Coating for water- and oil-resistance paper

A recently conducted study portrays a cellulose nanofibrils/polydimethylsiloxane double-layer coating for fabrication of high barrier and excellent water- and oil-resistance paper.

A paper bag with rice.
Test results highlight the great potential of tung oil photopolymerisable coating formulations as a simple and promising alternative for the fabrication of more sustainable and functional paper packaging materials.  Image source: congerdesign - Pixabay (symbol image).

Paper-based packaging materials have attracted much attention due to their biodegradability, non-toxicity and renewability. However, traditional paper with poor water- and oil-repellency limits its application in food packaging. In the new study, traditional paper coated with cellulose nanofibrils (CNF) and a mixture of polydimethylsiloxane (PDMS) & CNF microparticles (CNFmp) became a hydrophobic and oleophobic paper-based material. The layer of CNF coated on the paper can fill the porous on surface to improve the barrier, and the hydrophilicity of this layer contributed to resistance to oil.

Food packaging

The paper exhibited excellent tensile strength, high hydrophobicity, oil-resistance and gas barrier. According to te researchers, their work has great potential for preparing high barrier, fluorine-free, and water- and oil-resistant materials in the food packaging field.

The study has been published in Progress in Organic Coatings, Volume 172, November 2022.

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