EP3109300A1 - Silicone grease composition - Google Patents
Silicone grease composition Download PDFInfo
- Publication number
- EP3109300A1 EP3109300A1 EP15751845.7A EP15751845A EP3109300A1 EP 3109300 A1 EP3109300 A1 EP 3109300A1 EP 15751845 A EP15751845 A EP 15751845A EP 3109300 A1 EP3109300 A1 EP 3109300A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oxide
- mass
- grease composition
- silicone
- base oil
- 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 52
- 239000004519 grease Substances 0.000 title claims abstract description 46
- 229920001296 polysiloxane Polymers 0.000 title claims abstract description 22
- 239000002199 base oil Substances 0.000 claims abstract description 32
- 229920002545 silicone oil Polymers 0.000 claims abstract description 32
- 239000002562 thickening agent Substances 0.000 claims abstract description 23
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 21
- 239000003607 modifier Substances 0.000 claims abstract description 16
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 16
- 239000000395 magnesium oxide Substances 0.000 claims description 10
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 10
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical group [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 10
- 229910000476 molybdenum oxide Inorganic materials 0.000 claims description 8
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical compound [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 claims description 8
- 239000011787 zinc oxide Substances 0.000 claims description 8
- 230000003449 preventive effect Effects 0.000 abstract description 8
- XMKLTEGSALONPH-UHFFFAOYSA-N 1,2,4,5-tetrazinane-3,6-dione Chemical class O=C1NNC(=O)NN1 XMKLTEGSALONPH-UHFFFAOYSA-N 0.000 description 17
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 14
- PAFZNILMFXTMIY-UHFFFAOYSA-N cyclohexylamine Chemical compound NC1CCCCC1 PAFZNILMFXTMIY-UHFFFAOYSA-N 0.000 description 12
- -1 methyl hydrogen Chemical class 0.000 description 12
- 239000002245 particle Substances 0.000 description 10
- 125000002723 alicyclic group Chemical group 0.000 description 9
- 125000001931 aliphatic group Chemical group 0.000 description 9
- 238000005299 abrasion Methods 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 7
- LAQFLZHBVPULPL-UHFFFAOYSA-N methyl(phenyl)silicon Chemical compound C[Si]C1=CC=CC=C1 LAQFLZHBVPULPL-UHFFFAOYSA-N 0.000 description 7
- 125000000962 organic group Chemical group 0.000 description 7
- REYJJPSVUYRZGE-UHFFFAOYSA-N Octadecylamine Chemical compound CCCCCCCCCCCCCCCCCCN REYJJPSVUYRZGE-UHFFFAOYSA-N 0.000 description 6
- 239000000654 additive Substances 0.000 description 6
- 238000005461 lubrication Methods 0.000 description 6
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000344 soap Substances 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- FJLUATLTXUNBOT-UHFFFAOYSA-N 1-Hexadecylamine Chemical compound CCCCCCCCCCCCCCCCN FJLUATLTXUNBOT-UHFFFAOYSA-N 0.000 description 3
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 3
- JRBPAEWTRLWTQC-UHFFFAOYSA-N dodecylamine Chemical compound CCCCCCCCCCCCN JRBPAEWTRLWTQC-UHFFFAOYSA-N 0.000 description 3
- IOQPZZOEVPZRBK-UHFFFAOYSA-N octan-1-amine Chemical compound CCCCCCCCN IOQPZZOEVPZRBK-UHFFFAOYSA-N 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 150000004982 aromatic amines Chemical class 0.000 description 2
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 description 2
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 125000005442 diisocyanate group Chemical group 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 235000019198 oils Nutrition 0.000 description 2
- RZXMPPFPUUCRFN-UHFFFAOYSA-N p-toluidine Chemical compound CC1=CC=C(N)C=C1 RZXMPPFPUUCRFN-UHFFFAOYSA-N 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229920003216 poly(methylphenylsiloxane) Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- NDVLTYZPCACLMA-UHFFFAOYSA-N silver oxide Chemical compound [O-2].[Ag+].[Ag+] NDVLTYZPCACLMA-UHFFFAOYSA-N 0.000 description 2
- IATRAKWUXMZMIY-UHFFFAOYSA-N strontium oxide Chemical compound [O-2].[Sr+2] IATRAKWUXMZMIY-UHFFFAOYSA-N 0.000 description 2
- 150000003672 ureas Chemical class 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- QGLWBTPVKHMVHM-KTKRTIGZSA-N (z)-octadec-9-en-1-amine Chemical compound CCCCCCCC\C=C/CCCCCCCCN QGLWBTPVKHMVHM-KTKRTIGZSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- AFBPFSWMIHJQDM-UHFFFAOYSA-N N-methyl-N-phenylamine Natural products CNC1=CC=CC=C1 AFBPFSWMIHJQDM-UHFFFAOYSA-N 0.000 description 1
- 229910007161 Si(CH3)3 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 description 1
- 150000004996 alkyl benzenes Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000010775 animal oil Substances 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 229910000410 antimony oxide Inorganic materials 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 229910000428 cobalt oxide Inorganic materials 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 150000005690 diesters Chemical class 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910001195 gallium oxide Inorganic materials 0.000 description 1
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium oxide Inorganic materials O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 1
- 229910000449 hafnium oxide Inorganic materials 0.000 description 1
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 description 1
- 125000001183 hydrocarbyl group Chemical group 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910003437 indium oxide Inorganic materials 0.000 description 1
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910000464 lead oxide Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- ZQKXQUJXLSSJCH-UHFFFAOYSA-N melamine cyanurate Chemical compound NC1=NC(N)=NC(N)=N1.O=C1NC(=O)NC(=O)N1 ZQKXQUJXLSSJCH-UHFFFAOYSA-N 0.000 description 1
- 239000006078 metal deactivator Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- 229910000484 niobium oxide Inorganic materials 0.000 description 1
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 description 1
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 description 1
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 description 1
- PVADDRMAFCOOPC-UHFFFAOYSA-N oxogermanium Chemical compound [Ge]=O PVADDRMAFCOOPC-UHFFFAOYSA-N 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- HBEQXAKJSGXAIQ-UHFFFAOYSA-N oxopalladium Chemical compound [Pd]=O HBEQXAKJSGXAIQ-UHFFFAOYSA-N 0.000 description 1
- DYIZHKNUQPHNJY-UHFFFAOYSA-N oxorhenium Chemical compound [Re]=O DYIZHKNUQPHNJY-UHFFFAOYSA-N 0.000 description 1
- SJLOMQIUPFZJAN-UHFFFAOYSA-N oxorhodium Chemical compound [Rh]=O SJLOMQIUPFZJAN-UHFFFAOYSA-N 0.000 description 1
- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 229910003445 palladium oxide Inorganic materials 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920013639 polyalphaolefin Polymers 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 229920013636 polyphenyl ether polymer Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001289 polyvinyl ether Polymers 0.000 description 1
