Refrigerating machine oil and application thereof

Abstract

The invention relates to the technical field of refrigerating machine oil, in particular to refrigerating machine oil and application thereof. The refrigerating machine oil comprises base oil, the base oil comprises C15 alkylbenzene, and based on the total weight of the base oil, the content of the C15 alkylbenzene in the base oil is not less than 80 wt%. The content of C15 alkylbenzene in the base oil of the refrigerating machine oil is not less than 80wt%, so that the refrigerating machine oil has the advantages of low pour point, low viscosity and high Falex extreme pressure load.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration oil, and in particular to refrigeration oil and application thereof. Background Art

[0002] Environmental protection has become an important issue faced by all walks of life. For the home appliance industry that uses this compression refrigeration system, achieving energy conservation and emission reduction is an important means of protecting the environment.

[0003] CN1183236C discloses a lubricant for a compression refrigerator using hydrocarbon refrigerants, a lubricant for a compression refrigerator using hydrocarbon refrigerants with a mineral oil having the following characteristics as a main component: a kinematic viscosity of 5-150 mm at 40°C; 2 / s, pour point below -25°C, viscosity index above 50, %C measured by ndM ring analysis P and %C A A lubricant for compression refrigerators using low-grade hydrocarbon refrigerants, which is mainly composed of mineral oil with an iodine value of more than 50 and less than 12, a nitrogen content of less than 20 ppm, a sulfur content of 0.02-0.3%, and an iodine value of less than 10 gI2 / 100 g. This lubricant is mainly cycloalkyl, has a high pour point, and is also relatively high in viscosity.

[0004] CN104087388A discloses a refrigeration oil composition, which is composed of a base oil with a weight ratio of 96.5-99.5% and a lubricating oil additive with a weight ratio of 0.5-3.5%. The base oil contains 20-79% of alkylated aromatics obtained by alkylation of saturated alkanes and benzene and 21-80% of an alkane mixture, based on the total weight of the composition as 100%. The lubricating oil additive includes: no more than 3% of an extreme pressure anti-wear agent, 0-3% of an antioxidant, 0-3% of a lubricant, 0-0.8% of a metal deactivator, and 0-0.02% of an anti-foaming agent. The kinematic viscosity of the composition at 40°C is 3.0-5.5 mm 2 / s, the pour point is below -45°C, which is not low enough. Summary of the invention

[0005] Compressor manufacturers generally require refrigeration oil to have a pour point as low as possible so that it can be used at lower temperatures. In order to improve COP, they hope that the refrigeration oil has a lower viscosity while ensuring lubricity. Compared with mineral oils of the same viscosity, alkylbenzenes have better pour points, flash points and solubility, but the viscosity of commercially available industrial alkylbenzenes is not low enough, and it is not easy to obtain a kinematic viscosity of 3.2 mm at 40°C. 2 / s or less base oil. The 15-carbon aromatic hydrocarbons obtained by the alkylation reaction of olefins and alkylbenzenes, i.e., synthetic base oils, have lower viscosity and pour point. The lubricity of refrigeration oils can usually be enhanced by adding extreme pressure agents, but the base oil needs to have a high solubility, otherwise the additives will easily precipitate at low temperatures and a cloud point will appear; in addition, highly active extreme pressure agents may cause corrosion to the compressor or even "copper plating", especially sulfur-based and chlorine-based extreme pressure agents, which need to be selected with caution.

[0006] The purpose of the present invention is to overcome the problems of high pour point and insufficient viscosity of refrigeration oil in the prior art, and to provide a refrigeration oil and its application, wherein the refrigeration oil has the characteristics of low pour point and low viscosity.

[0007] In order to achieve the above object, the present invention provides a refrigeration oil on the one hand, which contains a base oil, and the base oil contains C15 alkylbenzene, wherein the content of C15 alkylbenzene in the base oil is not less than 80wt% based on the total weight of the base oil.

[0008] A second aspect of the present invention provides a use of the refrigeration oil described in the first aspect in a refrigeration system using isobutane as a refrigerant.

[0009] Through the above technical solution, the present invention has the following advantages:

[0010] The content of C15 alkylbenzene in the base oil of the refrigerator oil of the present invention is not less than 80wt%, so that the refrigerator oil has the advantages of low pour point, low viscosity and high Falex extreme pressure load.

