不同固含量低分子酚醛树脂浸渍改性杉木板材性能的研究

为改善杉木的物理力学性能，采用真空-加压浸渍工艺，对速生杉木进行低分子酚醛树脂增强改性处理，分析不同树脂增重率对改性杉木性能的影响，以及树脂在木材长度和厚度方向上的分布特点。结果表明，杉木经过固含量为10％、20％、30％的酚醛树脂浸渍处理后，其尺寸稳定性随树脂固含量的增加逐渐提高，静曲强度由64.5 MPa提高至75.0 MPa，弹性模量和表面硬度分别提高了6.1％、27.5％、48.2％和29.8％、63.1％、73.8％，但冲击韧性随着树脂增重率的增加而逐渐降低；树脂在木材长度方向上分布均匀，在厚度方向上木材表面多于其内部。

The Effects of Phenol Formaldehyde Resin Impregnation on the Main Physical and Mechanical Properties of Cunninghamia lanceolata Lumber

To improve the physical and mechanical properties of Cunninghamia lanceolata wood lumber,low molecular weight phenol formaldehyde resin was impregnated into the lumber via a “vacuum-pressure”process. The distribution characteristic of resin was investigated in the length and thickness directions.The results showed that the dimensional stability of Cunninghamia lanceolata had increased gradually after impregnating with the 10%, 20%,30% concentrations of PF resin.The modulus of rupture remained unchanged after it increased from 64.5 MPa to 75 .0 MPa.The modulus of elasticity and hardness were increased by 6.1%,27.5%,48.2% and 29.8%、63.1%,73.8%,respectively.However,the impact toughness of Cunninghamia lanceolata decreased gradually with the increase of weight gain rate of resin.In the length direction,the resin distributes uniformly.In the thickness direction,the content of resin in the edge is more than that in the inside.