| 摘要 |
PURPOSE:To obtain PVA based fibers having excellent tensile strength, elastic modulus and hot water resistance, by spinning a high-molecular weight PVA based polymer solution, drawing the resultant coagulated yarn at a high draw ratio and acetalizing the drawn yarn at a specific stretching ratio. CONSTITUTION:A solution of a PVA based polymer having at least 2500 polymerization degree is spun by a dry jet-wet spinning or gel spinning method. The resultant coagulated yarn is drawn at a draw ratio of at least 15 and then subjected to acetalization treatment at -10-7% stretching ratio so that the acetalization degree may be 5-15mol%. Thereby the aimed fibers having >=18g/d tensile strength, >=250g/d elastic modulus and >=120 deg.C hot water resistance are obtained.
|
