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A kind of preparation method of magnetic fluid for sealing with high resistance to magnetic sedimentation under strong magnetic field

A magnetic fluid and sedimentation technology, applied in the direction of magnetic objects, magnetic liquids, magnetic materials, etc., can solve the problem of low anti-magnetic sedimentation of magnetic fluids, achieve a strong chemical bond system, reduce interaction, and solve anti-magnetic sedimentation Effect

Active Publication Date: 2021-05-14
HEILONGJIANG HEIKE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the technical problem of low magnetic sedimentation resistance of existing magnetic fluids, and provides a preparation method of magnetic fluids with high magnetic sedimentation resistance sealing under strong magnetic field conditions

Method used

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  • A kind of preparation method of magnetic fluid for sealing with high resistance to magnetic sedimentation under strong magnetic field
  • A kind of preparation method of magnetic fluid for sealing with high resistance to magnetic sedimentation under strong magnetic field
  • A kind of preparation method of magnetic fluid for sealing with high resistance to magnetic sedimentation under strong magnetic field

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specific Embodiment approach 1

[0043] Embodiment 1: The preparation method of the magnetic fluid for sealing with high resistance to magnetic sedimentation under the condition of strong magnetic field of this embodiment is carried out according to the following steps:

[0044] 1. Preparation of Fe with a particle size of 5 to 20 nanometers 3 o 4 Magnetic powder:

[0045] 2. Weighing nano-Fe 3 o 4 powder, first antioxidant, first dispersant, second antioxidant, second dispersant, metal deactivator, viscosity modifier and synthetic hydrocarbon base oil;

[0046] Among them, the first antioxidant is barium petroleum sulfonate, dodecenylsuccinic acid, 4,4'-dioctyl diphenylamine, dodecenylsuccinic acid, zinc diisooctyl dithiophosphate or high Alkali sulfurized calcium alkylphenate;

[0047] The first dispersant is: polyisobutylene monosuccinimide, non(octyl) phenol polyoxyethylene ether, diphenyl p-isooctyl phosphate, fatty alcohol polyoxyethylene ether sodium sulfate, ash-free polyisobutenyl Succinimide o...

specific Embodiment approach 2

[0055] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step one, the particle size is 5-20 nanometers of Fe 3 o 4 The preparation method of magnetic powder is as follows:

[0056] (1) Nitrogen gas is passed into the NaOH aqueous solution of 25%~30% by mass percent to carry out oxygen removal and continues to pass into nitrogen gas to form a protective atmosphere, and the FeCl 2 with FeCl 3 The mixed aqueous solution is added dropwise to the NaOH aqueous solution. After the dropwise addition, the temperature is raised to 60-85°C, and the surfactant is added dropwise. After the surfactant is added dropwise, the reaction is stirred at 80-85°C for 20-40 minutes , during the reaction process, continuously feed nitrogen to carry out atmosphere protection to obtain a suspension;

[0057] where FeCl 2 with FeCl 3 FeCl in the mixed aqueous solution 2 with FeCl 3 The mass ratio is 1:(1.5~2.5);

[0058] FeCl 2 with FeCl 3 I...

specific Embodiment approach 3

[0062] Specific embodiment three: the difference between this embodiment and specific embodiment two is that the surfactant described in step (1) is oleic acid, (Z)-9-octadecenoic acid sodium, ethoxylated alkyl fat Alcohol polyoxyethylene ether, sodium dodecylbenzene sulfonate (DBSA), sodium tetrapropylene benzene sulfonate and barium methylene dinaphthalene sulfonate or a combination of several; other and specific Embodiment 2 is the same.

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Abstract

The invention relates to a preparation method of a magnetic fluid for sealing with high anti-magnetic sedimentation under strong magnetic field conditions, which relates to a preparation method of the magnetic fluid. It aims to solve the technical problem of low magnetic sedimentation resistance under high magnetic field of the existing magnetic fluid. This method: first prepare Fe with a particle size of 5-15 nanometers 3 o 4 powder; then uniformly disperse it in cyclohexane, add antioxidant and dispersant to carry out surface modification and coating for the first time; then use bipolar liquid phase transfer method to surface modify and coat Nano-Fe 3 o 4 Transfer to heptane, then add antioxidant and dispersant to carry out secondary surface modification and coating, and then add metal deactivator and viscosity modifier to synthetic hydrocarbon base oil to react to obtain magnetic fluid. The saturation magnetization of the magnetic fluid used is 498-570GS, and the anti-magnetic sinking test under the condition of a 1.0T magnetic field at room temperature has no separation phenomenon for more than 720 hours. It can be used in the fields of vacuum sealing and damping and shock absorption.

Description

technical field [0001] The invention relates to a preparation method of magnetic fluid. [0002] technical background [0003] Magnetic fluid is a magnetic, flowable non-Newtonian fluid functional material. It uses nanoparticle surface modification and activation technology to uniformly disperse nanoscale ferrite particles in organic or inorganic liquids to form a uniform and stable non-Newtonian fluid. Newtonian fluid-sol system. Magnetic fluid not only has surface effect, small size effect, macroscopic quantum tunneling effect and volume effect, but also has superparamagnetism and high magnetic susceptibility. The research and application of ferrofluid has expanded from the original field of chemical materials to many fields such as medicine, biochemistry, microelectronics, automatic control, optics, etc., forming a situation of interdisciplinary cooperation and common development, and its new properties and performances are still in progress. Be opened up. [0004] At p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/44H01F41/02
CPCH01F1/445H01F41/02
Inventor 黄波布和巴特尔李鹏张晓臣那宏壮隋新
Owner HEILONGJIANG HEIKE TECH CO LTD
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