JP2015098592A - Lubricant composition for reduction gear of hybrid car or electric car - Google Patents
Lubricant composition for reduction gear of hybrid car or electric car Download PDFInfo
- Publication number
- JP2015098592A JP2015098592A JP2014213885A JP2014213885A JP2015098592A JP 2015098592 A JP2015098592 A JP 2015098592A JP 2014213885 A JP2014213885 A JP 2014213885A JP 2014213885 A JP2014213885 A JP 2014213885A JP 2015098592 A JP2015098592 A JP 2015098592A
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- JP
- Japan
- Prior art keywords
- lubricating oil
- content
- oil composition
- acid
- branched
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 239000000203 mixture Substances 0.000 title claims abstract description 105
- 239000000314 lubricant Substances 0.000 title claims abstract description 14
- 239000002199 base oil Substances 0.000 claims abstract description 77
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 35
- 239000011574 phosphorus Substances 0.000 claims abstract description 35
- 230000000994 depressogenic effect Effects 0.000 claims abstract description 34
- 239000010687 lubricating oil Substances 0.000 claims description 87
- 239000000654 additive Substances 0.000 claims description 54
- 230000000996 additive effect Effects 0.000 claims description 49
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 38
- 239000011593 sulfur Substances 0.000 claims description 37
- 229910052717 sulfur Inorganic materials 0.000 claims description 37
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 22
- 229910052796 boron Inorganic materials 0.000 claims description 22
- 230000001050 lubricating effect Effects 0.000 claims description 19
- 239000000470 constituent Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000005299 abrasion Methods 0.000 abstract description 6
- 239000000446 fuel Substances 0.000 abstract description 6
- 150000002148 esters Chemical class 0.000 description 34
- 239000002253 acid Substances 0.000 description 24
- -1 isoparaffins Chemical class 0.000 description 20
- 239000004034 viscosity adjusting agent Substances 0.000 description 20
- 125000004432 carbon atom Chemical group C* 0.000 description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 17
- 239000004711 α-olefin Substances 0.000 description 13
- 229920013639 polyalphaolefin Polymers 0.000 description 12
- 229920000193 polymethacrylate Polymers 0.000 description 12
- 229920001577 copolymer Polymers 0.000 description 10
- 239000003921 oil Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- 239000003638 chemical reducing agent Substances 0.000 description 9
- 150000005846 sugar alcohols Polymers 0.000 description 9
- 150000004678 hydrides Chemical class 0.000 description 8
- KZNICNPSHKQLFF-UHFFFAOYSA-N succinimide Chemical class O=C1CCC(=O)N1 KZNICNPSHKQLFF-UHFFFAOYSA-N 0.000 description 8
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 7
- 125000003342 alkenyl group Chemical group 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000002480 mineral oil Substances 0.000 description 7
- 235000010446 mineral oil Nutrition 0.000 description 7
- 150000007519 polyprotic acids Polymers 0.000 description 7
- 150000003839 salts Chemical class 0.000 description 7
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 6
- 125000000217 alkyl group Chemical group 0.000 description 6
- 239000003963 antioxidant agent Substances 0.000 description 6
- 239000003599 detergent Substances 0.000 description 6
- 239000002270 dispersing agent Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000000178 monomer Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 235000014113 dietary fatty acids Nutrition 0.000 description 5
- 238000000921 elemental analysis Methods 0.000 description 5
- 229930195729 fatty acid Natural products 0.000 description 5
- 239000000194 fatty acid Substances 0.000 description 5
- 239000003607 modifier Substances 0.000 description 5
- YIWUKEYIRIRTPP-UHFFFAOYSA-N 2-ethylhexan-1-ol Chemical compound CCCCC(CC)CO YIWUKEYIRIRTPP-UHFFFAOYSA-N 0.000 description 4
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 4
- WTEOIRVLGSZEPR-UHFFFAOYSA-N boron trifluoride Chemical compound FB(F)F WTEOIRVLGSZEPR-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 150000004665 fatty acids Chemical class 0.000 description 4
- 150000002430 hydrocarbons Chemical group 0.000 description 4
- 239000003112 inhibitor Substances 0.000 description 4
- 239000006078 metal deactivator Substances 0.000 description 4
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 4
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 4
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- WWZKQHOCKIZLMA-UHFFFAOYSA-N Caprylic acid Natural products CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 150000001412 amines Chemical class 0.000 description 3
- 239000002518 antifoaming agent Substances 0.000 description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- 235000011187 glycerol Nutrition 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- HEBKCHPVOIAQTA-UHFFFAOYSA-N meso ribitol Natural products OCC(O)C(O)C(O)CO HEBKCHPVOIAQTA-UHFFFAOYSA-N 0.000 description 3
- 229920002223 polystyrene Polymers 0.000 description 3
- 235000013772 propylene glycol Nutrition 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 231100000241 scar Toxicity 0.000 description 3
- 229960002317 succinimide Drugs 0.000 description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 3
- 239000003643 water by type Substances 0.000 description 3
- PUPZLCDOIYMWBV-UHFFFAOYSA-N (+/-)-1,3-Butanediol Chemical compound CC(O)CCO PUPZLCDOIYMWBV-UHFFFAOYSA-N 0.000 description 2
- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-N 0.000 description 2
- ARXKVVRQIIOZGF-UHFFFAOYSA-N 1,2,4-butanetriol Chemical compound OCCC(O)CO ARXKVVRQIIOZGF-UHFFFAOYSA-N 0.000 description 2
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical compound CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 description 2
- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 2
- CRSBERNSMYQZNG-UHFFFAOYSA-N 1-dodecene Chemical compound CCCCCCCCCCC=C CRSBERNSMYQZNG-UHFFFAOYSA-N 0.000 description 2
- BBMCTIGTTCKYKF-UHFFFAOYSA-N 1-heptanol Chemical compound CCCCCCCO BBMCTIGTTCKYKF-UHFFFAOYSA-N 0.000 description 2
- JRZJOMJEPLMPRA-UHFFFAOYSA-N 1-nonene Chemical compound CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 2
- BTVWZWFKMIUSGS-UHFFFAOYSA-N 2-methylpropane-1,2-diol Chemical compound CC(C)(O)CO BTVWZWFKMIUSGS-UHFFFAOYSA-N 0.000 description 2
- 229910015900 BF3 Inorganic materials 0.000 description 2
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 2
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 2
- SRBFZHDQGSBBOR-IOVATXLUSA-N D-xylopyranose Chemical compound O[C@@H]1COC(O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-IOVATXLUSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical group OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- QCNWZROVPSVEJA-UHFFFAOYSA-N Heptadecanedioic acid Chemical compound OC(=O)CCCCCCCCCCCCCCCC(O)=O QCNWZROVPSVEJA-UHFFFAOYSA-N 0.000 description 2
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical compound CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 2
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229920002367 Polyisobutene Polymers 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 150000001342 alkaline earth metals Chemical class 0.000 description 2
- 150000004996 alkyl benzenes Chemical class 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- PYMYPHUHKUWMLA-UHFFFAOYSA-N arabinose Natural products OCC(O)C(O)C(O)C=O PYMYPHUHKUWMLA-UHFFFAOYSA-N 0.000 description 2
- 229960002255 azelaic acid Drugs 0.000 description 2
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 2
- 239000012964 benzotriazole Substances 0.000 description 2
- WGQKYBSKWIADBV-UHFFFAOYSA-N benzylamine Chemical compound NCC1=CC=CC=C1 WGQKYBSKWIADBV-UHFFFAOYSA-N 0.000 description 2
- SRBFZHDQGSBBOR-UHFFFAOYSA-N beta-D-Pyranose-Lyxose Natural products OC1COC(O)C(O)C1O SRBFZHDQGSBBOR-UHFFFAOYSA-N 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- MWKFXSUHUHTGQN-UHFFFAOYSA-N decan-1-ol Chemical compound CCCCCCCCCCO MWKFXSUHUHTGQN-UHFFFAOYSA-N 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 description 2
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- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- JFCQEDHGNNZCLN-UHFFFAOYSA-N glutaric acid Chemical compound OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 description 2
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- ISYWECDDZWTKFF-UHFFFAOYSA-N nonadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCCC(O)=O ISYWECDDZWTKFF-UHFFFAOYSA-N 0.000 description 2
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- 239000003208 petroleum Substances 0.000 description 2
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- 150000004867 thiadiazoles Chemical class 0.000 description 2
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Landscapes
- Lubricants (AREA)
Abstract
Description
本発明は、ハイブリッド車又は電気自動車の減速機用潤滑油組成物に関する。 The present invention relates to a lubricating oil composition for a speed reducer of a hybrid vehicle or an electric vehicle.
近年、地球環境保護の観点から、二酸化炭素削減が強く求められており、そのため、自動車の分野では、省燃費技術の開発に力が注がれている。省燃費化の主流にハイブリッド車及び電気自動車があり、今後急速に普及すると予測されている。ハイブリッド車及び電気自動車は電動モーター、発電機、インバータ、蓄電池等を有することが特徴であり、一部又は全部が電動モーターで走行する。 In recent years, there has been a strong demand for carbon dioxide reduction from the viewpoint of global environmental protection. Therefore, in the field of automobiles, efforts are being made to develop fuel-saving technologies. Hybrid vehicles and electric vehicles are the mainstream for fuel saving, and are expected to spread rapidly in the future. A hybrid vehicle and an electric vehicle are characterized by having an electric motor, a generator, an inverter, a storage battery, and the like, and a part or all of the vehicle is driven by the electric motor.
このようなハイブリッド車及び電気自動車における伝導モーター及び発電機の冷却には、ATF(オートマチック・トランスミッション・フルード)及びCVTF(コンティニュアスリー・バリアブル・トランスミッション・フルード)が使用されている。ATF及びCVTFには、一般に基油として、鉱物油、ポリα−オレフィン等の合成油が使用されている。一方、ハイブリッド車及び電気自動車は歯車減速機を有する形式であり、低温流動性と潤滑性の双方を兼ね備えることが必要とされる。今後、ハイブリッド車及び電気自動車において、燃費、電費等を改善させるにためは、電動モーター、発電機等の低温流動性に優れる潤滑油が望まれ、さらに潤滑油の低粘度化が必要とされる。 ATF (automatic transmission fluid) and CVTF (continuous variable transmission fluid) are used for cooling the conduction motor and the generator in such hybrid vehicles and electric vehicles. In ATF and CVTF, synthetic oils such as mineral oil and poly α-olefin are generally used as base oils. On the other hand, hybrid vehicles and electric vehicles have a gear reducer and are required to have both low-temperature fluidity and lubricity. In the future, in order to improve fuel economy, electricity consumption, etc. in hybrid vehicles and electric vehicles, lubricating oils with excellent low-temperature fluidity, such as electric motors and generators, are desired, and it is necessary to lower the viscosity of the lubricating oil. .
従来の自動変速機用潤滑油組成物としては、低粘度であっても疲労寿命が長く、耐久性等にバランス良く優れたものとして、潤滑油基油に各種添加剤を配合したものが提案されている(例えば、特許文献1参照。)。 As a conventional lubricating oil composition for automatic transmissions, it has been proposed that various additives are added to a lubricating base oil as having a long fatigue life even with low viscosity and excellent balance in durability. (For example, refer to Patent Document 1).
しかしながら、ハイブリッド車又は電気自動車の歯車減速機、特に電動モーター又はインホイールモーター、中でもインホイールモーターに用いられる潤滑油は、自動変速機及び無段変速機と比較して、少量となるため、過酷なせん断を受けることによって粘度が低下し、耐摩耗性をはじめとする潤滑性能が悪化する場合があった。 However, the amount of lubricating oil used for gear reducers of hybrid vehicles or electric vehicles, particularly electric motors or in-wheel motors, and in particular in-wheel motors, is small compared to automatic transmissions and continuously variable transmissions. When subjected to proper shearing, the viscosity decreases, and the lubricating performance including wear resistance may deteriorate.
本発明はこのような実情に鑑みてなされたものであり、低温流動性及びせん断安定性に優れ、省燃費化が可能な耐摩耗性及び疲労寿命に優れたハイブリッド車又は電気自動車の減速機用潤滑油組成物を提供することを目的とする。 The present invention has been made in view of such circumstances, and is excellent in low-temperature fluidity and shear stability, and has excellent wear resistance and fatigue life that can reduce fuel consumption. It is an object to provide a lubricating oil composition.
上記課題を解決するために、本発明は、下記[1]及び[2]に示す潤滑油組成物、下記[3]に示す組成物の使用、並びに下記[4]に示す組成物の製造のための使用を提供する。 In order to solve the above problems, the present invention provides a lubricating oil composition shown in the following [1] and [2], use of the composition shown in the following [3], and production of the composition shown in the following [4]. Provide use for.
