A high viscosity oil gas lubricating oil composition for cold rolling mill and a method of preparation

Abstract

The application relates to the technical field of lubricating oil, and discloses a high-viscosity oil-air lubricating oil composition for a cold rolling mill and a preparation method.The high-viscosity oil-air lubricating oil composition for the cold rolling mill comprises the following components in percentage by mass: base oil 67-76%; viscosity index improver 5-7%; extreme pressure agent 10-12%; oiliness agent 4-6%; antioxidant 2-3%; metal deactivator 1-2%; and cleaning dispersant 2-3%. The high-viscosity oil-air lubricating oil composition for the cold rolling mill has excellent lubricating, antioxidant and anti-coking performances, can still provide sufficient oil film strength under heavy load conditions, helps to keep the lubrication of a rolling mill bearing for a long time, and can ensure the smooth progress of the rolling process under high load.

Description

Technical Field

[0001] This application relates to the field of lubricating oil technology, and mainly to a high-viscosity oil-gas lubricating oil composition for cold rolling mills and its preparation method. Background Technology

[0002] Oil-air lubrication is an advanced lubrication technology that uses high-pressure air as the dispersion medium to disperse lubricating oil into unatomized droplets. These droplets are then intermittently and metered into the inner wall of a pipe, forming a thin, continuous oil film. Driven by the airflow, the oil film travels to the nozzle, where it coalesces into fine, continuous droplets under high pressure and is then ejected towards the lubrication point. Oil-air lubrication technology offers advantages such as good cleanliness, low oil consumption, and high utilization rate, and it does not produce excessive oil mist, thus causing no environmental pollution.

[0003] Most existing cold rolling mill roll bearings use oil-air lubrication systems. However, cold rolling mill rolls often operate under harsh conditions such as high temperature, heavy load, long-term continuous operation, and a easily contaminated bearing lubrication environment. This places higher demands on the performance of the oil-air lubricating oil in the oil-air lubrication system.

[0004] As the lubricating medium for roll bearings in an oil-air lubrication system, oil-air lubricating oil should possess sufficient lubrication performance to ensure effective lubrication of the bearings under high loads. One important solution is to use high-viscosity oils to form a high-strength oil film in the lubrication area. However, simply increasing the viscosity of the oil-air lubricating oil can negatively impact its oxidation resistance, leading to coking, reduced service life, and potential damage to the oil-air lubrication system. Currently, the kinematic viscosity of oil-air lubricating oils proposed in existing technologies is mostly between 200-300 mmHg at 40°C. 2 Within the range of / s, its lubrication and extreme pressure anti-wear properties are insufficient to meet the lubrication requirements of roll bearings under increasingly high roll loads during cold rolling. Furthermore, high-viscosity oils generally have low oxidation resistance (for example, in the prior art Chinese invention patent CN111303972A, the oxidation stability of its embodiment is less than 30 minutes). Therefore, it is necessary to develop a high-viscosity oil-gas lubricant with high oxidation resistance to help maintain lubrication of cold rolling mill roll bearings for extended periods, ensuring smooth operation of the high-load rolling process.

[0005] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this application is to provide a high viscosity oil-gas lubricating oil composition and preparation method for cold rolling mills, aiming to solve the problem that the existing oil-gas lubricating oils are difficult to meet the lubrication problem of roll bearings under high load conditions in terms of lubrication and extreme pressure anti-wear properties.

[0007] The technical solution of this application is as follows:

[0008] This application provides a high-viscosity oil-gas lubricating oil composition for cold rolling mills, wherein, by mass percentage, it comprises the following components:

[0009] Base oil 67-76%;

[0010] Viscosity index improver 5-7%;

[0011] Extreme pressure agent 10-12%;

[0012] Oiliness agent 4-6%;

[0013] Antioxidant 2-3%;

[0014] Metal deactivating agent 1-2%;

[0015] 2-3% detergent dispersant.

