JP5477546B2 - Lubricating oil composition - Google Patents
Lubricating oil composition Download PDFInfo
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- JP5477546B2 JP5477546B2 JP2009130720A JP2009130720A JP5477546B2 JP 5477546 B2 JP5477546 B2 JP 5477546B2 JP 2009130720 A JP2009130720 A JP 2009130720A JP 2009130720 A JP2009130720 A JP 2009130720A JP 5477546 B2 JP5477546 B2 JP 5477546B2
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- base oil
- kinematic viscosity
- pour point
- ester
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- 239000010687 lubricating oil Substances 0.000 title claims description 24
- 239000000203 mixture Substances 0.000 title claims description 24
- 239000003921 oil Substances 0.000 claims description 50
- 239000002199 base oil Substances 0.000 claims description 40
- 238000002156 mixing Methods 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 6
- RDOFJDLLWVCMRU-UHFFFAOYSA-N Diisobutyl adipate Chemical group CC(C)COC(=O)CCCCC(=O)OCC(C)C RDOFJDLLWVCMRU-UHFFFAOYSA-N 0.000 claims description 4
- 229940031769 diisobutyl adipate Drugs 0.000 claims description 4
- XWVQUJDBOICHGH-UHFFFAOYSA-N dioctyl nonanedioate Chemical group CCCCCCCCOC(=O)CCCCCCCC(=O)OCCCCCCCC XWVQUJDBOICHGH-UHFFFAOYSA-N 0.000 claims description 3
- 238000005461 lubrication Methods 0.000 claims 1
- 150000002148 esters Chemical class 0.000 description 38
- 230000000052 comparative effect Effects 0.000 description 12
- 150000005690 diesters Chemical class 0.000 description 12
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 4
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- OJRJDENLRJHEJO-UHFFFAOYSA-N 2,4-diethylpentane-1,5-diol Chemical compound CCC(CO)CC(CC)CO OJRJDENLRJHEJO-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- WWZKQHOCKIZLMA-UHFFFAOYSA-N octanoic acid Chemical compound CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 description 3
- -1 polyol ester Chemical class 0.000 description 3
- YIWUKEYIRIRTPP-UHFFFAOYSA-N 2-ethylhexan-1-ol Chemical compound CCCCC(CC)CO YIWUKEYIRIRTPP-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- 235000011037 adipic acid Nutrition 0.000 description 2
- 239000001361 adipic acid Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- PYGXAGIECVVIOZ-UHFFFAOYSA-N Dibutyl decanedioate Chemical compound CCCCOC(=O)CCCCCCCCC(=O)OCCCC PYGXAGIECVVIOZ-UHFFFAOYSA-N 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- VCUFZILGIRCDQQ-KRWDZBQOSA-N N-[[(5S)-2-oxo-3-(2-oxo-3H-1,3-benzoxazol-6-yl)-1,3-oxazolidin-5-yl]methyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C1O[C@H](CN1C1=CC2=C(NC(O2)=O)C=C1)CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F VCUFZILGIRCDQQ-KRWDZBQOSA-N 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- MIMDHDXOBDPUQW-UHFFFAOYSA-N dioctyl decanedioate Chemical compound CCCCCCCCOC(=O)CCCCCCCCC(=O)OCCCCCCCC MIMDHDXOBDPUQW-UHFFFAOYSA-N 0.000 description 1
- VJHINFRRDQUWOJ-UHFFFAOYSA-N dioctyl sebacate Chemical compound CCCCC(CC)COC(=O)CCCCCCCCC(=O)OCC(CC)CCCC VJHINFRRDQUWOJ-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 239000005556 hormone Substances 0.000 description 1
- 229940088597 hormone Drugs 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229940035429 isobutyl alcohol Drugs 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000006078 metal deactivator Substances 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Sliding-Contact Bearings (AREA)
- Lubricants (AREA)
Description
本発明は、流動点が低くかつ低温時の動粘度が低い潤滑油組成物に関する。さらに詳細には、低温使用時の流動性や低トルク性が必要とされる流体軸受油又は含浸軸受油として好適な潤滑油組成物に関する。 The present invention relates to a lubricating oil composition having a low pour point and a low kinematic viscosity at low temperatures. More specifically, the present invention relates to a lubricating oil composition suitable as a fluid bearing oil or impregnated bearing oil that requires fluidity and low torque when used at low temperatures.
