A magnetic rheological fluid and preparing method thereof

A technology of magnetorheological fluid and carrier fluid, which is applied in the direction of magnetic fluid, chemical instruments and methods, chemical/physical/physicochemical processes, etc. It can solve the problems of high price, achieve easy operation, not easy to fall off, and increase suspension stability sexual effect

Inactive Publication Date: 2005-03-16
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current commercialized magnetorheological fluid materials are mainly pr...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] Example 1: (1). Preparation of carboxymethyl dextran derivatives: Dissolve 10 grams of dextran 20,000 in 100 ml of water, add 12 grams of NaOH and 7.9 grams of chloroacetic acid, and heat with magnetic stirring at a temperature of 37 ° C. Reaction 3 Hour. Then dialyze with a dialysis bag, freeze-dry for 24 hours, and the white powder is carboxylated dextran.

[0030] (2). Preparation of magnetic particles coated with silicon oxide on the silanized surface.

[0031] (3). Cross-linking of organic polymers coated on the surface of magnetic particles: Mix 10 grams of magnetic particles and 2 grams of carboxylated dextran with 10 ml of water, magnetically separate, add 2 ml of ethylenediamine buffer and mix, then add 40 mg of carbon dioxide Imine (EDC), reacted for 3 hours, dialyzed with a dialysis bag to remove excess ethylenediamine and salt, and freeze-dried to obtain magnetic particles with polymers cross-linked on the surface and active groups.

[0032] (4). Take 92% ...

Embodiment 2

[0033] Embodiment 2: Take 80% of iron powder, 8% of polymer compound for cross-linking, 8% of carrier liquid silicone oil and 2% of additive nano silicon dioxide, and mix and stir to form a magnetorheological fluid.

Embodiment 3

[0034] Embodiment 3: 67% of iron powder, 15% of polymer compound for cross-linking, 13% of carrier liquid silicone oil and 5% of additive nano silicon dioxide are mixed and stirred to form magnetorheological fluid.

[0035] The magnetorheological fluids prepared in Examples 1, 2, and 3 have no magnetic particles agglomerated, and the solid-liquid phase transition is reversible. The sedimentation rate of suspended particles and the mechanical properties of magnetorheological fluids have reached or exceeded foreign countries. Performance of similar products.

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Abstract

The invention relates to a magnetic rheologic liquid and its manufacture method. The magnetic rheologic liquid is stable suspension containing micronsized magnetic particle and carrier liquid and magnetic particle and high molecular compound re cross linked on surface, whose composition ratio according to weight percentage is magnetic particle 67-94%, high molecular compound 1-24% and carrier liquid 4-20%. Some supplements whose weight percentage is not larger than 5% can be added into carrier liquid, whose manufacture method is that, firstly produce magnetic particle or magnetic particle covered by silicon oxide and aluminium oxide, then make the magnetic particle to be that which has cross linked on surface with high molecular compound, finally mix and stir the mixture of magnetic particle, carrier liquid and added substance to be magnetic rheologic liquid according to suitable match. The invention has its stability of suspension, mechanical behavior of magnetic rheologic liquid and reversibility of solid-liquid phase transformation all reach the level of magnetic rheologic liquid imported and is suitable in the fields like aerospace, mechanical engineering, automobile industry, precision finishing, building engineering and medical and health.

Description

Technical field: [0001] The invention relates to a magnetorheological fluid. Background technique: [0002] Magneto-rheological fluid (Magnetic Rheological Fluid, MRF) is a stable suspension liquid composed of micron-sized (1-10 μm) magnetic particles, carrier liquid (mineral oil, silicone oil, etc.) and surfactants. Under the action of an external magnetic field, it will produce obvious magneto-rheological effect: it can perform rapid and reversible transition between solid and liquid in milliseconds (within 10 milliseconds), with a wide range of changes, continuous stepless control of viscosity, and minimal energy consumption. Moreover, the "curing" effect varies with the magnitude of the applied magnetic field. Real-time active control can be realized by controlling the excitation current to change the magnetic field. Magneto-rheological fluids are widely used in aerospace, mechanical engineering, automobile industry, precision machining, construction engineering, medical...

Claims

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Application Information

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IPC IPC(8): B01J19/00H01F1/44
Inventor 刘书朋严壮志
Owner SHANGHAI UNIV
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