Preparation method of chitosan/titanium dioxide sol antibacterialpackaging film

Abstract

The invention relates to a method for preparing anenvironment-friendlyhigh polymer material antibacterialpackaging film by mixing chitosan and titanium dioxide sol, and belongs to the technical field of preparation of a novel high polymer material taking renewablebiomass as a raw material. Tetrabutyltitanate, glacial acetic acid and a silane coupling agent (KH570) are slowly dropped in absolute ethyl alcohol respectively and stirred to prepare a precursor, deionized water and hydrochloric acid are sufficiently stirred and dropped in the absolute ethyl alcohol, a dropping liquid is prepared and then dropped in the precursor at a certain speed, modified titanium dioxide sol is obtained, added to a chitosan-acetic acid solution containing glycerin and uniformly stirred, and the chitosan / titanium dioxide sol antibacterialpackaging film is obtained after defoaming and film scraping. According to the preparation method, the titanium dioxide sol reaction temperature is low, the equipment investment is small, and uniform doping of the titanium dioxide sol and a chitosan solution in the molecular level can be realized in shorter time; and the compatibility of the titanium dioxide sol treated by the silanecoupling agentand chitosan is good.

Description

technical field [0001] The invention relates to a method for manufacturing an antibacterial packaging film by mixing chitosan, an environment-friendly polymer material, and titanium dioxide sol, and belongs to the technical field of preparing new polymer materials with renewable biomass as raw materials. Background technique [0002] The surface of the packaging film for packaging dairy products, fruits and vegetables, meat and other nutrient-rich items is rich in nutrients, and the general storage temperature, humidity and other conditions are also more suitable for the growth of microorganisms. The surface of the packaging film is easily contaminated with microorganisms, and the microorganisms can easily migrate to the articles. cause items to rot. If antibacterial materials are used to prepare packaging films, the growth of microorganisms can be inhibited and the reproduction of microorganisms on the surface of packaging materials can be prevented, thereby further prevent...

AI Technical Summary

Problems solved by technology

[0005] Wen Yan, Han Jianbing and others used nano-TiO 2 Preparation of chitosan / nano-TiO with broad-spectrum antibacterial properties and photocatalytic activity 2 Composite antibacterial materials, but this research uses nano-TiO 2 Powder and chitosan solution are directly blended to prepare composite materials, because nanoparticles are easy to agglomerate, resulting in phase separation

Pang Hongtao and others used hydrothermal method to prepare nano-TiO 2 / Chitosan composite material, but this method must be carried out under high temperature and high pressure during reaction, so the reaction equipment requires high requirements, technical difficulty is large, and safety is also poor