Soybean flour (SPF) is the by-product for the production of soy oil. Since it is non-toxic and sustainable, it has been chosen to be as a raw material for the preparation of soy protein-based adhesive to address the issues of formaldehyde release and limited petroleum supplies from traditional wood adhesive. To improve the water resistance and bonding strength of soy protein-based adhesive, glucose was used as a modifier of soy protein-citric acid adhesive to get a fully bio-based soybean flour-glucose-citric acid (SPF/G/C) adhesive in this work. The effects of mass ratio of SPF/G/C and hot-pressing temperature on adhesive properties and water resistance were investigated. The chemical structure and adhesion mechanism of SPF/G/C were analyzed and characterized by nuclear magnetic resonance (13C NMR), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The results showed that glucose effectively connected CA and SPF to form a dense cross-linked network through esterification reaction and Schiff base reaction. The wet shear strength of boiling water reached 1.674 +/- 0.08 MPa under the condition of hot-pressing temperature of 180 degrees C and hot-pressing time of 5 min. The fully bio-based SPF/G/C adhesive with good boiling-water resistance shows great promising prospect in industry.
Fully biomass-based soybean flour-glucose-citric acid wood adhesive with high strength and water resistance
Tondi G.;
2025
Abstract
Soybean flour (SPF) is the by-product for the production of soy oil. Since it is non-toxic and sustainable, it has been chosen to be as a raw material for the preparation of soy protein-based adhesive to address the issues of formaldehyde release and limited petroleum supplies from traditional wood adhesive. To improve the water resistance and bonding strength of soy protein-based adhesive, glucose was used as a modifier of soy protein-citric acid adhesive to get a fully bio-based soybean flour-glucose-citric acid (SPF/G/C) adhesive in this work. The effects of mass ratio of SPF/G/C and hot-pressing temperature on adhesive properties and water resistance were investigated. The chemical structure and adhesion mechanism of SPF/G/C were analyzed and characterized by nuclear magnetic resonance (13C NMR), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The results showed that glucose effectively connected CA and SPF to form a dense cross-linked network through esterification reaction and Schiff base reaction. The wet shear strength of boiling water reached 1.674 +/- 0.08 MPa under the condition of hot-pressing temperature of 180 degrees C and hot-pressing time of 5 min. The fully bio-based SPF/G/C adhesive with good boiling-water resistance shows great promising prospect in industry.
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