CN104513694A - Lubricating grease composition - Google Patents
Lubricating grease composition Download PDFInfo
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- CN104513694A CN104513694A CN201310455331.XA CN201310455331A CN104513694A CN 104513694 A CN104513694 A CN 104513694A CN 201310455331 A CN201310455331 A CN 201310455331A CN 104513694 A CN104513694 A CN 104513694A
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- lithium stearate
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Abstract
The present invention provides a lubricating grease composition with high mechanical shear stability. The lubricating grease composition is characterized in that a fatty acid lithium-based thickener obtained by mixing lithium stearate and 12-hydroxy lithium stearate, and more than one additives containing phosphorus and/or sulfur are matched and mixed in a base oil.
Description
Technical field
The present invention relates to the grease composition high to the stability of mechanical shearing.
Background technology
Lubricating grease makes the fibrous viscosifying agent such as metallic soap, carbamide compound be dispersed in liquid lubricating oil, makes the finish of semi-solid.Owing to being semi-solid, therefore there is not easy oil leakage, the advantage of oiling system simplification, miniaturization can be made, be widely used in automobile (non-patent literatures 1) such as mechanical organ, the particularly bearings of the various industrial machines being representative.As concrete main applicable object, the Transport Machinery of automobile, railway etc. can be listed; The information machines such as computer; The steel equipments such as rolling mill; The industrial machine such as lathe or construction machinery etc.
In lubricating grease, except base oil, viscosifying agent, also mixture has the various performance additive for giving oilness, oxidative stability, rust-preventing characteristic, imposes the formula adapting to purposes.But this performance of grease base is mostly obtained by compounding viscosifying agent, mobility (hardness), point oiliness, thermotolerance, water tolerance, shear stability are influenced.Therefore, according to purposes, optimal formula is carried out to the kind of viscosifying agent and compounding amount.
Known viscosifying agent is roughly divided into soap system and non-soap system, uses the fatty acid soaps of calcium, lithium, sodium, aluminium etc., use the wilkinite etc. of the carbamide compound of organic system, inorganic system in non-soap system in soap system.
In these viscosifying agents, the lithium soap of what the balance of fundamental property was the most excellent is metallic soap.Particularly lithium stearate, its fusing point is 220 DEG C and also excellent with the affinity of base oil, is therefore widely used in conventional lubricating grease (non-patent literature 1).
prior art document
non-patent literature
Non-patent literature 1: " Run sliding グ リ ー ス Ji Foundation と ying is used ", society team legal person Japan ト ラ イ ボ ロ ジ ー learns グ リ ー ス research association Knitting, Raising Yin hall, p.4-6(grease base plinth and application, Japan of Corporation tribology can lubricating grease research association be compiled, and supports virtuous hall, 4th ~ 6 pages)
Summary of the invention
the problem that invention will solve
On the other hand, in recent years, bearing, gear, ball-screw (ball screw), the lubrication environment directly transporting the mechanical organs such as guiding piece (linearmotion guide) become more harsh, and mechanical shearing, thermal load increase, and guarantee that stable sliding properties becomes difficulty.In order to maintain stable sliding properties, expect to maintain the original state of lubricating grease, specifically, even if expect that changes in hardness in actual use is few and also regardless of oil under being in high temperature.But only that lithium stearate is insufficient as the resistance to point of oiliness at high temperature of conventional lubricating grease in the past of viscosifying agent, what caused by mechanical shearing softens greatly, long stability existing problems.
The present invention, for the purpose of the further high performance of omnipotent lithium gease, relates to the optimal formula by viscosifying agent, and raising becomes the grease composition of the mechanical shearing stability of problem and resistance to point of oiliness under improving high temperature all the time.
for the scheme of dealing with problems
The present inventor conducts in-depth research to solve the problem, and found that using specified quantitative mixing 12-hydroxy lithium stearate and lithium stearate as viscosifying agent, thus the stability of mechanical shearing increases and resistance to point of oiliness excellence under high temperature.
That is, the present invention as described below.
[1] grease composition, is characterized in that, compounding in base oil have: the additive containing phosphorus and/or sulphur of the fatty acid lithium system viscosifying agent that lithium stearate and 12-hydroxy lithium stearate are mixed to get and more than a kind.
[2] grease composition according to aforementioned [1], it is characterized in that, the ratio of mixture of lithium stearate and 12-hydroxy lithium stearate is counted with fatty acid lithium system viscosifying agent total amount benchmark, lithium stearate 5 ~ 50 quality % and 12-hydroxy lithium stearate 50 ~ 95 quality %.
[3] grease composition according to aforementioned [1] or [2], is characterized in that, the compounding amount of fatty acid lithium system viscosifying agent counts 1 ~ 20 quality % with lubricating grease total amount benchmark.
