ポリエチレングリコール(PEG)含浸による出土木材の保存処理の改良

陽イオン界面活性剤を使用して

抄録

In the conventional polyethylene glycol (PEG) method for conservation of waterlogged wood, it becomes sometimes difficult for PEG to penetrate into wood, depending on wood species or the degree of deterioration, and the shrinkage (e.g., max. 20-30% in tangential direction) or warp of specimens occurs. In the present study, in order to maintain their dimension and mechanical strength, Akagashi (quercus acuta Thunb.) wood was treated with some cationic surfactants which are easily adsorbed on cellulose and thus lower surface tention of water. By the surfactant treatment it is expected that possible shrinkage accompanied by water evaporation can be reduced. The size of the specimens used were 3×3×1.5 (tangential×radial×longituainal in cm). They were soaked in a few percent of cationic surfactant solution, followed by immersion into PEG solution with gradual increase of its concentration. The variations of dimension and weight were monitored periodically. As the result it was found that the surfactant treatment allowed PEG to penetrate easily into waterlogged wood which is otherwise difficult to allow the conservation treatment. Furthermore, it was noticed that the shrinkage and change in shape could be minimized, and the dimensions were maintained without any significant change. In addition, by using the present treatment, one can expect that the penetration time in the PEG treatment will be shortened.