Method for preparing contraposition aramid fiber dissolving pulp from contraposition aramid fiber waste silk chopped fiber

Abstract

The invention discloses a method for preparing p-phenylene terephalamide pulp from short cut p-phenylene terephalamide waste fibers through pre-treatment and combined beating. The method comprises: pretreating the short cut p-phenylene terephalamide waste fibers with a 2 to 50 percent swelling agent at 20 to 60 DEG C for 1 to 24 hours first, wherein the bath ratio is (5-50):1; and then subjectingthe pretreated short cut p-phenylene terephalamide waste fibers to body fluid exhaustion and washing, preparing a suspension of fibers with a pulp mass concentration of 0.25 to 3 percent with the short cut p-phenylene terephalamide waste fibers, and beating by a two-stage combined bearing process of a trough-style pulp beater to obtain the p-phenylene terephalamide pulp. The method is characterized by taking the short cut p-phenylene terephalamide waste fibers as a raw material, using the swelling agent to pretreat the short cut p-phenylene terephalamide waste fibers, preparing the p-phenylene terephalamide pulp by the two-stage beating process, shortening time for beating, improving the added value of p-phenylene terephalamide waste fibers and preparing the p-phenylene terephalamide pulpwith excellent performance.

Description

Method for preparing para-aramid pulp from para-aramid waste chopped fibers technical field The invention belongs to the field of polymer technology and papermaking technology, and in particular relates to a method for preparing para-aramid pulp from para-aramid waste chopped chopped fibers through a pretreatment-combined beating two-step method. Background technique Para-aramid is a high-performance fiber variety developed by DuPont in the United States in the 1970s. It has excellent physical and mechanical properties, thermal oxygen stability, flame retardancy and excellent electrical properties. Ace material". As a high-performance fiber material, para-aramid can not only be used as various structural materials and functional materials, but also can be used in combination with other materials, and is widely used in aerospace, national defense, friction, sealing, reinforcement materials and other fields. Applications. At present, the production technology of para-arami...

AI Technical Summary

Problems solved by technology

Aiming at the problem of comprehensive utilization of para-aramid fiber waste, the present invention provides an effective, simple and easy-to-operate method, a new method for producing para-aramid pulp from para-aramid waste silk

Images