Method for synthesizing Pickering-type emulsion through semi-continuous polymerization

A semi-continuous, emulsion technology used in the field of polymer polymerization to improve nucleation efficiency

Inactive Publication Date: 2015-04-29
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the formation of Pickering-type emulsions, a large mass proportion of solid particles (> 2 wt%, relative to the mass percentage of the continuous phase) is required; due to the transfer process of monomers through the water phase in emulsion polymerization, the nucleation efficiency is low, The latex particles are relatively large (> 500 nm), and the conditions for solid particles to form a protective layer on the surface of the latex particles are more complicated

Method used

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  • Method for synthesizing Pickering-type emulsion through semi-continuous polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The aggregation steps are as follows:

[0024] (1) Preparation of water phase:

[0025] 100 g of deionized water and 0.1 g of acrylic acid monomer were used to form a mixed solution, and 2.0 g of commercially available gas-phase solid silica particles with a particle size of 15 nm were added, and pulverized by a 450w ultrasonic crusher for 60 minutes to mix the silica evenly.

[0026] (2) Preparation of dripping components for semi-continuous emulsion polymerization:

[0027] Add 1.0 g of styrene monomer to 10 g of the water phase prepared in step (1), and disperse the monomer by ultrasonic crushing and emulsification. The dispersion process is cooled with ice water to avoid polymerization during the dispersion process.

[0028] (3) Preparation of Pickering type emulsion by semi-continuous emulsion polymerization:

[0029] Put the remaining 90g of the water phase prepared in step (1) into the reactor, start stirring, and use a two-leaf folding paddle (θ=45°, paddle di...

Embodiment 2

[0032] The aggregation steps are as follows:

[0033] (1) Preparation of water phase:

[0034] 100 g of deionized water and 5.0 g of acrylic acid monomer were mixed to form a mixed solution, 0.1 g of commercially available fumed silica particles with a particle size of 15 nm were added, and the silica was pulverized by a 450w ultrasonic crusher for 30 minutes to mix the silica evenly.

[0035] (2) Preparation of dripping components for semi-continuous emulsion polymerization:

[0036] Add 180.0g of styrene monomer to 90g of the water phase prepared in step (1), and disperse the monomer by means of ultrasonic crushing and emulsification. The dispersion process is cooled with ice water to avoid polymerization during the dispersion process.

[0037] (3) Preparation of Pickering type emulsion by semi-continuous emulsion polymerization:

[0038] Put the remaining 10g of the water phase prepared in step (1) into the reaction kettle, start stirring, and use a two-leaf folding paddl...

Embodiment 3

[0040] The aggregation steps are as follows:

[0041] (1) Preparation of water phase:

[0042] 100 grams of deionized water, 1.0 g of acrylic acid and 1.0 g of N,N-dimethylaminoethyl methacrylate monomers are mixed to form a mixed solution, and 0.5 g of commercially available gas-phase solid silica particles with a particle size of 15 nm are added. Stir and shear at 6000r / min to disperse and emulsify for 30 minutes to mix the silica evenly.

[0043] (2) Preparation of dripping components for semi-continuous emulsion polymerization:

[0044] Mix 10.0 g of 5.0 g of methyl methionate monomer and 5.0 g of styrene monomer for later use.

[0045] (3) Preparation of Pickering type emulsion by semi-continuous emulsion polymerization:

[0046] Put 100g of the water phase prepared by step (1) in the reaction kettle, start stirring, and use a two-leaf folding paddle (θ=45°, paddle diameter / kettle body diameter=0.7, paddle thickness / blade diameter= 0.2), the stirring rate is 90 r / min. ...

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Abstract

The invention discloses a method for synthesizing a Pickering-type emulsion through semi-continuous polymerization, and belongs to the field of high molecule polymerization. The method comprises the following steps: preparing a water phase, preparing a dropping component for semi-continuous emulsion polymerization, and preparing the Pickering-type emulsion through the semi-continuous emulsion polymerization, namely obtaining the Pickering-type emulsion. By the method, the using proportion (0.1-2.0wt%) of solid particles can be obviously reduced, latex particles with the size being about 100 nm can be formed, the coating form of the solid particles on the surfaces of the latex particles is intact, and the stability of the emulsion is high.

Description

[0001] Technical field: [0002] The invention belongs to the field of macromolecule polymerization, and in particular relates to the preparation of Pickering type emulsion by using a method of semi-continuous emulsion polymerization. [0003] Background technique: [0004] Emulsions or emulsions (emulsions) are dispersed systems composed of two immiscible liquid phases (continuous phase and dispersed phase) using a surface-active emulsifier. Generally, traditional emulsifiers are divided into anionic emulsifiers, cationic emulsifiers, amphoteric emulsifiers and nonionic emulsifiers. The research on emulsifiers and emulsifying systems is more mature; while the research on Pickering type emulsions is relatively less. The so-called Pickering type emulsion refers to the use of solid particles of a certain size to stabilize the emulsion or emulsion, and to form a single-layer or multi-layer film formed by solid particles at the oil-water interface. [0005] The Pickering type...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F220/06C08F220/34C08F220/14C08F220/28C08F218/08C08F220/56C08F220/18C08F2/44C08K3/36C08K3/22
Inventor 张震乾方必军李坚薛小强张帅
Owner CHANGZHOU UNIV
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