| 摘要 |
<p>PURPOSE:To obtain the titled fibers, capable of increasing the dissolving temperature in water, reducing the dissolving temperature in water after the treatment with an alkali, and having improved drying efficiency, by spinning a polyvinyl alcohol (PVA) having introduced carboxyl groups into a coagulation bath of Glauber's salt, treating the resultant fibers in an acidic bath, drying the resultant fibers, and heat-treating the dried fibers. CONSTITUTION:A polyvinyl alcohol (PVA) having 0.02-0.4mol/100g introduced carboxyl groups is dissolved in water to give an aqueous solution, which is then spun into a coagulation bath of Glauber's salt. The resultant fibers are then treated in an acidic bath of 2-6pH, and dried with the stuck Glauber's salt. The dried fibers are further heat-treated at 150 deg.C-the melting point to increase the dissolving temperature in water to 90 deg.C or above. The resultant fibers are washed with water to remove the stuck Glauber's salt, and if necessary an oiling agent is applied thereto. The oiled fibers are dried and treated with an alkali to afford the aimed PVA fibers having <=80 deg.C dissolving temperature in water. EFFECT:The high dissolving temperature in water as high as 90 deg.C or above facilitates the drying in the preparation process, and the removal of the stuck Glauber's salt is possible at 80 deg.C or below in the dissolving and removing step thereof. USE:Binder fibers for nonwoven fabrics, etc.</p> |
