Method for preparing ultrafine polysulfonainide fiber

Abstract

The invention provides a method for preparing ultrafine polysulfonainide fiber. The method comprises the following steps: dissolving the polyphenylene sulfone terephthaloyl amide master batch prepared by a conventional method in a strong polar solvent to form 11 to 25 percent spinning solution; stirring the spinning solution for 30 to 90 minutes at a high speed and filtering the spinning solution; heating the spinning solution to a temperature of between 40 and 150 DEG C till regular vacuole occurs in the spinning solution; performing rapid pressurization on the spinning solution in a solution storage pool through an air duct; acting on the heated spinning solution by utilizing a metal electrode; after electric field force exceeds the surface tension of the spinning solution, forming mass injection streams on the top end of the vacuole; and subsequently, rapidly stretching and differentiating the injection streams to obtain the ultrafine polysulfonainide fiber. When the method is used to prepare polysulfonainide yarn, the production speed can reach between 50 and 200m/min, and the diameter of the polysulfonainide fiber is between 0.6 and 2.2 mu m and is only 1/8 to 1/10 of that of traditional polysulfonainide.

Description

technical field [0001] The preparation method of the polysulfone fiber of the present invention particularly relates to a preparation method of the superfine polysulfone fiber. Background technique [0002] The production route of traditional aramid sulfone fiber is as follows: figure 1 As shown, the manufacturing process is as follows: polycondensation reaction is carried out first, 3,3'-diaminodiphenylsulfone and 4,4'-diaminodiphenylsulfone are dissolved in dimethylacetamide, and then terephthalylene Acyl chlorides are subjected to low-temperature solution polycondensation to obtain a polysulfone amide polymerization solution with a relative viscosity ≥ 1.6, with a volume concentration of about 13%, and then spinning: neutralize the above solution with calcium chloride, filter, and perform wet spinning after defoaming. It is an aqueous solution of dimethylacetamide-calcium chloride, washed with water, dried and stretched to obtain filaments. If short fibers are produced,...

AI Technical Summary

Problems solved by technology

[0003] The production process of the traditional wet spinning method to prepare polysulfone fiber is complex and the spinning speed is slow, which limits the production of polysulfone fiber, and the linear density of the polysulfone fiber obtained by the traditional wet spinning process is 1.67dtex, and the diameter exceeds 17um

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