A kind of multi-layer co-extruded heat-sealing polypropylene film and preparation method thereof

Abstract

The invention discloses a multi-layer co-extruded heat-sealable polypropylene film. The multi-layer co-extruded heat-sealed polypropylene film is directly co-extruded from a three-layer structure of a surface layer, a core layer and an inner layer; wherein, the The surface layer is made of the following raw materials in parts by weight: 70-80 parts of ethylene-propylene-butene terpolymer, 12-15 parts of ethylene-butene copolymer, 5-7 parts of oxidized polyethylene wax, modified 13-17 parts of mesoporous silica, 3-4.5 parts of polytetrafluoroethylene modified polyethylene wax powder; the core layer is made of the following raw materials by weight: 75-85 parts of polypropylene, colorless and transparent ring 12-16 parts of oxygen resin, 7-9 parts of 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-extruded heat-sealable polypropylene film of the present invention has small static / dynamic friction coefficient at room temperature, small change at high temperature, low heat shrinkage rate, high stiffness, excellent wear resistance, excellent barrier performance and good comprehensive performance.

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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