Stable magnetic rheological liquid and its preparation method

A magnetorheological fluid, stable technology, used in the petroleum industry, additives, lubricating compositions, etc., can solve the problems of zero-field viscosity increase, specific gravity difference, wear and other problems, improve stability and temperature stability, improve magnetic properties. The effect of rheological properties, good overall performance

Inactive Publication Date: 2005-12-07
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to overcome the sedimentation and agglomeration problems caused by the large specific gravity difference between the suspended particles and the medium, people use many surfactants or suspending agents to treat the surface of the suspended particles with amphiphilicity, usually metal soaps and stearic acids Active agents, etc., but the addition of these organic active agents often affects the temperature stability of magnetorheological fluids
In addition to problems such as sedimentation and compaction, another problem that limits the application of magnetorheological fluids is the problem of wear between high-speed moving parts. The consequence of this wear is that the obvious thickening of the magnetorheological fluid itself leads to a sharp increase in zero-field viscosity, and in addition causes damage to moving parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] Take 228g of reduced or phosphide carbonyl iron powder (particle size range 1-30μm), 70ml of isopropanol, and 5ml of silane coupling agent into a 300ml volume stainless steel grinding jar, after mechanical stirring and ultrasonic dispersion, perform ball milling for 6-8h, The rotational speed of the spherical tank is not less than 125m / min. Then bake in a vacuum oven at 70-80°C for 5-6 hours. After the pretreatment carrier liquid is volatilized, weigh 75ml of 100# silicone oil and 1.5g of nano-scale silicon oxide thixotropic agent, mix them into the spherical tank, and stir them mechanically. After ultrasonic dispersion, carry out secondary ball milling dispersion, the line speed of the milling tank is not less than 125m / min., and the ball milling time is not less than 12h. Separate the magnetorheological fluid from the balls and store them in airtight, light-shielding polyvinyl chloride bottles. The room temperature zero-field viscosity of the magnetorheological fluid...

example 2

[0023] Suspended phase powder, proportioning and pretreatment are the same as in Example 1. After pretreatment and drying, weigh 75ml of mineral oil and 1.5g of nano-scale silicon oxide thixotropic agent, mix them into a ball mill tank, and carry out secondary grinding after mechanical stirring and ultrasonic dispersion. Ball milling dispersion, the process is the same as the secondary ball milling dispersion process in Example 1. The zero-field viscosity of the sample at room temperature is 0.6Pa·s (D=10 / s), and the shear stress under a 5000Gs magnetic field is 60kPa. Evenly dispersed under the action of down or shearing.

example 3

[0025] Suspended phase powder, proportioning same as example 2, pretreatment process adopts carboxylic acid organic amine salt surfactant (proportioning is 0.8% vol). In the secondary dispersion, 0.1 g of nano-scale bentonite thixotropic agent is used, and the proportion and process are the same as in Example 2. The zero-field viscosity of the sample is 0.6Pa·s (D=10 / s), and the shear stress under the magnetic field of 5000Gs is 58kPa, and the formed soft sedimentation is easy to redisperse.

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PUM

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Abstract

A high-stability magnetic rheopectic liquid is prepared from the magnetic suspended phase including reduced and phosphonated carbonyl iron powder, liquir carrier, nano-class inorganic bentonite or silica oxide-type thixotropic agent and surfactant through cleaning the surface of suspended particles, activating and synthesizing the magnetic rheopectic liquid. Its advantages are high stability without deposition, better antiwear nature, zero field viscosity and ideal rheopectic characteristics.

Description

technical field [0001] The invention belongs to the technical field of magnetic fluids, and in particular relates to a stable magnetorheological fluid and a preparation method thereof. Background technique [0002] Magnetorheological fluid is a dispersion material whose apparent viscosity changes significantly under the action of an external magnetic field. It is mainly used in the development of various controllable damping systems, such as dampers, shock absorbers, elastic devices, etc. . It is also used for pressure or torque control in brakes, clutches, and valves. In many application fields, magnetorheological fluid has obvious advantages compared with electrorheological fluid. It has a high yield strength and can create greater damping force. Magnetorheological fluids are different from colloidal magnetic fluids. The diameter of the suspended phase of the latter is generally 5-10nm. It is difficult to form a chain structure under the action of an external magnetic fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M125/04
Inventor 张平刘奇王东亚
Owner CHONGQING MATERIALS RES INST
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