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A high-barrier biaxially stretched co-extruded film and its preparation method

A biaxially stretched, high-barrier technology, applied in chemical instruments and methods, types of packaged items, packaged foods, etc., can solve problems such as the large influence of temperature and humidity in the barrier environment, the easy pollution of wastes, and the development limit of barrier films. , to achieve the effect of ensuring the original taste of food, excellent ability to block aroma, and avoiding energy consumption

Active Publication Date: 2019-06-07
ANHUI GUOFENG PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For traditional barrier films such as PVDC coating films, there are problems such as barrier properties are greatly affected by environmental temperature and humidity, waste is prone to pollution, and special coating equipment must be used to increase costs, which limits the development of barrier films.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A high-barrier biaxially stretched co-extruded film, the film is composed of an upper surface layer, an upper middle layer, a core layer, a lower middle layer and a lower surface layer, the upper and lower surface layers are barrier layers, and the upper and lower middle layers are adhesive layers; The core layer is composed of 99wt% of isotactic polypropylene homopolymer and 1wt% of ethoxylated amine; the barrier layer is composed of 99wt% of modified acrylonitrile resin (AMA) and 1wt of anti-blocking masterbatch. The adhesive layer is composed of ethylene-vinyl acetate copolymer (EVA).

[0036] In a further scheme, the anti-blocking masterbatch is composed of glass microbeaded silica and isotactic polypropylene carrier, wherein the quality of silicon dioxide accounts for 25wt% of the total mass of the anti-blocking masterbatch, and the particles of silicon dioxide The diameter is 2 μm.

[0037] In a further solution, the single-layer thickness of the barrier layer is...

Embodiment 2

[0045] A high-barrier biaxially stretched co-extruded film, the film is composed of an upper surface layer, an upper middle layer, a core layer, a lower middle layer and a lower surface layer, the upper and lower surface layers are barrier layers, and the upper and lower middle layers are adhesive layers; The core layer is made of isotactic polypropylene homopolymer 98.5wt% and glycerol monostearate 1.5wt%; the barrier layer is made of modified acrylonitrile resin (AMA) 97wt% and anti-blocking masterbatch 3wt% % composition, the adhesive layer is composed of ethylene-vinyl acetate copolymer (EVA).

[0046] In a further scheme, the anti-blocking masterbatch is composed of glass microbeaded silica and isotactic polypropylene carrier, wherein the quality of silicon dioxide accounts for 30wt% of the total mass of the anti-blocking masterbatch, and the particles of silicon dioxide The diameter is 2 μm.

[0047] In a further solution, the single-layer thickness of the barrier layer...

Embodiment 3

[0050] A high-barrier biaxially stretched co-extruded film, the film is composed of an upper surface layer, an upper middle layer, a core layer, a lower middle layer and a lower surface layer, the upper and lower surface layers are barrier layers, and the upper and lower middle layers are adhesive layers; The core layer is composed of isotactic polypropylene homopolymer 98wt% and ethoxylated amine 2wt%; the barrier layer is composed of modified acrylonitrile resin (AMA) 96wt% and anti-blocking masterbatch 4wt%, so The adhesive layer is made of ethylene-vinyl acetate copolymer (EVA).

[0051] In a further scheme, the anti-blocking masterbatch is composed of glass microbeaded silica and isotactic polypropylene carrier, wherein the quality of silicon dioxide accounts for 35wt% of the total mass of the anti-blocking masterbatch, and the particles of silicon dioxide The diameter is 3 μm.

[0052] In a further solution, the single-layer thickness of the barrier layer is 1-4 μm, and t...

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Abstract

The invention discloses a high-barrier biaxial-stretching co-extrusion film and a preparing method thereof. The film is composed of an upper surface layer, an upper middle layer, a core layer, a lower middle layer and a lower surface layer. The upper surface layer and the lower surface layer are barrier layers, and the upper middle layer and the lower middle layer are bonding layers; the core layer is formed by an isotatic polypropylene homopolymer and a liquid antistatic agent, and the mass of the liquid antistatic agent accounts for 1% to 3% of the total mass of the core layer; the barrier layers are formed by modified acrylonitrile resin and anti-blocking master batches, and the mass of the anti-blocking master batches accounts for 1% to 6% of the total mass of the barrier layers; the bonding layers are formed by ethylene-vinyl acetate copolymers. The film is of a five-layer structure, the upper surface layer and the lower surface layer are resin with the barrier performance, and a barrier film is prepared through extrusion biaxial stretching. The input cost of following processing devices such as a coating machine is reduced, the high-barrier biaxial-stretching co-extrusion film has the advantages of being easy to process and low in cost, and meanwhile the solvent pollution problem, the energy consumption problem and the like in the coating process are solved.

Description

technical field [0001] The invention relates to the technical field of films, in particular to a high-barrier biaxially stretched co-extruded film and a preparation method thereof. Background technique [0002] High-barrier plastic packaging materials in the Chinese market have become one of the important development directions of plastic packaging materials. Now a variety of new high-barrier materials with excellent performance have been developed. These new materials will be widely used in food and medicine packaging. . [0003] High barrier film refers to a packaging film that protects the contents of the package, prevents the penetration of pollutants and small molecules such as oxygen, water vapor, liquid and odor, and also prevents the contents of the package from seeping out. The high barrier property of high barrier film means that under the standard state of 23°C and 65% relative humidity, the permeation rate of oxygen is less than 5ml / M 2 Day, water vapor transmi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/32B32B27/08B32B27/30B32B7/12B32B37/15B32B38/00
CPCB32B7/12B32B27/08B32B27/30B32B27/308B32B27/32B32B37/153B32B38/0012B32B38/0036B32B2038/0028B32B2250/40B32B2307/306B32B2307/31B32B2307/50B32B2307/712B32B2307/7244B32B2307/7246B32B2307/7248B32B2307/75B32B2439/70
Inventor 胡海涛彭超王红兵
Owner ANHUI GUOFENG PLASTIC
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