偶联剂对木材/岩棉纤维复合MDF性能的影响

Effect of Coupling Agent on Properties of Wood-Rock Wool Composite MDF

为了提高木材/岩棉纤维复合MDF的性能,通过将KH-550硅氧烷偶联剂喷施岩棉纤维表面以及将KH-550硅氧烷偶联剂直接与脲醛树脂胶黏剂混合,采用不同摩尔比的脲醛树脂制造木材/岩棉纤维复合MDF。研究了偶联剂用量、脲醛树脂摩尔比等对木材/岩棉纤维复合MDF静曲强度、内结合强度、甲醛释放量、氧指数等的影响。实验结果表明,1)KH- 550硅氧烷偶联剂可以有效提高木材/岩棉纤维复合MDF的静曲强度与内结合强度,当添加量为岩棉质量的0.5%时,两者分别可以提高12%与20%以上;2)KH-550硅氧烷偶联剂可以有效降低木材/岩棉纤维复合MDF的甲醛释放量,当添加量为岩棉质量的1.0%时,甲醛释放量可以降低50%以上;3)KH-550硅氧烷偶联剂对提高木材/岩棉纤维复合MDF的阻燃性没有明显贡献。

In order to improve the performances of the wood/rock wool medium density fiber board （ W/R - MDF）, the KH - 550 silane coupling agent was used to treat the rock wool and to mix with the urea - formaldehyde （UF） resin and several UF resins with different molar ratio were adopted to produce composite W/R - MDF. The effects of the amount of KH - 550 silane coupling agent and the molar ratio of UF resin on the mechanical properties, formaldehyde emission, and oxygen index（OI） of the W/R -MDF were studied. The experimental results indicated that 1 ） KH -550 silane coupling agent could enhance the static modulus of rupture（MOR） and the internal bond strength（ IB）of W/R - MDF effectively, and when the adding amount was 0.5% of the rock wool by weight, the former increased 12% and the later increased 20% ; 2） KH -550 silane coupling agent could reduce the formaldehyde emission of W/R - MDF effectively, and when the adding amount was 1.0% of the rock wool by weight, the reduction of the formaldehyde emission was more than 50% ; 3 ） KH -550 silane coupling agent could contribute little on flame resistance to the W/R - MDF.