载银纳米TiO_(2)改性对橡胶木防霉性能的影响研究

Study on the effect of silver-loaded nano titanium dioxide modification on the anti-mold property of rubberwood

通过抑菌圈法探究不同浓度梯度载银纳米二氧化钛抑菌防霉剂对桔青霉、黑曲霉、白腐菌、密粘褶菌的抑菌效果,优化最佳抑菌浓度,然后选用该浓度改性剂对橡胶木进行常压浸渍处理,探究改性剂对橡胶木的防霉改性效果,并进行防霉改性机理分析。结果表明:载银纳米二氧化钛对黑曲霉、白腐菌、密粘褶菌有明显抑菌效果,对桔青霉的抑菌效果较差。随着载银纳米二氧化钛浓度的增加,白腐菌、密粘褶菌、桔青霉的抑菌圈直径呈增大趋势,黑曲霉的抑菌圈直径呈先增加后呈略微降低趋势,并优化得出最佳的抑菌浓度为10mg/mL,此时白腐菌、密粘褶菌、桔青霉、黑曲霉的抑菌圈平均直径分别为26.60mm、27.00mm、19.56mm、26.55mm;橡胶木经10mg/mL载银纳米二氧化钛改性剂浸渍处理后对黑曲霉、白腐菌、密粘褶菌的防治效力达到100%,对桔青霉的防治效力可达到85%以上,实现优异的防霉改性效果。

The antibacterial effect of silver-loaded nano titanium dioxide(TiO_(2))as an anti-mold agent with different concentration gradients on Penicillium citricola,Aspergillus niger,white rot fungus,and Gloeophyllum trabeum was investigated through the antibacterial circle method.The optimal antibacterial concentration was optimized,then the modifier with the best concentration was selected for atmospheric pressure impregnation treatment of rubberwood to explore the anti-mold modification effect of the modifier on rubberwood,and the anti-mold modification mechanism was analyzed.The results showed that silver-loaded nano titanium dioxide had significant antibacterial effects on Aspergillus niger,white rot fungus and Gloeophyllum trabeum,but had poor antibacterial effects on Penicillium citricola.With the increase of the concentration of silver-loaded nano titanium dioxide,the diameter of the inhibition zone of white rot fungus,Gloeophyllum trabeum and Penicillium citricola showed an increasing trend,while the diameter of the inhibition zone of Aspergillus niger exhibited an initial increase followed by a slight decrease trend.The optimal inhibition concentration was found to be 10mg/mL.At this time,the average diameters of the inhibition zones of white rot fungus,Gloeophyllum trabeum,Penicillium citricola,and Aspergillus niger were 26.60mm,27.00mm,19.56mm,and 26.55mm,respectively.After impregnation treatment with 10mg/mL silver-loaded nano titanium dioxide modifier,the prevention efficiency of rubberwood against Aspergillus niger,white rot fungus,and Gloeophyllum trabeum reached 100%,and over 85%against Penicillium citricola,achieving excellent anti-mold modification effect.