Large-head-group quaternary ammonium salt surfactant and preparation method thereof
A technology of surfactants and quaternary ammonium salts, which is used in the synthesis and application of surfactants, and can solve problems such as poor solubility
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Embodiment 1
[0018] Embodiment 1: the synthesis of dodecyl diethylamine: take dodecyl bromide (99.9g, 0.4mol), diethylamine (117.0g, 1.6mol) and 200mL absolute ethanol are placed in a single-necked bottle, heated Reflux for 48 hours. After the reaction, cool to room temperature, add NaOH (80.0 g, 2.0 mol) and stir well for 1 hour. Excess ethanol is removed by rotary evaporation, and pure dodecyldiethylamine is obtained by distillation under reduced pressure.
Embodiment 2
[0019] Example 2: C 12 NC 4 Synthesis of dodecyldiethylamine (20.0g, 0.08mol), n-butane bromide (17.0g, 0.12mol) and 50mL absolute ethanol were added to a sealed single-necked bottle, reacted at 80°C for 48h, and the reaction was completed , the ethanol was removed by rotary evaporation, and ethyl acetate crystallized to obtain a white product.
Embodiment 3
[0020] Embodiment 3: the mensuration of surface tension: prepare the surfactant C of a series of different concentrations 12 NC 4 At 25°C, the surface tension of the aqueous solution was measured by the ring method. Each point was repeated 3 times, and the average value was taken to draw the relationship curve of the surface tension of the sample with the concentration. The concentration corresponding to the inflection point is confirmed as the critical micelle concentration of this type of surfactant.
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