JP5557413B2 - 内燃機関用潤滑油組成物 - Google Patents
内燃機関用潤滑油組成物 Download PDFInfo
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- JP5557413B2 JP5557413B2 JP2006037934A JP2006037934A JP5557413B2 JP 5557413 B2 JP5557413 B2 JP 5557413B2 JP 2006037934 A JP2006037934 A JP 2006037934A JP 2006037934 A JP2006037934 A JP 2006037934A JP 5557413 B2 JP5557413 B2 JP 5557413B2
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- 239000002184 metal Substances 0.000 claims description 54
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- 239000002270 dispersing agent Substances 0.000 claims description 18
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- 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 7
- 230000000694 effects Effects 0.000 description 7
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 7
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
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- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 6
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- 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 6
- 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 6
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- 239000003112 inhibitor Substances 0.000 description 6
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 6
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- 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 6
- 125000002948 undecyl 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])[H] 0.000 description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 5
- 150000001412 amines Chemical group 0.000 description 5
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 5
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 5
- 229920001577 copolymer Polymers 0.000 description 5
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 5
- 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 5
- 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 description 5
- 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 5
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 5
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 5
- 239000001384 succinic acid Substances 0.000 description 5
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- 125000002877 alkyl aryl group Chemical group 0.000 description 4
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- 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
- 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 4
- 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 4
- 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 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 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 4
- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 3
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 3
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 3
- 125000003277 amino group Chemical group 0.000 description 3
- 150000008064 anhydrides Chemical class 0.000 description 3
- 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 3
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- 125000002573 ethenylidene group Chemical group [*]=C=C([H])[H] 0.000 description 3
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- 125000000623 heterocyclic group Chemical group 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 125000001841 imino group Chemical group [H]N=* 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 3
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- 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 3
- 125000004430 oxygen atom Chemical group O* 0.000 description 3
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- 239000004711 α-olefin Substances 0.000 description 3
- IGLVTGYELORYGW-UHFFFAOYSA-N (2-butylphenyl) carbamodithioate Chemical compound CCCCC1=CC=CC=C1SC(N)=S IGLVTGYELORYGW-UHFFFAOYSA-N 0.000 description 2
- BIPXIVOXYSRYGA-UHFFFAOYSA-N (2-nonylphenyl) carbamodithioate Chemical compound CCCCCCCCCC1=CC=CC=C1SC(N)=S BIPXIVOXYSRYGA-UHFFFAOYSA-N 0.000 description 2
- 125000006702 (C1-C18) alkyl group Chemical group 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
- SZAQZZKNQILGPU-UHFFFAOYSA-N 2-[1-(2-hydroxy-3,5-dimethylphenyl)-2-methylpropyl]-4,6-dimethylphenol Chemical compound C=1C(C)=CC(C)=C(O)C=1C(C(C)C)C1=CC(C)=CC(C)=C1O SZAQZZKNQILGPU-UHFFFAOYSA-N 0.000 description 2
- GJYCVCVHRSWLNY-UHFFFAOYSA-N 2-butylphenol Chemical compound CCCCC1=CC=CC=C1O GJYCVCVHRSWLNY-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- 229910015900 BF3 Inorganic materials 0.000 description 2
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 2
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 2
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 125000003545 alkoxy group Chemical group 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 239000002518 antifoaming agent Substances 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
- WGQKYBSKWIADBV-UHFFFAOYSA-N benzylamine Chemical compound NCC1=CC=CC=C1 WGQKYBSKWIADBV-UHFFFAOYSA-N 0.000 description 2
- 229910021538 borax Inorganic materials 0.000 description 2
- WTEOIRVLGSZEPR-UHFFFAOYSA-N boron trifluoride Chemical compound FB(F)F WTEOIRVLGSZEPR-UHFFFAOYSA-N 0.000 description 2
- 159000000007 calcium salts Chemical class 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000004517 catalytic hydrocracking Methods 0.000 description 2
