Work

The reaction mechanism and performance evaluation of one-pot preparation of full biomass adhesive with defatted soybean and phytic acid

Year: 2026

Type: article

Abstract: With agricultural renewable resources used to develop adhesives for artificial boards, maintaining good bonding performance and easy coating while considering antibacterial and flame-retardant properties presents a major challenge. In this study, a whole biomass-based wood adhesive (SPA) based on defatted soybean flour (SF) and phytic acid (PA) was developed and prepared via one-pot blending heating process. The microscopic chemical changes between SF and PA were revealed through Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and other analyses. PA crosslinked SF via ionic/hydrogen bonds, forming a robust network through esterification / amidation during hot-pressing, which enhanced bonding, water resistance, and multifunctionality. This structure effectively improved the bonding performance of SPA. The shear strengths of the prepared plywood under dry state, 3 h hot-water (63 °C) and 3 h boiling-water immersion conditions were 1.34, 1.22, and 1.01 MPa, respectively, which are considerably higher than the national standard requirements (GB/T 17657–2022; ≥0.70 MPa). In addition, the SPA exhibited good wettability, antibacterial, and flame-retardant properties, environmental friendliness, and sustainability advantages. These advantages demonstrate that SPA provides a simple, practical, and efficient method for developing sustainable, high-performance biomass-based adhesives, laying a preliminary research foundation for future exploration in wood processing applications. • In this study, a high-performance biomass-based wood adhesive (SPA) was prepared; it combines environmentally friendly and efficient bonding performance using sustainable raw materials defatted soybean flour and phytic acid (PA). • Through the multiple bonding between soybean protein and PA, a dense cross-linked network structure was constructed, which substantially improved the bonding performance of the adhesive. • SPA showed good wettability, antibacterial, and flame-retardant properties.

Source: Industrial Crops and Products

DOI: 10.1016/j.indcrop.2026.122639