Open gear lubricating oil for double-inlet and double-outlet steel ball coal mill and preparation method of open gear lubricating oil

Abstract

The invention belongs to the technical field of lubricating oil, and particularly relates to double-inlet and double-outlet steel ball coal mill exposed gear lubricating oil and a preparation method thereof. The lubricating oil comprises the following components in parts by weight: 65.95 to 83.49 parts of poly-alpha olefin base oil; 5 to 15 parts of synthetic ester base oil; 1-3 parts of an oxidation and corrosion inhibitor; 6-8 parts of an anti-wear reagent at extreme pressure; 1-2 parts of a friction modifier; 0.5 to 1 part of an antirust agent; 0.01 to 0.05 part of a metal deactivator; 3 to 5 parts of colloidal graphite; the oxidation and corrosion inhibitor is a mixture of dialkyl dithiophosphate and dialkyl dithiocarbamate, and the mixing mass ratio of the dialkyl dithiophosphate to the dialkyl dithiocarbamate is (1-2): 1; the extreme pressure anti-wear agent is a mixture of tertiary alkyl polysulfide and sulfurized isobutylene according to the mixing mass ratio of (1-3): 1; the friction modifier is molybdenum dialkyl dithiophosphate; the antirust agent is neutral dinonyl naphthalene sulfonic acid barium salt; the metal deactivator is a thiadiazole derivative. The lubricating oil has extremely high bearing capacity and good anti-friction and anti-wear performance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of lubricating oil, and particularly relates to a double-in double-out steel ball mill open gear lubricating oil and a preparation method. BACKGROUND

[0002] Open gear is the most common power transmission way in manufacturing industry, and is widely applied to large-scale equipment in power, cement, mine, papermaking and other industries, such as rotary kiln, ball mill, rod mill, coal mill, drying machine, granulator, mixer and the like. The large load of large-scale open gear transmission device determines that its efficient and safe operation depends on not only the design of the gear and the material of the gear, but also correct assembly, efficient lubrication maintenance and high-quality lubricant. According to statistics, about 20% of the damage of open gear is caused by poor lubrication or lubrication failure. Therefore, effective lubrication of open gear is very important. The open gear is in a heavy load and continuous operation working state for a long time, and the working environment is relatively poor. The open gear is often in a working condition of large load or impact load. The working condition of the open gear lubricant is mostly in an environment with much dust and impurities, and the external medium can easily pollute the meshing surface of the open gear. The above factors bring adverse effects on the lubrication of the open gear, and put forward higher requirements for the open gear lubricant.

[0003] At present, the open gear lubricants commonly used by domestic manufacturing enterprises mainly include asphalt type, asphalt solvent type open gear lubricating oil / grease, refined mineral oil type open gear lubricating oil, semi-fluid open gear lubricating grease and synthetic open gear oil. The open gear lubricant containing asphalt usually contains a certain amount of volatile solvent, which can seriously affect the equipment operators and the surrounding environment, and thus its use is being more and more limited. The power and energy consumption of the mainstream open gear lubricating grease on the market has been greatly improved compared with the initial asphalt lubricant, but there is still much room for improvement. The open gear lubricating grease on the market is mostly in the form of semi-fluid grease. The product is refined by using high-viscosity base oil, solid lubricants such as molybdenum disulfide, graphite and calcium carbonate and extreme pressure and wear-resistant additives, and can maintain moderate consistency in a wide temperature range, has excellent adhesion and good rust prevention ability. Due to the presence of a large amount of solid lubricants, the product is prone to sedimentation and nozzle blockage, resulting in poor lubrication and poor application effect. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a double-in double-out steel ball mill open gear lubricating oil, which has excellent adhesion, extremely high load capacity, good friction reduction and wear resistance, and excellent environmental friendliness.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A lubricating oil for an open gear of a double-inlet, double-outlet ball mill, comprising, by weight:

[0007] Polyalphaolefin base oil: 65.95–83.49 parts;

[0008] Synthetic ester base oil: 5-15 parts;

[0009] Antioxidant and preservative agent: 1-3 parts;

[0010] Extreme pressure anti-wear agent: 6-8 parts;

[0011] Friction modifier: 1-2 parts;

[0012] Rust inhibitor: 0.5 to 1 part;

