Degradable biaxially-oriented polylactic acid cigarette film and preparation method thereof

Abstract

The invention relates to the technical field of polylactic acid films, especially to a degradable biaxially-oriented polylactic acid cigarette film and a preparation method thereof. The invention overcomes the problems that an existing polypropylene cigarette film is non-degradable and an existing degradable polylactic acid film is difficult to be applied to cigarette films. According to a technical scheme, the degradable biaxially-oriented polylactic acid cigarette film is composed of a layer A, a layer B and a layer C which are co-extruded and stretched. The layer A comprises, by mass, 80%-90% of heat-seal I-type PLA, 8%-15% of a slipping agent and 2%-5% of an anti-blocking agent, wherein the heat-seal I-type PLA is composed of 70%-80% of crystalline PLA and 20%-30% of non-crystalline PLA. The layer B comprises 90-95% of crystalline PLA, 1-5% of an antistatic agent, 1-2% of a stiffening agent and 1-5% of a toughening agent. The layer C comprises 94-97% of heat-seal II-type PLA, 2-3%of a slipping agent and 1-3% of an anti-blocking agent, wherein the heat-seal II-type PLA is composed of 75-85% of crystalline PLA and 15-25% of non-crystalline PLA. The preparation method comprises the following steps: drying the above components according to the use amounts, carrying out melt extrusion, performing biaxially stretching, carrying out corona treatment, and then successively conducting rolling, aging, and slitting.

Description

technical field [0001] The invention relates to the technical field of polylactic acid films, in particular to a degradable biaxially stretched polylactic acid cigarette film and a preparation method thereof. Background technique [0002] The small packs of cigarettes or the large packs of whole cigarettes are wrapped with a cigarette film that mainly acts as a moisture-proof function. The current cigarette film is generally made of biaxially oriented polypropylene film. The advantage of this film is that it has good transparency. , good dimensional stability, high mechanical strength, and strong water vapor barrier ability; the disadvantage is that this kind of film is not degradable, and the annual consumption of cigarette film in my country exceeds 100,000 tons. From the perspective of energy saving and environmental protection, polypropylene cigarette film has a lot of white pollution and The problem of consuming large amounts of oil resources. [0003] Polylactic acid (a...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to overcome the environmental pollution caused by the existing polypropylene cigarette film and the problem that the existing polylactic acid film is difficult to apply to the cigarette film in terms of sliding performance, antistatic performance, optical performance, etc.

Images