Silver-carried chitosan high-strength antibacterial material and preparation method thereof

Abstract

The invention discloses a silver-carried chitosan high-strength antibacterial material and a preparation method thereof. The silver-carried chitosan high-strength antibacterial material is prepared through the steps that chitosan is dissolved at a low temperature, low-temperature regeneration is conducted, chitosan hydrogel composed of a nanofiber network is obtained and services as base material,and nanosilver elements are uniformly loaded on the fiber network of the base material; the silver elements are obtained through reduction of an amino group on large specific surface area chitosan nanofiber, and plays a role of cross-linking antibiosis and antibiosis to enhance the mechanics. The regenerated chitosan nanofiber network hydrogel has the very large specific surface area and the fully exposed amino group, the silver element are prepared by means of amino reduction, a chemical reducing agent is not needed, and pollution is reduced. Nano silver particles on a silver-carried chitosan high-strength antibacterial film prepared through the method are small in size and uniform in dispersion, and by means of the cross-linking action of silver and the amino group, the film strength isimproved, so that the film is high in mechanical strength and resistant to stretching and tear. The material has broad application prospects in the industries of antibacterial wound dressings, food packaging and the like.

Description

technical field [0001] The invention relates to a chitosan silver-loaded high-strength antibacterial material and a preparation method thereof, belonging to the field of preparation of antibacterial materials. Background technique [0002] Chitin widely exists in higher fungi, arthropod shrimp, crab, insect shells and other organisms in nature. As a natural polysaccharide, it has a considerable reserve on the earth, and the annual synthesis amount in nature is more than 1 billion tons. It is the second largest biological resource after cellulose in nature. Chitin has high biocompatibility and biodegradability, and is often used as an important class of biomedical materials. Chitosan can be obtained through deacetylation. Chitosan has antibacterial properties, biodegradability, and biocompatibility, and chitosan films are used in food preservation films, wound dressings, cell scaffolds, etc. Because the mechanical strength of the pure chitosan membrane material prepared by ...

AI Technical Summary

Problems solved by technology

The present invention solves the problem of weak mechanical strength of chitosan hydrogel and membrane by adopting alkali-dissolution low-temperature dissolution and regeneration method conveniently and quickly, and the regenerated chitosan nanofiber network hydrogel has super large specific surface area and fully exposed Amino groups, the use of amino group reduction to prepare silver simple substances, eliminating the use of reducing agents, and the cross-linking of silver and amino groups further improves the film strength

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