Degradable high-barrier composite material and preparation method thereof

Abstract

The invention discloses a degradable high-barrier composite material and a preparation method thereof. The preparation method of the composite material comprises the following steps: dissolving 6.0 gof tapioca starch in 100 ml of distilled water, and keeping in a water bath at 80 DEG C for stirring in for 30 min to obtain a tapioca starch solution; dissolving 9.0 g of polyvinyl alcohol in 100 mlof distilled water, and keeping in a water bath at 95 DEG C for stirring for 30 min to obtain a polyvinyl alcohol solution; dissolving 3.0 g of chitosan in 100 ml of a 5% acetic acid solution, and ultrasonically dispersing in an ultrasonic cleaner for 30 min to obtain a chitosan solution; adding the polyvinyl alcohol solution and the chitosan solution to the tapioca starch solution, adding 10mL ofan absolute ethanol solution for defoaming treatment, adjusting the pH of the solution to 4.0, stirring in a water bath at 90 DEG C for 30 min, adding a certain amount of plasticizer and cross-linking agent, after the stirring reaction is finished, performing vaccum degassing on a film solution, and finishing the vaccum degassing until no bubble is produced in the solution to obtain a tapioca starch / polyvinyl alcohol / chitosan thin composite material. The high barrier composite material has the advantages of good barrier property, degradability and the like, and is an ideal composite material.

Description

technical field [0001] The invention belongs to the technical field of barrier composite material synthesis, and in particular relates to a degradable high barrier composite material and a preparation method thereof. Background technique [0002] Environment, population and resources are the three main problems restricting the sustainable development of our country in the 21st century. Saving resources and protecting the environment have become the basic strategies for countries all over the world to achieve sustainable development. For half a century, chemically synthesized plastic products have been widely used in food packaging and fresh-keeping fields precisely because of their rich sources, light weight, beautiful products, convenient processing, hygiene, low price, and stable properties. Non-biodegradable and non-completely renewable; consume more petroleum resources: discharge serious pollution to the environment during the whole life cycle of production, transportat...

AI Technical Summary

Problems solved by technology

For half a century, chemically synthesized plastic products have been widely used in food packaging and fresh-keeping fields precisely because of their rich sources, light weight, beautiful products, convenient processing, hygiene, low price, and stable properties. Non-biodegradable and non-completely renewable; consume more petroleum resources: discharge serious pollution to the environment during the whole life cycle of production, transportation, etc.; one-time use also leads to a lot of waste: waste is neither degradable nor easy Recycling; Harmful compounds in plastics may migrate to food and affect food safety and other disadvantages. Therefore, countries are now strictly restricting the use of plastics

Images