CN103045180A - Low-conductivity nanofluid and preparation method thereof - Google Patents
Low-conductivity nanofluid and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 150000002500 ions Chemical class 0.000 claims abstract description 23
- 239000002270 dispersing agent Substances 0.000 claims abstract description 19
- 239000011858 nanopowder Substances 0.000 claims abstract description 16
- 229910021642 ultra pure water Inorganic materials 0.000 claims abstract description 16
- 239000012498 ultrapure water Substances 0.000 claims abstract description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 9
- 239000002105 nanoparticle Substances 0.000 claims abstract description 9
- 239000000725 suspension Substances 0.000 claims description 56
- 239000012530 fluid Substances 0.000 claims description 51
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims description 37
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 33
- 239000003456 ion exchange resin Substances 0.000 claims description 21
- 229920003303 ion-exchange polymer Polymers 0.000 claims description 21
- 239000006185 dispersion Substances 0.000 claims description 20
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- 229910052739 hydrogen Inorganic materials 0.000 claims description 17
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 16
- 239000003957 anion exchange resin Substances 0.000 claims description 16
- 239000003729 cation exchange resin Substances 0.000 claims description 16
- 239000001257 hydrogen Substances 0.000 claims description 16
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 16
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- QPLDLSVMHZLSFG-UHFFFAOYSA-N CuO Inorganic materials [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 12
- 238000001354 calcination Methods 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 12
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
- 239000008187 granular material Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 229960004643 cupric oxide Drugs 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- 150000001408 amides Chemical class 0.000 claims description 4
- 239000005543 nano-size silicon particle Substances 0.000 claims description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 4
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 4
- 239000003643 water by type Substances 0.000 claims description 4
- 238000010907 mechanical stirring Methods 0.000 claims description 3
- SIQZJFKTROUNPI-UHFFFAOYSA-N 1-(hydroxymethyl)-5,5-dimethylhydantoin Chemical compound CC1(C)N(CO)C(=O)NC1=O SIQZJFKTROUNPI-UHFFFAOYSA-N 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 15
- 239000000110 cooling liquid Substances 0.000 abstract description 2
- 230000005684 electric field Effects 0.000 description 7
- 238000001132 ultrasonic dispersion Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 239000012298 atmosphere Substances 0.000 description 5
- 239000007791 liquid phase Substances 0.000 description 5
- 125000000129 anionic group Chemical group 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000007704 wet chemistry method Methods 0.000 description 3
- JJLJMEJHUUYSSY-UHFFFAOYSA-L Copper hydroxide Chemical compound [OH-].[OH-].[Cu+2] JJLJMEJHUUYSSY-UHFFFAOYSA-L 0.000 description 2
- 239000005750 Copper hydroxide Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000012809 cooling fluid Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910001956 copper hydroxide Inorganic materials 0.000 description 2
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000010504 bond cleavage reaction Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 229910000365 copper sulfate Inorganic materials 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 230000009881 electrostatic interaction Effects 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
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- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- XUIMIQQOPSSXEZ-NJFSPNSNSA-N silicon-30 atom Chemical compound [30Si] XUIMIQQOPSSXEZ-NJFSPNSNSA-N 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- YWYZEGXAUVWDED-UHFFFAOYSA-N triammonium citrate Chemical compound [NH4+].[NH4+].[NH4+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O YWYZEGXAUVWDED-UHFFFAOYSA-N 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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Abstract
The invention relates to a low-conductivity nanofluid and a preparation method thereof, belonging to the field of electrical and electronic equipment cooling. The conductivity of the nanofluid is less than 1 microsecond/cm; and the nanofluid comprises the following components in mass percentage: 40.0-99.0% of ultrapure water, 0.0-60.0% of dihydric alcohol, 0.1-10.0% of nanopowder and 0.01-3.0% of dispersing agent. The preparation method comprises the following steps of: dispersing the calcined nanopowder into ultrapure water, removing charged foreign ions, coating the dispersing agent on the surfaces of nanoparticles, and removing foreign ions again to obtain the low-conductivity nanofluid. Compared with the conventional cooling liquid, the nanofluid is high in heat exchanging capability and significant in technical advantages.
