ABSTRACT

Aim of this study was to evaluate the effect of aluminium hydroxide and borates, separately or combined with ammonium polyphosphate (APP), upon the technological and fire properties of medium density fibreboard (MDF). Fire resistant MDF was fabricated in the laboratory from Scots pine (Pinus sylvestris L.) fibres bonded with a high molar ratio melamine-urea-formaldehyde resin. Overall, 24 h-swelling and water absorption properties of the treated boards were improved or remained unchanged compared to untreated ones. On the contrary, the internal bond strength (IB) of the fibreboards was significantly reduced up to 48%. The fire properties of the fibreboards were assessed by the determination of limiting oxygen index and cone calorimetry. As expected, the tested fire-retardants improved the fire resistance of the boards. Furthermore, the combination of aluminium hydroxide with ammonium polyphosphate considerably upgraded the fire retardancy while the incorporation of borates into APP showed much weaker effects.

摘要

本研究的目的是评估氢氧化铝和硼酸盐单独使用或与聚磷酸铵 (APP) 结合使用对中密度纤维板 (MDF) 的工艺和防火性能的影响。耐火 MDF 是在实验室中用欧洲赤松 ( Pinus sylvestrisL.) 纤维与高摩尔比的三聚氰胺-脲-甲醛树脂粘合。总体而言，与未经处理的板材相比，经过处理的板材的 24 小时溶胀和吸水性能得到改善或保持不变。相反，纤维板的内部粘合强度 (IB) 显着降低至 48%。通过测定极限氧指数和锥形量热法评估纤维板的防火性能。正如预期的那样，测试的阻燃剂提高了板材的耐火性。此外，氢氧化铝与聚磷酸铵的组合大大提高了阻燃性，而在 APP 中加入硼酸盐则效果较弱。