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Synthetic oil-base magnetic poly-alpha olefin liquid and its preparation

A technology of magnetic liquid and α-olefin, which is applied in the field of nanometers to achieve the effect of high saturation magnetization, simple preparation method and good thermal stability

Inactive Publication Date: 2009-06-24
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no report on polyalphaolefin synthetic oil-based magnetic fluid in China

Method used

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  • Synthetic oil-base magnetic poly-alpha olefin liquid and its preparation
  • Synthetic oil-base magnetic poly-alpha olefin liquid and its preparation
  • Synthetic oil-base magnetic poly-alpha olefin liquid and its preparation

Examples

Experimental program
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Effect test

Embodiment 1

[0034] 1. Preparation and washing of magnetic nanoparticles:

[0035] 108g FeCl 3 ·6H 2 O dissolved in 400ml distilled water; 40g FeCl 2 4H 2 O was dissolved in 400 ml of distilled water; the two salt solutions were mixed. Add the iron salt mixed solution to 150ml stirring NH 4 OH solution, black nano-magnetic particles are generated. NH 4 NH in OH solution 3 The mass percentage is 25%; the stirring speed of the mechanical stirrer is set at 400r / min. The reactant was heated in a water bath for 55 minutes under stirring, and the temperature of the water bath was 70°C. Wash the synthesized magnetic particles several times with 1500ml distillation each time until the conductivity σ≤100μs / cm of the washing solution.

[0036] 2. Configure surfactant aqueous solution:

[0037] Dissolve 20.24g of BASF's Korantin SH (oleoyl sarcosine) in 400ml of distilled water, then add 30ml of NH 3 25% NH by mass 4 OH solution, 85 ℃ water bath heating Korantin SH dissolved in water to f...

Embodiment 2

[0046] Prepare and wash magnetic nanoparticles:

[0047] 108g FeCl 3 ·6H 2 O dissolved in 400ml distilled water; 40g FeCl 2 4H 2 O was dissolved in 400 ml distilled water; the two iron salt solutions were mixed. Add the iron salt mixed solution to 200ml of stirring NH 4 OH solution, black nano-magnetic particles are generated. NH 4 NH in OH solution 3 The mass percentage is 25%; the stirring speed of the mechanical stirrer is set at 400r / min. The reactant was heated in a water bath for 20 minutes under stirring, and the temperature of the water bath was 60°C. Wash the synthesized magnetic particles several times with 1500ml distillation each time until the conductivity σ≤100μs / cm of the washing solution. Wash the above-mentioned magnetic particles 3 times with 100ml alcohol.

[0048] Surface modification of magnetic nanoparticles and synthesis of magnetic liquids:

[0049] A mixture of 200ml PAO and 20g Korantin SH was added. 200r / min mechanical stirring, set 98 ℃ ...

Embodiment 3

[0051] Embodiment 3 prepares the technique of magnetic liquid and embodiment 2 is substantially the same, and difference is: the amount of the PAO that embodiment 3 is used is 90ml, and the amount of the PAO that embodiment 2 is used is 200ml.

[0052] The saturation magnetization of the sample prepared in Example 3 is 28.8emu / g (446Gs); the viscosity at 27°C is 68.9mPa.s; the density is 1.24g / cm 3 .

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Abstract

The invention relates to the field of nanotechnology, and discloses a polyalphaolefin synthetic oil-based magnetic liquid and a preparation method thereof. The magnetic liquid includes surfactants, Fe3O4 nanoparticles and polyalphaolefin synthetic oil, the surfactant is R1CON(CH3)CH2COOH, R1 is an alkane or olefin group with 17 to 40 carbon atoms, and the polyalphaolefin The synthetic oil is H3CH(R2)-(CH2CH(R2))n-CH2CH2R2, n=2-5; R2 is an alkane group with 6-10 carbon atoms. The polyalphaolefin synthetic oil-based magnetic liquid of the invention is uniform and stable, has good thermal stability, high saturation magnetization, adjustable saturation magnetization, simple preparation method and low cost.

Description

technical field [0001] The invention relates to the field of nanotechnology, in particular to a polyalphaolefin synthetic oil-based magnetic liquid and a preparation method thereof. Background technique [0002] The magnetic liquid is a uniform and stable colloid formed by nano-magnetic particles wrapped in a surfactant in a carrier liquid. Oil-based magnetic liquid is mainly used in: vacuum rotary seal, speaker heat dissipation, magnetic liquid grinding, damping shock absorption and lubrication and other fields. Oil-based magnetic liquids are divided into ester-based magnetic liquids, kerosene-based magnetic liquids, silicone oil-based magnetic liquids, fluoroether oil-based magnetic liquids, etc. The thermal stability and saturation magnetization of ester-based magnetic liquids are not ideal. There is no report about polyalphaolefin synthetic oil-based magnetic fluid in China. Contents of the invention [0003] The purpose of the present invention is to provide a poly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/00C08K3/22C08K5/16C10M125/10C10N40/34C10N40/14C09K3/14
Inventor 沈辉黄向阳徐雪青
Owner SUN YAT SEN UNIV
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