WO2011125842A1 - 潤滑油組成物 - Google Patents
潤滑油組成物 Download PDFInfo
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- WO2011125842A1 WO2011125842A1 PCT/JP2011/058226 JP2011058226W WO2011125842A1 WO 2011125842 A1 WO2011125842 A1 WO 2011125842A1 JP 2011058226 W JP2011058226 W JP 2011058226W WO 2011125842 A1 WO2011125842 A1 WO 2011125842A1
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- oil
- base oil
- diester
- lubricating
- lubricating oil
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Classifications
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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
- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
- C10M105/32—Esters
- C10M105/38—Esters of polyhydroxy compounds
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/283—Esters of polyhydroxy compounds
- C10M2207/2835—Esters of polyhydroxy compounds used as base material
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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
- 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
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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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/086—Imides
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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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/22—Heterocyclic nitrogen compounds
- C10M2215/223—Five-membered rings containing nitrogen and carbon only
-
- 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
- C10M2215/28—Amides; Imides
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- 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
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/02—Viscosity; Viscosity index
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- 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
- C10N2030/02—Pour-point; Viscosity index
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- 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
- C10N2030/74—Noack Volatility
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- 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
- C10N2040/02—Bearings
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- 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
- C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
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- 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
- C10N2040/08—Hydraulic fluids, e.g. brake-fluids
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- 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
- C10N2040/14—Electric or magnetic purposes
- C10N2040/18—Electric or magnetic purposes in connection with recordings on magnetic tape or disc
Definitions
- the present invention relates to a lubricating base oil that has the features of low volatility and excellent low temperature fluidity, and that can exhibit lubricity for a long period of time in a wide range from low temperature to high temperature, and a lubricating oil composition using the same.
- Lubricating base oils are required to exhibit stable performance over a long period of time, that is, low volatility, excellent thermal / oxidative stability, low temperature startability (low temperature fluidity), and high viscosity index (wide range). . In particular, it is no exaggeration to say that having the characteristics of low viscosity and low volatility is the ultimate goal.
- Lubricating oil generally tends to evaporate as the viscosity becomes lower. If the lubricating oil is reduced by evaporation or the like, an appropriate oil film pressure cannot be obtained, and the rotational accuracy is remarkably lowered and regarded as the service life. Therefore, the evaporation characteristic of the lubricating oil is an important characteristic that affects the durability of the bearing. Therefore, for lubrication of sliding bearings such as fluid dynamic pressure bearings, porous oil-impregnated bearings, and dynamic pressure-type porous oil-impregnated bearings, select lubricating oils that have low viscosity and do not have an excessive viscosity increase even at low temperatures, and that have relatively excellent evaporation characteristics. There is a need to. In many cases, ester-based lubricating oil is used.
- ⁇ ester oil tends to have poor evaporation characteristics as the viscosity decreases. Therefore, simply selecting an ester oil having a lower viscosity than the current one in order to reduce the torque of the bearing will impair the evaporation characteristics and reduce the durability of the bearing. Further, even if the viscosity is low at room temperature, if the viscosity suddenly rises in the low temperature range or loses fluidity, it will lead to a sudden increase in torque or equipment shutdown.
- Patent Document 1 discloses a lubricating oil composition using, as a base oil, a diester obtained from a straight chain dihydric alcohol having 6 to 12 carbon atoms and a branched saturated monohydric fatty acid having 6 to 12 carbon atoms. It is disclosed.
- the above-described conventional technology can obtain a lubricating oil having low viscosity characteristics by appropriately selecting alcohol and fatty acid.
- diesters having a viscosity at 40 ° C. of 10 mm 2 / s or less can reduce the molecular weight.
- the amount of evaporation increases, and since the molecular weight is uniform, evaporation occurs almost simultaneously, so that the durability may suddenly drop at certain conditions. This is because many esters have a symmetrical chemical structure. In other words, since it is a single composition, its limit point is clear and the motor may be forced to stop suddenly due to evaporation.
- Patent Document 2 discloses a diester mainly comprising an ester synthesized from a monohydric alcohol having 8 carbon atoms and a divalent carboxylic acid having 6 carbon atoms, and having a kinematic viscosity at 40 ° C. of 10 mm.
