Blend fiber of chitin or derivative thereof and polyvinyl alcohol and manufacture method thereof

Abstract

The invention relates to a blend fiber of chitin or a derivative thereof and polyvinyl alcohol and a manufacture method thereof. The fiber is the blend fiber of dibutyryl chitin and polyvinyl alcohol. The weight percentage content of the polyvinyl alcohol in the blend fiber is 5-95 percent, preferably 20-80 percent, more preferably 40-80 percent; the balance is the dibutyryl chitin, or, butyryl-removing treatment is further carried out on the blend fiber of the dibutyryl chitin and the polyvinyl alcohol to obtain the blend fiber of the chitin and the polyvinyl alcohol. The method comprises the following steps: mixing the spinning solution of the dibutyryl chitin with the spinning solution of the polyvinyl alcohol; extruding the mixed spinning solution from a spinning assembly, shaping by dry spinning; then carrying out dry heat stretching to obtain the blend fiber of the dibutyryl chitin / the polyvinyl alcohol, or further carrying out the butyryl-removing treatment on the blend fiber of the dibutyryl chitin / the polyvinyl alcohol to obtain the blend fiber of the chitin / the polyvinyl alcohol. The blend fiber has high strength, good method operability and simple process.

Description

technical field [0001] The invention relates to a functional fiber material—a blend fiber of chitin or its derivatives / polyvinyl alcohol and a manufacturing method thereof. Background technique [0002] Chitin is a natural biopolymer extracted from shells of shrimps, crabs, insects, and cell walls of fungi and algae. In nature, the annual biosynthesis of chitin is more than 10 billion tons, and it is an organic renewable resource with abundant reserves second only to cellulose. Chitin and its derivatives such as chitosan (the product of deacetylation of chitin after concentrated alkali treatment), etc., have many specific biological functions, such as high biocompatibility, biodegradable absorbability, broad-spectrum antibacterial properties , Immunopromoting activity, promoting wound healing and reducing scar performance, etc. [0003] Existing technologies use chitin or its derivatives such as chitosan solution to spin into fibers, which are used for medical purposes suc...

AI Technical Summary

Problems solved by technology

[0007] However, the manufacturing methods of these skin-core fibers or blended fibers composited with chitin derivatives chitosan and polyvinyl alcohol have the following disadvantages: chitosan has strong hydrogen bonds in the molecule and between molecules, and its The solubility is low, generally lower than 10wt%. When the content of chitosan in the fiber is higher, the spinning stock solution with higher polymer concentration cannot be prepared, the production efficiency is low, the cost is high, and it is more difficult to make the content of chitosan higher than 80wt% composite fiber; due to strong hydrogen bonding, the acetic acid aqueous solution of chitosan has a very high viscosity, and its stock solution has poor spinnability; due to the presence of acetic acid in the spinning stock solution, acetic acid will pollute the coagulation bath during wet forming, especially When the sodium hydroxide aqueous solution is used as the coagulation bath, acetic acid and sodium hydroxide undergo a neutralization reaction to form sodium acetate and generate heat, which not only pollutes the coagulation bath, but also affects the concentration and temperature of the coagulation bath, thus affecting the coagulation of polyvinyl alcohol ; Acetic acid has stronger corrosivity to metal, when making solvent with acetic acid aqueous solution, must consider the anticorrosion problem of production equipment;

However, the resulting chitin fibers still lack sufficient strength for post-textile processing

In addition, the cost of this pure dibutyryl chitin and chitin fiber is also high