18 木材防腐剤に関する研究第4報 : 松根原油の防腐効果について

概要

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This experiment has the objects to study on the preserving power of pine root oil. This is a principal constituent of preservative which is prepared in the WOOD RESEARCH INSTITUTE, KYOTO UNIVERSITY. And then at same time we tested the preserving power of coal-tar, hinori oil. and two sorts of pine root heavy oil mixed sulfurous turpentin oil. 1. On the "Kuromatsu"(Pinus Thunbergii) which is painted with pine root oil, the rate of decrease in compressive strength is 1.2%, and"the staying ratio"is 1.17 times of unpainted wood. On the wood which is painted with coal-tar, the rate of decrease is 4.6%, and"the staying ratio"is 1.12. 2. On the"Kuri"(Castanea crenata) which is painted with pine root oil, the rate of decrease is 2.2%, and "the staying ratio"is 1.28 On the wood which is painted with coal-tar, the rate of decrease is 9.8%, and "the staying ratio"is 1.19. 3. As well, on the "Hinoki"(Chamaecyparis obtusa) which is painted with pine root oil, the rate of decrease is 0.0%, and "the staying ratio"is 1.20. On the wood which is painted with coal-tar, the rate of decrease is 2.8%, and "the staying ratio"is 1.15. 4. The reason that the pine root oil has the greatest preserving power on these three sorts of wood is the following. Cresol fraction which has great strilizing power is existent in 175〜240℃ distillate of pine root oil, i.e., middle oil. It seems that the middle oil is useful in the preserving action of pine root oil.
1951-02-25