The Utilization of Waste Cooking Oil as a Polyol Mixture in the Production of Polyurethane for Exterior Grade Plywood

다국어 초록 (Multilingual Abstract)

This work analyzed the feasibility of WCO-based Bio-Polyurethane for plywood adhesives as a friendlier environmental alternative to petroleum-sourced polyols. The objective was to find how different WCO concentrations and MDI consumption levels will be affecting performances in Bio-PU and plywood. First, filtering WCO and then blending it with polyol in the following ratios: P1= 80:20, P2= 40:60, P3= 60:40, P4= 80:60, by mix at 25 °C for 30 minutes. The polyols were mixed with WCO and MDI at 50% and 100% concentration, respectively, stirred at room temperature for 15 minutes. Consequently, the property, rheology, and functional group of Bio-PU were characterized. Laboratory-made plywood from 3 layers of crosswise-oriented 100 mm × 100 mm x 2 mm, Hevea brasiliensis (rubberwood) veneer, was bonded with Bio-PU using the dual spread technique. Hot pressing at 120 °C and 1 MPa, 180 g.m-2, for 4 min. Physical and mechanical properties and bonding quality were determined for the laboratory-made plywood. Results revealed that Bio-PU exhibited peculiar adhesive characteristics with excellent bonding strength, which decreased slightly with the increase in WCO concentrations. Insertion of WCO did not affect the resistance to delamination. FTIR studies confirmed the synthesis of polyurethane chains. The present work illustrated the opportunities of WCO-based Bio-PUs as an eco-friendly plywood adhesive with enhanced performance.