WO2016206246A1 - Base oil for refrigeration oil composition, refrigeration oil composition and composition for cooling - Google Patents

Abstract

A base oil for a refrigeration oil composition and refrigeration oil composition. The base oil comprises an alkylbenzene oil and an ester oil. The ratio of the 120˚C kinetic viscosity of the base oil to the 40˚C kinetic viscosity thereof is 0.23-0.30. A base oil having a viscosity overly decreasing with the increase of the temperature is formed by combining an alkylbenzene oil and an ester oil having a low viscosity and high viscosity index for use and adjusting the ratio of the 120˚C kinetic viscosity of the base oil to the 40˚C kinetic viscosity thereof.

Description

Base oil and refrigerating machine oil composition for refrigerating machine oil composition and composition for refrigeration Technical field

The present invention relates to the field of refrigeration oils, and in particular to a base oil and a refrigerating machine oil composition for a refrigerating machine oil composition and a composition for refrigerating.

Background technique

The compression refrigeration system consists of a refrigeration compressor, a condenser, an expansion valve, an evaporator, etc. The working principle is to absorb the heat of the surrounding medium when the refrigerant is vaporized and volatilized, to lower the temperature for cooling, and then to pass the refrigerant through the compressor. Revert to liquid, re-gasification, and so on. This kind of refrigeration system is widely used in household appliances such as refrigerators and air conditioners, industrial equipment such as cold storage and cold storage rooms, and commercial equipment such as display cabinets, beverages, and ice cream machines. The compressor is the heart of the above-mentioned compression refrigeration system, and the refrigeration oil that acts as lubrication, heat dissipation, sealing and anti-corrosion in the compressor has a very important influence on the performance and life of the compressor and the refrigeration system, so the performance is selected. Excellent refrigeration oil is very important for compression refrigeration systems.

As China's environmental problems become more and more prominent, protecting the environment has become an important issue facing all walks of life. For the home appliance industry using this compression refrigeration system, achieving energy conservation and emission reduction is an important means of protecting the environment. In order to achieve the purpose of energy saving and emission reduction, those skilled in the art often achieve the purpose of reducing friction and saving energy by selecting a refrigerating machine oil having a lower viscosity and better compatibility with a refrigerant.

CN 1099454 A discloses a hydrocarbon-containing refrigerator oil composition comprising a hydrocarbon oil as a base oil selected from at least one of a mineral oil, an olefin polymer, a naphthalene compound and an alkylbenzene. The olefin polymer comprises a C ₁₆ -C ₂₀ alpha olefin oligomer, which comprises a Ziegler catalyst method, a radical polymerization method, an aluminum chloride method, a boron fluoride by using ethylene as a raw material. A known polymerization method such as a method is obtained by oligomerization. The α-olefin polymer obtained by this method generally has a viscosity at 40 ° C of more than 6 mm 2 /sec and is 6.5 to 8.0 mm 2 /sec, making it difficult to obtain a lower viscosity oil.

Generally, the lower the viscosity of the refrigerating machine oil, the better the low-temperature fluidity, and the better the energy saving effect. Therefore, in order to achieve energy saving and emission reduction, some people have tried to produce a low-viscosity refrigeration oil by cutting a suitable fraction with naphthenic mineral oil. Although the viscosity of this oil can reach a low viscosity of 5 mm 2 / sec at 40 ° C, the flash point and ignition point of this oil are too low, and the safety is poor. It is difficult to reach the minimum flash point of the refrigeration compressor to the refrigerating machine oil (greater than The requirement of 140 ° C), together with the wide fraction and high volatility of this oil, makes it easy to carry oil in the compressor.

Moreover, for refrigerating machine oil, the lower the viscosity, the better the low-temperature fluidity, and the better the energy saving effect. In many cases, even if a refrigerating machine oil composition having a low viscosity and a good low-temperature fluidity is selected, there is a case where the cooling efficiency does not rise and fall. It can be seen that in the process of selecting the refrigerating machine oil, it is not only possible to consider the viscosity of the refrigerating machine oil at a low temperature (100 ° C or less), and further to optimize the performance of the refrigerating machine oil.

In short, there is currently no low-viscosity refrigeration oil that is ideal for energy saving. Therefore, there is an urgent need to develop a low viscosity refrigerator oil composition product capable of further increasing the energy saving rate.

Summary of the invention

An object of the present invention is to provide a base oil and a refrigerating machine oil composition for a refrigerating machine oil composition and a composition for refrigerating to reduce the viscosity of the refrigerating machine oil while improving the viscosity-temperature characteristics thereof, thereby achieving energy saving and emission reduction. The purpose of protecting the environment.

In order to achieve the above object, in one aspect of the invention, there is provided a base oil for a refrigerating machine oil composition, the base oil comprising an alkyl benzene oil and an ester oil, and the base oil has a kinematic viscosity at 120 ° C and a kinematic viscosity at 40 ° C The ratio is 0.23-0.30.

In another aspect of the invention, there is provided a refrigerating machine oil composition comprising a base oil and an additive, wherein the base oil is a base oil for the above refrigerating machine oil composition.

In still another aspect of the present invention, there is provided a composition for refrigeration, the composition comprising a refrigerating machine oil composition and a refrigerant, wherein the refrigerating machine oil composition is the above refrigerating machine oil composition.

The base oil and refrigerating machine oil composition for a refrigerating machine oil composition according to the above aspect of the present invention and the composition for refrigerating are advantageously obtained by using an alkyl benzene oil to obtain a base oil having a low viscosity and excellent overall performance, and at the same time, by using an alkyl group The benzene oil is used in combination with the low viscosity and high viscosity index ester oil, and by adjusting the ratio of the kinematic viscosity of the base oil to 120 ° C and the kinematic viscosity at 40 ° C, the viscosity is not excessively formed as the temperature increases. Reduced base oil. Further, in the case of ensuring low oil viscosity at low temperature (under low viscosity tendency), by increasing the viscosity-temperature characteristics, the thickness of the oil film at a high temperature is increased, the boundary lubricity and sealing property are improved, and the COP value of the compressor refrigeration efficiency is further improved. In the end, it will achieve the goal of energy saving and environmental protection.

Other features and advantages of the invention will be described in detail in the detailed description which follows.

detailed description

Specific embodiments of the present invention will be described in detail below. It is to be understood that the specific embodiments described herein are merely illustrative and not restrictive.

