论文部分内容阅读
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。
The water-vapor as the protective gas, the temperature of 170 ~ 210 ℃, the time of 2 ~ 6 h under heat-treated Vietnam Sabouraud wood soft rust resistance, pH value changes, and decayed wood cell wall damage. The results showed that the softening resistance of benzoin in Vietnam increased with the increase of heat treatment temperature and the prolongation of heat treatment time. After soft-rot test, the rate of weight loss decreased from 33.52%, which was never treated, to 210% at 210 ℃ and 1.60% at 6 hours. The erosion of soft rot fungi led to the increase of the pH value of the wood, that is, the acidity decreased. At the same time, the rate of pH change increased with the degree of decay of the wood (weight loss rate), and the pH of the untreated material increased by 22.46%. With the increase of heat treatment temperature and the prolongation of heat treatment time, the difference of pH value before and after soft soft rotation was decreased. The rate of change of pH value decreased from 22.43% at 2 h at 170 ℃ to 210 ℃ at 2 h and 0.10% at 6 h. Similar to the changing trend of weight loss rate. Erosion of soft rot fungi Vietnam benzoin wood structure variation occurs, by the cell cavity of soft rot fungus mycelium erosion cell wall, there are many V-shaped cell walls in the perforation groove.