A PBAT / bamboo powder biodegradable composite masterbatch, its preparation method and composite film

By modifying bamboo powder and introducing new volume-enhancing grafting agents, the problems of poor compatibility, dark color and poor water-oxygen barrier properties in bamboo powder and PBAT composite materials are solved, and the excellent performance and good appearance of the composite film under high bamboo powder addition are achieved.

CN120082181BActive Publication Date: 2025-07-29INT CENT FOR BAMBOO & RATTAN +1
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Patent Information

Application Number
CN202510571710.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-05-06
Publication Date
2025-07-29
Estimated Expiration
2045-05-06

AI Technical Summary

Technical Problem

Bamboo powder and PBAT composites have problems such as poor compatibility, low effective amount of bamboo powder, dark color of products, and poor water and oxygen barrier properties, which affect the mechanical properties and appearance quality of the composites.

Method used

By modifying bamboo powder, a new volume-enhancing grafting agent is introduced, and synergistically works with other additives, PBAT/bamboo powder biodegradation composite masterbatch is prepared, which improves the dispersion and compatibility of bamboo powder in the PBAT matrix, enhances interface adhesion, combines blockers and barriers to solve the problems of discoloration and water-oxygen barrier.

Benefits of technology

Under the high amount of bamboo powder addition, the composite film maintains excellent comprehensive performance and good appearance, light color, good water-oxygen barrier properties, and excellent mechanical properties.

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Abstract

The present invention belongs to the technical field of biodegradable materials, and relates to a PBAT / bamboo powder biodegradable composite masterbatch, its preparation method and composite film. The composite masterbatch comprises the following raw materials in parts by mass: 100 parts of PBAT, 10 - 30 parts of modified bamboo powder, 5 - 10 parts of compatibilizing grafting agent, 0.5 - 1 part of retarder, 20 - 30 parts of barrier agent, and 0.2 - 0.4 part of chain extender; the modified bamboo powder is obtained by impregnating bamboo powder with an inorganic alkali solution and modifying it with an acyl halide reagent; the compatibilizing grafting agent is obtained by subjecting PBAT to ultraviolet grafting modification with a grafting agent, and the grafting agent is a compound of a carboxyl-containing acrylate and glycidyl unsaturated fatty acid ester in a mass ratio of 1:(1 - 2). The present invention modifies bamboo powder and introduces a novel compatibilizing grafting agent, improving the hydrophobicity, dispersibility and compatibility with PBAT of bamboo powder. The obtained composite film has good appearance, high water and oxygen barrier properties and good mechanical properties.
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