- a lubricating oil composition containing 1 to 5 wt% of a diester having a total carbon number of 23 to 28 at 2 / s or more, and a hydrodynamic bearing unit using the lubricating oil composition are disclosed.
- Patent Document 3 a diester or triester synthesized from a divalent or trivalent carboxylic acid having 9 or less carbon atoms and a monovalent glycol ether such as an alkylene glycol monoalkyl ether having 3 to 25 carbon atoms is mainly used.
- Lubricating base oils included as components are described.
- the present invention has been made in view of the above problems, and has a feature of low volatility and excellent low temperature fluidity, and a lubricating base oil that can express lubricity for a long period of time in a wide range from low temperature to high temperature, and the same
- An object of the present invention is to provide a lubricating oil composition using
- the present invention relates to a lubricating base oil characterized by comprising a diester represented by the following formula (1) as a main component.
- R 1 and R 2 are each independently a 1-ethylpentyl group, n-heptyl group or n-hexyl group.
- the molar ratio (A: B: C) is in the range of 25 to 65:30 to 50: 3 to 25.
- A is one in which R 1 and R 2 are both n-heptyl group or n-hexyl group
- B is one in which one of R 1 and R 2 is 1-ethylpentyl group
- C is R 1 and R 2 are both 1-ethylpentyl groups.
- the molar ratio (A: B: C) is more preferably in the range of 35-50: 40-50: 5-15.
- the diester represented by the formula (1) is preferably 50 wt% or more of the base oil.
- the lubricating base oil of the present invention had a neopentyl glycol skeleton having a kinematic viscosity at 40 ° C. of less than 9 mm 2 / s and a viscosity index of 100 or more.
- the low-viscosity oil which is a polyol ester, may be contained in an amount of 5 to 30 wt%, and the low-viscosity oil is preferably a polyol ester obtained from caprylic acid or capric acid and neopentyl glycol.
- the present invention also relates to a lubricating oil composition obtained by using the above lubricating base oil.
- the lubricating base oil of the present invention contains a diester represented by the above formula (1) as a main component.
- the diester represented by the formula (1) is contained in an amount of 50 wt% or more.
- R 1 and R 2 are 1-ethylpentyl group, n-heptyl group or n-hexyl group.
- R 1 and R 2 may be the same or different.
- the 1-ethylpentyl group is a branched alkyl group
- the n-heptyl group and the n-hexyl group are linear alkyl groups.
- R 1 and R 2 are components derived from carboxylic acid, and specifically derived from 2-ethylhexanoic acid, caprylic acid or enanthic acid.
- the component derived from alcohol is 2-methyl-1,8-octanediol. Since this diester does not have an excessively branched chain, it has a high viscosity index and low viscosity, particularly in a low temperature region. Moreover, it is excellent in low evaporation.
- the diester represented by the formula (1) is not a single compound but a mixture of diesters in which R 1 and R 2 are changed within the above range, thereby improving the viscosity, evaporability and low temperature fluidity at low temperatures. It becomes possible.
- the molar ratio of A: B: C in formula (1) is in the range of 25 to 65:30 to 50: 3 to 25, preferably in the range of 35 to 50:40 to 50: 5 to 15. It is in.
- A, B, and C have the above-mentioned meanings, but when A includes only a linear alkyl group, B includes both a linear alkyl group and a branched alkyl group, and C includes only a branched alkyl group. In other words, the characteristics can be improved by controlling these ratios.
- the lubricating base oil of the present invention if the content of the diester is 50 wt% or more of the base oil, preferably 65 wt% or more, more preferably 70 wt% or more, the lubricating oil has low viscosity and low evaporation at low temperatures. Can be sufficiently improved.
- a diol other than 2-methyl-1,8-octanediol is mixed and esterified, or 2-ethylhexanoic acid, caprylic acid, enanthic acid is used.
- the method of esterifying by mixing acids other than these is mentioned.
- Examples of the mixing method include a method of mixing with an existing base oil such as ester and polyalphaolefin.
