EP2428550A1 - Lubricating oil composition - Google Patents
Lubricating oil composition Download PDFInfo
- Publication number
- EP2428550A1 EP2428550A1 EP11180359A EP11180359A EP2428550A1 EP 2428550 A1 EP2428550 A1 EP 2428550A1 EP 11180359 A EP11180359 A EP 11180359A EP 11180359 A EP11180359 A EP 11180359A EP 2428550 A1 EP2428550 A1 EP 2428550A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- content
- lubricating oil
- oil composition
- amount
- sulfur content
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 98
- 239000010687 lubricating oil Substances 0.000 title claims abstract description 94
- -1 organic acid calcium salt Chemical class 0.000 claims abstract description 72
- 239000003599 detergent Substances 0.000 claims abstract description 56
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000011575 calcium Substances 0.000 claims abstract description 46
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 46
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 38
- 230000003647 oxidation Effects 0.000 claims abstract description 37
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 37
- 239000002199 base oil Substances 0.000 claims abstract description 25
- 239000003112 inhibitor Substances 0.000 claims abstract description 22
- 239000002270 dispersing agent Substances 0.000 claims abstract description 18
- 239000000295 fuel oil Substances 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 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 claims abstract description 8
- 229910000165 zinc phosphate Inorganic materials 0.000 claims abstract description 8
- 230000001050 lubricating effect Effects 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 45
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 43
- 239000011593 sulfur Substances 0.000 claims description 43
- 125000004432 carbon atom Chemical group C* 0.000 claims description 36
- KZNICNPSHKQLFF-UHFFFAOYSA-N dihydromaleimide Natural products O=C1CCC(=O)N1 KZNICNPSHKQLFF-UHFFFAOYSA-N 0.000 claims description 36
- 229960002317 succinimide Drugs 0.000 claims description 22
- 150000001875 compounds Chemical class 0.000 claims description 21
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 19
- 239000011574 phosphorus Substances 0.000 claims description 19
- 229910052698 phosphorus Inorganic materials 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 15
- 229910052799 carbon Inorganic materials 0.000 claims description 15
- 239000000460 chlorine Substances 0.000 claims description 15
- 229910052801 chlorine Inorganic materials 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 239000003921 oil Substances 0.000 claims description 12
- 239000011701 zinc Substances 0.000 claims description 12
- 229910052725 zinc Inorganic materials 0.000 claims description 12
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 239000011733 molybdenum Substances 0.000 claims description 7
- 230000002401 inhibitory effect Effects 0.000 claims description 6
- 229920001083 polybutene Polymers 0.000 claims description 6
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 5
- 150000008064 anhydrides Chemical class 0.000 claims description 4
- 229920000768 polyamine Polymers 0.000 claims description 3
- 239000010705 motor oil Substances 0.000 claims description 2
- 239000004215 Carbon black (E152) Substances 0.000 abstract description 3
- 229930195733 hydrocarbon Natural products 0.000 abstract description 3
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 3
- 229910052783 alkali metal Inorganic materials 0.000 description 13
- 239000002585 base Substances 0.000 description 13
- 239000007789 gas Substances 0.000 description 13
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 9
- 239000003208 petroleum Substances 0.000 description 8
- 239000000654 additive Substances 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 5
- 125000004433 nitrogen atom Chemical group N* 0.000 description 5
- 239000000344 soap Substances 0.000 description 5
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 150000001340 alkali metals Chemical class 0.000 description 4
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 4
- 239000004327 boric acid Substances 0.000 description 4
- 229910052796 boron Inorganic materials 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 125000005266 diarylamine group Chemical group 0.000 description 4
- 150000002148 esters Chemical class 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 235000010755 mineral Nutrition 0.000 description 4
- 150000003333 secondary alcohols Chemical class 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 125000003342 alkenyl group Chemical group 0.000 description 3
- 159000000007 calcium salts Chemical class 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000002480 mineral oil Substances 0.000 description 3
- 235000010446 mineral oil Nutrition 0.000 description 3
- 150000007524 organic acids Chemical class 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 150000003138 primary alcohols Chemical class 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 3
- FALRKNHUBBKYCC-UHFFFAOYSA-N 2-(chloromethyl)pyridine-3-carbonitrile Chemical compound ClCC1=NC=CC=C1C#N FALRKNHUBBKYCC-UHFFFAOYSA-N 0.000 description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 2
- 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 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
- CFXCGWWYIDZIMU-UHFFFAOYSA-N Octyl-3,5-di-tert-butyl-4-hydroxy-hydrocinnamate Chemical compound CCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 CFXCGWWYIDZIMU-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical group [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 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
- 238000010000 carbonizing Methods 0.000 description 2
- 238000005660 chlorination reaction Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- BRESEFMHKFGSDY-UHFFFAOYSA-N molybdenum;pyrrolidine-2,5-dione Chemical compound [Mo].O=C1CCC(=O)N1 BRESEFMHKFGSDY-UHFFFAOYSA-N 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 2
- 150000002989 phenols Chemical class 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 229940014800 succinic anhydride Drugs 0.000 description 2
- WMYJOZQKDZZHAC-UHFFFAOYSA-H trizinc;dioxido-sulfanylidene-sulfido-$l^{5}-phosphane Chemical class [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([S-])=S.[O-]P([O-])([S-])=S WMYJOZQKDZZHAC-UHFFFAOYSA-H 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004711 α-olefin Substances 0.000 description 2
- RUFPHBVGCFYCNW-UHFFFAOYSA-N 1-naphthylamine Chemical class C1=CC=C2C(N)=CC=CC2=C1 RUFPHBVGCFYCNW-UHFFFAOYSA-N 0.000 description 1
- KGRVJHAUYBGFFP-UHFFFAOYSA-N 2,2'-Methylenebis(4-methyl-6-tert-butylphenol) Chemical compound CC(C)(C)C1=CC(C)=CC(CC=2C(=C(C=C(C)C=2)C(C)(C)C)O)=C1O KGRVJHAUYBGFFP-UHFFFAOYSA-N 0.000 description 1
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- QHPKIUDQDCWRKO-UHFFFAOYSA-N 2,6-ditert-butyl-4-[2-(3,5-ditert-butyl-4-hydroxyphenyl)propan-2-yl]phenol Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(C(C)(C)C=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 QHPKIUDQDCWRKO-UHFFFAOYSA-N 0.000 description 1
- YFHKLSPMRRWLKI-UHFFFAOYSA-N 2-tert-butyl-4-(3-tert-butyl-4-hydroxy-5-methylphenyl)sulfanyl-6-methylphenol Chemical compound CC(C)(C)C1=C(O)C(C)=CC(SC=2C=C(C(O)=C(C)C=2)C(C)(C)C)=C1 YFHKLSPMRRWLKI-UHFFFAOYSA-N 0.000 description 1
- RKLRVTKRKFEVQG-UHFFFAOYSA-N 2-tert-butyl-4-[(3-tert-butyl-4-hydroxy-5-methylphenyl)methyl]-6-methylphenol Chemical compound CC(C)(C)C1=C(O)C(C)=CC(CC=2C=C(C(O)=C(C)C=2)C(C)(C)C)=C1 RKLRVTKRKFEVQG-UHFFFAOYSA-N 0.000 description 1
- MDWVSAYEQPLWMX-UHFFFAOYSA-N 4,4'-Methylenebis(2,6-di-tert-butylphenol) Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 MDWVSAYEQPLWMX-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-N Carbamic acid Chemical compound NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 1
- 239000005749 Copper compound Substances 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- 238000007065 Kolbe-Schmitt synthesis reaction Methods 0.000 description 1
- 238000006683 Mannich reaction Methods 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- 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 1
- QAPVYZRWKDXNDK-UHFFFAOYSA-N P,P-Dioctyldiphenylamine Chemical compound C1=CC(CCCCCCCC)=CC=C1NC1=CC=C(CCCCCCCC)C=C1 QAPVYZRWKDXNDK-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 125000002877 alkyl aryl group Chemical group 0.000 description 1
- 150000004996 alkyl benzenes Chemical class 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- OGBUMNBNEWYMNJ-UHFFFAOYSA-N batilol Chemical class CCCCCCCCCCCCCCCCCCOCC(O)CO OGBUMNBNEWYMNJ-UHFFFAOYSA-N 0.000 description 1
- 125000003354 benzotriazolyl group Chemical class N1N=NC2=C1C=CC=C2* 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 238000004517 catalytic hydrocracking Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 150000001880 copper compounds Chemical class 0.000 description 1
- 150000005676 cyclic carbonates Chemical class 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000000502 dialysis Methods 0.000 description 1
- LMODBLQHQHXPEI-UHFFFAOYSA-N dibutylcarbamothioylsulfanylmethyl n,n-dibutylcarbamodithioate Chemical compound CCCCN(CCCC)C(=S)SCSC(=S)N(CCCC)CCCC LMODBLQHQHXPEI-UHFFFAOYSA-N 0.000 description 1
- 239000010710 diesel engine oil Substances 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- MIMDHDXOBDPUQW-UHFFFAOYSA-N dioctyl decanedioate Chemical compound CCCCCCCCOC(=O)CCCCCCCCC(=O)OCCCCCCCC MIMDHDXOBDPUQW-UHFFFAOYSA-N 0.000 description 1
- 239000012990 dithiocarbamate Substances 0.000 description 1
- 150000004659 dithiocarbamates Chemical class 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000013538 functional additive Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000006317 isomerization reaction Methods 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 1
- 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 1
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 229940113162 oleylamide Drugs 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 150000008301 phosphite esters Chemical class 0.000 description 1
- 229920001281 polyalkylene Polymers 0.000 description 1
- 229920013639 polyalphaolefin Polymers 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 239000005077 polysulfide Substances 0.000 description 1
- 229920001021 polysulfide Polymers 0.000 description 1
- 150000008117 polysulfides Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 150000003871 sulfonates Chemical class 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 150000004867 thiadiazoles Chemical class 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
Classifications
-
- 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
- C10M163/00—Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution 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
- 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
-
- 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
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- 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
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- 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
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- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/04—Detergent property or dispersant property
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- C10N2030/43—Sulfur free or low sulfur content compositions
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- C10N2030/52—Base number [TBN]
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- C10N2040/252—Diesel engines
- C10N2040/253—Small diesel engines
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- C10N2060/00—Chemical after-treatment of the constituents of the lubricating composition
- C10N2060/14—Chemical after-treatment of the constituents of the lubricating composition by boron or a compound containing boron
Definitions
- the present invention relates to a lubricating oil composition favorably employable for lubricating an internal combustion engine operated overland such as a diesel engine, a gasoline engine or a gas engine.
