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Method for preparing polyacrylate Pickering emulsion

A technology of polyacrylate emulsion and polyacrylate, applied in the field of emulsion preparation, can solve the problems of surfactant toxicity, decrease in stability and mechanical properties, poor water resistance of film, etc., and achieve the effect of good stability

Active Publication Date: 2018-06-08
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional polyacrylate emulsion preparation process uses emulsifiers to stabilize monomers and form emulsions. However, polyacrylate emulsions prepared with emulsifiers have some defects: (1) Surfactants only play a stabilizing role and do not Participating in the polymerization reaction, small molecule surfactants are easy to migrate during the film forming process, often resulting in poor water resistance of the film
(2) The stability of the obtained emulsion is not ideal, and it is easily affected by factors such as temperature, pH value, oil phase composition, etc., resulting in emulsion breaking
(3) Some surfactants also have certain toxicity, which is harmful to the human body and the environment
However, the nanoparticles used are all solid particles, and the polyacrylate emulsion obtained by stabilizing the solid nanoparticles avoids the use of surfactants, but its stability and mechanical properties are reduced.

Method used

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  • Method for preparing polyacrylate Pickering emulsion
  • Method for preparing polyacrylate Pickering emulsion
  • Method for preparing polyacrylate Pickering emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Hollow SiO 2 Modification of Nanoparticles

[0029] 30nm hollow SiO 2 Add nanoparticles into 80mL of absolute ethanol, disperse evenly by ultrasonication at 40W for 20min, heat up to 55°C, add hydrophobic modifier, keep warm for 2h, wash and dry to obtain modified hollow SiO 2 Nanoparticles;

[0030] Among them, the hollow SiO 2 The mass ratio of the nanoparticles to the hydrophobic modifier is 1.5g:0.06g, and the hydrophobic modifier is hexamethyldisilazane.

[0031] (2) Preparation of polyacrylate Pickering emulsion

[0032] ammonium persulfate and modified hollow SiO 2 The nanoparticles are added into water, and then methyl methacrylate, butyl acrylate and acrylic acid are added, the temperature is raised to 50° C., and the reaction is kept for 0.5 h to prepare the seeds of the polyacrylate emulsion. Among them, methyl methacrylate, butyl acrylate, acrylic acid, modified hollow SiO 2 The mass ratio of nanoparticles, ammonium persulfate and water is 0.529g:...

Embodiment 2

[0037] (1) Hollow SiO 2 Modification of Nanoparticles

[0038] 50nm hollow SiO 2 Nanoparticles were added to 80mL of absolute ethanol, dispersed evenly by ultrasonication at 60W for 15min, heated to 60°C, added hexamethyldisilazane, kept for 4h, washed and dried to obtain modified hollow SiO 2 nanoparticles; among them, hollow SiO2 The mass ratio of nanoparticles to hexamethyldisilazane is 1.7g:0.08g.

[0039] (2) Preparation of polyacrylate Pickering emulsion

[0040] ammonium persulfate and modified hollow SiO 2 The nanoparticles are added into water, and then methyl methacrylate, butyl acrylate and acrylic acid are added, the temperature is raised to 55° C., and the reaction is kept for 0.5 h to prepare the seeds of the polyacrylate emulsion. Among them, methyl methacrylate, butyl acrylate, acrylic acid, modified hollow SiO 2 The mass ratio of nanoparticles, ammonium persulfate and water is 0.529g: 1.462g: 0.060g: 0.041g: 0.065g: 30g;

[0041] Then the temperature was...

Embodiment 3

[0045] (1) Hollow SiO 2 Modification of Nanoparticles

[0046] 100nm hollow SiO 2 Nanoparticles were added to 90mL of absolute ethanol, sonicated at 80W for 10min to disperse uniformly, heated to 65°C, added trimethylchlorosilane, kept for 5h, washed and dried to obtain modified hollow SiO 2 nanoparticles; among them, hollow SiO 2 The mass ratio of nanoparticles to trimethylchlorosilane is 2.0g:0.10g.

[0047] (2) Preparation of polyacrylate Pickering emulsion

[0048] ammonium persulfate and modified hollow SiO 2 The nanoparticles were added into water, and then methyl methacrylate, butyl acrylate and acrylic acid were added, the temperature was raised to 60° C., and the reaction was kept for 40 minutes to prepare the seeds of the polyacrylate emulsion. Among them, methyl methacrylate, butyl acrylate, acrylic acid, modified hollow SiO 2 The mass ratio of nanoparticles, ammonium persulfate and water is 0.521g: 1.444g: 0.059g: 0.051g: 0.064g: 30g;

[0049] Then the tempe...

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Abstract

Provided is a method for preparing polyacrylate Pickering emulsion. The method comprises the steps of: adding ammonium persulfate and modified hollow SiO2 nanoparticles into water, then adding methylmethacrylate, butyl acrylate and acrylic acid, raising the temperature to 50-70 DEG C, maintaining the temperature for a reaction for 0.5-1.0 h, raising the temperature to 70-80 DEG C, adding a mixedsolution of core-layer mixed monomer, the modified hollow SiO2 nanoparticles and ammonium persulfate which is dissolved in water dropwise, maintaining the temperature for a reaction for 1-3 hours after adding is completed dropwise, raising the temperature to 80-85 DEG C, adding the mixed solution of the core-layer mixed monomer, modified hollow SiO2 nanoparticles and ammonium persulfate which is dissolved in water dropwise, and maintaining the temperature for a reaction for 1-3 hours after adding is completed dropwise so as to obtain the polyacrylate Pickering emulsion. A membrane which is obtained by using the hollow SiO2 nanoparticle-stabilized polyacrylate emulsion still has good mechanical properties and water resistance under the condition of basically unchanged hygienic performance.

Description

technical field [0001] The invention belongs to the technical field of emulsion preparation, and in particular relates to a preparation method of polyacrylate Pickering emulsion. Background technique [0002] Polyacrylate is the earliest and most widely used film-forming material in coating materials. It has excellent film-forming properties, extensibility and good adhesion, and is cheap, so it plays a huge role in coating materials. The traditional polyacrylate emulsion preparation process uses emulsifiers to stabilize monomers and form emulsions. However, polyacrylate emulsions prepared with emulsifiers have some defects: (1) Surfactants only play a stabilizing role and do not Participating in the polymerization reaction, small molecule surfactants are easy to migrate during the film formation process, often resulting in poor water resistance of the film. (2) The obtained emulsion has unsatisfactory stability and is easily affected by factors such as temperature, pH value...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/18C08F220/14C08F220/06C08F2/44C08K9/06C08K7/26
CPCC08F2/44C08F220/18C08F220/1804C08K7/26C08K9/06C08F220/14C08F220/06
Inventor 鲍艳张元霞刘盼马建中张文博刘超
Owner SHAANXI UNIV OF SCI & TECH
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