- a low viscosity oil which is a polyol ester having a neopentyl glycol skeleton having a kinematic viscosity at 40 ° C. of less than 9 mm 2 / s and a viscosity index of 100 or more
- This low-viscosity oil is included, it is preferably in the range of 5 to 30 wt%.
- the low-viscosity oil is preferably an esterified product of neopentyl glycol and capric acid or caprylic acid.
- the diester as the main component of the lubricating base oil of the present invention comprises an alcohol component comprising 2-methyl-1,8-octanediol, 2-ethylhexanoic acid, and an acid component comprising caprylic acid and / or enanthic acid. It is obtained by reacting.
- the acid component needs to contain 2-ethylhexanoic acid having a branched chain as an essential component.
- caprylic acid and enanthic acid may be included.
- By controlling the use ratio of the acid component a diester satisfying the above molar ratio can be obtained. However, it can also be obtained by blending individual diesters such as those obtained from 2-methyl-1,8-octanediol and 2-ethylhexanoic acid.
- the diester is prepared by diesterification of the acid component and the alcohol component according to a conventional method, preferably by heating and stirring in an inert gas atmosphere such as nitrogen, in the presence or absence of an esterification catalyst.
- the A specific method includes a synthesis method in which esterification proceeds at a high temperature while removing water produced by a condensation reaction. For this reaction, it is possible to use no catalyst or to use a catalyst such as sulfuric acid, paratoluenesulfonic acid, tetrakisalkoxytitanate, etc., and it is also possible to use a dehydrating solvent such as toluene, ethylbenzene or xylene in combination.
- the acid component is used in an amount of, for example, 2.0 mol or more, preferably 2.01 to 4.5 mol per mol of the alcohol component.
- the lubricating base oil of the present invention is a base oil for lubricating oil compositions such as liquid lubricating oils and greases.
- the lubricating oil composition of the present invention uses this base oil and is blended with components for improving the performance of the lubricating oil composition.
- examples of such components include known antioxidants, oil-based agents, There are additives and thickeners such as antiwear agents, extreme pressure agents, metal deactivators, rust inhibitors, viscosity index improvers, pour point depressants and antifoaming agents.
- additives can be appropriately blended. These additives are preferably added in an amount of 0.01 to 10 wt%, more preferably 0.03 to 5 wt%, based on the lubricating base oil.
- the thickener used for it is not particularly limited, and those used in ordinary grease can be used as appropriate.
- metal soap, composite soap, urea, organic bentonite, silica and the like can be mentioned.
- the content of the thickener in the grease is usually 3 to 30 wt%.
- one type of additives such as antioxidants, extreme pressure agents, rust inhibitors, metal corrosion inhibitors, oiliness agents, viscosity index improvers, pour point depressants, adhesion improvers, etc. that are generally blended into grease Or 2 or more types can be mix
- These additives are usually added in an amount of preferably 0.01 to 10% by weight, more preferably 0.03 to 5% by weight, based on the grease base oil.
- the lubricating oil composition using the lubricating base oil of the present invention includes industrial lubricants such as hydraulic oil, gear oil, spindle oil, bearing oil, dynamic pressure bearing oil, sintered oil-impregnated bearing oil, hinge oil, Applicable to various uses such as sewing machine oil and sliding surface oil.
- industrial lubricants such as hydraulic oil, gear oil, spindle oil, bearing oil, dynamic pressure bearing oil, sintered oil-impregnated bearing oil, hinge oil, Applicable to various uses such as sewing machine oil and sliding surface oil.
- As grease it can apply to various lubrication parts, such as a bearing part (ball, roller, needle), a sliding part, and a gear part.
- Fluid bearing unit A bearing unit that supports the rotating shaft by the oil film pressure of the lubricating oil interposed in the clearance between the outer peripheral surface of the shaft and the inner peripheral surface of the sleeve, and uses the lubricating oil composition of the present invention as a lubricant. It is.
- Fluid dynamic pressure bearing unit A bearing unit in which a dynamic pressure generating groove is provided on either the outer peripheral surface of the shaft or the inner peripheral surface of the sleeve, and the lubricating oil composition of the present invention is used as a lubricant.
