Compositions – Electrolytes for electrical devices
Patent
1991-02-11
1992-08-11
Willis, Jr., Prince
Compositions
Electrolytes for electrical devices
252 68, 252 58, 252 52A, C10M10554, C10M13108, C10M16904, C25D 1100
Patent
active
051376504
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a lubricating oil composition, more particularly, to a lubricating oil composition comprising a specified alcohol and a polyether compound.
Because of its excellent anti-seizure property and a stable and favorable compatibility also shown in an atmosphere of refrigerant such as Flon (fluorohydrocarbon), the lubricating oil composition of the present invention is favorably used as a refrigerator oil or a heat-pump oil.
BACKGROUND ART
Recently, refrigerators have showed a marked tendency to become more compact and lighter with higher efficiency. The compressors of refrigerators have changed from reciprocating type to rotary type, and further an inverter has been mounted, and the temperature of the exhausted gas has been getting higher and higher by the recovery of the waste heat from heat pumps. As the refrigerant to be used for these refrigerators, fluoroethane refrigerants such as Flon-134a (1,1,1,2-tetrafluoroethane) or Flon-134 (1,1,2,2-tetrafluoroethane) have attracted attention as new refrigerants without bad effect on the ozone layer, and as a refrigerator oil having a high suitability to these refrigerants, polyglycol compounds have been proposed (e.g., Specification of U.S. Pat. No. 4,755,316).
On the other hand, fluoroalkyl group-containing alcohols can be prepared according to the method described in Japanese Patent Publication No. 8807/1977. It is known that the polymers obtained by polymerizing the ester of the fluoroalkyl group-containing alcohol with acrylic acid or methacrylic acid is used as a water-repellent oily agent, or the fluoroalkyl phosphate obtained through the reaction of said alcohol with phosphorus oxichloride is used as the surfactant.
The polyglycol compounds which are highly suitable for fluoroethane refrigerants are insufficient not only in lubricity (anti-seizure property) but also in hightemperature solubility to fluoroethane refrigerants, and accordingly have been desired for improvement in these properties.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a polyether-based lubricating oil composition excellent in lubricity (anti-seizure property), and also in high-temperature solubility to slightly soluble refrigerants such as fluoroethane refrigerant.
The present invention provides a lubricating oil composition which comprises a fluoroalkyl group-containing alcohol represented by the general formula : (preferably 2 to 10), and R.sub.f is a fluoroalkyl group having 5 to 16 carbon atoms, providing that the number of fluorine atoms in R.sub.f is at least 2n-3 (wherein n indicates the number of carbon atoms in R.sub.f), and that at least one fluorine atom is bonded to each carbon atom in R.sub.f) and a polyether compound. The present invention provides a process for effecting lubrication in a compressor-type refrigerator using fluorohydrocarbon as the refrigerant which comprises employing a lubricant containing the above-described composition as the main component, and further the present invention provides a compressor-type refrigerator system which comprises a compressor, a refrigerant consisting of fluorohydrocarbon, and a lubricant containing the above composition as the main component.
THE MOST PREFERRED EMBODIMENT TO CARRY OUT THE INVENTION
In the fluoroalkyl group-containing alcohol represented by the general formula (I), R.sup.1 is an alkylene group having 2 to 15 carbon atoms (preferably 2 to 10), more specifically an ethylene group, a propylene group, a butylene group, a hexamethylene group, an octamethylene group, a methylethylene
a methylpropylene group. R.sub.f is a fluoroalkyl group having 5 to 16 carbon atoms. If a fluoroalkyl group-containing alcohol in which R.sub.f having less than 5 carbon atoms is used, the anti-seizure property of the lubricating oil composition becomes undesirably insufficient, and if the number of carbon atoms is in excess of 16, the solubility to polyether compounds becomes undesirably lowered. If the number of fluorine atoms in R.sub.f is less tha
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Idemitsu Kosan Co. Ltd.
Silbermann J.
Willis Jr. Prince
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