We often hear these three words for carbon fiber, it is understood only is carbon fiber, but also the classification of the carbon fiber, carbon fiber, carbon fiber, carbon fiber asphalt viscose carbon fiber three categories, the most widely used polyacrylonitrile based carbon fiber and the amount of the largest and fastest growing. Today to introduce the preparation method of polyacrylonitrile carbon fiber.
The first few acrylonitrile and other monomers (acrylic acid methyl ester, butyl ester two methylene) polymerization, copolymerization of polyacrylonitrile resin is formed, then the copolymerization of polyacrylonitrile after sodium thiocyanate, two DMSO, nitrate and zinc chloride solution was dissolved, the formation of liquid viscosity is suitable for spinning, wet, dry or dry after wet spinning, after washing, drying, drawing and heat setting made of polyacrylonitrile fiber.
The following is the preoxidation process, which is a preparatory stage for the carbonization of fiber. First of all, polyacrylonitrile fiber should be treated in low temperature or other oxidation environment at low temperature (i.e. pre oxidation treatment), so that the polyacrylonitrile fiber can be heated directly without melting and flammability, so as to maintain its original fiber state. Then, the fibers are heated in the air for a period of time. After polyacrylonitrile polymers are heated and oxidized, a series of chemical reactions occur, and the color changes. Finally, black pre oxidized fibers are formed. Then the preoxidized fiber is treated with high temperature (carbonization) in nitrogen, then a series of reactions occur, and carbon fibers are formed at the end.
Carbon fiber has a series of unique advantages, such as high specific strength, high specific modulus, high temperature resistance and strong design, etc. the products made by this technology have also been widely applied.
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