Special oil composition for ultra-low temperature of railway retarder and preparation method of special oil composition

Abstract

The invention discloses a railway retarder ultralow temperature special oil composition and a preparation method thereof, the railway retarder ultralow temperature special oil composition comprises the following components by mass: 11-20 parts of a viscosity index improver; 0.03 to 0.1 part of a metal deactivator; 0.03 to 0.1 part of an antirust agent; 0.2 to 1.0 part of an antioxidant; 0.01 to 0.1 part of an anti-wear agent; 0.2 to 1.0 part of pour point depressant; 0.01 to 0.05 part of an anti-foaming agent; and 77.65 to 88.52 parts of base oil. The special ultralow-temperature oil composition for the railway retarder has excellent oxidation resistance, wear resistance and rust resistance, particularly has an ultrahigh viscosity index (greater than 340) and excellent low-temperature flowing property, can ensure smooth operation of the retarder under an extremely low-temperature condition (-40 DEG C), can meet the requirements of extremely harsh working conditions, and has a good application prospect. And the oil product can meet all requirements of OEM quality indexes.

Description

Technical Field

[0001] The invention relates to a special ultra-low temperature oil composition for railway retarder and a preparation method thereof. Background Art

[0002] The retarder is used in the release stage of the hump speed regulation system. It is located at both ends of the rails and does not require external energy or external control. It can achieve the deceleration effect according to the movement generated by the release speed itself. The retarder is usually placed on both sides of the rails in the release stage of the hump speed regulation system. Its external environment temperature range is -40℃~40℃. The minimum starting temperature can reach -40℃ during winter operation. The oil is required to have excellent viscosity-temperature performance and low temperature performance. During operation, multiple train carriages are pressed over the retarder in turn. Its maximum load can reach 40 tons, which requires high anti-wear performance of the oil. For railway retarders operating in low temperature environments, No. 10 aviation hydraulic oil is currently commonly used as low-temperature railway retarder oil, but its low-temperature performance is insufficient and its wear resistance is poor, which will cause problems such as unstable operation of the retarder and high equipment failure rate. Summary of the invention

[0003] The present invention is made in order to improve the low temperature performance and anti-wear performance of oil products so as to meet the requirements of low operating temperature and high working pressure of railway retarder.

[0004] As a first aspect of the present invention, it relates to a special ultra-low temperature oil composition for a railway retarder, which comprises the following components by mass: 11-20 parts of a viscosity index improver; 0.03-0.1 parts of a metal passivator; 0.03-0.1 parts of a rust inhibitor; 0.2-1.0 parts of an antioxidant; 0.01-0.1 parts of an antiwear agent; 0.2-1.0 parts of a pour point depressant; 0.01-0.05 parts of an antifoaming agent; and 77.65-88.52 parts of a base oil.

[0005] In one or some optional embodiments, the viscosity index improver is an olefin copolymer and its derivatives.

[0006] In one or some preferred embodiments, the viscosity index improver is polymethacrylate.

[0007] In one or some optional embodiments, the molecular weight of the polymethacrylate is about 150,000, and the carbon number of the side chain is 10-16.

[0008] In one or some optional embodiments, the metal deactivator is a benzotriazole derivative having the following structure:

[0009]

[0010] Among them, R is a benzene ring and R' is a butane group.

[0011] In one or some optional embodiments, the kinematic viscosity of the benzotriazole derivative is 80 mm 2 / s, nitrogen content is 14.6%.

[0012] In one or some optional embodiments, the rust inhibitor is dodecenylsuccinic acid.

[0013] In one or some optional embodiments, the antioxidant is 2,6-di-tert-butyl-p-cresol.

[0014] In one or some optional embodiments, the anti-wear agent is tricresyl phosphate.

[0015] In one or some optional embodiments, the phosphorus content of the tricresyl phosphate is 11.7%, the wear spot diameter is 0.45 mm, and the Pb value is 540N.

[0016] In one or some optional embodiments, the pour point depressant is polymethyl methacrylate.

[0017] In one or some optional embodiments, the molecular weight of the polymethyl methacrylate is about 80,000, and the pour point enhancement effect is not less than 10°C.

[0018] In one or some optional embodiments, the anti-foaming agent is methyl silicone oil or phosphate ester.

[0019] In one or some preferred embodiments, the anti-foaming agent is methyl silicone oil.

