High-oxidation-resistance and anti-coking high-temperature chain lubricant and preparation method thereof

Abstract

This invention discloses a high-antioxidant, anti-coking high-temperature chain lubricant and its preparation method, belonging to the field of chain lubricant preparation technology. It comprises the following components by mass percentage: 70%-85% base oil, 5%-10% antioxidant, 3%-8% anti-coking agent, 1%-3% extreme pressure anti-wear agent, 0.1%-0.5% pour point depressant, 0.01%-0.05% antifoaming agent, and the remainder being unavoidable impurities. The base oil is a mixture of synthetic hydrocarbon oil and polyether oil. This invention prepares the antioxidant complex by rationally selecting a complex of hindered phenolic and amine antioxidants and precisely controlling their ratio under specific temperature and stirring conditions. In accelerated oxidation tests, the increase in acid value after prolonged high-temperature oxidation is minimal, effectively delaying the oxidative deterioration process of the lubricant, significantly extending its service life under high-temperature environments, reducing equipment downtime due to lubricant oxidation failure, and improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of chain lubricant preparation technology, and in particular to a high-temperature chain lubricant with high oxidation resistance and anti-coking properties, and its preparation method. Background Technology

[0002] In the industrial production sector, high-temperature chain equipment is widely used in numerous industries, such as metallurgy, building materials, chemicals, and food processing. During operation, high-temperature chains need to withstand high temperatures, high loads, and complex working conditions, which places extremely stringent requirements on the lubricants used for their lubrication.

[0003] Traditional high-temperature chain lubricants have significant shortcomings in terms of oxidation resistance. Most lubricants use only a single type of antioxidant, such as hindered phenolic antioxidants in some cases. The mechanism of action of a single antioxidant is relatively simple, and it is difficult to comprehensively and effectively inhibit the oxidation reaction of the lubricant in the face of complex high-temperature oxidizing environments. Under high-temperature conditions, the base oil and additives in the lubricant easily react with oxygen, leading to a rapid increase in acid value. This increase in acid value not only accelerates the deterioration of the lubricant itself and shortens its service life, but also corrodes the chain equipment, affecting its normal operation and service life.

[0004] Furthermore, even when some lubricants utilize composite antioxidants, the precise control over the ratio of antioxidants is insufficient, and the preparation process lacks specificity. Different types of antioxidants have different mechanisms of action and activities; only by combining them in appropriate proportions and preparing them under specific temperature and stirring conditions can their synergistic effects be fully realized, achieving optimal antioxidant performance. However, existing preparation methods often overlook these key factors, resulting in lubricants whose antioxidant properties fail to meet the actual requirements of high-temperature chain equipment.

[0005] Finally, during operation, high-temperature chains are exposed to high temperatures for extended periods, causing the lubricant to undergo thermal decomposition and oxidation, producing insoluble deposits. These deposits gradually form hard coking deposits on the chain surface, severely affecting the chain's normal operation. Existing high-temperature chain lubricants are significantly inadequate in preventing coking.

[0006] On the one hand, some lubricants use only a single type of anti-coking agent, such as only metal detergents or ashless dispersants. The scope of action of a single anti-coking agent is limited, and it cannot comprehensively and effectively prevent the formation of coking deposits. Metal detergents mainly prevent corrosion and deposition on metal surfaces by binding with metal ions, but their effect on coking deposits formed from non-metallic impurities is limited; ashless dispersants mainly disperse and suspend impurities, but their ability to remove already formed coking deposits is weak.

[0007] On the other hand, even when lubricants employ composite anti-coking agents, the ratio of metal detergents to ashless dispersants is often not well-chosen, and optimization for the specific operating conditions of high-temperature chains is lacking. Different ratios of composite anti-coking agents exhibit significantly different effects in preventing coking formation and removing existing coking. If the ratio is inappropriate, the synergistic effect of the two anti-coking agents cannot be fully utilized, resulting in poor anti-coking performance of the lubricant. In coking tests simulating high-temperature chain operating conditions, some high-temperature chains using existing lubricants showed significant surface coking, leading to chain jamming, accelerated wear, and increased equipment failure rates and maintenance costs.

