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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 effects of easy control of film making process, increase of temperature buffer performance, and guarantee of nutritional value and commodity value

Active Publication Date: 2017-09-26
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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  • Preparation method of temperature buffer type polyvinyl alcohol film
  • 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 adhesive film:

[0030] Weigh 24g of PVA and place it in a beaker. Add 200ml of deionized water to the beaker and place it in a counter-pressure high-temperature cooking pot for 50 minutes at 121°C. After the temperature in the cooking pot drops to 90°C, take out the beaker and use a glass rod to fully stir for 5 minutes , Placed in a heat-collecting thermostatic heating magnetic stirrer at 90℃, adjust the speed to 50rpm and stir for 30 minutes, use a pipette to add 1ml glycerin as a plasticizer while magnetic stirring in a water bath, continue stirring for 30 minutes, and finally obtain PVA Mother liquor, the PVA mother liquor solution is cast on a glass plate, the glass plate is 30×30cm, the temperature of the glass plate is 60℃, and the temperature of the glass plate is kept unchanged. After standing for 20 minutes, a viscous polyvinyl alcohol film is obtained for use;

[0031] (2) Preparation of polycaprolactone / liquid paraffin electr...

Embodiment 1

[0040] Weigh 24g of PVA and place it in a beaker. Add 200ml of deionized water to the beaker and place it in a counter-pressure high-temperature cooking pot for 50 minutes at 121°C. After the temperature in the cooking pot drops to 90°C, take out the beaker and use a glass rod to fully stir for 5 minutes , Placed in a heat-collecting thermostatic heating magnetic stirrer at 90℃, adjust the speed to 50rpm and stir for 30 minutes, use a pipette to add 1ml glycerin as a plasticizer while magnetic stirring in a water bath, continue stirring for 30 minutes, and finally obtain PVA The mother liquor, the PVA mother liquor solution is cast on a glass plate, the glass plate is 30×30cm, the temperature of the glass plate is 60℃, the temperature of the glass plate is kept unchanged, and the polyvinyl alcohol film is obtained after standing for 50 minutes. Vacuum and seal in a high-barrier bag for storage at 4℃.

[0041] Determine the mechanical properties and heat storage capacity of the fi...

Embodiment 2

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

[0044] Weigh 75ml of chloroform and place it in a beaker, then add 25ml of N,N-dimethylformamide to it...

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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 buffer type polyvinyl alcohol film. Background technique [0002] Refrigeration plays an important role in food preservation. Low temperature helps prevent or slow down 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 the food, the rate of chemical reactions, and the growth state of microorganisms, and have a negative impact on the food, which will lead to a reduction in the nutritional value and commodity value of the food And shorten the shelf life of food. Therefore, strategies for mitigating potential temperature fluctuations in the commercialization of food are very important. [0003] Phase change material (PCM) refers to a substance that changes the state of a substance with t...

Claims

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Application Information

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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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