Aramid fiber cable has light weight, high strength, impact resistant, high temperature resistance, flexibility, excellent properties such as wear-resisting, is the collection structure carries the high-performance specialty materials and functions in one. At present has been widely used in all kinds of weapons and equipment, to promote lightweight, miniaturization, stealth of weapons and equipment, enhance the protective performance has played a vital role, has developed into a modern national defense war industry key support materials.

Before final assembly line in Shanghai China independently developed the first generation jet trunkliner C919, cabin internal structure such as large-scale high-tech high temperature polysulfonamide fiber, flame retardant, not only the excellent corrosion resistance and thermal oxygen aging resistance, also implements the large aircraft "slimming" 30 kg again, means that the aircraft fuel consumption smaller, cheaper, more environmental protection and energy saving.

The aramid cable - set structure and function in one

Aramid, aramid fiber rope, commonly known as heterocyclic its comprehensive performance in aromatic polyamide ranks the first in the family, with a specific strength and specific modulus, low compression strength and excellent properties such as low density, aramid 1414, far more than the performance is very important strategic materials in China. Because with high strength, high modulus, dimension stability, impact resistant, wear resistant, wave, weather resistance, electrical insulation, resistance to fatigue, the characteristics of light quality, aramid Ⅲ integrating bulletproof, invisibility, and other functions, components in aircraft, bulletproof equipment, airborne/spaceborne radar cover, through waveform structure, satellite parts, instrument cabin, motor shell, and other fields have a wide range of applications. In addition, with the development of low-carbon economy, aramid Ⅲ in energy conservation and emissions reduction and equipped with lightweight applications, also become the key materials in the field of high performance fiber composite materials.

One, fanglun cable application domain

Aramid fiber cable as a one of the best comprehensive properties of light weight, high strength material, superior resistance to elastic, lightweight, stealth and structure as a whole, are widely used in our country for a new generation of weapons and equipment research and development and production, meet the strategic weapons, aviation, high-end bulletproof, pressing needs in the field of ship navigation and so on, to enhance our army combat ability, improve the international competitiveness has important strategic significance.

1. The aramid cable is applied to aerospace

The application of aramid rope in aerospace

The new type of aramid composite material can adapt to and meet the harsh space application conditions and wide design range, which is the ideal modern aerospace material. In aerospace,

The aromatic cable reinforced composite material can be widely used in aircraft, rocket and other structural materials with its light and high strength.

In modern aerospace equipment, in addition to the security, the material weight loss effect is particular concern, at each reduced the weight of 1 kg of equipment can reduce the cost of $1 million. As a result, aramid Ⅲ composites because of the specific strength and specific modulus, fatigue resistance, excellent properties such as low density, and the unique materials can design advantages, in the field of aircraft, aerospace and rocket structure has been widely used, making their own quality to reduce, the equipment is able to increase the effective load, save a lot of fuel.

Currently, aramid fiber cable in the solid rocket engine in our country, the coefficient of aramid 1414 containers can be greatly improved properties (container characteristic coefficient = PV/W, P is blasting pressure, volume V is shell, W is the shell quality), reducing engine negative quality, improve the quality of the engine.

Aramid fiber cable composite material can be used in the shell of the aircraft, landing gear doors, cargo hold, interior decoration and seats, etc., aramid 1414 weight loss effect is more apparent. In addition, although have strong competition from carbon fiber in the aerospace field, but the performance characteristics of aramid Ⅲ has significant difference with carbon fibre, respectively applicable to different application requirements. Carbon fiber is a brittle material, poor resistance to impact, not wear-resisting, through wave performance is poor, and aramid Ⅲ and its composite materials have high tensile strength, good toughness, fatigue resistance, impact resistance, through wave, easy processing advantages make it become an irreplaceable key material of aerospace field. In addition, aramid Ⅲ also has low dielectric constant and low dielectric loss factor, low thermal expansion coefficient of performance advantages, such as the performance advantage is very beneficial to promote aramid Ⅲ as structural stealth composites in the wave function in the field of application. Therefore, aramid Ⅲ is outstanding strength, excellent dielectric properties, good heat resistance and resistance to the environment as a whole, in the aerospace, aircraft, weight reduction and energy saving, and other fields that have demonstrated outstanding application value.

2. The bulletproof properties of aramid rope

An aramid rope is used as a bulletproof helmet

Aramid Ⅲ especially as high-end bulletproof material advantages, application in the modern war, riot and terrorism can effectively reduce the load, more conducive to play to the personnel and equipment characteristics of rapid mobility and win victory. Aramid Ⅲ with its lightweight characteristics such as high impact, protective equipment manufacturing in body armor, bulletproof helmets and armor plate with the use of high-end.