[0013] Metal deactivating agent: 0.01–0.05 parts;

[0014] Colloidal graphite: 3-5 parts;

[0015] The antioxidant and anticorrosive agent is a mixture of dialkyl dithiophosphate and dialkyl dithiocarbamate, with a mixing mass ratio of (1-2):1;

[0016] The extreme pressure anti-wear agent is a mixture of tertiary alkyl polysulfides and isobutylene sulfide, with a mixing mass ratio of (1-3):1;

[0017] The friction modifier is molybdenum dialkyl dithiophosphate;

[0018] The rust inhibitor is neutral dinonylnaphthalenesulfonate;

[0019] The metal deactivator is a thiadiazole derivative.

[0020] The polyalphaolefin base oil has a kinematic viscosity of 65,000–75,000 mmHg at 40°C. 2 / s; viscosity index ≥150.

[0021] The synthetic ester base oil is trimethylolpropane oleate base oil with a kinematic viscosity of 46–68 mm at 40°C. 2 / s, viscosity index ≥180, pour point ≤-36℃.

[0022] The dialkyl dithiophosphate has a flash point ≥180℃, a sulfur content of 14-18%, a phosphorus content of 7.5-8.8%, and a zinc content of 9.0-10.5%.

[0023] The dialkyl dithiocarbamate has a kinematic viscosity of 13.5–15.5 mm at 100°C. 2 / s, flash point ≥170℃, sulfur content 29~32%.

[0024] The tertiary alkyl polysulfides are dialkyl trisulfides with a closed-cup flash point ≥121℃ and a sulfur content of 20-23%.

[0025] The sulfurized isobutylene has a closed-cup flash point ≥100℃ and a kinematic viscosity of 5.5~8.0 mm at 100℃. 2 / s, sulfur content 40-46%.

[0026] The colloidal graphite has a particle size ≤1.5μm, purity >99.00%, ash content ≤1.0%, moisture content ≤0.5%, and pH value of 6-7.

[0027] A method for preparing a lubricating oil for an open gear of a double-inlet, double-outlet ball mill coal mill involves first heating a polyalphaolefin base oil to 60℃-70℃ in an insulated chamber, then heating a mixing vessel to 100℃-110℃. Next, synthetic ester base oil and polyalphaolefin base oil are added to the mixing vessel along with dialkyl dithiophosphate, dialkyl dithiocarbamate, and colloidal graphite. The base oil and additives are mixed and heated using a double-ribbon agitator, with the temperature raised to 80℃-90℃ and stirred for 60-90 minutes. The mixing vessel temperature is then lowered to 60℃-70℃, and tert-alkyl polysulfides and isobutylene sulfide are added and stirred for 30-60 minutes. Dialkyl dithiophosphate molybdenum is then added and stirred for 30-60 minutes. Finally, neutral dinonylnaphthalenesulfonate barium and thiadiazole derivatives are added and stirred for 30-60 minutes. The mixture is then inspected and packaged.

[0028] Compared with existing technologies, the beneficial effects of this invention are:

[0029] 1. It uses base oil components with excellent low-temperature performance, viscosity-temperature performance and lubricity to synthesize ester (trimethylolpropane oleate) base oil; this gives the lubricating oil a wider operating temperature range and good pumping performance for open gear lubrication systems in coal mills with low ambient temperatures; at the same time, it has a synergistic effect with extreme pressure anti-wear additives.

[0030] 2. The synergistic effect of colloidal graphite and extreme pressure anti-wear agent (a compound of tertiary alkyl polysulfides and isobutylene sulfide) can provide good extreme pressure anti-wear performance under different loads, effectively extending the service life of open gears.

[0031] Colloidal graphite, utilizing its layered crystal structure and low-shear properties, forms a physical insulating film on metal friction surfaces. This film replaces direct metal-to-metal friction with "interlayer sliding," thereby reducing the coefficient of friction and wear. Its colloidal morphology ensures uniform dispersion of graphite particles in the oil, preventing agglomeration and sedimentation, and guaranteeing the continuity and effectiveness of the lubricating film. Graphite lubricating films are resistant to high temperatures and pressures and exhibit strong chemical stability. Even under high-temperature, heavy-load, or boundary lubrication conditions where lubricating oils are prone to failure, they maintain stable lubrication performance, overcoming the performance limitations of traditional oil-based agents and extreme-pressure agents.

