Lubricants for refrigeration compressors
AssigneeThe Dow Chemical Company
InventorsPhilip W. McGraw, Eldon L. Ward
Life of this patent
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Abstract
Lubricant base compositions for compression refrigeration are composed of 95 to 5% by weight of polyether polyols having a number average molecular weight from about 400 to about 5000 and 5 to 95% of esters made from polyhydric alcohols with alkanoic acids or esters made from alkanedioic acids with alkanols. A refrigeration fluid is made from the base composition with the addition of selected hydrochlorofluorocarbons and hydrofluorocarbons so that the base composition is miscible with the refrigerant in the range from -20.degree. C. to greater than 65.degree. C.
Claims15
A lubricant composition miscible in hydrofluorocarbon and hydrochlorofluorocarbon refrigerants in the range from -20.degree. to greater than 65.degree. C. and having a viscosity greater than 75 centistokes at 38.degree. C. comprising:
- (A) about 95 to 5% of a polyether polyol which has the formula
- Z-[(CH.sub.2 --CH(R.sub.1)--O--).sub.n --(CH.sub.2 --CH(CH.sub.3)--O--).sub.m --R.sub.2 ].sub.p
- where
- Z is the residue of a compound having 1-8 active hydrogens,
- R.sub.1 is hydrogen, ethyl, or mixtures thereof,
- n is 0 or a positive number,
- m is a positive number,
- n+m is a number having a value which will give a polyether polyol with a number average molecular weight range from about 400 to about 5000,
- R.sub.2 is hydrogen or an alkyl group of 1 to 6 carbon atoms,
- p is an integer having a value equal to the number of active hydrogens of Z, and
- (B) about 5 to 95% of an ester selected from the group consisting of
- (1) esters made from polyhydric alcohols with alkanoic acids, and
- (2) esters made from alkanedioic acids with alkanols.
A lubricant composition miscible in hydrofluorocarbon and hydrochlorofluorocarbon refrigerants in the range from -20.degree. to greater than 65.degree. C. and having a viscosity greater than 75 centistokes at 38.degree. C. comprising:
- (A) about 95 to 5% of a polyether polyol which has the formula
- Z--[(--CH.sub.2 --CH(CH.sub.3)--O--).sub.n --R].sub.p
- where
- Z is the residue of a compound having 1-8 active hydrogens,
- n is a number having an average value which will give a polyether polyol with a number average molecular weight range from about 400 to about 5000,
- R is hydrogen or an alkyl group of 1 to 6 carbon atoms,
- p is an integer having a value equal to the number of active hydrogens of Z, and
- (B) about 5 to 95% of an ester selected from the group consisting of
- (1) esters made from polyhydric alcohols with alkanoic acids, and
- (2) esters made from alkanedioic acids with alkanols.
A fluid composition for use in compression refrigeration comprising
- (A) a refrigerant selected from the group consisting of hydrochlorofluorocarbons and hydrofluorocarbons, and
- (B) a lubricant composition which comprises
- (1) about 95 to 5% of a polyether polyol which has the formula
- Z--[(CH.sub.2 --CH(R.sub.1)--O--).sub.n --(CH.sub.2 --CH(CH.sub.3)--O--).sub.m --R.sub.2 ].sub.p
- where
- Z is the residue of a compound having 1-8 active hydrogens,
- R.sub.1 is hydrogen, ethyl, or mixtures thereof.
- n is 0 or a positive number,
- m is a positive number,
- n+m is a number having a value which will give a polyether polyol with a number average molecular weight range from about 400 to about 5000,
- R.sub.2 is hydrogen or an alkyl group of 1 to 6 carbon atoms,
- p is an integer having a value equal to the number of active hydrogens of Z, and
- (2) about 5 to 95% of an ester selected from the group consisting of
- (a) esters made from polyhydric alcohols with alkanoic acids, and
- (b) esters made from alkanedioic acids with alkanols.
A fluid composition for use in compression refrigeration comprising
- (A) a refrigerant selected from the group consisting of hydrochlorofluorocarbons and hydrofluorocarbons, and
- (B) a lubricant composition which comprises
- (1) about 95 to 5% of a polyether polyol which has the formula
- Z--[(--CH.sub.2 --CH(CH.sub.3)--O--).sub.n --R].sub.p
- where
- Z is the residue of a compound having 1-8 active hydrogens,
- n is a number having an average value which will give a polyether polyol with a number average molecular weight range from about 400 to about 5000,
- R is hydrogen or an alkyl group of 1 to 6 carbon atoms,
- p is an integer having a value equal to the number of active hydrogens of Z, and
- (2) about 5 to 95% of an ester selected from the group consisting of
- (a) esters made from polyhydric alcohols with alkanoic acids, and
- (b) esters made from alkanedioic acids with alkanols.
Dependencies are inferred from the claim text.