A bearing oil composition and its preparation method and application

Abstract

The present invention proposes an anti-wear bearing oil composition and a preparation method and application thereof, wherein the components include: 96.5-97.5wt% of high viscosity index mineral oil, preferably 97.455-96.855wt%, 0.6-1.4wt% of extreme pressure anti-wear agent, 0.5-1.0wt% of pour point depressant, 1.3-1.5wt% of antioxidant, 0.1-0.15wt% of rust inhibitor and 0.001-0.05wt% of anti-foam agent. Suitable base oil and additives compatible with the base oil are selected, and the types and proportions of the additives are explored to obtain the anti-wear bearing oil composition, which has excellent extreme pressure anti-wear performance, good sludge control performance, low temperature performance and oxidation stability, and is suitable for lubrication of traction motors of railway locomotives of railway bureaus.

Description

Technical Field

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

[0002] Bearing oil is mainly used for lubrication of suspension bearings of traction motors of railway locomotives. The traction motors are located at the bottom of the locomotives and are often eroded by wind, rain and snow, which makes them damp. In addition, the daily cleaning of the motors is not timely, which easily causes the accumulation of dust and carbon powder. The harsh mechanical operating environment requires the supporting oil to have excellent low-temperature performance and good anti-rust and anti-corrosion properties. The traction motors work in a harsh environment with severe vibration and impact. They are subject to the impact load caused by the locomotive through the rail joints and turnouts and the high-frequency impact vibration caused by the poor meshing of the traction gears. The latter causes much greater damage than the former. Therefore, the bearing oil is required to have excellent extreme pressure and anti-wear properties to ensure the long-term and stable operation of the traction motors.

[0003] TB / T2986-2000 uses the wear spot diameter index to indicate the anti-wear performance of oil products. The anti-wear performance requirement for the suspension bearing oil of railway locomotive traction motor is no more than 0.42mm, and the oil test conditions are specified as (392N, 30min, 1450r / min) at room temperature. The low-temperature performance of oil products is indicated by the low-temperature dynamic viscosity, solidification point, and pour point indicators. The oil product is required to have a kinematic viscosity of 52.0mm at 40°C. 2 / s~60.0mm 2 / s, the low temperature dynamic viscosity is not more than 200Pa·s as measured by the method of Appendix A of TB / T 2986-2000 (Appendix of the standard), the oil product solidification point is not higher than -40℃ as measured by the method of GB / T 510, and the oil product pour point is not higher than -35℃ as measured by the method of GB / T 3535. Sulfur-phosphorus extreme pressure anti-wear agents are generally used in lubricating oils to improve the oil film strength of the oil products. Due to their high activity, they will affect the antioxidant properties of the oil products to a certain extent, resulting in large amounts of sludge precipitation, increased bearing temperature, rapid coking, and other problems, affecting the service life of the oil products. The following prior art documents record the performance improvement research of bearing oil in this field, in which several additives such as the B-28 additive compound viscosity index improver studied by the Institute of Metallurgy of the China Academy of Railway Sciences are used to prepare bearing oil. However, none of their technical solutions provide higher anti-wear performance, low sludge precipitation, and high oxidation stability.

[0004] Therefore, there is an urgent need for a bearing oil composition that can improve the extreme pressure and anti-wear properties of the oil, reduce sludge precipitation, and maintain the low temperature performance and oxidation stability of the oil. Summary of the invention

[0005] In order to solve the above problems in the prior art, the present invention proposes a bearing oil composition and a preparation method and application thereof.

[0006] In a first aspect, the present invention provides a bearing oil composition, the components of which include:

[0007]

[0008] As a specific embodiment of the present invention, the base oil is a high viscosity index mineral oil; preferably, the high viscosity index VI>100;

[0009] More preferably, it is selected from a mixture of deeply refined mineral oil and 150BS or isomerized dewaxed hydrogenated base oil.

