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Title Transcription
モクシツ ザイリョウ ノ カイリョウ ニ カンスル ケンキュウ ダイ21ポウ タンニンサン オヨビ アルギンサンエン ニヨル モクザイ ノ スンポウ アンテイカ
Title Alternative
Studies on the Improvement of Wooden Materials(XXI) : Dimensional Stabilization of Wood with Tannic Acid and Alginate
File
language
jpn
Author
Onishi, Hirotsugu
Jodai, Susumu
Goto, Teruo
Description
In order to prepared the dimensional stabilized wood having hygroscopicity similar to wood itself, the sapwood of Hinoki (Chamaecyparis obtusa Sieb. et Zucc.) was treated with hygroscopic tannic acid and sodium alginate aqueous solutions of varying concentrations. Further, vapor-phase acetylation of the tannic acid and sodium alginate impregnated wood was carried out with acetic anhydride-pyridine system at 70℃ for 20 hours. The hygroscopicity and dimensional stability were evaluated by the moisture absorption and amounts of swelling in tangential direction of treated wood to control at 20℃ and 93 percent relative humidity.
The results obtained are as follows :
(1) The hygroscopicities of woods treated with tannic acid and sodium alginate are the same as or more than that of control, and depend on the amount of impregnant in wood. Swelling is reduced by 20 percent.
(2) The acetylation of tannic acid and sodium alginate impregnated wood results in remarkable bulking effect. The anti-swelling efficiency and moisture-excluding efficiency are 30 to 60 percent and 20 to 60 percent, respectively. In particular, the reduction of hygroscopicity accompanying the acetylation of sodium alginate impregnated wood is 40 percent, while the anti-swelling efficiency is 60 percent. This suggests that the preparation of an improved wood having both properties of hygroscopicity and dimensional stability is possible.
(3) Increased dimensional stability is attributed to the bulking effect than to a reduced hygroscopicity of wood substrates.
Journal Title
Bulletin of the Faculty of Agriculture, Shimane University
Volume
13
Start Page
74
End Page
80
ISSN
0370940X
Published Date
1979-12-15
NCID
AN00108015
Publisher
島根大学農学部
Publisher Aalternative
Shimane University, Faculty of Agriculture
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Shimane University
Remark
開学30周年記念号
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