- Porous oil-impregnated bearing unit A porous oil-impregnated bearing impregnated with the lubricating oil composition of the present invention.
- Porous oil-impregnated bearing A bearing impregnated with the lubricating oil composition of the present invention.
- the porous oil-impregnated bearing is preferably a dynamic pressure type porous oil-impregnated bearing.
- Spindle motor A spindle motor equipped with the bearing unit described above.
- Example 1 A reaction apparatus composed of a 300 cc four-necked flask, a heating device, a stirring device, a thermometer, a nitrogen vent tube and nitrogen line, a Dean-Stark tube, a cooling tube and a cooling line was charged with 2-methyl-1 , 8-octanediol 24.05 g, saturated aliphatic monocarboxylic acid (hereinafter referred to as carboxylic acid) 32.01 g caprylic acid, 54.51 g 2-ethylhexanoic acid, tetrakis (IV) (2-ethyl- 1-Hexyloxy) titanate (0.1 g) was used as a catalyst, and the mixture was stirred at 170 ° C.
- carboxylic acid saturated aliphatic monocarboxylic acid
- caprylic acid 54.51 g
- the molar ratio was calculated from the area ratio in gas chromatography.
- R 1 and R 2 in the formula (1) are not branched alkyl chains A, one of which is a branched alkyl chain B, both of which are branched alkyl chains C
- A: B: C 47.9: 42.7: 9.4 (molar ratio)
- the total of A, B, and C was 96.0% of the total composition.
- Example 2 In the same manner as in Example 1, esterification was performed using 24.05 g of 2-methyl-1,8-octanediol, 31.04 g of caprylic acid as a carboxylic acid, and 58.65 g of 2-ethylhexanoic acid as raw materials.
- the diester (D2) was obtained.
- Example 3 In the same manner as in Example 1, esterification was performed using 24.05 g of 2-methyl-1,8-octanediol, 30.10 g of caprylic acid as a carboxylic acid, and 59.53 g of 2-ethylhexanoic acid as raw materials.
- the diester (D3) was obtained.
- Example 4 In the same manner as in Example 1, 24.05 g of a diol composed of 83% 2-methyl-1,8-octanediol and 15% 1,9-nonanediol was used as a raw material, and caprylic acid 29 as a carboxylic acid. 0.04 g and 2-ethylhexanoic acid 59.53 g as raw materials were esterified to obtain a diester (D4).
- Example 5 95 wt% of the diester (D2) synthesized in Example 2 and 5 wt% of a dipentyl glycol diester (Hatco) were mixed to obtain a diester (D5).
- Example 6 70% by weight of the diester (D2) synthesized in Example 2 and 30% by weight of H2962 were mixed to obtain a diester (D6).
- Example 7 In the same manner as in Example 1, esterification was performed using 32.05 g of 2-methyl-1,8-octanediol and 46.87 g of enanthate as a carboxylic acid and 68.50 g of 2-ethylhexanoic acid as raw materials.
- the diester (D11) was obtained.
- Example 8 In the same manner as in Example 1, esterification was performed using 32.05 g of 2-methyl-1,8-octanediol, 47.01 g of enanthic acid as a carboxylic acid, and 58.73 g of 2-ethylhexanoic acid as raw materials.
- the diester (D12) was obtained.
- Comparative Example 2 In the same manner as in Example 4, a diol composed of 83% 2-methyl-1,8-octanediol and 15% 1,9-nonanediol was used as a raw material, and caprylic acid, 2-ethyl as a carboxylic acid.
- a diester (D8) was obtained by esterifying a material using hexanoic acid as a raw material.
- Table 1 shows the total of A, B and C and various physical properties of the diesters (D1) to (D12) obtained in Examples and Comparative Examples.
- kinematic viscosity is a value at ⁇ 10 ° C.
- the evaporation loss is the weight loss (%) after holding the diester in a thermobalance in a nitrogen atmosphere at 120 ° C. for 8 hours.
- additives were blended with the diester obtained above to obtain a lubricating oil composition.
