Lubricating oil composition for refrigerator

A technology of lubricating oil composition and refrigerator, applied in lubricating composition, petroleum industry, materials for heat exchange, etc., can solve problems such as low temperature stability research and manufacturing difficulties, and achieve long-term low temperature stability and good lubricity. , the effect of low viscosity

Active Publication Date: 2015-07-29
NOF CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mixed esters obtained by combining polyhydric alcohols and specific carboxylic acids described in Patent Documents 1 and 2 have not been sufficiently studied for maintaining low-temperature stability over a long period of time.
[0008] Therefore, refrigerating machine oils with excellent low-temperature stability, low viscosity, and high electrical insulation (high volume resistivity) are desired, but their production is difficult as described above.

Method used

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  • Lubricating oil composition for refrigerator
  • Lubricating oil composition for refrigerator
  • Lubricating oil composition for refrigerator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0051] The present invention will be specifically described below using examples.

[0052] The test methods for the esters prepared in the present examples and comparative examples are described below:

[0053] According to JIS K-2283, the kinematic viscosity at 40 degreeC and 100 degreeC was measured using the Cannon-Fenske viscometer, and the viscosity index was calculated.

[0054] Measured based on JIS C-2101.

[0055] Measured in accordance with JIS K-0070.

[0056] Measured based on JOCS 2.2.1.4-1996.

[0057] According to JIS C-2101, the volume resistivity (TΩ·m) at 25 degreeC was measured.

[0058] Measured in accordance with JIS K-2269.

[0059] Seal 400g of the sample with the water content below 100ppm into a stainless steel square tank, place it in a low-temperature storage at -28°C for 1000 hours, and observe whether there is crystallization by visual method.

[0060] Add 0.6g of sample (ester) and 2.4g of refrigerant R-134a with dry ice to a thick-wa...

Synthetic example 1

[0063] Synthesis Example 1: Preparation of Esters

[0064] Put the mixed alcohol shown in Table 1 and the saturated monocarboxylic acid into the 1 liter 4-necked flask that has installed thermometer, nitrogen introduction pipe, stirrer and cooling pipe, the equivalent ratio of the hydroxyl group of mixed alcohol and the carboxyl group of saturated monocarboxylic acid is 1:1.1, under a nitrogen flow, the reaction was carried out under normal pressure at 220° C. while distilling off the reaction water. The hydroxyl value was monitored during the reaction, and the reaction was stopped when it was lower than 2.0 mg KOH / g. Thereafter, stripping was performed under a reduced pressure of 1 to 5 kPa to remove unreacted carboxylic acid over 1 hour. Aqueous potassium hydroxide solution was added to the obtained reaction mixture to wash with water. The water washing process was repeated 5 times to make the pH of the drain water neutral. Then, the obtained ester layer was dehydrated un...

Synthetic example 2～7

[0066] Esters (esters B to G) were obtained in the same manner as in Example 1, except that the mixed alcohols and saturated monocarboxylic acids shown in Table 1 were used. For each ester, the kinematic viscosity at 40°C and 100°C was measured by the method described above. The results are shown in Table 1 together.

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Abstract

The invention provides a refrigeration lubricant composition which with low viscosity, high volume intrinsic resistance and good low-temperature stability. The lubricating oil composition for refrigerators is mainly composed of a mixed ester obtained from a mixed alcohol and a 5-10C saturated monocarboxylic acid, the mixed alcohol comprising 1-90 mol% of neopentyl glycol, 10-80 mol% of pentaerythritol and 0.01-20 mol% of dipentaerythritol and satisfying the relational equation: 0.2<=[(mol% of pentaerythritol) / (mol% of neopentyl glycol * mol% of dipentaerythritol)]<=7.0, and has a kinematic viscosity at 40[deg.]C of 6-28 mm<2> / s.

Description

[0001] This application is a divisional application of the Chinese application with the application number CN200510128944.8 (the application date is December 2, 2005) and the invention name is "lubricating oil composition for refrigerator". technical field [0002] The present invention relates to a lubricating oil composition for refrigerating machines, specifically a lubricating oil composition for refrigerating machines for chlorofluoroalkane-free refrigerants, a refrigerating machine working fluid containing the lubricating oil composition, and a refrigerating machine using the refrigerating machine working fluid freezer. Background technique [0003] Chlorine-containing halothane refrigerants are used in refrigerators, air conditioners, etc. However, in recent years, due to problems such as damage to the ozone layer, 1,1,1,2-tetrafluoroethane (R-134a), pentafluoroethane (R-125), difluoroethane (R-32) and these It is a trend to replace chlorine-containing halothane refr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M105/34C10N40/30
CPCC09K5/045C10M105/44C10M171/008C10N2040/30C10N2020/097
Inventor 山田宗宏静延彦
Owner NOF CORP
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