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High-stability multi-phase composite electrorheological fluid and preparation method thereof

A compound current, high-stability technology, used in lubricating compositions, petroleum industry, additives, etc., can solve the problem of limiting the application range and application effect of electrorheological fluid devices, loss of use function, conductive particles settling hard lumps or cakes, etc. problem, to achieve the effect of good temperature stability, stable performance and simple preparation method

Inactive Publication Date: 2009-12-02
NO 52 INST OF CHINA NORTH IND GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the rheological mechanism of electrorheological fluid has not been fully revealed, especially the problem that the conductive particles are prone to serious sedimentation after long-term standing to form hard lumps or cakes, thus losing the function of use. A good solution, which greatly limits the application range and application effect of electrorheological fluid devices

Method used

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  • High-stability multi-phase composite electrorheological fluid and preparation method thereof
  • High-stability multi-phase composite electrorheological fluid and preparation method thereof
  • High-stability multi-phase composite electrorheological fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] a) Preparation of base liquid

[0043] Will

[0044] Trifluoropropylmethylcyclotrisiloxane 60v%

[0045] Simethicone 35v%

[0046] Methyl silicone oil 5v%

[0047] Mix evenly to obtain compound base liquid;

[0048] b) Putting the nano-scale nickel powder into the NaOH solution with a concentration of 6mol / L in the ratio of 1:30 by the weight ratio of nano-nickel and NaOH solution, and ultrasonically stirring evenly to make the Ni surface hydroxylated; then press the nickel powder Add 0.5wt% sodium dodecylbenzenesulfonate by weight, carry out dispersion treatment, then wash with deionized water until neutral, separate the precipitate to obtain particle A; the structure diagram of particle A is as follows Figure 4 shown;

[0049] c) Add an absolute ethanol solution of barium titanate with a volume ratio of 1:1 to particle A, wherein the molar ratio of particle A to barium titanate is 4:1, and ultrasonically stir for sol-gel reaction, namely titanate Barium undergo...

Embodiment 2

[0055] a) Preparation of base liquid

[0056] Trifluoropropylmethylcyclotrisiloxane 80v%

[0057] Simethicone 20v%

[0058] Mix evenly to obtain compound base liquid.

[0059] b) adding the nanometer copper and NaOH solution into the NaOH solution with a concentration of 8mol / L in a ratio of 1:45 by weight and stirring evenly; then adding 0.8wt% sodium dodecylbenzenesulfonate according to the amount of copper , stir until the reaction is complete to obtain a precipitate, wash with deionized water until neutral to separate the precipitate to obtain Particle A;

[0060] c) Add an anhydrous ethanol / tetrabutyl titanate solution with a volume ratio of 1:1.25 to particle A, wherein the molar ratio of particle A to tetrabutyl titanate is 6:1, stir until no precipitation occurs, and Particle B is obtained by precipitation and separation; the particle B is dried in a vacuum drying oven at 100-130°C to obtain composite particles;

[0061] c) Composite particles, sodium dodecylbenzen...

Embodiment 3

[0064] a) The ratio of nanometer copper and NaOH solution is 1: 40 by weight and is added into the NaOH solution with a concentration of 6mol / L and stirred evenly; then add 0.5wt% sodium dodecylbenzenesulfonate according to the amount of copper , stir until the reaction is complete to obtain a precipitate, wash with deionized water until neutral to separate the precipitate to obtain Particle A;

[0065] b) Add an anhydrous ethanol / tetrabutyl titanate solution with a volume ratio of 1:1.5 to particle A, wherein the molar ratio of particle A to tetrabutyl titanate is 8:1, stir until no precipitation occurs, and Particle B is obtained by precipitation and separation; the particle B is dried in a vacuum drying oven at 100-130°C to obtain composite particles;

[0066] c) Mix the composite particles, sodium dodecylbenzenesulfonate and simethicone evenly to obtain an electrorheological fluid with a volume concentration of 40% of the composite particles; The adding amount of sodium b...

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Abstract

The invention relates to a high-stability multi-phase composite electrorheological fluid and a preparation method thereof. The electrorheological fluid comprises the following structure: liquid insulating medium is taken as a base fluid, and dispersion medium is evenly dispersed in the base fluid. The high-stability multi-phase composite electrorheological fluid is characterized in that the dispersion medium is composite particles which take nanometer nickel or copper as cores and titanium dioxide as shell layers and have core-shell structures, the volume concentration of the dispersion medium is between 30 and 40 percent, and the high-stability multi-phase composite electrorheological fluid also comprises 0.05 to 3 weight percent (the total amount of composite particles and a base fluid) of sodium dodecylbenzebesuefonate at the same time. The preparation method thereof comprises the steps of: hydroxylating metal particles first, then coating titanium dioxide on the hydroxylated metal particles, and finally mixing the metal particles with the dodecylbenzebesuefonate and the based fluid evenly to obtain the high-stability multi-phase composite electrorheological fluid. Compared with the prior art, the high-stability multi-phase composite electrorheological fluid has the advantages of simple preparation method, steady performance, and good settling resistance, and the shear strength can be improved to more than 50MPa; and the use of the composite base fluid can ensure that the density of the electrorheological fluid is improved by more than 20 percent, and the stability is greatly improved.

Description

technical field [0001] The invention relates to an electrorheological fluid and a preparation method thereof, in particular to a high-stability multiphase composite electrorheological fluid whose dispersion medium is a core-shell structure and a preparation method thereof. Background technique [0002] Electrorheological fluid is generally a suspension formed by dispersing polarizable particles in a base fluid. When an electric field is applied to it, its viscosity and shear strength change several orders of magnitude instantaneously, from a low-viscosity fluid that is easy to flow to a high-viscosity viscoelastic solid that is difficult to flow or does not flow. When the electric field is removed, it can instantly return to the liquid state. This change is reversible and continuous, showing good electrical control mechanical behavior. The adjustable damper made of it has a simple structure, no special processing, no relative moving parts, no impact between metals, stable a...

Claims

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Application Information

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IPC IPC(8): C10M141/08C10M135/10C10M125/00C10N40/16C10N30/04
Inventor 谭锁奎郭红燕赵红纪松吴敏钱坤明
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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