[0008] Therefore, we provide a high-temperature chain lubricant with high antioxidant and anti-coking properties and its preparation method. Summary of the Invention

[0009] The purpose of this invention is to solve the problems in the prior art by proposing a high-oxidation, anti-coking high-temperature chain lubricant and its preparation method.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: A high-temperature chain lubricant with high antioxidant and anti-coking properties, comprising the following components by weight percentage: 70%-85% base oil, 5%-10% antioxidant, 3%-8% anti-coking agent, 1%-3% extreme pressure anti-wear agent, 0.1%-0.5% pour point depressant, 0.01%-0.05% antifoaming agent, and balance unavoidable impurities; wherein the base oil is a mixture of synthetic hydrocarbon oil and polyether oil, with synthetic hydrocarbon oil accounting for 60%-80% of the total base oil and polyether oil accounting for 20%-40% of the total base oil; among the unavoidable impurities, the sulfur content is less than 0.005% and the phosphorus content is less than 0.003%.

[0011] Preferably, the antioxidant is a complex of hindered phenolic antioxidants and amine antioxidants, and the mass ratio of hindered phenolic antioxidants to amine antioxidants is 1:1 to 3:1.

[0012] Preferably, the anti-coking agent is a composite of a metal detergent and an ashless dispersant, and the mass ratio of the metal detergent to the ashless dispersant is 1:2-2:1.

[0013] Preferably, the extreme pressure anti-wear agent is a complex of sulfurized olefins and phosphate esters, and the mass ratio of sulfurized olefins to phosphate esters is 2:1-4:1.

[0014] Preferably, the complex of the hindered phenolic antioxidant and the amine antioxidant is prepared by the following steps: T1. Weigh the hindered phenolic antioxidant and amine antioxidant raw materials according to the mass ratio; T2. Place the above raw materials in a reaction vessel and heat to 80℃-100℃ under a nitrogen protective atmosphere; T3. At the above temperature, stir and mix for 1-2 hours to obtain the antioxidant complex.

[0015] Preferably, the composite of the metal detergent and the ashless dispersant is prepared by the following steps: P1. Weigh the metal cleaning agent and ashless dispersant raw materials according to the mass ratio; P2. Add the above ingredients to a high-speed mixer; P3. Stir at a speed of 1000-1500 r / min for 20-30 minutes to obtain the anti-coking agent complex.

[0016] Preferably, a method for preparing a high-oxidation, anti-coking high-temperature chain lubricant is also provided, comprising the following steps: S1. Add synthetic hydrocarbon oil and polyether oil to the mixing tank in proportion; S2. Heat to 50℃-60℃ and stir at a stirring speed of 200-500r / min for 30-60 minutes to ensure that the base oil is fully mixed and homogeneous, thus obtaining a base oil mixture; S3. After the temperature of the base oil mixture stabilizes, add the antioxidant complex, anti-coking complex, and extreme pressure anti-wear complex in sequence. After each additive is added, stir for 15-20 minutes to ensure that the additive is fully dissolved in the base oil. S4. Add pour point depressant and antifoaming agent, and continue stirring for 10-15 minutes; S5. Filter the blended lubricant to remove impurities and undissolved particles, and obtain the final high-oxidation, anti-coking high-temperature chain lubricant.

[0017] Preferably, in step S5, a multi-stage filtration system is used for filtration, with the filtration accuracy increasing step by step, and the final filtration accuracy not less than 5μm, to ensure that there are no visible impurities and particles in the lubricant.

[0018] Preferably, the preparation method further includes a step of quality testing of the lubricant after filtration in step S5. The testing items include viscosity, acid value, flash point, antioxidant properties and anti-coking properties, to ensure that the various performance indicators of the lubricant meet the preset standards.

[0019] Preferably, in the quality inspection step, if the test result does not meet the preset standard, the lubricant is returned to the mixing tank, the amount of additives added is adjusted according to the test result, and the mixing, filtering and testing steps are repeated until all performance indicators meet the preset standard.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By rationally selecting a complex of hindered phenolic and amine antioxidants and precisely controlling their ratio, an antioxidant complex was prepared under specific temperature and stirring conditions. In accelerated oxidation tests, the increase in acid value after prolonged high-temperature oxidation was minimal, effectively delaying the oxidative deterioration process of the lubricant, significantly extending its service life under high-temperature conditions, reducing downtime for equipment maintenance due to lubricant oxidation failure, and improving production efficiency.