[4] grease composition according to any one of aforementioned [1] ~ [3], it is characterized in that, additive containing phosphorus is organophosphate, and the additive containing sulphur is organosulfur compound, and respective content counts 0.1 ~ 5 quality % with lubricating grease total amount benchmark.
the effect of invention
Grease composition of the present invention, even if be subject to mechanical shearing, hardness change also few, and resistance to point of oiliness under high temperature is high, even if the original state of lubricating grease therefore also can be maintained through life-time service in the mechanical organs such as bearing, gear, ball-screw, direct acting guiding piece, therefore, it is possible to stably reproduce sliding properties.
Embodiment
Below, the present invention is described in detail.
Grease composition of the present invention contains base oil, comprises the fatty acid lithium system viscosifying agent of lithium stearate and 12-hydroxy lithium stearate and contains the additive of phosphorus and/or sulphur.
Base oil comprises more than a kind in mineral oil and/or synthetic hydrocarbon oil, and in order to have excellent oilness, the kinematic viscosity preferably at 40 DEG C is 5 ~ 5000mm
2/ s, more preferably 10 ~ 1000mm
2/ s.
As mineral oil, its lubricating oil distillate refined by process for refining such as hydrofining, solvent extraction, solvent dewaxings for the distilled oil obtained by underpressure distillation crude oil further after air distillation crude oil or air distillation, by different crude oil or distilled oil by different process combination, order and the mixture of the different treated oil of more than two kinds of the proterties obtained also is useful.
As synthetic hydrocarbon oil, be such as polyolefine, alkylbenzene, the alkylnaphthalene etc. such as multipolymer of poly-alpha-olefin, polybutene, various alkene of more than two kinds, wherein, poly-alpha-olefin is from availability, cost aspect, viscosity characteristics, oxidative stability, consider it is preferred with the suitability aspect of system component.In poly-alpha-olefin, the polymkeric substance of 1-laurylene, 1-decene etc. is preferred further from the viewpoint of cost.
In the present invention, base oil can be only made up of the one in mineral oil or synthetic hydrocarbon oil, or also can be the mixture of both.That is, can be in mineral oil or synthetic hydrocarbon oil wantonly a kind, also can be the mixed base oil of mineral oil and synthetic hydrocarbon oil any one.Further, mineral oil, synthetic hydrocarbon oil can be respectively one kind or two or more.
Base oil is preferably 70 ~ 98.9 quality % in grease composition total amount benchmark.When the content of base oil is in beyond the scope of 70 ~ 98.9 quality %, be difficult to the composition modulating the hardness with expectation easily, and resistance to point of oiliness difference.
Fatty acid lithium system viscosifying agent used in the present invention comprises lithium stearate and 12-hydroxy lithium stearate.
Resistance to point of oiliness when lithium stearate, 12-hydroxy lithium stearate individually use under machinery shear stability, high temperature is insufficient, and must combine both and use, its compounding ratio exists optimum range.More specifically, when the total compounding amount of fatty acid lithium system viscosifying agent is set to 100 quality %, preferred lithium stearate is 5 ~ 50 quality % and 12-hydroxy lithium stearate is 50 ~ 95 quality %, more preferably lithium stearate is 5 ~ 40 quality % and 12-hydroxy lithium stearate is 60 ~ 95 quality %, most preferably lithium stearate is 5 ~ 30 quality % and 12-hydroxy lithium stearate is 70 ~ 95 quality %.By adopt above-mentioned compounding ratio make mechanical stability and resistance to point of oiliness the most excellent.
The compounding amount of fatty acid lithium system viscosifying agent is counted 1 ~ 20 quality % with lubricating grease total amount benchmark, is preferably 2 ~ 17 quality %.The composition of the hardness with expectation can not be obtained when being in beyond this compounding scope, resistance to point of oiliness also reduces.
Grease composition of the present invention is except mentioned component, can suitably add the additive being generally used for lubricating oil, lubricating grease as required, such as sanitising agent, dispersion agent, anti-abrasion agent, viscosity index improver, antioxidant, extreme pressure agent, rust-preventive agent, anticorrosive agent, solid lubricant etc.
Wherein, for anti-abrasion agent, extreme pressure agent, preferably, the various lubrication environment that imagination lubricating grease is applied, compounding optimal additive.In the present invention, preferably compounding more than a kind the anti-abrasion agent containing phosphorus and/or sulphur, extreme pressure agent, particularly organophosphate and/or organosulfur compound from the viewpoint of oilness, oxidative stability, manufacturing cost be preferred.
