Two-way stretching degradable film and preparation method thereof

Abstract

The invention provides a two-way stretching degradable film, which comprises a layer A, a layer B and a layer C; wherein the layer A is prepared from, by mass, 83%-85% of heat sealing master batch A, 2%-3% of slipping agent, 2%-3% of anti-sticking agent A, 3%-5% of antistatic agent A and 4%-10% of polylactic acid; the layer B comprises the following raw materials in percentage by mass: 80-90% of polylactic acid, 1-5% of an initiator and 5-15% of maleic anhydride; and the layer C is prepared from the following raw materials in percentage by mass: 85 to 88 percent of heat-sealing master batch C, 2 to 5 percent of anti-sticking agent C and 3 to 5 percent of an antistatic agent C; and 2-10% of polylactic acid. The modified polylactic acid and the modified polypropylene are compounded, so that other properties of the film greatly meet the requirements of the existing cigarette packaging film while the degradable requirement is met. The invention also provides a preparation method of the two-way stretching degradable film.

Description

technical field [0001] The invention belongs to the technical field of polymer films, and in particular relates to a biaxially stretched degradable film and a preparation method thereof. Background technique [0002] BOPP cigarette film is also known as biaxially oriented polypropylene cigarette film, referred to as cigarette film, which is co-extruded and stretched from a variety of polypropylene functional materials. Cigarette film has high transparency and gloss, non-toxic material, stable molecular structure, and has a certain barrier function to odor and moisture, so it is an ideal material for cigarette packaging. [0003] The main components of traditional cigarette films are polyolefins extracted from petroleum, and their degradation will take at least a hundred years, which brings a great burden to the environment. On January 19, 2020, the National Development and Reform Commission and the Ministry of Ecology and Environment issued a new version of the plastic rest...

AI Technical Summary

Problems solved by technology

Although the traditional polyolefin packaging cigarette film has excellent mechanical properties, thermal properties and interface smoothness, it has a relatively large negative impact on the environment due to its difficulty in degradation

The new degradable cigarette film in response to the new national policy, such as polylactic acid degradable cigarette film, although it meets the degradation requirements, the elongation at break, heat seal strength and surface smoothness of the cigarette film itself are difficult to meet the relevant requirements of the existing cigarette packaging film

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