Aramid is mainly divided into two types, para-aramid fiber (PPTA) and meta-aramid fiber (PMIA). , In more than 30 years, aramid fiber has gone through the transition from military strategic materials to civilian materials, and the price has been reduced by nearly half. Now foreign aramid fibers are becoming more and more mature in terms of research and development level and large-scale production. In the field of aramid fiber production, para-aramid fiber develops the fastest, and the production capacity is mainly concentrated in Japan, the United States and Europe. Such as Kevlar fiber of DuPont in the United States, Twaron fiber of Akzo Nobel of the Netherlands (merged with Teijin), Technora fiber of Teijin of Japan and Terlon fiber of Russia. The varieties of meta-aramid fibers include Nomex, Conex, Fenelon and so on. DuPont in the United States is a pioneer in the development of aramid fibers. They are world-class in terms of new product research and development, production scale, and market share. Only the Kevlar fibers they produce currently include Kevlar-49, Kevlar -29 and other more than ten grades, each grade has dozens of specifications of products. DuPont announced last year that it would expand its Kevlar fiber production capacity, which is expected to be completed by the end of this year. Not to be outdone, well-known companies such as Teijin and Hearst in aramid production have expanded or joined forces one after another, and are actively exploring the market, hoping to become a new force in this sunrise industry.
The full name of para-aramid fiber is "poly(p-phenylene terephthalamide)", and the English is Para-Aramid fiber. It is a new type of high-tech synthetic fiber with ultra-high strength, high modulus, high temperature resistance, acid and alkali resistance. , light weight and other excellent properties, its strength is 5 to 6 times that of steel wire, its modulus is 2 to 3 times that of steel wire or glass fiber, its toughness is 2 times that of steel wire, and its weight is only about 1/5 of that of steel wire. At the temperature of 100 degrees, it will not decompose or melt. It has good insulation and anti-aging properties and has a long life cycle. The discovery of aramid 1414 is considered to be a very important historical process in the material industry.
Para-aramid fiber is an important national defense and military material. In order to meet the needs of modern warfare, at present, the bulletproof vests in developed countries such as the United States and the United Kingdom are made of aramid. The lightweight of aramid bulletproof vests and helmets effectively improves the military. rapid response and lethality. During the Gulf War, American and French aircraft used aramid composite materials in large quantities. In addition to military applications, it has been widely used as a high-tech fiber material in various aspects of the national economy such as aerospace, electromechanical, construction, automobiles, and sporting goods. In terms of aviation and aerospace, para-aramid fiber saves a lot of power fuel due to its light weight and high strength. According to foreign data, in the process of launching a spacecraft, every 1 kg of weight reduction means a reduction of 1 million US dollars. the cost of. In addition, the rapid development of science and technology is opening up more new civil space for aramid. According to reports, at present, para-aramid products account for about 7-8 percent of bulletproof vests, helmets, etc., aerospace materials and sports materials account for about 40 percent ; tire frame materials and conveyor belt materials account for about 20 percent . Left and right, and high-strength ropes and other aspects account for about 13 percent .