CN115074169A - Lubricating grease and speed reducer and robot comprising same - Google Patents
Lubricating grease and speed reducer and robot comprising same Download PDFInfo
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- CN115074169A CN115074169A CN202110279920.1A CN202110279920A CN115074169A CN 115074169 A CN115074169 A CN 115074169A CN 202110279920 A CN202110279920 A CN 202110279920A CN 115074169 A CN115074169 A CN 115074169A
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- grease
- microns
- solid additive
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- robot
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- 239000004519 grease Substances 0.000 title claims abstract description 87
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 40
- 230000001050 lubricating effect Effects 0.000 title abstract description 21
- 239000000654 additive Substances 0.000 claims abstract description 49
- 230000000996 additive effect Effects 0.000 claims abstract description 40
- 239000002245 particle Substances 0.000 claims abstract description 35
- 239000007787 solid Substances 0.000 claims abstract description 34
- ZKZAYPCZGZAZAG-UHFFFAOYSA-J n,n-dibutylcarbamodithioate;molybdenum(4+) Chemical compound [Mo+4].CCCCN(C([S-])=S)CCCC.CCCCN(C([S-])=S)CCCC.CCCCN(C([S-])=S)CCCC.CCCCN(C([S-])=S)CCCC ZKZAYPCZGZAZAG-UHFFFAOYSA-J 0.000 claims abstract description 23
- 239000002199 base oil Substances 0.000 claims abstract description 17
- 229910000166 zirconium phosphate Inorganic materials 0.000 claims abstract description 13
- LEHFSLREWWMLPU-UHFFFAOYSA-B zirconium(4+);tetraphosphate Chemical compound [Zr+4].[Zr+4].[Zr+4].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LEHFSLREWWMLPU-UHFFFAOYSA-B 0.000 claims abstract description 13
- 239000002562 thickening agent Substances 0.000 claims abstract description 10
- 238000005260 corrosion Methods 0.000 claims description 16
- 230000007797 corrosion Effects 0.000 claims description 13
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 12
- 239000003112 inhibitor Substances 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 239000003963 antioxidant agent Substances 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 5
- 150000007524 organic acids Chemical class 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000007795 chemical reaction product Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 17
- 238000005299 abrasion Methods 0.000 abstract description 12
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 7
- 230000000052 comparative effect Effects 0.000 description 10
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 9
- 239000000203 mixture Substances 0.000 description 6
- ULQISTXYYBZJSJ-UHFFFAOYSA-N 12-hydroxyoctadecanoic acid Chemical compound CCCCCCC(O)CCCCCCCCCCC(O)=O ULQISTXYYBZJSJ-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000003078 antioxidant effect Effects 0.000 description 4
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 4
- 239000012964 benzotriazole Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000002480 mineral oil Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000001186 cumulative effect Effects 0.000 description 3
- PQVSTLUFSYVLTO-UHFFFAOYSA-N ethyl n-ethoxycarbonylcarbamate Chemical compound CCOC(=O)NC(=O)OCC PQVSTLUFSYVLTO-UHFFFAOYSA-N 0.000 description 3
- GLXDVVHUTZTUQK-UHFFFAOYSA-M lithium hydroxide monohydrate Substances [Li+].O.[OH-] GLXDVVHUTZTUQK-UHFFFAOYSA-M 0.000 description 3
- 229940040692 lithium hydroxide monohydrate Drugs 0.000 description 3
- 235000010446 mineral oil Nutrition 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000001384 succinic acid Substances 0.000 description 3
- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-N 0.000 description 2
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical compound C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 description 2
- YHMYGUUIMTVXNW-UHFFFAOYSA-N 1,3-dihydrobenzimidazole-2-thione Chemical compound C1=CC=C2NC(S)=NC2=C1 YHMYGUUIMTVXNW-UHFFFAOYSA-N 0.000 description 2
- 229940114072 12-hydroxystearic acid Drugs 0.000 description 2
- GSONHGLQHNTBED-UHFFFAOYSA-N 2,2,3,3-tetrakis(prop-2-enyl)butanedioic acid Chemical compound C=CCC(C(=O)O)(CC=C)C(CC=C)(CC=C)C(O)=O GSONHGLQHNTBED-UHFFFAOYSA-N 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 239000010685 fatty oil Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- DNIAPMSPPWPWGF-UHFFFAOYSA-N monopropylene glycol Natural products CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 229960004063 propylene glycol Drugs 0.000 description 2
- 235000013772 propylene glycol Nutrition 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- CBCKQZAAMUWICA-UHFFFAOYSA-N 1,4-phenylenediamine Chemical compound NC1=CC=C(N)C=C1 CBCKQZAAMUWICA-UHFFFAOYSA-N 0.000 description 1
