Gear oil composition and application thereof

Abstract

The invention belongs to the field of lubricating oil, and particularly relates to a gear oil composition and application thereof. The gear oil composition comprises the following components in parts by weight: base oil, a sulfur type extreme pressure agent and a phosphorus type anti-wear agent, the mass ratio of the sulfur type extreme pressure agent to the phosphorus type anti-wear agent is 1: (0.5-2), and the mass ratio of the sulfur type extreme pressure agent to the phosphorus type anti-wear agent in the gear oil composition is 1.0%-5.0%. The special oil composition for the seawater circulating pump gear box provided by the invention can improve the compatibility and salt fog resistance to multiple metals, meets the special requirements of customers on the seawater circulating pump gear oil adopting traditional bearings and sliding bearing gear boxes, and has the advantages of excellent shear stability, oxidation stability, excellent sediment control, excellent corrosion resistance, excellent corrosion resistance and the like. The seawater circulating pump has the advantages of long tooth surface wear protection, low foaming tendency and no harmful chemical substances in the system, so that the seawater circulating pump has a wider application prospect in the seawater circulating pump market.

Description

Technical Field

[0001] This invention belongs to the field of lubricating oil, specifically relating to a gear oil composition and its application. Background Technology

[0002] Nuclear power, as a low-carbon and sustainable clean energy source, can effectively replace traditional energy sources such as coal and oil. The seawater circulating pump gearbox is one of the key pieces of equipment in a nuclear power unit, used to provide seawater cooling water to the nuclear island and conventional island equipment. To meet the demands of special operating conditions, the seawater circulating pump gearbox has extremely high requirements for raw materials, manufacturing processes, and assembly methods. Furthermore, to ensure the long-term stable operation and sustainable development of the nuclear power plant, the seawater circulating pump gearbox is generally designed with a service life of up to 40 years.

[0003] Due to their small radial dimensions and high load-bearing capacity, sliding bearings can replace traditional bearings in main bearings and planetary and parallel-stage bearings in gearboxes. Compared to seawater circulating pump gearboxes using traditional bearings, those using sliding bearings offer significantly higher torque density, reduced transmission chain length and gearbox weight, and increased transmission efficiency. Therefore, the application of sliding bearings is one of the most promising design solutions for future seawater circulating pump gearboxes.

[0004] The main structures of sliding bearings include tilting pad Babbitt alloy bearings, plastic pad bearings, tapered sliding bearings, and flexible tapered sliding bearings. Traditional seawater circulating pump gear oils, due to extreme pressure and anti-wear requirements, have high activity of sulfur and phosphorus components in their system. Prolonged use may lead to chemical reactions with the metals in the gearbox, resulting in a decrease in gear transmission efficiency. Therefore, next-generation seawater circulating pump gear oil technology needs to exhibit excellent multi-metal compatibility and salt spray resistance in seawater circulating pump gearboxes containing sliding bearing structures. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a gear oil composition and its application. This invention provides a new generation of seawater circulating pump gearbox oil composition that is multi-metal compatible and resistant to salt spray, which can effectively upgrade existing seawater circulating pump gear oils.

[0006] In a first aspect, the present invention provides a gear oil composition comprising the following components by weight: base oil, sulfur-type extreme pressure agent, and phosphorus-type anti-wear agent; the mass ratio of the sulfur-type extreme pressure agent to the phosphorus-type anti-wear agent is 1:0.5~2, and the mass percentage of the sulfur-type extreme pressure agent and the phosphorus-type anti-wear agent in the gear oil composition is 1.0%~5.0%. The gear oil composition provided by the present invention, through the base oil, a specific amount of sulfur-type extreme pressure agent, and phosphorus-type anti-wear agent, satisfies multiple factors such as gearbox load, operating conditions, and gear surface oil film thickness. The base oil provides excellent lubrication and stability, ensuring oil film thickness under high load conditions; the sulfur-type extreme pressure agent added to the composition enhances extreme pressure performance, while the sulfur content is relatively low, and the elemental valence state is relatively small, making it less likely to react with metal parts in the gearbox, thus improving corrosion resistance; the phosphorus-type anti-wear agent added to the system improves anti-wear and anti-oxidation performance by forming a protective film, and enhances salt spray resistance, effectively preventing seawater corrosion. This combination optimizes the overall performance of gear oils in high-load, harsh environments, making it particularly suitable for high-power seawater circulating pump gearboxes.

