Mk. Yalinkilic et al., EFFECT OF BORON ADDITION TO ADHESIVE AND OR SURFACE COATING ON FIRE-RETARDANT PROPERTIES OF PARTICLEBOARD/, Wood and fiber science, 30(4), 1998, pp. 348-359
Citations number
40
Categorie Soggetti
Materiales Science, Textiles","Materials Science, Paper & Wood",Forestry
Boron added to urea formaldehyde (UF) resin during manufacture of boar
d from waste tea leaves was combined with a fire-retardant coating sys
tem containing boron to further reduce combustibility. Boric acid (BA)
and borax (BX) were used as boron compounds separately or in a mixtur
e of 5:1 (BA:BX, w/w) in aqueous solutions of UF resin. A BA + BX mixt
ure was also added to a 40% aqueous solution of trimethylolmelamine (T
MM) (as a binding agent) and applied to the board surface. Fire-retard
ant properties were determined according to the Japanese Industrial St
andard JIS A 1322. Thickness swelling and water absorption levels were
not changed remarkably by boron addition to UF resin, while static be
nding and internal bond strengths were reduced to some extent. However
, EX addition suppressed the adverse effect of BA on board strength, p
robably by buffering its acidic pH to almost neutral levels, while BA
reduced the glowing or smoldering effect of EX. Panels with or without
added boron showed no ignition after the flame source was cut off aft
er 13 min. Surface coating with the boron-added TMM improved fire reta
rdance. To limit the reduction of strength properties due to boron add
ition to the resin, fire-retardant surface coating can be applied to i
mpart a required level of fire protection.