Grease composition

A technology of grease composition and synthetic hydrocarbon oil, which is applied in the direction of lubricating composition, thickener, base material, etc., can solve the problems of low torque, bearing leakage, large consistency change, etc., achieve excellent evaporation resistance, prevent Excellent rust resistance and excellent low torque performance

Active Publication Date: 2015-04-08
KYODO YUSHI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] As mentioned above, in order to ensure low torque performance, it is necessary to reduce the amount of the thickener, which is the main cause of the stirring resistance of the grease, as much as possible. When the consistency changes greatly and the grease softens, it leaks from the bearing to the outside

Method used

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Examples

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Embodiment

[0059] test grease

[0060] Using the (A) base oil shown in Table 1, the (B) thickener shown in Table 2, and the (C) rust inhibitor shown in Table 3, the examples and comparative examples with the compounding amounts shown in Table 4 were prepared grease composition. Specifically, diphenylmethane diisocyanate and a predetermined amine are reacted in a base oil, diluted with the base oil so that the mixed consistency (test method JIS K2220 7.) is 240 to 280, and additives are added thereto to prepare Grease compositions of Examples and Comparative Examples. In addition, the kinematic viscosity of the base oil at 40° C. was measured in accordance with JIS K2220 23.

[0061] Table 1

[0062] (A) base oil

[0063]

[0064] Synthetic hydrocarbon oil A: Kinematic viscosity at 40°C is 70.2mm 2 / s, poly-α-olefin with a pour point of -55°C

[0065] Synthetic hydrocarbon oil B: kinematic viscosity at 40°C is 395mm 2 / s, poly-α-olefin with a pour point of -35°C

[0066] Minera...

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Abstract

The invention provides a grease composition which contains (A) a base oil including a synthetic hydrocarbon oil and a highly purified mineral oil with a pour point of -35°C or less at a ratio by mass of 100:0 to 30:70; (B) a thickener represented by the following formula (1): R 1 -NHCONH-R 2 -NHCONH-R 3 (wherein R 2 is a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms, and R 1 and R 3 , which may be the same or different represent cyclohexyl group or a straight-chain or branched alkyl group having 8 to 18 carbon atoms), with [((the number of moles of the alkyl groups) / (the number of moles of the alkyl groups + the number of moles of the cyclohexyl groups)) x 100] being 30 to 100%; and (C) an alkenylsuccinic anhydride and / or organic zinc sulfonate. The grease composition of the invention can exhibit low torque performance and excellent rust preventing properties.

Description

technical field [0001] The present invention relates to a lubricating grease composition for rolling bearings used in electric equipment or auxiliary equipment of automobiles. Background technique [0002] Diurea grease is often used as a grease for rolling bearings used in electrical equipment or auxiliary machinery of automobiles, mainly from the viewpoint of heat resistance. Among diurea greases, aromatic diureas are often used especially because of high-temperature durability. [0003] However, aromatic diurea needs to be blended in a large amount in order to obtain grease having the same hardness as compared with diurea compounds other than aromatic diurea. As a result, the stirring resistance of the grease increases, and low torque performance cannot be satisfied. [0004] As an example of using a thickener other than an aromatic diurea, Patent Document 1 proposes a grease characterized in that a base oil containing an ether-based synthetic oil in an amount exceeding...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M169/00C10M101/02C10M105/02C10M107/02C10M115/08C10M129/34C10M129/42C10M135/10C10N10/04C10N20/00C10N20/02C10N30/02C10N30/12C10N40/02C10N50/10
CPCC10M2207/127C10N2230/12C10M2215/1026C10M2219/044C10M2203/1025C10M2205/003C10M169/00C10M2207/123C10M169/06C10N2230/02C10N2230/06C10N2220/023C10M2207/289C10N2240/02C10M2205/0285C10M2203/1006C10N2220/022C10N2250/10C10N2020/011C10N2020/02C10N2030/06C10N2030/02C10N2030/12C10N2040/02C10N2040/14C10N2040/40C10N2050/10C10N2010/04C10N2060/02
Inventor 今井裕相田亮
Owner KYODO YUSHI CO LTD
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