CN107686769B

CN107686769B - Refrigerating machine oil and preparation method thereof

Info

Publication number: CN107686769B
Application number: CN201710943055.XA
Authority: CN
Inventors: 李潘源; 吴旭东; 赵玉贞; 欧阳睿熙
Original assignee: China Petroleum and Chemical Corp
Current assignee: China Petroleum and Chemical Corp
Priority date: 2017-10-11
Filing date: 2017-10-11
Publication date: 2020-09-08
Anticipated expiration: 2037-10-11
Also published as: CN107686769A

Abstract

The invention provides a refrigerator oil and a preparation method thereof. The refrigerating machine oil provided by the invention comprises 49-79 wt% of polyvinyl methyl ether base oil, 20-50 wt% of polyvinyl ethyl ether base oil and 1-5 wt% of functional additive; the functional additive comprises one or more of an antiwear agent, a metal deactivator, an antirust agent, an antioxidant, an antifoaming agent and an acid trapping agent. The refrigerating machine oil and the R32 refrigerant provided by the invention have good intermiscibility in a high-low temperature range, and can meet the requirements that the critical intersolubility temperature in the low temperature range is not higher than-20 ℃ and the critical intersolubility temperature in the high temperature range is not lower than 40 ℃; meanwhile, the lubricating grease also has good chemical stability and corrosion resistance, and meets various indexes of the refrigerator oil. The preparation method provided by the invention is simple and easy to operate, can conveniently regulate and control the performance by simply changing the proportion of the raw materials, and is suitable for large-scale production and application.

Description

Refrigerating machine oil and preparation method thereof

Technical Field

The invention relates to the technical field of petrochemical industry, in particular to refrigerator oil and a preparation method thereof.

Background

The refrigerant is a working substance which continuously circulates in the refrigeration system and realizes refrigeration through the state change of the refrigerant, and is the key of the refrigeration system for generating the refrigeration effect. With the increasing severity of the problems of the ozone layer thinning and the greenhouse effect, people pay attention to and dislike the natural ecological environment problem, so that the use of the refrigerant of the hydrofluoro chlorine compound (HCFC) and the hydrofluorocarbon (CFC) is reexamined. In order to protect the ecological environment on which human beings rely for survival, international society has taken a series of conferences and established relevant convention such as the kyoto protocol, the montreal protocol and the like to limit and restrict the use of traditional refrigerants, so that the selective use and development of environmentally friendly refrigerants is a great trend in the refrigeration industry.

Wherein R32 refrigerant (i.e., difluoromethane, CH)₂F₂) It is considered to be an environmentally friendly refrigerant having a great potential for use in home air conditioners, which has zero ozone depletion potential (i.e., ODP), low Global Warming Potential (GWP), and excellent refrigeration performance, and is non-toxic and slightly flammable, and thus R32 will be the mainstream refrigerant widely used in home air conditioners for a considerable period of time in the future.

The refrigerant in the refrigeration system needs to be matched with refrigerating machine oil to realize system operation, and the refrigerating machine oil is selected by taking the refrigerant as a reference and needs to be matched with the refrigerant. Specifically, a refrigeration system usually comprises at least four parts, namely a compressor, a condenser, an expansion valve and an evaporator, and in order to ensure normal and stable operation of the refrigeration system, the refrigeration oil and the refrigerant are usually required not to be separated in a wide temperature range, and the refrigeration oil and the refrigerant can circularly flow in the refrigeration system in a homogeneous phase manner; if the refrigerant oil and the refrigerant are phase-separated in the refrigeration cycle, the refrigerant oil may have adverse effects on various aspects such as the refrigeration efficiency and the service life of the refrigeration system, for example, if the phase separation occurs in the compressor in a high-temperature environment, the refrigerant oil may cause poor lubrication of moving parts in the compressor; if the phase separation occurs in the evaporator in a low temperature environment, the refrigerating machine oil with high viscosity stays and adheres to the evaporator, thereby affecting the heat transfer efficiency. Therefore, the fact that the refrigerating machine oil can have good compatibility with R32 is the key point for realizing the matching use with R32.