[0032] The sulfur content of tertiary alkyl polysulfides is 20%–23%, while that of isobutylene sulfide is 40%–46%. The sulfur content and sulfur activity of tertiary alkyl polysulfides and isobutylene sulfide are different, thus they have good synergistic effects under different working conditions.

[0033] The open gear operation of a double-inlet, double-outlet ball mill typically ranges from 60℃ to 90℃. Under medium-to-low load conditions below 80℃, the friction pairs are effectively isolated first by the oil film and colloidal graphite. Simultaneously, the adsorption of tertiary alkyl polysulfides and isobutylene sulfide effectively prevents scratches. The polar groups (sulfur-containing parts) in the molecular structure of tertiary alkyl polysulfides and isobutylene sulfide combine with active sites on the metal surface to form a physical adsorption film, reducing direct friction between the friction surfaces. Below 70℃, both the sulfur content of the tertiary alkyl polysulfides and isobutylene sulfide play a role. Above 70℃, isobutylene sulfide, with its higher sulfur content, takes precedence.

[0034] Under high load and high speed conditions above 80℃, the friction pairs are first effectively isolated by an oil film and colloidal graphite. Simultaneously, the chemical reaction of tertiary alkyl polysulfides and isobutylene sulfide effectively prevents scuffing. When the friction surface temperature rises (high load, high speed), the molecules of tertiary alkyl polysulfides and isobutylene sulfide decompose, releasing sulfur which reacts chemically with metals (such as iron) to form sulfides such as FeS and FeS2. These sulfide films have high melting points and low shear strength, effectively isolating the rubbing metal surfaces and preventing seizing or severe wear.

[0035] 3. It is formulated with dialkyl dithiophosphate and dialkyl dithiocarbamate, which have excellent antioxidant, anti-corrosion and anti-wear properties.

[0036] 4. The lubricating oil has high viscosity and viscosity index. The viscosity of the oil does not change significantly with temperature. Even at high temperatures, it still has high viscosity and excellent adhesion.

[0037] 5. Lubricating oil sintering load P D The value and comprehensive wear index are relatively high, and the sintering load P is relatively high. DThe value indicates strong resistance to impact loads; a high comprehensive wear index indicates strong comprehensive wear resistance, strong wear resistance under different loads, and strong load-bearing capacity.

[0038] 6. Adding antioxidants and corrosion inhibitors during the preparation process can effectively inhibit the oxidation of extreme pressure anti-wear agents and friction modifiers, thus preventing a decline in the performance of the additives. Detailed Implementation

[0039] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0040] A lubricating oil for an open gear of a double-inlet, double-outlet ball mill, comprising, by weight:

[0041] Polyalphaolefin base oil: 65.95–83.49 parts;

[0042] Synthetic ester base oil: 5-15 parts;

[0043] Antioxidant and preservative agent: 1-3 parts;

[0044] Extreme pressure anti-wear agent: 6-8 parts;

[0045] Friction modifier: 1-2 parts;

[0046] Rust inhibitor: 0.5 to 1 part;

[0047] Metal deactivating agent: 0.01–0.05 parts;

[0048] Colloidal graphite: 3-5 parts;

[0049] The antioxidant and anticorrosive agent is a mixture of dialkyl dithiophosphate and dialkyl dithiocarbamate, with a mixing mass ratio of (1-2):1;

[0050] The extreme pressure anti-wear agent is a mixture of tertiary alkyl polysulfides and isobutylene sulfide, with a mixing mass ratio of (1-3):1;

[0051] The friction modifier is molybdenum dialkyl dithiophosphate;

[0052] The rust inhibitor is neutral dinonylnaphthalenesulfonate;

[0053] The metal deactivator is a thiadiazole derivative.

[0054] The polyalphaolefin base oil has a kinematic viscosity of 65,000–75,000 mmHg at 40°C. 2 / s; viscosity index ≥150.

[0055] The synthetic ester base oil is trimethylolpropane oleate base oil with a kinematic viscosity of 46–68 mm at 40°C. 2 / s, viscosity index ≥180, pour point ≤-36℃.

