CN103173268B - Lubricating oil anti-wear agent and preparation method thereof - Google Patents
Lubricating oil anti-wear agent and preparation method thereof Download PDFInfo
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- CN103173268B CN103173268B CN201110428302.5A CN201110428302A CN103173268B CN 103173268 B CN103173268 B CN 103173268B CN 201110428302 A CN201110428302 A CN 201110428302A CN 103173268 B CN103173268 B CN 103173268B
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- lubricating oil
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- rare earth
- wear agent
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims description 5
- 239000010687 lubricating oil Substances 0.000 title abstract description 12
- 239000003921 oil Substances 0.000 claims abstract description 28
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 21
- -1 rare earth compound Chemical class 0.000 claims abstract description 18
- 239000002199 base oil Substances 0.000 claims abstract description 14
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims abstract description 11
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 7
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 7
- 238000005461 lubrication Methods 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical class CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 claims description 4
- 229920002367 Polyisobutene Polymers 0.000 claims description 4
- 230000007935 neutral effect Effects 0.000 claims description 4
- KDYFGRWQOYBRFD-UHFFFAOYSA-L succinate(2-) Chemical compound [O-]C(=O)CCC([O-])=O KDYFGRWQOYBRFD-UHFFFAOYSA-L 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 11
- 239000011574 phosphorus Substances 0.000 abstract description 11
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 11
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 239000011593 sulfur Substances 0.000 abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 abstract description 4
- 239000003518 caustics Substances 0.000 abstract description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 239000000725 suspension Substances 0.000 abstract description 2
- 239000002270 dispersing agent Substances 0.000 abstract 1
- 230000036314 physical performance Effects 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 239000000654 additive Substances 0.000 description 16
- 230000000996 additive effect Effects 0.000 description 16
- 230000003449 preventive effect Effects 0.000 description 11
- 239000005864 Sulphur Substances 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910052684 Cerium Inorganic materials 0.000 description 3
- 229910052692 Dysprosium Inorganic materials 0.000 description 3
- 229910052691 Erbium Inorganic materials 0.000 description 3
- 229910052693 Europium Inorganic materials 0.000 description 3
- 229910052688 Gadolinium Inorganic materials 0.000 description 3
- 229910052689 Holmium Inorganic materials 0.000 description 3
- 229910052765 Lutetium Inorganic materials 0.000 description 3
- 229910052779 Neodymium Inorganic materials 0.000 description 3
- 229910052777 Praseodymium Inorganic materials 0.000 description 3
- 229910052773 Promethium Inorganic materials 0.000 description 3
- 229910052772 Samarium Inorganic materials 0.000 description 3
- 229910052771 Terbium Inorganic materials 0.000 description 3
- 229910052775 Thulium Inorganic materials 0.000 description 3
- 229910052769 Ytterbium Inorganic materials 0.000 description 3
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 description 3
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 description 3
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 3
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 description 3
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 3
- KJZYNXUDTRRSPN-UHFFFAOYSA-N holmium atom Chemical compound [Ho] KJZYNXUDTRRSPN-UHFFFAOYSA-N 0.000 description 3
- 229910052746 lanthanum Inorganic materials 0.000 description 3
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- OHSVLFRHMCKCQY-UHFFFAOYSA-N lutetium atom Chemical compound [Lu] OHSVLFRHMCKCQY-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 3
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 3
- VQMWBBYLQSCNPO-UHFFFAOYSA-N promethium atom Chemical compound [Pm] VQMWBBYLQSCNPO-UHFFFAOYSA-N 0.000 description 3
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 3
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 description 3
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 3
- 231100001010 corrosive Toxicity 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 239000005069 Extreme pressure additive Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
Landscapes
- Lubricants (AREA)
Abstract
The invention discloses a lubricating oil anti-wear agent. The lubricating oil anti-wear agent comprises 65-80% by mass of base oil, 2-5% by mass of a rare earth compound, 2-5% by mass of liquid sodium polyacrylate, 5-10% by mass of an antioxidant, and 10-20% by mass of a dispersant. The lubricating oil anti-wear agent uses the unique chemical and physical performances of the rare earth compound, so the wear and extreme pressure resistances of oil are greatly improved; ionic bond exchange between sodium polyacrylate contained in the lubricating oil anti-wear agent and the surface of a metal facility is carried out, so a magnetic suspension effect is generated, and the part wearing is reduced; and no corrosive substances comprising sulfur or phosphorus are contained, so the lubricating oil anti-wear agent has no damages to parts, and does not cause environmental pollution.