ＯＡ機器、ＡＶ機器、車載機器等の使用環境は、高温から低温まで幅広い温度範囲にわたっているが、近年、寒冷地での使用も考慮されるようになり、−４０℃での動作保証が必要不可欠になっている。
したがって、ハードディスクドライブに搭載された流体軸受や含浸軸受に使用される潤滑油においても、流動点が低くかつ低温時の動粘度が低いといった性能が要求される。
具体的には、−４０℃での動作保証の観点から流動点は−６０℃以下であることが望ましく、また、低温時の粘度増加による軸受トルクの増加は、消費電力の増大につながるため、動粘度は０℃で４５ｍｍ2／ｓ以下であることが望ましい。
The operating environment of OA equipment, AV equipment, in-vehicle equipment, etc. covers a wide temperature range from high temperature to low temperature, but in recent years, use in cold regions has also been considered, and operation guarantee at -40 ° C is indispensable. It has become.
Therefore, the lubricating oil used for fluid bearings and impregnated bearings mounted on hard disk drives is also required to have a low pour point and low kinematic viscosity at low temperatures.
Specifically, the pour point is desirably −60 ° C. or less from the viewpoint of operation guarantee at −40 ° C., and an increase in bearing torque due to an increase in viscosity at low temperatures leads to an increase in power consumption. The kinematic viscosity is desirably 45 mm 2 / s or less at 0 ° C.
上記要求性能を満足する潤滑油としては、低温性に優れるジエステルが挙げられる。例えば、アジピン酸と２−エチルヘキシルアルコールのジエステルであるＤＯＡは、流動点が−６０℃以下と低く、０℃の動粘度も４５ｍｍ2／ｓ以下と低い事から上記要求性能を満足する。しかし、近年、環境ホルモンの疑いのある物質としてリストアップされているため、潤滑油への使用は困難である。
他のジエステル油としては、アゼライン酸やセバシン酸と２−エチルヘキシルアルコールとのジエステルであるＤＯＺやＤＯＳも挙げられるが、どちらも流動点は−６０℃以下と低く優れるものの、０℃の動粘度がＤＯＡよりも高く上記要求性能を満足しない。
また、セバシン酸とブチルアルコールのジエステルであるＤＢＳやアジピン酸とイソブチルアルコールのジエステルであるＤＩＢＡといった低分子量のジエステルも挙げられるが、どちらも０℃の動粘度はＤＯＡよりも低く優れるものの、−２０℃前後で結晶化してしまい上記要求性能を満足しない。
Examples of the lubricating oil that satisfies the required performance include diesters that are excellent in low-temperature properties. For example, DOA, which is a diester of adipic acid and 2-ethylhexyl alcohol, satisfies the above required performance because the pour point is as low as −60 ° C. or less and the kinematic viscosity at 0 ° C. is as low as 45 mm 2 / s or less. However, since it has been listed as a suspected environmental hormone in recent years, it is difficult to use it as a lubricating oil.
Other diester oils include DOZ and DOS, which are diesters of azelaic acid or sebacic acid and 2-ethylhexyl alcohol, both of which have a low pour point of −60 ° C. or lower, but have a kinematic viscosity of 0 ° C. It is higher than DOA and does not satisfy the required performance.
Also, low molecular weight diesters such as DBS which is a diester of sebacic acid and butyl alcohol and DIBA which is a diester of adipic acid and isobutyl alcohol are mentioned. Crystallization occurs at around ℃ and does not satisfy the required performance.