- IR39 Benzotriazole derivative (BASF Irgamet 39, metal deactivator)
- OAS1200 Succinimide (OAS1200 manufactured by Chevron Chemical, ashless dispersant)
- Examples 9-11 The diester (D2), (D5) or (D6) obtained in Example 2, 5 or 6 is used as a base oil, 0.5 wt% of L57, 0.03 wt% of IR39, and 1.5 wt% of OAS1200 are blended. Thus, a lubricating oil composition was obtained.
- Comparative Example 5 The diester (D9) obtained in Comparative Example 3 was used as a base oil, and a lubricating oil composition was prepared by blending 0.5 wt% of L57, 0.03 wt% of IR39, and 1.5 wt% of OAS1200.
- the rotational viscosity at ⁇ 10 ° C. was evaluated for the purpose of simulating an evaporation test and a bearing torque when used in an oil-impregnated bearing.
- the evaporation test was performed at 100 ° C. for 6000 hours.
- the evaporation test was conducted by putting 2 g of a sample in Laboran screw tube bottle # 3 (volume 9 ml). The n number was 2, and the average value was determined as the evaporation loss.
- the rotational characteristic that becomes a problem when used in oil-impregnated bearings is low temperature torque.
- the rotational torque at ⁇ 10 ° C. was measured to simulate the bearing torque in the actual machine.
- a motor manufacturer has a required specification that the rotational viscosity at ⁇ 10 ° C. is 100 mPa ⁇ s or less. This viscosity or less was regarded as acceptable.
- the measuring instrument used was SVM-3000 manufactured by Anton Paar.
- Table 2 shows the results of an evaluation test that is close to the actual condition for the above lubricating oil composition.
- the kinematic viscosity is a value at ⁇ 10 ° C.
- a value of 0.5% or less was shown with half the evaporation loss of the comparative example.
- the rotational characteristics were below the reference value, and a low temperature-low torque and high temperature-low evaporation lubricating oil composition that had been in a trade-off relationship and had been difficult to achieve at the same time was obtained.
- the evaporation loss of the lubricating oil composition of Example 9 is the smallest, and the rotational viscosity is also below the reference value.
- Examples 10 and 11 using a polyol ester as a part of the base oil also lowered the viscosity without significantly inhibiting the evaporation loss.
- the lubricating oil composition of Comparative Example 5 is said to have the best balance among the existing base oils, and has been adopted in many small motors, but having developed a lubricating oil with performance exceeding this, It can be said that it contributes to high performance (long life, energy saving) of small motors.
