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Influence of chemical treatment on chemical changes of fir wood

机译：化学处理对杉木木材化学变化的影响

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Many chemicals are used to prolong wood lifetime and protect wood against wood-destroying organisms and fire but there is not sufficient information about their possible corrosive effects on wood and its structural components from the perspective of long-term exposition in unsuitable condition. This study evaluated the combined effects of inorganic chemicals (borates, phosphates containing ammonia, sulphates with metal cations, chlorides) and wet-thermal accelerated ageing at temperature 80°C and relative humidity 65% for 30 days on chemical composition of treated wood. Used analyses indicated that selected chemicals cause a decomposition of all wood constituents in varying degrees. Cellulose was degraded in the greatest extent due to acidic sulphates (Fe~(3+), Cu~(2+)) and almost no deterioration of polysaccharides was caused with H_3BO_3 and NH_4Cl. A negative effect on lignin had Na_2B_4O_7.10H_2O, NaCl and Fe_2(SO_4)_3. At the same time the amount of extractives in hot water and acetone and ash content were compared at all samples. The wet-thermal ageing played an important role in wood degradation, but the effect of chemical treatment was certainly stronger.
机译：许多化学品用于延长木材寿命并保护木材防止木材破坏的生物和火灾，但是在不合适的条件下的长期阐述的角度，对木材及其结构部件可能的腐蚀性影响没有足够的信息。该研究评估了无机化学物质（硼酸盐，磷酸盐，硫酸盐，金属阳离子，氯化物）和在温度80℃和相对湿度的湿热时的综合作用，在经处理的木材的化学成分上持续30天。二手分析表明，所选化学品导致所有木材成分的分解在不同程度上。由于酸性硫酸盐（Fe〜（3+），Cu〜（2+）），纤维素在最大程度上降解，并且用H_3BO_3和NH_4CL几乎不会使多糖的恶化。对木质素的负面影响具有Na_2B_4O_7.10H_2O，NACL和FE_2（SO_4）_3。同时，在所有样品中比较热水和丙酮和灰分含量的提取物的量。湿热老化在木材降解中发挥了重要作用，但化学处理的效果肯定是强烈的。

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