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动态润湿性是木质材料的一个重要界面特性,用于描述胶黏剂在木材表面上的润湿行为。笔者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,模型中利用参数K值来描述胶黏剂在木质基材表面上的动态润湿行为。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;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。在预压过程中,保压时间是对K值影响最为显著的因素。
Dynamic wetting is an important interface characteristic of woody materials and is used to describe the wetting behavior of adhesives on wood surfaces. The wetting model is used to describe the dynamic contact angle (θ) expansion process on the surface of wood substrates. The parameter K is used to describe the dynamic wetting behavior of the adhesive on the surface of wood substrates. The wettability of UF resin and phenolic resin under different compression conditions was analyzed by using this model. The effects of different compression parameters such as compression ratio, hot pressing temperature and hot pressing time on dynamic wettability were compared. The results show that the wetting model can accurately describe the dynamic wetting process of the adhesive on the pre-compressed poplar wood. In the pre-pressure process, dwell time is the most significant factor on the K value.