Composite packaging film and preparation method thereof
By adding maleic anhydride-grafted PS copolymer and chain extender ADR4370S to the PLA/PBAT blend system, the problems of phase separation and insufficient interfacial bonding in PLA/PBAT blend films were solved, achieving a stable improvement in material properties, making it suitable for the industrial production of composite packaging films.
CN121930632APending Publication Date: 2026-04-28TIANJIN UNIV OF SCI & TECH
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Patent Information
- Application Number
- CN202610234059.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-27
- Publication Date
- 2026-04-28
AI Technical Summary
Technical Problem
The existing PLA/PBAT blend system suffers from phase separation structure and insufficient interfacial bonding, resulting in unstable mechanical properties of the material, which makes it difficult to meet the requirements of flexible packaging.
Method used
Maleic anhydride-grafted PS copolymer (PS-MA) was used as a compatibilizer and combined with chain extender ADR4370S to regulate the molecular chain structure and interface structure, and composite packaging films were prepared by melt blending.
Benefits of technology
It significantly improves the interfacial bonding of PLA/PBAT blend films, enhances tensile strength, elongation at break, and processing stability, and reduces preparation costs, making it suitable for industrial production.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention provides a composite packaging film and a preparation method thereof, and belongs to the technical field of packaging films. The composite packaging film comprises the following raw materials: poly (butylene adipate-terephthalate), polylactic acid, a maleic anhydride grafted PS copolymer and a chain extender, wherein the addition amount of the maleic anhydride grafted PS copolymer accounts for 1-5% of the total mass of the poly (butylene adipate-terephthalate) and polylactic acid. According to the invention, inorganic filler does not need to be added, and the chain extender ADR4370S and the compatilizer PS-MA are added to form a synergistic regulation mechanism in a melt blending process: the chain extender acts on a molecular chain layer to improve the length of the molecular chain and the rheological behavior of a melt; the compatilizer PS-MA acts on a phase interface layer surface to enhance interface bonding between PLA and PBAT phases, so that the molecular structure and the interface structure of a blending system are optimized at the same time, and the mechanical property, the processing stability and the structural uniformity of the film are improved.
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