High-tenacity pla shrink film and method of making same
By combining bio-based plasticizers and nano-silica with PEG-PLLA block copolymers and PBS as toughening agents, a PLA shrink film with an A/B/A three-layer structure was prepared, which solved the problems of poor toughness and slow degradation of PLA shrink film and achieved the effect of high toughness and rapid degradation.
CN121133246BActive Publication Date: 2026-05-29YINJINDA (SHANGHAI) NEW MATERIALS CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- YINJINDA (SHANGHAI) NEW MATERIALS CO LTD
- Filing Date
- 2025-08-20
- Publication Date
- 2026-05-29
AI Technical Summary
Technical Problem
Existing PLA shrink films have poor toughness and slow degradation rate, making it difficult to meet environmental protection requirements.
Method used
A three-layer PLA shrink film with an A/B/A structure was prepared by using bio-based plasticizers and nano-silica combined with PEG-PLLA block copolymer and PBS as toughening agents through a specific stretching process, which enhanced toughness and improved degradation rate.
Benefits of technology
The process improved the toughness and degradation rate of PLA shrink film, reduced production costs, and increased product yield and heat shrinkage rate through stretch forming.
✦ Generated by Eureka AI based on patent content.
Smart Images
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Abstract
The application relates to the field of label heat shrinkage films, and particularly discloses a high-toughness PLA shrinkage film and a preparation method thereof. The shrinkage film is a three-layer structure of A / B / A, the total thickness of the three layers is greater than or equal to 20 microns, the raw material of the B layer is PLA, the proportion of the B layer in the whole shrinkage film is 0-100 wt%, when the proportion of the B layer is 0 or 100 wt%, the shrinkage film is a single-layer product; the raw material of the A layer is as follows in weight parts: 80-92 parts of PLA, 0.01-0.2 parts of a bio-based plasticizer, 3-10 parts of a toughening agent and 0.1-1 part of a nucleating agent. The application takes toughening as the core, combines blending and multi-function to improve the degradation rate of the PLA heat shrinkage film, the toughness defects of PLA molecules are improved through a specific toughening agent, the plasticizing efficiency, migration resistance, safety and degradation rate are improved through the bio-based plasticizer, and on this basis, the crystallization efficiency of the material is improved through the addition of the nucleating agent, so that the production time is shortened and the cost is reduced.
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