- 125000003901 ceryl 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])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 125000000753 cycloalkyl group Chemical group 0.000 description 2
- GHVNFZFCNZKVNT-UHFFFAOYSA-N decanoic acid Chemical compound CCCCCCCCCC(O)=O GHVNFZFCNZKVNT-UHFFFAOYSA-N 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
- AUTNMGCKBXKHNV-UHFFFAOYSA-P diazanium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [NH4+].[NH4+].O1B([O-])OB2OB([O-])OB1O2 AUTNMGCKBXKHNV-UHFFFAOYSA-P 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 125000005066 dodecenyl group Chemical group C(=CCCCCCCCCCC)* 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 125000002818 heptacosyl 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])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
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- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
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- VLCLHFYFMCKBRP-UHFFFAOYSA-N tricalcium;diborate Chemical class [Ca+2].[Ca+2].[Ca+2].[O-]B([O-])[O-].[O-]B([O-])[O-] VLCLHFYFMCKBRP-UHFFFAOYSA-N 0.000 description 1
- 125000005040 tridecenyl group Chemical group C(=CCCCCCCCCCCC)* 0.000 description 1
- AJSTXXYNEIHPMD-UHFFFAOYSA-N triethyl borate Chemical compound CCOB(OCC)OCC AJSTXXYNEIHPMD-UHFFFAOYSA-N 0.000 description 1
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- UKUWOJWHPCYQDY-UHFFFAOYSA-N trimagnesium boric acid diborate Chemical compound [Mg+2].[Mg+2].[Mg+2].OB(O)O.OB(O)O.[O-]B([O-])[O-].[O-]B([O-])[O-] UKUWOJWHPCYQDY-UHFFFAOYSA-N 0.000 description 1
- NFMWFGXCDDYTEG-UHFFFAOYSA-N trimagnesium;diborate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]B([O-])[O-].[O-]B([O-])[O-] NFMWFGXCDDYTEG-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Lubricants (AREA)
Description
また、本発明の第2は、潤滑油基油に、(A)無灰分散剤及び(B)PSSI(パーマネントシアスタビリティインデックス)が10〜100である粘度指数向上剤、並びに(C)金属系清浄剤、(D)酸化防止剤、(E)摩耗防止剤及び(F)摩擦調整剤から選ばれる少なくとも1種を含み、(A)成分の重量平均分子量(MwA)と組成物中の(A)成分の含有量(Ac:質量%)との関係式MwA×Ac/100を20〜240に調製してなることを特徴とする内燃機関用潤滑油組成物にある。
また、本発明の第3は、組成物の100℃におけるHTHS粘度が6.2mPa・s以下であることを特徴とする前記記載の内燃機関用潤滑油組成物にある。
本発明の第1における内燃機関用潤滑油組成物は、潤滑油基油に、(A)無灰分散剤及び(B)PSSI(パーマネントシアスタビリティインデックス)が10〜100である粘度指数向上剤、並びに(C)金属系清浄剤、(D)酸化防止剤、(E)摩耗防止剤及び(F)摩擦調整剤から選ばれる少なくとも1種を含み、組成物の粘度指数(VI)と組成物の100℃におけるHTHS粘度(HV100、単位:mPa・s)との数値の比(VI/HV100)が32以上であることが特徴である。
すなわち、本発明の内燃機関用潤滑油組成物は、組成物の粘度指数(VI)をより高めつつ、組成物の100℃におけるHTHS粘度をより低減させることにより優れた省燃費性能を発揮することができる内燃機関用潤滑油組成物である。
なお、ここでいう100℃又は150℃におけるHTHS粘度とは、100℃又は150℃、1×106s−1の剪断条件下における高温高剪断粘度(単位:mPa・s)を意味する。
本発明の内燃機関用潤滑油組成物における潤滑油基油は、鉱油、合成油及びこれらの混合物を例示することができる。
