Core-shell structured nano-silica/polyacrylate emulsion and its preparation method

A technology of nano-silica and polyacrylate emulsion, which is applied in the preparation field of water-based core-shell structure nano-silica/polyacrylate composite emulsion, can solve the problem of high cost of reactive emulsifier, limitation of wide application, and inability to explain The relationship between the inorganic phase and the organic phase, etc., to achieve the effects of low equipment cost, obvious core-shell structure, and stable properties

Inactive Publication Date: 2012-11-07
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
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Problems solved by technology

For example, Chinese patent CN 1654533A discloses a nano-silica/acrylate composite emulsion and its preparation method. The preparation method is to first treat the nano-silica particles with a coupling agent on the surface, and then prepare them by in-situ polymerization. , the amount of nanoparticles accounts for 0.1-5% of the amount of acrylate monomer in this method, but it performs microscopic characterization o

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  • Core-shell structured nano-silica/polyacrylate emulsion and its preparation method
  • Core-shell structured nano-silica/polyacrylate emulsion and its preparation method
  • Core-shell structured nano-silica/polyacrylate emulsion and its preparation method

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[0026] Example 1

[0027] A. Add 820ml ethanol, 30ml deionized water and 70ml ammonia water into a reactor equipped with a condenser and heat it to 50℃. After stirring evenly, add 40ml ethyl orthosilicate and let it react for 24 hours, then continue to stir and adjust the temperature After reaching 35°C, add 32ml of vinyltrimethoxysilane to the system, keep the stirring temperature for 12 hours, after the reaction, separate the modified nano-silica particles, wash with ethanol four times and then disperse in deionized water to obtain A nano-silica dispersion with a mass concentration of 2.5%.

[0028] B. Add 10g of silica dispersion in step A to a reactor equipped with a condensation device, and then add 60g of deionized water, and after stirring, add 0.09g of sodium dodecylbenzene sulfonate and alkylphenol poly A composite emulsifier composed of oxyethylene ether and 0.3g acrylate monomer, heated to 78°C and stirred at 270rpm for uniform dispersion, slowly add 9.7g acrylate monom...

Example Embodiment

[0029] Example 2

[0030] A. Add 850ml of ethanol, 30ml of deionized water, and 75ml of ammonia into a reactor equipped with a condensing device and heat to 50°C. After stirring evenly, add 45ml of ethyl orthosilicate to react for 22 hours, then continue to stir and adjust the temperature After reaching 30°C, add 40ml of vinyl triethoxysilane to the system and keep stirring temperature for 13 hours. After the reaction, the modified nano-silica particles are separated, washed with ethanol four times and then dispersed in deionized water. A nano-silica dispersion with a mass concentration of 2.3% is obtained.

[0031] B. Add 20g of silica dispersion in step A to a reactor equipped with a condenser, and then add 55g of deionized water, and after stirring, add 0.09g of sodium dodecyl sulfonate and octyl phenyl poly A composite emulsifier composed of oxyethylene ether and 0.4g acrylate monomer, heated to 80°C and stirred at 300rpm for uniform dispersion, slowly add 9.6g acrylate monome...

Example Embodiment

[0032] Example 3

[0033] A. Add 870ml of ethanol, 40ml of deionized water, and 77ml of ammonia into a reactor equipped with a condensing device and heat it to 50°C. After stirring, add 50ml of ethyl orthosilicate and react for 10 hours to obtain nano silica Particles; when the monodisperse nano-silica particles are prepared, continue to stir and adjust the temperature to 30°C, then add 20ml of vinyl trimethoxysilane to the system, keep the stirring temperature for 13 hours, after the reaction is complete, separate the modified The nano-silica particles were washed with ethanol four times and then dispersed in deionized water to obtain a dispersion of nano-silica with a mass concentration of 2.9%.

[0034] B. Add 26g of the silica dispersion in step A to the reactor equipped with a condenser, and then add 54g of deionized water, and after stirring uniformly, add 0.09g of sodium dodecylbenzene sulfonate and octylphenyl A composite emulsifier composed of polyoxyethylene ether and 0....

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Abstract

The invention provides a core-shell structured nano-silica/polyacrylate emulsion and simultaneously provides a method for preparing the emulsion by the adoption of an emulsion polymerisation method. The preparation method comprises the following steps of: firstly preparing monodispersed nano-silica by a sol-gel method, modifying the surface of the monodispersed nano-silica by the use of organosilicon silicyl oxide, dispersing the modified nano-silica into deionized water, using a seed emulsion with nano silica as the core structure and an acrylic acid ester mixed monomer to carry out polymerization encapsulation by an emulsion polymerisation method so as to form the core-shell structured nano-silica/polyacrylate emulsion. Micromorphology of emulsion particle is spherical and its structure is a core-shell structure, and nano-silica exists as the core structure.

Description

technical field [0001] The invention relates to a preparation technology of an inorganic / polyacrylate composite material, in particular to a preparation method of a water-based core-shell structure nano-silica / polyacrylate composite emulsion. technical background [0002] Copolymers of vinyl monomers such as acrylate and methacrylate are called acrylic resins. Generally used as a film-forming substance in coatings. Acrylic resin has been widely used in the field of coatings due to its good adhesion and film-forming properties. However, it has defects in thermal stability and poor mechanical properties. Therefore, people have made various modifications to it in order to improve its performance. Due to the excellent mechanical properties and aging resistance of inorganic nanomaterials, the mechanical and aging resistance properties of acrylic resin can be improved by combining them with resins. Therefore, the research on organic / inorganic composite materials has attracted mo...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F2/26C08F2/30
Inventor 于书平冯俊红韩克飞金鑫朱红汪中明
Owner BEIJING UNIV OF CHEM TECH
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