[1]合成系基油を含み、25℃でのトラクション係数が0.007以下である潤滑油基油と、重量平均分子量が40000〜100000の流動点降下剤と、を含有し、潤滑油組成物全量基準で、流動点降下剤の含有量が0.1〜1.0質量%であり、下記式(1)を満たす、ハイブリッド車又は電気自動車の減速機用潤滑油組成物。
0.01≦[CS/(CB×CP)]≦0.025 (1)
[式中、CSは潤滑油組成物中の硫黄含有量を示し、CBは潤滑油組成物中のホウ素含有量を示し、CPは潤滑油組成物中のリン含有量を示し、CS、CB及びCPはいずれも潤滑油組成物全量基準での含有量(質量)である。]
[2]リン及び硫黄を含む添加剤と、ホウ素を含む添加剤と、をさらに含有し、前記リン及び硫黄を含む添加剤が、構成元素としてリンを含み硫黄を含まない第1の添加剤と構成元素として硫黄を含みリンを含まない第2の添加剤との組合せ、構成元素としてリン及び硫黄の両方を含む第3の添加剤、前記第1の添加剤と前記第3の添加剤との組合せ、前記第2の添加剤と前記第3の添加剤との組合せ、並びに、前記第1の添加剤と前記第2の添加剤と前記第3の添加剤との組合せからなる群より選ばれる1種である、[1]に記載のハイブリッド車又は電気自動車の減速機用潤滑油組成物。
[1] A lubricating oil composition comprising a lubricating base oil containing a synthetic base oil and having a traction coefficient of 0.007 or less at 25 ° C. and a pour point depressant having a weight average molecular weight of 40,000 to 100,000. A lubricating oil composition for a speed reducer of a hybrid vehicle or an electric vehicle, wherein the content of the pour point depressant is 0.1 to 1.0% by mass based on the total amount of matter and satisfies the following formula (1).
0.01 ≦ [C S / (C B × C P )] ≦ 0.025 (1)
[Wherein C S represents the sulfur content in the lubricating oil composition, C B represents the boron content in the lubricating oil composition, C P represents the phosphorus content in the lubricating oil composition, and C S, is a content at C B and C P are both lubricating oil composition the total amount (mass). ]
[2] An additive containing phosphorus and sulfur, and an additive containing boron, and the additive containing phosphorus and sulfur includes phosphorus as a constituent element and no sulfur. Combination with a second additive containing sulfur as a constituent element and not containing phosphorus, a third additive containing both phosphorus and sulfur as constituent elements, the first additive and the third additive Selected from the group consisting of a combination, a combination of the second additive and the third additive, and a combination of the first additive, the second additive and the third additive. The lubricating oil composition for a speed reducer of a hybrid vehicle or an electric vehicle according to [1], which is one type.
[3]組成物のハイブリッド車又は電気自動車の減速機用潤滑油としての使用であって、前記組成物が、合成系基油を含み、25℃でのトラクション係数が0.007以下である潤滑油基油と、重量平均分子量が40000〜100000の流動点降下剤と、を含有し、潤滑油組成物全量基準で、前記流動点降下剤の含有量が0.1〜1.0質量%であり、下記式(1)を満たす、使用。
0.01≦[CS/(CB×CP)]≦0.025 (1)
[式中、CSは潤滑油組成物中の硫黄含有量を示し、CBは潤滑油組成物中のホウ素含有量を示し、CPは潤滑油組成物中のリン含有量を示し、CS、CB及びCPはいずれも潤滑油組成物全量基準での含有量(質量)である。]
[4]組成物のハイブリッド車又は電気自動車の減速機用潤滑油の製造のための使用であって、前記組成物が、合成系基油を含み、25℃でのトラクション係数が0.007以下である潤滑油基油と、重量平均分子量が40000〜100000の流動点降下剤と、を含有し、潤滑油組成物全量基準で、前記流動点降下剤の含有量が0.1〜1.0質量%であり、下記式(1)を満たす、使用。
0.01≦[CS/(CB×CP)]≦0.025 (1)
[式中、CSは潤滑油組成物中の硫黄含有量を示し、CBは潤滑油組成物中のホウ素含有量を示し、CPは潤滑油組成物中のリン含有量を示し、CS、CB及びCPはいずれも潤滑油組成物全量基準での含有量(質量)である。]
[3] Use of the composition as a lubricant for a reduction gear of a hybrid vehicle or an electric vehicle, wherein the composition includes a synthetic base oil and a traction coefficient at 25 ° C. is 0.007 or less. An oil base oil and a pour point depressant having a weight average molecular weight of 40,000 to 100,000, and based on the total amount of the lubricating oil composition, the content of the pour point depressant is 0.1 to 1.0% by mass. Yes, satisfying the following formula (1).
0.01 ≦ [C S / (C B × C P )] ≦ 0.025 (1)
[Wherein C S represents the sulfur content in the lubricating oil composition, C B represents the boron content in the lubricating oil composition, C P represents the phosphorus content in the lubricating oil composition, and C S, is a content at C B and C P are both lubricating oil composition the total amount (mass). ]
[4] Use of the composition for producing a lubricant for a reduction gear of a hybrid vehicle or an electric vehicle, wherein the composition contains a synthetic base oil and a traction coefficient at 25 ° C. is 0.007 or less. And a pour point depressant having a weight average molecular weight of 40,000 to 100,000, and based on the total amount of the lubricating oil composition, the content of the pour point depressant is 0.1 to 1.0. Use which is mass% and satisfies the following formula (1).
0.01 ≦ [C S / (C B × C P )] ≦ 0.025 (1)
[Wherein C S represents the sulfur content in the lubricating oil composition, C B represents the boron content in the lubricating oil composition, C P represents the phosphorus content in the lubricating oil composition, and C S, is a content at C B and C P are both lubricating oil composition the total amount (mass). ]
本発明によれば、低温流動性及びせん断安定性に優れ、省燃費化が可能な耐摩耗性及び疲労寿命に優れた潤滑油組成物が提供される。したがって、ハイブリッド車又は電気自動車の減速機用、特に電動モーター用又はインホイールモーター用に適用した場合に、減速機油として必要な特性を維持しつつ、省燃費性を達成することができる。中でも補助動力源がない電気自動車用として好適である。 ADVANTAGE OF THE INVENTION According to this invention, the lubricating oil composition which was excellent in the low temperature fluidity | liquidity and shear stability, and was excellent in the abrasion resistance and fatigue life which can be made fuel-saving is provided. Therefore, when applied to a hybrid vehicle or electric vehicle reducer, in particular, an electric motor or an in-wheel motor, it is possible to achieve fuel saving while maintaining necessary characteristics as a reducer oil. Among them, it is suitable for an electric vehicle having no auxiliary power source.
以下、本発明の好適な実施形態について説明する。 Hereinafter, preferred embodiments of the present invention will be described.
本実施形態に係るハイブリッド車又は電気自動車の減速機用潤滑油組成物は、(A)合成系基油を含み、25℃でのトラクション係数が0.007以下である潤滑油基油と、(B)重量平均分子量が40000〜100000の流動点降下剤と、を含有し、潤滑油組成物全量基準で、流動点降下剤の含有量が0.1〜1.0質量%であり、下記式(1)を満たす。
0.01≦[CS/(CB×CP)]≦0.025 (1)
[式中、CSは潤滑油組成物中の硫黄含有量を示し、CBは潤滑油組成物中のホウ素含有量を示し、CPは潤滑油組成物中のリン含有量を示し、CS、CB及びCPはいずれも潤滑油組成物全量基準での含有量(質量)である。]
The lubricating oil composition for a speed reducer of a hybrid vehicle or an electric vehicle according to the present embodiment includes (A) a lubricating base oil containing a synthetic base oil and having a traction coefficient at 25 ° C. of 0.007 or less; B) a pour point depressant having a weight average molecular weight of 40,000 to 100,000, and based on the total amount of the lubricating oil composition, the content of the pour point depressant is 0.1 to 1.0% by mass. Satisfy (1).
0.01 ≦ [C S / (C B × C P )] ≦ 0.025 (1)
[Wherein C S represents the sulfur content in the lubricating oil composition, C B represents the boron content in the lubricating oil composition, C P represents the phosphorus content in the lubricating oil composition, and C S, is a content at C B and C P are both lubricating oil composition the total amount (mass). ]
[(A)成分:潤滑油基油]
本実施形態に係る潤滑油組成物は、(A)合成系基油を含み、25℃でのトラクション係数が0.007以下である潤滑油基油を含有する。
[(A) component: lubricating base oil]
The lubricating oil composition according to the present embodiment contains (A) a synthetic base oil and a lubricating base oil having a traction coefficient at 25 ° C. of 0.007 or less.
合成系基油としては、ポリα−オレフィン又はその水素化物、イソブテンオリゴマー又はその水素化物、イソパラフィン、アルキルベンゼン、アルキルナフタレン、一塩基酸エステル、二塩基酸エステル等のエステル系基油、ポリオキシアルキレングリコール、ジアルキルジフェニルエーテル、ポリフェニルエーテル、フィッシャートロピッシュプロセスから製造されたワックスを接触脱ろうして製造された基油などが挙げられる。なお、これらの基油は単独でも、2種以上任意の割合で組み合わせて使用してもよい。 Synthetic base oils include poly α-olefins or their hydrides, isobutene oligomers or their hydrides, isoparaffins, alkylbenzenes, alkylnaphthalenes, monobasic acid esters, dibasic acid esters, and other ester base oils, polyoxyalkylene glycols , Dialkyl diphenyl ethers, polyphenyl ethers, base oils produced by catalytic dewaxing of waxes produced from the Fischer-Tropsch process, and the like. These base oils may be used alone or in combination of two or more at any ratio.
合成系基油の含有量は、特に限定されないが、潤滑油基油全量基準で、好ましくは30質量%以上であり、より好ましくは40質量%以上であり、さらに好ましくは50質量%以上である。また、合成系基油の含有量は、潤滑油基油全量基準で、100質量%であってもよい。その含有量を30質量%以上とすることにより、低温流動性及び疲労寿命に優れる潤滑油組成物を得ることが可能となる。 The content of the synthetic base oil is not particularly limited, but is preferably 30% by mass or more, more preferably 40% by mass or more, and further preferably 50% by mass or more, based on the total amount of the lubricating base oil. . Further, the content of the synthetic base oil may be 100% by mass based on the total amount of the lubricating base oil. By setting the content to 30% by mass or more, it becomes possible to obtain a lubricating oil composition having excellent low-temperature fluidity and fatigue life.
合成系基油は、ポリα−オレフィンを含むことが好ましい。ポリα−オレフィンとしては、具体的には、炭素数2〜32、好ましくは6〜16のα−オレフィンのオリゴマー又はコオリゴマー(例えば、1−オクテンオリゴマー、1−デセンオリゴマー、1−ドデセンオリゴマー、エチレン−プロピレンコオリゴマー等)及びその水素化物が挙げられる。 The synthetic base oil preferably contains a poly α-olefin. Specific examples of the poly-α-olefin include oligomers or co-oligomers having 2 to 32 carbon atoms, preferably 6 to 16 carbon atoms (for example, 1-octene oligomer, 1-decene oligomer, 1-dodecene oligomer). , Ethylene-propylene co-oligomer and the like) and hydrides thereof.
ポリα−オレフィンの製法については特に制限はないが、例えば、三塩化アルミニウム、三フッ化ホウ素、又は三フッ化ホウ素と水、アルコール(例えば、エタノール、プロパノール又はブタノール)、カルボン酸、又はエステル(例えば、酢酸エチル又はプロピオン酸エチル)との錯体を含むフリーデル・クラフツ触媒のような重合触媒の存在下でのα−オレフィンの重合等が挙げられる。 Although there is no restriction | limiting in particular about the manufacturing method of poly alpha olefin, For example, aluminum trichloride, boron trifluoride, or boron trifluoride and water, alcohol (for example, ethanol, propanol, or butanol), carboxylic acid, or ester ( For example, polymerization of α-olefin in the presence of a polymerization catalyst such as a Friedel-Crafts catalyst containing a complex with ethyl acetate or ethyl propionate) may be mentioned.
ポリα−オレフィンを含有させる場合の含有量は、潤滑油基油全量基準で、好ましくは60質量%以上であり、より好ましくは65質量%以上であり、さらに好ましくは70質量%以上である。また、ポリα−オレフィンの含有量は、潤滑油基油全量基準で、100質量%であってもよい。その含有量を60質量%以上とすることにより、低温流動性及び疲労寿命により優れる潤滑油組成物を得ることが可能となる。 The content in the case of containing the poly α-olefin is preferably 60% by mass or more, more preferably 65% by mass or more, and further preferably 70% by mass or more, based on the total amount of the lubricating base oil. Further, the content of the poly α-olefin may be 100% by mass based on the total amount of the lubricating base oil. By setting the content to 60% by mass or more, it becomes possible to obtain a lubricating oil composition that is superior in low-temperature fluidity and fatigue life.