鉱油としては、具体的には、原油を常圧蒸留及び減圧蒸留して得られた潤滑油留分を、溶剤脱れき、溶剤抽出、水素化分解、溶剤脱ろう、接触脱ろう、水素化精製、硫酸洗浄、白土処理等の精製処理等を適宜組み合わせて精製したパラフィン系あるいはナフテン系等の油やノルマルパラフィン等を挙げることができる。溶剤精製、水素化精製処理したものが一般的に用いられるが、芳香族分をより低減することが可能である高度水素化分解プロセスやフィッシャートロプシュワックス等のGTL Wax(ガス・トゥー・リキッド・ワックス)を異性化した手法で製造したものを使用することがより好ましい。
コハク酸イミド系無灰分散剤としては、代表的には、下記一般式(1)又は(2)で表されるポリブテニルコハク酸イミド及びその誘導体等が挙げられる。
一般式(1)又は(2)の化合物に作用させるホウ素化合物としては、ホウ酸、ホウ酸塩、ホウ酸エステル類等が挙げられる。ホウ酸としては、具体的には例えばオルトホウ酸、メタホウ酸及びテトラホウ酸等が挙げられる。ホウ酸塩としては、ホウ酸のアルカリ金属塩、アルカリ土類金属塩又はアンモニウム塩等が挙げられ、より具体的には、例えばメタホウ酸リチウム、四ホウ酸リチウム、五ホウ酸リチウム、過ホウ酸リチウム等のホウ酸リチウム;メタホウ酸ナトリウム、二ホウ酸ナトリウム、四ホウ酸ナトリウム、五ホウ酸ナトリウム、六ホウ酸ナトリウム、八ホウ酸ナトリウム等のホウ酸ナトリウム;メタホウ酸カリウム、四ホウ酸カリウム、五ホウ酸カリウム、六ホウ酸カリウム、八ホウ酸カリウム等のホウ酸カリウム;メタホウ酸カルシウム、二ホウ酸カルシウム、四ホウ酸三カルシウム、四ホウ酸五カルシウム、六ホウ酸カルシウム等のホウ酸カルシウム;メタホウ酸マグネシウム、二ホウ酸マグネシウム、四ホウ酸三マグネシウム、四ホウ酸五マグネシウム、六ホウ酸マグネシウム等のホウ酸マグネシウム;及びメタホウ酸アンモニウム、四ホウ酸アンモニウム、五ホウ酸アンモニウム、八ホウ酸アンモニウム等のホウ酸アンモニウム等が挙げられる。また、ホウ酸エステルとしては、ホウ酸と好ましくは炭素数1〜6の脂肪族アルコールとのエステル等が挙げられ、より具体的には例えば、ホウ酸モノメチル、ホウ酸ジメチル、ホウ酸トリメチル、ホウ酸モノエチル、ホウ酸ジエチル、ホウ酸トリエチル、ホウ酸モノプロピル、ホウ酸ジプロピル、ホウ酸トリプロピル、ホウ酸モノブチル、ホウ酸ジブチル、ホウ酸トリブチル等が挙げられる。上記ホウ素化合物を作用させたコハク酸イミド誘導体は、耐熱性、酸化安定性に優れることから好ましく用いられる。
また、本発明における(A)成分の重量平均分子量(Mw)と数平均分子量(Mn)との比(Mw/Mn)は、特に制限はないが、通常1〜3、好ましくは1.5〜2、特に好ましくは1.6〜1.9である。
MwA×Ac/100
は、省燃費性とスラッジ抑制性能や清浄性とを両立できる点から20〜240であることが好ましく、その値は、省燃費性をより高めることができる点で、より好ましくは200以下、さらに好ましくは170以下、さらに好ましくは140以下、特に好ましくは100以下であり、スラッジ抑制性能や清浄性をより高めることができる点で、より好ましくは40以上、さらに好ましくは70以上、さらに好ましくは100以上であり、さらに、省燃費性とスラッジ抑制性能や清浄性とをバランス良く高いレベルで向上させることができる点で、望ましくは70〜200、より望ましくは100〜170である。
本発明においては、前記MwAが2000〜9500未満の(A)成分、前記MwAが9500〜20000の(A)成分、及びこれらの混合物を1種又は2種以上配合することができる。
(B)成分としては、非分散型、あるいは分散型の粘度指数向上剤等が挙げられる。非分散型粘度指数向上剤としては、具体的には、下記一般式(4)、(5)及び(6)で表される化合物の中から選ばれる1種又は2種以上のモノマー(B−1)の共重合体あるいはその水素化物等が例示できる。また、分散型粘度指数向上剤としては、具体的には、下記一般式(7)及び(8)で表される化合物の中から選ばれる2種以上のモノマーの共重合体又はその水素化物や、一般式(4)〜(6)で表される化合物の中から選ばれる1種又は2種以上のモノマー(B−1)と一般式(7)及び(8)で表される化合物の中から選ばれる1種又は2種以上のモノマー(B−2)との共重合体、或いはその水素化物等が例示できる。
なお、ここでいうPSSIとは、ASTM D 6022−01(Standard Practice for Calculation of Permanent Shear Stability Index)に準拠し、ASTM D 6278−02(Test Metohd for Shear Stability of Polymer Containing Fluids Using a European Diesel Injector Apparatus)により測定されたデータに基づき計算された、ポリマーの永久せん断安定性指数(Permanent Shear Stability Index)を意味する。
なお、本発明においては、0W−20、5W−20あるいはそれ以下のような低粘度グレードのエンジン油の場合であっても、(A)成分と(B)成分の最適配合により組成物の粘度指数をより高めるとともに100℃における高温高剪断粘度(HTHS粘度)を低くでき、省燃費性能をより高めることが可能となる。
(C)成分としては、アルカリ金属又はアルカリ土類金属系清浄剤を挙げることができ、具体的には、(C1)アルカリ金属又はアルカリ土類金属サリシレート系清浄剤、(C2)アルカリ金属又はアルカリ土類金属スルホネート系清浄剤、(C3)アルカリ金属又はアルカリ土類金属フェネート系清浄剤等を例示することができる。これらの中でも省燃費性能とスラッジ抑制性能、エンジン清浄性能をより向上できる点で、アルカリ金属又はアルカリ土類金属サリシレート系清浄剤を含有させることが好ましい。
アルカリ金属又はアルカリ土類金属サリシレート系清浄剤としては、その構造に特に制限はなく、炭素数1〜40のアルキル基を1〜2個有するサリチル酸の金属塩、好ましくはアルカリ金属塩又はアルカリ土類金属塩、特にマグネシウム塩及び/又はカルシウム塩が好ましく用いられる。
