US3036972A - Lubricant composition - Google Patents
Lubricant composition Download PDFInfo
- Publication number
- US3036972A US3036972A US723640A US72364058A US3036972A US 3036972 A US3036972 A US 3036972A US 723640 A US723640 A US 723640A US 72364058 A US72364058 A US 72364058A US 3036972 A US3036972 A US 3036972A
- Authority
- US
- United States
- Prior art keywords
- lubricant
- parts
- balls
- rubbing
- polyester
- 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.)
- Expired - Lifetime
Links
- 239000000314 lubricant Substances 0.000 title claims description 120
- 239000000203 mixture Substances 0.000 title claims description 92
- 150000005690 diesters Chemical class 0.000 claims description 29
- 230000001050 lubricating effect Effects 0.000 claims description 21
- 239000000654 additive Substances 0.000 description 46
- 229920000728 polyester Polymers 0.000 description 38
- 238000012360 testing method Methods 0.000 description 35
- -1 polyethylene Polymers 0.000 description 34
- 230000000996 additive effect Effects 0.000 description 24
- 239000002585 base Substances 0.000 description 20
- 238000011068 loading method Methods 0.000 description 20
- 150000001875 compounds Chemical class 0.000 description 18
- 231100000241 scar Toxicity 0.000 description 18
- 239000000463 material Substances 0.000 description 17
- 238000005461 lubrication Methods 0.000 description 15
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 13
- 239000003921 oil Substances 0.000 description 13
- 125000002524 organometallic group Chemical group 0.000 description 13
- VJHINFRRDQUWOJ-UHFFFAOYSA-N dioctyl sebacate Chemical compound CCCCC(CC)COC(=O)CCCCCCCCC(=O)OCC(CC)CCCC VJHINFRRDQUWOJ-UHFFFAOYSA-N 0.000 description 12
- 229910052732 germanium Inorganic materials 0.000 description 12
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 12
- 239000004519 grease Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 11
- 150000002902 organometallic compounds Chemical class 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 10
- 230000005484 gravity Effects 0.000 description 10
- 125000004432 carbon atom Chemical group C* 0.000 description 9
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 9
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 239000000344 soap Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- HIEOGLNFUKBFCF-UHFFFAOYSA-N bis(3-methylbutyl) hexanedioate Chemical compound CC(C)CCOC(=O)CCCCC(=O)OCCC(C)C HIEOGLNFUKBFCF-UHFFFAOYSA-N 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 7
- 238000006731 degradation reaction Methods 0.000 description 7
- 239000010931 gold Substances 0.000 description 7
- 229910052737 gold Inorganic materials 0.000 description 7
- HGPXWXLYXNVULB-UHFFFAOYSA-M lithium stearate Chemical compound [Li+].CCCCCCCCCCCCCCCCCC([O-])=O HGPXWXLYXNVULB-UHFFFAOYSA-M 0.000 description 7
- 125000000082 organogermanium group Chemical group 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 239000002253 acid Substances 0.000 description 6
- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- JJPZOIJCDNHCJP-UHFFFAOYSA-N dibutyl(sulfanylidene)tin Chemical compound CCCC[Sn](=S)CCCC JJPZOIJCDNHCJP-UHFFFAOYSA-N 0.000 description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 6
- NUCFNMOPTGEHQA-UHFFFAOYSA-N 3-bromo-2h-pyrazolo[4,3-c]pyridine Chemical compound C1=NC=C2C(Br)=NNC2=C1 NUCFNMOPTGEHQA-UHFFFAOYSA-N 0.000 description 5
- IYPYKRAEQZVXSC-UHFFFAOYSA-N 4-tert-butyl-2-phenylphenol Chemical compound CC(C)(C)C1=CC=C(O)C(C=2C=CC=CC=2)=C1 IYPYKRAEQZVXSC-UHFFFAOYSA-N 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 5
- 229910052791 calcium Inorganic materials 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 5
- 229920001083 polybutene Polymers 0.000 description 5
- 229940116351 sebacate Drugs 0.000 description 5
- CXMXRPHRNRROMY-UHFFFAOYSA-L sebacate(2-) Chemical compound [O-]C(=O)CCCCCCCCC([O-])=O CXMXRPHRNRROMY-UHFFFAOYSA-L 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- WLJVNTCWHIRURA-UHFFFAOYSA-N Heptanedioic acid Natural products OC(=O)CCCCCC(O)=O WLJVNTCWHIRURA-UHFFFAOYSA-N 0.000 description 4
- TYFQFVWCELRYAO-UHFFFAOYSA-N Suberic acid Natural products OC(=O)CCCCCCC(O)=O TYFQFVWCELRYAO-UHFFFAOYSA-N 0.000 description 4
- 125000001931 aliphatic group Chemical group 0.000 description 4
- 125000000217 alkyl group Chemical group 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- FLKPEMZONWLCSK-UHFFFAOYSA-N diethyl phthalate Chemical compound CCOC(=O)C1=CC=CC=C1C(=O)OCC FLKPEMZONWLCSK-UHFFFAOYSA-N 0.000 description 4
- 150000002148 esters Chemical class 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- WNLRTRBMVRJNCN-UHFFFAOYSA-N hexanedioic acid Natural products OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 4
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 3
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 150000001298 alcohols Chemical class 0.000 description 3
- 229940067597 azelate Drugs 0.000 description 3
- SAOKZLXYCUGLFA-UHFFFAOYSA-N bis(2-ethylhexyl) adipate Chemical compound CCCCC(CC)COC(=O)CCCCC(=O)OCC(CC)CCCC SAOKZLXYCUGLFA-UHFFFAOYSA-N 0.000 description 3
- CJFLBOQMPJCWLR-UHFFFAOYSA-N bis(6-methylheptyl) hexanedioate Chemical compound CC(C)CCCCCOC(=O)CCCCC(=O)OCCCCCC(C)C CJFLBOQMPJCWLR-UHFFFAOYSA-N 0.000 description 3
- 239000010951 brass Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- UAKYREKCWXBHCW-UHFFFAOYSA-N dipentan-2-yl decanedioate Chemical compound CCCC(C)OC(=O)CCCCCCCCC(=O)OC(C)CCC UAKYREKCWXBHCW-UHFFFAOYSA-N 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000003879 lubricant additive Substances 0.000 description 3
- 150000002762 monocarboxylic acid derivatives Chemical class 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 3
- QFHSCXCXQGZXAX-UHFFFAOYSA-N oxo(dipropyl)germane Chemical compound C(CC)[Ge](CCC)=O QFHSCXCXQGZXAX-UHFFFAOYSA-N 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 229940114926 stearate Drugs 0.000 description 3
- QQXSEZVCKAEYQJ-UHFFFAOYSA-N tetraethylgermanium Chemical compound CC[Ge](CC)(CC)CC QQXSEZVCKAEYQJ-UHFFFAOYSA-N 0.000 description 3
- VXKWYPOMXBVZSJ-UHFFFAOYSA-N tetramethyltin Chemical compound C[Sn](C)(C)C VXKWYPOMXBVZSJ-UHFFFAOYSA-N 0.000 description 3
- IFUCAAMZMJICIP-UHFFFAOYSA-N triethylgermanium Chemical compound CC[Ge](CC)CC.CC[Ge](CC)CC IFUCAAMZMJICIP-UHFFFAOYSA-N 0.000 description 3
- 125000005023 xylyl group Chemical group 0.000 description 3
- HFVMEOPYDLEHBR-UHFFFAOYSA-N (2-fluorophenyl)-phenylmethanol Chemical compound C=1C=CC=C(F)C=1C(O)C1=CC=CC=C1 HFVMEOPYDLEHBR-UHFFFAOYSA-N 0.000 description 2
- OBETXYAYXDNJHR-UHFFFAOYSA-N 2-Ethylhexanoic acid Chemical compound CCCCC(CC)C(O)=O OBETXYAYXDNJHR-UHFFFAOYSA-N 0.000 description 2
- YIWUKEYIRIRTPP-UHFFFAOYSA-N 2-ethylhexan-1-ol Chemical compound CCCCC(CC)CO YIWUKEYIRIRTPP-UHFFFAOYSA-N 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- GCTFWCDSFPMHHS-UHFFFAOYSA-M Tributyltin chloride Chemical compound CCCC[Sn](Cl)(CCCC)CCCC GCTFWCDSFPMHHS-UHFFFAOYSA-M 0.000 description 2
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- UJMDYLWCYJJYMO-UHFFFAOYSA-N benzene-1,2,3-tricarboxylic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1C(O)=O UJMDYLWCYJJYMO-UHFFFAOYSA-N 0.000 description 2
- BSJVZANRYHAYEA-UHFFFAOYSA-N bis(2-ethylbutyl) hexanedioate Chemical compound CCC(CC)COC(=O)CCCCC(=O)OCC(CC)CC BSJVZANRYHAYEA-UHFFFAOYSA-N 0.000 description 2
- ZDWGXBPVPXVXMQ-UHFFFAOYSA-N bis(2-ethylhexyl) nonanedioate Chemical compound CCCCC(CC)COC(=O)CCCCCCCC(=O)OCC(CC)CCCC ZDWGXBPVPXVXMQ-UHFFFAOYSA-N 0.000 description 2
- ABXLQQAKBRIHIT-UHFFFAOYSA-N bis(2-ethylhexyl) pentanedioate Chemical compound CCCCC(CC)COC(=O)CCCC(=O)OCC(CC)CCCC ABXLQQAKBRIHIT-UHFFFAOYSA-N 0.000 description 2
- SHZIWNPUGXLXDT-UHFFFAOYSA-N caproic acid ethyl ester Natural products CCCCCC(=O)OCC SHZIWNPUGXLXDT-UHFFFAOYSA-N 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- LJOODBDWMQKMFB-UHFFFAOYSA-N cyclohexylacetic acid Chemical compound OC(=O)CC1CCCCC1 LJOODBDWMQKMFB-UHFFFAOYSA-N 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 150000002291 germanium compounds Chemical class 0.000 description 2
- 150000002430 hydrocarbons Chemical group 0.000 description 2
- WVDDGKGOMKODPV-UHFFFAOYSA-N hydroxymethyl benzene Natural products OCC1=CC=CC=C1 WVDDGKGOMKODPV-UHFFFAOYSA-N 0.000 description 2
- 235000019388 lanolin Nutrition 0.000 description 2
- 239000011133 lead Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- JYVLIDXNZAXMDK-UHFFFAOYSA-N pentan-2-ol Chemical compound CCCC(C)O JYVLIDXNZAXMDK-UHFFFAOYSA-N 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 150000003254 radicals Chemical class 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- 150000005846 sugar alcohols Polymers 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical group ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- HLZKNKRTKFSKGZ-UHFFFAOYSA-N tetradecan-1-ol Chemical compound CCCCCCCCCCCCCCO HLZKNKRTKFSKGZ-UHFFFAOYSA-N 0.000 description 2
- FDNSKZMGQQDYQB-UHFFFAOYSA-N tetradodecylstannane Chemical compound CCCCCCCCCCCC[Sn](CCCCCCCCCCCC)(CCCCCCCCCCCC)CCCCCCCCCCCC FDNSKZMGQQDYQB-UHFFFAOYSA-N 0.000 description 2
- XJPKDRJZNZMJQM-UHFFFAOYSA-N tetrakis(prop-2-enyl)stannane Chemical compound C=CC[Sn](CC=C)(CC=C)CC=C XJPKDRJZNZMJQM-UHFFFAOYSA-N 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 2
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 2
- RDYAMHIAJLBLIF-HNQUOIGGSA-N (e)-hex-2-ene-1,6-diol Chemical compound OCCC\C=C\CO RDYAMHIAJLBLIF-HNQUOIGGSA-N 0.000 description 1
- ZORQXIQZAOLNGE-UHFFFAOYSA-N 1,1-difluorocyclohexane Chemical compound FC1(F)CCCCC1 ZORQXIQZAOLNGE-UHFFFAOYSA-N 0.000 description 1
- BNQRPCHLJOKCFP-UHFFFAOYSA-N 1-methylpent-2-ene-1,2,3-tricarboxylic acid Chemical compound CC(C(=C(CC)C(=O)O)C(=O)O)C(=O)O BNQRPCHLJOKCFP-UHFFFAOYSA-N 0.000 description 1
- WCASXYBKJHWFMY-NSCUHMNNSA-N 2-Buten-1-ol Chemical compound C\C=C\CO WCASXYBKJHWFMY-NSCUHMNNSA-N 0.000 description 1
- WRMNZCZEMHIOCP-UHFFFAOYSA-N 2-Phenylethanol Natural products OCCC1=CC=CC=C1 WRMNZCZEMHIOCP-UHFFFAOYSA-N 0.000 description 1
- KRZTYSCUOUIFHR-BDAKNGLRSA-N 2-[(1r,3s)-2,2-dimethyl-3-(2-oxopropyl)cyclopropyl]acetonitrile Chemical compound CC(=O)C[C@H]1[C@@H](CC#N)C1(C)C KRZTYSCUOUIFHR-BDAKNGLRSA-N 0.000 description 1
- DXSPYOULGLPECX-UHFFFAOYSA-N 2-ethyl-2-propylpentanoic acid Chemical compound CCCC(CC)(C(O)=O)CCC DXSPYOULGLPECX-UHFFFAOYSA-N 0.000 description 1
- TXCZGPMKLXFVRK-UHFFFAOYSA-N 2-ethyl-4-propylheptan-1-ol Chemical compound C(C)C(CO)CC(CCC)CCC TXCZGPMKLXFVRK-UHFFFAOYSA-N 0.000 description 1
- IWTBVKIGCDZRPL-LURJTMIESA-N 3-Methylbutanol Natural products CC[C@H](C)CCO IWTBVKIGCDZRPL-LURJTMIESA-N 0.000 description 1
- PDVIWMXUECDDHL-UHFFFAOYSA-N 3-cyclopenta-2,4-dien-1-ylpropanoic acid Chemical compound OC(=O)CCC1C=CC=C1 PDVIWMXUECDDHL-UHFFFAOYSA-N 0.000 description 1
- YYPNJNDODFVZLE-UHFFFAOYSA-N 3-methylbut-2-enoic acid Chemical compound CC(C)=CC(O)=O YYPNJNDODFVZLE-UHFFFAOYSA-N 0.000 description 1