Description
Technical field
The present invention relates to lubricating oil field, particularly relate to a kind of lubrication oil antiwear agent.
Background technology
In traditional lubrication theory, be divided into liquid lubrication and boundary lubrication lubricating.The complete lubricated oil film in two metallic surfaces of doing relative movement separates, and there is no the direct contact of metal, and this lubricating status is called liquid lubrication; Along with the increase of load, the attenuate gradually of the oil film thickness between metallic surface, when load increases to a certain degree, continuous oil film is destroyed by the summit of metallic surface, the local direct contact producing between metallic surface, this lubricating status is called boundary lubrication.In boundary lubrication, in the time that moderate duty is only born in metallic surface, if any a kind of additive can be attracted on metallic surface or with metallic surface sharp wear, this additive is called wear preventive additive.
Along with the continuous fast development of automotive industry and other each industrial circle, also more and more harsher to the wear preventive additive of traditional sense.Initial wear preventive additive mainly all contains the corrosives such as sulphur, phosphorus, and life-time service is harmful to parts itself; Meanwhile, contain sulphur, phosphorus has increased the noxious emission to environment.The ILSAC GF-4 of American Petroleum Institute (API) (API) regulation automobile engine oil requires phosphorus content must not exceed 0.08%, and sulphur content must not exceed 0.5% (5W/XY oil) and 0.7% (10W/XX oil); Within 2009, obtain more being controlled at below 0.05% phosphorus of GF-5 automobile engine oil.ILSAC specified requirement further improves the resistance to abrasion of oil product under the prerequisite that reduces sulphur and phosphorus content, and therefore this is that main lubricating oil additive has formed significant challenge to sulphur, phosphorus.
Along with the development of wear preventive additive, a kind of metal nano wear preventive additive that contains nano metal compound composition had produced in the last few years, this wear preventive additive not only has good performance aspect resistance to abrasion, also overcome the impact on environment simultaneously, but it has two aspect deficiencies: the one, and nano-solution belongs to suspension technology, be configured to after liquid, still be a kind of unsettled liquid, long-time placement there will be stratification effect, add its dispersiveness in lubricating oil to remain larger defect, therefore this technology needs further to be improved simultaneously; The 2nd, Nano metal powder, nano-ceramic powder, on parts, engine moving parts surface, life-time service can produce nanoparticle aggregate, this nanometer buildup effect is carried out for a long time, nano particle is cumulative, is deposited as macrobead, can produce new wearing and tearing, scuffing of cylinder bore to parts.
Therefore, seek a kind of sulfur-bearing, phosphorus amount is little, and resistance to abrasion is excellent, the lubrication oil antiwear agent of good stability becomes industry problem demanding prompt solution.
Summary of the invention
The present invention, in order to address the above problem, provides not sulfur-bearing, phosphorus of one, and resistance to abrasion is good, and anti-extreme pressure is good, the lubrication oil antiwear agent of stability and good dispersity.
To achieve these goals, technical scheme provided by the present invention is: a kind of lubrication oil antiwear agent, comprises the component of following mass percent:
Further, described rare earth compound is R
xo
yor R (NO
3)
x, wherein R is the one in lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium.
Further, described base oil is 500SN base oil or paraffinic base neutral oil.
Further, described base oil is 28.8-40.2mm the kinematic viscosity of 40 DEG C
2/ s.
Further, described sodium polyacrylate is that molecular weight is the liquid sodium polyacrylate of 2000-3000.
Further, described antioxidant is polyisobutene succinate.
Further, described dispersion agent is seasons four amylalcohols.
Further, described rare earth compound is water-solubility rare-earth compound.
Further, comprise the steps:
1) dispersion agent that is 10%～20% by above-mentioned mass percent is placed in reactor 1, and adding wherein while stirring above-mentioned mass percent is 2%～5% rare earth compound, and then 50～60 DEG C of stirring in water bath to rare earth compounds dissolve completely;
2) base oil that is 65%～80% by above-mentioned mass percent is placed in reactor 2, and adding wherein while stirring above-mentioned mass percent is 2%～5% sodium polyacrylate, stirs;
3) above-mentioned reactor 1 gained mixture is added in reactor 2, finally adding above-mentioned mass percent was 2%～5% antioxidant, 50～60 DEG C of stirring in water bath 30 minutes.