[0016] The high-viscosity oil-gas lubricating oil composition for cold rolling mills provided in this application has excellent lubrication, anti-oxidation and anti-coking properties, and can still provide sufficient oil film strength under heavy load conditions, which can effectively meet the processing requirements of cold rolling mills.

[0017] Furthermore, the base oil is one or more of the following: polyalphaolefin synthetic oil, synthetic esters, Group I mineral base oil, Group II mineral base oil, and Group III mineral base oil; the viscosity index improver is one of the following: polyethylene n-butyl ether, polymethyl methacrylate, ethylene-propylene copolymer, polyacrylate, styrene polyester, hydrogenated styrene-butadiene, hydrogenated styrene-isoprene copolymer, and polyisobutylene.

[0018] Furthermore, the polyisobutylene is polyisobutylene-1300, and the viscosity index improver is polyisobutylene-1300;

[0019] The polyalphaolefin synthetic oil is polyalphaolefin synthetic oil PAO-100, and the Group II mineral base oil is Group II base oil 500N;

[0020] The base oil is a combination of the polyalphaolefin synthetic oil PAO-100 and Group II base oil 500N;

[0021] The polyalphaolefin synthetic oil PAO-100 accounts for 26-31% by mass in the high viscosity oil-gas lubricant composition for cold rolling mills, and the Group II base oil 500N accounts for 41-45% by mass in the high viscosity oil-gas lubricant composition for cold rolling mills.

[0022] Further, the oiliness agent is one or more of tall oil, fatty acid methyl ester, oleic acid, tall oil fatty acid, ricinoleic acid, coconut oil acid, pentaerythritol oleate, cottonseed oil, neodecanoic acid and trimethylolpropane oleate.

[0023] The extreme pressure agent is one or more of the following: phosphate ester, ammonium phosphate salt, phosphoramide, sulfurized animal oil, sulfurized fatty acid ester, hydrocarbon sulfide, and benzyl sulfide.

[0024] Furthermore, the oiliness agent is the trimethylolpropane oleate;

[0025] The phosphate ester is diisooctyl phosphate;

[0026] The extreme pressure agent is a combination of diisooctyl phosphate, sulfurized fatty acid ester, and hydrocarbon sulfide. The mass percentage of diisooctyl phosphate in the high viscosity oil-gas lubricating oil composition for cold rolling mills is 3-4%, the mass percentage of sulfurized fatty acid ester in the high viscosity oil-gas lubricating oil composition for cold rolling mills is 5-6%, and the mass percentage of hydrocarbon sulfide in the high viscosity oil-gas lubricating oil composition for cold rolling mills is 1-2%.

[0027] Further, the antioxidant is one or more of 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butyl mixed phenols, N,N-diethylhydroxylamine, cyclohexylamine, N,N-di-sec-butyl-p-phenylenediamine, alkyl diphenylamine, thiocarbamate, disododecyl thiodipropionate, and disodadecyl thiodipropionate.

[0028] Further, the antioxidant is a combination of 2,6-di-tert-butyl-p-cresol, N,N-diethylhydroxylamine, and dioctadecyl thiodipropionate; the 2,6-di-tert-butyl-p-cresol comprises 0.5-0.7% by mass in the high-viscosity oil-gas lubricating oil composition for cold rolling mills, the N,N-diethylhydroxylamine comprises 0.7-1% by mass in the high-viscosity oil-gas lubricating oil composition for cold rolling mills, and the dioctadecyl thiodipropionate comprises 0.8-1.5% by mass in the high-viscosity oil-gas lubricating oil composition for cold rolling mills.

[0029] Further, the detergent dispersant is one or more of polyisobutylene monosuccinimide, polyisobutylene bissuccinimide, succinimide, synthetic calcium sulfonate, polyetheramine, alkyl salicylate calcium, synthetic magnesium sulfonate, and alkylphenol calcium sulfide; the metal deactivator is one or more of thiadiazole derivatives, benzotriazole derivatives, benzotriazole, methylbenzotriazole, and methylbenzotriazole sodium salt.