- the invention relates to a lubricating oil composition for internal combustion engines which has a low sulfated ash content, a low phosphorus content and a low sulfur content and shows good high temperature detergency and anti-wear performance, and which gives less adverse effects to an exhaust gas cleaning apparatus such as a particulate filter or an oxidation catalyst mounted on a car for oxidizing unburnt soot, fuel and lubricating oil contained in exhausted gas, so that the lubricating oil composition can comply with the recently adopted severe exhaust gas requirements and further can comply with more severe exhaust gas requirements which are probably adopted in future.
- the invention provides an environment friendly lubricating oil composition for internal combustion engines which is favorably employable with vehicles operated using hydrocarbon fuel oil having a sulfur content of not more than approximately 0.005 wt.%, particularly not more than approximately 0.001 wt.%, specifically diesel engine-mounted vehicles equipped with exhaust gas-cleaning apparatuses such as a particulate filter and an oxidation catalyst.
- the sulfur in the fuel oil is burnt to produce unfavorable products such as sulfuric acid and sulfate in the exhaust gas which gives adverse effects to the oxidation catalyst.
- the sulfur content of diesel fuel oils for diesel engine-mounted vehicles has decreased from not more than approximately 0.005 wt.% to not more than approximately 0.001 wt.%.
- the sulfur content in the fuel oil decreases, the content of the metal-containing detergent serving for neutralizing the sulfuric acid or the like in the lubricating oil composition can be decreased. It is known that a portion of the lubricating oil composition is burnt in the engine and incorporated into the exhaust gas.
- the metal content and sulfur content in the lubricating oil composition be as low as possible.
- the phosphorus content in the lubricating oil composition is decreased so as to keep the catalyst from deteriorating.
- the chlorine content in the lubricating oil composition is decreased so as to keep the exhaust gas from being contaminated with dioxine.
- the diesel engines employed overland for motor cars, construction machines and electric generators have been operated generally using a fuel oil (light oil or heavy oil) having a sulfur content of approximately 0.005 wt.% or more and a lubricating oil composition having a sulfated ash content of approximately 1.3 to 2 wt.%, a sulfur content of approximately 0.3 to 0.7 wt.%, and a phosphorus content of approximately 0.1 to 0.13 wt.%.
- a fuel oil light oil or heavy oil
- a lubricating oil composition having a sulfated ash content of approximately 1.3 to 2 wt.%, a sulfur content of approximately 0.3 to 0.7 wt.%, and a phosphorus content of approximately 0.1 to 0.13 wt.%.
- JPA 2002-53888 discloses a lubricating oil composition which satisfies the recent requirements of low sulfated ash content, low phosphorus content, low sulfur content and low chlorine content, which is employable for diesel engines operated using a fuel oil having a low sulfur content.
- JPA 2002-53888 discloses a lubricating oil composition having a sulfur content of 0.01 to 0.3 wt.%, and a phosphorus content of 0.01 to 0.1 wt.%, and giving a sulfated ash in the range of 0.1 to 1 wt.%, which comprises:
- a preferred metal-containing detergent is an alkali metal salt or an alkaline earth metal salt of unsulfurized alkylsalicylic acid having an alkyl group having a mean carbon atom number of approximately 8 to 30.
- the lubricating oil according to DH-2-08 for trucks and buses equipped with a post-treatment apparatus for complying with the exhaust gas regulation ought to have a sulfated ash content of 1.0 ⁇ 0.1 wt.%, a phosphorus content of not more than 0.12 wt.%, a sulfur content of not more than 0.5 wt.% and a chlorine content of not more than 150 ppm.
- the present inventors have studied the lubricating oil composition described in JPA 2002-53888 for improving the high temperature detergency attained by the disclosed lubricating oil composition and found that the improved high temperature detergency at temperatures of 300°C or higher is accomplished by a lubricating oil composition in which an unsulfurized calcium alkylsalicylate detergent having an alkyl group having 14 to 18 carbon atoms is employed for the unsulfurized alkaline earth metal alkylsalicylate having an alkyl group having a mean carbon atom number of approximately 8 to 30.
- the so formulated lubricating oil composition shows a satisfactorily good anti-wear performance and a satisfactorily low viscosity at low temperatures so that the lubricating oil composition is favorably employable in cold districts.
- the present invention has been made on this finding by the present inventors.
- the present invention resides in a lubricating oil composition for lubricating an internal combustion engine which is operated by the use of a fuel oil having a sulfur content of not more than 0.005 wt.%, particularly not more than 0.001 wt.%, comprising the following components a) to d) dissolved or dispersed in a base oil having a sulfur content of not more than 0.1 wt.%, preferably not more than 0.03 wt.%, and has a sulfated ash content in a range of 0.1 to 1.1 wt.%, a phosphorus content in a range of 0.01 to 0.12 wt.%, a sulfur content in a range of 0.01 to 0.5 wt.% and a chlorine content of not more than 150 ppm:
- the lubricating oil composition of the invention has a low sulfated ash content, a low phosphorus content and a low sulfur content similar to those of the lubricating oil composition disclosed in the aforementioned JPA 2002-53888 but shows an improved high temperature detergency at temperatures of 300°C or higher. Further, the lubricating oil composition of the invention shows a satisfactorily good anti-wear performance. Furthermore, the lubricating oil composition of the invention shows a satisfactorily low viscosity at low temperatures, so that the lubricating oil composition can be favorably employed in cold districts.
- the lubricating oil composition of the invention is particularly favorably employable for lubricating diesel engines which are mounted onto motor cars equipped with exhaust gas cleaning apparatus such as a particulate filter and an oxidation catalyst and which are operated in cold districts, using a hydrocarbon fuel oil having a sulfur content of not more than approx. 0.005 wt.%, specifically not more than approx. 0.001 wt.%.
- the invention further resides in a method for operating a diesel engine by the use of a fuel oil having a sulfur content of not more than 0.005 wt.%, specifically not more than 0.001 wt.%., and a lubricating oil composition of the invention, the diesel engine being mounted on an overland-running vehicle.
- the base oil employable for the lubricating oil composition generally is a mineral oil or a synthetic oil having a kinetic viscosity of 2 to 50 mm 2 /s at 100°C and the sulfur content is not more than 0.1 wt.%, preferably not more than 0.03, more preferably not more than 0.005 wt.%.
- the mineral oil can be produced by processing a lubricating oil grade distillate by solvent refining and/or hydrotreating or hydrocracking.
- a super-hydrogenating base oil such as, a base oil having a viscosity index in the range of 100 to 150, an aromatic content of 5 wt.% or lower, and nitrogen and sulfur contents of 50 ppm or lower.
- a high viscosity index base oil having a viscosity index of 140-160 which is obtainable by hydrogenation and isomerization of slack wax or GTL wax.
- a synthetic oil can be poly- ⁇ -olefin, namely a polymer of ⁇ -olefin having a carbon atom number of 3-12; dialkyl esters which are esters of a dibasic acid such as sebacic acid, azelaic acid or adipic acid with an alcohol having a carbon atom number of 4-18, for instance, dioctyl sebacate; polyol esters of 1-trimethylolpropane or pentaerithritol with a monobasic acid having a carbon atom number of 3-18; or an alkylbenzene having an alkyl group having a carbon atom number of 9-40.
- the synthetic oil is favorably employable, because the synthetic oil generally has almost no sulfur content and shows high oxidation stability and high thermal stability at high temperatures, and further produces less amounts of residual carbonaceous material and soots.
- the mineral base oil and synthetic base oil can be employed singly. However, a combination of two or more mineral base oils and a combination of two or more synthetic base oils can be employed. In addition, a mineral base oil and a synthetic base oil can be employed in combination in an optionally determined ratio.
- the ashless dispersant employed in the lubricating oil composition of the invention as the component b) can be an alkenylsuccinimide, an alkylsuccinimide, or a derivative thereof, in which the alkenyl group and alkyl group can be derived from polyolefin.
- the ashless dispersant is incorporated into the lubricating oil composition in an amount of 0.01 to 0.3 wt.% in terms of the nitrogen content. The percent is given per the amount of the lubricating oil composition.
- a representative succinimide can be obtained by the reaction between succinic anhydride having a substituent group of a high molecular weight alkenyl or alkyl with a polyalkylene polyamine having a mean nitrogen atom number of 4 to 10, preferably 5 to 7.
