JP5815809B2 - 潤滑油組成物 - Google Patents
潤滑油組成物 Download PDFInfo
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- JP5815809B2 JP5815809B2 JP2014149134A JP2014149134A JP5815809B2 JP 5815809 B2 JP5815809 B2 JP 5815809B2 JP 2014149134 A JP2014149134 A JP 2014149134A JP 2014149134 A JP2014149134 A JP 2014149134A JP 5815809 B2 JP5815809 B2 JP 5815809B2
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- -1 alkaline earth metal borate Chemical class 0.000 claims description 52
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- 239000003607 modifier Substances 0.000 claims description 23
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- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 7
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- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
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- KZNICNPSHKQLFF-UHFFFAOYSA-N dihydromaleimide Natural products O=C1CCC(=O)N1 KZNICNPSHKQLFF-UHFFFAOYSA-N 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
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- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 description 3
- VLAPMBHFAWRUQP-UHFFFAOYSA-L molybdic acid Chemical class O[Mo](O)(=O)=O VLAPMBHFAWRUQP-UHFFFAOYSA-L 0.000 description 3
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- 125000004433 nitrogen atom Chemical group N* 0.000 description 3
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- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
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- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 description 2
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical compound CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
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- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 2
- 150000004996 alkyl benzenes Chemical class 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
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- WTEOIRVLGSZEPR-UHFFFAOYSA-N boron trifluoride Chemical compound FB(F)F WTEOIRVLGSZEPR-UHFFFAOYSA-N 0.000 description 2
- AVVIDTZRJBSXML-UHFFFAOYSA-L calcium;2-carboxyphenolate;dihydrate Chemical compound O.O.[Ca+2].OC1=CC=CC=C1C([O-])=O.OC1=CC=CC=C1C([O-])=O AVVIDTZRJBSXML-UHFFFAOYSA-L 0.000 description 2
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
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- 150000001447 alkali salts Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000005215 alkyl ethers Chemical class 0.000 description 1
- 125000005037 alkyl phenyl group Chemical group 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 125000002490 anilino group Chemical group [H]N(*)C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 229940111121 antirheumatic drug quinolines Drugs 0.000 description 1
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 125000000043 benzamido group Chemical group [H]N([*])C(=O)C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 1
- 239000012964 benzotriazole Substances 0.000 description 1
