초록 ▼

There are disclosed refrigeration working fluid compositions comprising R125 (pentafluoroethane) or R152a (1,1-difluoroethane) refrigerants and certain polyol esters of C7 to C10 branched alkanoic acids or mixtures of such branched acids with linear C7 to C10 monoalkanoic acids. The polyols are neop

There are disclosed refrigeration working fluid compositions comprising R125 (pentafluoroethane) or R152a (1,1-difluoroethane) refrigerants and certain polyol esters of C7 to C10 branched alkanoic acids or mixtures of such branched acids with linear C7 to C10 monoalkanoic acids. The polyols are neopentylglycol, technical grade pentaerythritol and trimethylolpropane; the esters exhibit suitable viscosity ranges and miscibility with refrigerants over a broad compositional range. The acids have a defined average effective carbon chain length in order to be miscible with the refrigerants over the range of 5 to 55 wt. % ester lubricant.

대표청구항 ▼

A refrigeration working fluid comprising about 5 to 55 pans by weight of a synthetic polyol ester lubricant and about 95 to 45 parts by weight of 1,1-difluoroethane refrigerant, the ester having a viscosity range of from about 8 cSt. to 130 cSt. at 40°C. and the working fluid having a miscibility va

A refrigeration working fluid comprising about 5 to 55 pans by weight of a synthetic polyol ester lubricant and about 95 to 45 parts by weight of 1,1-difluoroethane refrigerant, the ester having a viscosity range of from about 8 cSt. to 130 cSt. at 40°C. and the working fluid having a miscibility value of -20°C. or less, said miscibility value being the highest temperature at which immiscibility occurs over the composition range of said working fluid, wherein said ester is prepared by reacting: neopentylglycol, trimethylolpropane or technical grade pentaerythritol, defined as containing 85 to 92% by weight monopentaerythritol, 14 to 7% by weight dipentaerythritol and up to 2% by weight tripentaerythritol, with an acid mixture consisting of branched C7 to C10 alkyl monocarboxylic acids, and linear C7 to C10 alkyl monocarboxylic acids, said acid mixture having an average effective carbon chain length less than 8.0 and containing at least 25 weight % of said branched acids and up to 75 weight % of said linear acids. A refrigeration working fluid comprising about 5 to 55 parts by weight of a synthetic polyol ester lubricant and about 95 to 45 pans by weight of pentafluoroethane refrigerant, the ester having a viscosity can be of from about 8 est. to 130 est. at 40°C. and the working fluid having a miscibility value of -20°C. or less, said miscibility value being the highest temperature at which immiscibility occurs over the composition range of said working fluid, wherein said ester is prepared by reacting: (i) technical grade pentaerythritol, defined as containing 85 to 92% by weight monopentaerythritol, 14 to 7% by weight dipentaerythritol and up to 2% by weight tripentaerythritol, an acid mixture consisting of branched C7 to C10 alkyl monocarboxylic acids and linear C7 to C10 monocarboxylic acids, said acid mixture having an average effective carbon chain length less than 7.2 and containing at least 25 weight % of said branched acids and up to 75 weight % of said linear acids, or. (ii) trimethylolpropane or neopentyl glycol with an acid mixture consisting of branched C7 to C10 alkyl monocarboxylic acids and linear C7 to C10 alkyl monocarboxylic acids, said acid mixture having an average effective carbon chain length less than 8.0 and containing at least 25 weight % of said branched acids and up to 75 weight % of said linear acids.