High conductivity fluid for air compressor applications

Inactive Publication Date: 2017-12-21
THE LUBRIZOL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a lubricant composition for air compressors that helps to reduce the buildup of electrical charge and the associated risk of ignition or explosions. The composition contains at least one oil of lubricating viscosity and at least one C4 or greater polyalkylene glycol. The polyalkylene glycol has repeating units that contain an alkylene oxide derived moiety with a C4 or greater alkyl group. The ratio of the C4 or greater polyalkylene glycol to the other polyalkylene glycols can be from 1:1. The lubricant composition can also contain other additives commonly used in compressor lubricants. The method of operating an air compressor with this lubricant composition can help to improve safety and prevent damage due to electrical charge buildup.

Problems solved by technology

The inventors have found that known anti-static additives do not work in compressors.
For example, most commercial anti-static additives lose conductivity properties when subjected to the heating that occurs in such compressors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0067]The electrical conductivity results of air compressor lubricant compositions are shown in Tables 1 and 2. All formulations were combinations of the base oils listed with and without anti-static additives. All formulations described contained a standard commercial additive package providing antioxidancy, corrosion inhibition and foam control to the finished air compressor fluid. Anti-stat#1 is a mixture of kerosene, o-xylene, dodecylbenzene sulfonic acid, heavy aromatic naptha, and other chemicals, available from Innospec™ under the trade name STADIS™ 425. Antistat#2 is a mixture of polyalkylene glycols containing C4 or greater polyalkylene glycols, available from Dow™ as OSP46™.

[0068]Results show the raising of electrical conductivity as desired with the use of both additives in various base oil types and combinations.

TABLE 1Electrical FormulationAnti-Stat ConductivityNumberBase Oil Composition Additive(pS / m)190% PAO 10% DiesterNone270% PAO 30% POENone3360% PAO 40% POENone1944...

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Abstract

The disclosed technology relates to a lubricant composition containing a polyalkylene glycol in which greater than 50% of the repeating units in the polyalkylene glycol contain an alkylene oxide derived moiety comprising a C4 or greater alkyl group. The lubricant compositions are particularly useful in compressors, such as a reciprocating rotary vane, scroll, or rotary screw air compressor.

Description

BACKGROUND OF THE INVENTION[0001]The disclosed technology relates to a lubricant composition containing a polyalkylene glycol in which greater than 50% of the repeating units in the polyalkylene glycol contain an alkylene oxide derived moiety comprising a C4 or greater alkyl group. The lubricant compositions are particularly useful in compressors, such as a reciprocating rotary vane, scroll, or rotary screw air compressor.[0002]Lubricating oils have been used in the past to lubricate the bearings of positive displacement compressors, to seal the rotors, and to cool the compressed gases. Lubricating oils typically used in the industry comprise a mineral oil or synthetic oil as a base oil, and various additives for a particular purpose. Oxidation stability and varnish and deposit control are some of the important properties desirable in a lubricant for maximizing the life of the lubricant, and hence, the life of the equipment, especially under the high temperature and pressure conditi...

Claims

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Application Information

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IPC IPC(8): C10M107/34C10M145/32
CPCC10M107/34C10N2240/30C10M2203/06C10M2203/10C10M2203/1006C10M2203/108C10M2205/0285C10M2207/2805C10M2207/2825C10M2207/2835C10M2207/40C10M2207/401C10M2209/1045C10M2209/105C10M2209/1055C10M2209/106C10M2209/1065C10M2219/044C10N2230/28C10M145/32C10M2209/104C10N2030/28C10N2040/30
Inventor FOSTER, MICHAEL G.BAKER, MARK R.BRIGGS, CARRIE S.FITING, CASEY R.
Owner THE LUBRIZOL CORP
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