| 摘要 |
PURPOSE:To obtain acrylic yarn having high strength and high modulus of elasticity and improved high-temperature wet heat characteristics, by subjecting a solution of acrylic polymer to spinning. drawing, washing with water, drawing further in boiling water, etc., and followed by drying, drawing and heat treatment under specific conditions, respectively. CONSTITUTION:A solution of an acrylic polymer consisting of 90-100wt% acrylonitrile and 0-10wt% vinyl monomer [e.g., (meth)acrylic acid methyl, etc.] is used as a spinning stock solution and it is subjected to wet spinning, dry and wet spinning or dry spinning. Then, the yarn is drawn, washed with water, drawn in boiling water or in steam and dried until the drawn yarn has 5-60wt% water content. The yarn is then drawn at 1:1-1:3.0 draw ratio at 120-200 deg.C, further heat-treated at 180-300 deg.C under tension to give the aimed yarn having >=6g/d strength, >=80g/d initial modulus of elasticity and >=60% strength retention ratio and >=60% retention ratio of modulus of elasticity after wet treatment in an alkali aqueous solution at 9-13pH at 180 deg.C for 8hr.
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