HEAT-AND CHEMICAL-RESISTANT ACRYLIC SHORT FIBERS WITHOUT SPINNING

摘要

A new, pulp-like, acrylic short fiber having excellent heat- and chemical-resistance is provided. The fiber has a thickness distribution of 0.1 mu m to 50 mu m, a length distribution of 1 mm to 20 mm, and a thermal transition temperature (Tg) of above 200 DEG C. The fiber is produced by heating a mixture of polyacrylonitrile and water of about 5% to 100% by weight to temperatures above hydration-melting temperature under seal to an amorphous melt; cooling the resulting amorphous melt to temperatures between the melting and the solidifying temperatures of the melt to form a supercooled melt; extruding the resulting supercooled melt to give extrudates; heat-stabilizing the resulting extrudates at temperatures between 180 DEG C. and 300 DEG C. for 1 minute to 4 hours after drying and drawing; and cutting and beating the resulting heat-stabilized extrudates into an appropriate size.