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A novel magnetic sealing material and its preparation method

A sealing material and magnetic technology, applied in the direction of magnetic materials, magnetic objects, magnetic liquids, etc., can solve the problems of poor stability, the magnetic sealing parts cannot meet the sealing requirements, settlement and other problems, and achieve good stability and good magnetic sealing effect. Effect

Inactive Publication Date: 2020-08-25
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the fluorocarbon chains in fluoroether oil have the characteristics of hydrophobic and oleophobic "biphobic", it is difficult for traditional surfactants to disperse magnetic particles into fluoroether
Although fluorocarbon surfactants can help disperse magnetic particles in fluoroether oil, the stability of magnetic fluids in high temperature environments becomes extremely poor due to the interaction between magnetic materials and fluorocarbon surfactants, eventually resulting in magnetic particles The phenomenon of agglomeration and settlement occurs, which makes the magnetic sealing parts unable to meet the sealing requirements

Method used

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  • A novel magnetic sealing material and its preparation method
  • A novel magnetic sealing material and its preparation method
  • A novel magnetic sealing material and its preparation method

Examples

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Effect test

Embodiment 1

[0025] Silica-coated perfluorooctanoic acid-grafted Fe3O4 magnetic nanoparticles. Take 27.8g ferrous sulfate heptahydrate and 3.99g ferric chloride to prepare 50mL solution, then add 200mL ammonia solution (100mL concentrated ammonia water and 100mL deionized water), and mechanically stir at 300rpm for 2h. The mixture is then transferred to a beaker, and the beaker is placed above the magnet, so that the ferroferric oxide magnetic nanoparticles are quickly precipitated to the bottom of the beaker, the water and impurities in the upper part are poured off, and the deionized water is used to clean 2-3 times to obtain High-purity ferroferric oxide magnetic nanoparticles; disperse the ferroferric oxide magnetic nanoparticles into a mixed solution formed by 100mL ethanol and 200mL deionized water, stir at 50°C at a rate of 300rpm for 15min and then at 50°C Add 30mL of concentrated ammonia water, add 20g of tetraethyl orthosilicate after another 20min, add 0.5g of aminopropyltrimeth...

Embodiment 2

[0027]Silica-coated perfluorohexanoic acid-grafted ferroferric oxide magnetic nanoparticles. Take 27.8g ferrous sulfate heptahydrate and 3.99g ferric chloride to prepare 50mL solution, then add 200mL ammonia solution (100mL concentrated ammonia water and 100mL deionized water), and mechanically stir at 300rpm for 2h. Then transfer the mixture to a beaker, and place the beaker above the magnet, so that the magnetic ferroferric oxide quickly settles to the bottom of the beaker, pour off the upper water and impurities, and use deionized water to wash 2-3 times to obtain high purity Fe3O4 nanoparticles. Disperse the ferroferric oxide magnetic nanoparticles into the mixed solution formed by 100mL ethanol and 200mL deionized water, add 30mL concentrated ammonia water after stirring at a rate of 300rpm for 15min, add 20g tetraethyl orthosilicate after another 20min, and react After 1 hour, add 0.5 g of aminopropyltrimethoxysilane to the system, keep the stirring rate and reaction te...

Embodiment 3

[0029] Silica-coated ferric oxide magnetic nanoparticles grafted with fluoroether acid. Take 27.8g ferrous sulfate heptahydrate and 3.99g ferric chloride to prepare 50mL solution, then add 200mL ammonia solution (100mL concentrated ammonia water and 100mL deionized water), and mechanically stir at 300rpm for 2h. Then transfer the mixture to a beaker, and place the beaker above the magnet, so that the magnetic ferroferric oxide quickly settles to the bottom of the beaker, pour off the upper water and impurities, and use deionized water to wash 2-3 times to obtain high purity Fe3O4 magnetic nanoparticles. Disperse the ferroferric oxide magnetic nanoparticles into a mixed solution formed by 100mL ethanol and 200mL deionized water, stir at 50°C at a rate of 300rpm for 15min, add 30mL of concentrated ammonia water, and add 20g of orthosilicate tetrachloride after another 20min. Ethyl ester, after reacting for 1 hour, add 0.5 g of aminopropyltrimethoxysilane to the system, keep the...

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Abstract

The invention discloses a novel magnetic sealing material, which is formed by nucleus-shell-grafting group particles. The nucleus is ferromagnetic nanoparticles with the particle size being 5 to 100nm; the shell is an inert metal oxide layer or a resin layer covering the surface of the nucleus; hydroxide radical, carboxyl, amidogen or hydrosulphonyl on the shell can be chemically grafted with groups; the thickness of the shell is 1 to 100nm; the grafting group is a fluorocarbon chain grafted on the inert metal oxide layer or the resin layer; the cover degree of the fluorocarbon chain on the shell surface is 5 to 95 percent. The invention provides the novel magnetic sealing material used as magnetic particles in magnetic fluid, so that the magnetic particles can be directly, stably and uniformly dispersed into carrier liquid, and cannot be settled or agglomerated, and the magnetic sealing effect of the magnetic fluid is better.

Description

technical field [0001] The invention belongs to magnetic sealing materials, in particular to a novel magnetic sealing material and a preparation method thereof. Background technique [0002] Magnetic sealing is a new type of sealing technology. The magnetic sealing parts prepared by this technology can not only withstand high and low temperature, have no wear, and have excellent working reliability, even in the ultimate vacuum degree of 10 -6 The leakage rate under Pa is also extremely low. Because of its excellent performance, it is widely used in many fields such as chemical industry, machinery and energy. The magnetic fluid in the magnetic sealing parts is a key factor affecting the sealing effect. [0003] Magnetic fluid is composed of magnetic particles, carrier liquid and dispersant; since the sealing parts need to meet the actual needs of high temperature and high pressure, the carrier liquid needs to have low viscosity and low saturated vapor pressure, and has a hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/10H01F1/44
CPCC09K3/10C09K2003/1034H01F1/445
Inventor 邹伟陈炯颜杰李嘉杨虎朱胜兰苏桂萍何冬梅
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING