CN109054791A - A kind of water base carbon nanofluid and preparation method thereof - Google Patents
A kind of water base carbon nanofluid and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of water base carbon nanofluids, are made of carbon nano-particle and alkaline aqueous solution, and wherein the mass percent of carbon nano-particle is 0.001%~5%.The invention also discloses a kind of preparation methods of water base carbon nanofluid, disperse the carbon nano-particle of aforementioned proportion in the alkaline aqueous solution of pH=8-12, and the water base carbon nanofluid can be obtained.Carbon nano-particle surface wettability of the present invention can change with the variation of environment pH, in alkaline environment, carbon nano-particle surface carboxylic's group is changed into carboxylate ion group, and carbon nano-particle wetability is changed into hydrophilic by hydrophobic, and dispersion that can be stable is in an aqueous medium；In neutral or acidic environment, carbon nano-particle surface carboxylatre's ionic group is changed into carboxylic acid group, carbon nano-particle wetability by it is hydrophilic be changed into it is hydrophobic.Nano-fluid preparation process of the invention is simple, dispersion is uniform, stability is good, plays the role of good increasing injection and improves recovery ratio, is easy to extemporaneous preparation and large-scale application.
Description
Technical field
The invention belongs to nano-functional materials and oil field chemical technical field, and in particular to a kind of water base carbon nanofluid
And preparation method thereof.
Background technique
Petroleum has irreplaceable role as a kind of high efficient energy sources in national economy.With Chinese national economy
It increases rapidly, oil demand is continuously improved.With going deep into for oil-gas exploration and development, the ratio of Low Permeability Oil/gas resources exploration
Again will be increasing, the reserves for especially newly verifying extra-low-permeability reservoir and compact oil reservoir in recent years are especially abundant.But Oil in Super-low Permeability
It is developed with compact oil reservoir reservoir micro-nano pore throat, water injection pressure is high, and imbibition oil extraction is difficult, improves the effective use rate of reserves
It faces the challenge.
In recent years, with the increase of the development of nanotechnology and oil-gas field development difficulty, nanotechnology is gradually applied to oil
Gas field development field." Energy Fuels " the 1st phase " Enhanced Heavy Oil Recovery in of volume 28 in 2014
Sandstone Cores Using TiO2A Nanofluids " text reports a kind of nano titanium oxide dispersion and is used for
Heavy oil improves recovery ratio, the results showed that recovery ratio can be increased to 80% from 49% by nano particle, and main function mechanism is profit
Oil wet surface is converted to water-wet surface by moist conversion, nano-titanium dioxide, and oil is stripped from wall surface, nano material interaction
Key effect is played to wetability conversion with adsorption mechanism, but its dispersion particle diameter is larger (average grain diameter 63nm), applies hypotonic
Reservoir is also easy to produce matrix pores blocking, to cause reservoir damage.The polysilicic material (bubble Lei Xier) of Russia's production is to utilize
The additive of gamma-rays radioactivity activation is to SiO2Carry out the product of chemical modification, its discrete particle size in 10~500nm,
More than 200 mouth wells are handled with polysilicic material in ground oil fields such as West Siberia, Qiu Ming and black Mahmut Demir bases, increasing injection effect is good
Good, this system, as dispersed phase, has serious pollution to environment using diesel oil or mixed benzene, and benzene analog derivative is more toxic,
Construction environment is more severe, endangers operator's physical safety.
" oilfield chemistry " the 2nd phase in 2012 " application study of water-base nano polysilicon emulsion system ", a text report was prepared for having
The poly- silicon of the dewatering nano of water dispersible replaces conventional organic dispersing agent using water as agent is carried, and the clarification of nano polysilicon lotion is saturating
Bright, water-base nano augmented injection formula of liquid is 1.75 ‰ nano polysilicons, 2 ‰ dispersion aids, and water-base nano polysilicon lotion can make rock table
Face becomes strong-hydrophobicity from hydrophily, rock core flowing experiment the result shows that, after water-base nano polysilicon is handled, water phase permeability is flat
40% is improved, but the product introduces a large amount of emulsifiers formation microemulsions to improve water solubility, and needs when the use of scene
Induction demulsification increases Operating Complexity and product price, and surfactant is by physical action stabilized scattering nano
Grain, physical action is destroyed in scour process, causes nano material aggregation sedimentation serious.