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 1
- 229910001950 potassium oxide Inorganic materials 0.000 description 1
- 239000011369 resultant mixture Substances 0.000 description 1
- 229910003449 rhenium oxide Inorganic materials 0.000 description 1
- 229910003450 rhodium oxide Inorganic materials 0.000 description 1
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 1
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- HYXGAEYDKFCVMU-UHFFFAOYSA-N scandium oxide Chemical compound O=[Sc]O[Sc]=O HYXGAEYDKFCVMU-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229910001923 silver oxide Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 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
- 229910001936 tantalum oxide Inorganic materials 0.000 description 1
- IOWOAQVVLHHFTL-UHFFFAOYSA-N technetium(vii) oxide Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Tc+7].[Tc+7] IOWOAQVVLHHFTL-UHFFFAOYSA-N 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
- C10M107/50—Lubricating compositions characterised by the base-material being a macromolecular compound containing silicon
-
- 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
- C10M115/00—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof
- C10M115/08—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof containing nitrogen
-
- 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
- C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
- C10M125/10—Metal oxides, hydroxides, carbonates or bicarbonates
-
- 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
-
- 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
- C10M169/02—Mixtures of base-materials and thickeners
-
- 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
- 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
- C10M169/06—Mixtures of thickeners 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
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/061—Carbides; Hydrides; Nitrides
-
- 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
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/062—Oxides; Hydroxides; Carbonates or bicarbonates
-
- 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
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/10—Compounds containing silicon
- C10M2201/1006—Compounds containing silicon 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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/10—Amides of carbonic or haloformic acids
- C10M2215/102—Ureas; Semicarbazides; Allophanates
- C10M2215/1026—Ureas; Semicarbazides; Allophanates used as thickening material
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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
- C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
- C10M2227/04—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions having a silicon-to-carbon bond, e.g. organo-silanes
- C10M2227/045—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions having a silicon-to-carbon bond, e.g. organo-silanes 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
- C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
- C10M2229/04—Siloxanes with specific structure
- C10M2229/041—Siloxanes with specific structure containing aliphatic substituents
- C10M2229/0415—Siloxanes with specific structure containing aliphatic substituents 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
- C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
- C10M2229/04—Siloxanes with specific structure
- C10M2229/042—Siloxanes with specific structure containing aromatic substituents
- C10M2229/0425—Siloxanes with specific structure containing aromatic substituents used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/055—Particles related characteristics
- C10N2020/06—Particles of special shape or size
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/10—Semi-solids; greasy
Definitions
- the present invention relates to a silicone composition. More particularly, the invention relates to a silicone grease composition suitably used for the parts to be lubricated, to be more specific, the lubrication parts of the clutch, the torque limiter mechanism and the like where high coefficient of friction and excellent wear preventive characteristics are needed.
- the clutch of the engine starter is composed of a clutch outer, a clutch inner, a roller disposed in a wedge-like space formed between the clutch outer and the clutch inner to transmit the rotation of the clutch outer to the clutch inner, and a spring which works to urge the roller toward the narrower side of the wedge-like space.
- the roller moves toward the narrower side of the wedge-like space and is then caught between the clutch outer and the clutch inner, thereby transmitting the rotation to the clutch inner (torque-transmitted state). Accordingly, the grease composition used for such portions requires a high coefficient of friction to prevent the slippage of the clutch outer, the clutch inner and the roller.
- silicone grease compositions are conventionally known: a grease for the overrunning clutch ( JP (Hei) 7-35824 B ) where a base oil comprising a silicone oil has a coefficient of friction of 0.18 or more; grease compositions ( JP (Hei) 5-230486 A and JP (Hei) 6-279777 A ) comprising as the base oil organopolysiloxanes having a predetermined ratio of phenyl group or methyl group; and a traction grease composition ( JP 2003-176489 A ) comprising finely-divided particles of metallic oxide, a thickener, and a base oil containing a dimethyl silicone oil with a predetermined kinematic viscosity in an amount of 1 to 40 mass%.
- Those grease compositions make use of the advantages of the silicone oils that the coefficients of friction are high, and in addition, the surface tensions of the silicone oils range from 20 to 25 dyn/cm2, which are lower than those of other oils, so that a lubrication film may not readily be formed, thereby easily attaining to boundary lubrication.
- the clutch and the torque limiter mechanism are required to be smaller in size and lighter in weight in line with the recent tendency toward weight reduction in the automobile, and on the other hand, they are exposed to severer operating conditions. Especially, satisfactory torque transmission properties are demanded even when the operating conditions become more and more tough. For that reason, the grease composition is required to have a higher coefficient of friction. At the same time, the wear preventive characteristics are also needed when the grease composition is used for the clutch and the torque limiter mechanism.
- an object of the invention is to provide a silicone grease composition having improved frictional characteristics, without deterioration of the wear preventive characteristics.
