Synthesis and characterization of alkoxy silane modified polyurethane wood adhesive based on epoxidized soybean oil polyester polyol

The alkoxysilane/isocyanate-terminated polyurethane (SPU) was prepared as bio-adhesive. For this purpose, a bio-polyol was synthesized and modified by epoxidized soybean oil (ESBO) and tetra ethyl ortho silicate (TEOS), respectively. In the following this modified bio-polyol was reacted with polymeric 4, 4'-diphenylmethane diisocyanate (pMDI) to form the bio-adhesive. The performance of the bio-adhesive was improved by using zinc oxide nanoparticles (ZnO NPs), triethylene glycol (TEG) and dibutyltin dilaurate (DBTDL) as additives. The effect of mentioned additives on the bio-adhesive strength was investigated and optimized using Taguchi method. The lap shear strength in optimal condition was obtained 6.478 MPa. This tensile strength value was in good agreement with predicted value (7.173 MPa) by Taguchi method.