Anti-fogging toughened antibacterial cast polypropylene food packaging film and preparation method thereof

Abstract

The invention discloses an anti-fogging toughened antibacterial cast polypropylene food packaging film. The anti-fogging toughened antibacterial cast polypropylene food packaging film is a co-extrusion cast composite film and comprises a corona layer, a core layer and a heat-seal layer in sequence from outside to inside, wherein the corona layer, the core layer and the heat-seal layer are made from polypropylene; the heat-seal layer is prepared from the following raw materials of a polypropylene random copolymer, metallocene polyethylene and a blend macromolecular antimicrobial containing epsilon-polylysine. The blend macromolecular antimicrobial is prepared by a blending reaction of the epsilon-polylysine and polyvinyl alcohol in the existence of a plasticizer and water and drying. In theantibacterial barrier polyethylene packaging film, by introducing the blend macromolecular antimicrobial, the number of hydrophilic groups on the surface of the heat-seal layer can be increased, so that on the premise of not adding an anti-fogging agent, the anti-fogging effect of the heat-seal layer is good at a temperature close to 0 DEG C. The invention further discloses a preparation method of the anti-fogging toughened antibacterial cast polypropylene food packaging film.

Description

technical field [0001] The invention belongs to the technical field of food packaging films, and in particular relates to an antifogging, toughened and antibacterial cast polypropylene food packaging film and a preparation method thereof. Background technique [0002] Cast polypropylene film (CPP) is a kind of non-stretched and non-oriented web extrusion film produced by melt casting and quenching. It has the characteristics of high transparency, easy heat sealing and good toughness. It is widely used in daily chemical It can also be used as a heat-sealing material for high-temperature cooking films and inner layers of composite films in flexible packaging. The advantage of the composite CPP cast polypropylene film is that the film performance has both the respective advantages of multiple film layers, and the cost is low. For example, the two-layer co-extruded CPP used for cooking can withstand cooking and sterilization at 120°C and 15Mpa pressure, which can not only maint...

AI Technical Summary

Problems solved by technology

In the prior art, CPP anti-fogging agents such as compounds containing polyvinyl alcohol, polyolefin and esterified polyvinyl alcohol, vinyl acetate and vinyl pivalate, etc. have unsatisfactory anti-fog effects when they are close to zero. In the technology, the antibacterial of the film mostly uses inorganic antibacterial agents, which not only affects the transparency of the film, but also has high production costs.

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