Development Of High Performance Fibers For Bulletproof Bulletproof Clothing In The World

In addition to industrial applications, high performance

Body armor is a kind of bulletproof clothing that absorbs and dissipates warheads, fragments kinetic energy, prevents penetration, and effectively protects the body's protective parts.

In order to meet the requirements of bullet proof clothing to absorb the kinetic energy of bullets and other projectiles, ballistic materials must be characterized by high strength, good toughness and strong energy absorption capability, mainly based on high strength and high modulus high-performance fibers.

The properties of fiber materials for impact resistance depend on the fracture energy of fibers and the speed of stress wave propagation.

The stress wave is required to diffuse as quickly as possible, while the fracture energy of the fiber under high speed impact should be increased as much as possible.

On the premise of wearability, the bulletproof vest should be light and comfortable without any impact on bullet proof capability. After wearing, it can still perform various movements flexibly. Clothing has the ability to adjust the micro climate environment of the clothing human body system, avoid the moisture accumulation inside the body surface of the bulletproof vest, and cause humility and humility to the human body, and reduce the consumption of physical energy.

At present, the products of the United States, Holland, the United Kingdom, Russia, Germany and Japan are the most popular and the best quality in foreign bulletproof clothing market.

The products of bulletproof products are mainly high performance organic synthetic fibers, such as DuPont, Kevlar, Dinima (Dyneema) fiber of Holland, DSM Spectra ultra high molecular weight polyethylene fiber of Allied Signal company (now Honeywell).

Us: the body protection technology is in the forefront of the industry.

In the field of bulletproof protective clothing, DuPont technology has always been in the forefront of the industry. Since its development in 70s of last century, Kevlar material has been upgraded and has been widely equipped with most armies, policemen in the United States, Germany, France, Britain, Israel and other countries.

At present, Kevlar Xp is the latest patent of the series. Through the new fabric technology and new coating technology, the final product has bulletproof and damage protection functions.

In the trial of DuPont and its independent agency, bullet proof vests made up of 11 layers of Kevlar XP can block bullets on the third floor, and the remaining layers are used to cushion the impact force of the bullet, so as to reduce the trauma of the worn person.

When wearing 44 caliber pistol with bullet proof clothing, Kelar XP can disperse the impact of 15% bullets, and the vest weight is reduced by at least 10%.

According to DuPont, at present, light materials on the market usually refer to 20 to 40 layers of vests, which require 9 layers to stop bullets.

DuPont plans to invest 500 million US dollars to complete the Kevlar expansion in 2010, and the capacity will increase by 25%.

Kevlar XP specially provides a reduction of 15% hidden surface deformation and a weight reduction of at least 10% of bulletproof vest.

In addition, Kevlar XP also has excellent wear resistance between layers.

The company said: "in our experience, we have never seen such an effective bullet blocking and trauma reduction in the light technology solutions like Kevlar XP technology.

This is an exciting new ballistic technology platform, and is the latest example of DuPont's innovative protection of personal safety products.

Kevlar XP technology is designed to provide higher performance and comfort for the end users, and it meets the needs of current and future international standards.

At present, the annual growth rate of Kevlar XP market is more than 10%.

Holland: expanding protective and safety fabric products

Holland TenCate has received orders from the US military Defender M fabric for the production of flame retardant camouflage clothing worn by the US Army and the US Navy.

In 2004, TenCate bought Southern Mills company for about $36 million, specializing in the production of flame retardant fabrics for safety clothing.

Before the acquisition, the company's annual sales volume was about $100 million, mainly produced by its own brand for the American fire and industrial market. After the acquisition, the company expanded its protective safety fabric product line.

At present, Defender M fabric has become the main production material of camouflage clothing in the US Army.

The increasing demand of the US Army and navy has exceeded the existing production capacity of FR rayon and exceeded the existing production capacity of the aramid fiber.

In addition, TenCate's Millenia lightweight fabric contains 60% Kevlar and 40%PBO, which has been pushed into the European market after being put into the US market.

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Holland DSM is the inventor and manufacturer of Dinima.

Dinima is a super strong polyethylene fiber, which provides the maximum strength with the smallest weight. Its weight is 15 times that of steel and 40% higher than that of aramid fiber. It is used for making bulletproof armor and clothing for policemen and soldiers.

The bulletproof vest made by Dinima consists of several layers of Dinima fiber, and the direction of each layer of fiber is perpendicular to the fibers in the adjacent layer.

