Preparation method of para-aramid low-denier fiber filament

Abstract

The invention relates to a preparation method of a para-aramid low-denier fiber filament, belongs to the technical field of chemical fiber spinning, and particularly relates to a preparation method of a para-aramid low-denier (25-100D) fiber filament. The problem of wire breaking needs to be solved in the spinning process of the para-aramid low-denier fiber filament to ensure the production stability and the tow performance stability. According to the preparation method of the para-aramid low-denier fiber filament, a selected spinneret cap is used for reducing the risk of extruded cross flow and doubling of a para spinning solution; an alkali liquor with proper concentration is used for washing primary tows, thereby quickly neutralizing sulfuric acid and improving the strength of the tows; and by adopting flat washing and drying modes, the risk of wire breaking in the washing and drying links is reduced. By using the method, the spinning process of the para-aramid low-denier filament is stable and easy to operate, and the obtained fiber is excellent in mechanical property and stable in quality.

Description

technical field

[0001] The invention relates to a method for preparing para-aramid low-denier fiber filaments, and belongs to the technical field of chemical fiber spinning. Background technique

[0002] Para-aramid fiber is a high-performance material with excellent properties such as high strength and high modulus, high temperature resistance, acid and alkali resistance, and light weight. It is widely used in national defense, aerospace, and many civilian fields. The common preparation process of para-aramid fiber includes dope preparation and spinning. The stock solution is prepared by dissolving poly-p-phenylene terephthalamide (PPTA), the resin used for spinning, in concentrated sulfuric acid, then continuously filtering and defoaming online, and finally transporting it to the spinning system by a booster pump for metered spinning. The principle of para-aramid fiber spinning is dry jet wet spinning. That is, the precisely metered spinning dope is compressed and extrud...