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Preparation method of fresh-keeping film with high carbon dioxide permeability and application thereof

A technology with carbon dioxide and high permeability, which can be used in applications, fruit and vegetable preservation, food preservation, etc., and can solve problems such as insufficient mechanical strength, loss of permeability selectivity, and poor strength

Inactive Publication Date: 2009-09-02
NAT ENG AN TECH RES CENT FOR PRESERVATION OF AGRI PROD TIANJIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pure polyethyleneimine film has poor strength and high brittleness, and it is easy to produce mechanical damage and lose permeability selectivity.
Blending polyethyleneimine and polyvinyl alcohol can change its brittleness, but the mechanical strength is still insufficient

Method used

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  • Preparation method of fresh-keeping film with high carbon dioxide permeability and application thereof
  • Preparation method of fresh-keeping film with high carbon dioxide permeability and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Mix 100mL of 20% polyethyleneimine (molecular weight 75000) aqueous solution with 5% polyvinyl alcohol (molecular weight 18000, alcoholysis degree 95%) aqueous solution 200mL, defoam and filter and evenly coat on the blue non-woven fabric On, coating amount 200mL / m 2 . Afterwards, put it flat into a clean constant temperature and humidity chamber set at 50°C for 18 hours, then raise the temperature to 130°C and maintain it for 1 hour to obtain a carbon dioxide highly gas-permeable film. The carbon dioxide permeability coefficient of the membrane is 4.5×10 by air permeability measurement. 6 mL / m 2 ·d·atm (the partial pressure difference of carbon dioxide on both sides of the membrane is 1% of atmospheric pressure), and the carbon dioxide / oxygen permeation ratio is 386:1. The obtained film is cut into a square of 10cm * 15cm, and the edge of the square film is heat-sealed on the central part of one side of a common polyethylene fresh-keeping bag whose specification is ...

Embodiment 2

[0017] Mix 50mL of 25% polyethyleneimine (molecular weight 75000) aqueous solution with 5% polyvinyl alcohol (molecular weight 18000, alcoholysis degree 95%) aqueous solution 200mL, defoam and filter and evenly coat on the blue non-woven fabric On, coating amount 150mL / m 2 . Afterwards, put it flat into a clean constant temperature and humidity chamber set at 60°C for 20 hours, then raise the temperature to 140°C and maintain it for 1 hour to prepare a carbon dioxide highly gas-permeable film. The carbon dioxide permeability coefficient of the membrane is 4.8×10 after air permeability measurement. 6 mL / m 2 ·d·atm (the partial pressure difference of carbon dioxide on both sides of the membrane is 1% of atmospheric pressure), and the carbon dioxide / oxygen permeation ratio is 353:1. The obtained film is cut into a square of 10cm * 15cm, and it is heat-sealed on the common polyethylene fresh-keeping bag of the same specification in the same manner as the previous example. Pack...

Embodiment 3

[0021] Among the above-mentioned examples: use polyethyleneimine with molecular weight between 2000-750000, the concentration of its solution is 10%; use polyvinyl alcohol with molecular weight between 10000-50000, alcoholysis degree more than 90%, the concentration of its solution is 1 %.

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Abstract

The invention relates to a preparation method of a fresh-keeping film with high carbon dioxide permeability and an application thereof on the preservation of fruits and vegetables. The prepration method of the film comprises the steps of: fully mixing polyethyleneimine water solution with polyvinyl alcohol water solution, then evenly coating the mixture on non-woven fabric and drying at specific temperature. The permeability coefficient of carbon dioxide of the prepared film is higher than 4 multiplied by 10<6>ml / m<2> d a tm, and the permeability ratio of carbon dioxide / oxygen is higher than 350. When in application, the prepared film is cut into small pieces according to needs, and the edges of the small films are thermally adhered on an ordinary polyethylene or polyvinyl chloride fresh-keeping bag to prepare a fresh-keeping bag with high carbon dioxide permeability. The fresh-keeping bag has obvious effects on the air conditioned preservation of the fruits and the vegetables which are vulnerable to the carbon dioxide, such as winter jujubes, pears, sweet pepper, Fuji apples and so on. The use of the fresh-keeping bag can reduce the carbon dioxide concentration in the fresh-keeping bag with the pears, winter jujubes and the like to be lower than 0.5 percent, thereby prolonging the shelf lives thereof and reducing the decay loss after the storage.

Description

technical field [0001] The invention belongs to the technical field of food preservation, and in particular relates to a preparation method and application of a carbon dioxide high-permeability preservation film. technical background [0002] Spontaneous modified atmosphere preservation of fruits and vegetables is to use a film with certain air permeability to pack harvested fruits and vegetables, rely on the metabolism of fruits and vegetables to reduce the oxygen concentration in the packaging bag, and maintain a certain carbon dioxide concentration in the bag, thereby inhibiting the metabolic process of fruits and vegetables and some microorganisms Growth, the effect of prolonging the fresh-keeping period and reducing storage loss. The currently commonly used plastic wraps are polyethylene and polyvinyl chloride films, which have obvious effects on the modified atmosphere preservation of most fruits and vegetables. However, the physiological characteristics of each fruit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B7/16A23B7/148D06N3/00
Inventor 李家政张平高凯李丽秀
Owner NAT ENG AN TECH RES CENT FOR PRESERVATION OF AGRI PROD TIANJIN
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