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Abstract
In this study, montmorillonite (MMT) was used as an inorganic synergist to prepare the water-based intumescent flame retardant (IFR) ornamental coating for plywood. Results indicate that the 7 wt.% MMT modified IFR coating (No. 3) possess the best fire resistance (longer than 20 min) of the tested samples according to the fire performance, which significantly declines the specific extinction area by 44.12 m2·kg−1 compared to the coating without MMT by cone calorimeter. In addition, characterizations such as XPS, XRD, TG, SEM and FTIR were characterized to investigate the surface and bulk properties as well as the morphology of MMT synergized water-based IFR coating. It is revealed that the residual nitrogenous polyaromatic structure and 25.5% residual mass in the No. 3 coating are a result of the effect of MMT on the antioxidation properties of the char layer.
Highlights
Wood has been widely used in production, construction, daily life and other activities for thousands of years due to its unique properties [1,2,3]
Some researchers found that the fire retardancy of wood and wood-based panels can be improved by nanotechnology [6,7]
There is a rising trend for the fire resistance as the amounts of MMT is increased to add to intumescent flame retardant (IFR) coating except for the excessive amounts of additions
Summary
Wood has been widely used in production, construction, daily life and other activities for thousands of years due to its unique properties [1,2,3]. The flammability of the wood can threaten the lives and properties of people, limiting its application [4,5]. Some researchers found that the fire retardancy of wood and wood-based panels can be improved by nanotechnology [6,7]. A coating method can effectively inhibit the further spread of the fire and does not impose restrictions on the physical and mechanical properties of substrates [8,9,10]. Water-based intumescent flame retardant (IFR) nanocoating, is more and more popular in the fireproof coating on wood. Water-based coating can lower the cost, reduce pollution, and improve the physical features of the building compared to solvent-based coating. IFR is used in polypropylene and ethylene-propylene-diene rubber [11,12]
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