Transparent ultrahigh-barrier composite film and preparation method thereof

A composite film, ultra-high technology, applied in the field of flexible packaging film, can solve the problems of limited application range, insufficient bonding force between the evaporated layer and the substrate film, etc., achieve the effects of less material and consumption, improved adhesion, and improved economy

Active Publication Date: 2020-11-10
厦门长塑实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method reduces the shedding of the evaporated layer to a certain extent, but severely limits its application range, a

Method used

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  • Transparent ultrahigh-barrier composite film and preparation method thereof
  • Transparent ultrahigh-barrier composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] In this embodiment, a method for preparing a transparent ultra-high barrier composite film comprises the following steps:

[0064] 1) Preparation of substrate layer biaxially oriented polyamide film:

[0065] S1. Melt and plasticize all the raw materials through their respective extruders according to the proportion of the formula and flow them out through the hanger die. The temperature of each area is set at 250°C;

[0066] S2. Using a low-pressure air knife to attach the melt to the cold drum to form a thick sheet, wherein the thickness of the thick sheet is 180 μm, and the temperature of the cold drum is 20°C;

[0067] S3. After the thick sheet is heated, it is stretched synchronously with a magnetic levitation bidirectional stretching machine, wherein the stretching temperature is 195°C, and the stretching ratio is 3.0*3.3;

[0068] S4, heat-setting the stretched film, wherein the setting temperature is 210°C, the setting time is 8s, then the film is cooled and co...

Embodiment 2

[0101] The difference between Example 2 and Example 1 lies in that the composition and coating parameters of the coating solution for coating the protective layer and the vapor-deposited enhancement layer are adjusted, and the inorganic oxide in the vapor-deposited inorganic oxide is SiOx.

[0102] In this embodiment, a transparent and microwave-heatable high-barrier biaxially oriented polyamide composite film includes a four-layer film structure. Plating reinforcement and substrate layers.

[0103] The base material layer is a biaxially stretched polyamide film, and the polyamide in the base material layer is a PA6-PA66 copolymer. The substrate layer includes an upper surface layer, a first surface layer, an intermediate layer, a second surface layer and a lower surface layer, the inorganic oxide evaporation layer covers the evaporation enhancement layer, and the evaporation enhancement layer covers the upper surface layer; The upper surface layer is a biaxially stretched po...

Embodiment 5

[0249] The difference between Example 5 and Example 1 lies in that the coating parameters and preparation process conditions for coating the protective layer and the vapor deposition enhancement layer are adjusted.

[0250] In this embodiment, a transparent and microwave-heatable high-barrier biaxially oriented polyamide composite film includes a four-layer film structure. Plating reinforcement and substrate layers.

[0251] The base material layer is a biaxially stretched polyamide film, and the polyamide in the base material layer is a PA6-PA66 copolymer. The substrate layer includes an upper surface layer, a first surface layer, an intermediate layer, a second surface layer and a lower surface layer, the inorganic oxide evaporation layer covers the evaporation enhancement layer, and the evaporation enhancement layer covers the upper surface layer; The upper surface layer is a biaxially stretched polyamide film without corona treatment; the middle layer is a high-barrier EV...

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Abstract

The invention discloses a transparent ultrahigh-barrier composite film and a preparation method thereof. A base material layer is prepared by combining a multi-layer co-extrusion process with corona treatment, and then evaporation enhanced coating, inorganic oxide evaporation and surface coating of a protective layer are carried out, so that the ultrahigh-barrier composite film is prepared. The ultrahigh-barrier composite film is sequentially provided with a coating protection layer, an inorganic oxide evaporation barrier layer, an evaporation enhancement layer and a base material layer; wherein the base material layer is a multi-layer co-extrusion biaxially oriented polyamide film and is sequentially provided with an upper surface layer, a first secondary surface layer, a middle layer, asecond secondary surface layer and a lower surface layer; the upper surface layer is a biaxially oriented polyamide film layer subjected to corona treatment and is compounded with the evaporation enhancement layer; the middle layer is an EVOH layer; and the lower surface layer is an anti-blocking smooth layer. The ultrahigh-barrier composite film is transparent, can be boiled in water and heated by microwaves, has excellent barrier property and excellent odor barrier property on oxygen and water vapor, and is particularly suitable for various high-grade packaging fields.

Description

technical field [0001] The invention belongs to the technical field of flexible packaging films, and in particular relates to a transparent ultra-high barrier composite film and a preparation method thereof. Background technique [0002] Food, medicine and electronic components are prone to deterioration, corruption or failure under the conditions of oxygen and moisture. The key to solving this problem is to use high-barrier packaging materials for packaging that are not only aesthetically pleasing, but also can effectively protect products. [0003] At present, the commonly used high-barrier packaging materials in the market include aluminum foil, vacuum aluminized film, EVOH, PVA and PVDC. These materials have good barrier properties, but all have their own obvious defects. For example, the ductility of aluminum foil is poor, and pinholes are easy to form, resulting in a decrease in barrier performance; the adhesion of vacuum aluminized film is not good, and it is not re...

Claims

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Application Information

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IPC IPC(8): B32B27/06B32B27/30B32B27/34B32B33/00B29D7/01
CPCB32B27/34B32B27/06B32B27/306B32B33/00B29D7/01B32B2255/10B32B2255/26B32B2255/20
Inventor 廖贵何陈曦李智尧贾露林新土刘运锦郑伟
Owner 厦门长塑实业有限公司
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