MDF甲醛释放流变性的研究

在MDF甲醛释放蠕变过程中,MDF甲醛释放驱动力保持不变时,MDF甲醛释放量随时间延长而变化。马克斯韦模型可在甲醛释放驱动力为恒定条件下,较好地模拟MDF的甲醛释放流变性的规律;凯尔文模型较好地模拟了MDF甲醛延时释放特征;勃格模型是描述MDF甲醛释放蠕变的重要公式,它较好地模拟了MDF甲醛常规释放蠕变特征,换算得到的公式可较好地描述锯切后试件放置时间对MDF甲醛释放量的影响规律,是描述和预测MDF甲醛释放松弛特性的有价值模型;也可较好地描述干燥器测试时间对MDF甲醛释放量的影响规律,是描述和预测MDF甲醛释放蠕变特性的有价值模型。

Study on the Rheological Mechanism of Formaldehyde Emission from MDF

The behavior of formaldehyde emission from medium density fiberboard (MDF) is a function of time elapsed. However, the correlation between formaldehyde emission and the time elapsed is still not clear yet. Here the behavior of the formaldehyde emission from MDF was modeled using the rheological theory. Formaldehyde Emission from MDF was divided into three components of instantaneous, time delayed and permanent when the driving force of formaldehyde emission from MDF is set to be fixed. The Maxwell model, Kelvin model, and Burger model were used to curve-fit the three different time-related components, individually. The results show that the effects of the time on the three different time-related components of formaldehyde emission from MDF can be well modeled by the Maxwell, Kelvin, and Burge formulae.