- 150000001565 benzotriazoles Chemical class 0.000 description 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- SAOKZLXYCUGLFA-UHFFFAOYSA-N bis(2-ethylhexyl) adipate Chemical compound CCCCC(CC)COC(=O)CCCCC(=O)OCC(CC)CCCC SAOKZLXYCUGLFA-UHFFFAOYSA-N 0.000 description 1
- 150000001639 boron compounds Chemical class 0.000 description 1
- JDYNAEKPBWBUMS-UHFFFAOYSA-M calcium;2-carboxyphenolate;dihydrogen borate Chemical compound [Ca+2].OB(O)[O-].OC(=O)C1=CC=CC=C1[O-] JDYNAEKPBWBUMS-UHFFFAOYSA-M 0.000 description 1
- 230000001914 calming effect Effects 0.000 description 1
- DKVNPHBNOWQYFE-UHFFFAOYSA-N carbamodithioic acid Chemical compound NC(S)=S DKVNPHBNOWQYFE-UHFFFAOYSA-N 0.000 description 1
- CSNJTIWCTNEOSW-UHFFFAOYSA-N carbamothioylsulfanyl carbamodithioate Chemical compound NC(=S)SSC(N)=S CSNJTIWCTNEOSW-UHFFFAOYSA-N 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
- 125000004915 dibutylamino group Chemical group C(CCC)N(CCCC)* 0.000 description 1
- 239000010710 diesel engine oil Substances 0.000 description 1
- 150000005690 diesters Chemical class 0.000 description 1
- 125000001664 diethylamino group Chemical group [H]C([H])([H])C([H])([H])N(*)C([H])([H])C([H])([H])[H] 0.000 description 1
- KPGRTCPQLMJHFQ-UHFFFAOYSA-N diethylaminomethyl 2-methylprop-2-enoate Chemical compound CCN(CC)COC(=O)C(C)=C KPGRTCPQLMJHFQ-UHFFFAOYSA-N 0.000 description 1
- 125000002147 dimethylamino group Chemical group [H]C([H])([H])N(*)C([H])([H])[H] 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- WDNQRCVBPNOTNV-UHFFFAOYSA-N dinonylnaphthylsulfonic acid Chemical compound C1=CC=C2C(S(O)(=O)=O)=C(CCCCCCCCC)C(CCCCCCCCC)=CC2=C1 WDNQRCVBPNOTNV-UHFFFAOYSA-N 0.000 description 1
- VJHINFRRDQUWOJ-UHFFFAOYSA-N dioctyl sebacate Chemical compound CCCCC(CC)COC(=O)CCCCCCCCC(=O)OCC(CC)CCCC VJHINFRRDQUWOJ-UHFFFAOYSA-N 0.000 description 1
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Chemical class C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 description 1
- 125000004914 dipropylamino group Chemical group C(CC)N(CCC)* 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000012990 dithiocarbamate Substances 0.000 description 1
- LZJUZSYHFSVIGJ-UHFFFAOYSA-N ditridecyl hexanedioate Chemical compound CCCCCCCCCCCCCOC(=O)CCCCC(=O)OCCCCCCCCCCCCC LZJUZSYHFSVIGJ-UHFFFAOYSA-N 0.000 description 1
- FVBSDVQDRFRKRF-UHFFFAOYSA-N ditridecyl pentanedioate Chemical compound CCCCCCCCCCCCCOC(=O)CCCC(=O)OCCCCCCCCCCCCC FVBSDVQDRFRKRF-UHFFFAOYSA-N 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- WOLATMHLPFJRGC-UHFFFAOYSA-N furan-2,5-dione;styrene Chemical compound O=C1OC(=O)C=C1.C=CC1=CC=CC=C1 WOLATMHLPFJRGC-UHFFFAOYSA-N 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010711 gasoline engine oil Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 238000004128 high performance liquid chromatography Methods 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 150000002430 hydrocarbons Chemical group 0.000 description 1
- 125000001183 hydrocarbyl group Chemical group 0.000 description 1
- 238000007327 hydrogenolysis reaction Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 150000002460 imidazoles Chemical class 0.000 description 1
