Monodisperse composite magnetic microsphere and preparation method thereof

A composite magnetic and monodisperse technology, applied in the field of magnetic materials, can solve the problems of time-consuming, complex preparation, and low temperature of monodisperse magnetic microspheres, and achieve the effects of simple process, simple preparation and high yield

Active Publication Date: 2016-08-17
广州美基生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems existing in the prior art of monodisperse composite magnetic microspheres, to provide a kind of composite magnetic microspheres that are not easy to be oxidized, not easy to fall off, and have adjustable magnetic properties. Monodisperse melamine resin (MF) microspheres core, iron-nickel magnetic material as the middle layer, SiO 2 It is the outer layer, and it also solves the problems of low operating temperature, complicated and time-consuming preparation of monodisperse magnetic microspheres of the existing polymer matrix, and the process is simple and easy to industrialize

Method used

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  • Monodisperse composite magnetic microsphere and preparation method thereof
  • Monodisperse composite magnetic microsphere and preparation method thereof
  • Monodisperse composite magnetic microsphere and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Fe 2+ and Ni 2+ Adsorption: Disperse 6g of MF microspheres (particle size 2mm, molar ratio of melamine / formaldehyde = 1 / 3.3) in 250mL dissolved in 0.4mol / L FeCl 2 and 0.1mol / L NiCl 2 solution, ultrasonically dispersed for 10 min. Raise the temperature to 60°C and stir the reaction for 1 hour, centrifuge and wash with deionized water to obtain the adsorbed Fe 2+ and Ni 2+ MF microspheres.

[0031] (2) Fe 2+ , Fe 3+ and Ni 2+ Reduction of: the adsorbed Fe 2+ and Ni 2+ The MF microspheres were added to 78g of 40% hydrazine hydrate, ammonia water was added dropwise to adjust the pH to 10, the reaction was stirred in a water bath at 60°C for 4 hours, and iron-nickel-coated MF microspheres were obtained after magnetic separation.

[0032] (3) SiO 3 2- Adsorption: Add 250 mL of 1mol / L Na to the MF microspheres coated with iron and nickel 2 SiO 3 In the aqueous solution, stir and react in a water bath at 60°C for 1 hour. After magnetic separation, SiO is adsor...

Embodiment 2

[0036] (1) Fe 2+ and Ni 2+ Adsorption: Disperse 6g of MF microspheres (particle size 3mm, molar ratio of melamine / formaldehyde = 1 / 3.3) in 250mL dissolved in 0.45mol / L FeSO 4 and 0.05mol / L Ni(AC) 2 solution, ultrasonically dispersed for 15 minutes. Raise the temperature to 50°C and stir the reaction for 1.5h, centrifuge and wash with deionized water to obtain the adsorbed Fe 2+ and Ni 2+ MF microspheres.

[0037] (2) Fe 2+ , Fe 3+ and Ni 2+ Reduction of: the adsorbed Fe 2+ and Ni 2+ The MF microspheres were added to 78g of 40% hydrazine hydrate, ammonia water was added dropwise to adjust the pH to 12, the reaction was stirred in a water bath at 60°C for 5 hours, and iron-nickel-coated MF microspheres were obtained after magnetic separation.

[0038] (3) SiO 3 2- Adsorption: Add the above-mentioned iron-nickel-coated MF microspheres to 250mL of 1mol / L Na 2 SiO 3 In an aqueous solution, stir and react in a water bath at 80°C for 1.5 hours. After magnetic separation...

Embodiment 3

[0043] (1) Fe 2+ and Ni 2+ Adsorption: Disperse 6g of MF microspheres (particle size 4mm, molar ratio of melamine / formaldehyde = 1 / 3.3) in 250mL dissolved in 0.4mol / L FeCl 2 , 0.4mol / L FeSO 4 and 0.2mol / L NiSO 4 solution, ultrasonically dispersed for 12 minutes. Raise the temperature to 80°C and stir the reaction for 1 hour, centrifuge and wash with deionized water to obtain the adsorbed Fe 2+ and Ni 2+ MF microspheres.

[0044] (2) Fe 2+ , Fe 3+ and Ni 2+ Reduction: Fe is adsorbed to the above 2+ and Ni 2+ Add 189g of sodium borohydride to the MF microspheres, add ammonia water dropwise to adjust the pH=10, stir and react in a water bath at 60°C for 3.5h, and obtain iron-nickel-coated MF microspheres after magnetic separation.

[0045] (3) SiO 3 2- Adsorption: Add the above-mentioned iron-nickel-coated MF microspheres to 250mL1.3mol / L Na 2 SiO 3 In an aqueous solution, stir and react in a water bath at 50°C for 1.5 hours, and SiO will be adsorbed after magnetic...

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Abstract

The invention discloses a monodisperse composite magnetic microsphere and a preparation method thereof. The monodisperse composite magnetic microsphere takes a melamino-formaldehyde (MF) microsphere as a kernnel, iron and nickel coat the surface of the MF microsphere via an adsorption-reduction manner, a layer of SiO2 covers the MF microsphere coated with iron and nickel via a method of transforming silicate through acid, the magnetism of the microsphere is regulated by regulating the ratio of Fe<2+> to Ni<2+>, and consequently, the problems of high probability of oxidization, short use period, and unadjustable magnetism of a magnetic microsphere in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and in particular relates to a monodisperse composite magnetic microsphere and a preparation method thereof. Background technique [0002] The application of magnetic materials has developed from the traditional technical field to the high-tech field, and expanded from the scope of pure magnetism to the interdisciplinary field related to magnetism. Magnetic materials can be used to make various magnetic devices such as transformers, motors, speakers, magnetostrictive vibrators, magnetic recording media, various sensors, dampers, and electromagnetic absorbers. [0003] Magnetic polymer microspheres are a new type of magnetic material developed in recent years. They are composite microspheres with certain magnetic properties and special structures formed by combining magnetic inorganic particles and organic polymers by appropriate methods. Composite magnetic microspheres not only have m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02H01F1/42
CPCB01J13/02H01F1/42
Inventor 黄玉安徐钊张鼎徐晶鑫张刘全王章忠杭祖圣韩冰李友伟尚宏朝
Owner 广州美基生物科技有限公司
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