Multi-purpose gelatin fiber preparing method based on closed type waterborne polyurethane in-situ cross linking

Abstract

The invention relates to a multi-purpose gelatin fiber preparing method based on closed type waterborne polyurethane in-situ cross linking .The preparing method comprises the steps that firstly, a gelatin aqueous solution and closed type waterborne polyurethane emulsion are mixed evenly, and a spinning solution is obtained; secondly, the spinning solution is spun into gelatin / closed type waterborne polyurethane composite fibers with a dry or wet spinning technology; finally, in the subsequent drying process, closed type waterborne polyurethane is subjected to closed-form solution, isocyanate groups obtained through closed-form solution further react with active groups in gelatin, and thus the effects of in-situ cross linking and great improvement of the mechanical property of the composition fibers are achieved .Due to the fact that waterborne polyurethane and gelatin are in good compatibility, the adding quantity of the gelatin component in the composite fibers is large, and the excellent performance of gelatin is fully embodied; besides, waterborne polyurethane is nontoxic, and the biological compatibility of the composite fibers cannot be influenced after cross-linking modification is performed on gelatin; a covalence reaction exists between waterborne polyurethane and gelatin, the mechanical property of the composition fibers can be greatly improved in a lasting mode, and the composite fibers have application prospects in biomedical, tissue engineering and textile and garment fields and the like .

Description

technical field [0001] The invention relates to a method for preparing a multipurpose gelatin fiber based on in-situ crosslinking of closed water-based polyurethane, which belongs to the field of fiber manufacturing. Background technique [0002] Gelatin is a protein partially hydrolyzed from the collagen in the connective or epidermal tissue of animals. It has good biocompatibility and has a wide range of applications in the fields of medicine and biomaterials. Compared with collagen, gelatin has a wide range of sources, low price, and simple preparation. More importantly, gelatin has high solubility in hot water, and the formed solution has strong spinnability, which can be used in various fields for preparing fibers. potential. However, gelatin has low mechanical strength and usually requires cross-linking modification to improve its mechanical properties (application performance). In general, gelatin can be cross-linked and modified by small molecule crosslinking agent...

AI Technical Summary

Problems solved by technology

However, gelatin has low mechanical strength and usually requires cross-linking modification to improve its mechanical properties (application properties)

In general, gelatin can be cross-linked and modified by small molecule crosslinking agents (such as metal ions, formaldehyde, glutaraldehyde, etc.), but the reaction of small molecule crosslinking agents is not complete, and the residue (higher toxicity) affects gelatin products. deficiencies in biocompatibility

In addition, gelatin can also be blended with other macromolecular materials (such as polyvinyl alcohol, cellulose, etc.) to improve its mechanical properties, but the amount of gelatin added in these macromolecular materials is generally small, which does not fully reflect the gelatin itself. excellent performance; in addition, the interaction between these macromolecular materials and gelatin is low, and there may be a problem of continuous dissolution of gelatin during subsequent use (especially in solution)