Lubricant Compositions Containing Stable Boric Acid Suspension
A lubricant composition including a lubricant comprising at least one of a hydrocarbon oil or grease, a surfactant, an ester of adipic acid, and a suspension of boric acid.
1 . A lubricant composition, comprising:
a lubricant comprising at least one of a hydrocarbon oil or grease;
about 0.001 wt.% to about 0.5 wt .% of a surfactant comprising octylphenol ethoxylate or polyalkylene plycol ether;
an ester of adipic acid chemically-linked to the at least one lubricant; and
a suspension of particulate boric acid, wherein the boric acid has a particle size of 0.5 to 2.5 microns.
2 . A lubricant composition according to claim 1 , wherein the ester of adipic acid comprises diisodecyl adipate.
3 . A lubricant composition according to claim 1 , wherein the lubricant comprises at least one of a synthetic oil, a mineral oil, a silicon oil, a cutting oil, a transmission fluid, a hydraulic fluid, or a grease.
4 . (canceled)
5 . A lubricant composition according to claim 1 , wherein the boric acid has a particle size of 0.5 to about 1 micron.
6 . (canceled)
7 . A lubricant composition according to claim 1 , comprising 5 wt.% to about 25 wt.% boric acid based on the weight of the lubricant composition.
8 - 10 . (canceled)
11 . A lubricant composition, comprising:
a lubricant comprising at least one of a hydrocarbon oil or grease;
about 0.001 wt.% to about 0.5 wt.% of a surfactant comprising polyalkylene glycol ether; and
a boric acid suspension comprising particulate boric acid and diisodecyl adipate chemically linked to the lubricant, wherein the boric acid has a particle size of 0.5 to 2.5 microns.
12 . (canceled)
13 . A method of making a lubricant composition comprising a stable boric acid suspension, said method comprising:
mixing an ester of adipic acid, a surfactant comprising octylphenol ethoxylate or polyalkylene glycol ether, and boric acid having a particle size of 0.5 to 2.5 microns to form a mixture by high shear blending, wherein a temperature of the mixture does not exceed 120° F.;
adding a lubricant comprising at least one of a hydrocarbon oil or grease to the mixture;
chemically linking the ester of adipic acid to the at least one lubricant and forming a suspension of boric acid in the at least one lubricant.
14 . A method according to claim 13 , further comprising dissolving an ester of adipic acid comprising diisodecyl adipate in a solvent.
15 - 16 . (canceled)
17 . A method according to claim 13 , wherein a graft initiator and catalyst are not used in making the lubricant composition.
18 . A lubricant composition according to claim 1 , wherein the ester of adipic acid comprises a monomer or prepolymer that is chemically linked to the at least one lubricant via polymer chains.
19 . A lubricant composition according to claim 18 , wherein polar sites on the polymer chains form bridges between the particulate boric acid and the at least one lubricant.
20 . A lubricant composition according to claim 1 , wherein the ester of adipic acid is chemically-linked to the at least one lubricant via hydrogen-carbon bonds.
21 . A lubricant composition according to claim 1 , wherein the surfactant comprises octylphenol ethoxylate.
22 . A lubricant composition according to claim 1 , comprising about 200,000 ppm of boric acid.
23 . A lubricant composition according to claim 1 , wherein the surfactant comprises polyalkylene glycol ether.
24 . A lubricant composition according to claim 1 , comprising:
30 wt.% to 60 wt.% of at least one lubricant comprising a hydrocarbon oil or grease, based on the total weight of the lubricant composition;
5 wt.% to 50 wt.% of diisodecyl adipate chemically-linked to the at least one lubricant; and
5 wt.% to 25 wt.% of particulate boric acid, suspended in the at least one lubricant.
25 . A lubricant composition according to claim 1 , comprising 20 wt.% to about 25 wt.% of particulate boric acid, suspended in the at least one lubricant.
26 . A lubricant composition according to claim 1 , wherein the lubricant comprises a silicon oil.
27 . A lubricant composition according to claim 1 , wherein the lubricant comprises a hydraulic fluid.