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A pH-responsive amphiphilic-strong polarity intelligent switching emulsion and its preparation

A strong polarity, emulsion technology, applied in the preparation of organic compounds, the preparation of carboxylic acid amides, the preparation of amino compounds, etc., can solve the problems of surfactant residue, oil phase turbidity, affecting oil phase quality and use effect, etc. achieve good stability

Active Publication Date: 2021-05-04
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in many applications, such as oil transportation in industry, it is necessary to break the emulsion after reaching the destination. However, there is a phenomenon that the surfactant will remain in the oil phase when the emulsion stabilized by the surfactant is broken, so that The oil phase becomes turbid, affecting the quality and use effect of the oil phase

Method used

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  • A pH-responsive amphiphilic-strong polarity intelligent switching emulsion and its preparation
  • A pH-responsive amphiphilic-strong polarity intelligent switching emulsion and its preparation
  • A pH-responsive amphiphilic-strong polarity intelligent switching emulsion and its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: the preparation of tensio-active agent (N-C 16 -N + )

[0047]

[0048] (1) Acid chlorination reaction: Add hexadecanedioic acid (25g, 0.087mol) solid into a three-necked flask equipped with a device for absorbing tail gas and a condenser return pipe, and add a small amount of N,N-dimethylformamide as Catalyst, slowly dropwise add thionyl chloride (26g, 0.22mol). Set the reaction temperature to 60°C, react for 1 h, and remove excess thionyl chloride by rotary evaporation under reduced pressure to obtain product 1.

[0049] (2) Amidation reaction: Place dimethylamine aqueous solution (154g, 1.37mol) in an ice-water bath, add 1 (25g, 0.077mol) of dichloromethane solution dropwise, react for 2 hours after completion, and then dilute the reaction solution with two Chloromethane was extracted 5 times, and the combined extracts were washed with anhydrous Na 2 SO 4 The excess water was removed, the filtrate was obtained by suction filtration, the filtrate...

Embodiment 2

[0053] Embodiment 2: preparation emulsion

[0054] Surfactant N-16-N synthesized with embodiment 1 + Prepare a series of aqueous solutions of different concentrations (0.5mM, 1mM, 2mM, 3mM, 4mM, 5mM, 6mM, 10mM,), respectively take 7mL and add them to a 25mL vial, add 7mL of n-decane, homogenize with a high shear homogenizer After mass emulsification for 2 minutes, a stable O / W emulsion was obtained.

[0055] The result is as image 3 As shown, when the concentration of the emulsion is 5mM, the emulsion can be stabilized for one month without demulsification, and has good stability.

Embodiment 3

[0056] Example 3: N-16-N + Study on Stimulus-Response Properties of Surfactants

[0057] Prepare 5mM N-16-N + Surfactant aqueous solution (pH=10.75), take 7mL and add it to a 25mL vial, take 7mL n-decane, homogenize it with a high shear homogenizer for 2min, form a stable O / W emulsion and place it in a 25°C incubator , pH stimulation-response adjustment was performed after standing for 24 hours.

[0058] Adjust the pH value of the solution. When the pH value is around 3, the emulsion breaks and separates the oil layer. One of the samples takes the upper oil layer and replaces it with fresh n-decane; when the pH value returns to the original value (pH 10.75) After that, homogeneously emulsify again to form a stable emulsion. Such as Figure 4 and 5 As shown, the micrograph of the decane-exchanged emulsion agrees with the micrograph of the un-exchanged emulsion; and by Figure 6 In the NMR analysis, due to the N-C n -N + The solubility in n-decane is poor, and we use tol...

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Abstract

The invention discloses a pH-responsive amphiphilic-strong polarity intelligent conversion emulsion and its preparation, belonging to the field of colloid and interface chemistry. Emulsion of the present invention utilizes amphiphilic surfactant N-C 16 -N + , by adding acid and base to adjust the pH of the solution, the hydrophobic tail chain tertiary amine group of the surfactant can be intelligently switched between "non-polar" and "strong polar", that is, "active" and inactive; It is carried out in aqueous solution without affecting the quality of the oil phase. The reuse and recovery of the surfactant is realized, which is conducive to the realization of environmental friendly goals such as emission reduction and water saving of chemical materials. The emulsion of the invention can be applied in the fields of oil product emulsification transportation, emulsion polymerization, nanometer material synthesis and heterogeneous catalysis.

Description

technical field [0001] The invention relates to a pH-responsive amphiphilic-strong polarity intelligent conversion emulsion and its preparation, belonging to the field of surfactant science and application technology. Background technique [0002] Emulsification and demulsification are important in everyday life as well as in industry and technology. For example, some products such as food, cosmetics, pesticide preparations, etc. are themselves emulsions and require long-term stability. On the other hand, some emulsions such as crude oil emulsions do not want to be stable and require rapid demulsification. There are also occasions where it is desirable for the emulsion to remain temporarily stable, that is, to remain stable for a certain period of time and then required to break the emulsion. For example, in emulsion polymerization, the emulsion is required to be stable during the polymerization stage, but after the polymerization reaction is completed, the emulsion is requ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C209/12C07C211/63B01F17/18F17D1/17C09K23/18
CPCC07C231/02C07C209/48C07C209/12F17D1/17C09K23/00
Inventor 裴晓梅张盛张婉晴宋冰蕾崔正刚
Owner JIANGNAN UNIV
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