Refrigerator oil composition

Abstract

The invention relates to a refrigerator oil composition. According to the invention, deep hydrorefined cycloalkane-based base oil and / or paraffin-based mineral oil is adopted as a base oil; a sulfur type, a phosphorus type or a sulfur-phosphorous type anti-scuff agent which takes 1.0-2.5% of every gram of the base oil by weight, and a silicon type, a non-silicon type or a composite type anti-foaming agent which takes 5-25mug of every gram of the base oil by weight are added to the base oil. The refrigerator oil composition provided by the invention has a good pour point depression and dewaxing effect, an excellent fluidity, and a low wax precipitation tendency. A pour point of the base oil with a kinematical viscosity of 35-45mm<2> / s under a temperature of 40 DEG C can be lower than -45 DEG C, and a floc point can be reduced to a value below -42 DEG C. Therefore, heat transferring efficiency reduction caused by refrigerator oil retention at low-temperature positions such as a compressor expansion valve or an evaporator can be prevented. The refrigerator oil composition has sulfur and nitrogen content below 10ppm, a %CA value close to 0, arene content below 1%, and excellent heat / chemical stability and corrosion resistance. With the refrigerator oil composition, a high-power air-conditioner compressor with R22 (monochlorodifluoromethane) as a refrigeration agent can stably operate for a long time.

Description

technical field [0001] The invention relates to a refrigerating machine oil composition, in particular to a refrigerating machine oil composition used in an air-conditioning compressor refrigeration system using R22 as a refrigerant. Background technique [0002] Refrigeration oil is a special lubricating oil for refrigeration compressors. It plays the role of lubrication, sealing and heat dissipation during the operation of the compressor. It is an important component in the refrigeration system that determines and affects the function and effect of the refrigeration device. As refrigeration compressors tend to be more efficient and energy-saving, higher requirements are placed on the thermal / chemical stability, low temperature performance, lubricity, and viscosity-temperature performance of refrigeration oil. At present, the commonly used mineral type refrigerating machine oil products are mainly moderately refined by combined processes such as solvent refining, hydrogenat...

AI Technical Summary

Problems solved by technology

In addition, the low-temperature performance of refrigerating machine oil includes not only low-temperature fluidity, but also the tendency of low-temperature wax precipitation (ie, flocculation point). If the effect of dewaxing and decondensation of mineral oil is limited, refrigerating machine oil will produce flocs at low temperatures, resulting in capillary and expansion valves. Blockage, which interrupts the refrigerant cycle

[0008] The mineral-type refrigerating machine oil base oils involved in the prior art mainly use solvent extraction, solvent deasphalting, solvent dewaxing, hydrogenation treatment, contact dewaxing, hydrofining, sulfuric acid washing, clay treatment, etc. or a combination of two or more Due to the influence of raw material oil properties and limited refining depth, the resulting refrigerating machine oil base oil has high sulfur, nitrogen and aromatic content and low pour point, which will affect the thermal-chemical stability and stability of refrigerating machine oil. Low temperature performance is adversely affected

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