Compositions – Electrolytes for electrical devices
Patent
1991-08-14
1995-04-04
Willis, Jr., Prince
Compositions
Electrolytes for electrical devices
252565, 252 56R, 252 68, C10M16904, C10M10734, C10M13704, C10M12976
Patent
active
054035031
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a refrigerator oil composition for hydrogen-containing hydrofluorocarbon refrigerant. More particularly, it relates to a refrigerator oil composition which has favorable miscibility with a hydrogen-containing hydrofluorocarbon (hydrogenated fluoroalkane) (hereinafter referred to as "hydrogenated Flon compound") such as 1,1,1,2-tetrafluoroethane (hereinafter referred to as "Flon 134a") capable of being used as a replacement of a chlorofluorocarbon (Flon compound) such as dichlorodifluoromethane (hereinafter referred to as "Flon 12") as a refrigerant now causing a serious environmental pollution problem, and at the same time, which is excellent in lubrication performance as well as wear resistance.
BACKGROUND ART
Polyoxyalkylene glycol derivatives have recently been reported as being effective as a lubricating oil for a refrigerator employing a hydrogenated Flon refrigerant such as Flon 134a without a fear of causing environmental pollution problem by virtue of their high miscibility with the above-mentioned hydrogenated Flon refrigerant (Specification of U.S. Pat. No. 4,755,316).
Nevertheless, the polyoxyalkylene glycol derivatives are poor in wear resistance and increase the wear between aluminum material and steel material in a refrigerator in an atmosphere of aforementioned refrigerant, thus causing serious problem in practical application. The frictional surfaces between aluminum material and steel material include the contact surface of a piston and piston shoe for a reciprocating compressor, and that of a vane and housing for a rotary compressor. In either case, lubrication is important for the friction surfaces.
On the other hand, the conventional extreme pressure agents which have heretofore been used in refrigerator oil impaired the stability of the oil and suffered insufficient wear-resistance effect, making themselves impossible to endure practical application.
DISCLOSURE OF INVENTION
In order to develop a refrigerator oil (lubricating oil) which is excellent in lubrication performance as well as miscibility with hydrogenated Flon refrigerant such as Flon 134a, and at the same time, effective for improving wear resistance, especially the wear resistance between aluminum material and steel material, intensive research and investigation have been made by the present inventors. As a result, it has been found that the above-mentioned purpose can be attained by compounding (a) a polyhydric alcohol partially esterified with an aliphatic acid and (b) a phosphate compound and/or phosphite compound in a polyoxyalkylene glycol and/or a specific polyester compound. The present invention has been accomplished on the basis of such a finding.
That is, the present invention provides a refrigerator oil composition for hydrogen-containing hydrofluorocarbon refrigerant which comprises at least one compound selected from (A) a polyoxyalkylene glycol derivative, and (B) polyester compounds having a kinematic viscosity at 40.degree. C. of 5 to 1000 cSt and at least two ester linkages which are compounded with (a) a polyhydric alcohol partially esterified with an aliphatic acid and (b) at least one compound selected from phosphate compounds and phosphite compounds.
Furthermore, the present invention provides a method for effecting lubrication in a compression-type refrigerator using a hydrofluorocarbon as a refrigerant characterized in that the lubrication is effected by the use of the above-mentioned refrigerator oil composition, and still furthermore, the present invention provides a compression-type refrigeration system which comprises compressor(s), the hydrogen-containing hydrofluorocarbon as a refrigerant and the above-mentioned refrigerator oil composition as a lubricating oil.
BEST MODE FOR CARRYING OUT THE INVENTION
The refrigerator oil composition according to the present invention comprises, as essential components, (A) a polyoxyalkylene glycol derivative, (B) a polyester compound having a kinematic viscosity at 40.degree. C. of 5 to 1000 cSt and at
REFERENCES:
patent: 4248726 (1981-02-01), Uchinuma et al.
patent: 4454052 (1984-06-01), Shoji et al.
patent: 4851144 (1989-07-01), McGraw et al.
patent: 4948525 (1990-08-01), Sasaki et al.
patent: 4959169 (1990-09-01), McGraw et al.
patent: 4971712 (1990-11-01), Gorski et al.
patent: 4975212 (1990-12-01), Thomas et al.
patent: 5008028 (1991-04-01), Jolley et al.
patent: 5021180 (1991-06-01), McGraw
patent: 5080816 (1992-01-01), Sakamoto et al.
patent: 5096606 (1992-03-01), Magihana et al.
patent: 5185092 (1993-02-01), Fukuda et al.
Kaneko Masato
Seiki Hiromichi
Idemitsu Kosan Co. Ltd.
Silbermann J.
Willis Jr. Prince
LandOfFree
Refrigerator oil composition for hydrogen-containing hydrofluoro does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Refrigerator oil composition for hydrogen-containing hydrofluoro, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Refrigerator oil composition for hydrogen-containing hydrofluoro will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2379010