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Title Transcription
モクザイ セッチャク ニ カンスル ケンキュウ ダイ8ポウ ユリア ジュシ セッチャクザイ ノ ゲルカ ジカン ニ オヨボス モクザイ チュウシュツブツ ノ エイキョウ
Title Alternative
Studies on the Wood Gluing(VIII) : The Effects of Wood Extractives on the Gelation Time of Urea-Formaldehyde Resin Adhesive
File
language
jpn
Author
Onishi, Hirotsugu
Goto, Teruo
Description
It has been suggested that wood extractives have effects on the curing reaction of adhesive. The pH and buffer action of wood may affect the gelation of urea-formalde -hyde resin adhesive(UF) because the rate of curing of this resin is closely dependent on hydrogen ion concentration.
In this paper, the influence of the wood extractives with cold water, boiling water or alcohol-benzene on the gelation time of UF and the compressive strength of setting material are investigated. The gelation time was measured by using the gel timer which indicated the resistance to movement of disc through the gelating liquid. The disc is oscillated up and down in the gel with its plant horizontal.
The results of this experiment are as follows :
1) The gelation time of UF to which wood extractives were added increases with the increased amount of wood extractives with cold and boiling water. On the cold water extractives, a certain relationis observed between the gelation time and the pH of wood, that is, the gelation time decreases in connection with the decreasing of hydrogen-ion concentration of each wood. Although the extractives with alcohol-benzene also has a decreasing effect on gelation time, it needs longer than the gelation time of UF only.
2) The compressive strength and the ratio of plastic region to elastic region of set gel decrease with the increasing gelation time.
Journal Title
Bulletin of the Faculty of Agriculture, Shimane University
Volume
5
Start Page
61
End Page
65
ISSN
0370940X
Published Date
1971-12-15
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
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