以上のように、ジエステル単体で流動点と動粘度の両性能を満足することは非常に困難である。そこで、２種類のエステルを混合する事で流動点を改善した例も報告されている。例えば、特許文献１では、低温の動粘度が低いポリオールエステルとＤＢＳやＤＩＢＡを特定の比率で混合することにより、流動点を−４０℃代まで改善している。しかし、−４０℃での長期使用を考慮した場合、経時で結晶の析出等が懸念され、動作保証の観点から上記要求性能を十分に満足しているとはいえない。 As described above, it is very difficult to satisfy both the pour point and kinematic viscosity performance with the diester alone. Therefore, an example in which the pour point is improved by mixing two kinds of esters has been reported. For example, in Patent Document 1, the pour point is improved to the -40 ° C range by mixing a polyol ester having low kinematic viscosity at low temperature and DBS or DIBA at a specific ratio. However, considering long-term use at −40 ° C., there is a concern about crystal precipitation over time, and it cannot be said that the above required performance is sufficiently satisfied from the viewpoint of operation guarantee.
したがって、本発明が解決しようとする課題は、流動点を低く維持しつつ、低温時の動粘度が低い潤滑油組成物を提供することである。
上記潤滑油組成物を基油とした流体軸受油又は含浸軸受油を提供することである。
Therefore, the problem to be solved by the present invention is to provide a lubricating oil composition having a low kinematic viscosity at low temperatures while maintaining a low pour point.
It is to provide a fluid bearing oil or an impregnated bearing oil using the lubricating oil composition as a base oil.
本発明者は、上記課題に対し、流動点の低いエステル系合成油と低温時の動粘度が低いエステル系合成油を混合する事により、これを改善した。本発明は以下に示す潤滑油組成物を提供するものである。
１．第１の基油と第２の基油を含み、流動点が−６０℃以下で０℃の動粘度が４５ｍｍ2／ｓ以下である潤滑油組成物であって、第１の基油は、流動点が−６０℃以下で０℃の動粘度が４５〜６０ｍｍ2／ｓのエステル系合成油であり、第２の基油は、流動点が−１５℃〜−２５℃で０℃の動粘度が１０〜２０ｍｍ2／ｓのエステル系合成油であることを特徴とする潤滑油組成物。
２．第１の基油が、アゼライン酸ジオクチル、または、２，４−ジエチル−１，５−ペンタンジオールとｎ−オクチル酸のジエステルであることを特徴とする上記１記載の潤滑油組成物。
３．第２の基油が、アジピン酸ジイソブチルであることを特徴とする上記１又は２記載の潤滑油組成物。
４．第２の基油の配合割合が、第１の基油と第２の基油の合計量に対して、１．０〜５０．０質量％であることを特徴とする上記１〜３のいずれか１項記載の潤滑油組成物。
５．上記１〜４のいずれか１項記載の潤滑油組成物を基油とした流体軸受油又は含浸軸受油。
The present inventor has solved this problem by mixing an ester synthetic oil having a low pour point and an ester synthetic oil having a low kinematic viscosity at low temperatures. The present invention provides the following lubricating oil composition.
1. A lubricating oil composition comprising a first base oil and a second base oil, having a pour point of −60 ° C. or less and a kinematic viscosity at 0 ° C. of 45 mm 2 / s or less, wherein the first base oil is: It is an ester-based synthetic oil having a pour point of −60 ° C. or less and a kinematic viscosity at 0 ° C. of 45 to 60 mm 2 / s. The second base oil has a pour point of −15 ° C. to −25 ° C. A lubricating oil composition characterized by being an ester-based synthetic oil having a viscosity of 10 to 20 mm 2 / s.
2. 2. The lubricating oil composition according to 1 above, wherein the first base oil is dioctyl azelate or a diester of 2,4-diethyl-1,5-pentanediol and n-octylic acid.
