Hydraulic oil composition

Abstract

The invention discloses a hydraulic oil composition. The hydraulic oil composition comprises the following raw materials in percentage by mass: 20-40% of an anti-wear agent, 20-40% of an antioxidant, 10-20% of ionic liquid, 5-10% of a clearing agent, 5-10% of a dispersing agent, 3-5% of an extreme pressure agent, 3-5% of an anti-rust agent, 2-5% of a light stabilizer and the balance of diluent oil. The hydraulic oil composition disclosed by the invention not only has excellent wear resistance, oxidation resistance, low greasy filth property and the like, but also can be suitable for ultrahigh-pressure equipment hydraulic systems such as giant die forging hydraulic presses, shield tunneling machines, deep sea oil and gas development equipment and the like through a Boscerk RFT APU CL ultrahigh-pressure plunger pump.

Description

Technical Field

[0001] The invention relates to a hydraulic oil composition. Background Art

[0002] As the most widely used industrial lubricant, hydraulic oil has many categories, and the performance requirements for hydraulic oil have different emphases. CN115992025 provides a hydraulic oil combination with excellent antioxidant properties. After compounding with ester base oil and anti-wear agent, rust inhibitor, metal deactivator, antioxidant, viscosity index improver, etc., it can meet the specifications of L-HV and L-HS hydraulic oil in GB11118.1-2011 hydraulic oil, and is particularly suitable for the use of hydraulic equipment that operates at high temperatures for a long time. CN115637186 ​​provides a high-temperature and wear-resistant hydraulic oil, which has excellent high-temperature and wear resistance, can extend the service life of hydraulic oil, and is not easy to deteriorate. CN103087807 provides a high-clearance hydraulic oil composition, which not only has the performance of traditional hydraulic oil, but also keeps the hydraulic oil system clean. CN 116240064 provides a hydraulic oil with high annealing cleanliness and its preparation method and application, which has the characteristics of ash-free, annealing-free, excellent extreme pressure and wear resistance, and is suitable for the hydraulic system of rolling equipment. However, there are few reports on hydraulic oil suitable for ultra-high pressure systems.

[0003] With the development of hydraulic technology, ultra-high pressure has shown great performance advantages in many heavy equipment. With the increase of system pressure, the main engine structure is greatly simplified, the weight is greatly reduced, the unit weight output ratio is improved, the energy consumption in manufacturing is reduced, and the industrial emission pollution is reduced. With the growth of demand for important industrial equipment such as giant die forging hydraulic presses, shield machines, and deep-sea oil and gas development equipment, hydraulic technology is shifting towards ultra-high pressure and large flow. RDE90245 certification is a high-pressure hydraulic oil certification system developed by Bosch Rexroth, a world-renowned hydraulic pump manufacturer. It uses the harsh RFT-APU-CL hydraulic pump bench. The maximum pressure of the bench is 50MPa, the speed is 4000rpm, and the circulating oil temperature exceeds 80℃. It is currently the world's highest pressure and most demanding hydraulic oil bench, which is used to comprehensively evaluate the wear resistance and oxidation life of hydraulic oil. However, there are few hydraulic oil technologies in China that can pass the ultra-high pressure bench test, and it is difficult for commercially available hydraulic oil to effectively protect the hydraulic pump and motor. There is no report on related existing technologies. Summary of the invention

[0004] In order to at least partially solve the above-mentioned technical problems existing in the prior art, an embodiment of the present invention provides a hydraulic oil composition having excellent comprehensive performance and capable of passing the Bosch Rexroth RFT APU CL ultra-high pressure plunger pump bench test, so as to be suitable for the hydraulic system of ultra-high pressure equipment.

[0005] As one aspect of the present invention, it relates to a hydraulic oil composition, which comprises the following constituent raw materials by mass percentage: 20-40% anti-wear agent, 20-40% antioxidant, 10-20% ionic liquid, 5-10% detergent, 5-10% dispersant, 3-5% extreme pressure agent, 3-5% rust inhibitor and 2-5% light stabilizer, and the balance is diluent oil;

[0006] Wherein, the ionic liquid is as shown in formula (I):

[0007]

[0008] In formula (I), the value range of n is 12≤n≤18, and n is an integer.

[0009] By adopting the above technical scheme, the ionic liquid of the present invention is further preferably a diimidazole cation and a diphosphate anion. The use of the ionic liquid to prepare a lubricating oil additive can improve the passivation metal activity and rust prevention performance of the lubricating oil additive, and improve the protection ability of the lubricating oil to metals; it has excellent solubility, and the C12-18 alkyl chain increases the solubility, has excellent compatibility, and ensures that it is dissolved in oil products under high and low temperature performance.