In the present invention, the term "viscosity" means "kinetic viscosity", and "kinetic viscosity" refers to the ratio of the dynamic viscosity of a fluid to the density of the fluid at the same temperature; in the present invention, it is based on the national standard GB/T 265-1988. The kinematic viscosity measurement method is measured. The term "viscosity index" refers to the extent to which the viscosity of all fluids varies with temperature. The higher the viscosity index, the smaller the viscosity of the fluid is affected by the temperature, and the less sensitive the viscosity is to temperature; in the present invention, it is measured according to the viscosity index calculation method of the petroleum product GB/T 1995-1998.

As described in the background section, there is currently no low-viscosity refrigeration oil that is ideal for energy savings. Therefore, there is an urgent need to develop a low viscosity refrigerator oil composition product capable of further increasing the energy saving rate. In response to this situation, the inventors of the present invention conducted a large number of research experiments. At an accidental opportunity, the inventors found that it is not a viscosity for refrigerating machine oil. The lower the lower the low temperature fluidity, the better the energy saving effect. In some parts of the compressor, such as friction pairs and piston rods, the temperature is often as high as 120 ° C. As the temperature increases, the viscosity of the refrigeration oil will become lower. Not only has it not become lower, but there has been an upward trend. This phenomenon may occur because, as the viscosity of the refrigerating machine oil decreases, the oil film at the friction pair and the piston connecting rod becomes thinner, and the oil film is too thin to cause a decrease in sealing performance, which affects the cooling efficiency, resulting in a cooling efficiency that does not rise and fall. . In addition, too low a thickness of the oil film may cause a decrease in boundary lubricity or even dry friction of the compressor components, resulting in damage to the compressor.

For this reason, in the process of developing the refrigerating machine oil, the inventors of the present invention have considered the viscosity of the refrigerating machine oil at a low temperature (100 ° C or lower), and further considered the viscosity of the refrigerating machine oil at a high temperature (above 100 ° C). A base oil for a refrigerating machine oil composition. The base oil contains an alkylbenzene oil and an ester oil, and the ratio of the kinematic viscosity at 120 ° C of the base oil to the kinematic viscosity at 40 ° C is 0.23-0.30.

The base oil for the above-mentioned refrigerating machine oil composition of the present invention is advantageous for obtaining a base oil having a low viscosity and excellent comprehensive performance by using an alkyl benzene oil, and at the same time by synergizing an alkyl benzene oil with a low viscosity, high viscosity index ester oil. By using, and by adjusting the ratio of the obtained base oil 120 ° C kinematic viscosity to 40 ° C kinematic viscosity, it is advantageous to form a base oil which does not excessively decrease in viscosity with an increase in temperature. Further, in the case of ensuring low oil viscosity at low temperature (under low viscosity tendency), by increasing the viscosity-temperature characteristics, the thickness of the oil film at a high temperature is increased, the boundary lubricity and sealing property are improved, and the COP value of the compressor refrigeration efficiency is further improved. In the end, it will achieve the goal of energy saving and environmental protection.

Meanwhile, in the base oil for the above-mentioned refrigerating machine oil composition of the present invention, by adding a polar component (ester oil), the content of the hydrocarbon refrigerant to be used in combination with the liquid refrigerant in the liquid phase may be lowered to some extent. The content of the hydrocarbon refrigerant used in the gas phase, which will increase the pressure of the hydrocarbon refrigeration system, which is beneficial to improve the efficiency of the refrigeration system (about 0.5% to 1%), which is beneficial to achieve The effect of energy saving.

In addition, the present invention adjusts the viscosity of the base oil by adjusting the ratio of the kinematic viscosity at 120 ° C to the kinematic viscosity at 40 ° C to effectively adjust the viscosity of the base oil, and the viscosity of the oil at 100 ° C is less than 2 mm ² / After s, the viscosity index is difficult to get. While simplifying the detection steps of the base oil during the adjustment process, the base oil meeting the requirements of the present invention is more accurately described.

According to the present invention, the object of the present invention can be achieved as long as the ratio of the base oil 120 ° C kinematic viscosity to the 40 ° C kinematic viscosity is in the range of 0.23 - 0.30. However, in order to further optimize the viscosity-temperature characteristics of the base oil of the present invention, in a preferred case, the base oil has a kinematic viscosity at 40 ° C of 2-15 mm ² /s, and the base oil has a kinematic viscosity of 120 ° C and a movement of 40 ° C. The viscosity ratio is 0.24-0.29.

More preferably, the base oil has a kinematic viscosity at 40 ° C of 3 to 7 mm ² /s, and when the base oil has a kinematic viscosity at 40 ° C of 3 to 5 mm ² /s, the ratio of the kinematic viscosity at 120 ° C to the kinematic viscosity at 40 ° C is 0.24 to 0.29; when the kinematic viscosity of the base oil at 40 ° C is more than 5 to less than or equal to 7 mm ² /s, the ratio of the kinematic viscosity at 120 ° C to the kinematic viscosity at 40 ° C is 0.23 to 0.28.

According to the present invention, as long as the base oil contains both an alkylbenzene oil and an ester oil, and the above requirements are satisfied, there is no particular requirement for the amount of the alkylbenzene oil and the ester oil. However, in order to balance the solubility of the above-mentioned base oil with a hydrocarbon refrigerant during use, the viscosity-temperature characteristics of the refrigeration composition containing the base oil, and the thickness of the ink. In a preferred aspect of the present invention, the content of the alkyl benzene oil is 40-80 wt.%, and the content of the ester oil is 20-60 wt.%, based on the total amount of the above base oil, preferably an alkyl benzene oil. The content is 40-75 wt.%, and the content of the ester oil is 25-60 wt.%.

Although the base oil satisfying the above conditions can attain the object of the present invention, the inventors of the present invention have found that when the ester oil selected for the base oil has a viscosity in the range of ² to 15 mm ² /s and a viscosity index of more than 90, The viscosity-temperature characteristics of the refrigerating machine oil obtained using the base oil can be further improved. Accordingly, in the present invention, it is preferred that the above ester oil has a kinematic viscosity at 40 ° C of ² to 15 mm ² /s, more preferably 8 to ¹⁵ mm ² /s, and the ester oil has a viscosity index of more than 90, more preferably more than 120.

