Hydraulic oil and hydraulic system

Abstract

The present invention provides a hydraulic oil and a hydraulic system. The hydraulic oil of the present invention comprises, by mass percentage, 92-96% of phosphate ester; 2-4% of polyether; 1-2% of ionic liquid; 0.5-1% of 2,6-di-tert-butyl-p-methylphenol; 0.5-1% of nonyl diphenylamine; 0.01-0.1% of barium dinonylnaphthalenesulfonate; and 0.05-0.1% of alkylbenzotriazole; wherein the ionic liquid comprises a structure of formula 1. The hydraulic oil of the present invention has relatively excellent lubrication performance, flame retardancy and oxidation stability.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating oil, and in particular to a hydraulic oil and a hydraulic system. Background Art

[0002] In the hydraulic system, pumps and high-power oil motors are the main moving parts. In industrial applications, it is often necessary to add hydraulic oil to the pumps and oil motors to assist the operation of the pumps and oil motors. With the rapid development of hydraulic technology, the requirements for the anti-oxidation stability, flame retardancy and lubricity of hydraulic oil have also been greatly improved. Summary of the invention

[0003] The invention provides a hydraulic oil having excellent anti-oxidation stability, flame retardancy and lubricity.

[0004] The present invention provides a hydraulic system, which includes the above-mentioned hydraulic oil and can not only operate efficiently but also operate safely and have a long service life.

[0005] The present invention provides a hydraulic oil, which comprises, by mass percentage:

[0006]

[0007] Wherein, the ionic liquid comprises the following structure:

[0008]

[0009] Wherein, n is a positive integer selected from 4-9.

[0010] The hydraulic oil as described above, wherein the mass percentage of the polyether is 2-3% based on the total mass of the hydraulic oil.

[0011] The hydraulic oil as described above, wherein the mass ratio of the polyether to the ionic liquid is 2:1.

[0012] The hydraulic oil as described above, wherein, based on the total mass of the hydraulic oil, the mass percentage of the 2,6-di-tert-butyl-p-methylphenol is 0.6-0.8%.

[0013] The hydraulic oil as described above, wherein the mass percentage of the nonyldiphenylamine is 0.6-0.8% based on the total mass of the hydraulic oil.

[0014] The hydraulic oil as described above, wherein the mass percentage of the barium dinonylnaphthalenesulfonate is 0.02-0.08% based on the total mass of the hydraulic oil.

[0015] The hydraulic oil as described above, wherein the mass percentage of the alkylated benzotriazole is 0.06-0.08% based on the total mass of the hydraulic oil.

[0016] The hydraulic oil as described above, wherein the structural formula of the ionic liquid is;

[0017]

[0018] The hydraulic oil as described above, wherein the phosphate ester comprises trixylene phosphate and / or tert-butylphenyl phosphate.

[0019] The present invention provides a hydraulic system, which comprises the hydraulic oil as described above.

[0020] The present invention provides a hydraulic oil, which contains a specific content of phosphate, polyether, ionic liquid, 2,6-di-tert-butyl-p-methylphenol, nonyldiphenylamine, barium dinonylnaphthalenesulfonate and alkylbenzotriazole, and the ionic liquid includes a structure of Formula 1. Since the ionic liquid constituting the hydraulic oil includes the structure of Formula 1, the hydraulic oil has relatively excellent oxidation stability, flame retardancy and lubricity. It is worth mentioning that the ionic liquid does not contain sulfur and phosphorus elements. The use of the ionic liquid can reduce the content of sulfur and phosphorus elements in the hydraulic oil as much as possible, so the environmental protection performance of the hydraulic oil can be improved.

[0021] The hydraulic system of the present invention, because it contains the above-mentioned hydraulic oil, has relatively excellent oxidation stability, flame retardancy and lubrication performance. The hydraulic system can not only operate efficiently, but also operate safely and have a long service life. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The first aspect of the present invention provides a hydraulic oil, comprising, by mass percentage:

[0024]

[0025] Among them, ionic liquids include the following structures:

[0026]

[0027] Wherein, n is a positive integer selected from 4-9.

[0028] The present invention does not limit the specific source of the ionic liquid. The ionic liquid can be prepared by a preparation method commonly used in the art, or it can be purchased commercially.

[0029] The present invention does not particularly limit the phosphate ester, polyether, 2,6-di-tert-butyl-p-methylphenol, nonyldiphenylamine, barium dinonylnaphthalenesulfonate and alkylbenzotriazole, and the phosphate ester, polyether, 2,6-di-tert-butyl-p-methylphenol, nonyldiphenylamine, barium dinonylnaphthalenesulfonate and alkylbenzotriazole commonly used in the art can be selected.

