High-barrier PET-Al-PA-PE composite film and preparation method thereof

Abstract

The invention discloses a high-barrier PET-Al-PA-PE composite film and a preparation method thereof.The PET-Al-PA-PE composite film is sequentially provided with a PET protective layer, an Al barrier layer, a PA barrier layer and a PE heat sealing layer from outside to inside, and raw materials of the PA barrier layer comprise polyamide, an ethylene-vinyl alcohol copolymer and a fluorocarbon surfactant; the raw materials of the PE heat sealing layer comprise metallocene polyethylene and an ethylene-propylene copolymer; and a metallocene polyethylene transition layer is coated on the contact surface of the PA barrier layer and the PE heat sealing layer. The PA layer is additionally arranged between the Al foil layer and the PE layer to improve the barrier property, the composition of the PE layer and the composition of the PA layer are correspondingly optimized, and a novel PE layer and PA layer compounding method is provided to guarantee the barrier property and the heat sealing property at the same time.

Description

technical field [0001] The invention relates to the technical field of medical packaging materials, in particular to a high-barrier PET-Al-PA-PE composite film and a preparation method thereof. Background technique [0002] Most of the current liquid medicines are stored in glass bottles or plastic bottles, but glass bottles are fragile and heavy, while plastic bottles are mostly formed by composite hard sheets, usually one-time blister forming. One, when taking medicine like this at first need to separate the plastic bottle that connects together, unscrew cap of bottle again just can take, and opening bottle is also comparatively troublesome. [0003] With the improvement of people's packaging requirements, liquid medicine packaging bags gradually appeared. Flexible packaging contains liquid medicines and requires high barrier performance. Therefore, multi-layer composite films are generally used to increase heat sealing on the one hand. To increase the barrier property, a...

AI Technical Summary

Problems solved by technology

[0002] Most of the current liquid medicines are stored in glass bottles or plastic bottles, but glass bottles are fragile and heavy, while plastic bottles are mostly formed by composite hard sheets, which are usually arranged together by one-time blister forming. One, in this way, when taking the medicine, it is first necessary to separate the plastic bottles connected together, and then unscrew the bottle cap to take it, and opening the bottle is also more troublesome.