1. A biomimetic structured bio-based flame retardant coating on flexible polyurethane foam with low smoke release and antibacterial ability.
- Author
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Meng, Dan, Wang, Kaihao, Wang, Wenjia, Sun, Jun, Wang, Haiqiao, Gu, Xiaoyu, and Zhang, Sheng
- Subjects
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URETHANE foam , *FIREPROOFING agents , *FOAM , *FERRIC oxide , *COAL combustion , *HEAT release rates , *FIREPROOFING - Abstract
Flexible polyurethane foam (FPUF) is widely used in our life, but it is inherent flammable. The demand for environmental-friendly multi-functional FPUF has been increasing rapidly in the last decade. In this work, a novel bio-based flame retardant coating was constructed by chemically reacting sodium alginate (OSA) and polydopamine (PDA) on the FPUF, followed by depositing nanorod-like β-FeOOH molecules through complexation reaction to form a biomimetic structure. The limiting oxygen index of the coated FPUF samples reached 25.5%. The peak heat release rate was reduced by 45.0%, and the smoke density of the coated sample was decreased by 69.1% compared to that of the control FPUF sample. It was proposed that the OSA-PDA-β-FeOOH decomposed during combustion to promote the formation of compact crosslinked char and released inert gases to dilute the combustible gases, and the β-FeOOH transferred to Fe 2 O 3 to settled the smoke particles reducing the smoke release. Furthermore, the coating with shark skin like structure endowed FPUF antibacterial ability because of its good superoleophobicity underwater. This work provided a novel strategy to construct a biomimetic multifunctional coating on the FPUF. [Display omitted] • A biobased coating was constructed on flexible polyurethane foam (FPUF). • The coating with a biomimetic structure improved the flame retardancy of FPUF. • The LOI of the coated FPUF reached 25% after washing and/or abrasion. • The coating decreased the peak smoke density of FPUF by 68.5%. • FPUF with superoleophobicity underwater showed antibacteria for cleaning application. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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