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Composite magnetorheological fluid

A magnetorheological fluid and composite technology, applied in the direction of magnetic fluid, can solve the problems of instability in the second Newton zone, affecting the high shear rate flow performance of magnetorheological fluid, and high environmental protection requirements, so as to improve the anti-settling performance , low initial kinematic viscosity and excellent mechanical properties

Pending Publication Date: 2021-04-20
SHENZHEN BOHAI NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, nano magnetorheological fluid still has its inherent defects, for example, its preparation process takes a long time, the process is complicated, the environmental protection requirements are high, and the material cost is higher, resulting in higher cost than traditional magnetorheological fluid.
In addition, the specific surface area (specific surface energy) of anisotropic magnetic powder is larger, so the magnetorheological fluid is thicker, the second Newton zone of the magnetorheological fluid is larger, the initial force is larger, and the controllable range is limited to a certain extent
Anisotropic magnetic powder may affect the high shear rate flow performance of magnetorheological fluid under zero magnetic field due to its anisotropic shape, such as large aspect ratio, making the second Newton region unstable under zero magnetic field, which is not conducive to device control and Vibration control

Method used

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  • Composite magnetorheological fluid
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Examples

Experimental program
Comparison scheme
Effect test

example I

[0051] Prepare the carrier fluid of the composite magnetorheological fluid, which can use mineral oil, synthetic oil, α-olefin or silicone oil, etc., which can be purchased from the market.

[0052] Additives for preparing the composite magnetorheological fluid, optional additives include but not limited to organoclay, molybdenum disulfide, fumed silica, etc., all of which can be purchased from the market.

[0053] The steps of a preparation process of composite magnetorheological fluid are as follows.

[0054] Step 1. Disperse the additives

[0055] The process that can be adopted in this step can be selected from a kind of in following:

[0056] 1. Add organoclay and fumed silica at room temperature into a container of an ultrasonic mixer (for example, model JM-1018), and perform ultrasonic stirring and dispersion treatment for about 20 minutes at a stirring frequency of about 30 Hz;

[0057] 2. Add organoclay and fumed silica at room temperature to a circulating sand mi...

example II

[0071] The preparation process, steps, equipment, raw materials, components, parameters, etc. of this example and Example I are basically the same, the difference is that the anisotropic magnetic powder adopts single crystal anisotropic magnetic powder, and the added single crystal isotropic The heterosexual magnetic powder accounts for 2% of the total weight of the magnetorheological fluid.

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Abstract

The present invention discloses a composite magnetorheological fluid. The fluid comprises:0.05-5 wt% of anisotropic magnetic powder; 70-90 wt% of a micron-scale isotropic magnetic powder; and the balance of a carrier liquid and an additive added into the carrier liquid.

Description

technical field [0001] The invention relates to the technical field of magnetorheological fluid. More specifically, the present invention relates to the preparation of composite magnetorheological fluid by using the combination of isotropic magnetic powder and anisotropic magnetic powder. Background technique [0002] A magnetorheological fluid is a fluid whose viscosity changes with the application of a magnetic field. It is a stable suspension system composed of soft magnetic particles with high magnetic permeability and low remanence evenly dispersed in non-magnetic carrier liquid through the action of surfactant. The working principle of magnetorheological fluid is: under the action of an external magnetic field, each particle is polarized into a magnetic dipole, and each dipole attracts each other, and the chain-like structure formed between the two magnetic pole plates is like a bridge. Between the plates, the normal flow of the fluid is blocked, giving it a solid-li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44
CPCH01F1/44
Inventor 秦浩梁燕玲
Owner SHENZHEN BOHAI NEW MATERIAL TECH CO LTD
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