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Biologically degradable packing film and its prepn

A packaging film and fully degradable technology, applied in the field of biodegradable packaging film and its preparation, can solve the problems of difficult absorption of plastics, adverse environmental effects, and plastic film discarding.

Inactive Publication Date: 2003-01-01
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1: biodegradable living packaging film, its basic composition is: 5% konjac powder, 0.05% α-amylase, 10% acetic anhydride, 74.94% PVA, 0.01% glutaraldehyde, 10 % glycerol.

Embodiment 2

[0011] Embodiment 2: biodegradable packaging film, its basic composition is: 50% konjac powder, 0.1% α-amylase, 5% acetic anhydride, 43.85% PVA, 0.05% glyoxal, 1% ethylene glycol.

Embodiment 3

[0012] Embodiment 3: biodegradable packaging film, its basic composition is: 85% konjac powder, 0.05% α-amylase, 2% acetic anhydride, 8.85% PVA, 0.1% malondialdehyde or epoxy chlorine Propane, 4% polyethylene glycol.

[0013] In the above preparation method of the packaging film, the konjac powder is added to the α-amylase liquid preheated to 50° C., and the konjac powder is added while stirring, and the konjac glucomannan in the konjac powder quickly absorbs water and swells. Then place the container in a 50°C incubator and keep it warm for enzymolysis for 6 hours. When the konjac powder glue can be stirred, put the reactor in a boiling water bath, and the external bath continues to heat and boil, and the konjac powder glue will further thin. , easy to stir, until the temperature of the reaction product in the reaction vessel reaches 95°C, stop the inactivation. Slightly cooled, acetic anhydride was added dropwise with stirring, and the reaction was stirred for 30 minutes. ...

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PUM

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Abstract

The biologically degradable packing film is prepared through enzymolyzing konjaku powder with alpha-amylase to prepare hydrosol, esterifying the hydrosol with acetic anhydride to prepare gelatin with partially enclosed hydroxy in konjaku glucomannan, adding plasticizer to prepare konjaku fluid, mixing with PVA fluid, adding double-functional reagent to prepare homogeneous crosslinked gelatin, stoving and filming in a casting machine. The packing film has certain water tolerance, acid and alkali resistance and adequate strength, and used film can be decomposed by environmental microbes into CO2 and water.

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...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L3/02
Inventor 郑正炯汤家芳
Owner WUHAN UNIV
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