CN106221873B - A kind of preparation method of rare earth diesel engine oil - Google Patents
A kind of preparation method of rare earth diesel engine oil Download PDFInfo
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- CN106221873B CN106221873B CN201610562158.7A CN201610562158A CN106221873B CN 106221873 B CN106221873 B CN 106221873B CN 201610562158 A CN201610562158 A CN 201610562158A CN 106221873 B CN106221873 B CN 106221873B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
- C10M169/048—Mixtures of base-materials and additives the additives being a mixture of compounds of unknown or incompletely defined constitution, non-macromolecular and macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
- C10M125/10—Metal oxides, hydroxides, carbonates or bicarbonates
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
- C10M129/04—Hydroxy compounds
- C10M129/10—Hydroxy compounds having hydroxy groups bound to a carbon atom of a six-membered aromatic ring
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
- C10M129/68—Esters
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
- C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
- C10M133/16—Amides; Imides
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
- C10M135/20—Thiols; Sulfides; Polysulfides
- C10M135/28—Thiols; Sulfides; Polysulfides containing sulfur atoms bound to a carbon atom of a six-membered aromatic ring
- C10M135/30—Thiols; Sulfides; Polysulfides containing sulfur atoms bound to a carbon atom of a six-membered aromatic ring containing hydroxy groups; Derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
- C10M137/12—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having a phosphorus-to-carbon bond
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M155/00—Lubricating compositions characterised by the additive being a macromolecular compound containing atoms of elements not provided for in groups C10M143/00 - C10M153/00
- C10M155/02—Monomer containing silicon
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M159/00—Lubricating compositions characterised by the additive being of unknown or incompletely defined constitution
- C10M159/02—Natural products
- C10M159/06—Waxes, e.g. ozocerite, ceresine, petrolatum, slack-wax
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/04—Detergent property or dispersant property
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/25—Internal-combustion engines
- C10N2040/252—Diesel engines
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Lubricants (AREA)
Abstract
The present invention relates to a kind of preparation methods of rare earth diesel engine oil, defoaming agent, dispersing agent are added in kerosene, after mixing evenly, nano rare earth is added in the state of high speed shear, after being fully dispersed in nano rare earth in kerosene, antioxidant, base oil and microwax is added, distills certain time under certain pressure, temperature, high speed shear state, the kerosene that cooling recycling distills out, the product after distillation is rare earth diesel engine oil.The product makes engine close to zero abrasion, extends the service life of engine, and forms superpower oil film, keeps oil pressure long-time stable, and oil drain interval breaches the oil draining period of general machine oil.
Description
Technical field
The present invention relates to a kind of preparation methods of rare earth diesel engine oil.
Background technique
Ordinary diesel oil machine oil undermines anti-oxidant aspect effect and does not protrude wear-resistant currently on the market, and effect preferable one
As for addition fluoride, fluoride has certain pollution to environment, and it is good to lack a kind of pair of gear protecting effect, environmental-friendly
And product with long service life.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of preparation method of rare earth diesel engine oil, the present invention stablizes
Property it is good, have excellent anti-friction and corrosion resistance.
In order to solve the above-mentioned technical problem, the invention adopts the following technical scheme:
A kind of preparation method of rare earth diesel engine oil, it is characterised in that follow the steps below:
1) it prepares product A: defoaming agent, dispersing agent and kerosene is added to height according to 0.5~3:0.5 of mass ratio~3:1000
It in shearing equipment, stirs evenly, obtains product A；
2) it prepares product B: being added to nano rare earth in product A according to certain mass ratio in the state of high speed shear,
The mass ratio of nano rare earth and product A are 1~25:75~99, obtain product B；
3) it prepares products C: base oil, antioxidant and wax is added in product B according to certain mass ratio, stir complete to wax
Fully dissolved, base oil, antioxidant, wax and product B mass ratio be 80~97:1~5:1~5:0.5~10, obtain products C；
4) it prepares rare earth diesel engine oil: being -0.1MPa~-1.5MPa in pressure, temperature is 40 DEG C~80 DEG C, high speed shear
15min~60min is distilled under state, the kerosene that cooling recycling distills out, the product after distillation is rare earth diesel engine oil；
The defoaming agent be two kinds of one of Span-80, dimethicone and polymethylphenyl siloxane fluid or arbitrary proportion with
On；
The dispersing agent be triethyl group hexyl phosphoric acid, vinyl bis-stearamides, glyceryl monostearate, polyethylene glycol and
One of mono alkenyl succimide or arbitrary proportion it is two or more；
The nano rare earth be two kinds of one of yttria, ceria and lanthana or arbitrary proportion with
On；
The antioxidant be 2,6- three-level butyl -4- methylphenol, bis- (3,5- three-level butyl -4- hydroxy phenyl) thioethers,
Four (β-(3,5- three-level butyl -4- hydroxy phenyl) propionic acid) pentaerythritol esters, double Lauryl Alcohol esters, bi-myristoleyl and double ten
One of eight carbon alcohol esters or arbitrary proportion it is two or more；
The wax is the two or more of one of paraffin, microwax and beeswax or arbitrary proportion.