[0030] In the present invention, the hydraulic oil includes the structure of Formula 1. On the one hand, the main component of the hydraulic oil is the ionic liquid shown in Formula 1, so it can show excellent compatibility when combined with other components; on the other hand, the hydraulic oil has excellent oxidation stability, lubrication and flame retardancy. The hydraulic oil can meet the requirements of DL / T 571-2014 specification, can be used in the digital electro-hydraulic control system (EH system) of the steam turbine of the power plant, and can ensure the smooth movement of the equipment during use.

[0031] At the same time, the ionic liquid does not contain sulfur and phosphorus elements. The use of the ionic liquid can reduce the content of sulfur and phosphorus elements in the hydraulic oil as much as possible, so the environmental performance of the hydraulic oil can be improved, which is convenient for industrial application. In addition, the ionic liquid also has excellent anti-rust, anti-corrosion and anti-emulsification properties, so the hydraulic oil containing the ionic liquid also has excellent anti-rust, anti-corrosion and anti-emulsification properties, and has a wide range of industrial applications.

[0032] In some embodiments of the present invention, when the phosphate ester includes trixylene phosphate and / or tert-butylphenyl phosphate, it can be better compatible with other components and better improve the high temperature stability and lubricity of the hydraulic oil.

[0033] When the polyether includes oil-soluble polyether, the viscosity-temperature performance, low-temperature fluidity and high-temperature stability of the hydraulic oil can be better improved.

[0034] The structural formula of ionic liquid is:

[0035] When used in combination with other hydraulic oils, the hydraulic oil has better comprehensive performance (flame retardancy, lubrication and oxidation stability).

[0036] Furthermore, when the mass percentage of the polyether is 2-3% based on the total mass of the hydraulic oil, the hydraulic oil has more excellent flame retardancy, oxidation stability and lubricity.

[0037] In some embodiments of the present invention, the mass ratio of polyether to ionic liquid is 2: 1. When the mass ratio of polyether to ionic liquid is 2: 1, it can not only improve the viscosity of hydraulic oil and the oxidation stability of hydraulic oil, but also make the appearance of hydraulic oil transparent.

[0038] In some embodiments of the present invention, in order to further improve the appearance of the hydraulic oil, the mass percentage of 2,6-di-tert-butyl-p-methylphenol is 0.6-0.8% based on the total mass of the hydraulic oil. Furthermore, the purity of 2,6-di-tert-butyl-p-methylphenol is greater than 99%, and the hydraulic oil still has excellent appearance transparency after being oxidized.

[0039] In some embodiments of the present invention, the mass percentage of nonyldiphenylamine is 0.6-0.8% based on the total mass of the hydraulic oil.

[0040] In the present invention, when the mass percentage of nonyl diphenylamine is within the above range, the oxidation stability of the hydraulic oil can be better improved. Furthermore, the purity of nonyl diphenylamine is greater than 99%, which can not only better improve the oxidation stability of the hydraulic oil, but also the high-purity nonyl diphenylamine is conducive to improving the purity of the hydraulic oil, preventing impurities from affecting the purity of the hydraulic oil, thereby causing the color of the hydraulic oil to deepen.

[0041] In some embodiments of the present invention, in order to further improve the compatibility of the components and improve the oxidation stability, lubricity and flame retardancy of the hydraulic oil, the mass percentage of barium dinonylnaphthalenesulfonate is 0.02-0.08% based on the total mass of the hydraulic oil.

[0042] In some embodiments of the present invention, the mass percentage of alkylated benzotriazole is 0.06-0.08% based on the total mass of the hydraulic oil. The mass percentage of alkylated benzotriazole within the above range can be more conducive to improving the oxidation stability, lubricity and flame retardancy of the hydraulic oil, especially protecting the copper parts in the hydraulic system and extending the service life of the hydraulic system.

[0043] The hydraulic oil in some embodiments of the present invention can be obtained by uniformly mixing the raw materials according to the above composition. The present invention does not specifically limit the order of adding the raw materials, the stirring rate, and the mixing temperature.

[0044] The hydraulic oil of the present invention not only has relatively excellent oxidation stability, flame retardancy and lubricity, but also has simple preparation process, is easy to operate and has a wide range of applications.

[0045] A second aspect of the present invention provides a hydraulic system comprising the hydraulic oil as described above.

[0046] The hydraulic system of the present invention, because it contains the above-mentioned hydraulic oil, has relatively excellent oxidation stability, flame retardancy and lubrication performance. The pump and oil motor in the hydraulic system can not only operate efficiently, but also operate safely and have a long service life.

