Eco-friendly cellulose-montmorillonite coating for recyclable food packaging
A water-based, two-step coating process using cellulose 1-butyl imidazolium montmorillonite (CbimTf2N/MMT) delivers durable hydrophobic protection for food packaging. Inspired by seashell brick-and-mortar architecture, the coating is biodegradable, non-toxic, and maintains water resistance even under abrasion.
Overview
This solution introduces an eco-friendly coating for monolayer barrier applications in recyclable food packaging. The technology replaces conventional hydrophilic polyphosphate anions with hydrophobic bis(trifluoromethane sulfonyl)imide anions to create a cellulose 1-butyl imidazolium montmorillonite (CbimTf2N/MMT) composite. Applied through a two-step aqueous painting process, the coating imparts durable hydrophobicity to packaging substrates, including cotton pulp and other cellulosic materials. Notably, the coating's water-repellent performance improves with increased friction, making it well suited for packaging that experiences handling wear. The approach is fully water-based, avoiding harmful solvents, and the resulting coating is biodegradable and non-toxic, supporting circular packaging goals.
Technical specifications
- Material composition: Cellulose 1-butyl imidazolium montmorillonite (CbimTf2N/MMT), a composite combining cellulose ionic liquid with montmorillonite clay.
- Anion exchange: Hydrophilic [PP]− replaced with hydrophobic [Tf2N]− to enhance water stability.
- Application method: Two-step aqueous painting process — spray-coat MMT/CbimPP dispersion, dry, apply LiTf2N solution, dry, and rinse.
- Processing conditions: 10 wt% CbimPP in MMT/CbimPP dispersion, ultrasonic processing at 130 W, centrifugation at 8000 rpm, drying at 70 °C for 2–6 hours.
- Performance characteristics: Maintains coating integrity after prolonged water exposure; retains hydrophobicity under extensive abrasion and scraping.
- Bio-inspired design: Mimics the brick-and-mortar layered structure of seashells, combining rigid mineral layers with polymer binders for mechanical resilience.
- Environmental profile: Biodegradable, non-toxic, and free of harmful organic solvents.
Technology readiness level
The coating concept has been demonstrated in published laboratory-scale studies validating hydrophobicity, abrasion resistance, and water stability on packaging-relevant substrates. Future validation will focus on refining the spray-coating process parameters, scaling the two-step aqueous application to larger packaging formats, and confirming biodegradability and non-toxicity under industry-relevant conditions. The technology is at an early-to-mid stage of development, suitable for collaborative pilot trials and sponsored research to advance toward commercial packaging applications.
About Yonsei University
Yonsei University is a comprehensive private research university based in Seoul with an additional international campus in Songdo, combining a broad academic enterprise with a major clinical footprint. For industry, co-located academic and clinical facilities enable problem-driven collaboration from early discovery through validation, and shared core labs and prototyping spaces streamline testing. The Songdo campus sits within the Incheon Free Economic Zone’s biomanufacturing hub, giving partners proximity to large‑scale production and a dense supplier network. Research is supported by competitive national funding through the National Research Foundation of Korea and relevant ministries, and a dedicated technology transfer office manages IP, licensing, and startup formation.
Inquire about this partnering listing
Looking for
Industry applications
delivered to your inbox.