STUDIES ON THE PRODUCTION OF ACRYLIC FIBER BY WET SPINNING

Abstract

Co-polymer composed of AN 95% and methyl acrylate 5% was dissolved into NaCNS aqueous solution of 50% concentration. This dope solution was extruded in NaCNS aqueous solution of 10% concentration at the temperature levels of 0°C, 10°C, and 20°C, and with the spinning velocity of 30_??_50m/min. Coagulated yarn thus obtained was processed through water washing, and then hot-water stretching.Tensile properties of the coagulated yarn and the final fiber were measured at each process.1. The lower the temperature of the coagulation bath is, the higher the tensile strength and the resistant energy or rupture (tensile strength elongation) of the yarn in the coagulation on process and also in the following the yarn washing and hot stretching processes. The same tendency is noticed in the tensile strength of the final fiber.2. When the temperature of coagulation bath was 0°C, the strength of yarn which went through the coagulation bath, washing bath and hot stretch bath was 0.21g/d, 0.32g/d, and 3.30g/d, respectively.3. The increasing ratios of the strength at each processes were almost constant independent on the temperature of coagulation bath in the range of 0°C_??_20°C, except for one case.4. No influence of the temperature of washing water on the tensile properties of the final fiber is observed in the temperature range from 10°C to 30°C.5. when the coagulated yarn in the gel state is stretched to increase the eveness of coagulation, about two-times stretch is desirable from the view point of moleculhr sliding by stretching.6. The coagulation at 0°C and stretching about 10 times in boiling water resulted the favourable tensile properties of final yarn such as tensile strength 3-4g/d, knot strength about 2.8g/d, and elongation about 30%. If glycerin aqueous solution is used in hot stretch process, 14 times stretch is feasible at 130°C.