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

Inactive Publication Date: 2018-11-13
NANJING POLYTECHNIC INSITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the hydrophobic chain is slightly longer, there is a disadvantage of poor solubility

Method used

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  • Large-head-group quaternary ammonium salt surfactant and preparation method thereof
  • Large-head-group quaternary ammonium salt surfactant and preparation method thereof
  • Large-head-group quaternary ammonium salt surfactant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a large-head-group quaternary ammonium salt surfactant C12NC4 and a synthetic method thereof. The molecular structure of the large-head-group quaternary ammonium salt surfactant C12NC4 is as shown in specification. The molecular structure of the large-head-group-containing quaternary ammonium salt surfactant and the synthetic method are given. The surfactant has good aggregation ability. The surfactant can be used in formulas of oil field chemicals, chemicals for daily use, sterilizing agents, antistatic agent and detergents.

Description

technical field [0001] The invention relates to a large-head group quaternary ammonium salt surfactant and a preparation method thereof, belonging to the field of synthesis and application of surfactants. Background technique [0002] Surfactants are a class of substances that can significantly reduce the surface tension of a solution and form ordered molecular aggregates in the bulk phase when added in a very small amount. From the perspective of molecular structure, surfactants are composed of two parts, one part is a hydrophobic group and the other part is a hydrophilic group, so surfactants are also called amphiphilic molecules. Due to its amphiphilic properties, surfactants can not only adsorb on the interface, but also form ordered aggregates in a solution of a certain concentration, so they have the properties of wetting, emulsifying, solubilizing, washing, and dispersing. In addition to being widely used in daily life and industrial production, surfactants can also ...

Claims

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Application Information

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IPC IPC(8): C07C211/63C07C209/12C07C209/08C07C211/08B01F17/18C09K23/18
CPCC07C209/08C07C209/12C07C211/63C09K23/00
Inventor 林木森张燕萍
Owner NANJING POLYTECHNIC INSITUTE
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