Preparation method for copolymerization modification aramid 1313 fiber

Abstract

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.

Description

technical field [0001] The invention belongs to the technical field of spinning fibers, and in particular relates to a preparation method of copolymerized modified aramid fiber 1313. Background technique [0002] Aramid 1313 fiber has excellent high temperature resistance and flame retardant properties, good spinnability and dimensional stability, and good mechanical properties. It is currently the most mature and widely used essential flame retardant fiber. No. 2 for specialty fibers. Since there is no polar group in the molecular structure of aramid fiber 1313, the binding force between the molecules of aramid fiber 1313 and between the molecules of aramid fiber 1313 and other molecules is poor, resulting in the problem of poor wettability of the aramid fiber 1313 fiber with the matrix resin during use. , it is necessary to modify the surface of aramid 1313 fiber to improve its performance. [0003] Chinese patent application CN201010108492.8 provides a method of fluorin...

AI Technical Summary

Problems solved by technology

These modification methods are mainly aimed at aramid Ⅲ fiber and para-aramid fiber, and rarely involve the modification of aramid 1313 fiber, and all of them are reprocessing of finished fiber, which increases the process flow, cumbersome operation and high process cost

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