Method for preparing antibacterial composite packaging film

Abstract

The invention discloses a method for preparing an antibacterial composite packaging film and belongs to the technical field of packaging materials. The method comprises the following steps: dissolving titanium tetraisopropoxide into anhydrous ethanol in accordance with that the mass ratio of the titanium tetraisopropoxide to the anhydrous ethanol is 1: 10, and adding hydrochloric acid, of which the mass percent is 80%, into the mixed solution in accordance with that the mass ratio of the hydrochloric acid to the titanium tetraisopropoxide is 2: 10; stirring the solution for 1 hour at the temperature of 30 DEG C to 50 DEG C, and standing the solution for 5 hours so as to precipitate out TiO2 anatase microcrystals; slowly adding zein into a TiO2 nanohydrolyzate in accordance with that the mass ratio of the zein to the titanium tetraisopropoxide is 1: 2 so as to form a mixed solution, adding glycerine, of which the mass is 25% to 40% that of the entire system, into the mixed solution, heating the mixed solution to the temperature of 50 DEG C to 70 DEG C, carrying out continuous stirring for 10 minutes, and carrying out heat preservation for 10 minutes; and pouring the mixed solution on a plastic sheet, and carrying out drying for 20 to 40 minutes at the temperature of 45 DEG C, thereby preparing the film. The antibacterial composite packaging film prepared by the method is natural and pollution-free, has high water resistance, is high in strength and is not prone to damage.

Description

technical field [0001] The invention belongs to the field of packaging materials, and in particular relates to an antibacterial packaging composite film. Background technique [0002] In the prior art, antibacterial packaging refers to adding a certain antibacterial agent to the packaging material, so that the antibacterial component contacts the microorganisms attached to the surface of the packaging material and inhibits their growth, reproduction or directly kills them, thereby prolonging the shelf life of food. active packaging. At present, the use of petroleum-derived plastics and nano-TiO 2 Although the antibacterial composite film produced has good comprehensive properties, it cannot be degraded and does not meet the requirements of green packaging and environmental protection; the use of natural products and nano-TiO 2 The antibacterial composite film produced, due to the water resistance or weak water resistance of the natural product itself, the composite film ma...

AI Technical Summary

Problems solved by technology

At present, the use of petroleum-derived plastics and nano-TiO 2 Although the antibacterial composite film produced has good comprehensive properties, it cannot be degraded and does not meet the requirements of green packaging and environmental protection; the use of natural products and nano-TiO 2 The antibacterial composite film produced, due to the water resistance or weak water resistance of the natural product itself, the composite film made is easy to absorb water from the environment and food when packaging food, resulting in low strength of the film