A bio-based polylactic acid compatibilizer, a preparation method thereof and a full bio-based polylactic acid composite

A bio-based polylactic acid compatibilizer was prepared by dynamic grafting reaction of bio-based itaconic acid diglycidyl ester with polylactic acid, which solved the problem of poor compatibility of polylactic acid materials, improved the interfacial compatibility and mechanical properties of composite materials, and achieved efficient and environmentally friendly material improvement.

CN119708454BActive Publication Date: 2026-05-26NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI
Filing Date
2024-12-06
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing polylactic acid (PLA) materials have compatibility issues when compounded with other materials, leading to interfacial separation and decreased mechanical properties. Furthermore, commonly used compatibilizers have low grafting rates, strong odors, and petroleum-based grafting monomers, which cannot effectively improve the performance of composite materials.

Method used

Bio-based itaconic acid diglycidyl ester was used as a grafting monomer and dynamically grafted with polylactic acid to prepare a bio-based polylactic acid compatibilizer. The compatibilizer was then melt-blended using a twin-screw extruder to prepare a fully bio-based polylactic acid composite material.

Benefits of technology

It improves the interfacial compatibility and mechanical properties of polylactic acid composite materials, with high grafting rate, high epoxy value, green and environmentally friendly material, and the compatibility effect is significantly better than existing technologies.

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Abstract

This invention belongs to the field of compatibilizer technology, and relates to a bio-based polylactic acid (PLA) compatibilizer, its preparation method, and a fully bio-based PLA composite material. This invention discloses a bio-based PLA compatibilizer and its preparation method. This invention also discloses a fully bio-based PLA composite material, the raw materials of which include PLA, plant powder and / or plant fiber, and a bio-based PLA compatibilizer. This invention uses a self-synthesized bio-based itaconic acid diglycidyl ester as a grafting monomer as the bio-based source for grafting with PLA. The resulting bio-based PLA compatibilizer exhibits excellent compatibility; furthermore, using the bio-based PLA compatibilizer to prepare a fully bio-based PLA composite material can improve the interfacial compatibility and mechanical properties of the PLA composite material.
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