WO2022209487A1 - 潤滑油組成物 - Google Patents
潤滑油組成物 Download PDFInfo
- Publication number
- WO2022209487A1 WO2022209487A1 PCT/JP2022/007934 JP2022007934W WO2022209487A1 WO 2022209487 A1 WO2022209487 A1 WO 2022209487A1 JP 2022007934 W JP2022007934 W JP 2022007934W WO 2022209487 A1 WO2022209487 A1 WO 2022209487A1
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- WO
- WIPO (PCT)
- Prior art keywords
- group
- lubricating oil
- oil composition
- molybdenum
- groups
- Prior art date
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- 239000000203 mixture Substances 0.000 title claims abstract description 92
- 239000010687 lubricating oil Substances 0.000 title claims abstract description 89
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 47
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000011733 molybdenum Substances 0.000 claims abstract description 42
- 229920000642 polymer Polymers 0.000 claims abstract description 40
- 239000002199 base oil Substances 0.000 claims abstract description 31
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 19
- 239000011707 mineral Substances 0.000 claims abstract description 19
- -1 molybdenum amine Chemical class 0.000 claims description 75
- 239000003607 modifier Substances 0.000 claims description 33
- KHYKFSXXGRUKRE-UHFFFAOYSA-J molybdenum(4+) tetracarbamodithioate Chemical compound C(N)([S-])=S.[Mo+4].C(N)([S-])=S.C(N)([S-])=S.C(N)([S-])=S KHYKFSXXGRUKRE-UHFFFAOYSA-J 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 claims description 12
- 230000001050 lubricating effect Effects 0.000 claims description 11
- 229920000098 polyolefin Polymers 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 abstract description 24
- 230000000694 effects Effects 0.000 abstract description 18
- 230000003746 surface roughness Effects 0.000 abstract description 7
- 125000004432 carbon atom Chemical group C* 0.000 description 51
- 150000001875 compounds Chemical class 0.000 description 26
- 239000003446 ligand Substances 0.000 description 23
- 230000001603 reducing effect Effects 0.000 description 22
- 229910052751 metal Inorganic materials 0.000 description 21
- 239000002184 metal Substances 0.000 description 21
- 125000001424 substituent group Chemical group 0.000 description 21
- 125000000217 alkyl group Chemical group 0.000 description 17
- 239000003599 detergent Substances 0.000 description 15
- 125000001931 aliphatic group Chemical group 0.000 description 14
- 125000001183 hydrocarbyl group Chemical group 0.000 description 14
- 125000000129 anionic group Chemical group 0.000 description 13
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 12
- 238000009826 distribution Methods 0.000 description 12
- 125000000962 organic group Chemical group 0.000 description 12
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 11
- 125000003342 alkenyl group Chemical group 0.000 description 11
- 239000003963 antioxidant agent Substances 0.000 description 11
- 239000003795 chemical substances by application Substances 0.000 description 11
- 229910052749 magnesium Inorganic materials 0.000 description 10
- 239000011777 magnesium Substances 0.000 description 10
- 150000001336 alkenes Chemical class 0.000 description 9
- 125000004429 atom Chemical group 0.000 description 9
- 229910052791 calcium Inorganic materials 0.000 description 9
- 239000011575 calcium Substances 0.000 description 9
- 235000014113 dietary fatty acids Nutrition 0.000 description 9
- 239000000194 fatty acid Substances 0.000 description 9
- 229930195729 fatty acid Natural products 0.000 description 9
- 229910052717 sulfur Inorganic materials 0.000 description 9
- 150000001450 anions Chemical class 0.000 description 8
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 7
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 7
- 125000004434 sulfur atom Chemical group 0.000 description 7
- 125000003118 aryl group Chemical group 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000000446 fuel Substances 0.000 description 6
- 239000002480 mineral oil Substances 0.000 description 6
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 5
- 229910052784 alkaline earth metal Chemical group 0.000 description 5
- 150000001342 alkaline earth metals Chemical class 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 5
- 150000004665 fatty acids Chemical class 0.000 description 5
- 125000004430 oxygen atom Chemical group O* 0.000 description 5
- 239000012188 paraffin wax Substances 0.000 description 5
- 125000004437 phosphorous atom Chemical group 0.000 description 5
- 229920000193 polymethacrylate Polymers 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 5
- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 4
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 229910052783 alkali metal Inorganic materials 0.000 description 4
- 150000001340 alkali metals Chemical group 0.000 description 4
- 150000001412 amines Chemical class 0.000 description 4
- 229910052788 barium Inorganic materials 0.000 description 4
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 4
- 239000002585 base Substances 0.000 description 4
- 239000010779 crude oil Substances 0.000 description 4
- 125000000753 cycloalkyl group Chemical group 0.000 description 4
- 150000002148 esters Chemical class 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 4
- 125000002960 margaryl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 4
- 235000010446 mineral oil Nutrition 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 125000005064 octadecenyl group Chemical group C(=CCCCCCCCCCCCCCCCC)* 0.000 description 4
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 4
- 229920001083 polybutene Polymers 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 239000003981 vehicle Substances 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 150000003973 alkyl amines Chemical class 0.000 description 3
- 125000002877 alkyl aryl group Chemical group 0.000 description 3
- 125000003710 aryl alkyl group Chemical group 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 125000005265 dialkylamine group Chemical group 0.000 description 3
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 3
- 125000005066 dodecenyl group Chemical group C(=CCCCCCCCCCC)* 0.000 description 3
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 125000000524 functional group Chemical group 0.000 description 3
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000005078 molybdenum compound Substances 0.000 description 3
- 150000002752 molybdenum compounds Chemical class 0.000 description 3
- 239000010705 motor oil Substances 0.000 description 3
- 125000001421 myristyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 125000001117 oleyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])/C([H])=C([H])\C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 125000002958 pentadecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- PTISTKLWEJDJID-UHFFFAOYSA-N sulfanylidenemolybdenum Chemical class [Mo]=S PTISTKLWEJDJID-UHFFFAOYSA-N 0.000 description 3
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 125000005063 tetradecenyl group Chemical group C(=CCCCCCCCCCCCC)* 0.000 description 3
- 125000005040 tridecenyl group Chemical group C(=CCCCCCCCCCCC)* 0.000 description 3
- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- CRSBERNSMYQZNG-UHFFFAOYSA-N 1-dodecene Chemical compound CCCCCCCCCCC=C CRSBERNSMYQZNG-UHFFFAOYSA-N 0.000 description 2
- ADOBXTDBFNCOBN-UHFFFAOYSA-N 1-heptadecene Chemical compound CCCCCCCCCCCCCCCC=C ADOBXTDBFNCOBN-UHFFFAOYSA-N 0.000 description 2
- GQEZCXVZFLOKMC-UHFFFAOYSA-N 1-hexadecene Chemical compound CCCCCCCCCCCCCCC=C GQEZCXVZFLOKMC-UHFFFAOYSA-N 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 2
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 2
- PJLHTVIBELQURV-UHFFFAOYSA-N 1-pentadecene Chemical compound CCCCCCCCCCCCCC=C PJLHTVIBELQURV-UHFFFAOYSA-N 0.000 description 2
- HFDVRLIODXPAHB-UHFFFAOYSA-N 1-tetradecene Chemical compound CCCCCCCCCCCCC=C HFDVRLIODXPAHB-UHFFFAOYSA-N 0.000 description 2
- ULQISTXYYBZJSJ-UHFFFAOYSA-N 12-hydroxyoctadecanoic acid Chemical compound CCCCCCC(O)CCCCCCCCCCC(O)=O ULQISTXYYBZJSJ-UHFFFAOYSA-N 0.000 description 2
- BVUXDWXKPROUDO-UHFFFAOYSA-N 2,6-di-tert-butyl-4-ethylphenol Chemical compound CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 BVUXDWXKPROUDO-UHFFFAOYSA-N 0.000 description 2
- BITAPBDLHJQAID-KTKRTIGZSA-N 2-[2-hydroxyethyl-[(z)-octadec-9-enyl]amino]ethanol Chemical compound CCCCCCCC\C=C/CCCCCCCCN(CCO)CCO BITAPBDLHJQAID-KTKRTIGZSA-N 0.000 description 2
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical compound CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 2
- XQVWYOYUZDUNRW-UHFFFAOYSA-N N-Phenyl-1-naphthylamine Chemical compound C=1C=CC2=CC=CC=C2C=1NC1=CC=CC=C1 XQVWYOYUZDUNRW-UHFFFAOYSA-N 0.000 description 2
- KEQFTVQCIQJIQW-UHFFFAOYSA-N N-Phenyl-2-naphthylamine Chemical compound C=1C=C2C=CC=CC2=CC=1NC1=CC=CC=C1 KEQFTVQCIQJIQW-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Chemical compound P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 125000002723 alicyclic group Chemical group 0.000 description 2
- 150000001447 alkali salts Chemical class 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 2
- 239000002518 antifoaming agent Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 125000001204 arachidyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 125000002511 behenyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- IAQRGUVFOMOMEM-UHFFFAOYSA-N but-2-ene Chemical compound CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 2
- 150000001721 carbon Chemical group 0.000 description 2
- 238000004517 catalytic hydrocracking Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 125000003493 decenyl group Chemical group [H]C([*])=C([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 125000002704 decyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- 239000000539 dimer Substances 0.000 description 2
- 150000002019 disulfides Chemical class 0.000 description 2
- 150000002170 ethers Chemical class 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000005227 gel permeation chromatography Methods 0.000 description 2
- 125000000755 henicosyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 125000006038 hexenyl group Chemical group 0.000 description 2
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000006078 metal deactivator Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 2
- 150000002763 monocarboxylic acids Chemical class 0.000 description 2
- VAMFXQBUQXONLZ-UHFFFAOYSA-N n-alpha-eicosene Natural products CCCCCCCCCCCCCCCCCCC=C VAMFXQBUQXONLZ-UHFFFAOYSA-N 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- NHLUYCJZUXOUBX-UHFFFAOYSA-N nonadec-1-ene Chemical compound CCCCCCCCCCCCCCCCCC=C NHLUYCJZUXOUBX-UHFFFAOYSA-N 0.000 description 2
- 125000001196 nonadecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 125000005187 nonenyl group Chemical group C(=CCCCCCCC)* 0.000 description 2
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- CCCMONHAUSKTEQ-UHFFFAOYSA-N octadec-1-ene Chemical compound CCCCCCCCCCCCCCCCC=C CCCMONHAUSKTEQ-UHFFFAOYSA-N 0.000 description 2
- 125000004365 octenyl group Chemical group C(=CCCCCCC)* 0.000 description 2
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 2
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical class [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920013639 polyalphaolefin Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
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- 239000002904 solvent Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 150000005846 sugar alcohols Polymers 0.000 description 2
- 150000004763 sulfides Chemical class 0.000 description 2
- 150000003871 sulfonates Chemical class 0.000 description 2
- 125000005065 undecenyl group Chemical group C(=CCCCCCCCCC)* 0.000 description 2
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- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- WBHHMMIMDMUBKC-XLNAKTSKSA-N ricinelaidic acid Chemical compound CCCCCC[C@@H](O)C\C=C\CCCCCCCC(O)=O WBHHMMIMDMUBKC-XLNAKTSKSA-N 0.000 description 1
- 229960003656 ricinoleic acid Drugs 0.000 description 1
- FEUQNCSVHBHROZ-UHFFFAOYSA-N ricinoleic acid Natural products CCCCCCC(O[Si](C)(C)C)CC=CCCCCCCCC(=O)OC FEUQNCSVHBHROZ-UHFFFAOYSA-N 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- YGSDEFSMJLZEOE-UHFFFAOYSA-M salicylate Chemical compound OC1=CC=CC=C1C([O-])=O YGSDEFSMJLZEOE-UHFFFAOYSA-M 0.000 description 1
- 229960001860 salicylate Drugs 0.000 description 1
- 150000003873 salicylate salts Chemical class 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 125000003107 substituted aryl group Chemical group 0.000 description 1
- 150000003457 sulfones Chemical class 0.000 description 1
- 150000003462 sulfoxides Chemical class 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- VLLMWSRANPNYQX-UHFFFAOYSA-N thiadiazole Chemical compound C1=CSN=N1.C1=CSN=N1 VLLMWSRANPNYQX-UHFFFAOYSA-N 0.000 description 1
- 150000003558 thiocarbamic acid derivatives Chemical class 0.000 description 1
- 150000003567 thiocyanates Chemical class 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 125000002469 tricosyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- WMYJOZQKDZZHAC-UHFFFAOYSA-H trizinc;dioxido-sulfanylidene-sulfido-$l^{5}-phosphane Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([S-])=S.[O-]P([O-])([S-])=S WMYJOZQKDZZHAC-UHFFFAOYSA-H 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000005292 vacuum distillation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
- C10M169/044—Mixtures of base-materials and additives the additives being a mixture of non-macromolecular and macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
- C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
- C10M137/04—Phosphate esters
- C10M137/10—Thio derivatives
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M139/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing atoms of elements not provided for in groups C10M127/00 - C10M137/00
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
- C10M141/12—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic compound containing atoms of elements not provided for in groups C10M141/02 - C10M141/10
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M143/00—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation
- C10M143/08—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation containing aliphatic monomer having more than 4 carbon atoms
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M161/00—Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M2203/102—Aliphatic fractions
- C10M2203/1025—Aliphatic fractions used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
- C10M2205/026—Butene
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
- C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
- C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
- C10M2219/066—Thiocarbamic type compounds
- C10M2219/068—Thiocarbamate metal salts
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
- C10M2223/045—Metal containing thio derivatives
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
- C10M2227/06—Organic compounds derived from inorganic acids or metal salts
- C10M2227/066—Organic compounds derived from inorganic acids or metal salts derived from Mo or W
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
- C10M2227/09—Complexes with metals
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2290/00—Mixtures of base materials or thickeners or additives
- C10M2290/02—Mineral base oils; Mixtures of fractions
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2010/00—Metal present as such or in compounds
- C10N2010/12—Groups 6 or 16
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/02—Viscosity; Viscosity index
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/04—Molecular weight; Molecular weight distribution
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/071—Branched chain compounds
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/02—Pour-point; Viscosity index
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/25—Internal-combustion engines
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/25—Internal-combustion engines
- C10N2040/255—Gasoline engines
Definitions
- the present invention relates to lubricating oil compositions.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a lubricating oil composition that is excellent in the effect of reducing the coefficient of friction even when lubricating a member with small surface roughness in a low oil temperature range.
