Method for cleanly preparing bioplastic food packaging film at low cost

Abstract

The invention belongs to the technical field of preparation of packaging films and provides a method for cleanly preparing a bioplastic food packaging film at low cost. The method comprises the following steps: preparing modified cellulose by utilizing hydrogen bonds of ultra ultraviolet radiation high-energy bombardment destroyed cellulose in a vacuum environment, wherein the modified cellulose has a good thermoplastic property; matching polylactic acid, gallic acid and glycerol for calendaring to obtain a prototype film; further melting polyadipic acid-butylene terephthalate and polycarbonate into slurry and coating the surface of the prototype film with the slurry; carrying out rolling, stretching and shaping, thus obtaining a food packaging film. The packaging film prepared by the method has the advantages of stretch resistance, barrier property and good contacting safety with food; in addition, the method has the advantages of simple technological operation in the whole process, high production efficiency, low production cost and capability of realizing batch production.

Description

technical field [0001] The invention belongs to the technical field of packaging film preparation and provides a low-cost and clean method for preparing bioplastic food packaging film. Background technique [0002] With the advancement of science and technology and the improvement of people's consumption level, food packaging is becoming more and more important in people's lives. Fresh-keeping, environmental protection and convenience are the new fashions in the development of food packaging. The choice of packaging should not only take into account the requirements of food packaging, the wishes of consumers and the needs of manufacturers, but also the coordination and unification of products, packaging and the environment. [0003] The current food packaging materials have achieved good development in terms of functionality, environmental protection and aesthetics. Because food packaging films have excellent performance in efficiently protecting food safety, and at the same...

AI Technical Summary

Problems solved by technology

Among them, Li Zhe invented a method for preparing cellulose film for food packaging (China Invention Patent Application No. 201610540555.4), which includes the following steps: preparing modified nano-vermiculite powder and preparing cellulose film. The process steps are simple and will not pollute the environment. The production process Short, the whole process is mild, and the formula of the film-forming liquid is optimized and improved at the same time. The thickness of the prepared cellulose film for food packaging is uniform and the product performance is excellent. However, this method fails to solve the problem of poor thermoplasticity caused by the high crystallinity of cellulose molecules. Problems that are difficult to completely degrade

In addition, Chinese Invention Patent Application No. 201510555850.2 discloses a method for preparing methylcellulose-lipid packaging film. The steps include: (1) Weighing methylcellulose, adding hot ethanol aqueous solution, adding plasticizer after fully dissolving (2) After the mixed film liquid is co-treated with microwave and ultrasonic waves, it is cast into a film, dried, and the film is peeled off to obtain a food packaging film, but this method is not thorough enough for the treatment of cellulose , and have a certain impact on food safety due to the addition of plasticizers

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