[0007] Preferably, the sulfur-type extreme pressure agent is a sulfurized olefin and / or an alkyl polysulfide.

[0008] Preferably, the sulfur-type extreme pressure agent is selected from one or more of sulfurized isobutylene, sulfurized butadiene, sulfurized isoprene, sulfurized cis-hexadiene, sulfurized methylbutadiene, sulfurized olefin fatty acid esters, dialkyl pentasulfides, dioctyl pentasulfides, di-tert-butyl trisulfides, and di-tert-butyl dodecyl polysulfides; more preferably, the sulfur-type extreme pressure agent is di-tert-butyl trisulfide, such as T325. Preferred sulfur-type extreme pressure agents, such as sulfurized olefins and / or alkyl polysulfides, especially di-tert-butyl trisulfide (T325), can significantly enhance the extreme pressure performance and anti-wear ability of gear oils, while reducing the risk of corrosion in the gearbox.

[0009] Preferably, the phosphorus-type anti-wear agent is selected from one or more of phosphites, phosphate derivatives, and zinc dialkyl dithiophosphate; more preferably, the phosphorus-type anti-wear agent is butyl isooctyl phosphate dodecylamine salt, such as T308B. Preferred phosphorus-type anti-wear agents, such as butyl isooctyl phosphate dodecylamine salt (T308B), improve the anti-wear performance and oxidation resistance of gear oil by forming a robust protective film, effectively extending the service life of gears.

[0010] Preferably, the gear oil composition comprises the following components by weight: 94-98% base oil, 0.5-2.5% sulfur-type extreme pressure agent, and 0.5-2.5% phosphorus-type anti-wear agent; more preferably, 94-96% base oil, 0.5-2% sulfur-type extreme pressure agent, and 0.5-2% phosphorus-type anti-wear agent; more preferably, 94-100% base oil, 1.0% sulfur-type extreme pressure agent, and 1.5% phosphorus-type anti-wear agent. In this invention, with the preferred amounts of base oil, sulfur-type extreme pressure agent, and phosphorus-type anti-wear agent, the gear oil composition achieves optimal lubrication and anti-wear performance, while ensuring stability and corrosion resistance under high loads and salt spray environments. This optimized formulation not only effectively reduces metal wear and corrosion within the gearbox but also significantly improves the service life and reliability of the gear oil, making it particularly suitable for high-power seawater circulating pump gearboxes.

[0011] This invention further optimizes the gearbox oil for seawater circulating pumps through the blending of various raw materials and the optimization of performance and cost.

[0012] Preferably, the gearbox oil comprises the following components in weight percentage:

[0013] In this invention, by optimizing the components and dosage of the gearbox oil, the resulting composition exhibits better performance.

[0014] Preferably, the base oil is a synthetic oil and / or a hydrotreated base oil; preferably, the viscosity grade of the base oil is 85~115.

[0015] Further preferably, the hydrotreated base oil is a Group III hydrotreated base oil; and / or, the synthetic oil is a polyalphaolefin and / or ester oil; preferably, the synthetic oil is selected from those containing C8~C64. 12 The repeating unit comprises one or more of polyalphaolefins, diesters, polyol esters, aromatic carboxylic acid esters, and complex esters. In this invention, due to the long service life requirement of the oil used in seawater circulating pump gearboxes, the base oil of the special oil for seawater circulating pump gearboxes described in this invention is preferably a specific synthetic oil.

[0016] Preferably, the copper corrosion inhibitor is thiadiazole and / or a derivative of thiadiazole. The preferred copper corrosion inhibitor can effectively prevent corrosion of copper and copper alloy components in the gearbox, ensuring the long-term reliability of the equipment.

