JP2014025041A - 内燃機関用潤滑油組成物 - Google Patents
内燃機関用潤滑油組成物 Download PDFInfo
- Publication number
- JP2014025041A JP2014025041A JP2012168935A JP2012168935A JP2014025041A JP 2014025041 A JP2014025041 A JP 2014025041A JP 2012168935 A JP2012168935 A JP 2012168935A JP 2012168935 A JP2012168935 A JP 2012168935A JP 2014025041 A JP2014025041 A JP 2014025041A
- Authority
- JP
- Japan
- Prior art keywords
- internal combustion
- combustion engine
- lubricating oil
- base oil
- mass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 239000000203 mixture Substances 0.000 title claims abstract description 87
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 70
- 239000010687 lubricating oil Substances 0.000 title claims abstract description 63
- 239000002199 base oil Substances 0.000 claims abstract description 88
- 239000000446 fuel Substances 0.000 claims abstract description 45
- 239000003921 oil Substances 0.000 claims abstract description 27
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000011593 sulfur Substances 0.000 claims abstract description 26
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 26
- LDVVTQMJQSCDMK-UHFFFAOYSA-N 1,3-dihydroxypropan-2-yl formate Chemical compound OCC(CO)OC=O LDVVTQMJQSCDMK-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000003208 petroleum Substances 0.000 claims abstract description 17
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerol Natural products OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 12
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 12
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 10
- 239000013256 coordination polymer Substances 0.000 claims abstract description 10
- 235000011187 glycerol Nutrition 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 6
- RZRNAYUHWVFMIP-KTKRTIGZSA-N 1-oleoylglycerol Chemical group CCCCCCCC\C=C/CCCCCCCC(=O)OCC(O)CO RZRNAYUHWVFMIP-KTKRTIGZSA-N 0.000 claims description 10
- 239000002551 biofuel Substances 0.000 claims description 9
- 239000003225 biodiesel Substances 0.000 claims description 6
- 125000001183 hydrocarbyl group Chemical group 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 43
- -1 glycerin fatty acid ester Chemical class 0.000 abstract description 29
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 11
- 150000002430 hydrocarbons Chemical group 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 7
- 235000014113 dietary fatty acids Nutrition 0.000 abstract description 6
- 229930195729 fatty acid Natural products 0.000 abstract description 6
- 239000000194 fatty acid Substances 0.000 abstract description 6
- 150000004665 fatty acids Chemical class 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 21
- 229910052757 nitrogen Inorganic materials 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 16
- 239000000654 additive Substances 0.000 description 15
- 230000000996 additive effect Effects 0.000 description 13
