Composite fibre of chitin or derivative thereof and polyvinyl alcohol and manufacturing method thereof

Abstract

The invention relates to a composite fibre of chitin or a derivative thereof and polyvinyl alcohol and a manufacturing method thereof. The method comprises the following steps of: taking polyvinyl alcohol spinning solution as a core layer and chitin derivative spinning solution or blended spinning solution of the chitin derivative and the polyvinyl alcohol as a sheath layer; extruding the solution from a sheath-core composite spinning component; and moulding the extruded composite solution flow by dry spinning to form chitin derivative / polyvinyl alcohol sheath-core composite fibre; or removing butyryl group from the obtained chitin derivative / polyvinyl alcohol sheath-core composite fibre to obtain chitin / polyvinyl alcohol sheath-core composite fibre, wherein the chitin derivative is succinyl chitin. The method has high production operability, high safety and simple process and is suitable for mass production. The prepared composite fibre has superior physical and mechanical properties, superior dyeing property, distinct style of the biologic fibre, various biologic health care and medical care functions and low production cost.

Description

technical field [0001] The present invention relates to a functional fiber material - a composite fiber of chitin or its derivatives and polyvinyl alcohol and their manufacturing method, in more detail, about the chitin or its derivatives with a skin-core structure and polyvinyl alcohol Conjugated fibers of vinyl alcohol and methods for their production. 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...

AI Technical Summary

Problems solved by technology

[0007] But, there is following shortcoming in the method that these derivatives chitosan and polyvinyl alcohol compound manufacture fiber with chitin: chitosan has low solubility in acetic acid aqueous solution, generally lower than 10wt because there is strong hydrogen bond in molecule and intermolecular %, when the content of chitosan in the fiber was higher, because the spinning stock solution with higher concentration of the polymer could not be prepared, the production efficiency was low and the cost was high, and it was more difficult to make the composite fiber with the content of chitosan higher than 80wt%; Due to strong hydrogen bonding, the viscosity of acetic acid aqueous solution of chitosan is very high, and the spinnability of the stock solution is poor; due to the presence of acetic acid in the spinning stock solution, acetic acid will pollute the coagulation bath when it is formed by wet method or dry-wet method. When the sodium aqueous solution is the coagulation bath, acetic acid and sodium hydroxide undergo a neutralization reaction to generate sodium acetate and strongly exothermic, which not only pollutes the coagulation bath, but also affects the concentration and temperature of the coagulation bath, thereby affecting the coagulation of polyvinyl alcohol; Metal is highly corrosive. When using acetic acid aqueous solution as a solvent, the anti-corrosion problem of production equipment must be considered; acetic acid, for example, is strongly irritating to human skin and mucous membranes, so it is not safe to use acetic acid aqueous solution as a solvent.

But the prepared dibutyryl chitin fiber has low strength, which is not only difficult to meet the requirements of post-spinning processing, but also unfavorable for spinning operation and further debutyrylation treatment operation when preparing chitin fiber, which is easy to produce broken filaments; The cost of pure dibutyryl chitin and chitin fibers is higher