[0010] For example, the base oil may be HVI II + 4 and HVI 150BS, with a weight ratio of 55-61:37-42.

[0011] As a specific embodiment of the present invention, the extreme pressure anti-wear agent is selected from at least one of dialkyl dithiophosphate, triphenyl thiophosphate, basic bis-octyl alkyl zinc salt of sulfur phosphorus, trimethyl phosphate phenol, sulfur phosphorus nitrogen compounds; preferably selected from IR353, T309, T204, T306, RC3775. Its addition amount is controlled at 0.6-1.4wt%, preferably 0.6-1.2wt%, to improve the oil film strength of the oil product. When the addition amount is too small, the extreme pressure performance of the oil product cannot meet the requirements. When the addition amount reaches a certain amount, the extreme pressure performance of the oil product is not significantly improved if the addition amount is increased, and it will have a negative impact on other properties.

[0012] For example, the extreme pressure antiwear agent includes IR353 and at least one selected from T309, T204, T306, and RC3775, and the weight ratio of IR353 to at least one selected from T309, T204, T306, and RC3775 is 4:0-1, preferably 3:0-1.

[0013] As a specific embodiment of the present invention, the pour point depressant is selected from at least one of alkyl naphthalene, polymethacrylate, poly-α-olefin or polyfumarate; for example, but not limited to T801, Vx1-248, T803, T882. The addition amount is controlled at 0.5-1.0wt%. When the addition amount is too small, the low temperature performance of the oil product cannot meet the requirements; when the addition amount is too large, the low temperature performance of the oil product has no obvious improvement, and the pour point may rise and the low temperature performance may decrease.

[0014] As a specific embodiment of the present invention, the antioxidant includes at least one of alkyl-a-naphthylamine and N-phenyl-a-naphthylamine, such as but not limited to T501 and T552; the addition amount thereof is controlled at 1.3-1.5wt%, and the addition amount thereof should be controlled within a certain range. If the addition amount is too small, the antioxidant effect cannot be achieved; if the addition amount is too large, the appearance of the oil product may be unstable or the performance of other additives may be affected.

[0015] As a specific embodiment of the present invention, the rust inhibitor is selected from at least one of alkenyl succinic acid, benzotriazole, and dinonylnaphthalenesulfonic acid barium salt; for example, but not limited to T746, T706, and BSN. The amount of the rust inhibitor is controlled at 0.1 to 0.15 wt%. If the amount is too small, the rust inhibitor cannot achieve the desired effect. If the amount is too large, the extreme pressure and anti-wear properties or other properties of the oil may be affected.

[0016] As a specific embodiment of the present invention, the antifoaming agent is selected from at least one of polymethyl silicone oil, acrylate and ether copolymer, and modified silicon antifoaming agent. For example, but not limited to T901, T921, FOAM BAN 155, and FOAM BAN 130B. The amount added is controlled at 0.001-0.05wt%. If the amount added is too small, it cannot play the due antifoaming role. If the amount added is too large, it may affect the appearance of the oil product.

[0017] In a second aspect, the present invention provides a method for preparing a bearing oil composition, comprising the following steps:

[0018] S1: adding a pour point depressant to a base oil, heating and stirring, and cooling to obtain a first mixture;

[0019] S2: adding an extreme pressure antiwear agent, a pour point depressant, an antioxidant and a rust inhibitor to the first mixture obtained in step S1, and mixing them uniformly to obtain a second mixture;

[0020] S3: adding an antifoaming agent to the second mixture obtained in step S2, and mixing them evenly to obtain the bearing oil additive composition.

[0021] As a specific embodiment of the present invention, in the step S1, the heating temperature is 60-70°C, the stirring rate is 400-600 r / min, and the stirring time is 1-3h; and / or the cooling is to 40-50°C.

[0022] In step S2 and step S3, the mixing method is independently stirring, the stirring rate is independently 400-600 r / min, and the stirring time is independently 1-3 h.