[0011] The refrigeration oil of the present invention is particularly suitable for a refrigeration system using isobutane as a refrigerant, and can improve the COP value of the refrigeration system when used in the refrigeration system using isobutane as a refrigerant. DETAILED DESCRIPTION

[0012] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0013] The present invention provides a refrigeration oil, which comprises a base oil, wherein the base oil comprises C15 alkylbenzene, wherein the content of C15 alkylbenzene in the base oil is not less than 80wt% based on the total weight of the base oil.

[0014] The content of C15 alkylbenzene in the base oil of the refrigerator oil of the present invention is not less than 80wt%, so that the refrigerator oil has the advantages of low pour point, low viscosity and high Falex extreme pressure load.

[0015] According to a particularly preferred embodiment of the present invention, based on the total weight of the base oil, the content of C15 alkylbenzene in the base oil is, for example, 82wt%, 85wt%, 88wt%, 90wt%, 93wt%, 95wt%, 98wt% and 100wt% and the point value or range formed between any two points, preferably not less than 90wt%, more preferably 95-100wt%. By adopting the aforementioned preferred manner, the pour point and viscosity of the refrigerator oil can be further reduced, and the Falex extreme pressure load value of the refrigerator oil can be increased during use.

[0016] In the present invention, the base oil contains, in addition to the aforementioned C15 alkylbenzene, other substances commonly used as base oils in the industry, such as commercially available solvent oil and / or commercially available dodecylbenzene.

[0017] In the present invention, as long as the purpose of the present invention can be achieved, there is no special requirement for the content of the base oil. According to a particularly preferred embodiment of the present invention, based on the total weight of the refrigeration oil, the content of the base oil is 96.5-99.5wt%, such as 96.8wt%, 97wt%, 97.5wt%, 98wt%, 98.5wt%, 99wt% and 99.2wt%, preferably 96.5-99wt%. By adopting the aforementioned preferred method, the pour point and viscosity of the refrigeration oil can be further reduced, and the Falex extreme pressure load value of the refrigeration oil can be increased during use.

[0018] In the present invention, there is no special requirement for the preparation method of C15 alkylbenzene in the base oil, and it can be a conventional method in the art. The following exemplary description is given, but the scope of the present invention is not limited thereby. According to a particularly preferred embodiment of the present invention, the preparation method of C15 alkylbenzene comprises: under the condition of an alkylation catalyst, olefin is contacted with benzene and / or alkylbenzene for reaction, and the reaction product is purified to obtain C15 alkylbenzene.

[0019] In the present invention, the alkylation catalyst is a conventional choice in the art, and the following exemplary description is given, but the scope of the present invention is not limited thereby. According to a particularly preferred embodiment of the present invention, the alkylation catalyst is selected from aluminum trichloride and / or ferric trichloride, preferably aluminum trichloride.

[0020] According to a particularly preferred embodiment of the present invention, the olefin is a C2-C8 olefin, preferably a C6-C8 straight olefin. By adopting the above preferred manner, the pour point and viscosity of the refrigeration oil can be further reduced, and the Falex extreme pressure load value of the refrigeration oil can be increased during use.

[0021] According to a particularly preferred embodiment of the present invention, the alkylbenzene is a C7-C13 alkylbenzene, preferably a C7-C9 alkylbenzene. By adopting the above preferred manner, the pour point and viscosity of the refrigeration oil can be further reduced, and the Falex extreme pressure load value of the refrigeration oil can be increased during use.

[0022] In the present invention, as long as the purpose of the present invention can be achieved, there is no special requirement for the conditions of the contact reaction. The following is an exemplary description, but it does not limit the scope of the present invention. According to a particularly preferred embodiment of the present invention, the contact conditions include: temperature of 60-100°C and time of 1-5h.

[0023] In the present invention, the optional range of the molar ratio of the olefin to the alkylbenzene is relatively wide, which is exemplified below, but does not limit the scope of the present invention. According to a particularly preferred embodiment of the present invention, the molar ratio of the olefin to the alkylbenzene is 1:4-8.

