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Method for preparing methyl cellulose and lipid packaging film

A technology of methyl cellulose and packaging film, applied in packaging, wrapping paper, biological packaging, etc., can solve the problems of reducing mechanical properties and destroying the space network structure, so as to improve the spatial distribution, improve the comprehensive performance, and solve the cumbersome process Effect

Inactive Publication Date: 2015-11-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when lipids are blended with polysaccharides by traditional methods, the lipids largely destroy the original solid spatial network structure inside the polysaccharides, thereby reducing the mechanical properties of the membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Prepare 150ml of an aqueous solution of ethanol with a volume fraction of 25%, heat it in a water bath to 80°C, weigh 6g of methylcellulose, slowly pour it into the ethanol solution, and keep stirring at the same time to fully disperse the methylcellulose. Place the membrane solution on a magnetic stirrer to stir, add 1.5 g of polyethylene glycol 400 and 1 g of stearic acid to the membrane solution, and continue stirring for 115 minutes while keeping warm in a water bath.

[0019] 2. Put the membrane liquid into the microwave-ultrasonic combined reaction system, and process it for 10 minutes under the conditions of microwave power 300w and ultrasonic power 300w.

[0020] 3. Using the casting method, inject the film liquid into the film forming device, and place the film forming device horizontally in a drying oven for drying. After drying, the film was removed, and the film sample was placed in a constant temperature and humidity chamber with a temperature of 25°C an...

Embodiment 2

[0022] 1. Prepare 150ml of an aqueous solution of ethanol with a volume fraction of 25%, heat it in a water bath to 80°C, weigh 6g of methylcellulose, slowly pour it into the ethanol solution, and keep stirring at the same time to fully disperse the methylcellulose. Place the membrane solution on a magnetic stirrer to stir, add 1.5g of polyethylene glycol 400 and 1g of stearic acid to the membrane solution, continue stirring for about 15min, and keep warm in a water bath.

[0023] 2. Put the membrane liquid into the microwave-ultrasonic combined reaction system, and treat it for 20 minutes under the conditions of microwave power 500w and ultrasonic power 600w.

[0024] 3. Using the casting method, inject the film liquid into the film forming device, and place the film forming device horizontally in a drying oven for drying. After drying, the film was removed, and the film sample was placed in a constant temperature and humidity chamber with a temperature of 25°C and a relative...

Embodiment 3

[0026] 1. Prepare 150ml of an aqueous solution of ethanol with a volume fraction of 25%, heat it in a water bath to 80°C, weigh 6g of methylcellulose, slowly pour it into the ethanol solution, and keep stirring at the same time to fully disperse the methylcellulose. Place the membrane solution on a magnetic stirrer to stir, add 1.5g of polyethylene glycol 400 and 1g of stearic acid to the membrane solution, continue stirring for about 15min, and keep warm in a water bath.

[0027] 2. Put the membrane liquid into the microwave-ultrasonic combined reaction system, and treat it for 30 minutes under the conditions of microwave power 700w and ultrasonic power 900w.

[0028] 3. Using the casting method, inject the film liquid into the film forming device, and place the film forming device horizontally in a drying oven for drying. After drying, the film was removed, and the film sample was placed in a constant temperature and humidity chamber with a temperature of 25°C and a relative...

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Abstract

The invention relates to a method for preparing a methyl cellulose and lipid packaging film, and belongs to the technical field of food packaging. Methyl cellulose and a lipid are used as main film forming materials, and a plasticizing agent is used as an accessory material. The preparation method comprises the following steps: (1) weighing methyl cellulose, adding a hot ethanol water solution into the methyl cellulose, and adding the plasticizing agent and the lipid after the methyl cellulose is fully dissolved to form a mixed film liquid; (2) performing a synergistic processing of microwave and ultrasonic on the mixed film liquid, forming a film through tape casting, drying and taking out the film to obtain the methyl cellulose-based composite food packaging film. Compared with the prior art, the lipid-containing methyl cellulose film liquid is subjected to the synergistic processing of microwave and ultrasonic to prompt the crystallization of a lipid substance on the surface of a methyl cellulose substrate through a self-association effect, so that a dense lipid layer is formed and a double-layer structure is formed finally. The double-layer film prepared by the method is non-toxic, edible and biodegradable, can be formed by only one tape casting, is simple in film preparation process, meanwhile, has excellent mechanical and moisture-resistant properties, and can be used as a food inner package.

Description

technical field [0001] The invention belongs to the technical field of food packaging, and in particular relates to a method for preparing a methylcellulose-lipid packaging film. Background technique [0002] With the increasingly serious problem of environmental pollution, as a non-toxic, degradable, green and environmentally friendly edible packaging material has become a current research hotspot. At present, most edible films are composite films made of a mixture of various film-forming substances, which have relatively comprehensive and balanced properties. [0003] Methyl cellulose is a relatively common polysaccharide film-forming substrate. Due to its special long-chain helical molecular structure, it has good film-forming properties, and grade A cellulose films also exhibit excellent mechanical properties. However, due to the hydrophilic properties of its cellulose derivatives, methylcellulose membranes have poor moisture barrier properties. Therefore, researchers ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08J3/28C08L1/28C08K5/053C08K5/06C08K5/09B65D65/46
CPCY02A40/90Y02W90/10
Inventor 万锕俊钟恬
Owner SHANGHAI JIAO TONG UNIV
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