US2013267448A1PendingUtilityA1

Lubricant for oxygen - enriched environments

37
Assignee: GOODAN GARYPriority: Apr 10, 2012Filed: Apr 10, 2012Published: Oct 10, 2013
Est. expiryApr 10, 2032(~5.7 yrs left)· nominal 20-yr term from priority
Inventors:Gary GoodanMichael QualloSeth Ankrom
C10M 169/02C10N 2030/08C10M 2201/0616C10N 2040/06C10M 2213/0606C10N 2050/10C10N 2030/10C10N 2020/06
37
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Claims

Abstract

A lubricating grease containing about 75 to 85% by weight of a liquid perfluoropolyether and about 15 to 25% by weight of a particulate boron nitride, preferably monomodal boron nitride having a particle size of about 7 to 10 microns; use of the lubricating grease for lubricating structures subjected to an oxygen-enriched environment and devices containing such lubricated structures.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A process for lubricating a structure exposed to an oxygen enriched fluid which comprises lubricating the structure with a lubricating grease comprising about 75 to 85 weight percent of a high molecular weight liquid perfluoropolyether and about 15 to 25 weight percent of a particulate boron nitride having a particle size of about 7 to 11 microns. 
     
     
         2 . The process of  claim 1  wherein the perfluoropolyether has a molecular weight of at least 1,000 and the boron nitride has a particle size of 7 to 10 microns. 
     
     
         3 . The process of  claim 2  wherein the boron nitride is composed primarily of single crystal hexagonal platelets. 
     
     
         4 . The process of  claim 3  wherein the boron nitride is monomodal boron nitride. 
     
     
         5 . The process of  claim 4  wherein the lubricated structure is subjected to a gaseous or liquid fluid containing at least about 99.5 mol percent oxygen. 
     
     
         6 . The process of  claim 1  wherein the perfluoropolyether comprises a perfluoropolyether of the formula: F—(CF(CF 3 )—CF 2 —O) k —CF 2 CF 3  in which k is about 10 to 60. 
     
     
         7 . The process of  claim 1  wherein the perfluoropolyether comprises a perflluoropolyether of the formula: F—(CF 2 CF 2 CF 2 —O) d —CF 2 CF 3  in which d is about 15 to 60. 
     
     
         8 . The process of  claim 1  wherein the perfluoropolyether comprises a perfluoropolyether of the formula CF 3 O—[CF(CF 3 )CF 2 —O] m —[CF 2 —O] n —CF 3  in which m+n is about 8 to 45 and m/n is about 20 to 1,000 or of the formula: CF 3 O—(CF 2 CF 2 —O) p —(CF 2 —O) q— CF 3  in which p+q is 40 to 180 and p/q is 0.5 to 2. 
     
     
         9 . The process of  claim 1  wherein the grease has an autogenous ignition temperature of at least about 400 degrees centigrade in >99.5% oxygen concentration. 
     
     
         10 . The process of  claim 1  wherein the grease has an average heat of combustion of about 1,280 calories/gram in >99.5% oxygen concentration. 
     
     
         11 . A device of the type which will contain a continuously or intermittently supplied oxygen enriched atmosphere, said device comprising an internal lubricated structure lubricated with the grease of  claim 1 . 
     
     
         12 . A device of the type internally pressurized with an oxygen enriched atmosphere, said device comprising an internal structure lubricated with the grease of  claim 1 . 
     
     
         13 . A device of the type which will contain a continuously or intermittently supplied oxygen enriched atmosphere, said device comprising an internal lubricated structure lubricated with the grease of  claim 2 . 
     
     
         14 . A device of the type internally pressurized with an oxygen enriched atmosphere, said device comprising an internal structure lubricated with the grease of  claim 2 . 
     
     
         15 . A device of the type which will contain a continuously or intermittently supplied oxygen enriched atmosphere, said device comprising an internal lubricated structure lubricated with the grease of  claim 4 . 
     
     
         16 . A device of the type internally pressurized with an oxygen enriched atmosphere, said device comprising an internal structure lubricated with the grease of  claim 4 . 
     
     
         17 . A lubricating grease comprising about 75 to 85 percent by weight of a liquid perfluoropolyether having a molecular weight of at least 1000 and about 15 to 25 weight percent of a particulate monomodal boron nitride having a particle size of about 7 to 10 microns. 
     
     
         18 . The lubricating grease of  claim 17  wherein the boron nitride is composed of single crystal hexagonal platelets. 
     
     
         19 . A lubricating grease consisting essentially of about 75 to 85 percent by weight of a liquid perfluoropolyether having a molecular weight of at least 1000 and about 15 to 25 weight percent of a particulate monomodal boron nitride having a particle size of about 7 to 10 microns. 
     
     
         20 . The lubricating grease of  claim 19  wherein the boron nitride is composed of single crystal hexagonal platelets. 
     
     
         21 . The lubricating grease of  claim 19  wherein the perfluoropolyether comprises a perfluoropolyether of the formula: F—(CF(CF 3 )—CF 2 —O) k —CF 2 CF 3 : in which k is about 10 to 60. 
     
     
         22 . The lubricating grease of  claim 21  wherein the perfluoropolyether comprises a perflluoropolyether of the formula: F—(CF 2 CF 2 CF 2 —O) d —CF 2 CF 3  in which d is about 15 to 60. 
     
     
         23 . The lubricating grease of  claim 19  wherein the perfluoropolyether comprises a perfluoropolyether of the formula CF 3 O—[CF(CF 3 )CF 2 —O] m —[CF 2 —O] n —CF 3  in which m+n is about 8 to 45 and m/n is about 20 to 1,000 or of the formula: CF 3 O—(CF 2 CF 2 —O) p —(CF 2 —O) q— CF 3  in which p+q is 40 to 180 and p/q is 0.5 to 2. 
     
     
         24 . A lubricating grease consisting of about 75 to 85 percent by weight of a liquid perfluoropolyether having a molecular weight of at least 1000 and about 15 to 25 weight percent of a particulate monomodal boron nitride having a particle size of about 7 to 10 microns. 
     
     
         25 . The lubricating grease of  claim 24  wherein the boron nitride is composed of single crystal hexagonal platelets. 
     
     
         26 . The lubricating grease of  claim 24  wherein the perfluoropolyether comprises a perfluoropolyether of the formula F—(CF(CF 3 )—CF 2 —O) k —CF 2 CF 3  in which k is about 10 to 60. 
     
     
         27 . The lubricating grease of  claim 24  wherein the perfluoropolyether comprises a perflluoropolyether of the formula F—(CF 2 CF 2 CF 2 —O) d —CF 2 CF 3  in which d is about 15 to 60. 
     
     
         28 . The lubricating grease of  claim 24  wherein the perfluoropolyether comprises a perfluoropolyether of the formula CF 3 O—[CF(CF 3 )CF 2 —O] m —[CF 2 —O] n —CF 3  in which m+n is about 8 to 45 and m/n is about 20 to 1,000 or of the formula: CF 3 O—(CF 2 CF 2 —O) p —(CF 2 —O) q— CF 3  in which p+q is 40 to 180 and p/q is 0.5 to 2.

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