Study On Application Of CuAz Wood/bamboo Preservative And Its Properties Evaluation

Wood/bamboo preservation is an important issue of current wood industrial development. Preservatives traditional environmental problems urgently calls for the development of new preservatives with high efficient and low toxicity. Copper Azole Preservative is a new kind of preservative product. This paper studies on the CuAz preservatives antifungi properties, environmental safety performance, and fixation performance evaluation. The application of CuAz preservatives on preserving ancient architecture and bamboo preservation is also studied. The results are as follows:(1) Antibacterial propertiesIn this study, the toxicity of CuAz preservatives on decay fungi is tested by accelerated test and field trial of wood, the result showed that antifungi properties of CuAz preservatives and CCA-C and ACQ-B are quite equal, and obviously superior to organic acids preservatives. Meanwhile, examine the form toxicological action of preservatives on the wood decay fungi and effect on fungi protein, binding forms of toxicological role and protein electrophoresis results of the change, can analyze the inhibitory role of the pharmacy which is likely to affect the pharmaceutical fungi related to the regulation of DNA synthesis gene expression, thus prevented the protein and enzyme synthesis, so that the bacteria inhibited DNA synthesis affected the fungi cell division required certain proteins, inhibit certain normal cell growth associated protein and enzyme gene expression and the final result is cell disintegration, and even death.(2) Environmental safety performanceThe safety of preservatives is evaluated by using the LD50 value of animal toxicity testing. For two CuAz preservatives, animal poisoning is mainly copper. Acute toxicity LD50 values of two CuAz prescriptions were 1228.7±146.6mg/kg, 2072.5±180.8mg/kg respectively. According to chemical substances in acute toxicity grading standards, are low toxicity. For CCA preservatives, poisoning mainly is caused by arsenic and chromium. LD50 values of acute toxicity are 440.68±32.82mg/kg. According to chemical substances in acute toxicity grading standard, CCA preservative belongs to a moderately toxic.(3) Fixation performance evaluationIn this study, bamboo and Masson pine for the experimential materials, The fixation rate of CuAz preservatives was measured, the results showed that the fixation rate of CuAz was better than CC, CO and CM and other organic acids preservatives; with the average level of ACQ. For CuAz preservatives, Ffixation performance of CuAz preservatives without boron was superior to pharmaceutical Boron. FTIR sprctra analysis of bamboo powder, bamboo lignin and bamboo holocellulose through chemicals around showed that interaction between CuAz preservatives and bamboo occurred in hemi-cellulose and lignin. Adsorption of copper is the main location of the carboxyl hemi-celluloses and lignin, products by interaction, which are mainly copper-oxygen and copper–carboxylate complexes bondings.