Since itself of Oil in Super-low Permeability and compact oil reservoir rock bury, fine and close, pore constriction is tiny, and porosity is small, and permeability is very
The features such as poor, nanometer technology of reservoir sweep are very restricted using due to factors such as toxicity, dispersion degree, stability.
Summary of the invention
The purpose of the present invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of water base carbon nanofluid and its preparation
Method, the water base carbon nanofluid have the characteristics that preparation is simple, dispersion is uniform, stability is good.
To achieve the above object, the present invention adopts the following technical solutions:
A kind of water base carbon nanofluid, is made of carbon nano-particle and alkaline aqueous solution, wherein the quality of carbon nano-particle
Percentage is 0.001%~5%.
Preferably, the alkaline aqueous solution pH is 8~12.
Preferably, the solute in the alkaline aqueous solution is sodium hydroxide, potassium hydroxide, sodium carbonate, hydration an ammonia, phosphoric acid
The combination of one or more of sodium, disodium-hydrogen, sodium dihydrogen phosphate, potassium phosphate, potassium phosphate,monobasic and potassium dihydrogen phosphate.
Preferably, the dispersion particle diameter of the carbon nano-particle is 5~20nm.
Preferably, the preparation method of the carbon nano-particle includes the following steps:
(1) by organic acid, exothermic agent and the uniform hybrid reaction of water, until being cooled to room temperature, the first reaction system is obtained；
(2) solid in first reaction system washed, separated, then dried, finally obtained the carbon and receive
Rice grain.
Preferably, the weight ratio of the organic acid in the step (1), exothermic agent and water are as follows: 10~100:25~250:1~
10。
Preferably, the organic acid in the step (1) is one or more of small molecule acid and unsaturated fatty acid
Combination；The small molecule acid chemical formula is CH3(CH2)nCOOH, wherein 0≤n≤3, n are integer；The unsaturated fat acidification
Formula is CH3(CH2)aHC=CH (CH2)bCOOH or CH3(CH2)cHC=CH (CH2)dHC=CH (CH2)eCOOH or CH3(CH2)fHC=CH (CH2)gHC=CH (CH2)hHC=CH (CH2)iCOOH, wherein 1≤a≤10,1≤b≤10,1≤c≤5,1≤d≤
5,1≤e≤5,1≤f≤4,1≤g≤4,1≤h≤4,1≤i≤4, a, b, c, d, e, f, g, h and i are integer.
Preferably, the exothermic agent in the step (1) is one in sodium oxide molybdena, potassium oxide, calcium oxide and phosphorus pentoxide
Kind or several combinations.
Preferably, in the step (2), the solid in first reaction system is washed, is separated process weight
4 times multiple, separate mode is centrifugation or filtering, and drying condition is to be dried in vacuo for 24 hours at 50 DEG C.
The invention also discloses a kind of preparation methods of water base carbon nanofluid, and the carbon nano-particle of aforementioned proportion is dispersed
In the alkaline aqueous solution of pH=8-12, the water base carbon nanofluid can be obtained.
The invention has the advantages that
(1) carbon nano-particle prepared by the present invention makes its surface wettability can be with ring because its surface has carboxylic acid group
The variation of border pH and change, when in alkaline environment, carbon nano-particle surface carboxylic's group is changed into carboxylate ion group,
So that carbon nano-particle wetability of the present invention by it is hydrophobic be changed into it is hydrophilic, and then can be stable be dispersed in aqueous medium
In；When in neutral or acidic environment, carbon nano-particle surface carboxylatre's ionic group is changed into carboxylic acid group, to make
Carbon nano-particle wetability of the present invention by it is hydrophilic be changed into it is hydrophobic.
(2) carbon nano-particle of the invention can not add dispersing agent and by ancillary equipment self-dispersing in aqueous slkali, this
The prior art need to can just prepare relevant nanometer fluid by dispersing agent and dispersing apparatus (stirring or ultrasound etc.) in field.