3. 3. The lubricating oil composition as described in 1 or 2 above, wherein the second base oil is diisobutyl adipate.
4). Any of the above 1 to 3, wherein the blending ratio of the second base oil is 1.0 to 50.0 mass% with respect to the total amount of the first base oil and the second base oil The lubricating oil composition according to claim 1.
5. 5. Fluid bearing oil or impregnated bearing oil using the lubricating oil composition according to any one of 1 to 4 as a base oil.
本発明の潤滑油組成物は、流動点が低く、かつ、低温時の動粘度が低い。従って、流体軸受油や含浸軸受油の基油として好適である。 The lubricating oil composition of the present invention has a low pour point and a low kinematic viscosity at low temperatures. Therefore, it is suitable as a base oil for fluid bearing oil and impregnated bearing oil.
本発明の潤滑油組成物には、流動点や低温での安定性を向上させるため、第１の基油として流動点が−６０℃以下で０℃の動粘度が４５〜６０ｍｍ2／ｓのエステル系合成油が使用されている。
第１の基油の例としては、セバシン酸ジオクチル、アゼライン酸ジオクチルといったジカルボン酸とアルコールのジエステルや２，４−ジエチル−１，５−ペンタンジオールとｎ−オクチル酸のジエステルといったジアルコールとカルボン酸のジエステル等が挙げられる。また、これらのジエステルは、２種以上を適宜配合して使用することも可能である。
In the lubricating oil composition of the present invention, the first base oil has a pour point of −60 ° C. or lower and a kinematic viscosity at 0 ° C. of 45 to 60 mm 2 / s in order to improve stability at a pour point or low temperature. Ester-based synthetic oil is used.
Examples of the first base oil include dialcohols and carboxylic acids such as dicarboxylic acid and alcohol diesters such as dioctyl sebacate and dioctyl azelate and diesters of 2,4-diethyl-1,5-pentanediol and n-octylic acid. And the like. Moreover, these diesters can also be used by appropriately blending two or more thereof.
本発明の潤滑油組成物には、低温での動粘度を下げるため、第２の基油として流動点が−１５℃〜−２５℃で０℃の動粘度が１０〜２０ｍｍ2／ｓのエステル系合成油が使用されている。
第２の基油の例としては、アジピン酸ジイソブチルが挙げられる。
第２の基油の配合割合は、第１の基油と第２の基油の合計量に対して。好ましくは１．０〜５０．０質量％、さらに好ましくは５．０〜５０．０質量％、最も好ましくは１０．０〜３０．０質量％である。
第２の基油の配合割合が１．０質量％未満では、動粘度の十分な低下が認められない傾向があり、混合割合が５０質量％を超えると流動点や低温安定性が悪化する傾向がある。
In order to lower the kinematic viscosity at a low temperature, the lubricating oil composition of the present invention is an ester having a pour point of −15 ° C. to −25 ° C. and a kinematic viscosity of 0 ° C. of 10 to 20 mm 2 / s as the second base oil. Synthetic oil is used.
An example of the second base oil is diisobutyl adipate.
The blending ratio of the second base oil is based on the total amount of the first base oil and the second base oil. Preferably it is 1.0-50.0 mass%, More preferably, it is 5.0-50.0 mass%, Most preferably, it is 10.0-30.0 mass%.
When the blending ratio of the second base oil is less than 1.0% by mass, a sufficient decrease in kinematic viscosity tends not to be observed, and when the mixing ratio exceeds 50% by mass, the pour point and low-temperature stability tend to deteriorate. There is.