[0021] 2. An anti-coking compound is prepared by combining a metal cleaning agent and an ashless dispersant in an appropriate ratio, and then scientifically formulated with other components to create a lubricant. In coking tests simulating high-temperature chain operation, the amount of coking is significantly reduced, effectively preventing the formation of hard coking deposits on the high-temperature chain surface. This avoids problems such as chain jamming and increased wear caused by coking, ensuring normal chain operation, reducing equipment failure rate, and decreasing maintenance costs.

[0022] 3. Synthetic hydrocarbon oils and polyether oils are selected as base oils, and a variety of additives such as antioxidants, anti-coking agents, extreme pressure anti-wear agents, pour point depressants, and anti-foaming agents are rationally combined and manufactured through a precise preparation process. It not only possesses a suitable kinematic viscosity, ensuring the formation of an effective lubricating film on high-temperature chains, but also has a high flash point, enhancing operational safety. Simultaneously, its low acid value helps reduce corrosion of chains and other equipment, comprehensively improving the lubricant's overall performance and providing reliable protection for high-temperature chain equipment. Attached Figure Description

[0023] Figure 1 This is a physical image of the high-oxidation, anti-coking high-temperature chain lubricant of Embodiment 1 of the present invention; Figure 2 This is a physical image of the high-oxidation, anti-coking high-temperature chain lubricant of Comparative Example 1 of the present invention. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] Example 1 Lubricant composition and ratio The high-oxidation, anti-coking high-temperature chain lubricant of this embodiment contains the following components by weight percentage: 75% base oil, 7% antioxidant, 5% anti-coking agent, 2% extreme pressure anti-wear agent, 0.3% pour point depressant, 0.03% anti-foaming agent, and the balance being unavoidable impurities.

[0026] The base oil comprises 70% synthetic hydrocarbon oils, specifically polyalphaolefin (PAO); and 30% polyether oils, specifically polyoxypropylene ether. The antioxidant is a complex of hindered phenolic and amine antioxidants in a 2:1 mass ratio. The hindered phenolic antioxidant is 2,6-di-tert-butyl-4-methylphenol, and the amine antioxidant is N,N'-di-sec-butyl-p-phenylenediamine. The anti-coking agent is a complex of a metal detergent and an ashless dispersant in a 1:1 mass ratio. The metal detergent is calcium sulfonate, and the ashless dispersant is polyisobutylene succinimide. The extreme pressure anti-wear agent is a complex of sulfurized olefins and phosphate esters in a 3:1 mass ratio. Unavoidable impurities include 0.003% sulfur and 0.002% phosphorus.

[0027] Preparation of antioxidant complex T1. Weigh the hindered phenolic antioxidant and amine antioxidant raw materials at a mass ratio of 2:1.

[0028] T2. Place the above raw materials into a 5L reactor, which is equipped with a stirring device and a temperature control device.

[0029] T3. Introduce nitrogen gas into the reactor to create a nitrogen protective atmosphere, and then heat it to 90°C.

[0030] T4. Stir and mix at 300 r / min for 1.5 hours at 90℃ to obtain the antioxidant complex.

[0031] Preparation of anti-coking compound P1. Weigh the metal cleaning agent and ashless dispersant raw materials in a mass ratio of 1:1.

[0032] P2. Add the above raw materials to a high-speed mixer. The speed of the high-speed mixer is adjustable from 500 to 2000 r / min.

[0033] P3. Set the speed of the high-speed mixer to 1200 r / min and stir for 25 minutes to obtain the anti-coking agent complex.

[0034] Lubricant preparation S1. Add the synthetic hydrocarbon oil and polyether oil to a 20L mixing tank in proportion.

[0035] S2. Turn on the heating device of the mixing vessel and heat the temperature to 55°C. At the same time, turn on the stirring device and stir at a stirring speed of 350r / min for 45 minutes to ensure that the base oil is fully mixed and homogeneous, thus obtaining the base oil mixture.

[0036] S3. After the base oil mixture temperature stabilizes at 55℃, add the antioxidant complex, anti-coking complex, and extreme pressure anti-wear complex in sequence. After each additive is added, stir at 300r / min for 18 minutes to ensure that the additive is fully dissolved in the base oil.

[0037] S4. Add pour point depressant (polymethyl methacrylate) and antifoaming agent (dimethyl silicone oil), and continue stirring at 300 r / min for 12 minutes.

