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Method for preparing alkali-resistant magnetic liquid sealing material

A magnetic liquid and sealing material technology, applied in chemical instruments and methods, and other chemical processes, can solve problems such as sealing failure, increased leakage, and enlarged sealing gap, and achieve good sealing performance, long sealing life, and extended sealing life Effect

Inactive Publication Date: 2012-01-25
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that because the sealing part is in hard contact, during the movement, due to mechanical wear, the sealing gap will gradually become larger, and the leakage will gradually increase, which will eventually lead to sealing failure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Using iron-nickel alloy rods with a purity of 99.6wt% and a nickel content of 70wt% as raw materials, the total pressure is 5.0×10 4 Pa, acetylene gas pressure ratio is 30% in the mixed atmosphere of acetylene gas and argon gas prepared by arc method, the nanoparticles produced in the preparation room are collected as the mixed gas enters the oleic acid liquid, and the obtained iron-nickel alloy nanoparticles The average particle size is 22 nm.

[0009] The mass composition of the alkali-resistant magnetic liquid sealing material is: 30% of iron-nickel alloy nanoparticles, 55% of perfluoropolyether oil, and 15% of silicone oil. The preparation method is: (1) weighed according to the composition ratio of the alkali-resistant magnetic liquid sealing material Take iron-nickel alloy nanoparticles, perfluoropolyether oil, and silicone oil; (2) put the weighed perfluoropolyether oil and silicone oil into a high-pressure reactor, and stir at a pressure of 1MPa and a temperatur...

Embodiment 2

[0011] Using iron-nickel alloy rods with a purity of 99.6wt% and a nickel content of 50wt% as raw materials, the total pressure is 7.0×10 4 Pa, acetylene gas pressure ratio is 30% in the mixed atmosphere of acetylene gas and argon gas prepared by arc method, the nanoparticles produced in the preparation room are collected as the mixed gas enters the oleic acid liquid, and the obtained iron-nickel alloy nanoparticles The average particle size is 45 nm.

[0012] The mass composition of the alkali-resistant magnetic liquid sealing material is: 40% of iron-nickel alloy nanoparticles, 50% of perfluoropolyether oil, and 10% of silicone oil. The preparation method is: (1) weighed according to the composition ratio of the alkali-resistant magnetic liquid sealing material Take iron-nickel alloy nanoparticles, perfluoropolyether oil, and silicone oil; (2) put the weighed perfluoropolyether oil and silicone oil into a high-pressure reactor, and stir at a pressure of 1MPa and a temperatur...

Embodiment 3

[0014] Using iron-nickel alloy rods with a purity of 99.6wt% and a nickel content of 25wt% as raw materials, under a total pressure of 1.0×10 5 Pa, acetylene gas pressure ratio is 30% in the mixed atmosphere of acetylene gas and argon gas prepared by arc method, the nanoparticles produced in the preparation room are collected as the mixed gas enters the oleic acid liquid, and the obtained iron-nickel alloy nanoparticles The average particle size is 60 nm.

[0015] The mass composition of the alkali-resistant magnetic liquid sealing material is: 50% of iron-nickel alloy nanoparticles, 40% of perfluoropolyether oil, and 10% of silicone oil. The preparation method is: (1) weighed according to the composition ratio of the alkali-resistant magnetic liquid sealing material Take iron-nickel alloy nanoparticles, perfluoropolyether oil, and silicone oil; (2) put the weighed perfluoropolyether oil and silicone oil into a high-pressure reactor, and stir at a pressure of 1MPa and a temper...

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Abstract

The invention provides a method for preparing an alkali-resistant magnetic liquid sealing material, having the following principal technical characteristics: 1, iron-nickel alloy nano-particles are prepared by a liquid-phase collection method; 2, the method for preparing the alkali-resistant magnetic liquid sealing material comprises the steps of: (1) weighting the iron-nickel alloy nano-particles, perfluoro polyether oil and silicone oil based on formula proportions; (2) putting the weighted perfluoro polyether oil and the silicone oil into a high-pressure reaction kettle for agitating for 90 minutes under the pressure of 1 MPa and at the temperature of 100 DEG C; (3) increasing the pressure in the high-pressure reaction kettle to 2 MPa, raising the temperature to 150 DEG C, and then agitating for 120 minutes; and (4) once the pressure and the temperature in the high-pressure reaction kettle return to normal pressure and room temperature, putting the iron-nickel alloy nano-particles into the high-pressure reaction kettle for agitating for 180 minutes under the pressure of 0.5 MPa and at the temperature of 60 DEG C. The invention has the advantages of no hard contact at sealing parts, no mechanical abrasion, good sealing property and long sealing lifetime.

Description

Technical field: [0001] The invention relates to the field of sealing materials, in particular to a method for preparing an alkali-resistant magnetic liquid sealing material used for sealing alkali medium. Background technique: [0002] At present, the sealing materials used in alkali medium sealing at home and abroad are mostly carbon-graphite sealing rings, silicon nitride sealing rings, aluminum oxide sealing rings, cermet sealing rings and polytetrafluoroethylene sealing rings. Its disadvantage is that because the sealing part is in hard contact, during the movement, due to mechanical wear, the sealing gap will gradually become larger, and the leakage will gradually increase, which will eventually lead to sealing failure. When using the alkali-resistant magnetic liquid sealing material, since the magnetic liquid seal is a soft seal, there is no hard contact at the sealing part, and there is no mechanical wear, so the sealing performance is good, the sealing life is long,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/10
Inventor 孙维民
Owner SHENYANG POLYTECHNIC UNIV