- [1] Contains a mineral base oil (A), a polymer (B) having a weight average molecular weight (Mw) of 100 to 15,000, and a molybdenum friction modifier (M), and has a kinematic viscosity of 35 at 40°C. .0 mm 2 /s or less.
- a lubricating oil composition that is excellent in the effect of reducing the coefficient of friction even when lubricating members with small surface roughness in a low oil temperature range.
- the lubricating oil composition of the present embodiment contains a mineral base oil (A), a polymer (B) having a weight average molecular weight (Mw) of 100 to 15,000, and a molybdenum friction modifier (M), It has a kinematic viscosity of 35.0 mm 2 /s or less at 40°C.
- the lubricating oil composition of this embodiment contains a mineral base oil (A).
- a mineral base oil (A) one or more selected from mineral oils conventionally used as base oils for lubricating oils can be used without particular limitation.
- mineral oil examples include atmospheric residual oil obtained by atmospheric distillation of crude oil such as paraffinic crude oil, intermediate crude oil, and naphthenic crude oil; lubricating oil distillate obtained by vacuum distillation of the atmospheric residual oil. ; The lubricating oil fraction is subjected to one or more refining treatments such as solvent deasphalting, solvent extraction, hydrofinishing, hydrocracking, advanced hydrocracking, solvent dewaxing, catalytic dewaxing, hydroisomerization dewaxing, etc. and mineral oil obtained by applying.
- refining treatments such as solvent deasphalting, solvent extraction, hydrofinishing, hydrocracking, advanced hydrocracking, solvent dewaxing, catalytic dewaxing, hydroisomerization dewaxing, etc. and mineral oil obtained by applying.
- the mineral base oil (A) used in the present embodiment is preferably a base oil classified into Group II or III of the API (American Petroleum Institute) base oil category, more preferably a base oil classified into Group III.
- mineral base oil (A) one kind selected from mineral oils may be used alone, or two or more kinds may be used in combination.
- the kinematic viscosity and viscosity index of the mineral base oil (A) are such that the upper limit value is from the viewpoint of improving fuel efficiency, and the lower limit value is to reduce loss of the lubricating oil composition due to evaporation and ensure oil film retention. From the viewpoint of doing so, the following range is preferable.
- the 40° C. kinematic viscosity of the mineral base oil (A) is preferably 4.0 mm 2 /s or higher, more preferably 8.0 mm 2 /s or higher, and still more preferably 12.0 mm 2 /s or higher.
- 0 mm 2 /s or less is preferable, 35.0 mm 2 /s or less is more preferable, and 24.0 mm 2 /s or less is even more preferable.
- the upper limit and lower limit of these numerical ranges can be combined arbitrarily, and specifically, 4.0 mm 2 /s to 50.0 mm 2 /s is preferable, and 8.0 mm 2 /s to 35.0 mm 2 /s is more preferred, and 12.0 mm 2 /s to 24.0 mm 2 /s is even more preferred.
- kinematic viscosity of the mineral base oil (A) is preferably 2.0 mm 2 /s or more, preferably 20.0 mm 2 /s or less, more preferably 10.0 mm 2 /s or less, and 8.0 mm 2 /s or less is more preferable, and 7.0 mm 2 /s is even more preferable.
- the upper limit and lower limit of these numerical ranges can be arbitrarily combined, and specifically, 2.0 mm 2 /s to 20.0 mm 2 /s is preferable, and 2.0 mm 2 /s to 10.0 mm 2 /s, more preferably 2.0 mm 2 /s to 8.0 mm 2 /s, even more preferably 2.0 mm 2 /s to 7.0 mm 2 /s.
- the viscosity index of the base oil (A) is preferably 80 or higher, more preferably 90 or higher, even more preferably 100 or higher, even more preferably 105 or higher, and even more preferably 120 or higher.
- the 40° C. kinematic viscosity, the 100° C. kinematic viscosity, and the viscosity index can be measured or calculated according to JIS K 2283:2000.
- the mineral base oil (A) is a mixed base oil containing two or more mineral base oils
- the kinematic viscosity and viscosity index of the mixed base oil are preferably within the above ranges.
- the content of the mineral base oil (A) is not particularly limited, but from the viewpoint of making it easier to exhibit the effects of the present invention, the total amount of the lubricating oil composition (100% by mass ), preferably 60% to 99% by mass, more preferably 70% to 95% by mass, and still more preferably 80% to 93% by mass.
- the polymer (B) used in the lubricating oil composition of this embodiment should have a weight average molecular weight (Mw) of 100 to 15,000. If the weight-average molecular weight (Mw) of the polymer is less than 100, the effect of enhancing the oil film will not be exhibited. Friction coefficient reduction effect does not appear.
- the weight average molecular weight (Mw) of the polymer (B) is preferably 500 or more, more preferably 800 or more, still more preferably 1,000 or more, and preferably 13,000 or less, more preferably 12,000 or less. , more preferably 11,000 or less, particularly preferably 3,500 or less.
- the upper and lower limits of these numerical ranges can be arbitrarily combined, specifically preferably 500 to 13,000, more preferably 800 to 12,000, still more preferably 1,000 to 11,000 , particularly preferably 1,000 to 3,500.
- the number average molecular weight (Mn) of the polymer (B) is preferably 100 or more, more preferably 500 or more, still more preferably 700 or more, particularly preferably 800 or more, and preferably 10,000 or less, and more preferably 10,000 or more. It is preferably 5,000 or less, more preferably 3,000 or less, and particularly preferably 1,700 or less.
- the upper and lower limits of these numerical ranges can be arbitrarily combined, specifically preferably 100 to 10,000, more preferably 500 to 5,000, still more preferably 700 to 3,000, especially Preferably it is 800 to 1,700.
- the molecular weight distribution (Mw/Mn) of the polymer (B) is preferably 3.0 or less, more preferably 2.5 or less, still more preferably 2.0 or less.
- the weight average molecular weight (Mw) and number average molecular weight (Mn) of each component are values converted to standard polystyrene measured by gel permeation chromatography (GPC).
- polystyrene resin examples include polyolefins, ethylene-vinyl acetate copolymers, condensates of chlorinated paraffin and naphthalene, condensates of chlorinated paraffin and phenol, poly(meth)acrylates, polyalkylstyrenes, and the like. be done.
- polystyrene resin examples include polyolefins, ethylene-vinyl acetate copolymers, condensates of chlorinated paraffin and naphthalene, condensates of chlorinated paraffin and phenol, poly(meth)acrylates, polyalkylstyrenes, and the like. be done.
- the polyolefin (B-1) is preferably an olefin polymer having 2 or more carbon atoms, more specifically an ethylene-propylene copolymer or an olefin polymer having 4 or more carbon atoms.
- Polymers of olefins having 20 or less carbon atoms are preferable, and polymers of olefins having 12 or less carbon atoms are more preferable.
- the upper and lower limits of these numerical ranges can be combined arbitrarily, and as the olefin polymer having 4 or more carbon atoms, specifically, an olefin polymer having 4 to 20 carbon atoms is preferable. Polymers of olefins of numbers 4 to 12 are more preferred.
- olefins include ethylene, propylene, 1-butene, 2-butene, isobutene, 3-methyl-1-butene, 4-phenyl-1-butene, 1-pentene, 3-methyl-1-pentene, 4-methyl-1-pentene, 3,3-dimethyl-1-pentene, 3,4-dimethyl-1-pentene, 4,4-dimethyl-1-pentene, 1-hexene, 4-methyl-1-hexene, 5-methyl-1-hexene, 6-phenyl-1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1- Nonadecene, 1-eicosene and the like can be mentioned. Among these, 1-butene and 1-decene are preferred.
- polyolefin (B-1) may be a hydrogenated product.
- the content of the polymer (B) is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, and still more preferably 0.3% by mass or more in terms of solid content based on the total amount of the composition. Also, it is preferably 5.0% by mass or less, more preferably 4.0% by mass or less, and still more preferably 3.0% by mass or less. The upper and lower limits of these numerical ranges can be arbitrarily combined. is 0.3 to 3.0% by mass.
- the lubricating oil composition of this embodiment further contains a molybdenum-based friction modifier (M). If the lubricating oil composition does not contain the molybdenum-based friction modifier (M), the friction reducing action will be insufficient.
- molybdenum-based friction modifier any compound having a molybdenum atom can be used.
- molybdenum-based friction modifiers (M) include molybdenum dithiocarbamate (MoDTC), molybdenum dithiophosphate (MoDTP), and molybdenum amine complexes. These may be used individually by 1 type, and may be used in combination of 2 or more type. Among these, one or more selected from the group consisting of molybdenum dithiocarbamate (MoDTC) and molybdenum amine complexes are preferable from the viewpoint of reducing the coefficient of friction between metals and obtaining excellent fuel efficiency.
- MoDTC molybdenum dithiocarbamate
- MoDTP molybdenum dithiophosphate
- molybdenum amine complexes molybdenum amine complexes.
- Molybdenum dithiocarbamate includes, for example, binuclear molybdenum dithiocarbamate containing two molybdenum atoms in one molecule, and trinuclear molybdenum dithiocarbamate containing three molybdenum atoms in one molecule.
- the molybdenum-based friction modifier (M) preferably contains one or more selected from the group consisting of dinuclear molybdenum dithiocarbamate, trinuclear molybdenum dithiocarbamate, and molybdenum amine complexes. , more preferably two or more. These molybdenum-based friction modifiers are described in detail below.
- dinuclear molybdenum dithiocarbamate examples include compounds represented by the following general formula (1) and compounds represented by the following general formula (2).
- R 11 to R 14 each independently represent a hydrocarbon group, and they may be the same or different.
- X 11 to X 18 each independently represent an oxygen atom or a sulfur atom, and may be the same or different. However, at least two of X 11 to X 18 in formula (1) are sulfur atoms.
- the number of carbon atoms in the hydrocarbon group that can be selected as R 11 to R 14 is preferably 6 to 22.
- the hydrocarbon groups that can be selected as R 11 to R 14 in the general formulas (1) and (2) include, for example, an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, an alkylaryl group, and an arylalkyl and the like.
- alkyl group include hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group and the like.
- alkenyl group examples include hexenyl group, heptenyl group, octenyl group, nonenyl group, decenyl group, undecenyl group, dodecenyl group, tridecenyl group, tetradecenyl group, pentadecenyl group and the like.
- cycloalkyl group examples include cyclohexyl group, dimethylcyclohexyl group, ethylcyclohexyl group, methylcyclohexylmethyl group, cyclohexylethyl group, propylcyclohexyl group, butylcyclohexyl group, heptylcyclohexyl group and the like.
