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Magnetorheological gel and preparation method thereof

A magnetorheological and magnetic fluid technology, applied in the field of magnetorheology, can solve the problems of reducing density, inability to disperse particles, and large density of particles and carrier liquid, so as to enhance magnetorheological effect, improve settlement stability, and improve mechanical properties. performance effect

Active Publication Date: 2018-09-28
LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing magnetorheological fluid is a kind of uniformly dispersed magnetic particle suspension system. Its mechanical response under the magnetic field is mainly determined by the volume fraction of magnetic particles. However, due to the large density difference between the particles and the carrier liquid, the system Lack of sufficient stability, thus limiting its application and functionality
[0003] Sedimentation stability has always been the most important problem restricting the application of magnetorheological materials. At present, most magnetorheological fluids have high zero-field viscosity and unsatisfactory stability.
If the sedimented magnetic particles agglomerate, even if they are vigorously stirred, the particles cannot be uniformly dispersed into the carrier liquid again, so that the magnetorheological fluid loses its application value
Usually surface modifiers are used to reduce the agglomeration of magnetic particles, adding thixotropic agents to increase the viscosity of the carrier liquid, using polymer-coated magnetic particles to reduce the density, or using double-dispersed magnetic particles can improve the magnetorheological fluid to a certain extent. settlement stability, but will lead to a decrease in yield stress or an increase in zero-field viscosity

Method used

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  • Magnetorheological gel and preparation method thereof
  • Magnetorheological gel and preparation method thereof
  • Magnetorheological gel and preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] Embodiment 1, a magnetorheological glue, including magnetic particles, carrier liquid and a polar solvent immiscible with the carrier liquid; the magnetic particles, carrier liquid and polar solvent are composed of the following volume percentages:

[0032] Magnetic particles: 10~40%,

[0033] Carrier liquid: 60~90%,

[0034] Polar solvent: 0.1~10%.

[0035] The magnetic particles are carbonyl iron powder, the average particle size of the carbonyl iron powder is 1-10 μm; the carrier liquid is mineral oil, silicone oil or polyalphaolefin; the polar solvent is deionized water, ethylene glycol , glycerol, dichloromethane, polyethylene glycol in one or more combinations.

Embodiment 2

[0036] Embodiment 2, a magnetorheological glue, including magnetic particles, carrier liquid and magnetic fluid immiscible with the carrier liquid; the magnetic particles, carrier liquid and magnetic fluid are composed according to the following volume percentage:

[0037] Magnetic particles: 10~40%,

[0038] Carrier liquid: 60~90%,

[0039] Ferrofluid: 0.1~10%.

[0040] The magnetic particles are carbonyl iron powder, and the average particle size of the carbonyl iron powder is 1-10 μm; the carrier liquid is mineral oil, silicone oil or polyalphaolefin; the magnetic fluid includes deionized water and ultrasonic dispersion in the The magnetic particle g-Fe with a particle size of 3-15 nm in deionized water 2 o 3 or Fe 3 o 4 , the magnetic particles g-Fe 2 o 3 or Fe 3 o 4 The volume percentage in the magnetic fluid is 0.1~2%.

Embodiment 3

[0041] Embodiment three, a kind of preparation method of magnetorheological glue, it comprises the following steps:

[0042] 1) Take 12.48g of carbonyl iron powder and dry it for 12 hours under the condition of vacuum degree of 0.1MPa and temperature of 80°C to remove the physically adsorbed water on the surface of carbonyl iron powder;

[0043] 2) Take an appropriate amount of ethylene glycol and add it to 6.27mL of mineral oil, stir it evenly, and then ultrasonically break it for 5 minutes to obtain a mixed solution;

[0044] 3) Add the dried carbonyl iron powder to the mixed liquid obtained in step 2), stir evenly, and then ultrasonically disperse for 5 minutes to obtain a suspension gel;

[0045] 4) Place the suspension glue obtained in step 3) in a vacuum drying oven to remove air bubbles. Under the conditions of a vacuum of 0.2 MPa and a temperature of 25°C, remove air bubbles for 10 minutes to obtain a magnetorheological glue. The composition of the glue is: carbonyl i...

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Abstract

The invention discloses magnetorheological gel and a preparation method thereof. The magnetorheological gel comprises magnetic particles, a carrier liquid and a polar solvent or a magnetic fluid whichis incompatible with the carrier liquid; and the magnetorheological gel is composed of the following components in percentages by volume: 10-40% of the magnetic particles, 60-90% of the carrier liquid, and 0.1-10% of the polar solvent or the magnetic fluid. The magnetorheological gel disclosed by the invention has excellent sedimentation stability and a remarkable magnetorheological effect; and the preparation method is simple and has low costs.

Description

technical field [0001] The invention relates to magnetorheological technology, in particular to a magnetorheological glue and a preparation method thereof. Background technique [0002] The existing magnetorheological fluid is a kind of uniformly dispersed magnetic particle suspension system. Its mechanical response under a magnetic field is mainly determined by the volume fraction of magnetic particles. However, due to the large density difference between the particles and the carrier liquid, the system Lack of sufficient stability, thus limiting its application and functionality. [0003] Sedimentation stability has always been the most important problem restricting the application of magnetorheological materials. At present, most magnetorheological fluids have high zero-field viscosity and unsatisfactory stability. If the settled magnetic particles are agglomerated, even if they are vigorously stirred, the particles cannot be uniformly dispersed into the carrier liquid a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/04C10M177/00H01F1/44C10N30/04C10N40/14
CPCC10M169/04C10M177/00C10M2201/062C10M2201/064C10M2203/1006C10M2205/0206C10M2207/022C10M2209/104C10M2211/022C10M2229/02C10N2030/04C10N2040/185H01F1/447C10N2020/06
Inventor 杨健健胡志德晏华张寒松牛方昊
Owner LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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