(3) behind water base carbon nanofluid of the invention injection stratum, nano-fluid is spread in Reservoir Fracture or stromal surface
Oil is isolated with reservoir rock surface, makes oily phase transition free phase, with the flowing of fluid in reservoir, free state oil phase by exhibition
It is discharged, to improve Oil in Super-low Permeability and compact oil reservoir imbibition oil extraction efficiency.At the same time, carbon nano-particle is on reservoir rock surface
Adsorbed close forms nano adsorption layer.During following injected water, pH value becomes neutral from alkalinity in the water environment of stratum, carbon nanometer
Particle surface carboxylate groups are changed into carboxylic acid group, and nano grain surface wetability is changed into hydrophobicity by hydrophily, thus
So that nano adsorption layer reduces the work of adhesion of water phase, and then achievees the purpose that reduce resistance to water-flow and injection pressure, improve super
Hypotonic and compact oil reservoir flood effectiveness.The prior art in the art mostly use nano particle and surfactant compound system and
Microemulsion system, scene needs that nano particle is induced to separate with surfactant when using to be demulsified with microemulsion, increases operation
Complexity and product price, and surfactant is the physics in scour process by physical action stabilized scattering nano particle
Effect is destroyed, and causes nano material aggregation sedimentation serious.
(4) nano-fluid preparation process of the invention is simple, dispersion is uniform, stability is good, there is good increasing injection, infiltration
Suction oil and the effect for improving recovery ratio, are easy to extemporaneous preparation and large-scale application.
Detailed description of the invention
Fig. 1 is the carbon nano-particle grain size distribution in embodiment 1 in carbon nanofluid；
Fig. 2 is the schematic diagram that environment pH influences carbon nano-particle surface group property prepared by the present invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
A kind of water base carbon nanofluid, is made of carbon nano-particle and alkaline aqueous solution, wherein the quality of carbon nano-particle
Percentage is 0.001%~5%, and the alkaline aqueous solution pH is 8~12, and the solute in the alkaline aqueous solution is hydroxide
Sodium, potassium hydroxide, sodium carbonate, one hydration ammonia, sodium phosphate, disodium-hydrogen, sodium dihydrogen phosphate, potassium phosphate, potassium phosphate,monobasic and
The combination of one or more of potassium dihydrogen phosphate, the dispersion particle diameter of the carbon nano-particle are 5~20nm.
The preparation method of the carbon nano-particle includes the following steps:
(1) by organic acid, exothermic agent and the uniform hybrid reaction of water, until being cooled to room temperature, the first reaction system is obtained；
(2) solid in first reaction system washed, separated, the washing, the process separated repeat four
Secondary, wherein separation process is dried in vacuo for 24 hours by the way of centrifugation or filtering, at 50 DEG C, finally obtains the carbon nano-particle.
The weight ratio of organic acid, exothermic agent and water in the step (1) are as follows: 10~100:25~250:1~10；It is described
Organic acid in step (1) is the combination of one or more of small molecule acid and unsaturated fatty acid；The small molecule acidification
Formula is CH3(CH2)nCOOH, wherein 0≤n≤3, n are integer；The unsaturated fatty acid chemical formula is CH3(CH2)aHC=
CH(CH2)bCOOH or CH3(CH2)cHC=CH (CH2)dHC=CH (CH2)eCOOH or CH3(CH2)fHC=CH (CH2)gHC=CH
(CH2)hHC=CH (CH2)iCOOH, wherein 1≤a≤10,1≤b≤10,1≤c≤5,1≤d≤5,1≤e≤5,1≤f≤4,
1≤g≤4,1≤h≤4,1≤i≤4, a, b, c, d, e, f, g, h and i are integer；Exothermic agent in the step (1) is oxidation
The combination of one or more of sodium, potassium oxide, calcium oxide and phosphorus pentoxide.
