A high efficiency refrigerant oil composition and a method for producing the same

Abstract

The application discloses a kind of high-efficiency refrigerator oil compositions and preparation method thereof, by the synergy of multivariate base oil composite system and multifunctional additive package, ensure excellent low-temperature fluidity and good compatibility of refrigerant under the premise, significantly enhance the high-temperature oxidation stability of system, effectively inhibit the generation of oil sludge and carbon deposition, thereby greatly prolong the working life of lubricating system, create a balanced, strong adaptability, comprehensive reliable high-performance refrigerator oil solution, can fully meet the high standard, multidimensional requirements of new generation of environmental protection refrigerant system to lubricating oil. It fundamentally solves the performance short board and application limitation of traditional mineral oil, POE and PAG synthetic oil when adapting R290 etc. Natural refrigerant, realizes the significant leap of refrigerator oil comprehensive performance and the improvement of full working condition adaptability.

Description

Technical Field

[0001] This invention relates to the field of lubricating oil technology, and in particular to a high-efficiency refrigeration oil composition and its preparation method. Background Technology

[0002] With increasingly stringent global environmental regulations, the Montreal Protocol's complete phase-out of ozone-depleting substances (ODS) such as CFCs and HCFCs, the EU's F-gas regulations imposing quota reductions and equipment bans on high-GWP hydrofluorocarbons (HFCs), and China's Kigali Amendment's implementation plan explicitly freezing and gradually reducing HFCs, are driving the transformation of refrigerants towards low-carbon, zero-ozone-depletion refrigerants. Against this backdrop, natural refrigerants (such as R290) with zero ozone depletion potential (ODP) and extremely low global warming potential (GWP) have become an ideal alternative to traditional Freon refrigerants. R290, as a natural refrigerant, not only boasts excellent environmental performance but also possesses superior thermodynamic properties and high refrigeration efficiency, demonstrating broad application prospects in small and medium-sized refrigeration equipment. However, its inherent characteristics impose multiple stringent requirements on the performance of its matching refrigeration oil and impose clear limitations on the amount of R290 added to the system. Thermal oxidation stability is a core requirement, and various performance characteristics must work in synergy to adapt to the application conditions of R290: Firstly, thermal oxidation stability requires excellent resistance to oxidation and degradation under high-temperature conditions (compressor discharge temperature above 100℃) to reduce sludge and carbon deposit formation, preventing system heat exchange and lubrication from being affected by oil deterioration; secondly, low-temperature fluidity requires good fluidity under low-temperature conditions (below -30℃), with a pour point meeting the system's low-temperature operating requirements to avoid pipe blockage; thirdly, lubrication durability requires R290… The dilution effect of the oil reduces its viscosity, and the oil must maintain sufficient oil film strength and anti-wear performance to reduce wear on the moving parts of the compressor. Fourth, compatibility requirements: the current mainstream refrigeration equipment system adopts a design system in which oil and refrigerant are miscible. The refrigeration oil and R290 form a stable and homogeneous miscible system, so there is no need to design additional oil separators or other supporting structures for the separation of refrigeration oil and refrigerant, which can reduce the manufacturing design requirements and production costs of the compressor. If the refrigeration oil and refrigerant are immiscible, stratification is likely to occur, which will directly lead to oil shortage and lubrication failure in the refrigeration system. Fifth, corrosion prevention and foam control requirements: it is necessary to provide effective protection for metal parts such as copper, iron, and aluminum in the refrigeration system, and at the same time have excellent defoaming performance to avoid problems such as poor lubrication and cavitation caused by foam generation. Sixth, electrical insulation requirements: it is compatible with some compressor systems with high electrical performance requirements to ensure the safe electrical operation of the system.

[0003] Existing refrigeration oils all have certain performance shortcomings when adapted to R290, making it difficult to meet its comprehensive application requirements. While traditional mineral oils have good miscibility with R290 and a significant cost advantage, they fall short in meeting the requirements of R290 systems in terms of low-temperature fluidity, thermal oxidation stability, lubrication and anti-wear properties, metal corrosion prevention, and foam control. Under high-temperature and high-pressure conditions, they are prone to oil deterioration and the formation of acidic substances, leading to component wear and system corrosion with long-term use, severely impacting the reliability and service life of the refrigeration system. Polyester synthetic oils (POE), developed to adapt to new environmentally friendly refrigerants, possess excellent thermal oxidation stability and miscibility with R290 between mineral oils and PAGs. However, they are hygroscopic and prone to hydrolysis, imposing stringent requirements on the dryness of the system and the operating conditions. Furthermore, the acidic substances produced by hydrolysis exacerbate corrosion of system metal components. Additionally, POE... The high cost of raw materials limits its large-scale application. Although polyalkylene glycol (PAG) has excellent lubrication and anti-wear properties and is immiscible with R290, it can improve the heat exchange efficiency of refrigerant in the system and reduce the amount of R290 required, making it a potential direction for the application of R290 refrigerant. However, the current mainstream design of refrigeration equipment is based on the miscibility of oil and refrigerant. Using the immiscible PAG solution requires redesigning the equipment structure and adding additional components such as oil separators, which significantly increases the R&D and manufacturing costs of compressors. At the same time, the defects of PAG itself, such as strong water absorption and poor electrical insulation properties, also limit its application in refrigeration systems with high electrical performance requirements.