本発明の潤滑油組成物には、摩耗防止剤、極圧剤、油性剤、防錆剤、金属不活性剤、粘度指数向上剤、流動点降下剤、加水分解防止剤、帯電防止剤、消泡剤等必要に応じて全ての添加剤が使用可能である。また、これらの添加剤は、１種又は２種以上の添加剤を適宜配合することも可能である。
実施例１−６及び比較例１−１０
表１及び表２に示す成分を含む潤滑油組成物を調製した。
第１の基油（流動点が−６０℃以下で０℃の動粘度が４５〜６０ｍｍ2／ｓのエステル系合成油）
エステル系合成油Ａ：アゼライン酸ジオクチル
エステル系合成油Ｂ：２，４−ジエチル−１，５−ペンタンジオールとｎ−オクチル酸のジエステル
第２の基油（流動点が−１５℃〜−２５℃で０℃の動粘度が１０〜２０ｍｍ2／ｓのエステル系合成油）
エステル系合成油Ｃ：アジピン酸ジイソブチル
比較例の基油
エステル系合成油Ｄ：セバシン酸ジブチル
The lubricating oil composition of the present invention includes an antiwear agent, extreme pressure agent, oiliness agent, rust inhibitor, metal deactivator, viscosity index improver, pour point depressant, hydrolysis inhibitor, antistatic agent, All additives such as foaming agents can be used as required. Moreover, these additives can also mix | blend 1 type (s) or 2 or more types of additives suitably.
Example 1-6 and Comparative Example 1-10
Lubricating oil compositions containing the components shown in Tables 1 and 2 were prepared.
First base oil (ester synthetic oil having a pour point of −60 ° C. or less and a kinematic viscosity at 0 ° C. of 45 to 60 mm 2 / s)
Ester-based synthetic oil A: Dioctyl azelate Ester-based synthetic oil B: Diester second base oil of 2,4-diethyl-1,5-pentanediol and n-octylic acid (pour point is -15 ° C to -25 ° C) Ester-based synthetic oil having a kinematic viscosity at 0 ° C. of 10 to 20 mm 2 / s)
Ester-based synthetic oil C: Base oil of diisobutyl adipate comparative example Ester-based synthetic oil D: Dibutyl sebacate
＜試験方法＞
［動粘度測定］
試験方法：ＪＩＳ Ｋ ２２８３に準ずる。
［流動点測定］
試験方法：ＪＩＳ Ｋ ２２６９に準ずる。
［低温安定性試験］
試験温度：−３０℃、−４０℃
試験時間：５００ｈ
試験方法：２０ｍｌのサンプルビンに試料を５ｇ量り採り、規定温度の恒温槽内に規定時間静置する。静置後、結晶の析出の有無を目視により確認する。
結果を表１及び表２に示す。
<Test method>
[Kinematic viscosity measurement]
Test method: According to JIS K 2283.
[Pour point measurement]
Test method: According to JIS K 2269.
[Low temperature stability test]
Test temperature: -30 ° C, -40 ° C
Test time: 500h
Test method: Weigh 5 g of sample in a 20 ml sample bottle, and leave it in a constant temperature bath at a specified temperature for a specified time. After standing, the presence or absence of crystal precipitation is confirmed visually.
The results are shown in Tables 1 and 2.
＜エステル系合成油Ａに対する効果＞
エステル系合成油Ａ（第１の基油）に、エステル系合成油Ｃ（第２の基油）を混合した実施例１〜３は、エステル系合成油Ａ単体である比較例１に比べ、低温の動粘度の改善が認められる。
エステル系合成油Ａ（第１の基油）に、エステル系合成油Ｄ（比較例の基油）を混合した比較例４〜６は、エステル系合成油Ａ単体である比較例１に比べ、低温の動粘度の改善が認められる。
実施例１〜３と比較例４〜６とを比べると、エステル系合成油Ｃは、エステル系合成油Ａの流動点及び低温安定性を維持しつつ、低温の動粘度が改善しているのに対し、エステル系合成油Ｄは、低温の動粘度は改善するものの、エステル系合成油Ａよりも流動点及び低温安定性の悪化が認められ、改善効果はエステル系合成油Ｃの方が優れる。
<Effect on ester-based synthetic oil A>
Examples 1 to 3 in which ester synthetic oil C (second base oil) is mixed with ester synthetic oil A (first base oil) are compared with Comparative Example 1 in which ester synthetic oil A is simple, An improvement in kinematic viscosity at low temperatures is observed.