However, various refrigerator oils such as polyvinyl ether (PVE), Polyether (PAG) and Polyester (POE) used together with R22 refrigerant and R410a refrigerant at present have poor compatibility with R32 refrigerant, and cannot meet the requirements and requirements that the critical miscible temperature in the low temperature range is not higher than-20 ℃ and the critical miscible temperature in the high temperature range is not lower than 40 ℃. For example, patent application No. 201380050447.3 discloses a refrigerator oil based on a polyvinyl ether polymer having a carbon/oxygen molar ratio of 3.0 to 4.0, wherein the refrigerator oil has a critical solution temperature of not higher than-20 ℃ in a low temperature range but has a poor compatibility in a high temperature range with an R32 refrigerant; in addition, the polymer base oil has a specific polymerization structure disclosed by the polymer base oil, the carbon/oxygen molar ratio is strictly controlled to be 3.0-4.0, the raw material ratio and the process conditions are strictly controlled to obtain the obtained polymerization structure and the specific carbon/oxygen molar ratio, the preparation process is very strict, and when the carbon/oxygen molar ratio is adjusted to be 3.0-4.0 according to actual use requirements to obtain products with different carbon/oxygen ratios, the whole base oil preparation process needs to be adjusted, so that the preparation is very complicated, the production cost is high, and the polymer base oil is not suitable for large-scale production.

Disclosure of Invention

In view of the above, the present invention provides a refrigerator oil and a preparation method thereof, wherein the refrigerator oil and an R32 refrigerant provided by the present invention have good compatibility in high and low temperature ranges, and can satisfy the requirements that the critical solution temperature in the low temperature range is not higher than-20 ℃ and the critical solution temperature in the high temperature range is not lower than 40 ℃. The preparation method provided by the invention is simple and easy to operate, can conveniently regulate and control the performance by simply changing the proportion of the raw materials, and is suitable for large-scale production and application.

The invention provides a refrigerator oil which comprises the following components:

49-79 wt% of polyvinyl methyl ether base oil;

20-50 wt% of polyvinyl ether base oil;

1 wt% -5 wt% of functional additive;

the functional additive comprises one or more of an antiwear agent, a metal deactivator, an antirust agent, an antioxidant, an antifoaming agent and an acid trapping agent.

Preferably, the kinematic viscosity of the polyvinyl methyl ether base oil at 40 ℃ is 60-75 mm²/s。

Preferably, the kinematic viscosity of the polyvinyl ethyl ether base oil at 40 ℃ is 60-75 mm²/s。

Preferably, the antiwear agent is selected from one or more of a sulfur-containing antiwear agent and a phosphorus-containing antiwear agent;

the metal deactivator is selected from one or more of benzotriazole derivatives and thiadiazole derivatives.

Preferably, the antirust agent is selected from one or more of organic carboxylic acid antirust agents, organic carboxylate antirust agents, sulfonate antirust agents and heterocyclic compound antirust agents;

the antioxidant is selected from one or more of amine antioxidants and phenol antioxidants.

Preferably, the anti-foaming agent is selected from one or more of silicone anti-foaming agents, polyether anti-foaming agents and composite anti-foaming agents.

Preferably, the acid scavenger is a glycidyl ester compound.

Preferably, the functional additives include an antiwear agent, a metal deactivator, a rust inhibitor, an antioxidant, an anti-foaming agent, and an acid scavenger.

Preferably, the content of each component in the functional additive in the refrigerator oil is as follows:

the invention also provides a preparation method of the refrigerator oil in the technical scheme, which comprises the following steps:

a) mixing polyvinyl methyl ether base oil and polyvinyl ethyl ether base oil to obtain mixed base oil;

b) and mixing the mixed base oil with a functional additive to obtain the refrigerator oil.