As described in Figure 2, carbon nano-particle surface prepared by the present invention makes its surface wettability can be with carboxylic acid group
The variation of environment pH and change, so that the hydrophilic and hydrophobic of nano particle is changed according to the needs of different situations, on the one hand exist
In alkaline environment, nano particle self-dispersed stability in water can be enhanced can uniformly be adsorbed on after injecting stratum
Reservoir rock surface will not occur to assemble and be produced from loss, on the other hand can be subsequent so as to cause adsorption efficiency reduction
Injection in, environmental pH reduces, and hydrophily becomes hydrophobicity, and nano adsorption layer reduces the work of adhesion of water phase, so that nanometer
Adsorption layer reduces the work of adhesion of water phase, and then achievees the purpose that reduce resistance to water-flow and injection pressure, improves Oil in Super-low Permeability and cause
The flood effectiveness of close oil reservoir.
Embodiment 1
By 10g CH3COOH, 25g sodium oxide molybdena and the uniform hybrid reaction of 1g water, are cooled to room temperature, obtain the first reactant
System, the solid in first reaction system is washed with water, is centrifuged, after being repeated 4 times, is dried in vacuo for 24 hours at 50 DEG C, obtains carbon
Nano particle.
It weighs carbon nano-particle made from 0.01g to be scattered in the sodium hydrate aqueous solution of 99.99g pH=8, can obtain
To the water base carbon nanofluid.
Using carbon nano-particle particle diameter distribution in laser particle size analyzer measurement nano-fluid, as shown in Figure 1, carbon carbon nanometer
5~20nm of particle size distribution range.
Embodiment 2
By 20g CH3CH2CH2COOH, 50g potassium oxide and the uniform hybrid reaction of 2g water, are cooled to room temperature, obtain first
Solid in first reaction system is washed with water, filters by reaction system, after being repeated 4 times, is dried in vacuo at 50 DEG C for 24 hours,
Obtain carbon nano-particle.
It weighs carbon nano-particle made from 0.1g to be scattered in the potassium hydroxide aqueous solution of 99.9g pH=10, can be obtained
The water base carbon nanofluid.
Utilize carbon nano-particle particle diameter distribution in laser particle size analyzer measurement nano-fluid, carbon nano-particle particle diameter distribution
6~18nm of range.
Embodiment 3
By 50g CH3CH2CH2COOH, 150g phosphorus pentoxide and the uniform hybrid reaction of 6g water, are cooled to room temperature, obtain
Solid in first reaction system is washed with water, is centrifuged by the first reaction system, after being repeated 4 times, is dried in vacuo at 50 DEG C
For 24 hours, carbon nano-particle is obtained.
It weighs carbon nano-particle made from 1g and is scattered in 99g pH=9 potassium hydroxide and sodium dihydrogen phosphate mixed aqueous solution
In, the water base carbon nanofluid can be obtained.
Utilize carbon nano-particle particle diameter distribution in laser particle size analyzer measurement nano-fluid, carbon nano-particle particle diameter distribution
4~21nm of range.
Embodiment 4
By 50g CH3(CH2)6HC=CH (CH2)6COOH, 200g phosphorus pentoxide and the uniform hybrid reaction of 9g water, it is to be cooled
To room temperature, the first reaction system is obtained, the solid in first reaction system is washed with water, is filtered, after being repeated 3 times, 50
It is dried in vacuo at DEG C for 24 hours, obtains carbon nano-particle.
Weigh carbon nano-particle made from 0.1g be scattered in 99.9g pH=10 potassium hydroxide mixed with sodium hydroxide it is water-soluble
In liquid, the water base carbon nanofluid can be obtained.
Utilize carbon nano-particle particle diameter distribution in laser particle size analyzer measurement nano-fluid, carbon nano-particle particle diameter distribution
7~17nm of range.
Embodiment 5
By 20g CH3CH2HC=CH (CH2)2HC=CH (CH2)2COOH, 50g potassium oxide and the uniform hybrid reaction of 9g water, to
It is cooled to room temperature, obtains the first reaction system, the solid in first reaction system is washed with water, is centrifuged, is repeated 4 times
Afterwards, it is dried in vacuo for 24 hours at 50 DEG C, obtains carbon nano-particle.
It weighs carbon nano-particle made from 0.01g to be scattered in the sodium phosphate aqueous solution of 99.99g pH=8, can be obtained
The water base carbon nanofluid.
Utilize carbon nano-particle particle diameter distribution in laser particle size analyzer measurement nano-fluid, carbon nano-particle particle diameter distribution
5~20nm of range.