[0020] In one or some optional embodiments, the base oil is low viscosity hydrorefined industrial white oil.

[0021] In one or some preferred embodiments, the base oil is W1-100 industrial white oil.

[0022] In one or some optional embodiments, the W1-100 industrial white oil has a kinematic viscosity of 1 to 2.5 mm at 40°C. 2 / s; open flash point 100~120℃.

[0023] As a second aspect of the present invention, it relates to a method for preparing the above-mentioned railway retarder ultra-low temperature special oil composition, the method comprising:

[0024] Mix the viscosity index improver, metal passivator, rust inhibitor, antioxidant, anti-wear agent, pour point depressant, anti-foaming agent and base oil evenly.

[0025] The ultra-low temperature special oil composition for railway retarder of the present invention has excellent antioxidant, wear resistance and rust resistance by regulating the oil components and the content of each component, and especially has an ultra-high viscosity index (greater than 340) and excellent low-temperature flowability, which can ensure that the retarder can run smoothly under extremely low temperature conditions (-40° C.), can meet the requirements of extremely harsh working conditions, and the oil product can pass all requirements of OEM quality indicators.

[0026] The present invention uses polymethyl methacrylate (PMA) as a viscosity index improver. Because its structure is an oil-soluble chain polymer compound, at high temperatures, the polymer compound molecules stretch, so that its fluid dynamics volume increases, which in turn leads to an increase in the internal friction of the liquid, that is, an increase in viscosity; at low temperatures, the polymer compound molecules shrink and curl, so that its fluid dynamics volume decreases, which in turn leads to a decrease in internal friction, that is, a decrease in oil viscosity. In addition, the present invention uses a viscosity index improver with a molecular weight of 20,000 to 30,000, and its mass percentage in the composition is 11-20%. This dosage can ensure that the oil product has a kinematic viscosity of ≤600mm at -40. 2 / s.

[0027] The metal passivator used in the present invention is an organic compound composed of non-metallic elements such as P, S, and N. It can inhibit the catalytic effect of metals or their ions on oxidation through film-forming and chelating effects, thereby improving the antioxidant effect of oil products.

[0028] The present invention adopts sulfonate compounds as rust inhibitors, which have excellent rust prevention performance. During the use of lubricating oil, they wet the metal surface and form a metal protective film. Even in the presence of moisture, they can still form a firm oil film on the metal surface to protect the metal from rust and corrosion.

[0029] The present invention adopts 2,6-di-tert-butyl-p-cresol (BHT) as an antioxidant, which can react with free radicals to become inactive substances, thereby terminating the oxidation reaction and further improving the antioxidant property of the oil.

[0030] The present invention adopts an anti-wear agent with a tricresyl phosphate structure, which has good wear resistance and low corrosiveness. When the metal surface is under load, the anti-wear agent reacts with the metal surface to generate a metal protective film with low shear strength, thereby preventing metal wear.

[0031] The present invention uses polymethyl methacrylate (PMA) as a pour point depressant, and its polymerization degree affects the pour point depressant effect. The average carbon number of the side chain has a decisive significance for the pour point depressant effect, because the crystallization temperature of the solid wax in the base oil is required to be consistent with the crystallization temperature of the side chain alkyl, but the solid wax structure of the base oil is complex and the crystallization temperature is relatively wide, so a pour point depressant structure with different side chain lengths and crystallization temperatures is required. The present invention uses a pour point depressant with a side chain carbon number of 10-16, and its mass percentage in the composition is 0.2-1.0%. This dosage reduces the pour point of the oil product by at least -12°C, and the pour point of the oil product is lower than -60°C.

[0032] The antifoaming agent used in the present invention is a methyl silicone oil type composite antifoaming agent, which has good defoaming performance and air release performance, and ensures the antifoaming continuity during use.

[0033] The present invention adopts W1-100 industrial white oil as the base oil, and the base oil can provide better low-temperature viscosity. DETAILED DESCRIPTION

[0034] The following is a detailed description of the embodiments of the present invention: The embodiments of the present invention are implemented on the premise of the technical solution of the present invention, and detailed implementation methods and processes are given, but the protection scope of the present invention is not limited to the following embodiments. The process parameters for which specific conditions are not specified in the following embodiments are generally based on conventional conditions.

