Polypropylene multilayer composite film for milk storage bag and preparation method thereof

Abstract

The invention discloses a polypropylene multilayer composite film for a milk storage bag and a preparation method thereof. The polypropylene multilayer composite film at least comprises an outer layer, a middle layer and an inner layer, wherein the outer layer is made of homo-polypropylene; the middle layer is formed by blending an ethylene-propylene copolymer with the ethylene content of more than 5wt.%, an ethylene-propylene copolymer with the ethylene content of less than 5wt.% and a metallocene catalyzed ethylene-octylefin copolymer; the inner layer is made of polypropylene random copolymer. The temperature in the preparation process is lower than 180 DEG C, and no antioxidant, light stabilizer, nucleating agent or other micromolecular additives are added in the whole process. The milk storage bag prepared from the polypropylene multilayer composite film has no peculiar smell after being unsealed, has no peculiar smell after irradiation sterilization, has good flexibility and low temperature resistance, does not leak liquid or break the bag under a freezing condition after containing breast milk, and can be widely applied to packaging of liquid food and medicines needing to be refrigerated and frozen.

Description

technical field [0001] The invention relates to the field of plastic packaging, in particular to a polypropylene multilayer composite film for milk storage bags and a preparation method thereof. Background technique [0002] Plastic packaging and plastic packaging products are taking an increasing share in the market, especially composite plastic flexible packaging, which has been widely used in food, medicine, chemical and other fields. These products have brought great convenience to people's lives . With the improvement of people's material and living standards, people pay more and more attention to the quality of packaging materials, especially when it comes to food safety, medical hygiene and other aspects. [0003] At present, there is a type of plastic packaging on the market called milk storage bags, also known as breast milk preservation bags. Breast milk bag is a plastic product used for food packaging, mainly used to store breast milk. Mothers can express milk ...

AI Technical Summary

Problems solved by technology

[0005]However, although the above measures have improved the heat resistance and radiation resistance of the film to a certain extent, it may reduce the taste of milk storage bags; A variety of small molecule additives are added to the post-membrane material. These small molecules are easy to migrate into breast milk during long-term contact, which brings food safety hazards on the other hand.

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