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Phase-change magnetorheological material and preparation method thereof

A magnetorheological and phase change technology, applied in the direction of magnetic liquid, can solve the problems of magnetic particle sedimentation, affecting magnetorheological materials, high magneto-induced effect and high stability, etc., to achieve high stability and high magneto-induced effect of effect

Inactive Publication Date: 2016-04-13
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The properties of the matrix itself affect the mechanical properties of magnetorheological materials to a large extent. At present, the magnetorheological fluid based on the liquid carrier liquid as the dispersion medium has a high magnetorheological effect under an external magnetic field, which can meet the requirements of practical engineering. However, the large density difference between the particles and the carrier liquid will easily lead to the sedimentation of the magnetic particles, and it is difficult to take into account the high magnetic effect and high stability at the same time

Method used

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specific Embodiment approach

[0021] The preferred embodiment of the phase-change magnetorheological material of the present invention is:

[0022] It includes matrix material, magnetic particles, and surfactant. The matrix material includes paraffin wax mixed with white petrolatum at a mass ratio of 1.5:1-1:1.5. The magnetic particle is carbonyl iron powder. The surfactant is any of the following: One or more: stearic acid, oleic acid, sodium stearate, polyethylene glycol, silane coupling agent, Tween;

[0023] The matrix material, magnetic particles, and surfactants are proportioned according to the following parts by mass:

[0024] Matrix material: 38.2-69.1 parts;

[0025] Magnetic particles: 30-60 parts;

[0026] Surfactant: 0.9-1.8 parts.

[0027] The average particle diameter of the carbonyl iron powder is 0.1-50 μm.

[0028] The preparation method of the above-mentioned phase-change magnetorheological material of the present invention, its preferred embodiment comprises the following steps:

...

specific Embodiment 1

[0040] Get the raw material of following mass fraction:

[0041] Carbonyl iron powder (average particle size: 3.5 μm): 30%;

[0042] Surfactant: 0.9%

[0043] Paraffin: 34.55%

[0044] Vaseline: 34.55%

[0045] The preparation steps of materials involved in the present invention are as follows:

[0046] Add the paraffin wax, white petrolatum, and surfactant of the above quality into the conical flask, heat to 80°C to completely melt the three substances, and stir to mix evenly;

[0047] Weigh the above-mentioned carbonyl iron powder and add it to the Erlenmeyer flask;

[0048] Stop heating and continue to stir until the system cools down to room temperature. After the system solidifies, take out the sample, clean the experimental equipment and dry it.

[0049] The phase transition temperature of the magnetorheological material matrix of the present invention is 49.78°C, which is moderate and easy to reach, and the phase transition can be realized by simple heating, see f...

specific Embodiment 2

[0051] Get the raw material of following mass fraction:

[0052] Carbonyl iron powder (average particle size: 3.5 μm): 40%;

[0053] Surfactant: 1.2%

[0054] Paraffin: 29.4%

[0055] Vaseline: 29.4%

[0056] Others are the same as embodiment 1.

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Abstract

The invention discloses a phase change type magnetorheological material and a preparation method thereof. The phase change type magnetorheological material comprises the following materials in part by mass: 38.2-69.1 parts of base materials, 30-60 parts of magnetic particles and 0.9-1.8 parts of surfactant. The base materials comprise paraffin wax and albolene, and the mass ratio of the paraffin wax to the albolene is 1.5:1-1:1.5. The magnetic particles are carbonyl iron powder. The phase change type magnetorheological material has a high magneto-induced effect and high stability, has the physical property of non-solvent type magnetorheological elastomer at room temperature, is converted into a fluid state from a viscoplastic state at high temperature (about 50 DEG C) due to the phase change performance of the base materials, and has typical characteristics of magnetorheogical fluid, namely, the phase change type magnetorheological material can be freely converted from magnetorheogical fluid to magnetorheogical elastomer or from the magnetorheogical elastomer to the magnetorheogical fluid along temperature change.

Description

technical field [0001] The invention relates to an intelligent material technology, in particular to a phase-change magnetorheological material and a preparation method thereof. Background technique [0002] Magnetorheological materials are an important branch of the current smart material research field, and are usually composed of magnetically dispersed phase particles (μm scale), matrix and additives, etc. uniformly mixed. After applying an external magnetic field, the mechanical properties (rheological properties or viscoelastic properties, etc.) of this material will change rapidly and reversibly. Based on this characteristic, since J. Rabinow first discovered magnetorheological fluid in the late 1940s, this smart material has triggered a new wave of research and has been widely used in fields such as engineering and biomedicine. At present, magnetorheological materials mainly include three types: magnetorheological fluid, magnetorheological glue and magnetorheological...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/44
Inventor 江万权张燕丽宣守虎龚兴龙许阳光
Owner UNIV OF SCI & TECH OF CHINA
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