Lubricating oil as well as preparation method and application thereof

Abstract

The invention relates to the field of lubricating oil, and discloses lubricating oil as well as a preparation method and application thereof. The lubricating oil comprises base oil, a phosphorus-containing additive, an antioxidant, a metal deactivator and an anti-foaming agent, wherein the phosphorus-containing additive is selected from a compound shown in the general formula (I), and R ', R' 'and R ''''in the formula (I) are independently selected from hydrogen, alkyl or aryl.The lubricating oil has excellent high-temperature coking and carbon deposition resistance, so that the lubricating oil can meet the harsh working condition requirement # imgabs0 for the high exhaust temperature of a scroll air compressor.

Description

Technical Field

[0001] The present invention relates to the field of lubricating oil, and in particular to a lubricating oil composition, a preparation method and application thereof. Background Art

[0002] Scroll air compressors are mainly used as power sources for pneumatic tools and pneumatic machinery, and are widely used in the fields of industry, agriculture, transportation, etc. Compared with traditional air compressors, scroll air compressors have the characteristics of low energy consumption, low noise, high reliability and low maintenance costs. They are known as "maintenance-free compressors" and "new revolutionary compressors", have good development prospects, and are ideal models to replace traditional reciprocating micro compressors.

[0003] For high exhaust pressure scroll air compressors (for example, exhaust pressure ≥ 1.6MPa), in order to prevent the precipitation of water vapor in the air from causing the emulsification of the matching lubricating oil, thereby causing the lubricating oil to fail, the strategy of increasing the exhaust temperature of the scroll compressor is generally adopted (the exhaust temperature in some operating conditions can reach about 110°C), thus forming a high temperature and high pressure operating condition. The operating condition of high exhaust temperature puts higher requirements on the high temperature coking resistance of the scroll air compressor lubricating oil at high temperature. At present, the scroll air compressor lubricating oil in use on the market cannot meet the operating conditions of high exhaust temperature, which is mainly manifested in the generation of more coking and carbon deposits inside the scroll compressor, causing the air compressor to fail to work normally.

[0004] Therefore, considering the comprehensive performance, how to reduce the coking and carbon deposition of the scroll air compressor lubricating oil becomes a key issue. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem in the prior art that under high temperature and high pressure conditions, the lubricating oil of the scroll air compressor produces coking and carbon deposition inside the scroll air compressor, causing the air compressor to be unable to work normally. A lubricating oil and a preparation method and application thereof are provided. The lubricating oil has excellent resistance to high temperature coking and carbon deposition, so that the lubricating oil can meet the harsh working conditions of high exhaust temperature of the scroll air compressor.

[0006] In order to achieve the above object, the present invention provides a lubricating oil in a first aspect, the lubricating oil comprising: a base oil, a phosphorus-containing additive, an antioxidant, a metal deactivator and an antifoaming agent;

[0007] Wherein, the phosphorus-containing additive is selected from the compound represented by the general formula (I):

[0008]

[0009] In formula (I), R', R" and R'" are each independently selected from hydrogen, alkyl or aryl.

[0010] A second aspect of the present invention provides a method for preparing a lubricating oil, the method comprising: mixing a base oil, a phosphorus-containing additive, an antioxidant, a metal deactivator and an antifoaming agent.

[0011] The third aspect of the present invention provides use of the lubricating oil described in the first aspect in a scroll air compressor.

[0012] Through the above technical solution, the present invention achieves the following beneficial technical effects:

[0013] The present invention adopts a phosphorus-containing additive compound system with a specific structure. Through the synergistic effect of the phosphorus-containing additive, base oil and antioxidant, the lubricating oil prepared has excellent resistance to high-temperature coking and carbon deposition, so that the lubricating oil can meet the harsh working conditions of high exhaust temperature of the scroll air compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a diagram showing the results of a high temperature coking and carbon deposition experiment on the lubricating oil prepared in Example 1.

[0015] Figure 2 Graph showing the experimental results of high temperature coking and carbon deposition of the lubricating oil prepared in Example 2.

[0016] Figure 3 Graph showing the experimental results of high temperature coking and carbon deposition of the lubricating oil prepared in Comparative Example 1. DETAILED DESCRIPTION

[0017] 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.