- the lubricating base oil according to the present invention has a feature of low volatility and excellent low temperature fluidity, and can provide a lubricating oil composition capable of developing lubricity for a long period of time in a wide range from low temperature to high temperature.
- low torque especially low temperature driving performance
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- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
Description
式中、R1、R2は、独立に1-エチルペンチル基、n-ヘプチル基又はn-ヘキシル基である。そして、モル比(A:B:C)は、25~65:30~50:3~25の範囲にある。ここで、AはR1、R2が共にn-ヘプチル基又はn-ヘキシル基であるものであり、BはR1、R2の一方が1-エチルペンチル基であるものであり、CはR1、R2が共に1-エチルペンチル基であるものである。
1)流体軸受ユニット:軸外周面とスリーブ内周面のすきまに介在する潤滑油の油膜圧力によって回転軸を支持する軸受部を設け、潤滑剤として本発明の潤滑油組成物を用いた軸受ユニットである。2)流体動圧軸受ユニット:軸外周面とスリーブ内周面の何れか一方に動圧発生溝を設け、潤滑剤として本発明の潤滑油組成物を用いた軸受ユニットである。3)多孔質含油軸受ユニット:本発明の潤滑油組成物を含浸した多孔質含油軸受を有するものである。4)多孔質含油軸受:本発明の潤滑油組成物を含浸した軸受である。この多孔質含油軸受としては、動圧型多孔質含油軸受が好ましく挙げられる。5)スピンドルモータ:上記の軸受ユニットを備えたスピンドルモータである。
300cc四つ口フラスコ、加熱装置、撹拌装置、温度計、窒素通気管及び窒素ライン、ディーンスターク管、冷却管と冷却ラインから構成される反応装置に、脂肪族2価アルコールとして2-メチル-1,8-オクタンジオール24.05g、飽和脂肪族モノカルボン酸(以下、カルボン酸という)としてカプリル酸32.01g、2-エチルへキサン酸54.51gを入れ、テトラキス(IV)(2-エチル-1-ヘキシロキシ)チタネート0.1gを触媒とし、窒素雰囲気にて170℃、48時間攪拌しフルエステル化まで反応させた。反応油中に残ったカルボン酸の大部分を10Torr、170℃にて留去し、その後触媒を失活せしめ、エステル中に残った酸を中和、吸着処理にてエステル中の未反応物や不純物を除去し、ジエステル(D1)を得た。
実施例1と同様の方法で、2-メチル-1,8-オクタンジオール24.05gと、カルボン酸としてカプリル酸31.04g、2-エチルへキサン酸58.65gを原料としたものをエステル化し、ジエステル(D2)を得た。ジエステル(D2)の組成はA:B:C=45.0:44.1:10.9であり、A、B、Cの合計は全組成の96.0%であった。
実施例1と同様の方法で、2-メチル-1,8-オクタンジオール24.05gと、カルボン酸としてカプリル酸30.10g、2-エチルへキサン酸59.53gを原料としたものをエステル化し、ジエステル(D3)を得た。ジエステル(D3)の組成はA:B:C=42.9:45.8:11.3であり、A、B、Cの合計は全組成の95.5%であった。
実施例1と同様の方法で、原料に2-メチル-1,8-オクタンジオール83%、1,9-ノナンジオール15%で構成されるジオール24.05gを用い、それとカルボン酸としてカプリル酸29.04g、2-エチルへキサン酸59.53gを原料としたものをエステル化し、ジエステル(D4)を得た。ジエステル(D4)の組成はA:B:C=39.4:46.6:14.0であり、A、B、Cの合計は全組成の82.8%であった。
実施例2で合成したジエステル(D2)95wt%と、ネオペンチルグリコールのジエステル(Hatco社製)を5wt%を混合し、ジエステル(D5)を得た。
実施例2で合成したジエステル(D2)を70wt%と、H2962を30wt%混合し、ジエステル(D6)を得た。
実施例1と同様の方法で、2-メチル-1,8-オクタンジオール32.05gと、カルボン酸としてエナント酸46.87g、2-エチルへキサン酸68.50gを原料としたものをエステル化し、ジエステル(D11)を得た。ジエステル(D11)の組成はA:B:C=57.2:37.3:5.5であり、A、B、Cの合計は全組成の99.2%であった。
実施例1と同様の方法で、2-メチル-1,8-オクタンジオール32.05gと、カルボン酸としてエナント酸47.01g、2-エチルへキサン酸58.73gを原料としたものをエステル化し、ジエステル(D12)を得た。ジエステル(D12)の組成はA:B:C=62.4:33.2:4.4であり、A、B、Cの合計は全組成の99.2%であった。
実施例1と同様の方法で、2-メチル-1,8-オクタンジオールと、カルボン酸としてカプリル酸、2-エチルへキサン酸を原料としたものをエステル化し、ジエステル(D7)を得た。ジエステル(D7)の組成はA:B:C=74.5:23.5:2.0であり、A、B、Cの合計は全組成の98.0%であった。
実施例4と同様の方法で、原料に2-メチル-1,8-オクタンジオール83%、1,9-ノナンジオール15%で構成されるジオールを用い、それとカルボン酸としてカプリル酸、2-エチルへキサン酸を原料としたものをエステル化し、ジエステル(D8)を得た。ジエステル(D8)の組成はA:B:C=22.9:49.9:14.0であり、A、B、Cの合計は全組成の83.7%であった。
