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Anionic gemini surfactant and preparation method thereof

A gemini surface, anionic technology, applied in chemical instruments and methods, dissolution, chemical/physical processes, etc., can solve the problems of gemini surfactant cost-effectiveness to be improved, and achieve low cost, simple synthesis process, and easy biodegradation Effect

Inactive Publication Date: 2018-10-19
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, although there are many types of developed gemini surfactants, the cost performance of existing gemini surfactants needs to be improved.

Method used

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  • Anionic gemini surfactant and preparation method thereof
  • Anionic gemini surfactant and preparation method thereof
  • Anionic gemini surfactant and preparation method thereof

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preparation example Construction

[0032] The present invention provides the preparation method of anionic gemini surfactant described in above-mentioned technical scheme, comprises the following steps:

[0033] (1) tartaric acid, thionyl chloride and solvent are mixed, carry out esterification reaction, obtain tartrate diester;

[0034] (2) mixing the tartrate diester, solvent and fatty amine for amidation reaction to obtain tartrate amide;

[0035] (3) Place the tartaric acid amide in a reactor, add an anionic reagent dropwise in an ice-water bath under a protective atmosphere, react directly or under the action of a catalyst, and then neutralize it with an alkali to obtain an anionic tartrate amide Gemini surfactants.

[0036] The present invention mixes tartaric acid, thionyl chloride and a solvent for esterification to obtain tartrate diester. In the present invention, the tartaric acid is preferably L-tartaric acid. In the present invention, the solvent is preferably ethanol or methanol, more prefera...

Embodiment 1

[0070] Mix absolute ethanol (70 mL) and diethyl tartrate (20.6 g, 0.1 mol), add n-octylamine (27.1 g, 0.21 mol) dropwise under stirring, heat the oil bath to reflux, and react for 8 h. After the reaction solution was completely cooled to room temperature, it was washed three times with 150 mL of absolute ethanol to obtain a white solid; then recrystallized with 200 mL of absolute ethanol to obtain needle-like white crystals, which obtained octaamide tartrate with a yield of (31.25 g, 84.0%) .

[0071] The tartrate octaamide (1.86g, 5mmol) and propane sultone (1.83g, 15mmol) were mixed, and 60% sodium hydride (0.6g, 30mmol) and no Water tetrahydrofuran (70mL), in which sodium hydride was added in three times on average, reacted at room temperature for 48h, after the reaction was completed, 10mL of 10% ammonium chloride solution was added to remove excess sodium hydride, tetrahydrofuran was removed by rotary evaporation, and dried in a vacuum oven to constant weight to obtain c...

Embodiment 2

[0076] Anhydrous ethanol (70mL) was mixed with diethyl tartrate (20.6g, 0.1mol), and n-decylamine (33.0g, 0.21mol) was added dropwise under stirring; then the oil bath was heated to reflux, and the reaction was carried out for 8 hours. After the reaction solution was completely cooled to room temperature, it was washed three times with 150 mL of absolute ethanol to obtain a white solid; then recrystallized with 200 mL of absolute ethanol to obtain decanamide tartrate with a yield of (35.57 g, 83.1%).

[0077] The tartrate decanamide (1.86g, 5mmol) and propane sultone (1.83g, 15mmol) were mixed, and in a nitrogen atmosphere, 60% sodium hydride (0.6g, 30mmol) and no Water tetrahydrofuran (70ml), in which sodium hydride was added in three times on average, reacted at room temperature for 48h, after the reaction was completed, 10mL of 10% ammonium chloride solution was added to remove excess sodium hydride, tetrahydrofuran was removed by rotary evaporation, and dried in a vacuum ov...

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Abstract

The invention provides an anionic gemini surfactant. The preparation method comprises the following steps: taking tartaric acid and fatty amine as raw materials, synthesizing tartramide, grafting anion groups to two secondary alcohols of tartramide by virtue of an etherification reaction, a substitution reaction or an esterification reaction and the like, and synthesizing the tartramide anionic gemini surfactant. The gemini surfactant has high capacity of reducing the aqueous solution surface tension, and the critical micellar concentration value is 10<-5> order of magnitudes. The used raw materials of the surfactant are readily available, the tartaric acid is natural, non-toxic and biodegradable, the synthetic process is simple, the cost is low, and since the product contains the amide group, the product is easy for biodegradation after use and emission.

Description

technical field [0001] The invention relates to the technical field of surfactants, in particular to an anionic gemini surfactant and a preparation method thereof. Background technique [0002] Gemini surfactants are new types of surfactants with a double hydrophilic group-double lipophilic group structure. According to the type of hydrophilic group, gemini surfactants can be divided into four types: anionic, cationic, nonionic and amphoteric. Because of its unique structure, gemini surfactants have low critical micelle concentration and Krafft point, high surface activity, excellent water solubility and salt tolerance, and are a new generation of surfactants with great application prospects. [0003] In the past 20 years, the synthesis and performance research of gemini surfactants at home and abroad have been in-depth, and many types of gemini surfactants have been synthesized. In view of factors such as environmental protection and product ecological safety, the gemini s...

Claims

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Application Information

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IPC IPC(8): B01F17/22B01F17/14B01F17/44C09K23/22C09K23/14C09K23/44
CPCC09K23/14C09K23/00
Inventor 丁凤美周翔王辉邢志奇
Owner DONGHUA UNIV
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