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Synthesis method of lauramidopropyl betaine

A technology of lauroamidopropyl betaine and a synthesis method, which is applied in the field of surfactant preparation, can solve the problems of difficulty in separating sodium chloride, increase product viscosity, and limit mass fraction, etc., and achieves convenient operation, reduced surface tension, and low viscosity. Effect

Inactive Publication Date: 2018-04-06
SHAANXI QIYUAN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quaternization reaction of the traditional synthesis method is carried out in the water system, because of the presence of solvent water, a gel region will be produced during the synthesis, and the gel region produced by the concentration is too high to be difficult to transition, resulting in the mass fraction of the product being limited to 30 %~35%; In addition, the sodium chloride in the product will also be dissolved in the system, resulting in about 7% of sodium chloride being difficult to separate. Excessively high sodium chloride will not only increase the viscosity of the product, but also limit its use in the formula The application will also cause discomfort to the skin

Method used

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Effect test

Embodiment 1

[0011] The synthetic method of lauryl amidopropyl betaine of the present invention is characterized in that, comprises the following steps:

[0012] The first step is the amidation reaction. First, add lauric acid into the reactor, heat up and melt under the protection of nitrogen, then slowly add N,N-dimethyl-1,3-propylenediamine dropwise, and gradually raise the temperature to 160°C. After reacting for 6 h, measure the acid value of the system, stop the reaction when the acid value drops to a stable value, and remove the residual amine, acid and water in the system under reduced pressure after the reaction is completed;

[0013] The second step is the quaternization reaction. Firstly, after dissolving the amido tertiary amine prepared in the first step with ethanol, after heating, add sodium chloroacetate in an equal amount in batches, and finish the reaction after 5 h, and filter the residue after the reaction. The ethanol in the filtrate was distilled off to obtain the lig...

Embodiment 2

[0015] The synthetic method of lauryl amidopropyl betaine of the present invention is characterized in that, comprises the following steps:

[0016] The first step is the amidation reaction. First, add lauric acid into the reactor, heat up and melt under the protection of nitrogen, then slowly add N,N-dimethyl-1,3-propylenediamine dropwise, and gradually raise the temperature to 160°C. After reacting for 6 h, measure the acid value of the system, stop the reaction when the acid value drops to a stable value, and remove the residual amine, acid and water in the system under reduced pressure after the reaction is completed;

[0017] The second step is the quaternization reaction. Firstly, after dissolving the amido tertiary amine prepared in the first step with ethanol, after heating, add sodium chloroacetate in an equal amount in batches, and finish the reaction after 5 h, and filter the residue after the reaction. The ethanol in the filtrate was distilled off to obtain the lig...

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Abstract

The invention relates to the field of surfactant preparation, and specifically relates to a synthesis method of lauramidopropyl betaine. The synthesis method comprises the following steps: amidation reactions: at first, adding lauric acid into a reactor, heating lauric acid to melt lauric acid under the protection of nitrogen, slowly dropwise adding N,N-dimethyl-1,3-propane diamine, slowly raisingthe temperature to 160 DEG C, carrying out reactions for 6 hours, then measuring the acid value of the system, when the acid value decreases to a stable value, stopping the reactions, and after reactions, reducing the pressure to remove amines, acids, and water in the system. The operation is convenient, the technology is simple, the product purity is high, the active substance content can reach82.0%, and the product is in a solid state, can be directly used, and can be dissolved to obtain a water solution with a proper concentration. The synthesized lauramidopropyl betaine can obviously reduce the surface tension of water, the critical micelle concentration is low, the water solution of lauramidopropyl betaine has low viscosity, and lauramidopropyl betaine can be made into water solutions with various concentrations according to the needs.

Description

Technical field [0001] The invention relates to the field of surfactant preparation, and specifically to a synthesis method of lauramidopropyl betaine. Background technique [0002] Lauramidopropyl betaine is a multifunctional amphoteric surfactant that is widely used in fabric printing and dyeing auxiliaries and washing formulas. It is the main ingredient in many softeners, detergents, and finishing agent formulas. It is irritating to the skin. Small, mild performance, easy to biodegrade, better than other amphoteric surfactants [1-2]. In addition, it also has excellent decontamination, foaming and conditioning properties, can be combined with some anionic and cationic surfactants, has a good thickening effect, and has an increasingly wide range of applications. Commercially available lauramidopropyl betaine products are all aqueous solutions with an active substance content of 30% to 35%. This is due to limitations of its synthesis method. The quaternization reaction of ...

Claims

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Application Information

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IPC IPC(8): C07C231/12C07C233/36C07C231/24
CPCC07C231/02C07C231/12C07C231/24C07C233/36
Inventor 张淑芬
Owner SHAANXI QIYUAN TECH DEV
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