High-strength and high-toughness polylactic acid composite material and preparation method thereof

By blending modified cellulose nanocrystals and modified montmorillonite with polylactic acid, the problems of brittleness, heat resistance, and melt strength of PLA materials were solved, and a high-strength, high-toughness, and heat-resistant biodegradable composite material was prepared.

CN120737569BActive Publication Date: 2026-05-01ZHEJIANG HUIJING NEW MATERIAL CO LTD
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Patent Information

Application Number
CN202511055305.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-07-30
Publication Date
2026-05-01
Estimated Expiration
2045-07-30

AI Technical Summary

Technical Problem

Polylactic acid (PLA) materials suffer from high brittleness, poor heat resistance, low melt strength, and easy hydrolysis and degradation, making it difficult to meet the toughness requirements of packaging materials, automotive interiors, and other applications.

Method used

Modified cellulose nanocrystals and modified montmorillonite were blended with polylactic acid (PLA). The compatibility between cellulose nanocrystals and PLA was improved by the synergistic modification of tannic acid and octadecylamine. Modified montmorillonite was used to expand the interlayer spacing, promote the intercalation of PLA molecular chains, form an interlocking network, and enhance the interfacial bonding force.

Benefits of technology

A high-strength, high-toughness, and good heat-resistant polylactic acid composite material has been developed, while maintaining biodegradability. At the same time, the preparation process is environmentally friendly and cost-controllable.

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Abstract

This invention relates to a high-strength, high-toughness polylactic acid (PLA) composite material and its preparation method, belonging to the field of biodegradable polymer materials technology. The PLA composite material formulation is as follows: by weight, 70-80 parts PLA, 5-10 parts modified cellulose nanocrystals, 3-5 parts modified montmorillonite, 1-2 parts plasticizer, and 0.5-1.5 parts antioxidant. The preparation method of the modified cellulose nanocrystals is as follows: cellulose nanocrystals are added to deionized water and ultrasonically treated to obtain dispersion A; a 0.5-1 M tannic acid solution at 60°C is added sequentially to dispersion A; after cooling to room temperature, a 3 M octadecylamine-ethanol solution is added dropwise; the mixture is washed with ethanol and deionized water, and then subjected to stepwise freeze-drying to obtain the modified cellulose nanocrystals. The PLA composite material prepared by the method of this invention exhibits high strength, high toughness, and good high-temperature resistance.
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