The invention provides a refrigerator oil, which comprises 49-79 wt% of polyvinyl methyl ether base oil, 20-50 wt% of polyvinyl ethyl ether base oil and 1-5 wt% of functional additive; the functional additive comprises one or more of an antiwear agent, a metal deactivator, an antirust agent, an antioxidant, an antifoaming agent and an acid trapping agent. The refrigerating machine oil and the R32 refrigerant provided by the invention have good intermiscibility in a high-low temperature range, and can meet the requirements that the critical intersolubility temperature in the low temperature range is not higher than-20 ℃ and the critical intersolubility temperature in the high temperature range is not lower than 40 ℃; meanwhile, the lubricating grease also has good chemical stability and corrosion resistance, and meets various indexes of the refrigerator oil. The invention also provides a preparation method of the refrigerator oil, which is simple and easy to operate, can conveniently regulate and control the performance by simply changing the proportion of the raw materials, and is suitable for large-scale production and application.

Detailed Description

49-79 wt% of polyvinyl methyl ether base oil;

20-50 wt% of polyvinyl ether base oil;

1 wt% -5 wt% of functional additive;

The refrigerating machine oil provided by the invention comprises base oil of polyvinyl methyl ether (also called polyvinyl methyl ether); the content of the polyvinyl methyl ether base oil in the refrigerator oil is 49 wt% to 79 wt%, specifically 49 wt%, 55 wt%, 60 wt%, 61 wt%, 61.39 wt%, 62 wt%, 65 wt%, 70 wt%, 75 wt%, 75.93 wt%, 76 wt%, 77 wt%, 78 wt% or 79 wt%. In the invention, the optimized polyvinyl methyl ether base oil has the kinematic viscosity of 60-75 mm at 40 DEG C²A specific value of 60 mm/s²/s、61mm²/s、62mm²/s、63mm²/s、64mm²/s、65mm²/s、66mm²/s、67mm²/s、68mm²/s、69mm²/s、70mm²/s、71mm²/s、72mm²/s、73mm²/s、74mm²S or 75mm²In the above viscosity range, good compatibility and good lubricity with the R32 refrigerant can be ensured, and when the viscosity is too high, compatibility with the R32 refrigerant is poor, and when the viscosity is too low, lubricity is poor, and normal use is difficult to ensure. In one embodiment of the present invention, the content of the polyvinylmethylether base oil in the refrigerator oil is 49 wt%, and the kinematic viscosity at 40 ℃ of the polyvinylmethylether base oil is 75mm²And s. In another embodiment provided by the present invention, the content of the polyvinylmethylether base oil in the refrigerator oil is 75.93 wt%, and the kinematic viscosity at 40 ℃ of the polyvinylmethylether base oil is 60mm²And s. In another embodiment provided by the present invention, the content of the polyvinylmethylether base oil in the refrigerator oil is 61.39 wt%, and the kinematic viscosity at 40 ℃ of the polyvinylmethylether base oil is 70mm²And s. The source of the polyvinyl methyl ether base oil is not particularly limited in the invention, and the polyvinyl methyl ether base oil can be prepared according to a preparation method known in the field, for example, vinyl methyl ether is initiated to polymerize under the action of an initiator to obtainTo polyvinylmethylether.

The refrigerating machine oil provided by the invention also comprises polyvinyl ethyl ether (also called polyvinyl ethyl ether) base oil; the content of the polyvinyl ethyl ether base oil in the refrigerator oil is 20 wt% -50 wt%, and specifically can be 20 wt%, 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, 47 wt%, 47.34 wt%, 48 wt% or 50 wt%. In the invention, the optimized polyvinyl ethyl ether base oil has the kinematic viscosity of 60-75 mm at 40 DEG C²A specific value of 60 mm/s²/s、61mm²/s、62mm²/s、63mm²/s、64mm²/s、65mm²/s、66mm²/s、67mm²/s、68mm²/s、69mm²/s、70mm²/s、71mm²/s、72mm²/s、73mm²/s、74mm²S or 75mm²In the above viscosity range, good compatibility and good lubricity with the R32 refrigerant can be ensured, and when the viscosity is too high, compatibility with the R32 refrigerant is poor, and when the viscosity is too low, lubricity is poor, and normal use is difficult to ensure. In one embodiment provided by the present invention, the content of the polyvinyl ethyl ether base oil in the refrigerator oil is 47.34 wt%, and the kinematic viscosity at 40 ℃ of the polyvinyl ethyl ether base oil is 60mm²And s. In another embodiment provided by the present invention, the content of the polyvinyl ethyl ether base oil in the refrigerator oil is 20 wt%, and the kinematic viscosity at 40 ℃ of the polyvinyl ethyl ether base oil is 75mm²And s. In another embodiment provided by the present invention, the content of the polyvinyl ethyl ether base oil in the refrigerator oil is 35 wt%, and the kinematic viscosity at 40 ℃ of the polyvinyl ethyl ether base oil is 70mm²And s. The source of the polyvinyl ethyl ether base oil is not particularly limited in the invention, and the polyvinyl ethyl ether base oil can be prepared according to a preparation method known in the art, for example, vinyl ethyl ether is initiated to polymerize under the action of an initiator to obtain polyvinyl ethyl ether.