ポリα−オレフィンの40℃における動粘度は、特に制限はされないが、好ましくは5mm2/s以上であり、より好ましくは10mm2/s以上であり、さらに好ましくは15mm2/s以上である。また、好ましくは50mm2/s以下であり、より好ましくは40mm2/s以下であり、さらに好ましくは35mm2/s以下である。40℃における動粘度が5mm2/s以上、又は50mm2/s以下であると、極圧性、耐摩耗性及び耐焼付き性に優れる傾向にある。 The kinematic viscosity at 40 ° C. of the poly α-olefin is not particularly limited, but is preferably 5 mm 2 / s or more, more preferably 10 mm 2 / s or more, and further preferably 15 mm 2 / s or more. Moreover, Preferably it is 50 mm < 2 > / s or less, More preferably, it is 40 mm < 2 > / s or less, More preferably, it is 35 mm < 2 > / s or less. When the kinematic viscosity at 40 ° C. is 5 mm 2 / s or more, or 50 mm 2 / s or less, extreme pressure properties, wear resistance, and seizure resistance tend to be excellent.
ポリα−オレフィンの粘度指数は、特に制限はされないが、好ましくは100以上であり、より好ましくは110以上であり、さらに好ましくは120以上である。粘度指数が100以上であると、低温流動性に優れる傾向にある。 The viscosity index of the poly α-olefin is not particularly limited, but is preferably 100 or more, more preferably 110 or more, and further preferably 120 or more. When the viscosity index is 100 or more, the low temperature fluidity tends to be excellent.
合成系基油は、ポリα−オレフィンに加え、さらにエステル系基油を含むことが好ましい。 The synthetic base oil preferably contains an ester base oil in addition to the poly α-olefin.
エステル系基油を構成するアルコールとしては1価アルコールでも多価アルコール(ポリオール)でもよく、また、エステル系基油を構成する酸としては一塩基酸でも多塩基酸であってもよい。また、エステル結合を含有する基油であれば、複合エステル化合物であってもよい。 The alcohol constituting the ester base oil may be a monohydric alcohol or a polyhydric alcohol (polyol), and the acid constituting the ester base oil may be a monobasic acid or a polybasic acid. Moreover, if it is a base oil containing an ester bond, a complex ester compound may be used.
1価アルコールとしては、通常炭素数1〜24、好ましくは1〜12、より好ましくは1〜8のものが用いられ、このようなアルコールとしては直鎖のものでも分枝のものでもよく、また飽和のものであっても不飽和のものであってもよい。炭素数1〜24のアルコールとしては、具体的には例えば、メタノール、エタノール、直鎖状又は分枝状のプロパノール、直鎖状又は分枝状のブタノール、直鎖状又は分枝状のペンタノール、直鎖状又は分枝状のヘキサノール、直鎖状又は分枝状のヘプタノール、直鎖状又は分枝状のオクタノール、直鎖状又は分枝状のノナノール、直鎖状又は分枝状のデカノール、直鎖状又は分枝状のウンデカノール、直鎖状又は分枝状のドデカノール、直鎖状又は分枝状のトリデカノール、直鎖状又は分枝状のテトラデカノール、直鎖状又は分枝状のペンタデカノール、直鎖状又は分枝状のヘキサデカノール、直鎖状又は分枝状のヘプタデカノール、直鎖状又は分枝状のオクタデカノール、直鎖状又は分枝状のノナデカノール、直鎖状又は分枝状のイコサノール、直鎖状又は分枝状のヘンイコサノール、直鎖状又は分枝状のトリコサノール、直鎖状又は分枝状のテトラコサノール及びこれらの混合物等が挙げられる。 As the monohydric alcohol, those having 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, more preferably 1 to 8 carbon atoms are usually used. Such alcohols may be linear or branched, It may be saturated or unsaturated. Specific examples of the alcohol having 1 to 24 carbon atoms include methanol, ethanol, linear or branched propanol, linear or branched butanol, and linear or branched pentanol. , Linear or branched hexanol, linear or branched heptanol, linear or branched octanol, linear or branched nonanol, linear or branched decanol , Linear or branched undecanol, linear or branched dodecanol, linear or branched tridecanol, linear or branched tetradecanol, linear or branched Pentadecanol, linear or branched hexadecanol, linear or branched heptadecanol, linear or branched octadecanol, linear or branched nonadecanol , Linear or branched icosa Lumpur, linear or branched Hen'ikosanoru, linear or branched Torikosanoru, such as straight-chain or branched tetracosanol, and mixtures thereof.
多価アルコール(ポリオール)としては、通常2〜10価、好ましくは2〜6価のものが用いられる。2〜10価の多価アルコールとしては、具体的には例えば、エチレングリコール、ジエチレングリコール、ポリエチレングリコール(エチレングリコールの3〜15量体)、プロピレングリコール、ジプロピレングリコール、ポリプロピレングリコール(プロピレングリコールの3〜15量体)、1,3−プロパンジオール、1,2−プロパンジオール、1,3−ブタンジオール、1,4−ブタンジオール、2−メチル−1,2−プロパンジオール、2−メチル−1,3−プロパンジオール、1,2−ペンタンジオール、1,3−ペンタンジオール、1,4−ペンタンジオール、1,5−ペンタンジオール、ネオペンチルグリコール等の2価アルコール;グリセリン、ポリグリセリン(グリセリンの2〜8量体、例えばジグリセリン、トリグリセリン、テトラグリセリン等)、トリメチロールアルカン(トリメチロールエタン、トリメチロールプロパン、トリメチロールブタン等)及びこれらの2〜8量体、ペンタエリスリトール及びこれらの2〜4量体、1,2,4−ブタントリオール、1,3,5−ペンタントリオール、1,2,6−ヘキサントリオール、1,2,3,4−ブタンテトロール、ソルビトール、ソルビタン、ソルビトールグリセリン縮合物、アドニトール、アラビトール、キシリトール、マンニトール等の多価アルコール;キシロース、アラビノース、リボース、ラムノース、グルコース、フルクトース、ガラクトース、マンノース、ソルボース、セロビオース、マルトース、イソマルトース、トレハロース、スクロース等の糖類、及びこれらの混合物などが挙げられる。 As the polyhydric alcohol (polyol), those having 2 to 10 valences, preferably 2 to 6 valences are usually used. Specific examples of the divalent to 10-valent polyhydric alcohol include, for example, ethylene glycol, diethylene glycol, polyethylene glycol (3 to 15 mer of ethylene glycol), propylene glycol, dipropylene glycol, and polypropylene glycol (3 to 3 of propylene glycol). 15-mer), 1,3-propanediol, 1,2-propanediol, 1,3-butanediol, 1,4-butanediol, 2-methyl-1,2-propanediol, 2-methyl-1, Dihydric alcohols such as 3-propanediol, 1,2-pentanediol, 1,3-pentanediol, 1,4-pentanediol, 1,5-pentanediol, neopentylglycol; glycerin, polyglycerin (glycerin 2 ~ Octamer, eg diglycerin, trig Serine, tetraglycerin, etc.), trimethylol alkanes (trimethylol ethane, trimethylol propane, trimethylol butane, etc.) and their 2- to 8-mer, pentaerythritol and their 2- to 4-mer, 1,2,4- Butanetriol, 1,3,5-pentanetriol, 1,2,6-hexanetriol, 1,2,3,4-butanetetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol, xylitol, mannitol, etc. Polysaccharides such as xylose, arabinose, ribose, rhamnose, glucose, fructose, galactose, mannose, sorbose, cellobiose, maltose, isomaltose, trehalose, sucrose, and the like, and mixtures thereof. It is.
一塩基酸としては、通常炭素数2〜24の脂肪酸が用いられ、その脂肪酸は直鎖のものでも分枝のものでもよく、また飽和のものでも不飽和のものでもよい。具体的には、例えば、酢酸、プロピオン酸、直鎖状又は分枝状のブタン酸、直鎖状又は分枝状のペンタン酸、直鎖状又は分枝状のヘキサン酸、直鎖状又は分枝状のヘプタン酸、直鎖状又は分枝状のオクタン酸、直鎖状又は分枝状のノナン酸、直鎖状又は分枝状のデカン酸、直鎖状又は分枝状のウンデカン酸、直鎖状又は分枝状のドデカン酸、直鎖状又は分枝状のトリデカン酸、直鎖状又は分枝状のテトラデカン酸、直鎖状又は分枝状のペンタデカン酸、直鎖状又は分枝状のヘキサデカン酸、直鎖状又は分枝状のヘプタデカン酸、直鎖状又は分枝状のオクタデカン酸、直鎖状又は分枝状のノナデカン酸、直鎖状又は分枝状のイコサン酸、直鎖状又は分枝状のヘンイコサン酸、直鎖状又は分枝状のドコサン酸、直鎖状又は分枝状のトリコサン酸、直鎖状又は分枝状のテトラコサン酸等の飽和脂肪酸、アクリル酸、直鎖状又は分枝状のブテン酸、直鎖状又は分枝状のペンテン酸、直鎖状又は分枝状のヘキセン酸、直鎖状又は分枝状のヘプテン酸、直鎖状又は分枝状のオクテン酸、直鎖状又は分枝状のノネン酸、直鎖状又は分枝状のデセン酸、直鎖状又は分枝状のウンデセン酸、直鎖状又は分枝状のドデセン酸、直鎖状又は分枝状のトリデセン酸、直鎖状又は分枝状のテトラデセン酸、直鎖状又は分枝状のペンタデセン酸、直鎖状又は分枝状のヘキサデセン酸、直鎖状又は分枝状のヘプタデセン酸、直鎖状又は分枝状のオクタデセン酸、直鎖状又は分枝状のノナデセン酸、直鎖状又は分枝状のイコセン酸、直鎖状又は分枝状のヘンイコセン酸、直鎖状又は分枝状のドコセン酸、直鎖状又は分枝状のトリコセン酸、直鎖状又は分枝状のテトラコセン酸等の不飽和脂肪酸、及びこれらの混合物などが挙げられる。 As the monobasic acid, a fatty acid having 2 to 24 carbon atoms is usually used, and the fatty acid may be linear or branched, and may be saturated or unsaturated. Specifically, for example, acetic acid, propionic acid, linear or branched butanoic acid, linear or branched pentanoic acid, linear or branched hexanoic acid, linear or branched Branched heptanoic acid, linear or branched octanoic acid, linear or branched nonanoic acid, linear or branched decanoic acid, linear or branched undecanoic acid, Linear or branched dodecanoic acid, linear or branched tridecanoic acid, linear or branched tetradecanoic acid, linear or branched pentadecanoic acid, linear or branched Hexadecanoic acid, linear or branched heptadecanoic acid, linear or branched octadecanoic acid, linear or branched nonadecanoic acid, linear or branched icosanoic acid, direct Linear or branched heicosanoic acid, linear or branched docosanoic acid, linear or branched tricosanoic acid, Saturated fatty acids such as linear or branched tetracosanoic acid, acrylic acid, linear or branched butenoic acid, linear or branched pentenoic acid, linear or branched hexenoic acid, Linear or branched heptenoic acid, linear or branched octenoic acid, linear or branched nonenic acid, linear or branched decenoic acid, linear or branched Undecenoic acid, linear or branched dodecenoic acid, linear or branched tridecenoic acid, linear or branched tetradecenoic acid, linear or branched pentadecenoic acid, straight Linear or branched hexadecenoic acid, linear or branched heptadecenoic acid, linear or branched octadecenoic acid, linear or branched nonadecenoic acid, linear or branched Icosenoic acid, linear or branched henicosenoic acid, linear or branched docosenoic acid, linear or branched Jo of tricosenoic acid, unsaturated fatty acids such as straight-chain or branched tetracosenoic acid, and mixtures thereof.
多塩基酸としては炭素数2〜16の二塩基酸及びトリメリット酸等が挙げられる。炭素数2〜16の二塩基酸としては、直鎖のものでも分枝のものでもよく、また飽和のものでも不飽和のものでもよい。具体的には例えば、エタン二酸、プロパン二酸、直鎖状又は分枝状のブタン二酸、直鎖状又は分枝状のペンタン二酸、直鎖状又は分枝状のヘキサン二酸、直鎖状又は分枝状のヘプタン二酸、直鎖状又は分枝状のオクタン二酸、直鎖状又は分枝状のノナン二酸、直鎖状又は分枝状のデカン二酸、直鎖状又は分枝状のウンデカン二酸、直鎖状又は分枝状のドデカン二酸、直鎖状又は分枝状のトリデカン二酸、直鎖状又は分枝状のテトラデカン二酸、直鎖状又は分枝状のヘプタデカン二酸、直鎖状又は分枝状のヘキサデカン二酸、直鎖状又は分枝状のヘキセン二酸、直鎖状又は分枝状のヘプテン二酸、直鎖状又は分枝状のオクテン二酸、直鎖状又は分枝状のノネン二酸、直鎖状又は分枝状のデセン二酸、直鎖状又は分枝状のウンデセン二酸、直鎖状又は分枝状のドデセン二酸、直鎖状又は分枝状のトリデセン二酸、直鎖状又は分枝状のテトラデセン二酸、直鎖状又は分枝状のヘプタデセン二酸、直鎖状又は分枝状のヘキサデセン二酸及びこれらの混合物などが挙げられる。 Examples of the polybasic acid include dibasic acids having 2 to 16 carbon atoms and trimellitic acid. The dibasic acid having 2 to 16 carbon atoms may be linear or branched, and may be saturated or unsaturated. Specifically, for example, ethanedioic acid, propanedioic acid, linear or branched butanedioic acid, linear or branched pentanedioic acid, linear or branched hexanedioic acid, Linear or branched heptanedioic acid, linear or branched octanedioic acid, linear or branched nonanedioic acid, linear or branched decanedioic acid, linear Linear or branched undecanedioic acid, linear or branched dodecanedioic acid, linear or branched tridecanedioic acid, linear or branched tetradecanedioic acid, linear or Branched heptadecanedioic acid, linear or branched hexadecanedioic acid, linear or branched hexenedioic acid, linear or branched heptenedioic acid, linear or branched Octene diacid, linear or branched nonene diacid, linear or branched decenedioic acid, linear or branched undecenedioic acid, linear Is branched dodecenedioic acid, linear or branched tridecenedioic acid, linear or branched tetradecenedioic acid, linear or branched heptacenedioic acid, linear or branched Examples thereof include branched hexadecenedioic acid and a mixture thereof.
