Method for preparing nano magnetic polymer composite microspheres

A composite microsphere and nanomagnetic technology, which is used in magnetic objects, magnetic materials, electrical components, etc.

Active Publication Date: 2010-06-16
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot fundamentally avoid the formation of uncoated magnetic particles and magnetic polymer-free microspheres

Method used

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  • Method for preparing nano magnetic polymer composite microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1) Hydrophilic ultrafine Fe 3 o 4 Preparation of particle dispersion

[0045] Preparation of Fe by Chemical Co-precipitation 3 o 4 The components and parts contained in the particles are:

[0046] FeCl 3 ·6H 2 O 54.04g

[0047] FeCl 2 4H 2 O 19.88g

[0048] Deionized water 1200ml

[0049] Oleic acid 20g

[0050] 25% ammonia water 150ml

[0051] The preparation process is: FeCl 3 ·6H 2 O, FeCl 2 4H 2 Dissolve O in 600ml of deionized water, and add to 2L reactor after dissolving; nitrogen gas is passed under stirring condition, and oleic acid is added; after stirring for 5-10 minutes, 25% ammonia water is added dropwise at room temperature; keep at room temperature for 1 hour, and heat up to 90°C , keep stirring at 90°C for 1 hour; cool down and discharge.

[0052] 2) For the Fe obtained in 1) 3 o 4 Acidification treatment of particle dispersion to prepare hydrophobic ultrafine Fe 3 o 4 Particles, which contain components and parts are:

[0053] Hydr...

Embodiment 2

[0067] 1) Hydrophilic ultrafine Fe 3 o 4 Preparation of particle dispersion

[0068] Preparation of Fe by Chemical Co-precipitation 3 o 4 The components and parts contained in the particles are:

[0069] FeCl 3 ·6H 2 O 54.04g

[0070] FeCl 2 4H 2 O 19.88g

[0071] Deionized water 1200ml

[0072] Oleic acid 20g

[0073] 25% ammonia water 150ml

[0074] The preparation process is: FeCl 3 ·6H 2 O, FeCl 2 4H 2 Dissolve O in 600ml of deionized water, and add to 2L reactor after dissolving; nitrogen gas is passed under stirring condition, and oleic acid is added; after stirring for 5-10 minutes, 25% ammonia water is added dropwise at room temperature; keep at room temperature for 1 hour, and heat up to 90°C , keep stirring at 90°C for 1 hour; cool down and discharge.

[0075] 2) For the Fe obtained in 1) 3 o 4 Acidification treatment of particle dispersion to prepare hydrophobic ultrafine Fe 3 o 4 Particles, which contain components and parts are:

[0076] Hydr...

Embodiment 3

[0090] 1) Hydrophilic ultrafine Fe 3 o 4 Preparation of particle dispersion

[0091] Preparation of Fe by Chemical Co-precipitation 3 o 4 The components and parts contained in the particles are:

[0092] FeCl 3 ·6H 2 O 54.04g

[0093] FeCl 2 4H 2 O 19.88g

[0094] Deionized water 1200ml

[0095] Oleic acid 20g

[0096] 25% ammonia water 150ml

[0097] The preparation process is: FeCl 3 ·6H 2 O, FeCl 2 4H 2 Dissolve O in 600ml of deionized water, and add to 2L reactor after dissolving; nitrogen gas is passed under stirring condition, and oleic acid is added; after stirring for 5-10 minutes, 25% ammonia water is added dropwise at room temperature; keep at room temperature for 1 hour, and heat up to 90°C , keep stirring at 90°C for 1 hour; cool down and discharge.

[0098] 2) For the Fe obtained in 1) 3 o 4 Acidification treatment of particle dispersion to prepare hydrophobic ultrafine Fe 3 o 4 Particles, which contain components and parts are:

[0099] Hydrop...

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Abstract

The invention relates to a method for preparing nano magnetic polymer composite microspheres, comprising the following steps: preparing hydrophobic ultrafine Fe3O4 particle dispersion in a chemical coprecipitation method; preparing hydrophobic ultrafine Fe3O4 particles in an acidifying way; dissolving the hydrophobic ultrafine Fe3O4 particles, initiator and super hydrophobic agent in a monomer; adding an ionic comonomer to deionized water to prepare a water phase; mixing an oil phase with the water phase; ultrasonically emulsifying the mixture of the oil phase and the water phase in the water bath to obtain emulsifier-free miniemulsion; and adding the emulsifier-free miniemulsion to a reactor so as to be polymerized for 12-24h at 50-90 DEG C to obtain the nano magnetic polymer composite microspheres. The monomer is hydrophobic monomer, the initiator is oil-soluble initiator, the super hydrophobic agent is hexadecane and the ionic comonomer is sodium p-styrene sulfonate or 2-acrylamide-2-methyl propane sulfonic acid. The nano magnetic polymer composite microspheres have the self-stabilizing superparamagnetism and the uniform magnetic content distribution.

Description

Technical field: [0001] The invention relates to a preparation method of nano magnetic polymer composite microspheres. Background technique: [0002] Magnetic polymer composite microspheres (magnetic composite microspheres) have strong magnetic responsiveness to external magnetic fields, and can be further functionalized and surface-modified to immobilize various biomolecules, so they are widely used in biomedicine, bioengineering and biological Technology and other fields have a wide range of applications, such as cell isolation, immunoassay, nucleic acid purification and DNA isolation, enzyme immobilization, magnetic resonance imaging, etc. [0003] Magnetic composite microspheres should meet some requirements in order to be applied in the fields of biology and medicine. These requirements include: magnetic composite microspheres do not precipitate in the system; magnetic composite microspheres have small particle size and narrow distribution, high and uniform magnetic co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F220/14C08F220/18C08F212/14C08F220/58C08F2/44C08F2/22C08K9/02H01F1/00
Inventor 陆书来黄金霞
Owner PETROCHINA CO LTD
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