[0023] The above raw materials in the present invention can be prepared in-house or commercially available, and the present invention is not particularly limited thereto.

[0024] In a third aspect, the present invention provides application of the bearing oil composition in the field of traction motors.

[0025] As a specific embodiment of the present invention, the bearing oil composition is used for lubrication of railway locomotive traction equipment, especially traction motors, to prevent the bearings from seizing.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The bearing oil composition of the present invention is optimized by the extreme pressure scheme of the bearing oil, and the extreme pressure anti-wear agent system suitable for the bearing oil is screened out. The extreme pressure anti-wear agent in the bearing oil is required to be non-toxic, odorless, ashless, less corrosive to metals, and have good hydrolysis stability. While improving the extreme pressure anti-wear performance, it has good compatibility with other additives. Sulfur-containing and phosphorus-containing extreme pressure anti-wear agent molecules can be adsorbed on the surface of the metal friction pair. Under high temperature and high load conditions, the active elements such as S and P in the molecules react with the metal to form a consumable protective layer with low shear strength, thereby achieving the purpose of reducing the friction and loss of the metal friction pair surface.

[0028] 2. The bearing oil composition of the present invention is shown in the examples that the extreme pressure and anti-wear properties of the oil are significantly improved, the diameter of the wear plate can be kept within 0.42 mm at 392N, 30min, 1500r / min, and room temperature, and the oil sludge can be kept within 300mg / kg.

[0029] 3. The preparation method of the bearing oil composition of the present invention is simple. The anti-wear bearing oil formula can be prepared using a single agent available on the domestic market, avoiding the use of a single preparation mode of a specific compounding agent. The oil product is more economical and has the advantage of guaranteed supply. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with specific embodiments, but they do not constitute any limitation to the present invention.

[0031] In each embodiment of the present invention, the specific information of the test method is as follows:

[0032] Determination of water content in petroleum products: distillation method (GB / T 260);

[0033] Petroleum products kinematic viscosity determination and dynamic viscosity calculation method (GB / T 265);

[0034] Determination of mechanical impurities in petroleum, petroleum products and additives (GB / T 511);

[0035] Calculation method for viscosity index of petroleum products (GB / T 1995);

[0036] Pour point determination of petroleum products (GB / T 3535);

[0037] Determination of flash point and fire point of petroleum products: Cleveland open cup method (GB / T 3536);

[0038] Petroleum products copper strip corrosion test method (GB / T 5096);

[0039] Determination of anti-wear properties of lubricating oil (four-ball machine method) (SH / T 0189);

[0040] Determination of sludge and corrosion tendency of inhibitory mineral oils (SH / T 0565).

[0041] Example 1

[0042] This embodiment provides a bearing oil composition and a preparation method thereof, and the specific details are as follows:

[0043] The bearing oil composition comprises the following components, in parts by weight:

[0044] Base oil, wherein base oil 1 is HVI II + 4, 59.935 parts and base oil 2 is HVI 150BS, 37.52 parts;

[0045] Extreme pressure anti-wear agent, including 0.8 parts of T204 and 0.6 parts of T306;

[0046] Pour point depressant: 0.5 parts VXI-248;

[0047] Antioxidant: 0.5 parts T501;

[0048] Rust inhibitor: 0.14 parts of BSN;

[0049] Antifoaming agent: 0.005 parts of FB155.

[0050] S1: According to the weight parts in Table 1, weigh the required amount of pour point depressant and add it to the mineral base oil, heat it to 60-70°C and stir it, maintain it for 1 hour and then reduce the temperature to 40-50°C;

[0051] S2: Weigh the required amount of extreme pressure anti-wear agent, pour point depressant, antioxidant, and rust inhibitor and add them to the mineral base oil containing pour point depressant, and stir until the mixture is completely dissolved and becomes transparent;

[0052] S3: Weigh a required amount of anti-foaming agent and stir for 30 minutes to obtain the anti-wear bearing oil composition.

