Grease composition and bearing

A grease composition, fatty acid technology, is used in bearings. In the field, it can solve the problems of insufficient low temperature fluidity and achieve the effect of improving low temperature torque, lubrication life and stable lubricity

Inactive Publication Date: 2008-12-10
KYODO YUSHI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current situation is that even if the grease using these base oils is used in rolling bearings, the low-temperature fluidity is not sufficient, and a product that satisfies users has not yet been obtained.

Method used

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  • Grease composition and bearing
  • Grease composition and bearing
  • Grease composition and bearing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0048] 1. Test grease

[0049] The compounding recipe shows Examples 1-6 in Table 1, and Comparative Examples 1-13 are shown in Table 2 and Table 3.

[0050] 2. Synthesis of pentaerythritol tetraester oil

[0051] Using pentaerythritol and fatty acid as raw materials, ester synthesis is carried out by a general dehydration reaction using an acid catalyst such as alkylbenzenesulfonic acid.

[0052] 3. Manufacturing method of grease

[0053] Measure the base oil and thickener into the container, heat to 230°C, and cool. After cooling, add a specified amount of additives, fully stir, knead with a three-roller mill, adjust the consistency to 230-270 with a kneader, and defoam to obtain a grease composition.

[0054] 4. Analysis method and evaluation test method

[0055] Kinematic Viscosity and Viscosity Index

[0056] The measurement was carried out in accordance with the "Kinematic Viscosity Test Method for Crude Oil and Petroleum Products and Calculation Method for Viscosit...

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Abstract

Disclosed is a grease composition containing base oil and a thickening agent, wherein the base oil contains an ester oil which is composed of pentaerythritol and a fatty acid and represented by the general formula (1) below. This grease composition is characterized by containing a pentaerythritol tetraester oil wherein the fatty acid is composed of at least 51-55% by mass of 2-ethylhexane acid and 39-49% by mass of caprylic acid and capric acid in total (provided that the caprylic acid is not less than 30% by mass and the capric acid is 5-10% by mass). Also disclosed is a bearing in which such a grease composition is sealed. C(CH2OCOR<1>)4 (1) (In the formula, R<1> represents a linear and / or branched fatty acid residue having 6-12 carbon atoms.) The grease composition is suitable for rolling bearings under low temperature conditions and exhibits stable lubricity for a long time.

Description

technical field [0001] The present invention relates to a grease composition comprising an ester oil-containing base oil and a thickener. More specifically, it relates to a grease composition suitable for rolling bearings having improved low-temperature torque and long lubrication life, and a bearing enclosing the same. Background technique [0002] In order to improve the low-temperature torque and lubrication life of the grease composition, the properties required by the base oil are high viscosity index, low-temperature fluidity, thermo-oxidative stability, and low volatility. and various proposals to improve the performance of base oils. [0003] Base oils used in grease compositions are generally roughly classified into mineral oils and synthetic oils. Mineral oils are currently widely used as grease base oils. However, although mineral oil has the advantage of being cheap, it also has the disadvantage of significantly deteriorating lubricity when used at low tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M105/38F16C33/66C10N20/00C10N20/02C10N30/08C10N40/02C10N50/10
CPCC10M105/38C10M169/02C10M2207/1285C10M2207/2835C10M2215/064C10M2215/223C10M2219/044C10N2010/04C10N2020/02C10N2040/02C10N2050/10C10N2020/085F16C33/6633F16C33/66
Inventor 今井裕大贯裕次柴山淳
Owner KYODO YUSHI CO LTD
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