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Method for preparing large-particle monodispersed high-stable polymer emulsion by CO2 induced in-situ charge neutrality technology

A polymer emulsion and large particle size technology, applied in the field of emulsion polymerization, can solve the problems of long production cycle, high cost, complex production equipment, etc., and achieve the effects of reducing the number, enhancing particle stability, and improving surface potential

Active Publication Date: 2017-05-10
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production efficiency of its microfluidic reactor is low, and the solid content of the product is low, which is difficult to meet the needs of the consumer market; in the US patent US 8657733B2 "preparation process of monodisperse polymer particles", the seed swelling technology is used under the condition of static pressure , to diffuse the reactive monomers and initiators into the interior of the seed particles, make them swell and polymerize inside the latex particles, and finally prepare monodisperse polymer latex particles
The size of the latex particles prepared by this method is precisely controlled, but the production cycle is long, the production equipment is complicated, and the cost is high

Method used

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  • Method for preparing large-particle monodispersed high-stable polymer emulsion by CO2 induced in-situ charge neutrality technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) In parts by mass, monomer styrene 40g, CO 2 Add 0.2g of diethylaminoethyl methacrylate monomer, 0.6g of emulsifier sodium lauryl sulfate, 0.2g of silicone defoamer polydimethylsiloxane, and 0.4g of reducing agent sodium sulfite into the reaction kettle , add 60 g of deionized water, and stir to completely dissolve the reactants;

[0020] (2) Pass CO into the above reaction system 2 Gas for 40min to make it CO 2 Form carbonic acid with water to ensure that the pH of the reaction system is less than 5, thereby promoting CO 2 Response to monomer salt formation. On the other hand, CO 2 The introduction of gas will remove the air in the reactor, so that the whole reaction is carried out under CO 2 carried out under gas protection.

[0021] (3) After raising the temperature to 45°C, 0.6 g of ammonium persulfate initiator was added to initiate the polymerization reaction. After the reaction was carried out for 1 hour, N 2 Replace CO in the system 2 Gas, maintain 4...

Embodiment 2

[0023] (1) In parts by mass, monomer styrene 40g, CO 2 The response monomer diethylaminoethyl methacrylate 0.4g, emulsifier sodium dodecylbenzene sulfonate 0.6g, silicone defoamer polydimethylsiloxane 0.2g, reducing agent sodium sulfite 0.4g were added to In the reaction kettle, add 60 g of deionized water, and stir to completely dissolve the reactant;

[0024] (2) Pass CO into the above reaction system 2 Gas for 40min to make it CO 2 Form carbonic acid with water to ensure that the pH of the reaction system is less than 5, thereby promoting CO 2 Response to monomer salt formation. On the other hand, CO 2 The introduction of gas will remove the air in the reactor, so that the whole reaction is carried out under CO 2 carried out under gas protection.

[0025] (3) After raising the temperature to 45°C, 0.6 g of ammonium persulfate initiator was added to initiate the polymerization reaction. When the reaction was carried out for 1.5 hours, N 2 Replace CO in the system 2 ...

Embodiment 3

[0027] (1) In parts by mass, monomer styrene 20g, methyl methacrylate 20g, CO 2 The response monomer diethylaminoethyl methacrylate 0.4g, emulsifier sodium dodecylbenzene sulfonate 0.6g, silicone defoamer polydimethylsiloxane 0.1g, reducing agent sodium sulfite 0.4g were added to In the reaction kettle, add 60 g of deionized water, and stir to completely dissolve the reactant;

[0028] (2) Pass CO into the above reaction system 2 Gas for 40min to make it CO 2 Form carbonic acid with water to ensure that the pH of the reaction system is less than 5, thereby promoting CO 2 Response to monomer salt formation. On the other hand, CO 2 The introduction of gas will remove the air in the reactor, so that the whole reaction is carried out under CO 2 carried out under gas protection.

[0029] (3) Add 0.6 g of ammonium persulfate as an initiator after raising the temperature to 45° C. to initiate polymerization. When the reaction was carried out for 1.5 hours, N 2 Replace CO in t...

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Abstract

The invention discloses a method for preparing large-particle monodispersed high-stable polymer emulsion by a CO2 induced in-situ charge neutrality technology, and belongs to the technical field of the emulsion polymerization. In order to solve the technical problem, the method is capable of adding CO2 response monomer to a polymerization formula system, enabling the CO2 response monomer to change to be salt while the CO2 gas is pumped in, converting from the electric neutrality to the positive charge, wherein the part of the positive charge can partially neutralize the negative charge of anionic surfactant on the surface of the emulsion particles exactly, reducing the stability of the particles, promoting the particles to generate aggregation, reducing the particle number of the particle nucleating stage, and increasing the particle size. Because the particle aggregation is generated in the initial stage of the particle nucleating stage, the particle size distribution of the final emulsion is narrowed by the competition increase and self-sharpening of the aggregated particles. Finally, the CO2 is removed by adding N2, so that the CO2 response monomer is changed from the positive charge to the neutral, and the goal of high stability is realized.

Description

technical field [0001] The invention belongs to the technical field of emulsion polymerization, and specifically relates to a CO 2 A method for preparing large particle size, monodisperse and highly stable polymer emulsions by inducing in-situ electrical neutralization technology. Background technique [0002] Emulsion polymerization technology is a method of traditional free radical polymerization technology, which has been widely used in plastics preparation, rubber synthesis, coating development, adhesive processing, papermaking, textile and other fields. At present, the annual consumption of emulsion products in the world is as high as several billion tons, and the consumption of emulsion products shows an increasing trend. The techniques for preparing emulsions can be divided into two categories, one is the physical emulsification method, that is, the polymer is first processed to prepare nano- or micron-sized particles, and then dispersed in water or an organic solven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F220/34C08F220/14C08F220/18C08F2/34C08F2/26
CPCC08F2/26C08F2/34C08F212/08C08F220/14C08F220/18C08F220/1804C08F220/34
Inventor 刘伯军张靖仝高原陈佳宇付中禹
Owner CHANGCHUN UNIV OF TECH
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