[0035] The endpoints and any values ​​of the ranges disclosed in the present invention 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 regarded as specifically disclosed in the present invention.

[0036] Example 1

[0037] W1-100 industrial white oil, polymethacrylate viscosity index improver 7-310, tricresyl phosphate antiwear agent T306, benzotriazole derivative metal passivator IR39, dodecenylsuccinic acid rust inhibitor T746 (total acid value is 267 mgKOH / g, pH value is 4.9), 2,6-di-tert-butyl-p-cresol antioxidant T501, polymethyl methacrylate pour point depressant 1-156 and methyl silicone oil antifoaming agent 1# composite antifoaming agent were mixed, stirred at 60±5°C for 1 to 2 hours, and a special ultra-low temperature oil composition for railway speed reducer was obtained. The addition amount of each component is shown in Table 1.

[0038] Table 1 Components and contents of the special ultra-low temperature oil composition for railway retarder in Example 1

[0039]

[0040]

[0041] The performance of the ultra-low temperature special oil composition for railway retarder prepared in this embodiment was tested, and the test results are shown in Table 2.

[0042] Table 2 Performance data of the ultra-low temperature special oil composition for railway retarder in Example 1

[0043]

[0044] As shown in Table 2, the kinematic viscosity of the railway retarder ultra-low temperature special oil composition prepared in Example 1 at -40°C is only 385.2 mm 2 / s, and the viscosity index is as high as 326, indicating that the railway retarder ultra-low temperature special oil composition has excellent low-temperature fluidity and ultra-high viscosity index, which can effectively ensure the smooth operation of the retarder equipment in a low-temperature environment. Other railway retarder special oils on the market have a kinematic viscosity of more than 600mm at -40℃. 2 / s, which is much larger than this product.

[0045] Example 2

[0046] W1-100 industrial white oil, polymethacrylate viscosity index improver 7-310, tricresyl phosphate antiwear agent T306, benzotriazole derivative metal passivator IR39, dodecenylsuccinic acid rust inhibitor T746 (total acid value is 267 mgKOH / g, pH value is 4.9), 2,6-di-tert-butyl-p-cresol antioxidant T501, polymethyl methacrylate pour point depressant 1-156 and methyl silicone oil antifoaming agent 1# composite antifoaming agent were mixed, stirred at 60±5°C for 1 to 2 hours, and a special ultra-low temperature oil composition for railway speed reducer was obtained. The addition amount of each component is shown in Table 3.

[0047] Table 3 Components and contents of the ultra-low temperature special oil composition for railway retarder in Example 2

[0048] name factory Mass parts / parts W1-100 industrial white oil Karamay Petrochemical 82.81 Viscosity Index Improver 7-310 Evonik 16 Antiwear agent T306 Tianjin Lihai 0.05 Metal passivator IR39 BASF 0.06 Rust inhibitor T746 King Group 0.05 Antioxidant T501 Jinzhou Kangtai 0.5 Pour Point Depressant 1-156 Evonik 0.5 1# Composite antifoaming agent Shanghai Shenpu 0.03

[0049] The performance of the railway retarder ultra-low temperature special oil composition prepared in this embodiment was tested, and the test results are shown in Table 4.

[0050] Table 4 Performance data of the special ultra-low temperature oil composition for railway retarder in Example 2

[0051]

[0052] As shown in Table 4, the kinematic viscosity of the railway retarder ultra-low temperature special oil composition prepared in Example 2 at -40°C is only 394.2 mm2 / s, viscosity index up to 353, excellent low temperature fluidity.

[0053] Example 3

[0054] W1-100 industrial white oil, polymethacrylate viscosity index improver 7-310, tricresyl phosphate antiwear agent T306, benzotriazole derivative metal passivator IR39, dodecenylsuccinic acid rust inhibitor T746 (total acid value is 267 mgKOH / g, pH value is 4.9), 2,6-di-tert-butyl-p-cresol antioxidant T501, polymethyl methacrylate pour point depressant 1-156 and methyl silicone oil antifoaming agent 1# composite antifoaming agent were mixed, stirred at 60±5°C for 1 to 2 hours, and a special ultra-low temperature oil composition for railway speed reducer was obtained. The addition amount of each component is shown in Table 5.