[0056] The dialkyl dithiophosphate (bisoctyl ZDDP) has a flash point ≥180℃, a sulfur content of 14-18%, a phosphorus content of 7.5-8.8%, and a zinc content of 9.0-10.5%.

[0057] The dialkyl dithiocarbamate (aminothioester) has a kinematic viscosity of 13.5–15.5 mm at 100°C. 2 / s, flash point ≥170℃, sulfur content 29~32%.

[0058] The tertiary alkyl polysulfides are dialkyl trisulfides with a closed-cup flash point ≥121℃ and a sulfur content of 20-23%.

[0059] The sulfurized isobutylene has a closed-cup flash point ≥100℃ and a kinematic viscosity of 5.5~8.0 mm at 100℃. 2 / s, sulfur content 40-46%.

[0060] The colloidal graphite has a particle size ≤1.5μm (>90%), purity >99.00%, ash content ≤1.0%, moisture content ≤0.5%, and pH value 6-7.

[0061] A method for preparing a lubricating oil for an open gear of a double-inlet, double-outlet ball mill coal mill involves first heating a polyalphaolefin base oil to 60℃-70℃ in an insulated chamber, then heating a mixing vessel to 100℃-110℃. Trimethylolpropane oleate base oil and the polyalphaolefin base oil are then added to the mixing vessel along with dialkyl dithiophosphate, dialkyl dithiocarbamate, and colloidal graphite. The base oil and additives are mixed and heated using a double-ribbon agitator, with the temperature raised to 80℃-90℃ and stirred for 60-90 minutes. The temperature of the mixing vessel is then lowered to 60℃-70℃, and tert-alkyl polysulfides and isobutylene sulfide are added and stirred for 30-60 minutes. Dialkyl dithiophosphate molybdenum is then added and stirred for 30-60 minutes. Neutral dinonylnaphthalenesulfonate barium and thiadiazole derivatives are then added and stirred for 30-60 minutes. Finally, the mixture is inspected and packaged.

[0062] The technical specifications of the lubricating oil for the open gear of the double-inlet, double-outlet ball mill are shown in Table 1:

[0063] Table 1 Technical Specifications of Lubricating Oil for Open Gear Mills with Double Inlet and Double Outlet Ball Mills

[0064]

[0065] To make the objectives, technical solutions, and technical effects of this invention clearer, the technical solutions in the embodiments of this invention are now described clearly and completely. However, the embodiments described below are only some embodiments of this invention, not all embodiments. All other embodiments obtained by those skilled in the art in conjunction with the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0066] Example 1

[0067] A lubricating oil for open gears in a double-inlet, double-outlet ball mill, comprising the following components in weight proportions:

[0068] Polyalphaolefin base oil: 67.95 parts; kinematic viscosity at 40°C: 65,000–70,000 mm³ 2 / s; viscosity index ≥150.

[0069] Trimethylolpropane oleate base oil: 15 parts; kinematic viscosity at 40°C: 46–55 mm. 2 / s, viscosity index ≥180, pour point ≤-36℃.

[0070] Two parts of dialkyl dithiophosphate; flash point ≥180℃, sulfur content 16-18%, phosphorus content 8.0-8.8%, zinc content 9.5-10.5%.

[0071] 1 part dialkyl dithiocarbamate; kinematic viscosity at 100℃: 14–15.5 mm 2 / s, flash point ≥170℃, sulfur content 29~32%.

[0072] Six parts of tertiary alkyl polysulfides; closed-cup flash point ≥121℃, sulfur content 20-23%.

[0073] Two parts of sulfurized isobutylene; closed-cup flash point ≥100℃, kinematic viscosity at 100℃ 6.5~8.0mm. 2 / s, sulfur content 40-43%.

[0074] Dialkyl dithiophosphate molybdenum: 2 parts.

[0075] Neutral dinonylnaphthalenesulfonate barium: 1 part.

[0076] Thiadiazole derivative: 0.05 parts.

[0077] Colloidal graphite (F-00): 3 parts; particle size ≤ 1.5 μm (percentage > 90%), purity > 99.00%, ash content ≤ 1.0%; moisture content ≤ 0.5%; pH value: 6-7.