In accordance with the present invention, one skilled in the art can select any ester oil that meets the above requirements to obtain the base oil of the present invention. In a preferred embodiment of the present invention, the ester oils usable in the above base oils include, but are not limited to, C ₆ -C ₁₄ monohydric alcohol esters, C ₈ -C ₁₈ monobasic acid esters, C ₄ -C ₁₂ a monool ester, a C ₄ -C ₁₂ dibasic acid ester, a C ₃ -C ₆ polyhydric alcohol ester, a C ₃ -C ₆ polybasic acid ester, and a polyalkyleneoxy ether monoester having a specific structural formula and a polyalkylene oxide One or more of the ether diesters.

Preferably, the above C ₆ -C ₁₄ monool ester refers to an ester synthesized from a monohydric alcohol having a total of 6-14 carbon atoms, including but not limited to a monohydric alcohol selected from the group consisting of isohexanol, isoheptanol, and isooctanol. , C ₁ -C ₆ acid esters of isodecyl alcohol, isodecyl alcohol and isotridecyl alcohol. Wherein the C ₁ -C ₆ acid is formic acid, acetic acid, propionic acid, butyric acid, valeric acid or caproic acid. In a more preferred case, the above C ₆ -C ₁₄ monool esters include, but are not limited to, isotridecyl esters, isodecyl alcohol esters, isodecyl alcohol esters, isooctanol esters, isoheptyl esters, and isohexyl alcohol esters. One or more.

Preferably, the above C ₈ -C ₁₈ monobasic acid ester refers to an ester synthesized from a monobasic acid having a total number of carbon atoms of 8-18, including but not limited to C ₁ -C ₈ positive of C ₁₀ -C ₁₈ monobasic fatty acid. The or isomeric alcohol ester preferably includes, but is not limited to, a C ₁ -C ₈ normal or isomeric alcohol ester of a monobasic acid selected from the group consisting of citric acid, dodecanoic acid, myristic acid, palmitic acid or octadecanoic acid. Wherein C ₁ -C ₈ normal or isomeric alcohols include, for example but are not limited to, methanol, ethanol, propanol, butanol, pentanol, hexanol, heptanol or octanol. In a more preferred case, the above C ₈ -C ₁₈ monobasic acid ester includes, but is not limited to, di(2-ethylhexyl) dodecanoate, di(2-ethylhexyl) phthalate, methyl stearate. One or more of isobutyl laurate and isoamyl laurate.

Preferably, the above C ₄ -C ₁₂ glycol ester refers to an ester synthesized from a glycol having a total number of carbon atoms of 4 to 12, which includes but is not limited to a glycol selected from its own diol and methyl hexane. a C ₅ -C ₁₀ normal or isomeric acid ester of an alcohol, neopentyl glycol or 1,10-decanediol; wherein the C ₅ -C ₁₀ normal or isomeric acid, for example including but not limited to valeric acid , hexanoic acid, heptanoic acid, octanoic acid, citric acid or citric acid. In a more preferred case, the above C ₄ -C ₁₂ glycol esters include, but are not limited to, 3-methyl-1,6-ethylene glycol di-n-octanoate, 1,10-nonanediol di(2- One or more of ethylhexyl)ester and hexanediol diisooctanoate.

Preferably, the above C ₄ -C ₁₂ dibasic acid ester refers to a monoester and/or diester synthesized from a dibasic acid having a total number of carbon atoms of 4 to 12, which includes, but is not limited to, a dibasic acid selected from the group consisting of a C ₄ -C ₁₀ normal or isomeric alcohol ester of a diacid, adipic acid, pimelic acid, sebacic acid, sebacic acid or phthalic acid, wherein the C ₄ -C ₁₀ normal or isomeric alcohol, For example, including but not limited to, one or more of butanol, pentanol, hexanol, heptanol, octanol, decyl alcohol, and decyl alcohol; in a more preferred case, the above C ₄ -C ₁₂ dibasic acid ester includes But not limited to di-n-octyl adipate, di-n-octyl 3-methyladipate, di(2-ethylhexyl) adipate, m-cyclohexyl di(2-ethyl) adipate One or more of hexyl)ester, adipic acid p-methylcyclohexyl bis(2-ethylhexyl) ester, di(2-ethylhexyl) sebacate, and di-n-butyl sebacate.

Preferably, the above C ₃ -C ₆ polyol ester is a monoester, diester and/or polyester synthesized from a polyol having a hydroxyl functional group of 3-6, including but not limited to a polyol selected from the group consisting of a C ₄ -C ₁₀ normal or isomeric acid ester of a triol, trimethylolpropane or pentaerythritol, wherein the C ₄ -C ₁₀ normal or isomeric acid, for example but not limited to butyric acid, valeric acid, One or more of acid, heptanoic acid, octanoic acid, citric acid, and citric acid. In a more preferred case, the above C ₆ -C ₂₀ polyol esters include, but are not limited to, glycerol trihexanoate, pentaerythritol tetrahexanoate, trimethylolpropane trihexanoate, and trimethylolpropane One or more of valerate.

Preferably, the above C ₃ -C ₆ polyacid ester is an ester synthesized from a polybasic acid having a carboxyl functional group of 3-6, including but not limited to a polybasic acid selected from the group consisting of trimellitic acid and pyromellitic acid. C ₄ -C ₁₀ normal or isomeric alcohol esters, wherein C ₄ -C ₁₀ normal or isomeric alcohols include, but are not limited to, for example, butanol, pentanol, hexanol, heptanol, octanol, decyl alcohol or hydrazine alcohol.

Preferably, the above polyalkoxy ether monoester is a polyalkyleneoxy ether monoester having the following structural formula,

Wherein n ₁ is an integer in 0 or 1-3, n ₂ is an integer in 1-3, and R ₁ is in C ₄ H ₉ -, C ₅ H ₁₁ , C ₆ H ₁₃ -, and C ₇ H ₁₅ - In one case, the R ₂ is one of C ₁₁ H ₂₃ -, C ₆ H ₁₃ -, C ₇ H ₁₅ -, C ₈ H ₁₇ -, C ₉ H ₁₉ - and C ₁₀ H ₂₁ -, Preferably, the above polyalkoxy ether monoester has the following structural formula:

Preferably, the above polyalkoxy ether diester is a polyalkyleneoxy glycol double having the following structural formula ester,

Wherein m is an integer in 1-3, and R ₃ and R ₄ are each independently selected from the group consisting of C ₆ H ₁₃ -, C ₇ H ₁₅ -, C ₈ H ₁₇ -, C ₁₉ H ₁₉ - and C ₁₀ H ₂₁ - One kind. In a more preferred case, the above polyalkoxy ether diester has the following structural formula:

Although the base oil satisfying the above conditions can attain the object of the present invention, the inventors of the present invention have found that when the above-mentioned alkylbenzene oil has a kinematic viscosity at 40 ° C of ² to 15 mm ² /s, the use of the alkylbenzene is contained. The viscosity of the refrigerating machine oil obtained from the base oil of the oil is better in accordance with the application requirements. Accordingly, in the present invention, it is preferred that the above alkylbenzene oil has a viscosity in the range of ² to 15 mm ² /s, preferably 3 to 7 mm ² /s.

