High-transparency ultralow-haze PBAT-based flexible film as well as preparation method and application thereof

By blending PBST polymer into PBAT-based films and employing rapid cooling technology in a casting machine, the problems of low transparency and high haze in existing technologies have been solved, enabling the preparation of highly transparent and ultra-low haze PBAT-based films. This improves the optical and mechanical properties of the films and expands their application range.

CN121471676APending Publication Date: 2026-02-06NINGBO INOVI NEW MATERIALS CO LTD
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Patent Information

Application Number
CN202511854844.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-10
Publication Date
2026-02-06

AI Technical Summary

Technical Problem

In the preparation of PBAT-based films, existing technologies add antireflective agents or significantly reduce the film thickness to improve transparency, which affects the mechanical properties and stability of the film. In addition, the low cooling efficiency of blown film method results in low transparency and high haze.

Method used

By melt-blending PBST polymer in PBAT host material and utilizing rapid cooling technology of casting machine, combined with optimized formulation and processing technology, a highly transparent, ultra-low haze PBAT-based flexible film was prepared.

Benefits of technology

Without adding additional antireflective agents or significantly reducing the film thickness, the transparency and haze of PBAT-based films are significantly improved, while maintaining the mechanical properties and processing stability of the films, thus broadening their application areas.

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Abstract

The invention relates to the technical field of biodegradable materials, in particular to a high-transparency ultralow-haze PBAT-based flexible film and a preparation method and application thereof, and the high-transparency ultralow-haze PBAT-based flexible film is composed of poly (butylene adipate-co-butylene terephthalate), poly (butylene succinate-co-butylene terephthalate), an antioxidant, an anti-hydrolysis agent, an anti-blocking agent and a dispersing agent in parts by weight. The polyethylene terephthalate-butylene adipate is used as a main component, the polyethylene terephthalate-butylene adipate can be added as required, and a small amount of other assistants are added to guarantee the performance of the film. According to the invention, PBAT and PBST are blended to improve the optical performance of the film, casting cooling inhibits the formation of a large crystal region, and the transparency is synergistically increased; the problems of low transparency and high haze of the PBAT-based film are solved, the use requirement of the packaging field on the film material is met, and the application of the PBAT material is further widened.
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