- the inventors of the present invention contrived a grease composition having an increased coefficient of friction without decrease of the wear preventive characteristics by adding as the friction modifier a metallic oxide with a Mohs hardness of 6 or less.
- the invention provides a grease composition as shown below.
- a silicone grease composition where the frictional characteristics are improved without decrease of the wear preventive characteristics can be provided.
- a silicone oil is used for the base oil in the grease composition according to the invention.
- silicone oil examples include dimethyl silicone oil, methylphenyl silicone oil (phenyl-modified silicone oil), methyl hydrogen silicone oil, polyether-modified silicone oil, aralkyl-modified silicone oil, fluoroalkyl-modified silicone oil, alkyl-modified silicone oil, fatty acid ester-modified silicone oil, and the like.
- dimethyl silicone oil and methylphenyl silicone oil are preferably used.
- the silicone oil represented by the following general formula (1) is particularly preferable: (CH 3 ) 3 SiO-[-Si(R1)(R2)-O-]n - Si(CH 3 ) 3 (1) wherein R1 and R2 are each independently methyl group or phenyl group, the ratio of methyl group to the whole organic groups being 50 to 100 mol.%.
- the kinematic viscosity of the silicone oil is not particularly limited, but may preferably be in the range of 20 to 10,000 mm 2 /s, more preferably 50 to 2,000 mm 2 /s at 25°C.
- the kinematic viscosity of the silicone oil is less than 20 mm 2 /s, the base oil may easily separate from the grease.
- the kinematic viscosity exceeds 10,000 mm 2 /s, the torque will increase at low temperatures due to the viscosity resistance. In any case, the results are practically undesirable.
- R1 and R2 are each independently methyl group or phenyl group, the ratio of the methyl group to the whole organic groups being 50 to 100 mol.%.
- the ratio of the methyl group to the whole organic groups may preferably be 60 to 100 mol.%, more preferably 80 to 98 mol.%, and still more preferably 90 to 95 mol.%.
- the silicone oil may preferably be contained in an amount of 55 to 90 mass%, and more preferably 70 to 90 mass%, with respect to the total mass of the composition. Such a content of the silicone oil can favorably lead to high coefficient of friction.
- the silicone oil may be used in combination with other base oil components so long as the performance of the silicone oil may not be impaired.
- One or more base oil components selected from the group consisting of mineral oils, poly ⁇ -olefins, polybutene, alkylbenzene, animal and vegetable oils, organic acid esters, diesters, polyol esters, polyalkylene glycols, polyvinyl ethers, polyphenyl ethers, and alkylphenyl ethers can be used.
- the amount of other base oil component(s) that can be used in combination with the silicone oil may preferably be 0 to 50 mass% with respect to the mass of the silicone oil used for the base oil.
- the amount of other base oil component(s) may preferably be 0 to 20 mass%, more preferably 0 to 10 mass%, with respect to the mass of the lubricating base oil used in the invention. It is most preferable to use no other base oil component.
- the thickener used for the grease composition of the invention is not particularly limited. Specific examples include soap type thickeners such as lithium soaps and lithium complex soaps, urea type thickeners such as diurea compounds, inorganic thickeners such as organoclay and silica, organic thickeners such as polytetrafluoroethylene and melamine cyanurate, and the like. At least one selected from the above-mentioned group may be used. It is preferable to select from the group consisting of silica, lithium soaps, lithium complex soaps and urea compounds. In particular, the urea compounds are preferable.
- diurea compounds are preferable, and in particular the diurea compounds represented by the following general formula (2) are preferred: R3-NHCONH-R4-NHCONH-R5 (2) wherein R3 and R5, which may be the same or different from each other, each represent a residue of monovalent hydrocarbon groups having 4 to 20 carbon atoms, for example, aliphatic hydrocarbon groups, alicyclic hydrocarbon groups and aromatic hydrocarbon groups; and R4 is a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms.
- the above-mentioned diurea thickener can be obtained by reacting a predetermined diisocyanate with a predetermined monoamine in the base oil, for example.
- a predetermined diisocyanate include diphenylmethane-4,4'-diisocyanate and tolylene diisocyanate.
- the monoamine include aliphatic amines, aromatic amines and alicyclic amines, or the mixtures thereof.
- Specific examples of the aliphatic amines include octylamine, dodecylamine, hexadecylamine, octadecylamine, and oleylamine.
- Specific examples of the aromatic amines include aniline and p-toluidine.
- alicyclic amines include cyclohexylamine.
- cyclohexylamine, octylamine, dodecylamine, hexadecylamine, octadecylamine, or the mixture thereof may preferably be used for preparation of the diurea thickener.
- alicyclic aliphatic diurea compounds are preferred which can be obtained by using cyclohexylamine together with octylamine, dodecylamine, hexadecylamine, octadecylamine or the mixture thereof.
- alicyclic aliphatic diurea compounds obtained from cyclohexylamine and octadecylamine, or the mixtures thereof are particularly preferable.
- a mixture of the following three kinds of diurea compounds represented by formula (2-1), (2-2) and (2-3) (where R is octadecyl group) is most preferable.
- the content of the thickener which may appropriately be adjusted in accordance with the desired consistency is generally 2 to 35 mass%, preferably 5 to 30 mass%, and more preferably 10 to 25 mass%.
- the resultant product becomes a liquid, which cannot be used as a grease.
- the content of the thickener exceeds 35 mass%, the resultant grease is not practically desirable because the grease is so hard that the torque will increase at low temperatures.
- the grease composition of the invention comprises as the friction modifier a metallic oxide with a Mohs hardness of 6 or less.
- the addition of the metallic oxide as the friction modifier can increase the coefficient of friction because the oil film becomes easy to break due to the metallic oxide entering into the surfaces to be lubricated. Even when the lubrication member is made of steel, use of the metallic oxide with a Mohs hardness of 6 or less can increase the coefficient of friction, with damage to the steel being minimized.
