一种阳离子Gemini型沥青乳化剂的合成及性能

以苯胺、环氧氯丙烷和十四烷基二甲基叔胺为原料,合成了含有苯环的阳离子Gemini型沥青乳化剂3,3'-苯基亚氨基-(二(2-羟基丙基-十四烷基二甲基)氯化铵)(G-T)。 采用傅里叶红外光谱(FT-IR)、质谱(MS)和核磁共振谱(¹H NMR)对产物进行了结构表征。 研究了其Krafft点、乳化性能和乳化沥青时的相关性能,并测定了25~40 ℃的临界胶束浓度(cmc)、平衡表面张力(γ_cmc)及计算了相应的热力学函数。 结果表明,G-T的Krafft点低于0 ℃,乳化分水时间为309 s。 25 ℃时,cmc为1.269×10^-3 mol/L,γ_cmc为38.33 mN/m。 随着温度的升高,cmc增大、γ_cmc减小、饱和吸附量(Γ_max)减小、极限占有面积(A_min)增大。 乳化沥青测试表明,G-T拌和时间为255 s,是慢裂型沥青乳化剂。 所制备的乳化沥青满足微表处技术规范。

Synthesis and Properties of a Cationic Gemini Asphalt Emulsifier

A cationic Gemini asphalt emulsifier with benzene ring(symbolized as G-T) was synthesized with aniline, epichlorohydrin and N,N-dimethyltetradecylamine by two steps. The product was characterized by Fourier transform infrared spectroscopy(FT-IR), mass spectroscopy, and proton nuclear magnetic resonance(¹H NMR) spectroscopy. The Krafft point, emulsifying power and performance of emulsified asphalt were studied. The critical micelle concentration(cmc) and surface tension(γ_cmc) of G-T were measured from 25 ℃ to 40 ℃ and thermodynamic parameters of the micellization were calculated. The results show that the Krafft point of G-T is below 0 ℃, and the stable time of the emulsified liquid is up to 309 s. The cmc and γ_cmc are 1.269×10^-3 mol/L and 38.33 mN/m at 25 ℃, respectively. With the rise of temperature, the cmc increases, the γ_cmc decreases, the maximum surface adsorption capacity(Γ_max) decreases and the minimum molecule area(A_min) increases. Emulsified asphalt test shows that G-T is a slow-crack asphalt emulsifier. The prepared emulsified asphalt meets the technical specifications of micro-surfacing.