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Tin oxalate/titanium oxyoxalate composite powder electrorheological fluid and preparation method thereof

A technology of titanyl oxalate and composite powder, which is applied in lubricating compositions, petroleum industry, additives, etc., can solve the problems of difficulty in realizing engineering application value, inability to achieve industrial application level, low shear strength, etc. The effect of low current density and low cost

Active Publication Date: 2011-11-23
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 it is difficult to realize its engineering application value

Method used

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  • Tin oxalate/titanium oxyoxalate composite powder electrorheological fluid and preparation method thereof
  • Tin oxalate/titanium oxyoxalate composite powder electrorheological fluid and preparation method thereof
  • Tin oxalate/titanium oxyoxalate composite powder electrorheological fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 0.05 mol of tetrabutyl titanate to the absolute ethanol solution under stirring conditions to form an alcohol solution with a molar ratio of 1:20, and add 0.5 ml of glacial acetic acid to prevent the hydrolysis of tetrabutyl titanate to obtain a solution T; Dissolve 0.05mol stannous chloride in absolute ethanol to prepare 0.5mol / l stannous chloride solution S; dissolve 0.1mol oxalic acid in deionized water to prepare 1mol / l oxalic acid solution O; Mix with solution S to obtain mixed solution ST; under the condition of vigorous stirring, in a water bath at 20°C, add the mixed solution ST to solution O, and gradually form a precipitate; after the reaction is complete, continue to stir for 2 hours, and then age for 10 hours; the resulting precipitate was washed three times with deionized water and absolute ethanol, filtered, and dried to obtain the required tin oxalate / titanium oxalate composite powder with a size distribution from nanometer to micrometer.

[0023] The...

Embodiment 2

[0025] Add 0.05mol of titanium tetrachloride to the absolute ethanol solution under stirring to form an alcohol solution with a molar ratio of 1:20, and add 0.5ml of glacial acetic acid to prevent the hydrolysis of tetrabutyl titanate to obtain a solution T; 0.05mol tin protochloride is dissolved in dehydrated alcohol, is mixed with the stannous chloride solution S of 1mol / l; Dissolves 0.1mol oxalic acid in deionized water, is mixed with 1.5mol / l oxalic acid solution O; Solution T and Mix the solutions S to obtain a mixed solution ST; under the condition of vigorous stirring, add the solution O to the mixed solution ST in a water bath at 20°C, and gradually form a precipitate; continue to stir for 2 hours after the reaction is complete, and then age for 12 hours Wash the resulting precipitate three times each with deionized water and absolute ethanol, filter, and dry to obtain the required tin oxalate / titanyl oxalate composite powder with a size distribution from nanometer to m...

Embodiment 3

[0028] Add 0.05 mol of tetraethyl titanate to anhydrous ethanol solution under stirring conditions to form an alcohol solution with a molar ratio of 1:30, and add 0.5 ml of glacial acetic acid to prevent hydrolysis of tetraethyl titanate to obtain solution T; Dissolve 0.05mol tin nitrate in absolute ethanol to prepare 2mol / l tin nitrate solution S; dissolve 0.1mol oxalic acid in deionized water to prepare 2mol / l oxalic acid solution O; mix solution T and solution S, The mixed solution ST is obtained; under the condition of vigorous stirring, in a water bath at 50°C, the mixed solution ST is added to the solution O, and a precipitate is gradually formed; after the reaction is complete, continue to stir for 2 hours, and then age for 14 hours; The precipitate was washed three times with deionized water and absolute ethanol, filtered, and dried to obtain the required tin oxalate / titanyl oxalate composite powder with a size distribution from nanometer to micrometer.

[0029] The ti...

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Abstract

The invention relates to a tin oxalate / titanium oxyoxalate composite powder electrorheological fluid and a preparation method thereof; the tin oxalate / titanium oxyoxalate composite powder electrorheological fluid is a suspending liquid with the volume concentration of 10 to 50 percent which is prepared by taking tin oxalate / titanium oxyoxalate composite powder with size of nanometer to micron as adisperse phase and uniformly dispersing the tin oxalate / titanium oxyoxalate composite powder in silicon oil; and the preparation method is characterized in that: in the condition of water-bath temperature control, coprecipitation method is adopted to mix titaniferous compound and tin salt into a uniform solution which is then mixed with oxalate solution according to a certain proportion, and precipitate of the mixture of tin oxalate and titanium oxyoxalate with nano-scale and micron-scale distribution is obtained by gradual reaction; after drying, the precipitate of the mixture of tin oxalateand titanium oxyoxalate is evenly mixed with the silicon oil to obtain the tin oxalate / titanium oxyoxalate composite powder electrorheological fluid. The tin oxalate / titanium oxyoxalate composite powder electrorheological fluid has strong electrorheological effect, low viscosity of zero field, high static yield strength after voltage application, zero-field yield stress of only 45 Pa, yield stress reaching 115 KPa under 5KV / mm direct-current voltage, high electrorheological effect, low cost, simple preparation process and short cycle.

Description

technical field [0001] The invention relates to an electrorheological fluid and a preparation method thereof, in particular to a tin oxalate / titanyl oxalate composite powder electrorheological fluid and a preparation method thereof. Background technique [0002] Electrorheological fluid is an important smart material, which usually consists of solid particles with high dielectric constant uniformly dispersed in insulating oil with low dielectric constant. It can undergo a liquid-solid transition 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 becomes solid. It is generally believed that this change is due to the fact that the small particles dispersed in the ER fluid are polarized into electric dipoles under the action of an electric field, and strong electrostatic attraction is gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M129/34C10M177/00C10N40/14
Inventor 吴敬华许高杰刘丰华刘雪辉郭建军程昱川崔平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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