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Preparing method of composite styrene-acrylic emulsion containing silicon dioxide

A technology of silicon dioxide and styrene-acrylic emulsion, applied in instruments, inks, coatings, etc., can solve the problems of affecting the stability of styrene-acrylic emulsion, affecting the comprehensive performance of emulsion, and producing residues due to directional coagulation of latex beams.

Active Publication Date: 2013-04-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, whether the direct addition of nano-SiO 2 particles, or nano-SiO prepared by sol-gel method 2 The particles will affect the stability of the styrene-acrylic emulsion, causing the directional coagulation of latex bundles and residues during emulsion polymerization, which will affect the overall performance of the emulsion

Method used

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  • Preparing method of composite styrene-acrylic emulsion containing silicon dioxide
  • Preparing method of composite styrene-acrylic emulsion containing silicon dioxide
  • Preparing method of composite styrene-acrylic emulsion containing silicon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 20ml of deionized water and 5ml of ethanol into a 250ml four-necked flask equipped with a condenser tube, a mechanical stirrer, and 2 constant-pressure dropping funnels, and adjust the pH value to 8.0-9.5 with ammonia water to obtain an alcoholic solution. Mix the mixed monomer containing 0.8 gram of styrene, 0.2 gram of butyl acrylate, 0.08 gram of acrylic acid and 4.50 gram of ethyl orthosilicate, and ultrasonically disperse for 30 minutes to obtain a mixed solution of ethyl orthosilicate; The mixed solution was added to the above alcohol solution at one time, stirred under the protection of nitrogen, and reacted at room temperature for 5 hours to obtain a silica / mixed monomer dispersion.

[0032] Add 0.25 g of vinyltrimethoxysilane coupling agent dropwise to the silica / mixed monomer dispersion and continue to react at room temperature for 3 hours under nitrogen protection to obtain a silane-modified silica / mixed monomer dispersion.

[0033] Add 45ml of deionized ...

Embodiment 2

[0037] Add 20ml of deionized water and 5ml of ethanol into a 250ml four-necked flask equipped with a condenser tube, a mechanical stirrer, and 2 constant-pressure dropping funnels, and adjust the pH value to 8.0-9.5 with ammonia water to obtain an alcoholic solution. Mix the mixed monomer containing 0.8 g of styrene, 0.2 g of β-hydroxyethyl acrylate, 0.08 g of acrylic acid and 4.50 g of ethyl orthosilicate, and ultrasonically disperse for 30 minutes to obtain a mixed solution of ethyl orthosilicate; The ethyl ester mixed solution was added to the above alcohol solution at one time, stirred under the protection of nitrogen, and reacted at room temperature for 8 hours to obtain a silica / mixed monomer dispersion.

[0038] Add 0.25 g of vinyltriethoxysilane coupling agent dropwise to the silica / mixed monomer dispersion and continue to react at room temperature under nitrogen protection for 4 hours to prepare a silane-modified silica / mixed monomer dispersion.

[0039] Add 45ml of d...

Embodiment 3

[0043] Add 20ml of deionized water and 5ml of ethanol into a 250ml four-necked flask equipped with a condenser tube, a mechanical stirrer, and 2 constant-pressure dropping funnels, and adjust the pH value to 8.0-9.5 with ammonia water to obtain an alcoholic solution. Mix the mixed monomers containing 3.2 g of styrene, 0.96 g of β-hydroxypropyl acrylate, 0.16 g of acrylamide and 16.6 g of ethyl orthosilicate, and disperse ultrasonically for 30 minutes to obtain a mixed solution of ethyl orthosilicate; The ethyl acetate mixed solution was added to the above alcohol solution at one time, stirred under the protection of nitrogen, and reacted at room temperature for 10 hours to obtain a silica / mixed monomer dispersion.

[0044] Add 0.03 g of vinyl tris(β-methoxyethoxy)silane coupling agent dropwise to the silica / mixed monomer dispersion and continue to react at room temperature under nitrogen protection for 0.5 hours to obtain silane-modified silica / Mix the monomer dispersion.

...

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Abstract

The invention aims at the shortcomings that inorganic nanometer particles are easy to conglomerate and poor in compatibility with a polymer, a polymer emulsion is unstable, and directional conglomerating of emulsion bundles is easy to appear and residues are easy to generate during the polymerization process in a traditional inorganic or organic composite emulsion, and provides a preparing method of a composite styrene-acrylic emulsion containing silicon dioxide. The preparing method includes: using an in situ sol-gel method to produce nanometer silicon dioxide particles which are uniformly dispersed in monomer, and controllable in particle morphology and particle diameters; then preparing a seed emulsion containing the silicon dioxide particles after obtaining a styrene-acrylic pre-emulsion by using mixed type emulsifiers; and finally preparing the composite styrene-acrylic emulsion by adopting a seed emulsion polymerization method. By adopting the preparing method, the styrene-acrylic emulsion of which silicon dioxide is high in filling volume, and uniformly and stable dispersed in the emulsion is obtained.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a method for preparing a silicon dioxide-containing styrene-acrylic emulsion used in coatings, printing inks, and toners for printing and copying. Background technique [0002] Styrene-acrylic emulsion has been widely used in coatings and adhesives because of its non-toxicity, good weather resistance, stain resistance and low production cost. However, the styrene-acrylic latex film has disadvantages such as low hardness, scrub resistance, solvent resistance and heat resistance, which limit its application. Silicon dioxide (SiO 2 ) is a non-toxic, odorless, non-polluting, chemically stable, acid and alkali resistant inorganic filler, commonly used in rubber and plastic products as reinforcing agents, fillers, lubricants, anti-settling agents for coatings, and inks anti-dripping agent, etc. Using SiO 2 , especially nanoscale SiO 2 Modification can improve the strength and ...

Claims

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Application Information

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IPC IPC(8): C08F212/08C08F220/18C08F220/28C08F220/14C08F220/06C08F220/56C08F222/16C08F222/02C08F2/44C08F2/30C08F2/26C08K9/06C08K3/36C09D125/14C09D7/12C09D11/10G03G9/08C09D11/107
Inventor 解孝林孙燕华周兴平廖永贵薛志刚
Owner HUAZHONG UNIV OF SCI & TECH
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