[0004] Furthermore, existing refrigeration oils are mostly formulated using a single base oil (such as pure naphthenic or pure paraffinic base oil), making it difficult to balance high and low temperature performance. They tend to have high pour points at low temperatures and are prone to oxidation and degradation at high temperatures. Moreover, the additive combinations lack specificity, resulting in poor synergistic effects in anti-oxidation, anti-wear, anti-sludge, anti-corrosion, and defoaming properties. Even with component blending, some refrigeration oils still easily develop sludge buildup or lubrication issues under prolonged high temperatures, leading to shortened compressor lifespan. Therefore, developing a high-efficiency refrigeration oil composition that is compatible with natural refrigerants such as R290, meets multiple core performance requirements including thermal oxidation stability, and aligns with current mainstream equipment system designs has significant industrial application value and market prospects. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a high-efficiency refrigeration oil composition and its preparation method, so as to solve one or more problems existing in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a high-efficiency refrigeration oil composition, comprising base oil and additives, wherein the base oil accounts for 93%-99% of the total mass of the composition, and the additives account for 1%-7% of the total mass of the composition; the base oil comprises the following components by mass fraction: paraffinic base oil component A with a mass fraction of 8%-35%, intermediate base oil component B with a mass fraction of 8%-35%, naphthenic base oil component C with a mass fraction of 20%-48%, aromatic base oil component D with a mass fraction of 3%-18%, aromatic ester lubricating oil component E with a mass fraction of 2%-12%, diester lubricating oil component F with a mass fraction of 0.5%-7%, and polyols. The mass fraction of ester lubricating oil component G is 0.5%-7%; the additives include the following components by mass fraction: 0.2%-1.0% of shielding phenolic antioxidant H, 0.2%-1.0% of phenolic ester antioxidant I, 0.2%-1.0% of aromatic amine antioxidant J, 0.2%-1.0% of phosphite antioxidant K, 0.05%-0.5% of benzotriazole derivative metal deactivator L, 0.05%-0.15% of benzotriazole fatty amine oiliness agent M, 0.05%-0.6% of benzotriazole, 0.7%-2.0% of phosphate ester extreme pressure agent N, and 0.002%-0.015% of antifoaming agent O.

[0007] In one embodiment of the present invention, the shielding phenolic antioxidant H includes one or more of 2,6-di-tert-butyl-p-cresol, 2,3-di-tert-butyl-4-cresol, 2,6-di-tert-butylphenol, 4,4'-tetramethylbis(2,6-di-tert-butylphenol), hydroquinone, or β-naphthol.

[0008] In one embodiment of the present invention, the phenolic ester type antioxidant I includes isooctyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], methyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, butyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 2,2'- One or more of the following: methylene bis(4-methyl-6-tert-butylphenol) propionate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione, stearate β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, pentaerythritol tetra(3,5-di-tert-butyl-4-hydroxybenzoate) or β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate isodecanol ester.

[0009] In one embodiment of the present invention, the aromatic amine antioxidant J includes one or more of octyl / butyl diphenylamine, nonyl diphenylamine, dioctyl diphenylamine, dinonyl diphenylamine, diisooctyl diphenylamine, butyloctyl diphenylamine, N-phenyl-1-naphthylamine, N-phenyl-2-naphthylamine, octylphenyl-α-naphthylamine, or 4,4'-bis(phenylisopropyl)diphenylamine.

[0010] In one embodiment of the present invention, the phosphite antioxidant K comprises one or more of the following polymers: tris(2,4-di-tert-butylphenyl) phosphite, bis(2,4-di-tert-butylphenyl)phenyl phosphite, pentaerythritol diphosphite, diphenyl isooctyl phosphite, diphenyl isodecanyl phosphite, tetraphenyl dipropylene glycol diphosphite, 4,4'-bis(diethoxyphosphonomethyl)biphenyl, tris(isotridecyl) phosphite, triisodecyl phosphite, triphenyl phosphite, trioctyl phosphite, trinonylphenyl phosphite, tris(2,4-dicumylphenyl) phosphite, or tris(nonylphenol) phosphite.

[0011] In one embodiment of the present invention, the benzotriazole derivative metal deactivator L is one or more of benzotriazole and its derivatives.

[0012] In one embodiment of the present invention, the benzotriazole fatty amine oiliness agent M includes one or more of the following: benzotriazole fatty amine salt, benzotriazole fatty acid ammonium salt, N,N-dialkylaminomethylene benzotriazole, benzotriazole derivative, methyl benzotriazole derivative, benzotriazole-thiazole complex derivative, benzotriazole propylamine salt, benzotriazole-fatty acid amide complex, or benzotriazole-alkylamine complex.

[0013] In one embodiment of the present invention, the phosphate ester type extreme pressure agent N includes one or more of the following: tributyl phosphate, tripentyl phosphate, trihexyl phosphate, triheptyl phosphate, trioctyl phosphate, trinonyl phosphate, tridecyl phosphate, tri(undecyl) phosphate, tri(dodecyl) phosphate, tri(tridecyl) phosphate, tri(tetradecyl) phosphate, tri(pentadecanyl) phosphate, tri(hexadecyl) phosphate, tri(heptadecanyl) phosphate, tri(octadecyl) phosphate, trioleenyl phosphate, triphenyl phosphate, tricresyl phosphate, tri(ethylphenyl) phosphate, tri(butylphenyl) phosphate, tri(xylyl) phosphate, tri(xylyl) phosphate, toluene diphenyl phosphate, or xylyl diphenyl phosphate.

[0014] In one embodiment of the present invention, the antifoaming agent O includes one or more of N-methyl silicone oil, acrylate polymer, non-silicone antifoaming agent, polyether antifoaming agent, or composite antifoaming agent.

[0015] To achieve the above objectives, the present invention also adopts the following technical solution: a method for preparing the high-efficiency refrigeration oil composition as described above, comprising the following steps: S1: Base oil mixing: The paraffinic base oil component A, intermediate base oil component B, naphthenic base oil component C, aromatic base oil component D, aromatic ester lubricating oil component E, diester lubricating oil component F and polyol ester lubricating oil component G are added to the reaction vessel in proportion, and stirred at a rate of 150-200 r / min for 30-60 min under constant temperature of 60±5℃ to obtain a uniformly dispersed mixed base oil; S2: Additive compounding: The shielding phenolic antioxidant H, phenolic ester antioxidant I, aromatic amine antioxidant J, phosphite antioxidant K, benzotriazole derivative metal deactivator L, benzotriazole fatty amine oiliness agent M, and phosphate ester extreme pressure agent N are added sequentially to the mixed base oil. The mixture is stirred at a rate of 180-220 r / min for 1-2 h under constant temperature of 80±5℃ to obtain a mixed solution. S3: Post-treatment: Add the antifoaming agent O to the above mixture, stir for 15-30 minutes at a constant temperature of 60±5℃, then dehydrate to a moisture content ≤30ppm at a constant temperature of 60±5℃ and under negative pressure, then cool to room temperature, filter through a filter to obtain the high-efficiency refrigeration oil composition.