- 239000000839 emulsion Substances 0.000 description 13
- 239000010705 motor oil Substances 0.000 description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 229910052698 phosphorus Inorganic materials 0.000 description 12
- 239000011574 phosphorus Substances 0.000 description 12
- 239000003963 antioxidant agent Substances 0.000 description 11
- 239000007789 gas Substances 0.000 description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 10
- 239000003502 gasoline Substances 0.000 description 10
- 239000003607 modifier Substances 0.000 description 10
- IOJUPLGTWVMSFF-UHFFFAOYSA-N benzothiazole Chemical compound C1=CC=C2SC=NC2=C1 IOJUPLGTWVMSFF-UHFFFAOYSA-N 0.000 description 9
- 239000010779 crude oil Substances 0.000 description 9
- 238000000926 separation method Methods 0.000 description 9
- 239000000126 substance Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 6
- 239000002518 antifoaming agent Substances 0.000 description 6
- NUMQCACRALPSHD-UHFFFAOYSA-N tert-butyl ethyl ether Chemical compound CCOC(C)(C)C NUMQCACRALPSHD-UHFFFAOYSA-N 0.000 description 6
- 150000001412 amines Chemical class 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000002480 mineral oil Substances 0.000 description 5
- 229920000098 polyolefin Polymers 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- HPEUJPJOZXNMSJ-UHFFFAOYSA-N Methyl stearate Chemical group CCCCCCCCCCCCCCCCCC(=O)OC HPEUJPJOZXNMSJ-UHFFFAOYSA-N 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 125000000217 alkyl group Chemical group 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 229920000193 polymethacrylate Polymers 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- DKCPKDPYUFEZCP-UHFFFAOYSA-N 2,6-di-tert-butylphenol Chemical compound CC(C)(C)C1=CC=CC(C(C)(C)C)=C1O DKCPKDPYUFEZCP-UHFFFAOYSA-N 0.000 description 3
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 3
- 150000001336 alkenes Chemical class 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000004821 distillation Methods 0.000 description 3
- 238000004945 emulsification Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 239000006078 metal deactivator Substances 0.000 description 3
- 235000010446 mineral oil Nutrition 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 3
- 229920013639 polyalphaolefin Polymers 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000001294 propane Substances 0.000 description 3
- 230000001603 reducing effect Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- WMYJOZQKDZZHAC-UHFFFAOYSA-H trizinc;dioxido-sulfanylidene-sulfido-$l^{5}-phosphane Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([S-])=S.[O-]P([O-])([S-])=S WMYJOZQKDZZHAC-UHFFFAOYSA-H 0.000 description 3
- RUFPHBVGCFYCNW-UHFFFAOYSA-N 1-naphthylamine Chemical compound C1=CC=C2C(N)=CC=CC2=C1 RUFPHBVGCFYCNW-UHFFFAOYSA-N 0.000 description 2