- RUFPHBVGCFYCNW-UHFFFAOYSA-N 1-naphthylamine Chemical compound C1=CC=C2C(N)=CC=CC2=C1 RUFPHBVGCFYCNW-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- SHBUUTHKGIVMJT-UHFFFAOYSA-N Hydroxystearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OO SHBUUTHKGIVMJT-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- -1 alkyl succinic acid Chemical compound 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229940072106 hydroxystearate Drugs 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 125000001741 organic sulfur group Chemical group 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H49/00—Other gearings
- F16H49/001—Wave gearings, e.g. harmonic drive transmissions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
-
- 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
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/085—Phosphorus oxides, acids or salts
-
- 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
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
-
- 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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
- C10M2207/1285—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof used as thickening agents
-
- 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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
- C10M2215/064—Di- and triaryl amines
-
- 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
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
- C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
- C10M2219/066—Thiocarbamic type compounds
- C10M2219/068—Thiocarbamate metal salts
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
Abstract
The embodiment of the invention relates to lubricating grease, a speed reducer comprising the same and a robot. A grease comprising: a base oil; a thickener; and an additive comprising a solid additive having a particle size of 100 microns or less, the solid additive comprising molybdenum dibutyldithiocarbamate, or a combination of molybdenum dibutyldithiocarbamate and zirconium phosphate. The embodiment of the invention can be beneficial to the lubricating grease to have better extreme pressure, abrasion resistance and other performances and/or bench test grades, and the speed reducers such as harmonic reducers of robots have better transmission precision, temperature rise, noise and other performances.
Description
Technical Field
The invention relates to the technical field of lubrication, in particular to lubricating grease, and a speed reducer and a robot comprising the lubricating grease.
Background
In recent years, the robot industry has continued to advance. The speed reducer is one of important parts of the robot and can play a role in transmitting torque, adjusting rotating speed and the like. Among various speed reducers, the harmonic speed reducer is widely applied and has the characteristics of small size, large reduction ratio and the like.
According to the working condition of the harmonic reducer of the industrial robot, the harmonic reducer is generally required to keep higher transmission precision, lower temperature rise, lower noise and the like in long-term operation and frequent start and stop. The transmission accuracy, temperature rise, noise and the like of reducers such as harmonic reducers are generally related to extreme pressure, wear resistance and the like of lubricating grease.
The existing lubricating grease and the speed reducer and the robot comprising the same mostly have a lifting space.
Therefore, there is a need for improvement of the existing grease and a decelerator and a robot including the same.
Disclosure of Invention
The technical problems to be solved by the invention include that the existing lubricating grease and the speed reducer and the robot comprising the lubricating grease have a space for improving the extreme pressure performance, the abrasion resistance performance and the like of the lubricating grease, the transmission precision, the temperature rise, the noise and the like of the speed reducer.
An aspect of an embodiment of the present invention relates to a grease, including: a base oil; a thickener; and an additive comprising a solid additive having a particle size of 100 microns or less, the solid additive comprising molybdenum dibutyldithiocarbamate, or a combination of molybdenum dibutyldithiocarbamate and zirconium phosphate.
Optionally, the solid additive has a particle size of 50 microns or less, 10 microns or less, or 5 microns or less.
Optionally, the solid additive has a D90 of less than 25 microns, less than 10 microns, or less than 5 microns.
Optionally, the mass percentage of the solid additive to the grease is greater than 1%.
Optionally, the mass percentage of the solid additive to the grease is 3% or more.