According to the present invention, those skilled in the art can select any alkyl benzene oil meeting the above requirements to obtain the base oil of the present invention. In a preferred embodiment of the present invention, the alkylbenzene oil usable in the above base oil includes, but is not limited to, an alkylbenzene oil having an alkyl group having 8 to 18 carbon atoms, and preferably, the above The alkyl benzene oil is a single chain alkyl benzene oil including, but not limited to, mercaptobenzene, undecylbenzene, dodecylbenzene, tridecylbenzene, pentadecylbenzene, hexadecylbenzene One or two or a mixture of two or more. For example, including but not limited to, commercially available from Pt. Unggul Indah Cahaya Tbk. (Indonesian company), commercially available from Tianjin Haote Chemical Co., Ltd. or commercially available from South Korea, its dominant company, alkyl benzene oil.

Although the base oil satisfying the above conditions can attain the object of the present invention, the inventors of the present invention have found that when another hydrocarbon oil different from alkylbenzene oil is further added to the above base oil, further The viscosity of the base oil is lowered, and the compatibility with the hydrocarbon refrigerant is better, which is favorable for promoting the obtained refrigerator oil to have better low-temperature fluidity and lubricity and a lower friction coefficient, thereby being better. The realization of energy saving and emission reduction and environmental protection.

According to the present invention, there is no particular requirement for another hydrocarbon oil other than alkyl benzene oil to be added to the base oil and the amount thereof, as long as the addition of the other hydrocarbon oil different from the alkyl benzene oil , can still meet the ratio of the base oil 120 ° C kinematic viscosity and 40 ° C kinematic viscosity in the range of 0.23-0.30. Preferably, the other hydrocarbon oil different from the alkyl benzene oil has a 40 ° C kinematic viscosity of 4 mm ² /s or less, a pour point of less than -30 ° C, and a boiling point of less than 280 ° C. By adjusting the above properties of the hydrocarbon oil, it is advantageous to better adjust the base oil prepared, as well as the final properties of the refrigerating machine oil composition. In turn, it is conducive to better achieving energy conservation and emission reduction, thereby protecting the environment.

More preferably, the content of another hydrocarbon oil different from the alkylbenzene oil is from 0.1 to 20% by weight based on the total amount of the above base oil. Preferably, the content of the alkylbenzene oil is 40-74.9 wt.%, the content of the ester oil is 25-60 wt.%, and the other is different from the alkylbenzene oil based on the total amount of the above base oil. The hydrocarbon oil is present in an amount of from 0.1 to 20% by weight. More preferably, the content of another hydrocarbon oil different from the alkylbenzene oil is from 5 to 10% by weight based on the total amount of the above base oil.

In accordance with the present invention, one skilled in the art can select any other hydrocarbon oil other than the alkyl benzene oil that meets the above requirements to obtain the base oil of the present invention. In a preferred embodiment of the present invention, another hydrocarbon oil different from alkyl benzene oil which may be used in the above base oil includes, but is not limited to, Fischer-Tropsch synthesized isoparaffins, hydroisomerized alkanes, One or more of hydrocracking isoparaffins, polyalphaolefins, olefin stacking oils, polyalkylcyclopentanes, polyalkylcyclohexanes.

These optional hydrocarbon oils may be any commercially available products or synthetic or by-products of any petrochemical, coal chemical and other chemical processes, as long as they are tested or treated to meet a 40 ° C kinematic viscosity of 4 mm ² /s. Hereinafter, the pour point is less than -30 ° C, and the boiling point is less than 280 ° C, which can be used as an active ingredient of the base oil for the refrigerating machine oil composition of the present invention.

The present invention also provides a refrigerating machine oil composition comprising a base oil and an additive, wherein the base oil is a base oil for the above refrigerating machine oil composition. According to the refrigerating machine oil composition provided by the present invention, in the refrigerating machine oil composition, by adding an additive to the base oil, the ratio of the 120 ° C kinematic viscosity of the base oil to the 40 ° C kinematic viscosity is slightly changed, in the present invention. Preferably, the ratio of the 120 ° C kinematic viscosity of the refrigerator oil composition to the 40 ° C kinematic viscosity is from 0.23 to 0.30, more preferably from 0.24 to 0.29. The ratio of the 120 ° C kinematic viscosity of the refrigerating machine oil composition to the 40 ° C kinematic viscosity is controlled within this range, which is advantageous in improving the viscosity-temperature characteristics of the oil by lowering the low-temperature viscosity of the oil (low viscosity tendency). Increase the thickness of the oil film at high temperature, improve the boundary lubrication and sealing, and thus improve the COP value of the refrigeration efficiency of the compressor, and finally achieve the purpose of energy saving and environmental protection.

According to the refrigerator oil composition provided by the present invention, in a preferred case, the oil composition has a kinematic viscosity at 40 ° C of 2 to 15 mm ² /s, preferably 3 to 7 mm ² /s, a flash point of more than 140 ° C, and a flash point of more than 150. °C, the pour point is less than -50 ° C; in another preferred case, the above-mentioned refrigerator oil composition is based on the total amount of the composition, the base oil content is 94-98 wt.%, and the content of the additive is 2-6wt.%.

The preparation of the refrigerating machine oil composition of the present invention is not particularly required, and if the refrigerating machine oil composition of the present invention is mixed with a base oil and an additive, the base oil for the refrigerating machine oil composition may be obtained first, and then mixed with the additive, or directly The components constituting the refrigerator oil composition with the base oil are directly mixed with the additive to obtain a refrigerating machine oil composition, which is not particularly required in the present invention.

Preferably, the above additive is selected from one or more of a lubricant, an antifriction agent, an antioxidant, an anticorrosive agent, and an antifoaming agent.

According to the refrigerating machine oil composition provided by the present invention, the above additives and their contents may be various conventional additives for refrigerating machine oil compositions and their conventional contents. For example, the above additives may be a lubricant for improving the lubricating properties of the refrigerating machine oil, an antifriction agent for improving the antifriction property, and an antioxidant, an anticorrosive agent, an antifoaming agent and the like for improving the thermal oxidation stability.