[0024] In the present invention, the purification includes removing the catalyst, removing the unreacted olefins and alkylbenzenes, and removing the solids in sequence. The purification method is not particularly limited in the present invention. The following exemplary description does not limit the scope of the present invention. According to a preferred embodiment of the present invention, the method of removing the catalyst includes alkali washing the reaction product to remove the catalyst; the method of removing the unreacted olefins and alkylbenzenes includes removing the unreacted olefins and alkylbenzenes from the reaction product after removing the catalyst by flash evaporation; the method of removing the solids includes filtration, for example, filtration using white clay activated carbon.

[0025] According to a particularly preferred embodiment of the present invention, the C15 alkylbenzene contains at least one methyl group on its benzene ring, preferably 1 methyl group. By adopting the above preferred embodiment, the pour point and viscosity of the refrigeration oil can be further reduced, and the Falex extreme pressure load value of the refrigeration oil can be increased during use.

[0026] According to a preferred embodiment of the present invention, the C15 alkylbenzene is a C7-C9 alkylbenzene substituted with a C6-C8 straight-chain or branched alkyl group, and the substitution position is any other unsubstituted position on the benzene ring; preferably, the C15 alkylbenzene is a C7-C9 alkylbenzene substituted with a C6-C8 straight-chain alkyl group; the C15 alkylbenzene is toluene substituted with a C8 straight-chain or branched alkyl group, and the substitution position is any other unsubstituted position on the benzene ring; preferably, the C15 alkylbenzene is toluene substituted with a C8 straight-chain alkyl group.

[0027] In the present invention, in the C15 alkylbenzene, the one or more alkyl groups substituted at any position on the benzene ring preferably have 2-3 substituents, and more preferably the carbon number of the alkyl group is not more than 8.

[0028] In the present invention, in order to further reduce the pour point and viscosity of the refrigeration oil and increase the Falex extreme pressure load value of the refrigeration oil, according to a particularly preferred embodiment of the present invention, the kinematic viscosity of the C15 alkylbenzene at 40°C is 2.6-3.2 mm 2 / s, for example, the viscosity is 2.65mm 2 / s, 2.7mm 2 / s, 2.75mm 2 / s, 2.8mm 2 / s, 2.85mm 2 / s, 2.9mm 2 / s, 2.95mm 2 / s、3mm 2 / s、3.5mm 2 / s、3.1mm 2 / s and 3.15mm 2 / s, preferably 2.6-3mm 2 / s.

[0029] In the present invention, in order to further reduce the pour point and viscosity of the refrigeration oil and increase the Falex extreme pressure load value of the refrigeration oil, according to a particularly preferred embodiment of the present invention, the pour point of the C15 alkylbenzene is ≤-50°C, preferably ≤-60°C.

[0030] In the present invention, in order to further reduce the pour point and viscosity of the refrigeration oil and increase the Falex extreme pressure load value of the refrigeration oil, according to a particularly preferred embodiment of the present invention, the open flash point of the C15 alkylbenzene is ≥100°C, preferably ≥110°C, and more preferably 115-120°C.

[0031] According to a particularly preferred embodiment of the present invention, the refrigeration oil further comprises an additive, and preferably the additive comprises at least one of an antioxidant, an anti-corrosion agent and a defoaming agent, and an extreme pressure agent.

[0032] In the present invention, there is no special requirement for the content of the additive. The following exemplary description is not intended to limit the scope of the present invention. According to a particularly preferred embodiment of the present invention, based on the total weight of the refrigeration oil, the content of the additive is 0.5-3.5wt%, for example, 0.8wt%, 1.2wt%, 1.5wt%, 1.8wt%, 2wt%, 2.5wt% and 3wt%, preferably 1-3.5wt%.

[0033] In the present invention, in order to improve the lubricity of refrigeration oil, according to a particularly preferred embodiment of the present invention, the extreme pressure agent is a non-sulfur and non-chlorine extreme pressure agent, preferably a neutral phosphate extreme pressure agent, and more preferably one or more of tert-butylated triphenyl phosphate, tritolyl phosphate, triphenyl phosphate, octyl diphenyl phosphate, and benzyl diphenyl phosphate.

[0034] In the present invention, as long as the purpose of the present invention can be achieved, the antioxidant can be a conventional choice in the art. The following exemplary description is given, but the scope of the present invention is not limited thereto. According to a preferred embodiment of the present invention, the antioxidant is a phenolic antioxidant, preferably 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, and β-naphthol.