- aryl group examples include phenyl group, naphthyl group, anthracenyl group, biphenyl group, terphenyl group and the like.
- alkylaryl group examples include tolyl group, dimethylphenyl group, butylphenyl group, nonylphenyl group, dimethylnaphthyl group and the like.
- arylalkyl group examples include a methylbenzyl group, a phenylmethyl group, a phenylethyl group, a diphenylmethyl group and the like.
- molybdenum dialkyldithiocarbamate (M1) represented by the following general formula (m1) (hereinafter also referred to as “compound (M1)”) is preferable.
- each of R 1 , R 2 , R 3 and R 4 is independently a short-chain substituent group ( ⁇ ) which is an aliphatic hydrocarbon group having 4 to 12 carbon atoms or A long-chain substituent group ( ⁇ ), which is an aliphatic hydrocarbon group of 13-22, is shown.
- the molar ratio [( ⁇ )/( ⁇ )] between the short-chain substituent group ( ⁇ ) and the long-chain substituent group ( ⁇ ) in the entire molecule of the compound (M1) is 0.10 to 2.0.
- X 1 , X 2 , X 3 and X 4 each independently represent an oxygen atom or a sulfur atom.
- Examples of aliphatic hydrocarbon groups having 4 to 12 carbon atoms that can be selected as the short-chain substituent group ( ⁇ ) include alkyl groups having 4 to 12 carbon atoms and alkenyl groups having 4 to 12 carbon atoms. Specifically, for example, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, butenyl group, pentenyl group, hexenyl group, heptenyl group, octenyl group, nonenyl group, decenyl group, undecenyl group and dodecenyl group.
- the number of carbon atoms in the aliphatic hydrocarbon group that can be selected as the short-chain substituent group ( ⁇ ) is preferably 5 to 11, more preferably 6 to 10, from the viewpoint of making it easier to exhibit the effects of the present invention. , more preferably 7-9.
- Examples of aliphatic hydrocarbon groups having 13 to 22 carbon atoms that can be selected as the long-chain substituent group ( ⁇ ) include alkyl groups having 13 to 22 carbon atoms and alkenyl groups having 13 to 22 carbon atoms. Specifically, for example, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, heneicosyl group, docosyl group, tridecenyl group, tetradecenyl group, pentadecenyl group, hexadecenyl group, heptadecenyl group, octadecenyl group, oleyl group, nonadecenyl group, icosenyl group, henicosenyl group and docosenyl group.
- the number of carbon atoms in the aliphatic hydrocarbon group that can be selected as the long-chain substituent group ( ⁇ ) is preferably 13 to 20, more preferably 13 to 16, from the viewpoint of making it easier to exhibit the effects of the present invention. , more preferably 13-14.
- the compound (M1) represented by the general formula (m1) has a molar ratio [( ⁇ )/ ( ⁇ )] is 0.10 to 2.0.
- the molar ratio [( ⁇ )/( ⁇ )] is 0.10 or more, the effect of the compound (M1) on copper corrosion resistance is reduced, and the friction reducing action is likely to be improved.
- the molar ratio [( ⁇ )/( ⁇ )] is 2.0 or less, it becomes easier to ensure low-temperature storage stability.
- the molar ratio [( ⁇ )/( ⁇ )] is preferably 0.15 or more, more preferably 0.15 or more, from the viewpoint of reducing the effect on copper corrosion resistance and facilitating the improvement of the friction-reducing effect. is greater than or equal to 0.20.
- the molar ratio [( ⁇ )/( ⁇ )] is preferably 1.2 or less, more preferably 1.0 or less, and still more preferably 0.80 or less. , and more preferably 0.60 or less.
- the upper and lower limits of these numerical ranges can be combined arbitrarily. Specifically, it is preferably 0.15 to 1.2, more preferably 0.20 to 1.0, still more preferably 0.20 to 0.80, and even more preferably 0.20 to 0.60. .
- the short-chain substituent group ( ⁇ ) and the long-chain substituent group ( ⁇ ) may coexist in the same molecule or may not coexist in the same molecule. That is, the molar ratio of the short-chain substituent group ( ⁇ ) and the long-chain substituent group ( ⁇ ) in all molecules of the compound (M1) represented by the general formula (m1) [( ⁇ )/( ⁇ ) ] should be in the range of 0.10 to 2.0. Therefore, the compound (M1) includes a molecular group (m1-1) in which all of R 1 , R 2 , R 3 and R 4 are the short-chain substituent group ( ⁇ ) in the general formula (m1).
- a molecular group (m1-2) in which R 1 , R 2 , R 3 and R 4 are all long-chain substituent groups ( ⁇ ) may be mixed, and R 1 , R 2 , R A molecular group (m1-3) in which a part of 3 and R4 is a short-chain substituent group ( ⁇ ) and the remainder is a long-chain substituent group ( ⁇ ) may be mixed.
- Trinuclear molybdenum dithiocarbamate examples include compounds represented by the following general formula (3). Mo3SkEmLnApQz ( 3 ) _ _ _
- k is an integer of 1 or more
- m is an integer of 0 or more
- k+m is an integer of 4 to 10, preferably an integer of 4 to 7.
- n is an integer of 1 to 4
- p is an integer of 0 or more.
- z is an integer from 0 to 5, including non-stoichiometric values.
- Each E is independently an oxygen atom or a selenium atom, and can, for example, substitute for sulfur in the core described later.
- Each L is independently an anionic ligand having an organic group containing a carbon atom, the total number of carbon atoms of the organic group in each ligand is 14 or more, and each ligand may be the same or , can be different.
- Each A is independently an anion other than L.
- Each Q is independently an electron donating neutral compound and is present to fill an empty coordination on the trinuclear molybdenum compound.
- the total number of carbon atoms of the organic groups in the anionic ligand represented by L is preferably 14-50, more preferably 16-30, still more preferably 18-24.
- L is preferably a monoanionic ligand that is a monovalent anionic ligand, and more preferably a ligand represented by the following general formulas (i) to (iv).
- the anionic ligand selected as L is preferably a ligand represented by general formula (iv) below.
- all the anionic ligands selected as L are preferably the same, and more preferably all are ligands represented by general formula (iv) below.
- X 31 to X 37 and Y each independently represent an oxygen atom or a sulfur atom, and may be the same or different.
- R 31 to R 35 each independently represent an organic group and may be the same or different.
- the number of carbon atoms in each organic group that can be selected as R 31 , R 32 and R 33 is preferably 14-50, more preferably 16-30, still more preferably 18-24.
- the total carbon number of the two organic groups that can be selected as R 34 and R 35 in formula (iv) is preferably 14 to 50, more preferably 16 to 30, still more preferably 18 to 24. .
- Each organic group that can be selected as R 34 and R 35 preferably has 7 to 30 carbon atoms, more preferably 7 to 20 carbon atoms, and still more preferably 8 to 13 carbon atoms.
- the organic group for R 34 and the organic group for R 35 may be the same or different, but are preferably different.
- the number of carbon atoms in the organic group of R 34 and the number of carbon atoms in the organic group of R 35 may be the same or different, but are preferably different.
- Organic groups selected for R 31 -R 35 include hydrocarbyl groups such as alkyl groups, aryl groups, substituted aryl groups and ether groups. It should be noted that the term "hydrocarbyl” refers to a substituent having a carbon atom directly attached to the remainder of the ligand and within the scope of this embodiment is predominantly hydrocarbyl in character. Such substituents include the following. 1. Hydrocarbon Substituents Hydrocarbon substituents include aliphatic substituents such as alkyl and alkenyl, alicyclic substituents such as cycloalkyl and cycloalkenyl, aromatic groups, aliphatic groups and alicyclic groups.
- Substituted Hydrocarbon substituents include those in which the above hydrocarbon substituents are replaced with non-hydrocarbon groups that do not alter the properties of the hydrocarbyl.
- non-hydrocarbon groups include halogen groups such as chloro and fluoro, amino groups, alkoxy groups, mercapto groups, alkylmercapto groups, nitro groups, nitroso groups, sulfoxy groups, and the like.
- the anionic ligand selected as L is preferably derived from an alkylxanthate, a carboxylate, a dialkyldithiocarbamate, or a mixture thereof, and is derived from a dialkyldithiocarbamate. is more preferred.
- the anion that can be selected as A may be a monovalent anion or a divalent anion.
- Anions that may be selected as A include, for example, disulfides, hydroxides, alkoxides, amides and thiocyanates or derivatives thereof.
- Q includes water, amine, alcohol, ether, phosphine, and the like. Q may be the same or different, but are preferably the same.
- k is an integer of 4 to 7
- n is 1 or 2
- L is a monoanionic ligand
- p is the anionic charge at A.
- Preferred are compounds in which each of m and z is 0, k is an integer from 4 to 7, L is a monoanionic ligand, and n is 4. and each of p, m and z is 0 are more preferred.
- the trinuclear molybdenum dithiocarbamate is preferably a compound having a core represented by the following formula (IV-A) or (IV-B), for example.
- Each core has a net electrical charge of +4.
- These cores are surrounded by anionic ligands and, optionally, anions other than the anionic ligands.
- Trinuclear molybdenum-sulfur compounds require the selection of appropriate anionic ligands (L) and other anions (A) depending, for example, on the number of sulfur and E atoms present in the core. ie the total anionic charge made up of the sulfur atom, the E atom if present, L and A if present must be -4.
- Trinuclear molybdenum-sulfur compounds may also contain cations other than molybdenum, such as (alkyl)ammonium, amines or sodium, when the anionic charge is greater than -4.
- a preferred embodiment of an anionic ligand (L) and another anion (A) is a configuration with four monoanionic ligands.
- a molybdenum-sulfur core such as the structures represented by (IV-A) and (IV-B) above, may bind to one or more polydentate ligands, i.e. molybdenum atoms, to form oligomers.
- polydentate ligands i.e. molybdenum atoms
- oligomers may be interconnected by ligands having more than one functional group capable of
- molybdenum-amine complexes examples include molybdenum-amine complexes obtained by reacting molybdenum trioxide and/or molybdic acid, which are hexavalent molybdenum compounds, with an amine compound.
- Preferred amine compounds include alkylamines and dialkylamines.
- the alkylamine and dialkylamine to be reacted with the hexavalent molybdenum compound are not particularly limited, and examples thereof include alkylamines and dialkylamines having an alkyl group having 1 to 30 carbon atoms.
- the content of the molybdenum-based friction modifier (M) is preferably based on the total amount of the lubricating oil composition, from the viewpoint of reducing the coefficient of friction between metals and obtaining excellent fuel efficiency. is 0.30% by mass or more, more preferably 0.40% by mass or more, still more preferably 0.50% by mass or more, and preferably 3.0% by mass or less, more preferably 2.0% by mass or less , more preferably 1.0% by mass or less.
- the upper and lower limits of these numerical ranges can be combined arbitrarily. Specifically, it is preferably 0.30% by mass to 3.0% by mass, more preferably 0.40% by mass to 2.0% by mass, and still more preferably 0.50% by mass to 1.0% by mass. .
- the content of molybdenum atoms derived from the molybdenum-based friction modifier (M) is based on the total amount (100% by mass) of the lubricating oil composition from the viewpoint of improving the friction reducing action.
- M molybdenum-based friction modifier
- the upper and lower limits of these numerical ranges can be arbitrarily combined, specifically, preferably 50 to 2,000 ppm by mass, more preferably 80 to 1,500 ppm by mass, still more preferably 100 to 1 ,000 mass ppm.
- the content ratio of the dinuclear molybdenum dithiocarbamate and the molybdenum amine complex is preferably 0.1 in mass ratio from the viewpoint of improving the friction reducing effect. ⁇ 10, more preferably 1.5 to 8.0, still more preferably 3.0 to 7.0.
- the lubricating oil composition of the present embodiment may contain other components other than the components described above, if necessary, within a range that does not impair the effects of the present invention.
- Additives as other components include, for example, metallic detergents, pour point depressants, antioxidants, antiwear agents, friction modifiers other than the molybdenum friction modifier (M), and extreme pressure agents. , viscosity index improvers, rust inhibitors, defoaming agents, oiliness improvers, metal deactivators, demulsifiers, and the like. These may be used individually by 1 type, and may be used in combination of 2 or more type.
- metal-based detergents include organic acid metal salt compounds containing metal atoms selected from alkali metals and alkaline earth metals, and specifically, metal atoms selected from alkali metals and alkaline earth metals. containing metal salicylates, metal phenates, and metal sulfonates.
