Nonylphenol polyoxyethylene ether trimeric surfactant using piperazine as connecting group

Abstract

The invention discloses a nonylphenol polyoxyethylene ether nonionic surfactant and a preparation method thereof. The structural formula of the substance is as the following right formula, wherein the addition mole number m is 4, 7, 10, 15, 20 or 30. The preparation method for the surfactant comprises the following steps: adding intermediate 2,6-di{N-[N'-(2-hydroxy-5-nonylphenmethyl)piperazinyl] methyl}-4-nonylphenol and 1 percent of potassium hydroxide in percentage by mass of the intermediate into an autoclave, introducing oxacyclopropane of 3m according to the addition mole number m of the ethylene oxide group into the autoclave, heating the mixture to between 120 and 180 DEG C under stirring, reacting the mixture for 2 hours at a pressure of 1MPa, stopping reaction, and cooling a reaction product to obtain a product. The synthetic method has clear route, the synthesized product has an accurate structure, the crystallization degree of the intermediate is high, the product is easy to be separated, the generation of other byproducts is effectively avoided, and a novel trimeric nonylphenol polyoxyethylene ether surfactant is provided for the industry of fine chemicals.

Description

technical field [0001] The invention relates to a non-ionic nonylphenol polyoxyethylene ether trimerized surfactant with piperazine as a connecting group and a preparation method thereof, belonging to a non-ionic nonylphenol polyoxyethylene ether surfactant and its preparation method. Background technique [0002] There are few reports in the literature that three identical or different surfactant monomer molecules are connected together by chemical bonds with linking groups to form trimeric surfactants. US 3919429 proposes to use hydrochloric acid, sulfuric acid, phosphoric acid and oxalic acid as catalysts, alkylphenol and formaldehyde condensation reaction, and rely on distillation dehydration to remove acid to obtain alkylphenol aldehyde polymer intermediates, and then use ethylene oxide addition, can prepare A polymeric surfactant with a degree of polymerization of 1-9. CN 200510126038.4 proposes to use potassium hydroxide as a catalyst, and to condense nonylphenol wi...

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Problems solved by technology

[0003] The main disadvantages of the above method in the process of preparing polymeric surfactants are: due to the use of distillation dehydration to remove acid, not only the acid cannot be removed cleanly, which affects the quality of subsequent products, but also the acidic water vapor has strong corrosion on equipment Effect; use NaHCO 3 Washing the phenolic trimer product obtained by using potassium hydroxide as a catalyst with aqueous solution and saturated salt water requires a large amount of washing liquid, and the subsequent treatment of a large amount of wastewater will greatly increase the production cost of the product and easily lead to environmental pollution; using solid acid Catalysis requires high reaction temperature and high energy consumption

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