[0035] In the present invention, as long as the purpose of the present invention can be achieved, the corrosion inhibitor is a conventional choice in the art. The following exemplary description is given, but the scope of the present invention is not limited thereto. According to a particularly preferred embodiment of the present invention, the corrosion inhibitor is a benzotriazole derivative and / or a thiadiazole derivative corrosion inhibitor, preferably one or more of N,N-dialkylaminomethylenebenzotriazole, 2,5-dimercapto-1,3,4-thiadiazole derivatives, dimercapto-benzothiadiazole, and dimercaptothiadiazole sodium.

[0036] In the present invention, as long as the purpose of the present invention can be achieved, the defoaming agent can be a conventional choice in the art. The following exemplary description is given, but the scope of the present invention is not limited thereto. According to a particularly preferred embodiment of the present invention, the defoaming agent is selected from polysiloxane polymers and / or acrylate polymers, the polysiloxane polymer can be dimethyl silicone oil, and the acrylate polymer can be a homopolymer of acrylate and / or a copolymer of acrylate.

[0037] In the present invention, as long as the purpose of the present invention can be achieved, there is no special requirement for the content of the extreme pressure agent in the additive. The following is an exemplary description, but the scope of the present invention is not limited thereto. According to a particularly preferred embodiment of the present invention, based on the total weight of the refrigeration oil, the content of the extreme pressure agent in the additive is 0.4-3.4wt%, preferably 1.5-2.5wt%.

[0038] In the present invention, as long as the purpose of the present invention can be achieved, there is no special requirement for the content of the antioxidant in the additive. The following is an exemplary description, but the scope of the present invention is not limited thereto. According to a particularly preferred embodiment of the present invention, based on the total weight of the refrigeration oil, the content of the antioxidant in the additive is 0-0.5wt%, preferably 0.1-0.3wt%.

[0039] In the present invention, as long as the purpose of the present invention can be achieved, there is no special requirement for the content of the anti-corrosion agent in the additive. The following is an exemplary description, but it does not limit the scope of the present invention. According to a particularly preferred embodiment of the present invention, based on the total weight of the refrigeration oil, the content of the anti-corrosion agent in the additive is 0-0.05wt%, preferably 0.01-0.03wt%.

[0040] In the present invention, as long as the purpose of the present invention can be achieved, there is no special requirement for the content of the antifoaming agent in the additive. The following is an exemplary description, but the scope of the present invention is not limited thereto. According to a particularly preferred embodiment of the present invention, based on the total weight of the refrigeration oil, the content of the antifoaming agent in the additive is 0-0.005wt%, preferably 0.0003-0.001wt%.

[0041] According to a particularly preferred embodiment of the present invention, the kinematic viscosity of the refrigeration oil at 40°C is 2.6-3.2 mm 2 / s, for example, the kinematic viscosity is 2.7mm 2 / s, 2.8mm 2 / s, 2.9mm 2 / s、3.0mm 2 / s, 3.10mm 2 / s, preferably 2.6-3.0mm 2 / s.

[0042] According to a particularly preferred embodiment of the present invention, the kinematic viscosity of the refrigeration oil at 100°C is 0.8-1.3 mm 2 / s, preferably 0.9-1.2mm 2 / s.

[0043] According to a particularly preferred embodiment of the present invention, the pour point of the refrigeration oil is ≤-50°C, preferably ≤-60°C.

[0044] According to a particularly preferred embodiment of the present invention, the cloud point of the refrigeration oil is ≤-50°C, preferably ≤-60°C.

[0045] According to a particularly preferred embodiment of the present invention, the open flash point of the refrigeration oil is ≥100°C, preferably ≥110°C.

[0046] According to a particularly preferred embodiment of the present invention, the Falex extreme pressure load of the refrigeration oil is not less than 3500N, preferably 3600-5000N.

[0047] Any refrigeration oil that meets the aforementioned requirements of the present invention can achieve the purpose of the present invention. There is no special requirement for its preparation method. The following exemplary description does not limit the scope of the present invention. The present invention provides a preparation method of the refrigeration oil, which comprises: mixing and heating the base oil and the additive in an inert atmosphere such as a nitrogen atmosphere.