- magnesium oxide, potassium oxide, calcium oxide, scandium oxide, titanium oxide, vanadium oxide, chromium oxide, manganese oxide, iron oxide, cobalt oxide, nickel oxide, copper oxide, zinc oxide, gallium oxide, germanium oxide, strontium oxide, yttrium oxide, zirconium oxide, niobium oxide, molybdenum oxide, technetium oxide, ruthenium oxide, rhodium oxide, palladium oxide, silver oxide, indium oxide, tin oxide, antimony oxide, tellurium oxide, barium oxide, hafnium oxide, tantalum oxide, tungsten oxide, rhenium oxide, lead oxide, and silicon oxide can be used.
- magnesium oxide, zinc oxide and molybdenum oxide are preferable.
- the Mohs hardness of the metallic oxide is preferably 6 or less, more preferably 2 to 6, and still more preferably 4 to 6.
- the Mohs hardness of more than 6 is not favorable because the abrasion will become harsh during the idling operation in the torque non-transmitted state.
- the metallic oxide may preferably have an average particle diameter of 10 ⁇ m or less, more preferably 5 ⁇ m or less, and still more preferably 2 ⁇ m or less. When the average particle diameter exceeds 10 ⁇ m, it becomes difficult for the metallic oxide particles to come between the surfaces to be lubricated, and therefore a sufficient effect cannot be expected.
- the BET conversion method by N 2 -adsorption may be used to determine the average particle diameter herein used.
- the metallic oxide may preferably be contained in an amount of 0.1 to 10.0 mass%, more preferably 0.3 to 7.0 mass%, still more preferably 0.5 to 5.0 mass%, and most preferably 1.0 to 3.0 mass%, based on the total mass of the composition.
- 0.1 mass% a sufficient effect cannot be expected.
- the content of the metallic oxide exceeds 10.0 mass%, the cost will be disadvantageous because the effect is saturated.
- auxiliary additives may be used alone or in combination.
- the auxiliary additives may be added if necessary, and in this case, the contents may be 0.01 to 10 mass% generally. However, the contents of those additives are not particularly limited as far as the effects of the invention are not degraded.
- the grease composition of the invention may preferably have a worked penetration of 200 to 400, more preferably 230 to 380, and most preferably 250 to 350.
- the silicone grease composition comprises; a mixture of three kinds of diurea compounds represented by the above-mentioned formulas (2-1), (2-2) and (2-3) as a thickener, a base oil consisting of the silicone oil represented by the above-mentioned formula (1), with no other base oil component being added, and magnesium oxide, zinc oxide or molybdenum oxide as a friction modifier.
- the silicone grease composition comprise a mixture of three kinds of diurea compounds represented by the above-mentioned formulas (2-1), (2-2) and (2-3) as the thickener; the base oil consisting of the silicone oil represented by the above-mentioned formula (1) where R1 and R2 are each independently methyl group or phenyl group, with the ratio of methyl group to the whole organic groups being 50 to 100 mol.%, with no other base oil component being added; and magnesium oxide or zinc oxide or molybdenum oxide as the friction modifier, with the amount of the friction modifier being 0.1 to 10 mass% based on the total mass of the composition.
- the silicone grease composition comprise a mixture of three kinds of diurea compounds represented by the above-mentioned formulas (2-1), (2-2) and (2-3) as the thickener; the base oil consisting of the silicone oil represented by the above-mentioned formula (1) where R1 and R2 are each independently methyl group or phenyl group, with the ratio of methyl group to the whole organic groups being 95 mol.%, with no other base oil component being added; and magnesium oxide as the friction modifier, with the amount of the friction modifier being 1.0 to 3.0 mass% based on the total mass of the composition.
- the silicone grease composition of the invention can be suitably used for the portions to be lubricated where a high coefficient of friction and excellent wear preventive characteristics are needed, to be more specific, the portions of clutch and torque limiter mechanism. More specifically, the silicone grease composition of the invention is usable for the overrunning clutch of automobile starters, the one way clutch of office equipment, a variety of traction driving mechanisms, and the like. Desirably, the surface of the portions to be lubricated may be a member made of steel.
- Magnesium oxide (Mohs hardness: 5-6; Average particle diameter: 0.5 ⁇ m) Zinc oxide (Mohs hardness: 4-5; Average particle diameter: 0.2 ⁇ m) Molybdenum oxide (Mohs hardness: 2-3; Average particle diameter: 2.1 ⁇ m) Titanium oxide (Mohs hardness: 7-8; Average particle diameter: 0.15 ⁇ m) Boron nitride (Mohs hardness: 10; Average particle diameter: 4 ⁇ m)
- amines i.e., cyclohexylamine and octadecylamine
- diphenylmethane diisocyanate in the base oil to prepare a base grease.
- the resultant mixture was subjected to a milling treatment so as to have a worked penetration of 300 (JIS K2220), thereby obtaining a grease composition.
- test pieces and the test conditions are as shown below.
- test was conducted using a LFW#1 test machine as prescribed in ASTM D2714. A load was applied to a roller against a ring. The test machine rotated the ring to determine the abrasion occurring on the roller using a micrometer. The test pieces and the test conditions are as shown below.
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Abstract
Description
- The present invention relates to a silicone composition. More particularly, the invention relates to a silicone grease composition suitably used for the parts to be lubricated, to be more specific, the lubrication parts of the clutch, the torque limiter mechanism and the like where high coefficient of friction and excellent wear preventive characteristics are needed.
- In consideration of the global environmental problems, weight reduction of the automobile has been advancing. In line with this tendency, a variety of portions tend to use more clutches and torque limiter mechanisms than ever. Of such a variety of clutches and torque limiter mechanisms using the grease composition in the automobile, the engine starter clutch is exposed to the highest torque and the severest operating conditions.
