Grease copositions

Inactive Publication Date: 2015-11-05
SHELL OIL CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]The lithium-containing calcium complex grease composition according to the present invention has a high dropping point and maintains a suitable consistency, and in addition to the fact that the composition can be used under a high temperature environment, which was only possible with lithium-

Problems solved by technology

With the advancement of mechanical technology such as automobiles or electric equipment, operating conditions are using higher temperatures and are getting harsher every year with the minimisation of size and weight and increase in output of various types of equipment.
However, since lithium, which is the starting material of lithium grease, is not limited in its use to grease and is variously used in other fields, there is concern about resource depletion or a steep rise in cost in the future due to a recent increase in demand.
In addition, lithium complex grease has problems in that the production procedure is complex and a longer time is required because the reaction of two kinds of aliphatic acid comprises two stages.
However, since an amine compound such as aniline, whic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0068]Starting materials, which were the base oil A, stearic acid, benzoic acid and acetic acid, were mixed in a grease manufacturing vessel, and the mixture was heated to 90° C. and the contents were dissolved. Next, calcium hydroxide and lithium hydroxide which were preliminarily dissolved and dispersed in an appropriate amount of distilled water were charged into the vessel. At this time, various carboxylic acids underwent a saponification reaction with the calcium hydroxide and lithium hydroxide, soap was slowly formed in the base oil, and the resulting product was further heated and dehydrated in order to form a grease thickener. After the completion of dehydration, the grease was heated to a temperature higher than 200° C., thoroughly stirred and mixed, and cooled down to room temperature. Thereafter, a three-roll mill was used in order to obtain uniform grease having No. 2.5 consistency.

example 2

[0069]Starting materials, which were the base oil A, stearic acid, p-toluic acid and acetic acid, were mixed in a grease manufacturing vessel and uniform grease having No. 3 consistency was obtained in the same manner as in Example 1.

example 3

[0070]Starting materials, which were the base oil A, behenic acid, benzoic acid and acetic acid, were mixed in a grease manufacturing vessel and uniform grease having No. 3 consistency was obtained in the same manner as in Example 1.

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Abstract

A grease composition comprising base oil and as thickener calcium complex soap and lithium soap is disclosed. A higher fatty acid, an aromatic monocarboxylic acid and a lower fatty acid are used as carboxylic acids constituting the calcium complex soap and lithium soap. The grease composition has a high dropping point and excellent shear stability, and exhibits thermal stability and long bearing life.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a grease composition. More specifically, the present invention relates to a heat-stable lithium-containing calcium complex-based grease composition which has a high dropping point and excellent shear stability, and exhibits long bearing life.BACKGROUND OF THE INVENTION[0002]With the advancement of mechanical technology such as automobiles or electric equipment, operating conditions are using higher temperatures and are getting harsher every year with the minimisation of size and weight and increase in output of various types of equipment. Consequently, there is an increased demand for improved performance of grease for use in various equipment under a high temperature. Grease compositions which have a high dropping point and excellent thermal stability have been proposed.[0003]In addition to the improvement in grease performance under a high temperature, there is also an increased demand for materials and the like which ar...

Claims

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Application Information

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IPC IPC(8): C10M123/02
CPCC10M123/02C10M129/26C10M2203/1006C10M2203/1025C10M2205/0285C10M2207/1225C10M2207/1265C10M2207/1285C10M2207/1415C10N2010/02C10N2030/10C10N2030/06C10N2030/74C10N2010/04C10N2040/02C10N2050/10C10N2020/02
Inventor WATANABE, KAZUYATANAKA, KEIJI
Owner SHELL OIL CO
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