[0030] Further, the detergent-dispersant is a combination of the synthetic magnesium sulfonate and calcium alkylphenol sulfide; the synthetic magnesium sulfonate accounts for 1-1.5% by mass in the high-viscosity oil-gas lubricating oil composition for cold rolling mills, and the calcium alkylphenol sulfide accounts for 1-1.5% by mass in the high-viscosity oil-gas lubricating oil composition for cold rolling mills;

[0031] The metal deactivator is benzotriazole.

[0032] This application also provides a method for preparing the high-viscosity oil-gas lubricating oil composition for cold rolling mills as described above, comprising the following steps:

[0033] The base oils are mixed to obtain a base oil mixture, which is then stirred at 60-65°C until clear and transparent;

[0034] A viscosity index improver, an oiliness agent, an extreme pressure agent, an antioxidant, a metal deactivator, and a detergent-dispersant are added slowly in sequence to the base oil mixture, and the mixture is stirred until the solution is clear and transparent to obtain a high viscosity oil-gas lubricating oil composition for cold rolling mills.

[0035] The high-viscosity oil-gas lubricating oil composition for cold rolling mills provided in this application has the following beneficial effects:

[0036] (1) Good lubrication and viscosity-temperature properties. The high-viscosity oil-gas lubricating oil composition for cold rolling mills of this application has a high viscosity, which can form a high-strength lubricating film; the compounding of the base oil can effectively disperse the extreme pressure agent and the oiliness agent, and can form a uniform, continuous and easily adsorbed lubricating film during use, which can effectively reduce the wear of the roll bearings. The high-viscosity base oil and viscosity index improver are used in combination to ensure that the oil-gas lubricating oil composition still has sufficient oil film strength under high temperature environment.

[0037] (2) Good antioxidant and anti-carbon deposit properties. The introduction of synthetic base oil PAO-100 into the base oil can alleviate oxidative carbon deposits; through the optimized dosage of amine / phenol / thioester compound system in antioxidants, the compound system of synthetic magnesium sulfonate / calcium sulfide in detergent dispersant and metal deactivator can form an effective synergistic effect, so that high viscosity oil-gas lubricating oil has high antioxidant properties to improve service life, effectively prevent the formation and accumulation of carbonaceous material and gum to ensure the cleanliness of the oil-gas lubrication system, and at the same time slow down metal corrosion. Detailed Implementation

[0038] This application provides a high-viscosity oil-gas lubricating oil composition for cold rolling mills and a method for its preparation. To make the objectives, technical solutions, and effects of this application clearer and more explicit, the following provides a more detailed description. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0039] This application provides a high-viscosity oil-gas lubricating oil composition for cold rolling mills, wherein, by mass percentage, it comprises the following components:

[0040] Base oil 67-76%;

[0041] Viscosity index improver 5-7%;

[0042] Extreme pressure agent 10-12%;

[0043] Oiliness agent 4-6%;

[0044] Antioxidant 2-3%;

[0045] Metal deactivating agent 1-2%;

[0046] 2-3% detergent dispersant.

[0047] Base oil is the most important component of the oil-air lubricant composition, accounting for the vast majority of the composition. The strength of the oil film formed on the friction surface during use directly determines the lubrication performance of the oil-air lubricant. Furthermore, the base oil can dissolve functional additives. Specifically, the base oil is one or more of the following: polyalphaolefin synthetic oil, synthetic esters, Group I mineral base oil, Group II mineral base oil, and Group III mineral base oil. The polyalphaolefin synthetic oil can be polyalphaolefin synthetic oil PAO-100, and the Group II mineral base oil can be Group II base oil 500N. Preferably, the base oil is a combination of polyalphaolefin synthetic oil PAO-100 and Group II base oil 500N, wherein the mass percentage of polyalphaolefin synthetic oil PAO-100 in the high-viscosity oil-air lubricant composition for cold rolling mills is 26-31%, and the mass percentage of Group II base oil 500N in the high-viscosity oil-air lubricant composition for cold rolling mills is 41-45%. The selected base oil combination is miscible and has high viscosity, and can maintain excellent lubrication, anti-oxidation, anti-coking and dissolution properties under heavy-load working conditions of cold rolling mills.