Embodiment 6
By 10g CH3CH2HC=CHCH2HC=CHCH2HC=CHCH2COOH, 50g phosphorus pentoxide and 5g water uniformly mix
Reaction, is cooled to room temperature, obtains the first reaction system, the solid in first reaction system is washed with water, is filtered, weight
After 4 times multiple, it is dried in vacuo at 50 DEG C for 24 hours, obtains carbon nano-particle.
Weighing carbon nano-particle made from 0.005g, to be scattered in 99.995g pH=11 sodium hydroxide and potassium dihydrogen phosphate mixed
In Heshui solution, the water base carbon nanofluid can be obtained.
Utilize carbon nano-particle particle diameter distribution in laser particle size analyzer measurement nano-fluid, carbon nano-particle particle diameter distribution
6~21nm of range.
Embodiment 7
By 5g CH3COOH、5g CH3(CH2)6HC=CH (CH2)6COOH, 50g phosphorus pentoxide and 5g water uniformly mix instead
It answers, is cooled to room temperature, obtain the first reaction system, the solid in first reaction system is washed with water, is filtered, repeat
After 4 times, it is dried in vacuo at 50 DEG C for 24 hours, obtains carbon nano-particle.
Weighing carbon nano-particle made from 0.005g, to be scattered in 99.995g pH=11 sodium hydroxide and potassium dihydrogen phosphate mixed
In Heshui solution, the water base carbon nanofluid can be obtained.
Utilize carbon nano-particle particle diameter distribution in laser particle size analyzer measurement nano-fluid, carbon nano-particle particle diameter distribution
7~23nm of range.
Embodiment 8
By 10g CH3COOH, 40g phosphorus pentoxide, 10g calcium oxide and the uniform hybrid reaction of 5g water, are cooled to room temperature,
The first reaction system is obtained, the solid in first reaction system is washed with water, is filtered, after being repeated 4 times, vacuum at 50 DEG C
Drying for 24 hours, obtains carbon nano-particle.
It weighs carbon nano-particle made from 0.005g to be scattered in 99.995g pH=10 sodium hydrate aqueous solution, can obtain
To the water base carbon nanofluid.
Utilize carbon nano-particle particle diameter distribution in laser particle size analyzer measurement nano-fluid, carbon nano-particle particle diameter distribution
4~18nm of range.
Embodiment 9
By 5g CH3COOH、5g CH3CH2COOH, 50g phosphorus pentoxide and the uniform hybrid reaction of 5g water, are cooled to room
Temperature obtains the first reaction system, and the solid in first reaction system is washed with water, is filtered, after being repeated 4 times, at 50 DEG C
Vacuum drying for 24 hours, obtains carbon nano-particle.
It weighs carbon nano-particle made from 0.005g to be scattered in 99.995g pH=10 sodium hydrate aqueous solution, can obtain
To the water base carbon nanofluid.
Utilize carbon nano-particle particle diameter distribution in laser particle size analyzer measurement nano-fluid, carbon nano-particle particle diameter distribution
5~21nm of range.
Embodiment 10
By 5g CH3(CH2)6HC=CH (CH2)6COOH、5g CH3CH2HC=CHCH2HC=CHCH2HC=CHCH2COOH、
50g phosphorus pentoxide and the uniform hybrid reaction of 5g water, are cooled to room temperature, obtain the first reaction system, and described first is reacted
Solid in system is washed with water, filters, and after being repeated 4 times, is dried in vacuo for 24 hours at 50 DEG C, obtains carbon nano-particle.
It weighs carbon nano-particle made from 0.005g to be scattered in 99.995g pH=11 sodium hydrate aqueous solution, can obtain
To the water base carbon nanofluid.
Utilize carbon nano-particle particle diameter distribution in laser particle size analyzer measurement nano-fluid, carbon nano-particle particle diameter distribution
Range
7~27nm.
