Potential of Tannins for Exterior Grade Plywood

Resins from Uncaria gambier and Acacia catechu tannins were prepared by copolymerization with phenol and formaldehyde at 100°C. Both tannins were used to substitute up to 50 percent of the phenol using 5, 8, and 11 percent alkali concentrations. Adhesive formulations and gluing conditions were teste...

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Bibliographic Details
Published in:Forest products journal 2012-08, Vol.62 (7-8), p.559-565
Main Authors: Mathur, Smita, Sharma, Pradeep, Shukla, K.S, Soni, P.L
Format: Article
Language:English
Subjects:
Adhesive bonding
Adhesives
Analysis
Caustic soda
Chemical properties
Flavonoids
Forest products industry
Phenols
Plywood
Polymerization
Resins
Shear strength
Sodium
Studies
Tannins
Viscosity
Wood
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Summary:Resins from Uncaria gambier and Acacia catechu tannins were prepared by copolymerization with phenol and formaldehyde at 100°C. Both tannins were used to substitute up to 50 percent of the phenol using 5, 8, and 11 percent alkali concentrations. Adhesive formulations and gluing conditions were tested by preparing three-ply Shorea robusta boards (53.34 by 53.34 cm). We found that U. gambier tannin can substitute up to 50 percent of the phenol, using 8 and 11 percent sodium hydroxide as a catalyst; A. catechu tannin can substitute up to 30 percent of the phenol, using 8 and 11 percent sodium hydroxide. The resultant boiling water resistance grade plywood meets the requirements laid down in Indian Standards (IS) 303-1989 for exterior grade plywood in all respects (i.e., glue shear strength in dry, water resistance, and mycological tests).
ISSN:0015-7473
2376-9637
DOI:10.13073/FPJ-D-12-00060.1