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

Abstract

The process of producing polyacrylic fiber dyeable with both cationic dye and acid dye includes dissolving polyacrylonitrile resin A and polyacrylonitrile resin B in the weight ratio of 1 to (0.6-1.6) in solvent of water solution of NaSCN in the 35- 58 wt% concentration to form raw spinning liquor with total solid content of 8-20 %; spinning the raw spinning liquor through the 8-15 wt% concentration water solution of NaSCN inside the coagulating bath to form nascent fiber; and post-treatment of the nascent fiber to produce polyacrylic fiber product. The third monomer for resin A is sodium methyl acryl sulfonate or 2-acrylamido-2-methyl propyl sulfonic acid and accounts for 0.8-5.0 wt%; and that for resin B is one of N, N-dimethyl amido ethyl methyl acrylate nitrate, N-dimethyl amido ethyl methyl acrylate hydrochloride or N-dimethyl amido ethyl methyl acrylate sulfate and accounts for 3.3-12.5 wt%.

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.