| abstract |
The invention relates to the technical field of polylactic acid films, in particular to a degradable two-way stretching polylactic acid cigarette film and a preparation method thereof, which solve the problems that the existing polypropylene cigarette film is not degradable and the existing degradable polylactic acid film is difficult to use in cigarette films, the scheme is that the degradable two-way stretching polylactic acid cigarette film consists of A, B and C layers which are co-extruded and stretched, wherein the A layer comprises 80-90% of heat-sealing I-type PLA, 8-15% of slipping agent and 2-5% of anti-adhesion agent in percentage by mass, and the heat-sealing I-type PLA consists 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 antistatic agent, 1-2% of stiffness increasing agent and 1-5% of toughening agent; the C layer comprises 94-97% of heat-seal II-type PLA, 2-3% of slipping agent and 1-3% of anti-blocking agent, wherein the heat-seal II-type PLA consists of 75-85% of crystalline PLA and 15-25% of non-crystalline PLA; the preparation method comprises the steps of drying the components according to the using amount, performing melt extrusion, performing biaxial tension, performing corona treatment, rolling, aging and slitting. |