Relative to the aramid 1414 and aramid Ⅲ bullet-proof performance is better, making the bulletproof material lighter. Studies have shown that: aramid Ⅲ elastic energy resistance than aramid Ⅱ increase nearly 30% in December 2007, the American wichita, Kansas test laboratory for the research results show that the dynamic strength of aramid Ⅲ than the famous ZAYLON material, farther than Kevlar, and by the aramid Ⅲ preparation of the surface density than Kevlar helmet deck panels 27% lower, but it was 12% higher than a Kevlar bulletproof performance. Many international experts will also Russia aramid 1414 and aramid Ⅲ and ultra-high molecular weight polyethylene material (Spectra and Dyneema, etc.), found that the aramid Ⅲ has more significant weight loss in individual protective space, its performance is optimal in the similar products, in the international leading position of bulletproof products.

In addition, aramid Ⅲ body armor made of impact resistant performance not only better, more soft, more frivolous, and its excellent creep resistance, good heat resistance, and high strength retention at high temperature. Due to the use on the military, more likely to come into contact with fire or hot objects, when the temperature is high, ultra-high molecular weight polyethylene performance will be greatly reduced, no longer bulletproof ability; And aramid Ⅲ and its composite materials because of its excellent creep resistance and heat resistance, impact strength is almost not affected, is the ideal material of the military bulletproof equipment. Aramid Ⅲ by Russia (Armos and Rusa) adopted by the Russian military and law enforcement to a lot of flak jacket, has for decades, it is widely thought to have better stability than aramid 1414 on the environment.

Application in bulletproof helmets, aramid Ⅲ collection of high strength, light quality, easy to mold, protective area increase, style, beautiful and good protection performance as a whole, make the bulletproof helmets are highly V50 value (that is within the scope of the provisions of play speed, penetration probability of 50% for the tested sample of the speed limit), average crater sag depth is shallow, is an ideal material for individual protective helmet. Table 2 shows the blue light in the aramid Ⅲ made bulletproof helmets performance test results.

3. The aramid cable is applied in the field of ship

The aramid rope is used in Marine ships

Aramid Ⅲ as a new functional material structure, light quality, specific strength and specific stiffness, fatigue resistance, high creep resistance, resistance to chemical corrosion, good wear resistance, low thermal expansion coefficient and the wave permeability is good wait for a characteristic, is the attention of the shipbuilding industry, especially in manufacturing high quality of hull structure has a great advantage:

1) nylon Ⅲ obvious advantages on hull lightweight materials, aramid 1414, compared with its higher strength, better resin and invasive, so manufacturing composites can further reduce the boat weight, under the same power can get higher rates of payload, and save fuel, reduce the cost;

Aramid Ⅲ (2) with low dielectric constant and microwave penetrability is good wait for a characteristic, can through the electromagnetic wave and almost don't change the nature of the electromagnetic wave, very suitable for military ships stealth materials;

(3) aramid Ⅲ has good weather resistance, water resistance, corrosion resistance, resistance to sea creatures, more suitable for use in the Marine environment;

(4) compared with 1414, carbon fiber, aramid fiber, aramid Ⅲ can absorb more energy, good resistance to impact toughness, therefore, made by the ship is not easy to damage due to collision, squeezing, and at the same time also can give the boat bulletproof structure, the performance of the flame retardant, resistance to impact and damage to the hull can effectively absorb vibration and under continuous shocks, smooth sailing ship and security.

Aramid Ⅲ set, therefore, high strength, wear resistance, good toughness, high temperature and low temperature resistance, resistance to water and alkali performance advantages, such as to its excellent comprehensive performance to become the ideal material of modern shipbuilding industry. In addition, aramid Ⅲ mine can also be used for the deep crust, body armor, lifeboat, high pressure vessel and propeller manufacturing, etc., can satisfy the need of ship is lightweight, and to improve the level of military show the comprehensive national strength, and has important social and economic significance.

4, weapons

The application of aramid rope in tank

Modern warfare mobility put forward higher requirements for weapons, weapon equipment aramid Ⅲ reinforced composites arises at the historic moment. As a new material, aramid Ⅲ tough wear-resisting, gentleness, have extremely strong shock resistance. Compared with 1414 and carbon fiber, aramid fiber aramid Ⅲ protective performance of weapon and maneuver performance has a greater change, tanks, armoured vehicles and can be rushing protection performance to a new stage. For example, aramid Ⅲ laminate applied on the square, can make the application under more overpressure and scored, can withstand a nuclear blast pressure wave and high temperature thermal radiation, moreover can also prevent chemical and biological weapons, the conventional bullets and shrapnel, etc. As a result, aramid Ⅲ reinforced composite armor weapon, not only can strengthen the protective performance of the weapon, and weight loss effect is obvious, can greatly increase the battlefield maneuver capability of weapon equipment and rapid reaction ability.

