A method for preparing alternate layered biodegradable polymer barrier materials with excellent water vapor and oxygen barrier properties

Abstract

The invention discloses a method for preparing an alternate layered biodegradable polymer barrier material with excellent water vapor and oxygen barrier properties. The method comprises the main content as follows: the water vapor barrier property and the stability of the barrier property on humidity are improved through adding hydrophobic substances to water vapor barrier layers, and the diffusion path of oxygen is increased to improve the oxygen barrier property through adding a filler with large specific surface area to an oxygen barrier layer; a multi-layer structure of which the water vapor barrier layers are arranged at the outmost layer and the internal oxygen barrier layer and the water vapor barrier layers are alternately arranged is designed by using a coextrusion system, thereby obtaining excellent water vapor and oxygen barrier properties and the stability of the properties on the humidity at the same time; dimensions and form structures of a disperse phase and the filler are optimized to further improve the barrier properties through stretching and shearing force fields in the coextrusion process, and meanwhile, the mechanical property is improved. The method is a continuous production process and is simple in process, products of different batches are stable in quality index, large-scale industrial production can be carried out, and the method has wide industrialization and market prospects, and is of great significance in theoretical research and application and development of a composite material.

Description

technical field [0001] The invention relates to a preparation method of an alternate layered biodegradable polymer barrier material with excellent water vapor and oxygen barrier properties, and more specifically relates to an adjustable morphological structure, excellent oxygen and water vapor barrier properties, barrier The invention discloses a preparation method of an alternate layered biodegradable polymer barrier material whose performance is not affected by changes in environmental humidity and has excellent mechanical properties, and relates to the technical field of composite materials. Background technique [0002] Biodegradable materials are derived from a wide range of renewable resources. After use, they are easy to degrade in the natural environment without causing pollution to the environment. They have become the first choice to replace traditional petroleum-based plastics. Due to its good biocompatibility, non-toxicity and wide range of sources, it has been w...

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Problems solved by technology

[0014] In view of the shortcomings of biodegradable materials that cannot simultaneously have excellent water vapor and oxygen barrier properties and the shortcomings of the existing solution method for preparing layered barrier composite materials, the purpose of the present invention is to propose a melt co-extrusion prepared morphology structure that can It is a method for alternating layered biodegradable polymer barrier materials with excellent water vapor and oxygen barrier properties, barrier properties not affected by environmental humidity changes, and good mechanical properties. This method can be formed at one time to prepare oxygen and water vapor barrier properties at the same time Improved barrier material, its barrier performance is excellent in stability to humidity changes, and its mechanical properties are improved at the same time

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