エステルを形成するアルコールと酸との組み合わせは任意であって特に制限されないが、本実施形態で使用可能なエステルとしては、例えば下記のエステルを挙げることができ、これらのエステルは単独でもよく、また2種以上を組み合わせてもよい。
(a)1価アルコールと一塩基酸とのエステル
(b)多価アルコールと一塩基酸とのエステル
(c)1価アルコールと多塩基酸とのエステル
(d)多価アルコールと多塩基酸とのエステル
(e)1価アルコール、多価アルコールとの混合物と多塩基酸との混合エステル
(f)多価アルコールと一塩基酸、多塩基酸との混合物との混合エステル
(g)1価アルコール、多価アルコールとの混合物と一塩基酸、多塩基酸との混合エステル
The combination of the alcohol and the acid forming the ester is arbitrary and is not particularly limited. Examples of the ester that can be used in this embodiment include the following esters, and these esters may be used alone, Two or more kinds may be combined.
(A) ester of monohydric alcohol and monobasic acid (b) ester of polyhydric alcohol and monobasic acid (c) ester of monohydric alcohol and polybasic acid (d) polyhydric alcohol and polybasic acid (E) Mixed ester of monohydric alcohol, mixture of polyhydric alcohol and polybasic acid (f) Mixed ester of polyhydric alcohol with monobasic acid, polybasic acid (g) Monohydric alcohol , Mixtures of polyhydric alcohols with monobasic acids and polybasic acids
これらの中でも、耐摩擦性及び酸化安定性に優れることから、(a)一価アルコールと一塩基酸とのエステルである一塩基酸エステルであることが好ましい。 Among these, since it is excellent in friction resistance and oxidation stability, it is preferable that it is (a) monobasic acid ester which is ester of monohydric alcohol and monobasic acid.
エステル系基油を含有させる場合の含有量は、潤滑油基油全量基準で、好ましくは1質量%以上であり、より好ましくは5質量%以上であり、さらに好ましくは10質量%以上である。また、好ましくは40質量%以下であり、より好ましくは35質量%以下であり、さらに好ましくは30質量%以下である。エステル系基油の含有量が1質量%以上、又は40質量%以下であると、低温流動性がより優れる傾向にある。 When the ester base oil is contained, the content is preferably 1% by mass or more, more preferably 5% by mass or more, and further preferably 10% by mass or more, based on the total amount of the lubricating base oil. Moreover, it is preferably 40% by mass or less, more preferably 35% by mass or less, and further preferably 30% by mass or less. When the content of the ester base oil is 1% by mass or more or 40% by mass or less, the low temperature fluidity tends to be more excellent.
エステル系基油の40℃における動粘度は、特に制限はされないが、好ましくは5mm2/s以上であり、より好ましくは6mm2/s以上であり、さらに好ましくは7mm2/s以上である。また、好ましくは50mm2/s以下であり、より好ましくは30mm2/s以下であり、さらに好ましくは20mm2/s以下である。40℃における動粘度が5mm2/s以上、又は50mm2/s以下であると、極圧性、耐摩耗性及び耐焼付き性に優れる傾向にある。 The kinematic viscosity at 40 ° C. of the ester base oil is not particularly limited, but is preferably 5 mm 2 / s or more, more preferably 6 mm 2 / s or more, and further preferably 7 mm 2 / s or more. Moreover, Preferably it is 50 mm < 2 > / s or less, More preferably, it is 30 mm < 2 > / s or less, More preferably, it is 20 mm < 2 > / s or less. When the kinematic viscosity at 40 ° C. is 5 mm 2 / s or more, or 50 mm 2 / s or less, extreme pressure properties, wear resistance, and seizure resistance tend to be excellent.
エステル系基油の粘度指数は、特に制限はされないが、好ましくは125以上であり、より好ましくは130以上であり、さらに好ましくは135以上である。粘度指数が125以上であると、低温流動性に優れる傾向にある。 The viscosity index of the ester base oil is not particularly limited, but is preferably 125 or more, more preferably 130 or more, and still more preferably 135 or more. When the viscosity index is 125 or more, the low temperature fluidity tends to be excellent.
エステル系基油の流動点は、特に制限はされないが、好ましくは−20℃以下であり、より好ましくは−30℃以下であり、さらに好ましくは−40℃以下である。 The pour point of the ester base oil is not particularly limited, but is preferably −20 ° C. or lower, more preferably −30 ° C. or lower, and further preferably −40 ° C. or lower.
エステル系基油の引火点は、特に制限はされないが、好ましくは200℃以上であり、より好ましくは210℃以上であり、さらに好ましくは220℃以上である。 The flash point of the ester base oil is not particularly limited, but is preferably 200 ° C. or higher, more preferably 210 ° C. or higher, and further preferably 220 ° C. or higher.
本実施形態に係る潤滑油基油は、合成系基油以外の基油成分を含むことができる。合成系基油以外の基油成分は、特に制限されず、通常の潤滑油に使用される基油を使用できる。具体的には、鉱油系基油又はこの中から選ばれる2種以上の基油を任意の割合で混合した混合物等を使用できる。 The lubricating base oil according to this embodiment can contain a base oil component other than the synthetic base oil. Base oil components other than the synthetic base oil are not particularly limited, and base oils used for ordinary lubricating oils can be used. Specifically, a mineral oil base oil or a mixture obtained by mixing two or more base oils selected from these at an arbitrary ratio can be used.
鉱油系基油としては、原油を常圧蒸留及び減圧蒸留して得られた潤滑油留分を、溶剤脱れき、溶剤抽出、水素化分解、溶剤脱ろう、接触脱ろう、水素化精製、硫酸洗浄、白土処理等の精製処理を単独又は二つ以上適宜組み合わせて精製したパラフィン系、ナフテン系等の鉱油系基油、ノルマルパラフィン、イソパラフィン、石油系ワックスを接触脱ろうして製造された基油等が挙げられる。なお、これらの基油は単独でも、2種以上任意の割合で組み合わせて使用してもよい。 As mineral base oils, lubricating oil fractions obtained by subjecting crude oil to atmospheric distillation and reduced pressure distillation are subjected to solvent deburring, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid Mineral oil base oils such as paraffinic and naphthenic oils refined by combining purification treatments such as washing and clay treatment alone or in combination of two or more, base oils produced by catalytic dewaxing of normal paraffins, isoparaffins, petroleum waxes, etc. Is mentioned. These base oils may be used alone or in combination of two or more at any ratio.
鉱油系基油としては、低粘度化の観点、及び硫黄含有量の観点から、API(American Petroleum Institute)のBase Stock Categoriesに規定されているグループII又はグループIIIに分類される基油であることが好ましく、グループIIIに分類される基油がより好ましい。 Mineral oil base oil is a base oil classified into Group II or Group III defined in the Base Stock Categories of API (American Petroleum Institute) from the viewpoint of viscosity reduction and sulfur content Are preferred, and base oils classified in Group III are more preferred.
鉱油系基油の硫黄含有量は、特に制限はないが、潤滑油基油全量基準で、100質量ppm以下、50質量ppm以下又は10質量ppm以下であってよい。鉱油系基油の硫黄含有量は、例えば、ICP元素分析法等によって求めることができる。 The sulfur content of the mineral oil base oil is not particularly limited, but may be 100 ppm by mass, 50 ppm by mass or 10 ppm by mass based on the total amount of the lubricant base oil. The sulfur content of the mineral base oil can be determined by, for example, ICP elemental analysis.
(A)成分の潤滑油基油の25℃でのトラクション係数は、0.007以下であり、好ましくは0.0065以下であり、より好ましくは0.006以下であり、さらに好ましくは0.0055以下である。25℃でのトラクション係数を0.007以下とすることにより、低温流動性、せん断安定性及び疲労寿命に優れる潤滑油組成物を得ることが可能となる。なお、ここで25℃でのトラクション係数は、EHL試験機を用い、油温25℃、面圧0.44GPa、すべり率3%、周速0.5m/sの条件で測定した値をいう。 The traction coefficient at 25 ° C. of the lubricating base oil of component (A) is 0.007 or less, preferably 0.0065 or less, more preferably 0.006 or less, and still more preferably 0.0055. It is as follows. By setting the traction coefficient at 25 ° C. to 0.007 or less, it is possible to obtain a lubricating oil composition having excellent low-temperature fluidity, shear stability, and fatigue life. Here, the traction coefficient at 25 ° C. is a value measured using an EHL tester under conditions of an oil temperature of 25 ° C., a surface pressure of 0.44 GPa, a slip ratio of 3%, and a peripheral speed of 0.5 m / s.
[(B)成分:流動点降下剤]
本実施形態に係る潤滑油組成物は、潤滑油組成物全量基準で、0.1〜1.0質量%の重量平均分子量が40000〜100000の流動点降下剤を含有する。このような流動点降下剤を(A)成分と組み合わせることにより、低トラクション化及び油膜厚さ向上により、低温流動性を高め、疲労寿命を長くすることができる。
[(B) component: pour point depressant]
The lubricating oil composition according to this embodiment contains a pour point depressant having a weight average molecular weight of 0.1 to 1.0 mass% and 40000 to 100,000 based on the total amount of the lubricating oil composition. By combining such a pour point depressant with the component (A), it is possible to increase low temperature fluidity and prolong fatigue life by reducing traction and improving oil film thickness.
流動点降下剤は、重量平均分子量が40000〜100000であれば、特に構造及び種類は限定されないが、充分な低温流動性が得られることから、ポリ(メタ)アクリレート系流動点降下剤であることが好ましい。 The pour point depressant is not particularly limited as long as the weight average molecular weight is 40,000 to 100,000, but it is a poly (meth) acrylate pour point depressant because sufficient low temperature fluidity can be obtained. Is preferred.
流動点降下剤の重量平均分子量は、40000〜100000であり、上限値は好ましくは80000以下であり、より好ましくは60000以下であり、さらに好ましくは50000以下である。流動点降下剤の重量平均分子量を40000〜100000とすることにより、充分な低温流動性及び疲労寿命を有する潤滑油組成物を得ることができる。なお、ここでいう重量平均分子量とは、ウォーターズ社製150−C ALC/GPC装置において東ソー社製のGMHHR−M(7.8mmID×30cm)のカラムを2本直列に使用し、溶媒としてテトラヒドロフランを用い、温度23℃、流速1mL/分、試料濃度1質量%、試料注入量75μLの条件下、示差屈折率計(RI)検出器を用いて測定した標準ポリスチレン換算の重量平均分子量である。 The pour point depressant has a weight average molecular weight of 40,000 to 100,000, and an upper limit of preferably 80,000 or less, more preferably 60000 or less, and even more preferably 50000 or less. By setting the weight average molecular weight of the pour point depressant to 40,000 to 100,000, a lubricating oil composition having sufficient low temperature fluidity and fatigue life can be obtained. Here, the weight average molecular weight means that two columns of GHSHR-M (7.8 mm ID × 30 cm) manufactured by Tosoh Corporation are used in series in a 150-C ALC / GPC apparatus manufactured by Waters, and tetrahydrofuran is used as a solvent. It is a weight average molecular weight in terms of standard polystyrene measured using a differential refractometer (RI) detector under conditions of a temperature of 23 ° C., a flow rate of 1 mL / min, a sample concentration of 1 mass%, and a sample injection amount of 75 μL.
