MOKUZAI HOZON (Wood Protection)

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Three full scale models of wood sound barrier walls were made either of DDAC or CUAZ pressure-impregnated, or untreated sugi (Cryptomeria japonica D. Don) wood, and a half of each wall surface was finished with five wood preservative semitransparent coatings (3 water-borne and 2 solvent-borne). The wall models were then weathered for 108 months (9 years) at 90 degrees facing south and north in Tsukuba, and the effects of wood preservative treatments on the weatherability of coatings were examined. Service life of most coatings lasted for more than 108 months in the case of CUAZ-treated wood and coating performance decreased in the order: CUAZ-treated > DDAC-treated> untreated wood. Color stability also decreased in the same order, and several coatings applied on CUAZ-impregnated wood showed an excellent color stability, E ^*_ab less than 7, during 108 months. These results indicate that long-term weatherability of wood coatings was improved when they were applied on CUAZ or DDAC-impregnated wood. It is also suggested that a maintenance cycle of wood wall coating as long as 10 years can be achieved by using a good combination of wood preservatives and wood preservative semitransparent coatings.

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The characteristic of Mikeblock granule was studied in the laboratory and field trials. Regarding Mikeblock and the active ingredient dinotefuran, repellency and transfer efficacy tests were conducted in the laboratory. The results of these tests showed that Mikeblock was non-repellent termiticide and had the equal transfer efficacy compared to other termiticides. Field efficacy test was conducted to evaluate the effective term of Mikeblock granule and also the concentrations of dinotefuran in granule and soil were measured at three years after the beginning of the test. These results showed that the effective term of Mikeblock granule was more than three years.

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