[0048] Viscosity index improvers are additives that improve the viscosity-temperature properties of oils, ensuring sufficient viscosity for lubricating film formation even at high temperatures. They are mostly oil-soluble polymers. Further, the viscosity index improver is one of the following: polyethylene butyl ether, polymethacrylate, ethylene-propylene copolymer, polyacrylate, styrene polyester, hydrogenated styrene-butadiene, hydrogenated styrene-isoprene copolymer, and polyisobutylene. The polyisobutylene can be polyisobutylene-1300. Preferably, the viscosity index improver is polyisobutylene-1300, which is completely soluble in the base oil selected in this application, ensuring that the oil-air lubricating oil remains stable and possesses sufficient oil film strength in heavily loaded, high-temperature bearings, thus guaranteeing lubrication performance.

[0049] Oiliness agents can be adsorbed onto friction surfaces through polar groups, forming a molecularly oriented adsorption film that prevents contact between friction pairs within the roll bearing, thereby reducing friction and wear. The highly adsorbent oiliness agent and the highly viscous base oil work synergistically to further improve the lubrication performance of the oil film. Further, the oiliness agent is one or more of tall oil, fatty acid methyl ester, oleic acid, tall oil fatty acid, ricinoleic acid, coconut oil acid, pentaerythritol oleate, cottonseed oil, neodecanoic acid, and trimethylolpropane oleate. Preferably, the oiliness agent is trimethylolpropane oleate. The preferred trimethylolpropane oleate has a lower cost, is readily soluble in base oil, and easily adsorbs onto the surface of the rolling mill bearing to form a lubricating film.

[0050] Extreme pressure additives are heavy-duty additives that react with the surfaces of friction pairs under extreme and harsh conditions such as high temperature and high pressure to form an extreme pressure lubricating film. The surfaces of roll bearings in cold rolling mills are not completely smooth. Under heavy loads, the oil film may not be able to prevent the contact of tiny protrusions in the friction pair, resulting in high temperature and wear. In this case, extreme pressure additives are needed to ensure lubrication performance. Further, the extreme pressure additive is one or more of phosphate esters, ammonium phosphate salts, phosphoramides, sulfurized animal oils, sulfurized fatty acid esters, hydrocarbon sulfides, and benzyl sulfides. Preferably, the phosphate ester is diisooctyl phosphate; the extreme pressure additive is a combination of diisooctyl phosphate, sulfurized fatty acid esters, and hydrocarbon sulfides, wherein the mass percentage of diisooctyl phosphate in the high-viscosity oil-gas lubricating oil composition for cold rolling mills is 3-4%, the mass percentage of sulfurized fatty acid esters in the high-viscosity oil-gas lubricating oil composition for cold rolling mills is 5-6%, and the mass percentage of hydrocarbon sulfides in the high-viscosity oil-gas lubricating oil composition for cold rolling mills is 1-2%. The preferred extreme pressure agent combination is completely soluble in the base oil, and the application provides a suitable compounding ratio, enabling the extreme pressure agent combination to form excellent extreme pressure anti-wear effect in high-temperature, heavy-duty cold rolling mill bearings.

[0051] The bearing temperatures of high-load rolls in rolling mills are often high. Oil-based lubricating oil is prone to oxidation under high temperatures, producing carbonaceous or gum-like substances that damage the bearings. To mitigate this and extend the oil's service life, antioxidants are added to the composition. Further, the antioxidant is one or more of the following: 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butyl-mixed phenols, N,N-diethylhydroxylamine, cyclohexylamine, N,N-di-sec-butyl-p-phenylenediamine, alkyl diphenylamine, thiocarbamate, disodium dodecyl thiodipropionate, and disodium octadecyl thiodipropionate. Preferably, the antioxidant is a combination of 2,6-di-tert-butyl-p-cresol, N,N-diethylhydroxylamine, and dioctadecyl thiodipropionate, wherein the mass percentage of 2,6-di-tert-butyl-p-cresol in the high-viscosity oil-gas lubricating oil composition for cold rolling mills is 0.5-0.7%, the mass percentage of N,N-diethylhydroxylamine in the high-viscosity oil-gas lubricating oil composition for cold rolling mills is 0.7-1%, and the mass percentage of dioctadecyl thiodipropionate in the high-viscosity oil-gas lubricating oil composition for cold rolling mills is 0.8-1.5%. This preferred combination of antioxidants, through compounding, can give the oil-gas lubricating oil composition good antioxidant effects, can slow down coking of the lubricating oil in the high-temperature environment of cold rolling mill bearings, and has good oil solubility.

[0052] Detergent and dispersant help slow down the formation and accumulation of carbonaceous or gum substances in the oil-gas lubrication system. They can disperse insoluble substances generated by the oxidation of lubricating oil within the lubricating oil bulk through acid neutralization and solubilization. Further, the detergent and dispersant is one or more of polyisobutylene monosuccinimide, polyisobutylene bissuccinimide, succinimide, synthetic calcium sulfonate, polyetheramine, alkyl salicylate calcium, synthetic magnesium sulfonate, and alkylphenol calcium sulfide. Preferably, the detergent and dispersant is a combination of synthetic magnesium sulfonate and alkylphenol calcium sulfide, wherein the mass percentage of synthetic magnesium sulfonate in the high-viscosity oil-gas lubricating oil composition for cold rolling mills is 1-1.5%, and the mass percentage of alkylphenol calcium sulfide in the high-viscosity oil-gas lubricating oil composition for cold rolling mills is 1-1.5%. The selected combination of detergents and dispersants has low ash content and high antioxidant and detergent-dispersing effects, which ensures that the coking produced by the oil-gas lubricating oil can be dispersed and flowed in a timely manner, preventing coking from damaging the oil-gas lubrication system in the cold rolling mill.

[0053] Adding a metal deactivator, used in conjunction with an antioxidant, can further slow down oil oxidation and prevent metal corrosion in bearings. Further, the metal deactivator is one or more of a thiadiazole derivative, a benzotriazole derivative, benzotriazole, methylbenzotriazole, and sodium methylbenzotriazole. Preferably, the metal deactivator is benzotriazole. The preferred metal deactivator has a strong metal deactivation effect, helps to slow down coking of lubricating oil in the high-temperature environment of cold rolling mill bearings, and possesses good oil solubility.

[0054] This application also provides a method for preparing the high-viscosity oil-gas lubricating oil composition for cold rolling mills as described above, comprising the following steps:

[0055] The base oils are mixed to obtain a base oil mixture, which is then stirred at 60-65°C until clear and transparent;

[0056] A viscosity index improver, an oiliness agent, an extreme pressure agent, an antioxidant, a metal deactivator, and a detergent-dispersant are added slowly in sequence to a base oil mixture and stirred until the solution is clear and transparent to obtain a high-viscosity oil-gas lubricating oil composition for cold rolling mills.

[0057] The additives are slowly and sequentially added to the base oil mixture at a certain temperature. Some of the solid additives or high-viscosity liquid additives can be dispersed in the oil-gas lubricating oil composition more quickly and evenly, without the precipitation of functional components, ensuring the stable lubrication and anti-coking performance of the oil-gas lubricating oil composition during use.

[0058] The following specific examples provide further details.

