A kind of dicarboxy surfactant with anion-cation reversal ability and preparation method thereof

Abstract

The invention discloses a dicarboxyl surfactant with anion-cation reversal capability and a preparation method thereof. The preparation method comprises: 1) adding dodecylamine and cyclobut-3-enedicarboxylic anhydride into a three-necked flask, and passing nitrogen gas , undergo nucleophilic addition-elimination reactions to generate imides; followed by LiAlH 4 Reducing the carbonyl group as a reducing agent. 2) Dilute the above product, slowly add potassium permanganate, heat up for oxidation reaction to generate carboxyl groups, add sodium sulfite to remove excess potassium permanganate after the reaction is completed, filter with diatomaceous earth and extract impurities with ethyl acetate, collect the water phase , adjust the pH to 2-4 to precipitate the product, filter and dry to constant weight to obtain the final product. The surfactant has excellent anion-cation reversal characteristics, and can change the surfactant type according to the external environment. When the external environment is alkaline, it is an anionic surfactant, and when the external environment is acidic, it is a cationic surfactant.

Description

A kind of double carboxyl surfactant with anion and cation inversion ability and preparation thereof method technical field The invention belongs to the field of functional surfactants, particularly a kind of dicarboxylate with anion and cation inversion ability Base surfactants and methods of making the same. Background technique Surfactant refers to the amphiphilic compound containing non-polar lipophilic group and polar hydrophilic group in molecular structure. It can form a directional arrangement at the gas-liquid and solid-liquid interface. Adding a small amount to the solution can significantly reduce the surface tension of the solution. It can effectively change the physical and chemical properties of the interface. Therefore, it is widely used in daily life, industry and agriculture, and high-tech fields. One of the important industries for learning craftsmanship. Surfactant industry still exists due to its weak foundation for a long time There are def...

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Problems solved by technology

Due to the weak foundation of the surfactant industry for a long time, the surfactants still have defects such as single variety, simple structure, and backward technology, especially the high-end surfactant products and technologies, which still have a big gap with foreign countries

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