Test case 1
Take gas permeability in the Oil in Super-low Permeability natural core of 2.1mD, saturation simulation oil (viscosity 2mPas, 25 DEG C) uses mould
Quasi- 30 pore volume (PV) of water (3wt% potassium chloride salt water) displacement after establishing residual oil, measures the water injection pressure P after stablizing1,
Then by the nano fluid injection rock core in the embodiment of 1PV 3, under room temperature after aging for 24 hours, continue injection molding and intend water, record is stablized
Water injection pressure P afterwards2.After the processing of increasing injection nano fluid, by formula: decompression rate=(P1-P2)/P1× 100% calculates,
Water injection pressure decline 31% shows that the increasing injection nano fluid has good increasing injection effect.
Test case 2
Take gas permeability in the fine and close natural core of 0.1mD, saturation simulation oil (viscosity 1mPas, 25 DEG C), with simulation
30 pore volume (PV) of water (3wt% potassium chloride salt water) displacement after establishing residual oil, measures the water injection pressure P after stablizing1, so
Afterwards by the nano fluid injection rock core in the embodiment of 1PV 4, under room temperature after aging for 24 hours, continues injection molding and intend water, after record is stablized
Water injection pressure P2.After the processing of increasing injection nano fluid, by formula: decompression rate=(P1-P2)/P1× 100% calculates, note
Water pressure decline 26% shows that the increasing injection nano fluid has good increasing injection effect.
Test case 3
Take gas permeability in the fine and close natural core of 0.5mD, saturation simulation oil (viscosity 1mPas, 25 DEG C), with simulation
30 pore volume (PV) of water (3wt% potassium chloride salt water) displacement after establishing residual oil, measures the water injection pressure P after stablizing1, so
Afterwards by the nano fluid injection rock core in the embodiment of 1PV 6, under room temperature after aging for 24 hours, continues injection molding and intend water, after record is stablized
Water injection pressure P2.After the processing of increasing injection nano fluid, by formula: decompression rate=(P1-P2)/P1× 100% calculates, note
Water pressure decline 26% shows that the increasing injection nano fluid has good increasing injection effect.
Test case 4
Taking 12 block lengths is 4cm, diameter is the similar Oil in Super-low Permeability natural core of 2.5cm permeability, cleaning rock core, at 90 DEG C
Vacuum drying for 24 hours after, gas permeability be divided into 2.3mD, 2.2mD, 2.3mD, 2.1mD, 2.4mD, 1.8mD, 2.3mD, 2.2mD,
2.0mD and 2.1mD, saturation simulation oil (viscosity 2mPas, 25 DEG C), after aging for 24 hours, record saturation oil mass；By above-mentioned 5 blocks of rocks
The heart is put into imbibition bottle, is separately immersed in that concentration is 3wt% potassium chloride salt water, concentration is 0.1wt% neopelex
In nano-fluid in surfactant solution, Examples 1 to 6, the oil extraction at any time in different imbibition liquid of 8 blocks of rock cores is recorded
Amount, until oil drain quantity no longer changes, records final oil drain quantity, the recovery ratio for calculating separately 8 kinds of imbibition liquid is respectively 13.2%,
18.6%, 30.1%, 29.2%, 33.2%, 28.7%, 30.0%, 29.1%, 27.1%, 24.2%, 28.7% and
33.8%, nano-fluid improves 10% or more compared to surfactant solution.
Test case 5
Taking 12 block lengths is 2.5cm, diameter is the similar Oil in Super-low Permeability natural core of 2.5cm permeability, cleaning rock core, 90 DEG C
It is lower vacuum drying for 24 hours after, gas permeability be divided into 0.2mD, 0.2mD, 0.1mD, 0.1mD, 0.1mD, 0.2mD, 0.2mD,
0.2mD, 0.1mD, 0.1mD, 0.2mD and 0.1mD, saturation simulation oil (viscosity 1mPas, 25 DEG C), after aging for 24 hours, record is full
And oil mass；Above-mentioned 5 blocks of rock cores are put into imbibition bottle, are separately immersed in that concentration is 3wt% potassium chloride salt water, concentration is
In nano-fluid in 0.1wt% neopelex surfactant solution, Examples 1 to 10, records 8 blocks of rock cores and exist
Oil drain quantity records final oil drain quantity until oil drain quantity no longer changes at any time in different imbibition liquid, calculates separately 8 kinds of imbibitions
The recovery ratio of liquid is respectively 6.2%, 10.6%, 23.1%, 26.2%, 30.2%, 24.7%, 31.2%, 27.8%,
25.2%, 28.1%, 24.2% and 21.8%, nano-fluid improves 10% or more compared to surfactant solution.
