超临界CO_2流体处理对木材浸注性的影响

Study of Influence on Wood Impregnation Treated with Supercritical CO_2 Fluid

采用不同压力、时间、温度的超临界CO2流体对轻木、木棉进行处理,测试试件的失重率和浸注后增重率,探究超临界CO2流体处理工艺条件对木材浸注性的影响。结果表明:经过超临界CO2流体处理的轻木和木棉增重率大于未经过处理的,超临界CO2流体处理能提高木材的浸注性;超临界CO2流体处理的压力、温度、时间对试件的失重率、增重率均有影响,但影响规律不同;在加入乙醇作携带剂后,试件的失重率均高于不加携带剂的,浸注试验的增重率也高于不加携带剂的处理。

Timber of Ochroma lagopus and Bombax malabaricum was treated with supercritical CO2 fluid under different pressure, time duration and temperature conditions, and the weight reduction rate （WRR）and the weight increase rate （WIR） post impregnation of the specimen were determined to explore the influence of technological conditions for supercritical CO2 fluid on the timber impregnation. The results showed that the WIR value of speci- men of both tree species treated with supercritical CO2 fluid was greater than that of the control, which indicated that the process of supercritical CO2 fluid treatment could improve the impregnation of the wood. The pressure, temperature and time duration of supercritical CO2 fluid treatment all inlfuenced on WRR and WIR values of the specimen, but the inluence pattern varied. The experiments also showed that when ethanol was added into the supercritical CO2 fluid as entrainer before impregnation treatment, both the WRR and WIR values of the specimen were higher than those of the control.