中文摘要：

在使用过程中，中密度纤维板（medium density fiberboard，简称MDF）及其产品物理力学强度出现降低，但甲醛释放似乎没有衰减。采用气候箱法，对MDF进行老化处理，跟踪测试MDF的理化指标，并用FTIR测试分析UF树脂的特征峰变化，揭示MDF理化指标的变化规律。红外光谱显示，试验结果表明，经过气候箱法老化处理后，MDF的物理力学性能迅速下降，尔后趋于稳定，而甲醛释放量（如）与循环周期（T）成指数关系。FTIR显示，与UF相比，MDF中的酰胺Ⅰ带含量逐渐降低，纤维与UF之间的结合在逐渐的分解，UF体形结构也开始破坏，导致MDF长期释放较多的甲醛。但老化处理，可以加速MDF中的甲醛释放。

英文摘要：

During using, the physics properties of medium density fiberboard would downgrade, but its formaldehyde emission wouldn＇t seemingly decay. The medium density fiberboard was aged in the climatic cabinet in order to disclose why it could emit formaldehyde for a long time. The results shows that the physics properties of medium density fiberboard rapidly lowered and hold to a number. And the formaldehyde emission and the ageing period was exponent relationship. The resin construct and bond of wood-UF were destroyed because the amido Ⅰ, which was mark weave of the UF resin, debased in the MDF aged by FTIR. So the MDF and its products could emit much formaldehyde enough to severely polluted room climate. What＇s more, the ageing method could speed-up emit formaldehyde in MDF and its products.