KR20190101150A - Stab and bullet proof material comprising polyimide coated aramid textile - Google Patents

Abstract

According to the present invention, disclosed are a bullet-proof and sword-proof material comprising a polyimide coated textile that comprises aramid fiber, a manufacturing method thereof, and an article comprising the material. According to an aspect of the present invention, the bullet-proof and sword-proof material is flexible and light, and provides an excellent using feeling of a wearer when being manufactured for body armor. Moreover, bullet-proof or sword-proof performance is excellent, and when the material is used for a long period of time, the bullet-proof or sword-proof performance is not declined. In addition, the bullet-proof and sword-proof material can be easily manufactured compared to excellent performance.

Description

Bulletproof and sword proofing material comprising aramid fabric coated with polyimide {STAB AND BULLET PROOF MATERIAL COMPRISING POLYIMIDE COATED ARAMID TEXTILE}

Disclosed herein are anti-ballistic and anti-glare agents comprising aramid fabric coated with polyimide.

Bulletproof / anti-banging material was developed to protect the human body from bullets, etc., bulletproof / anti-banging material, in addition to mechanical strength should have flexibility and light weight.

Bulletproof / breakproof materials commonly used to date include fabrics made using aramid fibers, high molecular weight polyethylene (HMPE) fibers, mixed weaving methods thereof, and the like.

However, fabrics made of high-strength polyethylene fibers, due to the limitations of mechanical strength, have a low buffering capacity against close-range collisions and ultra-high-speed collisions. Inferior preference is given to fabrics made of fibers.

In addition, the fabric made of aramid fiber has the advantage that the yarn is not easily broken by the impact when the bullet collides with the bulletproof fabric, but the flexibility is lowered compared to the fabric made of polyethylene fiber, so that the impact easily There is a limit that can not be absorbed, there is a limit that the weight is rather high.

On the other hand, in order to take advantage of both high-strength polyethylene fibers and aramid fibers, a method of weaving by mixing these fibers and a method of surface modification of the fibers with a curable resin has also been studied, but a satisfactory result has not been obtained yet. .

Recently, as a way to solve the problem of the fabric produced by using the fibers, a method of modifying the fibers using a shear thickening fluid (Shear Thickening Fluid, STF) has been studied. Shear thickening fluid is a liquid state in the absence of external physical stimulus. When an external impact is applied above a certain critical shear rate, the shear thickening fluid means a substance that changes phase into a solid phase with a sharp increase in viscosity, and has excellent mechanical strength. It is an active field of research due to its superior flexibility compared to bulletproof / detective materials.

Among the shear thickening fluids studied so far, the most popular materials are inorganic particles such as silica particles. Although they are competitive in price compared to materials made of high strength polyethylene fibers or aramid fibers, they have a limitation in that mechanical strength, which is the most important physical property of bulletproof / proof materials, is inferior, and due to the weight of silica particles, light weight is also improved. You are facing limitations you cannot do.

Therefore, there is an urgent need for the development of anti-ballistic / proof materials for excellent mechanical strength, flexibility and lightness.

KR 10-2013-0110303 A

In one aspect, an object of the present invention is to provide a light material with excellent ballistic and anti-glare effect.

In one aspect, it is an object of the present invention to provide a bulletproof and sword-proof material excellent in flexibility.

In one aspect, it is an object of the present invention to provide a bulletproof and anti-banging material excellent in resilience to external impact.

In one aspect, it is an object of the present invention to improve the ballistic and gum proofing effect of fabrics made of aramid fibers.

In one aspect, it is an object of the present invention to provide a bulletproof and anti-banging agent that the anti-ballistic and anti-glare effect is maintained for a long time.

In one aspect, the present invention includes a fabric coated with polyimide (PI), the fabric provides a ballistic or gumproof material, including aramid fibers.

The anti-ballistic or sword proofing material, which is an aspect of the present invention, is flexible and light, and has excellent wearer's feeling in manufacturing a body armor. In addition, excellent mechanical strength and flexibility, excellent ballistic and anti-glare performance, even after long-term use does not deteriorate ballistic and anti-glare performance. In addition, the anti-ballistic or sword-proof material has the advantage of easy manufacturing method compared to excellent performance.