Comparative Examples 4 to 6 in which ester synthetic oil A (first base oil) and ester synthetic oil D (base oil of a comparative example) are mixed are compared with Comparative Example 1 which is an ester synthetic oil A alone. An improvement in kinematic viscosity at low temperatures is observed.
Comparing Examples 1 to 3 with Comparative Examples 4 to 6, the ester synthetic oil C has improved kinematic viscosity at low temperature while maintaining the pour point and low temperature stability of the ester synthetic oil A. On the other hand, although the ester synthetic oil D improves the kinematic viscosity at low temperature, the pour point and the low temperature stability are deteriorated more than the ester synthetic oil A, and the improvement effect of the ester synthetic oil C is superior. .
＜エステル系合成油Ｂに対する効果＞
エステル系合成油Ｂ（第１の基油）に、エステル系合成油Ｃ（第２の基油）を混合した実施例４〜６は、エステル系合成油Ａ単体である比較例７に比べ、低温の動粘度の改善が認められる。
エステル系合成油Ｂに、エステル系合成油Ｄ（比較例の基油）を混合した比較例８〜１０は、エステル系合成油Ａ単体である比較例７に比べ、低温の動粘度の改善が認められる。
実施例４〜６と比較例８〜１０とを比較すると、エステル系合成油Ｃは、エステル系合成油Ｂの流動点及び低温安定性を維持しつつ、低温の動粘度が改善しているのに対し、エステル系合成油Ｄは、低温の動粘度は改善するものの、エステル系合成油Ｂよりも流動点及び低温安定性の悪化が認められ、改善効果はエステル系合成油Ｃの方が優れる。
<Effect on ester-based synthetic oil B>
Examples 4-6 which mixed ester system synthetic oil C (2nd base oil) with ester system synthetic oil B (1st base oil) are compared with comparative example 7 which is ester system synthetic oil A simple substance, An improvement in kinematic viscosity at low temperatures is observed.
Comparative Examples 8-10, in which ester synthetic oil B is mixed with ester synthetic oil D (a base oil of a comparative example), are improved in kinematic viscosity at a low temperature as compared with Comparative Example 7 which is an ester synthetic oil A alone. Is recognized.
Comparing Examples 4 to 6 and Comparative Examples 8 to 10, the ester synthetic oil C has improved kinematic viscosity at low temperature while maintaining the pour point and low temperature stability of the ester synthetic oil B. On the other hand, although the ester synthetic oil D improves the kinematic viscosity at low temperature, the pour point and low temperature stability are worsened than the ester synthetic oil B, and the ester synthetic oil C is more effective for improvement. .
以上より、流動点が−６０℃以下で、０℃の動粘度が４５〜６０ｍｍ2／ｓのエステル系合成油Ａ又はＢ（第１の基油）と、流動点が−１５℃〜−２５℃で、０℃の動粘度が１０〜２０ｍｍ2／ｓのエステル系合成油Ｃ（第２の基油）とを混合することにより、流動点が−６０℃以下と優れかつ０℃の動粘度が４５ｍｍ2／ｓ以下と低い値を示す潤滑油組成物が達成された。 As mentioned above, the pour point is −60 ° C. or less, the kinematic viscosity at 0 ° C. is 45 to 60 mm 2 / s, the ester synthetic oil A or B (first base oil), and the pour point is −15 ° C. to −25. When mixed with an ester synthetic oil C (second base oil) having a kinematic viscosity at 0 ° C of 10 to 20 mm 2 / s at 0 ° C, the pour point is excellent at -60 ° C or lower and the kinematic viscosity at 0 ° C. A lubricating oil composition having a low value of 45 mm 2 / s or less was achieved.
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