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Method for preparing stable dispersive type magnetorheological fluid

A magnetorheological fluid and dispersion technology, applied in the direction of magnetic liquid, magnetic materials, magnetic objects, etc., can solve the problems of high particle density, affecting the working performance of magnetorheological fluid, easy to settle, etc., to achieve high shear strength, Superior and stable performance, low cost effect

Active Publication Date: 2017-06-09
山东格新精工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in the process of using the traditional magnetorheological fluid, the magnetic particles are easy to aggregate and flocculate and precipitate, and the particles themselves have a high density and are easy to settle to affect the working performance of the magnetorheological fluid. A method for preparing a stable dispersible magnetorheological fluid with polystyrene acrylic emulsion as the hollow core, coated with a nano-ferric oxide shell, and combined with a polydopamine network structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] First, add 500mL of 50% polyethylene glycol 4000 solution, 300mL of absolute ethanol, 80mL of deionized water, and 5g of potassium persulfate in the three-necked flask in sequence, and then place the three-necked flask in a magnetic stirrer with digital display speed measurement and constant temperature , adjust the temperature to 80°C, and the stirring speed to 800r / min. Under constant temperature stirring, nitrogen gas is introduced into the three-necked flask at a rate of 10mL / min. Under nitrogen protection, 250mL styrene, 60mL Acrylic acid, and then continue to stir and react at a constant temperature for 10 hours to obtain a polystyrene acrylic acid emulsion; weigh 5g of nano-ferric oxide, pour it into a beaker containing 800mL of the polystyrene acrylic emulsion obtained above, and then place the beaker in an ultrasonic oscillator , at a temperature of 50°C and a frequency of 60kHz, ultrasonically disperse for 60 minutes, then dropwise add a 15% sodium hydroxide so...

example 2

[0022]First, add 300mL of 40% polyethylene glycol 4000 solution, 200mL of absolute ethanol, 60mL of deionized water, and 3g of potassium persulfate to the three-necked flask in sequence, and then place the three-necked flask in a magnetic stirrer with digital display speed measurement and constant temperature , adjust the temperature to 75°C, and the stirring speed to 600r / min. Under constant temperature stirring, feed nitrogen into the three-necked flask at a rate of 8mL / min. Under nitrogen protection, add 200mL styrene, 50mL Acrylic acid, and then continue to stir and react at a constant temperature for 8 hours to obtain a polystyrene acrylic acid emulsion; weigh 3g of nano-ferric oxide, pour it into a beaker containing 600mL of the polystyrene acrylic emulsion obtained above, and then place the beaker in an ultrasonic oscillator , at a temperature of 45°C and a frequency of 45 kHz, ultrasonically disperse for 45 minutes, then add dropwise a 10% sodium hydroxide solution to a...

example 3

[0025] First, add 400mL polyethylene glycol 4000 solution with a mass fraction of 45% in the three-necked flask, 250mL absolute ethanol, 70mL deionized water, and 4g potassium persulfate, and then place the three-necked flask in a magnetic stirrer with a digital display speed measurement and constant temperature , adjust the temperature to 77°C, and the stirring speed to 700r / min. Under constant temperature stirring, feed nitrogen into the three-necked flask at a rate of 9mL / min. Under nitrogen protection, add 220mL styrene, 55mL Acrylic acid, and then continue to stir and react at a constant temperature for 9 hours to obtain a polystyrene acrylic acid emulsion; weigh 4g of nano-ferric oxide, pour it into a beaker containing 700mL of the polystyrene acrylic emulsion obtained above, and then place the beaker in an ultrasonic oscillator , at a temperature of 47°C and a frequency of 50kHz, ultrasonically disperse for 47 minutes, then dropwise add a 12% sodium hydroxide solution to...

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Abstract

The invention relates to a method for preparing a stable dispersive type magnetorheological fluid, and belongs to the technical field of preparation. The method includes: using absolute ethyl alcohol and deionized water as a dispersion medium, using a polyethylene glycol 4000 as a stabilizer, using potassium peroxodisulfate as an initiator, and allowing styrene and acrylic acid to polymerize to form emulsion in the nitrogen atmosphere; using nano ferroferric oxide as magnetic particles, and using carboxylic groups on surfaces of poly (styrene-acrylic acid) to absorb the nano ferroferric oxide; dissolving dopamine in water in an alkaline condition to dissolve oxygen, forming a polymer network as a support structure in an emulsion system, and finally performing magnetization in a magnetic field. The prepared stable dispersive type magnetorheological fluid can avoid flocculent precipitate due to aggregation of particles, has excellent stability and dispersibility; the settlement is less than 3% after standing is formed for 24 hours, the settlement is less than 17% after standing is performed for 3 months, and a hardening phenomenon will not occur after the magnetorheological fluid is stored for more than 3 years.

Description

technical field [0001] The invention relates to a preparation method of a stable dispersible magnetorheological fluid, belonging to the technical field of preparation. Background technique [0002] Magneto-rheological fluid is a new type of functional material. It is a suspension prepared with nano- or micron-sized soft magnetic particles as the dispersed phase and oil or water as the dispersion medium. Under the action of an external magnetic field, the magnetorheological fluid can produce an obvious magnetorheological effect. After the soft magnetic particles are magnetized under the magnetic field, they form a chain or columnar structure along the direction of the magnetic field, so that the magnetorheological fluid changes from a Newtonian fluid to a Bingham fluid with a certain shear yield strength, when the magnetic field is removed, the soft magnetic particles demagnetize, and the chain or columnar structure collapses and returns to the original Newtonian fluid state....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44C08G73/06C08F212/08C08F220/06
CPCC08F212/08C08G73/0672H01F1/447C08F220/06
Inventor 戴琪薛洋许丽君
Owner 山东格新精工有限公司
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