Hereinafter, the present invention will be described in detail.

In one aspect, the invention includes a fabric coated with polyimide (PI), the fabric comprising aramid fibers, ballistic or gum proof material.

In the present specification, the fabric may mean a cloth of a planar body in which warp yarns and weft yarns are interwoven up and down.

The fabric may include, but is not limited to, plain weave, twill weave, or runner weave.

In addition, the polyimide may mean an imide-based polymer including the following repeating unit.

<Figure 1.Repetitive Structure of Polyimide>

The polyimide may include a liquid polyimide.

The anti-ballistic or anti-glare material can obtain excellent anti-ballistic effect, durability and flexibility compared to the case of coating the polyimide of the film form on the fabric by coating the liquid polyimide on the fabric.

The coating may also include an impregnation coating. The anti-ballistic or anti-glare material may be coated with an impregnating coating to obtain a fabric having excellent anti-ballistic effect, durability and flexibility as compared to the case of manufacturing by spray coating a polyimide in another coating method, for example, powder state.

In one embodiment, the aramid fibers may comprise para aramid fibers.

In the present specification, para-aramid fiber is a kind of aramid fiber, and may refer to a fiber having a molecular structure in which at least 85% or more of amide bonds (NHCO-) are bonded. Para aramid may refer to poly-para-phenylene-telephthalamide in which the amide bond is bonded to the para position of the benzene ring, and the repeating unit is shown in the following figure.

<Figure 2. Repetitive Structure of Para-Aramid>

In one aspect, the diameter of the aramid fibers, may be 8 ~ 16μm, preferably 10 ~ 13μm.

In addition, in one aspect, the thickness ratio of the polyimide coating and the fabric, may be 1: 3 to 30. When the polyimide coating is thinner than the above range, the antiballistic or anti-glare effect is weakened. When the polyimide coating is thicker than the above range, the degree of increase in antiballistic effect relative to the increasing weight is insignificant, and the flexibility of the fabric is weakened.

In the above aspect, the weight of the polyimide may be 10 to 40% by weight based on the total weight of the fabric coated with polyimide.

In addition, in one aspect, the present invention may be a bulletproof or anti-sword article including the anti-ballistic or anti-sword agent.

The article is not limited, and may include, but is not limited to, clothing or a hat. In one embodiment, the hat may be a helmet.

In another aspect, the present invention is a method for producing a bulletproof or anti-glare material comprising the step of impregnating a fabric containing aramid fibers in a liquid polyimide.

The process of impregnating the polyimide into para aramid may include performing at a speed of 1 ~ 10m / min at 80 ~ 350 ℃.

In the above method, the solvent may be dimethylacetamide, and the polyimide may be used in an amount of 10 to 90 wt% based on the solvent.

In one aspect, the method may further comprise a heat treatment drying step. The heat treatment drying step, the first heat treatment step of drying for 20 to 40 minutes at 70 ~ 90 ℃; A second heat treatment step of drying at 180 to 220 ° C. for 20 to 40 minutes; And it may include a third heat treatment step of drying for 1 to 20 minutes at 320 ~ 380 ℃.

Preferably the first heat treatment step may be performed for 25 to 35 minutes at 75 ~ 85 ℃, the second heat treatment step may be carried out for 25 to 35 minutes at 195 ~ 205 ℃, the third heat treatment step is 340 ~ 8 to 12 minutes at 360 ℃ can be performed.

Hereinafter, the present invention will be described through production examples and examples. The following Preparation Examples and Examples are only intended to illustrate the present invention, it should not be construed to limit the scope of the present invention through this.

Example 1

Weaving of 190g / m ² fabric into plain weave by using para-aramid yarn of 26.5g / d strength, and then impregnating polyimide resin into para-aramid and then drying 80 ℃ / 30min, 200 ℃ / 30min, 350 ℃ / 10min The product was prepared by heat treatment. The concentration of the polyimide applied at this time is 30% by weight relative to the dimethylacetamide solvent. The content of polyimide is 33% by weight relative to the paraaramid-impregnated fabric including the final polyimide.

