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热处理条件对越南安息香木材耐软腐性的影响
TongThiPhuong,朱一辛,潘彪
0
(南京林业大学材料科学与工程学院,南京 210037; 越南林业大学木材科学与工程学院,河内 156204)
摘要:
研究了以水蒸汽为保护气体,温度170~210℃、时间2~6 h 为热处理条件下越南安息香木材的耐软腐性能、pH值变化,以及腐朽后木材细胞壁破坏情况。结果表明,随着热处理温度升高和热处理时间延长,越南安息香木材耐软腐性能提高;软腐试验后,失重率从未处理的33.52%减少至处理210℃,6 h时的1.60%。软腐菌的侵蚀导致木材的pH值增加,即酸性减弱;同时,pH值变化率随着木材受腐朽程度(失重率)增加而提高,未处理材的pH值提高了22.46%。随着热处理温度升高和热处理时间延长,木材软腐前后pH值的差异减小,pH值变化率从处理170℃,2 h时的22.43% 减少至处理210℃,6 h时的0.10%。与失重率变化趋势相似。软腐菌的侵蚀使越南安息香木材构造发生变异,受细胞腔中的软腐菌菌丝侵蚀细胞壁,在细胞壁上有很多V形穿孔槽。
关键词:  越南安息香  热处理  木材耐软腐性
DOI:10.13610/j.cnki.1672-352x.20140620.023
基金项目:江苏高校优势学科建设工程资助项目资助。
Effect of heat treatment on anti-soft rot of Styrax tonkinensis wood
Tong Thi Phuong,ZHU Yixin,PAN Biao
(College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037; College of Wood Science and Technology, Vietnam Forestry University, Hanoi 156204, Vietnam)
Abstract:
This research was to investigate the performance of soft rot decay resistance, pH value change, and cell wall degradation after decay of Styrax tonkinensis wood with different heat treatments. Heat treatment was carried out under water vapor condition at different temperatures(170℃ to 210℃) and time( 2 to 6 h). The results showed with increasing the temperature and time could increase the resistance of soft rot decay . After the soft rot decay test, the weight loss ratio changed from 33.52% of the untreated wood to 1.60% of heat-treated wood at 210℃ for 6 h. The wood pH was influenced by soft rot decay. Usually, the wood pH increases (acidity decreases) along with soft-rot decay erosion. The pH of the untreated wood increases by 22.46% compared to the treated wood. The pH change rate of soft rot decay wood tends to decrease with an increase of heating temperature and time. The pH change rate of soft rot decay wood changed from 22.43% to 0.10% when the treatment changed from at 170℃ for 2 h to at 210℃ for 6 h and a similar trend was found for the rate ofweight loss. Invasion of the soft rot fungi caused the wood structure change and degrade the cell wall of Styrax tonkinensis, resulting in many V-type notches on the cell wall.
Key words:  Styrax tonkinensis wood  heat treatment  wood anti-soft rot resistance

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