CN101407634B - Preparation of silicon oil-based carbonaceous nano-tube nano-fluid - Google Patents
Preparation of silicon oil-based carbonaceous nano-tube nano-fluid Download PDFInfo
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- CN101407634B CN101407634B CN2008100429825A CN200810042982A CN101407634B CN 101407634 B CN101407634 B CN 101407634B CN 2008100429825 A CN2008100429825 A CN 2008100429825A CN 200810042982 A CN200810042982 A CN 200810042982A CN 101407634 B CN101407634 B CN 101407634B
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Abstract
The invention relates to a preparation method of silicon oil base nano fluid body containing carbon nano tube. The preparation method is characterized in that the nano fluid body consists of carbon nano tube which functionalizes the surface thereof and is ball-milled, cut and shortened, the silicon oil and a dispersing agent according to the volume ratio of 0.1 percent to 1.0 percent : 93.6 percent to 98.9 percent : 1 percent to 5.4 percent; the preparation steps are as follows: the silicon oil and the dispersing agent are mixed directly according to the volume ratio; under high-shear emulsification condition, the carbon nano tube which is processed by surface functionalization, cutting and shortening are dispersed into the silicon oil and the dispersing agent so as to obtain the silicon oil base nano fluid body containing carbon nano tube. The dispersing agent is a lipophilic nonionic surface active agent and hexamethylene siloxane. The nano fluid body has uniform dispersion, long stabilization time and high heat conduction coefficient. When the volume content of the carbon nano tube of the nano fluid body prepared by the invention is 1.0 percent, the heat conduction coefficient is improved by 30 percent compared with that of the silicon oil.
Description
Technical field
The present invention relates to a kind of preparation method who is used for the enhancement of heat transfer cooling working medium of heat exchange system, be specifically related to a kind of preparation method of suspending stabilized silicon oil-based carbonaceous nano-tube nano-fluid with high thermal conductivity.
Background technology
Limited its application under hot conditions owing to the poor heat stability of some heat-conducting fluids, chemically reactive are high.In addition, along with the heat transfer load and the heat-transfer intensity of the heat exchange system in fields such as the energy, chemical industry, microelectronics, information increases day by day, press for the heat-exchange working medium that development has high heat-transfer performance.Therefore, the exploitation heat-transfer fluid that can be used for hot conditions and have a high thermal conductivity coefficient has become the focus of research.
Heat conduction silicone oil not only has excellent radioresistance, and has excellent high-temperature stability, sustainable being operated under more than 200 degree centigrade the high temperature.Silicone oil has inherent unreactiveness simultaneously, and it can not produce corrosion to metal, also can be unharmful to the sealing member of using in snubber, valve and the instrument.Its thermal conductivity is more stable in very wide temperature range.Therefore, heat conduction silicone oil is the heat-transfer working medium of field of heat transfer first-selection under the hot conditions.Yet, single silicone fluid can not satisfy again that high loading conducts heat and special conditions under the requirement of enhancement of heat transfer, do not meet the trend that heat-exchange system develops to miniaturization and less energy-consumption direction.(3000～3500W/mK) carbon nanotube adds in the heat conduction silicone oil, is expected to prepare the high heat exchanging fluid of heat conductivility will to have high thermal conductivity coefficient.Yet inherent Van der Waals force between the great specific surface area of carbon nanotube and length-to-diameter ratio and the tube and tube is even can not be dispersed in the silicone oil it uniformly and stably under the condition of adding dispersion agent.So what need to be resolved hurrily at present is that even carbon nanotube is disperseed and suspending stabilized problem.
Prepare silicon oil-based carbonaceous nano-tube nano-fluid at present, the method that adopts is to adopt the ultra-sonic dispersion technology that carbon nanotube directly is distributed in the silicone oil base fluid by adding dispersion agent, its shortcoming is the dispersed and stable non-constant of the nano-fluid of preparation, and then has limited the practical application in the heat exchange field.
