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Refrigeration lubricant composition

A technology of lubricating oil composition and refrigerator, which is applied in the direction of lubricating composition, petroleum industry, base materials, etc., can solve the problems of low-temperature long-term stability reduction, etc., and achieve excellent electrical insulation, low viscosity, and long-term low-temperature stability. Effect

Active Publication Date: 2006-11-29
NOF CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is well known that the esters using straight-chain fatty acids have low low-temperature long-term stability due to their crystallinity.

Method used

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  • Refrigeration lubricant composition
  • Refrigeration lubricant composition
  • Refrigeration lubricant composition

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] As for the preparation method of the ester used in the present invention, it can be prepared by any method within the range of not impairing the above-mentioned properties, and there is no particular limitation. The above esters can be produced, for example, as follows. First, mix saturated straight-chain carboxylic acids with respect to 1 equivalent of hydroxyl groups of mixed alcohols so that carboxyl groups reach 1.0 to 1.5 equivalents, or preferably 1.05 to 1.3 equivalents from the viewpoint of production efficiency and economical efficiency, and add a catalyst as needed . In a nitrogen stream, the mixture was reacted at 220-260° C. for 3-15 hours, and when the hydroxyl value reached below 2.0 mgKOH / g, the excess carboxylic acid was removed under reduced pressure. Thereafter, after deacidification with alkali, operations such as adsorption treatment with activated clay, acid clay, and synthetic adsorbent, steam processing, etc. are performed alone or in combination...

Embodiment 11

[0060] (Example 1.1: Preparation of Esters)

[0061] In a 1 liter 4-neck flask equipped with a thermometer, nitrogen inlet pipe, stirrer and condenser, the mixed alcohol and mixed carboxylic acid shown in Table 1 are charged, so that the equivalent ratio of the hydroxyl group of the mixed alcohol and the carboxyl group of the mixed carboxylic acid is 1:1.1, the reaction was carried out under normal pressure while distilling off the reaction water at 220° C. under nitrogen flow. During the reaction, the hydroxyl value was monitored, and when it dropped to 2.0 mgKOH / g, the reaction was terminated. Then, stripping was performed under a reduced pressure of 1 to 5 kPa, and unreacted carboxylic acid was removed over 1 hour. An aqueous potassium hydroxide solution was added to the obtained reaction mixture to wash with water, and the washing with water was repeated five times so that the pH of the waste water became neutral. Next, under the conditions of 100° C. and 1 kPa, the obta...

Embodiment 12～16

[0063] Except having used the mixed alcohol and mixed carboxylic acid shown in Table 1, it carried out similarly to Example 1, and obtained ester (ester B-F). The compositions of the obtained esters B to E are shown in Table 1.

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Abstract

This invention provides a lubricating oil compound used for refrigerator with low viscosity, upstanding lubricating property, and good long-term stability at low temperature, especially the lubricating oil compound used for refrigerator using non-chlorofluorocarbon cryogen. This lubricating oil compound comprises the ester made by reaction of mixed alcohol and mixed saturated straight chain carboxyl acid at specialized ratio, and the mobile viscosity of this compound at 40 DEG C is 6-28mm2 / s, the said mixed alcohol comprises 10-50mol% neopentyl glycol, 50-89mol% normosterol and 0.03-3mol% dipentaerythritol, the said mixed saturated straight chain carboxyl acid comprises 70-95mol% pentanoic acid and enanthic acid, and 5-30mol% octanoic acid.

Description

technical field [0001] The present invention relates to a lubricating oil composition for refrigerating machines, in particular to a refrigerating machine lubricating oil composition for non-chlorine Freon refrigerants, a refrigerating machine working fluid containing the lubricating oil composition, and a refrigerating device using the refrigerating machine working fluid . Background technique [0002] Chlorine-containing Freon refrigerants have been used in refrigerators, air conditioners, and the like. However, due to problems such as the destruction of the ozone layer in recent years, chlorine-containing Freon refrigerants are constantly being converted into 1,1,1,2-tetrafluoroethane (R-134a), pentafluoroethane (R-125 ), difluoroethane (R-32), and these mixed solvents and other non-chlorinated Freon refrigerants. Accordingly, various lubricating oils for refrigerators (hereinafter referred to as refrigerator oils) using polyol esters having high compatibility with non-...

Claims

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Application Information

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IPC IPC(8): C10M105/42C10N40/30
CPCC10M105/32C10M171/008C10N2020/097C10N2040/30
Inventor 山田宗宏加治木武静延彦
Owner NOF CORP
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