Develop a novel and multifunctional soy protein adhesive constructed by rosin acid emulsion and TiO organic-inorganic hybrid structure.

Soy protein adhesives (SPI) exhibit broad prospects in substituting aldehyde-based resin due to the economic and environmental-friendly characteristics, but still face a challenge because of the dissatisfied bonding strength and terrible water resistance. Herein, prompted by organic-inorganic hierarchy, a multifunctional and novel soy protein adhesive (SPI-RAE-TiO) consisting of rosin acid emulsion (RAE) and TiO nanoparticles (TiO) were proposed. In comparison with original SPI, the dry and wet shear strengths of modified adhesive reached 2.