High-toughness high-water-steam-baffled completely-biodegraded composite multilayer film and preparation method thereof

Abstract

The invention relates to the technical field of polymer materials, and specifically relates to a high-toughness high-water-steam-baffled completely-biodegraded composite multilayer film and a manufacturing method thereof. The film comprises a structure from the second layer to the seventh layer and is composed of a PBAT based high-toughness high-barrier biodegradable material (A), a high-weatherability high-barrier biodegradable material (B), and a high-toughness functional biodegradable material layer (C). A multi-layer co-extrusion film blowing technology is adopted. Multiple material layers are compounded to prepare the film. The film is highly tough, the tensile strength can reach 18 MPa, the horizontal/vertical breaking elongation rate can reach more than 500%, no prominent difference exists in the vertical direction and the horizontal direction, the water steam baffling performance is strong, the water steam penetration rate of the film with a thickness of 10 [mu]m is 240 g/m2.24h; the processing performance is good, the minimal thickness of the film can reach 5 [mu]m; the processing equipment does not need frequent adjustment, and the film is used as a package film, an agricultural cover film, and the like.

Description

technical field [0001] The invention relates to a fully biodegradable composite multilayer film with high toughness and high water vapor barrier and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] While plastic brings civilization to people, it also brings environmental hazards. The total amount of plastic waste in the world is as high as 50 million tons every year, accounting for about 10% of the total plastic products. Because of its wide application fields and scattered use, Moreover, the waste is light in weight and small in size, so recycling is unrealistic and uneconomical, and these products are the main source of white pollution in the urban environment. It is more beneficial to use biodegradable plastics for such products. Therefore, the development of green plastics that are fully biodegradable in the natural environment has attracted extensive attention from governments, scientific research institu...

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Problems solved by technology

Although this method improves the barrier property of water vapor, there are cumbersome production steps (including primary product sy

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