As organophosphate, preferred dialkyl phosphite, phosphorous acid diaryl ester, trialkyl phosphite, triaryl phosphites, trialkylphosphate, triaryl phosphate etc.The compounding amount of these organophosphates is preferably 0.1 ~ 5 quality % in lubricating grease total amount benchmark, and the compounding amount beyond this scope can not be guaranteed enough oilnesies or can not expect that the performance corresponding with adding cost improves.
As organosulfur compound, single sulfide, disulphide, polysulfide, sulfuration grease etc. can be listed.The compounding amount of these organosulfur compounds is preferably 0.1 ~ 5 quality % in lubricating grease total amount benchmark, and the compounding amount beyond this scope can not be guaranteed sufficient oilness or can not expect that the performance corresponding with adding cost improves.
In the present invention, the preferably organophosphate of compounding more than a kind and/or organosulfur compound, thus, oilness improves significantly, this grease composition can be applied to various uses.
The method manufacturing grease composition of the present invention preferably includes: lube base oil component, fatty acid lithium system viscosifying agent and each additive are mixed by specified amount, heat while stirring, slowly cool to room temperature after each uniform composition ground dissolves, thus obtain the operation of the lubricating composition of semi-solid.Or also can mix lipid acid and the lithium hydroxide of the regulation of the raw material as fatty acid lithium system viscosifying agent in lube base oil component, limit heating edge generates desired fatty acid lithium by dehydration reaction in base oil.
In addition, the grease composition obtained for mixed lubrication oil base oil composition, fatty acid lithium system viscosifying agent composition and each additive component, can utilize roller as required, grinding machine (mill) carries out pressurized dispersion process etc.
embodiment
Below, specifically describe the present invention further based on embodiment and comparative example, but the present invention is not by any restriction of following embodiment.
[base oil: mineral oil]
Based on oil, use and the mineral oil that solvent treatment obtains, has following proterties carried out to the distilled oil underpressure distillation of air distillation residue obtained.
Kinematic viscosity at 40 DEG C: 100mm
2/ s
Density at 15 DEG C: 0.89g/cm
3
Viscosity index: 96
[viscosifying agent-1]
As viscosifying agent-1, use the 12-hydroxy lithium stearate of following proterties.
Lithium content: 2.2 quality %
Acid number: 1.9mgKOH/g
Fusing point: 205 ~ 211 DEG C
Moisture: 0.2 quality %
[viscosifying agent-2]
As viscosifying agent-2, use the lithium stearate of following proterties.
Lithium content: 2.5 quality %
Acid number: 0.5mgKOH/g
Fusing point: 220 DEG C
Moisture: 0.5 quality %
[anti-abrasion agent/extreme pressure agent]
The triaryl phosphate of organophosphate, the polysulfide of organosulfur compound is used as anti-abrasion agent/extreme pressure agent.
[other additive]
As general additive, compounding (0.5 quality %) phenol system antioxidant, (1.0 quality %) amine system antioxidant.
[embodiment 1 ~ 12, comparative example 1 ~ 6]
In embodiment 1 ~ 12 and comparative example 1 ~ 6, base oil, viscosifying agent and each additive are put in stainless steel container with the compounding amount (representing with quality %) shown in table 1 ~ 2, is heated to about 220 DEG C, makes it dissolve equably.After cooling, when becoming semi-solid, carry out pressurized dispersion process with roller (triple-roller mill), obtain the grease composition with the composition shown in table 1 ~ 2.
[evaluation test]
The grease composition of embodiment 1 ~ 12 and comparative example 1 ~ 6 is used to carry out various performance validation tests.
[denseness]
The hardness of the grease composition of semi-solid is compared by the flow test of JIS K2220.Denseness measures at 25 DEG C under not mixed state and after mixed 60 times.By relatively more mixed denseness and not mixed denseness, grasp the stability of mechanical shearing.That is, can judge, mixed less, higher for the stability of mechanical shearing with not mixed denseness difference.
[dropping point]
In order to evaluate resistance to point of oiliness under high temperature easily, measuring base oil by the dropping point evaluation assessment of JIS K2220 and being separated the temperature of dripping from grease composition.
[point oil content]
In order to grasp the degree of point oil under high temperature exactly, implement point oil content test of JIS K2220.To be determined at 100 DEG C the quality of the oil be separated from grease composition after 30 hours, to obtain a point oil content.
[oilness]
Oilness is compared by the welding load (welding load) based on the high speed four-ball test (1770rpm) of ASTM D2596.
