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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 of the composite emulsion, which cannot explain the relationship between the inorganic phase and the organic phase in the organic / inorganic composite material
Chinese patent CN 1246346C discloses a preparation method of carboxyl functional polymer / nano-silica composite nanoparticles, which uses a soap-free suspoemulsion polymerization method, but the reactive The high cost of type emulsifier limits its wide application

Method used

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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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Effect test

Embodiment 1

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

[0028] B. Add 10g of the silica dispersion in step A to the reactor equipped with a condensing device, then add 60g of deionized water, stir evenly, add 0.09g of sodium dodecylbenzenesulfonate and polyalkylphenol Composite emulsifier composed of oxyethylene ether and 0.3g acrylate monomer, heated to 78°C and stirred at a speed of 270rpm to disperse evenly, then slowly...

Embodiment 2

[0030] A. Add 850ml of ethanol, 30ml of deionized water, and 75ml of ammonia water into a reactor equipped with a condensing device and heat it to 50°C. After stirring evenly, add 45ml of tetraethyl orthosilicate, let it react for 22 hours, continue stirring and adjust the temperature to 30°C, then add 40ml of vinyltriethoxysilane to the system, keep stirring at the temperature for 13 hours, after the reaction, separate the modified nano-silica particles, wash them with ethanol four times, and then disperse them in deionized water. A nano-silica dispersion with a mass concentration of 2.3% was obtained.

[0031] B. Add 20g of the silica dispersion in step A to the reactor equipped with a condensing device, then add 55g of deionized water, stir evenly, add 0.09g of sodium dodecylsulfonate and octylphenyl poly Composite emulsifier composed of oxyethylene ether and 0.4g acrylate monomer, heated to 80°C and stirred at a speed of 300rpm to disperse evenly, then slowly add 9.6g acry...

Embodiment 3

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

[0034]B. Add 26g of the silica dispersion in step A to the reactor equipped with a condensing device, then add 54g of deionized water, and after stirring evenly, add 0.09g of sodium dodecylbenzenesulfonate and octylphenyl Composite emulsifier composed of polyoxyethylene et...

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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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