Plywood Adhesive Preparation and Evaluation with Soybean Flour in the Presence of Phthalic Anhydride, Glycerol and Epoxy Resin as Modifiers

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.