Description
Technical field:
The present invention relates to a kind of low conductivity nano-fluid and preparation method thereof, belong to power electronic equipment cooling field.
Background technology:
Along with the develop rapidly of Power Electronic Technique, high-power, a large amount of development and applications of high power density device quilt.Power electronic equipment is in increased power, and its hear rate is also increasing, and the surface heat flux during some power electronic devices work has reached every square centimeter of tens of watts and even upper hectowatt.If a large amount of hear rates can not in time distribute, the reliability of electronics will be affected greatly.Therefore, how effectively the waste heat in the power electronic equipment to be emitted, thereby prolong its life-span, strengthen reliability, tool is of great significance.At present, that the type of cooling that power electronic equipment is commonly used mainly contains is natural air cooled, forced air cooling and force the liquid cooling three major types.Wherein, natural air cooled limited with cooling power forced air cooling, often can only be used for the lower occasion of heat flow density; The heat flow density that liquid cooling is born is large, and radiating efficiency is high, and the heat load thermograde is little, the occasion that suitable heat flow density is higher.The cooling fluid that liquid cooling adopts mainly contains water, ethylene glycol, wet goods, and still, its thermal conductivity of these liquid is low, exchange capability of heat is poor, and oneself is necessary the cooling fluid of development of new, high efficient heat exchanging through not satisfying the heat radiation requirement of high loading power electronic equipment.The appearance of nano-fluid technology is for the development of engine-cooling system provides new thinking.Nano-fluid is that metal or nonmetal nano particle stable suspersion are arrived a kind of novel heat exchange working medium that forms in the conventional fluid (water, ethylene glycol etc.).Existing studies show that compared with conventional fluid, and nano-fluid has higher thermal conductivity and good heat exchange property, thereby nano-fluid is expected to solve the heat radiation requirement of power electronic equipment high loading.
As everyone knows, most power electronic equipments often higher electric field of existences that is in operation, have up to several kilovolts, several ten thousand volts even hundreds of thousands of lie prostrate.And nano grain surface has scission of link, and particle surface is usually with electric charge.In electric field, the nano particle in the nano-fluid very easily produces electrostatic interaction with electrode, thereby produces absorption and deposition, causes reduction of heat exchange efficiency even cooling failure.Therefore, be applied to nano-fluid the cooling of power electronic equipment, how to eliminate nano particle surface charge, reduce the specific conductivity of nano-fluid, prepare and can under electric field, stablize and the good nano-fluid of heat exchange property is key.The method that can prepare in enormous quantities nano-fluid of report mainly contains dispersion method and wet chemistry method at present.Dispersion method is by the pH value that changes system, adding positively charged ion or anionic dispersing agents etc., and is aided with ultrasonic or mechanical stirring is distributed to nano-powder in the basic liquid and forms nano-fluid.Prepared Al such as Zhu Dongsheng etc. by changing change pH values and adding the anionic dispersing agents Sodium dodecylbenzene sulfonate
2O
3/ water nano-fluid (Materials Science and Engineering, 2008,1,56-61); Peng Xiaofei etc. utilize the anionic dispersing agents Sodium dodecylbenzene sulfonate, and are aided with ultra-sonic dispersion, nanometer Al
2O
3, nanometer CuO, nanometer SiO
