Grease composition

a technology of composition and grease, which is applied in the field of grease composition, can solve the problems of insufficient reduction of friction coefficient, poor dispersion of solid lubricant, and difficulty in maintaining adhesion of lubricant film, and achieve the effect of preventing stick-slip phenomenon and low friction coefficien

Inactive Publication Date: 2015-01-22
JX NIPPON OIL & ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]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.

Problems solved by technology

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.
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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

1. Lubricant Base Oil

[0050](1) Mineral oil-based lubricant base oil

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.

(2) Synthetic lubricant base oil

(a) Poly-α-olefin (“Durasyn 170” manufactured by INEOS)

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.

(b) Polydimethylsiloxane (silicone oil; “KF-96” manufactured by Shin-Etsu

Chemical Co., Ltd., 50 cs, 100 cs)

[0051]Kinematic viscosity at 40° C.: 68 mm2 / s

Density at 15° C.: 0.96 g / cm3

(c) Linear perfluoro polyether (fluorinated oil; “FOMBLIN M15” manufactured by Solvay Solexis)

Kinematic viscosity at 40° C.: 85 mm2 / s

Density at 15° C.: 1.83 g / cm3

2. Amide Compound

[0052](1) Aliphatic amide

(a) Ethylene bis-stearic acid amide (specia...

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Abstract

Provided is 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 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, wherein the solid lubricant is preferably a layered compound or a fluororesin, and wherein the amide compound is preferably a monoamide or a bisamide.

Description

TECHNICAL FIELD[0001]The invention relates to a grease composition that utilizes a metal soap-based thickener.BACKGROUND ART[0002]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.[0003]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).[0004]However, since the grease composition disclosed in PTL 1 u...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M169/06
CPCC10M169/06C10N2230/06C10M2229/0405C10M2215/221C10M169/00C10N2240/02C10M2201/087C10N2250/10C10M2205/0285C10M2213/062C10M2201/066C10M2201/105C10M2207/1256C10M2203/1006C10M2213/06C10M2207/1285C10M2207/1265C10N2210/01C10M2215/08C10M2215/064C10M2215/222C10N2010/02C10N2030/06C10N2040/02C10N2050/10
Inventor ARAI, TAKASHISAKAI, KAZUMISHITARA, YUJI
Owner JX NIPPON OIL & ENERGY CORP
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