The revolving speed of the high speed shear is 1000 turns/min~5000 turn/min.
Defoaming agent is the composition of polymethylphenyl siloxane fluid and dimethicone according to mass ratio 1:2 in step 1)；Dispersing agent is
Triethyl group hexyl phosphoric acid and vinyl bis-stearamides according to mass ratio 3:1 composition；The matter of defoaming agent, dispersing agent and kerosene
Amount is than being 1.5:1:1000.
Step 2 high speed shearing rotating speed is 3000 turns/min；Nano rare earth is yttria, ceria and oxidation
Lanthanum according to mass ratio 1:3:3 composition；The mass ratio of nano rare earth and product A are 20:80.
Wax is the composition of beeswax and paraffin according to mass ratio 1:1 in step 3)；Antioxidant is 2,6- three-level butyl -4- first
Base phenol, bis- (3,5- three-level butyl -4- hydroxy phenyl) thioethers and double Lauryl Alcohol esters are according to the composition of mass ratio 2:1:1；
Base oil, antioxidant, wax and product B mass ratio be 90:5:2:3.
Pressure is -1.0MPa in step 4), and temperature is 65 DEG C, and high speed shear revolving speed is 3000 turns/min, and shear time is
30min。
The present invention has following advantageous effects:
1), nano rare earth stable dispersion is suspended in diesel engine oil by the present invention by the method for physics and chemistry, will not
Flocculation and deposition.
2), the present invention is adhered to metal surface in use, superpower oil film can be formed, and forms " the oil plating " of similar polishing,
There is certain repair to the component for having abrasion.
3), the addition of rare earth and antioxidant of the present invention can obviously increase the rub resistance of diesel engine oil, and extend diesel oil
The service life of machine oil.
4), the present invention is close to zero the frictional resistance between gear, and the output power of engine can be made to reach maximum
Value reduces oil consumption, also has certain effect at energy saving aspect.
5), the present invention select rare earth oxide as modifying agent, compared with rare earth fluoride will not environmental-protecting performance it is higher.
6), the present invention distills the kerosene of low molecular weight, can prevent diesel oil adstante febre, and kerosene evaporation falls within diesel oil
The certain positions of machine, the degradation of long-term accumulation kerosene cause to corrode to diesel engine.
Specific embodiment
The present invention is further illustrated below with reference to specific example.
Embodiment 1
Defoaming agent, dispersing agent and kerosene are added in High shear device according to mass ratio 1.5:1:1000, stirred evenly,
Obtain product A；In the state of 3000 turns/min high speed shear, nano rare earth is added in product A according to certain mass ratio,
The mass ratio of nano rare earth and product A are 20:80, obtain product B；Base oil, antioxidant and wax are added according to certain mass ratio
Enter into product B, base oil, antioxidant, wax and product B mass ratio be 90:5:2:3, stirring to wax is completely dissolved, in pressure
For -1.0MPa, temperature is 65 DEG C, and under the conditions of high speed shear revolving speed is 3000 turns/min, distillation shearing 30min, cooling recycling is steamed
The kerosene distillated, the product after distillation are rare earth diesel engine oil.
Embodiment 2
Defoaming agent, dispersing agent and kerosene are added in High shear device according to mass ratio 1.5:1:1000, stirred evenly,
Obtain product A；In the state of 3000 turns/min high speed shear, nano rare earth is added in product A according to certain mass ratio,
The mass ratio of nano rare earth and product A are 10:90, obtain product B；Base oil, antioxidant and wax are added according to certain mass ratio
Enter into product B, base oil, antioxidant, wax and product B mass ratio be 90:5:2:3, stirring to wax is completely dissolved, in pressure
For -1.0MPa, temperature is 65 DEG C, and under the conditions of high speed shear revolving speed is 3000 turns/min, distillation shearing 30min, cooling recycling is steamed
The kerosene distillated obtains rare earth diesel engine oil.
