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Low-concentration particle-stabilized switching pickering emulsion and preparation method thereof

A low-concentration, granular technology, applied in the field of Pickering emulsions, can solve the problem of difficulty in the dosage of solid emulsifiers, and achieve the effect of good pH responsiveness and hydrophilic and hydrophobic properties

Active Publication Date: 2022-07-19
四川冠山科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problem that it is very difficult to further reduce the amount of solid emulsifier, and provides a low-concentration particle-stabilized switch Pickering emulsion and a preparation method thereof

Method used

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  • Low-concentration particle-stabilized switching pickering emulsion and preparation method thereof
  • Low-concentration particle-stabilized switching pickering emulsion and preparation method thereof
  • Low-concentration particle-stabilized switching pickering emulsion and preparation method thereof

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preparation example Construction

[0030] A preparation method of a low-concentration particle-stable switching Pickering emulsion, comprising the following steps:

[0031] Disperse 0.8-2g nano-silica nanoparticles in ethanol, preferably 1g nano-silica nanoparticles, add 0.8-3ml silane coupling agent, preferably 1ml silane coupling agent, stir at 55-65°C for 4 After ~6h, centrifuge to obtain the modified nano-silica intermediate product, preferably 65°C, 4h;

[0032] Disperse 1.5-3 g of the modified nano-silica intermediate product and 0.2-1.0 g of acid anhydride in chloroform respectively, preferably 0.5 g of the modified nano-silica intermediate product, preferably 2 g of acid anhydride. Heating to 45-55°C, preferably 50°C, then adding chloroform in which the modified nano-silica intermediate product is dispersed to react for 4-6 hours, preferably 4 hours, centrifugal washing and drying to obtain modified nano-silica particles;

[0033] Disperse the modified nano-silica particles in the oil phase, disperse t...

Embodiment 1

[0042] S1. Preparation of Nano-Silica Particles (SN)

[0043] Mix 300 ml of ethanol, 75 ml of deionized water, 16.8 ml of 25wt% ammonia water and TX-100, and stir at room temperature for 30 minutes; then add 12.8 g of ethyl orthosilicate, and stir at room temperature for 12 hours; Contact angle test, TEM, FTIR, XRD and XPS for SN characterization, the results are as follows figure 1 shown.

[0044] S2. Preparation of modified nano-silica particles (SN-COOH)

[0045] Add 1 g of silica nanoparticles to 10 ml of ethanol and stir for 10 min. Then 1 ml of γ-aminopropyltriethoxysilane (KH-550) was added, and the mixture was stirred at 65° C. for 4 h. After the reaction, the product was centrifuged and washed three times with ethanol solution. Finally, the pure modified nano-silica intermediate (SN-NH) was obtained by centrifugation. 2 ). 2g itaconic anhydride (IAn) and 0.5g SN-NH 2 Disperse into 25ml of chloroform respectively.

[0046] First, add the chloroform solution of it...

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Abstract

The invention discloses a low-concentration particle-stabilized switching Pickering emulsion and a preparation method thereof. The switching Pickering emulsion is obtained by stirring and emulsification of an oil phase and a water phase at 20,000-30,000 r / min; the oil phase includes modified nano-silica particles and oil, and the water phase includes nano-silica particles and water; in the switch Pickering emulsion, the water phase is 30wt% to 70wt%, the oil phase is 70wt% to 30wt%, the nano-silica particles are 0.005wt% to 0.5wt%, and the modified The nano-silica particles are 0.005wt% to 0.5wt%; the modified nano-silica particles are nano-silica particles grafted with carboxyl groups, and the nano-silica particles themselves have no surface activity. Moreover, the Pickering emulsion has pH stimuli responsiveness, and has potential application prospects in realizing the efficient separation of oil and water.

Description

technical field [0001] The invention belongs to the technical field of Pickering emulsions, in particular to a switch Pickering emulsion with stable low concentration particles and a preparation method thereof. Background technique [0002] Ramsden and Pickering in 1903 and 1907 reported an emulsion stabilized by the self-assembly of solid colloidal particles at the oil-water interface. This surfactant-free emulsion exhibits a metastable state, called Pickering emulsion, and its emulsification type mainly depends on which phase preferentially wets the solid particles, usually the first phase that preferentially wets the solid particles is the outer phase. If the solid particles are more easily wetted by the oil phase, the emulsion is of the water-in-oil (W / O) type; on the contrary, if the solid particles are more easily wetted by the water phase, the emulsion is of the oil-in-water (O / W) type. This emulsion has been widely used in various fields because it can avoid the use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K23/00C09K23/54C07F7/08C01B33/16
CPCC07F7/0874C01B33/163C07B2200/11
Inventor 鲁红升张颖王犁杨士农
Owner 四川冠山科技有限公司
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