- ICKWICRCANNIBI-UHFFFAOYSA-N 2,4-di-tert-butylphenol Chemical compound CC(C)(C)C1=CC=C(O)C(C(C)(C)C)=C1 ICKWICRCANNIBI-UHFFFAOYSA-N 0.000 description 2
- JZODKRWQWUWGCD-UHFFFAOYSA-N 2,5-di-tert-butylbenzene-1,4-diol Chemical compound CC(C)(C)C1=CC(O)=C(C(C)(C)C)C=C1O JZODKRWQWUWGCD-UHFFFAOYSA-N 0.000 description 2
- GJYCVCVHRSWLNY-UHFFFAOYSA-N 2-butylphenol Chemical compound CCCCC1=CC=CC=C1O GJYCVCVHRSWLNY-UHFFFAOYSA-N 0.000 description 2
- VSAWBBYYMBQKIK-UHFFFAOYSA-N 4-[[3,5-bis[(3,5-ditert-butyl-4-hydroxyphenyl)methyl]-2,4,6-trimethylphenyl]methyl]-2,6-ditert-butylphenol Chemical compound CC1=C(CC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)C(C)=C(CC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)C(C)=C1CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 VSAWBBYYMBQKIK-UHFFFAOYSA-N 0.000 description 2
- QRHDSDJIMDCCKE-UHFFFAOYSA-N 4-ethyl-2h-benzotriazole Chemical compound CCC1=CC=CC2=C1N=NN2 QRHDSDJIMDCCKE-UHFFFAOYSA-N 0.000 description 2
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 2
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 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
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 2
- CGRTZESQZZGAAU-UHFFFAOYSA-N [2-[3-[1-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propanoyloxy]-2-methylpropan-2-yl]-2,4,8,10-tetraoxaspiro[5.5]undecan-9-yl]-2-methylpropyl] 3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C)=CC(CCC(=O)OCC(C)(C)C2OCC3(CO2)COC(OC3)C(C)(C)COC(=O)CCC=2C=C(C(O)=C(C)C=2)C(C)(C)C)=C1 CGRTZESQZZGAAU-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 239000012964 benzotriazole Substances 0.000 description 2
- FQUNFJULCYSSOP-UHFFFAOYSA-N bisoctrizole Chemical compound N1=C2C=CC=CC2=NN1C1=CC(C(C)(C)CC(C)(C)C)=CC(CC=2C(=C(C=C(C=2)C(C)(C)CC(C)(C)C)N2N=C3C=CC=CC3=N2)O)=C1O FQUNFJULCYSSOP-UHFFFAOYSA-N 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- 239000004205 dimethyl polysiloxane Substances 0.000 description 2
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- CAMHHLOGFDZBBG-UHFFFAOYSA-N epoxidized methyl oleate Natural products CCCCCCCCC1OC1CCCCCCCC(=O)OC CAMHHLOGFDZBBG-UHFFFAOYSA-N 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 150000002990 phenothiazines Chemical class 0.000 description 2
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical class [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- HVLLSGMXQDNUAL-UHFFFAOYSA-N triphenyl phosphite Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)OC1=CC=CC=C1 HVLLSGMXQDNUAL-UHFFFAOYSA-N 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical class C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 description 1
- BCMCBBGGLRIHSE-UHFFFAOYSA-N 1,3-benzoxazole Chemical class C1=CC=C2OC=NC2=C1 BCMCBBGGLRIHSE-UHFFFAOYSA-N 0.000 description 1
- YHMYGUUIMTVXNW-UHFFFAOYSA-N 1,3-dihydrobenzimidazole-2-thione Chemical compound C1=CC=C2NC(S)=NC2=C1 YHMYGUUIMTVXNW-UHFFFAOYSA-N 0.000 description 1