[0038] S5. The blended lubricant is filtered through a multi-stage filtration system. The first stage of filtration uses a 20μm filter screen, the second stage uses a 10μm filter screen, and the third stage uses a 5μm filter screen to remove impurities and undissolved particles, thus obtaining the final high-oxidation-resistant, anti-coking high-temperature chain lubricant.

[0039] Example 2 Lubricant composition and ratio The high-oxidation, anti-coking high-temperature chain lubricant of this embodiment contains the following components by weight percentage: 70% base oil, 5% antioxidant, 3% anti-coking agent, 1% extreme pressure anti-wear agent, 0.1% pour point depressant, 0.01% anti-foaming agent, and the balance being unavoidable impurities.

[0040] The base oil comprises 60% synthetic hydrocarbon oils, specifically polyisobutylene; and 40% polyether oils, specifically polyoxyethylene ether. The antioxidant is a complex of hindered phenolic and amine antioxidants in a 1:1 mass ratio. The hindered phenolic antioxidant is 2,6-di-tert-butyl-4-ethylphenol, and the amine antioxidant is N,N'-diphenyl-p-phenylenediamine. The anti-coking agent is a complex of a metal detergent and an ashless dispersant in a 1:2 mass ratio. The metal detergent is magnesium sulfonate, and the ashless dispersant is monosuccinimide. The extreme pressure anti-wear agent is a complex of sulfurized olefins and phosphate esters in a 2:1 mass ratio. Unavoidable impurities include 0.002% sulfur and 0.001% phosphorus.

[0041] Preparation of antioxidant complex T1. Weigh the hindered phenolic antioxidant and amine antioxidant raw materials in a mass ratio of 1:1.

[0042] T2. Place the above raw materials in a 3L reactor.

[0043] T3. Introduce nitrogen gas into the reactor to create a nitrogen protective atmosphere, and then heat it to 80°C.

[0044] T4. Stir and mix at 200 r / min for 2 hours at 80℃ to obtain the antioxidant complex.

[0045] Preparation of anti-coking compound P1. Weigh the metal cleaning agent and ashless dispersant raw materials at a mass ratio of 1:2.

[0046] P2. Add the above ingredients to a high-speed mixer.

[0047] P3. Set the speed of the high-speed mixer to 1000 r / min and stir for 30 minutes to obtain the anti-coking agent complex.

[0048] Lubricant preparation S1. Add the synthetic hydrocarbon oil and polyether oil to a 15L mixing tank in proportion.

[0049] S2. Turn on the heating device of the mixing vessel and heat the temperature to 50°C. At the same time, turn on the stirring device and stir at a stirring speed of 200r / min for 60 minutes to ensure that the base oil is fully mixed and homogeneous, thus obtaining the base oil mixture.

[0050] S3. After the base oil mixture temperature stabilizes at 50℃, add the antioxidant complex, anti-coking complex, and extreme pressure anti-wear complex in sequence. After each additive is added, stir at 200 rpm for 20 minutes to ensure the additive is fully dissolved in the base oil.

[0051] S4. Add pour point depressant (alkyl naphthalene) and antifoaming agent (polyether modified silicone oil), and continue stirring at 200 r / min for 15 minutes.

[0052] S5. The blended lubricant is filtered through a multi-stage filtration system. The first stage of filtration uses a 30μm filter screen, the second stage uses a 15μm filter screen, and the third stage uses a 5μm filter screen to remove impurities and undissolved particles, thus obtaining the final high-oxidation, anti-coking high-temperature chain lubricant.

[0053] Example 3 Lubricant composition and ratio The high-oxidation, anti-coking high-temperature chain lubricant of this embodiment contains the following components by weight percentage: 85% base oil, 10% antioxidant, 8% anti-coking agent, 3% extreme pressure anti-wear agent, 0.5% pour point depressant, 0.05% anti-foaming agent, and the balance being unavoidable impurities.

[0054] The base oil comprises 80% synthetic hydrocarbon oils, specifically ethylene-propylene copolymer; and 20% polyether oils, specifically polyoxypropylene-polyoxyethylene copolymer. The antioxidant is a complex of hindered phenolic and amine antioxidants in a 3:1 mass ratio. The hindered phenolic antioxidant is 2,4,6-tri-tert-butylphenol, and the amine antioxidant is N-phenyl-N'-isopropyl-p-phenylenediamine. The anti-coking agent is a complex of a metal detergent and an ashless dispersant in a 2:1 mass ratio. The metal detergent is calcium naphthenate, and the ashless dispersant is bis(succinimide). The extreme pressure anti-wear agent is a complex of sulfurized olefins and phosphate esters in a 4:1 mass ratio. Unavoidable impurities include 0.004% sulfur and 0.003% phosphorus.

