Biodegradable graphene / PBAT composite packaging bag and preparation method thereof

By reacting rice husk ash with potassium hydroxide to generate graphene/calcium carbonate composite material, the strength and degradability issues of PBAT packaging bags are solved, achieving efficient biodegradation and resource utilization, and improving the overall performance of the packaging bags.

CN121801263APending Publication Date: 2026-04-07XIAMEN JINHUIFENG NEW MATERIALS CO LTD
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Patent Information

Application Number
CN202511560630.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-29
Publication Date
2026-04-07

AI Technical Summary

Technical Problem

PBAT has limitations in the application of packaging bags due to its poor crystallinity and low melt strength, which restricts its biodegradability and mechanical properties.

Method used

A graphene/potassium carbonate composite was generated by reacting rice husk ash with potassium hydroxide, and then reacted with lime milk to generate a calcium carbonate/graphene composite material. PBAT masterbatch was added, and the calcium carbonate/graphene/PBAT composite material was prepared by melt extrusion using a twin-screw extruder. This process was used to prepare a fully biodegradable graphene-based PBAT film and packaging bag.

Benefits of technology

It significantly improves the tensile strength and waterproof performance of PBAT, achieves efficient biodegradability, reduces production costs and environmental pollution, and makes resource-efficient use of agricultural waste, which is in line with the concept of circular economy.

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Abstract

The invention provides a biodegradable graphene / PBAT composite packaging bag and a preparation method thereof. The method comprises the following steps: S1, heating and calcining rice husks in an air furnace to obtain rice husk ash; s2, mixing the rice hull ash with potassium hydroxide, and reacting at 700-900 DEG C; s3, adding a product obtained in the step S2 into lime milk for full reaction, precipitating calcium carbonate among graphene, then filtering, cleaning to be neutral, and drying to obtain a calcium carbonate / graphene composite material; s4, blending the calcium carbonate / graphene composite material with a PBAT master batch, performing melt extrusion by using a double-screw extruder, performing air cooling, and performing pelletizing for standby application to obtain a calcium carbonate / graphene / PBAT composite master batch; and S5, preparing the full-biodegradable graphene-based PBAT film from the calcium carbonate / graphene / PBAT composite master batch by adopting a film blowing method, and then preparing the packaging bag.
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