[0048] In the present invention, as long as the purpose of the present invention can be achieved, the heating conditions can be conventional choices in the art. The following exemplary description does not limit the scope of the present invention. According to a preferred embodiment of the present invention, the heating temperature is 40-50°C, and the heating time is adjusted accordingly with the change of the heating temperature, for example, the heating time is 2-4h.

[0049] In the present invention, the moisture content in the refrigeration oil product is less than 25 ppm.

[0050] The invention provides an application of the refrigerator oil in a refrigeration system using isobutane as a refrigerant.

[0051] The refrigeration oil of the present invention is particularly suitable for a refrigeration system using isobutane as a refrigerant, and can improve the COP value of the refrigeration system when used in the refrigeration system using isobutane as a refrigerant.

[0052] The present invention will be described in detail below by way of examples. In the following examples,

[0053] Kinematic viscosity is measured according to GB / T 265-1988;

[0054] Pour point is measured according to GB / T 3535-2006;

[0055] The cloud point is measured according to GB / T 6986-2014;

[0056] Open cup flash point is measured according to GB / T 3536-2008;

[0057] Falex extreme pressure load is measured according to ASTM D3233-19;

[0058] The moisture content in refrigeration oil is measured according to GB / T 11133-2015;

[0059] Unless otherwise specified, all raw materials are commercially available.

[0060] Example 1

[0061] Preparation of C15 alkylbenzene: 1-octene and toluene were put into a reactor in a molar ratio of 1:6, and aluminum chloride catalyst was added. After reacting at 80°C for 3 hours, the catalyst was removed by alkaline washing with 1% NaOH. The organic phase was heated to 135°C and introduced into a flash tank for flash evaporation to remove unreacted raw materials. The C15 alkylbenzene was filtered through white clay activated carbon to obtain a kinematic viscosity of 2.90 mm at 40°C. 2 / s, pour point is <-60℃, open flash point is 116℃.

[0062] Preparation of refrigeration oil: Based on the total weight of the refrigeration oil, select 96.5wt% of C15 alkylbenzene, select 3.25wt% of tricresyl phosphate extreme pressure agent, and select 0.25wt% of 2,6-di-tert-butyl-p-cresol. Mix the above raw materials evenly, heat to 45°C, and introduce nitrogen with a moisture content of less than 0.5ppm for 3 hours.

[0063] Test the moisture content of refrigeration oil. If the moisture content is less than 25ppm, the sample is qualified and sealed. It is applied to high-efficiency compressors of refrigerators using isobutane as refrigerant. The test results are shown in Table 1.

[0064] Example 2

[0065] Preparation of C15 alkylbenzene: 1-heptene and ethylbenzene in a molar ratio of 1:5 are put into a reactor, aluminum chloride catalyst is added, and the reaction is carried out at 90°C for 2 hours, and then the catalyst is removed by alkaline washing with 1% NaOH. The organic phase is heated and introduced into a flash tank for flash evaporation to remove unreacted raw materials, and C15 alkylbenzene is obtained by filtration through white clay activated carbon. The kinematic viscosity at 40°C is 2.80 mm 2 / s, pour point is <-60℃, and open flash point is 115℃.

[0066] Preparation of refrigeration oil: Based on the total weight of refrigeration oil, 94.5wt% of C15 alkylbenzene and 4.5wt% of 40℃ kinematic viscosity of 4.32mm were selected. 2 / s, a pour point of -20 ° C, and a flash point of 131 ° C. The commercially available D130 solvent oil is selected, 0.9wt% of tert-butylated triphenyl phosphate extreme pressure agent is selected, and 0.1wt% of 2,6-di-tert-butyl-p-cresol is selected. The above raw materials are mixed evenly, heated to 45 ° C, and nitrogen with a moisture content of less than 0.5ppm is introduced for 3 hours.

[0067] Test the moisture content of refrigeration oil. If the moisture content is less than 25ppm, the sample is qualified and sealed. It is applied to high-efficiency compressors of refrigerators using isobutane as refrigerant. The test results are shown in Table 1.

[0068] Example 3

[0069] Preparation of C15 alkylbenzene: 1-hexene and propylbenzene were put into a reactor in a molar ratio of 1:4, and aluminum chloride catalyst was added. After reacting at 75°C for 3 hours, the catalyst was removed by alkaline washing with 1% NaOH. The organic phase was heated and introduced into a flash tank for flash evaporation to remove unreacted raw materials. The C15 alkylbenzene was filtered through white clay activated carbon to obtain a kinematic viscosity of 2.82 mm at 40°C. 2 / s, pour point is <-60℃, and open flash point is 118℃.