- the high molecular weight alkenyl or alkyl is preferably derived from polybutene having a number average molecular weight of approx. 900 to 3,000.
- the succinimide can be post-treated with boric acid, a boron-containing compound, alcohol, aldehyde, ketone, alkylphenol, cyclic carbonate or an organic acid.
- a borated alkenyl- (or alkyl-) succinimide which is obtained by the post-treatment with boric acid or a boron-containing compound and which shows high thermal stability and high oxidation stability.
- the alkenyl- or alkyl-succinimide or its derivative is necessarily contained.
- other ashless dispersants such as alkenylbenzyl compounds or alkenylsuccinic esters can be employed in combination with the alkenyl- or alkylsuccinimide or its derivative.
- the calcium alkylsalicylate detergent of the component b) necessarily contained in the lubricating oil composition of the invention contains an organic acid calcium salt to give the lubricating oil composition containing the organic acid calcium salt in an amount of 0.2 to 7 wt.%, preferably 0.5 to 5 wt.%, more preferably 1.0 to 3 wt.%, and comprises an unsulfurized calcium alkylsalicylate detergent having an alkyl group having 14 to 18 carbon atoms.
- the "unsulfurized calcium alkylsalicylate detergent having an alkyl group having 14 to 18 carbon atoms" is used to mean an unsulfurized calcium alkylsalicylate detergent having an alkyl group in which at least 90 molar % of the alkyl group has 14 to 18 carbon atoms.
- an unsulfurized calcium alkylsalicylate detergent having an alkyl group having 20 to 28 carbon atoms can be used in combination with the unsulfurized calcium alkylsalicylate detergent having an alkyl group having 14 to 18 carbon atoms.
- the "unsulfurized calcium alkylsalicylate detergent having an alkyl group having 20 to 28 carbon atoms" is used to mean an unsulfurized calcium alkylsalicylate detergent having an alkyl group in which at least 90 molar % of the alkyl group has 20 to 28 carbon atoms.
- the unsulfurized calcium alkylsalicylate detergent preferably is a calcium alkylsalicylate prepared from an alkyl phenol (which is prepared from ⁇ -olefin having the desired carbon atom number and phenol) by way of Kolbe-Schmitt reaction.
- an overbased calcium salicylate which is obtained by way of the carbonation process using slaked lime and carbon dioxide gas for overbasing is used as the calcium salicylate detergent.
- the calcium alkylsalicylate can be directly produced by carbonizing an alkylphenol calcium salt obtained by direct neutralization.
- the metal-containing detergent may contain a small amount of an organic acid having a carbon-nitrogen bonding or an alkali metal salt or an alkaline earth metal salt of a phenol derivative.
- a metal-containing detergent can have an increased base number by attaching an amine compound by reaction so that the base number derived by the basic nitrogen atom of the amine compound can contribute increase of the base number of the detergent. Therefore, a metal-containing detergent having a low sulfated ash but a high base number can be obtained.
- various compounds such as a metal salt of an aminocarboxylic acid.
- an unsulfurized alkylphenate (alkali metal salt or alkaline earth metal salt) having a Mannich base structure This compound can be prepared from an alkylphenol, formaldehyde, and an amine or an aminated compound via Mannich reaction to as to aminomethylate the phenol ring and subsequently neutralizing the reaction product with a base such as calcium hydroxide.
- sulfonates such as alkali metal salts or alkaline earth metal salts of petroleum sulfonic acid, alkylbenzenesulfonic acid or alkyltoluenesulfonic acid can be employed in combination with the alkylsalicylate detergent.
- the sulfurized phenate which has been used for the conventional diesel engine oils is an alkali metal salt or an alkaline earth metal salt of a sulfurized alkylphenol. Typically, calcium salt and magnesium salt are employed.
- the sulfurized phenate shows high thermal stability but generally has a high sulfur content such as approx. 3 wt.% or more, which is brought about by the sulfurization reaction. In the invention, a small amount of the sulfurized phenate may be employed in combination with the alkylsalicylate detergent.
- the two calcium alkylsalicylate detergents can be incorporated in combination under the condition that the organic acid calcium salts contained in these detergents are incorporated to give a lubricating oil composition containing the organic acid calcium salt in an amount of 0.2 to 7 wt.%, preferably 0.5 to 5 wt.%, more preferably 1.0 to 3 wt.%, based on the amount of the lubricating oil composition.
- the amount of the organic acid calcium salt can be adjusted by adjusting the content of the organic acid calcium salt in the detergent and/or adjusting the amount of the detergent to be incorporated into the lubricating oil composition.
- the calcium alkylsalicylate detergent is an oily dispersion comprising an organic acid calcium salt (generally referred to as "soap content") and aggregated basic inorganic salt particles (typically calcium carbonate particles) surrounding the organic calcium salt dispersed in the oily medium (generally contained in an amount of approx. 25 to 55 wt.%).
- the amount of the organic acid calcium salt in the lubricating oil composition is important for keeping the high temperature detergency (ability for keeping the inside of the engine operated at high temperatures clean) at a high level.
- the zinc phosphate anti-wear agent of the component c) is selected from the group consisting of a zinc dialkyldithiophosphate and a zinc dihydrocarbylphosphate.
- the zinc phosphate anti-wear agent is employed in an amount of 0.01 to 0.12 wt.% in terms of a phosphorus content. However, the amount preferably is in the range of 0.01 to 0.06, so as to decrease the phosphorus content and sulfur content in the lubricating oil composition.
- the zinc dialkyldithiophosphate preferably has an alkyl group having a carbon atom number of 3 to 18 or an alkylaryl group having an alkyl group of a carbon atom number of 3 to 18. Particularly preferred is a zinc dialkyldithiophosphate having an alkyl group derived from a secondary alcohol having a carbon atom number of 3 to 18 or having an alkyl group mixture derived from a mixture of a primary alcohol having a carbon atom number of 3 to 18 and a secondary alcohol having a carbon atom number of 3 to 18, both of which bring about very good anti-wear performance.
- the zinc dialkyldithiophosphate derived from the primary alcohol shows high thermal stability. These zinc dithiophosphates can be employed alone but can be employed in combination which mainly comprise one derived from the secondary alcohol and one derived from the primary alcohol.
- the lubricating oil composition of the present invention further contains an oxidation-inhibiting phenol compound and/or an oxidation-inhibiting amine compound in an amount of 0.01 to 5 wt.%, preferably in an amount of 0.1 to 3 wt.%.
- a lubricating oil composition having a low sulfated ash content, a low phosphorus content and a low sulfur content contains decreased amounts of a metal-containing detergent and a zinc dithiophosphate, and hence shows decreases in high temperature detergency, oxidation stability and wear resistance. In order to improve these decreases, it is required to incorporate the component d) into the lubricating oil composition.
- the component d) preferably is a diarylamine oxidation inhibitor and/or a hindered phenol oxidation inhibitor.
- the incorporation of these oxidation inhibitor is effective to improve the high temperature detergency.
- the diarylamine oxidation inhibitor is preferred because it shows a base number derived from the contained nitrogen.
- the hindered phenol oxidation inhibitor is preferred because it efficiently inhibit oxidation caused by NO x .
- hindered phenol oxidation inhibitors examples include 2,6-di-t-butyl-p-cresol, 4,4'-methylenebis(2,6-di-t-butylphenol), 4,4'-methylenebis(6-t-butyl-o-cresol), 4,4'-isopropylidenebis(2,6-di-t-butylphenol), 4,4'-bis-(2,6-di-t-butylphenol), 2, 2'-methylenebis(4-methyl-6-t-butylphenol), 4,4'-thiobis(2-methyl-6-t-butylphenol), 2,2-thio-diethylenebis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], octyl 3-(3,5-di-t-butyl-4-hydroxyphenyl)-propionate and octadecyl 3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate
- diarylamine oxidation inhibitors examples include an alkyldiphenylamine having a mixed alkyl group having 4 to 9 carbon atoms, p,p'-dioctyldiphenylamine, phenyl- ⁇ -naphthylamine, phenyl- ⁇ -naphthylamine, alkylated ⁇ -naphthylamine, and alkylated phenyl- ⁇ -naphthylamine.
- Each of the hindered phenol oxidation inhibitor and diarylamine oxidation inhibitor can be employed alone or in combination.
- other oil-soluble oxidation inhibitors can be used in combination with the above-mentioned oxidation inhibitors.
- the lubricating oil composition of the present invention may further contain a multi-functional additive such as molybdenum-containing compound and/or a hydrated alkali metal borate in an amount of not more than 5 wt.%, particularly in an amount of 0.01 to 5 wt.%, per each.
- a multi-functional additive such as molybdenum-containing compound and/or a hydrated alkali metal borate in an amount of not more than 5 wt.%, particularly in an amount of 0.01 to 5 wt.%, per each.
- Most of these compounds have a sulfated ash content and a sulfur content. Therefore, the amount can be adjusted in consideration of the sulfated ash content and sulfur content of the resulting lubricating oil composition.
- the molybdenum-containing compound serves mainly as a friction modifier, an oxidation inhibitor and an anti-wear agent in the lubricating oil composition, and further serves to improve the high temperature detergency.
- the molybdenum-containing compound is preferably incorporated into the lubricating oil composition in an amount of 10 to 2,500 ppm in terms of a molybdenum metal content.
- molybdenum-containing compounds examples include sulfur-containing succinimide-molybdenum complex compounds, sulfurized oxymolybdenum dithiocarbamates, sulfurized oxymolybdenum dithiophosphates, an amine-molybdenum complex compound, oxymolybdenum diethylatetamides, and oxymolybdenum monoglycerides.
