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A polyphenyl ether-based magnetic liquid

A polyphenyl ether and magnetic liquid technology, applied in the direction of magnetic liquid, magnetic objects, magnetic materials, etc., can solve the problems of not being able to withstand radiation, not being able to use high temperature, and high volatilization rate, and achieve uniform particle distribution, high thermal decomposition temperature, The effect of high saturation magnetization

Inactive Publication Date: 2018-11-02
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Water-based, kerosene-based, ester-based, silicone oil-based, and fluoroether oil-based magnetic fluids have reached a mature and practical stage, but with the expansion of applications of these types of magnetic fluids, the current magnetic fluids have some shortcomings, such as: cannot be used for High temperature, easy to oxidize, not resistant to radiation, relatively high volatility, etc., and polyphenylene ether has a stable chemical property and unique properties because of its benzene ring structure, which can overcome the defects of the above-mentioned special environment and has a very high use value

Method used

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  • A polyphenyl ether-based magnetic liquid
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  • A polyphenyl ether-based magnetic liquid

Examples

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Effect test

Embodiment 1

[0040] (1) Preparation of Fe 2+ and Fe 3+ Iron salt precursor solution

[0041] According to Fe 2+ : Fe 3+ The molar ratio of =1:1.75 weighs 18.92g FeCl respectively 3 ·6H 2 O, 7.95gFeCl 2 4H 2 O add 400ml deionized water to prepare Fe 2+ and Fe 3+ Move the iron salt precursor solution into a reaction vessel, control the temperature of the water bath to 25° C., and stir at a speed of 300 r / min until the iron salt is completely dissolved.

[0042] (2) Bare Fe 3 o 4 Preparation of Magnetic Nanoparticles

[0043] Using the co-precipitation method, the fundamental principle is: Fe 2+ +2Fe 3+ +8OH - =Fe 3 o 4 +4H 2 O, slowly adding 25% NH to the iron salt precursor solution 3 ·H 2 O alkali solution 60ml is used as a precipitating agent, the temperature of the water bath is controlled at 25°C, the stirring speed is reduced to 200r / min, and the precipitation reaction time is 60min, that is, bare Fe 3 o 4 magnetic nanoparticles.

[0044] (3) Preparation of anioni...

Embodiment 2

[0053] (1) Preparation of Fe 2+ and Fe 3+ Iron salt precursor solution

[0054] According to Fe 2+ : Fe 3+ The molar ratio of =1:1.75 weighs 18.92g FeCl respectively 3 ·6H 2 O, 7.95gFeCl 2 4H 2 O add 400ml deionized water to prepare Fe 2+ and Fe 3+ Move the iron salt precursor solution into a reaction vessel, control the temperature of the water bath to 25° C., and stir at a speed of 300 r / min until the iron salt is completely dissolved.

[0055] (2) Bare Fe 3 o 4 Preparation of Magnetic Nanoparticles

[0056] Using the co-precipitation method, the fundamental principle is: Fe 2+ +2Fe 3+ +8OH - =Fe 3 o 4 +4H 2 O, slowly adding 25% NH to the iron salt precursor solution 3 ·H 2 O alkali solution 60ml is used as a precipitating agent, the temperature of the water bath is controlled at 25°C, the stirring speed is reduced to 200r / min, and the precipitation reaction time is 60min, that is, bare Fe 3 o 4 magnetic nanoparticles.

[0057] (3) Preparation of anioni...

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Abstract

The invention publishes polyphenyl ether magnetic liquid. The magnetic liquid is composed of three parts: exposed Fe3O4 magnetic nano-particles, anionic surfactant and polyphenyl ether carrier liquid, wherein the anionic surfactant adopts phenoxyundecanoic acid and o-phenoxy-benzoic acid; the polyphenyl ether carrier liquid is one or mixture of several chemical substances represented by o-, m-, p- structures according to any proportion. The magnetic liquid is high in saturation magnetization strength, uniform in particle distribution, free from agglomeration and sedimentation, and high in thermal decomposition temperature, good in oxidation stability, excellent in radiation resistance, and low in vapor pressure, and can be suitable for solving the special sealing problem of aerospace, machinery, chemistry and other important equipment with strong radiation working condition under extreme special environment.

Description

technical field [0001] The invention relates to a magnetic liquid, in particular to a polyphenyl ether-based magnetic liquid. Background technique [0002] Magnetic liquid is a new type of nano-functional material. Magnetic particles coated with surfactants with a particle size of about 10nm are evenly dispersed in the base carrier liquid to form a colloidal suspension in which the two phases of solid and liquid are uniformly and stably mixed at the nanoscale. liquid, no layered precipitation occurs under the external field. Magnetic liquid is a new type of functional material that combines the fluidity of liquid and the response characteristics of solid magnetic materials to magnetic fields. It has a wide range of applications in the field of engineering, and magnetic liquid sealing is one of the many applications of magnetic liquid. [0003] Magnetic particles can be divided into: metals, including Fe, Co, Ni, Fe-Co, Fe-Ni alloys, etc.; iron nitrides, including FeN, Fe 3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/44H01F1/42
CPCH01F1/42H01F1/445
Inventor 李德才李文怡张志力柏乐
Owner BEIJING JIAOTONG UNIV