Method for preparing hydrophilic polymerized acrylonitrile fiber

Abstract

The invention relates to the hydrophilic acrylonitrile copolymer fiber and the processing method. The processing method: 1. Process the acrylonitrile copolymer by the aqueous precipitation polymerization. Using the acrylonitrile with the percentage of quality (the same below) is 76%-85% and the vinyl acetate with 9%-10% as monomer, using the Acrylic -2 - Hydroxyl propyl with 5%-15% as potential crosslinker, triggered by the initiator sodium chlorate with 0.2%, reductant it by the reductant sodium sulfite with 0.6%, ph 2+-0.1. the monomer quality is 25%-40% of water quality, we can get Acrylonitrile copolymer after Copolymerization in 1-1.5h. 2. Mix the Acrylonitrile copolymer and the cellulose acetate in the proportion of 85-95:15-5 after dry them. Using N,N-dimethyl acetamide as solvent, preparing the spinning solution with the concentration is 15%-25%, making the acrylonitrile copolymer fiber by the way of wet spinning after vacuum defoaming in 1.5-2h. 3. We can get the hydrophilic acrylonitrile copolymer fiber after this art. The art of this invention is aqueous precipitation polymerization. The art has simple process, and simple adjustments of the hydrolysis conditions, the absorbent of fibers can be easily controlled, and also it has a low cost.

Description

technical field [0001] The invention relates to a chemical fiber manufacturing technology, in particular to a method for preparing a hydrophilic copolymerized acrylonitrile fiber, and the international patent classification number is proposed to be Int.C1 D01M 15 / 00 (2006.01). Background technique [0002] At present, there are two main methods for the preparation of hydrophilic fibers: [0003] 1. Hydrophilic polymer spinning method: For example: American Arco Chemical Technology (ARCO) company uses NaOH to neutralize (neutralization degree 55%) maleic acid-isobutylene copolymer aqueous solution, and obtains fineness by dry spinning It is a method of obtaining a hydrophilic fiber after cross-linking treatment at 180°C for 10 minutes for a primary fiber of 2 to 3 deniers. Its trade name is "Fibersorb ("absorbent fiber")" (Le-Khac, polymer and absorbent fiber , U.S. Patent 5,026,784, 1991.6.25); Sun Yushan of China Academy of Textile Sciences and others have studied a kind o...

AI Technical Summary

Problems solved by technology

On the one hand, the hydrophilic fiber obtained by this method has low water absorption performance, and on the other hand, the coating layer is not washable, and the water absorption rate will gradually decrease during use; for another example, Deo et al. have studied a KMnO 4 -HNO 3 Initiate graft copolymerization of acrylonitrile and cotton fiber, and obtain hydrophilic fiber after hydrolysis (H.T.Deo, V.D.Gotmare, gray cotton grafting acrylonitrile monomer improves its water absorption, Journal of Applied Polymer Science, 1999, 72:887~ 894), but due to the limitation of copolymerization conditions, only a small amount of hydrophilic monomers can be grafted in the polymer, which restricts its water absorption; for another example, Lin Kunhua et al. introduced a kind of commercially available polyacrylonitrile fiber (3.33dtex, 65mm) immersed in a certain concentration of ethylene glycol solution, heated to a certain temperature in an oil bath and kept warm for 40 minutes, then cooled to room temperature, took out the fiber and soaked it in distilled water repeatedly until it was neutral, centrifuged and dried, and vacuum dried. Can obtain the about 2.5% golden fiber of cross-linking degree, the method for making hydrophilic fiber after hydrolysis by NAOH solution, neutralization, drying treatment (Lin Kunhua, Cai Dongmei, a kind of hydrophilic fiber and its making Super Absorbent Paper, Chemical Research and Application 2000, 12(3): 339~342)

However, the preparation process of this method is relatively complicated, and the obtained polyacrylonitrile macromolecules have a small degree of cross-linking. After being fully hydrolyzed, they cannot basically maintain a fibrous shape, lose the physical-mechanical properties of the fibers, and are difficult to effectively use as fiber materials.