Completely recoverable barrier PE membrane material as well as preparation method and application thereof

Abstract

The invention discloses a completely recoverable barrier PE (polyethylene) membrane material, which comprises three or more than five layers of mutually overlapped membrane layer structures, the base material of each membrane layer is a PE material, and the membrane layer structure at least comprises one HDPE (high-density polyethylene) functional layer taking a high-density polyethylene polymer material as a base material. The preparation method of the membrane material comprises the following steps: feeding, heating and melting, co-extruding, blowing, cooling and shaping, drawing, rolling and the like. In the film blowing cooling shaping stage, all film layers are obtained through one-time film blowing forming, and a film material stretching and extending operation is additionally carried out in the traction process; the number of the extruders is more than five, and the number of the extruders is correspondingly consistent with the number of layers of a membrane material to be prepared; the number of the runners in the die head of the film blowing machine is more than five, and the number of the runners is consistent with the number of layers of a film material to be prepared. The membrane material can be applied to packaging materials or buffer bag materials for various industries. The product provided by the invention has the advantages of environmental protection, good mechanical property, good barrier property, low cost, excellent comprehensive performance and the like.

Description

technical field [0001] The invention relates to an organic packaging film material and its application, and belongs to the technical field of polymer materials. Background technique [0002] In the existing nylon co-extruded film, the recycling grade of the film product will be reduced due to the nylon content, and the cost of the nylon co-extruded film is high. [0003] Existing HDPE films have low dart impact strength, high haze, easy tearing, and low film barrier properties, which limit the application range of HDPE films. [0004] The existing EVOH co-extruded film will also reduce the recycling grade of the film product due to the EVOH content, and the EVOH co-extruded film cost is higher. [0005] At present, there are also a small amount of all-plastic composite packaging materials using the more advanced blow molding EVOH (ethylene-vinyl alcohol copolymer) co-extrusion film technology route. There are two main processes in this technical route. In addition, due to...

AI Technical Summary

Problems solved by technology

Based on this, pure PE film products can be reused after recycling, and have a wide range of applications, but the existing pure PE film materials have poor barrier properties, and the oxygen transmission rate (OTR) is between 2000 and 10000cm 3 / m 2 .day, water permeability (WVTR) in the range of 1~10g / m 2 .day; when used for cushioning packaging and other products, due to the high air permeability, the film leaks quickly after inflation, the air retention time is short, the storage time is short, the packaging is easily damaged during transportation, and the contents cannot be effectively protected

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