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Controlled-bactericide-release fruit and vegetable preservative packaging composite film, preparation method thereof, and use thereof

A technology for preservation and controlled release of fruits and vegetables, applied in the directions of preservation, application, and packaging of fruits and vegetables, it can solve the problems of insufficient controlled release, difficulty in producing sufficient amounts of sulfur dioxide, etc., to inhibit further erosion, prevent bacterial growth, The effect of delaying ripening

Active Publication Date: 2009-12-16
大家智合(北京)网络科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And Andrew Scully then utilizes calcium sulfite as the precursor substance that produces sulfur dioxide, and calcium sulfite produces sulfur dioxide as a fungicide in the presence of an organic acid. The controlled release of sulfur dioxide is still not sufficient, and it is difficult to meet the requirements of producing a sufficient amount of sulfur dioxide under different conditions. Therefore, it is necessary to provide a composite film for fruit and vegetable fresh-keeping packaging that can meet the requirements of producing a sufficient amount of sulfur dioxide as a fungicide under different conditions.

Method used

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  • Controlled-bactericide-release fruit and vegetable preservative packaging composite film, preparation method thereof, and use thereof

Examples

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preparation example Construction

[0049] Another specific embodiment of the present invention provides a method for preparing the composite film for fresh-keeping packaging of fruits and vegetables, including:

[0050] Step (1): A certain amount of low-density polyethylene resin and polyethylene vinyl acetate resin are melt-blended in an extruder, then blown into a film with a thickness of 20 to 40 microns, and optionally corona treated, as the inner layer of the fruit and vegetable fresh-keeping packaging composite film;

[0051] Step (2): The thickness is 10-20 microns, the moisture permeability is less than 10ml / (m 2 day·atm) selected from the group consisting of low-density polyethylene, low-density polyethylene and linear low-density polyethylene, high-density polyethylene, medium-density polyethylene blended modified resin film, or biaxially oriented polypropylene The non-polar film in carries out corona treatment, as the outer layer of described fruit and vegetable fresh-keeping packaging composite fil...

Embodiment 1

[0079] The fruit and vegetable fresh-keeping packaging composite film with controlled release of bactericide of embodiment 1 is prepared by the following method:

[0080] Step 1. Buy 10-20 microns thick water vapor transmission rate less than 10ml / (m) on the market 2 day · atm) of BOPP film, corona treatment, spare.

[0081] Step 2. Melt and blend 900g of LDPE resin and 100g of EVA resin in a twin-screw extruder, then blow mold it into a film with a thickness of 20 to 40 microns, and perform corona treatment for subsequent use.

[0082] Step 3. Take 90g of solvent-based two-component polyurethane binder (component A), add a mixture of 10g sodium metabisulfite and 10g calcium sulfite, stir evenly, then add 10g of polyurethane component B (crosslinking agent), mix 5min.

[0083] Step 4. carry out dry compounding to the BOPP film (outer layer film) after corona treatment and the LDPE / EVA film (inner layer film) obtained by step 2 with the binding agent that step 3 obtains, obta...

preparation Embodiment 2

[0086] The difference from Preparation Example 1 is that in step 2, 800g of LDPE resin and 200g of EVA resin are melt-blended in a twin-screw extruder, and then blown into a film with a thickness of 20-40 microns, and subjected to corona treatment for future use. The rest are the same, make a composite fresh-keeping packaging film, add the same fruit simulant, and measure the concentration of the fungicide produced.

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Abstract

The invention relates to a controlled-bactericide-release fruit and vegetable preservative packaging composite film and a preparation method thereof. The innermost layer of the composite film is a controlled-release layer; the middle layer of the composite film is a bactericide generating layer; the outermost layer of composite film is a sulfur dioxide barrier layer and / or a printed layer; and the optional first additional layer is an ethylene absorbing layer. In a closed fruit preservative bag made of the fruit and vegetable preservative packaging composite film, a dynamic balance among (water vapor produced in the metabolism of fruits and organic acid produced by bacterium corrosion), the polarity of the inner-layer thin film and generation of sulfur dioxide at a certain concentration is achieved; and once the bacterium corrosion degree of the fruits increases, the balance is disturbed and lots of vapor and organic acids are produced. The substances can penetrate the inner layer to enter the middle layer to cause inorganic salts in the middle layer to decompose to give sulfur dioxide at a high concentration, and the sulfur dioxide can be released by penetrating the inner layer to kill bacteria; and when the fruit is not corroded by bacteria, the water vapor in the system induces the inner layer to produce low-concentration sulfur dioxide to protect the fruits from bacterium corrosion.

Description

technical field [0001] The invention belongs to the fields of processing and food fresh-keeping of composite flexible packaging films, and in particular relates to a composite film for fruit and vegetable fresh-keeping packaging capable of controlled release of bactericides and the field of preparation thereof. Background technique [0002] In recent years, due to the specialization of agricultural production and the improvement of people's quality of life, more and more long-distance transportation of fresh fruits has occurred, and the demand for fresh-keeping packaging materials that extend the storage and shelf life of fruits has also increased accordingly. Fresh fruits continue to breathe after picking, and the respiration is accompanied by metabolism, water evaporation and ethylene production, which promotes the further ripening of fruits and vegetables; this storage environment also makes it easy for bacteria to breed and multiply rapidly, resulting in fruit rot. In or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B7/00A23B7/152B65D65/40B32B27/32B32B27/18
Inventor 许文才李东立刘全校罗世永曹国荣
Owner 大家智合(北京)网络科技股份有限公司
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