Synergic flame-retardant effect of cellulose nanocrystals and magnesium hydroxide in polyurethane wood coating

In this paper, a wood coating based on waterborne polyurethane (WPU)/nano-cellulose crystalline (CNC)/Magnesium hydroxide (MH) was prepared. Efficient dispersion of MH in WPU in presence of 5 wt% of CNCs was observed by biological microscope leading to a material with improved esthetic, thermal and...

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Bibliographic Details
Published in:Journal of wood chemistry and technology 2022-07, Vol.42 (4), p.297-304
Main Authors: Cheng, Liangsong, Ren, Shaobo, Brosse, Nicolas, Ju, Zehui, Li, Suxia, Lu, Xiaoning
Format: Article
Language:English
Subjects:
Cellulose
Cellulose nanocrystals
Coating
Coatings
Fire resistant materials
flame retardancy
Flame retardants
Magnesium
Magnesium hydroxide
Mechanical properties
Nanocrystals
Polyurethane
Polyurethane resins
Pyrolysis
thermal stability
Thermogravimetric analysis
waterborne polyurethane
Weight loss
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Summary:In this paper, a wood coating based on waterborne polyurethane (WPU)/nano-cellulose crystalline (CNC)/Magnesium hydroxide (MH) was prepared. Efficient dispersion of MH in WPU in presence of 5 wt% of CNCs was observed by biological microscope leading to a material with improved esthetic, thermal and fire-retardant properties and mechanical performance. By thermogravimetric analysis (TG/DTG) and comparison with WPU, the maximum weight loss rate (RTmax) of WPU/CNC/MH coating decreased dramatically from 13.2 to 6.63, and the residue increased sharply from 4.69% to 40.55%. The results of pyrolysis combustion flow calorimeter (PCFC) showed that the flame-retardant performance of the composite coating is also greatly improved, and the peak of heat rate release (pHRR) being reduced from 350 w/g to 121 w/g. When applied to the wood panels, according to the Limiting oxygen index (LOI) experiment, for MH < 40 wt%, the combustibility grade is B2 level (combustible material), whereas for MH > 40 wt% the grade is B1 level (flame retardant material).
ISSN:0277-3813
1532-2319
DOI:10.1080/02773813.2022.2085748