Special rope

Aramid Ⅲ and its composite materials is one of the best cable material, than other high-performance fibers such as aramid 1414, ultra-high molecular weight polyethylene, carbon fiber, etc. Because of its strength, corrosion resistance, wear resistance, small density, elastic moderate, texture soft, convenient use, etc, has been widely used in the field of optical fiber cable, high strength rope application. For example: aramid Ⅲ (cable) for optical fiber enhancement effect is remarkable, especially suitable for long distance, big tension optical fiber (cable). In addition, aramid Ⅲ can replace the steel wire rope, used for deep sea fixed rope, lifting rope, anchor rope and the wire of the helicopter and ship mooring and towing flexible rope, it can greatly enhance the rope load strength and durability.

2. Excellent performance of aramid cable

Aramid Ⅲ currently has been widely used in all kinds of weapons and equipment, to promote lightweight, miniaturization, stealth of weapons and equipment, enhance the protective performance has played a vital role, has developed into a modern national defense war industry key support materials. The aramid Ⅲ bearing is the collection structure and functions in one of high performance specialty materials, its light weight, high strength, impact resistance, high temperature resistant, excellent flexibility, wear-resisting and so on performance. This is because

1, the mechanical properties of aramid Ⅲ

Aramid Ⅲ mechanical properties among the top of the batch production of organic fibers. The tensile strength of aramid Ⅲ blue light in the range of 4 ~ 5 400 400 MPa, 30% ~ 50% higher than aramid 1414, more than type high strength carbon fiber T700 level; The range of dynamic modulus is 150 ~ 180 GPa, second only to steel wire and carbon fiber. The density is only 1.43 ~ 1.45 g/cm3, which is a lightweight high strength material, and its composite material weight loss effect is obvious.

1.2 heat resistance and thermal aging

Aramid Ⅲ outstanding heat resistance and heat aging resistance, in nitrogen environment temperature of 538 ℃ or temperature reaches 520 ℃ in air environment to decompose. When heated to 900 ℃ in aramid Ⅲ residual quantity and quality of 58%, and only the carbide and not melt, has the very good thermal stability. In addition, aramid Ⅲ product than import aramid 1414 (Kevlar, Twaron) has more excellent thermal aging performance.

1.3 flame retardancy

Aramid Ⅲ has excellent flame retardant properties, the limiting oxygen index up to 42%, so when it left the flame will not continue to burn. The flame resistant performance is good, do not produce after burning, not help burning.

1.4 stability

Aramid fiber cable can be used for a long time without changing the properties, good moisture resistant, has the good biological stability. Compared with ordinary wet resistance of aramid fiber is poorer, wet aramid fiber will quickly lose its performance. If the aramid Ⅲ placed in hot water for a month, the less strength loss (strength retention rate is higher than other aramid 50% ~ 70%). In addition, aramid Ⅲ good dimensional stability, very low thermal shrinkage rate, when used in 300 ~ 350 ℃, aramid fiber Ⅲ almost no contraction, when used in 400 ~ 450 ℃ temperature shrinkage is less than 4% and aramid Ⅲ high thermal stability, use don't lose their properties at high temperature.

1.5 chemical resistance

Aramid Ⅲ ability, the vast majority of chemicals has excellent acid-proof alkaline, and organic solvent resistance, bleach and bug eat by moth and mildew resistance, has good adhesion to rubber. For example, in the high temperature acid solution after processing, the fracture strength of aramid Ⅲ can remain in the treatment of more than 80% of the former, elongation at break before processing can be maintained more than 90%; In high temperature and alkali solution after processing, the fracture strength of aramid Ⅲ can keep more than 94.5% of the before processing. So in the family of aramid fiber, aramid Ⅲ high-temperature acid alkali is optimal.

1.6 surface infiltration

Infiltrating is better than that of the surface of aramid fiber Ⅲ aramid 1414. Because of its contact Angle with water is small, and its surface is uneven shallow grooves, can increase the specific surface area, when the resin substrate wetting fiber, can penetrate into fiber surface groove, and the formation of the combination of mechanical rivet type. Therefore, compared with aramid 1414, aramid Ⅲ can form higher mechanical binding force and stronger van der Waals force, physical adsorption is conducive to enhance the interfacial bonding strength between the fiber and resin.