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Composite polyolefin/sio2 nano particle and its prepn

A technology of olefin polymers and nanoparticles, which is applied in the field of olefin polymer/SiO2 composite nanoparticles and its preparation, can solve the problems that the coating layer is easy to fall off, the total reaction yield is high, and the grafting efficiency is low. The effect of low grafting efficiency, low grafting rate and simple operation

Inactive Publication Date: 2003-05-14
TSINGHUA UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can not only solve the problem that the coating layer that exists in the use of simple coated nanoparticles in the past is easy to fall off, but also solve the problems of low grafting rate and low grafting efficiency in the preparation of grafted nanoparticles. The operation in the preparation is simple, and it is easy to realize industrial production; the particle size of the composite nanoparticles provided is small and uniform, the total reaction yield is high, and the grafting rate can range from tens to thousands of percent according to monomer and SiO 2 Scale adjustment

Method used

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  • Composite polyolefin/sio2 nano particle and its prepn
  • Composite polyolefin/sio2 nano particle and its prepn
  • Composite polyolefin/sio2 nano particle and its prepn

Examples

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example 1

[0049] Example 1: The average particle size of Zhoushan Mingri Company is 10 ± 5nm, and the specific surface area is 640m 2 / g nano-SiO 2 After treating with 5% KH-570 silane-type coupling agent produced by Nanjing Shuguang Chemical Factory, weigh 0.5 g and add it to 15 ml of styrene monomer, and stir evenly. Add 60ml deionized water, 0.75g sodium dodecylsulfonate and 0.1g nonylphenol polyoxyethylene ether (10) in the four-neck flask equipped with mechanical stirring, reflux condenser, nitrogen protection and thermometer, and heat up to 40°C and stirring to dissolve, add monomer and SiO 2 mixture. Then, add an aqueous initiator solution made of 0.068g ammonium persulfate and 10ml deionized water, raise the temperature to 80°C for 1.5hr, then raise the temperature to 90°C, continue the reaction for 0.5hr, then cool and discharge. Part of the emulsion after discharge was demulsified, washed, and dried to obtain a white powder product, and the other part of the emulsion was pl...

example 2

[0050] Example 2: The preparation method is the same as Example 1, with SiO 2 The amount of addition increased from 0.5g to 1.0g. The results obtained are shown in Table 1.

example 3

[0051] Example 3: the preparation method is the same as Example 1, with SiO 2 The amount of addition increased from 0.5g to 2.0g. The results obtained are shown in Table 1.

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Abstract

The present invention belongs to the field of polymer material technology. Inorganic nano Sio2 partticle, organic olefin monomer and coupler as raw materials are subjected to emulsion polymerization or suspension polymerization in water as medium in the presence of various emulsifiers and initiator, so that the olefine polymer is grafted to the surface of inorganic nano SiO2 particle to form inorganic nano SiO2 particle core-organic olefin polymer shell structure. The composite particle is spherical, has homogeneous particle size smaller than 100 nm, and has high grafting rate and high grafting efficiency. The prepared compoisite olefin polymer / SiO2 particle material has wide application in the development of nano technology.

Description

technical field [0001] The present invention relates to olefin polymers / SiO 2 Composite nanoparticles and a preparation method thereof belong to the technical field of polymer materials. Background technique [0002] There are currently two main methods for preparing polymer / inorganic composite nanoparticles, namely coating method and grafting method. Among them, the coating method is to select the prepared polymer through physical effects such as solvation, or to select certain monomers through chemical reactions such as polymerization to form a polymer coating layer on the surface of inorganic nanoparticles, but this method Because there is no chemical bond between the polymer layer and the surface of the inorganic particles, it is easy to fall off under the action of the solvent or the shearing action of the mechanical force. The polymer or monomer reacted by the functional group on the surface of the particle is grafted on the surface of the inorganic nanoparticle to f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/16C08F2/44C08K3/36C08L23/00
Inventor 于建刘文芳郭朝霞
Owner TSINGHUA UNIV
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