2, the powder such as nanometer Cu is distributed to and obtained multiple nano-fluid (Peng Xiaofei, nano-fluid high temperature heat transfer underlying issue research in the car radiator, Zhejiang University's doctorate paper, 2007) in distilled water, ethylene glycol, the propylene glycol.The purpose that changes change pH values, adding positively charged ion or anionic dispersing agents is to improve the zeta current potential of nano grain surface, thereby improves the conventional stability of nano-fluid.But the raising of zeta current potential can cause the increase of nano-fluid specific conductivity, thereby the nano-fluid of like this preparation can't be for the cooling of the power electronic equipment that has electric field to exist.Wet chemistry method is to utilize the chemical reaction in the liquid phase directly to prepare nano particle in liquid phase medium, thereby obtains nano-fluid, and the method combines the preparation of the preparation of nano particle and nano-fluid.For example, Zhu etc. add reductive agent in the ethylene glycol solution of copper sulfate, adopt microwave heating directly to obtain Cu/ ethylene glycol nano-fluid (J.Colloid Interf.Sci.2004,277,100); In water, the employing ammonium citrate is dispersion agent to Zhu etc. the copper hydroxide nanoparticulate dispersed, makes copper hydroxide be decomposed into cupric oxide by ultrasonic and microwave heating, thus acquisition CuO/ water nano-fluid (J.Phys.Chem.C2007,111,1646-1650).Adopt in the nano-fluid of wet chemistry method preparation, because the foreign ion that exists raw material to introduce, its specific conductivity is higher, can't stablize under electric field, also just can't satisfy the requirement of power electronic equipment cooling.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of low conductivity nano-fluid and preparation method thereof, the requirement that the power electronic equipment that can satisfy has electric field to exist cools off.
To achieve these goals, the present invention adopts following technical measures:
Low conductivity nano-fluid of the present invention, its specific conductivity is pressed mass percent less than 1 μ s/cm, and nano-fluid comprises following component: ultrapure water 40.0～99.0%, dibasic alcohol 0.0～60.0%, nano-powder 0.1～10.0%, dispersion agent 0.01～3.0%.
Wherein, described ultrapure resistivity of water is greater than 15M Ω/cm.Described nano-powder is any one or the arbitrary combination in nano silicon oxide, nanometer silicon carbide, nano aluminium oxide, nano zine oxide, nano cupric oxide, the nano titanium oxide; The particle diameter of nano-powder is 10～100nm.Described dispersion agent is any one or its arbitrary combination in polyoxyethylene-type non-ionic dispersing agent, polyvalent alcohol type non-ionic dispersing agent, the alkylol amide type non-ionic dispersing agent; Press mass percent, the add-on of dispersion agent is 1～30% of nano particle.Described dibasic alcohol is any one or the arbitrary combination in ethylene glycol, propylene glycol, the Diethylene Glycol.
The preparation method of low conductivity nano-fluid of the present invention comprises following consecutive steps:
(1) nano-powder is carried out calcination processing;
(2) by mass, the nano-powder after 1 part of calcination processing is mixed with 5～30 parts of ultrapure waters, ultrasonic or powerful mechanical stirring 0.5～12 hour obtains finely dispersed suspension;
(3) suspension of gained is passed through ion exchange resin, remove charged foreign ion, make the specific conductivity of suspension less than 5 μ s/cm;
(4) in the suspension of low conductivity, add dispersion agent, stirred 1～24 hour, make dispersion agent evenly be coated on nano grain surface;
(5) nano granule suspension after the coating by ion exchange resin, is removed charged foreign ion again, makes the specific conductivity of suspension less than 1 μ s/cm;
(6) add ultrapure water or dibasic alcohol in the suspension of step (5), mix the nano-fluid that obtains low conductivity, its specific conductivity is less than 1 μ s/cm.
Wherein, the calcination processing temperature of described nano-powder is 300～600 ℃.Described ion exchange resin is that hydrogen type cation exchange resin mixes the Ion Exchange Resin In The Mixing Bed that forms with the hydroxyl type anion exchange resin; The mass ratio of hydrogen type cation exchange resin and hydroxyl type anion exchange resin is 1:0.5～3.
In preparation process of the present invention, by nano-powder is calcined, with elimination nano grain surface defective and absorption impurity, thereby reduce the nano grain surface electric charge in certain temperature and atmosphere; Utilize ion exchange resin to the adsorption of charged foreign ion, remove foreign ion, thereby further reduce the specific conductivity of nano-fluid; Utilize the dissemination of specific dispersant, can improve the dispersion stabilization of nano particle in nano-fluid, further reduce simultaneously the specific conductivity of nano-fluid.
