Impact of polyvinyl alcohol for bio-adhesives preparation from tannery solid waste and its application in leather products industry

In this study an attempt has been undertaken to utilize the solid wastes generated by the leather industry, particularly raw trimmings, for making bio-adhesive in a cost effective and sustainable way. To enhance the adhesion properties of prepared bio-adhesive, polyvinyl alcohol (PVA) with different ratios were incorporated. Here raw trimmings was hydrolyzed using calcium oxide (CaO) and yielded maximum gelatin of 38.67% at 75°C and 4.5 hrs. The properties of the prepared adhesives were assessed through the various parameters such as viscosity, ash content, pH, density, moisture content, shear strength and peel strength. Considering shear and peel strength test, bio-adhesive containing Gelatin-PVA ratio of 1:4 have shown characteristics features that can be used as temporary adhesive in different stages of leather products preparations. This ratio almost fulfill the standard requirement. Bangladesh J. Sci. Ind. Res. 59(1), 07-16, 2024