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Preparation of magnetic fluid for ultra-high vacuum sealing device

A sealing device, ultra-high vacuum technology, applied in the fields of magnetic liquids, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of low evaporation rate, difficulty, low viscosity, etc., and achieve uniform dispersion, uniform diameter, and low saturated vapor pressure. Effect

Active Publication Date: 2009-03-18
浙江微磁精密技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regarding the choice of carrier liquid, it is generally based on low evaporation rate, low viscosity, high chemical stability, high temperature resistance and radiation resistance, but it is very difficult to meet the above conditions at the same time
It is more difficult for the surfactant to be able to adapt to both the properties of the carrier liquid and the interface requirements of certain magnetic particles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of modified polyoxyethylene ether:

[0023] Alkylphenol ethoxylate C 8 h 17 -C 6 h 4 -O-(CH 2 CH 2 O) 4 H and stearic acid, according to the weight ratio of 24:1, carry out the esterification reaction at 140°C for 4 hours to prepare the modified polyoxyethylene ether.

[0024] A method for preparing a magnetic fluid for an ultra-high vacuum sealing device, characterized in that the following steps are adopted:

[0025] A), the Fe 2+ Soluble salts and Fe 3+ The soluble salts of each are formulated into an aqueous solution of a certain concentration; according to Fe 2+ and Fe 3+The molar ratio of the solution is 1:2, measure the above solutions and mix them;

[0026] B), the resulting mixed solution is placed in an 80°C constant temperature water bath, and excess ammonia water is added while stirring to generate Fe 3 o 4 Particles; after stirring for 20 minutes, drop oleic acid, oleic acid and Fe generated in the mixed solution 3 o 4 The molar r...

Embodiment 2

[0030] A method for preparing a magnetic fluid for an ultra-high vacuum sealing device, characterized in that the following steps are adopted:

[0031] A), the Fe 2+ Soluble salts and Fe 3+ The soluble salts of each are formulated into an aqueous solution of a certain concentration; according to Fe 2+ and Fe 3+ The molar ratio of the solution is 1:2, measure the above solutions and mix them;

[0032] B), the resulting mixed solution is placed in an 80°C constant temperature water bath, and excess ammonia water is added while stirring to generate Fe 3 o 4 Particles; after stirring for 10 minutes, drop oleic acid, oleic acid and Fe generated in the mixed solution 3 o 4 The molar ratio of the solution was 0.16:1, and after stirring for 20 minutes, the black precipitate was filtered; the above black precipitate was washed with distilled water and absolute ethanol in turn, filtered, and dried to obtain magnetic nano-Fe coated with oleic acid. 3 o 4 particles;

[0033] C), ...

Embodiment 3

[0036] A method for preparing a magnetic fluid for an ultra-high vacuum sealing device, characterized in that the following steps are adopted:

[0037] A), the Fe 2+ Soluble salts and Fe 3+ The soluble salts of each are formulated into an aqueous solution of a certain concentration; according to Fe 2+ and Fe 3+ The molar ratio of the solution is 1:2, measure the above solutions and mix them;

[0038] B), the resulting mixed solution is placed in an 80°C constant temperature water bath, and excess ammonia water is added while stirring to generate Fe 3 o 4 Particles; after stirring for 15 minutes, drop oleic acid, oleic acid and Fe generated in the mixed solution 3 o 4 The molar ratio of the solution was 0.14:1. After continuing to stir for 25 minutes, the black precipitate was filtered; the above black precipitate was washed with distilled water and absolute ethanol in turn, filtered, and dried to obtain magnetic nano-Fe coated with oleic acid. 3 o 4 particles;

[0039...

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Abstract

The invention relates to a method for preparing magnetic fluid for a ultrahigh vacuum sealing device, which uses the following steps: A) Fe2+ soluble salt and aqueous solution of Fe3+ soluble salt are mixed according to the molar ratio of Fe2+ and Fe3+, which is 1:2. B) obtained mixed solution is placed in 80 DEG C constant temperature water bath, excessive ammonia is added to generate Fe3O4 particles, oleic acid is added, thereby obtaining magnetic nano Fe3O4 particles which are coated with the oleic acid. C) the magnetic nano Fe3O4 particles which are coated with the oleic acid are dispersed in dioctyl sebacate and is placed in 100 DEG C constant temperature water bath, modified polyoxyethylene ether is added after being stirred for 30min, the temperature is increased to 150 DEG C, emulsification pretreatment is done for 60min, the temperature is reduced below 60 DEG C, thereby obtaining the magnetic fluid for the ultrahigh vacuum sealing device. The method for preparing the magnetic fluid for the ultrahigh vacuum sealing device has lower requirements for experiment instruments and operation conditions, the prepared magnetic fluid is very steady, the saturated vapor pressure is very low, and the startup torque is also low.

Description

technical field [0001] The invention relates to the technical field of sealing, in particular to a method for preparing magnetic fluid used in ultra-high vacuum sealing devices. Background technique [0002] Magnetic fluid, also known as magnetic fluid or magnetic colloid, is a colloidal material with superparamagnetic properties. It has both the magnetism of solid magnetic materials and the fluidity of liquids. [0003] It is a stable colloidal solution formed by highly uniformly dispersing nano-magnetic particles in the carrier liquid with the help of surfactants. It does not coagulate or precipitate under the action of gravity, centrifugal force and magnetic field force. It has appeared in recent years. A new type of functional material. [0004] The magnetic fluid mainly has the following characteristics: (1) Magnetic properties: that is, the superparamagnetism of the magnetic fluid. The magnetization of ferrofluid increases with the increase of magnetic field strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44C01G49/00
Inventor 楼允洪
Owner 浙江微磁精密技术股份有限公司
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