[0070] Preparation of refrigeration oil: Based on the total weight of refrigeration oil, 96wt% of C15 alkylbenzene and 1.8wt% of 40℃ kinematic viscosity of 4.32mm were selected. 2 / s, a pour point of -20 ° C, and a flash point of 131 ° C. The commercially available D130 solvent oil is selected, 2wt% of tert-butylated triphenyl phosphate extreme pressure agent is selected, and 0.2wt% of 2,6-di-tert-butyl-p-cresol is selected. The above raw materials are mixed evenly, heated to 45 ° C, and nitrogen with a moisture content of less than 0.5ppm is introduced for 3 hours.

[0071] Test the moisture content of refrigeration oil. If the moisture content is less than 25ppm, the sample is qualified and sealed. It is applied to high-efficiency compressors of refrigerators using isobutane as refrigerant. The test results are shown in Table 1.

[0072] Example 4

[0073] The preparation of C15 alkylbenzene is the same as in Example 1.

[0074] Preparation of refrigeration oil: Based on the total weight of refrigeration oil, 81.5wt% of C15 alkylbenzene and 15wt% of 40℃ kinematic viscosity of 4.32mm were selected. 2 / s, a pour point of -20 ° C, and a flash point of 131 ° C. The commercially available D130 solvent oil is selected, 3.25wt% of tricresyl phosphate extreme pressure agent is selected, and 0.25wt% of 2,6-di-tert-butyl-p-cresol is selected. The above raw materials are mixed evenly, heated to 45 ° C, and nitrogen with a moisture content of less than 0.5ppm is introduced for 3 hours.

[0075] Test the moisture content of refrigeration oil. If the moisture content is less than 25ppm, the sample is qualified and sealed. It is applied to high-efficiency compressors of refrigerators using isobutane as refrigerant. The test results are shown in Table 1.

[0076] Example 5

[0077] The preparation of C15 alkylbenzene is the same as in Example 1.

[0078] Preparation of refrigeration oil: Based on the total weight of the refrigeration oil, select 99.5wt% of C15 alkylbenzene, select 0.4wt% of tert-butylated triphenyl phosphate extreme pressure agent, and select 0.1wt% of 2,6-di-tert-butyl-p-cresol. Mix the above raw materials evenly, heat to 45°C, and introduce nitrogen with a moisture content of less than 0.5ppm for 3 hours.

[0079] Test the moisture content of refrigeration oil. If the moisture content is less than 25ppm, the sample is qualified and sealed. It is applied to high-efficiency compressors of refrigerators using isobutane as refrigerant. The test results are shown in Table 1.

[0080] Example 6

[0081] The preparation of C15 alkylbenzene is the same as in Example 1.

[0082] Preparation of refrigeration oil: Based on the total weight of refrigeration oil, 80.5wt% of C15 alkylbenzene and 16wt% of 40℃ kinematic viscosity of 4.35mm 2 / s, pour point of <-60°C, flash point of 141°C, commercially available dodecylbenzene, 3.25wt% of tricresyl phosphate extreme pressure agent, 0.25wt% of 2,6-di-tert-butyl-p-cresol, the above raw materials are mixed evenly, heated to 45°C, and nitrogen with a moisture content of less than 0.5ppm is introduced for 3 hours.

[0083] Test the moisture content of refrigeration oil. If the moisture content is less than 25ppm, the sample is qualified and sealed. It is applied to high-efficiency compressors of refrigerators using isobutane as refrigerant. The test results are shown in Table 1.

[0084] Comparative Example 1

[0085] The kinematic viscosity of the commercially available viscosity grade 3 at 40°C is 3.37 mm 2 / s refrigeration oil (98wt% paraffin-based mineral base oil and 2wt% tert-butylated triphenyl phosphate extreme pressure anti-wear agent) is used in high-efficiency compressors of refrigerators using isobutane as refrigeration. The test results are shown in Table 2.