- The clutch of the engine starter is composed of a clutch outer, a clutch inner, a roller disposed in a wedge-like space formed between the clutch outer and the clutch inner to transmit the rotation of the clutch outer to the clutch inner, and a spring which works to urge the roller toward the narrower side of the wedge-like space. When the clutch outer is rotated, the roller moves toward the narrower side of the wedge-like space and is then caught between the clutch outer and the clutch inner, thereby transmitting the rotation to the clutch inner (torque-transmitted state). Accordingly, the grease composition used for such portions requires a high coefficient of friction to prevent the slippage of the clutch outer, the clutch inner and the roller.
- The following silicone grease compositions are conventionally known: a grease for the overrunning clutch (
JP (Hei) 7-35824 B JP (Hei) 5-230486 A JP (Hei) 6-279777 A JP 2003-176489 A - When the rotational speed of the clutch inner becomes higher than that of the clutch outer, the roller automatically moves toward a wider side of the wedge-like space as compressing the spring, thereby stopping the transmission of the rotation (torque non-transmitted state). Under such conditions, the clutch outer, the clutch inner and the roller reach a state of slippage due to generation of the relative rotation. In light of this, the grease composition used for such portions is required to have wear preventive characteristics.
- As previously explained, the clutch and the torque limiter mechanism are required to be smaller in size and lighter in weight in line with the recent tendency toward weight reduction in the automobile, and on the other hand, they are exposed to severer operating conditions. Especially, satisfactory torque transmission properties are demanded even when the operating conditions become more and more tough. For that reason, the grease composition is required to have a higher coefficient of friction. At the same time, the wear preventive characteristics are also needed when the grease composition is used for the clutch and the torque limiter mechanism.
- Accordingly, an object of the invention is to provide a silicone grease composition having improved frictional characteristics, without deterioration of the wear preventive characteristics.
- To solve the above-mentioned problems, the inventors of the present invention contrived a grease composition having an increased coefficient of friction without decrease of the wear preventive characteristics by adding as the friction modifier a metallic oxide with a Mohs hardness of 6 or less.
- Namely, the invention provides a grease composition as shown below.
- 1. A silicone grease composition comprising a thickener, a base oil comprising a silicone oil in an amount of 50 mass% or more of the total mass of the base oil, and a friction modifier comprising a metallic oxide with a Mohs hardness of 6 or less.
- 2. The silicone grease composition described in the above-mentioned item 1, wherein the metallic oxide has a Mohs hardness of 2 to 6.
- 3. The silicone grease composition described in the above-mentioned item 1 or 2, wherein the metallic oxide is magnesium oxide, zinc oxide or molybdenum oxide.
- 4. The silicone grease composition described in any one of the above-mentioned items 1 to 3, wherein the metallic oxide is contained in an amount of 0.1 to 10 mass% based on the total mass of the composition.
- According to the invention, a silicone grease composition where the frictional characteristics are improved without decrease of the wear preventive characteristics can be provided.
- A silicone oil is used for the base oil in the grease composition according to the invention.
- Specific examples of the silicone oil include dimethyl silicone oil, methylphenyl silicone oil (phenyl-modified silicone oil), methyl hydrogen silicone oil, polyether-modified silicone oil, aralkyl-modified silicone oil, fluoroalkyl-modified silicone oil, alkyl-modified silicone oil, fatty acid ester-modified silicone oil, and the like. Of the above silicone oils, dimethyl silicone oil and methylphenyl silicone oil are preferably used. The silicone oil represented by the following general formula (1) is particularly preferable:
(CH3)3SiO-[-Si(R1)(R2)-O-]n - Si(CH3)3 (1)
wherein R1 and R2 are each independently methyl group or phenyl group, the ratio of methyl group to the whole organic groups being 50 to 100 mol.%. - The kinematic viscosity of the silicone oil is not particularly limited, but may preferably be in the range of 20 to 10,000 mm2/s, more preferably 50 to 2,000 mm2/s at 25°C. When the kinematic viscosity of the silicone oil is less than 20 mm2/s, the base oil may easily separate from the grease. When the kinematic viscosity exceeds 10,000 mm2/s, the torque will increase at low temperatures due to the viscosity resistance. In any case, the results are practically undesirable.
- In the above-mentioned formula (1), R1 and R2 are each independently methyl group or phenyl group, the ratio of the methyl group to the whole organic groups being 50 to 100 mol.%. When the molar ratio of the methyl group to the whole organic groups is less than 50 mol.%, the viscosity greatly varies depending on the temperature, and the pour point increases and the torque becomes large at low temperatures. The ratio of the methyl group to the whole organic groups may preferably be 60 to 100 mol.%, more preferably 80 to 98 mol.%, and still more preferably 90 to 95 mol.%.
- The silicone oil may preferably be contained in an amount of 55 to 90 mass%, and more preferably 70 to 90 mass%, with respect to the total mass of the composition. Such a content of the silicone oil can favorably lead to high coefficient of friction.
- The silicone oil may be used in combination with other base oil components so long as the performance of the silicone oil may not be impaired. One or more base oil components selected from the group consisting of mineral oils, poly α-olefins, polybutene, alkylbenzene, animal and vegetable oils, organic acid esters, diesters, polyol esters, polyalkylene glycols, polyvinyl ethers, polyphenyl ethers, and alkylphenyl ethers can be used. The amount of other base oil component(s) that can be used in combination with the silicone oil may preferably be 0 to 50 mass% with respect to the mass of the silicone oil used for the base oil. In order not to decrease the high coefficient of friction, the amount of other base oil component(s) may preferably be 0 to 20 mass%, more preferably 0 to 10 mass%, with respect to the mass of the lubricating base oil used in the invention. It is most preferable to use no other base oil component.