- succinimide-molybdenum complex compound is effective to give improved high temperature detergency.
- the hydrated alkali metal borate is effective in giving improved high temperature detergency and increased base number to the lubricating oil composition.
- the hydrated alkali metal borate can be prepared by the processes disclosed U.S. Patent Nos. 3,929,650 and 4,089,790 .
- Preferred is a dispersion in which micro particles of an alkali metal borate are dispersed which can be prepared by carbonizing neutral alkali metal or alkaline earth metal sulfonate in the presence of an alkali metal hydroxide to give an overbased sulfonate and reacting the overbased sulfonate with boric acid.
- an ashless dispersant such as succinimide is preferably present in the reaction mixture.
- the alkali metal preferably is potassium or sodium.
- particles of a product having a constitutional formula of KB 3 O 5 •H 2 O and a mean diameter of approximately 0.3 ⁇ m or less which are dispersed in a mixture of neutral calcium sulfonate and succinimide detergent can be mentioned.
- potassium can be replaced with sodium.
- the lubricating oil composition of the present invention preferably contains a viscosity index improver in an amount of 20 wt.% or less, more preferably in an amount of 1 to 20 wt.%.
- the viscosity index improvers include polymers such as polyalkyl methacrylate, ethylene-propylene copolymer, styrenebutadiene copolymer and polyisoprene.
- the viscosity index improver can be employed singly or in combination.
- the lubricating oil composition of the present invention can further contain a variety of auxiliary additives.
- auxiliary additives include zinc dithiocarbamate, methylenebis(dibutyldithiocarbamate), an oil-soluble copper compound, a sulfur compound (such as sulfurized olefin, sulfurized ester or polysulfide), phosphate ester, phosphite ester, and organic amide compounds (e.g., oleylamide), which can serve as oxidation inhibitors or anti-wear agents.
- benzotriazole compounds and thiadiazole compounds which serve as metalinactivaters can be incorporated.
- a polyoxyalkylene type nonionic surfactant such as polyoxyethylene alkylphenyl ether or a copolymer of ethylene oxide and propylene oxide, which serves as a rust inhibitor or an anti-emulsifier.
- various amines, amides, amine salts or their derivatives, or fatty acid esters of a polyvalent alcohol or their derivatives, which can serve as friction modifiers can be incorporated.
- a variety of compounds which can serve as defoaming agents or pour point depressants can be incorporated.
- These auxiliary additives are preferably incorporated into the lubricating oil composition in an amount of not more than 3 wt.%, preferably in an amount of 0.001 to 3 wt.%.
- the lubricating oil compositions for evaluating their performances were prepared from the below-mentioned base oil and additives, to give lubricating oil composition having a sulfated ash content of 1.0 wt.%, a phosphorus content of 0.09 wt.%, a sulfur content of 0.2 wt.% and a chlorine content of less than 5 ppm.
- a viscosity index improver to have a viscosity grade (SAE viscosity grade) of 5W30.
- Base oil A Super-hydrogenated base oil (kinematic viscosity at 100°C: 4.0 mm 2 /s, viscosity index: 123, sulfur content: less than 0.001 wt.%)
- Base oil B Super-hydrogenated base oil (kinematic viscosity at 100°C: 6.5 mm 2 /s, viscosity index: 132, sulfur content: less than 0.001 wt.%)
- Dispersant A Ethylene carbonate post-treated succinimide dispersant (nitrogen content: 0.85 wt.%, chlorine content: 30 wt.ppm) prepared according to the procedure described in Example 17 of JP 7-150166 A , by the steps of reacting polybutene having a number average molecular weight of approx. 2,200 with maleic anhydride under the thermal reaction conditions; reacting the reaction product with polyalkylenepolyamine having an average nitrogen atom number of 6.5 (per molecule) to give bis-type succinimide, and treating the succinimide with ethylene carbonate: 0.0085 wt.% (amount in terms of nitrogen content)
- Dispersant B Boron-containing succinimide dispersant (nitrogen content: 1.5 wt.%, boron content: 0.5 wt.%, chlorine content: less than 5 wt.ppm) prepared according to the procedure described in Example 8 of JP 7-150166 A , by the steps of reacting polybutene having a number average molecular weight of approx. 1,300 with maleic anhydride under the thermal reaction conditions; reacting the reaction product with polyalkylenepolyamine having an average nitrogen atom number of 6.5 (per molecule) to give bis-type succinimide, and treating the succinimide with boric acid: 0.06 wt.% (amount in terms of nitrogen content).
- Calcium alkylsalicylate detergent (described hereinafter in Examples 1 to 4 and Comparison Example 1): 0.82 wt.% (amount in terms of sulfated ash content)
- ZnDTP Zinc dialkyldithiophosphate (P: 7.2 wt.%, Zn: 7.85 wt.%, S: 14.4 wt.%, derived from secondary alcohol having 3 to 8 carbon atoms): 0.09 wt.% (amount in terms of P content)
- Oxidation inhibitor A Amine compound (dialkyldiphenylamine (alkyl: mixture of C 4 alkyl and C 8 alkyl), N: 4.6 wt.%, TBN: 180 mg KOH/g): 0.7 wt.%
- Oxidation inhibitor B Phenolic compound (octyl 3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate): 0.7 wt.%
- Mo-containing compound Sulfurized oxymolybdenumsuccinimide complex compound (Mo: 5.4 wt.%, S: 3.7 wt.%, TBN: 45 mg KOH/g): 0.85 wt.%
- Viscosity index improver Non-dispersant type ethylene-propylene copolymer, Paratone 8057
- a lubricating oil composition (TBN: 9.6 mg KOH/g, organic acid calcium salt content: 1.5 wt.%) was prepared using the following calcium alkylsalicylate detergent:
- a lubricating oil composition (TBN: 9.6 mg KOH/g, organic acid calcium salt content: 1.5 wt.%) was prepared using the following calcium alkylsalicylate detergent:
- a lubricating oil composition (TBN: 9.6 mg KOH/g, organic acid calcium salt content: 1.2 wt.%) was prepared using the following calcium alkylsalicylate detergent:
- the detergent was subjected to the conventional dialysis using rubber membrane to separate mineral oil and low molecular weight components out.
- the remaining residue (A) was an effective detergent component.
- the carbon dioxide content of the detergent was determined.
- the content of calcium carbonate overbasing component content (B) was determined.
- the organic acid calcium salt was calculated by subtracting (B) from (A).
- the lubricating oil composition was subjected to the below-mentioned hot tube test (KES-07-803) at 300°C and 305°C.
- a glass tube (inner diameter: 2 mm) was placed in a heater block vertically.
- the lubricating oil composition and air were supplied from the bottom of the tube at rates of 0.31 cc/hr. and 10 cc/min., respectively.
- the supply was continued for 16 hours maintaining the heater block at the predetermined temperature.
- the glass tube was taken out and examined for deposition produced on the inner surface of the tube. The evaluation was performed on the basis of 10 points (maximum). The 10 point means that no deposition was observed.
- the low temperature viscosity (cP) was determined by means of the MRV viscometer (described in ASTM D4684) at -35°C.
- the lubricating oil compositions according to the invention (Examples 1 and 2) containing the calcium alkylsalicylate having an alkyl group having 14 to 18 carbon atoms gave improved high temperature detergency under very severe temperature conditions such as 300°C and 305°C, and further showed a low viscosity at the low temperature.
- a lubricating oil composition (TBN: 9.6 mg KOH/g, organic acid calcium salt content: 1.1 wt.%) was prepared using a 1:1 mixture (in terms of calcium content ratio) of the following two calcium alkylsalicylate detergents:
- a lubricating oil composition (TBN: 9.6 mg KOH/g, organic acid calcium salt content: 1.1 wt.%) was prepared using a 1:1 mixture (in terms of calcium content ratio) of the following two calcium alkylsalicylate detergents:
- the lubricating oil compositions according to the invention (Examples 3 and 4) containing the two calcium alkylsalicylates having alkyl groups having different carbon atom numbers gave improved high temperature detergency under very severe temperature conditions such as 300°C and 305°C, and further showed a low viscosity at the low temperature.
Abstract
Description
- This application claims priority to Japanese Patent Application number
JP 2010-201230 which was filed on September 8, 2010 - The present invention relates to a lubricating oil composition favorably employable for lubricating an internal combustion engine operated overland such as a diesel engine, a gasoline engine or a gas engine. In more detail, the invention relates to a lubricating oil composition for internal combustion engines which has a low sulfated ash content, a low phosphorus content and a low sulfur content and shows good high temperature detergency and anti-wear performance, and which gives less adverse effects to an exhaust gas cleaning apparatus such as a particulate filter or an oxidation catalyst mounted on a car for oxidizing unburnt soot, fuel and lubricating oil contained in exhausted gas, so that the lubricating oil composition can comply with the recently adopted severe exhaust gas requirements and further can comply with more severe exhaust gas requirements which are probably adopted in future.
- In particular, the invention provides an environment friendly lubricating oil composition for internal combustion engines which is favorably employable with vehicles operated using hydrocarbon fuel oil having a sulfur content of not more than approximately 0.005 wt.%, particularly not more than approximately 0.001 wt.%, specifically diesel engine-mounted vehicles equipped with exhaust gas-cleaning apparatuses such as a particulate filter and an oxidation catalyst.