The refrigerator oil provided by the invention also comprises 1-5 wt% of functional additives, wherein the functional additives comprise one or more of an antiwear agent, a metal deactivator, an antirust agent, an antioxidant, an antifoaming agent and an acid trapping agent; preferably including anti-wear agents, metal deactivators, rust inhibitors, antioxidants, anti-foam agents, and acid scavengers. In some embodiments provided herein, the functional additives include antiwear agents, metal deactivators, rust inhibitors, antioxidants, anti-foam agents, and acid scavengers; wherein, the content of the antiwear agent in the refrigerating machine oil is preferably 0.5 wt% to 2.0 wt%, the content of the metal deactivator in the refrigerating machine oil is preferably 0.01 wt% to 0.1 wt%, the content of the antirust agent in the refrigerating machine oil is preferably 0.01 wt% to 0.1 wt%, the content of the antioxidant in the refrigerating machine oil is preferably 0.5 wt% to 2.0 wt%, the content of the antifoaming agent in the refrigerating machine oil is preferably 0.005 wt% to 0.02 wt%, and the content of the acid scavenger in the refrigerating machine oil is preferably 0.5 wt% to 2.0 wt%.

In the invention, the antiwear agent is preferably one or more of a sulfur-containing antiwear agent and a phosphorus-containing antiwear agent; the sulfur-containing antiwear agent is preferably triphenyl thiophosphate and/or aminothioester; the phosphorus-containing antiwear agent is preferably tricresyl phosphate and/or a triarylphosphite. In the present invention, the amount of the antiwear agent in the refrigerator oil is preferably 0.5 wt% to 2.0 wt%, and specifically may be 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, 1.0 wt%, 1.1 wt%, 1.2 wt%, 1.3 wt%, 1.4 wt%, 1.5 wt%, 1.6 wt%, 1.7 wt%, 1.8 wt%, 1.9 wt%, or 2.0 wt%. In one embodiment provided herein, the antiwear agent is tricresyl phosphate; wherein the content of tricresyl phosphate in the refrigerator oil is 1.0 wt%. In another embodiment provided by the present invention, the antiwear agent is triphenyl thiophosphate; wherein, the content of the triphenyl thiophosphate in the refrigerator oil is 1.5 wt%. In another embodiment provided herein, the antiwear agent is an aminothioester; wherein the content of the aminothioester in the refrigerator oil is 1.5 wt%. The source of the anti-abrasion agent of the present invention is not particularly limited, and may be any commercially available product.

In the present invention, the metal deactivator is preferably one or more of benzotriazole derivatives and thiadiazole derivatives. The benzotriazole derivative is preferably methylbenzotriazole and/or a methylbenzotriazole derivative; the methylbenzotriazole derivative is preferably irGAME 39. The thiadiazole derivative is preferably 2-mercaptobenzothiazole. In the present invention, the content of the metal deactivator in the refrigerator oil is preferably 0.01 wt% to 0.1 wt%, and specifically may be 0.01 wt%, 0.02 wt%, 0.03 wt%, 0.04 wt%, 0.05 wt%, 0.06 wt%, 0.07 wt%, 0.08 wt%, 0.09 wt%, or 0.1 wt%. In one embodiment provided herein, the metal deactivator is a methylbenzotriazole derivative; wherein, the content of the methylbenzotriazole derivative in the refrigerator oil is 0.05 wt% -0.1 wt%. In another embodiment provided herein, the metal deactivator is 2-mercaptobenzothiazole; wherein the content of the 2-mercaptobenzothiazole in the refrigerator oil is 0.05 wt%. In the present invention, the source of the metal deactivator is not particularly limited, and may be any commercially available product.