The above lubricant may be a phosphate ester lubricant commonly used in the art, such as tricresyl phosphate, triphenyl phosphate, octyl diphenyl phosphate, benzyl diphenyl phosphate, phenyl phosphorothioate. One or more of them. The lubricant may be included in an amount of from 0 to 6.0% by weight, based on the total amount of the composition, preferably from 1.0 to 3.5% by weight.

The antifriction agent may be one or more of long-chain fatty acids, long-chain fatty alcohols, long-chain fatty esters, amides, phosphonates and commercially available energy-saving antifriction agents which are generally used in the art, and may specifically be oils. Acid, dimerized linoleic acid, dodecyl alcohol, butyl stearate, ethylene glycol oleate, oleic acid amide, benzotriazole dodecylamine, etc., diisooctylphosphonate and eutectic ball One or more of them. The antifriction agent may be included in an amount of from 0 to 0.8% by weight, preferably from 0.02 to 0.6% by weight, based on the total amount of the composition.

The above antioxidants may be various phenolic antioxidants commonly used in the art, such as 2,6-di-tert-butyl-p-cresol, 2,3-di-tert-butyl-4-cresol, 2,6-di One or more of tert-butylphenol, 4,4'-tetramethylbis(2,6-di-tert-butylphenol), hydroquinone, and β-naphthol. The antioxidant may be included in an amount of from 0 to 3% by weight, preferably from 0.2 to 0.8% by weight, based on the total amount of the composition.

The above anticorrosive agent may be a benzotriazole derivative and a thiadiazole derivative anticorrosive agent commonly used in the art, such as N,N-dialkylaminomethylene benzotriazole, 2,5-dimercapto-1,3 One or more of a 4-thiadiazole derivative, a dimercapto-benzothiadiazole, and a sodium dimercaptothiadiazole. The anticorrosive agent may be included in an amount of from 0 to 0.1% by weight, preferably from 0.02 to 0.05% by weight, based on the total amount of the composition.

The antifoaming agent may be an antifoaming agent generally used in the art, such as one or more of a dimethicone, a homopolymer or a copolymer of an acrylate. The antifoaming agent may be included in an amount of from 0 to 0.01% by weight, preferably from 0.001 to 0.005% by weight, based on the total amount of the composition.

The present invention also provides a composition for refrigeration, the composition comprising a refrigerating machine oil composition and a refrigerant, wherein the refrigerating machine oil composition is the above refrigerating machine oil composition.

According to the invention, the refrigerant may be any refrigerant known to those skilled in the art. Preferably, the refrigerant is a hydrocarbon refrigerant such as R600A or R290 or R134A.

According to the present invention, preferably, the composition of the refrigerator oil composition is 70-90 wt.%, more preferably 75-90 wt.%, and the content of the refrigerant is 10-30 wt.%, more preferably in the composition. It is 10-25wt.%.

The present invention also provides a method of refrigeration, comprising: mixing or recombining a refrigerating machine oil composition and a refrigerant into a compressor of a refrigerating device for compression, wherein the refrigerating machine The oil composition is the above-described refrigerating machine oil composition; the refrigerating machine oil composition is added in an amount of 70-90 wt.%, more preferably 75-90 wt.%, based on the total amount of the refrigerating machine oil composition and the refrigerant. The amount of the refrigerant to be added is 10 to 30 wt.%, more preferably 10 to 25 wt.%.

In the refrigerating method of the present invention, the refrigerating machine oil composition may be added after being mixed, and the components constituting the refrigerating machine oil composition may be directly added, which is not particularly required in the present invention.

According to the present invention, it is preferred that the refrigerator oil composition is used in an amount of 0.2 to 0.5 kg with respect to a cooling capacity of 3.5 kW.

Unless otherwise stated, the starting materials and reagents of the present invention are all commercially available.

The invention is further illustrated by the following examples. The following Examples 1-10 are used to illustrate the base oil, the refrigerator oil composition for a refrigerating machine oil composition provided by the present invention, and a preparation method thereof.

Example 1

(1) Raw materials and dosage of base oil for refrigerating machine oil composition:

Alkyl benzene oil: commercially available from Pt. Unggul Indah Cahaya Tbk. (Indonesian company) alkyl benzene oil (which includes 10% by weight of decyl benzene, 25% by weight of undecyl benzene, and 35% by weight of twelve An alkylbenzene and 30% tridecylbenzene having a kinematic viscosity at 40 ° C of 4.2 mm ² /s) in an amount of 35 parts by weight;

Ester oil: di-n-octyl 3-methyladipate (kinematic viscosity at 40 ° C is 8.38 mm ² / s, viscosity index is 170), the amount is 45 parts by weight;

Another hydrocarbon oil different from alkyl benzene oil: Fischer-Tropsch synthesized isoparaffin produced by the SHELL company (indirect coal liquefaction) in the Netherlands (the main component of which is isoparaffin, 40 ° C kinematic viscosity is 2.8 mm ² / s, pour point is -32 ° C, boiling point is 270 ~ 280 ° C), and the amount is 5 parts by weight.

(2) Mixing method of base oil for refrigerating machine oil composition: The above raw materials are mixed in proportion and formulated into a base oil for a refrigerating machine oil composition.

(3) Refrigerator oil composition and preparation method thereof:

The above-mentioned refrigerator oil composition is used with a base oil and 0.1 part by weight of 2,6-di-tert-butyl-p-cresol, 3 Parts by weight of tricresyl phosphate, 0.2 parts by weight of ethylene oleate and 0.03 parts by weight of N,N-dialkylaminomethylene benzenetriazole were uniformly mixed and formulated into a refrigerating machine oil composition, which was designated as S1.

Example 2

(1) Raw materials and dosage of base oil for refrigerating machine oil composition:

Alkyl benzene oil: commercially available from Tianjin Haote Chemical Co., Ltd., the main raw material is alkyl benzene oil of dodecyl benzene (the kinematic viscosity at 40 ° C is 4.2 mm ² / s), the amount is 60 parts by weight;

Ester oil: 1,10-nonanediol di(2-ethylhexyl) ester (kinetic viscosity at 40 ° C of 12.1 mm ² / s, viscosity index of 133), the amount is 30 parts by weight;

Another hydrocarbon oil different from alkyl benzene oil: Hydroisomerized alkane produced by the hydroisomerization process of YOUGONG (Korea) Co., Ltd. (the main component of which is isoparaffin, 40 ° C kinematic viscosity is 3.2 mm ² /s The pour point is -38 ° C, the boiling point is 270 to 280 ° C), and the amount is 10 parts by weight.