- Recently, it has become very important for overland-running diesel engine mounted vehicles to reduce environmental pollution caused by exhaust gas components such as particulates and NOx. It is known that the pollution can be reduced by mounting exhaust gas-cleaning apparatuses such as a particulate filter and an oxidation catalyst onto the vehicles. It is noted, however, that the particulate filter is plugged with metal oxides, sulfated ash and carboxylic acids produced by the combustion of the conventional lubricating oil compositions having a high sulfated ash content, a high phosphorus content and a high sulfur content, though the soot adsorbed on the filter are removed by oxidation and burning in the exhaust gas cleaning apparatus.
- In addition, it is now required to reduce the sulfur content in a fuel oil because the sulfur in the fuel oil is burnt to produce unfavorable products such as sulfuric acid and sulfate in the exhaust gas which gives adverse effects to the oxidation catalyst. For instance, the sulfur content of diesel fuel oils for diesel engine-mounted vehicles has decreased from not more than approximately 0.005 wt.% to not more than approximately 0.001 wt.%. When the sulfur content in the fuel oil decreases, the content of the metal-containing detergent serving for neutralizing the sulfuric acid or the like in the lubricating oil composition can be decreased. It is known that a portion of the lubricating oil composition is burnt in the engine and incorporated into the exhaust gas. Therefore, it is preferred that the metal content and sulfur content in the lubricating oil composition be as low as possible. Moreover, it is preferred that the phosphorus content in the lubricating oil composition is decreased so as to keep the catalyst from deteriorating. Furthermore, it is preferred that the chlorine content in the lubricating oil composition is decreased so as to keep the exhaust gas from being contaminated with dioxine.
- Heretofore, the diesel engines employed overland for motor cars, construction machines and electric generators have been operated generally using a fuel oil (light oil or heavy oil) having a sulfur content of approximately 0.005 wt.% or more and a lubricating oil composition having a sulfated ash content of approximately 1.3 to 2 wt.%, a sulfur content of approximately 0.3 to 0.7 wt.%, and a phosphorus content of approximately 0.1 to 0.13 wt.%.
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JPA 2002-53888 US 2002/0019320 A1 ) discloses a lubricating oil composition which satisfies the recent requirements of low sulfated ash content, low phosphorus content, low sulfur content and low chlorine content, which is employable for diesel engines operated using a fuel oil having a low sulfur content. In more detail,JPA 2002-53888 - a) a major amount of a mineral base oil having a sulfur content of at most 0.1 wt.%, preferably at most 0.03 wt.%;
- b) an ashless dispersant comprising an alkenyl- or alkyl-succinimide or a derivative thereof in an amount of 0.01 to 0.3 wt.% in terms of a nitrogen atom content;
- c) a metal-containing detergent containing an organic acid metal salt which is selected from the group consisting of a non-sulfurized alkali metal or alkaline earth metal salt of an alkylsalicylic acid having a TBN of 10 to 350 mg KOH/g and a non-sulfurized alkali metal or alkaline earth metal salt of an alkylphenol derivative having a Mannich base structure, in an amount of 0.1 to 1 wt.% in terms of a sulfated ash content;
- d) a zinc dialkyldithiophosphate in an amount of 0.01 to 0.1 wt.% in terms of a phosphorus content; and
- e) an oxidation inhibitor selected from the group consisting of a phenol compound and an amine compound in an amount of 0.01 to 5 wt.%,
- It is further described that a preferred metal-containing detergent is an alkali metal salt or an alkaline earth metal salt of unsulfurized alkylsalicylic acid having an alkyl group having a mean carbon atom number of approximately 8 to 30.
- In the recently established JASO M 355:2008 (for lubricating oil for automotive diesel engines), it is described that the lubricating oil according to DH-2-08 for trucks and buses equipped with a post-treatment apparatus for complying with the exhaust gas regulation ought to have a sulfated ash content of 1.0±0.1 wt.%, a phosphorus content of not more than 0.12 wt.%, a sulfur content of not more than 0.5 wt.% and a chlorine content of not more than 150 ppm.
- It is an object of the present invention to provide a lubricating oil composition for internal combustion engines, which satisfies the requirements of the above-mentioned JASO M 355:2008 and shows improved high temperature detergency at 300°C or higher, as compared with the lubricating oil composition disclosed in the aforementioned
JPA 2002-53888 - The present inventors have studied the lubricating oil composition described in JPA 2002-53888 for improving the high temperature detergency attained by the disclosed lubricating oil composition and found that the improved high temperature detergency at temperatures of 300°C or higher is accomplished by a lubricating oil composition in which an unsulfurized calcium alkylsalicylate detergent having an alkyl group having 14 to 18 carbon atoms is employed for the unsulfurized alkaline earth metal alkylsalicylate having an alkyl group having a mean carbon atom number of approximately 8 to 30. The so formulated lubricating oil composition shows a satisfactorily good anti-wear performance and a satisfactorily low viscosity at low temperatures so that the lubricating oil composition is favorably employable in cold districts. The present invention has been made on this finding by the present inventors.
- Accordingly, the present invention resides in a lubricating oil composition for lubricating an internal combustion engine which is operated by the use of a fuel oil having a sulfur content of not more than 0.005 wt.%, particularly not more than 0.001 wt.%, comprising the following components a) to d) dissolved or dispersed in a base oil having a sulfur content of not more than 0.1 wt.%, preferably not more than 0.03 wt.%, and has a sulfated ash content in a range of 0.1 to 1.1 wt.%, a phosphorus content in a range of 0.01 to 0.12 wt.%, a sulfur content in a range of 0.01 to 0.5 wt.% and a chlorine content of not more than 150 ppm:
- a) an ashless dispersant in an amount of 0.01 to 0.3 wt.% in terms of a nitrogen content, the ashless dispersant being selected from the group consisting of an alkenyl succinimide, an alkyl succinimide, or derivatives thereof;
- b) a calcium alkylsalicylate detergent in an amount of 0.1 to 1 wt.% in terms of a sulfated ash content, the calcium alkylsalicylate detergent having a sulfur content of not more than 3 wt.% and a total base number in the range of 10 to 350 mg KOH/g, containing an organic acid calcium salt under the condition that the lubricating oil composition contains the organic acid calcium salt in an amount of 0.2 to 7 wt.%, preferably 0.5 to 5 wt.%, more preferably 1.0 to 3 wt.%, based on the amount of the oil composition, and comprising an unsulfurized calcium alkylsalicylate detergent having an alkyl group having 14 to 18 carbon atoms;
- c) a zinc phosphate anti-wear agent in an amount of 0.01 to 0.12 wt.% in terms of a phosphorus content, the zinc phosphate being selected from the group consisting of a zinc dialkyldithiophosphate and a zinc dihydrocarbylphosphate, and
- d) an oxidation inhibitor in an amount of 0.01 to 5 wt.%, the oxidation inhibitor being selected from the group consisting of an oxidation inhibiting phenol compound and an oxidation inhibiting amine compound,
- The lubricating oil composition of the invention has a low sulfated ash content, a low phosphorus content and a low sulfur content similar to those of the lubricating oil composition disclosed in the aforementioned
JPA 2002-53888 - Therefore, the lubricating oil composition of the invention is particularly favorably employable for lubricating diesel engines which are mounted onto motor cars equipped with exhaust gas cleaning apparatus such as a particulate filter and an oxidation catalyst and which are operated in cold districts, using a hydrocarbon fuel oil having a sulfur content of not more than approx. 0.005 wt.%, specifically not more than approx. 0.001 wt.%.
- The preferred embodiments of the invention are set forth below.
- (1) The calcium alkylsalicylate detergent of the component b) has a total base number in the range of 30 to 300 mg KOH/g.
- (2) The unsulfurized calcium alkylsalicylate detergent having an alkyl group having a carbon atom number of 14 to 18 has a total base number in the range of 100 to 250 mg KOH/g.
- (3) The ashless dispersant of the component a) comprises succinimide or a derivative thereof which is obtained by a reaction of a polybutenylsuccinic anhydride with a polyamine, the polybutenylsuccinic anhydride being obtained by a thermal reaction of polybutene and maleic anhydride in the absence of chlorine or a chlorinecontaining compound.
- (4) The lubricating oil composition contains a molybdenum-containing compound in an amount of 0.01 to 5 wt.%.
- (5) The lubricating oil composition has a total base number in the range of 1 to 17 mg KOH/g, specifically 2 to 13 mg KOH/g.
- (6) The lubricating oil composition is a multi-grade engine oil containing a viscosity index improver and is an oil of 0W5, 0W10, 0W15, 0W20, 0W30, 5W20, 5W30, 10W20, or 10W30.
- (7) The lubricating oil composition is employed for lubricating a diesel engine operated using a fuel oil having a sulfur content of not more than 0.005 wt.%, specifically not more than 0.001 wt.%, in which the diesel engine is mounted on an overland-running vehicle.
- The invention further resides in a method for operating a diesel engine by the use of a fuel oil having a sulfur content of not more than 0.005 wt.%, specifically not more than 0.001 wt.%., and a lubricating oil composition of the invention, the diesel engine being mounted on an overland-running vehicle.
- The base oil employable for the lubricating oil composition generally is a mineral oil or a synthetic oil having a kinetic viscosity of 2 to 50 mm2/s at 100°C and the sulfur content is not more than 0.1 wt.%, preferably not more than 0.03, more preferably not more than 0.005 wt.%.
