Preparation and application of a composite nanofiber fresh-keeping film

Abstract

The invention discloses a composite nano fiber fresh-keeping film preparation and application thereof. The composite nano fiber fresh-keeping film preparation includes: microwave synthesis of modifiedchitosan, preparation of a spinning solution, composite spinning, and application. The method uses glutaraldehyde to modify chitosan, prepares the modified chitosan, polyoxyethylene, polylactic acid,and a cross-linking agent into the spinning solution, and adopts an electrostatic spinning technology to prepare the composite nano fiber fresh-keeping film. The beneficial effects of the fresh-keeping film are that antibacterial ingredients of the fresh-keeping film can break plasma membranes of harmful microorganisms contacting the antibacterial ingredients, can kill the microorganisms, and achieve an antibacterial fresh-keeping function; the composite nano fiber fresh-keeping film is large in specific surface area, is high in porosity, is excellent in fiber uniformity, and is excellent inmechanical property; the composite nano fiber fresh-keeping film has good water and air permeability, can protect fruits and vegetables from decay due to high temperature, has an excellent mechanicalproperty, is safe, non-toxic, and biodegradable, and is a safe, high-efficiency, and environment-friendly composite nano fiber fresh-keeping film.

Description

technical field [0001] The invention relates to the field of preservative film preparation and application, in particular to the preparation and application of a composite nanofiber preservative film. [0002] technical background [0003] Preservative film usually refers to a kind of film-shaped product with moderate oxygen permeability and moisture impermeability, which can adjust the oxygen content and moisture content around the fresh-keeping products, block the dust in the air, and prolong the fresh-keeping period of food. There are three main types of plastic wrap products currently on the market: polyethylene (PE), polyvinyl chloride (PVC) and polyvinylidene chloride (PVDC) plastic wrap. These three types are polymerized with ethylene extracted from petroleum as the masterbatch. In today's increasingly serious "white pollution", commercially available plastic wraps are not easy to decompose in the environment due to their poor degradability, resulting in poor environme...

AI Technical Summary

Problems solved by technology

[0006] The Chinese invention patent of CN 104974490 B discloses a kind of preservative film, its preparation and application. The inventive method uses aluminum silicate to modify the polylactic acid film, wherein aluminum silicate porous powder is evenly dispersed in the preservative film, and aluminum silicate porous powder The content is 5-15wt.%. The plastic wrap has high water vapor permeability, moderate oxygen permeability and carbon dioxide permeability, and also has ethylene scavenging performance, but the aluminum silicate modified polylactic acid of the inventive method The plastic wrap does not have a sterilizing effect, and cannot kill harmful microorganisms on the surface of fruits and vegetables, so it cannot prevent harmful microorganisms from corrupting fruits and vegetables. In addition, the porous aluminum silicate powder will fall off and enter the fruits and vegetables, and will damage human cells after being absorbed by the human body. The influence of normal metabolism will cause a series of biochemical reactions, such as memory loss, senile dementia, etc. For children, excessive intake of aluminum will seriously affect children's intellectual development, so the aluminum silicate modified polylactic acid cling film has a certain security risks

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