落叶松单宁处理杨木防腐性能

Decay Resistance of Poplar Wood Treated by Larch tannin

目的针对目前大多数传统木材防腐剂对环境和人畜的健康会产生诸多不利影响等问题,开发新的、安全性高、抗菌能力强并可自然降解的天然生物质木材防腐剂。方法采用超声波提取辅助法,从落叶松(Larix gmelinii(Rupr.)Kuzen)树皮中提取单宁,并以杨木为实验材料,对杨木进行浸渍处理,再用彩绒革盖菌和密粘褶菌接种浸渍12周,通过测定试样小木块的质量损失率和扫描电镜分析,评价其耐腐性。结果实验结果表明,单宁提取物对木材具有较明显的防腐效果,彩绒革盖菌和密粘褶菌接种的杨木试件平均质量损失率分别为4.36%和15.43%;其中当单宁提取物浸渍质量分数为5%时,对密粘褶菌的抑制效果最强。结论落叶松单宁对木腐菌有较强的抑菌活性,有效提高了木材的防腐性能。

In view of the problems that most traditional wood preservatives are harmful to the environment and humans and animals,this paper develops a new natural biomass wood preservative with high safety,strong antibacterial ability and natural degradation.Ultrasonic extraction assisted method is used to extract tannin from Larix gmelinii,and the poplar is used as the experimental material to impregnate the poplar,and then inoculated with Coriolus versicolor and Gloeophyllum trabeum for 12 weeks.The decay resistance of wood blocks is evaluated by measuring the mass loss rate and scanning electron microscope analysis.The experimental results show that the tannin extract has a significant antiseptic effect on wood.The average weight loss rates of poplar specimens inoculated with Coriolus versicolor and Gloeophyllum trabeum are 4.36%and 15.43%respectively.Among them,when the dipping concentration of tannin extract is 5%,the treated material has the strongest inhibitory effect on Gloeophyllum trabeum.Larix gmelinii has strong antibacterial activity against wood-destroying fungi,which can effectively improve the antiseptic properties of wood.