An Effective Asphalt UV Blocking Material Based on Host‐Guest Schiff Base/Layered Double Hydroxides

Abstract

The development of asphalt‐based UV blocking materials is important to extend the alphalt lifespan in road construction. In this work, we put forward that the fabrication of host‐guest system can be an effective way to obtain UV blocking materials. Firstly, a new anionic Schiff base, N,N'‐bis(salicylidine)‐4,4'‐diaminostilbene‐2,2'‐disulfonic acid (SDSD), has been synthesized, which was intercalated into Zn‐Al‐LDH by anion‐exchange method. FT‐IR and XRD illustrate the layered organic–inorganic composite, Zn‐Al‐SDSD‐LDH, has been successfully synthesized with high crystallinity. Laser particle size analyzer, SEM and TEM show that particle size distributions of Zn‐Al‐SDSD‐LDH is in the range 100–500 nm. UV–vis absorption spectra show that Zn‐Al‐SDSD‐LDH has better UV absorption than the pristine Zn‐Al‐LDH and SDSD. Furthermore, the mixture of asphalt and 3 wt% Zn‐Al‐SDSD‐LDH presents enhanced UV blocking property relative to the pristine asphalt after irradiating by UV spray accelerated weathering test. Therefore, this work not only develops a new type of host‐guest Zn‐Al‐SDSD‐ LDH, but also confirms it can be an effective asphalt UV blocking material for practical application.