[0017] Preferably, the antioxidant is selected from one or more of dialkyldiphenylamine, dodecenyl succinate half ester, succinate half ester derivative, phosphate ester, oleic acid sarcosine, and phenolic antioxidants.

[0018] Preferably, the rust inhibitor is dodecenyl succinic acid and / or barium dinonylnaphthalene sulfonate.

[0019] Preferably, the metal deactivator is a tritriazole fatty amine salt and / or methyltriazole.

[0020] Preferably, the dispersant is borosuccinimide and / or synthetic calcium sulfonate.

[0021] Preferably, the friction modifier is a molybdenum amine ester. Preferred friction modifiers, such as molybdenum amine esters, can significantly reduce the coefficient of friction, improve gear transmission efficiency, and reduce energy consumption and wear.

[0022] Preferably, the antifoaming agent is selected from one or more of methylsiloxanes, acrylates, and acrylate derivatives. Preferred antifoaming agents such as methylsiloxanes, acrylates, and their derivatives can effectively control foam formation in gear oil, ensuring the stability and lubrication effect of the lubricating oil under high-speed conditions.

[0023] This invention provides a gear oil composition suitable for seawater circulating pump gearboxes. Based on a specific ratio of the aforementioned base oil, sulfur-type extreme pressure agent, and phosphorus-type anti-wear agent, this composition optimizes the types of copper corrosion inhibitors, antioxidants, rust inhibitors, metal deactivators, dispersants, friction modifiers, and antifoaming agents. The interaction between these components not only meets the stringent requirements of seawater circulating pump gearboxes for materials and manufacturing processes but also further improves multi-metal compatibility, salt spray resistance, wear resistance, oxidation resistance, antifoaming properties, and sediment control, thus extending service life. It exhibits excellent performance in seawater environments and is particularly suitable for seawater circulating pump gearboxes.

[0024] More preferably, the gear oil composition comprises the following components in weight percentage:

[0025] This invention optimizes the composition and dosage of lubricating oil to obtain a special oil composition for seawater circulating pump gearboxes that can simultaneously meet the requirements of excellent comprehensive performance in terms of viscosity-temperature performance, anti-oxidation, anti-wear, anti-emulsification, anti-salt spray, and multi-metal compatibility.

[0026] Secondly, the present invention provides the application of the gear oil composition in the gear lubrication of a high-power seawater circulating pump gearbox.

[0027] The beneficial effects of this invention are at least as follows: the gear oil composition for seawater circulating pump gearboxes provided by this invention improves compatibility with multiple metals and salt spray resistance, meeting the special requirements of customers for seawater circulating pump gear oil in gearboxes using traditional bearings and sliding bearings. Excellent shear stability, oxidation stability, excellent sediment control, long-lasting tooth surface wear protection, low foaming tendency, and the absence of harmful chemicals in the system give it a broader application prospect in the seawater circulating pump market. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with this invention. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0029] Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field, or in accordance with the product manual. Instruments and other equipment whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels. Unless otherwise specified, the methods described are conventional methods, and the raw materials described are all obtainable from publicly available commercial sources.

[0030] The corrosion degree of lubricating oil on copper components was evaluated according to the method specified in GB / T 5096-2017 "Petroleum Products - Test Method for Copper Strip Corrosion". The selected sample was a bronze part of a sliding bearing, placed in a test tube with an outer diameter of 25 mm, a length of 150 mm, and a wall thickness of 1 mm to 2 mm. The part was submerged in lubricating oil and placed in an oven at 120 ℃. The corrosion degree on the part surface was observed using a standard colorimetric chart for copper strip corrosion testing after 7, 14, and 21 consecutive days.

[0031] The multimetal compatibility performance of the lubricating oil was evaluated using the Linde VDMA 24570 test. At a test temperature of 120 °C, the lubricating oil being evaluated was applied to the surface of samples from various material groups, with continuous mechanical activation of the material surfaces by glass bulbs. After 96 hours of testing, the weight change of the samples was determined in g / m² and expressed as the weight loss of a single material group.