- The mineral oil can be produced by processing a lubricating oil grade distillate by solvent refining and/or hydrotreating or hydrocracking. Preferably employed is a super-hydrogenating base oil, such as, a base oil having a viscosity index in the range of 100 to 150, an aromatic content of 5 wt.% or lower, and nitrogen and sulfur contents of 50 ppm or lower. Particularly preferred is a high viscosity index base oil having a viscosity index of 140-160 which is obtainable by hydrogenation and isomerization of slack wax or GTL wax.
- A synthetic oil (synthetic base oil) can be poly-α-olefin, namely a polymer of α-olefin having a carbon atom number of 3-12; dialkyl esters which are esters of a dibasic acid such as sebacic acid, azelaic acid or adipic acid with an alcohol having a carbon atom number of 4-18, for instance, dioctyl sebacate; polyol esters of 1-trimethylolpropane or pentaerithritol with a monobasic acid having a carbon atom number of 3-18; or an alkylbenzene having an alkyl group having a carbon atom number of 9-40. The synthetic oil is favorably employable, because the synthetic oil generally has almost no sulfur content and shows high oxidation stability and high thermal stability at high temperatures, and further produces less amounts of residual carbonaceous material and soots.
- The mineral base oil and synthetic base oil can be employed singly. However, a combination of two or more mineral base oils and a combination of two or more synthetic base oils can be employed. In addition, a mineral base oil and a synthetic base oil can be employed in combination in an optionally determined ratio.
- The ashless dispersant employed in the lubricating oil composition of the invention as the component b) can be an alkenylsuccinimide, an alkylsuccinimide, or a derivative thereof, in which the alkenyl group and alkyl group can be derived from polyolefin. The ashless dispersant is incorporated into the lubricating oil composition in an amount of 0.01 to 0.3 wt.% in terms of the nitrogen content. The percent is given per the amount of the lubricating oil composition. A representative succinimide can be obtained by the reaction between succinic anhydride having a substituent group of a high molecular weight alkenyl or alkyl with a polyalkylene polyamine having a mean nitrogen atom number of 4 to 10, preferably 5 to 7. The high molecular weight alkenyl or alkyl is preferably derived from polybutene having a number average molecular weight of approx. 900 to 3,000.
- In the process for producing a polybutenyl succinic anhydride by the reaction of polybutene and maleic anhydride, a chlorination procedure is generally employed. However, the chlorination procedure gives a remaining chlorine in the product, and hence the finally produced succinimide inevitably contains a large amount (such as approx. 2,000 to 3,000 ppm) of the emigrated chlorine. In contrast, the thermal reaction using no chlorine gives a final product having an extremely small chlorine content (such as 0 to 30 ppm). Therefore, the succinimide derived from a polyisobutenyl succinimide obtained by the thermal reaction can be favorably employed for formulating a lubricating oil composition having a low chlorine content such as 0 to 30 wt. ppm. The succinimide can be post-treated with boric acid, a boron-containing compound, alcohol, aldehyde, ketone, alkylphenol, cyclic carbonate or an organic acid. Preferred is a borated alkenyl- (or alkyl-) succinimide which is obtained by the post-treatment with boric acid or a boron-containing compound and which shows high thermal stability and high oxidation stability.
- In the lubricating oil composition, the alkenyl- or alkyl-succinimide or its derivative is necessarily contained. However, other ashless dispersants such as alkenylbenzyl compounds or alkenylsuccinic esters can be employed in combination with the alkenyl- or alkylsuccinimide or its derivative.
- The calcium alkylsalicylate detergent of the component b) necessarily contained in the lubricating oil composition of the invention contains an organic acid calcium salt to give the lubricating oil composition containing the organic acid calcium salt in an amount of 0.2 to 7 wt.%, preferably 0.5 to 5 wt.%, more preferably 1.0 to 3 wt.%, and comprises an unsulfurized calcium alkylsalicylate detergent having an alkyl group having 14 to 18 carbon atoms. In the invention, the "unsulfurized calcium alkylsalicylate detergent having an alkyl group having 14 to 18 carbon atoms" is used to mean an unsulfurized calcium alkylsalicylate detergent having an alkyl group in which at least 90 molar % of the alkyl group has 14 to 18 carbon atoms.
- In the lubricating oil composition, an unsulfurized calcium alkylsalicylate detergent having an alkyl group having 20 to 28 carbon atoms can be used in combination with the unsulfurized calcium alkylsalicylate detergent having an alkyl group having 14 to 18 carbon atoms. The "unsulfurized calcium alkylsalicylate detergent having an alkyl group having 20 to 28 carbon atoms" is used to mean an unsulfurized calcium alkylsalicylate detergent having an alkyl group in which at least 90 molar % of the alkyl group has 20 to 28 carbon atoms.
- The unsulfurized calcium alkylsalicylate detergent preferably is a calcium alkylsalicylate prepared from an alkyl phenol (which is prepared from α-olefin having the desired carbon atom number and phenol) by way of Kolbe-Schmitt reaction. Generally, an overbased calcium salicylate which is obtained by way of the carbonation process using slaked lime and carbon dioxide gas for overbasing is used as the calcium salicylate detergent.
- Otherwise, the calcium alkylsalicylate can be directly produced by carbonizing an alkylphenol calcium salt obtained by direct neutralization.
- The metal-containing detergent may contain a small amount of an organic acid having a carbon-nitrogen bonding or an alkali metal salt or an alkaline earth metal salt of a phenol derivative. Generally, a metal-containing detergent can have an increased base number by attaching an amine compound by reaction so that the base number derived by the basic nitrogen atom of the amine compound can contribute increase of the base number of the detergent. Therefore, a metal-containing detergent having a low sulfated ash but a high base number can be obtained. For instance, there may be mentioned various compounds such as a metal salt of an aminocarboxylic acid. Particularly, there can be mentioned an unsulfurized alkylphenate (alkali metal salt or alkaline earth metal salt) having a Mannich base structure. This compound can be prepared from an alkylphenol, formaldehyde, and an amine or an aminated compound via Mannich reaction to as to aminomethylate the phenol ring and subsequently neutralizing the reaction product with a base such as calcium hydroxide.
- In addition to the heretofore described metal-containing detergents, a small amount of sulfonates such as alkali metal salts or alkaline earth metal salts of petroleum sulfonic acid, alkylbenzenesulfonic acid or alkyltoluenesulfonic acid can be employed in combination with the alkylsalicylate detergent.
- The sulfurized phenate which has been used for the conventional diesel engine oils is an alkali metal salt or an alkaline earth metal salt of a sulfurized alkylphenol. Typically, calcium salt and magnesium salt are employed. The sulfurized phenate shows high thermal stability but generally has a high sulfur content such as approx. 3 wt.% or more, which is brought about by the sulfurization reaction. In the invention, a small amount of the sulfurized phenate may be employed in combination with the alkylsalicylate detergent.
- In the lubricating oil composition of the present invention, the two calcium alkylsalicylate detergents can be incorporated in combination under the condition that the organic acid calcium salts contained in these detergents are incorporated to give a lubricating oil composition containing the organic acid calcium salt in an amount of 0.2 to 7 wt.%, preferably 0.5 to 5 wt.%, more preferably 1.0 to 3 wt.%, based on the amount of the lubricating oil composition. The amount of the organic acid calcium salt can be adjusted by adjusting the content of the organic acid calcium salt in the detergent and/or adjusting the amount of the detergent to be incorporated into the lubricating oil composition.
- It is known that the calcium alkylsalicylate detergent is an oily dispersion comprising an organic acid calcium salt (generally referred to as "soap content") and aggregated basic inorganic salt particles (typically calcium carbonate particles) surrounding the organic calcium salt dispersed in the oily medium (generally contained in an amount of approx. 25 to 55 wt.%). The amount of the organic acid calcium salt in the lubricating oil composition is important for keeping the high temperature detergency (ability for keeping the inside of the engine operated at high temperatures clean) at a high level.
- The zinc phosphate anti-wear agent of the component c) is selected from the group consisting of a zinc dialkyldithiophosphate and a zinc dihydrocarbylphosphate.
- These zinc phosphate anti-wear agents are well known, so far as their preparation methods and properties. The zinc phosphate anti-wear agent is employed in an amount of 0.01 to 0.12 wt.% in terms of a phosphorus content. However, the amount preferably is in the range of 0.01 to 0.06, so as to decrease the phosphorus content and sulfur content in the lubricating oil composition.
- The zinc dialkyldithiophosphate preferably has an alkyl group having a carbon atom number of 3 to 18 or an alkylaryl group having an alkyl group of a carbon atom number of 3 to 18. Particularly preferred is a zinc dialkyldithiophosphate having an alkyl group derived from a secondary alcohol having a carbon atom number of 3 to 18 or having an alkyl group mixture derived from a mixture of a primary alcohol having a carbon atom number of 3 to 18 and a secondary alcohol having a carbon atom number of 3 to 18, both of which bring about very good anti-wear performance. The zinc dialkyldithiophosphate derived from the primary alcohol shows high thermal stability. These zinc dithiophosphates can be employed alone but can be employed in combination which mainly comprise one derived from the secondary alcohol and one derived from the primary alcohol.
- The lubricating oil composition of the present invention further contains an oxidation-inhibiting phenol compound and/or an oxidation-inhibiting amine compound in an amount of 0.01 to 5 wt.%, preferably in an amount of 0.1 to 3 wt.%. Generally, a lubricating oil composition having a low sulfated ash content, a low phosphorus content and a low sulfur content contains decreased amounts of a metal-containing detergent and a zinc dithiophosphate, and hence shows decreases in high temperature detergency, oxidation stability and wear resistance. In order to improve these decreases, it is required to incorporate the component d) into the lubricating oil composition. The component d) preferably is a diarylamine oxidation inhibitor and/or a hindered phenol oxidation inhibitor. The incorporation of these oxidation inhibitor is effective to improve the high temperature detergency. From one aspect, the diarylamine oxidation inhibitor is preferred because it shows a base number derived from the contained nitrogen. From other aspect, the hindered phenol oxidation inhibitor is preferred because it efficiently inhibit oxidation caused by NOx.
