Abstract
Using sodium bisulfite and epichlorohydrin as raw materials, the ring-opening reaction is carried out under the action of acatalyst to produce sodium 3-chloro-2-hydroxypropane sulfonate, followed by dodecyl tertiary amine, isopropanol, sodium hydroxide and 3-chloro-2-hydroxypropane sulfonate sodium as raw materials, under certain conditions to synthesize dodecyl hydroxy sulfobetaine surfactant. The surface tension, interfacial tension, salt resistance and emulsification properties of the synthesized surfactants were tested and evaluated. The experimental results show that the surfactant has a low critical micelle concentration and surface tension; the interfacial tension decreases with the increase of surfactant concentration. When the concentration is greater than or equal to 0.3%, the interfacial tension reaches 10-2 level; the dodecyl hydroxy sulfobetaine surfactant solution shows good salt resistance; when the concentration of dodecyl hydroxy sulfobetaine surfactant solution is 0.5%, the water separation rate in 120 minutes is the lowest and the emulsification ability is the strongest.
Highlights
The betaine has a wide range of uses in daily chemical production
0.05%, 0.1%, 0.2%, 0.3%, 0.4% and 0.5% dodecyl hydroxy sulfobetaine surfactant solutions were prepared with distilled water, and the surface tension of kerosene was measured with XZD-5 rotating droplet interfacial tension meter at a fixed temperature of 30 °C
It can be concluded from the table that the critical micelle concentration of dodecyl hydroxy sulfobetaine surfactant is about 0.1%, and the surface tension corresponding to critical micelle concentration point is 29.8mN/m
Summary
The betaine has a wide range of uses in daily chemical production. Betaine-type surfactants are stable to hard water, have excellent foaming power and wetting power, and have good compatibility with other types of surfactants [1]. Its structure has anionic groups, and cationic groups It has more good properties than other surfactants, such as excellent hard water resistance, electrolyte resistance, low toxicity, good compatibility, mild performance, and easy degradation by organisms. The hydroxy sulfobetaine contains all the characteristics and advantages of amphoteric surfactants, and has numerous advantages such as better emulsification, antistatic and dispersibility. It has been widely used in daily chemical industry, oil displacement, fracturing, acidification and other fields [23]. Dodecyl tertiary amine, isopropanol, sodium hydroxide and sodium 3chloro-2-hydroxypropane sulfonate were used as raw materials to synthesize dodecyl hydroxy sulfobetaine surfactant, and the properties of the surfactant solution were studied [5]
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