ここで、3,5−ジアルキルサリチル酸としては、(a)炭素数10〜40、好ましくは炭素数10〜19又は20〜30、さらに好ましくは炭素数10〜19のアルキル基を3位及び5位に有する3,5−ジアルキルサリチル酸、(b)炭素数1〜9、好ましくは炭素数1〜4、特に好ましくは炭素数1のアルキル基を3位又は5位に、炭素数10〜40、好ましくは炭素数10〜20のアルキル基を5位又は3位に有する3,5−ジアルキルサリチル酸等が挙げられる。本発明におけるジアルキルサリチル酸としては、(a)(b)いずれであっても良いが、製造コストの点で(a)の3,5−ジアルキルサリチル酸であることが好ましい。
また、3−アルキルサリチル酸金属塩の構成比は、アルキルサリチル酸金属塩100mol%に対し、40〜100mol%、好ましくは45〜80mol%、さらに好ましくは50〜60mol%である。なお、4−アルキルサリチル酸金属塩及び5−アルキルサリチル酸金属塩の合計の構成比は、アルキルサリチル酸金属塩100mol%に対し、上記3−アルキルサリチル酸金属塩、ジアルキルサリチル酸金属塩を除いた構成比に相当し、0〜60mol%、好ましくは20〜50mol%、さらに好ましくは30〜45mol%である。ジアルキルサリチル酸金属塩を少量含むことで省燃費性、高温清浄性、酸化安定性、摩耗防止性及び低温特性にバランス良く優れる組成物を得ることができ、3−アルキルサリシレートの構成比を40mol%以上とすることで、5−アルキルサリチル酸金属塩の構成比を相対的に低くすることができ、油溶性を向上させることができる。
なお、これらの反応は、通常、溶媒(ヘキサン等の脂肪族炭化水素溶剤、キシレン等の芳香族炭化水素溶剤、軽質潤滑油基油等)中で行われ、その金属含有量が1.0〜20質量%、好ましくは2.0〜16質量%のものを用いるのが望ましい。
摩耗防止剤としては、リン酸エステル類、亜リン酸エステル類及びこれらのアミン塩、ジアルキルジチオリン酸亜鉛、ジアルキルチオリン酸亜鉛、ジアルキルリン酸亜鉛、ホスホン酸エステル及びその誘導体、β−ジチオホスホリル化プロピオン酸及びその誘導体等のリン系化合物、ジアルキルジチオカルバミン酸亜鉛、ジアルキルジチオカーバメート類、ジスルフィド類、硫化オレフィン類、硫化油脂類等の硫黄系化合物等及びこれらの任意混合物等が挙げられる。
本発明において、(E)成分の含有量は特に制限はないが、通常0.1〜5質量%であり、リン系化合物を使用する場合は、組成物全量基準で、リン元素量として、好ましくは0.01〜0.2質量%、より好ましくは0.04〜0.08質量%である。組成物中のリン含有量を0.08質量%以下、特に0.06質量%以下とすることで排ガス浄化触媒等への影響を低減することができる。
上記無灰系摩擦低減剤としては、特に制限はなく、公知の無灰系摩擦低減剤を挙げることができ、例えば、炭素数6〜30の直鎖状若しくは分枝状、好ましくは直鎖状炭化水素基を有するアミン化合物、脂肪酸エステル、脂肪酸アミド、脂肪酸金属塩等を例示することができる。上記炭素数6〜30の直鎖状若しくは分枝状炭化水素基としては、具体的には、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、ノナデシル基、イコシル基、ヘンイコシル基、ドコシル基、トリコシル基、テトラコシル基、ペンタコシル基、ヘキサコシル基、ヘプタコシル基、オクタコシル基、ノナコシル基、トリアコンチル基等のアルキル基(これらアルキル基は直鎖状でも分枝状でもよい);ヘキセニル基、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、ヘキサデセニル基、ヘプタデセニル基、オクタデセニル基、ノナデセニル基、イコセニル基、ヘンイコセニル基、ドコセニル基、トリコセニル基、テトラコセニル基、ペンタコセニル基、ヘキサコセニル基、ヘプタコセニル基、オクタコセニル基、ノナコセニル基、トリアコンテニル基等のアルケニル基(これらアルケニル基は直鎖状でも分枝状でもよく、また二重結合の位置も任意である);等が例示できる。
表1に示すように本発明の内燃機関用潤滑油組成物(実施例1〜9)、及び比較として本発明の要件を満たさない組成物(比較例1)を調製した。これらの組成物の粘度グレードはすべて0W−20油とし、150℃におけるHTHS粘度を2.6mPa・sとなるように調製した。
(1)省燃費性試験
エンジンモータリング試験回転数1500rpm、油・水温80℃の条件において、モータリングによるエンジン全体の摩擦トルクを測定し、比較例1の0W−20油を使用した場合の摩擦トルクを基準として、各実施例の組成物を使用した場合のトルク低減率を算出した。トルク低減率が高いエンジン各部のフリクション低減効果が高く、省燃費に優れたエンジン油と評価される。
(2)清浄性試験:JASO VG20E清浄性試験(改)
社団法人 自動車技術会規格(JASO M331−91)に規定されている自動車ガソリン機関潤滑油の清浄性試験法に準拠し、300時間後のエンジン右側ロッカーカバーのスラッジ評点を評価した。評点が8.5以上を合格、9.2以上を特に優れたものとした。
Claims (1)
- 高度水素化分解鉱油系潤滑油基油に、(A)ポリブテニルコハク酸イミド系無灰分散剤及び(B)PSSI(パーマネントシアスタビリティインデックス)が10〜100であるポリメタクリレート系粘度指数向上剤、並びに(C)金属系清浄剤、(D)酸化防止剤、(E)摩耗防止剤及び(F)摩擦調整剤から選ばれる少なくとも1種を含み、前記(A)成分の重量平均分子量(MwA)が2000〜20000であり、組成物中の含有量(Ac:質量%)が0.4質量%以上4質量%未満であり、重量平均分子量(MwA)と組成物中の(A)成分の含有量(Ac:質量%)との関係式MwA×Ac/100が40〜200であり、組成物の粘度指数(VI)と組成物の100℃におけるHTHS粘度(HV100、単位:mPa・s)との数値の比(VI/HV100)が32以上であり、組成物の100℃におけるHTHS粘度が6.2mPa・s以下であり、かつ150℃におけるHTHS粘度が2.4〜2.7mPa・sであることを特徴とする内燃機関用潤滑油組成物。
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