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Preparing method for olefinic polymer/silicon composite nanometer particle with high cross-linked characteristic

An olefin polymer and silicon dioxide technology, applied in the field of polymer materials, can solve the problems of increasing process complexity and production cost, high cost, cumbersome processing technology, etc., to improve the weak interface effect, solve the problem of low grafting efficiency, Overcomes the effect of easy shedding

Inactive Publication Date: 2005-02-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two ways to obtain a firm coating, one is the currently widely used grafting method, that is, the selection of polymers or monomers that can react with the surface of inorganic particles or can react with functional groups introduced on the surface of inorganic particles. Body, through functional group reaction or by polymerization reaction, etc., make it grafted on the surface of inorganic nanoparticles to form a polymer coating layer, in this method, there is a strong chemical bond connection between the polymer layer and the surface of inorganic particles, for example, A coupling agent containing unsaturated double bonds can be used to introduce polymerizable double bonds on the surface of inorganic particles, and then add monomers for copolymerization to graft polymers on the surface of inorganic particles, but this process usually requires two steps to complete. First use dry method or wet method to pretreat the surface of inorganic particles. The wet method is cumbersome, time-consuming, and costly. The dry method has poor uniformity, and no matter which method is used, the process complexity will be increased. and production costs; in addition to the grafting method, another method is to add a small amount of crosslinking agent to the polymerization system to form a layer of polymer network on the surface of the inorganic core. There are fewer reports about this method
These two methods can obtain firm coating, that is, the formed coating layer is not easy to fall off, but generally the efficiency is relatively low, that is, the obtained composite nanoparticles have a low amount of non-extractable polymer
There are no reports on the examples of the combined use of these two methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: Add 60ml deionized water, 0.068g ammonium persulfate, 0.75g sodium dodecylsulfonate and 0.1g nonylphenol in a four-necked flask equipped with mechanical stirring, reflux condenser, nitrogen protection and thermometer Polyoxyethylene (10) ether, heat up to 40°C, stir to dissolve, raise the temperature to 80°C, add 0.5g of 2 / g nano-SiO 2 The mixture of particles and 10ml styrene monomer, 0.025g γ-methacryloxypropyltrimethoxysilane (MPS), reacted for 0.5 to 1 hour, then added 0.68g trimethylolpropane trimethacrylate (TMPTMA) and 5ml styrene, after reacting for 1-2 hours, heat up to 90°C, continue to react for 0.5-1 hour, 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 placed in a test tube, and it was found that no precipitation occurred after storage for 6 months. The particle size measured by the dynamic light scattering method is 52nm, an...

Embodiment 2

[0018] Embodiment 2: Add 60ml deionized water, 0.068g ammonium persulfate, 0.75g sodium dodecylsulfonate and 0.1g nonylphenol in the four-necked flask equipped with mechanical stirring, reflux condenser, nitrogen protection and thermometer Polyoxyethylene (10) ether, heat up to 40°C, stir to dissolve, raise the temperature to 80°C, add 0.5g of 2 / g nano-SiO 2 The mixture of particles, 15ml styrene monomer and 0.025g γ-methacryloxypropyl trimethoxysilane (MPS) reacted for 0.5-1 hour, then added 0.68g TMPTMA, reacted for 1-2 hours and then raised the temperature to 90°C, continue to react for 0.5 to 1 hour, 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 placed in a test tube, and it was found that no precipitation occurred after storage for 6 months. The particle size measured by the dynamic light scattering method is 48nm, and the total reaction yield is ...

Embodiment 3

[0019] Embodiment 3: the preparation method is the same as that of embodiment 1, replacing styrene with methyl methacrylate. The results obtained are shown in Table 1.

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Abstract

Ong kind highly hand in the alkene polymer which uniter the characteristic / oxidize the silicon compounding type nanometer particle two times preparation method. This method is with the inorganic nanometer Si02 particle, the alkene is single. Unites the pharmaceutical occasionally, many functional groups hand in and unite the pharmaceutical as raw materials in the emulsifier, there is the initiator under conditions, regarded water as and dispersed the medium and tot together the cream. Among them the alkene is single, SiO2 particle, unite the pharmaceutical occasionally, hand in and unite the pharmaceutical, emulsifier, the quality percentage of initiator every component part is: Alkene is single 57.5-98.75%, SiO2 particle is 0.5-17.25%, unite 0.005-1.7% of pharmaceutical occasionally, hand in and unite 0.1-17.25% of pharmaceutical, emulsifier is 0.5-5.7%, initiator is 0.1-0.6%, this invention craft is simple, the nanometer ion prepared has highly cross-linked characteristics, and there is chemistry that is combined between the unclear shell.

Description

technical field [0001] The present invention relates to an olefin polymer / silica (SiO 2 ) A method for preparing composite nanoparticles, belonging to the field of polymer materials. Background technique [0002] The earliest people prepared polymer / inorganic composite nanoparticles, usually selected the prepared polymer through physical effects such as solvation or selected some monomers through chemical reactions such as polymerization to form polymer coatings on the surface of inorganic nanoparticles. However, because there is no chemical bond between the polymer layer and the surface of the inorganic particles in this method, it is easy to fall off under the action of solvent or the shearing action of mechanical force. There are two ways to obtain a firm coating, one is the currently widely used grafting method, that is, the selection of polymers or monomers that can react with the surface of inorganic particles or can react with functional groups introduced on the surf...

Claims

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Application Information

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IPC IPC(8): C08F2/22C08F2/44C08F10/00C08K3/36C08L23/00
Inventor 于建刘文芳郭朝霞
Owner TSINGHUA UNIV