A method for preparing recycled SBS-modified asphalt based on a targeted dual dynamic covalent network.

CN122302584APending Publication Date: 2026-06-30HUNAN UNIV
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN UNIV
Filing Date
2026-05-29
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing technologies struggle to effectively reconstruct the polymer network of aged SBS-modified asphalt at the molecular level, leading to a loss of its resistance to rutting at high temperatures and fatigue cracking at low temperatures. Furthermore, traditional regenerators present compatibility issues and environmental burdens.

Method used

By employing targeted dual dynamic covalent network technology, and combining a crosslinking leader containing polyepoxy groups and a dynamic crosslinking agent containing disulfide bonds with an ester exchange catalyst, in-situ chemical reconstruction of aged SBS modified bitumen is achieved, constructing a dual dynamic reversible network of β-hydroxy ester bonds and disulfide bonds.

Benefits of technology

It significantly restores the macroscopic mechanical properties and microscopic network structure of recycled SBS modified asphalt, endows asphalt pavement with excellent room temperature self-healing ability, extends the pavement's life cycle durability, and reduces preparation costs.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122302584A_ABST
    Figure CN122302584A_ABST
Patent Text Reader

Abstract

This invention relates to the field of road engineering materials technology, specifically to a recycled SBS modified asphalt based on a targeted dual dynamic covalent network and its preparation method. The raw materials for this recycled SBS modified asphalt, by weight, comprise: 100 parts of aged SBS modified asphalt, 5-15 parts of a crosslinking leader containing polyepoxy groups, 2.5-7.5 parts of a dynamic crosslinking agent containing disulfide bonds, and 0.146-1.051 parts of an ester exchange catalyst. It is obtained by sequentially adding the crosslinking leader containing polyepoxy groups, the dynamic crosslinking agent containing disulfide bonds, and the ester exchange catalyst to molten aged SBS modified asphalt under stirring conditions. The synergistic effect of these components restores the macroscopic mechanical properties of the aged asphalt, endowing it with high-temperature thermoplastic processing fluidity and intrinsic microcrack self-healing ability at room temperature. This invention features a simplified process, good system compatibility, and achieves dual regeneration through physical softening and viscosity reduction, and in-situ reconstruction of the macromolecular network.
Need to check novelty before this filing date? Find Prior Art