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000004668 long chain fatty acids Chemical class 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229960001047 methyl salicylate Drugs 0.000 description 1
- 125000006384 methylpyridyl group Chemical group 0.000 description 1
- 239000004200 microcrystalline wax Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 229910000476 molybdenum oxide Inorganic materials 0.000 description 1
- TVWWSIKTCILRBF-UHFFFAOYSA-N molybdenum trisulfide Chemical compound S=[Mo](=S)=S TVWWSIKTCILRBF-UHFFFAOYSA-N 0.000 description 1
- PDKHNCYLMVRIFV-UHFFFAOYSA-H molybdenum;hexachloride Chemical compound [Cl-].[Cl-].[Cl-].[Cl-].[Cl-].[Cl-].[Mo] PDKHNCYLMVRIFV-UHFFFAOYSA-H 0.000 description 1
- BRESEFMHKFGSDY-UHFFFAOYSA-N molybdenum;pyrrolidine-2,5-dione Chemical class [Mo].O=C1CCC(=O)N1 BRESEFMHKFGSDY-UHFFFAOYSA-N 0.000 description 1
- 125000004573 morpholin-4-yl group Chemical group N1(CCOCC1)* 0.000 description 1
- RZRFZEDWURIJRY-UHFFFAOYSA-N morpholin-4-ylmethyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCN1CCOCC1 RZRFZEDWURIJRY-UHFFFAOYSA-N 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- AFFLGGQVNFXPEV-UHFFFAOYSA-N n-decene Natural products CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 1
- 150000004780 naphthols Chemical class 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- CQRYARSYNCAZFO-UHFFFAOYSA-N o-hydroxybenzyl alcohol Natural products OCC1=CC=CC=C1O CQRYARSYNCAZFO-UHFFFAOYSA-N 0.000 description 1
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical compound [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 description 1
- BVJSUAQZOZWCKN-UHFFFAOYSA-N p-hydroxybenzyl alcohol Chemical compound OCC1=CC=C(O)C=C1 BVJSUAQZOZWCKN-UHFFFAOYSA-N 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical class [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 1
- 235000011007 phosphoric acid Nutrition 0.000 description 1
- 150000003014 phosphoric acid esters Chemical class 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 125000003386 piperidinyl group Chemical group 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002685 polymerization catalyst Substances 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 229920013636 polyphenyl ether polymer Polymers 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 150000003222 pyridines Chemical class 0.000 description 1
- 125000004076 pyridyl group Chemical group 0.000 description 1
- 229940083082 pyrimidine derivative acting on arteriolar smooth muscle Drugs 0.000 description 1
- 150000003230 pyrimidines Chemical class 0.000 description 1
- 125000000719 pyrrolidinyl group Chemical group 0.000 description 1
- 125000004929 pyrrolidonyl group Chemical group N1(C(CCC1)=O)* 0.000 description 1
- 125000000168 pyrrolyl group Chemical group 0.000 description 1
- 150000003248 quinolines Chemical class 0.000 description 1