[0059] In various embodiments of this application, some of the raw materials are sourced as follows:

[0060] Polyalphaolefin synthetic oil PAO-100: Kunlun Lubrication;

[0061] Group II base oil 500N: Sinopec Maoming Petrochemical Company;

[0062] Polyisobutylene-1300: DAELIM;

[0063] Trimethylolpropane oleate: Pemex;

[0064] Diisooctyl phosphate: Shanghai Hongze Chemical Co., Ltd.;

[0065] Sulfated fatty acid esters: Shenzhen Simin Industrial Co., Ltd.;

[0066] Hydrocarbon sulfides: EPOIL;

[0067] 2,6-Di-tert-butyl-p-cresol: LANXESS;

[0068] N,N-Diethylhydroxylamine: Junyan New Materials Technology (Shanghai) Co., Ltd.;

[0069] Arkema;

[0070] Synthetic magnesium sulfonate: Chemtura;

[0071] Alkylphenol calcium sulfide: Chemtura;

[0072] Benzotriazole: Jiangyin Yinlin Chemical Co., Ltd.

[0073] Example 1

[0074] The high-viscosity oil-gas lubricating oil composition for cold rolling mills in Example 1 comprises the following components by mass percentage: 67% base oil, 7% viscosity index improver, 12% extreme pressure agent, 6% oiliness agent, 3% antioxidant, 3% detergent-dispersant and 2% metal deactivator.

[0075] The base oil is a combination of polyalphaolefin synthetic oil PAO-100 and Group II base oil 500N, with a mass percentage of 26:41. The viscosity index improver is polyisobutylene-1300. The oiliness agent is trimethylolpropane oleate. The extreme pressure agent is a combination of diisooctyl phosphate, sulfurized fatty acid esters, and hydrocarbon sulfides, with a mass percentage of [missing information]. The ratio of the components is 4:6:2; the antioxidant is a combination of 2,6-di-tert-butyl-p-cresol, N,N-diethylhydroxylamine, and dioctadecyl thiodipropionate, with a mass percentage of 0.5:1:1.5; the detergent-dispersant is a combination of synthetic magnesium sulfonate and calcium alkylphenol sulfide, with a mass percentage of 1.5:1.5; and the metal deactivator is benzotriazole.

[0076] The method for preparing the high-viscosity oil-gas lubricating oil composition for cold rolling mills in Example 1 includes the following steps:

[0077] The base oils are mixed to obtain a base oil mixture, which is then stirred at 65°C until clear and transparent;

[0078] The viscosity index improver, oiliness agent, extreme pressure agent, antioxidant, metal deactivator and detergent-dispersant were added slowly in sequence to the base oil mixture and stirred until the solution was clear and transparent to obtain the high viscosity oil-gas lubricating oil composition for cold rolling mills in Example 1.

[0079] Example 2

[0080] The high-viscosity oil-gas lubricating oil composition for cold rolling mills in Example 2 comprises the following components by mass percentage: 71% base oil, 6% viscosity index improver, 11% extreme pressure agent, 5% oiliness agent, 3% antioxidant, 2% detergent-dispersant and 2% metal deactivator.

[0081] The base oil is a combination of polyalphaolefin synthetic oil PAO-100 and Group II base oil 500N, with a mass percentage ratio of 28:45. The viscosity index improver is polyisobutylene-1300. The oiliness agent is trimethylolpropane oleate. The extreme pressure agent is a combination of diisooctyl phosphate, sulfurized fatty acid esters, and hydrocarbon sulfides, with a mass percentage ratio of 28:45. The ratio of the components is 4:6:1; the antioxidant is a combination of 2,6-di-tert-butyl-p-cresol, N,N-diethylhydroxylamine and dioctadecyl thiodipropionate, with a mass percentage of 0.7:1:1.3; the detergent-dispersant is a combination of synthetic magnesium sulfonate and calcium alkylphenol sulfide, with a mass percentage of 1:1; the metal deactivator is benzotriazole.

[0082] Example 2 was prepared using the same preparation method as Example 1, resulting in a high-viscosity oil-gas lubricating oil composition for use in a cold rolling mill.

