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Barrier heat sealing type biaxial tensile composite thin film and preparation method thereof

A composite film and biaxial stretching technology, applied in the direction of chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problems affecting the mechanical properties of the composite film, fast crystallization rate, etc., to achieve increased crystallinity, The effect of high puncture strength and simple production process

Inactive Publication Date: 2012-06-20
FSPG HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite film has excellent oxygen barrier and optical properties, but due to the high crystallinity of polyethylene, fast crystallization rate, and special crystal structure, there are certain difficulties in the biaxial stretching process, which in turn affects the mechanical properties of the composite film.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A barrier heat-sealable biaxially stretched composite film, including a five-layer structure, sequentially composed of a surface layer, an adhesive layer, a barrier layer, an adhesive layer, and a surface layer. The total film thickness is 30 μm, and the thickness of the surface layer is 5 μm. The thickness of the layer is 5 μm, and the thickness of the barrier layer is 10 μm. Each layer of the composite film includes the following components by weight percentage: two surface layers: 90.5% of metallocene linear low-density polyethylene resin with bimodal molecular weight distribution, 2.5% of antistatic agent, anti-blocking 3% agent, 2% slip agent, 2% antioxidant; adhesive layer: EVA 100%; barrier layer: PVDC 100%.

[0036] The preparation method of the present embodiment composite film, comprises the following steps:

[0037] Place the surface layer mixture, EVA, PVDC separately with five extruders, between 200-240°C (the setting temperature of each layer should not ex...

Embodiment 2

[0044] A barrier heat-sealable biaxially stretched composite film, including a five-layer structure, sequentially composed of a surface layer, an adhesive layer, a barrier layer, an adhesive layer and a surface layer, the total film thickness is 40 μm, the surface layer is 7 μm, and the adhesive layer is 7 μm and the barrier layer is 12 μm. Each layer of the composite film includes the following components by weight percentage: two surface layers: 91% of metallocene linear low-density polyethylene resin with bimodal molecular weight distribution, 2.5% of antistatic agent, 2.5% of antiblocking agent, 2% of smooth agent, anti Oxygen agent 2%; bonding layer: grafted modified EMMA 100%; barrier layer: PA6 100%.

[0045] The preparation method of the composite film of this embodiment is the same as that of Embodiment 1.

Embodiment 3

[0047] A barrier heat-sealable biaxially stretched composite film, including a five-layer structure, sequentially composed of a surface layer, an adhesive layer, a barrier layer, an adhesive layer and a surface layer, the total film thickness is 40 μm, the surface layer is 7 μm, and the adhesive layer is 7 μm and the barrier layer is 12 μm. Each layer of the composite film includes the following components by weight percentage: two surface layers: 91.5% of metallocene linear low-density polyethylene resin with bimodal molecular weight distribution, 2% of antistatic agent, 2% of antiblocking agent, 2.5% of smooth agent, anti Oxygen agent 2%; bonding layer: graft modified EMMA 100%; barrier layer: EVOH 100%.

[0048] The preparation method of the composite film of this embodiment is the same as that of Embodiment 1.

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Abstract

The invention discloses a barrier heat sealing type biaxial tensile composite thin film and a preparation method thereof. The thin film comprises two surface layers, and at least a barrier layer, wherein the surface layer and the barrier layer are connected through bonding layers. The thin film is characterized in that the two surface layers comprise the following components, by weight, 90-99% of metallocene linear low density polyethylene resin with a characteristic of bimodal molecular weight distribution, 0-5% of an antistatic agent, 0-5% of an anti-adhering agent, 0-5% of a smoothing agent, and 0-5% of an antioxidant; the barrier layer is a barrier polymer, and the bonding layer is a high strength and high temperature resistance adhesive. The preparation method adopts a multi-layer co-extruding successive biaxial tensile process or a multi-layer co-extruding simultaneous biaxial tensile process. The composite thin film has excellent gas and moisture barrier property, and the mechanical properties of the thin film are further improved. The thin film has characteristics of high tensile strength, low temperature high heat sealing strength, and high puncture resistance strength.

Description

technical field [0001] The invention relates to a barrier heat-sealing type biaxially stretched composite film and a preparation method thereof. Background technique [0002] The barrier composite film can prevent oily food from being oxidized and dry food from getting wet, can maintain the fragrance of aromatic food, and prolong the shelf life of food. hotspot. The barrier resin plays a key role in the barrier composite film, they mainly include polyvinyl alcohol (PVA), ethylene-vinyl alcohol copolymer (EVOH), nylon (PA), polyethylene terephthalate (PET ), polyvinylidene chloride (PVDC), polypropylene carbonate (PPC), etc. [0003] In China, barrier composite films are often produced by dry composite and multilayer co-extrusion blow molding or casting processes. Dry lamination has a wide range of applications, high strength and fast speed, but every time a function is added, it is necessary to add a layer of film substrate and two production processes at the same time, w...

Claims

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Application Information

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IPC IPC(8): B32B27/08B32B27/32B32B27/18B32B27/04B32B27/36B29C69/02B29C47/14B29C47/92B29C35/16B29C55/12B29C59/08B29C59/10B29C48/305B29C48/92
CPCB29C48/92B29C2948/92704B29C2948/92895B29C2948/92923
Inventor 张广强仇植
Owner FSPG HI TECH
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