Summary of the invention
The object of the present invention is to provide a kind ofly be uniformly dispersed, suspending stabilized, have silicon oil-based carbonaceous nano-tube nano-fluid of high thermal conductivity coefficient and preparation method thereof, at first adopt strong mixing acid oxidation and high-energy ball-milling process, carbon nanotube is carried out surface-functionalized and blocks the weak pointization processing.Secondly, the carbon nanotube that processing is obtained is by adding dispersion agent and adopting the high-shear emulsifying technology to be distributed in the silicone oil.The carbon nanotubes silicone oil base nano-fluid that makes have be uniformly dispersed, characteristics such as good stability, thermal conductivity height.The present invention not only overcomes the requirement that single use silicone oil heat transfer can not be satisfied enhancement of heat transfer under high loading heat transfer and the special conditions, also overcome simultaneously and adopt the ultra-sonic dispersion technology that carbon nanotube directly is distributed in the silicone oil base fluid, cause drawbacks such as the nano-fluid dispersiveness for preparing and poor stability.
A kind of preparation method of silicon oil-based carbonaceous nano-tube nano-fluid is characterized in that: it by the surface-functionalized and carbon nanotube, silicone oil and the dispersion agent that block weak pointization through ball milling according to volume ratio 0.1%～1.0%: 93.6%～98.9%: 1%～5.4% forms; Described surface-functionalized and block the carbon nanotube of weak pointization through ball milling, by adopting strong mixing acid oxidation and high-energy ball-milling process, carbon nanotube is carried out surface-functionalized and blocks the weak pointization processing obtaining, preparation process is as follows: at first with silicone oil and dispersion agent according to the direct blend of described volume ratio, under the high-shear emulsifying condition, carbon nanotube surface-functionalized and that block the weak pointization processing is distributed in the mixture of silicone oil and dispersion agent, makes silicon oil-based carbonaceous nano-tube nano-fluid.
Described dispersion agent is the lipophilicity nonionogenic tenside, selects the hexamethyl siloxanes for use.
The present invention compares with existing preparation method, and its advantage and positively effect are: nano-fluid is uniformly dispersed, steady time is long, the thermal conductivity height.The nano-fluid of the present invention's preparation Thermal Conductivity of Nanofluids when the carbon nanotube volume content is 1.0% reaches 30% than the silicone oil raising.
Embodiment
Further set forth the present invention below in conjunction with embodiment, but present embodiment is not limited to the present invention, every employing similarity method of the present invention and similar variation thereof all should be listed protection scope of the present invention in.
Embodiment 1: with silicone oil and hexamethyl siloxanes with 98.9vol% and 1.0vol% mixed, it is surface-functionalized and blocked 0 hour multi-walled carbon nano-tubes of weak pointization processing by ball milling to add 0.1vol% again, through high-shear emulsifying, the finely dispersed silicon oil-based carbonaceous nano-tube nano-fluid stable existence that obtains is more than one month, and the thermal conductivity of its thermal conductivity ratio silicone oil improves 4.3%.
Embodiment 2: with silicone oil and hexamethyl siloxanes with 93.6vol% and 5.4vol% mixed, it is surface-functionalized and blocked 20 hours multi-walled carbon nano-tubes of weak pointization processing by ball milling to add 1.0vol% again, through high-shear emulsifying, the finely dispersed silicon oil-based carbonaceous nano-tube nano-fluid stable existence that obtains is more than 15 days, and the thermal conductivity of its thermal conductivity ratio silicone oil improves 30%.
Embodiment 3: with silicone oil and hexamethyl siloxanes with 97.7vol% and 2vol% mixed, it is surface-functionalized and blocked 10 hours multi-walled carbon nano-tubes of weak pointization processing by ball milling to add 0.3vol% again, through high-shear emulsifying, the finely dispersed silicon oil-based carbonaceous nano-tube nano-fluid stable existence that obtains is more than one month, and the thermal conductivity of its thermal conductivity ratio silicone oil improves 10%.
Embodiment 4: with silicone oil and hexamethyl siloxanes with 96.8vol% and 2.5vol% mixed, it is surface-functionalized and blocked 38 hours multi-walled carbon nano-tubes of weak pointization processing by ball milling to add 0.7vol% again, through high-shear emulsifying, the finely dispersed silicon oil-based carbonaceous nano-tube nano-fluid stable existence that obtains is more than 15 days, and the thermal conductivity of its thermal conductivity ratio silicone oil improves 23%.