流動点降下剤の含有量は、潤滑油組成物全量基準で、0.1〜1.0質量%であり、下限値は好ましくは0.2質量%以上である。流動点降下剤の含有量を0.1質量%以上とすることによって、疲労寿命に優れる傾向にある。流動点降下剤の含有量を1.0質量%以下とすることによって、せん断安定性に優れる傾向にある。 The content of the pour point depressant is 0.1 to 1.0% by mass based on the total amount of the lubricating oil composition, and the lower limit is preferably 0.2% by mass or more. When the content of the pour point depressant is 0.1% by mass or more, the fatigue life tends to be excellent. When the content of the pour point depressant is 1.0% by mass or less, the shear stability tends to be excellent.
本実施形態に係る潤滑油組成物は、さらに粘度調整剤を含有することが好ましい。 The lubricating oil composition according to this embodiment preferably further contains a viscosity modifier.
粘度調整剤は、具体的には非分散型又は分散型エステル基含有粘度調整剤であり、例えば、非分散型又は分散型ポリ(メタ)アクリレート系粘度調整剤、非分散型又は分散型オレフィン−(メタ)アクリレート共重合体系粘度調整剤、スチレン−無水マレイン酸エステル共重合体系粘度調整剤及びこれらの混合物、α−オレフィンと重合性不飽和結合を有するエステル単量体との共重合体、非分散型若しくは分散型エチレン−α−オレフィン共重合体又はその水素化物、ポリイソブチレン又はその水素化物、スチレン−ジエン水素化共重合体、ポリアルキルスチレン等を挙げることができる。 The viscosity modifier is specifically a non-dispersed or dispersed ester group-containing viscosity modifier, such as a non-dispersed or dispersed poly (meth) acrylate viscosity modifier, a non-dispersed or dispersed olefin- (Meth) acrylate copolymer viscosity modifiers, styrene-maleic anhydride copolymer viscosity modifiers and mixtures thereof, copolymers of α-olefins and ester monomers having a polymerizable unsaturated bond, Examples thereof include a dispersed or dispersed ethylene-α-olefin copolymer or a hydride thereof, polyisobutylene or a hydride thereof, a styrene-diene hydrogenated copolymer, and a polyalkylstyrene.
粘度調整剤は、これらの中でも非分散型又は分散型ポリ(メタ)アクリレート系粘度調整剤であることが好ましい。特に非分散型又は分散型ポリメタクリレート系粘度調整剤であることが好ましい。 Among these, the viscosity modifier is preferably a non-dispersed or dispersed poly (meth) acrylate viscosity modifier. In particular, non-dispersed or dispersed polymethacrylate viscosity modifiers are preferred.
本実施形態に係るポリメタクリレート系粘度調整剤は、下記一般式(1)で表される構造単位を有するポリメタクリレート系粘度調整剤である。
一般式(1)において、R1は水素又はメチル基、好ましくはメチル基を示し、R2は炭素数18〜30の直鎖又は分枝状の炭化水素基、好ましくは炭素数20以上の分枝状炭化水素基を示す。 In the general formula (1), R 1 represents hydrogen or a methyl group, preferably a methyl group, and R 2 represents a linear or branched hydrocarbon group having 18 to 30 carbon atoms, preferably a group having 20 or more carbon atoms. A branched hydrocarbon group is shown.
ここで、炭素数18〜30の直鎖又は分枝状の炭化水素基としては、ヘキサデシル基、ヘプタデシル基、オクタデシル基、ノナデシル基、イコシル基、ヘンイコシル基、ドコシル基、トリコシル基、テトラコシル基、ペンタコシル基、ヘキサコシル基、ヘプタコシル基、オクタコシル基、ノナコシル基、トリアコンチル基等のアルキル基(これらアルキル基は直鎖状でも分枝状でもよい);ヘキサデセニル基、ヘプタデセニル基、オクタデセニル基、ノナデセニル基、イコセニル基、ヘンイコセニル基、ドコセニル基、トリコセニル基、テトラコセニル基、ペンタコセニル基、ヘキサコセニル基、ヘプタコセニル基、オクタコセニル基、ノナコセニル基、トリアコンテニル基等のアルケニル基(これらアルケニル基は直鎖状でも分枝状でもよく、また二重結合の位置も任意である)等が例示できる。 Here, as a linear or branched hydrocarbon group having 18 to 30 carbon atoms, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, henicosyl group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group Group, hexacosyl group, heptacosyl group, octacosyl group, nonacosyl group, triacontyl group, etc. (these alkyl groups may be linear or branched); hexadecenyl group, heptadecenyl group, octadecenyl group, nonadecenyl group, icocenyl group Alkenyl groups such as henicosenyl group, dococenyl group, tricocenyl group, tetracocenyl group, pentacocenyl group, hexacocenyl group, heptacocenyl group, octacocenyl group, nonacosenyl group and triaconenyl group (these alkenyl groups may be linear or branched) , The position of the double bond is also arbitrary) and the like.
ポリメタクリレート系粘度調整剤における、一般式(1)で表される構造単位の構成比は、好ましくは5モル%以上であり、より好ましくは15モル%以上であり、さらに好ましくは30モル%以上である。また、低温流動性の観点から、好ましくは80モル%以下であり、より好ましくは60モル%以下であり、さらに好ましくは50モル%以下である。 The composition ratio of the structural unit represented by the general formula (1) in the polymethacrylate viscosity modifier is preferably 5 mol% or more, more preferably 15 mol% or more, and further preferably 30 mol% or more. It is. Moreover, from a viewpoint of low-temperature fluidity | liquidity, Preferably it is 80 mol% or less, More preferably, it is 60 mol% or less, More preferably, it is 50 mol% or less.
ポリメタクリレート系粘度調整剤の重量平均分子量は、特に制限されないが、好ましくは5000以上であり、より好ましくは7000以上であり、さらに好ましくは10000以上であり、特に好ましくは15000以上である。また、好ましくは30000以下であり、より好ましくは28000以下であり、さらに好ましくは26000以下であり、特に好ましくは24000以下である。なお、ここでいう重量平均分子量は、ウォーターズ社製150−C ALC/GPC装置に東ソー社製のGMHHR−M(7.8mmID×30cm)のカラムを2本直列に使用し、溶媒としてはテトラヒドロフラン、温度23℃、流速1mL/分、試料濃度1質量%、試料注入量75μL、検出器示差屈折率計(RI)で測定したポリスチレン換算の重量平均分子量を意味する。 The weight average molecular weight of the polymethacrylate viscosity modifier is not particularly limited, but is preferably 5000 or more, more preferably 7000 or more, further preferably 10,000 or more, and particularly preferably 15000 or more. Moreover, it is preferably 30000 or less, more preferably 28000 or less, further preferably 26000 or less, and particularly preferably 24000 or less. In addition, the weight average molecular weight mentioned here uses two columns of Tosoh's GMHHR-M (7.8 mm ID × 30 cm) in series on a Waters 150-C ALC / GPC apparatus, and the solvent is tetrahydrofuran, It means a weight average molecular weight in terms of polystyrene measured by a temperature of 23 ° C., a flow rate of 1 mL / min, a sample concentration of 1 mass%, a sample injection amount of 75 μL, and a detector differential refractometer (RI).
ポリメタクリレート系粘度調整剤を含有させる場合の含有量は、潤滑油組成物全量基準で、好ましくは0.1質量%以上であり、より好ましくは0.3質量%以上であり、さらに好ましくは0.5質量%以上である。また、好ましくは10質量%以下であり、より好ましくは7質量%以下であり、さらに好ましくは5質量%以下である。その含有量を10質量%以下とすることによって、含有量に見合う疲労寿命向上効果が期待でき、さらにせん断安定性により優れる傾向にある。 The content of the polymethacrylate viscosity modifier is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, and still more preferably 0, based on the total amount of the lubricating oil composition. .5% by mass or more. Moreover, it is preferably 10% by mass or less, more preferably 7% by mass or less, and further preferably 5% by mass or less. By setting the content to 10% by mass or less, an effect of improving the fatigue life commensurate with the content can be expected, and the shear stability tends to be more excellent.
また、粘度調整剤は、α−オレフィンと重合性不飽和結合を有するエステル単量体との共重合体であってもよい。 The viscosity modifier may be a copolymer of an α-olefin and an ester monomer having a polymerizable unsaturated bond.
重合性不飽和結合を有するエステル単量体は、重合性不飽和結合とエステル結合を有する化合物であれば、特に制限されないが、少なくとも一方のカルボキシ基のα炭素とβ炭素とがエチレン性不飽和結合(すなわち、C=C二重結合)を形成している不飽和ジカルボン酸のジエステル体である、α,β−エチレン性不飽和ジカルボン酸ジエステルであることが好ましい。ここで、α,β−エチレン性不飽和ジカルボン酸はマレイン酸、フマル酸、シトラコン酸、メサコン酸等のような、両方のカルボキシ基についてα炭素とβ炭素とがエチレン性不飽和結合を形成しており、かつα,β−エチレン性不飽和結合が主鎖中に存在する化合物に限定されるものではなく、グルタコン酸等のように一方のカルボキシ基のみについてα炭素とβ炭素とがエチレン性不飽和結合をなしている化合物をも包含する概念であり、また、イタコン酸等のようにα,β−エチレン性不飽和結合が側鎖に見出される化合物をも包含する概念である。 The ester monomer having a polymerizable unsaturated bond is not particularly limited as long as it is a compound having a polymerizable unsaturated bond and an ester bond, but at least one of the α carbon and β carbon of the carboxy group is ethylenically unsaturated. An α, β-ethylenically unsaturated dicarboxylic acid diester which is a diester of an unsaturated dicarboxylic acid forming a bond (that is, a C═C double bond) is preferable. Here, the α, β-ethylenically unsaturated dicarboxylic acid forms an ethylenically unsaturated bond with respect to both carboxy groups such as maleic acid, fumaric acid, citraconic acid, and mesaconic acid. And an α, β-ethylenically unsaturated bond is not limited to the compound present in the main chain, and only one carboxy group such as glutaconic acid has the α and β carbons ethylenic. It is a concept that includes a compound having an unsaturated bond, and also includes a compound in which an α, β-ethylenically unsaturated bond is found in the side chain, such as itaconic acid.
α−オレフィンと重合性不飽和結合を有するエステル単量体との共重合体の構造は、特に制限されるものではない。また、製造方法についても特に制限されるものではなく、公知の方法によって製造したものを用いることができる。 The structure of the copolymer of the α-olefin and the ester monomer having a polymerizable unsaturated bond is not particularly limited. Further, the production method is not particularly limited, and those produced by a known method can be used.
α−オレフィンと重合性不飽和結合を有するエステル単量体との共重合体の重量平均分子量は、特に制限されないが、好ましくは2000以上であり、より好ましくは4000以上であり、さらに好ましくは6000以上である。また、好ましくは20000以下であり、より好ましくは15000以下であり、さらに好ましくは12000以下である。その重量平均分子量を2000以上、又は20000以下とすることによって、低温流動性を高めることが可能となる。なお、ここでいう重量平均分子量とは、ウォーターズ社製150−C ALC/GPC装置において東ソー社製のGMHHR−M(7.8mmID×30cm)のカラムを2本直列に使用し、溶媒としてテトラヒドロフランを用い、温度23℃、流速1mL/分、試料濃度1質量%、試料注入量75μLの条件下、示差屈折率計(RI)検出器を用いて測定した標準ポリスチレン換算の重量平均分子量を意味する。 The weight average molecular weight of the copolymer of the α-olefin and the ester monomer having a polymerizable unsaturated bond is not particularly limited, but is preferably 2000 or more, more preferably 4000 or more, and further preferably 6000. That's it. Moreover, Preferably it is 20000 or less, More preferably, it is 15000 or less, More preferably, it is 12000 or less. By setting the weight average molecular weight to 2000 or more or 20000 or less, the low temperature fluidity can be improved. Here, the weight average molecular weight means that two columns of GHSHR-M (7.8 mm ID × 30 cm) manufactured by Tosoh Corporation are used in series in a 150-C ALC / GPC apparatus manufactured by Waters, and tetrahydrofuran is used as a solvent. It means the weight average molecular weight in terms of standard polystyrene measured using a differential refractometer (RI) detector under the conditions of a temperature of 23 ° C., a flow rate of 1 mL / min, a sample concentration of 1 mass%, and a sample injection amount of 75 μL.
α−オレフィンと重合性不飽和結合を有するエステル単量体との共重合体を含有させる場合の含有量は、潤滑油組成物全量基準で、好ましくは0.1質量%以上であり、より好ましくは0.5質量%以上である。また、好ましくは10質量%以下であり、より好ましくは8質量%以下であり、さらに好ましくは5質量%以下である。その含有量を1質量%以上とすることによって、耐摩耗性及び疲労寿命により優れる傾向にある。また、その含有量を10質量%以下とすることによって、充分なせん断安定性、耐摩耗性及び疲労寿命を示す傾向にある。 The content in the case of containing a copolymer of an α-olefin and an ester monomer having a polymerizable unsaturated bond is preferably 0.1% by mass or more, more preferably, based on the total amount of the lubricating oil composition. Is 0.5% by mass or more. Further, it is preferably 10% by mass or less, more preferably 8% by mass or less, and further preferably 5% by mass or less. By setting the content to 1% by mass or more, the wear resistance and fatigue life tend to be more excellent. Moreover, it exists in the tendency which shows sufficient shear stability, abrasion resistance, and fatigue life by making the content into 10 mass% or less.