- Examples of the hindered phenol oxidation inhibitors include 2,6-di-t-butyl-p-cresol, 4,4'-methylenebis(2,6-di-t-butylphenol), 4,4'-methylenebis(6-t-butyl-o-cresol), 4,4'-isopropylidenebis(2,6-di-t-butylphenol), 4,4'-bis-(2,6-di-t-butylphenol), 2, 2'-methylenebis(4-methyl-6-t-butylphenol), 4,4'-thiobis(2-methyl-6-t-butylphenol), 2,2-thio-diethylenebis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], octyl 3-(3,5-di-t-butyl-4-hydroxyphenyl)-propionate and octadecyl 3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate.
- Examples of the diarylamine oxidation inhibitors include an alkyldiphenylamine having a mixed alkyl group having 4 to 9 carbon atoms, p,p'-dioctyldiphenylamine, phenyl-α-naphthylamine, phenyl-β-naphthylamine, alkylated α-naphthylamine, and alkylated phenyl-α-naphthylamine.
- Each of the hindered phenol oxidation inhibitor and diarylamine oxidation inhibitor can be employed alone or in combination. Optionally, other oil-soluble oxidation inhibitors can be used in combination with the above-mentioned oxidation inhibitors.
- The lubricating oil composition of the present invention may further contain a multi-functional additive such as molybdenum-containing compound and/or a hydrated alkali metal borate in an amount of not more than 5 wt.%, particularly in an amount of 0.01 to 5 wt.%, per each. Most of these compounds have a sulfated ash content and a sulfur content. Therefore, the amount can be adjusted in consideration of the sulfated ash content and sulfur content of the resulting lubricating oil composition.
- The molybdenum-containing compound serves mainly as a friction modifier, an oxidation inhibitor and an anti-wear agent in the lubricating oil composition, and further serves to improve the high temperature detergency. The molybdenum-containing compound is preferably incorporated into the lubricating oil composition in an amount of 10 to 2,500 ppm in terms of a molybdenum metal content. Examples of the molybdenum-containing compounds include sulfur-containing succinimide-molybdenum complex compounds, sulfurized oxymolybdenum dithiocarbamates, sulfurized oxymolybdenum dithiophosphates, an amine-molybdenum complex compound, oxymolybdenum diethylatetamides, and oxymolybdenum monoglycerides. Particularly, the succinimide-molybdenum complex compound is effective to give improved high temperature detergency.
- The hydrated alkali metal borate is effective in giving improved high temperature detergency and increased base number to the lubricating oil composition. The hydrated alkali metal borate can be prepared by the processes disclosed
U.S. Patent Nos. 3,929,650 and4,089,790 . Preferred is a dispersion in which micro particles of an alkali metal borate are dispersed which can be prepared by carbonizing neutral alkali metal or alkaline earth metal sulfonate in the presence of an alkali metal hydroxide to give an overbased sulfonate and reacting the overbased sulfonate with boric acid. In the carbonation reaction, an ashless dispersant such as succinimide is preferably present in the reaction mixture. The alkali metal preferably is potassium or sodium. In more detail, particles of a product having a constitutional formula of KB3O5•H2O and a mean diameter of approximately 0.3 µm or less which are dispersed in a mixture of neutral calcium sulfonate and succinimide detergent can be mentioned. In consideration of resistance to water, potassium can be replaced with sodium. - The lubricating oil composition of the present invention preferably contains a viscosity index improver in an amount of 20 wt.% or less, more preferably in an amount of 1 to 20 wt.%. Examples of the viscosity index improvers include polymers such as polyalkyl methacrylate, ethylene-propylene copolymer, styrenebutadiene copolymer and polyisoprene. A dispersant type viscosity index improver or a multi-functional viscosity index improver obtained by attaching a dispersable group to the viscosity index improving polymer. The viscosity index improver can be employed singly or in combination.
- The lubricating oil composition of the present invention can further contain a variety of auxiliary additives. Examples of the auxiliary additives include zinc dithiocarbamate, methylenebis(dibutyldithiocarbamate), an oil-soluble copper compound, a sulfur compound (such as sulfurized olefin, sulfurized ester or polysulfide), phosphate ester, phosphite ester, and organic amide compounds (e.g., oleylamide), which can serve as oxidation inhibitors or anti-wear agents. Further, benzotriazole compounds and thiadiazole compounds which serve as metalinactivaters can be incorporated. Furthermore, a polyoxyalkylene type nonionic surfactant such as polyoxyethylene alkylphenyl ether or a copolymer of ethylene oxide and propylene oxide, which serves as a rust inhibitor or an anti-emulsifier. Furthermore, various amines, amides, amine salts or their derivatives, or fatty acid esters of a polyvalent alcohol or their derivatives, which can serve as friction modifiers can be incorporated. A variety of compounds which can serve as defoaming agents or pour point depressants can be incorporated. These auxiliary additives are preferably incorporated into the lubricating oil composition in an amount of not more than 3 wt.%, preferably in an amount of 0.001 to 3 wt.%.
- The present invention is further described by the following illustrative non-limiting working examples.
- The lubricating oil compositions for evaluating their performances were prepared from the below-mentioned base oil and additives, to give lubricating oil composition having a sulfated ash content of 1.0 wt.%, a phosphorus content of 0.09 wt.%, a sulfur content of 0.2 wt.% and a chlorine content of less than 5 ppm. To the lubricating oil composition was added a viscosity index improver to have a viscosity grade (SAE viscosity grade) of 5W30.
-
- 1) Base oil (a mixture of the following Base oil A and Base oil B in a volume ratio of 35:65)
- Base oil A: Super-hydrogenated base oil (kinematic viscosity at 100°C: 4.0 mm2/s, viscosity index: 123, sulfur content: less than 0.001 wt.%)
- Base oil B: Super-hydrogenated base oil (kinematic viscosity at 100°C: 6.5 mm2/s, viscosity index: 132, sulfur content: less than 0.001 wt.%)
- Dispersant A: Ethylene carbonate post-treated succinimide dispersant (nitrogen content: 0.85 wt.%, chlorine content: 30 wt.ppm) prepared according to the procedure described in Example 17 of
JP 7-150166 A - Dispersant B: Boron-containing succinimide dispersant (nitrogen content: 1.5 wt.%, boron content: 0.5 wt.%, chlorine content: less than 5 wt.ppm) prepared according to the procedure described in Example 8 of
JP 7-150166 A - Calcium alkylsalicylate detergent (described hereinafter in Examples 1 to 4 and Comparison Example 1): 0.82 wt.% (amount in terms of sulfated ash content)
- ZnDTP: Zinc dialkyldithiophosphate (P: 7.2 wt.%, Zn: 7.85 wt.%, S: 14.4 wt.%, derived from secondary alcohol having 3 to 8 carbon atoms): 0.09 wt.% (amount in terms of P content)
- Oxidation inhibitor A: Amine compound (dialkyldiphenylamine (alkyl: mixture of C4 alkyl and C8 alkyl), N: 4.6 wt.%, TBN: 180 mg KOH/g): 0.7 wt.%
- Oxidation inhibitor B: Phenolic compound (octyl 3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate): 0.7 wt.%
- Mo-containing compound: Sulfurized oxymolybdenumsuccinimide complex compound (Mo: 5.4 wt.%, S: 3.7 wt.%, TBN: 45 mg KOH/g): 0.85 wt.%
- Viscosity index improver: Non-dispersant type ethylene-propylene copolymer, Paratone 8057)
- A lubricating oil composition (TBN: 9.6 mg KOH/g, organic acid calcium salt content: 1.5 wt.%) was prepared using the following calcium alkylsalicylate detergent:
- Unsulfurized calcium alkylsalicylate detergent having an alkyl group having 14 to 18 carbon atoms (TEN 220 mg KOH/g, petroleum medium content: approx. 30 wt.%, organic acid calcium salt content: 49 wt.%)
- A lubricating oil composition (TBN: 9.6 mg KOH/g, organic acid calcium salt content: 1.5 wt.%) was prepared using the following calcium alkylsalicylate detergent:
- Unsulfurized calcium alkylsalicylate detergent having an alkyl group having 14 to 18 carbon atoms (TBN 225 mg KOH/g, petroleum medium content: at most approx. 30 wt.%, organic acid calcium salt content: 51 wt.%)
- A lubricating oil composition (TBN: 9.6 mg KOH/g, organic acid calcium salt content: 1.2 wt.%) was prepared using the following calcium alkylsalicylate detergent:
- Unsulfurized calcium alkylsalicylate detergent having an alkyl group having 20 to 28 carbon atoms (TBN 230 mg KOH/g, petroleum medium content: approx. 32 wt.%, organic acid calcium salt content: 42.5 wt.%)
- The determination of the organic acid calcium salt content (soap content) and evaluation of high temperature detergency was made by the following methods.
- The detergent was subjected to the conventional dialysis using rubber membrane to separate mineral oil and low molecular weight components out. The remaining residue (A) was an effective detergent component. Separately, the carbon dioxide content of the detergent was determined. Based on the carbon dioxide content and a separately determined calcium content, the content of calcium carbonate (overbasing component content (B)) was determined. The organic acid calcium salt (soap component) was calculated by subtracting (B) from (A).
