一种阳离子Gemini型沥青乳化剂的合成及性能

Synthesis and Properties of a Cationic Gemini Asphalt Emulsifier

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 m N/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。

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（γcmc）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 andγ_（cmc）are1.269×10-3mol/L and 38.33 m N/m at 25℃,respectively.With the rise of temperature,the cmc increases,theγ_（cmc）decreases,the maximum surface adsorption capacity（Γ_（max））decreases and the minimum molecule area（Amin）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.