In the invention, the antirust agent is preferably one or more of an organic carboxylic acid type antirust agent, an organic carboxylic acid salt type antirust agent, a sulfonate type antirust agent and a heterocyclic compound type antirust agent. Among them, the organic carboxylic acid-based rust inhibitor is preferably n-oleylsarcosine. The kind of the organic carboxylate type rust inhibitor and the sulfonate type rust inhibitor is not particularly limited, and may be those known in the art. The heterocyclic compound antirust agent is preferably benzotriazole. In the present invention, the content of the rust inhibitor in the refrigerator oil is preferably 0.01 wt% to 0.1 wt%, and specifically may be 0.01 wt%, 0.02 wt%, 0.03 wt%, 0.04 wt%, 0.05 wt%, 0.06 wt%, 0.07 wt%, 0.08 wt%, 0.09 wt%, or 0.1 wt%. In one embodiment provided herein, the rust inhibitor is n-oleylsarcosine; wherein the content of n-oleylsarcosine in the refrigerator oil is 0.05 wt%; in another embodiment provided by the invention, the rust inhibitor is benzotriazole; wherein the content of benzotriazole in the refrigerator oil is 0.05 wt%. In the present invention, the source of the rust inhibitor is not particularly limited, and may be any commercially available one.

In the present invention, the antioxidant is preferably an amine antioxidant and/or a phenol antioxidant. Wherein, the amine antioxidant is preferably dinonyl diphenylamine. The phenolic antioxidant is preferably one or more of di-tert-butyl-p-cresol and sulfurized aminophenol. In the present invention, the content of the antioxidant in the refrigerator oil is preferably 0.5 wt% to 2.0 wt%, and specifically may be 0.5 wt%, 1.0 wt%, 1.5 wt%, or 2.0 wt%. The source of the antioxidant of the present invention is not particularly limited, and may be any commercially available product.

In the invention, the anti-foaming agent is preferably one or more of a silicone anti-foaming agent, a polyether anti-foaming agent and a composite anti-foaming agent. Among these, the silicone-based antifoaming agent is preferably dimethicone. The polyether antifoaming agent is preferably a polyoxypropylene-polyoxyethylene copolymer. The composite antifoaming agent is preferably polyether modified polydimethylsiloxane. In the present invention, the content of the antifoaming agent in the refrigerator oil is preferably 0.005 wt% to 0.02 wt%, and specifically may be 0.005 wt%, 0.01 wt%, 0.015 wt%, or 0.02 wt%. The source of the antifoaming agent of the present invention is not particularly limited, and any commercially available one may be used.

In the present invention, the acid scavenger is preferably a glycidyl ester compound. The glycidyl ester compound is preferably glycidyl versatate. In the present invention, the content of the acid scavenger in the refrigerator oil is preferably 0.5 wt% to 2.0 wt%, and specifically may be 0.5 wt%, 1.0 wt%, 1.5 wt%, or 2.0 wt%. In the present invention, the source of the acid scavenger is not particularly limited, and may be any commercially available product.

The refrigerating machine oil provided by the invention has good intermiscibility with an R32 refrigerant in a high-low temperature range, and simultaneously meets the requirements that the critical intersolubility temperature in the low temperature range is not higher than-20 ℃ and the critical intersolubility temperature in the high temperature range is not lower than 40 ℃; in addition, the lubricating grease also has good chemical stability and corrosion resistance, and meets various indexes of the refrigerator oil.

The invention also provides a preparation method of the refrigerator oil, which comprises the following steps:

The types, the use amounts, the sources and the like of the polyvinyl methyl ether base oil, the polyvinyl ethyl ether base oil and the functional additives are consistent with the technical scheme, and are not described in detail herein.