- alkali metal refers to lithium, sodium, potassium, rubidium and cesium.
- alkaline earth metal refers to beryllium, magnesium, calcium, strontium, and barium.
- the metal atom contained in the metallic detergent is preferably sodium, calcium, magnesium, or barium, more preferably calcium or magnesium, from the viewpoint of improving detergency at high temperatures.
- the metal salicylate is preferably a compound represented by the following general formula (4)
- the metal phenate is preferably a compound represented by the following general formula (5)
- the metal sulfonate is preferably a compound represented by the following general formula (6 ) are preferred.
- M is a metal atom selected from alkali metals and alkaline earth metals, preferably sodium, calcium, magnesium or barium, more preferably calcium or magnesium.
- M E is an alkaline earth metal, preferably calcium, magnesium or barium, more preferably calcium or magnesium.
- q is the valence of M and is 1 or 2; R 31 and R 32 are each independently a hydrogen atom or a hydrocarbon group having 1 to 18 carbon atoms.
- S represents a sulfur atom.
- r is an integer of 0 or more, preferably an integer of 0-3.
- Hydrocarbon groups that can be selected as R 31 and R 32 include, for example, alkyl groups having 1 to 18 carbon atoms, alkenyl groups having 1 to 18 carbon atoms, cycloalkyl groups having 3 to 18 ring carbon atoms, and ring carbon atoms. Examples include aryl groups having 6 to 18 carbon atoms, alkylaryl groups having 7 to 18 carbon atoms, arylalkyl groups having 7 to 18 carbon atoms, and the like. These may be used individually by 1 type, and may be used in combination of 2 or more type.
- one or more selected from calcium salicylate, calcium phenate, calcium sulfonate, magnesium salicylate, magnesium phenate, and magnesium sulfonate from the viewpoint of improving high-temperature detergent-dispersibility and solubility in base oil is preferably
- These metallic detergents may be neutral salts, basic salts, overbased salts and mixtures thereof.
- the base number of the metallic detergent is preferably 0 to 600 mgKOH/g.
- the base number of the metallic detergent is preferably 10 to 600 mgKOH/g, more preferably 20 to 500 mgKOH/g.
- the term “base number” refers to 7. of JIS K 2501:2003 “Petroleum products and lubricating oils—neutralization value test method”. Means the base number by the perchloric acid method measured in accordance with.
- the content of the metallic detergent is preferably 0.5% based on the total amount (100% by mass) of the lubricating oil composition, from the viewpoint of making it easier to exhibit the effects of the present invention. 01% by mass to 10% by mass, more preferably 0.1% by mass to 5.0% by mass, still more preferably 0.2% by mass to 3.0% by mass, still more preferably 0.3% by mass to 2.0% by mass. It is 0% by mass.
- a metallic detergent may be used independently and may use 2 or more types together. The preferred total content when using two or more types is also the same as the content described above.
- the content of the calcium atom derived from the metallic detergent is Based on the total amount (100% by mass) of the oil composition, it is preferably 0.05% by mass or more, more preferably 0.10% by mass or more, and still more preferably 0.11% by mass or more.
- the content of calcium atoms derived from the metallic detergent is preferably based on the total amount (100% by mass) of the lubricating oil composition from the viewpoint of reducing the sulfated ash content and preventing LSPI (abnormal combustion).
- 0.10% by mass or less is 0.50% by mass or less, more preferably 0.40% by mass or less, still more preferably 0.30% by mass or less, even more preferably 0.20% by mass or less, still more preferably 0.15% by mass or less, More preferably, it is 0.13% by mass or less.
- the content of magnesium atoms derived from the metallic detergent is Based on the total amount (100% by mass) of the oil composition, it is preferably 0.02% by mass or more, more preferably 0.03% by mass or more, and still more preferably 0.04% by mass or more.
- the content of magnesium atoms derived from the metallic detergent is preferably based on the total amount (100% by mass) of the lubricating oil composition from the viewpoint of reducing the sulfated ash content and preventing LSPI (abnormal combustion). is 0.07% by mass or less, more preferably 0.06% by mass or less, and still more preferably 0.05% by mass or less.
- pour point depressant examples include ethylene-vinyl acetate copolymers, condensates of chlorinated paraffin and naphthalene, condensates of chlorinated paraffin and phenol, polymethacrylates (PMA; polyalkyl (meth)acrylates etc.), polyvinyl acetate, polybutene, polyalkylstyrene, etc., and polymethacrylates are preferably used.
- the weight average molecular weight (Mw) of these polymers used as pour point depressants is preferably 50,000 to 150,000. These may be used individually by 1 type, and may be used in combination of 2 or more type.
- antioxidants include amine-based antioxidants and phenol-based antioxidants.
- amine-based antioxidants include diphenylamine-based antioxidants such as diphenylamine and alkylated diphenylamine having an alkyl group having 3 to 20 carbon atoms; phenyl- ⁇ -naphthylamine, phenyl- ⁇ -naphthylamine, and 3-20 carbon atoms naphthylamine-based antioxidants such as substituted phenyl- ⁇ -naphthylamine having an alkyl group of , and substituted phenyl- ⁇ -naphthylamine having an alkyl group of 3 to 20 carbon atoms;
- Phenolic antioxidants include, for example, 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol, 2,6-di-tert-butyl-4-ethylphenol, Monophenol antioxidants such as iso
- antiwear agents include zinc-containing compounds such as zinc dialkyldithiophosphate (ZnDTP) and zinc phosphate; disulfides, sulfurized olefins, sulfurized fats and oils, sulfurized esters, thiocarbonates, thiocarbamates, and polysulfides sulfur-containing compounds such as; phosphites, phosphates, phosphonates, and phosphorous-containing compounds such as amine salts or metal salts thereof; Examples include sulfur- and phosphorus-containing antiwear agents such as esters, amine salts or metal salts thereof. Among these, zinc dialkyldithiophosphate (ZnDTP) is preferred.
- ZnDTP zinc dialkyldithiophosphate
- the content of the zinc dithiophosphate is preferably 200 to 5,000 ppm by mass, more preferably 300 to 2,000 ppm by mass, in terms of phosphorus atoms based on the total amount of the composition.
- the lubricating oil composition of the present embodiment may contain friction modifiers other than component (M).
- the component (M) is excellent in effectively exhibiting the friction reducing action in an environment where the temperature of the lubricating oil composition is high, but the lubricating oil composition contains a friction modifier other than the component (M). Therefore, the friction reducing action can be effectively exhibited even in an environment where the temperature of the lubricating oil composition is low.
- friction modifiers other than molybdenum-based friction modifiers include ashless friction modifiers such as aliphatic amines, fatty acid esters, fatty acid amides, fatty acids, fatty alcohols, and aliphatic ethers; , amides, sulfide esters, phosphate esters, phosphites, phosphate ester amine salts and the like. These may be used individually by 1 type, and may be used in combination of 2 or more type.
- the friction modifier other than the component (M) is preferably an aliphatic amine, and among the aliphatic amines, an aliphatic amine having at least one alkyl or alkenyl group having 2 to 30 carbon atoms in the molecule. preferable.
- diethanolamine compounds represented by the following general formula (7) are preferable.
- R 1 is a monovalent aliphatic hydrocarbon group having 12 to 30 carbon atoms.
- the aliphatic hydrocarbon group having 12 to 30 carbon atoms for R 1 includes, for example, a linear or branched alkyl group having 12 to 30 carbon atoms or a linear or branched chain having 12 to 30 carbon atoms.
- Alkenyl groups are preferred. These groups preferably have 12 to 24 carbon atoms, more preferably 16 to 20 carbon atoms.
- linear or branched alkyl groups having 12 to 30 carbon atoms include various dodecyl groups such as n-dodecyl group, isododecyl group, sec-dodecyl group, tert-dodecyl group, and neododecyl group (hereinafter referred to as Functional groups having a predetermined number of carbon atoms, including straight-chain, branched-chain, and isomers thereof, may be abbreviated as "various functional groups”.), various tridecyl groups, various tetradecyl groups, various Pentadecyl group, various hexadecyl groups, various heptadecyl groups, various octadecyl groups, various nonadecyl groups, various icosyl groups, various henicosyl groups, various docosyl groups, various tricosyl groups, various tetracosyl groups, various pentacosyl groups, various dodec
- linear or branched alkenyl groups having 12 to 30 carbon atoms include various dodecenyl groups, various tridecenyl groups, various tetradecenyl groups, various pentadecenyl groups, various hexadecenyl groups, various heptadecenyl groups, various octadecenyl groups, various nonadecenyl groups, various icosenyl groups, various henicosenyl groups, various docosenyl groups, various tricosenyl groups, various tetracocenyl groups, various pentacosenyl groups, various hexacocenyl groups, various heptacosenyl groups, various octacocenyl groups, various nonacosenyl groups, and various triacontinyl groups.
- various hexadecyl groups, various heptadecyl groups, and various octadecyl groups that are alkyl groups having 16 to 18 carbon atoms various hexadecenyl groups that are alkenyl groups having 16 to 18 carbon atoms
- various heptadecenyl groups and various octadecenyl groups are preferred, various hexadecyl groups, various octadecyl groups and various octadecenyl groups are more preferred, n-hexadecyl groups (palmityl groups), n-octadecyl groups (stearyl groups), n-octadecenyl groups (oleyl group) is more preferred.
- Preferred specific compounds of the diethanolamine compound represented by the general formula (7) include stearyldiethanolamine (wherein R 1 is an n-octadecyl group (stearyl group)), oleyldiethanolamine ( In general formula (7), R 1 is an n-octadecenyl group (oleyl group).) and palmityldiethanolamine (In general formula (7), R 1 is an n-hexadecyl group (palmityl group).)
- oleyldiethanolamine is preferred. These may be used individually by 1 type, and may be used in combination of 2 or more type.
- extreme pressure agents include sulfur-based extreme-pressure agents such as sulfides, sulfoxides, sulfones and thiophosphinates, halogen-based extreme-pressure agents such as chlorinated hydrocarbons, and organic metal-based extreme-pressure agents. be done. Further, among the antiwear agents described above, a compound having a function as an extreme pressure agent can also be used. These may be used individually by 1 type, and may be used in combination of 2 or more type.
- -anti-rust- Rust inhibitors include, for example, fatty acids, alkenylsuccinic acid half esters, fatty acid soaps, alkylsulfonates, polyhydric alcohol fatty acid esters, fatty acid amines, paraffin oxide, and alkylpolyoxyethylene ethers. These may be used individually by 1 type, and may be used in combination of 2 or more type.
- antifoaming agents include silicone oils such as dimethylpolysiloxane, fluorosilicone oils, and fluoroalkyl ethers. These may be used individually by 1 type, and may be used in combination of 2 or more type.
- Oiliness improvers include aliphatic saturated or unsaturated monocarboxylic acids such as stearic acid and oleic acid; polymerized fatty acids such as dimer acid and hydrogenated dimer acid; hydroxy fatty acids such as ricinoleic acid and 12-hydroxystearic acid; lauryl alcohol , aliphatic saturated or unsaturated monoalcohols such as oleyl alcohol; aliphatic saturated or unsaturated monoamines such as stearylamine and oleylamine; aliphatic saturated or unsaturated monocarboxylic acid amides such as lauric amide and oleic amide; glycerin, partial esters of polyhydric alcohols such as sorbitol and aliphatic saturated or unsaturated monocarboxylic acids;
- metal deactivators include benzotriazole-based compounds, tolyltriazole-based compounds, thiadiazole-based compounds, imidazole-based compounds, and pyrimidine-based compounds. These may be used individually by 1 type, and may be used in combination of 2 or more type.
- demulsifiers include anionic surfactants such as castor oil sulfates and petroleum sulfonates; cationic surfactants such as quaternary ammonium salts and imidazolines; polyoxyethylene alkyl ethers and polyoxyethylenes.
- Polyalkylene glycol-based nonionic surfactants such as alkylphenyl ethers and polyoxyethylene alkylnaphthyl ethers; polyoxyalkylene polyglycols and their dicarboxylic acid esters; alkylene oxide adducts of alkylphenol-formaldehyde polycondensates; be done. These may be used individually by 1 type, and may be used in combination of 2 or more type.
- the content of the other components described above can be appropriately adjusted within a range that does not impair the effects of the present invention. 0.001% by mass to 15% by mass, preferably 0.005% by mass to 10% by mass, more preferably 0.01% by mass to 7% by mass, and even more preferably 0.03% by mass to 5% by mass.
