Abstract
Wood-based materials have attracted growing attention because of low cost and sustainability, whose application, however, has been limited by the mechanical performance and flammability of wood. Therefore, this work proposed a bio-based adhesive with flame retardant property. For this purpose, microcrystalline cellulose (MCC) was firstly modified to yield dialdehyde cellulose (DAC). Subsequently, the obtained DAC reacted with a synthesized hyperbranched PA6 N-melamine (PM) via a Schiff-base reaction, forming a covalent cross-linked polymer network, from which the bio-based adhesive (DPM) was derived. The phytic acid (PA), known for its flame-retardant properties, were then physically blended with the DPM to produce DPMP adhesive. Eventually, DPMP plywood was prepared by hot pressing. The dry bonding strength of the DPMP plywood reached 1.6±0.1 MPa when hot pressing temperature was 160 °C, compliant with the GB/T 17657–2013 standard (≥ 0.7 MPa). Furthermore, a coating was applied to the surface of poplar board by physically mixing PA with SiO2. Leveraging the cooperative flame retardancy of DPMP adhesive, the limit oxygen index (LOI) of DPMP/PA-SiO2 plywood impressively reached 38.5 %, with a total heat release reduced by 89.1 % compared to DPM plywood and the carbon formation rate as high as 48.7 %. This work presents a straightforward and ecologically sustainable approach for preparing flame-retardant wood suitable for use in furniture.
Published Version
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