Preparation method of fiber with high water absorption

Abstract

The invention relates to a preparation method of a fiber with high water absorption, which is a method for preparing the fiber with high water absorption by a post-crosslinking agent. According to the preparation method, the fiber with high water absorption is prepared from acrylic acid (AA) and acrylamide (AM) which are partly neutralized and taken as polymerized monomers through the steps of: blending the polymerized monomers with polyving akohol (PVA), initiating by potassium persulfate (KPS), blending and polymerizing in an aqueous solution, adding a dialdehyde solution to obtain a mixed solution serving as a post-crosslinking agent solution, mixing to be uniform and defoaming to obtain a spinning stock solution; dry-wet spinning the spinning stock solution to form a nascent fiber; and heat-treating the nascent fiber at a certain temperature to generate a crosslinking reaction, thereby forming the three-dimensional net-structured fiber with high water absorption. According to the preparation method, the implosion phenomenon which easily occurs during polymerization of the traditional polymer solution with high water absorption is avoided, the preparation technology is simple and safe, the production cost is reduced, and the production efficiency is increased; and the obtained water-absorbing fiber has high and controllable water adsorption, thermostability, capability of being repeatedly used, and long residual action.

Description

technical field [0001] The present invention relates to a preparation method of superabsorbent fiber, in particular to a preparation method of post-crosslinked superabsorbent fiber, specifically a dry-wet spinning preparation method of post-crosslinked superabsorbent fiber . Background technique [0002] Superabsorbent fiber is a special functional fiber developed after superabsorbent resin, which is the extension and expansion of superabsorbent resin. Due to the many advantages of super absorbent fiber, the research on super absorbent fiber at home and abroad is very active. At present, the main producers of super absorbent fibers are Canada, Japan, the United States, the United Kingdom, Germany, etc., while the domestic start is relatively late, but it has also shown a rapid development trend in recent years. [0003] The "Bell Oasis" fiber developed by British Technical Absorbents and co-produced with Japan Bell Spinning Co., Ltd. is made of aqueous solution polymerizat...

AI Technical Summary

Problems solved by technology

[0007] Although the above prior art uses partially neutralized acrylic acid and acrylamide mixed with polyvinyl alcohol to prepare superabsorbent fibers, in fact, the addition of crosslinking agents before polymerization will aggravate the self-acceleration during polymerization. When the bulk polymerization enters a self-accelerating state, the viscosity in the polymerization system increases instantaneously, and the generated polymerization heat is easy to accumulate and finally leads to sudden polymerization.

Although some latent crosslinking agents are used for post-crosslinking, but only a part of post-crosslinking, the crosslinking agent will still react during polymerization, it is difficult to control the degree of crosslinking, making the copolymerization blend solution unstable, and ultimately affecting high water absorption The performance stability of the fiber, the water absorption performance of the obtained superabsorbent fiber is not high enough, and cannot meet the requirements of some blended fabrics and medical dressings that require high water absorption.

In addition, the as-spun fiber does not form a cross-linked structure, and its mechanical properties are poor. When wet spinning is used to prepare super absorbent fibers, it is easy to break fibers, which affects production efficiency.