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Preparation method of polymer microspheres with granularity gradient characteristics as well as prepared polymer microspheres and application of polymer microspheres

A particle size gradient and polymer technology, which is applied in the preparation of microspheres, microcapsule preparations, etc., can solve the problems of reduced, disappear, and destroyed stabilizing effects, and achieve stable and long-lasting effects with good stability.

Active Publication Date: 2015-07-08
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, whether it is a traditional dispersion stabilizer or an amphoteric dispersion stabilizer, when the external conditions such as pH, shear, temperature, etc. change, the above-mentioned physical adsorption and mosaic effects may be destroyed, resulting in a decrease or even disappearance of the stabilization effect.

Method used

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  • Preparation method of polymer microspheres with granularity gradient characteristics as well as prepared polymer microspheres and application of polymer microspheres
  • Preparation method of polymer microspheres with granularity gradient characteristics as well as prepared polymer microspheres and application of polymer microspheres

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[0028] The preparation method of the polymer microsphere with particle size gradient characteristic of the present invention is generally prepared by reacting a monomer and a polymerizable dispersion stabilizer as raw materials in a dispersion medium.

[0029] The amount of monomer used is 20-30% of the total amount of the system, and if necessary, functional monomers are added, and the amount of monomer used is 2-25% of the dispersion stabilizer, and the dispersion medium is mixed evenly at room temperature. Afterwards, under the action of an initiator, the temperature is maintained at 70-90° C. for 3-5 hours to obtain polymer microspheres, that is, the polymer microspheres with particle size gradient characteristics. When the conversion rate reaches over 95%, the reaction is completed, and the obtained product is subjected to centrifugal washing to obtain polymer microspheres.

[0030] The dispersion stabilizer used in the present invention is a polymerizable epoxy resin dis...

Embodiment 1

[0048] Aromatic bisphenol A type epoxy resin E44 and acrylic acid in a molar ratio of 1:1.1 are fully reacted at 90°C for 2 to 2.5 hours to obtain a single epoxy modified epoxy resin with a double bond at one end, and then Add the calculated amount of polyethylene glycol 6000, and fully react for 1.0 h at 85°C to obtain a polymerizable bisphenol A type epoxy resin dispersion stabilizer.

Embodiment 2

[0050] After the aliphatic epoxy resin ethylene glycol diglycidyl ether and acrylic acid have a molar ratio of 1:1.1 at 90°C, react fully for 1.5 to 2 hours to obtain a single-epoxy group-modified epoxy resin with one end capped, and then Add the calculated amount of polyethylene glycol 2000 and fully react for 1.0 h at 80°C to obtain a polymerizable aliphatic epoxy resin dispersion stabilizer.

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Abstract

The invention discloses a preparation method of polymer microspheres with granularity gradient characteristics. The preparation method comprises the following steps: by taking monomers and a polymer dispersion stabilizer as raw materials, performing reaction in a dispersion medium to prepare the polymer microspheres, wherein the dispersion stabilizer is a polymerizable epoxy resin dispersion stabilizer, and the polymerizable epoxy resin dispersion stabilizer is a polymer dispersion stabilizer which is prepared by reacting three components namely an unsaturated carboxylic acid monomer, epoxy resin and polyether polyol in a molar ratio of (1.0-1.1):1:1. According to the preparation method disclosed by the invention, the polymer microspheres are prepared by using the polymerizable dispersion stabilizer with double bonds, and the particle sizes of polymer microsphere particles are in gradient distribution which is different from monodisperse or polydisperse normal distribution of polymer microspheres prepared in the prior art, and thus the application requirements in specific optical fields can be well met. The prepared polymer microspheres disclosed by the invention are good and lasting in stability and cannot be easily influenced by external environments.

Description

[0001] The invention belongs to the field of functional polymer materials, and in particular relates to a method for preparing polymer microspheres with particle size gradient dispersion characteristics, polymer microspheres prepared by the method and applications thereof. Background technique [0002] Polymer microspheres refer to polymer particles with a spherical shape and a particle size ranging from tens of nanometers to hundreds of microns. Polymer microspheres have multiple characteristics: their small particle size and volume make polymer microspheres have the characteristics of fast response and high reaction rate to external stimuli when they are used as microreactors; polymer microspheres have a large specific surface area and can be used as adsorption , desorption, chemical reaction, etc., have the characteristics of strong adsorption capacity; polymer microspheres have high permeability and mobility in the medium due to gravity, electric field and Brownian motion; ...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F220/14B01J13/14B01J13/20
Inventor 黄鹤王越刘琼
Owner SUZHOU UNIV
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