A kind of preparation method of temperature buffer type polyvinyl alcohol film

A technology of polyvinyl alcohol film and polyvinyl alcohol, applied in the field of packaging materials, to achieve the effect of reducing loss, small thickness, and reducing food quality changes

Active Publication Date: 2019-04-19
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature buffer film prepared by weaving polycaprolactone / liquid paraffin phase change fiber material on the surface of polyvinyl alcohol film by electrospinning technology has not been reported yet.

Method used

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  • A kind of preparation method of temperature buffer type polyvinyl alcohol film
  • A kind of preparation method of temperature buffer type polyvinyl alcohol film

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] (1) Preparation of polyvinyl alcohol sticky film:

[0030] Weigh 24g of PVA and place it in a beaker, add 200ml of deionized water into the beaker and place it in a high-temperature cooking pot under high pressure at 121°C for 50 minutes. After the temperature in the cooking pot drops to 90°C, take out the beaker and stir it with a glass rod for 5 minutes. , placed in a heat-collecting constant temperature heating magnetic stirrer at 90°C, adjust the rotation speed to 50rpm and stir for 30 minutes, add 1ml glycerin as a plasticizer with a pipette gun while magnetically stirring in a water bath, and continue stirring for 30 minutes to finally obtain PVA Mother liquor, the PVA mother liquor solution is cast on a glass plate, the size of the glass plate is 30×30cm, the temperature of the glass plate is 60°C, keep the temperature of the glass plate constant, and obtain a viscous polyvinyl alcohol film after standing for 20 minutes, which is ready for use;

[0031] (2) Prepa...

Embodiment 1

[0040] Weigh 24g of PVA and place it in a beaker, add 200ml of deionized water into the beaker and place it in a high-temperature cooking pot under high pressure at 121°C for 50 minutes. After the temperature in the cooking pot drops to 90°C, take out the beaker and stir it with a glass rod for 5 minutes. , placed in a heat-collecting constant temperature heating magnetic stirrer at 90°C, adjust the rotation speed to 50rpm and stir for 30 minutes, add 1ml glycerin as a plasticizer with a pipette gun while magnetically stirring in a water bath, and continue stirring for 30 minutes to finally obtain PVA Mother liquor, cast the PVA mother liquor solution on a glass plate, the size of the glass plate is 30×30cm, the temperature of the glass plate is 60°C, keep the temperature of the glass plate constant, and obtain a polyvinyl alcohol film after standing for 50 minutes, peel off the film and put it in Store in a vacuum-sealed high-barrier bag at 4°C.

[0041] The mechanical proper...

Embodiment 2

[0043] Weigh 24g of PVA and place it in a beaker, add 200ml of deionized water into the beaker and place it in a high-temperature cooking pot under high pressure at 121°C for 50 minutes. After the temperature in the cooking pot drops to 90°C, take out the beaker and stir it with a glass rod for 5 minutes. , placed in a heat-collecting constant temperature heating magnetic stirrer at 90°C, adjust the rotation speed to 50rpm and stir for 30 minutes, add 1ml glycerin as a plasticizer with a pipette gun while magnetically stirring in a water bath, and continue stirring for 30 minutes to finally obtain PVA Mother liquor, the PVA mother liquor solution is cast on a glass plate, the size of the glass plate is 30×30cm, the temperature of the glass plate is 60°C, keep the temperature of the glass plate constant, and after standing for 20 minutes, a viscous polyvinyl alcohol film is obtained, which is ready for use.

[0044] Weigh 75ml of chloroform and place it in a beaker, then add 25m...

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Abstract

The invention discloses a preparation method of a temperature buffer type polyvinyl alcohol film. The preparation method comprises the steps of casting a polyvinyl alcohol mother liquid solution on a glass panel of a constant temperature heater, so as to form a sticky film under certain temperature; then, preparing a polycaprolactone / liquid paraffin electrostatic spinning liquid, and spinning the polycaprolactone / liquid paraffin electrostatic spinning liquid on the surface of the polyvinyl alcohol sticky film through electrostatic spinning of an electrostatic spinning device; and finally, adopting polycaprolactone as an electrostatic spinning liquid, spinning the electrostatic spinning liquid on the surface of a polycaprolactone / liquid paraffin layer through electrostatic spinning of the electrostatic spinning device, preparing a three-layer film structure, and drying the three-layer film structure to obtain the film. Relative to other types of fresh-keeping films, the film has good mechanical properties, can achieve a temperature buffer effect, and can prevent quality of frozen food from changing due to fluctuation of different temperature during transportation and carrying processes, nutritional value and commodity value of frozen food can be greatly guaranteed, and the film has wide application in packaging and transportation aspects of frozen food.

Description

technical field [0001] The invention relates to the field of packaging materials, in particular to a method for preparing a temperature-buffering polyvinyl alcohol film. Background technique [0002] Refrigeration plays an important role in food preservation, and low temperature helps prevent or slow down the invasion of harmful microorganisms, physiological changes and chemical changes in food. During the storage and transportation stages, temperature fluctuations in cold chain foods will affect the growth state of ice crystals in food, the rate of chemical reactions and the growth state of microorganisms, which will have a negative impact on food, which will lead to the reduction of food nutritional value and commodity value and shorten the shelf life of food. Therefore, strategies to mitigate potential temperature fluctuations during food commercialization are important. [0003] Phase change material (PCM) refers to the substance that changes the state of matter and ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D7/01
CPCB29D7/01
Inventor 谢晶唐智鹏王金锋陈晨伟
Owner SHANGHAI OCEAN UNIV
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