In the step a), the polyvinyl methyl ether base oil and the polyvinyl ethyl ether base oil are preferably mixed at 115-125 ℃. In the present invention, it is preferable that the method further comprises vacuum dehydrating the mixture of the polyvinylmethylether base oil and the polyvinylethylether base oil to form the mixed base oil. The prepared polyvinyl methyl ether base oil and polyvinyl ethyl ether base oil contain trace moisture, and the moisture is removed by mixing, heating and vacuumizing so as to ensure the lower water content of the refrigerator oil and be beneficial to the actual use of the refrigerator oil. In the invention, the vacuum degree of the vacuumizing is preferably 3.0-3.5 KPa.

In the step b), the mixing temperature of the mixed base oil and the functional additive is preferably 70-90 ℃. The mixing mode is not particularly limited, and all the components can be uniformly mixed, for example, all the components can be uniformly mixed by stirring, and the stirring time is preferably 2-3 hours. After the mixing, filtering is preferably carried out, impurities and the like brought in by a container or the outside in the mixing process are filtered, and then the refrigerating machine oil for the refrigeration compressor is obtained and can be packaged for later use.

The preparation method provided by the invention is simple and easy to operate, does not need complex equipment, strict operation process and operation conditions, and can conveniently regulate and control the performance of the refrigerator oil by simply changing the proportion of the polyvinyl methyl ether and the vinyl ethyl ether within a specified dosage range, so that the production process is simple and convenient to regulate and control, and is suitable for large-scale production and application in the market.

For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.

Example 1

49 wt% of a polyvinylmethylether base oil (kinematic viscosity at 40 ℃ C. of 75 mm)²S) and 47.34% by weight of a polyvinyl ethyl ether base oil (kinematic viscosity at 40 ℃ C. of 60 mm)²/s), heating to 120 ℃, vacuumizing to 3.5KPa, and removing water to obtain mixed base oil; cooling the mixed base oil to 80 ℃, and adding 1.0 wt% of phosphorusThe anti-wear agent is tricresyl sulfate, 0.1 wt% of IRGAME 39 deactivator, 0.05 wt% of n-oleyl sarcosine antirust agent, 1.5 wt% of di-tert-butyl-p-cresol antioxidant, 0.01 wt% of dimethicone antifoaming agent and 1.0 wt% of tertiary carbonic acid glycidyl ester acid trapping agent, and the components are stirred for 2.5h, mixed uniformly and filtered to obtain the refrigerator oil (recorded as S1).

Example 2

75.93 wt% of polyvinyl methyl ether base oil (kinematic viscosity at 40 ℃ C. of 60 mm)²S) and 20% by weight of a polyvinyl ethyl ether base oil (kinematic viscosity at 40 ℃ C. of 75 mm)²/s), heating to 115 ℃, vacuumizing to 3.0KPa, and removing water to obtain mixed base oil; after the mixed base oil is cooled to 75 ℃, 1.5 wt% of triphenyl thiophosphate antiwear agent, 0.05 wt% of 2-mercaptobenzothiazole deactivator, 0.05 wt% of benzotriazole antirust agent, 1.0 wt% of sulfurized aminophenol antioxidant, 0.02 wt% of polyoxypropylene-polyoxyethylene copolymer (Pluronic F127) antifoaming agent and 1.5 wt% of tertiary carbonic acid glycidyl ester acid catcher are added, stirred for 3 hours and uniformly mixed, and filtered to obtain the refrigerator oil (recorded as S2).

Example 3

61.39 wt% of a polyvinylmethylether base oil (kinematic viscosity at 40 ℃ C. of 70 mm)²S) and 35% by weight of a polyvinyl ethyl ether base oil (kinematic viscosity at 40 ℃ C. of 70 mm)²/s), heating to 125 ℃, and vacuumizing to 3.5KPa to remove water to obtain mixed base oil; after the mixed base oil is cooled to 85 ℃, 1.5 wt% of aminothio ester antiwear agent, 0.05 wt% of IRGAET 39 deactivator, 0.05 wt% of benzotriazole antirust agent, 1.0 wt% of dinonyldiphenylamine antioxidant, 0.01 wt% of dimethicone antifoaming agent and 1.0 wt% of tertiary carbonic acid glycidyl ester acid trapping agent are added, stirred for 2 hours and uniformly mixed, and filtered to obtain the refrigerating machine oil (recorded as S3).

