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Transparent high-barrier food packaging composite film and preparation method thereof

A food packaging, high-barrier technology, applied in packaging, wrapping paper, transportation and packaging, etc., can solve the problems of polyvinyl alcohol-coated film barrier property decline, unsatisfactory barrier performance, and poor barrier property. Easy and complete cross-linking and curing, excellent oxygen barrier properties, and improved barrier effect

Pending Publication Date: 2021-02-05
RAOPING ZHIXIN COLOR PRINTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among them, the imported ethylene vinyl alcohol copolymer film has excellent barrier properties to gases, but the price is very expensive, and its barrier properties will deteriorate rapidly with the increase of humidity; polyvinylidene chloride coated film and polyvinyl alcohol The heat resistance of the coating film is very poor, and the barrier property of the polyvinyl alcohol coating film will drop sharply under high humidity, neither of which is suitable for high-temperature cooking; polyamide film, polyethylene terephthalate film The composite film formed by laminating the aluminum oxide film on the base material and the cast polypropylene film is already a composite film structure with high barrier properties at the high-temperature cooking level, but after 30 minutes of high-temperature cooking at 121 degrees Celsius After sterilization, its oxygen transmission rate is 6.2cm 3 / (m 2 ·24h·0.1MPa), the water vapor transmission rate is 6.9g / (m 2 24h), after being placed at room temperature for 4 months, the aroma of the food can already be smelled and changed, such a barrier performance is not ideal

Method used

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  • Transparent high-barrier food packaging composite film and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0044] A transparent high-barrier food packaging composite film, characterized in that it includes a first film layer 1, a coating layer 2, an adhesive layer 3, a second film layer 4, a coating layer 2, an adhesive layer 3, and a third film layer arranged in sequence. Film layer 5; the coating layer is a water-based polyurethane-nano-silicon mixed coating layer.

[0045] Further, the first film layer is a polyethylene terephthalate film layer.

[0046] Further, the adhesive layer is an ester-soluble polyurethane adhesive layer.

[0047] Further, the second film layer is a polyamide film layer.

[0048] Further, the third film layer is a polypropylene film layer.

[0049] Further, the polypropylene film layer is a cooking grade cast polypropylene film layer.

Embodiment 2

[0051] This embodiment provides a method for preparing a transparent high-barrier food packaging composite film in Embodiment 1, comprising the following steps:

[0052] In the first step, add 7.5kg of nano-silicon to 32.3kg of deionized water, stir for 15 minutes, then add 9.7kg of water-based polyurethane, stir for 15 minutes, then add 0.5kg of water-dispersed isocyanate curing agent, stir After 20 minutes, ultrasonically disperse for 10 minutes, and then filter with a 300-mesh filter to obtain a water-based polyurethane-nano-silicon mixed coating layer liquid.

[0053] In the second step, the coating is carried out on the dry compound machine, and the coating amount is controlled at 1.5 grams per square meter. The three-level temperature setting of the drying tunnel of the dry compound machine is 75°C, 85°C, and 100°C in sequence, and the machine speed is set to At 80 revolutions per minute, the above-mentioned water-based polyurethane-nano-silicon mixed coating layer liqui...

Embodiment 3

[0058] This embodiment provides a method for preparing a transparent high-barrier food packaging composite film in Embodiment 1, comprising the following steps:

[0059] In the first step, add 10.0kg of nano-silicon to 29.8kg of deionized water, stir for 15 minutes, then add 9.7kg of water-based polyurethane, stir for 15 minutes, then add 0.5kg of water-dispersed isocyanate curing agent, stir After 20 minutes, ultrasonically disperse for 10 minutes, and then filter with a 300-mesh filter to obtain a water-based polyurethane-nano-silicon mixed coating layer liquid.

[0060] In the second step, the coating is carried out on the dry compound machine, and the coating amount is controlled at 1.5 grams per square meter. The three-level temperature setting of the drying tunnel of the dry compound machine is 75°C, 85°C, and 100°C in sequence, and the machine speed is set to At 80 revolutions per minute, the above-mentioned water-based polyurethane-nano-silicon mixed coating layer liqu...

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Abstract

The invention belongs to the technical field of food packaging material preparation, and particularly relates to a transparent high-barrier food packaging composite film and a preparation method thereof. The transparent high-barrier food packaging composite film comprises a first film layer, a coating layer, an adhesive layer, a second film layer, a coating layer, an adhesive layer and a third film layer which are arranged in sequence, and the coating layer is a waterborne polyurethane-nano silicon mixed coating layer. The transparent high-barrier food packaging composite film prepared by theinvention still has excellent barrier property after being cooked and sterilized at the high temperature of 121 DEG C for 30 minutes, so that the shelf life of food is greatly prolonged, and the safety and sanitation of the food are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of preparation of food packaging materials, and in particular relates to a transparent high-barrier food packaging composite film and a preparation method thereof. Background technique [0002] In the food industry, in order to ensure the safety and sanitation of food, maintain the flavor of food, and extend the shelf life of food, two aspects are required: one is the sterilization of the food itself, and meat products are likely to contain botulism and spores of botulinum The resistance is very strong, and it needs to be sterilized by high-temperature cooking at 121 degrees Celsius for 30 minutes to kill the spores and ensure food safety. This also means that its packaging materials need to be suitable for high-temperature cooking and sterilization at 121 degrees Celsius for 30 minutes. The second is to block the intrusion of oxygen and other gases and water vapor from the outside. In food flexible packag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36B32B27/34B32B27/32B32B27/08B32B7/12B32B37/24B32B38/16B32B37/12B65D65/40C08J7/04C08J7/048C08L67/02C08L77/00
CPCB32B7/12B32B27/08B32B27/32B32B27/34B32B27/36B32B37/1284B32B37/24B32B38/164B32B2037/243B32B2255/10B32B2255/26B32B2307/306B32B2307/412B32B2307/7145B32B2307/7244B32B2307/7246B32B2553/00B65D65/40C08J2367/02C08J2377/00C08J2475/04C08J7/0427C08J7/048
Inventor 洪波陈惠平沈国锋杨炜泓吴创勇
Owner RAOPING ZHIXIN COLOR PRINTING
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