[0083] Example 3

[0084] The high-viscosity oil-gas lubricating oil composition for cold rolling mills in Example 3 comprises the following components by mass percentage: 76% base oil, 5% viscosity index improver, 10% extreme pressure agent, 4% oiliness agent, 2% antioxidant, 2% detergent-dispersant and 1% metal deactivator.

[0085] The base oil is a combination of polyalphaolefin synthetic oil PAO-100 and Group II base oil 500N, with a mass percentage of 31:45. The viscosity index improver is polyisobutylene-1300. The oiliness agent is trimethylolpropane oleate. The extreme pressure agent is a combination of diisooctyl phosphate, sulfurized fatty acid esters, and hydrocarbon sulfides, with a mass percentage of 31:45. The ratio is 3:5:2; the antioxidant is a combination of 2,6-di-tert-butyl-p-cresol, N,N-diethylhydroxylamine, and dioctadecyl thiodipropionate, with a mass percentage of 0.5:0.7:0.8; the detergent-dispersant is a combination of synthetic magnesium sulfonate and calcium alkylphenol sulfide, with a mass percentage of 1:1; the metal deactivator is benzotriazole.

[0086] Example 3 was prepared using the same preparation method as Example 1, resulting in the high-viscosity oil-gas lubricating oil composition for use in cold rolling mills.

[0087] Comparative Example

[0088] Commercially available imported oil-based lubricating oil: QUINTOLUBRIC.

[0089] The high-viscosity oil-gas lubricating oil compositions for cold rolling mills in various embodiments of this application, and the lubrication performance test methods for comparative oil-gas lubricating oils are as follows:

[0090] (1) Test method for extreme pressure properties of oil-gas lubricating oil composition: Refer to GB / T12583-1998, and test the maximum non-seize load (P). B ) and sintering point (P D Test instrument model: Xiamen Tianji MS-10A.

[0091] (2) Method for testing the kinematic viscosity and calculating the viscosity index of oil-gas lubricating oil compositions: Refer to GB / T 265-1988. Test instrument model: Dalian Beifang BF-03F.

[0092] (3) Test method for antioxidant properties of oil-gas lubricating oil composition: Refer to SH / T0193-2008 to test oxidation time. Test instrument model: Jinshi JSH0101.

[0093] (4) Test method for copper strip corrosion performance of oil-gas lubricating oil composition: Refer to GB / T5096-2017.

[0094] (5) Test method for corrosion performance of cast iron sheets of oil-gas lubricating oil composition: Refer to GB / T6144-2010.

[0095] The test results are shown in Table 1:

[0096] Table 1

[0097] Test object <![CDATA[P B ,kg]]> <![CDATA[P D ,kg]]> <![CDATA[40℃ kinematic viscosity (mm 2 / s)]]> <![CDATA[Kinematic viscosity at 100 °C (mm 2 / s)]]> Viscosity Index Oxidation time (min) Copper sheet corrosion level Corrosion rating of cast iron sheets Example 1 132 500 433.7 39.27 142 110 1B A Example 2 132 500 429.5 38.21 134 112 1B A Example 3 139 500 439.8 39.64 137 109 1B A Comparative Example 126 315 427.6 37.68 133 92 3A A

[0098] In the corrosion performance test of cast iron sheets according to GB / T6144-2010, the corrosion grade of the cast iron sheets in Examples 1-3 and the comparative example was A (indicating that the cast iron sheets were rust-free and had a new luster). In the corrosion performance test of copper sheets according to GB / T5096-2017, compared with the copper sheet corrosion standard color chart, the copper sheet corrosion grade of Examples 1-3 was 1B (indicating slight discoloration, the copper sheet was dark orange), while the copper sheet corrosion grade of the comparative example was 3A (indicating deep discoloration, the copper sheet showed a magenta color covering the brass color). This indicates that the oil-air lubricating oil composition of Examples 1-3 had a much lower corrosion degree on copper sheets than the comparative example, and can ensure that copper parts such as copper bushings in bearings are not easily corroded during application.

