Degradable packaging film and manufacturing method thereof

Abstract

The invention relates to a degradable packaging film comprising basic components of: 5-85% of konjac fine powder, 0.01-0.1% of alpha-amylase, 2-10% of acetic anhydride, 5-85% of polyvinyl alcohol, 0.01%-0.05% of an aldehyde bifunctional reagent, and 1-10% of glycerol. The manufacturing method comprises the steps that: konjac fine powder is subjected to enzymolysis by using alpha-amylase, such that a hydrosol is obtained; the hydrosol is esterified by using acetic anhydride, such that a gum in which partial hydroxyl in konjac glucomannan of the konjac fine powder is sealed is prepared; a plasticizing agent is added, such that a konjac fine powder gum-solution is prepared; the konjac fine powder gum-solution and a polyvinyl alcohol gum-solution are blended; the bifunctional reagent is adopted, such that a homogeneous-phase cross-linked gum is prepared; the gum is dried on a casting machine, such that the required packaging film is obtained. The packaging film provided by the invention has certain water resistance, acid and alkali resistances, and enough strength. When the film is discarded, the film can be completely decomposed into carbon dioxide and water by microbes in the environment.

Description

technical field [0001] The invention relates to a fully biodegradable packaging film and a preparation method thereof. Background technique [0002] At present, the daily packaging films on the market are mainly polyethylene or polyvinyl chloride plastic films. Because these plastics are difficult to be decomposed by soil microorganisms and absorbed by plant roots, a large number of plastic films are discarded in the environment after long-term use, causing adverse effects on the environment. . For this reason, people use different methods to improve the performance of plastic film for daily life packaging, but none of them can fundamentally solve the problem of biodegradability of plastic film. Contents of the invention [0003] The present invention aims at the above problems and provides a fully biodegradable packaging film and its preparation method. The obtained packaging film can be completely decomposed into carbon dioxide and water by microorganisms in the environ...

AI Technical Summary

Problems solved by technology

[0002] At present, the daily packaging films on the market are mainly polyethylene or polyvinyl chloride plastic films. Since these plastics are difficult to be decomposed by soil microorganisms and absorbed by plant roots, a large number of plastic films are discarded in the environment after long-term use, causing adverse effects on the environment.

For this reason, people use different methods to improve the performance of plastic films used in daily life packaging, but none of them can fundamentally solve the problem of biodegradability of plastic films.