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Preparation method for silicone-oil-based magnetic liquid

A technology of magnetic liquid and silicone oil, which is applied in the direction of magnetic liquid, subferrous oxide, iron oxide/iron hydroxide, etc. It can solve the problems of low saturation magnetization of magnetic liquid, inconvenient maintenance, narrow application range of magnetic liquid, etc.

Active Publication Date: 2015-08-26
ZIGONG ZHAOQIANG SEALING PROD IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the above-mentioned existing magnetic liquid has a narrow application range, and the higher the temperature, the lower the saturation magnetization of the magnetic liquid. When sealing a gas or liquid medium with a higher temperature and pressure, the manufacturing cost is high and the maintenance is difficult. Convenience and other issues, providing a method for preparing a silicone oil-based magnetic liquid with high and low temperature resistance and high saturation magnetization, which is suitable for the sealing medium from low temperature to high temperature cycle change

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A, Co-precipitation method to prepare Fe 3 o 4 magnetic particle

[0062] Prepare FeCl with a concentration of 0.25mol / L 2 and FeCl 3 solution, Fe 3+ and Fe 2+ The molar ratio of the two solutions is 1.65:1. Mix the two solutions evenly in a digital constant temperature water bath at 60°C, put them into a three-necked flask, quickly add NaOH (25%) (precipitating agent) solution to excess, and adjust the pH to 11 , into Ar 2 Make a protective gas, and stir mechanically quickly. After the reaction, take out the product and wash the black slurry with distilled water to remove the soluble salt on the surface, adjust the pH to neutral, and use a high-speed centrifuge to separate and remove most of the water. Put the black slurry into a vacuum drying oven and dry it at 60°C for 10 hours to obtain solid Fe 3 o 4 For magnetic particles, by comparing their physical and chemical properties, iron oxide crystals with a particle size of 9.5nm and a saturation magnetic streng...

Embodiment 2

[0068] A, Co-precipitation method to prepare Fe 3 o 4 magnetic particle

[0069] Prepare FeCl with a concentration of 0.25mol / L 2 and FeCl 3 solution, Fe 3+ and Fe 2+The molar ratio of the two solutions is 1.75:1. Mix the two solutions evenly in a digital constant temperature water bath at 60°C, put them into a three-necked flask, quickly add NaOH (25%) (precipitating agent) solution to excess, and adjust the pH to 11 , into Ar 2 Make a protective gas, and stir mechanically quickly. After the reaction, take out the product and wash the black slurry with distilled water to remove the soluble salt on the surface, adjust the pH to neutral, and use a high-speed centrifuge to separate and remove most of the water. Put the black slurry into a vacuum drying oven and dry at 60°C for 9 hours to obtain solid Fe 3 o 4 For magnetic particles, by comparing their physical and chemical properties, iron oxide crystals with a particle size of 9.7nm and a saturation magnetic strength of...

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Abstract

The invention discloses a preparation method for silicone-oil-based magnetic liquid. The preparation method for the silicone-oil-based magnetic liquid is mainly characterized in that 1, Fe3O4 is prepared with a coprecipitation method, and through comparison of physicochemical properties of Fe3O4, a ferric oxide crystal with good crystal morphology and magnetic performance is used for following decoration; 2, the surface of the ferric oxide crystal is coated with a SiO2 shell through a Stober method; 3, ferrite nanoparticles of a shell-core structure are obtained through the Fe3O4 magnetic particles covered by SiO2 and spread in silicone oil base liquid, and then the silicone-oil-based magnetic liquid is obtained. The obtained magnetic liquid can resist to high temperature and is high in saturation magnetization intensity, good in seal performance, high in pressure resisting capacity and long in sealing life.

Description

technical field [0001] The invention relates to the field of sealing media, in particular to a method for preparing a silicone oil-based magnetic liquid with high temperature resistance and high saturation magnetization. Background technique [0002] Magnetic liquid is a uniform and stable colloidal solution formed by dispersing nano-magnetic particles in base liquid, so it has both magnetism and fluidity, and it has special physical, chemical and fluid properties. [0003] Commonly used magnetic materials are divided into ferrite system, metal system and iron nitride system. Among them, ferrite has better oxidation resistance than metal and iron nitride. The most commonly used magnetic particle is Fe 3 o 4 magnetic particles. [0004] However, the existing magnetic liquid has a narrow temperature range, generally -40°C to 150°C, and the higher the temperature, the lower the saturation magnetization of the magnetic liquid. When sealing a gas or liquid medium with a highe...

Claims

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Application Information

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IPC IPC(8): H01F1/44C01G49/08
Inventor 罗小松颜招强谭健
Owner ZIGONG ZHAOQIANG SEALING PROD IND
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