[0018] The first aspect of the present invention provides a lubricating oil, which comprises: a base oil, a phosphorus-containing additive, an antioxidant, a metal deactivator and an antifoaming agent;

[0019] Wherein, the phosphorus-containing additive is selected from the compound represented by the general formula (I):

[0020]

[0021] In formula (I), R', R" and R'" are each independently selected from hydrogen, alkyl or aryl.

[0022] According to some embodiments of the present invention, wherein R', R" and R"' in formula (I) are each independently selected from C4-C 20Alkyl and / or C6-C 20 Aryl.

[0023] According to some embodiments of the present invention, the phosphorus-containing additive is selected from at least one of 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-pentadecyl phosphate, tri-hexadecyl phosphate, tri-heptadecyl phosphate, tri-octadecyl phosphate, trioleate phosphate, triphenyl phosphate, tricresyl phosphate, tri-xylene phosphate, toluene diphenyl phosphate and toluene diphenyl phosphate.

[0024] In the present invention, there is no particular limitation on the source of the phosphorus-containing additive, which can be obtained from the market or prepared by itself.

[0025] According to some embodiments of the present invention, based on the total weight of the lubricating oil, the content of the base oil in the lubricating oil is 90wt%-99wt%, the content of the additive is 0.1wt%-3wt%, the content of the antioxidant is 0.5wt%-5wt%, the content of the metal deactivator is 0.001wt%-0.8wt%, and the content of the anti-foaming agent is 0.0001wt%-0.8wt%.

[0026] Preferably, based on the total weight of the lubricating oil, the content of the base oil in the lubricating oil is 91wt%-98wt%, the content of the phosphorus-containing additive is 0.2wt%-2.8wt%, the content of the antioxidant is 0.6wt%-4.8wt%, the content of the metal deactivator is 0.005wt%-0.6wt%, and the content of the antifoaming agent is 0.0005wt%-0.6wt%.

[0027] In the present invention, when the amounts of base oil, phosphorus-containing additives, antioxidants, metal deactivators and anti-foaming agents in the lubricating oil meet the above conditions, the obtained lubricating oil has good resistance to high-temperature coking and carbon deposition, can improve the high-temperature coking resistance of the lubricating oil, and solve the technical problems of coking and carbon deposition of scroll air compressors under high exhaust conditions.

[0028] According to some embodiments of the present invention, the base oil is selected from poly-alpha-olefins and / or synthetic esters.

[0029] Preferably, the kinematic viscosity of the poly-α-olefin at 100°C is 4.0-60 mm 2 / s; the 40 ° C kinematic viscosity of the synthetic ester is 4-250mm 2 / s.

[0030] More preferably, the kinematic viscosity of the poly-α-olefin at 100°C is 4.5-40 mm 2 / s; the kinematic viscosity of the synthetic ester at 40°C is 10-240mm 2 / s.

[0031] In the present invention, the kinematic viscosity of the base oil is used to indicate its flow properties at different temperatures. The kinematic viscosity of the polyalphaolefin and synthetic ester is measured in accordance with GB / T 265-1988 Method for determination of kinematic viscosity of petroleum products and method for calculation of dynamic viscosity.

[0032] In the present invention, there is no particular limitation on the sources of the poly-α-olefin and synthetic ester, and they can be obtained from the market or prepared by themselves.

[0033] According to some embodiments of the present invention, the antioxidant is selected from amine antioxidants and / or phenolic antioxidants.

[0034] Preferably, the amine antioxidant is selected from at least one of phenyl-α-naphthylamine, octylbutyldiphenylamine, diisopropylphenyldiphenylamine, diisooctyldiphenylamine and octylated phenyl-α-naphthylamine.

[0035] Preferably, the phenolic antioxidant is selected from 2,6-di-tert-butyl-p-quinone and / or 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane.

[0036] Preferably, the metal deactivator is selected from phenothiazole derivatives and / or benzotriazole derivatives.

[0037] Preferably, the anti-foaming agent is methyl silicone oil.