The above test case shows water base carbon nanofluid of the present invention to Oil in Super-low Permeability and compact oil reservoir increasing injection and mentions
High recovery rate has good effect, fine and close and Oil in Super-low Permeability natural core water injection pressure can be made to reduce by 26% or more, compared to table
Face activator solution can make oil recovery factor improve 10% or more.And water base carbon nanofluid preparation process pole of the present invention
It is simple, need to can just prepare phase by dispersing agent and dispersing apparatus (stirring or ultrasound etc.) compared to the prior art in the art
Answer nano-fluid.Water base carbon nanofluid of the present invention can not by any equipment, directly make at the scene dispersion it is uniform,
The good water-based nano-fluid of stability, is greatly saved transport, manpower and equipment cost, therefore is easy to extemporaneous preparation and extensive
Using.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the range for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of water base carbon nanofluid, characterized in that be made of carbon nano-particle and alkaline aqueous solution, wherein carbon nano-particle
Mass percent be 0.001%~5%.
2. a kind of water base carbon nanofluid as described in claim 1, characterized in that the alkaline aqueous solution pH is 8~12.
3. a kind of water base carbon nanofluid as described in claim 1, characterized in that the solute in the alkaline aqueous solution is hydrogen
Sodium oxide molybdena, potassium hydroxide, sodium carbonate, hydration an ammonia, sodium phosphate, disodium-hydrogen, sodium dihydrogen phosphate, potassium phosphate, one hydrogen of phosphoric acid
The combination of one or more of potassium and potassium dihydrogen phosphate.
4. a kind of water base carbon nanofluid as described in claim 1, characterized in that the dispersion particle diameter of the carbon nano-particle is
5~20nm.
5. a kind of water base carbon nanofluid as described in claim 1, characterized in that the preparation method packet of the carbon nano-particle
Include following steps:
(1) by organic acid, exothermic agent and the uniform hybrid reaction of water, until being cooled to room temperature, the first reaction system is obtained；
(2) solid in first reaction system washed, separated, then dried, finally obtain the carbon nanometer
Grain.
6. a kind of water base carbon nanofluid as claimed in claim 5, characterized in that organic acid, heat release in the step (1)
The weight ratio of agent and water are as follows: 10~100:25~250:1~10.
7. a kind of water base carbon nanofluid as claimed in claim 5, characterized in that the organic acid in the step (1) is small
The combination of one or more of molecule acid and unsaturated fatty acid；The small molecule acid chemical formula is CH3(CH2)nCOOH,
In, 0≤n≤3, n are integer；The unsaturated fatty acid chemical formula is CH3(CH2)aHC=CH (CH2)bCOOH or CH3(CH2)cHC=CH (CH2)dHC=CH (CH2)eCOOH or CH3(CH2)fHC=CH (CH2)gHC=CH (CH2)hHC=CH (CH2)iCOOH,
Wherein, 1≤a≤10,1≤b≤10,1≤c≤5,1≤d≤5,1≤e≤5,1≤f≤4,1≤g≤4,1≤h≤4,1≤i≤
4, a, b, c, d, e, f, g, h and i are integer.
8. a kind of water base carbon nanofluid as claimed in claim 5, characterized in that the exothermic agent in the step (1) is oxygen
Change the combination of one or more of sodium, potassium oxide, calcium oxide and phosphorus pentoxide.
9. a kind of water base carbon nanofluid as claimed in claim 5, characterized in that anti-by described first in the step (2)
Answer the solid in system to be washed, the process that separates is repeated 4 times, separate mode is centrifugation or filtering, drying condition 50
It is dried in vacuo for 24 hours at DEG C.
10. such as a kind of described in any item preparation methods of water base carbon nanofluid of claim 1-9, characterized in that will be above-mentioned
The carbon nano-particle of ratio is scattered in the alkaline aqueous solution of pH=8-12, and the water base carbon nanofluid can be obtained.
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