[0010] In one or some possible embodiments, the antioxidant includes a phenolic antioxidant and an auxiliary antioxidant.

[0011] By adopting the above technical scheme, an antioxidant compounded with a phenolic antioxidant and an auxiliary antioxidant is used, which not only has excellent antioxidant properties, but can also effectively complex metal ions and has a metal passivation effect, thereby greatly reducing the generation of sludge. In addition, the volatility of the antioxidant is low, which can further reduce the volatilization of the antioxidant at high temperatures.

[0012] In one or some possible embodiments, the mass ratio of the phenolic antioxidant to the auxiliary antioxidant is (2-3):1.

[0013] In one or some possible embodiments, the phenolic antioxidant is as shown in formula (II):

[0014]

[0015] In formula (II), the value range of n is 12≤n≤18, and n is an integer;

[0016] The auxiliary antioxidant is a mixture of pentaerythritol bis diphosphite and pentaerythritol tetrakis (3-laurylthiopropionate) in any ratio, and the pentaerythritol bis diphosphite is as shown in formula (III):

[0017]

[0018] By adopting the above technical scheme, pentaerythritol bis(diphosphite) and pentaerythritol tetra(3-laurylthiopropionate) are selected as auxiliary antioxidants. Compared with traditional thioester antioxidants, their comprehensive performance is better. When used in combination with hindered phenol main antioxidants and detergents, the thermal stability of hydraulic oil can be significantly improved.

[0019] In one or some possible embodiments, the mass ratio of the pentaerythritol bis(diphosphite) to the pentaerythritol tetrakis(3-laurylthiopropionate) is 1:1.

[0020] In one or some possible embodiments, the anti-wear agent may be any commercially available material, and triphenyl thiophosphate T309 is preferred in the present invention.

[0021] In one or some possible embodiments, the detergent may be any commercially available material. The preferred detergent in the present invention is calcium salicylate T109B having a base value of 280 to 300.

[0022] By adopting the above technical scheme, the preferred detergent of the present invention can better dissolve and disperse the sludge, and at the same time reduce the particle size of the coated sludge, so that the sludge is reasonably distributed, the large particles are removed after passing through the filter, and the small particles are suspended in the oil and will not be deposited on the valve, and the final oil product has good permeability; in addition, calcium salicylate T109B with a base value of 280 to 300 has excellent detergency, high temperature stability, strong neutralization ability, and has excellent compounding performance with the calcium salt of aromatic sulfonic acid.

[0023] In one or some possible embodiments, the dispersant may be any commercially available material. To further enhance the effect of hydraulic oil in dispersing sludge, the present invention preferably uses polyisobutylene succinimide, as shown in formula (IV):

[0024]

[0025] In one or some possible embodiments, the extreme pressure agent may be any commercially available material, and sulfurized olefin cottonseed oil T405 is preferred in the present invention.

[0026] By adopting the above technical solution, the preferred extreme pressure agent of the present invention can form a strong oil film on the metal surface, so that the hydraulic oil product has extreme pressure anti-wear and lower friction coefficient.

[0027] In one or some possible embodiments, the rust inhibitor may be any commercially available material, and the present invention preferably uses a calcium salt of an aromatic sulfonic acid.

[0028] By adopting the above technical solution, the preferred rust inhibitor of the present invention can form an adsorptive protective film on the metal surface, thereby inhibiting the contact between water and oxygen and preventing the metal from rusting.

[0029] In one or some possible embodiments, the light stabilizer can be any commercially available material, and dimethyl sebacate is preferred in the present invention.

[0030] By adopting the above technical solution, the preferred light stabilizer of the present invention effectively improves the thermal stability and weather resistance and reduces the discoloration tendency of the hydraulic oil.

[0031] In one or some possible embodiments, the diluent oil may be any commercially available material, and PCL150SN is preferred in the present invention.

[0032] The beneficial effects of the above technical solution provided by the embodiment of the present application include at least:

[0033] The hydraulic oil composition of the present invention is suitable for anti-wear hydraulic oil of ultra-high pressure plunger pumps, and has excellent properties such as anti-wear, anti-oxidation, and low sludge.

[0034] The hydraulic oil composition of the present invention has passed the test of the Bosch Rexroth RFT APU CL ultra-high pressure plunger pump and can be applied to the hydraulic systems of ultra-high pressure equipment such as giant die forging hydraulic presses, shield machines, and deep-sea oil and gas development equipment.

[0035] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practicing the present invention. DETAILED DESCRIPTION

[0036] The exemplary embodiments of the present disclosure will be described in more detail below. The following are exemplary embodiments of the present disclosure, but it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0037] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0038] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which the invention belongs. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0039] In the description of the present invention, it should be noted that the terms "include", "including", "have", "contain" and the like are open terms, meaning including but not limited to.