- UIERETOOQGIECD-UHFFFAOYSA-N Angelic acid Natural products CC=C(C)C(O)=O UIERETOOQGIECD-UHFFFAOYSA-N 0.000 description 1
- RWPICVVBGZBXNA-BGYRXZFFSA-N Bis(2-ethylhexyl) terephthalate Natural products CCCC[C@H](CC)COC(=O)C1=CC=C(C(=O)OC[C@H](CC)CCCC)C=C1 RWPICVVBGZBXNA-BGYRXZFFSA-N 0.000 description 1
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 1
- LGOVZWNMPCFISV-UHFFFAOYSA-N C(CCCCCCCCCCCCC)[Sn] Chemical compound C(CCCCCCCCCCCCC)[Sn] LGOVZWNMPCFISV-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 235000011779 Menyanthes trifoliata Nutrition 0.000 description 1
- 240000008821 Menyanthes trifoliata Species 0.000 description 1
- ZJVKLBBPLUXEAC-UHFFFAOYSA-N Pipethanate hydrochloride Chemical compound [Cl-].C=1C=CC=CC=1C(C=1C=CC=CC=1)(O)C(=O)OCC[NH+]1CCCCC1 ZJVKLBBPLUXEAC-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- BCKXLBQYZLBQEK-KVVVOXFISA-M Sodium oleate Chemical compound [Na+].CCCCCCCC\C=C/CCCCCCCC([O-])=O BCKXLBQYZLBQEK-KVVVOXFISA-M 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- WNLRTRBMVRJNCN-UHFFFAOYSA-L adipate(2-) Chemical compound [O-]C(=O)CCCCC([O-])=O WNLRTRBMVRJNCN-UHFFFAOYSA-L 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- CEGOLXSVJUTHNZ-UHFFFAOYSA-K aluminium tristearate Chemical compound [Al+3].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CEGOLXSVJUTHNZ-UHFFFAOYSA-K 0.000 description 1
- AVKUERGKIZMTKX-NJBDSQKTSA-N ampicillin Chemical compound C1([C@@H](N)C(=O)N[C@H]2[C@H]3SC([C@@H](N3C2=O)C(O)=O)(C)C)=CC=CC=C1 AVKUERGKIZMTKX-NJBDSQKTSA-N 0.000 description 1
- UIERETOOQGIECD-ARJAWSKDSA-N angelic acid Chemical compound C\C=C(\C)C(O)=O UIERETOOQGIECD-ARJAWSKDSA-N 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- BHDOPTZJCSDVJE-CVBJKYQLSA-L barium(2+);(z)-octadec-9-enoate Chemical compound [Ba+2].CCCCCCCC\C=C/CCCCCCCC([O-])=O.CCCCCCCC\C=C/CCCCCCCC([O-])=O BHDOPTZJCSDVJE-CVBJKYQLSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019445 benzyl alcohol Nutrition 0.000 description 1
- RWPICVVBGZBXNA-UHFFFAOYSA-N bis(2-ethylhexyl) benzene-1,4-dicarboxylate Chemical compound CCCCC(CC)COC(=O)C1=CC=C(C(=O)OCC(CC)CCCC)C=C1 RWPICVVBGZBXNA-UHFFFAOYSA-N 0.000 description 1
- FKGGYEJRRYICKM-UHFFFAOYSA-N bis(5-ethylnonan-2-yl) pentanedioate Chemical compound CCCCC(CC)CCC(C)OC(=O)CCCC(=O)OC(C)CCC(CC)CCCC FKGGYEJRRYICKM-UHFFFAOYSA-N 0.000 description 1
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- PXEZJFCHOOBNJU-UHFFFAOYSA-N tetracyclohexylgermane Chemical compound C1CCCCC1[Ge](C1CCCCC1)(C1CCCCC1)C1CCCCC1 PXEZJFCHOOBNJU-UHFFFAOYSA-N 0.000 description 1
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- CRHIAMBJMSSNNM-UHFFFAOYSA-N tetraphenylstannane Chemical compound C1=CC=CC=C1[Sn](C=1C=CC=CC=1)(C=1C=CC=CC=1)C1=CC=CC=C1 CRHIAMBJMSSNNM-UHFFFAOYSA-N 0.000 description 1
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- GAZOLHOKOWLYFM-UHFFFAOYSA-N trichloro(trichlorogermylmethyl)germane Chemical compound Cl[Ge](Cl)(Cl)C[Ge](Cl)(Cl)Cl GAZOLHOKOWLYFM-UHFFFAOYSA-N 0.000 description 1
- ZWLAZSNDQWIQLN-UHFFFAOYSA-N triethyl(fluoro)germane Chemical compound CC[Ge](F)(CC)CC ZWLAZSNDQWIQLN-UHFFFAOYSA-N 0.000 description 1
- YMSWJBZPRYKQHJ-UHFFFAOYSA-N triethylgermanium Chemical compound CC[Ge](CC)CC YMSWJBZPRYKQHJ-UHFFFAOYSA-N 0.000 description 1
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- XGRPNCOKLIMKBN-UHFFFAOYSA-M trimethylstannanylium;iodide Chemical compound C[Sn](C)(C)I XGRPNCOKLIMKBN-UHFFFAOYSA-M 0.000 description 1
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Classifications
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- C10M1/00—Liquid compositions essentially based on mineral lubricating oils or fatty oils; Their use as lubricants
- C10M1/08—Liquid compositions essentially based on mineral lubricating oils or fatty oils; Their use as lubricants with additives
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- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/22—Tin compounds
- C07F7/226—Compounds with one or more Sn-S linkages
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- C10M2201/02—Water
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- C10M2201/087—Boron oxides, acids or salts
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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- 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
- C10M2229/05—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon
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- 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
- C10M2229/05—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon
- C10M2229/051—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon containing halogen
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- C10N2010/00—Metal present as such or in compounds
- C10N2010/08—Groups 4 or 14
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- 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
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- 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
- C10N2030/32—Light or X-ray resistance
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- C10N2040/14—Electric or magnetic purposes
- C10N2040/16—Dielectric; Insulating oil or insulators
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- C10N2040/14—Electric or magnetic purposes
- C10N2040/17—Electric or magnetic purposes for electric contacts
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- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/20—Metal working
- C10N2040/22—Metal working with essential removal of material, e.g. cutting, grinding or drilling
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- 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
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- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2060/00—Chemical after-treatment of the constituents of the lubricating composition
- C10N2060/04—Oxidation, e.g. ozonisation
Definitions
- This invention relates to novel lubricant compositions and a method for their use in lubricating rubbing surfaces. More particularly, the invention is concerned with the use of organo-metallic additives of tin and germanium to enhance the lubricating properties of polyester oils and greases.
- a typical example of such an E.P. additive is carbon tetrachloride which breaks down in a lubrication system to form degradation products that react with the iron oxide coating on a ferrous rubbing member to form a film of ferrous chloride which acts to lubricate the rubbing metal surfaces. Since the lubrication mechanism of El. additives involves corrosion of the rubbing members, these additives have no lubricating effect in rubbing systems in which the rubbing members have relatively non-reactive surfaces which resist corrosion by the additive. Typical examples of such non-reactive rubbing systems are titanium-on-titanium, stainless steel-on-stainless steel, and gold-on-gold.
- the non-reactivity of the rubbing surfaces may be due to the resistance to corrosion of the material forming the rubbing members as is the case of gold rubbing on gold wherein the gold is essentially inert to any chemical reaction. Further, it may be due to the nonreactivity of an oxide film which is present on the surfaces of the rubbing members as in the case of a titanium-ontitanium rubbing system since titanium readily forms a surface oxide coating which is extremely nonreactive.
- An example of a non-metallic rubbing system. in which the rubbing members are non-responsive to ER additives is nylon rubbing on nylon, since the nylon is substantially chemically inert.
- Other plastics which cannot be lubricated by E.P. lubricant additives are the polymethyl methacrylates, polyvinyl chloride and polyethylene.
- polyester lubricants both greases and oils
- a more particular object of this invention is to provide polyester lubricant compositions which are efiicacious in lubricating rubbing systems operating under severe conditions in which the rubbing surfaces are non-corrodable by conventional E.P. additives.
- Another and more particular object is the provision of a method for utilizing improved polyester lubricants in lubricating rubbing surfaces under extreme pressure conditions. Additional objects of the invention will become apparent from the description and claims which follow.
- the lubricity of polyester base lubricants may be greatly enhanced by adding thereto an organometallic compound of tin or germanium in a-quantity sufiicient to increase the lubricity of the polyester base lubricant.
- the invention is not limited to any particular mechanism of anti-wear action, it is believed that a film is formed on the rubbing surfaces, said film being formed substantially entirely from the degradation of the organometallic tin or germanium additive under the influence of heat and pressure generated at the contact points of the rubbing surfaces.
- the film is formed independently of any corrosive mechanism as required in the case of conventional E.'P. additives and, accordingly, the film is effective in lubricating surfaces which are essentially nonreactive and have a high resistance to corrosion.
- the organometallic tin or germanium additive can be present in the polyester lubricant in various concentrations and in various forms of dispersion.
- the organometallic additive may be present in the form of well-dispersed, finely-divided particles, whereas in the case of a polyester oil, it is preferable that the organometallic additive be soluble in the oil so as to form a solution.
- the higher the concentration of the organometallic tin or germanium additive in the polyester lubricant the greater is the lubricating power of the product obtained.
- the preferred composition range of the invention ranges from 0.1 to 10 percent by weight of the organotin or organogermanium additive in the polyester base lubricant.
- the organotin and organogermanium compounds utilized in this invention may be characterized as compounds in which there are monovalent carbon-to-metal bonds in the molecule. To be effective, these compounds must be relatively soluble in the polyester base material so as to form lubricant compositions which are stable and remain constant over extended periods of time during shipment and storage.
- the metal aryls such as, for example tetraphenyl tin, have not proved suitable in formulating the lubricant compositions of the invention due to the fact that they are soluble only to a very limited degree in the polyester base material.
- the organotin and organogermanium compounds utilized in the invention may be metal alkyls such as tetraethyl tin, dimethyldiethyl germanium, tetraeicosyl germanium, tetra-n-butyl tin and tetradecyl tin and the alicyclic-substituted metal compounds, such as tetracyclohexyl germanium and bis(2 ethylcyclopentyl) dicyclohexyl tin.