実施例1と同様の方法で、1,8-オクタンジオールと2-エチルへキサン酸を原料としてエステル化し、ジエステル(D9)を得た。
実施例1と同様の方法で、2,4-ジエチル-1,5-ペンタンジオールとカプリル酸を原料としたものをエステル化し、ジエステル(D10)を得た。
添加剤及び略号
L57:アルキルジフェニルアミン(BASF社製イルガノックスL57、酸化防止剤)
IR39:ベンゾトリアゾール誘導体(BASF製イルガメット39、金属不活性剤)
OAS1200:コハク酸イミド(シェブロンケミカル製OAS1200、無灰系分散剤)
実施例2、5又は6で得たジエステル(D2)、(D5)又は(D6)を基油とし、L57を0.5wt%、IR39を0.03wt%、及びOAS1200を1.5wt%配合して潤滑油組成物とした。
比較例3で得たジエステル(D9)を基油とし、L57を0.5wt%、IR39を0.03wt%、及びOAS1200を1.5wt%配合して潤滑油組成物とした。
測定機器はアントンパール製SVM-3000を用いた。
具体的には、実施例9の潤滑油組成物の蒸発減量が最も少なく、回転粘度も基準値以下である。また、基油の一部にポリオールエステルを使用した実施例10及び11も蒸発減量を大きく阻害することなく、粘度を低下させることが確認できた。なお、比較例5の潤滑油組成物は既存基油の中で最もバランスが良いとされ、多くの小型モーターで採用されているが、これを凌駕する性能を持つ潤滑油を開発したことは、小型モーターの高性能化(長寿命、省エネ)に寄与するものといえる。
Claims (6)
- 式(1)において、A:B:Cが、35~50:40~50:5~15の範囲にあることを特徴とする請求項1記載の潤滑油基油。
- 式(1)で示されるジエステルが、基油の50wt%以上であることを特徴とする請求項1記載の潤滑油基油。
- 40℃での動粘度が9mm2/s未満であり、粘度指数100以上のネオペンチルグリコール骨格を有したポリオールエステルである低粘度油を5~30wt%含むことを特徴とする請求項1に記載の潤滑油基油。
- 低粘度油が、カプリル酸又はカプリン酸と、ネオペンチルグリコールから得られるポリオールエステルである請求項4記載の潤滑油基油。
- 請求項1~5のいずれかに記載の潤滑油基油を用いて得られることを特徴とする潤滑油組成物。
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US13/634,005 US8889607B2 (en) | 2010-03-31 | 2011-03-31 | Lubricating oil composition |
CN2011800161440A CN102939364A (zh) | 2010-03-31 | 2011-03-31 | 润滑油组合物 |
EP11765742.9A EP2554640A4 (en) | 2010-03-31 | 2011-03-31 | OIL COMPOSITION |
JP2012509575A JP5719836B2 (ja) | 2010-03-31 | 2011-03-31 | 潤滑油組成物 |
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Cited By (4)
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WO2013027764A1 (ja) * | 2011-08-22 | 2013-02-28 | 協同油脂株式会社 | 流体動圧軸受用潤滑油基油、該基油を含有する流体動圧軸受用潤滑油及び該潤滑油を備えたスピンドルモータ |
JP2013133470A (ja) * | 2011-12-22 | 2013-07-08 | Samsung Electro-Mechanics Co Ltd | 流体動圧ベアリング用潤滑油組成物及びこれを用いたhdd用モータ |
JP2017507219A (ja) * | 2014-03-03 | 2017-03-16 | エレヴァンス リニューアブル サイエンシズ インコーポレイテッドElevance Renewable Sciences, Inc. | ベースストックとして、および潤滑油用途で用いるための、分岐ジエステル |
KR20210034016A (ko) | 2018-07-17 | 2021-03-29 | 고쿠리츠다이가쿠호징 야마나시다이가쿠 | 도전성 윤활제 |
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US5861147A (en) | 1997-06-09 | 1999-01-19 | The Procter & Gamble Company | Methods for controlling environmental odors on the body using compositions comprising uncomplexed cyclodextrins and perfume |
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CN102939364A (zh) | 2013-02-20 |
US8889607B2 (en) | 2014-11-18 |
EP2554640A4 (en) | 2013-11-20 |
US20130005630A1 (en) | 2013-01-03 |
JP5719836B2 (ja) | 2015-05-20 |
EP2554640A1 (en) | 2013-02-06 |
JPWO2011125842A1 (ja) | 2013-07-11 |
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