- PWNBRRGFUVBTQG-UHFFFAOYSA-N 1-n,4-n-di(propan-2-yl)benzene-1,4-diamine Chemical compound CC(C)NC1=CC=C(NC(C)C)C=C1 PWNBRRGFUVBTQG-UHFFFAOYSA-N 0.000 description 1
- IHWDIGHWDQPQMQ-UHFFFAOYSA-N 1-octadecylsulfanyloctadecane Chemical compound CCCCCCCCCCCCCCCCCCSCCCCCCCCCCCCCCCCCC IHWDIGHWDQPQMQ-UHFFFAOYSA-N 0.000 description 1
- WJFKNYWRSNBZNX-UHFFFAOYSA-N 10H-phenothiazine Chemical compound C1=CC=C2NC3=CC=CC=C3SC2=C1 WJFKNYWRSNBZNX-UHFFFAOYSA-N 0.000 description 1
- HYZJCKYKOHLVJF-UHFFFAOYSA-N 1H-benzimidazole Chemical compound C1=CC=C2NC=NC2=C1 HYZJCKYKOHLVJF-UHFFFAOYSA-N 0.000 description 1
- BAXOFTOLAUCFNW-UHFFFAOYSA-N 1H-indazole Chemical compound C1=CC=C2C=NNC2=C1 BAXOFTOLAUCFNW-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
- SNTWKPAKVQFCCF-UHFFFAOYSA-N 2,3-dihydro-1h-triazole Chemical class N1NC=CN1 SNTWKPAKVQFCCF-UHFFFAOYSA-N 0.000 description 1
- OPLCSTZDXXUYDU-UHFFFAOYSA-N 2,4-dimethyl-6-tert-butylphenol Chemical compound CC1=CC(C)=C(O)C(C(C)(C)C)=C1 OPLCSTZDXXUYDU-UHFFFAOYSA-N 0.000 description 1
- ZBADMMCYTSORHN-UHFFFAOYSA-N 2,5-bis(dodecyldisulfanyl)-1,3,4-thiadiazole Chemical compound CCCCCCCCCCCCSSC1=NN=C(SSCCCCCCCCCCCC)S1 ZBADMMCYTSORHN-UHFFFAOYSA-N 0.000 description 1
- ZGWOXISFZXPTGJ-UHFFFAOYSA-N 2,5-bis(heptyldisulfanyl)-1,3,4-thiadiazole Chemical compound CCCCCCCSSC1=NN=C(SSCCCCCCC)S1 ZGWOXISFZXPTGJ-UHFFFAOYSA-N 0.000 description 1
- MGEQSWVPSCZGEK-UHFFFAOYSA-N 2,5-bis(nonyldisulfanyl)-1,3,4-thiadiazole Chemical compound CCCCCCCCCSSC1=NN=C(SSCCCCCCCCC)S1 MGEQSWVPSCZGEK-UHFFFAOYSA-N 0.000 description 1
- LKALLEFLBKHPTQ-UHFFFAOYSA-N 2,6-bis[(3-tert-butyl-2-hydroxy-5-methylphenyl)methyl]-4-methylphenol Chemical compound OC=1C(CC=2C(=C(C=C(C)C=2)C(C)(C)C)O)=CC(C)=CC=1CC1=CC(C)=CC(C(C)(C)C)=C1O LKALLEFLBKHPTQ-UHFFFAOYSA-N 0.000 description 1
- BVUXDWXKPROUDO-UHFFFAOYSA-N 2,6-di-tert-butyl-4-ethylphenol Chemical compound CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 BVUXDWXKPROUDO-UHFFFAOYSA-N 0.000 description 1
- SLUKQUGVTITNSY-UHFFFAOYSA-N 2,6-di-tert-butyl-4-methoxyphenol Chemical compound COC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SLUKQUGVTITNSY-UHFFFAOYSA-N 0.000 description 1
- FIFXMZHMRFLFLK-UHFFFAOYSA-N 2,6-ditert-butyl-4-(methylaminomethyl)phenol Chemical compound CNCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 FIFXMZHMRFLFLK-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
- YQQQXXUABFURLN-UHFFFAOYSA-N 2,6-ditert-butyl-4-ethoxyphenol Chemical compound CCOC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 YQQQXXUABFURLN-UHFFFAOYSA-N 0.000 description 1
- GEHIXSKXGCIKJJ-UHFFFAOYSA-N 2-(chloromethyl)-5-(4-methoxyphenyl)-1,3,4-oxadiazole Chemical compound C1=CC(OC)=CC=C1C1=NN=C(CCl)O1 GEHIXSKXGCIKJJ-UHFFFAOYSA-N 0.000 description 1
- HYXVEQIONZKDIA-UHFFFAOYSA-N 2-(decyldisulfanyl)-1,3-benzoxazole Chemical compound C1=CC=C2OC(SSCCCCCCCCCC)=NC2=C1 HYXVEQIONZKDIA-UHFFFAOYSA-N 0.000 description 1
