Practical Application of CCS (Chitosan-Copper Salts) Preservatives as a Post-CCA

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The purposes of this study are to establish the standard impregnation manual of CCS preservative as post-CCA, to develop the quick measurement system of K value, to improve the penetration ability of CCS into the full-sized timbers, to evaluate the long-period antibiodeterioration effects of the treated woods, to estimate the chemical stability of the preservative, and to carry out the preliminary evaluation of poisons of the preservative. The outline of the obtained results is as follows.1)CCS preservative was able to use with the same as the handling manners of the commercially distributed water-soluble metal-preservatives.2)K values were easily measured applying by the conventional image analyzing techniques3)Penetrating ability of CCS into the full-sized timbers was improved by modifying molecular weight of CCS or combining PEG to CCS molecules, however, there was no change in fixation ability of the modified CCS.4)Wood-pegs impregnated with CCS showed amazing effects against termites and fungi5)during whole period exposed for six years.6)CCS preservatives showed good stability for five-time recycling use in treatments.7)CCS preservatives showed no signs of poison against rats.