(2) Mixing method of base oil for refrigerating machine oil composition: The above raw materials are mixed and formulated into a base oil for a refrigerating machine oil composition.

(3) Refrigerator oil composition and preparation method thereof:

The foregoing refrigerator oil composition is used with a base oil and 0.2 parts by weight of 2,6-di-tert-butyl-p-cresol, 3.5 parts by weight of tricresyl phosphate, 0.18 parts by weight of ethylene oleate, and 0.04 parts by weight of N,N. - Dialkylaminomethylene benzotriazole was uniformly mixed and formulated into a refrigerating machine oil composition, which was designated as S2.

Example 3

(1) Raw materials and dosage of base oil for refrigerating machine oil composition:

Alkyl benzene oil: commercially available from Korea's dominant company, the main raw material is dodecylbenzene alkyl benzene oil (40 ° C kinematic viscosity of 3.8 mm ² / s), the amount of 50 parts by weight;

Ester oil: glycerol trihexanoate (kinematic viscosity at 40 ° C is 8.93 mm ² / s, viscosity index is 170), the amount is 40 parts by weight;

Another hydrocarbon oil different from alkyl benzene oil: polyalphaolefin produced by Mobil (USA) (the main component of which is isoparaffin, having a kinematic viscosity at 40 ° C of 3.2 mm ² /s and a pour point of -60 ° C, The boiling point is 270 to 280 ° C), and the amount is 10 parts by weight.

(2) Mixing method of base oil for refrigerating machine oil composition: The above raw materials are mixed and formulated into a base oil for a refrigerating machine oil composition.

(3) Refrigerator oil composition and preparation method thereof:

The foregoing refrigerator oil composition is used with a base oil and 0.5 parts by weight of 2,6-di-tert-butyl-p-cresol, 5 parts by weight of tricresyl phosphate, 0.2 parts by weight of ethylene oleate, and 0.05 parts by weight of N,N. - Dialkylaminomethylene benzotriazole was uniformly mixed and formulated into a refrigerating machine oil composition, designated as S3.

Example 4

(1) Raw materials and dosage of base oil for refrigerating machine oil composition:

Alkyl benzene oil: same as in Example 1, the amount is 60 parts by weight;

Ester oil: same as in Example 1, the amount is 40 parts by weight;

(2) Mixing method of base oil for refrigerating machine oil composition: The above raw materials are mixed in proportion and formulated into a base oil for a refrigerating machine oil composition.

(3) Refrigerator oil composition and preparation method thereof:

Referring to Example 1, the refrigerating machine oil composition prepared in the step (2) of the embodiment 6 was replaced with a base oil in the base oil of the refrigerating machine oil composition prepared in the step (2) of the first embodiment, and was formulated into a refrigerating machine oil composition. For S4.

Example 5-10

(1) Raw materials and dosage of base oil for refrigerating machine oil composition:

See Table 1 below, in which the selected alkylbenzenes are all alkylbenzene oils commercially available from Pt. Unggul Indah Cahaya Tbk. (Indonesia).

Table 1.

(2) Mixing method of base oil for refrigerating machine oil composition: Refer to Example 1.

(3) Refrigerator oil composition and preparation method thereof:

Referring to Example 1, the refrigerating machine oil composition prepared in the step (2) of the embodiment 5-10 was replaced with a base oil to replace the refrigerating machine oil composition prepared in the step (2) of the first embodiment with a base oil, and was formulated into a refrigerating machine oil combination. The record is S5-S10.

Comparative example 1

(1) Raw materials and dosage of base oil for refrigerating machine oil composition:

Alkyl benzene oil: same as in Example 1, the amount is 100 parts by weight;

(2) Refrigerator oil composition and preparation method thereof: Referring to Example 1, the refrigerator oil composition prepared in the step (1) of Comparative Example 1 was replaced with the base oil to replace the refrigerator oil composition prepared in the step (1) of Example 1. The base oil was used to prepare a refrigerating machine oil composition as D1.

Comparative example 2

(1) Raw materials and dosage of base oil for refrigerating machine oil composition:

Alkyl benzene oil: commercially available from Pt. Unggul Indah Cahaya Tbk. (Indonesian company) alkyl benzene oil (ingredients including 55 wt% of tridecyl benzene, 25 wt% of tetradecyl benzene and 20 wt% of ten Pentaalkylbenzene has a kinematic viscosity at 40 ° C of 5.21 mm ² /s) in an amount of 100 parts by weight.

(2) Refrigerating machine oil composition and preparation method thereof: Referring to Example 1, the refrigerating machine oil composition prepared in the step (1) of Comparative Example 2 was replaced with the base oil to replace the refrigerating machine oil composition prepared in the step (1) of Example 1. The base oil was used to prepare a refrigerating machine oil composition as D2.

Comparative example 3

(1) Raw material and amount of base oil for refrigerating machine oil composition: Refer to Comparative Example 1, except that it does not contain alkyl benzene oil, and the amount of the ester oil is 50 parts by weight, which is different from the alkyl benzene oil. A hydrocarbon oil is used in an amount of 50 parts by weight.

(2) Mixing method of base oil for refrigerating machine oil composition: The above raw materials are mixed and formulated into a base oil for a refrigerating machine oil composition.

(3) Refrigerator oil composition and preparation method thereof: Referring to Example 1, the composition of the refrigerator oil was designated as D3.

Comparative example 4

Currently, the most widely used hydrocarbon-based refrigerating machine oil CS1 (trade name: suniso1GS Aj sun oil Co.) using R600A as a refrigerant is referred to as D4.

Comparative example 5

The hydrocarbon refrigeration oil K7P, which has been promoted on the market with R600A as refrigerant, is recorded as D5.

Test Example 1:

The physicochemical properties of the base oils formulated for the refrigerator oil compositions of Examples 1 to 10 and Comparative Examples 1 to 5 are shown in Table 2.

Table 2.