[0055] Preparation of antioxidant complex T1. Weigh the hindered phenolic antioxidant and amine antioxidant raw materials at a mass ratio of 3:1.

[0056] T2. Place the above raw materials into an 8L reactor.

[0057] T3. Introduce nitrogen gas into the reactor to create a nitrogen protective atmosphere, and then heat it to 100°C.

[0058] T4. Stir and mix at 100℃ and 400r / min for 1 hour to obtain the antioxidant complex.

[0059] Preparation of anti-coking compound P1. Weigh the metal cleaning agent and ashless dispersant raw materials at a mass ratio of 2:1.

[0060] P2. Add the above ingredients to a high-speed mixer.

[0061] P3. Set the speed of the high-speed mixer to 1500 r / min and stir for 20 minutes to obtain the anti-coking agent complex.

[0062] Lubricant preparation S1. Add the synthetic hydrocarbon oil and polyether oil to a 25L mixing vessel in proportion.

[0063] S2. Turn on the heating device of the mixing vessel and heat the temperature to 60°C. At the same time, turn on the stirring device and stir at a stirring speed of 500r / min for 30 minutes to ensure that the base oil is fully mixed and homogeneous, thus obtaining the base oil mixture.

[0064] S3. After the base oil mixture temperature stabilizes at 60℃, add the antioxidant complex, anti-coking complex, and extreme pressure anti-wear complex in sequence. After each additive is added, stir at 400 rpm for 15 minutes to ensure that the additive is fully dissolved in the base oil.

[0065] S4. Add pour point depressant (fumarate) and antifoaming agent (fluorosilicone oil), and continue stirring at 400 r / min for 10 minutes.

[0066] S5. The blended lubricant is filtered through a multi-stage filtration system. The first stage of filtration uses a 15μm filter screen, the second stage uses an 8μm filter screen, and the third stage uses a 5μm filter screen to remove impurities and undissolved particles, thus obtaining the final high-oxidation-resistant, anti-coking high-temperature chain lubricant.

[0067] Comparative Example Lubricant composition and ratio The high-temperature chain lubricant of this comparative example contains the following components by weight percentage: 80% base oil, 3% antioxidant, 2% anti-coking agent, 1% extreme pressure anti-wear agent, 0.1% pour point depressant, 0.01% anti-foaming agent, and balance unavoidable impurities.

[0068] The base oil is a single mineral oil; the antioxidant is only 2,6-di-tert-butyl-4-methylphenol; the anti-coking agent is only calcium sulfonate; and the extreme pressure anti-wear agent is only sulfurized olefins. Among unavoidable impurities, the sulfur content is 0.005% and the phosphorus content is 0.004%.

[0069] Lubricant preparation S1. Add mineral oil to a 20L mixing vessel.

[0070] S2. Turn on the heating device of the mixing vessel and heat the temperature to 50°C. At the same time, turn on the stirring device and stir at a stirring speed of 300r / min for 30 minutes.

[0071] S3. Add antioxidant, anti-coking agent and extreme pressure anti-wear agent in sequence. After each additive is added, stir at a stirring speed of 300r / min for 15 minutes.

[0072] S4. Add pour point depressant and antifoaming agent, and continue stirring at 300 r / min for 10 minutes.

[0073] S5. Filter the mixed lubricant through a 20μm filter to obtain the final high-temperature chain lubricant.

[0074] Performance testing All performance tests of this invention were conducted in accordance with the relevant Chinese national standards (GB / T), the specific standards of which are as follows: Kinematic viscosity: GB / T265-1988 Acid value: GB / T4945-2002 Flash point: GB / T3536-2008 Antioxidant properties: The increase in acid value was assessed by measuring the amount of acid value after an accelerated oxidation test (oxidation at 150°C for 1000 h).

[0075] Anti-coking performance: The amount of coking is measured in a coking test simulating high-temperature chain operation to evaluate performance.

[0076] The test results are summarized in the following table:

[0077] The test results show that the high-antioxidant and anti-coking high-temperature chain lubricants prepared in Examples 1-3 of the present invention are superior to the comparative examples in terms of kinematic viscosity, acid value, flash point, antioxidant performance and anti-coking performance. This indicates that the present invention effectively improves the antioxidant and anti-coking performance of the lubricant by rationally selecting the lubricant components and ratios and adopting a specific preparation method.