Compared with prior art, the present invention has following positively effect:
1, the specific conductivity of nano-fluid of the present invention is less than 1 μ s/cm, can stable existence in electric field, and do not adsorb, do not deposit, can be used in the cooling of power electronic equipment;
2, with tradition cooling liquid phase ratio, its exchange capability of heat improves 5～30%, thereby has obvious technical superiority.
Embodiment
Below in conjunction with embodiment, further set forth the present invention.
Embodiment 1
With the nano aluminium oxide of particle diameter 50 nanometers at 600 ℃, H
2Calcination processing 3h under the atmosphere;
Behind the cool to room temperature, the ultrapure water that to get 1 kilogram of nano aluminium oxide and 10 kilograms of resistivity be 16M Ω/cm mixes, and ultra-sonic dispersion 12 hours obtains finely dispersed suspension;
The suspension of gained is mixed the Ion Exchange Resin In The Mixing Bed (mass ratio of the two is 1:2) that forms by hydrogen type cation exchange resin with the hydroxyl type anion exchange resin, remove charged foreign ion, make the specific conductivity of suspension less than 5 μ s/cm;
In the suspension of low conductivity, add 100 gram polyoxyethylene-type non-ionic dispersing agents, stirred 4 hours, make dispersion agent evenly be coated on nano grain surface;
Nano granule suspension after the coating mixes the Ion Exchange Resin In The Mixing Bed (mass ratio of the two is 1:1) that forms by hydrogen type cation exchange resin again with the hydroxyl type anion exchange resin, remove charged foreign ion, make the specific conductivity of suspension less than 1 μ s/cm;
Add 10 kilograms of ultrapure waters that resistivity is 17M Ω/cm in above-mentioned suspension, mix the nano-fluid that obtains low conductivity, its specific conductivity is 0.1～0.5 μ s/cm;
Compare with pure water, its exchange capability of heat improves 25%.
Embodiment 2
With the nanometer silicon carbide of particle diameter 40 nanometers calcination processing 1h under 450 ℃, oxygen atmosphere;
Behind the cool to room temperature, the ultrapure water that to get 1 kilogram of nanometer silicon carbide and 20 kilograms of resistivity be 16M Ω/cm mixes, and ultra-sonic dispersion 6 hours obtains finely dispersed suspension;
The suspension of gained is mixed the Ion Exchange Resin In The Mixing Bed (mass ratio of the two is 1:1) that forms by hydrogen type cation exchange resin with the hydroxyl type anion exchange resin, remove charged foreign ion, make the specific conductivity of suspension less than 5 μ s/cm;
In the suspension of low conductivity, add 300 gram alkylol amide type non-ionic dispersing agents, stirred 12 hours, make dispersion agent evenly be coated on nano grain surface;
Nano granule suspension after the coating mixes the Ion Exchange Resin In The Mixing Bed (mass ratio of the two is 1:0.8) that forms by hydrogen type cation exchange resin again with the hydroxyl type anion exchange resin, remove charged foreign ion, make the specific conductivity of suspension less than 1 μ s/cm;
Add 10 kilograms of ultrapure water and 10 kilograms of ethylene glycol that resistivity is 17M Ω/cm in above-mentioned suspension, mix the nano-fluid that obtains low conductivity, its specific conductivity is 0.05～0.3 μ s/cm;
With with the water of equal proportion/ethylene glycol basis liquid phase ratio, its exchange capability of heat improves 30%.
