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Refrigerating machine oil, preparation method thereof and working fluid composition for refrigerating machine

A technology of refrigeration oil and composition, applied in lubricating composition, petroleum industry, etc., can solve the problems of low mixing viscosity, affecting the reliability of compressor, compatibility of R32 refrigerant, etc., and achieve the effect of good compatibility

Inactive Publication Date: 2017-10-24
ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) Refrigeration oil widely used in HFC refrigerants is difficult to be compatible with R32 refrigerants
If the refrigerating machine oil is incompatible with the refrigerant, the evaporator of the refrigerating system will easily form stratification of the oil and the refrigerant, making it difficult for the refrigerating machine oil to flow back into the compressor of the refrigerating system, resulting in damage to the moving parts of the compressor. Lack of oil, poor lubrication, lead to wear, and then affect the reliability of the compressor operation
At the same time, the oil remaining in the evaporator will affect the heat exchange efficiency of the evaporator, thereby reducing the cooling efficiency of the refrigeration system
[0006] (2) At present, there are also refrigerating machine oils with good compatibility with R32 refrigerant, but the mixed viscosity of the working fluid composition for refrigerating machine composed of these refrigerating machine oil and R32 refrigerant is too small under the high temperature and high pressure working conditions of the refrigerating machine, Causes poor lubrication, which increases the wear and tear of the moving parts of the compressor

Method used

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  • Refrigerating machine oil, preparation method thereof and working fluid composition for refrigerating machine

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preparation example Construction

[0073] Second, the embodiments of the present invention specifically introduce the preparation method of the aforementioned refrigerating machine oil. Wherein, the preparation method mainly includes the following steps:

[0074] (1) Esterifying the polyhydric alcohol and the fatty acid to obtain an esterification reaction product.

[0075] This step is specifically as follows: Under vacuum conditions, polyhydric alcohols and fatty acids are subjected to esterification reaction under the action of a catalyst to obtain an esterification reaction product, wherein the temperature of the esterification reaction is 150-250 ° C, and the time of the esterification reaction is 5 ~15 hours.

[0076] Wherein, the molar ratio of polyhydric alcohol and fatty acid is 1:1.0~1:4.0. By further limiting the amount of polyhydric alcohol and fatty acid added, the adequacy of the esterification reaction is ensured, and the esterification rate is higher.

[0077] Preferably, the catalyst is any ...

Embodiment 1

[0091] Add 272g of pentaerythritol, 2-ethylvaleric acid and n-heptanoic fatty acid mixture 650g of mol ratio 1:1, catalyzer stannous oxalate 10g in 2 liters of three-necked flasks with thermometer, condenser tube, electric stirrer, in vacuum degree Under the conditions of -0.06MPa and temperature of 160°C, the esterification reaction was carried out for 4 hours to obtain the first-stage esterification reaction product.

[0092] The above-mentioned first-stage esterification reaction product was subjected to an esterification reaction for 5 hours at a vacuum degree of -0.08MPa and a temperature of 200°C to 240°C to obtain a second-stage reaction product, which was deacidified, washed with water, dried, and filtered Remove excess acid, catalyst, water and other mixture to obtain base oil.

[0093] Add 95% of the base oil obtained above into the mixing container, add 0.5% 2,4-di-tert-butylphenol, 2% phosphorodithioate, 0.5% glycidyl ether, 2% polyether modified silicone oil, and ...

Embodiment 2

[0095] Pentaerythritol 272g, 2-ethylpentanoic acid and n-heptanoic fatty acid mixture 650g of mol ratio 7:3, catalyzer stannous oxalate 10g are added in the 2 liters of three-necked flasks that have thermometer, condensing tube, electric stirrer, in vacuum degree Under the conditions of -0.06MPa and 170°C, the esterification reaction was carried out for 4 hours to obtain the first-stage esterification reaction product.

[0096] The above-mentioned first-stage esterification reaction product was subjected to an esterification reaction for 5 hours at a vacuum degree of -0.08MPa and a temperature of 200°C to 240°C to obtain a second-stage reaction product, which was deacidified, washed with water, dried, and filtered Remove excess acid, catalyst, water and other mixture to obtain base oil.

[0097] Add 95% of the base oil obtained above into the mixing container, add 0.5% 2,4-di-tert-butylphenol, 2% phosphorodithioate, 0.5% glycidyl ether, 2% polyether modified silicone oil, and ...

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Abstract

The invention relates to refrigerating machine oil, a preparation method thereof and a working fluid composition for a refrigerating machine. According to the main technical scheme, the refrigerating machine oil contains polyol ester and an additive, wherein the additive contains an extreme pressure anti-wear reagent, an antioxidant, an acid capturing agent and a defoaming agent; the content of polyol ester is 91.5%-99.84% of the total mass of the refrigerating machine oil; the adding amount of the extreme pressure anti-wear reagent is 0.1%-5% of the total mass of the refrigerating machine oil; the adding amount of the antioxidant is 0.05%-0.5% of the total mass of the refrigerating machine oil; and the total adding amount of the acid capturing agent and the defoaming agent is 0.01%-3% of the refrigerating machine oil. The preparation method of the refrigerating machine oil comprises the steps of carrying out esterification reaction by virtue of polyol and fatty acid, and mixing polyol ester with the additive, so as to obtain the refrigerating machine oil. The invention mainly provides the refrigerating machine oil with relatively good consistency with an R32 refrigerating agent, and the working fluid composition containing the refrigerating machine oil and the R32 refrigerating agent for the refrigerating machine has relatively good lubricating property and low-temperature fluidity.

Description

technical field [0001] The invention relates to the technical field of refrigerating machine oil, in particular to a refrigerating machine oil, a preparation method thereof and a working fluid composition for a refrigerating machine. Background technique [0002] CFC (Chlorofluorocarbons) and HCFCs (Hydrochlorofluorocarbons), conventionally used as refrigerants for refrigerating machines, are restricted in use due to the depletion of the ozone layer. Refrigerants of the HFC (Hydrofluorocarbon) type are replacing the two refrigerants of CFC and HCFC. On the other hand, among HFC refrigerants, HFC-134a, R407C, and R410A have an ozone destruction coefficient (ODP) of 0, but they have an adverse effect on global warming and have a high global warming coefficient (GWP). Therefore, refrigerants such as HFC-134a, R407C, and R410A have gradually become objects of restricted use. [0003] At present, R32 (difluoromethane) refrigerant is a chlorine-free HFC and has a low GWP, so it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/04C10N30/06C10N40/30
CPCC10M169/044C10M2201/05C10M2207/026C10M2207/042C10M2207/2835C10M2209/103C10M2215/086C10M2223/04C10M2223/047C10M2229/02C10N2030/06C10N2040/30
Inventor 廖维晓史正良郭小青单彩侠
Owner ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION
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