Easily separated degradable sodium carboxylate surfactant and preparation and performance thereof

Abstract

The invention discloses an easily separated degradable sodium carboxylate surfactant and preparation and performance thereof. The invention discloses an easily separated degradable sodium carboxylate surfactant containing 1,3-dioxane. The surfactant is specifically 5-methyl-2-alkyl-1,3-dioxane-5-carboxylate and has the structural formula shown in the description, wherein a, R=C4H9; b, R=C5H11; c, R=C6H13; d, R=C7H15; e, R=C9H19; f, R=C10H21; and g, R=C11H23. The surfactant is convenient in synthesis, high in yield, small in surface tension and critical micelle concentration and wide in application temperature, serves as an emulsifying agent in an emulsion polymerization solution and is better than the traditional surfactant; and the surfactant is stable under neutral and alkaline conditions, can become sold to be separated out under the alkaline conditions, the separated solid is treated to become the original material which can be recycled, the unexpected foam and emulsification phenomena can be eliminated after the product action is exerted, and the surfactant is a novel environment-friendly product.

Description

technical field [0001] The invention relates to an easily separated and degradable surfactant, in particular to a 5-methyl-2-alkyl-1,3-dioxane-5-carboxylic acid sodium salt surfactant and its preparation and properties. Background technique [0002] Surfactants are widely used in many fields such as daily chemicals, food, textiles, medicine and petroleum. In 2011, the global consumption of surfactants reached 16 million tons. It is estimated that by 2015, the demand for global surfactants (excluding soap class) will reach 20 million tons. These surfactants are discharged into the water and ground environment after use, which not only directly leads to serious soil and water pollution, but also inhibits the degradation of other toxic substances, and even brings harm to the human body. Therefore, the separation or degradation performance of surfactants has attracted more and more attention. [0003] On the basis of its own structure, the surfactant introduces functional grou...

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Problems solved by technology

[0009] At present, there are few literature reports on cyclic acetal surfactants, and most of them are five-membered ring acetals formed by the condensation of aldehydes and 1,2-diols Type surfactants, six-membered ring acetal type surfactants formed by condensation of aldehydes and 1,3-diols, except for some work done by this research group, only found a few literature reports, such as Sawomir Karczewski et al. ( See Sawomir, K.; Andrzej, P.; Irena, M.; J. Surfact Deterg,, 2008, 201) using diethyl 2,2-dimethylolmalonate with three aldehydes (octylal, decanal Acid and dodecanal) condensation, then react with 3-(N',N'-dimethyl)-propylenediamine to synthesize bisamide, and then oxidize with hydrogen peroxide Double-headed (hydrophilic) type surfactants were obtained, but the literature only studied their synthesis, surface tension, cmc and foaming properties, but did not report on their degradation properties

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