China Plastics ›› 2024, Vol. 38 ›› Issue (10): 29-35.DOI: 10.19491/j.issn.1001-9278.2024.10.006

• Materials and Properties • Previous Articles     Next Articles

Study on anti⁃aging mechanism and performance of asphalt modified with Si⁃Al coated TiO2⁃functionalized SBS

YANG Xiying1(), ZHANG Wencai1,2, QU Lijie1, SHI Wenxiu3   

  1. 1.College of Transportation Engineering,Shanxi Vocational University of Engineering Science and Technology,Jinzhong 030619,China
    2.College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024,China
    3.Shanxi Transportation Construction Engineering Quality Detection Center(Co,Ltd),Taiyuan 030006,China
  • Received:2024-01-22 Online:2024-10-26 Published:2024-10-21

Abstract:

In order to better utilize the excellent UV shielding function of nano⁃TiO2, improve the anti⁃aging performance of SBS⁃modified asphalt, and address a difficulty in the dispersion of nano⁃TiO2 in the SBS⁃modified asphalt system, the Si⁃Al coated nano⁃TiO2 was prepared using a Si⁃Al coprecipitation method to form the coating film on the surface of nano⁃TiO2. This approach can effectively prevent the oxidation of SBS⁃modified asphalt caused by nano⁃TiO2 due to its photocatalytic activity and thus enhance the anti⁃aging performance of nano⁃TiO2⁃functionalized SBS⁃modified asphalt. The coating effect and morphological microstructure of the coated nano⁃TiO2 were investigated by TEM and XRD, the ultraviolet (UV) absorption capacity of the modified asphalt was analyzed by UV spectrophotometry, the influence of Si⁃Al coating on the dispersion and stability of nano⁃TiO2 and SBS was evaluated by SEM and fluorescence microscopy, and the anti⁃aging mechanism of the Si⁃Al coated nano⁃TiO2 functionalized SBS⁃modified asphalt was analyzed by FTIR spectroscopy. Finally, the performance of the functionalized SBS⁃modified asphalt was studied. The results indicated that the dispersion and stability of nano⁃TiO2 and SBS in asphalt were effectively improved when 6 wt% Si⁃Al coated nano⁃TiO2 was incorporated. In this case, the oxidation effect of nano⁃TiO2 on the modified asphalt could be suppressed, and the anti⁃aging performance of the SBS⁃modified asphalt could be improved.

Key words: styrenic block copolymer, nano titanium dioxide, modified asphalt, aging performance

CLC Number: