Overbased metal carboxylate calcite-containing greases

a technology of over-based metal carboxylate and grease, which is applied in the field of grease preparation from over-based metal carboxylate, can solve the problems of increasing challenges

Inactive Publication Date: 2008-11-06
OMG AMERICAS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Grease manufacturing includes a multi-step process and numerous additives to provide property enhancements which present an increasing challenge to the specialty, food-grade and bio-based grease formulators.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0060]In a 3-liter reactor was placed 507.2 g. of oleic acid, 972.6 g. of 4 CST PAO, 270.0 g. of Epal 14-18 and 109.1 g. of propylene glycol. The mixture was heated with stirring to about 38° C. (100° F.) to melt the Epal 14-18, followed by the addition of 50 g. of water and an initial amount of lime (70.8 g.), as the alkaline earth metal base, was added to neutralize the oleic acid. The heating was continued to about 93° C. (200° F.) and the first portion of 207.5 g of lime (Microcal HF) was added. The mixture was carbonated at about 93° C. (200° F.) with carbon dioxide at a rate of 2 SCFH until the lime was consumed and neutralized, as indicated by a colorless spot on a phenolphthalein-saturated filter paper. The carbonation took approximately 1 hour and 35 minutes. The carbon dioxide addition was stopped, and a second 207.5 g. portion of lime was added. The carbon dioxide addition at about 93° C. (200° F.) was resumed at 3 SCFH for about another 1 hour and 30 minutes, when the ph...

example 2

[0065]With a grease precursor containing amorphous calcium carbonate and elevated levels of calcite made using Star 4 Group III oil as the base oil, wherein the grease precursor measured 16.45% Ca by weight, TBN 403, 13% calcite by weight, 600 g. of the precursor was placed in a reactor followed by the addition of 400 g. of 350 SUS oil, 50 g. of water, and 40 g. of glacial acetic acid. The mixture was heated at about 104° C. (220° F.) for approximately 2 hours and 20 minutes under reflux conditions in a nitrogen atmosphere. Next, water was removed under vacuum. The resulting grease was analyzed and found to contain 17.9% calcite by weight and 6.7% vaterite by weight.

[0066]The grease was then tested and yielded the following results:

Cone Penetration305Load Wear Index (ASTM D 2596-97)57.48Last Non-Seizure Load32 KgWeld Load (ASTM D 2596-97)500 KgFour Ball Wear (ASTM 2266-01)0.50 mmWater Washout (ASTM D 1264-00)0.3%

example 3

[0067]Example 2 was repeated, except that 30.0 g. of lime was added to the reaction mixture. The mixture was heated at about 104° C. (220° F.) for approximately 2 hours and 20 minutes under reflux conditions in a nitrogen atmosphere. Next, water was removed under vacuum. The resulting grease had a cone penetration of 213. The grease was further let down 50% with an additional amount of 350 SUS oil resulting in a cone penetration of 265. The let down grease was analyzed and found to contain 16.3% calcite by weight and 5.0% vaterite by weight.

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Abstract

Grease precursors of overbased alkaline earth metal carboxylates are prepared by reacting an alkaline earth metal base and a carboxylic acid in the presence of a hydrocarbon liquid, a polyol and an alcohol. The resulting grease precursor has amorphous calcium carbonate and a calcite content of greater than 10% by weight. At least one converting agent is added to the grease precursor containing elevated levels of calcite. This mixture is heated followed by the removal of water to form calcite-containing greases having a calcite content greater than 12.5% by weight.

Description

TECHNICAL FIELD[0001]The invention relates to greases prepared from an alkaline earth metal salt of a fatty acid. More particularly, the invention relates to greases prepared from calcite-containing overbased metal carboxylates.BACKGROUND OF THE INVENTION[0002]Grease manufacturing includes a multi-step process and numerous additives to provide property enhancements which present an increasing challenge to the specialty, food-grade and bio-based grease formulators. The resulting grease performance is also strongly dependent upon the processing conditions such as temperature, pressure, residence times and saponification stoichiometry.[0003]An important step in the production of a grease is the formation of the thickener microstructure. The process constitutes a reaction between a carboxylic acid, an alkali or alkaline earth metal, water and a base oil. The microstructure of the crystalline material, or the matrix, in the grease enables the uptake and release of the lubricious oil. The...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M159/18
CPCC10M159/20C10M2201/0626C10M2203/1006C10M2205/0285C10M2207/021C10M2207/022C10M2207/046C10M2207/122C10M2207/1265C10M2207/2613C10M2209/1023C10M2209/105C10N2230/06C10N2230/26C10N2230/52C10N2250/10C10N2270/00C10N2210/02C10N2030/06C10N2030/26C10N2030/52C10N2050/10C10N2070/00C10N2010/04
Inventor RAMEY, CHESTER E.
Owner OMG AMERICAS INC
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