This unidirectional structure enables it to withstand the energy of impact from bullets or other weapons, and to disperse it faster and more efficiently along the fibers. It can provide strong protection against threats of ammunition including impact Rifles (such as AK47) and explosive devices (such as IEDs).

UK: Kevlar and protective liquid constitute super armor.

British scientists recently developed a kind of liquid protective clothing, which will harden automatically after compression and absorb the impact force produced by impact fragments on its surface.

The technology uses STF to shear dense liquids (when molecules are tightly bonded when subjected to external pressure) and Kevlar fibers and other reinforcing materials.

When the liquid called "bulletproof milk paste" is pasted together with the traditional Kevlar fiber, it absorbs the impact force produced by the bullet and responds to it by thickening.

This new type of liquid bulletproof clothing requires less material, which means that the bulletproof vest will be thinner and lighter. Therefore, it can be used to wrap a wider range of body, and the flexibility of the soldiers will not be greatly disturbed, and the thickness of the bulletproof vest will be reduced to as much as 45%.

The mechanism is: when the bulletproof vest is impacted, the binding way of the molecule is similar to that of milk paste.

Using tablespoons to stir the milk egg paste is the best explanation of this technique - when spoon stirs the milk egg paste, it will feel the spoon has been resisted.

When the liquid components in the liquid protective clothing are bonded together, the body will feel obvious resistance.

The faster the agitation, the harder the milk paste becomes, so when the bullet hits the material at high speed, it will harden quickly and absorb the impact force generated by the impact.

France: Kermel brand fiber fabric can be applied to extreme conditions.

Now, the French army has chosen the Kermel brand V50 and VMC40 fiber fabrics to make equipment and communications integration infantry clothing.

V50 fiber fabrics are mainly used for summer combat clothing, and VMC40 fiber fabrics are used as winter combat clothing.

According to the introduction of the military, the softness of the V50 fiber and the absorptive capacity of FR viscose fiber make the combat clothes very comfortable to wear. Combined with the super heat resistance, the combat suit can adapt to the summer and over seasonal climate.

VMC40 fiber is the latest material developed by Kermel company.

As an ideal choice for wet and cold climates, this fiber feels soft and combines moisture and flame retardancy.

Field tests showed that the two fabrics had natural flame retardancy. After repeated washing, the camouflage protective clothing remained intact.

The two kinds of fabric are all certified by Oeko-Tex 100, and the standard of health protection is reached.

In addition, protective clothing made of Kermel fiber is also used in fireproofing, armored equipment, police arming maintenance equipment, and dangerous operation industries.

The fabric has a non flammable nature and can be maintained in the whole life cycle of the garment.

The garments made of Kermel aramid fiber have superior performance in non fading.

After repeated washing, the fabric can not only maintain camouflage protection, but also maintain its thermal protection ability, which is also an exception under extreme conditions.

China: from raw materials development to production of a dragon

China is another country that can produce bulletproof vest from raw materials to one-stop production after Holland and the United States.

The Iraqi government ordered 20 thousand Chinese bulletproof vests to be used for equipping the police force and importing military garments from China in large quantities.

According to reports, 12 British soldiers stationed in Iraq were attacked by anti US armed forces in Iraq and rushed out of the encirclement at a small cost of one person's death.

The body armor of the British soldier who escaped from death was beaten like a honeycomb by a dense bullets, but no bullet proof clothing was penetrated. The soldier who died was hit by an unprotected brain by a stray bullet.

At that time, the bullet proof clothing worn by British soldiers came from China.

The weight of the bulletproof vest of China is 2 to 5 kilograms. The bullet proof specifications include the pistol and the assault rifle. The strongest bullet proof clothing can block the 7 meter distance of the machine gun, and the machine gun kill of this distance can penetrate the steel plate of two centimeters thick.

With the progress of biotechnology, tough materials like silk and spider silk can be produced in large quantities by means of pgene or synthesis.

The development of nanotechnology will also make the development of flexible and firm bulletproof materials possible.

Related links:

Bullet proof clothes absorb energy.

(1) the tensile deformation of the fabric: the deformation of the incident direction of the finger and the tensile deformation of the vicinity of the incident point.

(2) fabric destruction: fiber breakage, yarn structure disintegration and fabric structure disintegration.

(3) heat energy: the energy of the warhead is distributed by heat in the form of friction.

(4) sound energy: the energy consumed by the sound emitted by the warhead hitting the bullet proof layer.

(5) warhead deformation.