Comparative example 1

96.34 wt% of a polyvinyl ethyl ether base oil (kinematic viscosity at 40 ℃ C. of 60 mm)²/s) heating to 120 ℃, vacuumizing to 3.5KPa to remove water, cooling to 80 ℃, adding 1.0 wt% of tricresyl phosphate antiwear agent, 0.1 wt% of IRGAME 39 deactivator and 0.05 wt% of n-oleyl sarcosine antirust agentThe mixture was stirred for 2.5 hours for uniform mixing with 1.5 wt% of di-tert-butyl-p-cresol antioxidant, 0.01 wt% of dimethicone antifoaming agent, and 1.0 wt% of versatic acid glycidyl ester trapping agent, and filtered to obtain refrigerator oil (labeled as D1).

Comparative example 2

30 wt% of a polyvinylmethylether base oil (kinematic viscosity at 40 ℃ C. of 75 mm)²S) and 66.34% by weight of a polyvinyl ethyl ether base oil (kinematic viscosity at 40 ℃ C. of 60 mm)²/s), heating to 120 ℃, vacuumizing to 3.5KPa, and removing water to obtain mixed base oil; after cooling the mixed base oil to 80 ℃, adding 1.0 wt% of tricresyl phosphate antiwear agent, 0.1 wt% of IRGAET 39 deactivator, 0.05 wt% of n-oleyl sarcosine antirust agent, 1.5 wt% of di-tert-butyl-p-cresol antioxidant, 0.01 wt% of dimethyl silicone oil antifoaming agent and 1.0 wt% of tert-carbonic acid glycidyl ester acid trapping agent, stirring for 2.5h, uniformly mixing, and filtering to obtain the refrigerator oil (recorded as D2).

Example 4

Performance tests were conducted on the refrigerator oils prepared in examples 1 to 3 and comparative examples 1 to 2, and the results are shown in Table 1.

TABLE 1 refrigerator oils prepared in the examples of the present invention and comparative examples

According to the test results, the refrigerating machine oil provided by the embodiment of the invention and the R32 refrigerant have good compatibility in a high-low temperature range, and can meet the requirements that the critical mutual solubility temperature in the low temperature range is not higher than-20 ℃ and the critical mutual solubility temperature in the high temperature range is not lower than 40 ℃; meanwhile, the lubricating grease has good chemical stability, corrosion resistance and the like, and meets various indexes of the refrigerating machine oil.

The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The refrigerator oil is characterized by comprising the following components:

55-79 wt% of polyvinyl methyl ether base oil;

20-48 wt% of polyvinyl ether base oil;

1 wt% -5 wt% of functional additive;

the functional additive comprises one or more of an antiwear agent, a metal deactivator, an antirust agent, an antioxidant, an antifoaming agent and an acid trapping agent;

the kinematic viscosity of the base oil of the polyvinyl methyl ether at 40 ℃ is 60-75 mm²/s；

The kinematic viscosity of the polyvinyl ether base oil at 40 ℃ is 60-75 mm²/s；

The content of each component in the functional additive in the refrigerator oil is as follows:

2. the refrigerator oil of claim 1 wherein the antiwear agent is selected from one or more of a sulfur-containing antiwear agent and a phosphorus-containing antiwear agent;

3. The refrigerator oil according to claim 1, wherein the rust inhibitor is one or more selected from the group consisting of an organic carboxylic acid-based rust inhibitor, an organic carboxylate-based rust inhibitor, a sulfonate-based rust inhibitor, and a heterocyclic compound-based rust inhibitor;

4. The refrigerator oil of claim 1 wherein the anti-foaming agent is selected from one or more of silicone anti-foaming agents, polyether anti-foaming agents and composite anti-foaming agents.

5. The refrigerator oil of claim 1 wherein the acid scavenger is a glycidyl ester compound.

6. The refrigerator oil of any of claims 1-5 wherein the functional additives comprise antiwear agents, metal deactivators, rust inhibitors, antioxidants, anti-foam agents, and acid scavengers.

7. A method for preparing the refrigerator oil according to any one of claims 1 to 6, comprising: