イソシアネート化合物による木材の寸法安定化(<小特集>木質材料小特集)

概要

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In order to produce composite materials having dimensional stability and hygroscopicity similar to wood itself, three kinds of alcohols (propanol, propanediol and glycerin) were reacted with 4,4'-diphenylmethane diisocyanate (MDI) in heartwood of Hinoki (Chamaecyparis obtuse Sieb. et Zucc. ). The hygroscopicity and dimensional stability were evaluated by the amounts of urethane compounds combined with wood components, urethane compounds deposited into wood cavities and free alcohols. Their amounts were determined by means of the solvent extraction method. In the reaction of alcohols and MDI in wood, the amount of products introduced into wood in creased with increasing the number of hydroxyl groups and mole fraction of alcohol in the reaction system. The moisture-excluding efficiency (MEE) and the anti-swelling efficiency (ASE) decreased with increasing the amount of products. The combined urethanes components which exist in cell walls contribute directly to the increase of MEE and ASE. There is no significant effect of depositing urethane components on ASE. Also, the free alcohols considerable affect the increase in hygroscopicity of the treated wood.
社団法人日本材料学会の論文
1988-05-15