[0016] As described above, the high-efficiency refrigeration oil composition and its preparation method of the present invention have the following beneficial effects: Excellent high and low temperature performance: The pour point of all embodiments should be ≤-46℃, and some embodiments can reach -51℃, which is far better than the -33℃ of traditional mineral oil. It can fully meet the fluidity requirements of low temperature conditions below -30℃ and effectively avoid the failure of refrigeration system pipelines due to oil solidification and blockage. The flash point is ≥180℃, and some embodiments can reach 226℃, which has excellent high temperature stability and can stably adapt to the high temperature exhaust conditions of compressors.

[0017] Strong thermal oxidation stability: After a thermal stability test at 135°C for 168 hours (Cu, Fe, Al catalysis), the acid value and copper strip corrosion of Examples 2-5 are significantly lower than those of existing traditional mineral oils and commonly used synthetic oils (such as POE and PAG), which can effectively extend the service life of the engine oil and avoid corrosion of system components by acidic substances.

[0018] Excellent lubrication and anti-wear extreme pressure performance: Excellent lubricity ensures sufficient oil film strength even under the dilution effect of R290 refrigerant; the anti-wear extreme pressure performance of Examples 2-5 is significantly better than that of traditional mineral oils and commonly used synthetic oils (such as POE and PAG), with a maximum non-seizure load (PB) of over 588N, and a wear scar diameter of only 0.40-0.45mm under a 294N load in a four-ball test, which is much smaller than the 0.61mm or more of existing products; it is higher than that of traditional mineral oils and commonly used synthetic oils (such as POE and PAG), which can effectively reduce the wear of compressor moving parts and greatly improve the reliability of equipment operation.

[0019] Excellent compatibility with R290: The two-phase separation temperature of Examples 2-5 and Comparative Examples 1-2 is below -65℃, and the complete miscibility temperature in the actual examples is <-65℃, which is far superior to the >+10℃ (stratification) of PAG synthetic oil. There is no stratification phenomenon after long-term use, which effectively solves the technical defect of poor compatibility between PAG and R290. It has higher versatility for compressor system design and can reduce the design, development and production costs of internal structure of compressor equipment.

[0020] Excellent protection against metal corrosion: The copper sheet corrosion (100℃, 3h) rating of Examples 2-5 can reach level 1a, which is slightly better than the level 2b of traditional mineral oil. It is comparable to the level 1b of POE synthetic oil and the level 1b of PAG synthetic oil. After thermal stability test, it can still maintain excellent anti-corrosion performance, effectively protect metal parts such as copper, iron and aluminum in the refrigeration system, avoid catalytic oxidation of metal surfaces, and extend the service life of core components such as compressors.

[0021] Excellent foam control performance: In Examples 2-5, the foam tendency / foam stability values ​​were all 5 / 0 mL under the conditions of 24°C, 93.5°C and 24°C, which showed excellent defoaming performance and could effectively avoid poor lubrication caused by foam generation. In contrast, traditional mineral oils have a foam tendency of 20-30 mL at the corresponding temperatures, which may cause cavitation and other problems.

[0022] Balanced overall performance: The products in Examples 2-5 have low water absorption, with a 24-hour weight gain of only 0.03%, far lower than POE's 0.85% and PAG's 0.92%; at the same time, they have excellent electrical insulation, with a breakdown voltage as high as 65KV, far superior to POE's 31KV and PAG's 30KV. They overcome the problems of POE's strong water absorption, hydrolytic stability and poor electrical insulation, and avoid the inherent defects of PAG's poor electrical insulation caused by strong water absorption. They can be adapted to compressor systems with high electrical performance requirements.

[0023] Wide viscosity compatibility and broad applicability: The product's components can be adjusted to precisely cover mainstream refrigeration oil viscosities currently on the market, such as 22mm² / s, 32mm² / s, and 46mm² / s. More viscosity grades can also be developed to meet market demands. The product is flexibly adaptable to the operating conditions of various small and medium-sized refrigeration / heat pump equipment, including household refrigerators, commercial refrigeration equipment, and small heat pump systems. It is compatible with R290, R600a, and other natural refrigerants, aligning with the global trend of replacing refrigerants with environmentally friendly ones, and possesses broad market applicability and significant industrial application value. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A flowchart illustrating the preparation method of the high-efficiency refrigeration oil composition provided by the present invention. Detailed Implementation

[0026] This invention provides a high-efficiency refrigeration oil composition and its preparation method. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and examples. In the description of this invention, it should be understood that the terms "up," "down," "left," and "right," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the terms "installation," "connection," etc., should be interpreted broadly; those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances. Example

[0027] This invention provides a high-efficiency refrigeration oil composition, comprising a base oil and additives, wherein the base oil accounts for 93%-99% of the total mass of the composition, and the additives account for 1%-7% of the total mass of the composition. The base oil comprises the following components by mass fraction: paraffinic base oil component A with a mass fraction of 8%-35%, intermediate base oil component B with a mass fraction of 8%-35%, naphthenic base oil component C with a mass fraction of 20%-48%, aromatic base oil component D with a mass fraction of 3%-18%, aromatic ester lubricating oil component E with a mass fraction of 2%-12%, diester lubricating oil component F with a mass fraction of 0.5%-7%, and polyol ester lubricating oil component G with a mass fraction of 0.5%-7%. The paraffinic base oil component A has a viscosity of 6-12 mm² / s at 40°C, a viscosity index ≥90, a pour point ≤-35°C, and a flash point ≥170°C. The intermediate base oil component B has a viscosity of 23-33 mm² / s at 40°C, a viscosity index of 60-90, a pour point ≤-30°C, and a flash point ≥180°C. The naphthenic base oil component C has a viscosity of 48-68 mm² / s at 40°C, a viscosity index ≤30, a pour point ≤-36°C, and a flash point ≥180°C. The aromatic base oil component D has a viscosity of 20-40 mm² / s at 40°C, a viscosity index of 20-50, a pour point ≤-50°C, and a flash point ≥180°C. The aromatic ester lubricating oil component E has a viscosity of 100-130 mm² / s at 40°C, a viscosity index ≥100, a pour point ≤-40°C, and a flash point ≥250°C. The diester lubricating oil component F has a viscosity of 5-10 mm² / s at 40℃, a viscosity index ≥120, a pour point ≤-60℃, and a flash point ≥200℃; the polyol ester lubricating oil component G has a viscosity of 15-30 mm² / s at 40℃, a viscosity index ≥120, a pour point ≤-60℃, and a flash point ≥250℃.

[0028] The additive comprises the following components by mass fraction: 0.2%-1.0% of shielding phenolic antioxidant H, 0.2%-1.0% of phenolic ester antioxidant I, 0.2%-1.0% of aromatic amine antioxidant J, 0.2%-1.0% of phosphite antioxidant K, 0.05%-0.5% of benzotriazole derivative metal deactivator L, 0.05%-0.15% of benzotriazole fatty amine oiliness agent M, 0.05%-0.6% of benzotriazole, 0.7%-2.0% of phosphate ester extreme pressure agent N, and 0.002%-0.015% of antifoaming agent O.

[0029] The shielding phenolic antioxidant H includes one or more of 2,6-di-tert-butyl-p-cresol, 2,3-di-tert-butyl-4-cresol, 2,6-di-tert-butylphenol, 4,4'-tetramethylbis(2,6-di-tert-butylphenol), hydroquinone, or β-naphthol.

[0030] The phenolic ester type antioxidant I includes isooctyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], methyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, butyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 2,2'-methylenebis(4 One or more of the following: methyl-6-tert-butylphenol) propionate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione, stearate of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, pentaerythritol tetra(3,5-di-tert-butyl-4-hydroxybenzoate) or β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate isodecanol ester.

[0031] The aromatic amine antioxidant J includes one or more of octyl / butyl diphenylamine, nonyl diphenylamine, dioctyl diphenylamine, dinonyl diphenylamine, diisooctyl diphenylamine, butyloctyl diphenylamine, N-phenyl-1-naphthylamine, N-phenyl-2-naphthylamine, octylphenyl-α-naphthylamine, or 4,4'-bis(phenylisopropyl)diphenylamine.

[0032] The phosphite antioxidant K comprises one or more of the following polymers: tris(2,4-di-tert-butylphenyl) phosphite, bis(2,4-di-tert-butylphenyl)phenyl phosphite, pentaerythritol diphosphite, diphenyl isooctyl phosphite, diphenyl isodecanyl phosphite, tetraphenyl dipropylene glycol diphosphite, 4,4'-bis(diethoxyphosphonomethyl)biphenyl, tris(isotridecyl) phosphite, triisodecyl phosphite, triphenyl phosphite, trioctyl phosphite, trinonylphenyl phosphite, tris(2,4-dicumylphenyl) phosphite, or tris(nonylphenol) phosphite.

[0033] The benzotriazole derivative metal deactivator L is one or more of benzotriazole and its derivatives.

[0034] The benzotriazole fatty amine oiliness agent M includes one or more of the following: benzotriazole fatty amine salt, benzotriazole fatty acid ammonium salt, N,N-dialkylaminomethylene benzotriazole, benzotriazole derivative, methyl benzotriazole derivative, benzotriazole-thiazole complex derivative, benzotriazole propylamine salt, benzotriazole-fatty acid amide complex, or benzotriazole-alkylamine complex.

[0035] The phosphate ester type extreme pressure agent N includes one or more of the following: tributyl phosphate, tripentyl phosphate, trihexyl phosphate, triheptyl phosphate, trioctyl phosphate, trinonyl phosphate, tridecyl phosphate, tri(undecyl) phosphate, tri(dodecyl) phosphate, tri(tridecyl) phosphate, tri(tetradecyl) phosphate, tri(pentadecanyl) phosphate, tri(hexadecyl) phosphate, tri(heptadecyl) phosphate, tri(octadecyl) phosphate, trioleenyl phosphate, triphenyl phosphate, tricresyl phosphate, tri(ethylphenyl) phosphate, tri(butylphenyl) phosphate, tri(xylyl) phosphate, tri(xylyl) phosphate, toluene diphenyl phosphate, or xylyl diphenyl phosphate.

[0036] The antifoaming agent O includes one or more of N-methyl silicone oil, acrylate polymers, non-silicone antifoaming agents, polyether-type antifoaming agents, or composite antifoaming agents.

[0037] Please see Figure 1 This invention provides a method for preparing the high-efficiency refrigeration oil composition as described above, comprising the following steps: S1: Base oil mixing: The paraffinic base oil component A, intermediate base oil component B, naphthenic base oil component C, aromatic base oil component D, aromatic ester lubricating oil component E, diester lubricating oil component F, and polyol ester lubricating oil component G are added to a reaction vessel in proportion, and stirred at a rate of 150-200 r / min for 30-60 min under constant temperature of 60±5℃ to obtain a uniformly dispersed mixed base oil; S2: Additive compounding: The shielding phenolic antioxidant is added sequentially to the mixed base oil. H, phenolic ester antioxidant I, aromatic amine antioxidant J, phosphite antioxidant K, benzotriazole derivative metal deactivator L, benzotriazole fatty amine oiliness agent M, and phosphate ester extreme pressure agent N are stirred at a rate of 180-220 r / min for 1-2 h at a constant temperature of 80±5℃ to obtain a mixture; S3: Post-treatment: the antifoaming agent O is added to the above mixture, and the mixture is stirred at a constant temperature of 60±5℃ for 15-30 min. Then, it is dehydrated at a constant temperature of 60±5℃ under negative pressure until the water content is ≤30ppm, and then cooled to room temperature. The mixture is then filtered through a filter to obtain the high-efficiency refrigeration oil composition. Example

[0038] Based on Example 1, the composition of this example is as follows: Base oil components (mass fraction): paraffinic base oil component A accounts for 17.66% of the total mass of the composition, intermediate base oil component accounts for 21.58% of the total mass of the composition, naphthenic base oil component C accounts for 36.29% of the total mass of the composition, aromatic base oil component D accounts for 8.83% of the total mass of the composition, aromatic ester lubricating oil component E accounts for 5.89% of the total mass of the composition, diester lubricating oil component F accounts for 2.94% of the total mass of the composition, and polyol ester lubricating oil component G accounts for 4.90% of the total mass of the composition; Additive components: 0.29% by weight of shielding phenolic antioxidant H, 0.20% by weight of phenolic ester antioxidant I, 0.20% by weight of phenolic ester antioxidant J, 0.20% by weight of amine antioxidant J, 0.10% by weight of phosphite antioxidant K, 0.49% by weight of benzotriazole derivative metal deactivator L, 0.98% by weight of benzotriazole fatty amine oiliness agent M, 1.0% by weight of phosphate ester extreme pressure agent N, and 0.005% by weight of antifoaming agent O.

[0039] The specific preparation process is as follows: S1: Base oil mixing, stirring at 180 r / min for 45 min under constant temperature of 60℃; S2: Additive compounding, stirring at 200 r / min for 1.2 h under constant temperature of 80℃; S3: Defoaming, dehydration and filtration, adding antifoaming agent O at 60℃ and stirring for 25 min, then dehydrating to below 30 ppm water content at 60℃ and negative pressure, then cooling to room temperature and filtering through a 10 μm precision filter to obtain a high-efficiency refrigeration oil composition.

[0040] Example 3: Based on Example 1, the composition of this example is as follows: Base oil components (mass fraction): Paraffinic base oil component A accounts for 15.69% of the total mass of the composition, intermediate base oil component B accounts for 25.50% of the total mass of the composition, naphthenic base oil component C accounts for 31.39% of the total mass of the composition, aromatic base oil component D accounts for 10.79% of the total mass of the composition, aromatic ester lubricating oil component E accounts for 6.87% of the total mass of the composition, diester lubricating oil component F accounts for 3.92% of the total mass of the composition, and polyol ester lubricating oil component G accounts for 3.92% of the total mass of the composition; Additive components: 0.29% by weight of shielding phenolic antioxidant H, 0.20% by weight of phenolic ester antioxidant I, 0.20% by weight of phenolic ester antioxidant J, 0.20% by weight of amine antioxidant J, 0.10% by weight of phosphite antioxidant K, 0.049% by weight of benzotriazole derivative metal deactivator L, 0.098% by weight of benzotriazole fatty amine oiliness agent M, 0.98% by weight of phosphate ester extreme pressure agent N, and 0.005% by weight of antifoaming agent O.

[0041] The specific preparation process is as follows: S1: Base oil mixing, stirring at a rate of 170 r / min for 50 min under constant temperature of 60℃; S2: Additive compounding, stirring at a rate of 210 r / min for 1.5 h under constant temperature of 80℃; S3: Defoaming, dehydration and filtration, adding antifoaming agent O at 60℃ and stirring for 20 min, then dehydrating to below 30 ppm water content under negative pressure at 60℃, and then cooling to room temperature and filtering through a 10 μm precision filter to obtain a high-efficiency refrigeration oil composition. Example

[0042] Based on Example 1, the composition of this example is as follows: Base oil components (mass fraction): Paraffinic base oil component A accounts for 23.54% of the total mass of the composition, intermediate base oil component B accounts for 15.69% of the total mass of the composition, naphthenic base oil component C accounts for 38.25% of the total mass of the composition, aromatic base oil component D accounts for 6.87% of the total mass of the composition, aromatic ester lubricating oil component E accounts for 4.9% of the total mass of the composition, diester lubricating oil component F accounts for 1.96% of the total mass of the composition, and polyol ester lubricating oil component G accounts for 6.87% of the total mass of the composition; Additive components: 0.29% by weight of shielding phenolic antioxidant H, 0.20% by weight of phenolic ester antioxidant I, 0.20% by weight of phenolic ester antioxidant J, 0.20% by weight of amine antioxidant J, 0.10% by weight of phosphite antioxidant K, 0.05% by weight of benzotriazole derivative metal deactivator L, 0.10% by weight of benzotriazole fatty amine oiliness agent M, 0.98% by weight of phosphate ester extreme pressure agent N, and 0.005% by weight of antifoaming agent O.

[0043] The specific preparation process is as follows: S1: Base oil mixing, stirring at 190 r / min for 35 min under constant temperature of 60℃; S2: Additive compounding, stirring at 190 r / min for 1.8 h under constant temperature of 80℃; S3: Defoaming, dehydration and filtration, adding antifoaming agent O at 60℃ and stirring for 18 min, then dehydrating to below 30 ppm water content at 60℃ and negative pressure, then cooling to room temperature and filtering through a 10 μm precision filter to obtain a high-efficiency refrigeration oil composition. Example

[0044] Based on the above embodiments, this embodiment provides the following comparative products: Comparative Example 1 (Single Mineral Oil) Base oil: Single mineral oil (paraffinic and naphthenic oils mixed in a 1:1 mass ratio), accounting for 99.8%; Additive: 2,6-di-tert-butyl-p-cresol, accounting for 0.2%; Preparation process: Same as in Example 1.

[0045] Comparative Example 2 (POE Synthetic Oil) Base oil: Polyester oil (POE), accounting for 99.8%; Additive: 2,6-di-tert-butyl-p-cresol, accounting for 0.2%; Preparation process: Same as in Example 1.

[0046] Comparative Example 3 (PAG Synthetic Oil) Base oil: Polyalkylene glycol (PAG), accounting for 99.8%; Additive: 2,6-di-tert-butyl-p-cresol, accounting for 0.2%; Preparation process: Same as in Example 1.

