Recyclable high-oxygen-barrier film material and preparation method thereof

Abstract

The invention discloses a recyclable high-oxygen-barrier film material. The recyclable high-oxygen-barrier film material comprises a first polyolefin functional layer, a second polyolefin functional layer and an ethylene-vinyl alcohol copolymer intermediate barrier layer, wherein the total thickness of the high-oxygen-barrier film material is 150-400 microns, a film layer structure displayed undera microscopic electron microscope comprises only one ethylene-vinyl alcohol copolymer intermediate barrier layer, the layer thickness ratio of the intermediate barrier layer is 10% or below, and theoxygen permeability test value of the membrane material is less than 1 cm<3> / m<2>. day. A preparation method for the film material comprises a plurality of the following steps: feeding; heating and melting; co-extrusion; film blowing, cooling and shaping; traction; rolling; and the like. In the stage of film blowing, cooling and shaping, all the film layers are obtained through one-shot film blowing and shaping; thick film stretching and extending operation is additionally carried out once in the process of traction; and the number of runners of a die head of the film blowing machine is kept consistent with the number of layers of the high-oxygen-barrier film material to be prepared, and the opening size of the runners is widened so as to realize correspondence to the layer thickness ratio. A product prepared in the invention can better maintain high oxygen resistance and high water resistance of the film material, realizes all-plastic compounding, and can be recycled.

Description

technical field [0001] The invention relates to an organic packaging film material, a preparation method and a processing system thereof, and belongs to the technical field of polymer materials. Background technique [0002] Most of the existing toothpaste tubes, shoe polish bags, medicines and other paste packaging bags are made of aluminum, lead, tin and other metals and plastics. The film structure of most of the existing aluminum-plastic composite films Such as figure 1 As shown, it is divided into 3 layers, the middle layer is pure aluminum, and the inner and outer layers are low-density polyethylene layers (LDPE). The three layers of materials are bonded by glue (polyurethane adhesive) and ethyl ester solvent is added, which is easy to emit harmful gases. . figure 2 It is an electron micrograph of the film layer of an existing aluminum-plastic composite film purchased in the market. This type of product generally adopts the process route of "film blowing-film coatin...

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Problems solved by technology

The cost of this kind of barrier composite all-plastic sheet is 30% to 60% higher than that of aluminum-plastic composite hose, and the processed pipe body is soft, which is not conducive to market promotion

[0007]In addition, due to the limitations of existing all-plastic composite packaging material production equipment, it is generally difficult to process composite materials with high thickness, high barrier properties and high interlayer peel strength. Membrane materials, the oxygen barrier coefficient of existing all-plastic composite packaging materials is generally 1.1cm3 / m2~5.0cm3 / m2, which greatly limits the application of all-plastic composite membranes in other fields

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