- the additive as the other component is diluted and dissolved in a part of the mineral base oil (A), taking into account handling properties, solubility in the mineral base oil (A), etc. It may be combined with other ingredients in the form of a diluted solution.
- the above-mentioned content of the additive as the other component means the content in terms of active ingredients (in terms of resin content) excluding diluent oil.
- the 40 ° C kinematic viscosity of the lubricating oil composition of the present embodiment has an upper limit value from the viewpoint of improving fuel efficiency, and a lower limit value reduces loss of the lubricating oil composition due to evaporation, ensuring oil film retention. from the viewpoint of reducing the It is more preferably 45.0 mm 2 /s or less, still more preferably 30.0 mm 2 /s or less.
- the upper and lower limits of these numerical ranges can be arbitrarily combined, and specifically, preferably 5.0 to 65.0 mm 2 /s, more preferably 10.0 to 45.0 mm 2 /s. s, more preferably 15.0 to 30.0 mm 2 /s.
- the 100 ° C. kinematic viscosity of the lubricating oil composition of the present embodiment has an upper limit value from the viewpoint of improving fuel efficiency, and a lower limit value reduces loss of the lubricating oil composition due to evaporation and secures oil film retention. From the viewpoint of It is more preferably 8.2 mm 2 /s or less, still more preferably 7.1 mm 2 /s or less.
- the upper and lower limits of these numerical ranges can be arbitrarily combined, and specifically, preferably 3.0 to 9.3 mm 2 /s, more preferably 3.5 to 8.2 mm 2 /s. s, more preferably 4.0 to 7.1 mm 2 /s.
- the viscosity index of the lubricating oil composition of the present embodiment is preferably 100 or higher, more preferably 110 or higher, even more preferably 120 or higher, and even more preferably 130 or higher. When the viscosity index is within the above range, the change in viscosity due to temperature becomes small.
- the 40° C. kinematic viscosity, the 100° C. kinematic viscosity, and the viscosity index can be measured or calculated according to JIS K 2283:2000.
- the 150° C. HTHS viscosity (HTHS 150 ) of the lubricating oil composition of the present embodiment is preferably 1.5 mPa s or more, more preferably 1.7 mPa s or more, and preferably 3.7 mPa s. s, preferably less than 3.0 mPa ⁇ s.
- the 150° C. HTHS viscosity (HTHS 150 ) of the lubricating oil composition of the present embodiment can be measured at a shear rate of 10 6 /s using a TBS high temperature viscometer (Tapered Bearing Simulator Viscometer) according to ASTM D4683.
- the coefficient of friction when using the lubricating oil composition of the present embodiment can be evaluated using, for example, an SRV tester (manufactured by Optimol). Specifically, it can be evaluated by the method described in Examples described later.
- the lubricating oil composition of the present embodiment preferably has a friction coefficient of 0.097 or less under conditions of an oil temperature of 30° C. and a maximum height roughness (Rz) of the disk surface of less than 0.20 ⁇ m, A value of 0.095 or less is more preferable.
- the lubricating oil composition of this embodiment is excellent in the effect of reducing the coefficient of friction. Therefore, the lubricating oil composition of the present embodiment is preferably used for internal combustion engines, and more preferably used for internal combustion engines of four-wheel vehicles and motorcycles.
- the lubricating oil composition of the present embodiment is preferably used as an engine oil, but since it is excellent in the effect of reducing the coefficient of friction in a low temperature region, an engine for an automobile engine equipped with a hybrid mechanism or an idling stop mechanism More preferably used as an oil.
- the lubricating oil composition of the present embodiment is suitable for use as a lubricating oil composition for internal combustion engines (engine oil for internal combustion engines) used in automobiles and the like, but can also be applied to other uses.
- the inside of the cylinder bore of the engine block is mirror-finished.
- Engine oil for engines It is also suitable as More specifically, the engine using the lubricating oil composition of the present embodiment preferably has a maximum height roughness (Rz) inside the cylinder bore of less than 0.45 ⁇ m, preferably less than 0.30 ⁇ m. More preferably, it is less than 0.20 ⁇ m.
- the maximum height roughness (Rz) can be specifically measured according to JIS B 0601-2001.
- the method for producing the lubricating oil composition according to this embodiment is not particularly limited.
- the method for producing a lubricating oil composition according to the present embodiment has a step of mixing the mineral base oil (A), polymer (B) and molybdenum-based friction modifier (M). If necessary, one or more selected from the above other components may be mixed.
- each component may be blended after adding a diluent oil or the like to form a solution (dispersion). After blending each component, it is preferable to stir and uniformly disperse the components by a known method.
- the engine includes a vehicle engine such as an automobile, but an automobile engine is preferable, and it is preferable that the engine is an automobile engine equipped with a hybrid mechanism or an idling stop mechanism in which the oil temperature tends to decrease. more preferred.
- the maximum height roughness (Rz) of the inner surface of the cylinder bore of the engine block is preferably less than 0.45 ⁇ m, more preferably less than 0.30 ⁇ m. It is preferably less than 0.20 ⁇ m, more preferably less than 0.20 ⁇ m.
- the present invention also provides a method for lubricating an engine using the lubricating oil composition of the present embodiment described above.
- the engine to be lubricated by the lubrication method of this embodiment is the same as the engine provided by the present invention. That is, a preferred aspect of the method for lubricating an engine of the present embodiment is an automobile engine equipped with a hybrid mechanism or an idling stop mechanism using the lubricating oil composition of the present invention described above, wherein the inside of the cylinder bore of the engine block A method of lubricating an engine, wherein the maximum height roughness (Rz) of the surface is preferably less than 0.45 ⁇ m, more preferably less than 0.30 ⁇ m, less than 0.20 ⁇ m.
- [1] Contains a mineral base oil (A), a polymer (B) having a weight average molecular weight (Mw) of 100 to 15,000, and a molybdenum friction modifier (M), and has a kinematic viscosity of 35 at 40°C. .0 mm 2 /s or less.
- Mw weight average molecular weight
- M molybdenum friction modifier
- Molybdenum atom and phosphorus atom contents were measured according to JPI-5S-38-03.