粘度調整剤は、非分散型若しくは分散型エチレン−α−オレフィン共重合体又はその水素化物、ポリイソブチレン又はその水素化物、スチレン−ジエン水素化共重合体、ポリアルキルスチレンであってもよい。これらの中でも、エチレン−α−オレフィン共重合体又はその水素化物を用いた場合には、せん断安定性に優れた潤滑油組成物を得ることができる。 The viscosity modifier may be a non-dispersed or dispersed ethylene-α-olefin copolymer or a hydrogenated product thereof, polyisobutylene or a hydrogenated product thereof, a styrene-diene hydrogenated copolymer, or a polyalkylstyrene. Among these, when an ethylene-α-olefin copolymer or a hydride thereof is used, a lubricating oil composition having excellent shear stability can be obtained.
非分散型若しくは分散型エチレン−α−オレフィン共重合体又はその水素化物の分子量は、せん断安定性を考慮して選定することが必要である。好ましくは800以上であり、より好ましくは1000以上であり、さらに好ましくは3000以上であり、特に好ましくは15000以上である。また、好ましくは150000以下であり、より好ましくは40000以下であり、さらに好ましくは30000以下であり、特に好ましくは25000以下である。 It is necessary to select the molecular weight of the non-dispersed or dispersed ethylene-α-olefin copolymer or its hydride in consideration of shear stability. Preferably it is 800 or more, More preferably, it is 1000 or more, More preferably, it is 3000 or more, Most preferably, it is 15000 or more. Moreover, it is preferably 150,000 or less, more preferably 40000 or less, further preferably 30000 or less, and particularly preferably 25000 or less.
非分散型若しくは分散型エチレン−α−オレフィン共重合体又はその水素化物を含有させる場合の含有量は、潤滑油組成物全量基準で、好ましくは0.1質量%以上であり、より好ましくは0.5質量%以上である。また、好ましくは10質量%以下であり、より好ましくは8質量%以下であり、さらに好ましくは5質量%以下である。その含有量を1質量%以上とすることによって、耐摩耗性及び疲労寿命により優れる傾向にある。また、その含有量を10質量%以下とすることによって、充分なせん断安定性、耐摩耗性及び疲労寿命を示す傾向にある。 When the non-dispersed or dispersed ethylene-α-olefin copolymer or a hydride thereof is contained, the content is preferably 0.1% by mass or more, more preferably 0, based on the total amount of the lubricating oil composition. .5% by mass or more. Further, it is preferably 10% by mass or less, more preferably 8% by mass or less, and further preferably 5% by mass or less. By setting the content to 1% by mass or more, the wear resistance and fatigue life tend to be more excellent. Moreover, it exists in the tendency which shows sufficient shear stability, abrasion resistance, and fatigue life by making the content into 10 mass% or less.
本実施形態に係る潤滑油組成物は、硫黄含有量、ホウ素含有量及びリン含有量に関して、下記式(1)を満たすものである。
0.01≦[CS/(CB×CP)]≦0.025 (1)
[式中、CSは潤滑油組成物中の硫黄含有量を示し、CBは潤滑油組成物中のホウ素含有量を示し、CPは潤滑油組成物中のリン含有量を示し、CS、CB及びCPはいずれも潤滑油組成物全量基準での含有量(質量)である。]
The lubricating oil composition according to the present embodiment satisfies the following formula (1) with respect to the sulfur content, the boron content, and the phosphorus content.
0.01 ≦ [C S / (C B × C P )] ≦ 0.025 (1)
[Wherein C S represents the sulfur content in the lubricating oil composition, C B represents the boron content in the lubricating oil composition, C P represents the phosphorus content in the lubricating oil composition, and C S, is a content at C B and C P are both lubricating oil composition the total amount (mass). ]
潤滑油組成物中の硫黄含有量、ホウ素含有量及びリン含有量は、ICP元素分析法等によって求めることができる。また、潤滑油基油に配合される各成分を予め、ICP元素分析法等によって分析し、その分析値と各成分の仕込み量から潤滑油組成物中の硫黄含有量、ホウ素含有量及びリン含有量を求めることもできる。 The sulfur content, boron content and phosphorus content in the lubricating oil composition can be determined by ICP elemental analysis or the like. In addition, each component blended in the lubricating base oil is analyzed in advance by ICP elemental analysis, etc., and the sulfur content, boron content and phosphorus content in the lubricating oil composition are determined from the analysis values and the charged amounts of each component. The amount can also be determined.
[CS/(CB×CP)]の下限値は0.01以上であり、好ましくは0.011以上であり、より好ましくは0.012以上であり、さらに好ましくは0.013以上である。一方、[CS/(CB×CP)]の上限値は0.025以下であり、好ましくは0.024以下、より好ましくは0.022以下であり、さらに好ましくは0.02以下である。その下限値は0.01以上、又はその上限値を0.025以下とすることにより、耐摩耗性に優れる傾向にある。 The lower limit of [C S / (C B × C P )] is 0.01 or more, preferably 0.011 or more, more preferably 0.012 or more, and further preferably 0.013 or more. is there. On the other hand, the upper limit of [C S / (C B × C P )] is 0.025 or less, preferably 0.024 or less, more preferably 0.022 or less, and further preferably 0.02 or less. is there. When the lower limit is 0.01 or more, or the upper limit is 0.025 or less, the wear resistance tends to be excellent.
本実施形態に係る潤滑油組成物は、リン及び硫黄を含む添加剤と、ホウ素を含む添加剤と、をさらに含有してもよい。また、上記リン及び硫黄を含む添加剤は、構成元素としてリンを含み硫黄を含まない第1の添加剤と構成元素として硫黄を含みリンを含まない第2の添加剤との組合せ、構成元素としてリン及び硫黄の両方を含む第3の添加剤、前記第1の添加剤と前記第3の添加剤との組合せ、前記第2の添加剤と前記第3の添加剤との組合せ、並びに、前記第1の添加剤と前記第2の添加剤と前記第3の添加剤との組合せからなる群より選ばれる1種であってよい。 The lubricating oil composition according to the present embodiment may further contain an additive containing phosphorus and sulfur and an additive containing boron. The additive containing phosphorus and sulfur is a combination of a first additive containing phosphorus as a constituent element and not containing sulfur and a second additive containing sulfur as a constituent element and no phosphorus, as a constituent element. A third additive comprising both phosphorus and sulfur, a combination of the first additive and the third additive, a combination of the second additive and the third additive, and the It may be one selected from the group consisting of a combination of the first additive, the second additive, and the third additive.
第1の添加剤は、構成元素としてリンを含み硫黄を含まない添加剤である。第1の添加剤としては、亜リン酸エステル類(ホスファイト)、リン酸エステル類、これらのアミン塩、これらの金属塩、これらの誘導体等のリン系極圧剤などが挙げられる。 The first additive is an additive that contains phosphorus as a constituent element and does not contain sulfur. Examples of the first additive include phosphorous extreme pressure agents such as phosphites (phosphites), phosphate esters, amine salts thereof, metal salts thereof, derivatives thereof and the like.
第2の添加剤は、構成元素として硫黄を含みリンを含まない添加剤である。第2の添加剤としては、ジチオカーバメート、亜鉛ジチオカーバメート、モリブデンジチオカーバメイト、ジサルファイド類、ポリサルファイド類、硫化オレフィン類、硫化油脂類、チアジアゾール類等の摩耗防止剤(又は極圧剤)、スルホネート系清浄剤(アルカリ金属又はアルカリ土類金属との正塩、塩基正塩、過塩基性塩)等の金属系清浄剤、チアジアゾール類等の腐食防止剤、アルキルチアジアゾール、メルカプトベンゾチアゾール、1,3,4−チアジアゾールポリスルフィド、1,3,4−チアジアゾリル−2,5−ビスジアルキルジチオカーバメート、2−(アルキルジチオ)ベンゾイミダゾール、β−(o−カルボキシベンジルチオ)プロピオンニトリル等の金属不活性化剤、石油スルホネート、アルキルベンゼンスルホネート、ジノニルナフタレンスルホネート等の防錆剤などが挙げられる。 The second additive is an additive that contains sulfur as a constituent element and does not contain phosphorus. Examples of the second additive include dithiocarbamate, zinc dithiocarbamate, molybdenum dithiocarbamate, disulfides, polysulfides, sulfurized olefins, sulfurized fats and oils, and thiadiazoles, and sulfonate-based additives. Metal detergents such as detergents (normal salts with alkali metals or alkaline earth metals, basic salt, overbased salts), corrosion inhibitors such as thiadiazoles, alkyl thiadiazoles, mercaptobenzothiazoles, 1, 3, Metal deactivators such as 4-thiadiazole polysulfide, 1,3,4-thiadiazolyl-2,5-bisdialkyldithiocarbamate, 2- (alkyldithio) benzimidazole, β- (o-carboxybenzylthio) propiononitrile, Petroleum sulfonate, alkylbenzene sulfonate DOO, like rust agents such as dinonyl naphthalene sulfonate.
第3の添加剤は、構成元素としてリン及び硫黄の両方を含む添加剤である。第3の添加剤としては、ジアルキルジチオリン酸亜鉛(ZnDTP)、チオ亜リン酸エステル類、ジチオ亜リン酸エステル類、トリチオ亜リン酸エステル類、チオリン酸エステル類、ジチオリン酸エステル類、トリチオリン酸エステル類、これらのアミン塩、これらの金属塩、これらの誘導体等の硫黄−リン系の極圧剤などが挙げられる。 The third additive is an additive containing both phosphorus and sulfur as constituent elements. Third additives are zinc dialkyldithiophosphate (ZnDTP), thiophosphites, dithiophosphites, trithiophosphites, thiophosphates, dithiophosphates, trithiophosphates And sulfur-phosphorus extreme pressure agents such as amine salts, metal salts thereof, and derivatives thereof.
ホウ素を含む添加剤としては、ホウ酸変性コハク酸イミド(ホウ素含有コハク酸イミド)等の無灰分散剤などが挙げられる。 Examples of the additive containing boron include ashless dispersants such as boric acid-modified succinimide (boron-containing succinimide).
本実施形態に係る潤滑油組成物には、その目的に応じて潤滑油に一般的に使用されている任意の添加剤を含有させることができる。このような添加剤としては、例えば、金属系清浄剤、無灰分散剤、酸化防止剤、腐食防止剤、防錆剤、抗乳化剤、金属不活性化剤、消泡剤、無灰摩擦調整剤等の添加剤などを挙げることができる。 The lubricating oil composition according to this embodiment may contain any additive generally used in lubricating oils depending on the purpose. Examples of such additives include metal detergents, ashless dispersants, antioxidants, corrosion inhibitors, rust inhibitors, demulsifiers, metal deactivators, antifoaming agents, and ashless friction modifiers. And the like.
金属系清浄剤としては、サリチレート系清浄剤、フェネート系清浄剤等が挙げられ、アルカリ金属又はアルカリ土類金属との正塩、塩基正塩、過塩基性塩のいずれをも配合することができる。使用に際してはこれらの中から任意に選ばれる1種類又は2種類以上を配合することができる。 Examples of metal detergents include salicylate detergents, phenate detergents, and the like, and any of normal salts, basic normal salts, and overbased salts with alkali metals or alkaline earth metals can be blended. . In use, one kind or two or more kinds arbitrarily selected from these can be blended.
無灰分散剤としては、潤滑油に用いられる任意の無灰分散剤が使用でき、例えば、炭素数40〜400の直鎖若しくは分枝状のアルキル基又はアルケニル基を分子中に少なくとも1個有するモノ又はビスコハク酸イミド、炭素数40〜400のアルキル基又はアルケニル基を分子中に少なくとも1個有するベンジルアミン、炭素数40〜400のアルキル基又はアルケニル基を分子中に少なくとも1個有するポリアミン、これらのカルボン酸、リン酸等による変成品などが挙げられる。使用に際してはこれらの中から任意に選ばれる1種類又は2種類以上を配合することができる。 As the ashless dispersant, any ashless dispersant used in lubricating oils can be used. For example, a mono- or mono-chain having at least one linear or branched alkyl group or alkenyl group having 40 to 400 carbon atoms in the molecule. Bisuccinimide, benzylamine having at least one alkyl group or alkenyl group having 40 to 400 carbon atoms in the molecule, polyamine having at least one alkyl group or alkenyl group having 40 to 400 carbon atoms in the molecule, and these carboxylic acids Examples of such modified products include acids and phosphoric acid. In use, one kind or two or more kinds arbitrarily selected from these can be blended.
