Article: Production of High-Solid-Content Fire-Retardant Phosphorylated Cellulose Microfibrils

The overall target of the FireCellCoat project is to develop bio-based wood coatings for improvement of fire resistance.  The recent publication of our partner VTT titled “Production of high-solid-content fire-retardant phosphorylated cellulose microfibrils” presents one of the approaches used in the project to produce bio-inspired wood coatings, which is based on phosphorylation of high-consistency cellulose microfibrils (MFC). In the paper, Dr. Alexey Khakalo and co-authors present an alternative method for production of phosphorylated MFC at notably high solids content of 25% with low energy consumption (0.6 MWh/ton) using enzyme-aided mild mechanical treatment combined with effective mixing of the fibrillated material with the phosphorylation chemicals and curing of the slurry at elevated temperature. The casted films prepared from the phosphorylated MFC demonstrated both improved flame retardancy as well as self-extinguishing properties. According to Dr. Khakalo, these results are the first step towards development of fire-resistant wood coatings based on high-consistency MFC. The combination of phosphorylated MFC and pigments as layered coating structures are going to be tested next.

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