[table 1]
[table 2]
In table 1 ~ 2, the compounding amount of fatty acid lithium system viscosifying agent is: embodiment 1 ~ 5 and comparative example 1 ~ 2, comparative example 5 are 10 quality %, and embodiment 7 ~ 11 and comparative example 3 ~ 4 are 8 quality %, and embodiment 6 is 16 quality %, and embodiment 12 and comparative example 6 are 2.5 quality %.First, for independent compounding 12-hydroxy lithium stearate as the comparative example 1 of viscosifying agent, comparative example 3 and comparative example 6, the phenomenon that mixed denseness diminishes, hardens when confirming to be subject to mechanical shearing compared with mixed denseness.In actual use, if lubricating grease hardens, sliding resistance increases, therefore not preferred.In addition, for the comparative example 2 and the comparative example 4 that are used alone lithium stearate, although compared with mixed denseness mixed denseness large, there is softening tendency, it differs from more than 10, and therefore mechanical shearing stability is low.Further, also comparatively comparative example 1, comparative example 3 are large for point oil content, and resistance to point of oiliness is not talkative is sufficient.
On the other hand, compared with comparative example, combinationally use the embodiment 1 ~ 12 of 12-hydroxy lithium stearate in lithium stearate, the difference of not mixed denseness and mixed denseness is little and point oil content under high temperature is also little.
In addition, the welding load of embodiment 1 ~ 12 in high speed four-ball test of the compounding phosphoric acid ester as anti-abrasion agent/extreme pressure agent and organosulfur compound is 3089N, and on the other hand, the welding load of the comparative example 5 of these additives not compounding is 981N.
Resistance to point of oiliness under these mechanical shearing stability, high temperature is obtained by the best of breed result of use of lithium stearate and 12-hydroxy lithium stearate, and the raising of the compounding oilness brought by organophosphate and/or organosulfur compound, can obtain the sliding properties of long-time stable in the actual use of mechanical organ.
utilizability in industry
Grease composition of the present invention is in the actual use of the mechanical organs such as bearing, gear, ball-screw, direct acting guiding piece, even if be subject to mechanical shearing, hardness also not easily change, even and if oil content is not easily separated yet under high temperature, and there is high lubricity, therefore, it is possible to keep the original state of lubricating grease for a long time, thus the sliding properties of the regulation of mechanical organ can be maintained, be therefore useful in various mechanical system.
Claims (4)
1. a grease composition, is characterized in that, compounding in base oil have: the fatty acid lithium system viscosifying agent that lithium stearate and 12-hydroxy lithium stearate are mixed to get, and the additive containing phosphorus and/or sulphur of more than a kind.
2. grease composition according to claim 1, is characterized in that, the ratio of mixture of lithium stearate and 12-hydroxy lithium stearate is counted with fatty acid lithium system viscosifying agent total amount benchmark, lithium stearate 5 ~ 50 quality % and 12-hydroxy lithium stearate 50 ~ 95 quality %.
3. grease composition according to claim 1 and 2, is characterized in that, the compounding amount of fatty acid lithium system viscosifying agent counts 1 ~ 20 quality % with lubricating grease total amount benchmark.
4. according to the grease composition according to any one of claims 1 to 3, it is characterized in that, the additive containing phosphorus is organophosphate, and the additive containing sulphur is organosulfur compound, and respective content counts 0.1 ~ 5 quality % with lubricating grease total amount benchmark.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310455331.XA CN104513694A (en) | 2013-09-29 | 2013-09-29 | Lubricating grease composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310455331.XA CN104513694A (en) | 2013-09-29 | 2013-09-29 | Lubricating grease composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104513694A true CN104513694A (en) | 2015-04-15 |
Family
ID=52789566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310455331.XA Pending CN104513694A (en) | 2013-09-29 | 2013-09-29 | Lubricating grease composition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104513694A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5256320A (en) * | 1992-07-10 | 1993-10-26 | The Lubrizol Corporation | Grease compositions |
| CN101087868A (en) * | 2004-07-30 | 2007-12-12 | 美蓓亚株式会社 | Lithium grease composition sealed in a small motor bearing to reduce noise |
| CN101235338A (en) * | 2008-01-30 | 2008-08-06 | 益田润石（北京）化工有限公司 | Open-type gear grease composition |
| CN102140382A (en) * | 2011-01-28 | 2011-08-03 | 华南理工大学 | Hub bearing lubricating grease and preparation method thereof |
-
2013
- 2013-09-29 CN CN201310455331.XA patent/CN104513694A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5256320A (en) * | 1992-07-10 | 1993-10-26 | The Lubrizol Corporation | Grease compositions |
| CN101087868A (en) * | 2004-07-30 | 2007-12-12 | 美蓓亚株式会社 | Lithium grease composition sealed in a small motor bearing to reduce noise |
| CN101235338A (en) * | 2008-01-30 | 2008-08-06 | 益田润石（北京）化工有限公司 | Open-type gear grease composition |
| CN102140382A (en) * | 2011-01-28 | 2011-08-03 | 华南理工大学 | Hub bearing lubricating grease and preparation method thereof |
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Application publication date: 20150415 |