- the organometallic radical bonded to the metal may be unsaturated as for example, in the case of tetra(2- propenyl) tin, tetra( 1,3-butadienyl) germanium, bis(cyclohexadienyl) bis(cyclopentadienyl) tin and the like. Further included are compounds in which the metal atom is bonded to mixed hydrocarbon groups such as dicyclohexyl-dimethyl germanium, dicyclopentadienyl-diethyl tin,
- organometallic compounds used in formulating the lubricants of the invention may be halogen-substituted, may contain sulfur in the molecule and may contain various functional groups such as the carbonyl, hydroxyl and carboxyl groups. Further, the organometallic compound may contain metal-to-metal bonds as, for example, in the case of hexaethyl-digermane.
- Typical examples of such compound are trimethyl germanium fluoride, triethylgermanium fluoride, trimethyltin iodide, dimethylgermanium dichloride, methylene-bis(trichlorogermane), di-n-propylgermanium oxide, bis(triethylgermyl) amine, di-n-butyltin sulfide, triethyltin hydroxide, bis(triethyltir1) acetylene and diethylgermanium imine.
- organometallic tin or germanium compounds Since the solubility of the organometallic tin or germanium compounds in diester oils and greases generally decreases as the number of carbon atoms per molecule is increased, a preferred class of organometallic compounds for use as diester additives is represented by the non-aromatic organometallic compounds of tin and germanium wherein each molecule contains from 2 to 36 carbon atoms. It has been found that the compounds within this range are soluble in diester oils to the extent required to form an effective lubricant film on the surface of the rubbing members during use of the lubricant.
- the concentration of the organometallic compound is uniform throughout the lubricant and forms a stable composition which remains constant over extended periods of time during shipment and storage.
- Compounds having branched chain hydrocarbon constituent groups are generally more unstable than are their straight chain counterparts and thus, straight chain substitution is generally found to produce a better diester lubricant additive.
- the polyester lubricant base materials used in formulating the lubricant compositions of my invention may be either oils or greases.
- the oils may be formed by the reaction of a polycarboxylic acid with a mono-hydric alcohol, the reaction of a polyhydric alcohol with a monocarboxylic acid, reaction between a polyhydric alcohol and a polycarboxylic acid, or combinations of the above reactions, such as, for example, reaction of a dicarboxylic acid with a glycol and a mono-hydric alcohol, reaction of a glycol with a dicarboxylic acid and a mono-carboxylic acid, or the reaction of a glycol, a mono-hydric alcohol, a dicarboxylic acid and a mono-carboxylic acid.
- the acids may be mono-carboxylic aliphatic acids such as, for example, propionic acid, valeric acid, Z-ethyl enanthic acid, 2,2-di-propyl butyric acid or 3-(2-methylhexyl) valeric acid.
- They may contain unsaturated linkages, such as, for example, in senecioic acid, sorbic acid, or angelic acid; they may be polycarboxylic aliphatic acids such as succinic acid, glutaric acid, azelaic acid, S-octene- 1,8-dicarboxylic acid, or 3-hexene-2,3,4-tricarboxylic acid, and they may be aromatic or cycloaliphatic acids, such as cyclohexaneacetic acid, 1,4-cyclopentylenebis acetic acid, phthalic acid, hemimellitic acid, and terephthalic acid.
- unsaturated linkages such as, for example, in senecioic acid, sorbic acid, or angelic acid
- they may be polycarboxylic aliphatic acids such as succinic acid, glutaric acid, azelaic acid, S-octene- 1,8-dicarboxylic acid, or 3-hexene
- the alcohols used in preparing the polyester lubricant base materials may be aliphatic mono-hydric alcohols such as propanol, 2-ethy1-3-hexenol, 2-ethyl-4-propyl heptanol, 2-butenol, or Z-methyl propanol. They may be polyhydric aliphatic alcohols, such as, 1,6-hexamethylene glycol, 1,l-decamethylene glycol, 2-hexene-1,6-diol, and
- 1,6-heptylene glycol may be mono or polyhydric alicyclic or aromatic alcohols, such as 4-[m-(2-hydroxyethyl) phenyl] butanol, 3-(2-hydroxyethyl) cyclohexanebutanol, p-(hydroxymethyl) phenethyl alcohol, a-methylp.xylene-a,a-diol, 1,4 cyclohexane-B,[3'-diethyl-dimethanol, 2,3-bis(4-hydroxybutyl) benzyl alcohol, 4,4'-[3-(3- hydroxyhexyl)-o-phenylene] dibutanol, and 5-[3-(3-hydroxypropyl) cyclopenta-2,4-dienylene] 3-ethyl amyl alcohol.
- the polyester base greases used in formulating lubricant compositions of the invention are formed by admixing a soap with a diester oil.
- soaps may be derived from animal or vegetable fats or fatty acids, wool grease; rosin, or petroleum acids. Typical examples of such soaps are lead oleate, lithium stearate, aluminum tristearate, calcium glycerides, sodium oleate and the like.
- the diester greases may contain unreacted fat, fatty acids, and alkali; unsaponifiable matter including glycerol and fatty alcohols; rosin or wool grease; water; and certain additives which may function as modifiers or peptizers.
- the lubricant compositions of my invention include the addition of an organometallic compound of tin or germanium, as described hereinbefore, to any known polyester lubricant material. More specifically, however, I have found that lubricant compositions comprising an organometallic compound of tin or germanium admixed with a diester, as set forth in the following generic formula, provide superior lubricant compositions and it is these lubricant compositions which are particularly preferred within the scope of my invention.
- the diester lubricant materials used in formulating the preferred lubricant compositions have the following generic formula:
- R is divalent aliphatic hydrocarbon radical which may be saturated or unsaturated and has from 2 to 8 carbon atoms and R and R are branched chain alkyl groups having at least 4 carbon atoms.
- the diesters utilized in formulating the preferred lubricant compositions including esters of succinic, glutaric, adipic, pimelic, suberic, azelaic and sebacic acid.
- esters include diisooctyl azelate, di(2-ethylhexyl) sebacate, di-sec-amyl sebacate, diisooctyl adipate, di(2- ethylhexyl) adipate, di(2-ethylhexyl) azelate, di(l-methyl- 4-ethyloctyl) glutarate, di-isoamyl adipate, di(2-ethylhexyl) glutarate, di(2-ethylbutyl) adipate, di-tetradecyl sebacate and di(2-ethylhexyl) pinate.
- the preferred diesters are prepared by esterifying one mole of a dicarboxylic acid having the general formula: HOOC(CH COOH, where x is an integer of from 2 to 8, with 2 moles of a branched chain alcohol containing at least 4 carbon atoms.
- Typical of the reactions embraced herein are the reactions of succinic, glutaric, adipic, pimelic, suberic or azelaic acid with sec-amyl alcohol, 3-methyl butanol, 2 ethyl hexanol or the branched chain secondary alcohols undecanol or tetradecanol.
- the preferred diester lubricant fluids have molecular weights ranging from about 300 to about 600 and freezing and pouring points from about -40 to less than about F.
- the flash and fire points range from about 300 F. to about 500 F. and their spontaneous ignition temperatures range from about 100 to about 800 F.
- the diesters made by reacting a dicarboxylic acid with a branched chain alcohol have been found to have supen'or viscometric properties as compared with diesters made by reacting dihydric alcohols with monocarboxylic acids, and thus, diesters prepared by the former method are preferred in formulating the lubricant compositions of my invention.
- polyester grease compositions within the scope of my invention I have found that the greases prepared by admixing a lithium soap with the polyester oils have superior oxidative stability as compared with greases formulated with other soaps, such as, for example, the sodium, calcium or lead soaps.
- the polyester greases employing a lithium soap constitute a preferred embodiment of lubricant compositions within the scope of my invention.
- Example I One part of tetramethyltin is blended with 99 parts of diisooctyl adipate having a viscosity of 35.4 SUS -at 210 F., a viscosity of 57.3 SUS at 100 F, a Viscosity of 3,980 SUS at -40 F. and a viscosity of 22,500 at 65 F. Its viscosity index is 143, its ASTM pour point is below 80 F. and its specific gravity (60 F./ 60 F.) is 0.926.
- Example II Five parts of di-n-propylgermanium oxide are blended with di(1-metl1yl-4-ethyloctyl) glutarate.
- Di(1-methy1-4- ethyloctyl) glutarate has a freezing point of -80 F, a specific gravity, (1 of 0.901, a kinematic viscosity of 3.45 centistokes at 210 F., 15.9 centistokes at 100 F., 485 centistokes at F. and 7,430 centistokes at 40 F.
- Example 111 Eight parts of tetraeicosylgarmanium are blended with 92 parts of grease comprising 12 percent of lithium stearate, 1 percent of polybutene (12,000 molecular weight), 0.2 percent of 4-tert-butyl-2-phenyl phenol, 2 percent of calcium xylyl stearate, 33.8 percent of di(2-ethylhexyl) sebacate and 51 percent of di(2-ethylhexyl) adipate.
- grease comprising 12 percent of lithium stearate, 1 percent of polybutene (12,000 molecular weight), 0.2 percent of 4-tert-butyl-2-phenyl phenol, 2 percent of calcium xylyl stearate, 33.8 percent of di(2-ethylhexyl) sebacate and 51 percent of di(2-ethylhexyl) adipate.
- Example IV To 99.9 parts of diethylphthalate is added 0.1 part of tetradodecyltin. Diethylphthalate has a freezing point of 27 F. and a specific gravity, d of 1.114. Its viscosity at 210 F. is 1.73 centistokes, at 100 F. is 6.26 centistokes and at 0 F. is 121 centistokes.
- Lubricant compositions similar to that of Example IV are prepared by adding 0.1 part of tetradodecyltin to 99.9 parts of one of the following diester fluids: bis(2-ethyl hexyl) terephthalate, 2-butylhexyl 3-(2-butylhexyloxycarbonyl) 2,4 cyclopentadienepropionate, tris(2-ethylpentyl)trimesate, 2,1l-diethyldodecamethylene 1,4-cyclohexane-diacetate, 2,l4-dipropylpentadecamethylene terephthalate, 1,3-cyclopentylenebis(3 ethylhexamethylene) terephthalate, and 2,16-diethylheptadecamethylene pimelate.
- diester fluids bis(2-ethyl hexyl) terephthalate, 2-butylhexyl 3-(2-butylhexyl
- Example V Five parts of tetraethylgermanium are blended with 95 parts of diisooctyl azelate having a kinematic viscosity of 3.34 centistokes at 210 F., 7000 centistokes at 65 F. (ASTM 445-52T), an ASTM slope from 40 to 210 F. of 0.693 (ASTM D341-43) and a pour point of 85 F. (ASTM D97-47). Its flash point is 425 F. (ASTM D92-52), and is specific gravity is 0.9123 at 25 C.
- Example VI To 97 parts of diisoamyl adipate is added 3 parts of dimethyltin sulfide.
- Diisoamyl adipate has a viscosity of 1.71 centistokes at 210 F., 4.93 centistokes at 100 F., 180 centistokes at 40 F. and 840 centistokes at 65 F. Its viscosity index is 125, its ASTM pour point is below 80 F. and its specific gravity (60 F./ 60 F.) is 0.938.
- Di-secamyl sebacate has a viscosity of 34.2 Saybolt Universal seconds (SUS) at 210 F., a viscosity of 51.7 SUS at 100 F., a viscosity of 2,660 SUS at 40 F. and a viscosity of 15,100 SUS at 65 F. Its viscosity index is 130, its pour point is below F. and its specific gravity (60 F./60 F.) is 0.915.
- SUS Saybolt Universal seconds
- Example VIII Three parts of di-n-butyltin sulfide are blended and mixed with 97 parts of a grease comprising 12.5 percent of lithium stearate, 1 part of polybutene (12,000 molecular weight), 0.2 percent of 4-tert-butyl-2-phenyl phenol, 2 percent of calcium xylyl stearate and 84.3 percent of di(2-ethylhexyl) sebacate.
- Example X lFour parts of bis-triethylgermanium sulfide are blended with 96 parts of di(2-ethylhexyl) sebacate having a viscosity of 37.4 SUS at 210 F., 68.9 SUS at 100 F., 6,410 SUS at 40 F. and 35,800 SUS at 65 F. Its viscosity index is 154, its ASTM pour point is below 80 F. and its specific gravity (60 F./60 F.) is 0.912.
- Example XI To 99 parts of di(2-ethylbutyl) adipate is added l'part of triethylgennanium bromide.
