预压缩速生杨木的动态润湿性  

Dynamic Wettability of Pre-compressed Fast-growing Poplar Wood

作　　者：韩书广[1] 黄润州[1] 周兆兵[1] 张洋[1] 

机构地区：[1]南京林业大学,南京210037

出　　处：《东北林业大学学报》2009年第9期112-114,共3页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(30671640);江苏省高校自然科学重大基础研究项目(05KJA22019)

摘　　要：采用润湿模型描述动态接触角(θ)在木质基材表面上的扩展过程,即定义一个K值来描述胶黏剂在木质基材表面上的动态润湿行为,并应用此模型分析了不同压缩工艺条件下脲醛树脂和酚醛树脂的湿润性能,此外,还比较了不同压缩工艺参数如压缩率、热压温度和热压时间对动态润湿性的影响。结果表明:润湿模型能够准确地描述胶黏剂在预压缩杨木表面的动态湿润过程。保压时间是对K值影响最为显著的因素,在杨木处理中更应该关注保压时间对界面性能的影响。Wettability of wood can be used to describe what happens on a wood surface when it comes into contact with an adhesive. A wetting model was developed to describe the wetting process of adhesives at the wood-based material surface. A K-value was used to evaluate the kinetics of wetting during the adhesive wetting process. Wettability of urea formaldehyde resin （UF） and phenol formaldehyde resin （PF） on pre-compressed poplar wood at different compressing process conditions was investigated by applying the wetting model. Moreover, the effects of different pre-compression parameters, such as compression ratio, platen temperature, and pressing time, on wettability of poplar wood were also compared. Results showed that the wetting model could accurately describe the dynamic adhesive wetting process on pre-compressed poplar wood surface. Pressing time had the most significant effect on the K value, which indicates that much attention should be paid to pressing time during poplar wood processing.

关 键 词：动态润湿性 杨木 压缩工艺 UF PF 

分 类 号：S781.33[农业科学—木材科学与技术]