Fire‐retarding properties of nanowollastonite in particleboard

Abstract

Summary Effects of wollastonite nanofibers on fire‐retarding properties of particleboard were studied here. Nanowollastonite (NW) was applied at 5%, 10%, 15%, and 20% based on the dry weight of wood particles. The size range of wollastonite nanofibers was 30 to 110 nm. Two application methods of NW were used: surface application (SA) in which NW was mixed with a water‐based paint and sprayed on the specimens, and internal application (IA) in which NW was mixed with the urea‐formaldehyde resin. Density was kept constant at 0.68 g/cm3 for all treatments. Specimens of 150 × 130 × 9 mm were prepared, and fire‐retarding properties were measured using 2 apparatuses: slide fire test apparatus and fixed fire test apparatus. The obtained results indicated that most fire‐retarding properties were improved with the increase in NW content up to 15% when applied internally. More than this amount resulted in decreasing of properties that was partly due to the less wood‐chips content and partly due to the absorption of resin by the NW fibers. Surface application showed higher improving effects on the properties. It can be concluded that SA of NW is more effective in improving fire‐retarding properties of particleboard; furthermore, 10% of NW is recommended as an optimum level of consumption.

Improving Fire Retardancy of Beech Wood by Graphene

“…Painted specimens were closely clustered with the control specimens, indicating no significant difference between these two treatments. NW-painted specimens were in-between position of control and NG-painted; this indicated significant improving effects of NW on fire properties, similar to previous studies on solid wood and wood-composite panels [36,38]. However, the difference in clustering with NG-painted specimens showed higher effectiveness of graphene in improving fire properties in comparison to NW.…”

“…From another perspective, the high thermal conductivity in the in-plane direction prevented accumulation of heat at the point nearest to the piloted fire, eventually postponing its ignition. Similar transfer of heat to the surrounding area of woody specimens by nano-wollastonite was previously reported to improve fire properties as well [36,38]. Overall, the thermal conductivity of graphene in both directions helped its improving fire properties in beech specimens.…”

“…Therefore, the present research project was carried out to primarily find out if graphene may improve fire retardancy in beech, as an important industrial solid wood species. However, a parallel study was conducted with nano-wollastonite (NW), as a nano-material that has been reported to improve fire retardancy in both solid wood species and wood-composite panels [36][37][38], for comparison purposes. As the surface of wooden bodies and parts in buildings and structures are painted, graphene and NW were mixed with a popular water-based paint as a carrier of the nano-materials.…”

Improving fire retardancy of medium density fiberboard by nano‐wollastonite

“…[30][31][32][33][34] Nano-wollastonite was reported to significantly improve the biological resistance of wood and wood-based composites against wooddeterioratingfungi, 35,36 to improve thermal conductivity, physical and mechanical properties of wood-basedcomposites, 36 and to give promising results in lowering ignitability of wood and composites at high retention levels. [37][38][39][40][41] However, the authors came across little or no research projects studying the outcome of nano-wollastonite (NW) at lower levels. Therefore, the present research work was carried out to find out if lower contents of NW can have improving effects on fireproperties of medium-density fiberboard (MDF) as a vastly used wood-based composite around the world.…”

Effects of adding nano-wollastonite, date palm prunings and two types of resins on the physical and mechanical properties of medium-density fibreboard (MDF) made from wood fibres

“…Moreover, they provide raw materials for many other products and composites (Altuntas et al, 2017;Fernandes et al, 2017;Hubbe et al, 2017). However, it has also some drawbacks, like dimensional instability, vulnerability to biological deteriorating agents, and fire (Adamopoulos et al, 2012;Chan-Hom et al, 2017;Esmailpour et al, 2017;He et al, 2016;Hill, 2006;de Medeiros et al, 2016;Schmidt, 2006;Schmidt et al, 2016), and therefore, many modification methods were studied to overcome the drawbacks (Bastani et al, 2016;Hosseinpourpia et al, 2016Hosseinpourpia et al, , 2017Behr et al, 2017). One other drawback is that boards with large dimensions are not readily available at large quantities due to limitation in time and space for cultivation and harvesting of large trees (Fernandez-Puratich and Oliver-Villanueva, 2014; Andrade et al, 2016).…”