[0086] Comparative Example 2

[0087] The kinematic viscosity of the viscosity grade 2 sold on the market at 40°C is 2.78 mm 2 / s refrigeration oil (98wt% intermediate base mineral base oil and 2wt% tert-butylated triphenyl phosphate extreme pressure anti-wear agent) is used in a high-efficiency compressor of a refrigerator using isobutane as a refrigeration. The test results are shown in Table 2.

[0088] Comparative Example 3

[0089] The commercially available refrigeration oil product with a viscosity grade of 4 and a kinematic viscosity of 4.25 mm2 / s at 40°C (98 wt% dodecylbenzene base oil and 2 wt% tert-butylated triphenyl phosphate extreme pressure anti-wear agent) is used in high-efficiency compressors for refrigerators using isobutane as a refrigerant. The test results are shown in Table 2.

[0090] Comparative Example 4

[0091] The preparation of C15 alkylbenzene is the same as in Example 1.

[0092] Preparation of refrigeration oil: Based on the total weight of refrigeration oil, 60wt% of C15 alkylbenzene and 36.5wt% of 40℃ kinematic viscosity of 4.35mm 2 / s, pour point of <-60°C, flash point of 141°C, commercially available dodecylbenzene, 3.25wt% of tricresyl phosphate extreme pressure agent, 0.25wt% of 2,6-di-tert-butyl-p-cresol, the above raw materials are mixed evenly, heated to 45°C, and nitrogen with a moisture content of less than 0.5ppm is introduced for 3 hours.

[0093] Test the moisture content of refrigeration oil. If the moisture content is less than 25ppm, the sample is sealed. It is applied to high-efficiency compressors of refrigerators using isobutane as refrigerant. The test results are shown in Table 2.

[0094] Comparative Example 5

[0095] Same as Example 1, except that C15 alkylbenzene is replaced by C14 alkylbenzene. Preparation of C14 alkylbenzene:

[0096] 1-Octene and benzene in a molar ratio of 1:6 were put into a reactor, and aluminum chloride catalyst was added. After reacting at 80°C for 3 hours, the catalyst was removed by alkaline washing with 1% NaOH, and the organic phase was heated to 135°C and introduced into a flash tank for flash evaporation to remove unreacted raw materials. C14 alkylbenzene was obtained by filtration through white clay activated carbon. The kinematic viscosity at 40°C was 2.06 mm2 / s, the pour point was -37°C, and the flash point was 117°C.

[0097] The high-efficiency compressor used in refrigerator refrigeration using isobutane as refrigerant is tested. The results are shown in Table 2.

[0098] Comparative Example 6

[0099] Same as Example 1, except that C15 alkylbenzene is replaced by C17 alkylbenzene. Preparation of C17 alkylbenzene:

[0100] 1-Decene and toluene in a molar ratio of 1:6 were put into a reactor, and aluminum chloride catalyst was added. After reacting at 80°C for 3 hours, the catalyst was removed by alkaline washing with 1% NaOH, and the organic phase was heated to 135°C and introduced into a flash tank for flash evaporation to remove unreacted raw materials. C16 alkylbenzene was obtained by filtration through white clay activated carbon. The kinematic viscosity at 40°C was 3.98 mm2 / s, the pour point was <-60°C, and the flash point was 147°C.

[0101] The high-efficiency compressor used in refrigerator refrigeration using isobutane as refrigerant is tested. The results are shown in Table 2.

[0102] Table 1

[0103]

[0104]

[0105] Table 2

[0106]

[0107] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A refrigeration oil, characterized in that: The refrigerating machine oil comprises a base oil, wherein the base oil comprises a C15 alkylbenzene, wherein Based on the total weight of the base oil, the content of C15 alkylbenzene in the base oil is not less than 80wt%.

2. The refrigerating machine oil according to claim 1, wherein Based on the total weight of the base oil, the content of C15 alkylbenzene in the base oil is not less than 90wt%, preferably 95-100wt%; and / or Based on the total weight of the refrigeration oil, the content of the base oil is 96.5-99.5wt%, preferably 96.5-99wt%; and / or Based on the total weight of the refrigeration oil, the content of the additive is 0.5-3.5wt%, preferably 1-3.5wt%.