[0078] The specific preparation process in this embodiment is as follows:

[0079] The polyalphaolefin base oil was heated to 60℃~70℃ in an insulated chamber, and the blending kettle was heated to 100℃~110℃. Then, all the trimethylolpropane oleate base oil and polyalphaolefin base oil were added to the blending kettle, along with dialkyl dithiophosphate, dialkyl dithiocarbamate, and colloidal graphite (F-00). The base oil and additives were mixed and heated using a twin-ribbon agitator, and the temperature was raised to 80℃~90℃ and stirred for 60~90 minutes. The temperature of the blending kettle was then lowered to 60℃~70℃, and tert-alkyl polysulfides and sulfurized isobutylene were added and stirred for 30~60 minutes. Dialkyl dithiophosphate molybdenum was added and stirred for 30~60 minutes. Neutral dinonylnaphthalenesulfonate barium and thiadiazole derivatives were added and stirred for 30~60 minutes. The mixture was then inspected and packaged.

[0080] Example 2

[0081] A lubricating oil for open gears in a double-inlet, double-outlet ball mill, comprising the following components in weight proportions:

[0082] Polyalphaolefin base oil: 71.62 parts; kinematic viscosity at 40℃: 68,000–72,000 mm³ 2 / s; viscosity index ≥150.

[0083] Trimethylolpropane oleate base oil: 12 parts; kinematic viscosity at 40°C: 50–55 mm. 2 / s, viscosity index ≥180, pour point ≤-36℃.

[0084] One part of dialkyl dithiophosphate; flash point ≥180℃, sulfur content 16-18%, phosphorus content 7.8-8.0%, zinc content 9.2-10.0%.

[0085] 1 part dialkyl dithiocarbamate; kinematic viscosity at 100℃: 13.5–14 mm. 2 / s, flash point ≥170℃, sulfur content 29~32%.

[0086] Four parts of tertiary alkyl polysulfides; closed-cup flash point ≥121℃, sulfur content 20-23%.

[0087] 4 parts of sulfurized isobutylene; closed-cup flash point ≥100℃, kinematic viscosity at 100℃ 6.5~8.0mm. 2 / s, sulfur content 42-45%.

[0088] Dialkyl dithiophosphate molybdenum: 1.6 parts.

[0089] Neutral dinonylnaphthalenesulfonate barium: 0.75 parts.

[0090] Thiadiazole derivative: 0.03 parts.

[0091] Colloidal graphite (F-00): 4 parts; particle size ≤ 1.5 μm (percentage > 90%), purity > 99.00%, ash content ≤ 1.0%; moisture content ≤ 0.5%; pH value: 6-7.

[0092] The specific preparation process in this embodiment is as follows:

[0093] The polyalphaolefin base oil was heated to 60℃~70℃ in an insulated chamber, and the blending kettle was heated to 100℃~110℃. Then, all the trimethylolpropane oleate base oil and polyalphaolefin base oil were added to the blending kettle, along with dialkyl dithiophosphate, dialkyl dithiocarbamate, and colloidal graphite (F-00). The base oil and additives were mixed and heated using a twin-ribbon agitator, and the temperature was raised to 80℃~90℃ and stirred for 60~90 minutes. The temperature of the blending kettle was then lowered to 60℃~70℃, and tert-alkyl polysulfides and sulfurized isobutylene were added and stirred for 30~60 minutes. Dialkyl dithiophosphate molybdenum was added and stirred for 30~60 minutes. Neutral dinonylnaphthalenesulfonate barium and thiadiazole derivatives were added and stirred for 30~60 minutes. The mixture was then inspected and packaged.

[0094] Example 3

[0095] A lubricating oil for open gears in a double-inlet, double-outlet ball mill, comprising the following components in weight proportions:

[0096] Polyalphaolefin base oil: 78.54 parts; kinematic viscosity at 40℃: 70,000–73,000 mm³ 2 / s; viscosity index ≥150.

[0097] Trimethylolpropane oleate base oil: 8 parts; kinematic viscosity at 40°C: 60-65 mm. 2 / s, viscosity index ≥180, pour point ≤-36℃.

[0098] One part of dialkyl dithiophosphate; flash point ≥180℃, sulfur content 16-18%, phosphorus content 8-8.5%, zinc content 9.5-10.2%.

[0099] 0.5 parts of dialkyl dithiocarbamate; kinematic viscosity at 100℃: 14–15 mm. 2 / s, flash point ≥170℃, sulfur content 29~32%.

