High-speed rail shock absorber oil composition as well as preparation method and application thereof

Abstract

The invention belongs to the field of special oil for high-speed rail damping systems, and particularly relates to a high-speed rail damper oil composition, a preparation method and application. The composition is prepared from 10 to 20 parts of a viscosity index improver, 0.01 to 1 part of a friction improver, 0.01 to 0.2 part of an anti-rust agent, 0.1 to 1.0 part of an antioxidant, 0.01 to 0.2 part of an anti-wear agent, 0.01 to 0.1 part of a demulsifying agent, 0.01 to 0.1 part of an anti-foaming agent and 75 to 90 parts of base oil. The viscosity index improver is polymethacrylate, the molecular weight of the viscosity index improver is 17,000-19,000, and the carbon number of a side chain of the viscosity index improver is 10-20. The high-speed rail shock absorber oil composition disclosed by the invention has excellent low-temperature fluidity, high-temperature stability and anti-rust property, particularly has excellent wear resistance, and can ensure smooth operation under a high-load condition (15MPa).

Description

Technical Field

[0001] This invention belongs to the field of special oils for high-speed rail vibration reduction systems, specifically relating to a high-speed rail vibration damper oil composition, preparation method, and application. Background Technology

[0002] High-speed trains operate at speeds exceeding 300 kilometers per hour. During acceleration and deceleration, the front and rear carriages experience enormous horizontal traction forces. At high speeds, the train body is subjected to strong vertical forces. High-speed train shock absorbers are the main components for mitigating horizontal traction forces and longitudinal bumps in the carriages. During operation, the temperature inside the high-speed train shock absorber can reach around 120°C, and the piston can withstand pressures exceeding 15 MPa. High-speed trains operate across a wide range of latitudes, requiring excellent high and low temperature performance. Therefore, the oils used in these trains have high requirements for anti-wear properties, anti-oxidation properties, low-temperature fluidity, and high-temperature stability.

[0003] Patent CN116024035A discloses a special anti-wear damping oil composition for high-speed rail vehicles, which has good low-temperature fluidity, high-temperature stability, oxidation resistance, wear resistance, rust prevention and cleaning properties.

[0004] Based on the operating characteristics of high-speed rail vibration dampers, the damper oil is required to have excellent viscosity-temperature characteristics, low-temperature performance, foaming characteristics, air release properties, anti-wear and extreme pressure characteristics, oxidation stability, and shear stability. However, there are currently no dedicated high-speed rail vibration damper oil products on the market, so it is urgent to develop a high-performance high-speed rail vibration damper oil. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a high-speed rail vibration damper oil composition that meets the requirements of low operating temperature and high working pressure for high-speed rail vibration dampers.

[0006] To achieve the objectives of this invention, the following technical solution is adopted:

[0007] A high-speed rail vibration damper oil composition, the composition comprising a viscosity index improver, a friction improver, a rust inhibitor, an antioxidant, an anti-wear agent, a demulsifier, an anti-foaming agent, and a base oil; wherein the viscosity index improver is a polymethyl methacrylate with a molecular weight of 170,000-190,000 and a side chain carbon number of 10-20.

[0008] The viscosity index improver is polymethyl methacrylate (PMA), which is an oil-soluble chain polymer compound. At high temperatures, the polymer molecules extend, increasing their hydrodynamic volume and leading to increased internal friction, i.e., increased viscosity. At low temperatures, the polymer molecules contract and curl up, reducing their hydrodynamic volume and internal friction, thus decreasing the viscosity of the oil.

[0009] Based on the characteristics of the base oil used, a viscosity index improver with a molecular weight between 150,000 and 200,000 is preferred. Its mass percentage, based on the total mass of the composition, is 10%-20%, which can ensure that the kinematic viscosity of the oil at -40℃ is ≤500 mmHg. 2 / s.

[0010] Preferably, the viscosity index improver is selected from olefin copolymers or their derivatives.

[0011] Preferably, the viscosity index improver is selected from polymethacrylate 7-510.

[0012] Preferably, the base oil is a low-viscosity hydrorefined light white oil.

[0013] Preferably, the friction modifier is a mixture containing sulfurized olefins, with a kinematic viscosity of 60-75 mm² / s and a sulfur content of 30-45%. The friction modifier reduces the coefficient of friction and improves the friction environment by forming a film on the surface of the friction pair, thereby enhancing the lubrication performance of the oil.

[0014] Preferably, the friction modifier is one or more of T405, T451 and T451A.

[0015] Preferably, the rust inhibitor is selected from at least one of T747, T746, NA-SUL 729, and T702. The rust inhibitor has excellent rust-preventing properties. During the use of lubricating oil, it acts on the metal surface to form a protective film. Even in the presence of moisture, it can still form a strong oil film on the metal surface, protecting the metal from rust and corrosion.

[0016] Preferably, the antioxidant is selected from one or more of L57, L67 and L135.

[0017] Antioxidants have excellent antioxidant properties. Under high temperature conditions, they effectively protect the stability of oil products, turning them into inert substances, thereby terminating oxidation reactions and improving the antioxidant properties of oil products.