- Di(2-ethylbuty1) adipate has a freezing point of 15 F., a specific gravity, d of 0.934, a viscosity of 1.89 centistokes at 210 F., a viscosity of 5.68 centistokes at 100 F., a viscosity of 51 centistokes at 0 F. and a kinematic viscosity index of 123.
- Example XII Ten parts of bis(triethylgermanium) amine are mixed with parts of a grease comprising 11 percent of lithium stearate, 0.4 percent of 4-tert-butyl-2-phenyl phenol, 1 percentof polybutene 12,000 molecular weight), 1 percent of sorbitan monooleate and 86.6 percent of di [1-(2- methylpropyl)-4-ethyloctyl] sebacate.
- Example XIII Seven parts of di-n-butyltin dilaurate are blended with 93 parts of 1,6-hexamethylene glycol di(2-ethylhexanoate).
- 1,6-hexamethylene glycol di(2-ethylhexanoate) has a specific gravity, d of 0.908, a viscosity of 2.35 centistokes at 210 F., a viscosity of 8.64 centistokes at F., a viscosity of 129 centistokes at 0 F. and a viscosity of 1,090 centistokes at 40 F.
- Its kinematic viscosity index is 96 and its ASTM slope from -40 F. to 210 F. is 0.79.
- Example XIV Two parts of dicyclohexyl-diethyl tin are blended with 98 parts of di(2-ethylhexyl) azelate having a kinematic viscosity of 2.96 centistokes at 210 F., 11 centistokes at 100 F., 1,150 centistokes at '40 F., and 6,400 centistokes at -65 F. as measured by the test set forth in ASTM 445-42T. Its ASTM slope from 40 F. to 210 F. is 0.724 (ASTM D34l-43), its pour point is l00 F. (ASTM D97-47), its flash point is 420 F. (ASTM D92-52) and its specific gravity, as measured at 25 C., is 0.9124.
- Example XV Four parts of tetra-allyltin are blended and mixed with 96 parts of a grease comprising 12 percent of lithium stearate, 2.5 percent of polybutene (12,000 molecular weight), 0.2 percent of 4-tert-butyl-2-phenyl phenol and 85.3 percent of di(2-ethylhexyl) adipate.
- Example XVI Six parts of hexaethyl digermane are blended and mixed with 94 parts of a grease consisting of 12 percent of lithium stearate and 88 percent of di(2ethylhexyl) sebacate.
- lubricant compositions similar to the lubricant of Example XVI are prepared by mixing 6 parts of hexaethyl digermane with grease compositions comprising 88 percent of di(2-ethylhexyl) sebacate admixed respectively with calcium stearate, lead naphthenate, barium oleate, strontium stear ate and magnesium stearate.
- lubricant compositions containing a polyester oil or grease and an organometallic compound as defined above were tested in a four-ball wear machine to determine the lubricity of the respective lubricant compositions relative to operation with non-additive polyester oils or greases.
- the four-ball wear machine is described by Larsen and Perry in the Transactions of the A.S.M.E., January 1945, pp. 45-50.
- the four-ball wear machine utilizes four balls of equal size arranged in a tetrahedral formation.
- the bottom three balls are held in a non-rotatable fixture which is essentially a universal chuck that holds the balls in abutting relation to each other. Since the bottom three balls are of equal size, their centers form the apices of an equilateral triangle.
- the top ball is afiixed to a rotatable spindle whose axis is positioned perpendicularly to the plane of the ball holder and in line with the center point of the triangle whose apices are the centers of the three bottom stationary balls.
- the four balls are immersed in the lubricant composition to be tested and the fixture holding the three bottom balls is moved upwardly so as to bring the three fixed lower balls into engagement with the upper rotating ball.
- the fixture is moved upwardly and axially of the rotating spindle aflixed to the upper ball.
- the lubricity of the lubricant under test is determined by the amount of wear occurring on the lower balls at the points of contact with the upper rotating ball. If the lubricant is completely effective, the amount of wear will be negligible. On the other hand, if the lubricant is not completely efiective under the test conditions, the upper ball may weld or seize to the lower balls due to the heat of friction at the contact points, or the wear which occurs will be excessive. If seizure does not occur, the average diameter of the circular scar areas of the lower balls is measured so as to give a quantitative basis for comparing the test results with those of other tests. As the severity of the test conditions is increased with a given lubricant composition, the likelihood of excessive wear of the lower balls is increased.
- Example XVII Non-additive-containing di(2-ethylhexyl) sebacate was run in the four-ball wear machine under the following test conditions: the speed of rotation of the upper ball was 572 r.p.m., the test temperature was 50 C., and the balls were /2 inch in diameter and constructed of SAE 52-100 steel. The machine was run for two hours under the above conditions at a loading of l kilogram, after which the balls were disassembled and the average scar diameter on the lower three balls was measured and found to be 0.15 millimeter.
- Example XVIII Non-additive-containing d i(2-et hylhexyl) sebacate was run in the four-ball wear machine for two hours at a loading of 2.5 kilograms under the test conditions utilized in Example XVII. The average scar diameter on the lower three balls was 0.30millimeter.
- Example XIX Non-additive-containing di(2-ethylhexyl) sebacate was run in the four-ball wear machine under the test condi' tions utilized in Examples XVII and XVIII for a period of two hours at a loading of 10 kilograms. The average scar diameter on the lower three balls was 0.53 millimeter.
- Example XX A lubricant composition comprising 5 parts by weight of di-n-butyltin sulfide admixed with parts of di(2- ethylhexyl) sebacate was run in the four-ball wear machine under the identical test conditions utilized in Example XVII, namely, a two hour run at a 1 kilogram loading. The average scar diameter on the lower three balls was measured and found to be 0.11 millimeter.
- Example XXI The lubricant composition used in Example XX was run in the four-ball wear machine under the identical test conditions utilized in Example XVIII. The average scar diameter on the lower three balls was 0.14 millimeter.
- Example XXII The lubricant composition utilized in Example XX was run in the four-ball wear machine under the identical test conditions utilized in Example XIX, namely, a two hour run at a 10 kilogram loading. The average scar diameter on the lower three balls was 0.26 millimeter.
- Example XXIII Two lubricant compositions, one being di(2-ethylhexyl) glutarate and the other being the lubricant composition of Example VIII are tested in the four-ball wear machine under the following conditions:
- the lubricant composition of the invention namely the composition of Example VIII is far superior to the non-additive'containing diisooctyl azelate.
- Example XXIV 9 for identical times, the lubricant composition of the invention, namely that set forth in Example XII, will prove far superior to the non-organometallic-containing polyester grease composition.
- Example XXV When tested in the four-ball wear machine under the conditions of Examples XXIII and XXIV, a lubricant composition of the invention comprising parts of tetraethyl germanium blended with 95 parts of diisooctyl azelate provides superior lubrication as compared with the lubrication provided by non-additive-containing diisooctyl azelate.
- Example XXVI A non-additive-containing diester lubricant comprising solely diisoamyl adipate was run in the four-ball wear machine under the following test conditions: the speed of rotation of the upper ball was 572 r.p.m., the testing temperature was 50 C., and the balls were /2 inch in diameter and constructed of SAE 52l00 steel. Following a two hour run at a load of 20 kilograms, the balls were disassembled and the average scar diameter on the lower three balls was 0.95 millimeter.
- Example XXVII A lubricant composition comprising parts by weight of di-n-butyltin dilaurate admixed with 90 parts of diisoamyl adipate was run in the four ball wear machine for two hours at a loading of 20 kilograms under the same test conditions utilized in Example XXVI. The average scar diameter on the lower three balls was measured and found to be 0.72 millimeter.
- Example XX VIII Non-additive-containing di-tridecyl azelate was tested in the four-ball wear machine under the same general conditions utilized in Examples XXVI and XXVII. The loading applied was 40 kilograms for a period of two hours after which the balls were disassembled and the average scar diameter on the lower three balls was measured and found to be 0.62 millimeter.
- Example XXIX A lubricant composition comprising 5 parts by Weight of di-n-butyltin sulfide admixed with 95 parts of di-tridecyl azelate was tested under the identical conditions utilized in Example XXVIII, namely, a 40 kilogram loading applied for 2 hours. The average scar diameter on the lower three balls was 0.39 millimeter.
- Example XXIII through XXIX clearly demonstrate superiority of my lubricant compositions as compared with non-additive-containing diester lubricant materials.
- the scar diameter obtained in Example XXVII was reduced to approximately 76 percent of the scar diameter obtained in Example XXVI, utilizing the same base diester material under identical test conditions.
- the scar diameter obtained in Example XXIX is approximately 63 percent of that obtained in Example XXVIII utilizing the same base diester lubricant material under identical test conditions. This is an even more striking improvement than is afforded by the com arisen between Examples XXVI and XXVII.
- Examples XXIII through XXIX illustrate the effectiveness of my lubricant compositions over a wide range of organotin and organogermanium compounds admixed with a wide range of diester lubricant materials at loads up to 40 kilograms, so' as to obtain effective lubrication in a manner heretofore unknown in the lubrication art.
- Example XXX A non additive lubricant composition comprising 50 parts by weight of di(Z-ethylhexyl) sebacate, blended with 50 parts of diisoamyl adipate was tested in the four-ball wear machine under the following conditions: the speed of rotation of the upper ball was 572 r.p.m., the test temperature was 50 C., the three stationary bottom balls were /2 inch in diameter and constructed of brass, and the upper ball was /2 inch in diameter and constructed of SAE 52-100 steel. The lubricant was tested for one hour under the above conditions at a 10 kilogram loading, whereupon the balls were disassembled and the average scar diameter on the bottom three brass balls was found to be 0.85 millimeter.
- Example XXXI A lubricant composition comprising 7 parts by weight of tri-n-butyltin chloride admixed with parts of the diester lubricant utilized in Example XXX, was tested in the four-ball wear machine under the identical conditions utilized in Example XXX. Following the test, which comprised a 10 kilogram loading for a period of one hour, the average scar diameter on the stationary brass balls was found to be 0.55 millimeter.
- Example XXXII Non-additive-containing di(2-ethylhexyl) sebacate was tested in the four-ball wear machine under the following conditions: the speed of rotation of the upper ball was 79 r.p.m., the test temperature was 50 C., the balls were /2 inch in diameter, constructed of hard steel and having a 0.001 inch thickness of gold plating thereon. Two runs were conducted under a 0.5 loading at the above conditions. Seizure occurred at the end of 18 minutes in the first run and after 11 /2 minutes in the second run, and was manifested in each case by rapid extensive tearing of the gold plate on the balls and the formation of large particles of debris.
- Example XXXIII A lubricant composition comprising 5 parts by weight of di-n-butyltin sulfide admixed with parts of di(2- ethylhexyl) sebacate was tested in the four-ball wear machine under the identical conditions used in Example XXXIII. Effective lubrication was achieved for a period of two hours at the 0.5 kilogram loading.
- Examples XXX through XXXIII further demonstrate the increased lubricating effectiveness of the lubricant compositions of the invention as compared with non-additive-containing diester materials.
- Comparison of the results obtained in Examples XXX and XXXI shows a reduction in scar diameter, achieved through the additive use of 7 parts of tri-n-butyltin chloride, to 64.5 percent of that obtained when utilizing a 5050 non-additive-containing mixture of di(Z-ethylhexyl) sebacate and diisoamyl adipate.
- the results of Examples XXXII and XXIII even more strikingly illustrate the eflf ctiveness of my lubricant compositions.
- Example XXXIII utilizing a composition of the invention, efiective lubrication was obtained for two hours, whereas, with the non-additive-containing lubricant composition of Example XXXII the average time to seizure was 14.7 minutes. In terms of the time of effective lubrication, Example XXXIII represents an increase in lubricating eifectiveness of approximately 8 times that obtained in Example XXXII.
- the lubricity of polyester lubricant compositions are greatly increased by the addition thereto of organometallic compounds of tin or germanium. This enables the utilization of polyester base lubricants in applications heretofore found impossible such as, .for example, utilization under extreme pressure conditions in the lubrication of rubbing surfaces which are relatively inert.
- the lubricating effectiveness of the lubricant compositions of my invention may be greatly increased by proper running-in of the lubricant composition between the rubbing surfaces to be lubricated.
