Dielectric particle for giant electrorheological fluid and preparation method of dielectric particle

Abstract

The invention discloses a dielectric particle for giant electrorheological fluid and a preparation method of the dielectric particle. The dielectric particle is a nanometer core-shell structure composite material, wherein doped titanium dioxide is taken as a core, and the surface of the core is coated with a polar polymer; and doped titanium dioxide is prepared by doping high-dielectric-constant organic matters in a preparation process of titanium dioxide; and the dielectric particle contains the following components in percentage by weight: 80%-90% of titanium dioxide, 5%-10% of the high-dielectric-constant organic matters and 5%-10% of the polar polymer. The preparation method comprises the following steps: (1) adding the high-dielectric-constant organic matters in the preparation process of titanium dioxide, so as to prepare doped titanium dioxide; and (2) adding the polar polymer into doped titanium dioxide by virtue of an in-situ polymerization method, so as to obtain the dielectric particle for the giant electrorheological fluid. The dielectric particle disclosed by the invention has the characteristics that the dielectric constant is relatively high, the anti-settling property is good, the particle size is nano-scale, the pollution is avoided, and the like; and when being applied to the giant electrorheological fluid, the dielectric particle has the advantages that the electrorheological effect is good, the dielectric particle has good high-low temperature resistance and does not settle after being placed for a long time, and the like.

Description

technical field [0001] The invention relates to a dielectric particle for giant electrorheological fluid and a preparation method thereof, belonging to the technical field of new materials. Background technique [0002] Giant electrorheological fluid (GRF) is a type of colloid in which dielectric particles are evenly suspended in a non-conductive continuous phase. When an electric field of a certain intensity is applied to GRF, its rheological properties will change immediately, from liquid to like The solid state, when the electric field is removed, immediately returns to the original liquid. In the electric field, giant electrorheological fluids have the following characteristics: (1) Rapid conversion between liquid and solid-like, that is, the apparent viscosity can change greatly at static or low shear rates, and the shear resistance with solid properties (2) The conversion between liquid and solid is reversible; (3) The conversion between liquid and solid is controllab...

AI Technical Summary

Problems solved by technology

When inorganic substances are used as dielectric particles, the dielectric constant is high, but there are defects such as high density, poor particle suspension stability, and hard texture, which will cause greater wear and tear on electrorheological devices, and the shear strength still needs to be further improved.

When organic polymers are used as dielectric particles, high shear strength can be achieved, but there are disadvantages such as large leakage current density under high voltage, poor high and low temperature stability, and serious environmental pollution.

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