[0100] Four parts of tertiary alkyl polysulfides; closed-cup flash point ≥121℃, sulfur content 20-23%.

[0101] Two parts of sulfurized isobutylene; closed-cup flash point ≥100℃, kinematic viscosity at 100℃ 6.5~8.0mm. 2 / s, sulfur content 40-44%.

[0102] Dialkyl dithiophosphate molybdenum: 1.2 parts.

[0103] Neutral dinonylnaphthalenesulfonate barium: 0.75 parts.

[0104] Thiadiazole derivative: 0.01 parts.

[0105] Colloidal graphite (F-00): 4 parts; particle size ≤ 1.5 μm (percentage > 90%), purity > 99.00%, ash content ≤ 1.0%; moisture content ≤ 0.5%; pH value: 6-7.

[0106] The specific preparation process in this embodiment is as follows:

[0107] The polyalphaolefin base oil is heated to 60℃~70℃ in an insulated chamber, and the blending kettle is heated to 100℃~110℃. Then, all the trimethylolpropane oleate base oil and polyalphaolefin base oil are added to the blending kettle, along with dialkyl dithiophosphate and dialkyl dithiocarbamate. The base oil and additives are mixed and heated using a twin-ribbon agitator, and the temperature is raised to 80℃~90℃ and stirred for 60~90 minutes. The temperature of the blending kettle is then lowered to 60℃~70℃, and tert-alkyl polysulfides and sulfurized isobutylene are added and stirred for 30~60 minutes. Dialkyl dithiophosphate molybdenum is added and stirred for 30~60 minutes. Neutral dinonylnaphthalenesulfonate barium and thiadiazole derivatives are added and stirred for 30~60 minutes. The mixture is then inspected and packaged.

[0108] Example 4

[0109] A lubricating oil for open gears in a double-inlet, double-outlet ball mill, comprising the following components in weight proportions:

[0110] Polyalphaolefin base oil: 82.5 parts; kinematic viscosity at 40°C: 71,000–75,000 mm³ 2 / s; viscosity index ≥150.

[0111] Trimethylolpropane oleate base oil: 5 parts; kinematic viscosity at 40°C: 55-60 mmHg 2 / s, viscosity index ≥180, pour point ≤-36℃.

[0112] 0.5 parts of dialkyl dithiophosphate; flash point ≥180℃, sulfur content 16-18%, phosphorus content 7.8-8.0%, zinc content 9.5-10.1%.

[0113] 0.5 parts of dialkyl dithiocarbamate; kinematic viscosity at 100℃: 13.8–14.3 mm. 2 / s, flash point ≥170℃, sulfur content 29~32%.

[0114] Three parts of tertiary alkyl polysulfides; closed-cup flash point ≥121℃, sulfur content 20-23%.

[0115] 3 parts of sulfurized isobutylene; closed-cup flash point ≥100℃, kinematic viscosity at 100℃ 7~8.0mm 2 / s, sulfur content 42-46%.

[0116] Dialkyl dithiophosphate molybdenum: 1 part.

[0117] Neutral dinonylnaphthalenesulfonate barium: 0.5 parts.

[0118] Thiadiazole derivative: 0.01 parts.

[0119] Colloidal graphite (F-00): 3.5 parts; particle size ≤ 1.5 μm (percentage > 90%), purity > 99.00%, ash content ≤ 1.0%; moisture content ≤ 0.5%; pH value: 6-7.

[0120] The specific preparation process in this embodiment is as follows:

[0121] The polyalphaolefin base oil was heated to 60℃~70℃ in an insulated chamber, and the blending kettle was heated to 100℃~110℃. Then, all the trimethylolpropane oleate base oil and polyalphaolefin base oil were added to the blending kettle, along with dialkyl dithiophosphate, dialkyl dithiocarbamate, and colloidal graphite (F-00). The base oil and additives were mixed and heated using a twin-ribbon agitator, and the temperature was raised to 80℃~90℃ and stirred for 60~90 minutes. The temperature of the blending kettle was then lowered to 60℃~70℃, and tert-alkyl polysulfides and sulfurized isobutylene were added and stirred for 30~60 minutes. Dialkyl dithiophosphate molybdenum was added and stirred for 30~60 minutes. Neutral dinonylnaphthalenesulfonate barium and thiadiazole derivatives were added and stirred for 30~60 minutes. The mixture was then inspected and packaged.

