Isolating polypropylene composite material and preparation method thereof

Abstract

The invention discloses an isolating polypropylene composite material which is prepared from the following components in terms of parts by weight: 60-80 parts of polypropylene, 20-40 parts of ethylene-vinyl alcohol copolymer and 1-10 parts of compatilizer. Meanwhile, the invention also discloses a preparation method of the isolating polypropylene composite material. The isolating polypropylene composite material has high tenacity, and the impact strength thereof is as high as 210 J / m or so. In addition, the isolating polypropylene composite material has high gas isolation capability, and water vapor permeation speed can be approximately 2000 g*um / (m<2>*24h). The isolating polypropylene composite material has both high gas isolation capability and high tenacity, therefore when the isolating polypropylene composite material is used for preparing an isolating film, a traditional film making process can be adopted, wherein the process is relatively simple and the production cost is relatively low. The isolating polypropylene composite material has a prospect for generalized application.

Description

technical field [0001] The invention relates to a barrier polypropylene composite material, and also relates to a preparation method of the composite material. Background technique [0002] Polypropylene (PP) is a thermoplastic with an average molecular weight of 100,000 to 150,000 and a specific gravity of 0.89 to 0.91cm 3 , with a melting point of 164-170°C. Since PP molecules are catalyzed and polymerized by non-polar propylene, the molecular structure is carbon-carbon and carbon-hydrogen saturated bonds, so it has excellent electrical insulation and chemical stability. However, its gas barrier properties are extremely poor, which hinders the further expansion of its application fields. [0003] Ethylene-vinyl alcohol copolymer (EVOH) is made by saponification and hydrolysis of ethylene and vinyl acetate copolymer (EVA). It has good molding processability, good gas barrier property, fragrance retention, oil resistance and drug resistance. Quality, transparency, especia...

AI Technical Summary

Problems solved by technology

However, due to the low strength of EVOH, the current EVOH barrier film is generally produced by multi-layer co-extrusion with other polymers. In recent years, a coated EVOH film has been developed.

However, the multi-layer co-extrusion process is more complicated and the production cost is higher; and the production of coated EVOH film will cause pollution, so it is not suitable for popularization and use.

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