The invention provides a preparation method for a copolymerization modification
aramid 1313
fiber. The preparation method includes the following steps that m-phenylenediamine and
aromatic diamine withpolar groups are dissolved in a
amide solvent, and a
mixed solution is frozen and cooled and then subjected to a mixed reaction with a fused
isophthaloyl dichloride in a low-temperature environment,so that a copolymerization modification
aramid solution is obtained; a neutralizing agent is adopted for neutralizing and conducting
impurity removal on the copolymerization modification
aramid solution, so that a
spinning stock solution is obtained; the
spinning stock solution is subjected to vacuum defoaming and filtering and then enters a first-stage coagulating bath through a spinneret plate,and then through a second-stage coagulating bath, hot water drafting, washing,
drying, oil applying,
dry heat stretching,
heat setting, cooling oil applying and rolling, the copolymerization modification aramid 1313
fiber is obtained. Through the method, the surface polarity of the
fiber is optimized basically, a complex technological process that after the fiber is made, the surface of the fiberis modified is avoided, and production efficiency is improved; meanwhile, technological costs are low, operation is easy, safe and
environmentally friendly, and the fiber is suitable for large-scale production.