Abstract
A novel amphoteric asphalt emulsifier of octadecylbis(propanamide)-(3’-sodium phosphate-2’-hydroxypropyl)ammonium chloride was synthesised from the raw materials octadecylamine, acrylamide, epichlorohydrin and sodium dihydrogen phosphate. The tertiary amine octadecyl-bis(propanamide) was synthesised from octadecylamine and acrylamide (step 1). Sodium 3-chloro-2-hydroxypropyl phosphate (intermediate) was obtained from epichlorohydrin and sodium dihydrogen phosphate (step 2). The asphalt emulsifier was obtained from octadecyl-bis(propanamide)-tertiary amine and the intermediate by quaternisation reaction (step 3). The yield of the final product reached 94.90%. The structure was identified by FTIR, 1H-NMR and elemental analysis. The critical micelle concentration of the product is 1.46 × 10–5 mol L–1. The surface tension at CMC is 37.78 mN ν–1. The saturated adsorption amount of asphalt emulsifier is 2.72 × 10–3 mmol ν–2. The occupied area per asphalt emulsifier molecule at CMC is 0.611 nm2 mol–1. The surfactant is a fast-setting asphalt emulsifier.
Zusammenfassung
Ein neuartiger amphoterer Asphaltemulgator aus Octadecyl-bis(propanamid)-(3’-Natriumphosphat-2’-hydroxypropyl)ammoniumchlorid wurde aus den Rohstoffen Octadecylamin, Acrylamid, Epichlorhydrin und Natriumdihydrogenphosphat synthetisiert. Das tertiäre Amin Octadecyl-bis(propanamid) wurde aus Octadecylamin und Acrylamid synthetisiert (Schritt 1). Natrium-3-chloro-2-hydroxypropylphosphat (Zwischenprodukt) wurde aus Epichlorhydrin und Natriumdihydrogenphosphat gewonnen (Schritt 2). Der Asphaltemulgator wurde aus tertiärem Octadecyl-bis(propanamid) Amin und dem Zwischenprodukt durch Quaternisierungsreaktion erhalten (Schritt 3). Die Ausbeute des Endprodukts erreicht 94,90%. Die Struktur wurde durch FTIR, 1H-NMR und Elementaranalyse identifiziert. Die kritische Mizellenkonzentration des Produkts (CMC) beträgt 1.46 × 10–5 mol L–1. Die Oberflächenspannung bei CMC beträgt 37,78 mN ν–1. Die gesättigte Adsorptionsmenge des Asphaltemulgators beträgt 2,72 × 10–3 mmol ν–2. Die belegte Fläche pro Asphaltemulgatormolekül an der CMC beträgt 0,611 nm2 mol–1. Das Tensid ist ein schnell abbindender Asphaltemulgator.
About the authors
Laishun Shi is a professor at the School of Chemistry and Chemical Engineering, Shandong University, Jinan, China. His research interests are focused on synthesis and application of asphalt emulsifier. Tel.: 13605316520
Tong Ji is a postgraduate student at the School of Chemistry and Chemical Engineering, Shandong University, Jinan, China. His research interests are focused on synthesis and application of asphalt emulsifier.
Jingqiu Ma is a postgraduate student at the School of Chemistry and Chemical Engineering, Shandong University, Jinan, China. His research interests are focused on synthesis and application of asphalt emulsifier.
Xiaomeng Yu is a postgraduate student at the School of Chemistry and Chemical Engineering, Shandong University, Jinan, China. Her research interests are focused on synthesis and application of asphalt emulsifier.
Yawen Chen is a postgraduate student at the School of Chemistry and Chemical Engineering, Shandong University, Jinan, China. Her research interests are focused on synthesis and application of asphalt emulsifier.
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