Multi-layer co-extrusion heat-sealing type polypropylene film and preparation method thereof

Abstract

The invention discloses a multi-layer co-extrusion heat-sealing type polypropylene film. The multi-layer co-extrusion heat-sealing type polypropylene film is prepared by directly co-extruding of a three-layer structure including a surface layer, a core layer and an inner layer. The surface layer is prepared from the following raw materials comprising, by weight, 70-80 parts of an ethylene-propylene-butylene terpolymer, 12-15 parts of an ethylene-butylene copolymer, 5-7 parts of oxidized polyethlene wax, 13-17 parts of modified mesoporous silica and 3-4.5 parts of polytetrafluoroethylene modified polyethylene wax powder. The core layer is prepared from the following raw materials comprising, by weight, 75-85 parts of polypropylene, 12-16 parts of colorless transparent epoxy resin, 7-9 parts of a polymer of 2, 5-furandione, ethylene and 1-propylene, 4-6 parts of oxidized polypropylene wax and 3-4 parts of nano silicon dioxide. The multi-layer co-extrusion heat-sealing type polypropylene film has the advantages that the normal-temperature static / dynamic friction factor is small, and the high-temperature change is very small; the thermal shrinkage rate is low, and the stiffness is high; the wear resistance is excellent; the barrier property is excellent; and the comprehensive performance is good.

Description

technical field [0001] The invention relates to the technical field of BOPP film for cigarette packaging, in particular to a multilayer co-extruded heat-sealable polypropylene film and a preparation method thereof. Background technique [0002] Biaxially oriented polypropylene (BOPP) film has the characteristics of light weight, transparency, non-toxicity, moisture resistance, low air permeability and high mechanical strength, and is widely used in food, clothing, medicine, chemical and other fields. BOPP film can be multilayered with polypropylene cast film, polyethylene film, polyvinyl alcohol film, etc., so as to improve the performance of the product such as gas barrier, moisture barrier, oil resistance and tear resistance. A packaging material. [0003] Cigarette film is a high-grade BOPP film, which has the characteristics of low heat sealing temperature, good barrier performance, high transparency and uniform thickness. Currently on the market, small packs of hard p...

AI Technical Summary

Problems solved by technology

[0007] 1. The static / dynamic friction coefficients at room temperature are high, and when the ambient temperature is high such as high-speed packaging, the static / dynamic friction coefficients will increase significantly, resulting in poor packaging fluency;

[0008] 2. Poor wear resistance, resulting in surface scratches and other phenomena prone to occur during high-speed packaging or subsequent use;

[0009] 3. The thermal shrinkage rate is large, the stiffness is low, and it is easy to deform when heated;

[0010] 4. Poor barrier performance;

[0011] 5. Poor comprehensive properties such as gloss and haze, heat sealing strength, and mechanical properties

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