Reactive compatibilized active polylactic acid packaging material as well as preparation method and application thereof

By grafting maleic anhydride onto the PLA molecular chain to generate PLA-g-MAH, the compatibility problem between PLA and tannic acid was solved, achieving uniform dispersion and functional stability of the active packaging film, and improving the preservation effect of fruits and vegetables.

CN122011707APending Publication Date: 2026-05-12SHANGHAI OCEAN UNIV
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Patent Information

Application Number
CN202610087350.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-22
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

Pure PLA film has poor compatibility with tannic acid, leading to phase separation and aggregation, which affects the mechanical and barrier properties of the film. Furthermore, the distribution of active ingredients is uneven and the release of functions is uncontrollable, making it difficult to apply in the preservation packaging of fresh fruits and vegetables.

Method used

By employing reactive melt extrusion technology, maleic anhydride is grafted onto PLA molecular chains to generate PLA-g-MAH. Through interactions such as hydrogen bonding, the dispersibility and interfacial bonding of TA in the PLA matrix are improved, a stable interface is constructed, and a PLA/TA compatible system is prepared.

Benefits of technology

This method achieves uniform dispersion of TA in the PLA matrix, enhances the antioxidant and antibacterial properties of the film, maintains mechanical properties, regulates gas permeability, and extends the shelf life of fruits and vegetables.

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Abstract

The invention belongs to the field of food packaging materials, and particularly relates to a reactive compatibilization active polylactic acid packaging material as well as a preparation method and application thereof. The reactive compatibilization active antioxidant antibacterial polylactic acid material is prepared from polylactic acid, tannic acid and a polylactic acid and maleic anhydride grafted copolymer through blending and melt extrusion processes, and the polylactic acid and maleic anhydride grafted copolymer is prepared from polylactic acid, maleic anhydride and an initiator through blending and melt extrusion processes. The packaging film can be used for packaging food or flowers, effectively delaying browning, inhibiting microbial growth, maintaining hardness and quality and prolonging shelf life. The raw materials are green and degradable, the process is simple and continuous, the method is suitable for industrial production, and a new way is provided for development of active functional packaging.
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