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

• 材料与性能 • 上一篇    下一篇

硅⁃铝包覆TiO2功能化SBS改性沥青抗老化机理及性能研究

杨喜英1(), 张文才1,2, 曲立杰1, 史文秀3   

  1. 1.山西工程科技职业大学交通工程学院,山西 晋中 030619
    2.太原理工大学化学工程与技术学院,太原 030024
    3.山西省交通建设工程质量检测中心(有限公司),太原 030006
  • 收稿日期:2024-01-22 出版日期:2024-10-26 发布日期:2024-10-21
  • 作者简介:杨喜英(1979—),女,正高级工程师,从事道路材料研发及仪器分析技术研究,543458922@qq.com
  • 基金资助:
    山西交通控股集团有限公司科技项目(2022?JKKJ?33);山西工程科技职业大学科技项目(KJ202307)

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

摘要:

为更好地利用纳米二氧化钛(TiO2)优良的紫外线屏蔽功能,提高苯乙烯⁃丁二烯⁃苯乙烯嵌段共聚物(SBS)改性沥青的抗老化性能,解决TiO2因纳米效应难以在SBS改性沥青体系中分散,同时纳米TiO2具有的光催化活性对SBS改性沥青材料进行氧化,导致SBS改性沥青抗老化性能减弱等问题,本文在纳米TiO2表面采用硅⁃铝共沉淀法形成包覆膜,通过透射电子显微镜(TEM)、X射线衍射(XRD)技术分析了包覆效果及包覆体物相结构,应用紫外分光光度法检测了功能化改性沥青的紫外线吸收能力,通过扫描电子显微镜(SEM)、荧光显微镜技术分析了硅⁃铝包覆手段对TiO2及SBS分散性及稳定性的影响,采用红外光谱技术揭示了硅⁃铝包覆TiO2功能化SBS改性沥青的抗老化机理,最后对功能化改性沥青性能进行了分析研究。结果表明,硅⁃铝包覆TiO2含量为6.0 %时,可有效提高TiO2与SBS在沥青中的分散性与稳定性,阻断TiO2光催化活性对改性沥青的氧化作用,提高了SBS改性沥青的抗老化性。

关键词: 苯乙烯?丁二烯?苯乙烯嵌段共聚物改性剂, 纳米二氧化钛, 改性沥青, 老化性能

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

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