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A kind of multiple responsive pickering emulsion and preparation method thereof

A multi-response, emulsion technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of aminohydroxy compounds, etc., can solve the problems of thermodynamic instability, high concentration of surfactants, and difficulty in breaking emulsions.

Active Publication Date: 2022-08-02
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the emulsion stabilized by this type of surfactant is a thermodynamically unstable system, and the stability of the emulsion is poor, and the concentration of the surfactant is higher, generally significantly greater than its critical micelle concentration cmc
The emulsion stabilized by surface-active particles, that is, the Pickering emulsion, has super stability and can maintain long-term stability, and the concentration of the surfactant used is low, but the demulsification of this Pickering emulsion is relatively difficult, and it is difficult to Demulsification within a short period of time, and the selected conventional surfactant will remain in the oil phase, affecting the quality and use effect of the oil phase

Method used

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  • A kind of multiple responsive pickering emulsion and preparation method thereof
  • A kind of multiple responsive pickering emulsion and preparation method thereof
  • A kind of multiple responsive pickering emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1: Preparation of surfactant N-8P-N +

[0059] Surfactant N-8P-N + The synthetic route is as follows:

[0060]

[0061] (1) acyl chlorination reaction: 8-bromooctanoic acid solid (30g, 0.135mol) is added to the there-necked flask that the device for tail gas absorption, the reflux of condenser tube are housed, and three drops of N,N-dimethylformamide (DMF) are added. ) as a catalyst, thionyl chloride (21 g, 0.178 mol) was slowly added dropwise. The reaction temperature was 60 °C, the reaction was performed for 1 h, and the excess thionyl chloride was removed by a rotary evaporator to obtain the intermediate I.

[0062] (2) Amidation reaction: Place dimethylamine hydrochloride (14g, 0.172mol) and triethylamine (50g, 0.494mol) in a low temperature reactor at -10°C, dropwise add Intermediate I (32.61g, 0.135mol) ) in dichloromethane solution, react for 2h after the end, and then extract the reaction solution with water for more than three times to remove exc...

Embodiment 2

[0067] Example 2: Nano-SiO 2 Surface activity test of particles

[0068] In a 25mL glass bottle, weigh 0.007g of commercial nano-SiO 2 Particles (primary particle size is about 20nm, specific surface area S BET About 200±20m 2 / g, see SEM and TEM images figure 2 ), add 7 mL of ultrapure water, and then use an ultrasonic disperser to disperse the particles uniformly. The mass fraction of particles was 0.1% (relative to the aqueous phase). Add 7mL of n-decane to the glass bottle, and then use a high shear homogenizer to rotate and emulsify at 11000r / s for 2min, such as image 3 , a stable emulsion could not be obtained, indicating that the commercial nano-SiO used 2 The particles are not surface active.

Embodiment 3

[0069] Example 3: Preparation of Pickering Emulsion

[0070] Weigh 0.007g of nano-SiO 2 The particles were ultrasonically dispersed in 7mL of N-8P-N with different concentrations +7 mL of n-decane was added to the solution, and after homogeneous emulsification with a high shear homogenizer for 2 min, a stable O / W Pickering emulsion was obtained. like Figure 4 As shown, after the emulsion was placed for one month, no emulsification or demulsification occurred, indicating that the obtained Pickering emulsion had very good stability.

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Abstract

The invention discloses a multi-responsive Pickering emulsion and a preparation method thereof, belonging to the field of colloid and interface chemistry. The Pickering emulsion of the present invention utilizes a rigid group-containing surfactant N-nP-N + with negatively charged nano-SiO 2 The particles are prepared by in-situ hydrophobization to form surface-active particles, by adding acid and alkali or passing CO 2 / N 2 Adjust the structure of the surfactant so that the surfactant N-8P-N + The tertiary amine group on the hydrophobic tail chain intelligently switches between "non-polar" and "polar", making the surfactant N‑8P‑N + Intelligently switch between "active" and "inactive", enabling surface-active particles to intelligently switch between amphiphilic and strong polarity. The whole process is carried out in an aqueous solution, and the introduction of rigid groups makes this conversion more thorough, realizing the recovery and reuse of surfactants, in oil emulsion transportation, emulsion polymerization, nanomaterial synthesis and heterogeneous materials. It has important applications in phase catalysis.

Description

technical field [0001] The invention belongs to the field of colloid and interface chemistry, in particular to a multi-responsive Pickering emulsion and a preparation method thereof. Background technique [0002] Emulsification and demulsification are of great importance in everyday life as well as in industry and technology. For example, some products such as food, cosmetics, pesticide formulations, etc. are emulsions themselves and require long-term stability, while on the other hand, some emulsions such as crude oil emulsions are not expected to be stable and require rapid demulsification. There are also occasions where it is desirable for the emulsion to remain temporarily stable, ie stable for a certain period of time, and then required to be broken. For example, in emulsion polymerization, the emulsion is required to remain stable during the polymerization stage, but after the completion of the polymerization reaction, the emulsion is required to break quickly so that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K23/00C09K23/42C07C213/02C07C217/18
CPCC07C213/02C07C217/18
Inventor 裴晓梅刘佩张金朋崔正刚
Owner JIANGNAN UNIV
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