摘要： 利用微波技术对聚乙烯醇(PVA)/MgO-Al2O3水溶液进行干燥,在此基础上建立了涂层的水分扩散系数的一维数学模型。通过实验系统分析了PVA/MgO-Al2O3涂料的干燥特性,结果显示:随着微波输出功率和涂层厚度的变化,有效水分扩散值介于0.042 9×10-10~17.485 5×10-10 m2 ·s-1之间。最后,利用对数形式计算了干燥的活化能。水分扩散模型的建立为强化涂层干燥提供了理论基础。
关键词:
微波干燥,
水分扩散,
涂层
Abstract: This paper dealt with the coating drying process of the aqueous solution of PvA (Poly vinyl alcohol)/Mgo-Al2O3 by using microwave technology. Thus a one-dimensional mathematical model of the water diffusion coefficient through the coating layer was formed. The drying characteristics of the PVA/ MgO-Al2O3 aqueous solution were analyzed through the experimental system. With the variations of microwave output power and coating thickness, the effective moisture diffusivity values ranged from 0.00.042 9×10-10 to 17.485 5×10-10 m2 ·s-1. The activation energy was calculated using an exponential expression. It provided a theoretical basis for enhancement of drying process.
Key words:
microwave drying,
moisture diffusion,
coating layer
杨金富, 王火印, 毕向光, 彭金辉, 刘秉国. 微波干燥聚乙烯醇/MgO-Al2O3涂层的水分扩散模型[J]. 涂料工业, 2013, 43(12): 19-24.
Yang Jinfu, Wang Huoyin, Bi Xiangguang, Peng Jinhui, Liu Bingguo. The Water Diffusion Model of PvA (Poly Vinyl Alcohol)/MgO-Al2O3 Coating Under Microwave Drying[J]. Paint & Coatings Industry, 2013, 43(12): 19-24.