Biomass-derived phas-based oil and moisture barrier coating, coated paper and methods of making

By using biomass-derived PHA oil-blocking and moisture-permeable coatings and a double-layer coating design, the problems of poor environmental protection and performance of existing paper material coatings have been solved, achieving a synergistic improvement in oil-blocking and moisture-permeable performance and coating stability.

CN121272776BActive Publication Date: 2026-06-09ZHEJIANG RUIWEI NEW MATERIAL TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202511600900.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-11-04
Publication Date
2026-06-09
Estimated Expiration
2045-11-04

AI Technical Summary

Technical Problem

Existing oil-blocking and moisture-permeable coatings for paper materials mostly rely on petrochemical-based raw materials, resulting in poor environmental performance, difficulty in achieving a balance between oil-blocking and moisture-permeable properties, and the coatings are prone to cracking and have insufficient adhesion.

Method used

A biomass-derived PHA oil-blocking and moisture-permeable coating is adopted, which includes biomass-derived polyhydroxy fatty acid ester, biomass-based crosslinking agent, chitosan-coated SiO2 nanoparticles and bio-derived film-forming aid. A double-layer coating structure is designed, and the stability and performance balance of the coating are ensured by pretreating the substrate paper with bio-enzymes and using a gradient drying process.

Benefits of technology

It achieves synergistic optimization of the oil-blocking and moisture-permeable properties of the all-biomass environmentally friendly coating, with strong coating adhesion, good durability, and suitable for use in food packaging and other scenarios.

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Abstract

Biomass-derived PHA oil-repellent and moisture-permeable coating, coated paper and preparation method, relate to the field of paper and paperboard manufacturing and processing. The coating contains biomass-derived polyhydroxyalkanoate, maltodextrin grafted adipic acid dihydrazide, chitosan-coated SiO2 nanoparticles, tributyl citrate and deionized water; the coated paper comprises a substrate paper pretreated by a biological enzyme and a double-layer coating formed by the coating; the preparation method comprises the steps of modified PHA emulsion preparation, substrate paper pretreatment, double-layer coating and gradient drying. The reagents used are environmentally friendly, and the product has excellent oil-repellent and moisture-permeable properties.
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