Optionally, the range of mass percentage of the base oil to the grease includes 77% to 92%.
Optionally, the base oil has a kinematic viscosity at 40 ℃ in the range comprising 10mm 2 /s-80mm 2 S, or 20mm 2 /s-40mm 2 /s。
Optionally, the mass percentage of the thickener relative to the grease is in a range of 5% to 10%.
Optionally, the thickener comprises a reaction product of an organic acid and lithium hydroxide.
Optionally, the additives include one or more of extreme pressure antiwear liquid additives, antioxidants, anti-corrosion agents, copper corrosion inhibitors.
Another aspect of an embodiment of the present invention relates to a decelerator including the grease as described above.
Optionally, the retarder is a harmonic retarder.
Yet another aspect of an embodiment of the present invention relates to a robot including a decelerator as described above.
The technical scheme of the embodiment of the invention can be beneficial to the lubricating grease to have better extreme pressure, abrasion resistance and other performances and/or bench test grades, and the speed reducers such as harmonic reducers of robots have better transmission precision, temperature rise, noise and other performances.
Examples of the present invention will be further described below.
Detailed Description
An aspect of an embodiment of the present invention relates to a grease, including: a base oil; a thickening agent; and an additive comprising a solid additive having a particle size of 100 micrometers (μm) or less, the solid additive comprising molybdenum dibutyldithiocarbamate, or a combination of molybdenum dibutyldithiocarbamate and zirconium phosphate.
The technical scheme of the embodiment of the invention can be beneficial to the lubricating grease to have better extreme pressure, abrasion resistance and other performances and/or bench test grades, and the speed reducers such as harmonic reducers of robots have better transmission precision, temperature rise, noise and other performances.
In the embodiments of the present invention, unless otherwise specifically noted, the grease may function as lubrication, auxiliary cooling, rust prevention, cleaning, sealing, buffering, and the like. Grease may be applied between two objects that move relative to each other to reduce friction and wear of the two objects due to contact. Grease may be used on various types of machinery to protect machinery and work pieces. The grease may be a paste.
In the embodiments of the present invention, unless otherwise specifically indicated, numerical values may include errors such as a metering error, an accuracy error, a measurement error, and the like, for example, an error within a range of plus or minus 5%. For example, 100 may comprise a number in the range of 100 × (1 ± 5%), i.e. a number in the interval 95 to 105.
The solid additive with smaller particle size has higher surface energy and larger specific surface area, can contribute to effectively increasing the interaction with a friction pair, plays the obvious roles of reducing the friction coefficient and the abrasion, and can help and promote the low noise performance and the fretting wear performance of the speed reducer. Optionally, the solid additive has a particle size of 50 microns or less, 10 microns or less, or 5 microns or less.
The particle size of the solid additive can be characterized using parameters such as D10, D50, D90, and the like. D10 may correspond to a particle size with a cumulative particle distribution of 10%, i.e. the volume fraction of particles smaller than this is 10% of the total particles. D50 may correspond to a particle size distribution of 50% cumulative particle size, also referred to as median or median, meaning that 50% of the particles exceed this value and 50% are below this value. For example, a sample having a D50 of 8.65 μm indicates that of all the particles constituting the sample, 50% are particles larger than 8.65 μm and 50% are particles smaller than 8.65 μm. D90 may correspond to a particle size with a cumulative particle distribution of 90%, i.e. a volume fraction of particles smaller than this particle size represents 90% of the total particles. Optionally, the solid additive has a D90 of less than 25 microns, less than 10 microns, or less than 5 microns.
In the present examples, unless otherwise specifically indicated, the mass percentage of the components of the grease with respect to the grease may be the mass percentage of the components of the grease to the total mass of the grease.
The solid additive may include only molybdenum dibutyldithiocarbamate or may include a combination of molybdenum dibutyldithiocarbamate and zirconium phosphate. When the solid additive comprises a combination of molybdenum dibutyldithiocarbamate and zirconium phosphate, the mass percentage of molybdenum dibutyldithiocarbamate relative to the grease may be greater than, less than, or equal to the mass percentage of zirconium phosphate relative to the grease.
