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Abstract

The present disclosure provides a method and a device for preparing a modified poly (m-phenylene isophthalamide) (PMIA) fiber by continuous polymerization-dry-wet spinning. The method includes the following steps: (1) preparing a mixed solution of m-phenylenediamine (MPD) and a copolymerized diamine monomer in N,N-dimethylacetamide (DMAC) serving as a solvent using a cosolvent; (2) mixing isophthaloyl chloride (IPC) with the mixed solution of the MPD and the copolymerized diamine monomer in the DMAC, and conducting pre-polycondensation and polycondensation in sequence to obtain a modified PMIA resin solution; and (3) subjecting the modified PMIA resin solution to additive addition, filtration, defoaming, and dry-wet spinning to obtain the modified PMIA fiber. In the device for preparing a modified PMIA fiber by continuous polymerization-dry-wet spinning, a prepolymerization system includes a micro-mixer and a micro-reactor that are connected in sequence, and a micro-channel of the micro-reactor is designed to be heart-shaped; and a polycondensation system is a combination of multi-stage micro-screws. The present disclosure comprehensively solves the problems during preparation of the PMIA fiber. Moreover, an obtained product has a perfect structure, excellent performances, and desirable stability and controllability, and can be prepared through continuous high-efficiency production.

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