[0078] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. 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. Such 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 high-temperature chain lubricant with high antioxidant and anti-coking properties, characterized in that, This lubricant comprises the following components by weight percentage: 70%-85% base oil, 5%-10% antioxidant, 3%-8% anti-coking agent, 1%-3% extreme pressure anti-wear agent, 0.1%-0.5% pour point depressant, 0.01%-0.05% anti-foaming agent, and balance unavoidable impurities; wherein the base oil is a mixture of synthetic hydrocarbon oil and polyether oil, with synthetic hydrocarbon oil accounting for 60%-80% of the total base oil and polyether oil accounting for 20%-40% of the total base oil; among the unavoidable impurities, the sulfur content is less than 0.005% and the phosphorus content is less than 0.003%.

2. The high-oxidation, anti-coking high-temperature chain lubricant according to claim 1, characterized in that, The antioxidant is a complex of hindered phenolic antioxidants and amine antioxidants, and the mass ratio of hindered phenolic antioxidants to amine antioxidants is 1:1 to 3:

1.

3. The high-oxidation, anti-coking high-temperature chain lubricant according to claim 1, characterized in that, The anti-coking agent is a complex of a metal detergent and an ashless dispersant, and the mass ratio of the metal detergent to the ashless dispersant is 1:2-2:

1.

4. The high-oxidation, anti-coking high-temperature chain lubricant according to claim 1, characterized in that, The extreme pressure anti-wear agent is a complex of sulfurized olefins and phosphate esters, and the mass ratio of sulfurized olefins to phosphate esters is 2:1-4:

1.

5. The high-oxidation, anti-coking high-temperature chain lubricant according to claim 2, characterized in that, The complex of the hindered phenolic antioxidant and amine antioxidant is prepared by the following steps: T1. Weigh the hindered phenolic antioxidant and amine antioxidant raw materials according to the mass ratio; T2. Place the above raw materials in a reaction vessel and heat to 80℃-100℃ under a nitrogen protective atmosphere; T3. At the above temperature, stir and mix for 1-2 hours to obtain the antioxidant complex.

6. The high-oxidation, anti-coking high-temperature chain lubricant according to claim 3, characterized in that, The composite of the metal detergent and the ashless dispersant is prepared by the following steps: P1. Weigh the metal cleaning agent and ashless dispersant raw materials according to the mass ratio; P2. Add the above ingredients to a high-speed mixer; P3. Stir at a speed of 1000-1500 r / min for 20-30 minutes to obtain the anti-coking agent complex.

7. A method for preparing a high-oxidation, anti-coking high-temperature chain lubricant as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Add synthetic hydrocarbon oil and polyether oil to the mixing tank in proportion; S2. Heat to 50℃-60℃ and stir at a stirring speed of 200-500r / min for 30-60 minutes to ensure that the base oil is fully mixed and homogeneous, thus obtaining a base oil mixture; S3. After the temperature of the base oil mixture stabilizes, add the antioxidant complex, anti-coking complex, and extreme pressure anti-wear complex in sequence. After each additive is added, stir for 15-20 minutes to ensure that the additive is fully dissolved in the base oil. S4. Add pour point depressant and antifoaming agent, and continue stirring for 10-15 minutes; S5. Filter the blended lubricant to remove impurities and undissolved particles, and obtain the final high-oxidation, anti-coking high-temperature chain lubricant.

8. The preparation method according to claim 7, characterized in that, In step S5, a multi-stage filtration system is used for filtration, with the filtration accuracy increasing step by step, and the final filtration accuracy is not less than 5μm, ensuring that there are no visible impurities and particles in the lubricant.

9. The preparation method according to claim 7, characterized in that, The preparation method further includes a step of quality testing of the lubricant after filtration in step S5. The testing items include viscosity, acid value, flash point, antioxidant properties and anti-coking properties, to ensure that the various performance indicators of the lubricant meet the preset standards.

10. The preparation method according to claim 9, characterized in that, If the test results do not meet the preset standards during the quality inspection process, the lubricant is returned to the mixing tank, and the amount of additives added is adjusted according to the test results. The mixing, filtration, and testing steps are repeated until all performance indicators meet the preset standards.

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