Polyolefin-based high-barrier film with renewable structure and preparation method of polyolefin-based high-barrier film

Abstract

The invention discloses a polyolefin-based high-barrier film with a renewable structure and a preparation method of the polyolefin-based high-barrier film, and belongs to the technical field of polymer processing. According to the method disclosed by the invention, a dispersed phase polymer A in the polyolefin film is subjected to in-situ deformation through a specific two-way stretching process to generate a huge amount of two-dimensional sheet structures, so that the diffusion paths of small molecules in the film are increased, and the gas permeability coefficient of the film can be reduced by 1-2 orders of magnitude. A two-dimensional filler and an in-situ formed two-dimensional polymer A are bridged to form a barrier network, and the barrier network has a special effect of cooperatively blocking gas small molecules. According to the prepared high-barrier packaging material, a special microstructure with a macroscopic single layer, a microcosmic multi-layer and multi-component structure is creatively obtained in situ, the structure endows the material with excellent gas barrier performance, and the high-barrier packaging material can be obtained again through melt processing of the preparation method disclosed by the invention after forming. The high-barrier packaging material is easy to recycle and has a very good application prospect.

Description

technical field [0001] The invention relates to a structurally renewable polyolefin-based high-barrier film and a preparation method thereof, belonging to the technical field of polymer processing. Background technique [0002] Polyolefins refer to polyethylene, polypropylene and their copolymer resins, which are low in price, good in comprehensive performance, easy to process and shape, and have a high thermal decomposition temperature (generally above 315°C), and are widely used in industrial production and daily life. It is mainly used in agriculture, construction and packaging fields. In addition, because polyethylene and polypropylene are non-toxic to the human body, they are widely used in the production of food packaging, tableware, containers, etc. [0003] Polyethylene and polypropylene are non-polar molecules, so they have the characteristics of resistance to the penetration of polar solvents such as water vapor and low-molecular alcohols, but they have poor barri...

AI Technical Summary

Problems solved by technology

However, it is difficult to solve the problems of large investment, complicated process, and incompatibility between layers, and there is a problem of difficult separation in the recycling process.

The surface modification of polyolefin endows the surface with new properties under the premise of maintaining the properties of the material body, so as to achieve the purpose of functionalization and high performance of the material, but the cost is high, the processing time is long, the product is easy to color, and it needs to be neutralized and washed after treatment. , drying, etc., the pollution is large, and it is not easy to separate after modification, which is not conducive to the recycling of the film

[0005] From the perspective of comprehensive cost accounting, resource recovery and environmental protection, the above modification methods are more or less difficult to recycle and pollute the environment.

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