- The thickener used for the grease composition of the invention is not particularly limited. Specific examples include soap type thickeners such as lithium soaps and lithium complex soaps, urea type thickeners such as diurea compounds, inorganic thickeners such as organoclay and silica, organic thickeners such as polytetrafluoroethylene and melamine cyanurate, and the like. At least one selected from the above-mentioned group may be used. It is preferable to select from the group consisting of silica, lithium soaps, lithium complex soaps and urea compounds. In particular, the urea compounds are preferable. As the urea type thickener, diurea compounds are preferable, and in particular the diurea compounds represented by the following general formula (2) are preferred:
R3-NHCONH-R4-NHCONH-R5 (2)
wherein R3 and R5, which may be the same or different from each other, each represent a residue of monovalent hydrocarbon groups having 4 to 20 carbon atoms, for example, aliphatic hydrocarbon groups, alicyclic hydrocarbon groups and aromatic hydrocarbon groups; and R4 is a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms. - The above-mentioned diurea thickener can be obtained by reacting a predetermined diisocyanate with a predetermined monoamine in the base oil, for example. Specific examples of the preferable diisocyanate include diphenylmethane-4,4'-diisocyanate and tolylene diisocyanate. Examples of the monoamine include aliphatic amines, aromatic amines and alicyclic amines, or the mixtures thereof. Specific examples of the aliphatic amines include octylamine, dodecylamine, hexadecylamine, octadecylamine, and oleylamine. Specific examples of the aromatic amines include aniline and p-toluidine. Specific examples of the alicyclic amines include cyclohexylamine. Of the above-mentioned monoamines, cyclohexylamine, octylamine, dodecylamine, hexadecylamine, octadecylamine, or the mixture thereof may preferably be used for preparation of the diurea thickener. In particular, alicyclic aliphatic diurea compounds are preferred which can be obtained by using cyclohexylamine together with octylamine, dodecylamine, hexadecylamine, octadecylamine or the mixture thereof. Further, alicyclic aliphatic diurea compounds obtained from cyclohexylamine and octadecylamine, or the mixtures thereof are particularly preferable. A mixture of the following three kinds of diurea compounds represented by formula (2-1), (2-2) and (2-3) (where R is octadecyl group) is most preferable.
- The content of the thickener, which may appropriately be adjusted in accordance with the desired consistency is generally 2 to 35 mass%, preferably 5 to 30 mass%, and more preferably 10 to 25 mass%.
- When the content of the thickener is less than 2 mass%, the resultant product becomes a liquid, which cannot be used as a grease. When the content of the thickener exceeds 35 mass%, the resultant grease is not practically desirable because the grease is so hard that the torque will increase at low temperatures.
- The grease composition of the invention comprises as the friction modifier a metallic oxide with a Mohs hardness of 6 or less.
- The addition of the metallic oxide as the friction modifier can increase the coefficient of friction because the oil film becomes easy to break due to the metallic oxide entering into the surfaces to be lubricated. Even when the lubrication member is made of steel, use of the metallic oxide with a Mohs hardness of 6 or less can increase the coefficient of friction, with damage to the steel being minimized.
- More specifically, magnesium oxide, potassium oxide, calcium oxide, scandium oxide, titanium oxide, vanadium oxide, chromium oxide, manganese oxide, iron oxide, cobalt oxide, nickel oxide, copper oxide, zinc oxide, gallium oxide, germanium oxide, strontium oxide, yttrium oxide, zirconium oxide, niobium oxide, molybdenum oxide, technetium oxide, ruthenium oxide, rhodium oxide, palladium oxide, silver oxide, indium oxide, tin oxide, antimony oxide, tellurium oxide, barium oxide, hafnium oxide, tantalum oxide, tungsten oxide, rhenium oxide, lead oxide, and silicon oxide can be used. Particularly, magnesium oxide, zinc oxide and molybdenum oxide are preferable. The Mohs hardness of the metallic oxide is preferably 6 or less, more preferably 2 to 6, and still more preferably 4 to 6. The Mohs hardness of more than 6 is not favorable because the abrasion will become harsh during the idling operation in the torque non-transmitted state.
- The metallic oxide may preferably have an average particle diameter of 10 µm or less, more preferably 5 µm or less, and still more preferably 2 µm or less. When the average particle diameter exceeds 10 µm, it becomes difficult for the metallic oxide particles to come between the surfaces to be lubricated, and therefore a sufficient effect cannot be expected. The BET conversion method by N2-adsorption may be used to determine the average particle diameter herein used.
- The metallic oxide may preferably be contained in an amount of 0.1 to 10.0 mass%, more preferably 0.3 to 7.0 mass%, still more preferably 0.5 to 5.0 mass%, and most preferably 1.0 to 3.0 mass%, based on the total mass of the composition. When the content of the metallic oxide is less than 0.1 mass%, a sufficient effect cannot be expected. When the content of the metallic oxide exceeds 10.0 mass%, the cost will be disadvantageous because the effect is saturated.
- Other additives conventionally used for grease, such as an antioxidant, rust inhibitor, metal deactivator, detergent dispersant, extreme pressure agent, antifoaming agent, demulsifier, oilness improver, solid lubricant and the like may be incorporated. Those auxiliary additives may be used alone or in combination. The auxiliary additives may be added if necessary, and in this case, the contents may be 0.01 to 10 mass% generally. However, the contents of those additives are not particularly limited as far as the effects of the invention are not degraded.
- The grease composition of the invention may preferably have a worked penetration of 200 to 400, more preferably 230 to 380, and most preferably 250 to 350.
- According to one preferable embodiment of the invention, the silicone grease composition comprises; a mixture of three kinds of diurea compounds represented by the above-mentioned formulas (2-1), (2-2) and (2-3) as a thickener, a base oil consisting of the silicone oil represented by the above-mentioned formula (1), with no other base oil component being added, and magnesium oxide, zinc oxide or molybdenum oxide as a friction modifier.
- In the above embodiment, it is more preferable that the silicone grease composition comprise a mixture of three kinds of diurea compounds represented by the above-mentioned formulas (2-1), (2-2) and (2-3) as the thickener; the base oil consisting of the silicone oil represented by the above-mentioned formula (1) where R1 and R2 are each independently methyl group or phenyl group, with the ratio of methyl group to the whole organic groups being 50 to 100 mol.%, with no other base oil component being added; and magnesium oxide or zinc oxide or molybdenum oxide as the friction modifier, with the amount of the friction modifier being 0.1 to 10 mass% based on the total mass of the composition.
