Process of producing polyacrylic fiber dyeable with both cationic dye and acid dye

Abstract

A kind of manufacture method of the acrylic fiber that cationic dye and acid dye can be dyed, comprising: polyacrylonitrile resin A and B are dissolved in solvent to make spinning dope, the 3rd monomer of A is sodium methacrylic sulfonate or 2 - Acrylamido-2-methylpropanesulfonic acid, the content is 0.8~5.0wt%, the third monomer of B is methacrylic acid N, N dimethylaminoethyl nitrate, methacrylic acid N, N dimethyl One of amino ethyl ester hydrochloride or N, N dimethylamino ethyl methacrylate sulfate, the content is 3.3-12.5wt%. The weight ratio A:B=1:(0.6~1.6), the total solid of the spinning stock solution is 8~20%, the solvent is NaSCN aqueous solution with a concentration of 35~58wt%; For fibers, the coagulation bath is NaSCN aqueous solution with a concentration of 8-15wt%; the as-spun fibers are processed into acrylic fiber products through post-processing.

Description

technical field [0001] The invention relates to a method for manufacturing acrylic fibers, in particular to a method for manufacturing acrylic fibers by using NaSCN aqueous solution as a solvent wet spinning process. Background technique [0002] Acrylic fiber has good bulkiness and warmth retention, soft hand feeling, performance similar to wool, and excellent light resistance and radiation resistance. Acrylic fiber has a wide range of applications, and is an ideal textile raw material in the fields of clothing, bedding and soft decoration. The spinning raw material of acrylic fiber is polyacrylonitrile resin, and the dyeing performance of pure polyacrylonitrile resin is very poor. Therefore, in addition to adding the second comonomer to improve flexibility, the third comonomer for dyeing modification must also be added to the resin. body to provide dye-topped dye loci to the polymer molecules. In the prior art, the third monomer of common polyacrylonitrile resin is only ...

AI Technical Summary

Problems solved by technology

Although these existing acid dyeable acrylic fibers still have obvious defects, such as the low reactivity ratio in the copolymerization system formed by the third monomer of dyeing modification and acrylonitrile and the second monomer of flexible modification commonly used, As a result, it is easy to cause the dyeing saturation value to fail to reach the ideal value, but after all, the dyeability of acid dyes for acrylic fibers has been achieved.

[0003] However, the existing acrylic fibers only have the ability to be dyed with a single dye, or can be dyed with cationic dyes or acid dyes, and cannot be dyed with both dyes.

This obviously increases the difficulty in the production and management of acrylic fiber product sales management, subsequent textile processing and dyeing and finishing processes.