Adopt technique scheme, technique effect of the present invention has: the present invention has applied chemistry and the physicals of rare earth compound uniqueness, and it is well incorporated in lubricating oil, raising energetically the wear-resistant anti-extreme pressure energy of oil product; , under certain temperature and pressure, there is ionic linkage exchange with metal facility surface in the sodium polyacrylate that this invention contains simultaneously, make the metallic surface of phase mutual friction all with positive charge, two like magnetic poles repel each other, parts non-direct contact, finally produce the floating effect of magnetic, thereby reduce friction, reduce component wear, improve power and export and reduce fuel oil loss, and the corrosives such as sulfur-bearing, phosphorus not, to not infringement of parts itself, do not produce environmental pollution.
Embodiment
The following describes the specific embodiment of the present invention.
Embodiment 1
A kind of lubrication oil antiwear agent that comprises following mass percent component:
Preparation method is as follows: the dispersion agent of weight part 10%～20% is placed in to reactor 1, adds wherein while stirring the rare earth compound of weight part 2%～5%, dissolve completely at 50～60 DEG C of stirring in water bath to rare earth compounds; Then base oil weight part 65%～80% is placed in to reactor 2, adds wherein while stirring the sodium polyacrylate of weight part 2%～5%, stir; Above-mentioned reactor 1 gained mixture is added in reactor 2, finally add the antioxidant of weight part 2%～5%, 50～60 DEG C of stirring in water bath 30 minutes.
Embodiment 2
A kind of lubrication oil antiwear agent, its component and mass percent are:
Wherein, R is the one in lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium.
A kind of lubrication oil antiwear agent, its preparation method is as follows: by the seasons of weight part 10%～20% four amylalcohol be placed in reactor 1, add wherein while stirring the water-solubility rare-earth compound R of weight part 2%～5%
xo
y, RCl
x, R (NO
3)
x, wherein, R is the one in lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, dissolves completely at 50～60 DEG C of stirring in water bath to water-solubility rare-earth compound; Then the 500SN base oil of weight part 65%～80% or paraffinic base neutral oil are placed in to reactor 2, the liquid sodium polyacrylate that the molecular weight ranges that adds wherein while stirring weight part 2%～5% is 2000-3000, stirs; Above-mentioned reactor 1 gained mixture is added in reactor 2, finally add the polyisobutene succinate of weight part 2%～5%, 50～60 DEG C of stirred in water bath 30 minutes.
Be below concrete component and the proportioning of the present invention:
Component and the proportioning (mass percent) of the floating wear preventive additive of liquid crystal magnetic
base oil is selected 500SN base oil or paraffinic base neutral oil, and the kinematic viscosity of 40 DEG C is 28.8-40.2mm
2/ s.
water-solubility rare-earth compound is R
xo
y, RCl
x, R (NO
3)
x, wherein.
antioxidant is polyisobutene succinate.
dispersion agent is seasons four amylalcohols.
proportioning is mass percent.
Compared with the technology of the present invention and wear preventive additive in the past, there is the feature of essence.The floating wear preventive additive of liquid crystal magnetic does not contain the material of the corrosion parts such as any sulphur, phosphorus and atmosphere pollution.This wear preventive additive is in the operation process of parts friction pair, be under certain temperature and pressure, the wherein floating active substance of magnetic and metal facility surface generation Na+ and Fe2+, the exchange of Fe3+ inequality, make friction pair all with positive charge, from microcosmic angle, two like magnetic poles repel each other, parts non-direct contact, thereby produce the floating effect of magnetic, greatly reduce friction and wear.With other metallographic phase ratios, the adhesion factor of rare earth metal is lower, and in vacuum or air, frictional coefficient and the wear rate of rare earth metal have notable difference, this is that it has 4f characteristic electron due to rare earth element, makes its element or compound have many special functions; Meanwhile, because the polar group of rare earth compound is adsorbed in metallic surface, so form a kind of protective membrane of low-friction coefficient, thereby effectively protected machine.Meanwhile, the floating wear preventive additive of this liquid crystal magnetic is applicable to the GB oil product of existing any model, kind, has good synergy with its collocation.
The steel ball that the general ZDDP extreme-pressure additive of this lubrication oil antiwear agent and market is produced with Faville-Le vally company in four-ball tester taking 150NS base oil as carrier carries out wear-resistant collaborative comparison, and result is as following table:
Can be found out by above-mentioned experimental result, lubrication oil antiwear agent has remarkable anti-extreme pressure and wear resistance as lubricating oil additive, is the additive for wear resistance of lubricating oil that a class has wide application prospect.