- XTYDQWTYBIZARF-UHFFFAOYSA-N 2-(decyldisulfanyl)-1h-benzimidazole Chemical compound C1=CC=C2NC(SSCCCCCCCCCC)=NC2=C1 XTYDQWTYBIZARF-UHFFFAOYSA-N 0.000 description 1
- YRQOYOWFUDLPGC-UHFFFAOYSA-N 2-(dodecyldisulfanyl)-1,3-benzoxazole Chemical compound C1=CC=C2OC(SSCCCCCCCCCCCC)=NC2=C1 YRQOYOWFUDLPGC-UHFFFAOYSA-N 0.000 description 1
- ITJODUNSZXNTOI-UHFFFAOYSA-N 2-(dodecyldisulfanyl)-1h-benzimidazole Chemical compound C1=CC=C2NC(SSCCCCCCCCCCCC)=NC2=C1 ITJODUNSZXNTOI-UHFFFAOYSA-N 0.000 description 1
- CYXWNSBYVBWROX-UHFFFAOYSA-N 2-(octyldisulfanyl)-1,3-benzothiazole Chemical compound C1=CC=C2SC(SSCCCCCCCC)=NC2=C1 CYXWNSBYVBWROX-UHFFFAOYSA-N 0.000 description 1
- LFAMMXHEBNTRPL-UHFFFAOYSA-N 2-(octyldisulfanyl)-1,3-benzoxazole Chemical compound C1=CC=C2OC(SSCCCCCCCC)=NC2=C1 LFAMMXHEBNTRPL-UHFFFAOYSA-N 0.000 description 1
- ZYLBDGBVCLZOII-UHFFFAOYSA-N 2-(octyldisulfanyl)-1h-benzimidazole Chemical compound C1=CC=C2NC(SSCCCCCCCC)=NC2=C1 ZYLBDGBVCLZOII-UHFFFAOYSA-N 0.000 description 1
- ROHFBIREHKPELA-UHFFFAOYSA-N 2-[(3,5-ditert-butyl-4-hydroxyphenyl)methyl]prop-2-enoic acid;methane Chemical compound C.CC(C)(C)C1=CC(CC(=C)C(O)=O)=CC(C(C)(C)C)=C1O.CC(C)(C)C1=CC(CC(=C)C(O)=O)=CC(C(C)(C)C)=C1O.CC(C)(C)C1=CC(CC(=C)C(O)=O)=CC(C(C)(C)C)=C1O.CC(C)(C)C1=CC(CC(=C)C(O)=O)=CC(C(C)(C)C)=C1O ROHFBIREHKPELA-UHFFFAOYSA-N 0.000 description 1
- CXCIRGCZPUJGMH-UHFFFAOYSA-N 2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propanoyloxy]ethyl 3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C)=CC(CCC(=O)OCCOC(=O)CCC=2C=C(C(O)=C(C)C=2)C(C)(C)C)=C1 CXCIRGCZPUJGMH-UHFFFAOYSA-N 0.000 description 1
- JBIJLHTVPXGSAM-UHFFFAOYSA-N 2-naphthylamine Chemical compound C1=CC=CC2=CC(N)=CC=C21 JBIJLHTVPXGSAM-UHFFFAOYSA-N 0.000 description 1
- WJQOZHYUIDYNHM-UHFFFAOYSA-N 2-tert-Butylphenol Chemical compound CC(C)(C)C1=CC=CC=C1O WJQOZHYUIDYNHM-UHFFFAOYSA-N 0.000 description 1
- HXIQYSLFEXIOAV-UHFFFAOYSA-N 2-tert-butyl-4-(5-tert-butyl-4-hydroxy-2-methylphenyl)sulfanyl-5-methylphenol Chemical compound CC1=CC(O)=C(C(C)(C)C)C=C1SC1=CC(C(C)(C)C)=C(O)C=C1C HXIQYSLFEXIOAV-UHFFFAOYSA-N 0.000 description 1
- PFANXOISJYKQRP-UHFFFAOYSA-N 2-tert-butyl-4-[1-(5-tert-butyl-4-hydroxy-2-methylphenyl)butyl]-5-methylphenol Chemical compound C=1C(C(C)(C)C)=C(O)C=C(C)C=1C(CCC)C1=CC(C(C)(C)C)=C(O)C=C1C PFANXOISJYKQRP-UHFFFAOYSA-N 0.000 description 1
- IMOYOUMVYICGCA-UHFFFAOYSA-N 2-tert-butyl-4-hydroxyanisole Chemical compound COC1=CC=C(O)C=C1C(C)(C)C IMOYOUMVYICGCA-UHFFFAOYSA-N 0.000 description 1
- IKEHOXWJQXIQAG-UHFFFAOYSA-N 2-tert-butyl-4-methylphenol Chemical compound CC1=CC=C(O)C(C(C)(C)C)=C1 IKEHOXWJQXIQAG-UHFFFAOYSA-N 0.000 description 1
- XOUQAVYLRNOXDO-UHFFFAOYSA-N 2-tert-butyl-5-methylphenol Chemical compound CC1=CC=C(C(C)(C)C)C(O)=C1 XOUQAVYLRNOXDO-UHFFFAOYSA-N 0.000 description 1
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- ODJQKYXPKWQWNK-UHFFFAOYSA-N 3,3'-Thiobispropanoic acid Chemical class OC(=O)CCSCCC(O)=O ODJQKYXPKWQWNK-UHFFFAOYSA-N 0.000 description 1