[0047] The performance test results of the above products are shown in Table 1: Table 1: Product Performance Test Results Test Project Example 2 Example 3 Example 4 Comparative Example 1 (Mineral Oil) Comparative Example 2 (POE) Comparative Example 3 (PAG) Test methods Properties clear liquid clear liquid clear liquid clear liquid clear liquid clear liquid Visual inspection Color, number ＜0.5 ＜0.5 ＜0.5 ＜0.5 ＜0.5 ＜0.5 GB / T6540 Kinematic viscosity (40℃), mm² / s 22.30 32.21 46.89 21.62 22.55 46.50 GB / T265 Pour point, ℃ -51 -48 -46 -33 -55 -45 GB / T3535 Flash point (open cup), °C 200 220 226 175 240 226 GB / T3536 Acid value, mgKOH / g 0.01 0.02 0.02 0.02 0.02 0.02 GB / T4945 Copper sheet corrosion (100℃, 3h), grade 1a 1a 1a 2b 1b 1b GB / T5096 Breakdown voltage, kV 65 65 65 40 31 30 GB / T507 Foaming property (foaming tendency / foam stability), mL / mL Initial 24℃: 93.5℃ Subsequent 24℃: 93.5℃ 5 / 05 / 05 / 0 5 / 05 / 05 / 0 5 / 05 / 05 / 0 20 / 030 / 020 / 0 10 / 010 / 010 / 0 15 / 010 / 010 / 0 GB / T12579 Aniline point, ℃ 75.6 76.0 76.5 98.6 ＜25 ＜25 GB / T262 Miscibility with refrigerant, (R290, 20%) °C ＜-65 ＜-65 ＜-65 ＜-65 ＜-60 ＞+10 SH / T0699 Lubricity PB,N four-ball test wear scar diameter (294N), mm 6180.44 6180.45 6180.40 3050.96 3140.79 5490.61 GB / T3142 Chemical stability 96 96 96 96 96 96 SH / T0104 Thermal stability (135℃, 168h, Cu, Fe, Al) test conditions: acid value, mgKOH / gCu, grade; Fe, grade; Al, grade. No change 0.031a No corrosion No corrosion No change 0.031b No corrosion No corrosion No change 0.031b No corrosion No corrosion No change 0.102c No corrosion No corrosion It has a pungent odor. 0.113b. It is non-corrosive. No change 0.891b No corrosion No corrosion ASTM D2070 Water absorption (24h), weight gain % 0.03 0.03 0.03 0.03 0.85 0.92 Gravimetric method All components used in the embodiments are commercially available industrial-grade products, and the performance testing methods were performed in accordance with national or industry standards. The scope of protection of this invention is not limited by the following embodiments. Specific test items and corresponding test standards are as follows: 1. Characteristics: Visual inspection; 2. Color: Perform according to GB / T6540 "Determination of Color of Petroleum Products"; 3. Kinematic viscosity: Performed in accordance with GB / T265 "Determination of Kinematic Viscosity and Calculation of Dynamic Viscosity of Petroleum Products"; 4. Pour point: Performed in accordance with GB / T3535 "Determination of Pour Point of Petroleum Products"; 5. Flash point: Performed according to GB / T3536 "Determination of flash point and fire point of petroleum products - Cleveland open cup method"; 6. Acid value: Perform according to GB / T4945 "Determination of Acid Value of Petroleum Products"; 7. Copper strip corrosion: Perform the test according to GB / T5096 "Test Method for Copper Strip Corrosion of Petroleum Products"; 8. Breakdown voltage: Performed in accordance with GB / T507 "Determination of Breakdown Voltage of Insulating Oil"; 9. Foaming property: Performed in accordance with GB / T12579 "Determination of Foaming Properties of Lubricating Oils"; 10. Aniline point: Performed in accordance with GB / T262 "Determination of Aniline Point in Petroleum Products"; 11. Compatibility with R290: Perform according to SH / T0699 "Test Method for Compatibility of Refrigeration Oil and Refrigerant"; 12. Wear scar diameter in four-ball test: Refer to GB / T3142 "Determination of Lubricant Carrying Capacity (Four-ball Method)"; 13. Chemical stability: Performed in accordance with SH / T0104 "Stability Test Method of Refrigeration Oils under the Action of Refrigerants (Phillips Method)"; 14. Thermal stability: Perform according to ASTM D2070 "Standard Test Method for Thermal Stability of Hydraulic Oils"; 15. Water absorption: The weight gain rate shall be tested for 24 hours at 25°C and 60%RH by gravimetric method. Performance Comparison Analysis between Example 2 and Comparative Example 1 (Single Mineral Oil): A comparison of the test data from Example 2 and Comparative Example 1 shows that the technical solution of this invention, which combines multi-component base oil blending with multifunctional additives, achieves significant improvements in core performance indicators. Pour point performance: The pour point of Example 2 is as low as -51℃, which is far better than that of Comparative Example 1 (-33℃). It can meet the flow requirements of low-temperature operating conditions and effectively avoid the failure of refrigeration system pipelines due to oil solidification and blockage. Copper sheet corrosion protection: The copper sheet corrosion level in Example 2 is 1a, which is significantly better than 2b in Comparative Example 1, indicating that it has a better anti-corrosion protection capability for metal parts in the refrigeration system and can extend the service life of core components such as compressors. Foam control performance: The foam tendency / stability of Example 2 under the conditions of 24℃, 93.5℃ and 24℃ were all 5 / 0mL, while the foam tendency / stability of Comparative Example 1 at the corresponding temperatures were 20 / 0mL, 30 / 0mL and 20 / 0mL, respectively. This shows that Example 2 has better defoaming performance and can avoid problems such as cavitation caused by foam generation. Lubrication performance: The maximum non-seize load (PB) of Example 2 reached 618N, and the wear scar diameter in the four-ball test under a load of 294N was only 0.44mm, while the PB of Comparative Example 1 was only 305N, with a corresponding wear scar diameter of 0.96mm. This shows that the lubrication performance and anti-wear extreme pressure performance of Example 2 are significantly improved. Thermal stability performance: After a thermal stability test at 135℃ for 168 hours, the acid value of Example 2 only increased to 0.03 mg KOH / g, and the copper strip corrosion grade remained at 1a. In contrast, the acid value of Comparative Example 1 increased to 0.10 mg KOH / g, and the copper strip corrosion grade reached 2c. This indicates that Example 2 has better thermal oxidation stability, which can reduce the formation of sludge and acidic substances under high temperature conditions and extend the service life of the oil.

[0048] The aforementioned performance improvements are all due to the synergistic blending of multi-component base oils such as paraffin-based, intermediate-based, and naphthenic-based base oils in this invention, as well as the precise proportioning of shielding phenolic, phenolic ester, and aromatic amine antioxidants with multifunctional additives such as metal deactivators and extreme pressure agents. Each component plays a synergistic role, making up for the performance shortcomings of single mineral oils.

