Antibacterial packaging material and preparation method thereof

By combining the layered metal oxide/bentonite composite with modified silica sol, antibacterial peptide and carboxylated chitosan, modified chitosan is prepared, combining polylactic acid and film-forming auxiliary materials to form antibacterial packaging materials, solving the problem that existing packaging materials cannot effectively isolate the air and cause food spoilage, and achieving efficient antibacterial and fresh preservation effects.

CN119350681BActive Publication Date: 2025-03-28HUNAN GREAT WALL MINGTAI NEW MATERIAL TECH CO LTD
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Patent Information

Application Number
CN202411936447.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-26
Publication Date
2025-03-28
Estimated Expiration
2044-12-26

AI Technical Summary

Technical Problem

Existing packaging materials cannot effectively isolate the air, resulting in food being prone to spoilage and deterioration during storage, and the traditional antibacterial agents are insufficient in heat resistance, safety and stability.

Method used

The layered metal oxide/bentonite composite is modified by sodium dodecyl sulfonate intercalation and surface modification, and then coupling reaction with silica sol, antibacterial peptide and carboxylated chitosan to prepare modified chitosan, combining polylactic acid and film-forming auxiliary materials to form antibacterial packaging materials.

Benefits of technology

This material has good antibacterial properties, mechanical properties, temperature resistance, weather resistance and barrier properties to oxygen and water vapor, which can extend the shelf life of food, reduce the use of preservatives, and improve food safety.

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Abstract

The present invention proposes an antibacterial packaging material and a preparation method thereof, and belongs to the technical field of packaging materials. After preparing a layered metal oxide / bentonite composite, it is modified by sodium dodecyl sulfate intercalation, and then the surface is modified by polydopamine, and the silica sol modified by a silane coupling agent and antimicrobial peptides are coupled with carboxylated chitosan to obtain modified chitosan, which is added into water with polylactic acid and film-forming auxiliary materials, homogenized, degassed, poured into a wet film, and dried, baked, rehumidified, and peeled to obtain an antibacterial packaging material. The antibacterial packaging material prepared by the present invention has good degradability, is safe and non-toxic, and is green and environmentally friendly, and has good antibacterial properties, mechanical properties, temperature resistance, and weather resistance, and has high barrier properties to oxygen and water vapor, good thermal stability, so as to extend the shelf life of food, reduce or even avoid the addition of preservatives in the food processing process, improve food safety, and has broad application prospects.
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