Polyurethane composition with controllable dispersed phase form as well as preparation method and application thereof

Abstract

The invention provides a polyurethane composition with a controllable dispersed phase form and a preparation method and application thereof, wherein the preparation method comprises the following steps: a mixture of a thermoplastic polyurethane elastomer, a first polymer material and a second polymer material is subjected to melting plasticization and a tensile force field to obtain the polyurethane composition with the controllable dispersed phase form; then, a dispersion phase of a mixture of the thermoplastic polyurethane elastomer, the first polymer material and the second polymer material forms an obvious lamellar-like structure or a rod-like structure under the action of melt plasticizing and a tensile force field, so that on the premise of ensuring better mechanical strength and heat aging resistance, the polyurethane composition has good barrier performance, and can be used as a barrier material to be applied to pneumatic membranes, soft skins, food packages or medicine packages.

Description

technical field [0001] The invention belongs to the field of polyurethane, and relates to a polyurethane composition with controllable dispersed phase morphology and its preparation method and application, in particular to a preparation method of a polyurethane composition with controllable dispersed phase morphology and the dispersion prepared by the preparation method. Polyurethane compositions with controllable phase morphology and applications thereof. Background technique [0002] Low water vapor, gas permeable polymer films for barrier applications. Compared with metal and glass barrier materials, barrier polymer films have the characteristics of light weight, easy processing and molding, and are not fragile. They have become more and more popular in applications such as inflatable film materials, soft skin materials, food packaging and pharmaceutical packaging materials more and more important. At present, commonly used materials with excellent barrier properties ar...

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Problems solved by technology

However, these materials have certain shortcomings. For example, PVDC contains halogens and is easy to pollute the environment; PVA, EVOH and PA have excellent barrier properties to oxygen in dry environments, but their barrier properties are greatly damaged under high humidity conditions.

[0003] As a common synthetic material, polyurethane has been widely used as a barrier material, but due to its molecular structure, it fails to exhibit high barrier properties to moisture and oxygen under high humidity conditions

[0004] CN108070245A discloses a kind of polyurethane composition, with polyurethane, graphene and thermoplastic polyester elastomer as raw material, the diffusion path of gas molecule is extended by the sheet structure of graphene itself and thermoplastic polyester elastomer sea-island structure, and then improves However, due to the limitation of the amount of graphene added and the morphology of the dispersed phase of thermoplastic polyester elastomer, its barrier performance needs to be improved.

[0005] CN107118321A discloses a thermoplastic polyurethane elastomer, through the design of the molecular structure and the introduction of layered silicate, the barrier performance of the material to oxygen and water vapor is improved, but the mechanical properties of the material are reduced due to the influence of the molecular structure

However, too high addition of lamellar inorganic fillers will lead to a decrease in comprehensive properties such as mechanical strength, and polymers with better barrier properties are generally spherical in shape as dispersed phases, and their contribution to barrier properties is generally

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