Electrorheological fluid and preparation method thereof

A technology of electrorheological fluid and conductivity, which is applied in the petroleum industry, additives, lubricating compositions, etc., can solve problems hindering the development of electrorheological fluid, and achieve excellent electrorheological performance, large dynamic shear stress, and simple and easy preparation method line effect

Active Publication Date: 2019-01-11
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is a common shortcoming of electrorheological fluid materials, which has become a bottleneck hindering the development of electrorheological fluids

Method used

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  • Electrorheological fluid and preparation method thereof
  • Electrorheological fluid and preparation method thereof
  • Electrorheological fluid and preparation method thereof

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[0048] As another aspect of the technical solution of the present invention, it relates to a method for preparing an electrorheological fluid, which includes:

[0049] providing a first hybrid system comprising a metal organic framework material, a surfactant and a solvent;

[0050] providing a second hybrid system comprising an organic titanate;

[0051] mixing the second mixing system with the first mixing system to react to obtain a metal organic framework-titanium oxide composite;

[0052] The metal organic framework-titanium oxide composite is uniformly dispersed in the insulating liquid to obtain the electrorheological fluid.

[0053] In some embodiments, the mass ratio of the metal organic framework material, the surfactant, and the organic titanate is 1:0.1˜4:3˜20.

[0054] Wherein, the metal organic framework material may be any metal organic framework prepared by methods known in the art.

[0055] In some embodiments, the metal organic framework material is prefer...

Embodiment 1

[0078] (1) Weigh 0.055g MIL-101(Cr) (specific surface area 2483m 2 / g) was dispersed in 55mL of absolute ethanol / water mixed solvent (volume ratio 1:0.1), and then 0.0055g of sodium dodecylbenzenesulfonate was added to obtain suspension A;

[0079] (2) Dissolve 0.5 g of tetrabutyl titanate in 50 mL of absolute ethanol and stir for half an hour to obtain solution B;

[0080] (3) Add solution B dropwise to solution A, continue to stir for four hours after the dropwise addition is complete, then let it stand and age for 10 hours; filter, wash and dry the precipitate to obtain the required MIL-101 ( Cr)-titanium oxide composite particles.

[0081] (4) Disperse the composite particles obtained above in silicone oil to prepare a MIL-101(Cr)-titanium oxide composite electrorheological fluid with a mass fraction of 40 wt%. Such as Figure 1-Figure 3 As shown, the electrorheological fluid is in the electric field of 4kV / mm, and the shear rate is 100s -1 When the dynamic shear stres...

Embodiment 2

[0083] (1) Weigh 0.084g MIL-101(Fe) (specific surface area 2265m 2 / g) was dispersed in 105mL absolute ethanol / water mixed solvent (volume ratio 1:0.05), and then 0.336g sodium lauryl sulfate was added to obtain suspension A;

[0084] (2) Dissolve 0.25 g of ethyl titanate in 50 mL of absolute ethanol and stir for half an hour to obtain solution B;

[0085] (3) Add solution B dropwise to solution A, continue to stir for four hours after the dropwise addition is complete, then let it stand and age for 10 hours; filter, wash and dry the precipitate to obtain the required MIL-101 ( Fe)-titanium oxide composite particles.

[0086] (4) Disperse the composite particles obtained above in castor oil to prepare a MIL-101(Fe)-titanium oxide composite electrorheological fluid with a mass fraction of 20 wt%. Such as Figure 4-Figure 6 As shown, the electrorheological fluid is in the electric field of 4kV / mm, and the shear rate is 100s -1 When the dynamic shear stress is 39.8kPa, the le...

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Abstract

The invention discloses electrorheological fluid and a preparation method thereof. The electrorheological fluid comprises a dispersion phase and a dispersion medium, wherein the dispersion phase comprises a metal-organic framework-titanium oxide complex; the dispersion medium comprises insulating liquid; and the dispersion phase is uniformly dispersed in the dispersion medium. The preparation method comprises the following steps: providing a first mixed system containing a metal-organic framework material, a surfactant and a solvent; providing a second mixed system comprising organic titanate;mixing the second mixed system with the first mixed system, and reacting to obtain the metal-organic framework-titanium oxide complex; and uniformly dispersing the metal-organic framework-titanium oxide complex into the insulating liquid, thereby obtaining the electrorheological fluid. The electrorheological fluid disclosed by the invention is high in dynamic shear stress, excellent in stability,low in leakage current density and excellent in subsidence resistance, and the preparation method is simple, feasible and low in cost.

Description

technical field [0001] The invention relates to an electrorheological fluid, in particular to a metal organic framework / titanium oxide composite electrorheological fluid and a preparation method thereof, belonging to the technical field of electrorheological fluid. Background technique [0002] Electrorheological fluid is a suspension formed by dispersing dielectric particles (dispersed phase) in insulating liquid (dispersed medium). After the electric field is applied, the dielectric particles in it can be arranged in chains along the direction of the electric field in the dispersion medium, and the macroscopic performance is that the viscosity of the system increases with the increase of the electric field intensity, and can be formed in a very short time by The liquid state turns into a quasi-solid state; after the electric field is removed, the electrorheological fluid can quickly change from a solid-like structure back to a liquid state. Electrorheological fluid is a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M161/00C10N30/04
CPCC10M161/00C10M2201/062C10M2207/402C10M2229/00C10M2229/025C10N2030/04C10N2030/60
Inventor 程昱川牛益民华乐天李志祥刘丰华孙爱华郭建军许高杰晏育刚陆祥芳
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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