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Electrorheological fluid of high-dielectric constant CaCu3Ti4O12 hybrid-modified particles and preparation method thereof

A high dielectric constant, electrorheological fluid technology, applied in the petroleum industry, lubricating compositions, etc., can solve the problem of low conductivity and dielectric loss, and achieve the effect of improving wettability, high comprehensive performance, and improving performance

Inactive Publication Date: 2011-02-09
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

Although barium titanate has a high dielectric constant (about 1000), its conductivity (almost an insulator) and dielectric loss are low, so further modification of the titanium-oxygen dielectric material improves its dielectric Performance has become the technical key to the development of high-performance electrorheological materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] a) Prepare base fluid

[0028] Mix chlorinated paraffin (5v%), fluorinated silicone oil (75v%) and dimethicone (20v%) to obtain a compound base liquid;

[0029] b) Put the particles produced by the sol-gel method into a NaOH solution with a concentration of 6mol / L, stir evenly to hydroxylate the surface of the particles; after dispersion treatment, wash with deionized water to neutralize the precipitate to separate the particles A;

[0030] c) Place particles A in a vacuum drying oven at 110-130°C for heat treatment to obtain CCTO particles;

[0031] d) Mix the composite particles, dispersant (0.05% SDBS) and base fluid uniformly to obtain an electrorheological fluid with a certain volume concentration of composite particles;

[0032] The maximum intensity is 158kPa when the electric field is 4kV / mm.

Embodiment 2

[0034] a) Preparation of base fluid

[0035] Mix chlorinated paraffin (5v%), fluorinated silicone oil (80v%) and dimethicone (15v%) to obtain a compound base liquid;

[0036] b) Add the particles produced by the sol-gel method to a NaOH solution with a concentration of 8mol / L at a weight ratio of 1:45 and stir evenly; stir until the reaction is complete to obtain a precipitate, and the precipitate is separated to obtain particles A;

[0037] c) Add the ethanol-tetrabutyl titanate solution with a volume ratio of 1:1.25 to the particles A, wherein the molar ratio of the particles A to the tetrabutyl titanate is 6:1, stir uniformly, and separate and precipitate to obtain the particles B;

[0038] c) Add an ethanol mixed solution containing deionized water and urea (or SDBS, TEA) to the microparticle B, wherein the volume ratio of deionized water: urea (or SDBS, TEA): absolute ethanol is 1:4:10 , The weight ratio of urea (or SDBS, TEA) and particles B is 1:4, stir evenly until the reactio...

Embodiment 3

[0041] a) Preparation of base fluid

[0042] Mix chlorinated paraffin (5v%), fluorinated silicone oil (40v%) and dimethyl silicone oil (55v%) to obtain a compound base liquid;

[0043] b) Add the particles produced by the sol-gel method to a NaOH solution with a concentration of 8mol / L at a weight ratio of 1:45 and stir evenly; stir until the reaction is complete to obtain a precipitate, and the precipitate is separated to obtain particles A;

[0044] c) Add the ethanol-tetrabutyl titanate solution with a volume ratio of 1:1.25 to the particles A, wherein the molar ratio of the particles A to the tetrabutyl titanate is 6:1, stir uniformly, and separate and precipitate to obtain the particles B;

[0045] d) Add the particles B to the solution of lanthanum chloride or lanthanum fluoride, the volume ratio of deionized water: lanthanum chloride or lanthanum fluoride: absolute ethanol is 1:2:6, lanthanum chloride or lanthanum fluoride The weight ratio to the particle B is 1:80, and the mix...

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Abstract

The invention relates to electrorheological fluid of high-dielectric constant CaCu3Ti4O12 hybrid-modified particles and a preparation method thereof. A disperse phase of the electrorheological fluid is hybrid-modified CaCu3Ti4O12 partials with the dielectric constant of more than 10,000, and base fluid is chlorinated paraffin-doped and hydroxyl polar group-modified silicone oil compound base fluid. The preparation method comprises the following steps of: preparing the base fluid, namely mixing according to a ratio of 5 to 20 v percent of chlorinated paraffin, 40 to 80 v percent of chlorinatedsilicon oil and 10 to 50 v percent of dimethyl silicon oil; preparing the CaCu3Ti4O12 partials by using a sol-gel method; performing hybrid modification on the prepared CaCu3Ti4O12 partials to obtainthe CaCu3Ti4O12 compound partials, and adding the compound particles into the base fluid to obtain electrorheological fluid of which the compound particle volume concentration is 10 to 50 percent. Inthe invention, the sol-gel method and the controllable molecular synthesis technology are adopted, so that the constitution and the structure of the particles are optimized, and the electrorheological particles with high shear strength and active base fluid with high electrorheological strength are obtained; and the prepared electrorheological fluid has high shear strength and high comprehensive performance.

Description

Technical field [0001] The invention relates to a novel high-dielectric constant hybrid modified particle electrorheological fluid and a preparation method thereof, in particular to a hybrid and modified CaCu with a dielectric constant greater than 10,000 3 Ti 4 O 12 The electrorheological fluid whose dispersion medium is core particles and its preparation method. Background technique [0002] Electrorheological fluid is a suspension formed by dispersing polarizable particles in a base fluid. Generally, in the research of electrorheological materials, systematic research is started from two aspects of particles and base fluid. Early research on the mechanism of electrorheological effects only considered the effect of dielectric constant on polarization. In recent years, the continuous deepening of research has made people realize that electrorheological effects not only require particles with high dielectric constant, but also require appropriate dielectric loss. And conductivit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M171/00C10M177/00C10N40/14C10M169/04
Inventor 谭锁奎郭红燕纪松赵红吴敏
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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