相对湿度、温度对胶合板甲醛释放的影响

摘要

测试了不同相对湿度、温度条件下密闭环境舱中胶合板释放的甲醛浓度,研究了相对湿度和温度对胶合板甲醛释放的影响规律.结果发现:开始3h内密闭舱内甲醛浓度迅速增加,之后7~8h甲醛浓度趋于平衡;相对湿度升高20%,密闭舱内甲醛平衡浓度增加了1.1~1.3倍;温度升高5℃,甲醛平衡浓度增加了1.3~2.5倍;利用变装载度法,求解了胶合板甲醛初始可释放浓度Cm,0、扩散系数Dm和界面气固分配系数 K,探讨了相对湿度、温度对各释放参数的影响,构建了相对湿度与温度影响参数模型,模型预测了不同环境条件下的胶合板甲醛释放参数,预测值与实验结果吻合良好.%Experiments of formaldehyde emission from plywood panels were conducted using the closed environment chamber at various relative humidity and temperature conditions, the influence rule of relative humidity and temperature on formaldehyde emissions of plywood panels was studied. The experiments showed that formaldehyde concentration in chamber increased rapidly during the early 3h, and reached equilibrium at 7~8h. Concentration of formaldehyde increased between 1.1~1.3 times for a 20% rise in relative humidity. A 5℃ increase in temperature could increase the emission by 1.3~2.5 times. The key parameters of formaldehyde emission, the initial mobile concentration,Cm,0, the material-phase diffusion coefficient,Dm, and the material/air partition coefficient,K, were calculated by using variable loading degrees. The effect of relative humidity and temperature on emission parameters was discussed, and the models about them were developed. The formaldehyde emission parameters of plywood panels at different environment conditions were predicted, and the simulated results matched the experimental data well.