3. The refrigerating machine oil according to claim 1 or 2, wherein: The preparation method of C15 alkylbenzene comprises: contacting olefin with benzene and / or alkylbenzene under alkylation catalyst conditions, and purifying the reaction product to obtain C15 alkylbenzene; preferably, The alkylation catalyst is selected from aluminum chloride and / or ferric chloride; and / or The olefin is a C2-C8 olefin, preferably a C6-C8 straight-chain olefin; and / or The alkylbenzene is a C7-C13 alkylbenzene, preferably a C7-C9 alkylbenzene; and / or The contact reaction conditions include: a temperature of 60-100° C., a time of 1-5 hours; and / or a molar ratio of the olefin to the alkylbenzene of 1:4-8.

4. The refrigerating machine oil according to any one of claims 1 to 3, wherein: The C15 alkylbenzene has at least one methyl group on its benzene ring, preferably one methyl group; More preferably, the C15 alkylbenzene is a C7-C9 alkylbenzene substituted with a C6-C8 straight-chain or branched alkyl group, and the substitution position is any other unsubstituted position on the benzene ring; preferably, the C15 alkylbenzene is a C7-C9 alkylbenzene substituted with a C6-C8 straight-chain alkyl group; The C15 alkylbenzene is toluene substituted with a C8 straight-chain or branched alkyl group, and the substitution position is any other unsubstituted position on the benzene ring; preferably, the C15 alkylbenzene is toluene substituted with a C8 straight-chain alkyl group.

5. The refrigeration oil according to any one of claims 1 to 4, wherein: The kinematic viscosity of the C15 alkylbenzene at 40°C is 2.6-3.2 mm 2 / s, preferably 2.6-3mm 2 / s; and / or The pour point of the C15 alkylbenzene is ≤-50°C, preferably ≤-60°C; and / or The C15 alkylbenzene has an open flash point of ≥100°C, preferably ≥110°C, more preferably 115-120°C.

6. The refrigerating machine oil according to any one of claims 1 to 5, wherein: The refrigerating machine oil further comprises an additive, and preferably the additive comprises at least one of an antioxidant, an anti-corrosion agent and a defoaming agent, and an extreme pressure agent.

7. The refrigerating machine oil according to claim 6, wherein: The extreme pressure agent is a non-sulfur and non-chlorine extreme pressure agent, preferably a neutral phosphate extreme pressure agent, more preferably one or more of tert-butylated triphenyl phosphate, tricresyl phosphate, triphenyl phosphate, octyl diphenyl phosphate, and benzyl diphenyl phosphate; and / or The antioxidant is a phenolic antioxidant, preferably 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, and β-naphthol; and / or The corrosion inhibitor is a benzotriazole derivative and / or a thiadiazole derivative corrosion inhibitor, preferably one or more of N,N-dialkylaminomethylenebenzotriazole, 2,5-dimercapto-1,3,4-thiadiazole derivative, dimercapto-benzothiadiazole, and sodium dimercaptothiadiazole; and / or The defoaming agent is selected from polysiloxane polymers and / or polyacrylate polymers.

8. The refrigerating machine oil according to claim 7, wherein: Based on the total weight of the refrigeration oil, The content of the extreme pressure agent is 0.4-3.4wt%, preferably 1.5-2.5wt%; and / or The content of antioxidant is 0-0.5wt%, preferably 0.1-0.3wt%; and / or The content of the anticorrosive agent is 0-0.05wt%, preferably 0.01-0.03wt%; and / or The content of the defoaming agent is 0-0.005wt%, preferably 0.0003-0.001wt%.

9. The refrigeration oil according to any one of claims 1 to 8, wherein: The kinematic viscosity of the refrigeration oil at 40°C is 2.6-3.2 mm 2 / s, preferably 2.6-3mm 2 / s; and / or The kinematic viscosity of the refrigeration oil at 100°C is 0.8-1.3 mm 2 / s, preferably 0.9-1.2mm 2 / s; and / or The pour point of the refrigerator oil is ≤-50°C, preferably ≤-60°C; and / or The cloud point of the refrigerator oil is ≤-50°C, preferably ≤-60°C; and / or The open flash point of the refrigeration oil is ≥100°C, preferably ≥110°C; and / or The Falex extreme pressure load of the refrigeration oil is not less than 3500N, preferably 3600-5000N.

10. Use of the refrigeration oil according to any one of claims 1 to 9 in a refrigeration system using isobutane as a refrigerant.

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