Embodiment 3
With the nano titanium oxide of particle diameter 20 nanometers calcination processing 6h under 300 ℃, nitrogen atmosphere;
Behind the cool to room temperature, the ultrapure water that to get 1 kilogram of nano titanium oxide and 30 kilograms of resistivity be 16M Ω/cm mixes, and ultra-sonic dispersion 6 hours obtains finely dispersed suspension;
The suspension of gained is mixed the Ion Exchange Resin In The Mixing Bed (mass ratio of the two is 1:1) that forms by hydrogen type cation exchange resin with the hydroxyl type anion exchange resin, remove charged foreign ion, make the specific conductivity of suspension less than 5 μ s/cm;
In the suspension of low conductivity, add 100 gram polyvalent alcohol type non-ionic dispersing agents, stirred 3 hours, make dispersion agent evenly be coated on nano grain surface;
Nano granule suspension after the coating mixes the Ion Exchange Resin In The Mixing Bed (mass ratio of the two is 1:1) that forms by hydrogen type cation exchange resin again with the hydroxyl type anion exchange resin, remove charged foreign ion, make the specific conductivity of suspension less than 1 μ s/cm;
Add 15 kilograms of ultrapure water and 15 kilograms of propylene glycol that resistivity is 17M Ω/cm in above-mentioned suspension, mix the nano-fluid that obtains low conductivity, its specific conductivity is 0.1～0.8 μ s/cm;
With with the water of equal proportion/propylene glycol basis liquid phase ratio, its exchange capability of heat improves 10%.
Embodiment 4
With the nano zine oxide of particle diameter 60 nanometers calcination processing 2h under 500 ℃, oxygen atmosphere;
Behind the cool to room temperature, the ultrapure water that to get 1 kilogram of nano zine oxide and 25 kilograms of resistivity be 16M Ω/cm mixes, and ultra-sonic dispersion 12 hours obtains finely dispersed suspension;
The suspension of gained is mixed the Ion Exchange Resin In The Mixing Bed (mass ratio of the two is 1:3) that forms by hydrogen type cation exchange resin with the hydroxyl type anion exchange resin, remove charged foreign ion, make the specific conductivity of suspension less than 5 μ s/cm;
In the suspension of low conductivity, add 300 gram polyoxyethylene-type non-ionic dispersing agents, stirred 6 hours, make dispersion agent evenly be coated on nano grain surface;
Nano granule suspension after the coating mixes the Ion Exchange Resin In The Mixing Bed (mass ratio of the two is 1:2) that forms by hydrogen type cation exchange resin again with the hydroxyl type anion exchange resin, remove charged foreign ion, make the specific conductivity of suspension less than 1 μ s/cm;
Add 10 kilograms of ultrapure water and 15 kilograms of Diethylene Glycols that resistivity is 17M Ω/cm in above-mentioned suspension, mix the nano-fluid that obtains low conductivity, its specific conductivity is 0.3～0.8 μ s/cm;
With compare with the water of equal proportion/Diethylene Glycol basal liquid, its exchange capability of heat improves 12%.
Embodiment 5
With the nano silicon oxide of particle diameter 30 nanometers calcination processing 6h under 600 ℃, oxygen atmosphere;
Behind the cool to room temperature, the ultrapure water that to get 1 kilogram of nano silicon oxide and 30 kilograms of resistivity be 16M Ω/cm mixes, and ultra-sonic dispersion 12 hours obtains finely dispersed suspension;
The suspension of gained is mixed the Ion Exchange Resin In The Mixing Bed (mass ratio of the two is 1:1.5) that forms by hydrogen type cation exchange resin with the hydroxyl type anion exchange resin, remove charged foreign ion, make the specific conductivity of suspension less than 5 μ s/cm;
In the suspension of low conductivity, add 300 gram polyvalent alcohol type non-ionic dispersing agents, stirred 6 hours, make dispersion agent evenly be coated on nano grain surface;
Nano granule suspension after the coating mixes the Ion Exchange Resin In The Mixing Bed (mass ratio of the two is 1:1.2) that forms by hydrogen type cation exchange resin again with the hydroxyl type anion exchange resin, remove charged foreign ion, make the specific conductivity of suspension less than 1 μ s/cm;
Add 20 kilograms of ultrapure water and 30 kilograms of ethylene glycol that resistivity is 17M Ω/cm in above-mentioned suspension, mix the nano-fluid that obtains low conductivity, its specific conductivity is 0.3～0.8 μ s/cm;
With with the water of equal proportion/ethylene glycol basis liquid phase ratio, its exchange capability of heat improves 8%.