[0032] The salt spray resistance of lubricating oils was evaluated according to the method specified in GB / T 11143-2008 "Test Method for Rust Prevention Performance of Mineral Oils with Inhibitors in the Presence of Water". A test steel rod was placed in a test oil sample mixed with synthetic seawater and stirred at 60℃ and 1000 r / min for 24 h. After the stirring, the surface of the test steel rod was observed for any visible rust spots or streaks.

[0033] In the following embodiments of the present invention, PAO-10, PAO-40 and trimethylolpropane octyl decanoate were used in the base oil in a mass ratio of 6:3:1.

[0034] Example 1

[0035] The composition of the special oil for the seawater circulating pump gearbox provided in this embodiment is shown in Table 1. Its preparation method includes mixing the various additive components according to the following ratio using an ABB automatic blending system, and stirring at 50°C for 3 hours to obtain the composition. In Example 1, the sulfur-type extreme pressure agent T325 accounts for 1% of the composition, and the phosphorus-type anti-wear agent butyl isooctyl phosphate dodecylamine salt T308B accounts for 1.5%.

[0036] Table 1 Composition of Special Oil for Seawater Circulating Pump Gearbox

[0037] Example 2

[0038] The composition of the special oil for the seawater circulating pump gearbox provided in this embodiment is shown in Table 2. Its preparation method includes mixing the various additive components according to the following ratio using an ABB automatic blending system, and stirring at 50°C for 3 hours to obtain the composition. In Example 2, the sulfur-type extreme pressure agent T325 accounts for 1.5%, and the phosphorus-type anti-wear agent butyl isooctyl phosphate dodecylamine salt T308B accounts for 1.5%. Compared to Example 1, only the amount of sulfur-type extreme pressure agent is changed.

[0039] Table 2 Composition of Special Oil for Seawater Circulating Pump Gearbox

[0040] Example 3

[0041] The composition of the special oil for the seawater circulating pump gearbox provided in this embodiment is shown in Table 3. Its preparation method includes mixing the various additive components according to the following ratio using an ABB automatic blending system, and stirring at 50°C for 3 hours to obtain the composition. In Example 3, the sulfur-type extreme pressure agent T325 accounts for 2%, and the phosphorus-type anti-wear agent butyl isooctyl phosphate dodecylamine salt T308B accounts for 1.5%. Compared to Example 1, only the amount of sulfur-type extreme pressure agent is changed.

[0042] Table 3 Composition of Special Oil for Seawater Circulating Pump Gearbox

[0043] Example 4

[0044] The composition of the special oil for the seawater circulating pump gearbox provided in this embodiment is shown in Table 4. Its preparation method includes mixing the various additive components according to the following ratio using an ABB automatic blending system, and stirring at 50°C for 3 hours to obtain the composition. In Example 4, the sulfur-type extreme pressure agent T325 accounts for 1% of the composition, and the phosphorus-type anti-wear agent butyl isooctyl phosphate dodecylamine salt T308B accounts for 1.5%. Compared to Example 1, the type and amount of metal deactivating agent are changed.

[0045] Table 4 Composition of Special Oil for Seawater Circulating Pump Gearbox

[0046] Example 5

[0047] The composition of the special oil for the seawater circulating pump gearbox provided in this embodiment is shown in Table 5. Its preparation method includes mixing the various additive components according to the following ratio using an ABB automatic blending system, and stirring at 50°C for 3 hours to obtain the composition. In Example 5, the sulfur-type extreme pressure agent accounts for 1.5%, and the phosphorus-type anti-wear agent accounts for 1.5%. Compared to Example 2, the type and amount of the metal deactivator are changed.

[0048] Table 5 Composition of Special Oil for Seawater Circulating Pump Gearbox

[0049] Example 6

[0050] The composition of the special oil for the seawater circulating pump gearbox provided in this embodiment is shown in Table 6. Its preparation method includes mixing the various additive components according to the following ratio using an ABB automatic blending system, and stirring at 50°C for 3 hours to obtain the composition. In Example 6, the sulfur-type extreme pressure agent T325 accounts for 2%, and the phosphorus-type anti-wear agent butyl isooctyl phosphate dodecylamine salt T308B accounts for 1.5%. Compared to Example 3, the type and amount of metal deactivating agent are changed.

