| Abstract:This paper based on the mechanism that phenolic hydroxyl groups of catechin and side-chain carboxyl groups of silk fibroin fibers are capable of coordinating with metal ions, a ternary Ti–Ag–Zn composite metal ion system with concentrations of 0.1 mol/L Ag?, 0.3 mol/L Zn²? and 0.5 mol/L Ti?? was adopted as the coordination bridge. By modulating the pH of the reaction system, the metal ions simultaneously formed coordinate bonds to crosslink catechin and silk fibroin fibers, thereby constructing a three-dimensional composite network of catechin-metal ion-silk fibroin fiber. The mass ratio of catechin, silk fibroin fiber and composite metal ion solution was controlled at 1:1:200 in the experiment. The modified silk fibroin fibers were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and tensile strength testing. The test results reveal that metallic crystalline deposits form on the surface of modified silk fibroin fibers, and the thermal stability of the material is significantly improved. Subsequently, the modified silk fibroin fibers were blended with bamboo pulp fibers at a mass ratio of 3:7 for papermaking to fabricate functional paper-based composite materials. Mechanical strength tests, UVB313 ultraviolet weathering aging experiments and antibacterial performance tests were carried out in comparison with ordinary paper. The results verify that the mechanical strength of the composite paper is markedly enhanced, and it exhibits excellent inhibitory effects against Staphylococcus aureus, Escherichia coli and Candida albicans. |