A strong and transparent polylactic acid biaxially stretched film and preparation method thereof

By adding Janus nanoparticles to polylactic acid and adopting a bidirectional stretching process, the problem of limited improvement in strength and ductility of polylactic acid film after thermal stretching is solved, and the preparation of a high-performance and multifunctional polylactic acid bidirectional stretching film is achieved.

CN118813016BActive Publication Date: 2025-03-25JIANGNAN UNIV
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Patent Information

Application Number
CN202410796482.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-06-20
Publication Date
2025-03-25
Estimated Expiration
2044-06-20

AI Technical Summary

Technical Problem

The strength and ductility of the existing polylactic acid bidirectional tensile film after thermal stretching are limited, and it is difficult to impart functionality. The insufficient interfacial strength of the blend due to compatibility limits the film formation stability and overall performance.

Method used

By adding Janus nanoparticles to polylactic acid as a reactive compatibility agent, combined with the bidirectional stretching process, a polylactic acid bidirectional stretching film with high strength, high ductility, high transparency, high barrier properties and ultraviolet resistance was prepared.

Benefits of technology

The interface interaction between PLA and PPC is significantly improved, the mechanical properties and barrier properties of polylactic acid double-tight film are enhanced, and the preparation of high-performance and multifunctional transparent polylactic acid bidirectional stretch film is realized.

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Abstract

The invention discloses a strong and transparent polylactic acid biaxially stretched film and a preparation method thereof, comprising the following steps: (1) 0.1-3 parts of Janus nanoparticles, 0.1-3 parts of processing aids, 70-95 parts of polylactic acid and 5-30 parts of polypropylene carbonate are fed into a twin-screw extruder for melt extrusion, and a film is cast, and then the film is rapidly cooled by a casting roller to control the initial crystallinity of the PLA film to be less than 5%; (2) the PLA film after cooling is biaxially stretched at 60-100° C. by a biaxial stretching process, and then heat-treated and shaped to obtain the strong and transparent polylactic acid biaxially stretched film. The addition of Janus nanoparticles successfully solves the phase separation problem caused by insufficient interface strength during the biaxial stretching process of the blended film, and a transparent polylactic acid biaxially stretched film with high performance and multifunction is successfully prepared by the biaxial stretching process.
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