Stabiilzed fluids for industrial applications
AssigneeE. I. Du Pont de Nemours and Company
InventorsHari Babu Sunkara, Raja Hari Poladi
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Abstract
The present invention is directed toward compositions suitable for use as dielectric fluids, lubricant fluids and biodiesel fluids. Compositions described herein are obtained from a saturated, unsaturated or combinations of both monol, diol, triol or polyol acyl ester based fluid and/or a non-ester based fluid and 2,4,6-tris(di-C1-C6-alkylaminomethyl)phenol and/or the carboxylic acid salt of 2,4,6-tris(di-C1-C6-alkylaminomethyl)phenol. These compositions demonstrate improved oxidative stability and/or hydrolytic stability at higher use temperatures.
Claims12
A stabilized dielectric fluid composition comprising:
- (a) at least one component selected from the group consisting of:
- (i) an ester based fluid comprising saturated and/or unsaturated esters of mono-, di-, tri- or polyhydroxyl alcohols;
- and
- (ii) a non-ester based fluid selected from the group consisting of mineral oil, silicones, poly(alpha olefins) and combinations thereof;
- and
- (b) at least one component selected from the group consisting of:
- (i) a 2,4,6-tris(di-C1-C6-alkylaminomethyl)phenol (TAP);
- and
- (ii) a salt of a at least one mono C12-C30 carboxylic fatty acid and a TAP having a molar ratio of up to 3 moles of mono C12-C30 carboxylic fatty acid per mole of TAP;
- and
- characterized in that the stabilized dielectric fluid composition has an oxidative stability index (OSI) of greater than about 20 hours at 130° C. as measured by AOCS 12b-92.
A method for stabilizing a dielectric fluid composition comprising:
- mixing together at or above room temperature:
- (a) at least one component selected from the group consisting of:
- (i) an ester based fluid which comprises saturated and/or unsaturated esters of mono-, di-, tri- or polyhydroxyl alcohols;
- and
- (ii) a non-ester based fluid selected from the group consisting of mineral oil, silicones, poly(alpha olefins) and combinations thereof;
- and
- (b) at least one stabilizing additive selected from the group consisting of:
- (i) 2,4,6-tris(di-Ci-C6-alkylaminomethyl) phenol (TAP);
- and
- (ii) a salt of a at least one mono C12-C30 carboxylic fatty acid and TAP having a molar ratio of up to 3 moles of mono C12-C30 carboxylic fatty acid per mole of TAP.
Dependencies are inferred from the claim text.