20 sheets of the polyimide-impregnated para aramid fabric prepared above for bullet-proof and gum-proof test and 10 layers of untreated para-aramid fabric were laminated to prepare a test specimen, and the total surface density of the prepared specimen was 7600 g / m ^2. to be.

 Example 2

Specimens were prepared under the same conditions as in Example 1 except for using 14 ply of polyimide impregnated para aramid fabric and 19 ply of non-polyimide coated para aramid fabric.

Comparative Example 1

Using a polyimide-coated paraaramid fabric 40 ply, a specimen having a total surface density of 7600 g / m ² was prepared in the same manner as in Example 1.

[Experimental Example] Checking the Ballistic and Sword Effect

Bulletproof dagger effect was measured by the method described in Table 1 below, the results are reported in Table 2. As can be seen in Table 2, it was confirmed that the anti-ballistic and anti-sword performance is greatly improved when using a fabric impregnated with polyimide.

Bulletproof NIJ ^* 0101.06 Ballistic test
Level IIIA: .357 Sig..44Mag. BFS (Back Face Signature / Back Deformation, Ambient Condition) Sword NIJ 0115.00 Anti-stab test-Protection Level 2: Penetration depth of E1, E2 (S1 / P1 Blade, Spike)

^* National Institute of Justice (NIJ): a jurisdiction under the US Department of Justice, designating internationally recognized ballistic test measures

Example 1 Example 2 Comparative Example 1 Bulletproof performance
(NIJ Level IIIA)
-Ambient condition test .357 Sig.
(Rear deformation, mm) 25 27 35 .44 Mag.
(mm) 33 37 50 Sword performance
(NIJ Level 2) Spike (infiltration depth, mm) E1 (0 °) 0 2 10 S1 blade (mm) E1 (0 °) 0 2 13 P1 blade (mm) E1 (0 °) One 5 15 Spike (mm) E2 (0 °) 10 12 28 S1 blade (mm) E2 (0 °) 10 12 30 P1 blade (mm) E2 (0 °) 12 15 35

Claims (14)

Includes fabrics coated with polyimide (PI),
The fabric includes aramid fibers, bulletproof or gum-proof material. The method of claim 1,
The polyimide is a bulletproof or gumproof material comprising a liquid polyimide. The method of claim 1,
The coating includes an impregnation coating, bulletproof or gum-proof material. The method of claim 1,
The aramid fiber comprises a para-aramid fiber, bulletproof or sword-proof material. The method of claim 1,
The diameter of the aramid fiber is a material for bulletproof or sword proofing is 10 ~ 13μm. The method of claim 1,
Bulletproof or sword proofing material having a polyimide coating and a thickness ratio of 1: 3 to 30. The method of claim 1,
The weight of the polyimide,
Based on the weight of the polyimide-coated fabric, 10 to 40% by weight, bulletproof or gum-proof material. The method of claim 1,
The sanction,
The antiballistic or gum proofing material further comprising a fabric not coated with polyimide. The method of claim 8,
The formulation is,
5-25 ply fabric coated with polyimide; And
Bulletproof or gumproofing material comprising 10-25 layers of fabric not coated with polyimide. Ballistic- or ball-proof article comprising the agent of any one of claims 1 to 9. The method of claim 10,
The article is bulletproof or sword-proof article, including a hat or clothing. A method for producing a bulletproof or anti-glare material, comprising impregnating a fabric comprising aramid fibers in a liquid polyimide. The method of claim 12,
The impregnating step is carried out at a temperature of 80 ~ 350 ℃, at a speed of 1 ~ 10m / min, a method for producing a ballistic or anti-ballistic preparation. The method of claim 12,
The method,
Further comprising a heat treatment drying step,
The heat treatment drying step,
A first heat treatment step of drying at 70 to 90 ° C. for 20 to 40 minutes;
A second heat treatment step of drying at 180 to 220 ° C. for 20 to 40 minutes; And
Method for producing a bulletproof or anti-stamping agent comprising a third heat treatment step of drying for 1 to 20 minutes at 320 ~ 380 ℃.