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- 125000001196 nonadecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- JKBYAWVSVVSRIX-UHFFFAOYSA-N octadecyl 2-(1-octadecoxy-1-oxopropan-2-yl)sulfanylpropanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C(C)SC(C)C(=O)OCCCCCCCCCCCCCCCCCC JKBYAWVSVVSRIX-UHFFFAOYSA-N 0.000 description 1
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- DOIRQSBPFJWKBE-UHFFFAOYSA-N phthalic acid di-n-butyl ester Natural products CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 1
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- 239000010935 stainless steel Substances 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
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- CNUJLMSKURPSHE-UHFFFAOYSA-N trioctadecyl phosphite Chemical compound CCCCCCCCCCCCCCCCCCOP(OCCCCCCCCCCCCCCCCCC)OCCCCCCCCCCCCCCCCCC CNUJLMSKURPSHE-UHFFFAOYSA-N 0.000 description 1
- JZNDMMGBXUYFNQ-UHFFFAOYSA-N tris(dodecylsulfanyl)phosphane Chemical compound CCCCCCCCCCCCSP(SCCCCCCCCCCCC)SCCCCCCCCCCCC JZNDMMGBXUYFNQ-UHFFFAOYSA-N 0.000 description 1
- QQBLOZGVRHAYGT-UHFFFAOYSA-N tris-decyl phosphite Chemical compound CCCCCCCCCCOP(OCCCCCCCCCC)OCCCCCCCCCC QQBLOZGVRHAYGT-UHFFFAOYSA-N 0.000 description 1
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- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
- C10M129/68—Esters
- C10M129/76—Esters containing free hydroxy or carboxyl groups
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
- F02B43/02—Engines characterised by means for increasing operating efficiency
-
- 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
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M2203/102—Aliphatic fractions
- C10M2203/1025—Aliphatic fractions used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
- C10M2205/022—Ethene
-
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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Abstract
【解決手段】(A)少なくとも2種以上のAPI(米国石油協会)の基油カテゴリーが異なる基油を混合した基油混合物であって、硫黄分が0.14〜0.7質量%、ASTM D3238による%CAが0.9〜5.0、ASTM D3238による%CPが60以上である基油混合物、及び(B)炭素数8〜22の炭化水素基を有するモノグリセリド(グリセリンの3つのヒドロキシル基のうち1つに脂肪酸がエステル結合したグリセリン脂肪酸エステル)であり、水酸基価150〜300mgKOH/gであることを特徴とするモノグリセリドを、組成物全量基準で0.3〜2.0質量%、を含有する内燃機関用潤滑油組成物。
【選択図】なし
Description
本発明は、より具体的には、下記〔1〕〜〔5〕を提供するものである。
(B)炭素数8〜22の炭化水素基を有するモノグリセリド(グリセリンの3つのヒドロキシル基のうち1つに脂肪酸がエステル結合したグリセリン脂肪酸エステル)であり、水酸基価150〜300mgKOH/gであることを特徴とするモノグリセリドを、組成物全量基準で0.3〜2.0質量%、
を含有することを特徴とする内燃機関用潤滑油組成物である。
(A)少なくとも2種以上のAPI(米国石油協会)の基油カテゴリーが異なる基油を混合した基油混合物であって、硫黄分が0.14〜0.7質量%、ASTM D3238による%CAが0.9〜5.0、ASTM D3238による%CPが60以上である基油混合物、及び
(B)炭素数8〜22の炭化水素基を有するモノグリセリド(グリセリンの3つのヒドロキシル基のうち1つに脂肪酸がエステル結合したグリセリン脂肪酸エステル)であり、水酸基価150〜300mgKOH/gであることを特徴とするモノグリセリドを、組成物全量基準で0.3〜2.0質量%、
を含有することを特徴とする内燃機関用潤滑油組成物に関する。
