Alpha-lauryl betaine type dimeric surfactant and synthesis method thereof

An alkyl betaine, gemini surface technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problem of poor selectivity of double long chain tertiary amines, product purity and product performance discount, short chain binary The source of secondary amine raw materials is not easy to achieve the effect of good environmental friendliness, good industrial application prospects, and low raw material sources

Inactive Publication Date: 2016-08-24
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the source of raw materials for short-chain secondary secondary amines is not easy, and the selectivity of the reaction between secondary secondary amines and long-chain halogenated alkanes to form double long-chain tertiary amines is poor, which greatly reduces the purity of the final product and the performance of the product.

Method used

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  • Alpha-lauryl betaine type dimeric surfactant and synthesis method thereof
  • Alpha-lauryl betaine type dimeric surfactant and synthesis method thereof
  • Alpha-lauryl betaine type dimeric surfactant and synthesis method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The synthesis of embodiment 1 α-decyl betaine type gemini surfactant

[0029] Add 5.0g α-chlorododecanoic acid and 20mL deionized water in a 50mL flask, neutralize the mixed solution to pH 7 with sodium hydroxide solution; slowly add 0.27g tetramethylpropylenediamine dropwise to the system, and The reaction was incubated at ℃ for 48 hours. After the reaction, adjust the acidity and alkalinity of the system to pH 7; after volatilizing the water in the system, add an appropriate amount of absolute ethanol to remove the generated sodium chloride; wash the filter cake with a small amount of water, and the reaction crude product yield is 97.5%; The filter cake was recrystallized with ethanol to obtain a pure product with a yield of 97.5%. The calcium soap of this product has good dispersibility, and its calcium soap dispersion index LSDP is 1%. The foaming performance and foam stabilizing performance of this product are good, and the foam height measured by the Roche foam ...

Embodiment 2

[0030] Embodiment 2 Synthesis of α-hexadecyl betaine type gemini surfactant

[0031] Add 7.7g α-bromo octadecanoic acid and 20mL deionized water in a 50mL flask, neutralize the mixed solution to pH 10 with sodium hydroxide solution; slowly add 0.22g tetramethylethylenediamine dropwise to the system, and The reaction was incubated at ℃ for 48 hours. After the reaction, adjust the acidity and alkalinity of the system to pH 7; after volatilizing the water in the system, add an appropriate amount of absolute ethanol to remove the generated sodium chloride; wash the filter cake with a small amount of water, and the reaction crude product yield is 99.3%; The filter cake was recrystallized with ethanol to obtain a pure product with a yield of 75.4%. The critical micelle concentration of the pure product after crystallization is extremely low, which is 2.5*10 -5 mol / L.

Embodiment 3

[0032] Embodiment 3 The synthesis of α-dodecyl betaine type gemini surfactant

[0033] Add 7.1g of α-chlorotetradecanoic acid and 20mL of absolute ethanol in a 50mL flask, neutralize the mixed solution to pH 9 with solid sodium hydroxide; slowly add 0.22g of tetramethylethylenediamine dropwise to the system, and The reaction was incubated at ℃ for 24 hours. After the reaction was finished, the pH of the system was adjusted to neutral and the generated sodium chloride was removed by filtration. The yield of the crude product was 87.0%; the filter cake was recrystallized with ethanol to obtain a pure product, and the yield of the reaction was 50.6%. The calcium soap of this product has good dispersibility, and its calcium soap dispersion index LSDP is 3%.

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Abstract

The invention relates to an alpha-lauryl betaine type dimeric surfactant which is synthesized at a high yield through a reaction of alpha-halogenated aliphatic acid and binary tertiary amine. The synthesis reaction of the ampholytic ionic dimeric surfactant is a high-atom-economy reaction. The ampholytic ionic dimeric surfactant is short in synthesis route, easy and convenient to process, high in product yield and excellent in technological route synthesis performance. No corrosion or pollution is caused in the technological process, and no harmful compound is generated in the technological process, so that the synthesis technology is good in environmental friendliness. According to the method, raw materials are wide in source and low in cost, the technological route is short, production cost is low, and economy is good. The ampholytic ionic surfactant has extremely low critical micelle concentration and high capability for reducing surface tension and interfacial tension; the obtained product is excellent in lime soap dispersivity and can serve as a novel lime soap dispersant.

Description

technical field [0001] A method for preparing an α-alkyl betaine type amphoteric gemini surfactant, specifically a method for preparing an α-alkyl betaine type amphoteric gemini surfactant by reacting an α-halogenated carboxylic acid and a dibasic tertiary amine as raw materials , belongs to the technical field of organic compound synthesis. Background technique [0002] The development and application of gemini surfactants is one of the research hotspots at home and abroad. Compared with traditional surfactants, gemini surfactants have special gas / liquid interface adsorption behavior and special aggregation to form micelles, so they are particularly prominent in improving the efficiency and effectiveness of surfactants in reducing surface tension. Amphoteric surfactants have low toxicity and low irritation to skin and eyes; excellent resistance to hard water and high-concentration electrolyte; good biodegradability; softness and antistatic properties; Mildew resistance; g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C229/16C07C227/08B01F17/18C09K23/18
Inventor 胡学一陈泽阳杜鹏飞张童童陈苗苗方云
Owner JIANGNAN UNIV
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