[0099] The oil-gas lubricating oil composition in the examples has a similar kinematic viscosity at 40°C to the commercially available imported oil-gas lubricating oil in the comparative examples, but the examples have a higher viscosity index and stronger lubricating film retention at high temperatures; the maximum non-seize load (P) of the examples is also higher. B ) and sintering point (P D The oxidation time in this embodiment is longer, and the combined action of antioxidants, detergents, dispersants, and metal deactivators can slow down the formation and accumulation of carbonaceous material or gum in the oil-gas lubrication system at high temperatures. It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of this application.

Claims

1. A high viscosity oil gas lubricating oil composition for cold rolling mills, characterized in that, Calculated by mass percentage, it includes the following components: Base oil 67-76%; the base oil is a combination of polyalphaolefin synthetic oil PAO-100 and Group II base oil 500N; Viscosity index improver 5-7%; the viscosity index improver is polyisobutylene-1300; Extreme pressure agent 10-12%; the extreme pressure agent is a combination of diisooctyl phosphate, sulfurized fatty acid ester and hydrocarbon sulfide; Oiliness agent 4-6%; the oiliness agent is trimethylolpropane oleate; Antioxidant 2-3%; the antioxidant is a combination of 2,6-di-tert-butyl-p-cresol, N,N-diethylhydroxylamine and dioctadecyl thiodipropionate; 1-2% of a metal deactivator; the metal deactivator is benzotriazole; 2-3% detergent-dispersant; the detergent-dispersant is a combination of synthetic magnesium sulfonate and calcium alkylphenol sulfide.

2. The high viscosity oil gas lubricating oil composition for cold rolling mill according to claim 1, characterized by, The polyalphaolefin synthetic oil PAO-100 accounts for 26-31% by mass in the high viscosity oil-gas lubricant composition for cold rolling mills, and the Group II base oil 500N accounts for 41-45% by mass in the high viscosity oil-gas lubricant composition for cold rolling mills.

3. The high viscosity oil gas lubricating oil composition for cold rolling mill according to claim 1, characterized by, The diisooctyl phosphate comprises 3-4% by mass of the high-viscosity oil-gas lubricating oil composition for cold rolling mills, the sulfurized fatty acid ester comprises 5-6% by mass of the high-viscosity oil-gas lubricating oil composition for cold rolling mills, and the hydrocarbon sulfide comprises 1-2% by mass of the high-viscosity oil-gas lubricating oil composition for cold rolling mills.

4. The high-viscosity oil-gas lubricating oil composition for cold rolling mills according to claim 1, characterized in that, The 2,6-di-tert-butyl-p-cresol comprises 0.5-0.7% by mass in the high-viscosity oil-gas lubricant composition for cold rolling mills, the N,N-diethylhydroxylamine comprises 0.7-1% by mass in the high-viscosity oil-gas lubricant composition for cold rolling mills, and the dioctadecyl thiodipropionate comprises 0.8-1.5% by mass in the high-viscosity oil-gas lubricant composition for cold rolling mills.

5. The high-viscosity oil-gas lubricating oil composition for cold rolling mills according to claim 1, characterized in that, The synthetic magnesium sulfonate comprises 1-1.5% by mass in the high viscosity oil-gas lubricating oil composition for cold rolling mills, and the sulfidated alkylphenol calcium comprises 1-1.5% by mass in the high viscosity oil-gas lubricating oil composition for cold rolling mills.

6. A method for preparing a high-viscosity oil-gas lubricating oil composition for a cold rolling mill as described in any one of claims 1-5, characterized in that, Includes the following steps: The base oils are mixed to obtain a base oil mixture, which is then stirred at 60-65°C until clear and transparent; A viscosity index improver, an oiliness agent, an extreme pressure agent, an antioxidant, a metal deactivator, and a detergent-dispersant are added slowly in sequence to the base oil mixture, and the mixture is stirred until the solution is clear and transparent to obtain a high viscosity oil-gas lubricating oil composition for cold rolling mills.