Optionally, the mass percentage of the solid additive to the grease is greater than 1%. Therefore, the lubricating grease has better extreme pressure, abrasion resistance and other performances and better bench test grade, and is more suitable for the application of a harmonic reducer of a robot and the like.
Optionally, the mass percentage of the solid additive to the grease is 3% or more. Therefore, the lubricating grease has better extreme pressure, abrasion resistance and other performances and better bench test grade, and is more suitable for the application of a harmonic reducer of a robot and the like. Optionally, the mass percentage of the solid additive to the grease is 10% or less. Thus, the lubricating grease can improve the performances of extreme pressure, abrasion resistance and the like and the bench test grade, and simultaneously can take the aspects of cost, other performances and the like into consideration.
In embodiments of the present invention, unless otherwise specifically indicated, a numerical range may include any subrange therein, e.g., 77% to 92% may include 80% to 90%, 79% to 89%, 85% to 91%, etc.
The base oil may be a mixture of mineral oil and fatty oil. Optionally, the range of mass percentage of the base oil to the grease includes 77% to 92%. The mass percentage of the mineral oil relative to the grease may be higher, lower or equal to the mass percentage of the fatty oil relative to the grease.
The viscosity of the base oil may affect the high temperature performance and the low temperature performance of the grease. Optionally, the base oil has a kinematic viscosity at 40 ℃ in a range comprising 10mm 2 /s-80mm 2 S, or 20mm 2 /s-40mm 2 And s. Thus, the grease can have better high-temperature performance and low-temperature performance.
Optionally, the mass percentage of the thickener relative to the grease is in a range of 5% to 10%. Thus, the grease can have better viscosity performance.
Optionally, the thickener comprises a reaction product of an organic acid and lithium hydroxide. Thus, the grease can have better viscosity performance. The lithium hydroxide may be lithium hydroxide monohydrate. The lithium hydroxide monohydrate can be dissolved in water and then contacts and reacts with the organic acid. The organic acid may include one or more of 12-hydroxystearic acid, azelaic acid, stearic acid, and the like.
The additives may include various ingredients as desired to enhance different properties of the grease. Optionally, the additives include one or more of extreme pressure anti-wear liquid additives, antioxidants, anti-corrosion agents, copper corrosion inhibitors.
The extreme pressure antiwear liquid additive may have a synergistic effect with the solid additive, which may help provide better antiwear effects. The extreme pressure anti-wear fluid additive may include an organic sulfur phosphorus compound, such as zinc dialkyldithiophosphate (ZnDDP). The range of mass percent of the extreme pressure anti-wear liquid additive relative to the grease may include 0.5% to 1%.
The antioxidant can delay the oxidation of the base oil during storage and use, thereby prolonging the service life of the lubricating grease. The antioxidant may comprise a hindered amine, a phenol, or a mixture of the two. The hindered amine antioxidant can comprise one or more of diphenylamine, naphthylamine and p-phenylenediamine. The range of mass percentage of the antioxidant with respect to the grease may comprise 0.5% to 1%.
The corrosion inhibitor can help to effectively improve the water resistance and corrosion resistance of the lubricating grease. The corrosion inhibitor can comprise one or more of barium petroleum sulfonate, calcium petroleum sulfonate and succinic acid semilipid compounds. Examples of succinic semilipid compounds may include mixtures of alkyl succinic semilipids in mineral oils. One commercially available corrosion inhibitor is a mixture of succinic semiester containing 30% to 50% (tetrapropenyl) succinic acid, 2- (tetrapropenyl) succinic acid, and < 25% monoester reactant of 1, 2-propanediol. The range of the mass percentage of the corrosion inhibitor relative to the grease may include 0.1% to 1%.
The copper corrosion inhibitor may be beneficial in reducing corrosion of copper-containing parts that may be present in mechanical structures by grease. The copper corrosion inhibitor can comprise one or more of Benzotriazole (BTA), 2-Mercaptobenzimidazole (MBI) and 2-mercaptobenzothiazole. The range of mass percent of the copper corrosion inhibitor relative to the grease may include 0.01% -1%.