- The lubricating oil composition was subjected to the below-mentioned hot tube test (KES-07-803) at 300°C and 305°C.
- A glass tube (inner diameter: 2 mm) was placed in a heater block vertically. In the glass tube, the lubricating oil composition and air were supplied from the bottom of the tube at rates of 0.31 cc/hr. and 10 cc/min., respectively. The supply was continued for 16 hours maintaining the heater block at the predetermined temperature. After the supply was terminated, the glass tube was taken out and examined for deposition produced on the inner surface of the tube. The evaluation was performed on the basis of 10 points (maximum). The 10 point means that no deposition was observed.
- The low temperature viscosity (cP) was determined by means of the MRV viscometer (described in ASTM D4684) at -35°C.
-
Oil High temp. detergency Low temp. 300°C 305°C viscosity Example 1 6.0 6.0 25,200 Example 2 6.5 6.0 25,100 Comparative Example 1 5.0 4.5 Unmeasurable - As is seen from the above-mentioned results, the lubricating oil compositions according to the invention (Examples 1 and 2) containing the calcium alkylsalicylate having an alkyl group having 14 to 18 carbon atoms gave improved high temperature detergency under very severe temperature conditions such as 300°C and 305°C, and further showed a low viscosity at the low temperature.
- In contrast, the lubricating oil composition of Comparative Example 1 containing only one calcium alkylsalicylate having an alkyl group having 20 to 28 carbon atoms gave inferior high temperature detergency and could not show a satisfactorily low viscosity (that is, too viscous to measure) at the low temperature.
- A lubricating oil composition (TBN: 9.6 mg KOH/g, organic acid calcium salt content: 1.1 wt.%) was prepared using a 1:1 mixture (in terms of calcium content ratio) of the following two calcium alkylsalicylate detergents:
- Unsulfurized calcium alkylsalicylate detergent having an alkyl group having 14 to 18 carbon atoms (TBN 220 mg KOH/g, petroleum medium content: approx. 30 wt.%, organic acid calcium salt content: 49 wt.%)
- Unsulfurized calcium alkylsalicylate detergent having an alkyl group having 20 to 28 carbon atoms (TBN 320 mg KOH/g, petroleum medium content: approx. 35 wt.%, organic acid calcium salt content: 32.5 wt.%)
- A lubricating oil composition (TBN: 9.6 mg KOH/g, organic acid calcium salt content: 1.1 wt.%) was prepared using a 1:1 mixture (in terms of calcium content ratio) of the following two calcium alkylsalicylate detergents:
- Unsulfurized calcium alkylsalicylate detergent having an alkyl group having 14 to 18 carbon atoms (TBN 225 mg KOH/g, petroleum medium content: at most approx. 30 wt.%, organic acid calcium salt content: 51 wt.%)
- Unsulfurized calcium alkylsalicylate detergent having an alkyl group having 20 to 28 carbon atoms (TBN 320 mg KOH/g, petroleum medium content: approx. 35 wt.%, organic acid calcium salt content: 32.5 wt.%)
- The determination of the organic acid calcium salt content (soap content) and evaluation of high temperature detergency was made by the aforementioned methods.
-
Oil High temp. detergency Low temp. 300°C 305°C viscosity Example 3 6.0 5.0 25,200 Example 4 6.0 5.0 25,100 - As is seen from the above-mentioned results, the lubricating oil compositions according to the invention (Examples 3 and 4) containing the two calcium alkylsalicylates having alkyl groups having different carbon atom numbers gave improved high temperature detergency under very severe temperature conditions such as 300°C and 305°C, and further showed a low viscosity at the low temperature.
Claims (9)
- A lubricating oil composition for lubricating an internal combustion engine which is operated by the use of a fuel oil having a sulfur content of not more than 0.005 wt.%, which comprises the following components a) to d) dissolved or dispersed in a base oil having a sulfur content of not more than 0.1 wt.% and has a sulfated ash content in a range of 0.1 to 1.1 wt.%, a phosphorus content in a range of 0.01 to 0.12 wt.%, a sulfur content in a range of 0.01 to 0.5 wt.% and a chlorine content of not more than 150 ppm:a) an ashless dispersant in an amount of 0.01 to 0.3 wt.% in terms of a nitrogen content, the ashless dispersant being selected from the group consisting of an alkenyl succinimide, an alkyl succinimide, or derivatives thereof;b) a calcium alkylsalicylate detergent in an amount of 0.1 to 1 wt.% in terms of a sulfated ash content, the calcium alkylsalicylate detergent having a sulfur content of not more than 3 wt.% and a total base number in the range of 10 to 350 mg KOH/g, containing an organic acid calcium salt under the condition that the lubricating oil composition contains the organic acid calcium salt in an amount of 0.2 to 7 wt.% based on the amount of the oil composition, and comprising an unsulfurized calcium alkylsalicylate detergent having an alkyl group having 14 to 18 carbon atoms;c) a zinc phosphate anti-wear agent in an amount of 0.01 to 0.12 wt.% in terms of a phosphorus content, the zinc phosphate being selected from the group consisting of a zinc dialkyldithiophosphate and a zinc dihydrocarbylphosphate, andd) an oxidation inhibitor in an amount of 0.01 to 5 wt.%, the oxidation inhibitor being selected from the group consisting of an oxidation inhibiting phenol compound and an oxidation inhibiting amine compound,wherein the sulfated ash content, phosphorus content, sulfur content, and the wt.% given in a) to d) above are values based on the amount of the lubricating oil composition.
- The lubricating oil composition of claim 1, wherein the calcium alkylsalicylate detergent of the component b) has a total base number in the range of 30 to 300 mg KOH/g.
- The lubricating oil composition of claim 1, wherein the unsulfurized calcium alkylsalicylate detergent having an alkyl group having a carbon atom number of 14 to 18 has a total base number in the range of 100 to 250 mg KOH/g.
- The lubricating oil composition of claim 1, wherein the ashless dispersant of the component a) comprises succinimide or a derivative thereof which is obtained by a reaction of a polybutenylsuccinic anhydride with a polyamine, the polybutenylsuccinic anhydride being obtained by a thermal reaction of polybutene and maleic anhydride in the absence of chlorine or a chlorinecontaining compound.
- The lubricating oil composition of claim 1, which contains a molybdenum-containing compound in an amount of 0.01 to 5 wt.%.
- The lubricating oil composition of claim 1, wherein the lubricating oil composition has a total base number in the range of 1 to 17 mg KOH/g.
- The lubricating oil composition of claim 1, which is a multi-grade engine oil contains a viscosity index improver and is an oil of 0W5, 0W10, 0W15, 0W20, 0W30, 5W20, 5W30, 10W20, or 10W30.
- The lubricating oil composition of claim 1, which is employed for lubricating a diesel engine operated using a fuel oil having a sulfur content of not more than 0.005 wt.%, the diesel engine being mounted on an overland-running vehicle.
- A method for operating a diesel engine by the use of a fuel oil having a sulfur content of not more than 0.005 wt.% and a lubricating oil composition of claim 1, the diesel engine being mounted on an overland-running vehicle.
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EP (1) | EP2428550B1 (en) |
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EP2824165A1 (en) * | 2013-07-09 | 2015-01-14 | Infineum International Limited | Marine engine lubrication |
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JP6027170B1 (en) * | 2015-03-31 | 2016-11-16 | 出光興産株式会社 | Lubricating oil composition for internal combustion engines |
US9701921B1 (en) * | 2016-04-08 | 2017-07-11 | Afton Chemical Corporation | Lubricant additives and lubricant compositions having improved frictional characteristics |
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JP4768965B2 (en) * | 2004-03-16 | 2011-09-07 | Jx日鉱日石エネルギー株式会社 | Lubricating oil composition |
JP4883255B2 (en) * | 2004-03-16 | 2012-02-22 | Jx日鉱日石エネルギー株式会社 | Lubricating oil composition |
JP5101915B2 (en) * | 2007-03-27 | 2012-12-19 | Jx日鉱日石エネルギー株式会社 | Lubricating oil composition for diesel engines |
-
2010
- 2010-09-08 JP JP2010201230A patent/JP4949510B2/en active Active
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2011
- 2011-09-06 SG SG2011064011A patent/SG179357A1/en unknown
- 2011-09-07 KR KR1020110090702A patent/KR20120026007A/en not_active Application Discontinuation
- 2011-09-07 CA CA2751841A patent/CA2751841A1/en not_active Abandoned
- 2011-09-07 EP EP11180359.9A patent/EP2428550B1/en active Active
- 2011-09-07 US US13/227,090 patent/US20120118258A1/en not_active Abandoned
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US3929650A (en) | 1974-03-22 | 1975-12-30 | Chevron Res | Extreme pressure agent and its preparation |
US4089790A (en) | 1975-11-28 | 1978-05-16 | Chevron Research Company | Synergistic combinations of hydrated potassium borate, antiwear agents, and organic sulfide antioxidants |
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EP2824165A1 (en) * | 2013-07-09 | 2015-01-14 | Infineum International Limited | Marine engine lubrication |
AU2014203733B2 (en) * | 2013-07-09 | 2016-02-25 | Infineum International Limited | Marine engine lubrication |
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KR20120026007A (en) | 2012-03-16 |
JP4949510B2 (en) | 2012-06-13 |
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CA2751841A1 (en) | 2012-03-08 |
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US20120118258A1 (en) | 2012-05-17 |
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