Carbon fiber can be divided into polyacrylonitrile based carbon fiber, pitch based carbon fiber, viscose based carbon fiber and so on. Polyacrylonitrile based carbon fiber is the most widely used, accounting for about 90%, which is applied in many industries and is a very important material. So, how did the polyacrylonitrile carbon fiber be made? After reading the following, you will know.
1, the first pan based and comonomer (including methyl acrylate and methylene succinic acid) polymerization, generating Copolyacrylonitrile resin, and then mixed with the dissolved solution of sodium thiocyanate, two dimethyl sulfoxide, two methyl amide, nitric acid, the formation of liquid viscosity spinning suitable, reoccupy wet or dry jet – wet spinning and spinning, made of polyacrylonitrile fiber.
2, the polyacrylonitrile fiber into pre oxidation furnace, oxidation at about 400 DEG 0.5&mdash in air; 4h, after crosslinking, oxidation and cyclization reactions, H2O, HCN, NH3 release and H2 decomposition products, forming a ladder polymer structure good, this is the pre oxidized fiber.
3, then immediately into the carbonization furnace, in high purity nitrogen under the action of the tension is heated to 1500 DEG C, through a series of chemical reactions, H2O, HCN, re release of NH3, H2 and tar, carbon fiber will increase to more than 90%, forming a two-dimensional carbon ring plane mesh structure and rough layer parallel turbostratic graphite structure, it is polyacrylonitrile based carbon fiber.
The manufacturing method of polyacrylonitrile based carbon fibers is simply the above 3 steps. It was invented by Kondo Akio, a Japanese scholar in 1959. For many years, technology has been improved and improved. Carbon fiber is a hot word now. Carbon fiber glasses, carbon fiber fishing rods, carbon fiber aircraft, and all products are all made of carbon fiber.
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