- In the above embodiment, it is most preferable that the silicone grease composition comprise a mixture of three kinds of diurea compounds represented by the above-mentioned formulas (2-1), (2-2) and (2-3) as the thickener; the base oil consisting of the silicone oil represented by the above-mentioned formula (1) where R1 and R2 are each independently methyl group or phenyl group, with the ratio of methyl group to the whole organic groups being 95 mol.%, with no other base oil component being added; and magnesium oxide as the friction modifier, with the amount of the friction modifier being 1.0 to 3.0 mass% based on the total mass of the composition.
- The silicone grease composition of the invention can be suitably used for the portions to be lubricated where a high coefficient of friction and excellent wear preventive characteristics are needed, to be more specific, the portions of clutch and torque limiter mechanism. More specifically, the silicone grease composition of the invention is usable for the overrunning clutch of automobile starters, the one way clutch of office equipment, a variety of traction driving mechanisms, and the like. Desirably, the surface of the portions to be lubricated may be a member made of steel.
- A silicone oil of formula (1) where R1 and R2 are each independently methyl group or phenyl group, with the ratio of methyl group to the whole organic groups being 95 mol.% was used.
- An alicyclic aliphatic diurea prepared from diphenylmethane-4,4'-diisocyanate, cyclohexylamine and octadecylamine was used.
- Magnesium oxide (Mohs hardness: 5-6; Average particle diameter: 0.5 µm) Zinc oxide (Mohs hardness: 4-5; Average particle diameter: 0.2 µm) Molybdenum oxide (Mohs hardness: 2-3; Average particle diameter: 2.1 µm) Titanium oxide (Mohs hardness: 7-8; Average particle diameter: 0.15 µm) Boron nitride (Mohs hardness: 10; Average particle diameter: 4 µm)
- Predetermined amounts of amines (i.e., cyclohexylamine and octadecylamine) were reacted with diphenylmethane diisocyanate in the base oil to prepare a base grease. By adding the base oil and other additives to the base grease, the resultant mixture was subjected to a milling treatment so as to have a worked penetration of 300 (JIS K2220), thereby obtaining a grease composition.
- In this test, the lubrication conditions of the clutch in the torque-transmitted state were assumed.
- The test was conducted using a Falex test machine as prescribed in ASTM D2670. A test grease was applied to the journal and the blocks. A predetermined load was applied to both blocks against the journal in advance, and the test machine rotated the journal for one second. The generated frictional force was recorded, and then the initial coefficient of friction was determined 0.001 sec after starting. The test pieces and the test conditions are as shown below.
- Journal: outer diameter 1/4n, SAE 3135 Steel, Rb 87-91
- Blocks: AISI 1137 Steel, Rc 20-24
- Contact pressure: 200 kgf/mm2
- Circumferential speed: 0.096 m/sec
- In this test, the lubrication conditions of the clutch in the torque non-transmitted state were assumed.
- The test was conducted using a LFW#1 test machine as prescribed in ASTM D2714. A load was applied to a roller against a ring. The test machine rotated the ring to determine the abrasion occurring on the roller using a micrometer. The test pieces and the test conditions are as shown below.
- Ring: outer diameter 35 mm x width 8.7 mm, SAE 4620 Steel, Rc 58-63, RMS 6-12
- Roller: Cylindrical roller for roller bearing, diameter 6 mm x 6 mm, SUJ-2
- Contact pressure: 10 kgf/mm2
- Circumferential speed: 12.8 m/sec
- Coefficient of friction:
- oo: 0.030 ≤ µ
- o: 0.025 µ < 0.030
- Δ: 0.020 µ < 0.025
- x: µ < 0.020
- Depth of abrasion
- o: < 6 mm
- x: ≥ 6 mm
- The results are shown in Tables 1 and 2. In the Tables, the amounts of the thickeners and the friction modifiers are expressed by mass%, which is based on the total mass of each grease composition. The balance is occupied by base oil.
[Table 1] Example 1 Example 2 Example 3 Example 4 Thickener Type Alicyclic aliphatic diurea Alicyclic aliphatic diurea Alicyclic aliphatic diurea Alicyclic aliphatic diurea Ratio 15 mass% 14 mass% 15 mass% 15 mass% Type of base oil Methylphenyl silicone Methylphenyl silicone Methylphenyl silicone Methylphenyl silicone Friction modifier Type Magnesium oxide, 1 mass% Magnesium oxide, 3 mass% Zinc oxide, 3 mass% Molybdenum oxide, 3 mass% Mohs hardness 5-6 5-6 4-5 2-3 Coefficient of friction 0.031 ○○ 0.032 ○○ 0.028 ○ 0.022 Δ Depth of abrasion (mm) 4.0 ○ 4.1 ○ 5.5 ○ 3.5 ○ [Table 2] Comparative Example 1 Comparative Example 2 Comparative Example 3 Thickener Type Alicyclic aliphatic diurea Alicyclic aliphatic diurea Alicyclic aliphatic diurea Ratio 15 mass% 15 mass% 16 mass% Base oil Type Methylphenyl silicone Methylphenyl silicone Methylphenyl silicone Friction modifier Type Titanium oxide 3 mass% Boron nitride 3 mass% Mohs hardness 7-8 10 - Coefficient of friction 0.020 Δ 0.030 ○○ 0.018 x Depth of abrasion (mm) 15.0 x 7.2 x 4.8 ○
Claims (4)
- A silicone grease composition comprising a thickener; a base oil comprising a silicone oil in an amount of 50 mass% or more of the total mass of the base oil; and a friction modifier comprising a metallic oxide with a Mohs hardness of 6 or less.
