| abstract |
The invention provides a fully biodegradable composite film, a preparation method and a courier bag thereof. Specifically, the composite film includes a first layer, a second layer and a third layer that are stacked in sequence; the first layer and the third layer include: 70-90 parts by weight of plasticized starch, 5- 15 parts by weight of polylactic acid, 5 to 15 parts by weight of polycaprolactone, and 0.02 to 0.1 part by weight of a chain extender; the second layer comprises: 60 to 80 parts by weight of polypropylene carbonate, 5 to 15 parts by weight of poly(adipic acid/terephthalate) butylene diester, 5-15 parts by weight of polycaprolactone, and 0.02-0.1 part by weight of chain extender. The fully biodegradable composite film and the express bag of the present invention have excellent barrier properties, high strength, high toughness, and puncture resistance, meet various needs in express transportation, and also have certain degradation ability in soil and seawater. |