Embodiment 5: with silicone oil and hexamethyl siloxanes with 97.5vol% and 2.0vol% mixed, it is surface-functionalized and blocked 5 hours multi-walled carbon nano-tubes of weak pointization processing by ball milling to add 0.5vol% again, through high-shear emulsifying, the finely dispersed silicon oil-based carbonaceous nano-tube nano-fluid stable existence that obtains is more than 10 days, and the thermal conductivity of its thermal conductivity ratio silicone oil improves 12%.
Embodiment 6: with silicone oil and hexamethyl siloxanes with 96.15vol% and 3.0vol% mixed, it is surface-functionalized and blocked 28 hours multi-walled carbon nano-tubes of weak pointization processing by ball milling to add 0.85vol% again, through high-shear emulsifying, the finely dispersed silicon oil-based carbonaceous nano-tube nano-fluid stable existence that obtains is more than 15 days, and the thermal conductivity of its thermal conductivity ratio silicone oil improves 27%.
Claims (2)
1. the preparation method of a silicon oil-based carbonaceous nano-tube nano-fluid is characterized in that: it by the surface-functionalized and carbon nanotube, silicone oil and the dispersion agent that block weak pointization through ball milling according to volume ratio 0.1%～1.0%: 93.6%～98.9%: 1%～5.4% forms; Described surface-functionalized and block the carbon nanotube of weak pointization through ball milling, by adopting strong mixing acid oxidation and high-energy ball-milling process, carbon nanotube is carried out surface-functionalized and blocks the weak pointization processing obtaining, preparation process is as follows: at first with silicone oil and dispersion agent according to the direct blend of described volume ratio, under the high-shear emulsifying condition, carbon nanotube surface-functionalized and that block the weak pointization processing is distributed in the mixture of silicone oil and dispersion agent, makes silicon oil-based carbonaceous nano-tube nano-fluid.
2. the preparation method of a kind of silicon oil-based carbonaceous nano-tube nano-fluid according to claim 1, it is characterized in that: described dispersion agent is the lipophilicity nonionogenic tenside, selects the hexamethyl siloxanes for use.
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| CN2008100429825A CN101407634B (en) | 2008-09-16 | 2008-09-16 | Preparation of silicon oil-based carbonaceous nano-tube nano-fluid |
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| CN2008100429825A CN101407634B (en) | 2008-09-16 | 2008-09-16 | Preparation of silicon oil-based carbonaceous nano-tube nano-fluid |
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| CN101407634B true CN101407634B (en) | 2011-05-18 |
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| CN102634212B (en) * | 2012-04-23 | 2015-11-25 | 湖州明朔光电科技有限公司 | A kind of heat conductive silicone grease composition |
| CN105154026B (en) * | 2015-09-09 | 2019-05-14 | 昆明理工大学 | A kind of nanometer cycle fluid and preparation method for high temperature Organic Rankine Cycle |
| CN111334044B (en) * | 2020-04-22 | 2022-02-25 | 中国工程物理研究院电子工程研究所 | Organic silicone gel for precise electronic component encapsulation and use method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1696053A (en) * | 2004-05-14 | 2005-11-16 | 中国科学院成都有机化学有限公司 | Method for truncating Nano carbon tubes |
| US20070158610A1 (en) * | 2006-01-12 | 2007-07-12 | Haiping Hong | Carbon naoparticle-containing hydrophilic nanofluid |
| CN101063032A (en) * | 2006-04-28 | 2007-10-31 | 财团法人工业技术研究院 | A method for preparing carbon nanofluid |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1696053A (en) * | 2004-05-14 | 2005-11-16 | 中国科学院成都有机化学有限公司 | Method for truncating Nano carbon tubes |
| US20070158610A1 (en) * | 2006-01-12 | 2007-07-12 | Haiping Hong | Carbon naoparticle-containing hydrophilic nanofluid |
| CN101063032A (en) * | 2006-04-28 | 2007-10-31 | 财团法人工业技术研究院 | A method for preparing carbon nanofluid |
Non-Patent Citations (2)
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| JP特开2004-75468A 2004.03.11 |
| JP特开2007-231219A 2007.09.13 |
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