PLA/PBAT film capable of being rapidly degraded and preparation method thereof

Abstract

The invention belongs to the technical field of preparation of polymer films, and particularly relates to a PLA / PBAT film which is high in ductility and can be quickly degraded in water or alkali liquor and a preparation method thereof. The film material comprises the following components: 30-70 parts by weight of PLA; 30-70 parts by weight of PBAT; 0.01-0.4 parts by weight of a basic salt; 0.1-0.5 parts by weight of a chain extender; and 0.2 parts by weight of an antioxidant. The film is prepared by twin-screw extrusion granulation and blow molding. In extrusion molding, part of ester bonds of PLA and PBAT are broken under the catalytic action of the basic salt to form PLA and PBAT with low molecular weight, and reactive chain extension and compatibilization are carried out under the action of the chain extender. The PLA / PBAT film disclosed by the invention has the advantages of high toughness, high degradation rate in water or alkali liquor and the like, and has a good application prospect in the fields of express delivery, food, clothing, daily necessity packaging and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer film preparation, and in particular relates to a PLA / PBAT film with high ductility and rapid degradation under water and alkaline solution and a preparation method thereof. [0002] technical background [0003] Due to the irreplaceability of plastics in the national economy and people's lives, since humans began to manufacture plastics on a large scale in 1950, humans have produced about 8.3 billion tons of plastics, of which 6.3 billion tons have become garbage. In 2050, it will exceed 34 billion tons, and the output of waste plastics will be 12 billion tons. Plastic pollution has put enormous pressure on the environment, and the world is actively promoting recyclable and easily recyclable degradable alternatives. Biodegradable polymer materials, especially those derived from renewable resources, have received great attention. [0004] As a degradable and renewable polymer, polylactic acid (PLA...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of poor compatibility, poor toughness and long degradation cycle of PLA / PBAT film. By introducing alkaline salt additives into the PLA and PBAT blend system, the basic salt additives and chain extenders The synergistic effect of PLA / PBAT film with high toughness and fast degradation rate in water or lye was obtained

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