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A new cationic type asphalt emulsifier of aminoethylpiperazine/formaldehyde modified lignin amine was synthesized by the reaction of lignin, N-aminoethylpiperazine, sodium hydroxide and formaldehyde. The synthesis process was detected by online FTIR technique and the intermediate was found. Based upon the experimental information, a reaction mechanism was suggested for the reaction. The asphalt emulsifier has excellent surface activity and satisfactory emulsification effect. The prepared asphalt emulsion showed higher storage stability. The emulsifier belongs to medium-set emulsifier of asphalt. It can be applied to the road pavement construction of tack coat and chip seal. Introduction Asphalt emulsion is a homogeneous system containing asphalt, water and emulsifiers. It can be applied to the road construction. Asphalt emulsion has the advantage of stronger adhesive power with mineral aggregate, lower energy consumption, and less pollution to the environment by comparing with hot asphalt [1-3]. Asphalt emulsifier can be divided into anionic, cationic, zwitterionic and non ionic types. Wates and James reported a polybetaines asphalt emulsifier, which provide superior cationic and anionic emulsions, and slow-setting emulsions at low use levels, and the excellent adhesion of the cured asphalt film [4]. W.T. Zdybak reported an oil-in-water anionic bituminous emulsion, wherein an anionic emulsifier was prepared by reacting lignosulfonate with a sulfonyl chloride or bromide of benzene or substituted benzene or an aliphatic hydrocarbon with four or more carbon atoms [5]. P. Schilling reported a high viscosity cationic slow-set and medium-set emulsions [6]. The emulsifying compositions are combinations of fatty amine and/or polyamine, lignin, and nonionic surfactant. A preferred emulsifying composition can be produced by reacting the combinations of fatty amine and/or polyamine, lignin, and nonionic surfactant with formaldehyde. A lignin amine type asphalt emulsifier, which was using the raw materials of soda lignin, secondary amines and inexpensive aminating assistants, was synthesized by B. Wu et al [7]. Dissymmetric Gemini quaternary ammonium salts cationic asphalt emulsifiers with three carbon chains were synthesized using the raw material of N,N-dodecyl dimethyl tertiary amine, N,N-octadecyl dimethyl tertiary amine, epichlorohydrin and hydrochloric acid [8]. Liu et al studied the preparation and storage stability of asphalt emulsions made from modified lignin cationic asphalt emulsifiers [9]. In previous papers we have synthesized different types of asphalt emulsifiers [10-13]. With the rapid development of road pavement construction and maintenance, it is necessary to develop and present other new kind of medium-set cationic asphalt emulsifier. Therefore, in this paper a new medium-set cationic asphalt emulsifier was synthesized by the reaction of lignin, N-aminoethylpiperazine, sodium hydroxide and formaldehyde. It can be applied to the road pavement construction of tack coat and chip seal. 0133 4th Annual International Conference on Material Science and Engineering (ICMSE 2016) © 2016. The authors – Published by Atlantis Press Experimental Materials. N-aminoethylpiperazine was of industrial grade. Formaldehyde was of analytical grade and obtained from Laiyang Economic Development Zone Fine Chemical Plant, Laiyang, China. Alkali lignin was of industrial grade, and obtained from Shaoxing Guotai Additives Plant, Shaoxing, China. The asphalt used was AH-90, which was provided by Qilu Petrochemical Company, Zibo, China. The mineral aggregate was the mixture of marble stone in different size. Synthesis. Scheme 1 shows the synthesis route of aminoethylpiperazine/formaldehyde modified lignin amine.

Synthesis of Aminoethylpiperazine/Formaldehyde Modified Lignin Amine Asphalt Emulsifier and Its Investigation by Online FTIR Spectrophotometry