[0122] The product performance test results for the example are shown in Table 2:

[0123] Table 2. Test results of the lubricating oils prepared in Examples 1-4

[0124]

[0125] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lubricating oil for an open gear of a double-inlet, double-outlet ball mill, characterized in that, The components, by weight, include: Polyalphaolefin base oil: 65.95–83.49 parts; Synthetic ester base oil: 5-15 parts; Antioxidant and preservative agent: 1-3 parts; Extreme pressure anti-wear agent: 6-8 parts; Friction modifier: 1-2 parts; Rust inhibitor: 0.5 to 1 part; Metal deactivating agent: 0.01–0.05 parts; Colloidal graphite: 3-5 parts; The antioxidant and anticorrosive agent is a mixture of dialkyl dithiophosphate and dialkyl dithiocarbamate, with a mixing mass ratio of (1-2):1; The extreme pressure anti-wear agent is a mixture of tertiary alkyl polysulfides and isobutylene sulfide, with a mixing mass ratio of (1-3):1; The friction modifier is molybdenum dialkyl dithiophosphate; The rust inhibitor is neutral dinonylnaphthalenesulfonate; The metal deactivator is a thiadiazole derivative.

2. The open gear lubricating oil for a double-inlet, double-outlet ball mill according to claim 1, characterized in that, The polyalphaolefin base oil has a kinematic viscosity of 65,000–75,000 mmHg at 40°C. 2 / s; viscosity index ≥150.

3. The open gear lubricating oil for a double-inlet, double-outlet ball mill according to claim 1, characterized in that, The synthetic ester base oil is trimethylolpropane oleate base oil with a kinematic viscosity of 46–68 mm at 40°C. 2 / s, viscosity index ≥180, pour point ≤-36℃.

4. The open gear lubricating oil for a double-inlet, double-outlet ball mill according to claim 1, characterized in that, The dialkyl dithiophosphate has a flash point ≥180℃, a sulfur content of 14-18%, a phosphorus content of 7.5-8.8%, and a zinc content of 9.0-10.5%.

5. The open gear lubricating oil for a double-inlet, double-outlet ball mill according to claim 1, characterized in that, The dialkyl dithiocarbamate has a kinematic viscosity of 13.5–15.5 mm at 100°C. 2 / s, flash point ≥170℃, sulfur content 29~32%.

6. The open gear lubricating oil for a double-inlet, double-outlet ball mill according to claim 1, characterized in that, The tertiary alkyl polysulfides are dialkyl trisulfides with a closed-cup flash point ≥121℃ and a sulfur content of 20-23%.

7. The lubricating oil for a double-inlet, double-outlet ball mill open gear according to claim 1, characterized in that, The sulfurized isobutylene has a closed-cup flash point ≥100℃ and a kinematic viscosity of 5.5~8.0 mm at 100℃. 2 / s, sulfur content 40-46%.

8. The open gear lubricating oil for a double-inlet, double-outlet ball mill according to claim 1, characterized in that, The colloidal graphite has a particle size ≤1.5μm, purity >99.00%, ash content ≤1.0%, and moisture content ≤0.5%. pH value: 6-7.

9. The method for preparing a lubricating oil for a double-inlet, double-outlet ball mill open gear according to claim 1, characterized in that, First, heat the polyalphaolefin base oil to 60℃~70℃ in a heat preservation chamber, and heat the blending kettle to 100℃~110℃. Then, add all the synthetic ester base oil and polyalphaolefin base oil to the blending kettle, along with dialkyl dithiophosphate, dialkyl dithiocarbamate, and colloidal graphite. Use a twin-ribbon stirrer to mix and heat the base oil and additives, raising the temperature to 80℃~90℃ and stirring for 60~90 minutes. Then, lower the temperature of the blending kettle to 60℃~70℃, add tertiary alkyl polysulfides and sulfurized isobutylene, and stir for 30~60 minutes. Add molybdenum dialkyl dithiophosphate and stir for 30~60 minutes. Add neutral barium dinonylnaphthalenesulfonate and thiadiazole derivatives and stir for 30~60 minutes. Then, test and package the product.

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