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润湿性是木质材料的一个重要界面特性,它可以表征胶粘剂与木质材料接触状态,木材的表面润湿性能对木质复合材料的胶合强度有较大的影响。根据木质材料的结构与性能特点,笔者建立了描述其表面动态润湿性能的数学模型,在模型中提出了用系数K来评价胶的润湿性能;并运用该模型研究了脲醛树脂(UF)和酚醛树脂(PF)两种胶粘剂对杨木表面的动态润湿性能的影响,以及脲醛树脂胶对同一年轮内的早材和晚材的动态润湿性能,同时还研究了杨木表面自由能与其表面吸水量之间的关系。结果表明:与PF相比,UF在杨木表面的润湿性能较好,UF对早材的润湿性能比对晚材好;在相同时间内,杨木单位表面积吸水量越多,其表面自由能越大。
Wettability is an important interfacial property of woody materials. It can characterize the contact state between adhesive and woody materials. The wettability of wood has a great influence on the bonding strength of woody materials. According to the structure and performance characteristics of woody materials, the author established a mathematical model to describe the dynamic wettability of wood surface. In the model, the coefficient K was used to evaluate the wettability of the rubber. UF resin (UF) And phenolic resin (PF) on the dynamic wettability of poplar wood and the dynamic wetting properties of urea formaldehyde resin on the early wood and late wood in the same year round, and also studied the poplar wood surface free Relationship with the surface water absorption. The results showed that the wettability of UF was better than that of PF, and the wettability of UF was better than that of latewood. In the same time, the more water absorbed per unit area of poplar, the more its surface The greater the free energy.