- Examples 1 to 11 and Comparative Examples 1 to 4 The respective components shown below were added in the amounts shown in Table 1 and thoroughly mixed to obtain a lubricating oil composition. Details of each component used in Examples 1 to 11 and Comparative Examples 1 to 4 are as shown below.
- the content in Table 1 is the content in terms of resin content.
- Molybdenum DTC molybdenum dialkyldithiocarbamate represented by the following structural formula (MoDTC, molybdenum atom content: 10.0% by mass)
- R 1 , R 2 , R 3 and R 4 are each independently an isooctyl group (8 carbon atoms: short-chain substituent group) and an isotridecyl group (13 carbon atoms: long-chain substituent group ), and the molar ratio of isooctyl group and isotridecyl group in the whole molecule of molybdenum dialkyldithiocarbamate is 50:50.
- X 1 and X 2 are sulfur atoms, and X 3 and X 4 are oxygen atoms.
- - Molybdenum amine complex (molybdenum atom content: 7.9% by mass)
- Molybdenum trinuclear dithiocarbamate (MoDTC, molybdenum atom content: 10% by mass)
- the content of molybdenum atoms in the lubricating oil composition is a value reflecting the content of molybdenum atoms derived from the molybdenum-based friction modifier (M).
- the content of phosphorus atoms in the lubricating oil composition is a value reflecting the content of phosphorus atoms derived from ZnDTP, which is another additive.
- ⁇ Cylinder AISI52100
- Standard disc AISI52100 (maximum height roughness (Rz): 0.45 to 0.65 ⁇ m)
- Mirror disk AISI52100 (maximum height roughness (Rz): less than 0.20 ⁇ m)
- Frequency 50Hz
- Amplitude 1.5mm
- ⁇ Load 400N
- Temporal 30 to 140°C, rising in increments of 10°C ⁇ Test time: 5 minutes at each temperature
- the lubricating oil compositions of Examples 1 to 11 which satisfy all the configurations of the present invention, have a friction coefficient of 0.098 or less against a mirror disk at an oil temperature of 30 ° C., and are excellent in reducing the friction coefficient. It can be seen that On the other hand, it can be seen that the lubricating oil compositions of Comparative Examples 1-4 have higher coefficients of friction than the lubricating oil compositions of Examples 1-11.
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Abstract
Description
省燃費化するための方法の一つとして、潤滑油組成物を低粘度化することにより粘性抵抗を低減する方法が挙げられるが、単に低粘度化を進めるだけでは摩擦特性に悪影響が生じてしまう。
一方、近年はピストンやシリンダーライナー等のエンジン部材の表面粗さを低減する技術の開発が進んでいる。
本発明は、上記問題点に鑑みてなされたものであって、低油温域において表面粗さが小さい部材を潤滑する場合においても摩擦係数低減効果に優れる潤滑油組成物を提供することを課題とする。
[1] 鉱油基油(A)と、重量平均分子量(Mw)が100~15,000のポリマー(B)と、モリブデン系摩擦調整剤(M)とを含有し、40℃における動粘度が35.0mm2/s以下である潤滑油組成物。
また、本明細書に記載された数値範囲「下限値~上限値」は、特に断りのない限り、下限値以上、上限値以下であることを意味する。
また、本明細書において、実施例の数値は、上限値又は下限値として用いられ得る数値である。
なお、本明細書において、例えば、「(メタ)アクリレート」とは、「アクリレート」及び「メタクリレート」の双方を示す語として用いており、他の類似用語や同様の標記についても、同じである。
本実施形態の潤滑油組成物は、鉱油基油(A)と、重量平均分子量(Mw)が100~15,000のポリマー(B)と、モリブデン系摩擦調整剤(M)とを含有し、40℃における動粘度が35.0mm2/s以下のものである。
そこで、本発明者らが鋭意検討した結果、分子量の小さいポリマーを配合することで、低油温域における金属部材間の摩擦係数を低減し得ることを見出し、本発明を完成するに至った。
本実施形態の潤滑油組成物は、鉱油基油(A)を含有する。鉱油基油(A)としては、従来、潤滑油の基油として用いられている鉱油から選択される1種以上を、特に制限なく使用することができる。
前記鉱油基油(A)の40℃動粘度は、4.0mm2/s以上が好ましく、8.0mm2/s以上がより好ましく、12.0mm2/s以上がさらに好ましく、また、50.0mm2/s以下が好ましく、35.0mm2/s以下がより好ましく、24.0mm2/s以下が更に好ましい。これらの数値範囲の上限値及び下限値は任意に組み合わせることができ、具体的には、4.0mm2/s~50.0mm2/sが好ましく、8.0mm2/s~35.0mm2/sがより好ましく、12.0mm2/s~24.0mm2/sが更に好ましい。
前記鉱油基油(A)の100℃動粘度は、2.0mm2/s以上が好ましく、また、20.0mm2/s以下が好ましく、10.0mm2/s以下がより好ましく、8.0mm2/s以下が更に好ましく、7.0mm2/sがより更に好ましい。これらの数値範囲の上限値及び下限値は任意に組み合わせることができ、具体的には、2.0mm2/s~20.0mm2/sが好ましく、2.0mm2/s~10.0mm2/sがより好ましく、2.0mm2/s~8.0mm2/sが更に好ましく、2.0mm2/s~7.0mm2/sがより更に好ましい。
前記基油(A)の粘度指数は、80以上が好ましく、90以上がより好ましく、100以上が更に好ましく、105以上がより更に好ましく、120以上が更になお好ましい。
前記40℃動粘度、前記100℃動粘度、及び前記粘度指数は、JIS K 2283:2000に準拠して測定又は算出することができる。
また、前記鉱油基油(A)が2種以上の鉱油基油を含有する混合基油である場合、混合基油の動粘度及び粘度指数が上記範囲内にあることが好ましい。
本実施形態の潤滑油組成物に用いられるポリマー(B)は、重量平均分子量(Mw)が100~15,000のものであることを要する。ポリマーの重量平均分子量(Mw)が100未満であると、油膜増強効果が発現せず、一方、15,000超であるとポリマーが摺動面に入り込めないため、いずれの場合であっても摩擦係数低減効果が発現しない。ポリマー(B)の重量平均分子量(Mw)は、好ましくは500以上、より好ましくは800以上、更に好ましくは1,000以上であり、また、好ましくは13,000以下、より好ましくは12,000以下、更に好ましくは11,000以下、特に好ましくは3,500以下である。これらの数値範囲の上限値及び下限値は任意に組み合わせることができ、具体的には、好ましくは500~13,000、より好ましくは800~12,000、更に好ましくは1,000~11,000、特に好ましくは1,000~3,500である。
また、ポリマー(B)の数平均分子量(Mn)は、好ましくは100以上、より好ましくは500以上、更に好ましくは700以上、特に好ましくは800以上であり、また、好ましくは10,000以下、より好ましくは5,000以下、更に好ましくは3,000以下、特に好ましくは1,700以下である。これらの数値範囲の上限値及び下限値は任意に組み合わせることができ、具体的には、好ましくは100~10,000、より好ましくは500~5,000、更に好ましくは700~3,000、特に好ましくは800~1,700である。
尚、本明細書において、各成分の重量平均分子量(Mw)及び数平均分子量(Mn)は、ゲルパーミエーションクロマトグラフィー(GPC)法で測定される標準ポリスチレン換算の値である。
上記ポリマー(B)としては、ポリオレフィン(B-1)やポリ(メタ)アクリレート(B-2)を用いることが好ましい。
上記オレフィンの具体例としては、エチレン、プロピレン、1-ブテン、2-ブテン、イソブテン、3-メチル-1-ブテン、4-フェニル-1-ブテン、1-ペンテン、3-メチル-1-ペンテン、4-メチル-1-ペンテン、3,3-ジメチル-1-ペンテン、3,4-ジメチル-1-ペンテン、4,4-ジメチル-1-ペンテン、1-ヘキセン、4-メチル-1-ヘキセン、5-メチル-1-ヘキセン、6-フェニル-1-ヘキセン、1-オクテン、1-デセン、1-ドデセン、1-テトラデセン、1-ペンタデセン、1-ヘキサデセン、1-ヘプタデセン、1-オクタデセン、1-ノナデセン、1-エイコセンなどを挙げることができる。これらの中で1-ブテンや1-デセンが好ましい。
本実施形態の潤滑油組成物は、さらにモリブデン系摩擦調整剤(M)を含有する。潤滑油組成物がモリブデン系摩擦調整剤(M)を含有しない場合、摩擦低減作用が不十分となる。
モリブデン系摩擦調整剤(M)を例示すると、ジチオカルバミン酸モリブデン(MoDTC)、ジチオリン酸モリブデン(MoDTP)、及びモリブデンアミン錯体が挙げられる。これらは、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
これらの中でも、金属間摩擦係数を下げて優れた省燃費性を得る観点から、ジチオカルバミン酸モリブデン(MoDTC)及びモリブデンアミン錯体からなる群から選択される1種以上が好ましい。
ジチオカルバミン酸モリブデン(MoDTC)は、としては、例えば、一分子中に2つのモリブデン原子を含む二核のジチオカルバミン酸モリブデン、一分子中に3つのモリブデン原子を含む三核のジチオカルバミン酸モリブデンが挙げられる。
以下、これらのモリブデン系摩擦調整剤について、詳細に説明する。
二核のジチオカルバミン酸モリブデンとしては、例えば、下記一般式(1)で表される化合物、下記一般式(2)で表される化合物が挙げられる。
X11~X18は、それぞれ独立に、酸素原子又は硫黄原子を示し、互いに同一であってもよく、異なっていてもよい。ただし、式(1)中のX11~X18の少なくとも二つは硫黄原子である。
R11~R14として選択し得る炭化水素基の炭素数は、6~22が好ましい。
当該アルキル基としては、例えば、ヘキシル基、ヘプチル基、オクチル基、ノニル基、デシル基、ウンデシル基、ドデシル基、トリデシル基、テトラデシル基、ペンタデシル基、ヘキサデシル基、ヘプタデシル基、オクタデシル基等が挙げられる。
当該アルケニル基としては、例えば、ヘキセニル基、ヘプテニル基、オクテニル基、ノネニル基、デセニル基、ウンデセニル基、ドデセニル基、トリデセニル基、テトラデセニル基、ペンタデセニル基等が挙げられる。
当該シクロアルキル基としては、例えば、シクロヘキシル基、ジメチルシクロヘキシル基、エチルシクロヘキシル基、メチルシクロヘキシルメチル基、シクロヘキシルエチル基、プロピルシクロヘキシル基、ブチルシクロヘキシル基、ヘプチルシクロヘキシル基等が挙げられる。
当該アリール基としては、例えば、フェニル基、ナフチル基、アントラセニル基、ビフェニル基、ターフェニル基等が挙げられる。
当該アルキルアリール基としては、例えば、トリル基、ジメチルフェニル基、ブチルフェニル基、ノニルフェニル基、ジメチルナフチル基等が挙げられる。
当該アリールアルキル基としては、例えば、メチルベンジル基、フェニルメチル基、フェニルエチル基、ジフェニルメチル基等が挙げられる。
具体的には、例えば、ブチル基、ペンチル基、ヘキシル基、ヘプチル基、オクチル基、ノニル基、デシル基、ウンデシル基、ドデシル基、ブテニル基、ペンテニル基、ヘキセニル基、ヘプテニル基、オクテニル基、ノネニル基、デセニル基、ウンデセニル基、ドデセニル基が挙げられる。これらは、直鎖状であってもよく、分岐鎖状であってもよい。
なお、短鎖置換基群(α)として選択し得る、脂肪族炭化水素基の炭素数は、本発明の効果をより発揮させやすくする観点から、好ましくは5~11、より好ましくは6~10、更に好ましくは7~9である。
具体的には、例えば、トリデシル基、テトラデシル基、ペンタデシル基、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、トリデセニル基、テトラデセニル基、ペンタデセニル基、ヘキサデセニル基、ヘプタデセニル基、オクタデセニル基、オレイル基、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、が挙げられる。これらは、直鎖状であってもよく、分岐鎖状であってもよい。
なお、長鎖置換基群(β)として選択し得る、脂肪族炭化水素基の炭素数は、本発明の効果をより発揮させやすくする観点から、好ましくは13~20、より好ましくは13~16、更に好ましくは13~14である。
ここで、耐銅腐食性への影響をより小さくする観点、摩擦低減作用をより向上させやすくする観点から、モル比[(α)/(β)]は、好ましくは0.15以上、より好ましくは0.20以上である。
また、低温貯蔵安定性をより確保しやすくする観点から、モル比[(α)/(β)]は、好ましくは1.2以下、より好ましくは1.0以下、更に好ましくは0.80以下、より更に好ましくは0.60以下である。