- The silicone grease composition of claim 1 or 2, wherein the metallic oxide has a Mohs hardness of 2 to 6.
- The silicone grease composition of claim 1 or 2, wherein the metallic oxide is magnesium oxide, zinc oxide or molybdenum oxide.
- The silicone grease composition of any one of claims 1 to 3, wherein the metallic oxide is contained in an amount of 0.1 to 10 mass% based on the total mass of the composition.
Applications Claiming Priority (2)
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JP2014028681A JP6383993B2 (en) | 2014-02-18 | 2014-02-18 | Silicone grease composition |
PCT/JP2015/054383 WO2015125805A1 (en) | 2014-02-18 | 2015-02-18 | Silicone grease composition |
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EP3109300A1 true EP3109300A1 (en) | 2016-12-28 |
EP3109300A4 EP3109300A4 (en) | 2017-10-25 |
EP3109300B1 EP3109300B1 (en) | 2020-01-08 |
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EP15751845.7A Active EP3109300B1 (en) | 2014-02-18 | 2015-02-18 | Silicone grease composition |
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US (1) | US20170002285A1 (en) |
EP (1) | EP3109300B1 (en) |
JP (1) | JP6383993B2 (en) |
CN (1) | CN106029851A (en) |
WO (1) | WO2015125805A1 (en) |
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JP6739951B2 (en) * | 2016-03-11 | 2020-08-12 | 株式会社デンソー | Grease composition, mechanical member and starter overrunning clutch |
JP6700074B2 (en) | 2016-03-11 | 2020-05-27 | 株式会社デンソー | Grease composition, mechanical member and starter overrunning clutch |
FI20176129A1 (en) * | 2017-12-15 | 2019-06-16 | Kone Corp | Paste type lubrication |
CN108384605B (en) * | 2018-01-19 | 2021-03-23 | 惠州市阿特斯润滑技术有限公司 | Lubricating grease for automobile ball joint and preparation method thereof |
JP7029972B2 (en) * | 2018-02-07 | 2022-03-04 | Nokクリューバー株式会社 | Lubricating grease composition, clutches and power window motors |
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JPH03106996A (en) * | 1989-09-20 | 1991-05-07 | Hitachi Ltd | Thermally conductive grease composition and computer cooling structure made by using it |
IT1271409B (en) * | 1993-09-13 | 1997-05-28 | Dow Corning | COMPOSITIONS USED AS FATS BASED ON FLUORINATED POLYMER OILS AND HEXAGONAL BORON NITRIDE |
JPH08143883A (en) * | 1994-11-17 | 1996-06-04 | Dow Corning Asia Ltd | Heat-resistant grease composition |
JP3722379B2 (en) * | 1995-08-22 | 2005-11-30 | 日本精工株式会社 | GREASE COMPOSITION FOR ROLLING BEARING AND ROLLING BEARING |
JP3142800B2 (en) * | 1996-08-09 | 2001-03-07 | 信越化学工業株式会社 | Thermal conductive silicone composition, thermal conductive material, and thermal conductive silicone grease |
JP4054923B2 (en) * | 1998-03-23 | 2008-03-05 | 日本精工株式会社 | GREASE COMPOSITION FOR ROLLING BEARING AND ROLLING BEARING |
JP2000109373A (en) * | 1998-10-02 | 2000-04-18 | Shin Etsu Chem Co Ltd | Silicone grease composition for heat dissipation, and semiconductor device using the same |
JP4603700B2 (en) * | 2001-01-04 | 2010-12-22 | 株式会社日立製作所 | High thermal conductive grease composition and cooling device using the same |
JP2003176489A (en) * | 2001-10-04 | 2003-06-24 | Nsk Ltd | Traction grease composition |
JP4130091B2 (en) * | 2002-04-10 | 2008-08-06 | 信越化学工業株式会社 | Silicone grease composition for heat dissipation |
JP2004176075A (en) * | 2004-02-02 | 2004-06-24 | Nsk Ltd | Grease composition for roller bearing and roller bearing |
WO2005083044A1 (en) * | 2004-02-27 | 2005-09-09 | Kyodo Yushi Co., Ltd. | Grease composition for constant velocity joint and constant velocity joint |
JP4951525B2 (en) * | 2004-12-28 | 2012-06-13 | ピレリ・タイヤ・ソチエタ・ペル・アツィオーニ | Method and apparatus for manufacturing a pneumatic tire |
JP4634891B2 (en) * | 2005-08-18 | 2011-02-16 | 信越化学工業株式会社 | Thermally conductive silicone grease composition and cured product thereof |
KR101335867B1 (en) * | 2007-04-13 | 2013-12-02 | 엘지전자 주식회사 | Appartus and method for data updating in display device |
WO2008154997A1 (en) * | 2007-06-20 | 2008-12-24 | KLüBER LUBRICATION MüNCHEN KG | Lubricating grease composition |
JP5214649B2 (en) * | 2010-02-26 | 2013-06-19 | 協同油脂株式会社 | Grease composition for hub unit bearing using angular ball bearing and hub unit bearing |
JP2012224834A (en) * | 2010-10-25 | 2012-11-15 | Toyota Motor Corp | Grease composition |
-
2014
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- 2015-02-18 WO PCT/JP2015/054383 patent/WO2015125805A1/en active Application Filing
- 2015-02-18 US US15/114,139 patent/US20170002285A1/en not_active Abandoned
- 2015-02-18 CN CN201580008816.1A patent/CN106029851A/en active Pending
- 2015-02-18 EP EP15751845.7A patent/EP3109300B1/en active Active
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CN106029851A (en) | 2016-10-12 |
EP3109300B1 (en) | 2020-01-08 |
WO2015125805A1 (en) | 2015-08-27 |
EP3109300A4 (en) | 2017-10-25 |
US20170002285A1 (en) | 2017-01-05 |
JP6383993B2 (en) | 2018-09-05 |
JP2015151516A (en) | 2015-08-24 |
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