Another aspect of an embodiment of the present invention relates to a decelerator including the grease as described above. The retarder may be any retarder that may include the grease of embodiments of the present invention. The speed reducer can play a role in transmitting torque, adjusting rotating speed and the like. The decelerator may be one of the components of the robot. The technical scheme of the embodiment of the invention can be beneficial to the lubricating grease to have better extreme pressure, abrasion resistance and other performances and/or bench test grades, and the speed reducers such as harmonic reducers of robots have better transmission precision, temperature rise, noise and other performances.
Optionally, the retarder is a harmonic retarder. The harmonic reducer may be one of the components of the robot. The technical scheme of the embodiment of the invention can be beneficial to the lubricating grease to have better extreme pressure, abrasion resistance and other performances and/or bench test grades, and the speed reducers such as harmonic reducers of robots have better transmission precision, temperature rise, noise and other performances.
Yet another aspect of an embodiment of the present invention relates to a robot including a decelerator as described above. The robot may be any of various robots applied to different occasions. For example, the robot may be an industrial robot. The technical scheme of the embodiment of the invention can be beneficial to the lubricating grease to have better extreme pressure, abrasion resistance and other performances and/or bench test grades, and the speed reducers such as harmonic reducers of robots have better transmission precision, temperature rise, noise and other performances.
The following experimental examples may be used to aid in the understanding of embodiments of the present invention, but are not intended to be used as limitations on the claims.
Experimental examples
About one-half of the base oil was added to the reaction kettle and preheated to about 80 degrees celsius. Adding 12-hydroxystearic acid into a reaction kettle, stirring and dissolving. Dissolving lithium hydroxide monohydrate in water to obtain a solution, slowly adding the solution into a reaction kettle, and reacting for 60-120 minutes. The temperature was raised to 130 ℃ to sufficiently remove water. Adding half of the rest base oil, and heating to 200-210 ℃ until the 12-lithium hydroxystearate soap agent is completely melted. The remaining base oil was added, stirred continuously and gradually cooled to about 80 ℃. The additives were added, stirred for about 60 minutes and allowed to cool to room temperature. The resultant was filled after being filtered, dispersed and homogenized by a post-treatment apparatus to obtain greases of examples 1 to 5 and comparative examples 1 to 6.
The following table 1 lists the categories and names of the respective raw materials involved in the preparation of the greases of examples 1 to 5 and comparative examples 1 to 6 described above, the mass percentages of the respective raw materials with respect to the total mass of the raw materials in each example, and the kinematic viscosity of the base oil at 40 ℃.
TABLE 1
The commercial corrosion inhibitor in table 1 above is a mixture of alkyl succinic acid half esters in mineral oil, where the succinic acid half ester is a mixture comprising 30% to 50% (tetrapropenyl) succinic acid, 2- (tetrapropenyl) succinic acid, monoester reactant with < 25% 1, 2-propanediol. BTA is benzotriazole, ZnDDP is zinc dialkyldithiophosphate, MoDTC (N) is larger-particle molybdenum dibutyldithiocarbamate, MoDTC (U) is smaller-particle molybdenum dibutyldithiocarbamate, alpha-ZrP is zirconium phosphate, graphite is colloid particle, and BN is boron nitride. Table 2 below sets forth the particle size distribution data for MoDTC (N), MoDTC (U), α -ZrP, graphite, BN as set forth in Table 1 above.
TABLE 2
| D 10(μm) | D 50(μm) | D 90(μm) | |
| MoDTC(N) | 1.96 | 8.65 | 25.3 |
| MoDTC(U) | 0.73 | 1.66 | 3.81 |
| α-ZrP | 0.71 | 1.68 | 4.21 |
| Graphite | Max.2.5 | 3.0-5.5 | Max.10 |
| BN | 1.0 | 4.0 | 10.0 |
The greases of examples 1 to 5 and comparative examples 1 to 6 were sampled to observe the appearance, and were found to be pastes, and the performance test was carried out, and the results and the respective colors were shown in Table 3 below. The standards and descriptions referenced for the performance tests are shown in table 4 below.
