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Silicone grease composition

a technology of silicone grease and composition, applied in the field of silicone composition, can solve the problems of difficult formation of lubricating film, etc., and achieve the effect of reducing wear prevention characteristics and improving frictional characteristics

Inactive Publication Date: 2017-01-05
KYODO YUSHI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a silicone grease composition that can be used for lubricating parts that require high resistance to friction and wear. It contains a mixture of three diurea compounds, a thickener, a base oil, and a friction modifier. The composition has good properties and can be used for various applications such as clutch and torque limiter mechanisms. The surface of the parts to be lubricated can be made of steel. The use of the specific base oil and the combination of diurea compounds provides improved properties of the silicone grease composition.

Problems solved by technology

Those grease compositions make use of the advantages of the silicone oils that the coefficients of friction are high, and in addition, the surface tensions of the silicone oils range from 20 to 25 dyn / cm2, which are lower than those of other oils, so that a lubrication film may not readily be formed, thereby easily attaining to boundary lubrication.

Method used

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  • Silicone grease composition
  • Silicone grease composition

Examples

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examples

Base Oil

[0035]A silicone oil of formula (1) where R1 and R2 are each independently methyl group or phenyl group, with the ratio of methyl group to the whole organic groups being 95 mol. % was used.

Thickener

[0036]An alicyclic aliphatic diurea prepared from diphenylmethane-4,4′-diisocyanate, cyclohexylamine and octadecylamine was used.

Friction Modifiers

[0037]Magnesium oxide (Mohs hardness: 5-6; Average particle diameter: 0.5 μm)[0038]Zinc oxide (Mohs hardness: 4-5; Average particle diameter: 0.2 μm)[0039]Molybdenum oxide (Mohs hardness: 2-3; Average particle diameter: 2.1 μm)[0040]Titanium oxide (Mohs hardness: 7-8; Average particle diameter: 0.15 μm)[0041]Boron nitride (Mohs hardness: 10; Average particle diameter: 4 μm)

[0042]Predetermined amounts of amines (i.e., cyclohexylamine and octadecylamine) were reacted with diphenylmethane diisocyanate in the base oil to prepare a base grease. By adding the base oil and other additives to the base grease, the resultant mixture was subjected...

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Abstract

The invention provides a silicone grease composition where the high friction properties are improved, with no decrease of the wear preventive characteristics. The silicone grease composition contains a thickener, a base oil containing a silicone oil in an amount of 50 mass % or more of the total mass of the base oil, and a metallic oxide with a Mohs hardness of 6 or less as a friction modifier.

Description

TECHNICAL FIELD[0001]The present invention relates to a silicone composition. More particularly, the invention relates to a silicone grease composition suitably used for the parts to be lubricated, to be more specific, the lubrication parts of the clutch, the torque limiter mechanism and the like where high coefficient of friction and excellent wear preventive characteristics are needed.BACKGROUND ART[0002]In consideration of the global environmental problems, weight reduction of the automobile has been advancing. In line with this tendency, a variety of portions tend to use more clutches and torque limiter mechanisms than ever. Of such a variety of clutches and torque limiter mechanisms using the grease composition in the automobile, the engine starter clutch is exposed to the highest torque and the severest operating conditions.[0003]The clutch of the engine starter is composed of a clutch outer, a clutch inner, a roller disposed in a wedge-like space formed between the clutch out...

Claims

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Application Information

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IPC IPC(8): C10M107/50C10M115/08C10M169/06C10M169/02C10M125/10C10M169/04
CPCC10M169/04C10M169/00C10M2201/061C10M2201/1006C10M2229/0415C10M2229/0425C10M169/06C10M2201/062C10M2215/1026C10N2020/06C10N2030/06C10N2040/04C10N2050/10C10N2010/08C10N2010/12C10N2010/04C10M107/50C10M125/10C10M115/08C10M169/02C10M2227/045
Inventor HIROOKA, IWAKIYOSHINARI, TERASU
Owner KYODO YUSHI CO LTD