High composite strength VMPET film for medicine packaging

Abstract

The invention discloses a high composite strength VMPET film for medicine packaging. The film comprises a PET base film and an aluminum layer plated on the upper surface of the PET base film, whereinthe PET base film comprises a common treatment layer, a PET core layer, and a BMBI copolymerization modification treatment layer in sequence from top to bottom, and the BMBI copolymerization modification treatment layer is a mixture comprising PET and polyethylene terephthalate-imide copolyester. By performing imide type copolymerization modification on the non-corona surface of VMPET, not only animide segment is introduced in molecular segments, but the content of carboxyl group in the molecular segments is increased; the surface tension of the VMPET non-aluminized surface subjected to copolymerization modification is increased to 58-68 dyn/cm, so that the problem of low composite strength after compounding with PE is solved, and the application range of VMPET is widened.

Description

technical field [0001] The invention relates to the technical field of film manufacture, more specifically, it relates to a high composite strength VMPET film for medicine bag packaging. Background technique [0002] Medicines are special commodities used for the prevention, diagnosis and treatment of diseases, which are closely related to the health and life safety of consumers. Pharmaceutical packaging is the continuation of pharmaceutical production and the last process applied to pharmaceuticals. As packaging materials that directly contact pharmaceuticals, it is an organic part of pharmaceuticals. Due to the bacteria and other microorganisms that may be brought by the packaging materials of the pharmaceuticals, some harmful substances in the packaging materials may be dissolved by the medicines they come into contact with, thereby causing contamination of the medicines, and some ingredients in the medicines may be absorbed by the packaging materials during storage, or ...

AI Technical Summary

Problems solved by technology

However, ordinary VMPET does not have heat-sealing performance. In order to solve its heat-sealing problem, it is usually compounded with heat-sealing materials such as PE or CPP before it can be used for commodity packaging.

[0004] At present, the most commonly used composite film structure for pharmaceutical packaging on the market is BOPP / VMPET / PE, but the low composite strength of the VMPET / PE composite layer in this structure is a common problem, mainly because the non-corona surface of VMPET is composited with PE , although the PET macromolecular chain contains polar groups, so that it has a certain polarity, its surface tension can generally reach 40-44dyn / cm, while the general compound glue is polyurethane, and its surface tension is generally 40-60dyn / cm, because of the difference in surface tension between VMPET and non-aluminized surface, after compounding with it, the composite strength between VMPET / PE is generally around 2.0N / 15mm, which cannot meet the strength requirement of the drug pack greater than 3.0N / 15mm

[0005] Corona treatment is commonly used in the market to increase the surface tension of VMPET non-aluminized, so that the surface tension can reach 50-54dyn / cm, but its treatment effect is affected by time and ambient temperature and humidity. With the increase of storage time and temperature and humidity, decrease in surface tension

Therefore, after compounding with PE, the initial composite strength can reach more than 3.0N / 15mm, which can meet the requirements of the drug pack, but as time goes on, its composite strength will decrease, so that it cannot meet the requirements of the drug pack.

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