Non-adhesive biaxially-oriented polypropylene film for hot lamination and preparation method thereof

Abstract

The invention discloses a non-adhesive biaxially-oriented polypropylene film for hot lamination. The film comprises a heat-sensitive function layer, a substrate layer and an anti-sticking layer which are orderly arranged and are formed by co-extrusion lamination, wherein calculated as the weight ratio, the heat-sensitive function layer accounts for 4 to 33 percent of the total weight of the film, and the anti-sticking layer accounts for 4 to 17 percent of the total weight of the film; the substrate layer comprises 85 to 95 percent of polypropylene, 1 to 5 percent of antistatic composite masterbatch, and 4 to 10 percent of hydrogenated petroleum resin composite masterbatch; the antistatic composite masterbatch comprises 10 to 30 percent of antistatic agent and 70 to 90 percent of the polypropylene; the hydrogenated petroleum resin composite masterbatch comprises 40 to 60 percent of hydrogenated petroleum resin and 40 to 60 percent of the polypropylene; and the anti-sticking layer comprises 95 to 99 percent of the polypropylene and/or polyethylene, and 1 to 5 percent of anti-adhesion masterbatch, and the anti-adhesion masterbatch comprises 5 to 15 percent of antiblocking agent. The invention also provides a method for preparing the non-adhesive biaxially-oriented polypropylene film, which comprises the steps of: adding materials of the layers into extruding machines for melting plastification and extrusion respectively; merging for co-extrusion through a T type die head; performing biaxial tension; and performing corona treatment, and winding into the non-adhesive biaxially-oriented polypropylene film for hot lamination.

Description

Technical field: [0001] The invention relates to an adhesive-free biaxially stretched polypropylene film for thermal compounding of paper and plastics and a preparation method thereof. Background technique: [0002] The surface layer of ordinary three-layer or five-layer co-extruded biaxially oriented polypropylene film is a polypropylene resin layer, and the melting point of polypropylene is relatively high (homopolypropylene is usually about 165°C, and copolymerized polypropylene is usually about 130°C) ). Generally, the temperature of thermal lamination of paper and plastic film should not exceed 95°C, because when the processing temperature exceeds 95°C, the moisture in the paper will be lost, causing the paper to be deformed, coiled and brittle, which will affect the product quality. Due to the high melting point of polypropylene and poor thermal bonding performance, ordinary biaxially oriented polypropylene films cannot be directly thermally laminated with paper at a ...

AI Technical Summary

Problems solved by technology

However, whether it is dry compounding or coating treatment, it means adding an additional production process, which greatly increases the production cost. At the same time, excessive use of adhesives and solvents containing glue is not conducive to environmental protection. And the adhesive is easy to change color and yellow during use, which affects the appearance of the product