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Additive package for high temperature synthetic lubricants

a synthetic lubricant and additive technology, applied in the field of additive packages, can solve the problems of lack of commercial lubricants for chain and drive gear operations, lack of high-temperature stability, etc., and achieve the effect of reducing weight loss

Inactive Publication Date: 2007-08-09
CHEMTURA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] Yet another object of the invention is to provide an improved high temperature polyol ester synthetic lubricant including a dipentaerythritol ester and an additive package that has reduced weight loss when subject to heat for extended periods of time.
[0015] Still another object of the invention is to provide an improved polyol ester lubricant oil for high temperature application that does not form hard varnish and undesirable deposits when subject to high temperature.

Problems solved by technology

Existing commercial lubricants for chain and drive gear operations, which are based on vegetable oils or other glycerol-based esters and mineral oil, lack sufficient high-temperature stability.
Polyolefins or polyacid esters also lack the necessary high-temperature stability.
All these lubricants are prone to varnish formation and are characterized by relatively high volatility, as well as severe compatibility problems with silicone elastomers.
Difficult applications such as the constant velocity joints of front wheel drive automobiles can overstress conventional greases by exceeding their temperature limitations.
However, as shown in comparative testing below such lubricants based on these polyalphaolefins tend to evaporate under high temperature exposure and are not fully satisfactory.
Presently, no 100% polyalphaolefin based chain lubricants are fully satisfactory in this respect.

Method used

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  • Additive package for high temperature synthetic lubricants

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041] A dipentaerythritol hexaisononanoate ester was prepared in a reaction vessel equipped with a mechanical stirrer, thermocouple, thermoregulator, Dean-Stark trap, condenser, nitrogen sparge and vacuum source. The following materials were charged to the reactor:

INGREDIENTAMOUNT gms (moles)Dipentaerythritol1225 g (4.8 m)Isononanoic acid5175 g (32.75 m)

[0042] The reaction mixture was heated to 185°-190° C. with agitation. The water-of-reaction was collected in and removed from the Dean-Stark trap. The temperature was gradually raised over 5-6 hours to about 230° C. with application of vacuum to maintain reflux. This removed the reaction water and returned the acid collected in the trap to the reactor. These conditions were maintained to a point where the hydroxyl number of the reaction mixture was less than 3.0. The bulk of the excess acid was then removed by vacuum distillation together with nitrogen sparge and then residual acidity was removed with alkali.

[0043] The resulting...

example 2

[0044] A dipentaerythritol ester having a viscosity of about 150 cSt at 40° C. can be prepared in a vessel in the same manner as described for the ester in Example 1. In this case, the following materials are charged to the reactor:

INGREDIENTAMOUNT gms (moles)Dipentaerythritol1225 g (4.8 m) Heptanoic acid597 g (4.59 m)Caprylic / capric acid1094 g (7.06 m) Isononanoic acid3283 g (20.78 m)

[0045] The reaction mixture is heated to 185°-190° C. with agitation. The water-of-reaction is collected in and removed from the Dean-Stark trap. The temperature is gradually raised over 5-6 hours to about 230° C. with application of vacuum to maintain reflux. This removes the reaction water and returns the acid collected in the trap to the reactor. These conditions are maintained to a point where the hydroxyl number of the reaction mixture is less than 3.0. The bulk of the excess acid is then removed by vacuum distillation together with nitrogen sparge and then residual acidity was removed with alka...

example 3

[0047] An additive package of an oligomeric amine antioxidant and borated antiwear agent in accordance with the invention was added to the polyol esters prepared in Example 1 to formulate the lubricating fluid. The esters of Runs 1 and 2 from Example 1 were formulated as follows:

TABLE IILubricating FluidComponentWeight %Polyol ester92.95Oligomeric amine antioxidant3.00Borate antiwear agent2.00Secondary antiwear agents2.00Corrosion inhibitor0.05Anti-foaming agent5 ppm

[0048] The resulting lubricant fluids had the following physical properties:

TABLE IIIRun 3Run 4Viscosity, cSt@ 100° C.:25.625.3@ 40° C.:386384Viscosity Index:8687Pour Point, ° C.:−20 (−5) −37 (−35)Flash Point, C.O.C., ° C.(° F.):310 (590)310 (590)Acid Valve, mgKOH / g:.36.38

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PUM

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Abstract

An improved additive package including at least a polymeric amine antioxidants and a borated extreme pressure / antiwear agent for a polyol ester lubricant suitable for use in high temperature applications is provided. The lubricant fluid includes a base stock that is the reaction product of a polyol and monocarboxylic acid mixture including a major proportion of 3,5,5-trimethylhexanoic acid (iso-C9 acid). The additive package may be added in up to about 20 percent by weight of the lubricant to provide a viscosity of the lubricant at 40° C. of at least about 140 cSt and at 100° C. of no less than about 15.0 cSt. Greases are formed by adding a thickener to a high viscosity lubricating fluid.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is based on and claims the benefit of U.S. provisional application Ser. No. 60 / 750,922, filed Dec. 16, 2006.BACKGROUND OF THE INVENTION [0002] This invention relates generally to high temperature lubricant fluids and, more particularly to an additive package including at least an oligomeric aromatic amine antioxidant and a borated compound for use with a polyol ester to provide a lubricant fluid suitable for use in applications operating at temperatures in excess of 250° C. [0003] There are continuing demands for lubricant compositions suitable to operate at high temperature in excess of 250° C. Such lubricants must provide lubrication and antiwear protection. In addition, they must be stable in the high temperature environment, or decompose harmlessly without forming hard, varnish-like deposits or unacceptable amounts of smoke. Many industrial processes involve operation of open chain and drive gear assemblies that are...

Claims

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Application Information

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IPC IPC(8): C10M111/04
CPCC10M141/12C10M159/12C10N2260/14C10M169/04C10M169/044C10M169/06C10M2201/087C10M2207/283C10M2207/2835C10M2215/064C10M2215/065C10M2215/223C10M2217/0456C10M2219/066C10M2219/104C10M2223/047C10N2210/02C10N2210/08C10N2230/02C10N2230/08C10N2230/10C10N2240/04C10N2250/10C10N2210/03C10N2010/14C10N2030/08C10N2030/02C10N2030/10C10N2040/04C10N2010/04C10N2060/14C10N2050/10C10N2010/06
Inventor CARR, DALE D.SCHAEFER, THOMAS G.HUTTER, JEFFREY A.
Owner CHEMTURA CORP