Study on the effect of sulfonic acid root position on the stability of SDBS emulsified asphalt

Emulsified asphalt systems require emulsifiers to reduce oil–water interfacial energy generation to improve their stability. In this paper, the effect of the molecular structure of the SDBS emulsifier on the stability of emulsified asphalt was investigated using microscopic simulation (MD) and macroscopic tests. The effect of the molecular structure of asphalt emulsifiers on the stability of emulsified asphalt was quantified by varying the position of sulfonic acid roots in SDBS (2-1ΦC12S, 3-1ΦC12S, 4-1ΦC12S). The macroscopic tests included conventional, laser particle size tests and differential scanning calorimetry tests. The simulation results showed that 4-1ΦC12S reduced the oil–water interface energy the most and was the most hydrophilic, forming a more stable emulsified asphalt system; 2-1ΦC12S and 3-1ΦC12S were less stable due to the spatial site resistance effect of the sulfonic acid root position too close to the alkyl chain end. The test results showed that 4-1ΦC12S emulsified asphalt, with the smallest volume mean particle size, had the best thermal stability. Therefore, the isomer type of SDBS has a greater influence on the stability of emulsified asphalt, and 4-1ΦC12S has a better emulsification effect. The results indicate that future molecular structure synthesis of emulsifiers needs to fully consider the effect of isomers of emulsifiers on the emulsification effect, and the results of this paper can provide a theoretical basis for the future synthesis of high-performance emulsifiers.

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  • English

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  • Accession Number: 01891566
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 28 2023 9:34AM