これらの数値範囲の上限値及び下限値は任意に組み合わせることができる。具体的には、好ましくは0.15~1.2、より好ましくは0.20~1.0、更に好ましくは0.20~0.80、より更に好ましくは0.20~0.60である。
したがって、化合物(M1)には、前記一般式(m1)中、R1、R2、R3及びR4が全て短鎖置換基群(α)である分子群(m1-1)が混在していてもよく、R1、R2、R3及びR4が全て長鎖置換基群(β)である分子群(m1-2)が混在していてもよく、R1、R2、R3及びR4の一部が短鎖置換基群(α)であり、残部が長鎖置換基群(β)である分子群(m1-3)が混在していてもよい。
三核のジチオカルバミン酸モリブデンとしては、例えば、下記一般式(3)で表される化合物が挙げられる。
Mo3SkEmLnApQz (3)
Eは、それぞれ独立に、酸素原子又はセレン原子であり、例えば、後述するコアにおいて硫黄を置換し得るものである。
Lは、それぞれ独立に、炭素原子を含有する有機基を有するアニオン性リガンドであり、各リガンドにおける該有機基の炭素原子の合計が14個以上であり、各リガンドは同一であってもよいし、異なっていてもよい。
Aは、それぞれ独立に、L以外のアニオンである。
Qは、それぞれ独立に、電子を供与する中性化合物であり、三核モリブデン化合物上における空の配位を満たすために存在する。
Lとしては、1価のアニオン性リガンドであるモノアニオン性リガンドであることが好ましく、具体的には、下記一般式(i)~(iv)で表されるリガンドであることがより好ましい。
なお、前記一般式(3)中、Lとして選択されるアニオン性リガンドとしては、下記一般式(iv)で表されるリガンドであることが好ましい。
また、前記一般式(3)において、Lとして選択されるアニオン性リガンドは、すべて同一であることが好ましく、すべて下記一般式(iv)で表されるリガンドであることがより好ましい。
前記一般式(i)~(iv)中、R31~R35は、それぞれ独立に、有機基であり、互いに同一であってもよく、異なっていてもよい。
R34及びR35として選択し得るそれぞれの有機基の炭素数は、好ましくは7~30個、より好ましくは7~20個、更に好ましくは8~13個である。
なお、R34の有機基と、R35の有機基とは、互いに同一であってもよく、異なっていてもよいが、互いに異なることが好ましい。また、R34の有機基の炭素数と、R35の有機基の炭素数とは、互いに同一であってもよく、異なっていてもよいが、互いに異なることが好ましい。
なお、「ヒドロカルビル」なる用語は、リガンドの残部に直接結合する炭素原子を有する置換基を示し、本実施形態の範囲内において、その特性が主にヒドロカルビルである。かかる置換基は、以下のものが挙げられる。
1.炭化水素置換基
炭化水素置換基としては、アルキル、アルケニル等の脂肪族の置換基、シクロアルキル、シクロアルケニル等の脂環式の置換基、芳香族基、脂肪族基及び脂環式基に置換された芳香核、環がリガンド中のもう一つの箇所を介して完結している環式基(即ち、任意の2つの示された置換基がともに脂環式基を形成してもよい)が挙げられる。
2.置換された炭化水素置換基
置換された炭化水素置換基としては、上記炭化水素置換基をヒドロカルビルの特性を変化させない非炭化水素基で置換したものが挙げられる。非炭化水素基としては、例えば、特にクロロ、フルオロ等のハロゲン基、アミノ基、アルコキシ基、メルカプト基、アルキルメルカプト基、ニトロ基、ニトロソ基、スルホキシ基等が挙げられる。
三核モリブデン-硫黄化合物は、また、アニオン電荷が-4を超える場合、モリブデン以外のカチオン、例えば、(アルキル)アンモニウム、アミン又はナトリウムを含んでいてもよい。アニオン性リガンド(L)及び他のアニオン(A)の好ましい実施形態は、4個のモノアニオン性のリガンドを有する構成である。
モリブデン-硫黄コア、例えば、上記(IV-A)及び(IV-B)で表される構造体は、1又は2以上の多座リガンド、即ち、モリブデン原子に結合して、オリゴマーを形成することが可能な官能基を1つより多く有するリガンドにより相互接続(interconnect)させることができる。
モリブデンアミン錯体としては、例えば、6価のモリブデン化合物である三酸化モリブデン及び/又はモリブデン酸とアミン化合物とを反応させてなるモリブデンアミン錯体等が挙げられる。
アミン化合物としては、好ましくは、アルキルアミン、ジアルキルアミン等が挙げられる。
6価のモリブデン化合物と反応させるアルキルアミン、ジアルキルアミンは特に制限されず、炭素数1~30のアルキル基を有するアルキルアミン、ジアルキルアミンが挙げられる。
本実施形態の潤滑油組成物において、モリブデン系摩擦調整剤(M)の含有量は、金属間摩擦係数を下げて優れた省燃費性を得る観点から、潤滑油組成物の全量基準で、好ましくは0.30質量%以上、より好ましくは0.40質量%以上、更に好ましくは0.50質量%以上であり、また、好ましくは3.0質量%以下、より好ましくは2.0質量%以下、更に好ましくは1.0質量%以下である。
これらの数値範囲の上限値及び下限値は任意に組み合わせることができる。具体的には、好ましくは0.30質量%~3.0質量%、より好ましくは0.40質量%~2.0質量%、更に好ましくは0.50質量%~1.0質量%である。
本実施形態において、二核のジチオカルバミン酸モリブデンとモリブデンアミン錯体との含有比率[(二核MoDTC)/(MoAmn)]は、摩擦低減作用を向上させる観点から、質量比で、好ましくは0.1~10、より好ましくは1.5~8.0、更に好ましくは3.0~7.0である。
本実施形態の潤滑油組成物は、本発明の効果を損なわない範囲で、必要に応じて、上記成分以外のその他の成分を含有してもよい。
前記その他の成分としての添加剤としては、例えば、金属系清浄剤、流動点降下剤、酸化防止剤、耐摩耗剤、モリブデン系摩擦調整剤(M)以外の他の摩擦調整剤、極圧剤、粘度指数向上剤、防錆剤、消泡剤、油性向上剤、金属不活性化剤、抗乳化剤等が挙げられる。
これらは、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
金属系清浄剤としては、例えば、アルカリ金属及びアルカリ土類金属から選ばれる金属原子を含有する有機酸金属塩化合物が挙げられ、具体的には、アルカリ金属及びアルカリ土類金属から選ばれる金属原子を含有する、金属サリシレート、金属フェネート、及び金属スルホネート等が挙げられる。
なお、本明細書において、「アルカリ金属」としては、リチウム、ナトリウム、カリウム、ルビジウム及びセシウムを指す。
また、「アルカリ土類金属」としては、ベリリウム、マグネシウム、カルシウム、ストロンチウム、及びバリウムを指す。
金属系清浄剤に含まれる金属原子としては、高温での清浄性の向上の観点から、ナトリウム、カルシウム、マグネシウム、又はバリウムが好ましく、カルシウム、マグネシウムがより好ましい。
R31及びR32として選択し得る炭化水素基としては、例えば、炭素数1~18のアルキル基、炭素数1~18のアルケニル基、環形成炭素数3~18のシクロアルキル基、環形成炭素数6~18のアリール基、炭素数7~18のアルキルアリール基、炭素数7~18のアリールアルキル基等が挙げられる。
これらは、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。これらの中でも、高温清浄分散性を向上する観点、及び基油への溶解性の観点から、カルシウムサリシレート、カルシウムフェネート、カルシウムスルホネート、マグネシウムサリシレート、マグネシウムフェネート、及びマグネシウムスルホネートから選ばれる1種以上であることが好ましい。
前記金属系清浄剤の塩基価としては、好ましくは0~600mgKOH/gである。
前記金属系清浄剤が塩基性塩又は過塩基性塩である場合には、当該金属系清浄剤の塩基価としては、好ましくは10~600mgKOH/g、より好ましくは20~500mgKOH/gである。
なお、本明細書において、「塩基価」とは、JIS K 2501:2003「石油製品および潤滑油-中和価試験方法」の7.に準拠して測定される過塩素酸法による塩基価を意味する。
なお、金属系清浄剤は、単独で用いてもよく、2種以上を併用してもよい。2種以上用いる場合の好適な合計含有量も、前述した含有量と同じである。
また、前記金属系清浄剤に由来するカルシウム原子の含有量は、硫酸灰分を少なくする観点及びLSPI(異常燃焼)防止の観点から、前記潤滑油組成物の全量(100質量%)基準で、好ましくは0.50質量%以下、より好ましくは0.40質量%以下、更に好ましくは0.30質量%以下、より更に好ましくは0.20質量%以下、更になお好ましくは0.15質量%以下、一層好ましくは0.13質量%以下である。
また、前記金属系清浄剤に由来するマグネシウム原子の含有量は、硫酸灰分を少なくする観点及びLSPI(異常燃焼)防止の観点から、前記潤滑油組成物の全量(100質量%)基準で、好ましくは0.07質量%以下、より好ましくは0.06質量%以下、更に好ましくは0.05質量%以下である。
流動点降下剤としては、例えば、エチレン-酢酸ビニル共重合体、塩素化パラフィンとナフタレンとの縮合物、塩素化パラフィンとフェノールとの縮合物、ポリメタクリレート系(PMA系;ポリアルキル(メタ)アクリレート等)、ポリビニルアセテート、ポリブテン、ポリアルキルスチレン等が挙げられ、ポリメタクリレート系が好ましく用いられる。また、流動点降下剤として用いられるこれらの重合体の重量平均分子量(Mw)としては、好ましくは5万~15万である。
これらは、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
酸化防止剤としては、例えば、アミン系酸化防止剤、フェノール系酸化防止剤等が挙げられる。
アミン系酸化防止剤としては、例えば、ジフェニルアミン、炭素数3~20のアルキル基を有するアルキル化ジフェニルアミン等のジフェニルアミン系酸化防止剤;フェニル-α-ナフチルアミン、フェニル-β-ナフチルアミン、炭素数3~20のアルキル基を有する置換フェニル-α-ナフチルアミン、炭素数3~20のアルキル基を有する置換フェニル-β-ナフチルアミン等のナフチルアミン系酸化防止剤;等が挙げられる。
フェノール系酸化防止剤としては、例えば、2,6-ジ-tert-ブチルフェノール、2,6-ジ-tert-ブチル-4-メチルフェノール、2,6-ジ-tert-ブチル-4-エチルフェノール、イソオクチル-3-(3,5-ジ-tert-ブチル-4-ヒドロキシフェニル)プロピオネート、オクタデシル-3-(3,5-ジ-tert-ブチル-4-ヒドロキシフェニル)プロピオネート等のモノフェノール系酸化防止剤;4,4’-メチレンビス(2,6-ジ-tert-ブチルフェノール)、2,2’-メチレンビス(4-エチル-6-tert-ブチルフェノール)等のジフェノール系酸化防止剤;ヒンダードフェノール系酸化防止剤;等が挙げられる。
これらは、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
耐摩耗剤としては、例えば、ジアルキルジチオリン酸亜鉛(ZnDTP)、リン酸亜鉛等の亜鉛含有化合物;ジスルフィド類、硫化オレフィン類、硫化油脂類、硫化エステル類、チオカーボネート類、チオカーバメート類、ポリサルファイド類等の硫黄含有化合物;亜リン酸エステル類、リン酸エステル類、ホスホン酸エステル類、及びこれらのアミン塩又は金属塩等のリン含有化合物;チオ亜リン酸エステル類、チオリン酸エステル類、チオホスホン酸エステル類、及びこれらのアミン塩又は金属塩等の硫黄及びリン含有耐摩耗剤などが挙げられる。
これらの中でも、ジアルキルジチオリン酸亜鉛(ZnDTP)が好ましい。
これらは、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
上記ジチオリン酸亜鉛の含有量は、組成物全量基準におけるリン原子換算で、好ましくは200~5,000質量ppm、より好ましくは300~2,000質量ppmである。
本実施形態の潤滑油組成物は、成分(M)以外の摩擦調整剤を含んでもよい。
前記成分(M)は、潤滑油組成物の温度が高い環境下において、摩擦低減作用を効果的に発揮させることに優れるが、潤滑油組成物が成分(M)以外の摩擦調整剤を含むことにより、潤滑油組成物の温度が低い環境下においても、摩擦低減作用を効果的に発揮させることができる。
モリブデン系摩擦調整剤(M)以外の摩擦調整剤としては、例えば、脂肪族アミン、脂肪酸エステル、脂肪酸アミド、脂肪酸、脂肪族アルコール、脂肪族エーテル等の無灰系摩擦調整剤;油脂類、アミン、アミド、硫化エステル、リン酸エステル、亜リン酸エステル、リン酸エステルアミン塩等が挙げられる。
これらは、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
ここで、成分(M)以外の摩擦調整剤としては、脂肪族アミンが好ましく、脂肪族アミンの中でも、炭素数2~30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個有する脂肪族アミンが好ましい。
R1の炭素数12~30の脂肪族炭化水素基としては、例えば、炭素数12~30の直鎖状もしくは分岐鎖状のアルキル基又は炭素数12~30の直鎖状もしくは分岐鎖状のアルケニル基が好ましく挙げられる。これらの基の炭素数は、より好ましくは12~24、更に好ましくは16~20である。
また、炭素数12~30の直鎖状又は分岐鎖状のアルケニル基としては、各種ドデセニル基、各種トリデセニル基、各種テトラデセニル基、各種ペンタデセニル基、各種ヘキサデセニル基、各種ヘプタデセニル基、各種オクタデセニル基、各種ノナデセニル基、各種イコセニル基、各種ヘンイコセニル基、各種ドコセニル基、各種トリコセニル基、各種テトラコセニル基、各種ペンタコセニル基、各種ヘキサコセニル基、各種ヘプタコセニル基、各種オクタコセニル基、各種ノナコセニル基、及び各種トリアコンチニル基が挙げられる。
なかでも、ロングドレイン性の向上効果を考慮すると、炭素数16~18のアルキル基である各種ヘキサデシル基、各種ヘプタデシル基、及び各種オクタデシル基、炭素数16~18のアルケニル基である各種ヘキサデセニル基、各種ヘプタデセニル基、及び各種オクタデセニル基が好ましく、各種ヘキサデシル基、各種オクタデシル基、各種オクタデセニル基がより好ましく、n-ヘキサデシル基(パルミチル基)、n-オクタデシル基(ステアリル基)、n-オクタデセニル基(オレイル基)が更に好ましい。
これらは、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
極圧剤としては、例えば、スルフィド類、スルフォキシド類、スルフォン類、チオホスフィネート類等の硫黄系極圧剤、塩素化炭化水素等のハロゲン系極圧剤、有機金属系極圧剤等が挙げられる。また、上述の耐摩耗剤の内、極圧剤としての機能を有する化合物を用いることもできる。
これらは、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
防錆剤としては、例えば、脂肪酸、アルケニルコハク酸ハーフエステル、脂肪酸セッケン、アルキルスルホン酸塩、多価アルコール脂肪酸エステル、脂肪酸アミン、酸化パラフィン、アルキルポリオキシエチレンエーテル等が挙げられる。
これらは、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
消泡剤としては、例えば、ジメチルポリシロキサン等のシリコーン油、フルオロシリコーン油、フルオロアルキルエーテル等が挙げられる。
