TREATMENT OF ACRYLIC FIBER

摘要

PROBLEM TO BE SOLVED: To efficiently carry out the weight reduction treatment of an acrylic fiber without adversely affecting the dyeability or touch feeling by hydrolyzing nitrile groups of the acrylic fiber and removing a carboxyl group-containing polymer remaining in the fiber. SOLUTION: Nitrile groups of an acrylic fiber which is a single fiber comprising a polymer containing 60-100wt.% bonded acrylonitrile or used in a mixture thereof with other fibers are hydrolyzed with a 1-35wt.% aqueous solution of an alkali metallic hydroxide or a 55-65wt.% aqueous solution of sulfuric acid to elute the surface of the fiber as a water-soluble polymer. A carboxyl group-containing polymer remaining in the fiber is then removed by treatment with an oxidizing agent using sodium hypochlorite or hydrogen peroxide to treat the acrylic fiber.