Abstract
The hydrophilicity and flammability of fiberboards have limited their real-life applications. In this study, a facile strategy for preparing the multifunctional coatings with superhydrophobicity and flame retardancy on medium density fiberboards (MDFs) has been investigated. The superhydrophobic and flame-retardant coating on the MDF surface was obtained by depositing polydimethylsiloxane (PDMS) and 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane (FDTS)-modified Mg/Al layered double hydroxide (LDH) particles step by step. The as-prepared coating exhibited superhydrophobic properties with a water contact angle (WCA) of ~155° and good self-cleaning properties. Furthermore, the limiting oxygen index (LOI) value of the superhydrophobic MDFs increased by 60.4% as compared to that of the pristine MDFs, showing improved flame retardancy. The peak heat release rate (PHRR) and total heat release (THR) of MDFs decreased after coating with PDMS@FDTS-Mg/Al LDH, suggesting that the superhydrophobic coating decreased the fire growth speed and risk of fire hazard of MDFs. This coating with multiple functions opens a new avenue for the protection and functionalization of MDFs.
Highlights
Fiberboards have been widely applied in various fields, for example in furniture and interior decoration materials
Surface chemical composition mapping coated with PDMS@ FDTS-Mg/Al layered double hydroxide (LDH) were obtained by energy dispersive X-ray spectrometry (EDS)
The superhyrophobicity is commonly considered to be due to the synergistic effects of microa A refers to Mg/Al LDH. b B refers to FDTS-Mg/Al LDH
Summary
Fiberboards have been widely applied in various fields, for example in furniture and interior decoration materials. The fiberboards exhibit hydrophilic, hygroscopic, and flammable properties during application due to the existence of abundant hydroxyl groups in the wood fiber surface, their porous structure, and organic nature [3,4,5] This sensitivity to humidity changes and flame usually results in a decrease in the service life of fiberboards and a threat to the human safety. Chen reported a superhydrophobic coating with superparamagnetic property by a soft lithography method [19] These methods for fabrication of superhydrophobic surfaces on wood-based materials offer a new path for improving hydrophobicity of medium density fiberboards (MDFs). Guo prepared a superhydrophobic Mg/Al LDH coating with flame-retardant and smoke-suppression properties on wood via a two-step process.
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