Recently, the project of Taihe New Materials International Creative Center in Yantai City, Shandong Province officially started. Taihe New Materials is one of the para-aramid industrialization enterprises in China. The main purpose of this project is to improve the production line technology and form a project with independent intellectual property rights. At present, the application potential of para-aramid fiber in China is very promising.
The China National Textile and Apparel Council released a list of science and technology awards in 2022. Yizheng Chemical Fiber's research and development of key technologies for the preparation of ultra-high modulus para-aramid fiber won the second prize for technological invention. Yizheng Chemical Fiber has made breakthroughs in key core technologies such as polymerization, spinning, and engineering amplification, and has formed a complete set of para-aramid technology with independent intellectual property rights. The award of Yizheng Chemical Fiber Technology marks that the development of my country's para-aramid fiber industry has made great progress.
Aramid is a class of synthetic aromatic polyamide fibers. The U.S. Federal Trade Commission has adopted a simple definition of aramid as having at least 85 percent of the amide linkages in a polymer molecule directly attached to two aromatic rings. Para-aramid is a kind of aramid fiber, which is formed by condensation polymerization of p-phenylenediamine and terephthaloyl chloride. It is named after the amide group in the para-position of the benzene ring in its structure. Due to the presence of conjugated benzene rings in the main chain of para-aramid fibers, the molecular segments are not prone to internal rotation, thus presenting a linear rigid structure, which has the characteristics of high strength, high modulus, and thermal stability that ordinary fibers do not have. application field.
Para-aramid is recognized as one of the three high-performance fibers, and its discovery is considered to be a very important chapter in the history of material development in the world: it is technically the first fiber made of new polymer liquid crystal spinning technology , which has guiding significance for the development of fibers in the future, and its excellent mechanical properties and high temperature resistance greatly enrich the application fields of man-made fibers.
As an engineering material, para-aramid is widely used in body armor, aircraft, automobiles, etc., and its application potential has aroused increasing interest.
The most important application of para-aramid fiber is in the field of safety protection, mainly because its strength is five times that of steel of the same quality, but its density is only one-fifth of steel. Body armor made of para-aramid is small in size and light in weight. In addition, para-aramid can also form composite materials with other materials, such as metals and ceramics, to prepare a variety of safety protection equipment.
Para-aramid can be used as cord for automobile or aircraft tires. Tires made of para-aramid have light weight, low rolling friction resistance, and higher load-bearing capacity. Especially when applied to truck tires, the life of the tire can be greatly extended.
Para-aramid fiber has strong alkali corrosion resistance and good impact resistance, and is very suitable as a concrete reinforcement material to prevent concrete from cracking between beams. In the 1980s, due to frequent earthquakes and subway construction in Japan, aramid fiber was applied to concrete structures, which not only prolongs the service life of buildings, but also saves repair time and costs.
The discovery and subsequent application development of para-aramid are inseparable from DuPont. As early as 1945, with the commercialization of nylon fiber and the development of polyester fiber, the leadership of DuPont made a long-term development plan, hoping to develop a fiber with both ultra-high strength and high temperature resistance. In the 1960s, DuPont perfected the low-temperature solution polymerization method and studied the process of inorganic salt solution promoting the dissolution of insoluble polymers, which laid the foundation for the birth of aramid fiber. In 1972, DuPont solved the spinning problem of para-aramid, and thus launched commercial para-aramid products.
Countries are not far behind in the research and development of para-aramid, and have launched similar products one after another: Japan's Teijin Corporation began to produce its own para-aramid in 1972, and named it Deknola; the Netherlands' AkzoNobel company in 1986 The product name of the para-aramid fiber launched is Tevalon; South Korea's Kelon Company started research and development in 1979 and realized industrial production in 2005; Russia built a production line as early as 1985, and the product name was Teron, and later turned to the production of miscellaneous Ring aramid.
The research on para-aramid fiber in my country began in 1972. In the following 20 years, it went through several stages of laboratory research, small test and pilot test, and achieved a series of scientific research results, but failed to realize industrialization due to many reasons. In recent years, companies such as Taihe New Materials, Zhonglan Chenguang, and Pingmei Shenma have continued to overcome difficulties in the field of aramid fibers and launched many industrialized products to the market. However, the performance and production capacity of para-aramid fibers are still at the leading level compared with foreign countries. Most of the gaps can only meet low-end applications, and very few can be used in military defense and aerospace. Therefore, the R&D and production of para-aramid fiber and its products is still a technical problem that needs to be solved urgently in our country.
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