[0053] The properties of the base oil are shown in Table 2, and the properties of the oil products are shown in Table 3.

[0054] Embodiments 2 to 4

[0055] Examples 2 to 4 provide bearing oil compositions and preparation methods thereof. The preparation method is the same as that of Example 1. The types and amounts of the components are shown in Table 1, the properties of the base oil are shown in Table 2, and the properties of the obtained bearing oil compositions are shown in Table 3.

[0056] Table 1 Components of the bearing oil composition of Examples 1 to 4 and Comparative Examples 1-2

[0057]

[0058]

[0059] Table 2 Base oil parameters

[0060] project <![CDATA[HVI II + 4]]> HVI 150BS Test methods Appearance transparent transparent Visual inspection <![CDATA[Density (20 °C) / (kg / m 3 )]]> 841.7 895.2 GB / T 0604 <![CDATA[Kinematic viscosity (40 °C) / (mm 2 / s)]]> 22.22 504.5 GB / T 265 <![CDATA[Kinematic viscosity (100 °C) / (mm 2 / s)]]> 4.457 31.68 GB / T 265 Viscosity Index 112 93 GB / T 1995 Water (volume fraction) / % trace trace GB / T 260

[0061] The kinematic viscosity (40° C.), viscosity index, pour point, wear spot diameter, copper corrosion and sludge were tested for Examples 1-4 and Comparative Examples 1-2. The test data are shown in Table 3:

[0062] Table 3 Performance parameters of the bearing oil compositions obtained in Examples 1-4 and Comparative Examples 1-2

[0063]

[0064]

[0065] In Table 1, Examples 1-2 are products of lower viscosity grade, and Examples 3-4 are products of higher viscosity grade.

[0066] In Table 3, the pour points of Examples 1-4 of the present invention are all lower than -35°C, and the diameter of the wear spot is less than 0.42mm, indicating that the product has excellent low temperature performance and extreme pressure anti-wear performance, which can meet the normal use of the oil product at low temperature and maintain sufficient oil film strength under low speed and high load conditions. At the same time, the viscosity-temperature performance, corrosion resistance and sludge control results of Examples 1-4 are all good, indicating that the oil product has good corrosion resistance and oxidation stability. The extreme pressure anti-wear agent of Examples 2 and 4 is 0.8 parts, and the amount of sludge is the least, so the extreme pressure anti-wear agent is preferably added in an amount of 0.6-1.2wt%. The viscosity of Comparative Example 1 has a greater impact on the anti-wear performance. The viscosity of the blended oil product using Class II hydrogenated base oil and 150BS is close to the lower limit of the index value, the wear spot diameter does not meet the standard, and other properties are good; Comparative Example 2 increases the dosage of extreme pressure anti-wear agent on the basis of Comparative Example 1, the wear spot diameter meets the standard, the amount of sludge increases, and other properties are good. When preparing the oil product, be careful not to adjust the viscosity to the lower limit. In comparative example 3, the viscosity of the oil is appropriate, the dosage of the extreme pressure anti-wear agent is reduced to below the lower limit, the wear spot diameter does not meet the standard, the amount of sludge increases, and other properties are good. When formulating the oil, it is noted that the dosage of the extreme pressure anti-wear agent must not be lower than the lower limit.

[0067] In summary, the bearing oil composition of the present invention uses a specific extreme pressure anti-wear agent system to improve the extreme pressure and anti-wear properties of the oil, reduce sludge precipitation, and maintain the low temperature performance and oxidation stability of the oil; at the same time, a formula for anti-wear bearing oil that can be formulated using a single agent available on the domestic market is announced, so that the oil has excellent performance and economy.

[0068] Any numerical value mentioned in the present invention, if there is only an interval of two units between any minimum value and any maximum value, includes all values ​​from the minimum value to the maximum value each time increasing by one unit. For example, if the amount of a component, or the value of a process variable such as temperature, pressure, time, etc. is declared to be 50-90, in this specification it means that 51-89, 52-88... and 69-71 and 70-71 are specifically listed. For non-integer values, 0.1, 0.01, 0.001 or 0.0001 can be appropriately considered as a unit. These are just some specially specified examples. In this application, in a similar manner, all possible combinations of numerical values ​​between the listed minimum and maximum values ​​are considered to have been disclosed.

[0069] It should be noted that the embodiments described above are only used to explain the present invention and do not constitute any limitation to the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present invention may be modified as specified within the scope of the claims of the present invention, and the present invention may be revised without departing from the scope and spirit of the present invention. Although the present invention described therein relates to specific methods, materials and embodiments, it does not mean that the present invention is limited to the specific examples disclosed therein, on the contrary, the present invention can be extended to all other methods and applications with the same functions.

Claims

1. A bearing oil composition, characterized in that: It is composed of the following components: Base oil 96.5~97.5 wt%; Extreme pressure anti-wear agent 0.6~1.4 wt%; Pour point depressant 0.5~1.0 wt%; Antioxidant 1.3~1.5wt%; Rust inhibitor 0.1~0.15 wt%; Antifoaming agent 0.001~0.05 wt%; The sum of the contents of the above components is 100wt%; The base oil is a high viscosity index mineral oil; the high viscosity index VI>100; the base oil is a mixture of Class II hydrogenated base oil and 150BS, and the weight ratio thereof is 55-61:37-42; the extreme pressure anti-wear agent is selected from at least one of dialkyl dithiophosphate, triphenyl thiophosphate, basic dioctyl alkyl zinc thiophosphate, trimethyl phosphate phenol, and thiophosphorus-nitrogen compounds.

2. The bearing oil composition according to claim 1, characterized in that: The content of the base oil in the bearing oil composition is 96.855-97.455 wt %.

3. The bearing oil composition according to claim 1, characterized in that: The extreme pressure anti-wear agent is selected from at least one of IR353, T309, T204, T306, and RC3775.

4. The bearing oil composition according to any one of claims 1 to 3, characterized in that: The pour point depressant is selected from at least one of alkyl naphthalene, polymethacrylate, poly-α-olefin or polyfumarate.

5. The bearing oil composition according to claim 4, characterized in that: The pour point depressant is selected from T801, Vx1-248, T803, and T882.

6. The bearing oil composition according to any one of claims 1 to 3, characterized in that: The antioxidant is selected from at least one of alkyl-a-naphthylamine and N-phenyl-a-naphthylamine.

7. The bearing oil composition according to any one of claims 1 to 3, characterized in that: The rust inhibitor is selected from at least one of alkenyl succinic acid, benzotriazole, and barium dinonylnaphthalenesulfonate.

8. The bearing oil composition according to any one of claims 1 to 3, characterized in that: The antifoaming agent is selected from at least one of polymethyl silicone oil, acrylate and ether copolymer, and modified silicon antifoaming agent.

9. A method for preparing the bearing oil composition according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: adding a pour point depressant to a base oil, heating and stirring, and cooling to obtain a first mixture; S2: adding an extreme pressure antiwear agent, a pour point depressant, an antioxidant and a rust inhibitor to the first mixture obtained in step S1, and mixing them uniformly to obtain a second mixture; S3: adding an anti-foaming agent to the second mixture obtained in step S2, and mixing them evenly to obtain the bearing oil composition.

10. The preparation method according to claim 9, characterized in that: In the step S1, the heating temperature is 60-70°C, the stirring rate is 400-600 r / min, and the stirring time is 1-3 h; and / or the cooling is to 40-50°C; And / or, in step S2 and step S3, the mixing method is independently stirring, the stirring rate is independently 400-600 r / min, and the stirring time is independently 1-3 h.

11. Use of the bearing oil composition according to any one of claims 1 to 8 or the bearing oil composition prepared by the preparation method according to claim 9 or 10 in the field of traction motors.

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