[0018] Preferably, the anti-wear agent is one or more of T306, AW-6110 and IR232.

[0019] Anti-wear agents have good anti-wear properties and low corrosiveness. When the metal surface is under load, the anti-wear agent reacts with the metal surface to form a metal protective film with low shear strength, thereby preventing metal wear.

[0020] Preferably, the demulsifier is a surfactant with a molecular weight of 0.5-20,000 and a kinematic viscosity of 10-30 mm. 2 / s, and the demulsibility index is no more than 30min.

[0021] Preferably, the demulsifier is DL32. A demulsifier is a surfactant that can disrupt emulsions. It primarily disrupts the emulsion by partially replacing the stabilizing film. It neutralizes emulsifiers present in the emulsion, breaks down water-in-oil emulsions, and causes the solid phase to aggregate, thereby demulsifying. The demulsifier has a molecular weight of approximately 10,000 and a kinematic viscosity of 20 mmHg. 2 / s, and the demulsibility index is no more than 30min.

[0022] Preferably, the antifoaming agent is selected from one or two of methyl silicone oil and phosphate ester. The antifoaming agent is a methyl silicone oil type 1# composite antifoaming agent with a mass percentage of 0.01%-0.05%. This antifoaming agent has good defoaming performance and air release properties, ensuring the continuity of antifoaming during use.

[0023] Preferably, the antifoaming agent is a methyl silicone oil type 1# composite antifoaming agent.

[0024] Preferably, the base oil is W1-100 industrial white oil with a kinematic viscosity of not less than 2 mm² / s at 40°C and an open flash point of not less than 105°C.

[0025] Preferably, the base oil is Karamay W1-100 industrial white oil and / or Hebei Feitian W1-100 industrial white oil.

[0026] Preferably, by weight, the composition comprises 10-20 parts of viscosity index improver, 0.01-1 parts of friction improver, 0.01-0.2 parts of rust inhibitor, 0.1-1.0 parts of antioxidant, 0.01-0.2 parts of anti-wear agent, 0.01-0.1 parts of demulsifier, 0.01-0.1 parts of antifoaming agent, and 75-90 parts of base oil.

[0027] Furthermore, the components of the high-speed rail shock absorber oil composition may also include at least one of thiadiazole derivative, tricresyl phosphate, and 2,6-di-tert-butylphenol, wherein the weight parts of the thiadiazole derivative, tricresyl phosphate, or 2,6-di-tert-butylphenol are 0.01-1.0 parts, and the mass content is 0.01%-1.0%.

[0028] Another objective of this invention is to provide a method for preparing a high-speed rail shock absorber oil composition, comprising mixing a viscosity index improver, a friction improver, a rust inhibitor, an antioxidant, an anti-wear agent, a demulsifier, an anti-foaming agent, and a base oil, and stirring to obtain the final product.

[0029] Preferably, the stirring temperature is 55-65℃ and the stirring time is 1-3 hours.

[0030] Another object of the present invention is to provide the application of the above-mentioned high-speed rail damper oil composition in the preparation of damper oil products.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] The high-speed rail damper oil composition of the present invention has excellent low-temperature fluidity, high-temperature stability, and rust prevention, and especially excellent anti-wear properties, which can ensure smooth operation under high load conditions (15MPa). Detailed Implementation

[0033] The present invention will be further described below with reference to specific embodiments.

[0034] Example 1

[0035] Add W1-100 industrial white oil, polymethyl methacrylate viscosity index improver, tricresyl phosphate, anti-wear agent, sulfur-containing mixture friction improver, dodecenyl succinic acid compound rust inhibitor, octyl butyl diphenylamine antioxidant, surfactant pour point depressant, and methyl silicone oil antifoaming agent according to the proportions in Table 1. Mix thoroughly at 60±5℃ for 1 hour to complete the blending.

[0036] Table 1. Substances and content of high-speed rail vibration damper oil in Example 1

[0037]

[0038]

[0039] The performance tests of the high-speed rail vibration damper oil composition prepared by blending are shown in Table 2.

[0040] Table 2 Performance data of the high-speed rail vibration damper oil composition in Example 1

[0041]

[0042] The high-speed rail shock absorber oil composition in Example 1 has a kinematic viscosity of only 427.3 mm at -40°C. 2 With a viscosity index as high as 363, the high-speed rail vibration damper oil has excellent low-temperature fluidity and an ultra-high viscosity index, which can effectively ensure the smooth operation of the high-speed rail vibration damper in low-temperature environments.

[0043] Example 2

[0044] The formula is shown in Table 3 below.

[0045] Table 3. Substances and Contents of High-Speed ​​Railway Vibration Damper Oil (Example 2)

[0046] name quality% W1-100 Industrial White Oil 85.3 Viscosity index improver 7-510 13.6 Anti-wear agent AW-6110 0.1 Friction modifier T451 0.4 Rust inhibitor NA-SUL 729 0.1 Antioxidant L135 0.4 Demulsifier DL32 0.05 #1 Composite Antifoaming Agent 0.05

[0047] The performance tests of the high-speed rail vibration damper oil prepared by blending are shown in Table 4.