本潤滑油組成物の基油混合物としては、高度精製基油と呼ばれる鉱油、炭化水素系合成油を使用することができ、特に、API(American Petroleum Institute,米国石油協会)基油カテゴリーでグループ1、グループ2、グループ3、及びグループ4などに属する基油を、少なくとも2種以上混合させた基油混合物として使用することができる。ここで使用する基油混合物は、100℃動粘度が3〜12mm2/s、好ましくは3〜10mm2/s、より好ましくは3〜8mm2/sであってもよい。粘度指数が100〜180、好ましくは100〜160、より好ましくは100〜150であってもよい。硫黄分が0.14〜0.7質量%、好ましくは0.15〜0.5質量%、より好ましくは0.16〜0.3質量%、最も好ましくは0.16〜0.23質量%であってもよい。また、ASTM D3238による%CAが0.9〜5.0、好ましくは0.9〜3.5、より好ましくは1.0〜1.6であってもよい。また、ASTM D3238による%CPが60以上、好ましくは65以上、より好ましくは72以上であってもよい。また15℃密度は0.8〜0.9g/cm3、好ましくは0.8〜0.865g/cm3、より好ましくは0.81〜0.83g/cm3であってもよい。
無配系摩擦調整剤として使用されるモノグリセリドは、脂肪酸の炭化水素基の部分は炭素数8〜22であり、この炭素数8〜22の炭化水素基としては、具体的には例えばオクチル基、ノニル基、デシル基、ウンデシル基、ドデシル基、トリデシル基、テトラデシル基、ペンタデシル基、ヘキサデシル基、ヘプタデシル基、オクタデシル基、ノナデシル基、イコシル基、ヘンイコシル基、ドコシル基等のアルキル基(これらアルキル基は直鎖状でも分枝状でもよい)やオクテニル基、ノネニル基、デセニル基、ウンデセニル基、ドデセニル基、トリデセニル基、テトラデセニル基、ペンタデセニル基、ヘキサデセニル基、ヘプタデセニル基、オクタデセニル基、ノナデセニル基、イコセニル基、ヘンイコセニル基、ドコセニル基等のアルケニル基(これらのアルケニル基は直鎖状でも分枝状でもよく、また2重結合の位置も任意で、シス型、トランス型でもよい)が挙げられる。
上記した成分のほかに更に性能を向上させるため、必要に応じて種々の添加剤を適宜使用することができる。これらのものとしては、酸化防止剤、金属不活性剤、耐摩耗剤、消泡剤、粘度指数向上剤、流動点降下剤、清浄分散剤、防錆剤、等や、その他の公知の潤滑油添加剤を挙げることができる。
また、3,5−ジ−t−ブチル−4−ヒドロキシベンジルメルカプト−オクチルアセテート、n−オクタデシル−3−(3,5−ジ−t−ブチル−4−ヒドロキシフェニル)プロピオネート(吉富製薬社製:ヨシノックスSS)、n−ドデシル−3−(3,5−ジ−t−ブチル−4−ヒドロキシフェニル)プロピオネート、2’−エチルヘキシル−3−(3,5−ジ−t−ブチル−4−ヒドロキシフェニル)プロピオネート、ベンゼンプロパン酸3,5−ビス(1,1−ジメチル−エチル)−4−ヒドロキシ−C7〜C9側鎖アルキルエステル(チバ・スペシャルティ・ケミカルズ社製:IrganoxL135)などのアルキル−3−(3,5−ジ−t−ブチル−4−ヒドロキシフェニル)プロピオネート類、2,6−ジ−t−ブチル−α−ジメチルアミノ−p−クレゾール、2,2’−メチレンビス(4−メチル−6−t−ブチルフェノール)(川口化学社製:アンテージW−400)、2,2’−メチレンビス(4−エチル−6−t−ブチルフェノール)(川口化学社製:アンテージW−500)などの2,2’−メチレンビス(4−アルキル−6−t−ブチルフェノール)類がある。
1.組成材料
実施例及び比較例の調製にあたり、下記の組成材料を用意した。
(1)基油
実施例及び比較例にて使用した基油1〜7は表1の性状を示すものである。ここで、40℃動粘度、100℃動粘度は、JIS K 2283「原油及び石油製品−動粘度試験方法及び粘度指数算出方法」によって得られる値である。また、粘度指数は、JIS−K−2283「原油及び石油製品-動粘度試験方法及び粘度指数算出方法」に準拠して得られる値である。流動点(P.P)についてはJIS K 2269、引火点についてはJIS K 2265−4(COC:クリーブランド開放法)、硫黄分についてはJIS K 2541(放射線励式起法)を用いた。さらに、%CA、%CN及び%CPについてはASTM D3238を用いた。
(2)添加剤
(2−1)添加剤A1:グリセリンモノオレエート(花王社製、製品名:エキセルO−95R)
・分子蒸留モノグリセライド
・融点 40℃
・水酸基価 220mgKOH/g
(2−2)添加剤B:GF−5パッケージ
内燃機関油用添加剤パッケージで、潤滑油中に本添加剤を8.9−10.55質量%配合すると、API−SN、ILSAC GF−5規格に適した性能が得られることがオロナイト社の商品カタログに記載されている。実施例中では、本添加剤Bの配合量を9.05質量%としてILSAC GF−5規格に適した配合量を使用しているが、添加剤Bの配合量が特に制限されるものではない。
(2−8)添加剤C1:粘度指数向上剤−1
ポリメタアクリレート系粘度指数向上剤。非分散タイプ。
オレフィンコーポリマー系粘度指数向上剤。非分散タイプ。
軽油にジメチルポリシロキサンタイプのシリコーンオイルを3質量%溶解した消泡剤溶液。
2.潤滑油組成物の調製
上記した組成材料を用いて、表2に示す組成により実施例1〜4、比較例1〜6の潤滑油組成物を調製した。
3.試験
実施例1〜4及び比較例1〜6の潤滑油組成物について、その性能を見るために以下に示す各種試験を行った。
(1)100℃動粘度
100℃動粘度は、JIS K 2283「原油及び石油製品−動粘度試験方法及び粘度指数算出方法」に準拠して測定した。
(2)低温粘度
−30℃及び−35℃における低温粘度はASTM D5293に準拠して測定した。
(3)シェル式4球摩耗試験
シェル式4球試験は、ASTM D4172に準拠して、回転数1800rpm、油温50℃、荷重40kgf、及び時間は30分の条件で実施した。試験後、試験片を取り出して、摩耗痕幅を測定し、結果を示した。
(4)摩擦係数測定試験
摩擦特性を見るために、ASTM−G−133(American Society for Testing and Materials)で使用されるCAMERON−PLINT・TE77試験機を用いて摩擦係数を測定、評価した。上部試験片はSK−3製で直径6mm、長さ16mmの円筒形とし、下部試験片はSK−3製の板を用い、試験温度80℃、荷重300N、振幅15mm、往復振動数10Hzで10分間試験を実施し、安定した最後の1分間に測定した摩擦係数の平均値を記した。摩擦係数が小さいほど摩擦低減性が優れていることを示す。
(5)乳化性試験
潤滑油のエマルジョン安定性(水を抱き込む性能)を評価するために、ASTM D7563に準拠した以下の乳油化性試験を実施した。
