| 摘要 |
PURPOSE:To obtain polyamide fiber, film and sheet with high water absorption and water retention by dissolving a polyamide in an amide solvent by heating, molding it and removing the solvent after cooling and gelation. CONSTITUTION:A polyamide is dissolved in an amide solvent along optionally contg. an inorg. salt by heating and the soln. is extruded from a spinneret or cast on a plane. After cooling and gelation, the solvent and the salt are removed in one or more steps. The mol.wt. of the polyamide used is usually approximately 15,000-500,000. Examples of the amide solvent include N-methyl-2- pyrrolidone and N,N-dimenthylacetamide. As the inorg. salt, lithium chloride and calcium chloride are used. The water absorbing polyamide fiber, film and sheet mostly exhibit a water absorption of approximately 1,200-1,500% and a water retention after centrifugal dehydration of about 800% which depend a little on the manufacturing conditions. |
