Unmodified silica sol/polystyrene-acrylate nano core-shell emulsion and preparation method thereof

An acrylate and polystyrene technology, applied in the field of environmentally friendly nano-core-shell water-based emulsions, can solve the problems of poor performance improvement of emulsions, inability to uniformly disperse nanoparticles, and poor storage stability of blended emulsions, and achieve artificial resistance Excellent aging resistance, rapid synthesis, good stain resistance effect

Active Publication Date: 2016-12-07
广西亚多漆业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple in process, but SiO 2 The particles cannot form an effective interaction with the polymer latex particles, the storage stability of the blended emulsion is poor, and the improvement effect on the emulsion performance is not good, mainly because the nanoparticles are not uniformly dispersed in the styrene-acrylic emulsion matrix

Method used

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  • Unmodified silica sol/polystyrene-acrylate nano core-shell emulsion and preparation method thereof
  • Unmodified silica sol/polystyrene-acrylate nano core-shell emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Seed emulsion polymerization: the four-necked flask equipped with agitator, reflux condenser, thermometer and titration funnel is placed in a constant temperature water bath, stirred at a constant speed of 400r / min, under N 2 Under protection, in parts by weight, add 100g deionized water, 3g reactive emulsifier allyloxy nonylphenoxy propanol polyoxyethylene ether, add 150g of commercially available alkaline silica sol (with In terms of silicon dioxide, the weight content of silicon is 30%, the average particle diameter is 10nm, and the pH value is 9), and the dispersion is uniform; gradually warming up to 75°C, and keeping a constant temperature, add 0.20g ammonium persulfate (dissolved in 10g distilled water to prepare Add as a solution), start titration of 8g styrene-acrylic acid ester mixed monomer (styrene / n-butyl acrylate / methyl methacrylate / acrylic acid=47 / 49 / 3 / 1, mass ratio), and drop it in 10 minutes , and keep warm for 1 hour to obtain seed emulsion;

[0026]...

Embodiment 2

[0029] Seed emulsion polymerization: the four-necked flask equipped with agitator, reflux condenser, thermometer and titration funnel is placed in a constant temperature water bath, stirred at a constant speed of 300r / min, under N 2 Under protection, in parts by weight, add 140g deionized water, 5g reactive emulsifier allyloxy hydroxypropyl sodium sulfonate, add 300g of commercially available alkaline silica sol (calculated as silicon dioxide, The weight content of silicon is 50%, and average particle diameter is 30nm, and pH value is 10), uniformly dispersed; Be warming up to 75 ℃ gradually, and keep constant temperature, add 0.50g ammonium persulfate (dissolve in 10g distilled water and make solution and add), Start titration of 20g of styrene-acrylic acid ester mixed monomer (styrene / n-butyl acrylate / ethyl methacrylate / methacrylic acid=46 / 47 / 4 / 3, mass ratio), drop it in 20 minutes, and keep warm 1 hour, obtain seed emulsion;

[0030] shell monomer polymerization: add 6g no...

Embodiment 3

[0032] Seed emulsion polymerization: the four-necked flask equipped with agitator, reflux condenser, thermometer and titration funnel is placed in a constant temperature water bath, stirred at a constant speed of 300r / min, under N 2 Under protection, in parts by weight, add 120g deionized water, 4g reactive emulsifier allyloxy fatty alcohol oxyethylene ether ammonium sulfate, add 250g of commercially available alkaline silica sol (calculated as silicon dioxide) after 10 minutes , the weight content of silicon is 40%, and average particle diameter is 20nm, and pH value is 9), uniform dispersion; Gradually warming up to 75 ℃, and keep constant temperature, add 0.30g ammonium persulfate (dissolve in 10g distilled water and make solution add) , start to titrate 15g of styrene-acrylate mixed monomer (styrene / n-butyl acrylate / acrylic acid=48 / 48 / 4, mass ratio), drop it in 20 minutes, and keep it warm for 1 hour to obtain the seed emulsion;

[0033] Polymerization of shell monomers: A...

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Abstract

The invention discloses an unmodified silica sol / polystyrene-acrylate nano core-shell emulsion and a preparation method thereof. Using commercially available alkaline silica sol, styrene, and acrylic ester monomers as the main raw materials, there is no need for tedious surface modification of nanoparticles. Under the action of reactive emulsifiers, the seed monomers will 2 Surface in-situ polymerization, followed by shell monomer polymerization to form high silica sol / polystyrene-acrylate nano-core-shell polymer emulsion, which has small particle size, high silicon content, high coating rate, stability, etc. Various properties. The method has simple production process and rapid synthesis, and the obtained composite latex has an obvious nano-core-shell composite structure, with nano-silica as the core and styrene-acrylic polyester as the shell; it has good water resistance, stain resistance, and heat resistance. Non-toxic, acid and alkali resistance and other properties, and environmental protection, flame retardant, good transparency. It can be widely used in various coating fields such as high-grade architectural coatings, electronic packaging materials, ship anti-corrosion coatings, etc.

Description

technical field [0001] The invention belongs to the field of environment-friendly nano-core-shell aqueous emulsion, and in particular relates to an unmodified silica sol / polystyrene-acrylate nano-core-shell emulsion and a preparation method thereof. Background technique [0002] There have been many studies on the modification of nanomaterials and the preparation of styrene-acrylic emulsions, but there are still few effective methods for modifying styrene-acrylic emulsions with nanomaterials. In the early days, complex emulsions were prepared by physical blending, and coatings were prepared as film-forming base materials, such as: "Nano interior wall coatings" (application number 200810147407.1 publication date 2009-01-07), "A nano-silica sol modified exterior Wall paint and its preparation method" (application number 201310331019.X publication date 2013-10-23), "an antifouling imitation porcelain four-in-one coating" (application number 201310460051.8 publication date 2014-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/18C08F212/08C08F220/14C08F220/06C08F2/30C08F2/26C08F2/44C08K3/36
Inventor 庞起章浩苏景富巫朝剑窦玉忠覃爱苗张利芳
Owner 广西亚多漆业有限责任公司
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