Embodiment 6
With the nano cupric oxide of particle diameter 60 nanometers calcination processing 1h under 350 ℃, nitrogen atmosphere;
Behind the cool to room temperature, the ultrapure water that to get 1 kilogram of nano cupric oxide and 10 kilograms of resistivity be 16M Ω/cm mixes, and ultra-sonic dispersion 3 hours obtains finely dispersed suspension;
The suspension of gained is mixed the Ion Exchange Resin In The Mixing Bed (mass ratio of the two is 1:0.8) that forms by hydrogen type cation exchange resin with the hydroxyl type anion exchange resin, remove charged foreign ion, make the specific conductivity of suspension less than 5 μ s/cm;
In the suspension of low conductivity, add 50 gram alkylol amide type non-ionic dispersing agents, stirred 2 hours, make dispersion agent evenly be coated on nano grain surface;
Nano granule suspension after the coating mixes the Ion Exchange Resin In The Mixing Bed (mass ratio of the two is 1:1) that forms by hydrogen type cation exchange resin again with the hydroxyl type anion exchange resin, remove charged foreign ion, make the specific conductivity of suspension less than 1 μ s/cm;
Add 10 kilograms of ultrapure waters that resistivity is 17M Ω/cm in above-mentioned suspension, mix the nano-fluid that obtains low conductivity, its specific conductivity is 0.05～0.5 μ s/cm;
Compare with pure water, its exchange capability of heat improves 15%.
Claims (8)
1. a low conductivity nano-fluid is characterized in that, the specific conductivity of nano-fluid is less than 1 μ s/cm, press mass percent, nano-fluid comprises following component: ultrapure water 40.0～99.0%, dibasic alcohol 0.0～60.0%, nano-powder 0.1～10.0%, dispersion agent 0.01～3.0%.
2. low conductivity nano-fluid as claimed in claim 1, it is characterized in that: described ultrapure resistivity of water is greater than 15M Ω/cm.
3. low conductivity nano-fluid as claimed in claim 1 is characterized in that: described nano-powder is any one or the arbitrary combination in nano silicon oxide, nanometer silicon carbide, nano aluminium oxide, nano zine oxide, nano cupric oxide, the nano titanium oxide; The particle diameter of nano-powder is 10～100nm.
4. low conductivity nano-fluid as claimed in claim 1 is characterized in that: described dispersion agent is any one or its arbitrary combination in polyoxyethylene-type non-ionic dispersing agent, polyvalent alcohol type non-ionic dispersing agent, the alkylol amide type non-ionic dispersing agent; Press mass percent, the add-on of dispersion agent is 1～30% of nano particle.
5. low conductivity nano-fluid as claimed in claim 1 is characterized in that: described dibasic alcohol is any one or the arbitrary combination in ethylene glycol, propylene glycol, the Diethylene Glycol.
6. the preparation method of low conductivity nano-fluid as claimed in claim 1, it is characterized in that: the method comprises following consecutive steps:
(1) nano-powder is carried out calcination processing;
(2) by mass, the nano-powder after 1 part of calcination processing is mixed with 5～30 parts of ultrapure waters, ultrasonic or powerful mechanical stirring 0.5～12 hour obtains finely dispersed suspension;
(3) suspension of gained is passed through ion exchange resin, remove charged foreign ion, make the specific conductivity of suspension less than 5 μ s/cm;
(4) in the suspension of low conductivity, add dispersion agent, stirred 1～24 hour, make dispersion agent evenly be coated on nano grain surface;
(5) nano granule suspension after the coating by ion exchange resin, is removed charged foreign ion again, makes the specific conductivity of suspension less than 1 μ s/cm;
(6) add ultrapure water or dibasic alcohol in the suspension of step (5), mix the nano-fluid that obtains low conductivity, its specific conductivity is less than 1 μ s/cm.
