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High property magnetic rheological fluid using carbon nono tube as anti-sedimentation agent and its preparation method

A magnetorheological fluid and anti-sedimentation agent technology, applied in the direction of magnetic fluid, inductor/transformer/magnet manufacturing, electrical components, etc., can solve the problem of reducing shear yield stress, increasing zero-field viscosity of magnetorheological fluid, and reducing thermal stability To solve the problems of chemical stability and other issues, achieve the effect of high shear stress, low zero-field viscosity and good sedimentation stability

Inactive Publication Date: 2008-04-30
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of this additive greatly increases the zero-field viscosity of the magnetorheological fluid, reduces its thermal and chemical stability, and reduces its shear yield stress to a certain extent.
At present, existing report (Phule P.P., U.S.Patent 5985168) that polymer is added in magnetorheological fluid to improve its sedimentation stability, also has the report (Phule P.P., U.S.Patent 5985168) in carbon nanotube outer coating magnetic material to improve its sedimentation stability (Phule Hong Ting, Jiang Fengjing, Chinese invention patent, application number 200410067824.7), but there is no report of using carbon nanotubes directly as anti-settling agent in magnetorheological fluid

Method used

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  • High property magnetic rheological fluid using carbon nono tube as anti-sedimentation agent and its preparation method
  • High property magnetic rheological fluid using carbon nono tube as anti-sedimentation agent and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The raw materials used in the embodiment are as follows:

[0027] Reduced iron powder (analytical grade) was provided by China National Pharmaceutical (Group) Shanghai Chemical Reagent Company.

[0028] Ethylene glycol (analytical grade) was provided by Shanghai Sanaisi Reagent Co., Ltd.

[0029] Carbon nanotubes (CNTs), Chengdu Organic Chemistry Co., Ltd., Chinese Academy of Sciences, tube diameter 8-15nm, tube length about 50μm, purity>95wt%, specific surface area>233m 2 / g.

[0030] Polyvinylpyrrolidone (PVP), number average molecular weight 2500, product of Polymer Science Company.

[0031] Graphite powder (industrial grade), Qingdao Yanyu Graphite Chemical Co., Ltd.

[0032] The ratio of raw materials used is as follows:

[0033] 61 parts (weight) of reduced iron powder

[0034] 34 parts (weight) of ethylene glycol

[0035] Carbon nanotube 0.6 part (weight)

[0036] 4.4 parts (weight) of polyvinylpyrrolidone (PVP)

[0037] Preparation of magnetorheological ...

Embodiment 2

[0046] The ratio of raw materials used is as follows:

[0047] 70 parts (weight) of reduced iron powder

[0048] 22.2 parts (weight) of ethylene glycol

[0049] Carbon nanotube 0.8 part (weight)

[0050] 7 parts of PVP (weight)

[0051] 1 part of graphite powder (weight)

[0052] Preparation of magnetorheological fluid:

[0053] Divide ethylene glycol into two parts, add PVP to one part, and stir to fully dissolve it. Disperse the reduced iron powder and carbon nanotubes into another part of ethylene glycol, stir until they are evenly dispersed, and the stirring speed is 200-500rpm. Mix the above two mixed liquids under high-speed stirring for 10-30 minutes, and the stirring speed is 2500-3500 rpm.

[0054] The determination of the properties of the prepared magnetorheological fluid is similar to that of Example 1, and its sedimentation performance and magnetorheological properties are also similar to the results shown in Example 1.

Embodiment 3

[0056] The ratio of raw materials used is as follows:

[0057] 64.8 parts (weight) of reduced iron powder

[0058] 26.1 parts (weight) of ethylene glycol

[0059] Carbon nanotube 0.3 part (weight)

[0060] 5.6 parts (weight) of polylactic acid

[0061] 3.2 parts (weight) of graphite powder

[0062] Preparation of magnetorheological fluid:

[0063]Divide ethylene glycol into two parts, add polylactic acid to one part, and stir to fully dissolve it. Disperse the reduced iron powder, graphite, and carbon nanotubes into another portion of ethylene glycol, and stir until they are evenly dispersed at a stirring speed of 200-500rpm. Mix the above two mixed liquids under high-speed stirring for 10-30 minutes, and the stirring speed is 2500-3500 rpm.

[0064] The determination of the properties of the prepared magnetorheological fluid is similar to that of Example 1, and its sedimentation performance and magnetorheological properties are also similar to the results shown in Examp...

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Abstract

This invention discloses a high-performance magnetic current solvent using carbon nanometer tube as anti-sedimentation agent and its preparing method. This magnetic current solvent is composed of the magnetic grains, base-loaded liquor, polymer additive, lube and anti-sedimentation agent and these materials are used according to certain weight. The preparing process of this solvent is very simple, and the operation is very convenient, it has stable sedimentation and wide appliance.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials and functional materials, and in particular relates to a high-performance magnetorheological fluid and a preparation method thereof. Background technique [0002] Magnetorheological fluid is a new type of functional material with unique magnetorheological properties. Because it has the characteristics of low power consumption, large damping force, wide dynamic range, high frequency response, and large application area, especially it can generate the best damping force according to the vibration characteristics of the system, so it is used in shock absorbers and brakes. , fixed brackets, aerospace materials, polishing technology and other aspects have shown broad application prospects. [0003] At present, in order to solve the problem of easy sedimentation of magnetorheological fluid, researchers at home and abroad reduce the sedimentation of magnetorheological fluid by adding various ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/44H01F41/00
Inventor 浦鸿汀蒋峰景杨正龙
Owner TONGJI UNIV
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