[0049] Performance Comparison Analysis between Example 2 and Comparative Example 2 (POE Synthetic Oil): A comparison of test data between Example 2 and Comparative Example 2 (POE synthetic oil) shows that Example 2, while avoiding the inherent defects of POE, achieves optimized and improved key performance indicators. Water absorption and hydrolytic stability: Due to its molecular structure, POE has extremely strong water absorption. The 24-hour weight gain rate of Comparative Example 2 reached 0.85%, while that of Example 2 was only 0.03%. Moreover, POE is prone to hydrolysis. The acidic substances produced by hydrolysis will aggravate metal corrosion. After the thermal stability test, the acid value increased to 0.11 mg KOH / g, and the corrosion grade of the copper sheet further deteriorated to 3b. Furthermore, an irritating odor was produced after the chemical stability test. In contrast, the corrosion grade of the copper sheet in Example 2 remained at 1a, and the acid value after the thermal stability test was only 0.03 mg KOH / g, with no irritating odor produced. Lubrication performance: The PB value of Example 2 is 588N, and the wear scar diameter is 0.44mm under a load of 294N. In contrast, the PB value of Comparative Example 2 is 314N, and the corresponding wear scar diameter is 0.79mm. This indicates that Example 2, through the synergistic optimization of base oil and additives, has significantly better lubrication performance than POE synthetic oil and can better meet the anti-wear requirements of the compressor.

[0050] Performance comparison analysis between Example 2 and Comparative Example 3 (PAG synthetic oil): The test data comparison between Example 2 and Comparative Example 3 (PAG synthetic oil) shows that Example 2 has significant advantages in terms of compatibility, lubricity, and electrical properties. Compatibility with R290 refrigerant: Example 2 exhibits complete miscibility with R290 refrigerant at a temperature < -65℃, and shows no stratification after long-term use. In contrast, Comparative Example 3 has a miscibility temperature > +10℃, and is prone to stratification. This complete miscibility characteristic makes Example 2 more versatile in compressor system design, eliminating the need for special system structural designs like PAG, thus reducing equipment R&D and production costs and broadening application scenarios. Lubrication performance: The PB value of Example 2 is 618N, and the wear scar diameter is 0.44mm under a load of 294N. The PB value of Comparative Example 3 is 549N, and the corresponding wear scar diameter is 0.61mm. This shows that after the base oil is compounded and the additives are optimized, the anti-wear extreme pressure performance of Example 2 is improved compared with Comparative Example 3, which can effectively reduce the wear of compressor components. Thermal stability performance: After a thermal stability test at 135℃ for 168h, the acid value of Example 2 only increased to 0.03mgKOH / g, while the acid value of Comparative Example 3 increased to 0.89mgKOH / g. This indicates that Example 2 has better thermal oxidation stability, which can reduce the formation of sludge and acidic substances under high temperature conditions and can adapt to long-term high temperature operation conditions. In addition, since most PAG synthetic oils on the market adopt a single-end structure, there are unsaturated bonds between molecules, which leads to the poor stability of Comparative Example 3. Electrical performance compatibility: Due to its high water absorption (the comparative example has a weight gain rate of 0.92% over 324 hours), PAG has a breakdown voltage of only 30KV, while the breakdown voltage of Example 2 is as high as 65KV. It has excellent electrical insulation properties and can be adapted to compressor systems with high electrical performance requirements, thus solving the application limitations of PAG in high electrical performance demand scenarios.

[0051] Viscosity compatibility descriptions for Examples 2 to 4: Examples 2, 3, and 4 correspond to three products with kinematic viscosities of 22.30 mm² / s, 32.21 mm² / s, and 46.89 mm² / s at 40℃, respectively. These products accurately cover the mainstream refrigeration oil viscosity grades currently on the market and can flexibly adapt to the operating conditions of different small and medium-sized refrigeration / heat pump equipment such as household refrigerators, commercial refrigeration equipment, and small heat pump systems, thus possessing broad market applicability.

[0052] In conclusion, this invention, through the synergistic design of a multi-component composite base oil system and multifunctional additives, produces a high-efficiency refrigeration oil composition that exhibits excellent performance in high and low temperature performance, thermal oxidation stability, anti-wear and extreme pressure properties, compatibility with R290 refrigerant, and overall performance balance. Examples 2, 3, and 4 cover mainstream viscosity grades of 22 mm² / s, 32 mm² / s, and 46 mm² / s, respectively, meeting the operating requirements of various small and medium-sized refrigeration / heat pump equipment. Compared with traditional single mineral oils, POE synthetic oils, and PAG synthetic oils, the product of this invention effectively overcomes the performance defects of existing products, especially adapting to the usage requirements of natural refrigerants such as R290, aligning with the global trend of environmentally friendly refrigerant replacement, and possessing significant industrial application value.

[0053] In summary, the high-efficiency refrigeration oil composition and its preparation method of the present invention, through the synergistic optimization design of multi-component base oils and additives, effectively overcome many performance shortcomings of existing refrigeration oils and commonly used synthetic oils when adapted to natural refrigerants such as R290. It not only significantly improves low-temperature fluidity and enhances high-temperature oxidation stability, effectively inhibiting sludge accumulation and greatly extending lubrication life, but also enhances compatibility with natural refrigerants, solving the problems of high water absorption and poor electrical insulation in some products. Furthermore, the composition optimizes foam control capabilities, effectively reducing the adverse effects of foam on refrigeration system operation, strengthening corrosion protection for metal components, and significantly improving overall wear protection and anti-wear extreme pressure performance, thus comprehensively ensuring the stable operation of key components in the refrigeration system. Overall, the high-efficiency refrigeration oil composition exhibits excellent comprehensive performance and wider compatibility, providing reliable lubrication for refrigeration systems using natural refrigerants such as R290, helping to improve the overall system operating efficiency and service life, and possessing significant practical value and application advantages. Therefore, the present invention effectively overcomes the technical defects in the prior art and has important industrial application value.