*R1: ratio of kinematic viscosity at 120 °C of base oil to kinematic viscosity at 40 °C

As can be seen from the data in Table 2, the kinematic viscosity of "Example 1" was lower than that of "Comparative Example 2" at 40 ° C, and the kinematic viscosity of "Example 7" was lower than that of "Comparative Example 1". However, at 120 ° C, the 120 ° C kinematic viscosity of "Example 1" is equal to "120 ° C kinematic viscosity of Comparative Example 2; the 120 ° C kinematic viscosity of "Example 7" is higher than the "Comparative Example 1" of 120 ° C Kinematic viscosity; it can be seen that by selecting an appropriate alkyl benzene oil and an ester oil, and reasonably adjusting the ratio of the two, the ratio of the viscosity of the base oil at 120 ° C to the viscosity at 40 ° C meets the requirements of the present invention, and the present invention can be improved. Claim The viscosity-temperature characteristics of the protected base oil.

Test Example 2:

The physicochemical properties of the refrigerator oil compositions formulated in Examples 1 to 10 and Comparative Examples 1 to 5 are shown in Table 3:

table 3.

*R2: ratio of 120 ° C kinematic viscosity to 40 ° C kinematic viscosity of the refrigerating machine oil composition

Example 11-20

Examples 11-20 are used to illustrate the compositions for refrigeration provided by the present invention.

The refrigerating machine oil composition samples S1-S10 prepared in Examples 1-10 were separately mixed with the refrigerant R600A, and the compositions T1-T10 for refrigeration were sequentially obtained. The composition of the compositions T1-T10 for refrigeration is shown in Table 4.

Comparative example 6-10

The refrigerating machine oil composition samples D1-D5 prepared in Comparative Examples 1-5 were mixed with a refrigerant R600A to obtain compositions E1-E5 for refrigeration. The composition of the compositions E1-E5 used for refrigeration is shown in Table 4.

Table 4

Sample serial number	T1	T2	T3	T4	T5	T6	T7	T8
Refrigerator oil composition / weight%	90	90	90	90	90	90	90	90
R600A/% by weight	10	10	10	10	10	10	10	10
Sample serial number	T9	T10	E1	E2	E3	E4	E5
Refrigerator oil composition / weight%	90	90	90	90	90	90	90
R600A/% by weight	10	10	10	10	10	10	10

Test Example 3: (compressor performance test)

Test method: 27 g (about 300 mL) of each sample of the refrigerating machine oil composition prepared in Examples 1-10 and Comparative Examples 1-5 was injected into a refrigerator compressor (PZ89DIY-4DV), and 30 g of R600A was used as a refrigerant. Performance tests were performed on the compressor performance test bench.

Test items and basis:

Wear spot diameter: according to GB/T3142 (30kg, 30min, 1200 rpm, room temperature);

Maximum oil film strength (PB value): according to GB/T3142 (1200 rpm, room temperature);

Falex extreme pressure load (lbs): according to ASTM D323

COP value (refrigeration efficiency): The ratio of the amount of cooling (heat) to the input power that can be achieved by the heat pump system; and the energy saving effect (energy saving rate) is derived from the COP value.

Test results: See Table 5.

table 5.

Sample serial number	S1	S2	S3	S4	S5	S6	S7	S8
Wear spot diameter (mm)	0.39	0.38	0.37	0.37	0.37	0.38	0.40	0.37
PB (KG)	46	50	52	52	53	52	45	53
Falex extreme pressure load (lbs)	1050	1100	1100	1150	1150	1100	1000	1100
COP value	1.92	1.88	1.88	1.91	1.86	1.90	1.89	1.90

Energy saving rate (%)	12.3	9.9	9.9	11.7	8.8	11.1	10.5	11.1
Sample serial number	S9	S10	D1	D2	D3	D4	D5
Wear spot diameter (mm)	0.37	0.38	0.52	0.50	0.44	0.46	0.50
PB (KG)	52	52	38	38	45	40	38
Falex extreme pressure load (lbs)	1100	1150	800	900	900	600	550
COP value	1.88	1.88	1.87	1.87	1.84	1.71	1.78
Energy saving rate (%)	9.9	9.9	9.4	9.4	7.6	0	4.1

Note: The energy saving rate is the percentage increase of COP based on the value of solar oil SUNISO 1GSAJ.

It can be seen from the results of the above Table 2 to Table 5 that the refrigerator oil composition provided by the present invention has excellent compatibility with the R600A refrigerant and thermochemical stability, and has excellent viscosity temperature characteristics, a high flash point, Excellent low temperature fluidity, good lubricity and low coefficient of friction show significant energy savings.

Moreover, the base oil for the above-mentioned refrigerator oil composition of the present invention is advantageous in obtaining a base oil having a lower viscosity by using an alkylbenzene oil, and at the same time, by using an alkylbenzene oil in combination with a low viscosity, high viscosity index ester oil, By adjusting the ratio of the viscosity of the base oil at 120 ° C to the viscosity at 40 ° C, it is advantageous to form a base oil whose viscosity does not excessively decrease as the temperature increases. By increasing its viscosity-temperature characteristics, it increases the thickness of the oil film at high temperatures, improves the boundary lubricity and sealing performance, and further improves the refrigeration efficiency of the compressor, ultimately achieving the goal of further energy saving and environmental protection.

The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solutions of the present invention within the scope of the technical idea of the present invention. These simple variants All fall within the scope of protection of the present invention.

It should be further noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not be further described in various possible combinations.

In addition, any combination of various embodiments of the invention may be made as long as it does not deviate from the idea of the invention, and it should be regarded as the disclosure of the invention.

Claims (16)

1. A base oil for a refrigerating machine oil composition, characterized in that the base oil contains an alkylbenzene oil and an ester oil, and the ratio of the kinematic viscosity at 120 ° C of the base oil to the kinematic viscosity at 40 ° C is 0.23 - 0.30.
2. The base oil according to claim 1, wherein the base oil has a kinematic viscosity at 40 ° C of ² to 15 mm ² /s, and a ratio of a kinematic viscosity at 120 ° C of the base oil to a kinematic viscosity at 40 ° C is 0.24 to 0.29.
3. The base oil according to claim 2, wherein the base oil has a kinematic viscosity at 40 ° C of 3 to 7 mm ² /s, and when the base oil has a kinematic viscosity at 40 ° C of 3 to 5 mm ² /s, The ratio of °C kinematic viscosity to 40°C kinematic viscosity is 0.24～0.29; when the base oil 40°C kinematic viscosity is more than 5mm ² /s to less than or equal to 7mm ² /s, its 120°C kinematic viscosity and 40°C kinematic viscosity The ratio is 0.23 to 0.28.
4. The base oil according to claim 1, wherein the alkylbenzene oil is contained in an amount of 40 to 80% by weight based on the total amount of the base oil, and the ester oil is contained in an amount of 20 to 60% by weight. %.
5. The base oil according to any one of claims 1 to 4, wherein the ester oil has a kinematic viscosity at 40 ° C of ² to 15 mm ² /s, preferably 8 to ¹⁵ mm ² /s, and the esters The viscosity index of the oil is greater than 90, preferably greater than 120.
6. The base oil according to claim 5, wherein the ester oil is selected from one or more of the following ester oils:

