Properties of strand board bonded with ammonium pentaborate (APB) modified phenol formaldehyde resin
Wei Gao, Jinzhen Cao
Ammonium pentaborate (APB) is combined with phenol formaldehyde (PF) resin in this study to develop a high-performance wood-based composite. The effect of APB and its combination with polyethylene glycol (PEG) on the physical, mechanical properties as well as formaldehyde emission of strand board were tested and compared with disodium octaborate tetrahydrateand (DOT) and zinc borate (ZB). The results showed that APB has negative effect on the mechanical properties of the strand board, but the distribution of APB only on the surface in the 3-layer strand board can reduce this negative effect significantly. Except only marginal increase on the thickness swelling, PEG displays a positive effect on internal bond strength, modulus of rupture (MOR), and modulus of elasticity (MOE). As expected, APB showed decreasing effect on the formaldehyde emission.