Chemical Modified Soy Protein Matrix Composite Material Structure And Performance Study

To improve the mechanical and water resistant properties of soybean protein matrix composites, the effect of hydroxypropyl cellulose/epoxy castor oil acid sodium and protocatechuic acid (PA) on the properties of soy protein film were studied. The properties of the films were examined by the Universal mechanical testing machine, Fourier transform infrared spectrometer (FTIR-ATR), X-ray diffraction (XRD), Thermogravimetric analysis (TG) and Scanning electron microscope (SEM). The results show that hydroxypropyl cellulose/epoxy castor oil acid sodium and PA could significantly improve the mechanical properties of soy protein film. Then the modification soy protein adhesive with PA was studied and glues the plywood with the soy-based adhesives. The results were follows:compared with the control film, tensile strength and elongation at break of the film prepared from SP1,2%HPC, 10%ECOS and ASA synchronously increased by 42.3% and 22.7%, respectively; PA improved the mechanical properties and water resistance of soy protein films, the tensile strength with 4% PA was enhanced to 5.80MPa by 56.33%. The water resistance bond strength of soy protein adhesive was not obvious with PA. The chemical reacted between epoxy group of epoxy castor oil acid sodium and the amino of soy protein; the crosslinking reacted between PA and soybean protein.