Embodiment 3
Defoaming agent, dispersing agent and kerosene are added in High shear device according to mass ratio 1.5:1:1000, stirred evenly,
Obtain product A；In the state of 3000 turns/min high speed shear, nano rare earth is added in product A according to certain mass ratio,
The mass ratio of nano rare earth and product A are 15:85, obtain product B；Base oil, antioxidant and wax are added according to certain mass ratio
Enter into product B, base oil, antioxidant, wax and product B mass ratio be 90:5:2:3, stirring to wax is completely dissolved, in pressure
For -1.0MPa, temperature is 65 DEG C, and under the conditions of high speed shear revolving speed is 3000 turns/min, distillation shearing 30min, cooling recycling is steamed
The kerosene distillated obtains rare earth diesel engine oil.
Embodiment 4
Defoaming agent, dispersing agent and kerosene are added in High shear device according to mass ratio 1.5:1:1000, stirred evenly,
Obtain product A；In the state of 3000 turns/min high speed shear, nano rare earth is added in product A according to certain mass ratio,
The mass ratio of nano rare earth and product A are 25:75, obtain product B；Base oil, antioxidant and wax are added according to certain mass ratio
Enter into product B, base oil, antioxidant, wax and product B mass ratio be 90:5:2:3, stirring to wax is completely dissolved, in pressure
For -1.0MPa, temperature is 65 DEG C, and under the conditions of high speed shear revolving speed is 3000 turns/min, distillation shearing 30min, cooling recycling is steamed
The kerosene distillated obtains rare earth diesel engine oil.
It is the combination of polymethylphenyl siloxane fluid and dimethicone according to mass ratio 1:2 that defoaming agent, which is defoaming agent, in embodiment 1 to 4
Object；Dispersing agent is the composition of triethyl group hexyl phosphoric acid and vinyl bis-stearamides according to mass ratio 3:1；Nano rare earth is three
Y 2 O, ceria and lanthana according to mass ratio 1:3:3 composition；Wax is beeswax and paraffin according to mass ratio 1:1
Composition；Antioxidant is 2,6- three-level butyl -4- methylphenol, bis- (3,5- three-level butyl -4- hydroxy phenyl) thioethers and double
Lauryl Alcohol ester according to mass ratio 2:1:1 composition.
Beneficial effects of the present invention are further illustrated below with reference to experimental data:
1, material to be tested is tested
1 materials and methods:
1.1 materials to be tested: the embodiment of the present invention 1, embodiment 2, embodiment 3, embodiment 4 and ordinary diesel oil machine oil is not (except
Plus nano rare earth and distill out outside kerosene, other production methods are same as Example 1) it does effect and compares.
1.2 experimental designs: test sets 5 processing, does parallel.Take the embodiment 1 of same quality, embodiment 2, embodiment 3,
Embodiment 4 and ordinary diesel oil machine oil (in addition to except non-plus nano rare earth and distilling out kerosene, other production methods with 1 phase of embodiment
Uniformly it is applied to the diesel engine gas of 360 tractors of the coal yard for drawing 10 Weifang Tractor Factory, Shandong of coal to produce respectively together)
On cylinder and piston, comparatively tractor draws the weight of coal and transportation range roughly the same every time, to the gas of engine after 8 months
Cylinder and piston wear situation and oil consumption count.
This experiment is consistent except the different outer other conditions of the processing of use.
2 results and analysis
Embodiment 1, embodiment 2, embodiment 3, embodiment 4 and ordinary diesel oil machine oil (except non-plus nano rare earth and distill out
Outside kerosene, other production methods are same as Example 1) it handles and compares, as a result such as table 1.
Respectively influence of the processing to cylinder, piston erosion abrasion condition and oil consumption of table 1
| Cylinder wear situation (is observed) when 8000 km of normally travel | Piston wear situation (is observed) when 8000 km of normally travel | Oil consumption (L/100km) | |
| Embodiment 1 | Abrasion is not shown | Abrasion is not shown | 8.6 |
| Embodiment 2 | Show mild wear but unobvious | Show mild wear but unobvious | 8.9 |
| Embodiment 3 | Show mild wear but unobvious | Show mild wear but unobvious | 8.9 |
| Embodiment 4 | Show mild wear but unobvious | Show mild wear but unobvious | 9.0 |
| Regular gasoline machine oil | Display abrasion and it is more apparent | Display abrasion and it is more apparent | 9.8 |
Embodiment 1 is either wear-resistant or effect is more prominent in terms of saving oil consumption as can be seen from Table 1.