[0038] In the present invention, when the lubricating oil meets the above performance parameters, the lubricating oil has good resistance to high temperature coking and carbon deposition, can improve the high temperature coking resistance of the lubricating oil, and solve the technical problems of coking and carbon deposition of the scroll air compressor under high exhaust conditions.

[0039] In the present invention, the lubricating oil provided uses poly-α-olefin and / or synthetic ester as base oil, is matched with phosphorus-containing additives having a specific structure, and then synergistically acts with other antioxidants, metal deactivators and anti-foaming agents, so that the lubricating oil has good high temperature coking resistance.

[0040] A second aspect of the present invention provides a method for preparing a lubricating oil, the method comprising: mixing a base oil, a phosphorus-containing additive, an antioxidant, a metal deactivator and an antifoaming agent.

[0041] In the present invention, there is no particular limitation on the mixing method of the base oil, phosphorus-containing additive, antioxidant, metal deactivator and antifoaming agent, and any conventional mixing method in the art may be used. Preferably, the mixing conditions include: temperature of 90-120° C., pressure of -0.098 to 0.05 MPa, and time of 0.1-3 h.

[0042] Unless otherwise specified, the pressures involved in the present invention are gauge pressures.

[0043] A third aspect of the present invention provides use of the aforementioned lubricating oil in a scroll air compressor.

[0044] In order to further illustrate the present invention, the following examples are provided for detailed description.

[0045] In the following examples of the present invention, unless otherwise specified, all raw materials are commercially available.

[0046] Example 1

[0047] This example is used to illustrate the preparation of a scroll air compressor lubricating oil composition using the method of the present invention. The method comprises: 100 g of base oil (specifically PAO10 and phthalate, the base oil having a kinematic viscosity of 46.0 mm at 40° C.) 2 / s), 2g of phosphorus-containing additive (specifically tricresyl phosphate), 1.25g of antioxidant (specifically N-phenyl-α-naphthylamine, octylbutyl diphenylamine and 2,6-di-tert-butyl-p-quinol), 0.05g of metal deactivator (specifically benzotriazole) and 2.0×10 -3 g antifoaming agent (specifically methyl silicone oil) and stirred evenly, and dehydrated at 110° C. and −0.090 MPa for 1 h to obtain the lubricating oil composition A1.

[0048] Example 2

[0049] This example is used to illustrate the use of the method of the present invention to prepare a scroll air compressor lubricating oil composition, the method comprising: 100g of base oil (specifically trimellitic acid ester, the base oil 40 ° C kinematic viscosity of 80.86mm 2 / s), 2g of phosphorus-containing additive (specifically tricresyl phosphate), 3.0g of antioxidant (specifically diisopropylphenyl diphenylamine), 0.8g of metal deactivator (specifically benzotriazole) and 1.0×10 -3 g anti-foaming agent (specifically methyl silicone oil) was mixed, stirred evenly, and dehydrated at 105° C. and −0.092 MPa for 0.5 h to obtain the lubricating oil composition A2.

[0050] Comparative Example 1

[0051] A lubricating oil composition was prepared according to the method of Example 1, except that the phosphorus-containing additive was replaced with a dihydroxy dithiophosphate derivative, to prepare a lubricating oil composition D1.

[0052] The method comprises: mixing 100 g of base oil (specifically PAO20 and phthalate, the base oil having a kinematic viscosity of 112.4 mm at 40°C) with a 2 / s), 2 g of phosphorus-containing additive (specifically dihydroxy dithiophosphate derivative), 3.0 g of antioxidant (specifically diisopropylphenyl diphenylamine), 0.8 g of metal deactivator (specifically benzotriazole) and 1.0×10 -3 g anti-foaming agent (specifically methyl silicone oil) was mixed, stirred evenly, and dehydrated at 110° C. and −0.092 MPa for 0.5 h to obtain the lubricating oil composition D1.

[0053] Test Case

[0054] The lubricating oils A1-A2 and D1 prepared in Examples 1-2 and Comparative Example 1 were subjected to high temperature coking and carbon deposition experiments. The test results are shown in FIG. Figure 1-Figure 3 .

[0055] The coking and carbon deposition properties were measured using the high-temperature dish coking method. The test temperature was 200°C and the test time was 6 hours.