Finally it should be noted that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (5)
1. a lubrication oil antiwear agent, is characterized in that: the component that comprises following mass percent:
Described rare earth compound is water-solubility rare-earth compound; Described antioxidant is polyisobutene succinate; Described dispersion agent is seasons four amylalcohols.
2. lubrication oil antiwear agent according to claim 1, is characterized in that: described base oil is 500SN base oil or paraffinic base neutral oil.
3. lubrication oil antiwear agent according to claim 1, is characterized in that: described base oil is 28.8-40.2mm the kinematic viscosity of 40 DEG C
2/ s.
4. lubrication oil antiwear agent according to claim 1, is characterized in that: described sodium polyacrylate is that molecular weight is the liquid sodium polyacrylate of 2000-3000.
5. the preparation method of a kind of lubrication oil antiwear agent according to claim 1, is characterized in that: comprise the steps:
1) dispersion agent that is 10%～20% by above-mentioned mass percent, is placed in reactor 1, and adding wherein while stirring above-mentioned mass percent is 2%～5% rare earth compound, and then 50～60 DEG C of stirring in water bath to rare earth compounds dissolve completely;
2) base oil that is 65%～80% by above-mentioned mass percent is placed in reactor 2, and adding wherein while stirring above-mentioned mass percent is 2%～5% sodium polyacrylate, stirs;
3) above-mentioned reactor 1 gained mixture is added in reactor 2, finally adding above-mentioned mass percent was 5%～10% antioxidant, 50～60 DEG C of stirring in water bath 30 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110428302.5A CN103173268B (en) | 2011-12-20 | 2011-12-20 | Lubricating oil anti-wear agent and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110428302.5A CN103173268B (en) | 2011-12-20 | 2011-12-20 | Lubricating oil anti-wear agent and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN103173268A CN103173268A (en) | 2013-06-26 |
| CN103173268B true CN103173268B (en) | 2014-07-16 |
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|---|---|---|---|
| CN201110428302.5A Expired - Fee Related CN103173268B (en) | 2011-12-20 | 2011-12-20 | Lubricating oil anti-wear agent and preparation method thereof |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103555395B (en) * | 2013-10-24 | 2014-12-31 | 大连海事大学 | DCA5070 marine cylinder oil composition, preparation method and application thereof |
| CN103540388B (en) * | 2013-10-24 | 2014-12-31 | 大连海事大学 | FD bearing oil composition, preparation method and applications thereof |
| CN103601845B (en) * | 2013-11-04 | 2015-11-11 | 上海金兆节能科技有限公司 | Polyisobutene butene dioic acid ester and preparation method thereof and by this polyester for micro lubricating oil |
| CN106520271A (en) * | 2016-10-29 | 2017-03-22 | 张静 | High-dispersibility nano anti-grinding agent preparation method |
| CN107164033B (en) * | 2017-05-05 | 2019-12-06 | 山东沾化莱斯特石油化工有限公司 | Lubricating oil containing N-3-dimethylaminopropyl-perfluorohexyl sulfonamide and preparation method thereof |
| CN117801854A (en) * | 2022-09-30 | 2024-04-02 | 比亚迪股份有限公司 | Fuel oil detergent composition and preparation method thereof |
| CN116426329B (en) * | 2023-04-18 | 2024-07-26 | 河北金普石油科技有限公司 | Antiwear lubricating oil capable of enabling parts to form magnetic levitation state and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4507214A (en) * | 1983-11-02 | 1985-03-26 | Union Oil Company Of California | Rare earth halide grease compositions |
| CN1218103A (en) * | 1998-10-08 | 1999-06-02 | 中国科学院兰州化学物理研究所 | Nano size rare earth hydroxide lubricant oil additive |
| CN1320683A (en) * | 2000-04-26 | 2001-11-07 | 青岛立大集团股份有限公司 | Rare-earth additive of lubricating oil and its preparing process |
-
2011
- 2011-12-20 CN CN201110428302.5A patent/CN103173268B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4507214A (en) * | 1983-11-02 | 1985-03-26 | Union Oil Company Of California | Rare earth halide grease compositions |
| CN1218103A (en) * | 1998-10-08 | 1999-06-02 | 中国科学院兰州化学物理研究所 | Nano size rare earth hydroxide lubricant oil additive |
| CN1320683A (en) * | 2000-04-26 | 2001-11-07 | 青岛立大集团股份有限公司 | Rare-earth additive of lubricating oil and its preparing process |
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| CN103173268A (en) | 2013-06-26 |
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