   a C ₆ -C ₁₄ monohydric alcohol ester, preferably a monohydric alcohol selected from the group consisting of C ₁₃ -C ₆ esters of isotridecyl alcohol, isodecyl alcohol or isodecyl alcohol;

   a C ₈ -C ₁₈ monobasic acid ester, preferably a C ₁ -C ₈ normal or isomeric alcohol ester of a monobasic acid selected from the group consisting of citric acid, dodecanoic acid, tetradecanoic acid, palmitic acid or octadecanoic acid;

   a C ₄ -C ₁₂ glycol ester, preferably a C ₅ -C ₁₀ normal or different diol selected from its own diol, methyl hexane diol, neopentyl glycol or 1,10- decanediol Acid ester

   a C ₄ -C ₁₂ dibasic acid ester, preferably a dibasic acid selected from the group consisting of C ₄ -C ₁₀ normal structures of succinic acid, adipic acid, pimelic acid, sebacic acid, sebacic acid or phthalic acid Isomerized alcohol ester;

   a C ₃ -C ₆ polyol ester, preferably a C ₄ -C ₁₀ normal or isomeric acid ester of a polyol selected from the group consisting of glycerol, trimethylolpropane or pentaerythritol;

   a C ₃ -C ₂₀ polybasic acid ester, preferably a C ₄ -C ₁₀ normal or isomeric alcohol ester of a polybasic acid selected from the group consisting of trimellitic acid or pyromellitic acid;

   Polyalkoxy ether monoester having the following structural formula:

   

   Wherein n ₁ is an integer of 0 or 1-3, n ₂ is an integer of 1-3, and R ₁ is C ₄ H ₉ -, C ₅ H ₁₁ -, C ₆ H ₁₃ - or C ₇ H ₁₅ - And R ₂ is one of C ₁₁ H ₂₃ -, C ₆ H ₁₃ -, C ₈ H ₁₇ -, C ₁₀ H ₂₁ - or C ₁₂ H ₂₅ -;

   Polyalkyleneoxyether diester having the following structural formula:

   

   Wherein m is an integer in 1-3, and R ₃ and R ₄ are each independently selected from C ₆ H ₁₃ -, C ₇ H ₁₅ -, C ₈ H ₁₇ -, C ₉ H ₁₉ - or C ₁₀ H ₂₁ - One kind.
7. The base oil according to claim 6, wherein the ester oil is selected from the group consisting of di(2-ethylhexyl) dodecanoate, di(2-ethylhexyl) phthalate, and methyl stearate. , isobutyl laurate, isoamyl laurate, 3-methyl-1,6-ethylene glycol di-n-octanoate, 1,10-decanediol di(2-ethylhexyl) ester, hexane Alcohol diisooctanoate, di-n-octyl adipate, di-n-octyl 3-methyladipate, di(2-ethylhexyl) adipate, m-cyclohexyl di adipate 2-ethylhexyl) ester, p-methylcyclohexyl bis(2-ethylhexyl) adipate, di(2-ethylhexyl) sebacate, di-n-butyl sebacate, glycerol Trihexanoate, pentaerythritol tetrahexanoate, trimethylolpropane trihexanoate and trimethylolpropane trivalerate, the chemical formula is

   

   a polyalkyleneoxydiether diester, and a group of polyalkoxy ether monoesters having the following chemical formula,

   
8. The base oil according to claim 1, wherein the alkylbenzene oil has a kinematic viscosity at 40 ° C of ² to 15 mm ² /s, preferably 3 to 7 mm ² /s,

   Preferably, the alkyl benzene oil is one or two of mercaptobenzene, undecylbenzene, dodecylbenzene, tridecylbenzene, pentadecylbenzene, and hexadecylbenzene. And a mixture of two or more kinds.
9. The base oil according to claim 1, wherein said base oil further contains another hydrocarbon oil different from alkyl benzene oil,

   Preferably, the other hydrocarbon oil different from the alkyl benzene oil has a 40 ° C kinematic viscosity of 4 mm ² /s or less, a pour point of less than -30 ° C, and a boiling point of less than 280 ° C;

   More preferably, the content of the other hydrocarbon oil different from the alkylbenzene oil is from 0.1 wt.% to 20 wt.%, based on the total amount of the base oil.
10. The base oil according to claim 9, wherein the other hydrocarbon oil different from the alkylbenzene oil is selected from the group consisting of Fischer-Tropsch synthesis isoparaffins, hydroisomerized alkanes, hydrocracking isoparaffins, poly alpha One or more of an olefin, an olefinic superposed oil, a polyalkylcyclopentane, and a polyalkylcyclohexane.
11. A refrigerating machine oil composition, the composition comprising a base oil and an additive, wherein the base oil is the base oil for a refrigerating machine oil composition according to any one of claims 1 to 10.
12. The composition according to claim 11, wherein the ratio of the 120 ° C kinematic viscosity to the 40 ° C kinematic viscosity of the composition is from 0.23 to 0.30, preferably from 0.24 to 0.29.
13. The composition according to claim 12, wherein said composition has a kinematic viscosity at 40 ° C of 2 to 15 mm ² /s, preferably 3 to 7 mm ² /s, a flash point of more than 140 ° C, a flash point of more than 150 ° C, and a pour point. Less than -50 ° C.
14. The composition according to any one of claims 11 to 13, wherein the base oil is contained in an amount of from 94 to 98% by weight based on the total amount of the composition, and the additive is contained in an amount of from 2 to 6 % by weight. %,

    Preferably, the additive is selected from one or more of a lubricant, an antifriction agent, an antioxidant, an anticorrosive agent, and an antifoaming agent.
15. A composition for refrigeration, the composition comprising a refrigerating machine oil composition and a refrigerant, wherein the refrigerating machine oil composition is the refrigerating machine oil composition according to any one of claims 11 to 14.
16. The composition according to claim 15, wherein the refrigerating machine oil composition is 70-90 wt.%, and the refrigerant content is 10-30 wt.%, based on the total amount of the composition.

    Preferably, the refrigerant is any one of R600A, R290 or R134A.