これらは、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
油性向上剤としては、ステアリン酸、オレイン酸等の脂肪族飽和又は不飽和モノカルボン酸;ダイマー酸、水添ダイマー酸等の重合脂肪酸;リシノレイン酸、12-ヒドロキシステアリン酸等のヒドロキシ脂肪酸;ラウリルアルコール、オレイルアルコール等の脂肪族飽和又は不飽和モノアルコール;ステアリルアミン、オレイルアミン等の脂肪族飽和又は不飽和モノアミン;ラウリン酸アミド、オレイン酸アミド等の脂肪族飽和又は不飽和モノカルボン酸アミド;グリセリン、ソルビトール等の多価アルコールと脂肪族飽和又は不飽和モノカルボン酸との部分エステル;等が挙げられる。
金属不活性化剤としては、例えば、ベンゾトリアゾール系化合物、トリルトリアゾール系化合物、チアジアゾール系化合物、イミダゾール系化合物、ピリミジン系化合物等が挙げられる。
これらは、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
抗乳化剤としては、例えば、ひまし油の硫酸エステル塩、石油スルフォン酸塩等のアニオン性界面活性剤;第四級アンモニウム塩、イミダゾリン類等のカチオン性界面活性剤;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性界面活性剤;ポリオキシアルキレンポリグリコール及びそのジカルボン酸のエステル;アルキルフェノール-ホルムアルデヒド重縮合物のアルキレンオキシド付加物;等が挙げられる。
これらは、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
なお、本明細書において、前記その他の成分としての添加剤は、ハンドリング性、鉱油基油(A)への溶解性等を考慮し、上述の鉱油基油(A)の一部に希釈し溶解させた溶液の形態で、他の成分と配合してもよい。このような場合、本明細書においては、前記その他の成分としての添加剤の上述の含有量は、希釈油を除いた有効成分換算(樹脂分換算)での含有量を意味する。
<40℃動粘度、100℃動粘度、及び粘度指数>
本実施形態の潤滑油組成物の40℃動粘度は、上限値は省燃費性を良好なものとする観点から、下限値は蒸発による潤滑油組成物の損失を低減し、油膜保持性を確保する観点から、好ましくは5.0mm2/s以上、より好ましくは10.0mm2/s以上、更に好ましくは15.0mm2/s以上であり、また、好ましくは65.0mm2/s以下、より好ましくは45.0mm2/s以下、更に好ましくは30.0mm2/s以下である。これらの数値範囲の上限値及び下限値は任意に組み合わせることができ、具体的には、好ましくは5.0~65.0mm2/sであり、より好ましくは10.0~45.0mm2/sであり、さらに好ましくは15.0~30.0mm2/sである。
本実施形態の潤滑油組成物の100℃動粘度は、上限値は省燃費性を良好なものとする観点から、下限値は蒸発による潤滑油組成物の損失を低減し、油膜保持性を確保する観点から、好ましくは3.0mm2/s以上、より好ましくは3.5mm2/s以上、更に好ましくは4.0mm2/s以上であり、また、好ましくは9.3mm2/s以下、より好ましくは8.2mm2/s以下、更に好ましくは7.1mm2/s以下である。これらの数値範囲の上限値及び下限値は任意に組み合わせることができ、具体的には、好ましくは3.0~9.3mm2/sであり、より好ましくは3.5~8.2mm2/sであり、さらに好ましくは4.0~7.1mm2/sである。
本実施形態の潤滑油組成物の粘度指数は、好ましくは100以上、より好ましくは110以上、更に好ましくは120以上、より更に好ましくは130以上である。粘度指数が前記範囲内であると、温度による粘度変化が小さくなる。
前記40℃動粘度、前記100℃動粘度、及び粘度指数は、JIS K 2283:2000に準拠して測定又は算出することができる。
本実施形態の潤滑油組成物の150℃HTHS粘度(HTHS150)は、好ましくは1.5mPa・s以上であり、より好ましくは1.7mPa・s以上であり、また、好ましくは3.7mPa・s未満であり、より好ましくは3.0mPa・s未満である。
本実施形態の潤滑油組成物の150℃HTHS粘度(HTHS150)は、ASTM D4683に準拠し、TBS高温粘度計(Tapered Bearing Simulator Viscometer)を用いて、せん断速度106/sにて測定できる。
本実施形態の潤滑油組成物を用いた際の摩擦係数は、例えば、SRV試験機(Optimol社製)を用いて評価することができる。具体的には、後述する実施例に記載の方法で評価することができる。本実施形態の潤滑油組成物は、油温30℃かつディスク表面の最大高さ粗さ(Rz)が0.20μm未満の条件下における当該摩擦係数が、0.097以下であるものが好ましく、0.095以下であるものがより好ましい。
本実施形態の潤滑油組成物は、摩擦係数低減効果に優れる。
したがって、本実施形態の潤滑油組成物は、内燃機関に用いられることが好ましく、四輪車や自動二輪車の内燃機関に用いられることがより好ましい。
本実施形態の潤滑油組成物は、エンジン油として使用されることが好ましいが、低温領域における摩擦係数の低減効果に優れているため、ハイブリッド機構又はアイドリングストップ機構を搭載した自動車用エンジン用のエンジン油として使用されることがより好ましい。
なお、本実施形態の潤滑油組成物は、自動車等に使用される内燃機関用潤滑油組成物(内燃機関用エンジンオイル)としての用途が好適であるが、他の用途にも適用し得る。
上記最大高さ粗さ(Rz)は、具体的にはJIS B 0601-2001によって測定することができる。
本実施形態にかかる潤滑油組成物の製造方法は、特に制限されない。
例えば、本実施形態にかかる潤滑油組成物の製造方法は、前記鉱油基油(A)、ポリマー(B)及びモリブデン系摩擦調整剤(M)を混合する工程を有する。必要に応じて、さらに前記その他の成分から選択される1種以上を混合してもよい。
本実施形態は、上述の本発明の潤滑油組成物を含むエンジンも提供する。
当該エンジンとしては、上述のとおり、自動車等の車両用エンジン等が挙げられるが、自動車用エンジンが好ましく、油温が低下しやすいハイブリッド機構又はアイドリングストップ機構を搭載した自動車用のエンジンであることがより好ましい。
また、本実施形態のエンジンは、上述した理由により、エンジンブロックのシリンダーボア内部表面の最大高さ粗さ(Rz)が0.45μm未満であることが好ましく、0.30μm未満であることがより好ましく、0.20μm未満であることが更に好ましい。
本発明は、上述の本実施形態の潤滑油組成物を用いて、エンジンを潤滑する、エンジンの潤滑方法も提供する。
本実施態様の潤滑方法により潤滑する対象となるエンジンは、上述の本発明が提供するエンジンと同様である。
すなわち、本実施態様のエンジンの潤滑方法における好適な態様は、上述の本発明の潤滑油組成物を用い、ハイブリッド機構又はアイドリングストップ機構を搭載した自動車のエンジンであって、エンジンブロックのシリンダーボア内部表面の最大高さ粗さ(Rz)が好ましくは0.45μm未満、より好ましくは0.30μm未満、0.20μm未満のエンジンを潤滑する、エンジンの潤滑方法である。
本発明の一態様によれば、下記[1]~[9]が提供される。
[1] 鉱油基油(A)と、重量平均分子量(Mw)が100~15,000のポリマー(B)と、モリブデン系摩擦調整剤(M)とを含有し、40℃における動粘度が35.0mm2/s以下である潤滑油組成物。
[2] 前記ポリマー(B)の含有量が、固形分換算における潤滑油全量基準で0.1~5.0質量%である[1]に記載の潤滑油組成物。
[3] 前記ポリマー(B)が、ポリオレフィン(B-1)である[1]又は[2]に記載の潤滑油組成物。
[4] 前記ポリマー(B)の重量平均分子量(Mw)が1,000~11,000である[1]~[3]のいずれかに記載の潤滑油組成物。
[5] 前記モリブデン系摩擦調整剤(M)が、二核のジチオカルバミン酸モリブデン、三核のジチオカルバミン酸モリブデン、及びモリブデンアミン錯体から選択される2種以上を含む[1]~[4]のいずれかに記載の潤滑油組成物。
[6] 前記モリブデン系摩擦調整剤(M)の含有量が、組成物全量基準におけるモリブデン原子換算で50~2,000質量ppmである[1]~[5]のいずれかに記載の潤滑油組成物。
[7] 表面の最大高さ粗さ(Rz)が0.45μm未満の部材を備えるエンジンに用いられる[1]~[6]のいずれかに記載の潤滑油組成物。
[8] ハイブリッド機構又はアイドリングストップ機構を搭載した自動車用エンジンに用いられる[1]~[7]のいずれかに記載の潤滑油組成物。
[9] [1]~[7]のいずれかに記載の潤滑油組成物を用いて、表面の最大高さ粗さ(Rz)が0.45μm未満の部材を備えるエンジンを潤滑する、エンジンの潤滑方法。
潤滑油組成物の40℃動粘度、100℃動粘度、及び粘度指数を、JIS K 2283:2000に準拠して測定又は算出した。
150℃HTHS粘度を、JPI-5S-36―03に準拠して測定又は算出した。
モリブデン原子及びリン原子の含有量を、JPI-5S-38-03に準拠して測定した。
Waters社製の「1515アイソクラティックHPLCポンプ」、「2414示差屈折率(RI)検出器」に、東ソー社製のカラム「TSKguardcolumn SuperHZ-L」を1本、及び「TSKSuperMultipore HZ-M」を2本、上流側からこの順で取り付け、測定温度:40℃、移動相:テトラヒドロフラン、流速:0.35mL/分、試料濃度1.0mg/mLの条件で測定し、標準ポリスチレン換算にて求めた。
以下に示す各成分を、表1に示す含有量で加えて十分に混合し、潤滑油組成物を得た。
実施例1~11、及び比較例1~4で用いた各成分の詳細は、以下に示すとおりである。
なお、表1中の含有量は、樹脂分換算の含有量である。
・鉱油1(API基油カテゴリーでの分類:グループIII、40℃動粘度:19.8mm2/s、100℃動粘度:4.0mm2/s、粘度指数:125)
・鉱油2(API基油カテゴリーでの分類:グループII、40℃動粘度:406.6mm2/s、100℃動粘度:30.6mm2/s、粘度指数:106)
[(B)成分相当のポリマー]
・ポリマー1(オレフィンオリゴマー、重量平均分子量(Mw):2,500、数平均分子量(Mn):1,600、分子量分布(Mw/Mn):1.6)
・ポリマー2(オレフィンオリゴマー、重量平均分子量(Mw):4,800、数平均分子量(Mn):3,000、分子量分布(Mw/Mn):1.6)
・ポリマー3(オレフィンオリゴマー、重量平均分子量(Mw):10,000、数平均分子量(Mn):5,900、分子量分布(Mw/Mn):1.7)
・ポリマー4(ポリα-オレフィン、重量平均分子量(Mw):6,600、数平均分子量(Mn):3,300、分子量分布(Mw/Mn):2.0)
・ポリマー5(ポリα-オレフィン、重量平均分子量(Mw):1,100、数平均分子量(Mn):900、分子量分布(Mw/Mn):1.2)
・ポリマー6(ポリブテン、重量平均分子量(Mw):5,300、数平均分子量(Mn):4,500、分子量分布(Mw/Mn):1.2)
・ポリマー7(ポリブテン、重量平均分子量(Mw):8,100、数平均分子量(Mn):6,600、分子量分布(Mw/Mn):1.2)
・ポリマー8(ポリブテン、重量平均分子量(Mw):14,000、数平均分子量(Mn):10,000、分子量分布(Mw/Mn):1.4)
[その他のポリマー]
・ポリマー9(オレフィンオリゴマー、重量平均分子量(Mw):17,000、数平均分子量(Mn):11,000、分子量分布(Mw/Mn):1.5)
・ポリマー10(ポリメタクリレート、重量平均分子量(Mw):26,000、数平均分子量(Mn):19,000、分子量分布(Mw/Mn):1.4)
・モリブデンDTC:下記構造式で表されるジアルキルジチオカルバミン酸モリブデン(MoDTC、モリブデン原子の含有量:10.0質量%)
[上記構造式中、R1、R2、R3、及びR4は、各々独立に、イソオクチル基(炭素数8:短鎖置換基群)及びイソトリデシル基(炭素数13:長鎖置換基群)から選択され、ジアルキルジチオカルバミン酸モリブデンの全分子中におけるイソオクチル基とイソトリデシル基とのモル比は、50:50である。X1及びX2は硫黄原子であり、X3及びX4は酸素原子である。]
・モリブデンアミン錯体:(モリブデン原子含有量:7.9質量%)
・三核ジチオカルバミン酸モリブデン:(MoDTC、モリブデン原子含有量:10質量%)
流動点降下剤、酸化防止剤、ジアルキルジチオリン酸亜鉛(ZnDTP)
表1において、潤滑油組成物中のモリブデン原子の含有量は、モリブデン系摩擦調整剤(M)に由来するモリブデン原子の含有量を反映する値である。
表1~表2において、潤滑油組成物中のリン原子の含有量は、その他の添加剤であるZnDTPに由来するリン原子の含有量を反映する値である。
SRV試験機(Optimol社製)を用い、下記の条件にて、調製した潤滑油組成物を使用した際の摩擦係数を測定した。
まず、30℃から140℃まで10度ごとに昇温しながら、各温度5分間、下記の条件にて摺動しながら試験を行った。
上記の140℃での試験における最終の1分間にて、摩擦係数を1秒ごとに測定し、最終の1分間の中での摩擦係数の平均値を算出した。
・シリンダ:AISI52100
・標準ディスク:AISI52100(最大高さ粗さ(Rz):0.45~0.65μm)
・鏡面ディスク:AISI52100(最大高さ粗さ(Rz):0.20μm未満)
・振動数:50Hz
・振幅:1.5mm
・荷重:400N
・温度:30~140℃ 10度毎に昇温
・試験時間:各温度5分間
一方、比較例1~4の潤滑油組成物は、実施例1~11の潤滑油組成物よりも摩擦係数が高いことがわかる。
Claims (9)
- 鉱油基油(A)と、重量平均分子量(Mw)が100~15,000のポリマー(B)と、モリブデン系摩擦調整剤(M)とを含有し、40℃における動粘度が35.0mm2/s以下である潤滑油組成物。
- 前記ポリマー(B)の含有量が、固形分換算における潤滑油全量基準で0.1~5.0質量%である請求項1に記載の潤滑油組成物。
- 前記ポリマー(B)が、ポリオレフィン(B-1)である請求項1又は2に記載の潤滑油組成物。
- 前記ポリマー(B)の重量平均分子量(Mw)が1,000~11,000である請求項1~3のいずれか1項に記載の潤滑油組成物。
- 前記モリブデン系摩擦調整剤(M)が、二核のジチオカルバミン酸モリブデン、三核のジチオカルバミン酸モリブデン、及びモリブデンアミン錯体から選択される2種以上を含む請求項1~4のいずれか1項に記載の潤滑油組成物。
- 前記モリブデン系摩擦調整剤(M)の含有量が、組成物全量基準におけるモリブデン原子換算で50~2,000質量ppmである請求項1~5のいずれか1項に記載の潤滑油組成物。
- 表面の最大高さ粗さ(Rz)が0.45μm未満の部材を備えるエンジンに用いられる請求項1~6のいずれか1項に記載の潤滑油組成物。
- ハイブリッド機構又はアイドリングストップ機構を搭載した自動車用エンジンに用いられる請求項1~7のいずれか1項に記載の潤滑油組成物。
- 請求項1~7のいずれか1項に記載の潤滑油組成物を用いて、表面の最大高さ粗さ(Rz)が0.45μm未満の部材を備えるエンジンを潤滑する、エンジンの潤滑方法。
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