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Titanium oxyoxalate electrorheological fluid and preparation method thereof

A technology of titanyl oxalate and electrorheological fluid, applied in the direction of lubricating composition and the like, can solve the problems of inability to reach the level of industrial application, low shear strength, etc., and achieve the effects of short cycle, low cost and good application prospect.

Active Publication Date: 2010-07-07
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, a variety of electrorheological fluids have been found to produce electrorheological effects, but the shear strength of most of the existing electrorheological fluids is low, generally not higher than 10kPa, which cannot reach the level of industrial application and realize the value of engineering application

Method used

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  • Titanium oxyoxalate electrorheological fluid and preparation method thereof
  • Titanium oxyoxalate electrorheological fluid and preparation method thereof
  • Titanium oxyoxalate electrorheological fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Mix 17.4ml tetrabutyl titanate and ethanol at a molar ratio of 1:50, stir evenly, and then add hydrochloric acid dropwise to control the pH of the solution to 2.0 to obtain a stable solution A; Dissolve in ethanol and prepare 1mol / l oxalic acid ethanol solution B; put solution A on a mixer and stir, take 50ml of solution B and drop it into solution A, gradually forming a precipitate; after the reaction is complete, filter the formed precipitate After drying, titanyl oxalate particles with sizes ranging from nanometers to micrometers are obtained. The XRD patterns of titanyl oxalate particles are as follows Figure 5 shown, from Figure 5 It can be seen that the titanyl oxalate particles are in an amorphous state; Image 6 is the infrared transmission spectrum of the titanyl oxalate particles, by Image 6 It can be seen that the characteristic absorption peaks of its carboxyl and hydroxyl groups.

[0027] The titanyl oxalate particles are uniformly mixed with methyl ...

Embodiment 2

[0029] Mix 5.5ml of titanium tetrachloride and isopropanol in a molar ratio of 1:40, stir evenly, then add nitric acid dropwise to control the pH value of the solution to 1.5, to obtain a stable solution A; Dissolve in isopropanol, and prepare 0.5mol / l oxalic acid isopropanol solution B; put solution A on a mixer and stir, take 100ml of solution B and drop it into solution A, and gradually form a precipitate; after the reaction is complete, put The resulting precipitate is filtered and then dried to obtain titanyl oxalate particles with the required nanometer to micrometer size distribution.

[0030] The titanyl oxalate particles were uniformly mixed with hydroxyl silicone oil to prepare titanyl oxalate electrorheological fluids with a volume concentration of 15%, 20% and 30%. When the applied electric field V=4.0kV / mm, the yield strength of 15% electrorheological fluid is 16kPa, and the current density is 8uA / cm 2 ; The yield strength of 20% electrorheological fluid can reac...

Embodiment 3

[0032] Mix 17.4ml tetrabutyl titanate and propanol in a molar ratio of 1:30, stir evenly, then add hydrochloric acid or nitric acid dropwise to control the pH value of the solution to 1.0 to obtain a stable solution A; Amount of oxalic acid was dissolved in propanol to prepare 0.5mol / l oxalic acid propanol solution B; put solution A on a mixer and stir it, take 100ml solution B and drop it into solution A, gradually forming a precipitate; after the reaction was complete, put The resulting precipitate is filtered and then dried to obtain titanyl oxalate particles with the required nanometer to micrometer size distribution.

[0033] The titanyl oxalate particles are uniformly mixed with methyl silicone oil to prepare titanyl oxalate electrorheological fluids of the present invention with volume concentrations of 10%, 20% and 30%. When the applied electric field V=5.0kV / mm, the yield strength of 10% electrorheological fluid is 10kPa, the shear strength is 5kPa, and the current de...

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Abstract

The invention relates to a titanium oxyoxalate electrorheological fluid and a preparation method thereof. The titanium oxyoxalate electrorheological fluid is characterized by using titanyl oxalate particles in nanometer to micron sizes as a dispersing phase and uniformly dispersing in silicon oil to form the suspended liquid. The titanyl oxalate particles in the suspended liquid have the volume concentration of 5-40 percent. The preparation method of the titanium oxyoxalate electrorheological fluid comprises the following steps of: firstly, carrying out a chemical precipitation reaction of oxalic acid and titanium of the same mol number in an alcohol solvent to prepare titanyl oxalate particles; uniformly mixing the titanyl oxalate particles with the silicon oil; and obtaining the titanium oxyoxalate electrorheological fluid. The titanium oxyoxalate electrorheological fluid provided by the invention has strong electrorheological effect, reaches the stress yield of 120kPs and the dynamic shearing stress of 40kPa when an external electric field is 5kV / mm, has the advantages of small current density, no toxicity, environmental protection, and the like and has favorable application prospects. Moreover, the needed raw materials are easily obtained and have low cost, and the preparation process is simple and has short cycle.

Description

technical field [0001] The invention relates to an electrorheological fluid and a preparation method thereof, in particular to a titanyl oxalate electrorheological fluid and a preparation method thereof. Background technique [0002] Electrorheological fluid is a uniform suspension liquid whose viscosity can change significantly under the action of an external electric field. It has the quality of controlled change, and its yield stress and elastic modulus can change according to the will of the controller. It is usually composed of solid particles with high dielectric constant uniformly dispersed in insulating oil with low dielectric constant. Under normal conditions, it is a suspension, which can undergo liquid-solid transformation under the action of an electric field. When the applied electric field strength is much lower than a certain critical value, the electrorheological fluid is liquid; when the electric field strength is much higher than this critical value, it bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M171/00
Inventor 刘丰华许高杰吴敬华程昱川郭建军崔平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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