- the running-in comprises subjecting the rubbing surfaces when in contact with the lubricant composition of the invention to a loading that is initially low, being well below the operating load. This load is maintained for a time suflicient to build up a film on the rubbing surfaces that is formed from the degradation of the organometallic additive component in the lubricant. Subsequently the load is increased up to the operating load.
- Variations of this procedure may involve: (l) Gradually increasing the load during the period of film formation; that is to say, the initially low loading is gradually increased at such rate that the build-up of a degradation film on the rubbing surfaces is substantially complete before the operating load is attained and (2) utilizing a constant loading during the period of film formation, which load is not increased until the build-up of a degradation film from the organometallic additive on the rubbing surfaces is substantially complete.
- the lubricating mechanism which takes place when utilizing a lubricant of my invention, is not precisely understood, it is believed that it involves a film formation on the rubbing surfaces due to degradation of the organometallic tin or germanium component in the lubricant. Inasmuch as this film formation requires time and is not an instantaneous phenomenon, the mechanism is not effective when the lubricating surfaces are subjected to an initially high loading, since the loading causes failure before a film can be formed on the rubbing surfaces. The aforementioned method takes cognizance of this fact by allowing suflicient time for build-up of the degradation film on the rubbing surfaces before the application of high loads to the rubbing system. In this manner, the lubricant compositions of my invention are utilized to their full effectiveness so as to enable the utilization of polyester base lubricants in a manner heretofore found impossible.
- Example XXXIV When the lubricant composition set forth in Example VI is run in the four-ball wear machine under the following test conditions in which the speed of rotation of the upper ball is 79 rpm, the ambient temperature is 50 C., the 4 balls are /2 inch in diameter, constructed of 52-100 steel and having a 0.001 inch coating of pure gold, the following results are obtained.
- the lubricant composition is subjected in one test run to an initial loading of kilograms, whereas, in a second test run, the lubricant composition is run for 120 minutes at a load of l kilogram, after which loads of 2.5, 10, and kilograms are applied for 2 /2 minute intervals respectively. When so tested, the lubricant composition is effective in providing lubrication during the second test run at loads above those at which failure occurs in the first test run.
- Example XXXV The lubricant composition of Example XII is tested in the four-ball Wear machine under the conditions of Example XXXIV, and is found effective under the conditions of the second test run at loads in excess of the loading which in the first test run will cause failure.
- Example XXXVI The lubricant composition of Example VIII is tested under the same conditions as in Examples XXXIV and XXXV, and provides effective lubrication when utilized with a running-in period, as in the second test run, at loads in excess of the high initial loads which cause almost instantaneous failure in the first test run.
- Example II comprising 5 parts of di-n-propyl germanium oxide in parts of di(lmethyl-4-ethyloctyl) glutarate
- the lubricant composition of Example I comprising one part of tetramethyltin in 99 parts of diisooctyl adipate
- the lubricant composition of Example I comprising one part of tetra
- polyester lubricant materials would include esters of polycarboxy-substitutedheterocyclic-ring compounds, polyhydric-substituted-heterocyclic-ring compounds and aliphatic polyhydric and polycarboxy compounds containing elements such as sulfur and nitrogen in their structure.
- the polyester base lubricant material may consist of a complex mixture of various esters, such as, for example, a mixture of an azelate with a glycol ester or a diester derived from a polycarboxylic acid other than azelaic acid, or a mixture of a complex polyester with such components as mono-esters or diesters, ether esters, glycols, polyglycols, glycol ethers, formals, polyformals, or blends of two or more of such components, and may include a polysiloxane admixed therewith.
- esters such as, for example, a mixture of an azelate with a glycol ester or a diester derived from a polycarboxylic acid other than azelaic acid
- a mixture of a complex polyester with such components as mono-esters or diesters, ether esters, glycols, polyglycols, glycol ethers, formals, polyformals, or blends of two or
- the lubricant compositions of my invention may also contain other compounds, such as soaps, antioxidants, thickeners, and antifoaming agent additives which are present in commercial polyester lubricants, since such additives in no way inhibit the effectiveness of the lubricant compositions of the invention.
- the lubricant compositions of my invention are not restricted to use with any particular rubbing system, metal or non-metal, since their mechanism of operation is effective in lubricating any combination of rubbing surfaces. Their greatest utility, however, is found in lubricating chemically inactive rubbing surfaces since it is in this area that conventional E.P. additives are ineffective.
- a further utility of the lubricant compositions of the invention is in lubricating electrically conductive noble metal rubbing systems, such as, for example, the silversilver of silver-graphite contacts found in electrical switches, relays, motors and electrical generating equipment.
- the lubricant films laid down by many of the lubricant compositions of the invention have high electrical conductivity and, therefore, would not inhibit the transfer of electrical current between the rubbing members.
- a composition of matter adapted for lubricating rub- /COOR1 R contains from two to eight carbon atoms and is a divalent aliphatic hydrocarbon radical selected from the group consisting of saturated and unsaturated radicals, and R and R are branched chain alkyl groups containing from four to about 14 carbon atoms, said diester having admixed therewith from about 0.1 to about percent of a compound selected from the class consisting of tetraalkyltin compounds and tetraalkylgermanium compounds.
- R contains from two to eight carbon atoms and is a divalent aliphatic hydrocarbon radical selected from the group consisting of saturated and unsaturated radicals and R and R are branched chain alkyl groups containing from four to about 14 carbon atoms, said diester having admixed therewith from about 0:1 to about 10 percent of a compound selected from the class consisting of tetra-alkyltin compounds and tetraalkylgermanium compounds, which method comprises rubbing the surfaces together in the presence of said lubricant at a load which is below the operating load until a film is formed on the rubbing surfaces from the degradation of said compound, and thereafter increasing the load up to the operating load.
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Description
United States Patent Office 3,036,972 Patented May 29, 1962 3,036,972 LUBRICANT COMPOSITION Morton Antler, Detroit, Mich, assignor to Ethyl Corporation, New York, N.Y., a corporation of Delaware No Drawing. Filed Mar. 25, 1958, Ser. No. 723,640 4 Claims. (Cl. 25249.7)
This invention relates to novel lubricant compositions and a method for their use in lubricating rubbing surfaces. More particularly, the invention is concerned with the use of organo-metallic additives of tin and germanium to enhance the lubricating properties of polyester oils and greases.
The lubrication of rubbing systems which operate at extreme pressures presents unusual lubrication problems since the lubricant film between the rubbing surfaces is subjected to high shear forces. Because of these high shear forces, the lubricant films which, under low pressure operating conditions, are present upon the surfaces of the rubbing members, are forced from between the rubbing surfaces so that effective lubrication is not obtained. In order to combat these problems accompanying extreme pressure conditions, it has been the practice of the prior art to utilize lubricant additives which corrode the rubbing surfaces so as to form a film on the surfaces which, in itself, acts as a lubricant. Such additives are spoken of as E.P. additives.
A typical example of such an E.P. additive is carbon tetrachloride which breaks down in a lubrication system to form degradation products that react with the iron oxide coating on a ferrous rubbing member to form a film of ferrous chloride which acts to lubricate the rubbing metal surfaces. Since the lubrication mechanism of El. additives involves corrosion of the rubbing members, these additives have no lubricating effect in rubbing systems in which the rubbing members have relatively non-reactive surfaces which resist corrosion by the additive. Typical examples of such non-reactive rubbing systems are titanium-on-titanium, stainless steel-on-stainless steel, and gold-on-gold. The non-reactivity of the rubbing surfaces may be due to the resistance to corrosion of the material forming the rubbing members as is the case of gold rubbing on gold wherein the gold is essentially inert to any chemical reaction. Further, it may be due to the nonreactivity of an oxide film which is present on the surfaces of the rubbing members as in the case of a titanium-ontitanium rubbing system since titanium readily forms a surface oxide coating which is extremely nonreactive. An example of a non-metallic rubbing system. in which the rubbing members are non-responsive to ER additives is nylon rubbing on nylon, since the nylon is substantially chemically inert. Other plastics which cannot be lubricated by E.P. lubricant additives are the polymethyl methacrylates, polyvinyl chloride and polyethylene.
It is, therefore, a general object of this invention to provide polyester lubricants, both greases and oils, with improved lubricity characteristics. A more particular object of this invention is to provide polyester lubricant compositions which are efiicacious in lubricating rubbing systems operating under severe conditions in which the rubbing surfaces are non-corrodable by conventional E.P. additives. Another and more particular object is the provision of a method for utilizing improved polyester lubricants in lubricating rubbing surfaces under extreme pressure conditions. Additional objects of the invention will become apparent from the description and claims which follow.
In the accomplishment of the above objects, it has been found that the lubricity of polyester base lubricants may be greatly enhanced by adding thereto an organometallic compound of tin or germanium in a-quantity sufiicient to increase the lubricity of the polyester base lubricant. Al-
though the invention is not limited to any particular mechanism of anti-wear action, it is believed that a film is formed on the rubbing surfaces, said film being formed substantially entirely from the degradation of the organometallic tin or germanium additive under the influence of heat and pressure generated at the contact points of the rubbing surfaces. Thus, the film is formed independently of any corrosive mechanism as required in the case of conventional E.'P. additives and, accordingly, the film is effective in lubricating surfaces which are essentially nonreactive and have a high resistance to corrosion.
The organometallic tin or germanium additive can be present in the polyester lubricant in various concentrations and in various forms of dispersion. In the case of a polyester grease, the organometallic additive may be present in the form of well-dispersed, finely-divided particles, whereas in the case of a polyester oil, it is preferable that the organometallic additive be soluble in the oil so as to form a solution. In principle, the higher the concentration of the organometallic tin or germanium additive in the polyester lubricant, the greater is the lubricating power of the product obtained.
Experience has shown, however, that very low concentrations of the order of 0.1 percent by weight of the organotin or organogermaniu-m additives in the polyester lubricant increases its lubricity. In view of the high cost of organotin and organogermanium compounds generally, there is an economic limit to their concentration in the base polyester lubricant, a limit which could be fixed at about 10 percent by weight in the present state of economic conditions. Moreover, when the concentration of the organotin or organoger-manium additives is increased to above 10 percent, the physical properties, for example, viscosity of the resulting composition, may be quite different from those of the polyester base so that the desirable physical properties of the polyester base material may be markedly changed. In fact, with extremely high concentrations of the organotin or organogermanium additive, a situation can be reached in which the polyester lubricant is in effect the additive and the organotin or organogermanium compound is the base fluid, since the physical properties of the resulting composition are more like those of the organometallic component than like the polyester component. Thus, the preferred composition range of the invention ranges from 0.1 to 10 percent by weight of the organotin or organogermanium additive in the polyester base lubricant.
The organotin and organogermanium compounds utilized in this invention may be characterized as compounds in which there are monovalent carbon-to-metal bonds in the molecule. To be effective, these compounds must be relatively soluble in the polyester base material so as to form lubricant compositions which are stable and remain constant over extended periods of time during shipment and storage. The metal aryls such as, for example tetraphenyl tin, have not proved suitable in formulating the lubricant compositions of the invention due to the fact that they are soluble only to a very limited degree in the polyester base material. Thus, the organotin and organogermanium compounds utilized in the invention may be metal alkyls such as tetraethyl tin, dimethyldiethyl germanium, tetraeicosyl germanium, tetra-n-butyl tin and tetradecyl tin and the alicyclic-substituted metal compounds, such as tetracyclohexyl germanium and bis(2 ethylcyclopentyl) dicyclohexyl tin.
The organometallic radical bonded to the metal may be unsaturated as for example, in the case of tetra(2- propenyl) tin, tetra( 1,3-butadienyl) germanium, bis(cyclohexadienyl) bis(cyclopentadienyl) tin and the like. Further included are compounds in which the metal atom is bonded to mixed hydrocarbon groups such as dicyclohexyl-dimethyl germanium, dicyclopentadienyl-diethyl tin,
bis(2,4-cyclohexadienyl) di-n-butyl germanium and the like.
The organometallic compounds used in formulating the lubricants of the invention may be halogen-substituted, may contain sulfur in the molecule and may contain various functional groups such as the carbonyl, hydroxyl and carboxyl groups. Further, the organometallic compound may contain metal-to-metal bonds as, for example, in the case of hexaethyl-digermane. Typical examples of such compound are trimethyl germanium fluoride, triethylgermanium fluoride, trimethyltin iodide, dimethylgermanium dichloride, methylene-bis(trichlorogermane), di-n-propylgermanium oxide, bis(triethylgermyl) amine, di-n-butyltin sulfide, triethyltin hydroxide, bis(triethyltir1) acetylene and diethylgermanium imine.
Since the solubility of the organometallic tin or germanium compounds in diester oils and greases generally decreases as the number of carbon atoms per molecule is increased, a preferred class of organometallic compounds for use as diester additives is represented by the non-aromatic organometallic compounds of tin and germanium wherein each molecule contains from 2 to 36 carbon atoms. It has been found that the compounds within this range are soluble in diester oils to the extent required to form an effective lubricant film on the surface of the rubbing members during use of the lubricant. At the same time, because of the solubility of the preferred organometallic compounds in diester oils, the concentration of the organometallic compound is uniform throughout the lubricant and forms a stable composition which remains constant over extended periods of time during shipment and storage. Compounds having branched chain hydrocarbon constituent groups are generally more unstable than are their straight chain counterparts and thus, straight chain substitution is generally found to produce a better diester lubricant additive.
Methods for the preparation of the organometallic tin and germanium compounds used in formulating the lubricant compositions of the invention are set forth in Die Chemie der metallorganischen Verbindungen by Drs. Krause and von Grosse. The book was produced in the form of a Photo-Lithoprint Reproduction by Edwards Brothers, Inc., of Ann Arbor, Michigan, in 1943 under the authority of the Alien Property Custodian, License No. A-245.
The polyester lubricant base materials used in formulating the lubricant compositions of my invention may be either oils or greases. The oils may be formed by the reaction of a polycarboxylic acid with a mono-hydric alcohol, the reaction of a polyhydric alcohol with a monocarboxylic acid, reaction between a polyhydric alcohol and a polycarboxylic acid, or combinations of the above reactions, such as, for example, reaction of a dicarboxylic acid with a glycol and a mono-hydric alcohol, reaction of a glycol with a dicarboxylic acid and a mono-carboxylic acid, or the reaction of a glycol, a mono-hydric alcohol, a dicarboxylic acid and a mono-carboxylic acid. The acids may be mono-carboxylic aliphatic acids such as, for example, propionic acid, valeric acid, Z-ethyl enanthic acid, 2,2-di-propyl butyric acid or 3-(2-methylhexyl) valeric acid. They may contain unsaturated linkages, such as, for example, in senecioic acid, sorbic acid, or angelic acid; they may be polycarboxylic aliphatic acids such as succinic acid, glutaric acid, azelaic acid, S-octene- 1,8-dicarboxylic acid, or 3-hexene-2,3,4-tricarboxylic acid, and they may be aromatic or cycloaliphatic acids, such as cyclohexaneacetic acid, 1,4-cyclopentylenebis acetic acid, phthalic acid, hemimellitic acid, and terephthalic acid.
The alcohols used in preparing the polyester lubricant base materials may be aliphatic mono-hydric alcohols such as propanol, 2-ethy1-3-hexenol, 2-ethyl-4-propyl heptanol, 2-butenol, or Z-methyl propanol. They may be polyhydric aliphatic alcohols, such as, 1,6-hexamethylene glycol, 1,l-decamethylene glycol, 2-hexene-1,6-diol, and
1,6-heptylene glycol, and they may be mono or polyhydric alicyclic or aromatic alcohols, such as 4-[m-(2-hydroxyethyl) phenyl] butanol, 3-(2-hydroxyethyl) cyclohexanebutanol, p-(hydroxymethyl) phenethyl alcohol, a-methylp.xylene-a,a-diol, 1,4 cyclohexane-B,[3'-diethyl-dimethanol, 2,3-bis(4-hydroxybutyl) benzyl alcohol, 4,4'-[3-(3- hydroxyhexyl)-o-phenylene] dibutanol, and 5-[3-(3-hydroxypropyl) cyclopenta-2,4-dienylene] 3-ethyl amyl alcohol.
The polyester base greases used in formulating lubricant compositions of the invention are formed by admixing a soap with a diester oil. Such soaps may be derived from animal or vegetable fats or fatty acids, wool grease; rosin, or petroleum acids. Typical examples of such soaps are lead oleate, lithium stearate, aluminum tristearate, calcium glycerides, sodium oleate and the like. In addition, the diester greases may contain unreacted fat, fatty acids, and alkali; unsaponifiable matter including glycerol and fatty alcohols; rosin or wool grease; water; and certain additives which may function as modifiers or peptizers.
When taken in their broadest sense, the lubricant compositions of my invention include the addition of an organometallic compound of tin or germanium, as described hereinbefore, to any known polyester lubricant material. More specifically, however, I have found that lubricant compositions comprising an organometallic compound of tin or germanium admixed with a diester, as set forth in the following generic formula, provide superior lubricant compositions and it is these lubricant compositions which are particularly preferred within the scope of my invention. The diester lubricant materials used in formulating the preferred lubricant compositions have the following generic formula:
COOR:
where R is divalent aliphatic hydrocarbon radical which may be saturated or unsaturated and has from 2 to 8 carbon atoms and R and R are branched chain alkyl groups having at least 4 carbon atoms.
As shown by the above generic formula, the diesters utilized in formulating the preferred lubricant compositions, including esters of succinic, glutaric, adipic, pimelic, suberic, azelaic and sebacic acid. Typical examples of such esters are diisooctyl azelate, di(2-ethylhexyl) sebacate, di-sec-amyl sebacate, diisooctyl adipate, di(2- ethylhexyl) adipate, di(2-ethylhexyl) azelate, di(l-methyl- 4-ethyloctyl) glutarate, di-isoamyl adipate, di(2-ethylhexyl) glutarate, di(2-ethylbutyl) adipate, di-tetradecyl sebacate and di(2-ethylhexyl) pinate.
The preferred diesters are prepared by esterifying one mole of a dicarboxylic acid having the general formula: HOOC(CH COOH, where x is an integer of from 2 to 8, with 2 moles of a branched chain alcohol containing at least 4 carbon atoms. Typical of the reactions embraced herein are the reactions of succinic, glutaric, adipic, pimelic, suberic or azelaic acid with sec-amyl alcohol, 3-methyl butanol, 2 ethyl hexanol or the branched chain secondary alcohols undecanol or tetradecanol.
The preferred diester lubricant fluids have molecular weights ranging from about 300 to about 600 and freezing and pouring points from about -40 to less than about F. The flash and fire points range from about 300 F. to about 500 F. and their spontaneous ignition temperatures range from about 100 to about 800 F. The diesters made by reacting a dicarboxylic acid with a branched chain alcohol have been found to have supen'or viscometric properties as compared with diesters made by reacting dihydric alcohols with monocarboxylic acids, and thus, diesters prepared by the former method are preferred in formulating the lubricant compositions of my invention.
In formulating the polyester grease compositions within the scope of my invention, I have found that the greases prepared by admixing a lithium soap with the polyester oils have superior oxidative stability as compared with greases formulated with other soaps, such as, for example, the sodium, calcium or lead soaps. Thus, the polyester greases employing a lithium soap constitute a preferred embodiment of lubricant compositions within the scope of my invention.
In order to further illustrate the lubricant compositions of my invention, there are set forth the following examples showing typical lubricant compositions within the scope of the present invention. Unless otherwise specified, proportions given in these examples are on a weight basis.
Example I One part of tetramethyltin is blended with 99 parts of diisooctyl adipate having a viscosity of 35.4 SUS -at 210 F., a viscosity of 57.3 SUS at 100 F, a Viscosity of 3,980 SUS at -40 F. and a viscosity of 22,500 at 65 F. Its viscosity index is 143, its ASTM pour point is below 80 F. and its specific gravity (60 F./ 60 F.) is 0.926.
Example II Five parts of di-n-propylgermanium oxide are blended with di(1-metl1yl-4-ethyloctyl) glutarate. Di(1-methy1-4- ethyloctyl) glutarate has a freezing point of -80 F, a specific gravity, (1 of 0.901, a kinematic viscosity of 3.45 centistokes at 210 F., 15.9 centistokes at 100 F., 485 centistokes at F. and 7,430 centistokes at 40 F.
Example 111 Eight parts of tetraeicosylgarmanium are blended with 92 parts of grease comprising 12 percent of lithium stearate, 1 percent of polybutene (12,000 molecular weight), 0.2 percent of 4-tert-butyl-2-phenyl phenol, 2 percent of calcium xylyl stearate, 33.8 percent of di(2-ethylhexyl) sebacate and 51 percent of di(2-ethylhexyl) adipate.
Example IV To 99.9 parts of diethylphthalate is added 0.1 part of tetradodecyltin. Diethylphthalate has a freezing point of 27 F. and a specific gravity, d of 1.114. Its viscosity at 210 F. is 1.73 centistokes, at 100 F. is 6.26 centistokes and at 0 F. is 121 centistokes.
Lubricant compositions similar to that of Example IV are prepared by adding 0.1 part of tetradodecyltin to 99.9 parts of one of the following diester fluids: bis(2-ethyl hexyl) terephthalate, 2-butylhexyl 3-(2-butylhexyloxycarbonyl) 2,4 cyclopentadienepropionate, tris(2-ethylpentyl)trimesate, 2,1l-diethyldodecamethylene 1,4-cyclohexane-diacetate, 2,l4-dipropylpentadecamethylene terephthalate, 1,3-cyclopentylenebis(3 ethylhexamethylene) terephthalate, and 2,16-diethylheptadecamethylene pimelate.
Example V Five parts of tetraethylgermanium are blended with 95 parts of diisooctyl azelate having a kinematic viscosity of 3.34 centistokes at 210 F., 7000 centistokes at 65 F. (ASTM 445-52T), an ASTM slope from 40 to 210 F. of 0.693 (ASTM D341-43) and a pour point of 85 F. (ASTM D97-47). Its flash point is 425 F. (ASTM D92-52), and is specific gravity is 0.9123 at 25 C.
Example VI To 97 parts of diisoamyl adipate is added 3 parts of dimethyltin sulfide. Diisoamyl adipate has a viscosity of 1.71 centistokes at 210 F., 4.93 centistokes at 100 F., 180 centistokes at 40 F. and 840 centistokes at 65 F. Its viscosity index is 125, its ASTM pour point is below 80 F. and its specific gravity (60 F./ 60 F.) is 0.938.
6 Example VII Seven parts of dimethylgermanium' dihydroxide are blended with 93 parts of di-sec-amyl sebacate. Di-secamyl sebacate has a viscosity of 34.2 Saybolt Universal seconds (SUS) at 210 F., a viscosity of 51.7 SUS at 100 F., a viscosity of 2,660 SUS at 40 F. and a viscosity of 15,100 SUS at 65 F. Its viscosity index is 130, its pour point is below F. and its specific gravity (60 F./60 F.) is 0.915.
Example VIII Example IX Three parts of di-n-butyltin sulfide are blended and mixed with 97 parts of a grease comprising 12.5 percent of lithium stearate, 1 part of polybutene (12,000 molecular weight), 0.2 percent of 4-tert-butyl-2-phenyl phenol, 2 percent of calcium xylyl stearate and 84.3 percent of di(2-ethylhexyl) sebacate.
Example X lFour parts of bis-triethylgermanium sulfide are blended with 96 parts of di(2-ethylhexyl) sebacate having a viscosity of 37.4 SUS at 210 F., 68.9 SUS at 100 F., 6,410 SUS at 40 F. and 35,800 SUS at 65 F. Its viscosity index is 154, its ASTM pour point is below 80 F. and its specific gravity (60 F./60 F.) is 0.912.
Example XI To 99 parts of di(2-ethylbutyl) adipate is added l'part of triethylgennanium bromide. Di(2-ethylbuty1) adipate has a freezing point of 15 F., a specific gravity, d of 0.934, a viscosity of 1.89 centistokes at 210 F., a viscosity of 5.68 centistokes at 100 F., a viscosity of 51 centistokes at 0 F. and a kinematic viscosity index of 123.
Example XII Ten parts of bis(triethylgermanium) amine are mixed with parts of a grease comprising 11 percent of lithium stearate, 0.4 percent of 4-tert-butyl-2-phenyl phenol, 1 percentof polybutene 12,000 molecular weight), 1 percent of sorbitan monooleate and 86.6 percent of di [1-(2- methylpropyl)-4-ethyloctyl] sebacate.
Example XIII Seven parts of di-n-butyltin dilaurate are blended with 93 parts of 1,6-hexamethylene glycol di(2-ethylhexanoate). 1,6-hexamethylene glycol di(2-ethylhexanoate) has a specific gravity, d of 0.908, a viscosity of 2.35 centistokes at 210 F., a viscosity of 8.64 centistokes at F., a viscosity of 129 centistokes at 0 F. and a viscosity of 1,090 centistokes at 40 F. Its kinematic viscosity index is 96 and its ASTM slope from -40 F. to 210 F. is 0.79.
Example XIV Two parts of dicyclohexyl-diethyl tin are blended with 98 parts of di(2-ethylhexyl) azelate having a kinematic viscosity of 2.96 centistokes at 210 F., 11 centistokes at 100 F., 1,150 centistokes at '40 F., and 6,400 centistokes at -65 F. as measured by the test set forth in ASTM 445-42T. Its ASTM slope from 40 F. to 210 F. is 0.724 (ASTM D34l-43), its pour point is l00 F. (ASTM D97-47), its flash point is 420 F. (ASTM D92-52) and its specific gravity, as measured at 25 C., is 0.9124.
7 Example XV Four parts of tetra-allyltin are blended and mixed with 96 parts of a grease comprising 12 percent of lithium stearate, 2.5 percent of polybutene (12,000 molecular weight), 0.2 percent of 4-tert-butyl-2-phenyl phenol and 85.3 percent of di(2-ethylhexyl) adipate.
Example XVI Six parts of hexaethyl digermane are blended and mixed with 94 parts of a grease consisting of 12 percent of lithium stearate and 88 percent of di(2ethylhexyl) sebacate.
Other lubricant compositions similar to the lubricant of Example XVI are prepared by mixing 6 parts of hexaethyl digermane with grease compositions comprising 88 percent of di(2-ethylhexyl) sebacate admixed respectively with calcium stearate, lead naphthenate, barium oleate, strontium stear ate and magnesium stearate.
Numerous lubricant compositions containing a polyester oil or grease and an organometallic compound as defined above were tested in a four-ball wear machine to determine the lubricity of the respective lubricant compositions relative to operation with non-additive polyester oils or greases. The four-ball wear machine is described by Larsen and Perry in the Transactions of the A.S.M.E., January 1945, pp. 45-50.
The four-ball wear machine utilizes four balls of equal size arranged in a tetrahedral formation. The bottom three balls are held in a non-rotatable fixture which is essentially a universal chuck that holds the balls in abutting relation to each other. Since the bottom three balls are of equal size, their centers form the apices of an equilateral triangle. The top ball is afiixed to a rotatable spindle whose axis is positioned perpendicularly to the plane of the ball holder and in line with the center point of the triangle whose apices are the centers of the three bottom stationary balls.
In operation, the four balls are immersed in the lubricant composition to be tested and the fixture holding the three bottom balls is moved upwardly so as to bring the three fixed lower balls into engagement with the upper rotating ball. To increase the load, the fixture is moved upwardly and axially of the rotating spindle aflixed to the upper ball.
The lubricity of the lubricant under test is determined by the amount of wear occurring on the lower balls at the points of contact with the upper rotating ball. If the lubricant is completely effective, the amount of wear will be negligible. On the other hand, if the lubricant is not completely efiective under the test conditions, the upper ball may weld or seize to the lower balls due to the heat of friction at the contact points, or the wear which occurs will be excessive. If seizure does not occur, the average diameter of the circular scar areas of the lower balls is measured so as to give a quantitative basis for comparing the test results with those of other tests. As the severity of the test conditions is increased with a given lubricant composition, the likelihood of excessive wear of the lower balls is increased.
To illustrate the effectiveness of the lubricant compositions of my invention, the following examples are set forth which show the superiority of my lubricant compositions when they are tested in a four-ball wear machine.
Example XVII Non-additive-containing di(2-ethylhexyl) sebacate was run in the four-ball wear machine under the following test conditions: the speed of rotation of the upper ball was 572 r.p.m., the test temperature was 50 C., and the balls were /2 inch in diameter and constructed of SAE 52-100 steel. The machine was run for two hours under the above conditions at a loading of l kilogram, after which the balls were disassembled and the average scar diameter on the lower three balls was measured and found to be 0.15 millimeter.
Example XVIII Non-additive-containing d i(2-et hylhexyl) sebacate was run in the four-ball wear machine for two hours at a loading of 2.5 kilograms under the test conditions utilized in Example XVII. The average scar diameter on the lower three balls was 0.30millimeter.
Example XIX Non-additive-containing di(2-ethylhexyl) sebacate was run in the four-ball wear machine under the test condi' tions utilized in Examples XVII and XVIII for a period of two hours at a loading of 10 kilograms. The average scar diameter on the lower three balls was 0.53 millimeter.
Example XX A lubricant composition comprising 5 parts by weight of di-n-butyltin sulfide admixed with parts of di(2- ethylhexyl) sebacate was run in the four-ball wear machine under the identical test conditions utilized in Example XVII, namely, a two hour run at a 1 kilogram loading. The average scar diameter on the lower three balls was measured and found to be 0.11 millimeter.
Example XXI The lubricant composition used in Example XX was run in the four-ball wear machine under the identical test conditions utilized in Example XVIII. The average scar diameter on the lower three balls was 0.14 millimeter.
Example XXII The lubricant composition utilized in Example XX was run in the four-ball wear machine under the identical test conditions utilized in Example XIX, namely, a two hour run at a 10 kilogram loading. The average scar diameter on the lower three balls was 0.26 millimeter.
The comparison of the test results set forth in Examples XVII through XXII clearly demonstrates the Superiority of the lubricant composition of the invention over the non-additive-containing di(2-ethylhexyl) sebacate. The lubricant composition of the invention was more etfective than the base lubricant at loads of 1, 2.5 and 10 kilograms with the effectiveness being more marked as the load was increased. Thus, the average scar diameter obtained in the 2.5 and 10 kilogranrloading was approximately one half that obtained when utilizing the non-additive-containing lubricant material under the same test conditions.
Further tests are conducted in the four-ball wear machine as follows:
Example XXIII Two lubricant compositions, one being di(2-ethylhexyl) glutarate and the other being the lubricant composition of Example VIII are tested in the four-ball wear machine under the following conditions:
The upper ball rotating at a speed of 572 rpm, the ambient temperature being 50 C. and the balls being /2 inch in diameter and constructed of SAE 52-100 steel. When the respective lubricant compositions are subjected to identical loadings for identical times in the four-ball wear machine under the above conditions, the lubricant composition of the invention, namely the composition of Example VIII is far superior to the non-additive'containing diisooctyl azelate.
Example XXIV 9 for identical times, the lubricant composition of the invention, namely that set forth in Example XII, will prove far superior to the non-organometallic-containing polyester grease composition.
Example XXV When tested in the four-ball wear machine under the conditions of Examples XXIII and XXIV, a lubricant composition of the invention comprising parts of tetraethyl germanium blended with 95 parts of diisooctyl azelate provides superior lubrication as compared with the lubrication provided by non-additive-containing diisooctyl azelate.
Example XXVI A non-additive-containing diester lubricant comprising solely diisoamyl adipate was run in the four-ball wear machine under the following test conditions: the speed of rotation of the upper ball was 572 r.p.m., the testing temperature was 50 C., and the balls were /2 inch in diameter and constructed of SAE 52l00 steel. Following a two hour run at a load of 20 kilograms, the balls were disassembled and the average scar diameter on the lower three balls was 0.95 millimeter.
Example XXVII A lubricant composition comprising parts by weight of di-n-butyltin dilaurate admixed with 90 parts of diisoamyl adipate was run in the four ball wear machine for two hours at a loading of 20 kilograms under the same test conditions utilized in Example XXVI. The average scar diameter on the lower three balls was measured and found to be 0.72 millimeter.
Example XX VIII Non-additive-containing di-tridecyl azelate was tested in the four-ball wear machine under the same general conditions utilized in Examples XXVI and XXVII. The loading applied was 40 kilograms for a period of two hours after which the balls were disassembled and the average scar diameter on the lower three balls was measured and found to be 0.62 millimeter.
Example XXIX A lubricant composition comprising 5 parts by Weight of di-n-butyltin sulfide admixed with 95 parts of di-tridecyl azelate was tested under the identical conditions utilized in Example XXVIII, namely, a 40 kilogram loading applied for 2 hours. The average scar diameter on the lower three balls was 0.39 millimeter.
The results set forth in Example XXIII through XXIX clearly demonstrate superiority of my lubricant compositions as compared with non-additive-containing diester lubricant materials. The scar diameter obtained in Example XXVII was reduced to approximately 76 percent of the scar diameter obtained in Example XXVI, utilizing the same base diester material under identical test conditions. The scar diameter obtained in Example XXIX is approximately 63 percent of that obtained in Example XXVIII utilizing the same base diester lubricant material under identical test conditions. This is an even more striking improvement than is afforded by the com arisen between Examples XXVI and XXVII. The results in Examples XXIII through XXIX illustrate the effectiveness of my lubricant compositions over a wide range of organotin and organogermanium compounds admixed with a wide range of diester lubricant materials at loads up to 40 kilograms, so' as to obtain effective lubrication in a manner heretofore unknown in the lubrication art.
Further wear testing of the lubricant compositions of the invention was done in the four-ball wear machine utilizing rubbing surfaces other than steel. The following examples illustrate the results obtained from these tests.
Example XXX A non additive lubricant composition comprising 50 parts by weight of di(Z-ethylhexyl) sebacate, blended with 50 parts of diisoamyl adipate was tested in the four-ball wear machine under the following conditions: the speed of rotation of the upper ball was 572 r.p.m., the test temperature was 50 C., the three stationary bottom balls were /2 inch in diameter and constructed of brass, and the upper ball was /2 inch in diameter and constructed of SAE 52-100 steel. The lubricant was tested for one hour under the above conditions at a 10 kilogram loading, whereupon the balls were disassembled and the average scar diameter on the bottom three brass balls was found to be 0.85 millimeter.
Example XXXI A lubricant composition comprising 7 parts by weight of tri-n-butyltin chloride admixed with parts of the diester lubricant utilized in Example XXX, was tested in the four-ball wear machine under the identical conditions utilized in Example XXX. Following the test, which comprised a 10 kilogram loading for a period of one hour, the average scar diameter on the stationary brass balls was found to be 0.55 millimeter.
Example XXXII Non-additive-containing di(2-ethylhexyl) sebacate was tested in the four-ball wear machine under the following conditions: the speed of rotation of the upper ball was 79 r.p.m., the test temperature was 50 C., the balls were /2 inch in diameter, constructed of hard steel and having a 0.001 inch thickness of gold plating thereon. Two runs were conducted under a 0.5 loading at the above conditions. Seizure occurred at the end of 18 minutes in the first run and after 11 /2 minutes in the second run, and was manifested in each case by rapid extensive tearing of the gold plate on the balls and the formation of large particles of debris.
Example XXXIII A lubricant composition comprising 5 parts by weight of di-n-butyltin sulfide admixed with parts of di(2- ethylhexyl) sebacate Was tested in the four-ball wear machine under the identical conditions used in Example XXXIII. Effective lubrication was achieved for a period of two hours at the 0.5 kilogram loading.
The results of Examples XXX through XXXIII further demonstrate the increased lubricating effectiveness of the lubricant compositions of the invention as compared with non-additive-containing diester materials. Comparison of the results obtained in Examples XXX and XXXI shows a reduction in scar diameter, achieved through the additive use of 7 parts of tri-n-butyltin chloride, to 64.5 percent of that obtained when utilizing a 5050 non-additive-containing mixture of di(Z-ethylhexyl) sebacate and diisoamyl adipate. The results of Examples XXXII and XXXIII even more strikingly illustrate the eflf ctiveness of my lubricant compositions. In Example XXXIII, utilizing a composition of the invention, efiective lubrication was obtained for two hours, whereas, with the non-additive-containing lubricant composition of Example XXXII the average time to seizure was 14.7 minutes. In terms of the time of effective lubrication, Example XXXIII represents an increase in lubricating eifectiveness of approximately 8 times that obtained in Example XXXII.
As shown by the preceding examples, the lubricity of polyester lubricant compositions are greatly increased by the addition thereto of organometallic compounds of tin or germanium. This enables the utilization of polyester base lubricants in applications heretofore found impossible such as, .for example, utilization under extreme pressure conditions in the lubrication of rubbing surfaces which are relatively inert.
The lubricating effectiveness of the lubricant compositions of my invention may be greatly increased by proper running-in of the lubricant composition between the rubbing surfaces to be lubricated. The running-in comprises subjecting the rubbing surfaces when in contact with the lubricant composition of the invention to a loading that is initially low, being well below the operating load. This load is maintained for a time suflicient to build up a film on the rubbing surfaces that is formed from the degradation of the organometallic additive component in the lubricant. Subsequently the load is increased up to the operating load. Variations of this procedure may involve: (l) Gradually increasing the load during the period of film formation; that is to say, the initially low loading is gradually increased at such rate that the build-up of a degradation film on the rubbing surfaces is substantially complete before the operating load is attained and (2) utilizing a constant loading during the period of film formation, which load is not increased until the build-up of a degradation film from the organometallic additive on the rubbing surfaces is substantially complete.
Although the lubricating mechanism which takes place when utilizing a lubricant of my invention, is not precisely understood, it is believed that it involves a film formation on the rubbing surfaces due to degradation of the organometallic tin or germanium component in the lubricant. Inasmuch as this film formation requires time and is not an instantaneous phenomenon, the mechanism is not effective when the lubricating surfaces are subjected to an initially high loading, since the loading causes failure before a film can be formed on the rubbing surfaces. The aforementioned method takes cognizance of this fact by allowing suflicient time for build-up of the degradation film on the rubbing surfaces before the application of high loads to the rubbing system. In this manner, the lubricant compositions of my invention are utilized to their full effectiveness so as to enable the utilization of polyester base lubricants in a manner heretofore found impossible.
The beneficial effects of my method are illustrated by way of the following examples:
Example XXXIV When the lubricant composition set forth in Example VI is run in the four-ball wear machine under the following test conditions in which the speed of rotation of the upper ball is 79 rpm, the ambient temperature is 50 C., the 4 balls are /2 inch in diameter, constructed of 52-100 steel and having a 0.001 inch coating of pure gold, the following results are obtained. The lubricant composition is subjected in one test run to an initial loading of kilograms, whereas, in a second test run, the lubricant composition is run for 120 minutes at a load of l kilogram, after which loads of 2.5, 10, and kilograms are applied for 2 /2 minute intervals respectively. When so tested, the lubricant composition is effective in providing lubrication during the second test run at loads above those at which failure occurs in the first test run.
Example XXXV The lubricant composition of Example XII is tested in the four-ball Wear machine under the conditions of Example XXXIV, and is found effective under the conditions of the second test run at loads in excess of the loading which in the first test run will cause failure.
Example XXXVI The lubricant composition of Example VIII is tested under the same conditions as in Examples XXXIV and XXXV, and provides effective lubrication when utilized with a running-in period, as in the second test run, at loads in excess of the high initial loads which cause almost instantaneous failure in the first test run.
The method illustrated in Examples XXXIV through XXXVI finds application when utilizing any of the lubricant compositions of my invention. Thus, it will be found that the lubricating effectiveness of, for example, the lubricant composition of Example II comprising 5 parts of di-n-propyl germanium oxide in parts of di(lmethyl-4-ethyloctyl) glutarate, the lubricant composition of Example I comprising one part of tetramethyltin in 99 parts of diisooctyl adipate, the composition of Example IX comprising 3 parts of di-n-butyltin sulfide mixed with 97 parts of a grease comprising 12.5 percent of lithium stearate, 1 part of polybutene (12,000 molecular weight), 0.2 percent of 4-tert-butyl-2-phenyl phenol, 2 percent of calcium xylyl stearate and 84.3 percent of di(Z-ethylhexyl) sebacate, or the composition of Example X comprising 4 parts of bis-triethylgermanium sulfide in 96 parts of di(Z-ethylhexyl) sebacate are greatly improved when utilized according to the method heretofore set forth.
The many examples set forth in the preceding portions of this specification are by way of illustration only and should not be construed as in any way limiting the scope of my invention. Obvious variations within the scope of the invention will be readily apparent to one skilled in the art such as for example, using a plurality of organometallic compounds of tin or germanium as additives to a single polyester base lubricant, or in varying the time, load and lubricant composition from those set forth in Examples XXXIV through XXXVI. Other variations within the scope of my invention include the utilization of polyester lubricant materials, other than those set forth in the preceding examples, in formulating my lubricant compositions. Such polyester lubricant materials would include esters of polycarboxy-substitutedheterocyclic-ring compounds, polyhydric-substituted-heterocyclic-ring compounds and aliphatic polyhydric and polycarboxy compounds containing elements such as sulfur and nitrogen in their structure.
Further, the polyester base lubricant material may consist of a complex mixture of various esters, such as, for example, a mixture of an azelate with a glycol ester or a diester derived from a polycarboxylic acid other than azelaic acid, or a mixture of a complex polyester with such components as mono-esters or diesters, ether esters, glycols, polyglycols, glycol ethers, formals, polyformals, or blends of two or more of such components, and may include a polysiloxane admixed therewith.
The lubricant compositions of my invention may also contain other compounds, such as soaps, antioxidants, thickeners, and antifoaming agent additives which are present in commercial polyester lubricants, since such additives in no way inhibit the effectiveness of the lubricant compositions of the invention. The lubricant compositions of my invention are not restricted to use with any particular rubbing system, metal or non-metal, since their mechanism of operation is effective in lubricating any combination of rubbing surfaces. Their greatest utility, however, is found in lubricating chemically inactive rubbing surfaces since it is in this area that conventional E.P. additives are ineffective.
A further utility of the lubricant compositions of the invention is in lubricating electrically conductive noble metal rubbing systems, such as, for example, the silversilver of silver-graphite contacts found in electrical switches, relays, motors and electrical generating equipment. The lubricant films laid down by many of the lubricant compositions of the invention have high electrical conductivity and, therefore, would not inhibit the transfer of electrical current between the rubbing members.
Having set forth and described the invention fully by way of the preceding examples and explanation, I deside to be limited only by the scope of the following claims which define my invention.
I claim:
1. A composition of matter adapted for lubricating rub- /COOR1 R Where R contains from two to eight carbon atoms and is a divalent aliphatic hydrocarbon radical selected from the group consisting of saturated and unsaturated radicals, and R and R are branched chain alkyl groups containing from four to about 14 carbon atoms, said diester having admixed therewith from about 0.1 to about percent of a compound selected from the class consisting of tetraalkyltin compounds and tetraalkylgermanium compounds.
2. The lubricating composition of claim 1 wherein said compound is tetraethylgermanium.
3. The lubricating composition of claim 1 wherein said compound is tetramethyltin.
4. A method for lubricating rubbing surfaces with a lubricant consisting essentially of a diester base lubricant having the formula COOR:
where R contains from two to eight carbon atoms and is a divalent aliphatic hydrocarbon radical selected from the group consisting of saturated and unsaturated radicals and R and R are branched chain alkyl groups containing from four to about 14 carbon atoms, said diester having admixed therewith from about 0:1 to about 10 percent of a compound selected from the class consisting of tetra-alkyltin compounds and tetraalkylgermanium compounds, which method comprises rubbing the surfaces together in the presence of said lubricant at a load which is below the operating load until a film is formed on the rubbing surfaces from the degradation of said compound, and thereafter increasing the load up to the operating load.
References Cited in the file of this patent UNITED STATES PATENTS 2,187,802 Colin et a1. Jan. 23, 1940 2,257,750 Lincoln et a1. Oct. 7, 1941 2,288,288 Lincoln June 30, 1942 2,334,566 Lincoln Nov. 16, 1943 2,354,218 Murray July 25, '1944 2,417,833 Lincoln et a1 Mar. 25, 1947 2,499,984 Beavers et a1. Mar. 7, 1950 OTHER REFERENCES Atkins et .al.: Development of Additives and Lubricating Oil Compositions, Ind. and Eng. Chem, vol. 39, No. 4, April 1947, pages 491-497.
Christensen: The Development of a Turbo-Prop Synthetic Lubricant, Lubr. Eng, August 1952, pages 177-200.
Zuidema: The Performance of Lubricating Oils, Reinhold Pub. Corp., N.Y., 1952, pages 6 and 7.
Claims (1)
1. A COMPOSITION OF MATTER ADAPTED FOR LUBRICATING RUBBING SURFACES, WHICH COMPOSITION CONSISTS ESSENTIALLY OF A DIESTER BASE LUBRICANT HAVING THE FORMULA
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US752414A US3077451A (en) | 1957-12-17 | 1958-08-01 | Lubricant compositions |
US759416A US3063943A (en) | 1957-12-17 | 1958-09-08 | Lubricant compositions |
GB40499/58A GB907664A (en) | 1957-12-17 | 1958-12-16 | Lubricant material |
FR781860A FR1234139A (en) | 1957-12-17 | 1958-12-17 | Improved lubricating compositions |
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US3251661A (en) * | 1961-11-15 | 1966-05-17 | Ethyl Corp | Two-cycle internal combustion engine fuel |
US3442806A (en) * | 1966-12-22 | 1969-05-06 | Ethyl Corp | Stabilized organic material |
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US3303132A (en) * | 1964-03-19 | 1967-02-07 | Mobil Oil Corp | High temperature lubricating compositions |
US3511782A (en) * | 1967-05-29 | 1970-05-12 | Ethyl Corp | Synthetic ester lubricants containing trihydrocarbyl tin sulfides and phenothiazines |
US3489683A (en) * | 1967-05-29 | 1970-01-13 | Ethyl Corp | Synergistic antioxidant compositions |
US3530069A (en) * | 1969-03-10 | 1970-09-22 | Ethyl Corp | Stabilized organic material |
US4462935A (en) * | 1982-07-12 | 1984-07-31 | Gulf Research & Development Company | Quaternary phosphonium thiostannates |
JPS61266494A (en) * | 1985-05-20 | 1986-11-26 | Nippon Mining Co Ltd | Lubricating oil used in flon atomosphere |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2511250A (en) * | 1947-11-14 | 1950-06-13 | Gulf Research Development Co | Stabilized extreme pressure lubricants |
US2891922A (en) * | 1951-07-07 | 1959-06-23 | Metal & Thermit Corp | Organo tin compounds and compositions containing same |
US2642395A (en) * | 1952-02-08 | 1953-06-16 | Dow Corning | Siloxane boundary lubricants |
US2789103A (en) * | 1954-01-29 | 1957-04-16 | Metal & Thermit Corp | Rubber stabilized with hydrocarbon tin compounds |
-
1957
- 1957-12-17 US US703286A patent/US3058912A/en not_active Expired - Lifetime
-
1958
- 1958-03-25 US US723640A patent/US3036972A/en not_active Expired - Lifetime
- 1958-08-01 US US752414A patent/US3077451A/en not_active Expired - Lifetime
- 1958-09-08 US US759416A patent/US3063943A/en not_active Expired - Lifetime
- 1958-12-16 GB GB40499/58A patent/GB907664A/en not_active Expired
- 1958-12-17 FR FR781860A patent/FR1234139A/en not_active Expired
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2187802A (en) * | 1937-09-25 | 1940-01-23 | Tide Water Associated Oil Comp | Lubricating oil and lubrication therewith |
US2288288A (en) * | 1938-08-26 | 1942-06-30 | Socony Vacuum Oil Co Inc | Lubricating oil |
US2257750A (en) * | 1939-05-24 | 1941-10-07 | Continental Oil Co | Lubricating oil |
US2334566A (en) * | 1940-03-11 | 1943-11-16 | Lubri Zol Dev Corp | Lubricating oil |
US2354218A (en) * | 1940-06-03 | 1944-07-25 | Indium Corp America | Operation and lubrication of mechanical apparatus |
US2417833A (en) * | 1944-04-22 | 1947-03-25 | Continental Oil Co | Lubricant |
US2499984A (en) * | 1948-12-16 | 1950-03-07 | Rohm & Haas | Oily complex esters |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3251661A (en) * | 1961-11-15 | 1966-05-17 | Ethyl Corp | Two-cycle internal combustion engine fuel |
US3442806A (en) * | 1966-12-22 | 1969-05-06 | Ethyl Corp | Stabilized organic material |
Also Published As
Publication number | Publication date |
---|---|
US3077451A (en) | 1963-02-12 |
US3058912A (en) | 1962-10-16 |
GB907664A (en) | 1962-10-10 |
US3063943A (en) | 1962-11-13 |
FR1234139A (en) | 1960-10-14 |
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