[0047] The technical solution of the present invention is further described below in conjunction with specific embodiments.

[0048] The ionic liquid in each embodiment is

[0049]

[0050] Wherein, n is a positive integer selected from 4 to 9 and is obtained through commercial purchase;

[0051] The polyether in each embodiment and comparative example is Plurasafe CL 6000, purchased from BASF; the alkylbenzotriazole in each embodiment and comparative example is A51, purchased from Dow Chemical;

[0052] The purity of nonyldiphenylamine in each embodiment and comparative example is 95%;

[0053] The purity of 2,6-di-tert-butyl-p-methylphenol in each of the examples and comparative examples was 99%.

[0054] Example 1

[0055] The composition of the hydraulic oil in this embodiment is shown in Table 1:

[0056] Table 1

[0057] name Mass percentage / % Trixylyl Phosphate 93.44 Polyether 3 Ionic liquid (n=9) 1.5 2,6-Di-tert-butyl-p-methylphenol 1 Nonyldiphenylamine 1 Barium dinonylnaphthalenesulfonate 0.01 Alkyl benzotriazole 0.05

[0058] Example 2

[0059] The composition of the hydraulic oil in this embodiment is shown in Table 2:

[0060] Table 2

[0061] name Mass percentage / % Tert-Butylphenyl Phosphate 95.8 Polyether 2 Ionic liquid (n=4) 1 2,6-Di-tert-butyl-p-methylphenol 0.5 Nonyldiphenylamine 0.5 Barium dinonylnaphthalenesulfonate 0.1 Alkyl benzotriazole 0.1

[0062] Example 3

[0063] The composition of the hydraulic oil in this embodiment is shown in Table 3:

[0064] Table 3

[0065] name Mass percentage / % Trixylyl Phosphate 50 Tert-Butylphenyl Phosphate 42.37 Polyether 4 Ionic liquid (n=7) 2 2,6-Di-tert-butyl-p-methylphenol 0.75 Nonyldiphenylamine 0.75 Barium dinonylnaphthalenesulfonate 0.05 Alkyl benzotriazole 0.08

[0066] Example 4

[0067] The composition of the hydraulic oil of this embodiment is shown in Table 4:

[0068] Table 4

[0069] name Mass percentage / % Trixylyl Phosphate 92.94 Polyether 4 Ionic liquid (n=9) 1 2,6-Di-tert-butyl-p-methylphenol 1 Nonyldiphenylamine 1 Barium dinonylnaphthalenesulfonate 0.01 Alkyl benzotriazole 0.05

[0070] Example 5

[0071] The composition of the hydraulic oil in this embodiment is shown in Table 5:

[0072] Table 5

[0073]

[0074]

[0075] Example 6

[0076] The composition of the hydraulic oil in this embodiment is shown in Table 6:

[0077] Table 6

[0078] name Mass percentage / % Trixylyl Phosphate 93.84 Polyether 3 Ionic liquid (n=9) 1.5 2,6-Di-tert-butyl-p-methylphenol 0.6 Nonyldiphenylamine 1 Barium dinonylnaphthalenesulfonate 0.01 Alkyl benzotriazole 0.05

[0079] Example 7

[0080] The composition of the hydraulic oil of this embodiment is shown in Table 7:

[0081] Table 7

[0082]

[0083]

[0084] Example 8

[0085] The composition of the hydraulic oil of this embodiment is shown in Table 8:

[0086] Table 8

[0087] name Mass percentage / % Trixylyl Phosphate 92.28 Polyether 4 Ionic liquid (n=9) 2 2,6-Di-tert-butyl-p-methylphenol 0.8 Nonyldiphenylamine 0.8 Barium dinonylnaphthalenesulfonate 0.04 Alkyl benzotriazole 0.08

[0088] Comparative Example 1

[0089] The composition of the hydraulic oil of this comparative example is shown in Table 9:

[0090] Table 9

[0091] name Mass percentage / % Trixylyl Phosphate 97.48 Polyether 1 Ionic liquid (n=9) 0.5 2,6-Di-tert-butyl-p-methylphenol 0.5 Nonyldiphenylamine 0.4 Barium dinonylnaphthalenesulfonate 0.04 Alkyl benzotriazole 0.08

[0092] Comparative Example 2

[0093] The composition of the hydraulic oil of this comparative example is shown in Table 10:

[0094] Table 10

[0095] name Mass percentage / % Trixylyl Phosphate 93 Polyether 5 2,6-Di-tert-butyl-p-methylphenol 1 Nonyldiphenylamine 0.94 Barium dinonylnaphthalenesulfonate 0.01 Alkyl benzotriazole 0.05

[0096] Performance Characterization

[0097] The hydraulic oils in the embodiments and comparative examples were subjected to performance tests, and the test results are shown in Table 11.

