Acrylic fiber physical properties and production of high-tenacity acrylic fibers

摘要

The polymerization in Acrylic Ⅱ factory of Polyacryl Company in Isfahan/Iran is based on solution polymerization with dimethylfor-mamide (DMF) as solvent. Acrylonitrile and vinyl acetate are used as co-monomers in a wet spinning process. The mechanism of PAN fiber formation by the wet-spinning technique is quite complex and involves a combination of rheological and diffusion phenomena. In summary, wet spinning involves passing the polymer from spinneret and coagulation batch, washing, stretching drying crimping and handling to the final product and packaged on tow or staple. Fig. 1 shows the schematic of the process by wet-spinning. One of the most important parameters to determine the PAN fibers quality which is a basic customer demand in the textile industry, is tenacity. In a steady massive industrial fiber production process with serious limitations, tenacity control is an obstacle. Changing the operating condition in the spinning area could improve the tenacity of fibers and provide the customer quality demanded.