7. the preparation method of low conductivity nano-fluid as claimed in claim 6, it is characterized in that: the calcination processing temperature of described nano-powder is 300～600 ℃.
8. low conductivity nano-fluid preparation method as claimed in claim 6 is characterized in that: described ion exchange resin is that hydrogen type cation exchange resin mixes the Ion Exchange Resin In The Mixing Bed that forms with the hydroxyl type anion exchange resin; The mass ratio of hydrogen type cation exchange resin and hydroxyl type anion exchange resin is 1:0.5～3.
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| CN201210573980.5A CN103045180B (en) | 2012-12-26 | 2012-12-26 | Low-conductivity nanofluid and preparation method thereof |
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|---|---|---|---|
| CN201210573980.5A CN103045180B (en) | 2012-12-26 | 2012-12-26 | Low-conductivity nanofluid and preparation method thereof |
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| CN103045180A true CN103045180A (en) | 2013-04-17 |
| CN103045180B CN103045180B (en) | 2015-06-10 |
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| CN104164222A (en) * | 2014-08-01 | 2014-11-26 | 中山火炬职业技术学院 | High-heat conductivity coefficient water-based nanofluid and preparation method thereof |
| CN104513649A (en) * | 2013-09-27 | 2015-04-15 | 江门市江海区一言科技有限公司 | Anhydrous cooling liquid for engines and preparation method thereof |
| CN105651104A (en) * | 2016-01-04 | 2016-06-08 | 郑州轻工业学院 | Anti-frosting LNG air-heated nanofluid heat exchange pipe |
| CN106634861A (en) * | 2016-10-12 | 2017-05-10 | 哈尔滨工业大学 | Preparation method of low-concentration silicon dioxide nano fluid based on water/ethylene glycol |
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| CN104164222A (en) * | 2014-08-01 | 2014-11-26 | 中山火炬职业技术学院 | High-heat conductivity coefficient water-based nanofluid and preparation method thereof |
| CN105651104A (en) * | 2016-01-04 | 2016-06-08 | 郑州轻工业学院 | Anti-frosting LNG air-heated nanofluid heat exchange pipe |
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| CN109370540A (en) * | 2018-11-14 | 2019-02-22 | 深圳市爱能森储能技术创新有限公司 | Thermally conductive suspension and preparation method thereof |
| CN112239652A (en) * | 2019-07-17 | 2021-01-19 | 株式会社丰田中央研究所 | Cooling liquid |
| CN112239652B (en) * | 2019-07-17 | 2022-05-13 | 株式会社丰田中央研究所 | Cooling liquid |
| CN112457822A (en) * | 2020-11-04 | 2021-03-09 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Fuel cell cooling liquid and preparation method thereof |
| CN113278403A (en) * | 2021-04-19 | 2021-08-20 | 江西车仆实业有限公司 | Hydrogen power fuel cell cooling liquid containing nano boron nitride and preparation method thereof |
| CN113528096A (en) * | 2021-07-29 | 2021-10-22 | 胡叶根 | Efficient heat transfer hydrogen fuel cell cooling liquid |
| WO2023004943A1 (en) * | 2021-07-30 | 2023-02-02 | 李树成 | Charging cable cooling liquid and preparation method therefor |
| CN113969141A (en) * | 2021-11-22 | 2022-01-25 | 卓聪（上海）环保科技发展有限公司 | Immersion type cooling liquid for IT communication equipment and preparation method thereof |
| CN115160994A (en) * | 2022-09-09 | 2022-10-11 | 纯牌科技股份有限公司 | Preparation method of automobile engine cooling liquid containing nano titanium |
| CN115160994B (en) * | 2022-09-09 | 2022-12-02 | 纯牌科技股份有限公司 | Preparation method of automobile engine cooling liquid containing nano titanium |
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