市販の高速で撹拌が可能なブレンダー、例えば今回の評価では株式会社エム・エフ・アイ社製のステンレス製容器を用いたWARING BLENDER 7011H (現在は7011S)を使用して、試作のE85燃料、蒸留水を使って評価試験を実施した。試験手順は以下の通り。
室温(20℃±5℃)下で、200mlメスシリンダーで評価する試験油を185ml計測し、ブレンダー7011Hへ投入、次に100mlメスシリンダーで試作E85燃料を15ml計測、ブレンダー7011Hへ投入し、最後に100mlメスシリンダーで蒸留水を15ml計測、7011Hへ投入する。その後直ちに容器のふたをして、回転数15000rpmで、60秒間撹拌する。撹拌が終了したら、直ちに蓋ができる摺りガラス栓付の100mlメスシリンダーへ混合溶液を100ml入れて、既定の温度(−5〜0℃もしくは20〜25℃)の恒温槽へ24時間静置する。撹拌してから恒温槽に24時間静置後、油-エマルジョン−水の量をメスシリンダーの目盛で計測し、水の分離が見られたものは水分離、水の分離が見られなかったものは水分離無しで、表2に示した。
試作E85燃料については、市販のJIS1号自動車ガソリン850mlと和光純薬工業の特級エタノール150mlをメスシリンダーで測り、常温で混合したものを使用した。
試験に必要な混合は、規定された時間内に短期間で終了し、使用にあたっては軽質分が揮発しないようにしっかりと密閉できる容器に入れて、室内の冷暗所に保管した。
比較例5及び実施例4については、米国の独立研究開発機関であるSouth West
Research Institute にてASTM D7563を実施し、同じ結果を得た。
4.考察
比較例1は、グリセリンモノオレエートを含まないエンジン油で、乳化性試験では水の分離は見られなかった。しかし、グリセリンモノオレエートを含まないため、摩擦係数測定試験の結果は摩擦係数が0.112と高く、エンジン摩擦低減による省燃費性の効果が得られない。
比較例2及び3は異なる粘度指数向上剤を使用した0W−20グレードのエンジン油で、それぞれにグリセリンモノオレエートを添加し、摩擦係数は0.1以下の結果が得られ、摩擦係数低減による省燃費性の効果が得られた。また、比較例4は、5W−30グレードのエンジン油で、グリセリンモノオレエートを添加したものであるが、本比較例においても摩擦係数は0.1以下の結果が得られ、摩擦係数低減による省燃費性の効果が得られた。しかし一方では、グリセリンモノオレエートを使用したこれらの油種では、その界面化学作用が強いため、水と油類とが比較的早く分離してしまうことがわかった。
比較例2、3及び4の結果より、使用する非分散タイプの粘度指数向上剤のタイプ(ポリ(メタ)アクリレート、オレフィンコーポリマー)、ポリマー濃度、粘度の違いによる乳化性の違いは見られないことが明らかとなった。
比較例5及び6では、グループ1の基油を10質量%及び20質量%配合した潤滑油基油を用いたが、グリセリンモノオレエートによる強い水分離性を解除することができなかった。
実施例1〜3において、グループ1基油を25質量%以上配合した潤滑油基油を用いたところ、グリセリンモノオレエートの強い界面活性効果による水分離性を解除し、Emulsion-Retention(エマルション安定性)を改善することができた。また、耐摩耗性及び、摩擦係数低減効果も維持できることも明らかとなった。
実施例4では、既定の性状を示すAPIのグループ3基油の中でも、フィッシャートロプシュ法によって合成されたGTL(ガストゥリキッド)基油を使用した。
既定のグループ1基油を25質量%以上配合すればフィッシャートロプシュ法によって合成された基油に対しても、良好な耐摩耗性及び摩擦低減効果を維持しながら、水分離性を解除し、Emulsion-Retention(エマルション安定性)を維持することができることが明らかとなった。
以上のことから、特定構造のモノグリセリドの無灰系摩擦調整剤と共に、少なくとも2種以上のAPI(米国石油協会)の基油カテゴリーが異なる基油を混合した基油混合物を用い、且つ、前述した基油混合物の性状(基油混合物中に含まれる硫黄分や基油混合物中の%CA等)を所定範囲に設定することで、優れた耐摩耗性及び省燃費性を示すと共に、エマルション安定性が向上することが明らかとなった。
尚、グループ1基油を配合した実施例1〜4、比較例5及び6において、「潤滑油組成物中のモノグリセリドの質量%/基油混合物中の%CA」の比を計算したところ、実施例1〜4においては0.5625〜0.9の値を示し、比較例5及び6においては1.125〜2.25の値を示した。また、グループ1基油を配合した実施例1〜4、比較例5及び6において、「潤滑油組成物中のモノグリセリドの質量%/基油混合物中の硫黄分の質量%」の比を計算したところ、実施例1〜4においては3.91〜5.625の値を示し、比較例5及び6においては6.923〜12.857の値を示した。
Claims (5)
- (A)少なくとも2種以上のAPI(米国石油協会)の基油カテゴリーが異なる基油を混合した基油混合物であって、硫黄分が0.14〜0.7質量%、ASTM D3238による%CAが0.9〜5.0、ASTM D3238による%CPが60以上である基油混合物、及び
(B)炭素数8〜22の炭化水素基を有するモノグリセリド(グリセリンの3つのヒドロキシル基のうち1つに脂肪酸がエステル結合したグリセリン脂肪酸エステル)であり、水酸基価150〜300mgKOH/gであることを特徴とするモノグリセリドを、組成物全量基準で0.3〜2.0質量%、
を含有することを特徴とする内燃機関用潤滑油組成物。 - 前記(A)基油混合物が、API(米国石油協会)のグループ1に分類される基油であって、100℃における動粘度が3〜12mm2/s、粘度指数が90〜120、硫黄分が0.03〜0.7質量%、ASTM D3238による%CAが5以下、及び、ASTM D3238による%CPが60以上である基油を、組成物全量基準で25〜50質量%配合させた基油混合物であることを特徴とする、請求項1に記載の内燃機関用潤滑油組成物。
- 前記(B)モノグリセリドがグリセリンモノオレエ−トであることを特徴とする、請求項1又は2に記載の内燃機関用潤滑油組成物。
- 100℃における動粘度が5.6〜15mm2/sであることを特徴とする、請求項1〜3のいずれか一項に記載の内燃機関用潤滑油組成物。
- H/Cの比が1.93〜4である燃料を使用する内燃機関、アイドリングストップ装置が付いた車両の内燃機関、或いは、バイオ燃料又はバイオディーゼル燃料を配合した燃料を使用する内燃機関で用いられることを特徴とする、請求項1〜4のいずれか一項に記載の内燃機関用潤滑油組成物。
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