A kind of heat-sealing type smoke bopp film and preparation method thereof

Abstract

The invention discloses a heat-sealing BOPP film for cigarettes, which is directly co-extruded from a three-layer structure of a surface layer, a core layer and an inner layer; the surface layer is made of the following raw materials in parts by weight: random copolymerized polypropylene 38 ~45 parts, 20-26 parts of propylene-ethylene copolymer, 25-32 parts of ethylene-methyl acrylate copolymer, 7.5-9 parts of modified crystal tourmaline powder, 1.5-2 parts of 1,6-hexanediol diglycidyl ether 4.6-5.2 parts of a mixture of trimethylsiloxy amodimethylsiloxane and hydroxyl-terminated methyl-3,3,3-trifluoropropyl polysiloxane, polytetrafluoroethylene 3-4.5 parts of modified polyethylene wax powder; the core layer is made of the following raw materials by weight: 80-90 parts of homopolypropylene, 12-17 parts of propylene-ethylene copolymer, 7 parts of ethylene-methyl acrylate copolymer ~9 parts, nano silicon dioxide 2~3 parts. The heat-sealing BOPP film for cigarettes of the present invention has small static / dynamic friction coefficient, good and long-lasting antistatic effect, good low-temperature heat-sealing performance, and excellent comprehensive performance.

Description

technical field [0001] The invention relates to the technical field of BOPP films for cigarette packaging, in particular to a heat-sealing BOPP film for cigarettes 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 industry and other fields. BOPP film can be multi-layered with polypropylene cast film, polyethylene film, polyvinyl alcohol film, etc., so as to improve the gas barrier, moisture barrier, oil resistance and tear resistance of the product. kinds of packaging materials. [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. At present, small packs of hard packs of cigarettes on the market...

AI Technical Summary

Problems solved by technology

[0006] 1. The functional layer (surface layer) usually uses a terpolymer, which has high requirements for raw materials, and poor heat-sealing strength and low-temperature heat-sealing performance;

[0007] 2. Both the static and dynamic friction coefficients at room temperature are high, and when the ambient temperature is high in medium and high-speed packaging, the static / dynamic friction coefficient will increase significantly, resulting in poor packaging fluency;

[0008] 3. The antistatic effect is poor, and the antistatic effect is not durable;

[0009] 4. More small molecule additives are used, resulting in more migration and precipitation of small molecule additives during use, resulting in poor overall performance of the product;

[0010] 5. Poor comprehensive properties such as gloss and haze, heat shrinkage performance, and mechanical properties

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