[0098] Table 11

[0099]

[0100]

[0101] It can be seen from Table 11 that the hydraulic oil prepared in the embodiment of the present invention has relatively excellent oxidation stability, lubricity (density and kinematic viscosity) and flame retardancy (high autoignition point).

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic oil, characterized in that: According to the mass percentage, it includes: Wherein, the ionic liquid comprises the following structure: Wherein, n is a positive integer selected from 4 to 9; The phosphate ester includes trixylyl phosphate and / or tert-butylphenyl phosphate.

2. The hydraulic oil according to claim 1, characterized in that: Based on the total mass of the hydraulic oil, the mass percentage of the polyether is 2-3%.

3. The hydraulic oil according to claim 1 or 2, characterized in that: The mass ratio of the polyether to the ionic liquid is 2:

1.

4. The hydraulic oil according to claim 1 or 2, characterized in that: Based on the total mass of the hydraulic oil, the mass percentage of the 2,6-di-tert-butyl-p-methylphenol is 0.6-0.8%.

5. The hydraulic oil according to claim 3, characterized in that: Based on the total mass of the hydraulic oil, the mass percentage of the 2,6-di-tert-butyl-p-methylphenol is 0.6-0.8%.

6. The hydraulic oil according to any one of claims 1, 2 and 5, characterized in that: Based on the total mass of the hydraulic oil, the mass percentage of the nonyldiphenylamine is 0.6-0.8%.

7. The hydraulic oil according to claim 3, characterized in that: Based on the total mass of the hydraulic oil, the mass percentage of the nonyldiphenylamine is 0.6-0.8%.

8. The hydraulic oil according to claim 4, characterized in that: Based on the total mass of the hydraulic oil, the mass percentage of the nonyldiphenylamine is 0.6-0.8%.

9. The hydraulic oil according to any one of claims 1, 2, 5, 7-8, characterized in that: Based on the total mass of the hydraulic oil, the mass percentage of the barium dinonylnaphthalenesulfonate is 0.02-0.08%.

10. The hydraulic oil according to claim 3, characterized in that: Based on the total mass of the hydraulic oil, the mass percentage of the barium dinonylnaphthalenesulfonate is 0.02-0.08%.

11. The hydraulic oil according to claim 4, characterized in that Based on the total mass of the hydraulic oil, the mass percentage of the barium dinonylnaphthalenesulfonate is 0.02-0.08%.

12. The hydraulic oil according to claim 6, characterized in that Based on the total mass of the hydraulic oil, the mass percentage of the barium dinonylnaphthalenesulfonate is 0.02-0.08%.

13. The hydraulic oil according to any one of claims 1, 2, 5, 7-8, 10-12, characterized in that: Based on the total mass of the hydraulic oil, the mass percentage of the alkylated benzotriazole is 0.06-0.08%.

14. The hydraulic oil according to claim 3, characterized in that Based on the total mass of the hydraulic oil, the mass percentage of the alkylated benzotriazole is 0.06-0.08%.

15. The hydraulic oil according to claim 4, characterized in that Based on the total mass of the hydraulic oil, the mass percentage of the alkylated benzotriazole is 0.06-0.08%.

16. The hydraulic oil according to claim 6, characterized in that Based on the total mass of the hydraulic oil, the mass percentage of the alkylated benzotriazole is 0.06-0.08%.

17. The hydraulic oil according to claim 9, characterized in that Based on the total mass of the hydraulic oil, the mass percentage of the alkylated benzotriazole is 0.06-0.08%.

18. The hydraulic oil according to any one of claims 1, 2, 5, 7-8, 10-12, 14-17, characterized in that: The structural formula of the ionic liquid is:

19. The hydraulic oil according to claim 3, characterized in that: The structural formula of the ionic liquid is:

20. The hydraulic oil according to claim 4, characterized in that The structural formula of the ionic liquid is:

21. The hydraulic oil according to claim 6, characterized in that The structural formula of the ionic liquid is:

22. The hydraulic oil according to claim 9, characterized in that The structural formula of the ionic liquid is:

23. The hydraulic oil according to claim 13, characterized in that The structural formula of the ionic liquid is:

24. A hydraulic system, characterized in that: Comprising the hydraulic oil described in any one of claims 1-23.

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