A kind of degradable antibacterial composite fresh-keeping film and preparation method thereof

A composite fresh-keeping and antibacterial technology, applied in the field of related materials, can solve the problems of non-degradable plastic wrap, harmful to human health, and natural environment hazards, to solve environmental problems and human health problems, good fresh-keeping effect, high air permeability barrier Effect

Inactive Publication Date: 2021-01-15
SICHUAN AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The preservative films currently on the market cannot be degraded after use, which has brought great harm to the natural environment, and the preservative films currently on the market have poor antibacterial effects and are harmful to human health after use.

Method used

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  • A kind of degradable antibacterial composite fresh-keeping film and preparation method thereof
  • A kind of degradable antibacterial composite fresh-keeping film and preparation method thereof
  • A kind of degradable antibacterial composite fresh-keeping film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] Preparation of PVA rubber: Weigh an appropriate amount of PVA17-88 and add it to a three-neck flask, add an appropriate amount of distilled water, place it in a constant temperature water bath, turn on a high-power stirrer to stir and slowly heat to 60-70 degrees Celsius, then weigh Put a certain amount of glycerin in a beaker, add an appropriate amount of water to heat it to dissolve, slowly add it into the above-mentioned three-necked flask under the stirring of the stirrer, mix well, and then add an appropriate amount of citric acid to remove it. Bubbles, and close the agitator, ultrasonic defoaming filtration treatment to obtain PVA composite glue.

[0029] Pour the prepared PVA composite glue into the mold (glass plate 30×40) by tape casting method, put it into the oven, the temperature of the oven is 55°C, and the baking time is 6 hours. During this period, use a level to ensure the level of the mold, and take it out after the time is up. The mold is placed at 25°...

experiment example

[0037] In this experiment, after determining the mass ratio of chitosan solution, β-cyclodextrin, and glycerol by setting up a single factor experiment, an orthogonal experimental design with 3 factors and 3 levels was adopted, and the L9(33) orthogonal table was used to arrange the experiment. The degree of influence of various factors on the fresh-keeping performance of the film was studied.

[0038] Table 1L 9 (3 3 ) Orthogonal experimental factor level table

[0039]

[0040] Table 2L 9 (3 3 ) Orthogonal experiment scheme and results

[0041]

[0042]

[0043] It can be seen from Table 2 that the optimal proportions of the mass ratio of the polysaccharide solution, the mass ratio of β-cyclodextrin and the mass ratio of glycerin are: 3%, 7%, and 1%, respectively.

[0044] 3 By studying the physical and chemical properties of the film, determine the optimal ratio in the orthogonal

[0045] According to GBT 1040.3-2006 and texture analyzer, composite film tensi...

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Abstract

The invention provides a degradable antibacterial composite preservative film and a preparation method of the film. The method comprises the following steps of: step 1: manufacturing a PVA (polyvinylalcohol) film from PVA by a flow casting film formation method, step 2: preparing a mixed solution from chitosan / beta-cyclodextrin / glycerol, and adding thyme essential oil into the mixed solution, andstep 3: spreading the mixed solution prepared in step 2 on the PVA film and preparing the preservative film by the flow casting film formation method at last. The composite antibacterial preservativefilm prepared by the method is safe, nontoxic, healthy and environment-friendly, has good mechanical properties and higher permeability and barrier properties, is applied to bacterial inhibition andfresh preservation of fruits and vegetables, can effectively inhibit bacteria and achieve a good fresh preservation effect, and solves a series of environmental problems and human health problems caused by the existing physical methods and chemical methods for the fresh preservation of the fruits and the vegetables.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a degradable antibacterial composite fresh-keeping film and a preparation method thereof. Background technique [0002] The preservative film circulating on the market at present has brought great harm to the natural environment because it cannot be degraded after use, and its antibacterial effect of the preservative film circulating on the market is poor, and after use, it is harmful to human health. Contents of the invention [0003] The purpose of the present invention is to solve the above-mentioned defects in the prior art and provide a degradable antibacterial composite fresh-keeping film. [0004] A preparation method of degradable antibacterial composite plastic wrap, comprising the following steps: [0005] Step 1: making PVA into a PVA film by casting film forming method; [0006] Step 2: configuring a mixed solution made of chitosan / β-cyclodextrin / glycerin; addin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/048C08J5/18C08L29/04C08K5/053C08K5/092C09D105/16C09D105/08C09D191/00C09D7/63
CPCC08J5/18C08J2329/04C08J2405/08C08J2405/16C08J2491/00C08K5/053C08K5/092C08J7/0427
Inventor 秦文胡可王吕袁嘉根林上赖兴悦朱小颖王红吴映雪韩乔泓郭欢梁雪马东辉杨燕
Owner SICHUAN AGRI UNIV
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