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Preservative film and preparation method thereof

A technology of fresh-keeping film and adsorbent, which is applied in the field of fresh-keeping, which can solve the problems of short fresh-keeping time, impact on human health, and poor fresh-keeping effect, and achieve the effects of prolonging the fresh-keeping time, improving the utilization rate of raw materials, and ensuring safety and sanitation

Active Publication Date: 2020-05-05
常德市德源招商投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the field of food packaging in family life, supermarkets, hotels and restaurants, and industrial production, chemical preservatives are mostly used, but excessive use will affect human health.
A method that is more and more widely used is to use film to maintain the color, aroma and taste of fruits and vegetables and prolong their storage life.

Method used

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  • Preservative film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] The preparation method of the above-mentioned plastic wrap according to an embodiment of the present invention comprises the following steps S1-S3:

[0030] S1. Coating an ethanol solution of hollow porous polymer microspheres on the resin base film.

[0031] S2, mixing the adsorbent with water to obtain a slurry, coating the slurry on the resin base film and drying to form an ethylene adsorption layer.

[0032] S3, forming a waterproof and breathable layer on the vinyl adsorption layer.

[0033] Preferably, the mass percent concentration of the adsorbent in the slurry is 0.2% to 1%. If the concentration is too high, it will be difficult for the adsorbent to fully enter the hollow porous polymer microspheres. If the concentration is too low, the adsorption effect will be reduced.

[0034] In one embodiment, the above-mentioned drying specifically includes the following steps: drying at 15-25°C for 5-6 hours, and then drying at 50-80°C for 1-3 hours. In this way, first...

Embodiment 1

[0039] The ethanol solution of hollow porous polymer microspheres is coated on the resin base film, and the material of the hollow porous polymer microspheres is acrylate copolymer. The adsorbent was obtained by weighing each component according to the following mass percentages: 62% potassium permanganate, 27% methylcyclopropene, 8% chromium trioxide, 2% activated carbon and 1% montmorillonite. Mix the adsorbent with water to obtain a slurry, the mass percent concentration of the adsorbent is 0.5%, coat the slurry on the resin base film, then put it into an environment of 20°C for slow drying for 5 hours, and then put it in an oven at 60°C Dry for 2 hours to form an ethylene adsorption layer. Finally, coated with expanded polytetrafluoroethylene on the ethylene adsorption layer to form a waterproof and air-permeable layer to obtain a fresh-keeping film, wherein the thickness of the resin base film is 10 μm, the thickness of the ethylene adsorption layer is 3 μm, and the thick...

Embodiment 2

[0041] The ethanol solution of hollow porous polymer microspheres is coated on the resin base film, and the material of the hollow porous polymer microspheres is acrylate copolymer. Mix potassium permanganate with water to obtain a slurry, the mass percent concentration of potassium permanganate is 0.5%, coat the slurry on the resin base film, and then put it into an environment of 20°C for slow drying for 5 hours, and then put it in Dry in an oven at 60°C for 2 hours to form an ethylene adsorption layer. Finally, the expanded polytetrafluoroethylene is covered and coated on the ethylene adsorption layer to form a waterproof and breathable layer to obtain a fresh-keeping film, wherein the thickness of the resin base film is 10 μm, the thickness of the ethylene adsorption layer is 3 μm, and the thickness of the waterproof and breathable layer is 5 μm.

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Abstract

The invention relates to a preservative film and a method for preparing the same. The preservative film comprises a resin base film, an ethylene adsorption layer and a waterproof ventilation layer which are sequentially arranged on a stacked manner. The ethylene adsorption layer comprises hollow porous polymer micro-spheres with supported adsorbents, and the adsorbents comprise potassium permanganate and are at least partially supported inside the hollow porous polymer micro-spheres. The preservative film and the method have the advantages that the waterproof ventilation layer is in contact with fruits and vegetables when the preservative film wraps the fruits and vegetables, ethylene generated under the respiration effects of the fruits and vegetables can be transmitted into the ethyleneadsorption layer via the waterproof ventilation layer and can be removed by the potassium permanganate in the ethylene adsorption layer, the potassium permanganate is accommodated in the hollow porouspolymer micro-spheres, the hollow porous polymer micro-spheres have large specific surface areas, the ethylene can cross large quantities of micro-spheres when transmitted into the ethylene adsorption layer, accordingly, sufficient reaction can be carried out on the ethylene and the potassium permanganate, the reaction efficiency can be improved, the utilization rate of raw materials can be increased, the ethylene can be efficiently removed, preservation effects can be improved, and the preservation duration can be prolonged.

Description

technical field [0001] The invention relates to the field of fresh-keeping technology, in particular to a fresh-keeping film and a preparation method thereof. Background technique [0002] Fresh fruits and vegetables are important sources of daily vitamins, minerals and dietary fiber, and have unique shapes, colors, aromas and tastes. The tissues of fruits and vegetables have high water content and are soft and tender, but they are perishable and degenerate, and they are not resistant to storage. After harvesting, they are prone to water and lose their freshness, resulting in reduced quality and even loss of commodity value and nutritional value. The demand for fruits and vegetables is second only to grain in the world. After years of development, my country has become the largest producer of fruits and vegetables in the world. With abundant germplasm resources and a long history of cultivation, it is the birthplace of many kinds of fruits and vegetables in the world. Post-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08B32B27/30B32B27/32B32B33/00B32B37/02B32B37/24B32B38/00
CPCB32B27/08B32B27/30B32B27/304B32B27/32B32B27/322B32B33/00B32B37/02B32B37/24B32B38/164B32B2037/243B32B2250/24B32B2255/10B32B2255/26B32B2264/10B32B2264/12B32B2307/724B32B2307/758B32B2410/00
Inventor 余赞钟文冯杰张勇军田璐罗臻韦雪雪杜建军
Owner 常德市德源招商投资有限公司
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