蒙脱土--DDAC复合防腐剂处理杨木的性能及表征
Properties and characterization of poplar wood treated with the montmorillonite-DDAC compound preservative.
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摘要: 为了提高人工林杨木的力学性能和耐腐性，采用蒙脱土（MMT）--二癸基二甲基氯化铵（DDAC）复合防腐剂（ODP），通过满细胞法处理杨木试材，分析了防腐处理材的增重率、DDAC保持量、有机蒙脱土（OMMT）在木材内部的分布、横纹抗压强度和耐腐性。结果表明：OMMT的引入使试材增重率增加，DDAC保持量下降；OMMT绝大部分以颗粒存在于木材导管腔中，部分尺寸较小的颗粒和剥离片层可以通过纹孔，很难进入细胞壁；ODP处理材的横纹抗压强度比蒸馏水处理材提高了27%；相对于DDAC处理材，ODP处理材的耐腐性比单组分DDAC处理材好。Abstract: In order to improve the mechanical properties and decay resistance of plantation grown poplars, the cathay poplar (Populus cathayana Rehd.) wood was treated with the montmorillonite (MMT)/didecyl dimethyl ammonium chloride (DDAC) compound preservative, using a full-cell process. The percentage of weight gain, retention of DDAC, distribution of organic montmorillonite (OMMT) in wood, compression strength perpendicular to the grain and decay resistance were determined. The results show that the percentage of weight gain increased with the introduction of OMMT, but the retention of DDAC decreased. Most of OMMT clusters infiltrating into the wood settled in wood cell lumen. A few small clusters and exfoliated layers passed through the pits, but could hardly infiltrate cell walls. Compared with wood samples treated with distilled water, the compression strength perpendicular to the grain of the samples treated with the compound preservative increased by 27%. The decay resistance of compound preservative treated samples also increased compared to those of DDAC treated samples.
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