A nanocomposite biodegradable film for composting mulch and its preparation method

By selectively distributing nanofillers in the PBAT/PLA cocontinuous phase, the constraint between gas barrier properties and water vapor permeability in existing films has been resolved, achieving a synergistic improvement in gas barrier properties, moisture permeability, odor barrier properties, and mechanical properties, thus meeting multiple performance requirements for composting mulch.

CN122278152APending Publication Date: 2026-06-26CHANGZHOU BOJIANG NEW MATERIAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHANGZHOU BOJIANG NEW MATERIAL TECH CO LTD
Filing Date
2026-04-30
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In existing PBAT/PLA biodegradable films used for composting, there is a constraint between gas barrier properties and water vapor permeability, making it difficult to simultaneously achieve synergistic improvements in gas barrier properties, moisture permeability, odor barrier properties, and mechanical properties. Furthermore, the distribution of nanofillers in the blend system lacks targeted regulation.

Method used

By achieving phase-selective distribution of nanofillers in the PBAT/PLA cocontinuous phase morphology, organically modified montmorillonite and carboxyl-functionalized nano-silica are distributed in the PLA phase, while alkylsilane-modified clinoptilolite is distributed in the PBAT phase, forming a functionally partitioned micro-mass transfer structure. This is then combined with a chain extender to prepare a nanocomposite film.

Benefits of technology

The gas barrier properties and moisture permeability are relatively independently controlled in a single film, effectively reducing the gaseous loss of nutrients such as nitrogen, while maintaining good mechanical properties and biodegradability.

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Abstract

This invention discloses a nanocomposite biodegradable film for composting mulch and its preparation method. The film comprises, by weight, 40-55 parts PBAT, 40-55 parts PLA, 0.3-2 parts PLA-g-MA, 2-6 parts organically modified montmorillonite, 1-3 parts carboxyl-functionalized nano-silica, 1-4 parts alkylsilane-modified clinoptilolite, and 0.5-1.5 parts chain extender. In the film, the PBAT and PLA phases form a co-continuous structure. The organically modified montmorillonite is enriched in the PLA phase to form gas-blocking channels, while the carboxyl-functionalized nano-silica and alkylsilane-modified clinoptilolite are enriched in the PBAT phase to construct moisture-permeable channels and ammonia chemical trapping sites, respectively. The preparation method employs a two-step masterbatch process to ensure selective distribution of the filler phases, and a film with a thickness of 30-45 μm is obtained through blown film forming. The film of this invention has good gas barrier properties, water vapor permeability, selective ammonia barrier ability and mechanical properties. It is suitable for use in the entire life cycle of composting and can be degraded and returned to the field after composting.
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