Preparation and Characterization of Lignosulfonate Intercalated Layered Double Hydroxides and Their Application in Improving Ultraviolet Aging Resistance for Bitumen

Abstract

In order to develop economically anti-ultraviolet (UV) aging additives to bitumen and extend the comprehensive utilization of lignin materials, lignosulfonate (LS) was selected to intercalate into layered double hydroxides (LDHs), then the LS intercalated LDHs (LS-LDHs) were applied to improve UV aging resistance of bitumen. With the characterization of X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, chemical analysis and scanning electron microscopy (SEM), LS was successfully intercalated into the galleries of LDHs. The ultraviolet and visible (UV-vis) absorbance curves showed LS-LDHs had excellent UV absorptive ability from 200 to 400 nm. Thermogravimetry and differential scanning calorimetry (TG-DSC) indicated LS-LDHs could have a good thermal stability during the processing of bitumen. Compared with the LDHs, the LS-LDHs exhibited better performance in UV aging resistance of bitumen.