[0051] Table 6 Composition of Special Oil for Seawater Circulating Pump Gearbox

[0052] Comparative Example 1

[0053] Commercially available seawater circulating pump gear oil 1, lubricant viscosity grade 100.

[0054] Comparative Example 2

[0055] Commercially available seawater circulation pump gear oil 2, lubricant viscosity grade 100.

[0056] The seawater circulating pump gearbox oil compositions prepared in each embodiment and comparative example were tested according to the above test methods. The results are shown in the table below.

[0057] Table 7. Copper strip corrosion test results of the special oil composition for seawater circulating pump gearboxes.

[0058] Table 8. Multimetal compatibility test results of the special oil composition for seawater circulating pump gearboxes.

[0059] Table 9. Liquid phase corrosion test results of the special oil composition for seawater circulating pump gearboxes.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gear oil composition, characterized in that, It includes the following components: base oil, sulfur-type extreme pressure agent and phosphorus-type anti-wear agent; the mass ratio of the sulfur-type extreme pressure agent and the phosphorus-type anti-wear agent is 1:0.5~2, and the mass percentage of the sulfur-type extreme pressure agent and the phosphorus-type anti-wear agent in the gear oil composition is 1.0%~5.0%.

2. The gear oil composition according to claim 1, characterized in that, The sulfur-type extreme pressure agent is selected from one or more of the following: sulfurized isobutylene, sulfurized butadiene, sulfurized isoprene, sulfurized cis-hexadiene, sulfurized methylbutadiene, sulfurized olefin fatty acid ester, dialkyl pentasulfide, dioctyl pentasulfide, di-tert-butyl trisulfide, and di-tert-butyl dodecyl polysulfide.

3. The gear oil composition according to claim 1 or 2, characterized in that, The phosphorus-type anti-wear agent is selected from one or more of phosphites, phosphate derivatives, and zinc dialkyl dithiophosphate.

4. The gear oil composition according to claim 1, characterized in that, It comprises the following components by weight: 94-98% base oil, 0.5-2.5% sulfur-type extreme pressure agent, and 0.5-2.5% phosphorus-type anti-wear agent; preferably, 94-96% base oil, 0.5-2% sulfur-type extreme pressure agent, and 0.5-2% phosphorus-type anti-wear agent.

5. The gear oil composition according to any one of claims 1-4, characterized in that, Composed of the following ingredients in weight percentage composition:

6. The gear oil composition according to claim 5, characterized in that, The base oil is a synthetic oil and / or a hydrotreated base oil; preferably, the viscosity grade of the base oil is 85~115.

7. The gear oil composition according to claim 6, characterized in that, The hydrotreated base oil is a Group III hydrotreated base oil; and / or, the synthetic oil is a polyalphaolefin and / or ester oil; preferably, the synthetic oil is selected from oils containing C8 to C96. 12 One or more of the repeating unit, such as polyalphaolefin, diester, polyol ester, aromatic carboxylic acid ester, and complex ester.

8. The gear oil composition according to any one of claims 5-7, characterized in that, The copper corrosion inhibitor is thiadiazole and / or a derivative of thiadiazole; And / or, the antioxidant is selected from one or more of dialkyldiphenylamine, dodecenyl succinate half ester, succinate half ester derivative, phosphate ester, oleic acid sarcosine, and phenolic antioxidants; And / or, the rust inhibitor is dodecenyl succinic acid and / or barium dinonylnaphthalene sulfonate; And / or, the metal deactivator is a benzotriazole fatty amine salt and / or methylbenzotriazole; And / or, the dispersant is borosuccinimide and / or synthetic calcium sulfonate; and / or, the friction modifier is molybdenum amine ester; And / or, the antifoaming agent is selected from one or more of methylsiloxane, acrylate, and acrylate derivatives.

9. The gear oil composition according to any one of claims 1-8, characterized in that, The gear oil composition comprises the following components in weight percentages. composition:

10. The use of the gear oil composition according to any one of claims 1-9 in the gear lubrication of a high-power seawater circulating pump gearbox.

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