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Three-phase magnetorheological fluid and preparation method thereof

A magnetorheological fluid and three-phase technology, applied in the direction of magnetic fluids, magnetic materials, magnetic objects, etc., can solve the problem of increasing the quality and size of magnetorheological devices, increasing the power load of magnetorheological devices, Increased field viscosity and other issues to achieve the effect of improving magnetic permeability, improving mechanical properties and enhancing magnetorheological effect

Active Publication Date: 2018-08-03
LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it will lead to an increase in the zero-field viscosity of the magnetorheological fluid, an increase in the quality and size of the magnetorheological device, and an increase in the power load of the magnetorheological device.
Selecting alloy particles or non-spherical particles with larger saturation magnetization can enhance the magnetorheological effect, but for most practical applications, the material preparation is complicated and the cost is high
The shear yield stress of MR fluids can be increased through squeeze mode or electromagnetic field synergy at the expense of increased device complexity

Method used

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  • Three-phase magnetorheological fluid and preparation method thereof
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Embodiment 1

[0026] Embodiment 1, a three-phase magnetorheological fluid, is characterized in that: it is composed of the following components by volume percentage:

[0027] Magnetic particles: 5~40%, carrier liquid: 60~90%, magnetic fluid:, emulsifier: 0.05~5%, co-surfactant: 0.03~3%;

[0028] The magnetic particles are carbonyl iron powder or magnetic ferrite powder, and the average particle diameter of the magnetic particles is 1-10 μm.

[0029] The carrier liquid is one or more combinations of water, alcohol, alkane, vegetable oil, mineral oil, silicone oil and polyalphaolefin;

[0030] The magnetic fluid is a water-based magnetic fluid or an oil-based magnetic fluid, including a solvent and magnetic particles with a particle size of 3 to 15 nm ultrasonically dispersed in the solvent, and the magnetic particles are g-Fe 2 o 3 , Fe 3 o 4 Or iron-cobalt-nickel alloy nanoparticles, the volume percentage in the magnetic fluid is 0.1~2%.

[0031] When the magnetic fluid is water-based ...

Embodiment 2

[0033] Embodiment two, a kind of preparation method of three-phase magnetorheological fluid, it comprises the following steps:

[0034] 1) Take 0.78g of carbonyl iron powder and dry it for 15 hours under the conditions of vacuum degree of 0.1MPa and temperature of 90°C to remove the physically adsorbed water on the surface of carbonyl iron powder;

[0035] 2) Prepare ferrofluid and prepare Fe by chemical co-precipitation method 3 o 4 Magnetic particles, the specific steps are;

[0036] a. Mix the ferrous salt and the ferric salt in a certain proportion, add the precipitant ammonia solution and stir, and react for a period of time to obtain black Fe 3 o 4 Colloidal particle precipitation, the reaction formula is:

[0037] 2FeCl 3 ·6H 2 O+FeCl 2 4H 2 O+8NH 3 ·H 2 O=Fe 3 o 4 +8NH 4 Cl+24H 2 O;

[0038] b. After washing and separating the black precipitate with water, add HNO 3 The solution was stirred, then Fe(NO 3 ) 3 The solution is boiled and g-Fe is obtained...

Embodiment 3

[0044] Embodiment three, a kind of preparation method of three-phase magnetorheological fluid, it comprises the following steps:

[0045] 1) Take 1.56g of carbonyl iron powder and dry it for 15 hours under the conditions of vacuum degree of 0.1MPa and temperature of 90°C to remove the physically adsorbed water on the surface of carbonyl iron powder;

[0046] 2) Prepare ferrofluid and prepare Fe by chemical co-precipitation method 3 o 4 Magnetic particles, the specific steps are;

[0047] a. Mix the ferrous salt and the ferric salt in a certain proportion, add the precipitant ammonia solution and stir, and react for a period of time to obtain black Fe 3 o 4 Colloidal particle precipitation, the reaction formula is:

[0048] 2FeCl 3 ·6H 2 O+FeCl 2 4H 2 O+8NH 3 ·H 2 O=Fe 3 o 4 +8NH 4 Cl+24H 2 O;

[0049] b. After washing and separating the black precipitate with water, add HNO 3 The solution was stirred, then Fe(NO 3 ) 3 The solution is boiled and g-Fe is obtain...

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Abstract

The invention relates to a three-phase magnetorheological fluid and a preparation method thereof. The three-phase magnetorheological fluid is prepared from, by volume, 5-40% of magnetic particles, 60-90% of carrier liquid, 0.5-15% of magnetic fluid, 0.5-5% of emulsifier and 0.03-3% of cosurfactant. The viscosity of a null field of the three-phase magnetorheological fluid is low, magnetic induced energy storage modulus is high, the three-phase magnetorheological fluid has stronger magneto-rheological effect, the preparation method is simple, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of intelligent materials and preparation, in particular to a three-phase magnetorheological fluid and a preparation method thereof. Background technique [0002] Magnetorheological fluid is a two-phase suspension system formed by uniformly dispersing micron-sized magnetic solid particles in a liquid medium. Its physical state and rheological properties can change with the change of the applied magnetic field: the performance without an external magnetic field It is a liquid with a good flow state, and under the action of a strong magnetic field, the viscosity can instantly increase by more than two orders of magnitude, and exhibits mechanical properties similar to solids. Once the magnetic field is removed, it becomes a free-flowing fluid. [0003] The preparation of magnetorheological materials with high magnetic effect and relatively stable has very attractive application value. Generally speaking, the yi...

Claims

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Application Information

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IPC IPC(8): H01F1/44C08L91/06C08K3/18C08K3/22
CPCC08K3/18C08K3/22C08K2003/2275C08K2201/01H01F1/445H01F1/447C08L91/06
Inventor 杨健健晏华王大伟胡志德张寒松
Owner LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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