[0040] The present invention is further described below in conjunction with specific examples, and the protection scope of the present invention is not limited by the following examples. The sources of materials mainly involved in the examples are all conventional commercial products.

[0041] Example 1

[0042] The components and mass percentages of the hydraulic oil composition of this embodiment are shown in Table 1 below:

[0043] Table 1 Constituent materials and mass percentages of hydraulic oil composition of Example 1

[0044]

[0045]

[0046] Example 2

[0047] The components and mass percentages of the hydraulic oil composition of this embodiment are shown in Table 2 below:

[0048] Table 2 Constituent materials and mass percentages of hydraulic oil composition of Example 2

[0049]

[0050] Example 3

[0051] The components and mass percentages of the hydraulic oil composition of this embodiment are shown in Table 3 below:

[0052] Table 3 Constituent materials and mass percentages of hydraulic oil composition of Example 3

[0053]

[0054] The inventors took Examples 1, 2 and 3 as examples, and conducted key performance tests such as oxidation resistance and thermal stability after blending with Class II hydrogenated base oils PCL150N and 500N. The results are shown in Table 4 below:

[0055] Table 4 Key performance test data

[0056]

[0057]

[0058] It can be seen from the key performance test data results in Table 4 that the hydraulic oil composition prepared by the present invention has excellent anti-wear, anti-oxidation, storage stability, hydrolysis stability, anti-foaming, etc. The total sediment weight of thermal stability is less than 10 mg, and the anti-wear property can pass the Bosch Rexroth RFT APU CL ultra-high pressure plunger pump bench test.

[0059] Taking the hydraulic oil composition prepared in Example 1 as an example, the test data of the Bosch Rexroth RFT APU CL ultra-high pressure plunger pump bench test are recorded in Table 5 below.

[0060] Table 5 Wear of RFT APU CL ultra-high pressure plunger pump bench

[0061]

[0062]

[0063] It can be seen from the wear data in Table 5 that the wear of the 9 plungers of the test bench is extremely low. Therefore, it can be considered that the hydraulic oil composition of the present invention can be applied to the hydraulic system of ultra-high pressure equipment such as giant die forging hydraulic presses, shield machines, and deep-sea oil and gas development equipment.

[0064] Although the description of the present invention has been quite detailed and has been described in particular with respect to several described embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, so as to effectively cover the intended scope of the present invention. In addition, the present invention is described above with the embodiments foreseeable by the inventors, and its purpose is to provide a useful description, and those non-substantial changes to the present invention that are not currently foreseen may still represent equivalent changes of the present invention.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0066] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A hydraulic oil composition, characterized in that: The composition comprises the following raw materials by mass percentage: 20-40% anti-wear agent, 20-40% antioxidant, 10-20% ionic liquid, 5-10% detergent, 5-10% dispersant, 3-5% extreme pressure agent, 3-5% rust inhibitor and 2-5% light stabilizer, and the balance is diluent oil; Wherein, the ionic liquid is as shown in formula (I): In formula (I), the value range of n is 12≤n≤18, and n is an integer.

2. The hydraulic oil composition according to claim 1, characterized in that: The antioxidants include phenolic antioxidants and auxiliary antioxidants.

3. The hydraulic oil composition according to claim 2, characterized in that: The mass ratio of the phenolic antioxidant to the auxiliary antioxidant is (2-3):

1.

4. The hydraulic oil composition according to claim 3, characterized in that: The phenolic antioxidant is shown in formula (II): In formula (II), the value range of n is 12≤n≤18, and n is an integer; The auxiliary antioxidant is a mixture of pentaerythritol bis diphosphite and pentaerythritol tetrakis (3-laurylthiopropionate) in any ratio, and the pentaerythritol bis diphosphite is as shown in formula (III):

5. The hydraulic oil composition according to claim 4, characterized in that: The mass ratio of the pentaerythritol bis(diphosphite) to the pentaerythritol tetrakis(3-laurylthiopropionate) is 1:

1.

6. The hydraulic oil composition according to claim 1, characterized in that: The anti-wear agent is triphenyl thiophosphate T309.

7. The hydraulic oil composition according to claim 1, characterized in that: The detergent is selected from calcium salicylate T109B with a base value of 280-300.

8. The hydraulic oil composition according to claim 1, characterized in that: The dispersant is polyisobutylene succinimide, as shown in formula (IV):

9. The hydraulic oil composition according to claim 1, characterized in that: The rust inhibitor is a calcium salt of an aromatic sulfonic acid.

10. The hydraulic oil composition according to claim 1, characterized in that: The light stabilizer is dimethyl sebacate.

11. The hydraulic oil composition according to claim 1, characterized in that: The diluent oil is PCL150SN.

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