[0056] Depend on Figure 1-Figure 3 It can be seen that for the lubricating oil prepared by the method of Example 1, no coking and carbon deposits appeared on the metal dish surface after the high-temperature dish coking experiment; for the lubricating oil prepared by the method of Example 2, a small amount of coking and carbon deposits appeared on the metal dish surface after the high-temperature dish coking experiment; for the lubricating oil prepared by the method of Comparative Example 1, serious coking and carbon deposits appeared on the metal dish surface after the high-temperature dish coking experiment.

[0057] In summary, the lubricating oil of the present invention has good resistance to high-temperature coking and carbon deposition, can improve the high-temperature coking resistance of the lubricating oil, and can meet the harsh working conditions of high exhaust temperature of the scroll air compressor.

[0058] 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 lubricating oil, characterized in that: The lubricating oil comprises: base oil, phosphorus-containing additive, antioxidant, metal deactivator and antifoaming agent; Wherein, the phosphorus-containing additive is selected from the compound represented by the general formula (I): In formula (I), R', R" and R'" are each independently selected from hydrogen, alkyl or aryl.

2. The lubricating oil according to claim 1, wherein In the formula (I), R', R" and R"' are each independently selected from C4-C 20 Alkyl or C6-C 20 Aryl.

3. The lubricating oil according to claim 1 or 2, wherein: The phosphorus-containing additive is selected from at least one of 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-pentadecyl phosphate, tri-hexadecyl phosphate, tri-heptadecyl phosphate, tri-octadecyl phosphate, trioleate phosphate, triphenyl phosphate, tricresyl phosphate, tri-xylyl phosphate, cresol diphenyl phosphate and xylyl diphenyl phosphate.

4. The lubricating oil according to any one of claims 1 to 3, wherein: Based on the total weight of the lubricating oil, in the lubricating oil, the content of the base oil is 90wt%-99wt%, the content of the phosphorus-containing additive is 0.1wt%-3wt%, the content of the antioxidant is 0.5wt%-5wt%, the content of the metal deactivator is 0.001wt%-0.8wt%, and the content of the antifoaming agent is 0.0001wt%-0.8wt%.

5. The lubricating oil according to claim 4, wherein: Based on the total weight of the lubricating oil, in the lubricating oil, the content of the base oil is 91wt%-98wt%, the content of the phosphorus-containing additive is 0.2wt%-2.8wt%, the content of the antioxidant is 0.6wt%-4.8wt%, the content of the metal deactivator is 0.005wt%-0.6wt%, and the content of the antifoaming agent is 0.0005wt%-0.6wt%.

6. The lubricating oil according to any one of claims 1 to 5, wherein: The base oil is selected from poly-alpha-olefins and / or synthetic esters; Preferably, the kinematic viscosity of the poly-α-olefin at 100°C is 4-60 mm 2 / s; the 40 ° C kinematic viscosity of the synthetic ester is 4-250mm 2 / s; More preferably, the kinematic viscosity of the poly-α-olefin at 100°C is 4.5-40 mm 2 / s; the kinematic viscosity of the synthetic ester at 40°C is 10-240mm 2 / s.

7. The lubricating oil according to any one of claims 1 to 6, wherein: The antioxidant is selected from amine antioxidants and / or phenolic antioxidants; Preferably, the amine antioxidant is selected from at least one of N-phenyl-α-naphthylamine, octylbutyldiphenylamine, diisopropylphenyldiphenylamine, diisooctyldiphenylamine and octylated phenyl-α-naphthylamine; Preferably, the phenolic antioxidant is selected from 2,6-di-tert-butyl-p-quinol and / or 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane; Preferably, the metal deactivator is selected from phenothiazole derivatives and / or benzotriazole derivatives; Preferably, the anti-foaming agent is methyl silicone oil.

8. A method for preparing lubricating oil, characterized in that: The method comprises: mixing base oil, phosphorus-containing additives, antioxidants, metal deactivators and antifoaming agents.

9. The method according to claim 8, wherein: The mixing conditions include: temperature of 90-120° C., pressure of -0.098 to 0.05 MPa, and time of 0.1-3 h.

10. Use of the lubricating oil according to any one of claims 1 to 7 in a scroll air compressor.

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