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Preparation method of surface modified nano particles and application of product thereof

A technology of surface modification of nanometer and nanoparticle, applied in dyeing polymer organic compound treatment, fibrous filler, coating and other directions, can solve the problems of poor controllability of polymer chain segments, and achieve uniform chain length distribution and good dispersion. The effect of maintaining high transparency

Inactive Publication Date: 2011-09-14
WUJIANG YOUXIN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the controllability of the grafted polymer chain segment by reverse atom transfer radical polymerization is poor.

Method used

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  • Preparation method of surface modified nano particles and application of product thereof
  • Preparation method of surface modified nano particles and application of product thereof
  • Preparation method of surface modified nano particles and application of product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The first step is to anchor the ATRP surface initiator: add 20 grams of silica with a particle size of 50±5 nanometers to a mixed solvent containing 200ml toluene / 20ml isopropanol. In the mixed solvent, toluene and isopropanol The volume ratio is generally not more than 20:1. Stir at room temperature, add 5g of 2-bromoisobutyryl and 1.4g of triethylamine. Stir slowly at room temperature for 18 hours, filter off the solvent, wash the filter cake repeatedly with isopropanol, and dry the filter cake in a vacuum drying oven at room temperature to constant weight. Using X-ray photoelectron surface energy spectroscopy analysis, the surface of the nanoparticles has an absorption peak of bromine at 73 eV, indicating that the ATRP surface initiator has been grafted on the surface of silica.

[0038] The second step of graft polymerization: Disperse 10g of silica with ATRP surface initiator on the surface in 200ml of isopropanol, bubbling with nitrogen for 30min, adding 23mg of copp...

Embodiment 2

[0040] In the first step, 50 grams of magnesium difluoride with a particle size of 100±5 nanometers was added to a mixed solvent of 400ml toluene / 20ml isopropanol, stirred at room temperature, and 12.5g of silicodecane trichloride was added. 2-bromoisobutyryl and 4.5 g triethylamine. Stir slowly at room temperature for 18 hours, filter off the solvent, wash the filter cake repeatedly with isopropanol, and dry the filter cake in a vacuum drying oven at room temperature to constant weight. Using X-ray photoelectron surface energy spectroscopy analysis, the surface of the nanoparticles has an absorption peak of bromine at 73 eV, indicating that the ATRP surface initiator has been grafted on the surface of magnesium difluoride.

[0041] In the second step, 20g of silica with ATRP surface initiator on the surface was dispersed in 200ml of isopropanol, and nitrogen gas was introduced for 30 minutes, 46mg of copper monobromide, 100mg of pentamethyldiethylenetriamine (PMDETA) and 10g Ox...

Embodiment 3

[0043] The first step is to add 20 grams of titanium dioxide with a particle size of 25±5 nanometers to a mixed solvent of 200ml toluene / 10ml isopropanol, stir at room temperature, and add 5.5g of 2-bromosilyl trichloride Isobutyryl and 1.54g triethylamine. Stir slowly at room temperature for 18 hours, filter off the solvent, wash the filter cake repeatedly with isopropanol, and dry the filter cake in a vacuum drying oven at room temperature to constant weight. Using X-ray photoelectron surface energy spectroscopy analysis, the surface of the nanoparticles has an absorption peak of bromine at 73 eV, indicating that the ATRP surface initiator has been grafted on the surface of titanium dioxide.

[0044] In the second step, 10g of titanium dioxide with ATRP surface initiator on the surface was dispersed in 200ml of isopropanol, and nitrogen was blown for 30 minutes, and 23mg of copper monobromide, 50mg of bipyridine (bpy) and 1.2g of oxygen-free methacrylic acid were added. Hydrox...

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Abstract

The invention discloses a preparation method of surface modified nano particles and application of a product thereof. The method comprises the following steps of: reacting the surfaces of nano particles, atom transfer radical polymerization (ATRP) surface initiator and 2-bromoisobutyryl with silicon chlorine bond to anchor the ATRP surface initiator on the surfaces of the nano particles, and then performing ATRP with methacrylate monomer, catalyst, coordination agent and the like to prepare acrylate polymer modified inorganic nano particles. Therefore, the ATRP method for modifying the nano particles has controllability on the nano particle surface grafted acrylate polymer, the advantages of the nano particles are fully exerted, and the effects of enhancing and toughening the nano particles and the like are achieved under the condition of low adding amount; meanwhile, the chain length distribution of the acrylate polymer is uniform, so the dispersibility and the stability of the modified nano particles in an acrylate coating are improved; and the abrasion resistance of the coating is improved, and high transparency of the coating is kept at the same time.

Description

Technical field [0001] The invention relates to a new method for surface modification of nano particles and the application of its products, in particular to a method for controlling the surface modification of nano particles by atom transfer radical polymerization, belonging to nano surface modification technology At the same time, the application of the aforementioned surface-modified nanoparticles to acrylic coatings belongs to the field of coating preparation. Background technique [0002] Nanoparticles refer to particles with a diameter between a few to a few hundred nanometers (nanoparticles are also called ultrafine particles), which belong to the category of colloidal particle size. Nanoparticles themselves have quantum size effect, small size effect, surface effect and macro quantum tunneling effect, so they exhibit many unique properties, and have broad applications in catalysis, light filtering, light absorption, medicine, magnetic media and new materials. prospect. ...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C1/28C09C1/36C09C3/10C08F292/00C09D133/04C09D7/12
Inventor 陈敏朱锡罡
Owner WUJIANG YOUXIN NEW MATERIAL TECH
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