Abstract:
The properties of soybean flour modified with various combinations of modifiers were
as modifiers in different amounts (1-10% w/w). The effect of modifiers on the enhanced
reactivity of co-polymerized soybean adhesives was monitored by FTIR spectroscopy.
Three-ply plywood samples were bonded with modified resins from 3 mm thick veneers
and 3-point bending strength) in order to check whether the bond quality met the interior
plywood quality standards. The optimum press temperature, time and pressure for
plywood pressing were found to be 120 °t), 5 min and 0.45 MPa respectively. 34 % (w/w)
soybean flour modified with 7% (w/w) glycerol and 1% (w/w) phthalic anhydride bonded
test the opposite effect was evident as expected. The plywood specimens with 15% (w/w)
MPa. The overall results have indicated that the increasing weight % of modifier species
have greatly influenced on many properties of the resultant soybean flour adhesives but
mechanical properties of plywood. Thus, phthalic anhydride, glycerol, urea-formaldehyde
and epoxy resins have influenced to unfold protein and carbohydrate fractions in the
compact structure of soybean. Thus, soybean flour in combination with modifiers can be
used to prepare plywood with excellent mechanical properties, comparable to commercially
available synthetic plywood adhesives. The work indicated that an environmentally
friendly adhesive can be prepared from a natural renewable resource to be utilized in the
interior grade plywood.
