Synthesis and Properties of a Cationic Gemini Asphalt Emulsifier

Abstract

A cationic Gemini surfactant with a benzene ring (abbreviated as C14‐CGB) was synthesized in 2 steps with aniline, epichlorohydrin, and N,N‐dimethyltetradecylamine as starting materials. This product was characterized using mass spectroscopy and nuclear magnetic resonance (1H NMR). The critical micelle concentration (CMC) and surface tension (γcmc) of C14‐CGB were measured from 298 to 313 K and thermodynamic parameters of micellization were calculated. The results showed that the CMC and γcmc were 1.269 × 10−3 mol L−1 and 38.33 mN m−1 at 298 K, respectively. Moreover, upon increasing the temperature, the CMC increases, γcmc decreases, the maximum surface adsorption capacity (Γmax) decreases, and the minimum molecular area (Amin) increases. The emulsified asphalt test showed that C14‐CGB is a slow‐breaking asphalt emulsifier exhibiting excellent emulsifying ability.

Modified Chitosan as a “Multi‐subtype” Macromolecular Emulsifier for Preparing Asphalt Emulsion

“…[30] However, the droplet size of the emulsion stabilized by MCTS ranged from 0.90 μm to 2.30 μm, the mean size is about 1.79 μm, and the PDI of the sample is 0.206, which indicated that the asphalt emulsion is more uniform compared with the asphalt emulsion prepared by other emulsifiers. [1,31] It also can be seen from Figure 5(a); the prepared emulsion presented uniform and fine brown texture, which was usually a sign that asphalt was well emulsified. Therefore, the emulsifier exhibited excellent emulsifying ability in the manufacture of asphalt emulsion based on the above data.…”

“…The storage stability of asphalt emulsion under ambient temperature after 1 day and 5 days were 0.24% and 2.76%, respectively, which was more stable compared to that of the emulsion by using Gemini surfactant . The stability of the emulsion is relative to the droplet size and its distribution.…”

“…In brife, the droplet size of the asphalt emulsion was 5∼10 μm, which has been reported by previous researches . However, the droplet size of the emulsion stabilized by MCTS ranged from 0.90 μm to 2.30 μm, the mean size is about 1.79 μm, and the PDI of the sample is 0.206, which indicated that the asphalt emulsion is more uniform compared with the asphalt emulsion prepared by other emulsifiers . It also can be seen from Figure (a); the prepared emulsion presented uniform and fine brown texture, which was usually a sign that asphalt was well emulsified.…”

“…The storage stability of asphalt emulsion under ambient temperature after 1 day and 5 days were 0.24% and 2.76%, respectively, which was more stable compared to that of the emulsion by using Gemini surfactant. [1] The stability of the emulsion is relative to the droplet size and its distribution. The droplet size distribution of asphalt emulsion placed for a week under room temperature was measured by static light scattering, and the result was shown in Figure 6.…”

“…With the construction of the modern urban transportation system and the improvement of the highway network structure, both the maintenance and repair of the road surface exhibit an increasingly significant role. [1][2] Emulsified asphalt has been an essential material in road maintenance and repair aspects due to its unique indoor temperature construction, energy conservation, and low VOCs. [3][4][5][6] Asphalt emulsions can be divided into three types, including cationic, anionic, and non-emulsion from the surface charge of emulsion droplets.…”