浸注药剂热处理工艺对木材物理性能的影响

Treated wood physical properties after reagent-impregnation with heat-treatment technology

先用以氯化锌、磷酸二氢铵和复合铜盐为主要成分的3种药剂浸注马尾松Pinusmassoniana木材及桉树Eucalyptus木材，然后再进行热处理的工艺方法。通过对处理前后木材的力学性能和尺寸稳定性的比较，探讨了药剂在不同温度下对木材性能的影响情况。结果表明：热处理工艺能明显提高处理材的尺寸稳定性，但也会降低木材的抗弯强度（MOR）和抗弯弹性模量（MOE）值。在同一温度下，浸注药剂后的热处理材比对照热处理材的体积湿胀率变化值（ASE）值增大了10％-45％；同时，该工艺对浸注药剂后的处理材的抗弯强度值降低较明显，而抗弯弹性模量变化则相对较小。3种药剂中，氯化锌热处理改善尺寸稳定性的作用最明显，其对抗弯强度。

Three reagents （the main component of zinc chloride, ammonium dihydrogen phosphate, and a copper salt compound） were impregnated into Pinus massoniana wood and Eucalyptus wood which were heattreated at 160 ℃ 175 ℃, and 190 ℃. By testing mechanical properties and dimensional stability of untreated and treated woods, the effects of reagent type and target temperatures on wood properties were determined. Results showed that the heat treatment process improved dimensional stability of treated wood. For the same temperature the three reagents improved variation in the wood anti-shrink efficiency （ASE） by 10%-45% and then slightly reduced the mechanical properties; the modulus of rupture （MOR） decreased, but there was little effect on modulus of elasticity （MOE）. Among the three reagents, zinc chloride had the strongest effect on dimensional stability and the greatest impact on the MOR and MOE values. With an increase in temperature, mechanical properties decreased and dimensional stability （ASE value） increased gradually.