- 125000004151 quinonyl group Chemical group 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 150000003580 thiophosphoric acid esters Chemical class 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000012991 xanthate Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- MBBWTVUFIXOUBE-UHFFFAOYSA-L zinc;dicarbamodithioate Chemical compound [Zn+2].NC([S-])=S.NC([S-])=S MBBWTVUFIXOUBE-UHFFFAOYSA-L 0.000 description 1
Landscapes
- Lubricants (AREA)
Description
(1)パラフィン基系原油および/または混合基系原油の常圧蒸留による留出油
(2)パラフィン基系原油および/または混合基系原油の常圧蒸留残渣油の減圧蒸留による留出油(WVGO)
(3)潤滑油脱ろう工程により得られるワックス(スラックワックス等)および/またはガストゥリキッド(GTL)プロセス等により得られる合成ワックス(フィッシャートロプシュワックス、GTLワックス等)
(4)基油(1)〜(3)から選ばれる1種または2種以上の混合油および/または当該混合油のマイルドハイドロクラッキング処理油
(5)基油(1)〜(4)から選ばれる2種以上の混合油
(6)基油(1)、(2)、(3)、(4)または(5)の脱れき油(DAO)
(7)基油(6)のマイルドハイドロクラッキング処理油(MHC)
(8)基油(1)〜(7)から選ばれる2種以上の混合油。
(9)上記基油(1)〜(8)から選ばれる基油または当該基油から回収された潤滑油留分を水素化分解し、その生成物またはその生成物から蒸留等により回収される潤滑油留分について溶剤脱ろうや接触脱ろうなどの脱ろう処理を行い、または当該脱ろう処理をした後に蒸留することによって得られる水素化分解鉱油
(10)上記基油(1)〜(8)から選ばれる基油または当該基油から回収された潤滑油留分を水素化異性化し、その生成物またはその生成物から蒸留等により回収される潤滑油留分について溶剤脱ろうや接触脱ろうなどの脱ろう処理を行い、または、当該脱ろう処理をしたあとに蒸留することによって得られる水素化異性化鉱油。
(I)100℃における動粘度が1.5mm2/s以上3.5mm2/s未満、より好ましくは2.0〜3.0mm2/sの潤滑油基油
(II)100℃における動粘度が3.5mm2/s以上4.5mm2/s未満、より好ましくは3.7〜4.3mm2/sの潤滑油基油
(III)100℃における動粘度が4.5〜10mm2/s、より好ましくは4.8〜9mm2/s、特に好ましくは5.5〜8.0mm2/sの潤滑油基油。
(IV)40℃における動粘度が6.0mm2/s以上12mm2/s未満、より好ましくは8.0〜12mm2/sの潤滑油基油
(V)40℃における動粘度が12mm2/s以上28mm2/s未満、より好ましくは13〜19mm2/sの潤滑油基油
(VI)40℃における動粘度が28〜50mm2/s、より好ましくは29〜45mm2/s、特に好ましくは30〜40mm2/sの潤滑油基油。
ρ=0.0025×kv100+0.816 (A)
[式中、kv100は潤滑油基油の100℃における動粘度(mm2/s)を示す。]
A=4.3×kv100+100 (B)
[式中、kv100は潤滑油基油の100℃における動粘度(mm2/s)を示す。]
[上記一般式(1)中、R1は水素又はメチル基を示し、R2は炭素数1〜200の直鎖状又は分枝状の炭化水素基を示す。]
[一般式(2)中、R3は水素原子又はメチル基を示し、R4は炭素数1〜18のアルキレン基を示し、E1は窒素原子を1〜2個、酸素原子を0〜2個含有するアミン残基又は複素環残基を示し、aは0又は1を示す。]
[一般式(3)中、R5は水素原子又はメチル基を示し、E2は窒素原子を1〜2個、酸素原子を0〜2個含有するアミン残基又は複素環残基を示す。]
実施例1〜3および比較例1〜4においては、それぞれ以下に示す基油および添加剤を用いて表2に示す組成を有する潤滑油組成物を調製した。基油O−1、O−2の性状を表1に示す。
(基油)
O−1(基油1):n−パラフィン含有油を水素化分解/水素化異性化した鉱油
O−2(基油2):水素化分解鉱油
(添加剤)
A−1:MoDTC(Mo含有量10mass%)
B−1:過塩基性ホウ酸カルシウムサリシレート(塩基価190mgKOH/g,Ca含有量6.8%、B含有量2.7%)
C−1:過塩基性カルシウムサリシレート(塩基価170mgKOH/g,Ca含有量6.3%)
D−1:ポリメタクリレート(ΔKV40/ΔKV100=1.6、ΔHTHS100/ΔHTHS150=1.48、MW=400,000、PSSI=4、Mw/Mn=3.1、Mw/PSSI=100,000)
d−2:分散型ポリメタクリレート(ΔKV40/ΔKV100=3.3、ΔHTHS100/ΔHTHS150=1.79、MW=300,000、PSSI=40、Mw/Mn=4.0、Mw/PSSI=7500)
e−1:コハク酸イミド系分散剤(Mw13000)
f−1:その他添加剤(酸化防止剤、摩耗防止剤、流動点降下剤、消泡剤等)。
実施例1〜3および比較例1〜4の各潤滑油組成物について、40℃または100℃における動粘度、粘度指数、100℃または150℃におけるHTHS粘度を測定した。また、省燃費性の測定はエンジンフリクションを測定した。各物性値、省燃費性の測定は以下の評価方法により行った。得られた結果を表2に示す。
(1)動粘度:ASTM D−445
(2)粘度指数:JIS K 2283−1993
(3)HTHS粘度:ASTM D−4683
(4)エンジンフリクション試験:2Lエンジンを用い、油温100℃、回転数500〜1500rpmの各測定点でのフリクションの平均値を算出し、比較例2を基準油としたときのフリクション改善率を算出した。
Claims (3)
- 100℃における動粘度が1〜20mm2/sである潤滑油基油と、
摩擦調整剤と、
油溶性金属塩をアルカリ土類金属ホウ酸塩で過塩基化した第1の過塩基性金属塩と、
油溶性金属塩をアルカリ土類金属炭酸塩で過塩基化した第2の過塩基性金属塩と、
を含有し、前記摩擦調整剤が有機モリブデン系摩擦調整剤を含み、前記第1の過塩基性金属塩がアルカリ土類金属サリシレートをアルカリ土類金属ホウ酸塩で過塩基化させた過塩基性アルカリ土類金属サリシレートであり、前記第1の過塩基性金属塩に由来する金属分の含有量および前記第2の過塩基性金属塩に由来する金属分の含有量の合計(M)と前記第1の過塩基性金属塩に由来するホウ素含有量(MB)との質量比(M/MB)が0.1以上であることを特徴とする潤滑油組成物。 - 前記摩擦調整剤に由来するモリブデンの含有量(Mo)と前記第1の過塩基性金属塩に由来するホウ素含有量(MB)との質量比(Mo/MB)が0.1以上であることを特徴とする、請求項1に記載の潤滑油組成物。
- PSSIが40以下、分子量とPSSIの比(Mw/PSSI)が1×104以上の粘度指数向上剤をさらに含有することを特徴とする、請求項1又は2に記載の潤滑油組成物。
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