Method for preparing polyacrylate Pickering emulsion

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...

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.

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