Accessible Unlicensed Requires Authentication Published by De Gruyter November 30, 2021

Synthesis and Characterization of an Amphoteric Asphalt Emulsifier

Synthese und Charakterisierung eines amphoteren Asphaltemulgators
Laishun Shi, Tong Ji, Jingqiu Ma, Xiaomeng Yu and Yawen Chen

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.


Prof. Dr. Laishun Shi School of Chemistry and Chemical Engineering Shandong University Jinan 250100 P. R. China Tel.: +86 531 88392980 Fax: +86 531 88392980

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Received: 2021-02-06
Accepted: 2021-04-14
Published Online: 2021-11-30

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