Breathable fresh-keeping CPP film

Abstract

The utility model provides a kind of breathable preservative CPP film, including surface layer, intermediate layer and bottom layer, surface layer is fluorine-modified polypropylene hydrophobic layer, waterproof and breathable is realized by surface layer, intermediate layer is microporous polypropylene matrix layer, provide structure by intermediate layer and provide ventilation control, bottom layer grafting polyvinyl alcohol composite layer of hydrophilic group, water locking and moisturizing are realized by bottom layer, surface layer, intermediate layer and co-extrusion molding realize interlayer molecular bonding. The utility model adopts gradient CPP base material system, i. e. surface layer hydrophobic, middle layer microporous and bottom layer hydrophilic, interlayer molecular bonding is realized by co-extrusion process, replace traditional adhesive composite mode, interlayer bonding strength is higher, avoid the delamination problem that traditional composite mode is prone to, eliminate the use of adhesive, reduce material cost, optimize mechanical property and breathability;Bottom layer introduces tea polyphenol grafting polyvinyl alcohol, has moisture adsorption and antibacterial function, can delay the respiration of fruits and vegetables, thereby prolonging the shelf life.

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