酸化防止剤としては、フェノール系、アミン系等の無灰酸化防止剤、銅系、モリブデン系等の金属系酸化防止剤が挙げられる。具体的には、例えば、フェノール系無灰酸化防止剤としては、4,4’−メチレンビス(2,6−ジ−tert−ブチルフェノール)、4,4’−ビス(2,6−ジ−tert−ブチルフェノール)等が、アミン系無灰酸化防止剤としては、フェニル−α−ナフチルアミン、アルキルフェニル−α−ナフチルアミン、ジアルキルジフェニルアミン等が挙げられる。 Examples of the antioxidant include ashless antioxidants such as phenols and amines, and metal antioxidants such as copper and molybdenum. Specifically, for example, as a phenol-based ashless antioxidant, 4,4′-methylenebis (2,6-di-tert-butylphenol), 4,4′-bis (2,6-di-tert- Butylphenol) and the like are amine-based ashless antioxidants such as phenyl-α-naphthylamine, alkylphenyl-α-naphthylamine, and dialkyldiphenylamine.
腐食防止剤としては、例えば、ベンゾトリアゾール系、トリルトリアゾール系、イミダゾール系化合物等が挙げられる。 Examples of the corrosion inhibitor include benzotriazole, tolyltriazole, and imidazole compounds.
防錆剤としては、例えば、アルケニルコハク酸エステル、多価アルコールエステル等が挙げられる。 Examples of the rust preventive include alkenyl succinic acid ester and polyhydric alcohol ester.
抗乳化剤としては、例えば、ポリオキシエチレンアルキルエーテル、ポリオキシエチレンアルキルフェニルエーテル、ポリオキシエチレンアルキルナフチルエーテル等のポリアルキレングリコール系非イオン系界面活性剤などが挙げられる。 Examples of the demulsifier include polyalkylene glycol nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, and polyoxyethylene alkyl naphthyl ether.
金属不活性化剤としては、例えば、イミダゾリン、ピリミジン誘導体、ベンゾトリアゾール又はその誘導体等が挙げられる。 Examples of the metal deactivator include imidazoline, pyrimidine derivatives, benzotriazole or derivatives thereof.
消泡剤としては、例えば、25℃における動粘度が1000〜10万mm2/sのシリコーンオイル、アルケニルコハク酸誘導体、ポリヒドロキシ脂肪族アルコールと長鎖脂肪酸とのエステル、メチルサリチレートとo−ヒドロキシベンジルアルコールとのエステル等が挙げられる。 Examples of antifoaming agents include silicone oils having a kinematic viscosity at 25 ° C. of 1000 to 100,000 mm 2 / s, alkenyl succinic acid derivatives, esters of polyhydroxy aliphatic alcohols and long chain fatty acids, methyl salicylates and o -Esters with hydroxybenzyl alcohol and the like.
無灰摩擦調整剤としては、潤滑油用の無灰摩擦調整剤として通常用いられる任意の化合物が使用可能であり、例えば、炭素数6〜30のアルキル基またはアルケニル基、特に炭素数6〜30の直鎖アルキル基または直鎖アルケニル基を分子中に少なくとも1個有する、アミン系、脂肪酸エステル系、脂肪酸アミド系、脂肪酸系、脂肪族アルコール系、脂肪族エーテル系等の無灰摩擦調整剤等が挙げられる。 As the ashless friction modifier, any compound usually used as an ashless friction modifier for lubricating oil can be used. For example, an alkyl group or an alkenyl group having 6 to 30 carbon atoms, particularly 6 to 30 carbon atoms. Ash-free friction modifiers such as amine-based, fatty acid ester-based, fatty acid amide-based, fatty acid-based, aliphatic alcohol-based, aliphatic ether-based, etc. having at least one linear alkyl group or linear alkenyl group in the molecule Is mentioned.
本実施形態に係る潤滑油組成物の100℃における動粘度は、特に制限されないが、好ましくは3.5mm2/s以上であり、より好ましくは3.7mm2/s以上であり、さらに3.9mm2/s以上である。また、好ましくは7.0mm2/s以下であり、より好ましくは6.5mm2/s以下であり、さらに好ましくは6.0mm2/s以下である。100℃動粘度を3.5mm2/s以上とすることによって、油膜形成が充分となり、潤滑性により優れる傾向にある。また、100℃動粘度を7.0mm2/s以下とすることによって、低温流動性に優れる傾向にある。 The kinematic viscosity at 100 ° C. of the lubricating oil composition according to the present embodiment is not particularly limited, but is preferably 3.5 mm 2 / s or more, more preferably 3.7 mm 2 / s or more, and further 3. 9 mm 2 / s or more. Moreover, it is 7.0 mm < 2 > / s or less preferably, More preferably, it is 6.5 mm < 2 > / s or less, More preferably, it is 6.0 mm < 2 > / s or less. By setting the 100 ° C. kinematic viscosity to 3.5 mm 2 / s or more, the formation of an oil film is sufficient, and the lubricity tends to be excellent. Moreover, it exists in the tendency which is excellent in low-temperature fluidity | liquidity by making 100 degreeC kinematic viscosity 7.0 mm < 2 > / s or less.
本実施形態に係る潤滑油組成物の−40℃におけるBF粘度は、特に限定されないが、好ましくは10000mPa・s以下であり、より好ましくは8000mPa・s以下であり、さらに好ましくは7000mPa・s以下である。BF粘度を10000mPa・s以下とすることにより、充分な低温流動性が得られる。 The BF viscosity at −40 ° C. of the lubricating oil composition according to this embodiment is not particularly limited, but is preferably 10000 mPa · s or less, more preferably 8000 mPa · s or less, and even more preferably 7000 mPa · s or less. is there. Sufficient low-temperature fluidity can be obtained by setting the BF viscosity to 10,000 mPa · s or less.
本実施形態に係る潤滑油組成物は、低温流動性及びせん断安定性に優れ、省燃費化が可能な耐摩耗性及び疲労寿命に優れるため、ハイブリッド車又は電気自動車の減速機用に好適に用いることができる。中でも補助動力源がない電気自動車用として好適である。より好ましくは電動モーター用又はインホイールモーター用であり、さらに好ましくはインホイールモーター用である。 The lubricating oil composition according to the present embodiment is excellent in low-temperature fluidity and shear stability, and is excellent in wear resistance and fatigue life that can save fuel, and is therefore suitably used for a hybrid vehicle or electric vehicle reducer. be able to. Among them, it is suitable for an electric vehicle having no auxiliary power source. More preferably for an electric motor or an in-wheel motor, and still more preferably for an in-wheel motor.
以上、本発明の好適な実施形態について説明したが、本発明は上記実施形態に限定されるものではない。 The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.
例えば、本発明の一態様は、上記(A)合成系基油を含み、25℃でのトラクション係数が0.007以下である潤滑油基油と、上記(B)重量平均分子量が40000〜100000の流動点降下剤と、を含有し、潤滑油組成物全量基準で、流動点降下剤の含有量が0.1〜1.0質量%であり、上記式(1)を満たす組成物の、ハイブリッド車又は電気自動車の減速機用潤滑油としての使用に関する。また、例えば、本発明の別の一態様は、上記(A)合成系基油を含み、25℃でのトラクション係数が0.007以下である潤滑油基油と、上記(B)重量平均分子量が40000〜100000の流動点降下剤と、を含有し、潤滑油組成物全量基準で、流動点降下剤の含有量が0.1〜1.0質量%であり、上記式(1)を満たす組成物の、ハイブリッド車又は電気自動車の減速機用潤滑油の製造のための使用に関する。 For example, one embodiment of the present invention includes (A) a synthetic base oil, a lubricating base oil having a traction coefficient at 25 ° C. of 0.007 or less, and (B) a weight average molecular weight of 40,000 to 100,000. A pour point depressant, and based on the total amount of the lubricating oil composition, the content of the pour point depressant is 0.1 to 1.0% by mass, and satisfies the above formula (1), The present invention relates to use as a lubricant for a reduction gear of a hybrid vehicle or an electric vehicle. Further, for example, another embodiment of the present invention includes the (A) synthetic base oil and a lubricating base oil having a traction coefficient of 0.007 or less at 25 ° C. and the (B) weight average molecular weight. Of pour point depressant of 40000-100,000, and based on the total amount of the lubricating oil composition, the content of the pour point depressant is 0.1 to 1.0% by mass and satisfies the above formula (1). The present invention relates to the use of the composition for the production of a reduction gear lubricant for hybrid vehicles or electric vehicles.
以下、実施例により本発明をより具体的に説明するが、本発明は実施例に限定されるものではない。 EXAMPLES Hereinafter, although an Example demonstrates this invention more concretely, this invention is not limited to an Example.
(実施例1〜18及び比較例1〜11)
表1及び表2に示すように、実施例1〜18及び比較例1〜11の潤滑油組成物をそれぞれ調製した。得られた潤滑油組成物について、低温流動性、せん断安定性、耐摩耗性及び疲労寿命を測定し、その結果を表1及び表2に併記した。
(Examples 1-18 and Comparative Examples 1-11)
As shown in Table 1 and Table 2, the lubricating oil compositions of Examples 1 to 18 and Comparative Examples 1 to 11 were prepared, respectively. About the obtained lubricating oil composition, low-temperature fluidity | liquidity, shear stability, abrasion resistance, and fatigue life were measured, and the result was written together in Table 1 and Table 2.
表1及び表2に示した各成分の詳細は以下のとおりである。
基油A−1:ポリα−オレフィン[グループIV、40℃動粘度:16.95mm2/s、100℃動粘度:3.862mm2/s、粘度指数:122、25℃でのトラクション係数:0.00434]
基油A−2:ポリα−オレフィン[グループIV、40℃動粘度:30.59mm2/s、100℃動粘度:6.012mm2/s、粘度指数:147、25℃でのトラクション係数:0.00662]
基油A−3:ワックス異性化基油[グループIII+、40℃動粘度:16.86mm2/s、100℃動粘度:4.028mm2/s、粘度指数:142、25℃でのトラクション係数:0.00395]
基油A−4:水素化精製鉱油[グループIII、40℃動粘度:8.667mm2/s、100℃動粘度:2.395mm2/s、粘度指数:91、25℃でのトラクション係数:0.0128]
基油A−5:水素化精製鉱油[グループIII、40℃動粘度:18.68mm2/s、100℃動粘度:4.160mm2/s、粘度指数:127、25℃でのトラクション係数:0.0088]
基油A−6:溶剤精製基油[グループI、40℃動粘度:243.1mm2/s、100℃動粘度:20.46mm2/s、粘度指数:98、25℃でのトラクション係数:0.0238]
基油A−7:二塩基酸エステル[グループV、アゼライン酸+2エチルヘキサノール、40℃動粘度:10.3mm2/s、100℃動粘度:2.9mm2/s、粘度指数:138、25℃でのトラクション係数:0.00303、流動点:−72℃、引火点:220℃]
基油A−8:一塩基酸エステル[グループV、オレイン酸+2エチルヘキサノール、40℃動粘度:8.4mm2/s、100℃動粘度:2.7mm2/s、粘度指数:174、25℃でのトラクション係数:0.00192、流動点:−40℃、引火点:224℃]
流動点降下剤B−1:ポリメタクリレート系流動点降下剤[重量平均分子量:46000]
流動点降下剤B−2:ポリメタクリレート系流動点降下剤[重量平均分子量:170000]
粘度調整剤C−1:ポリメタクリレート系粘度調整剤[重量平均分子量:20000、R2が炭素数20〜24の炭化水素基である一般式(1)で表される構造単位の構成比:40モル%]
粘度調整剤C−2:α−オレフィンとカルボン酸との共重合体[重量平均分子量:12000]
粘度調整剤C−3:エチレンとα−オレフィンとの共重合体[数平均分子量:13000]
摩耗防止剤D−1:亜リン酸エステル[リン元素換算:13.2質量%]
極圧剤E−1:チアジアゾール[硫黄元素換算:36質量%]
分散剤F−1:ホウ酸変性コハク酸イミド[重量平均分子量:1000、ホウ素元素換算:1.5質量%]
ATFパッケージG−1:コハク酸イミド、ホウ素含有コハク酸イミド、硫黄含有亜リン酸エステル、カルシウムスルフォネート、金属不活性化剤、摩擦調整剤、消泡剤、希釈油等のパッケージ添加剤[パッケージ添加剤全量基準で、硫黄元素換算:0.44質量%、ホウ素元素換算:0.12質量%、リン元素換算:0.24質量%]
Details of each component shown in Table 1 and Table 2 are as follows.
