Water soluble preservative film for fruits and vegetables and preparation method of preservative film

A water-soluble, fresh-keeping film technology, which is applied in the direction of protecting fruits/vegetables with a coating protective layer, can solve unsafe and unhygienic problems, and achieve the effects of low water loss rate, convenient use, and high two-way permeability

Active Publication Date: 2013-01-30
深圳市乾健科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome some defects and unsafe and unhygienic problems in the existing fresh-keeping technology and develop a water-soluble fresh-keeping film for fruits and vegetables and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Polyvinyl alcohol 1788: 12.0Kg

[0030] Glycerol: 2.5 Kg

[0031] Polyethylene glycol ether—400: 2.0 Kg

[0032] Methylcellulose: 0.6Kg

[0033] Carbonamide: 1.0 Kg

[0034] Fumed silica 1.5Kg

[0035] CoatOSil1211: 0.1 Kg

[0036] Modaflow AQ-3000: 0.2 Kg

[0037] ADDITOL VXW4970: 0.2 Kg

[0038] Water: 79.9 Kg

[0039] The above groups are measured separately, first dissolve glycerin and polyethylene glycol ether-400 in water, then add polyvinyl alcohol 1788 and methyl cellulose into the water, then heat up to 90°C and stir to dissolve; then add other raw materials, Stir and disperse at 1500 rpm for 30 minutes, then cool to 60°C. It is cast onto the steel belt through the casting die head, and dried into a film through four-stage temperature control zones: 120 / 150 / 180 / 160°C drying tunnel.

[0040] The dehydration rate of Chinese cabbage packaged with the fresh-keeping film under the conditions of 30°C / relative humidity RH-75% and 5°C / relative humidity RH-30% ...

Embodiment 2

[0042] Polyvinyl alcohol 2088: 8.0Kg

[0043] Polyvinyl alcohol 0588: 4.0 Kg

[0044] Glycerol: 2.5 Kg

[0045] Polyethylene glycol ether—400: 2.0 Kg

[0046] Polyethylene glycol ether—6000: 0.5 Kg

[0047] Hydroxypropyl methylcellulose: 0.8Kg

[0048] Carbonamide: 1.0 Kg

[0049] Fumed silica 1.2Kg

[0050] CoatOSil1211: 0.2 Kg

[0051] Modaflow AQ-3000: 0.2 Kg

[0052] ADDITOL VXL4930: 0.2 Kg

[0053] Water: 79.4Kg

[0054] The above groups are measured separately, first dissolve glycerin, polyethylene glycol ether-400 and polyethylene glycol ether-6000 in water, then dissolve polyvinyl alcohol 2088, polyvinyl alcohol 0588 and hydroxypropyl methylcellulose Add in water, raise the temperature to 95°C and stir to dissolve; then add other raw materials, stir and disperse at a speed of 2000 rpm for 30 minutes, and cool to 60°C. It is cast onto the steel belt through the casting die, and dried into a film through four-stage temperature-controlled ovens: 120 / 160 / 180 / 160°C....

Embodiment 3

[0057] Polyvinyl alcohol 1788: 9.0Kg

[0058] Polyvinyl alcohol 0588: 3.0 Kg

[0059] Glycerol: 4.0 Kg

[0060] Polyethylene glycol ether—1000: 1.0 Kg

[0061] Polyethylene glycol ether—6000: 0.3 Kg

[0062] Hydroxyethyl cellulose: 0.8Kg

[0063] Carbonamide: 1.2 Kg

[0064] Fumed silica 1.8Kg

[0065] CoatOSil1211: 0.1 Kg

[0066] Modaflow AQ-3000: 0.3 Kg

[0067] ADDITOL VXL4930: 0.2 Kg

[0068] Water: 78.3Kg

[0069] The above groups are measured separately, first dissolve glycerin, polyethylene glycol ether-1000 and polyethylene glycol ether-6000 in water, then add polyvinyl alcohol 1788, polyvinyl alcohol 0588 and hydroxyethyl cellulose into the water , then heat up to 92°C and stir to dissolve; then add other raw materials, stir and disperse at a speed of 1800 rpm for 30 minutes, and cool to 70°C. It is cast onto the steel belt through the casting die head, and dried into a film through four-stage temperature control zones: 120 / 140 / 180 / 160°C drying tunnel.

[...

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Abstract

The invention relates to a water soluble preservative film for fruits and vegetables and a preparation method of the preservative film. The water soluble preservative film for the fruits and vegetables is mainly prepared by the following materials in percentage in weight: 50 to 80% of polyvinyl alcohol with alcoholysis degree of less than 90%; 10 to 30% of polyhydroxy plasticizer, 1 to 5% of auxiliary film forming agent, 3 to 8% of low temperature antifreeze agent, 3 to 10% of adsorbent filling agent and 0.3 to 2% of film-forming adding additive. The preparation method comprises the following two steps of: 1, after metering contents of components of the preservative film in the formula, obtaining a uniform aqueous solution with concentration of 15 to 25% in water; and 2, uniformly casting the prepared solution on a clear steel band, and drying the solution to obtain the film through a dried drying tunnel with temperature of 120 to 180 DEG C. The preservative film has a high barrier property against oxygen, carbon dioxide and nitrogen and the like, and has a high bidirectional permeable exchange capacity for steam, thereby guaranteeing free breathing and water exchange of the fruits and vegetables in a preserving process.

Description

technical field [0001] The invention relates to a method for preparing a green and environment-friendly film, in particular to a method for preparing a water-soluble plastic wrap for fruits and vegetables. Background technique [0002] Most of the existing fresh-keeping fruits and vegetables are treated with chemical substances to preserve the freshness of fruits and vegetables, so it is easy to leave and absorb the chemical substances used for treatment on the surface of fruits and vegetables, which affects the safety and hygiene of fruits and vegetables. Most of the currently used fresh-keeping films for fruits and vegetables are made by punching holes in the plastic wrap to realize the respiration of fruits and vegetables. Because the pores are too large, the moisture in the fruits and vegetables evaporates too quickly and the water loss is serious, so fresh-keeping and storage The freshness and quality preservation time is extremely short, and because the pores can di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L29/04C08L71/08C08K13/02C08K5/20C08K5/053C08K3/26C08K3/34C08K3/36A23B7/16
Inventor 崔跃飞
Owner 深圳市乾健科技有限公司
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