is not made smoothly The flexibility of may be lowered.

The refining process may be carried out using a surfactant such as NaOH or Na ₂ CO ₃ at 40 ℃-100 ℃, after the surfactant treatment is followed by a washing step and a drying step.

The water-repellent treatment process is a process to prevent the fabric from absorbing moisture, the wholly aromatic polyamide multifilament constituting the fabric is generally a problem that the long-term absorption of water is deteriorated in physical properties and eventually the ballistic characteristics of the fabric is gradually reduced As it occurs, water repellent treatment is performed on the fabric to prevent deterioration of ballistic resistance due to water absorption.

As described above, the water repellent treatment process may be performed by completely removing foreign matters adhered to the surface of the fabric through a refining process, and then immersing the fabric in a fluorine-based or silicone-based water repellent composition and drying the same.

After the water repellent treatment process can be carried out a heat treatment process on the fabric. The heat treatment process may be performed at 120-200 ° C. for about 15-150 seconds. At this time, if the heat treatment temperature is less than 120 ° C. or the heat treatment time is less than 15 seconds, the water repellent effect may be deteriorated. If it exceeds 150 seconds, it can damage the fabric.

The anti-ballistic fabric according to the present invention manufactured by the above process, the cross-section is formed uniformly, the impact resistance is improved by uniform shock absorption to the entire fabric during collision of bullets, specifically, the bulletproof fabric When a 30-38 sheet is stacked, the 3A grade V0 is more than 436m / s when tested with 44 Magnum bullets, which are based on the National Institute of Justice (NIJ) standard.

In addition, the present invention provides a bulletproof article using a bulletproof fabric having the characteristics as described above, the bulletproof article may include a body armor, a bulletproof helmet, a bulletproof plate and the like. The body armor, bulletproof helmet, and bulletproof plate may be manufactured by a known method, wherein the bulletproof helmet and bulletproof plate may not perform the above-described water repellent treatment process.

2. Examples and Comparative Examples

Example 1

Para-phenylenediamine, which is an aromatic diamine, and terephthaloyl dichloride, which is an aromatic dieside chloride, are polymerized in a polymerization solvent in which CaCl ₂ is added to N-methyl-2-pyrrolidone (NMP) to give poly (paraphenylene terephthalate). Amide) polymer was prepared, and then the polymer was dissolved in a concentrated sulfuric acid solvent to prepare a spinning dope, and the spinning dope was spun through a spinneret, and then the coagulum was coagulated in a coagulation bath through an air gap to obtain 1.0 denier mono. After obtaining a wholly aromatic multifilament made up of 1000 filaments having a total fineness of 1000 deniers, 0.3 wt% of an emulsion was coated and dried. At this time, the twisting step and the air entanglement step were not performed.

Thereafter, using the wholly aromatic multifilament as the warp and weft yarns, weaving into a plain weave with a warp density and a weft density of 8.5 each / cm to produce a ballistic fabric.

Example 2

In Example 1 described above, a bulletproof fabric was manufactured by the same method as Example 1, except that 1% by weight of an emulsion was coated.

Comparative Example 1

In Example 1 described above, a ballistic fabric was prepared in the same manner as in Example 1, except that the twisting process was performed such that the wholly aromatic multifilament had a twist number of 50 / m.

Comparative Example 2

In Example 1 described above, a ballistic fabric was prepared in the same manner as in Example 1, except that the air entanglement process was performed such that the wholly aromatic multifilament had an air entanglement point of 10 / m.

Comparative Example 3

In Example 1 described above, a ballistic fabric was prepared by the same method as Example 1, except that 2% by weight of an emulsion was coated.

Table 1 summarizes the process conditions for the production of bulletproof fabrics according to the above Examples and Comparative Examples.

division Continuous process (twist number / m) Air entanglement process (air entanglement point / m) Emulsion content (% by weight) Example 1 Never Never 0.3 Example 2 Never Never 1.0 Comparative Example 1 50 Never 0.3 Comparative Example 2 Never 10 0.3 Comparative Example 3 Never Never 2.0

3. Experimental Example

Release rate measurement

After preparing the sample by cutting the bulletproof fabric prepared according to the above Examples and Comparative Examples to 10cm × 10cm, the release rate (D2 / D1) was calculated.

The release rate (D2 / D1) is a value obtained by dividing the diameter (D2) of the circumscribed circle by the diameter (D1) of the inscribed circle based on the cross-sectional center of the yarn.

Here, the diameter (D1) of the inscribed circle was calculated as "half the thickness of the fabric thickness" after measuring the fabric thickness. The diameter (D2) of the circumscribed circle is a value obtained by measuring the number of inclinations included in the fabric sample of 10 cm and multiplying the value of "10 cm / number of inclinations" by "the ratio of the portion of yarn which is occupied by the space except the space occupied within 10 cm of fabric". Calculated as

In other words, release ratio = diameter (D2) of circumscribed circle / diameter (D1) of circumscribed circle =

[(10cm / number of inclinations) X ratio of part which yarn occupies] 1/2 of thickness of the fabric

A total of 10 calculations of D1 and D2 were performed and then averaged to determine the release rate (D2 / D1). The results are shown in Table 2 below.

division Release rate (D2 / D1) Example 1 9.0 Example 2 8.5 Comparative Example 1 3.8 Comparative Example 2 6.5 Comparative Example 3 6.8

Bulletproof performance measurement

After cutting the bulletproof fabric prepared according to the above Examples and Comparative Examples to 40cm × 40cm to prepare a sample of 32 ply overlap, the samples were subjected to a bulletproof test according to the NIJ (National Institute of Justice) standards. The bullet used in the bulletproof test was 44 magnums. The results are shown in Table 3 below. In the table below, V0 is the maximum velocity at which the bullet does not pass the target.

division Bulletproof performance V0 (m / s) Example 1 442 Example 2 439 Comparative Example 1 424 Comparative Example 2 431 Comparative Example 3 433

Figure 1 schematically shows a cross section of a conventional general ballistic fabric.

Figure 2 schematically shows a cross section of a bulletproof fabric according to the invention.

Figure 3 shows a cross section of the yarn constituting the bulletproof fabric according to the present invention.

Claims (7)

Anti-ballistic fabric, characterized in that the warp and weft made of a multifilament, the release rate of the multifilament ranges from 7 to 25. The method of claim 1, The multifilament is a ballistic fabric, characterized in that the twist number is less than 10 / m. The method of claim 1, The multifilament is bulletproof fabric, characterized in that no air entanglement is formed. The method of claim 1, The multifilament is a ballistic fabric, characterized in that consisting of a wholly aromatic polyamide multifilament. The method of claim 1, The bulletproof fabric, Preparing a multifilament having an oil content in the range of 0.3 to 1% by weight without performing the twisting step and the air entanglement step; And Bulletproof fabric, characterized in that manufactured through a process comprising the step of weaving the fabric into a plain or basket weaving using the multifilament. The method of claim 1, The anti-ballistic fabric is a bulletproof fabric, characterized in that the bulletproof performance (V0) is 436m / s or more based on the NIJ standard 3A grade when laminated 30 ~ 38 sheets. Ballistic product using the bulletproof fabric according to any one of claims 1 to 6.

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