Gemini ampholytic surfactant with flexible linking group and preparation method thereof

A surfactant, flexible connection technology, applied in chemical instruments and methods, dissolution, chemical/physical processes, etc., can solve the requirements of high synthesis conditions, few reports of amphoteric gemini surfactants, and large scale gemini surfactants. Expensive raw materials are used to achieve the best surface properties, a wide range of pH values, and increased stability.

Inactive Publication Date: 2011-08-31
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the main factors that limit the large-scale application of gemini surfactants are expensive raw materials and high requirements for synthesis conditions, and there are only a few truly industrialized products.
As far as the current reports are concerned, cationic gemini surfactants are the most studied and most active, and there are few reports on amphoteric gemini surfactants linked by flexible linkers, which are still in the research and development stage.

Method used

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  • Gemini ampholytic surfactant with flexible linking group and preparation method thereof
  • Gemini ampholytic surfactant with flexible linking group and preparation method thereof
  • Gemini ampholytic surfactant with flexible linking group and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 50g (0.27mol) of dodecylamine, 19.32g (0.13mol) of dichloroethyl ether, and 1.6g (0.005mol) of tetrabutylammonium bromide and dissolve them in 100mL of toluene to make a solution. 1. In the 500ml four-necked flask of the condensing device, heat up to 75°C, dissolve 10.80g (0.27mol) of NaOH in 100ml of water to make a solution, add dropwise through the dropping funnel for about 0.5h, and continue to reflux and stir for 5h after the addition is complete. After the reaction was completed, layers were separated in a separatory funnel, the aqueous layer was extracted with toluene and combined into the organic phase, the organic phase was washed with water until neutral and dried with anhydrous calcium chloride, and the solvent was distilled off under reduced pressure to obtain a light yellow solid product N, N'--20 Dialkyl-3-oxa-1,5-pentanediamine. Its infrared spectrum is as figure 1 shown.

[0044] Weigh 18.9g (0.2mol) of chloroacetic acid and 16g (0.4mol) of NaOH ...

Embodiment 2

[0047]Weigh 100g (0.54mol) of dodecylamine, 30.89g (0.13mol) of dibromoethyl ether, and 1.82g (0.005mol) of cetyltrimethylammonium bromide and dissolve them in 100mL of absolute ethanol to make a solution, add Put it into a 500ml four-necked flask equipped with mechanical stirring, a thermometer, and a condensing device, raise the temperature to 70°C, dissolve 10.80g (0.27mol) of NaOH in 100ml of water to make a solution, add dropwise to the dropping funnel for about 0.5h, add dropwise Continue to reflux and stir the reaction for 5h, after the reaction is completed, separate layers in the separatory funnel, extract the water layer with toluene and merge it into the organic phase, wash the organic phase with water until neutral and dry with anhydrous calcium chloride, remove the solvent by distillation under reduced pressure to obtain a light yellow solid product N,N'-behenyl-3-oxa-1,5-pentanediamine.

[0048] Weigh 21.7g (0.2mol) of 3-chloropropionic acid and 22.4g (0.4mol) of...

Embodiment 3

[0050] Weigh 145.26g (0.54mol) octadecylamine, 30.89g (0.13mol) dibromoethyl ether, cetyltrimethylammonium bromide 1.82g (0.005mol) and dissolve in 100mL cyclohexane to make a solution, add Put it into a 500ml four-necked flask equipped with mechanical stirring, a thermometer, and a condensing device, raise the temperature to 75°C, dissolve 10.80g (0.27mol) of NaOH in 100ml of water to make a solution, add it dropwise to the dropping funnel for about 0.5h, add dropwise Continue to reflux and stir the reaction for 4h. After the reaction is completed, separate layers in the separatory funnel, extract the water layer with toluene and merge it into the organic phase, wash the organic phase with water until it is neutral and dry with anhydrous calcium chloride, and distill off the solvent under reduced pressure to obtain a light yellow solid product N,N'-octadecyl-3-oxa-1,5-pentanediamine.

[0051] Weigh 27.8g (0.2mol) of bromoacetic acid and 16g (0.4mol) of NaOH and dissolve them ...

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PUM

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Abstract

The invention discloses a novel gemini ampholytic surfactant with flexible linking group, which is a novel emini ampholytic surfactant using aether dihalide as a linking group and has a chemical name of N,N'-dialkyl-N,N'-dicarboxy-3-oxa-1,5-pentamethylene diamine. The surfactant obtains an intermediate product N,N'-dialkyl-3-oxa-1,5-pentamethylene diamine through reaction of the aether dihalide and primary aliphatic amine; and the intermediate product performs a condensation reaction with halogenated carboxylic acid to obtain the final product. The surfactant aqueous solution has low surface tension, has excellent performance in foam forming and foam stabilization, has good compound performance with a non-ionic surfactant and simple synthesis process, and is expected to be popularized andused.

Description

technical field [0001] The invention relates to a surfactant and a preparation method thereof, in particular to a gemini-type amphoteric surfactant with a flexible linker and a preparation method thereof. Background technique [0002] Compared with ordinary surfactants, gemini surfactants connect two hydrophilic groups together by linking groups, which makes it easier to generate strong interactions between alkyl chains, and at the same time inhibits the tendency of mutual repulsion between hydrophilic groups , greatly improved the surface activity, and thus known as a new generation of surfactants. Therefore, the intervention of the linking group and the changes in its chemical structure, linking position, degree of rigidity, and chain length will make the structure of the gemini surfactant diversified, and then affect the properties of its solution and interface. To make it have more excellent physical and chemical properties. Compared with traditional surfactants, gemini...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01F17/16C09K23/16
Inventor 陈洪龄孙永明
Owner NANJING TECH UNIV
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