[0055] Table 5 Components and contents of the ultra-low temperature special oil composition for railway retarder in Example 3

[0056] name factory Mass parts / parts W1-100 industrial white oil Karamay Petrochemical 77.65 Viscosity Index Improver 7-310 Evonik 20 Antiwear agent T306 Tianjin Lihai 0.1 Metal passivator IR39 BASF 0.1 Rust inhibitor T746 King Group 0.1 Antioxidant T501 Jinzhou Kangtai 1.0 Pour Point Depressant 1-156 Evonik 1.0 1# Composite antifoaming agent Shanghai Shenpu 0.05

[0057] The performance of the railway retarder ultra-low temperature special oil composition prepared in this embodiment was tested, and the test results are shown in Table 6.

[0058] Table 6 Performance data of the ultra-low temperature special oil composition for railway retarder in Example 3

[0059]

[0060]

[0061] As shown in Table 6, the kinematic viscosity of the railway retarder ultra-low temperature special oil composition prepared in Example 3 at -40°C is only 421.4 mm 2 / s, and the viscosity index is as high as 393, which can effectively ensure the viscosity stability of the oil.

[0062] By analyzing the performance data of the ultra-low temperature special oil composition for railway retarder in Examples 1-3, it can be seen that the ultra-low temperature special oil composition for railway retarder has excellent antioxidant, wear resistance, and rust resistance, especially has excellent low-temperature fluidity and ultra-high viscosity index, and the oil product can pass all requirements of OEM quality indicators.

[0063] Although the specific embodiments of the present invention have been described in detail, it will be understood by those skilled in the art. According to all the teachings disclosed, various modifications and replacements can be made to those details, and these changes are all within the protection scope of the present invention. The full scope of the present invention is given by the attached claims and any equivalents thereof.

Claims

1. A special ultra-low temperature oil composition for railway retarder, characterized in that: The composition comprises the following components by mass: 11-20 parts of viscosity index improver; Metal passivator 0.03-0.1 part; Rust inhibitor 0.03-0.1 part; Antioxidant 0.2-1.0 part; Antiwear agent 0.01-0.1 part; Pour point depressant 0.2-1.0 part; Antifoaming agent 0.01-0.05 parts; Base oil 77.65-88.52 parts.

2. The composition according to claim 1, characterized in that The viscosity index improver is an olefin copolymer and its derivatives.

3. The composition according to claim 2, characterized in that The viscosity index improver is polymethacrylate.

4. The composition according to claim 3, characterized in that The molecular weight of the polymethacrylate is about 150,000, and the carbon number of the side chain is 10-16.

5. The composition according to claim 1, characterized in that The metal deactivator is a benzotriazole derivative.

6. The composition according to claim 5, characterized in that The kinematic viscosity of the benzotriazole derivative is 80 mm 2 / s, nitrogen content is 14.6%.

7. The composition according to claim 1, characterized in that The rust inhibitor is dodecenylsuccinic acid.

8. The composition according to claim 1, characterized in that The antioxidant is 2,6-di-tert-butyl-p-cresol.

9. The composition according to claim 1, characterized in that The anti-wear agent is tricresyl phosphate.

10. The composition according to claim 9, characterized in that The phosphorus content of the tricresyl phosphate is 11.7%, the wear spot diameter is 0.45 mm, and the Pb value is 540N.

11. The composition according to claim 1, characterized in that The pour point depressant is polymethyl methacrylate.

12. The composition according to claim 11, characterized in that The molecular weight of the polymethyl methacrylate is about 80,000, and the pour point enhancement effect is not less than 10°C.

13. The composition according to claim 1, characterized in that The anti-foaming agent is methyl silicone oil or phosphate ester.

14. The composition according to claim 13, characterized in that The anti-foaming agent is methyl silicone oil.

15. The composition according to claim 1, characterized in that The base oil is low-viscosity hydrogenated refined industrial white oil.

16. The composition according to claim 15, characterized in that The base oil is W1-100 industrial white oil.

17. The composition according to claim 16, characterized in that The W1-100 industrial white oil has a kinematic viscosity of 1 to 2.5 mm at 40°C. 2 / s; open flash point 100~120℃.

18. A method for preparing the ultra-low temperature special oil composition for railway retarder according to any one of claims 1 to 16, characterized in that: The method comprises: Mix the viscosity index improver, metal passivator, rust inhibitor, antioxidant, anti-wear agent, pour point depressant, anti-foaming agent and base oil evenly.

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