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A technology of refrigerant and refrigerating machine oil, used in additives, petroleum industry, materials for heat exchange, etc., which can solve the problems of increasing refrigerant filling amount, decreasing lubricant concentration, and inability to ensure lubricity.
Inactive Publication Date: 2006-08-09
JAPAN ENERGY CORP
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[0004] However, due to the high solubility of hydrocarbon refrigerants in lubricants such as mineral oil, the concentration of the lubricant decreases after using the above-mentioned lubricants, and the lubricity cannot be ensured. Moreover, the filling amount of the refrigerant needs to be increased.
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[0008] Examples of neopentyl polyols having 5 to 10 carbon atoms in the present invention include neopentyl glycol, pentaerythritol, trimethylolpropane, dipentaerythritol, trimethylolethane, trimethylolbutane and the like. Neopentyl polyols with more than 10 carbon atoms have too large a hydrocarbon part, and the compatibility and solubility of the synthesized ester with the hydrocarbons of the refrigerant are increased, and the object of the present invention cannot be achieved. For the purposes of the present invention, neopentyl glycol and pentaerythritol are particularly preferred.
[0009] In the present invention, examples of linear monobasic fatty acids having 5 to 9 carbon atoms include n-heptanoic acid, n-hexanoic acid, n-octanoic acid, and n-nonanoic acid. Branched-chain monobasic fatty acids include all isomers of the aforementioned straight-chain acids, but for moderate compatibility, solubility and best lubricity, 2-ethylhexanoic acid, 3,5,5-trimethylhexanoic acid...
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Abstract
To provide a refrigerating machine oil which has appropriate compatibility with and solubility in a hydrocarbon refrigerant, can maintain a viscosity which does not adversely affect its lubricity, can reduce the filling amount of the refrigerant and, in addition, has excellent lubricity, electrical insulating properties, stability and the like. The refrigerating machine oil for a hydrocarbon refrigerant comprises an ester of one or more kinds of a 5-10C neopentyl polyol with one or more kinds selected from a 5-9C linear or branched monovalent fatty acid as the major component.
Description
technical field [0001] The present invention relates to refrigerating machine oils using hydrocarbons (for example, ethane, propane, butane, isobutane, etc.) as refrigerants. Background technique [0002] Conventionally, in refrigerators, air conditioners, refrigerators, etc., fluorine refrigerants (for example, trichlorofluoromethane (R-11), dichlorodifluoromethane, etc.) that use fluorine and chlorine as constituent elements (R-12), chlorodifluoromethane (R-22) of the chlorofluorocarbon (HCFC) type, etc.) as a refrigerant. However, their production and use have recently been restricted internationally due to their association with the ozone layer depletion problem, and now they are being replaced by, for example, difluoromethane (R-32), tetrafluoroethane (R-134 or R-134a), etc. Chlorine-free, hydrogen-containing fluorine refrigerant replacement. However, although these HFCs do not destroy the ozone layer, they are not excellent refrigerants fr...
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