Dynamic wettability of wood surface modified by acidic dyestuff and fixing agent
Dynamic wettability of wood surface modified by acidic dyestuff and fixing agent
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DOI：
10.1016/j.apsusc.2011.05.072
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发表时间：
2012
影响因子：
6.7
通讯作者：
Shuangying Wei;Junyou Shi;J. Gu;Di Wang;Yanhua Zhang
中科院分区：
文献类型：
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作者：
Shuangying Wei;Junyou Shi;J. Gu;Di Wang;Yanhua Zhang
酸性染料可以给木材带来鲜艳的色彩，固色剂可以避免颜色损失。它们可以改变木材的表面润湿性，从而影响单板的粘合过程。在木材含水率较高的情况下，分别采用单组份湿固化异氰酸酯胶粘剂对稀有单板、酸性染料染色单板和壳聚糖固定染色单板进行胶合，并测量不同胶合界面的接触角（θ）。这些粘合界面的动态润湿性通过接触角 θ 和由 θ 计算的铺展渗透参数 (K) 来表征。结果表明，随着时间的延长，θ值显着减小，初始接触角（θi）随着单板含水率的增加而减小，但平衡接触角（θe）的变化与θi相反。当单板含水率相同时，稀有单板的θ变化最小，固定单板的θ变化最大。随着单板含水率的增加，这些胶合界面的K值均显着降低，但K的变化规律不同。描述动态润湿过程的润湿模型是在这些变化的基础上建立的。
Acidic dyestuffs can bring brilliant colors to the wood and fixing agents can avoid the color loss. They could change the surface wettability of wood, which impact the gluing process of veneers. In condition of the higher moisture content of wood, the rare veneers, the veneers dyed by acidic dyestuffs and the dyed veneers fixed by Chitosan were glued respectively by one-component wet-curing isocyanate adhesive and the contact angles (θ) of the different gluing interfaces were measured. The dynamic wettability of these gluing interfaces was characterized by both the contact angle θ and the spreading–penetration parameter (K) calculated by θ. The results showed that the θ-values decreased significantly with the extension of time and the initial contact angles (θi) decreased with the moisture contents of veneers increasing, but the variation of the balance contact angles (θe) was reversed with θi. When the moisture contents of veneers were same, the variation of θ of the rare veneers was minimal and the variation of θ of the fixed veneers was maximal. The K-values of these gluing interfaces all decreased significantly with the moisture contents of veneers increasing, but the variations of K were different. The wetting model describing the dynamic wetting process was established on the basis of these variations.