Base oil A-1: Poly α-olefin [Group IV, kinematic viscosity at 40 ° C .: 16.95 mm 2 / s, kinematic viscosity at 100 ° C .: 3.862 mm 2 / s, viscosity index: 122, traction coefficient at 25 ° C .: 0.00434]
Base oil A-2: Poly α-olefin [Group IV, kinematic viscosity at 40 ° C .: 30.59 mm 2 / s, kinematic viscosity at 100 ° C .: 6.012 mm 2 / s, viscosity index: 147, traction coefficient at 25 ° C .: 0.00662]
Base oil A-3: Wax isomerized base oil [Group III + , 40 ° C. kinematic viscosity: 16.86 mm 2 / s, 100 ° C. kinematic viscosity: 4.028 mm 2 / s, viscosity index: 142, traction at 25 ° C. Coefficient: 0.00395]
Base oil A-4: hydrorefined mineral oil [Group III, kinematic viscosity at 40 ° C .: 8.667 mm 2 / s, kinematic viscosity at 100 ° C .: 2.395 mm 2 / s, viscosity index: 91, traction coefficient at 25 ° C .: 0.0128]
Base oil A-5: hydrorefined mineral oil [Group III, kinematic viscosity at 40 ° C .: 18.68 mm 2 / s, kinematic viscosity at 100 ° C .: 4.160 mm 2 / s, viscosity index: 127, traction coefficient at 25 ° C .: 0.0088]
Base oil A-6: Solvent refined base oil [Group I, 40 ° C. kinematic viscosity: 243.1 mm 2 / s, 100 ° C. kinematic viscosity: 20.46 mm 2 / s, viscosity index: 98, traction coefficient at 25 ° C .: 0.0238]
Base oil A-7: Dibasic acid ester [Group V, azelaic acid + 2 ethylhexanol, 40 ° C. kinematic viscosity: 10.3 mm 2 / s, 100 ° C. kinematic viscosity: 2.9 mm 2 / s, viscosity index: 138, 25 Traction coefficient at ° C: 0.00303, pour point: -72 ° C, flash point: 220 ° C]
Base oil A-8: monobasic acid ester [Group V, oleic acid + 2 ethylhexanol, 40 ° C. kinematic viscosity: 8.4 mm 2 / s, 100 ° C. kinematic viscosity: 2.7 mm 2 / s, viscosity index: 174, 25 Traction coefficient at ° C: 0.00192, pour point: -40 ° C, flash point: 224 ° C]
Pour point depressant B-1: Polymethacrylate pour point depressant [weight average molecular weight: 46000]
Pour point depressant B-2: Polymethacrylate pour point depressant [weight average molecular weight: 170000]
Viscosity modifier C-1: polymethacrylate viscosity modifier [weight average molecular weight: 20000, R 2 is a hydrocarbon group having 20 to 24 carbon atoms, the structural ratio of the structural unit represented by the general formula (1): 40 Mol%]
Viscosity modifier C-2: Copolymer of α-olefin and carboxylic acid [weight average molecular weight: 12000]
Viscosity modifier C-3: Copolymer of ethylene and α-olefin [number average molecular weight: 13000]
Antiwear agent D-1: Phosphite [phosphorus element conversion: 13.2% by mass]
Extreme pressure agent E-1: thiadiazole [in terms of elemental sulfur: 36% by mass]
Dispersant F-1: Boric acid-modified succinimide [weight average molecular weight: 1000, boron element equivalent: 1.5% by mass]
ATF package G-1: package additives such as succinimide, boron-containing succinimide, sulfur-containing phosphite, calcium sulfonate, metal deactivator, friction modifier, antifoaming agent, and diluent oil [ Based on the total amount of the package additive, sulfur element conversion: 0.44 mass%, boron element conversion: 0.12 mass%, phosphorus element conversion: 0.24 mass%]
潤滑油組成物における硫黄含有量、ホウ素含有量及びリン含有量は、ICP元素分析法によって求めた。また、摩耗防止剤のリン元素換算量、極圧剤の硫黄元素換算量、分散剤のホウ素元素換算量、並びにATFパッケージの硫黄元素換算量、ホウ素元素換算量及びリン元素換算量についても、ICP元素分析法によって求めた。 The sulfur content, boron content and phosphorus content in the lubricating oil composition were determined by ICP elemental analysis. In addition, the phosphorus element equivalent amount of the antiwear agent, the sulfur element equivalent amount of the extreme pressure agent, the boron element equivalent amount of the dispersant, the sulfur element equivalent amount of the ATF package, the boron element equivalent amount and the phosphorus element equivalent amount are also measured. Obtained by elemental analysis.
(1)低温流動性
ASTM D 2983に準拠し、各潤滑油組成物の−40℃におけるBF粘度を測定した。本試験においては、BF粘度の値が小さいものほど低温流動性に優れていることを意味する。
(2)せん断安定性試験
JPI−5S−29−88に準拠し、測定温度100℃、照射時間10時間でソニックテストを行い、ソニックテスト前後の100℃動粘度から、その低下率を測定した。本試験においては、低下率が小さいものほどせん断安定性に優れていることを意味する。
(3)耐摩耗性試験
ASTM D 2596に準拠し、高速四球試験機を用い、各潤滑油組成物の1800回転における最大非焼付き荷重(LNSL)を測定した。本試験においては、最大非焼付き荷重が大きいほど耐摩耗性に優れていることを意味する。
また、以下の条件により、四球試験(ASTM D4172)を行い、摩耗痕径(mm)を測定して耐摩耗性を評価した。本試験においては、摩耗痕径が小さいほど耐摩耗性に優れていることを意味する。
荷重:392N
回転数:1800rpm
温度:80℃
試験時間:30分間
(4)疲労寿命試験
FZG試験機を用いて以下の条件で運転を行い、歯車にピッチングが発生するまでのギヤの疲労寿命を評価した。
荷重ステージ:9
油温:120℃
回転数:1440rpm
(1) Low temperature fluidity Based on ASTM D 2983, the BF viscosity at −40 ° C. of each lubricating oil composition was measured. In this test, the smaller the value of the BF viscosity, the better the low temperature fluidity.
(2) Shear Stability Test In accordance with JPI-5S-29-88, a sonic test was performed at a measurement temperature of 100 ° C. and an irradiation time of 10 hours, and the rate of decrease was measured from the 100 ° C. kinematic viscosity before and after the sonic test. In this test, the smaller the reduction rate, the better the shear stability.
(3) Abrasion resistance test Based on ASTM D 2596, a maximum non-seizure load (LNSL) at 1800 revolutions of each lubricating oil composition was measured using a high-speed four-ball tester. In this test, the larger the maximum non-seizure load, the better the wear resistance.
In addition, a four-ball test (ASTM D4172) was performed under the following conditions, and the wear scar diameter (mm) was measured to evaluate the wear resistance. In this test, the smaller the wear scar diameter, the better the wear resistance.
Load: 392N
Rotation speed: 1800rpm
Temperature: 80 ° C
Test time: 30 minutes (4) Fatigue life test An FZG tester was used to perform the operation under the following conditions to evaluate the fatigue life of the gears until the gears were pitched.
Load stage: 9
Oil temperature: 120 ° C
Rotation speed: 1440rpm
表1及び表2から明らかであるように、実施例1〜18の潤滑油組成物は、低温流動性(例えば、−40℃におけるBF粘度が10000mPa・s以下)、せん断安定性(例えば、100℃動粘度低下率が2.0%以下)、耐摩耗性(例えば、最大非焼付き荷重が618N以上、摩耗痕径が0.60mm以下)及び疲労寿命(例えば、24時間以上)にバランス良く優れていることが分かった。 As is clear from Tables 1 and 2, the lubricating oil compositions of Examples 1 to 18 have low-temperature fluidity (for example, a BF viscosity at −40 ° C. of 10,000 mPa · s or less) and shear stability (for example, 100 The rate of decrease in kinematic viscosity is 2.0% or less), wear resistance (for example, maximum non-seizure load is 618 N or more, wear scar diameter is 0.60 mm or less), and fatigue life (for example, 24 hours or more) is well balanced. I found it excellent.
Claims (4)
重量平均分子量が40000〜100000の流動点降下剤と、
を含有し、潤滑油組成物全量基準で、前記流動点降下剤の含有量が0.1〜1.0質量%であり、下記式(1)を満たす、ハイブリッド車又は電気自動車の減速機用潤滑油組成物。
0.01≦[CS/(CB×CP)]≦0.025 (1)
[式中、CSは潤滑油組成物中の硫黄含有量を示し、CBは潤滑油組成物中のホウ素含有量を示し、CPは潤滑油組成物中のリン含有量を示し、CS、CB及びCPはいずれも潤滑油組成物全量基準での含有量(質量)である。] A lubricating base oil containing a synthetic base oil and having a traction coefficient at 25 ° C. of 0.007 or less;
A pour point depressant having a weight average molecular weight of 40,000 to 100,000,
For a reduction gear of a hybrid vehicle or an electric vehicle, wherein the content of the pour point depressant is 0.1 to 1.0% by mass based on the total amount of the lubricating oil composition and satisfies the following formula (1) Lubricating oil composition.
0.01 ≦ [C S / (C B × C P )] ≦ 0.025 (1)
[Wherein C S represents the sulfur content in the lubricating oil composition, C B represents the boron content in the lubricating oil composition, C P represents the phosphorus content in the lubricating oil composition, and C S, is a content at C B and C P are both lubricating oil composition the total amount (mass). ]
ホウ素を含む添加剤と、
をさらに含有し、
前記リン及び硫黄を含む添加剤が、構成元素としてリンを含み硫黄を含まない第1の添加剤と構成元素として硫黄を含みリンを含まない第2の添加剤との組合せ、構成元素としてリン及び硫黄の両方を含む第3の添加剤、前記第1の添加剤と前記第3の添加剤との組合せ、前記第2の添加剤と前記第3の添加剤との組合せ、並びに、前記第1の添加剤と前記第2の添加剤と前記第3の添加剤との組合せからなる群より選ばれる1種である、請求項1に記載のハイブリッド車又は電気自動車の減速機用潤滑油組成物。 An additive comprising phosphorus and sulfur;
An additive comprising boron;
Further containing
The additive containing phosphorus and sulfur is a combination of a first additive that contains phosphorus as a constituent element and does not contain sulfur, and a second additive that contains sulfur as a constituent element and does not contain phosphorus, phosphorus as a constituent element, and A third additive comprising both sulfur, a combination of the first additive and the third additive, a combination of the second additive and the third additive, and the first The lubricating oil composition for a hybrid vehicle or electric vehicle according to claim 1, wherein the lubricating oil composition is one selected from the group consisting of a combination of the additive, the second additive, and the third additive. .
前記組成物が、
合成系基油を含み、25℃でのトラクション係数が0.007以下である潤滑油基油と、
重量平均分子量が40000〜100000の流動点降下剤と、
を含有し、潤滑油組成物全量基準で、前記流動点降下剤の含有量が0.1〜1.0質量%であり、下記式(1)を満たす、使用。
0.01≦[CS/(CB×CP)]≦0.025 (1)
[式中、CSは潤滑油組成物中の硫黄含有量を示し、CBは潤滑油組成物中のホウ素含有量を示し、CPは潤滑油組成物中のリン含有量を示し、CS、CB及びCPはいずれも潤滑油組成物全量基準での含有量(質量)である。] Use of the composition as a lubricant for a reduction gear of a hybrid vehicle or an electric vehicle,
The composition is
A lubricating base oil containing a synthetic base oil and having a traction coefficient at 25 ° C. of 0.007 or less;
A pour point depressant having a weight average molecular weight of 40,000 to 100,000,
The content of the pour point depressant is 0.1 to 1.0% by mass based on the total amount of the lubricating oil composition, and satisfies the following formula (1).
0.01 ≦ [C S / (C B × C P )] ≦ 0.025 (1)
[Wherein C S represents the sulfur content in the lubricating oil composition, C B represents the boron content in the lubricating oil composition, C P represents the phosphorus content in the lubricating oil composition, and C S, is a content at C B and C P are both lubricating oil composition the total amount (mass). ]
前記組成物が、
合成系基油を含み、25℃でのトラクション係数が0.007以下である潤滑油基油と、
重量平均分子量が40000〜100000の流動点降下剤と、
を含有し、潤滑油組成物全量基準で、前記流動点降下剤の含有量が0.1〜1.0質量%であり、下記式(1)を満たす、使用。
0.01≦[CS/(CB×CP)]≦0.025 (1)
[式中、CSは潤滑油組成物中の硫黄含有量を示し、CBは潤滑油組成物中のホウ素含有量を示し、CPは潤滑油組成物中のリン含有量を示し、CS、CB及びCPはいずれも潤滑油組成物全量基準での含有量(質量)である。] Use of the composition for the manufacture of a lubricant for a reduction gear of a hybrid vehicle or an electric vehicle,
The composition is
A lubricating base oil containing a synthetic base oil and having a traction coefficient at 25 ° C. of 0.007 or less;
A pour point depressant having a weight average molecular weight of 40,000 to 100,000,
The content of the pour point depressant is 0.1 to 1.0% by mass based on the total amount of the lubricating oil composition, and satisfies the following formula (1).
0.01 ≦ [C S / (C B × C P )] ≦ 0.025 (1)
[Wherein C S represents the sulfur content in the lubricating oil composition, C B represents the boron content in the lubricating oil composition, C P represents the phosphorus content in the lubricating oil composition, and C S, is a content at C B and C P are both lubricating oil composition the total amount (mass). ]
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |