EP2824166A1 - Grease composition - Google Patents
Grease composition Download PDFInfo
- Publication number
- EP2824166A1 EP2824166A1 EP13757011.5A EP13757011A EP2824166A1 EP 2824166 A1 EP2824166 A1 EP 2824166A1 EP 13757011 A EP13757011 A EP 13757011A EP 2824166 A1 EP2824166 A1 EP 2824166A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- amide
- grease composition
- base oil
- acid
- compound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 51
- 239000004519 grease Substances 0.000 title claims abstract description 48
- 239000000314 lubricant Substances 0.000 claims abstract description 66
- -1 amide compound Chemical class 0.000 claims abstract description 57
- 239000002199 base oil Substances 0.000 claims abstract description 44
- 239000007787 solid Substances 0.000 claims abstract description 28
- 229910052751 metal Inorganic materials 0.000 claims abstract description 25
- 239000002184 metal Substances 0.000 claims abstract description 25
- 239000000344 soap Substances 0.000 claims abstract description 22
- 239000002562 thickening agent Substances 0.000 claims abstract description 22
- 150000001875 compounds Chemical class 0.000 claims abstract description 16
- FTQWRYSLUYAIRQ-UHFFFAOYSA-N n-[(octadecanoylamino)methyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCNC(=O)CCCCCCCCCCCCCCCCC FTQWRYSLUYAIRQ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229920005989 resin Polymers 0.000 abstract description 19
- 239000011347 resin Substances 0.000 abstract description 19
- 125000004432 carbon atom Chemical group C* 0.000 description 14
- 150000001408 amides Chemical class 0.000 description 13
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 12
- 229910052744 lithium Inorganic materials 0.000 description 12
- 150000002430 hydrocarbons Chemical group 0.000 description 11
- 239000002480 mineral oil Substances 0.000 description 9
- 235000010446 mineral oil Nutrition 0.000 description 9
- 229920006395 saturated elastomer Chemical group 0.000 description 9
- 239000002245 particle Substances 0.000 description 8
- 150000008431 aliphatic amides Chemical class 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 125000003368 amide group Chemical group 0.000 description 6
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 6
- 229920002545 silicone oil Polymers 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 125000001931 aliphatic group Chemical group 0.000 description 5
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 229920013639 polyalphaolefin Polymers 0.000 description 5
- 229910052582 BN Inorganic materials 0.000 description 4
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 239000003963 antioxidant agent Substances 0.000 description 4
- 230000003078 antioxidant effect Effects 0.000 description 4
- 150000008430 aromatic amides Chemical class 0.000 description 4
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 4
- 150000004985 diamines Chemical class 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 4
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 4
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 229920002292 Nylon 6 Polymers 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 125000002723 alicyclic group Chemical group 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- FPLIHVCWSXLMPX-UHFFFAOYSA-M lithium 12-hydroxystearate Chemical compound [Li+].CCCCCCC(O)CCCCCCCCCCC([O-])=O FPLIHVCWSXLMPX-UHFFFAOYSA-M 0.000 description 3
- HGPXWXLYXNVULB-UHFFFAOYSA-M lithium stearate Chemical compound [Li+].CCCCCCCCCCCCCCCCCC([O-])=O HGPXWXLYXNVULB-UHFFFAOYSA-M 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 2
- CRSBERNSMYQZNG-UHFFFAOYSA-N 1-dodecene Chemical compound CCCCCCCCCCC=C CRSBERNSMYQZNG-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-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
- 125000002252 acyl group Chemical group 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 150000007933 aliphatic carboxylic acids Chemical class 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 229940067597 azelate Drugs 0.000 description 2
- HQABUPZFAYXKJW-UHFFFAOYSA-N butan-1-amine Chemical compound CCCCN HQABUPZFAYXKJW-UHFFFAOYSA-N 0.000 description 2
- 150000007942 carboxylates Chemical class 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- SWSBIGKFUOXRNJ-CVBJKYQLSA-N ethene;(z)-octadec-9-enamide Chemical compound C=C.CCCCCCCC\C=C/CCCCCCCC(N)=O.CCCCCCCC\C=C/CCCCCCCC(N)=O SWSBIGKFUOXRNJ-CVBJKYQLSA-N 0.000 description 2
- ZJOLCKGSXLIVAA-UHFFFAOYSA-N ethene;octadecanamide Chemical compound C=C.CCCCCCCCCCCCCCCCCC(N)=O.CCCCCCCCCCCCCCCCCC(N)=O ZJOLCKGSXLIVAA-UHFFFAOYSA-N 0.000 description 2
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 2
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 2
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 229920002493 poly(chlorotrifluoroethylene) Polymers 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 239000005023 polychlorotrifluoroethylene (PCTFE) polymer Substances 0.000 description 2
- 229920006324 polyoxymethylene Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- CPUBMKFFRRFXIP-YPAXQUSRSA-N (9z,33z)-dotetraconta-9,33-dienediamide Chemical compound NC(=O)CCCCCCC\C=C/CCCCCCCCCCCCCCCCCCCCCC\C=C/CCCCCCCC(N)=O CPUBMKFFRRFXIP-YPAXQUSRSA-N 0.000 description 1
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- WTHCRRXOPUNKAA-UHFFFAOYSA-N 16-methylheptadecan-1-amine Chemical compound CC(C)CCCCCCCCCCCCCCCN WTHCRRXOPUNKAA-UHFFFAOYSA-N 0.000 description 1
- RDYWHMBYTHVOKZ-UHFFFAOYSA-N 18-hydroxyoctadecanamide Chemical compound NC(=O)CCCCCCCCCCCCCCCCCO RDYWHMBYTHVOKZ-UHFFFAOYSA-N 0.000 description 1
- XHSVWKJCURCWFU-UHFFFAOYSA-N 19-[3-(19-amino-19-oxononadecyl)phenyl]nonadecanamide Chemical compound NC(=O)CCCCCCCCCCCCCCCCCCC1=CC=CC(CCCCCCCCCCCCCCCCCCC(N)=O)=C1 XHSVWKJCURCWFU-UHFFFAOYSA-N 0.000 description 1
- JRRCCAWVDZVNLV-UZYVYHOESA-N 2-[(z)-hexadec-7-enyl]icosanamide Chemical compound CCCCCCCCCCCCCCCCCCC(C(N)=O)CCCCCC\C=C/CCCCCCCC JRRCCAWVDZVNLV-UZYVYHOESA-N 0.000 description 1
- KXKYGEIWWPMIHA-UHFFFAOYSA-N 2-hexadecylicosanamide Chemical compound CCCCCCCCCCCCCCCCCCC(C(N)=O)CCCCCCCCCCCCCCCC KXKYGEIWWPMIHA-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- ZSEMHRBWSJLCMJ-UHFFFAOYSA-N C(CCCCCCCCCCCCCCC(C)C)(=O)N.C(CCCCCCCCCCCCCCC(C)C)(=O)N.C=C Chemical compound C(CCCCCCCCCCCCCCC(C)C)(=O)N.C(CCCCCCCCCCCCCCC(C)C)(=O)N.C=C ZSEMHRBWSJLCMJ-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- ORAWFNKFUWGRJG-UHFFFAOYSA-N Docosanamide Chemical compound CCCCCCCCCCCCCCCCCCCCCC(N)=O ORAWFNKFUWGRJG-UHFFFAOYSA-N 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- WHUUTDBJXJRKMK-UHFFFAOYSA-N Glutamic acid Natural products OC(=O)C(N)CCC(O)=O WHUUTDBJXJRKMK-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
- CKLJMWTZIZZHCS-REOHCLBHSA-N L-aspartic acid Chemical compound OC(=O)[C@@H](N)CC(O)=O CKLJMWTZIZZHCS-REOHCLBHSA-N 0.000 description 1
- WHUUTDBJXJRKMK-VKHMYHEASA-N L-glutamic acid Chemical compound OC(=O)[C@@H](N)CCC(O)=O WHUUTDBJXJRKMK-VKHMYHEASA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- REYJJPSVUYRZGE-UHFFFAOYSA-N Octadecylamine Chemical compound CCCCCCCCCCCCCCCCCCN REYJJPSVUYRZGE-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000004996 alkyl benzenes Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 235000001014 amino acid Nutrition 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 235000003704 aspartic acid Nutrition 0.000 description 1
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 1
- OQFSQFPPLPISGP-UHFFFAOYSA-N beta-carboxyaspartic acid Natural products OC(=O)C(N)C(C(O)=O)C(O)=O OQFSQFPPLPISGP-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical class OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 238000002050 diffraction method Methods 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- ILRSCQWREDREME-UHFFFAOYSA-N dodecanamide Chemical compound CCCCCCCCCCCC(N)=O ILRSCQWREDREME-UHFFFAOYSA-N 0.000 description 1
- 229940069096 dodecene Drugs 0.000 description 1
- JRBPAEWTRLWTQC-UHFFFAOYSA-N dodecylamine Chemical compound CCCCCCCCCCCCN JRBPAEWTRLWTQC-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 description 1
- 235000013922 glutamic acid Nutrition 0.000 description 1
- 239000004220 glutamic acid Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000008241 heterogeneous mixture Substances 0.000 description 1
- HSEMFIZWXHQJAE-UHFFFAOYSA-N hexadecanamide Chemical compound CCCCCCCCCCCCCCCC(N)=O HSEMFIZWXHQJAE-UHFFFAOYSA-N 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 125000000400 lauroyl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 150000004668 long chain fatty acids Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 125000001419 myristoyl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- NUGCKKMWDPZJCB-UHFFFAOYSA-N octadecanamide;octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(N)=O.CCCCCCCCCCCCCCCCCC(O)=O NUGCKKMWDPZJCB-UHFFFAOYSA-N 0.000 description 1
- IOQPZZOEVPZRBK-UHFFFAOYSA-N octan-1-amine Chemical compound CCCCCCCCN IOQPZZOEVPZRBK-UHFFFAOYSA-N 0.000 description 1
- 125000002801 octanoyl group Chemical group C(CCCCCCC)(=O)* 0.000 description 1
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- MGDIOJPGJAGMGP-UHFFFAOYSA-N pentacosanediamide Chemical compound NC(=O)CCCCCCCCCCCCCCCCCCCCCCCC(N)=O MGDIOJPGJAGMGP-UHFFFAOYSA-N 0.000 description 1
- 239000010702 perfluoropolyether Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 235000021003 saturated fats Nutrition 0.000 description 1
- 150000004671 saturated fatty acids Chemical class 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 125000003696 stearoyl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/06—Mixtures of thickeners and additives
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/065—Sulfides; Selenides; Tellurides
- C10M2201/066—Molybdenum sulfide
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/087—Boron oxides, acids or salts
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/10—Compounds containing silicon
- C10M2201/105—Silica
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
- C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
- C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/1256—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids used as thickening agent
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
- C10M2207/1265—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic used as thickening agent
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
- C10M2207/1285—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof used as thickening agents
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2213/06—Perfluoro polymers
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2213/06—Perfluoro polymers
- C10M2213/062—Polytetrafluoroethylene [PTFE]
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
- C10M2215/064—Di- and triaryl amines
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/08—Amides
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/22—Heterocyclic nitrogen compounds
- C10M2215/221—Six-membered rings containing nitrogen and carbon only
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/22—Heterocyclic nitrogen compounds
- C10M2215/221—Six-membered rings containing nitrogen and carbon only
- C10M2215/222—Triazines
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- 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
- C10M2229/0405—Siloxanes with specific structure used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2010/00—Metal present as such or in compounds
- C10N2010/02—Groups 1 or 11
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/02—Bearings
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/10—Semi-solids; greasy
Definitions
- the invention relates to a grease composition that utilizes a metal soap-based thickener.
- Grease has been mainly used for slide bearings, rolling bearings, and sliding surfaces where it is difficult to maintain adhesion of a lubricant film due to the movement of the contact surface.
- Metal soap grease that utilizes a metal soap-based thickener exhibits excellent water resistance, heat resistance, and mechanical stability.
- lithium soap-based grease has been most widely used as universal grease, and has been used for bearings, gears, ball joints, pinions, and the like which have steel-resin sliding parts.
- a grease composition that includes silicone oil, a lithium soap thickener, 3 to 25 mass% of a polytetrafluoroethylene resin powder, and 1 to 15 mass% of a saturated fat acid amide has been proposed as resin grease used for steel-resin sliding parts (see PTL 1).
- the grease composition disclosed in PTL 1 utilizes silicone oil, namely a high-density base oil, the dispersibility of the solid lubricant is poor. Moreover, the friction coefficient cannot be sufficiently decreased, and a stick-slip phenomenon easily occurs.
- An object of the invention is to provide a grease composition that improves the dispersibility of a solid lubricant, that provides a sufficiently low friction coefficient in steel-resin sliding parts, and that prevents a stick-slip phenomenon.
- the inventors of the invention conducted extensive studies in order to achieve the above object. As a result, the inventors found that a grease composition that improves the dispersibility of a solid lubricant, that provides a sufficiently low friction coefficient in steel-resin sliding parts, and that prevents a stick-slip phenomenon can be obtained, by utilizing a lubricant base oil having a specific density.
- the invention was completed based on the above finding, and provides the following.
- the grease composition according to the invention ensures that the solid lubricant is sufficiently dispersed therein, provides a low friction coefficient in steel-resin sliding parts, and prevents a stick-slip phenomenon.
- the grease composition according to the invention comprises a lubricant base oil having a density of 0.75 to 0.95 g/cm 3 at 15°C, an amide compound, a solid lubricant, and a metal soap-based thickener.
- a mineral oil-based lubricant base oil or a synthetic lubricant base oil may be used as the lubricant base oil used in connection with the invention as long as the density is 0.75 to 0.95 g/cm 3 at 15°C. If the density of the lubricant base oil falls outside the above range, the dispersibility of the solid lubricant may decrease, and the friction coefficient may not be sufficiently decreased.
- the density of the lubricant base oil is more preferably 0.8 to 0.9 g/cm 3 .
- the lubricant base oil have a kinematic viscosity of 1 to 500 mm 2 /s at 40°C, and more preferably 5 to 100 mm 2 /s. If the kinematic viscosity of the lubricant base oil falls outside the range of 1 to 500 mm 2 /s at 40°C, it may be difficult to easily prepare a grease composition having the desired consistency. In order to prepare grease having excellent lubricity, it is preferable to use a lubricant base oil having a viscosity index of 90 or more in particular, 95 to 250, a pour point of -10°C or less in particular, -15 to -70°C, and a flash point of 150°C or more.
- Examples of the mineral oil-based lubricant base oil include lubricant fractions obtained by distilling crude oil under atmospheric pressure optionally followed by distillation under reduced pressure to obtain a distillate, and refining the distillate using various types of refining process.
- Examples of the refining process include hydrotreating, solvent extraction, solvent dewaxing, hydrodewaxing, washing with sulfuric acid, clay treatment, and the like.
- the base oil used in connection with the invention can be obtained by combining these processes in an appropriate order.
- a mixture of a plurality of refined oils having different properties is also useful, wherein the mixture is obtained by using different types of crude oils or distillates and by a different combination and/or order of processes.
- the base oil obtained by each method may preferably be used as long as the properties of the base oil are adjusted to satisfy the above density range.
- the synthetic lubricant base oil examples include polyolefins such as a poly- ⁇ -olefin, a polybutene, and a copolymer of two or more olefins, polyesters, polyalkylene glycols, alkylbenzenes, alkylnaphthalenes, and the like. It is preferable to use a poly- ⁇ -olefin from the viewpoint of availability, cost, viscosity, oxidation stability, and compatibility with a system member. A polymer of 1-dodecene or 1-decene is more preferable as the poly- ⁇ -olefin from the viewpoint of cost.
- synthetic lubricant base oils may be used either alone or in combination.
- the synthetic lubricant base oil may be used in combination with the mineral oil-based lubricant base oil.
- each base oil When using a mixture of a plurality of types of lubricant base oil including a synthetic lubricant base oil, the properties of each base oil are not necessary to fall within the above range as long as the base oil mixture satisfies the above properties. Therefore, each synthetic base oil need not necessarily satisfy the above properties, but it is preferable that the properties of each synthetic base oil fall within the above ranges.
- the content of the lubricant base oil in the grease composition is preferably 50 to 95 mass%, and more preferably 60 to 85 mass%, based on the total amount of the grease composition. If the content of the lubricant base oil is outside the range of 50 to 95 mass%, it may be difficult to easily prepare a grease composition having the desired consistency.
- the amide compound used in connection with the invention is a compound that includes at least one amide group (-NH-CO-).
- a compound that includes one amide group (monoamide), a compound that includes two amide groups (bisamide), and a compound that includes three amide groups (triamide) may be used as the amide compound.
- the bisamide and the triamide have an advantage in that the frictional resistance in the sliding part can be reduced even when the amide compound is used in a relatively small amount. Therefore, the bisamide and the triamide are most suitable as the amide compound.
- the bisamide may be an acid amide of a diamine or an acid amide of a diacid.
- an amide compound having a melting point of 40 to 180°C (more preferably 80 to 180°C, and still more preferably 100 to 170°C) and a molecular weight of 242 to 932 (more preferably 298 to 876).
- the monoamide is represented by the following general formula (1)
- the bisamide is represented by the following general formulas (2) and (3)
- the triamide is represented by the following general formula (4).
- R 1 -CO-NH-R 2 (1)
- R 1 -CO-NH-A 1 -NH-CO-R 2 (2)
- R 1 -NH-CO-A 1 -CO-NH-R 2 (3)
- R 1 , R 2 , and R 3 are independently a hydrocarbon group having 5 to 25 carbon atoms.
- the hydrocarbon group may be an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, or an aromatic hydrocarbon group.
- R 2 in the general formula (1) may be a hydrogen atom.
- a 1 , A 2 , and A 3 are independently an aliphatic hydrocarbon group having 1 to 10 carbon atoms, an alicyclic hydrocarbon group, an aromatic hydrocarbon group, or a divalent hydrocarbon group having 1 to 10 carbon atoms formed by combining these groups, and M is an amide group.
- R 2 is a hydrogen atom or a saturated or unsaturated chain hydrocarbon group having 10 to 20 carbon atoms when the amide compound is the monoamide.
- a 1 is a divalent saturated chain hydrocarbon group having 1 to 4 carbon atoms when the amide compound is the acid amide of a diamine.
- Some of the hydrogen atoms of the hydrocarbon group represented by R 1 , R 2 , or A 1 in the general formulas (2) and (3) may be substituted with a hydroxyl group (-OH).
- aliphatic amide An amide compound in which A 1 , A 2 , and A 3 are an aliphatic hydrocarbon group is referred herein to as "aliphatic amide", an amide compound in which at least one of A 1 , A 2 , and A 3 is an aromatic hydrocarbon group is referred herein to as “aromatic amide”, and an amide compound in which at least one of A 1 , A 2 , and A 3 is an alicyclic hydrocarbon group or an aromatic hydrocarbon group is referred herein to as "non-aliphatic amide”.
- R 1 , R 2 , and R 3 is a saturated or unsaturated chain hydrocarbon group having 10 to 20 carbon atoms when the amide compound is the aliphatic amide.
- R 1 , R 2 , and R 3 is a saturated or unsaturated chain hydrocarbon group having 10 to 20 carbon atoms or an aromatic hydrocarbon group when the amide compound is the aromatic amide.
- the non-aliphatic amide may also be used as the amide compound, but it is preferable to use the aliphatic amide as the amide compound. It is preferable that A 1 is a divalent saturated chain hydrocarbon group having 1 to 4 carbon atoms when the amide compound is the acid amide of a diamine (general formula (3)).
- the monoamide examples include saturated fatty acid amides such as lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, and hydroxystearic acid amide, unsaturated fatty acid amides such as oleic acid amide and erucic acid amide, substituted amides of a saturated or unsaturated long-chain fatty acid and a long-chain amine such as stearylstearic acid amide, oleyloleic acid amide, oleylstearic acid amide, and stearyloleic acid amide, and the like.
- saturated fatty acid amides such as lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, and hydroxystearic acid amide
- unsaturated fatty acid amides such as oleic acid amide and erucic acid amide
- the acid amide of a diamine represented by the general formula (2) include ethylene bis-stearic acid amide, ethylene bis-isostearic acid amide, ethylene bis-oleic acid amide, methylene bis-lauric acid amide, hexamethylene bis-oleic acid amide, hexamethylene bis-hydroxystearic acid amide, and the like.
- Specific examples of the bisamide of a diacid represented by the general formula (3) include N,N'-bis-stearylsebacic acid amide and the like.
- the amide compounds represented by the general formula (2) or (3) in which R 1 and R 2 are independently a saturated chain hydrocarbon group or an unsaturated chain hydrocarbon group having 12 to 20 carbon atoms are preferable.
- N-acylamino acid diamide compound there are various triamide compounds that are represented by the general formula (4).
- Specific examples of a compound among the compounds represented by the general formula (4) that can be suitably used in connection with the invention include an N-acylamino acid diamide compound.
- the N-acyl group included in the N-acylamino acid diamide compound is preferably a linear or branched saturated or unsaturated aliphatic acyl group having 1 to 30 carbon atoms, or an aromatic acyl group in particular, a caproyl group, a capryloyl group, a lauroyl group, a myristoyl group, or a stearoyl group.
- the amino acid included in the N-acylamino acid diamide compound is preferably aspartic acid or glutamic acid.
- the amine of the amide group included in the N-acylamino acid diamide compound is preferably a linear or branched saturated or unsaturated aliphatic amine having 1 to 30 carbon atoms, and more preferably butylamine, octylamine, laurylamine, isostearylamine, or stearylamine.
- N-lauroyl-L-glutamic acid- ⁇ , ⁇ -di-n-butylamide is preferable.
- the content of the amide compound in the grease composition is preferably 1 to 50 mass%, and more preferably 5 to 30 mass%, based on the total amount of the grease composition.
- the solid lubricant is not particularly limited as long as the solid lubricant is normally used as a lubricant. It is preferable to use a layered compound or a fluororesin as the solid lubricant due to excellent lubricity.
- layered compound refers to a compound having a layered crystal structure.
- melamine cyanulate molybdenum disulfide, boron nitride, graphite, mica, fluorinated graphite, and the like are preferable as the layered compound.
- Examples of a preferable fluororesin include a polytetrafluoroethylene (PTFE), a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), a tetrafluoroethylene-hexafluoropropylene copolymer (FEP), a tetrafluoroethylene-ethylene copolymer (ETFE), a polyvinylidene fluoride (PVDF), a polychlorotrifluoroethylene (PCTFE), and the like.
- PTFE polytetrafluoroethylene
- PFA tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer
- FEP tetrafluoroethylene-hexafluoropropylene copolymer
- ETFE tetrafluoroethylene-ethylene copolymer
- PVDF polyvinylidene fluoride
- PCTFE polychlorotrifluoroethylene
- solid lubricants may be used either alone or in combination.
- a solid lubricant having an appropriate particle size may be selected depending on the application. It is preferable to use a solid lubricant having a particle size (diameter) of 0.2 to 50 ⁇ m, and more preferably 1 to 10 ⁇ m.
- the content of the solid lubricant in the grease composition is preferably 0.1 to 10 mass%, and more preferably 0.2 to 5 mass%, based on the total amount of the grease composition.
- the metal soap-based thickener is a thickener that includes a metal carboxylate.
- the carboxylic acid may be a carboxylic acid derivative that includes a hydroxyl group or the like.
- the carboxylic acid may be either an aliphatic carboxylic acid such as stearic acid and azelaic acid or an aromatic carboxylic acid such as terephthalic acid.
- An aliphatic monocarboxylic acid or dicarboxylic acid in particular, an aliphatic carboxylic acid having 6 to 20 carbon atoms may be used. It is preferable to use an aliphatic monocarboxylic acid having 12 to 20 carbon atoms or an aliphatic dicarboxylic acid having 6 to 14 carbon atoms.
- An aliphatic monocarboxylic acid that includes one hydroxyl group is preferable.
- the metal may be an alkali metal such as lithium and sodium, an alkaline-earth metal such as calcium, or an amphoteric metal such as aluminum.
- An alkali metal in particular, lithium is preferably used.
- the thickener may be added in the form of metal soap.
- the carboxylic acid and a metal source e.g., metal salt and metal salt hydroxide
- metal salt and metal salt hydroxide may also be separately added and reacted to produce a metal soap thickener, when preparing grease.
- Such metal carboxylates may be used either alone or in combination.
- the content of the metal soap-based thickener in the grease composition may be appropriately determined as long as the desired consistency can be obtained.
- the content of the metal soap-based thickener in the grease composition is preferably 2 to 30 mass%, and more preferably 5 to 15 mass%, based on the total amount of the grease composition.
- the grease composition according to the invention may optionally include a detergent, a dispersant, an antiwear agent, a viscosity index improver, an antioxidant, an extreme pressure agent, a rust-preventive agent, a corrosion inhibitor, and the like that are normally used for a lubricant or grease in addition to the above components.
- the grease composition according to the invention may be prepared using a normal grease preparation method. It is preferable to heat a mixture comprising the amide compound to a temperature equal to or higher than the melting point of the amide compound at least once, after mixing the amide compound.
- the grease composition may be prepared by heating the amide compound and the lubricant base oil to a temperature equal to or higher than the melting point of the amide compound, cooling the mixture, and then physically mixing the cooled mixture with normal grease that comprises the solid lubricant, the thickener, and the lubricant base oil.
- all of the components including the thickener may be mixed, heated to a temperature equal to or higher than the melting point of the amide compound, and then cooled.
- the grease composition according to the invention may suitably be used for lubrication between various resin sliding members and various metal sliding members.
- the resin sliding member include sliding members formed of a nylon resin, a polycarbonate (PC) resin, a polybutylene terephthalate (PBT) resin, a polyacetal (POM) resin, and the like having a long-term heat resistant temperature (UL standard) of 50 to 150°C.
- the grease composition is suitable for a member where a nylon 6 (PA6) resin is used.
- PA6 nylon 6
- the metal sliding member include sliding members formed of bearing steel, carbon steel, stainless steel (SUS), and the like.
- the grease composition is suitable for a member where bearing steel SUJ-2 is used.
- the average particle size was measured by laser diffractometry.
- Diphenylamine was added to each composition as an antioxidant.
- Each component was charged into a vessel in the amount (mass%) shown in Table 1 or 2, heated to 150°C, which is a temperature equal to or higher than the melting point of the amide, stirred using a magnetic stirrer, and then cooled to room temperature.
- the mixture was dispersed under pressure using a roller (triple roll) to prepare a grease composition.
- An evaluation test was performed using a reciprocating friction tester utilizing a ball and a disk.
- a sphere made of SUJ-2 and having a diameter of 1/4 inches was used as a metal sliding member, and a plate made of nylon 6 ("N6 (NC)" manufactured by Toray Plastics Precision Co., Ltd.) was used as a resin sliding member.
- N6 (NC) manufactured by Toray Plastics Precision Co., Ltd.
- the test load was set to 2000 gf, the sliding speed was set to 10 mm/s, and the amplitude was set to 20 mm.
- the grease was applied to the disk, and the presence or absence of a stick-slip phenomenon was evaluated from the friction coefficient and the frictional force waveform during sliding. Specifically, it was determined that a stick-slip phenomenon occurred when the frictional force during sliding in one direction was not constant.
- the grease composition according to the invention ensures that the solid lubricant is sufficiently dispersed therein, provides a low friction coefficient in steel-resin sliding parts, and prevents a stick-slip phenomenon, the grease composition is useful for lubrication between a resin sliding member and a metal sliding member (e.g., bearing, gear, ball joint, and pinion).
- a resin sliding member e.g., bearing, gear, ball joint, and pinion
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
Abstract
Description
- The invention relates to a grease composition that utilizes a metal soap-based thickener.
- Grease has been mainly used for slide bearings, rolling bearings, and sliding surfaces where it is difficult to maintain adhesion of a lubricant film due to the movement of the contact surface. Metal soap grease that utilizes a metal soap-based thickener exhibits excellent water resistance, heat resistance, and mechanical stability. In particular, lithium soap-based grease has been most widely used as universal grease, and has been used for bearings, gears, ball joints, pinions, and the like which have steel-resin sliding parts.
- A grease composition that includes silicone oil, a lithium soap thickener, 3 to 25 mass% of a polytetrafluoroethylene resin powder, and 1 to 15 mass% of a saturated fat acid amide has been proposed as resin grease used for steel-resin sliding parts (see PTL 1).
- However, since the grease composition disclosed in PTL 1 utilizes silicone oil, namely a high-density base oil, the dispersibility of the solid lubricant is poor. Moreover, the friction coefficient cannot be sufficiently decreased, and a stick-slip phenomenon easily occurs.
- PTL1:
JP-A-2011-225781 - An object of the invention is to provide a grease composition that improves the dispersibility of a solid lubricant, that provides a sufficiently low friction coefficient in steel-resin sliding parts, and that prevents a stick-slip phenomenon.
- The inventors of the invention conducted extensive studies in order to achieve the above object. As a result, the inventors found that a grease composition that improves the dispersibility of a solid lubricant, that provides a sufficiently low friction coefficient in steel-resin sliding parts, and that prevents a stick-slip phenomenon can be obtained, by utilizing a lubricant base oil having a specific density.
- The invention was completed based on the above finding, and provides the following.
-
- (1) A grease composition comprising a lubricant base oil having a density of 0.75 to 0.95 g/cm3 at 15°C, an amide compound, a solid lubricant, and a metal soap-based thickener.
- (2) The grease composition according to (1), wherein the solid lubricant is a layered compound or a fluororesin.
- (3) The grease composition according to (1) or (2), wherein the amide compound is a monoamide or a bisamide.
- The grease composition according to the invention ensures that the solid lubricant is sufficiently dispersed therein, provides a low friction coefficient in steel-resin sliding parts, and prevents a stick-slip phenomenon.
- The grease composition according to the invention comprises a lubricant base oil having a density of 0.75 to 0.95 g/cm3 at 15°C, an amide compound, a solid lubricant, and a metal soap-based thickener.
- A mineral oil-based lubricant base oil or a synthetic lubricant base oil may be used as the lubricant base oil used in connection with the invention as long as the density is 0.75 to 0.95 g/cm3 at 15°C. If the density of the lubricant base oil falls outside the above range, the dispersibility of the solid lubricant may decrease, and the friction coefficient may not be sufficiently decreased. The density of the lubricant base oil is more preferably 0.8 to 0.9 g/cm3.
- It is preferable that the lubricant base oil have a kinematic viscosity of 1 to 500 mm2/s at 40°C, and more preferably 5 to 100 mm2/s. If the kinematic viscosity of the lubricant base oil falls outside the range of 1 to 500 mm2/s at 40°C, it may be difficult to easily prepare a grease composition having the desired consistency. In order to prepare grease having excellent lubricity, it is preferable to use a lubricant base oil having a viscosity index of 90 or more in particular, 95 to 250, a pour point of -10°C or less in particular, -15 to -70°C, and a flash point of 150°C or more.
- Examples of the mineral oil-based lubricant base oil include lubricant fractions obtained by distilling crude oil under atmospheric pressure optionally followed by distillation under reduced pressure to obtain a distillate, and refining the distillate using various types of refining process. Examples of the refining process include hydrotreating, solvent extraction, solvent dewaxing, hydrodewaxing, washing with sulfuric acid, clay treatment, and the like. The base oil used in connection with the invention can be obtained by combining these processes in an appropriate order. A mixture of a plurality of refined oils having different properties is also useful, wherein the mixture is obtained by using different types of crude oils or distillates and by a different combination and/or order of processes. The base oil obtained by each method may preferably be used as long as the properties of the base oil are adjusted to satisfy the above density range.
- It is preferable to use a material that exhibits excellent hydrolytic stability as the synthetic lubricant base oil. Examples of the synthetic lubricant base oil include polyolefins such as a poly-α-olefin, a polybutene, and a copolymer of two or more olefins, polyesters, polyalkylene glycols, alkylbenzenes, alkylnaphthalenes, and the like. It is preferable to use a poly-α-olefin from the viewpoint of availability, cost, viscosity, oxidation stability, and compatibility with a system member. A polymer of 1-dodecene or 1-decene is more preferable as the poly-α-olefin from the viewpoint of cost.
- These synthetic lubricant base oils may be used either alone or in combination. The synthetic lubricant base oil may be used in combination with the mineral oil-based lubricant base oil.
- When using a mixture of a plurality of types of lubricant base oil including a synthetic lubricant base oil, the properties of each base oil are not necessary to fall within the above range as long as the base oil mixture satisfies the above properties. Therefore, each synthetic base oil need not necessarily satisfy the above properties, but it is preferable that the properties of each synthetic base oil fall within the above ranges.
- The content of the lubricant base oil in the grease composition is preferably 50 to 95 mass%, and more preferably 60 to 85 mass%, based on the total amount of the grease composition. If the content of the lubricant base oil is outside the range of 50 to 95 mass%, it may be difficult to easily prepare a grease composition having the desired consistency.
- The amide compound used in connection with the invention is a compound that includes at least one amide group (-NH-CO-). A compound that includes one amide group (monoamide), a compound that includes two amide groups (bisamide), and a compound that includes three amide groups (triamide) may be used as the amide compound. The bisamide and the triamide have an advantage in that the frictional resistance in the sliding part can be reduced even when the amide compound is used in a relatively small amount. Therefore, the bisamide and the triamide are most suitable as the amide compound.
- The bisamide may be an acid amide of a diamine or an acid amide of a diacid.
- It is preferable to use an amide compound having a melting point of 40 to 180°C (more preferably 80 to 180°C, and still more preferably 100 to 170°C) and a molecular weight of 242 to 932 (more preferably 298 to 876).
- The monoamide is represented by the following general formula (1), the bisamide is represented by the following general formulas (2) and (3), and the triamide is represented by the following general formula (4).
R1-CO-NH-R2 (1)
R1-CO-NH-A1-NH-CO-R2 (2)
R1-NH-CO-A1-CO-NH-R2 (3)
R1-M-A1-CH(A2-M-R3)-A3-M-R2 (4)
wherein R1, R2, and R3 are independently a hydrocarbon group having 5 to 25 carbon atoms. The hydrocarbon group may be an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, or an aromatic hydrocarbon group. R2 in the general formula (1) may be a hydrogen atom. A1, A2, and A3 are independently an aliphatic hydrocarbon group having 1 to 10 carbon atoms, an alicyclic hydrocarbon group, an aromatic hydrocarbon group, or a divalent hydrocarbon group having 1 to 10 carbon atoms formed by combining these groups, and M is an amide group. - It is preferable that R2 is a hydrogen atom or a saturated or unsaturated chain hydrocarbon group having 10 to 20 carbon atoms when the amide compound is the monoamide.
- It is preferable that A1 is a divalent saturated chain hydrocarbon group having 1 to 4 carbon atoms when the amide compound is the acid amide of a diamine.
- Some of the hydrogen atoms of the hydrocarbon group represented by R1, R2, or A1 in the general formulas (2) and (3) may be substituted with a hydroxyl group (-OH).
- An amide compound in which A1, A2, and A3 are an aliphatic hydrocarbon group is referred herein to as "aliphatic amide", an amide compound in which at least one of A1, A2, and A3 is an aromatic hydrocarbon group is referred herein to as "aromatic amide", and an amide compound in which at least one of A1, A2, and A3 is an alicyclic hydrocarbon group or an aromatic hydrocarbon group is referred herein to as "non-aliphatic amide".
- It is preferable that R1, R2, and R3 is a saturated or unsaturated chain hydrocarbon group having 10 to 20 carbon atoms when the amide compound is the aliphatic amide.
- It is preferable that R1, R2, and R3 is a saturated or unsaturated chain hydrocarbon group having 10 to 20 carbon atoms or an aromatic hydrocarbon group when the amide compound is the aromatic amide.
- The non-aliphatic amide may also be used as the amide compound, but it is preferable to use the aliphatic amide as the amide compound. It is preferable that A1 is a divalent saturated chain hydrocarbon group having 1 to 4 carbon atoms when the amide compound is the acid amide of a diamine (general formula (3)).
- Specific examples of the monoamide include saturated fatty acid amides such as lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, and hydroxystearic acid amide, unsaturated fatty acid amides such as oleic acid amide and erucic acid amide, substituted amides of a saturated or unsaturated long-chain fatty acid and a long-chain amine such as stearylstearic acid amide, oleyloleic acid amide, oleylstearic acid amide, and stearyloleic acid amide, and the like.
- Specific examples of the acid amide of a diamine represented by the general formula (2) include ethylene bis-stearic acid amide, ethylene bis-isostearic acid amide, ethylene bis-oleic acid amide, methylene bis-lauric acid amide, hexamethylene bis-oleic acid amide, hexamethylene bis-hydroxystearic acid amide, and the like. Specific examples of the bisamide of a diacid represented by the general formula (3) include N,N'-bis-stearylsebacic acid amide and the like.
- Among these, the amide compounds represented by the general formula (2) or (3) in which R1 and R2 are independently a saturated chain hydrocarbon group or an unsaturated chain hydrocarbon group having 12 to 20 carbon atoms are preferable.
- There are various triamide compounds that are represented by the general formula (4). Specific examples of a compound among the compounds represented by the general formula (4) that can be suitably used in connection with the invention include an N-acylamino acid diamide compound. The N-acyl group included in the N-acylamino acid diamide compound is preferably a linear or branched saturated or unsaturated aliphatic acyl group having 1 to 30 carbon atoms, or an aromatic acyl group in particular, a caproyl group, a capryloyl group, a lauroyl group, a myristoyl group, or a stearoyl group. The amino acid included in the N-acylamino acid diamide compound is preferably aspartic acid or glutamic acid. The amine of the amide group included in the N-acylamino acid diamide compound is preferably a linear or branched saturated or unsaturated aliphatic amine having 1 to 30 carbon atoms, and more preferably butylamine, octylamine, laurylamine, isostearylamine, or stearylamine. In particular, N-lauroyl-L-glutamic acid-α,γ-di-n-butylamide is preferable.
- These amide compounds may be used either alone or in combination. The content of the amide compound in the grease composition is preferably 1 to 50 mass%, and more preferably 5 to 30 mass%, based on the total amount of the grease composition.
- When the amide compound is heated and melted in the presence of the lubricant base oil, the lubricant base oil is held by the amide compound that forms a three-dimensional network structure. Therefore, the friction coefficient in steel-resin sliding parts further decreases, in comparison with the case of merely dispersing and mixing the amide compound in grease. Moreover, a stick-slip phenomenon does not occur.
- The solid lubricant is not particularly limited as long as the solid lubricant is normally used as a lubricant. It is preferable to use a layered compound or a fluororesin as the solid lubricant due to excellent lubricity.
- The term "layered compound" used herein refers to a compound having a layered crystal structure. For example, melamine cyanulate, molybdenum disulfide, boron nitride, graphite, mica, fluorinated graphite, and the like are preferable as the layered compound.
- Examples of a preferable fluororesin include a polytetrafluoroethylene (PTFE), a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), a tetrafluoroethylene-hexafluoropropylene copolymer (FEP), a tetrafluoroethylene-ethylene copolymer (ETFE), a polyvinylidene fluoride (PVDF), a polychlorotrifluoroethylene (PCTFE), and the like.
- These solid lubricants may be used either alone or in combination. A solid lubricant having an appropriate particle size may be selected depending on the application. It is preferable to use a solid lubricant having a particle size (diameter) of 0.2 to 50 µm, and more preferably 1 to 10 µm.
- The content of the solid lubricant in the grease composition is preferably 0.1 to 10 mass%, and more preferably 0.2 to 5 mass%, based on the total amount of the grease composition.
- The metal soap-based thickener is a thickener that includes a metal carboxylate. The carboxylic acid may be a carboxylic acid derivative that includes a hydroxyl group or the like.
- The carboxylic acid may be either an aliphatic carboxylic acid such as stearic acid and azelaic acid or an aromatic carboxylic acid such as terephthalic acid. An aliphatic monocarboxylic acid or dicarboxylic acid in particular, an aliphatic carboxylic acid having 6 to 20 carbon atoms may be used. It is preferable to use an aliphatic monocarboxylic acid having 12 to 20 carbon atoms or an aliphatic dicarboxylic acid having 6 to 14 carbon atoms. An aliphatic monocarboxylic acid that includes one hydroxyl group is preferable.
- The metal may be an alkali metal such as lithium and sodium, an alkaline-earth metal such as calcium, or an amphoteric metal such as aluminum. An alkali metal in particular, lithium is preferably used.
- The thickener may be added in the form of metal soap. The carboxylic acid and a metal source (e.g., metal salt and metal salt hydroxide) may also be separately added and reacted to produce a metal soap thickener, when preparing grease.
- Such metal carboxylates may be used either alone or in combination. For example, it is particularly preferable to use a mixture of lithium 12-hydroxystearate and lithium azelate.
- The content of the metal soap-based thickener in the grease composition may be appropriately determined as long as the desired consistency can be obtained. For example, the content of the metal soap-based thickener in the grease composition is preferably 2 to 30 mass%, and more preferably 5 to 15 mass%, based on the total amount of the grease composition.
- The grease composition according to the invention may optionally include a detergent, a dispersant, an antiwear agent, a viscosity index improver, an antioxidant, an extreme pressure agent, a rust-preventive agent, a corrosion inhibitor, and the like that are normally used for a lubricant or grease in addition to the above components.
- The grease composition according to the invention may be prepared using a normal grease preparation method. It is preferable to heat a mixture comprising the amide compound to a temperature equal to or higher than the melting point of the amide compound at least once, after mixing the amide compound.
- Specifically, the grease composition may be prepared by heating the amide compound and the lubricant base oil to a temperature equal to or higher than the melting point of the amide compound, cooling the mixture, and then physically mixing the cooled mixture with normal grease that comprises the solid lubricant, the thickener, and the lubricant base oil. Alternatively, all of the components including the thickener may be mixed, heated to a temperature equal to or higher than the melting point of the amide compound, and then cooled.
- The grease composition according to the invention may suitably be used for lubrication between various resin sliding members and various metal sliding members. Examples of the resin sliding member include sliding members formed of a nylon resin, a polycarbonate (PC) resin, a polybutylene terephthalate (PBT) resin, a polyacetal (POM) resin, and the like having a long-term heat resistant temperature (UL standard) of 50 to 150°C. In particular, the grease composition is suitable for a member where a nylon 6 (PA6) resin is used. Examples of the metal sliding member include sliding members formed of bearing steel, carbon steel, stainless steel (SUS), and the like. In particular, the grease composition is suitable for a member where bearing steel SUJ-2 is used.
- - Lubricant base oil obtained by distilling atmospheric distillation residue under reduced pressure and subjecting the resulting distillate to solvent refining
Kinematic viscosity at 40°C: 68 mm2/s
Density at 15°C: 0.87 g/cm3
Viscosity index: 100
Pour point: -10°C
Flash point: 250°C - Kinematic viscosity at 40°C: 68 mm2/s
Density at 15°C: 0.83 g/cm3
Viscosity index: 133
Pour point: -45°C
Flash point: 250°C - Kinematic viscosity at 40°C: 68 mm2/s
Density at 15°C: 0.96 g/cm3 - Kinematic viscosity at 40°C: 85 mm2/s
Density at 15°C: 1.83 g/cm3 -
- (1) Aliphatic amide
- (a) Ethylene bis-stearic acid amide (special grade reagent)
- (b) Ethylene bis-oleic acid amide (special grade reagent)
- (c) Stearic acid monoamide (special grade reagent)
- (2) Aromatic amide
- (a) m-Xylylene bis-stearic acid amide (special grade reagent)
-
- (1) Melamine cyanulate (MCA, average particle size: 4 µm, "MELAPUR MC25" manufactured by BASF)
- (2) Molybdenum disulfide (average particle size: 0.5 µm, "Nichimoly M-5 Powder" manufactured by Daizo Corporation)
- (3) Polytetrafluoroethylene (PTFE, average particle size: 4 µm, "KTL-8N" manufactured by Kitamura Limited)
- (4) Boron nitride (average particle size: 2 µm, "HP-P1" manufactured by Mizushima Ferroalloy Co., Ltd.)
- (5) Silicon oxide (average particle size: 35 µm, special grade reagent)
- The average particle size was measured by laser diffractometry.
-
- (1) Lithium 12-hydroxystearate ("Lithium stearate" in Tables 1 and 2)
- (2) Mixture of lithium 12-hydroxystearate and lithium azelate (mixing ratio: 2:1) ("Lithium soap mixture" in Tables 1 and 2)
- Diphenylamine was added to each composition as an antioxidant.
- Each component was charged into a vessel in the amount (mass%) shown in Table 1 or 2, heated to 150°C, which is a temperature equal to or higher than the melting point of the amide, stirred using a magnetic stirrer, and then cooled to room temperature. The mixture was dispersed under pressure using a roller (triple roll) to prepare a grease composition.
- An evaluation test was performed using a reciprocating friction tester utilizing a ball and a disk. A sphere made of SUJ-2 and having a diameter of 1/4 inches was used as a metal sliding member, and a plate made of nylon 6 ("N6 (NC)" manufactured by Toray Plastics Precision Co., Ltd.) was used as a resin sliding member.
- The test load was set to 2000 gf, the sliding speed was set to 10 mm/s, and the amplitude was set to 20 mm. The grease was applied to the disk, and the presence or absence of a stick-slip phenomenon was evaluated from the friction coefficient and the frictional force waveform during sliding. Specifically, it was determined that a stick-slip phenomenon occurred when the frictional force during sliding in one direction was not constant.
- When only the mineral oil and the lithium soap-based thickener were mixed, the friction coefficient was high, and a stick-slip phenomenon occurred (Comparative Example 7).
- When only the mineral oil, the lithium soap-based thickener, and the solid lubricant were mixed, the friction coefficient slightly decreased, and a stick-slip phenomenon was somewhat suppressed insufficiently (Comparative Examples 1 to 6).
- When the mineral oil, the lithium soap-based thickener, the solid lubricant, and the aliphatic amide were mixed, the friction coefficient further decreased, and a stick-slip phenomenon was suppressed (Examples 1 to 12).
- When using the silicone oil or the fluorinated oil as the base oil, the melted amide compound and the base oil were separated into two phases and failed to form uniform dissolution even when the mixture was heated to a temperature equal to or higher than the melting point of the amide compound (Comparative Examples 8 and 9). Therefore, silicon oxide was added to the silicone oil, and polytetrafluoroethylene was added to the fluorinated oil. However, since a heterogeneous mixture was obtained, the friction test could not be performed (Comparative Examples 10 and 11).
[Table 1] Example 1 2 3 4 5 6 7 8 9 10 11 12 13 Lubricant base oil Mineral oil 75 75 75 75 75 75 73 70 80 78 80.5 75 Poly-α-olefin 75 Amide compound Stearic acid monoamide 15 Stearic acid bisamide 15 15 15 15 15 15 20 10 10 10 Oleic acid bisamide 15 Aromatic amide 15 Solid lubricant MCA 1 RTFE 1 Boron nitride 1 1 1 1 1 1 1 3 0.5 1 Molybdenum disulfide 1 Thickener Lithium stearate 8 8 8 8 8 8 8 8 8 8 8 8 Lithium soap mixture 10 Antioxidant Diphenylamine 1 1 1 1 1 1 1 1 1 1 1 1 1 Evaluation results Resin-steel BOD friction coefficient 0.050 0.055 0.053 0.055 0.050 0.054 0.050 0.048 0.045 0.055 0.052 0.053 0.055 Resin-steel stick-slip ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ [Table 2] Comparative Example 1 2 3 4 5 6 7 8 9 10 11 Lubricant base oil Mineral oil 88 83 88 88 88 86 89 Silicone oil 83 75 Fluorinated oil 83 75 Amide compound Stearic acid monoamide Stearic acid bisamide 15 15 15 15 Oleic acid bisamide Solid lubricant M C A 1 P T F E 1 8 Boron nitride 1 1 3 1 1 1 1 Molybdenum disulfide 1 Silicon oxide 8 Thickener Lithium stearate 10 10 10 10 10 10 Lithium soap mixture 15 Antioxidant Diphenylamine 1 1 1 1 1 1 1 1 1 1 1 Evaluation results Resin-steel BOD friction coefficient 0.070 0.075 0.070 0.072 0.075 0.070 0.080 impossible impossible impossible impossible Resin-steel stick-slip Δ Δ × Δ Δ Δ × impossible impossible impossible impossible - Since the grease composition according to the invention ensures that the solid lubricant is sufficiently dispersed therein, provides a low friction coefficient in steel-resin sliding parts, and prevents a stick-slip phenomenon, the grease composition is useful for lubrication between a resin sliding member and a metal sliding member (e.g., bearing, gear, ball joint, and pinion).
Claims (3)
- A grease composition comprising a lubricant base oil having a density of 0.75 to 0.95 g/cm3 at 15°C, an amide compound, a solid lubricant, and a metal soap-based thickener.
- The grease composition according to claim 1, wherein the solid lubricant is a layered compound or a fluororesin.
- The grease composition according to claim 1, wherein the amide compound is a monoamide or a bisamide.
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JP2012047664A JP5931509B2 (en) | 2012-03-05 | 2012-03-05 | Grease composition |
PCT/JP2013/055623 WO2013133148A1 (en) | 2012-03-05 | 2013-03-01 | Grease composition |
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EP (1) | EP2824166B1 (en) |
JP (1) | JP5931509B2 (en) |
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CN (1) | CN104145011A (en) |
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Cited By (2)
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EP4186966A1 (en) * | 2021-11-24 | 2023-05-31 | Klüber Lubrication München SE & Co. KG | High temperature lubricant grease |
WO2023094322A1 (en) * | 2021-11-24 | 2023-06-01 | Klueber Lubrication Muenchen Se & Co. Kg | High-temperature grease |
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JP6454541B2 (en) * | 2014-12-25 | 2019-01-16 | 株式会社日立製作所 | Lubricant for gas insulated switchgear and gas insulated switchgear |
EP3269794B1 (en) * | 2015-03-09 | 2021-07-28 | JXTG Nippon Oil & Energy Corporation | Grease composition |
JP6702761B2 (en) * | 2016-02-26 | 2020-06-03 | 協同油脂株式会社 | Grease composition for ball joints |
JP6753699B2 (en) * | 2016-05-27 | 2020-09-09 | ミネベアミツミ株式会社 | Rolling bearing |
US10774286B2 (en) | 2017-12-29 | 2020-09-15 | Exxonmobil Research And Engineering Company | Grease compositions with improved performance and methods of preparing and using the same |
US11254892B2 (en) | 2018-01-31 | 2022-02-22 | Idemitsu Kosan Co., Ltd. | Grease composition |
TW202021811A (en) * | 2018-12-14 | 2020-06-16 | 美商陶氏全球科技有限責任公司 | Multilayer films and laminates containing slip agents |
CN116218582A (en) * | 2023-01-05 | 2023-06-06 | 中国石油化工股份有限公司 | Worm gear lubricating grease composition for EPS steering gear of automobile and application thereof |
DE102023112511B3 (en) | 2023-05-11 | 2024-03-14 | Tunap Gmbh & Co. Kg | Solid lubricant composition and its use, method for lubricating a chain |
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JPS58154800A (en) * | 1982-03-10 | 1983-09-14 | Hitachi Ltd | Lubricant for preventing electrolytic corrosion and bearing device using same |
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JP2003003186A (en) * | 2001-06-20 | 2003-01-08 | Dow Corning Asia Ltd | POLY-alpha-OLEFIN GREASE COMPOSITION |
JP4199109B2 (en) * | 2001-07-09 | 2008-12-17 | 新日本石油株式会社 | Lubricant composition for ball joint and ball joint |
JP4532799B2 (en) * | 2001-09-27 | 2010-08-25 | Ntn株式会社 | Grease composition and grease-filled bearing |
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KR101243600B1 (en) * | 2004-10-20 | 2013-03-20 | 제이엑스 닛코닛세키에너지주식회사 | Heat reversible gel-like lubricating composition, process for producing the same, and bearing lubricant and bearing system using said compositiom |
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CN101405375B (en) * | 2006-03-24 | 2012-11-07 | 日本能源株式会社 | Semi-solid lubricant composition for transmission element and mechanical system provided with the same |
JP5259962B2 (en) * | 2007-02-26 | 2013-08-07 | 協同油脂株式会社 | Grease composition for resin lubrication and reduction device |
JP5273699B2 (en) * | 2007-03-22 | 2013-08-28 | Jx日鉱日石エネルギー株式会社 | Lubricant composition and lubrication system using the same |
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JP5188248B2 (en) * | 2008-04-11 | 2013-04-24 | 出光興産株式会社 | Grease composition and linear motion apparatus using the grease composition |
WO2010079743A1 (en) * | 2009-01-09 | 2010-07-15 | 株式会社ジャパンエナジー | Lubricant composition and lubricating liquid composition |
FR2942627B1 (en) * | 2009-02-27 | 2011-05-06 | Total Raffinage Marketing | FAT COMPOSITION |
JP5540531B2 (en) * | 2009-03-06 | 2014-07-02 | 日本精工株式会社 | Grease composition and rolling bearing |
JP5481158B2 (en) * | 2009-10-27 | 2014-04-23 | Jx日鉱日石エネルギー株式会社 | Extreme pressure lubricant composition |
JP5627921B2 (en) * | 2010-04-22 | 2014-11-19 | コスモ石油ルブリカンツ株式会社 | Grease composition for resin |
-
2012
- 2012-03-05 JP JP2012047664A patent/JP5931509B2/en active Active
-
2013
- 2013-03-01 WO PCT/JP2013/055623 patent/WO2013133148A1/en active Application Filing
- 2013-03-01 KR KR1020147027506A patent/KR102051689B1/en active IP Right Grant
- 2013-03-01 SG SG11201404820RA patent/SG11201404820RA/en unknown
- 2013-03-01 CN CN201380012539.2A patent/CN104145011A/en active Pending
- 2013-03-01 EP EP13757011.5A patent/EP2824166B1/en active Active
- 2013-03-01 US US14/382,846 patent/US20150024980A1/en not_active Abandoned
Cited By (3)
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EP4186966A1 (en) * | 2021-11-24 | 2023-05-31 | Klüber Lubrication München SE & Co. KG | High temperature lubricant grease |
WO2023094322A1 (en) * | 2021-11-24 | 2023-06-01 | Klueber Lubrication Muenchen Se & Co. Kg | High-temperature grease |
WO2023094321A1 (en) * | 2021-11-24 | 2023-06-01 | Klueber Lubrication Muenchen Se & Co. Kg | High-temperature grease |
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US20150024980A1 (en) | 2015-01-22 |
WO2013133148A1 (en) | 2013-09-12 |
KR20140129351A (en) | 2014-11-06 |
CN104145011A (en) | 2014-11-12 |
EP2824166B1 (en) | 2020-05-06 |
JP5931509B2 (en) | 2016-06-08 |
KR102051689B1 (en) | 2019-12-03 |
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SG11201404820RA (en) | 2014-11-27 |
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