TABLE 3
TABLE 4
As can be seen from the above, the grease sample of comparative example 1 containing no solid additive has poor extreme pressure and anti-wear properties, and the bench test scale is poor, which is not suitable for applications such as harmonic reducers of robots.
Examples 1-5 grease samples containing solid additives of smaller particles of molybdenum dibutyldithiocarbamate, or a combination of smaller particles of molybdenum dibutyldithiocarbamate and zirconium phosphate, all had better extreme pressure, antiwear, etc. performance, bench test ratings than comparative example 1, and were more suitable for applications such as harmonic reducers for robots.
Moreover, the grease samples of examples 2-5, in which the mass percent of the solid additive such as molybdenum dibutyldithiocarbamate was greater than 1%, or greater than or equal to 3%, were better in extreme pressure, anti-wear, etc., bench test ratings, and more suitable for applications such as harmonic reducers of robots, as compared to the grease sample of example 1, in which the mass percent of the solid additive such as molybdenum dibutyldithiocarbamate was equal to 1%.
Further, the bench test grade of the grease samples of examples 4, 5, which contained a solid additive of a combination of smaller particles of molybdenum dibutyldithiocarbamate and zirconium phosphate, was best suited for applications such as harmonic reducers for robots.
On the other hand, when the solid additive was 3% by mass, the grease sample of example 2 containing a smaller particle of molybdenum dibutyldithiocarbamate was better rated for bench testing than the grease sample of comparative example 2 containing a larger particle of molybdenum dibutyldithiocarbamate and the grease sample of comparative example 3 containing zirconium phosphate, and was more suitable for the application of the harmonic reducer of the robot.
Meanwhile, when the mass percent of the solid additive is 5%, the grease sample of example 3 containing the smaller-particle molybdenum dibutyldithiocarbamate has better friction wear, extreme pressure, abrasion resistance and bench test grade than the grease sample of comparative example 4 containing zirconium phosphate, and is more suitable for the application of the harmonic reducer of the robot.
In addition, the grease samples of example 4 and comparative examples 5 and 6, in which the solid additive comprises the same mass percentage of smaller particles of molybdenum dibutyldithiocarbamate respectively as the mass percentage of the combination of zirconium phosphate and graphite and boron nitride, have better performances of frictional wear, extreme pressure, wear resistance and the like and bench test grades than the grease samples of example 4, and are more suitable for applications such as harmonic reducers of robots. The grease samples of comparative examples 5, 6 have not passed the frictional wear SRV test.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (13)
1. A grease, comprising:
a base oil;
a thickener; and
an additive comprising a solid additive having a particle size of 100 microns or less, the solid additive comprising molybdenum dibutyldithiocarbamate, or a combination of molybdenum dibutyldithiocarbamate and zirconium phosphate.
2. The grease of claim 1, wherein the solid additive has a particle size of 50 microns or less, 10 microns or less, or 5 microns or less.
3. The grease of claim 1, wherein the solid additive has a D90 of less than 25 microns, less than 10 microns, or less than 5 microns.
4. The grease of claim 1, wherein the mass percentage of the solid additive to the grease is greater than 1%.
5. The grease of claim 1, wherein the mass percentage of the solid additive to the grease is 3% or more.
6. The grease of claim 1, wherein the range of mass percent of the base oil to the grease comprises 77% to 92%.
7. The grease of claim 1, wherein the base oil has a kinematic viscosity at 40 ℃ in the range comprising 10mm 2 /s-80mm 2 S, or 20mm 2 /s-40mm 2 /s。
8. The grease of claim 1, wherein the mass percentage of the thickener relative to the grease ranges from 5% to 10%.
9. The grease of claim 1, wherein the thickener comprises a reaction product of an organic acid and lithium hydroxide.
10. The grease of claim 1, wherein the additives comprise one or more of extreme pressure anti-wear liquid additives, antioxidants, anti-corrosion agents, copper corrosion inhibitors.
11. A retarder comprising a grease according to any one of claims 1-10.
12. A reducer according to claim 11, which is a harmonic reducer.
13. A robot comprising a decelerator according to claim 11 or 12.
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