Claims (6)
1. a kind of preparation method of rare earth diesel engine oil, it is characterised in that follow the steps below:
1) it prepares product A: defoaming agent, dispersing agent and kerosene is added to high shear according to 0.5~3:0.5 of mass ratio~3:1000
It in equipment, stirs evenly, obtains product A；
2) it prepares product B: being added to nano rare earth in product A according to certain mass ratio in the state of high speed shear, nanometer
The mass ratio of rare earth and product A are 20:80, obtain product B；
3) it prepares products C: base oil, antioxidant and wax is added in product B according to certain mass ratio, stir completely molten to wax
Solution, base oil, antioxidant, wax and product B mass ratio be 80~97:1~5:1~5:0.5~10, obtain products C；
4) it prepares rare earth diesel engine oil: being -0.1MPa~-1.5MPa in pressure, temperature is 40 DEG C~80 DEG C, high speed shear state
Lower distillation 15min~60min, the kerosene that cooling recycling distills out, the product after distillation is rare earth diesel engine oil；
The defoaming agent is the two or more of one of Span-80, dimethicone and polymethylphenyl siloxane fluid or arbitrary proportion；
The dispersing agent is triethyl group hexyl phosphoric acid, vinyl bis-stearamides, glyceryl monostearate, polyethylene glycol and monoene
One of base succimide or arbitrary proportion it is two or more；
The nano rare earth is the composition of yttria, ceria and lanthana according to mass ratio 1:3:3；
The antioxidant is 2,6- three-level butyl -4- methylphenol, bis- (3,5- three-level butyl -4- hydroxy phenyl) thioethers, four (β -
(3,5- three-level butyl -4- hydroxy phenyl) propionic acid) pentaerythritol ester, double Lauryl Alcohol esters, bi-myristoleyl and double 18 carbon
One of alcohol ester or arbitrary proportion it is two or more；
The wax is the two or more of one of paraffin, microwax and beeswax or arbitrary proportion.
2. the preparation method of rare earth diesel engine oil as described in claim 1, it is characterised in that: the revolving speed of the high speed shear is
1000 turns/min~5000 turn/min.
3. the preparation method of rare earth diesel engine oil as described in claim 1, it is characterised in that: defoaming agent is benzene first in step 1)
Base silicone oil and dimethicone according to mass ratio 1:2 composition；Dispersing agent is that triethyl group hexyl phosphoric acid and vinyl are double stearic
Amide according to mass ratio 3:1 composition；The mass ratio of defoaming agent, dispersing agent and kerosene is 1.5:1:1000.
4. the preparation method of rare earth diesel engine oil as described in claim 1, it is characterised in that: step 2 high speed shearing rotating speed
For 3000 turns/min.
5. the preparation method of rare earth diesel engine oil as described in claim 1, it is characterised in that: wax is beeswax and stone in step 3)
Wax according to mass ratio 1:1 composition；Antioxidant is 2,6- three-level butyl -4- methylphenol, bis- (3,5- three-level butyl -4- hydroxyls
Base phenyl) thioether and double Lauryl Alcohol esters according to mass ratio 2:1:1 composition；The matter of base oil, antioxidant, wax and product B
Amount is than being 90:5:2:3.
6. the preparation method of rare earth diesel engine oil as described in claim 1, it is characterised in that: in step 4) pressure be-
1.0MPa, temperature are 65 DEG C, and high speed shear revolving speed is 3000 turns/min, shear time 30min.
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| CN110951516A (en) * | 2019-12-25 | 2020-04-03 | 山东锦阳石油科技有限公司 | Application of nano rare earth (lanthanum) additive in lubricating oil |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820191A (en) * | 2014-01-14 | 2014-05-28 | 李亚东 | Gasoline engine oil |
| CN105296087A (en) * | 2015-10-22 | 2016-02-03 | 邵宏良 | Gasoline engine oil composition |
| CN105331436A (en) * | 2015-09-23 | 2016-02-17 | 黑龙江三维润滑油科技有限公司 | Lubricating oil and preparation method thereof |
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2016
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820191A (en) * | 2014-01-14 | 2014-05-28 | 李亚东 | Gasoline engine oil |
| CN105331436A (en) * | 2015-09-23 | 2016-02-17 | 黑龙江三维润滑油科技有限公司 | Lubricating oil and preparation method thereof |
| CN105296087A (en) * | 2015-10-22 | 2016-02-03 | 邵宏良 | Gasoline engine oil composition |
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