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Overview of aramid fiber Aramid fiber is called polyphenylene phthalamide, and together with carbon fiber and ultra-high molecular weight polyethylene fiber, it is known as the world's three major high-performance fibers. It has low relative density, high strength, high modulus, high temperature resistance, Corrosion resistance and insulation, it is widely used in military, aerospace, electronic appliances, transportation, construction, medical and other fields.
Aramid fiber has high strength and certain corrosion resistance, and can be used in the manufacture of rocket engine casings and structural parts such as fuselages, main wings, and tails of aircraft and spacecraft. As the requirements for aerospace materials become more and more demanding, aramid fiber has gradually developed from structural components that can withstand impact forces to secondary structural materials, such as cabin doors and windows, fairing body surfaces, and interior ceilings, partitions, bulkheads, luggage racks, etc. Seats etc.
Aramid fiber is tough and wear-resistant and is used to make tanks and armored vehicles. It can withstand repeated impacts and greatly improve its protective performance. If fiberglass is used, the protective performance is equivalent to half the weight of kevlar materials, and the toughness is not as good as kevlar laminated sheets. Combining the performance advantages of kevlar thin plates and steel armor, the use of "steel-aramid-steel" composite armor can provide certain protection against 700mm thick anti-tank missiles and even neutron bombs. Composite armor of kevlar laminated sheets and steel-aluminum plates is widely used in bulletproof panels for tanks, armored vehicles, nuclear-powered aircraft carriers and warships. Adding an appropriate amount of aramid fiber to bulletproof vests and helmets can reduce the volume and mass while increasing the bulletproof effect by 40%, which will gradually replace the old nylon vests and tank helmets. A soft, high-grade bulletproof vest made of aramid weftless fabric and high-performance polyethylene film, which has better ballistic performance and heat resistance than polyethylene fiber.
The flame-retardant and high-temperature resistance of personal protective equipment is an important condition for ensuring personnel safety. With the development of material science and technology and textile processing technology, flame-retardant protective clothing has gradually developed from temporary flame-retardant finishing and semi-durable flame-retardant finishing to durable flame-retardant finishing and the application of intrinsic flame-retardant materials.
In 2022, my country's aramid production will be 34,600 tons, including 16,500 tons of mid-aramid and 18,100 tons of para-aramid. At present, the localization rate of para-aramid fiber in my country is very low, and it is estimated that the output in 2022 will only account for less than 25% of the world. Although the output of meta-aramid fiber is relatively high, it faces insufficient high-endization and presents a structural problem of low-end export and high-end import. As domestic independent research and development continues to deepen, the level of localization of aramid fiber is expected to increase significantly in the future.