[0048] Table 4 Performance data of the high-speed rail vibration damper oil composition in Example 2

[0049]

[0050] Example 3

[0051] Table 5. Substances and Contents of High-Speed ​​Railway Vibration Damper Oil in Example 3

[0052] name quality% W1-100 Industrial White Oil 78.49 Viscosity index improver 7-510 19.4 Anti-wear agent IR232 0.17 Friction modifier T451A 0.8 Rust Inhibitor T702 0.18 Antioxidant L67 0.8 Demulsifier DL32 0.08 #1 Composite Antifoaming Agent 0.08

[0053] The performance tests of the high-speed rail vibration damper oil composition prepared by blending are shown in Table 6.

[0054] Table 6 Performance data of the high-speed rail vibration damper oil composition in Example 3

[0055]

[0056]

[0057] Comparative Example 1

[0058] The difference between this comparative example and Example 1 is that the viscosity index improver is different, and the specific formulation is as follows:

[0059] Table 7. Substances and Contents of High-Speed ​​Railway Vibration Damper Oil (Comparative Example 1)

[0060]

[0061] Comparative Example 2

[0062] The difference between this comparative example and Example 1 lies in the antioxidant used; the specific formulation is as follows:

[0063] Table 8. Substances and content of high-speed rail vibration damper oil (Comparative Example 2)

[0064]

[0065] result:

[0066] Table 9 Performance data of the high-speed rail vibration damper oil compositions in Comparative Examples 1-2

[0067]

[0068] As can be seen from the performance data of the high-speed rail damper oil composition in the examples, the high-speed rail damper oil composition of the present invention has excellent anti-oxidation, anti-wear, and anti-rust properties, especially excellent low-temperature fluidity and ultra-high viscosity index, and the oil can meet all the requirements of OEM quality indicators.

Claims

1. A high iron shock absorber oil composition characterized in that, The composition comprises viscosity index improver, friction modifier, rust inhibitor, antioxidant, anti-wear agent, demulsifier, anti-foaming agent and base oil; the viscosity index improver is polymethacrylate, the molecular weight is 170-190 thousand, and the side chain carbon number is 10-20.

2. The high-speed railway damper oil composition according to claim 1, wherein The viscosity index improver is selected from polymethacrylate 7-510.

3. The high-speed railway damper oil composition according to claim 1, wherein The base oil is low-viscosity hydrogenated refined light white oil.

4. The high-speed rail damper oil composition of claim 1, wherein The friction modifier is a sulfurized olefin mixture having a kinematic viscosity of 60-75 mm 2 / s at 100 °C and a sulfur content of 30-45 %.

5. The high-speed rail damper oil composition of claim 1, wherein The friction modifier is one or more of T405, T451 and T451A.

6. The high-speed rail damper oil composition of claim 1, wherein The rust inhibitor is selected from at least one of T747, T746, NA-SUL 729 and T702.

7. The high-speed rail damper oil composition of claim 1, wherein The antioxidant is selected from one or more of L57, L67 and L135.

8. The high-speed rail damper oil composition of claim 1, wherein The anti-wear agent is one or more of T306, AW-6110 and IR232.

9. The high-speed rail damper oil composition of claim 1, wherein The demulsifier is a surfactant with a molecular weight of 0.5-20,000 and a kinematic viscosity of 10-30 mm 2 / s, and an anti-emulsification index of no more than 30 min.

10. The high-speed rail damper oil composition of claim 1, wherein The demulsifier is DL32.

11. The high-speed rail damper oil composition of claim 1, wherein The anti-foaming agent is selected from one or both of methyl silicone oil and phosphate ester.

12. The high-speed rail damper oil composition of claim 1, wherein, The anti-foaming agent is methyl silicone oil type 1# composite anti-foaming agent.

13. The high-speed rail damper oil composition of claim 1, wherein The base oil is W1-100 industrial white oil, 40℃ kinematic viscosity is not less than 2mm 2 / s, opening flash point is not less than 105℃.

14. The high-speed rail damper oil composition of claim 1, wherein The base oil is Karamay W1-100 industrial white oil and / or Hebei Feitian W1-100 industrial white oil.

15. The high-speed rail damper oil composition of claim 1, wherein The composition comprises, by weight fraction, 10-20 parts of viscosity index improver, 0.01-1 part of friction modifier, 0.01-0.2 part of rust inhibitor, 0.1-1.0 part of antioxidant, 0.01-0.2 part of anti-wear agent, 0.01-0.1 part of demulsifier, 0.01-0.1 part of anti-foaming agent, and 75-90 parts of base oil.

16. A process for the preparation of a high-iron damper oil composition according to any one of claims 1 to 15, characterized in that, The composition is obtained by mixing and stirring the viscosity index improver, friction modifier, rust inhibitor, antioxidant, anti-wear agent, demulsifier, anti-foaming agent and base oil.

17. The preparation method according to claim 16, characterized in that, The stirring temperature is 55-65℃, and the stirring time is 1-3h.

18. Use of the high-iron shock absorber oil composition of any one of claims 1-15 in the preparation of a shock absorber oil product.

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