[0054] It is understood that those skilled in the art can make equivalent substitutions or changes to the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A high-efficiency refrigeration oil composition, characterized in that, It consists of base oil and additives, wherein the base oil accounts for 93%-99% of the total mass of the composition, and the additives account for 1%-7% of the total mass of the composition; The base oil comprises the following components by mass fraction: paraffinic base oil component A with a mass fraction of 8%-35%, intermediate base oil component B with a mass fraction of 8%-35%, naphthenic base oil component C with a mass fraction of 20%-48%, aromatic base oil component D with a mass fraction of 3%-18%, aromatic ester lubricating oil component E with a mass fraction of 2%-12%, diester lubricating oil component F with a mass fraction of 0.5%-7%, and polyol ester lubricating oil component G with a mass fraction of 0.5%-7%. The additive comprises the following components by mass fraction: 0.2%-1.0% of shielding phenolic antioxidant H, 0.2%-1.0% of phenolic ester antioxidant I, 0.2%-1.0% of aromatic amine antioxidant J, 0.2%-1.0% of phosphite antioxidant K, 0.05%-0.5% of benzotriazole derivative metal deactivator L, 0.05%-0.15% of benzotriazole fatty amine oiliness agent M, 0.05%-0.6% of benzotriazole, 0.7%-2.0% of phosphate ester extreme pressure agent N, and 0.002%-0.015% of antifoaming agent O.

2. The high-efficiency refrigeration oil composition according to claim 1, characterized in that, The shielding phenolic antioxidant H includes one or more of 2,6-di-tert-butyl-p-cresol, 2,3-di-tert-butyl-4-cresol, 2,6-di-tert-butylphenol, 4,4'-tetramethylbis(2,6-di-tert-butylphenol), hydroquinone, or β-naphthol.

3. The high-efficiency refrigeration oil composition according to claim 1, characterized in that, The phenolic ester type antioxidant I includes isooctyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], methyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, butyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 2,2'-methylenebis(4 One or more of the following: methyl-6-tert-butylphenol) propionate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione, stearate of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, pentaerythritol tetra(3,5-di-tert-butyl-4-hydroxybenzoate) or β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate isodecanol ester.

4. The high-efficiency refrigeration oil composition according to claim 1, characterized in that, The aromatic amine antioxidant J includes one or more of octyl / butyl diphenylamine, nonyl diphenylamine, dioctyl diphenylamine, dinonyl diphenylamine, diisooctyl diphenylamine, butyloctyl diphenylamine, N-phenyl-1-naphthylamine, N-phenyl-2-naphthylamine, octylphenyl-α-naphthylamine, or 4,4'-bis(phenylisopropyl)diphenylamine.

5. The high-efficiency refrigeration oil composition according to claim 1, characterized in that, The phosphite antioxidant K comprises one or more of the following polymers: tris(2,4-di-tert-butylphenyl) phosphite, bis(2,4-di-tert-butylphenyl)phenyl phosphite, pentaerythritol diphosphite, diphenyl isooctyl phosphite, diphenyl isodecanyl phosphite, tetraphenyl dipropylene glycol diphosphite, 4,4'-bis(diethoxyphosphonomethyl)biphenyl, tris(isotridecyl) phosphite, triisodecyl phosphite, triphenyl phosphite, trioctyl phosphite, trinonylphenyl phosphite, tris(2,4-dicumylphenyl) phosphite, or tris(nonylphenol) phosphite.

6. The high-efficiency refrigeration oil composition according to claim 1, characterized in that, The benzotriazole derivative metal deactivator L is one or more of benzotriazole and its derivatives.

7. The high-efficiency refrigeration oil composition according to claim 1, characterized in that, The benzotriazole fatty amine oiliness agent M includes one or more of the following: benzotriazole fatty amine salt, benzotriazole fatty acid ammonium salt, N,N-dialkylaminomethylene benzotriazole, benzotriazole derivative, methyl benzotriazole derivative, benzotriazole-thiazole complex derivative, benzotriazole propylamine salt, benzotriazole-fatty acid amide complex, or benzotriazole-alkylamine complex.

8. The high-efficiency refrigeration oil composition according to claim 1, characterized in that, The phosphate ester type extreme pressure agent N includes one or more of the following: tributyl phosphate, tripentyl phosphate, trihexyl phosphate, triheptyl phosphate, trioctyl phosphate, trinonyl phosphate, tridecyl phosphate, tri(undecyl) phosphate, tri(dodecyl) phosphate, tri(tridecyl) phosphate, tri(tetradecyl) phosphate, tri(pentadecanyl) phosphate, tri(hexadecyl) phosphate, tri(heptadecyl) phosphate, tri(octadecyl) phosphate, trioleenyl phosphate, triphenyl phosphate, tricresyl phosphate, tri(ethylphenyl) phosphate, tri(butylphenyl) phosphate, tri(xylyl) phosphate, tri(xylyl) phosphate, toluene diphenyl phosphate, or xylyl diphenyl phosphate.

9. The high-efficiency refrigeration oil composition according to claim 1, characterized in that, The antifoaming agent O includes one or more of N-methyl silicone oil, acrylate polymers, non-silicone antifoaming agents, polyether-type antifoaming agents, or composite antifoaming agents.

10. A method for preparing a high-efficiency refrigeration oil composition as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Base oil mixing: The paraffinic base oil component A, intermediate base oil component B, naphthenic base oil component C, aromatic base oil component D, aromatic ester lubricating oil component E, diester lubricating oil component F and polyol ester lubricating oil component G are added to the reaction vessel in proportion, and stirred at a rate of 150-200 r / min for 30-60 min under constant temperature of 60±5℃ to obtain a uniformly dispersed mixed base oil; S2: Additive compounding: The shielding phenolic antioxidant H, phenolic ester antioxidant I, aromatic amine antioxidant J, phosphite antioxidant K, benzotriazole derivative metal deactivator L, benzotriazole fatty amine oiliness agent M, and phosphate ester extreme pressure agent N are added sequentially to the mixed base oil. The mixture is stirred at a rate of 180-220 r / min for 1-2 h under constant temperature of 80±5℃ to obtain a mixed solution. S3: Post-treatment: Add the antifoaming agent O to the above mixture, stir for 15-30 minutes at a constant temperature of 60±5℃, then dehydrate to a moisture content ≤30ppm at a constant temperature of 60±5℃ and under negative pressure, then cool to room temperature, filter through a filter to obtain the high-efficiency refrigeration oil composition.

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