Abstract

This study synthesized an imidazoline biosurfactant (IM-BioSurf) from biomass residue and tetraethylenepentamine in two steps. Its structure was characterized by Fourier transform infrared spectroscopy (FT-IR) and proton NMR spectra (¹H-NMR). The critical micelle concentration (CMC) and surface tension (γ_CMC) of IM-BioSurf were measured, as well as the interfacial tension between the IM-BioSurf aqueous solution and asphalt. At 298 K, the CMC and γ_CMC of IM-BioSurf were 4.95 g/L and 38.27 mN·m⁻¹, respectively. IM-BioSurf significantly reduced the oil-water interfacial tension, thus conferring excellent surface and interfacial activity. Emulsified asphalt prepared with the IM-BioSurf emulsifier had excellent storage stability and a uniform particle size distribution with an average size of 1.55 μm. In addition, the influence of IM-BioSurf on evaporation residue performance indicators was very small. Moreover, micro-surface tests showed that the emulsified asphalt acts as an excellent binder in asphalt mixtures. Most importantly, the biomass residue used to prepare IM-BioSurf can be readily obtained at low cost. As such, it is environmentally friendly, sustainable, and can greatly reduce the cost of emulsifier production. IM-BioSurf has broad application prospects as an asphalt emulsifier.

摘要

本研究分两步从生物质残渣和四乙烯五胺中合成了咪唑啉生物表面活性剂 (IM-BioSurf)。其结构通过傅里叶变换红外光谱(FT-IR)和质子核磁共振谱( ¹ H-NMR)表征。测量了 IM-BioSurf 的临界胶束浓度 (CMC) 和表面张力 (γ _CMC )，以及 IM-BioSurf 水溶液和沥青之间的界面张力。在 298 K 时，IM-BioSurf 的 CMC 和 γ _CMC分别为 4.95 g/L 和 38.27 mN·m ⁻¹， 分别。IM-BioSurf 显着降低了油水界面张力，从而赋予了优异的表面和界面活性。用IM-BioSurf乳化剂制备的乳化沥青具有优异的储存稳定性和均匀的粒径分布，平均粒径为1.55 μm。此外，IM-BioSurf对蒸发残渣性能指标的影响很小。此外，微观表面测试表明，乳化沥青在沥青混合料中是一种出色的粘合剂。最重要的是，用于制备 IM-BioSurf 的生物质残渣可以很容易地以低成本获得。因此，它是环保的、可持续的，并且可以大大降低乳化剂的生产成本。IM-BioSurf作为沥青乳化剂具有广阔的应用前景。