Technique for drying para-aramid micropowder by recycling inert gas

Abstract

The invention relates to a technique for drying para-aramid micropowder by recycling inert gas, which is characterized by comprising steps as follows: wet para-aramid is added into a micropowder drier; after the wet para-aramid is dispersed and crushed, the dispersed para-aramid powder is carried by inert gas into a classificator on the top of the micropowder drier; the para-aramid powder, which passes through the classificator, enters a bag-type dust remover along with the inert gas, and is filtered, and discharged via a rotary discharger; the para-aramid powder, which does not pass through the classificator, returns into the micropowder drier so as to be dispersed and crushed again; part of the inert gas, which is filtered by the bag-type dust remover, enters a condenser and a demister to be dehumidified and demisted, and is mixed with the other part of the inert gas, which is not dehumidified and demisted, for cyclic use; and the moisture generated by the condenser and demister flows into a liquid seal tank respectively via the bottom of the condenser and the bottom of the demister, so as to be recycled. The invention integrates drying, dispersion, crushing and classification, and successfully solves the problem of nonuniform particle size of the dried aramid polymer on the premise of preventing explosion.

Description

technical field [0001] The invention relates to the field of para-aramid fiber drying, and belongs to an inert gas circulation process integrating drying, dispersing and crushing, in particular to an inert gas circulation para-aramid micro-powder drying process. It is also suitable for drying other flammable and explosive materials. Background technique [0002] Para-aramid fiber (PPTA), known as "ace fiber", is a new type of synthetic fiber with excellent properties such as ultra-high strength, high modulus, high temperature resistance, acid and alkali resistance, and light weight. It has good insulation and Anti-aging performance, used in many fields such as personal protection, rubber products, optical cable reinforcement and composite materials, is also an indispensable new material for national defense construction. [0003] Drying is a key link in the production of para-aramid fibers. Conventional para-aramid fibers are dried using heat conduction drying methods such ...

AI Technical Summary

Problems solved by technology

[0003] Drying is a key link in the production of para-aramid fibers. Conventional para-aramid fibers are dried using heat conduction drying methods such as vacuum paddle dryers and steam tube rotary dryers. The particle size of para-aramid fibers is not adjusted during the drying process. control, the particle size of the aramid polymer after drying is uneven, which seriously affects the dissolution in the subsequent spinning process

The dried polymers are crushed and classified, not only the process is complicated and the energy consumption is high, but also the dried aramid polymers have high strength and are difficult to be broken, so there are technical difficulties

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