Partial replacement of phenol in phenol-formaldehyde adhesive with tannin and cost performance of imported adhesives in local plywood industry
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Date
1997-02-22
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Abstract
Tannin extracted from Acacia nilotica, a local plant species was used to prepare Tannin-Phenol-formaldehyde resin, a phenolic adhesive in which Phenol has been partially substituted. The bonding strength of the adhesive was compared with Urea-Formaldehyde (UF) and Phenol- Formaldehyde (PF) which are currently being imported for commercial production of plywood locally at very high cost.
The objective of this study is to promote the industrial production of T.P.F. to replace PF resin in the manufacture of exterior grade plywood locally which is expected to be relatively cheaper. The current percentage cost of adhesive in local plywood manufacture and consumption level of adhesive were also assessed.
The TPF resin formed hot pressed bond that was superior to UF and comparable to that of PF. The percentage cost of adhesive in local plywood manufacture was observed to have increased approximately from 51.7% in 1992 to 60.7% in 1994. The current consumption of resin was observed to be approximately 1605 tonnes costing about 6.6 billion Cedis for UF and 14.5 billion Cedis in the case of PF.
Description
A thesis submitted to the Board of Postgraduate Studies, Kwame Nkrumah University of Science and Technology, Kumasi, in partial fulfilment of the requirement for the award of the Degree of Master of Science in Wood Science and Technology, 1997