A lubricating oil that does not produce carbon deposits and has the function of removing grease and its manufacturing method.

Abstract

This invention provides a carbon-free lubricating oil with sludge-removing function and its manufacturing method, comprising: a polyether base oil containing polyetheramine, polyalphaolefin (PAO), and ester oil; an ashless dispersant containing a polyisobutylene-based ashless dispersant with a number average molecular weight of 2000-3500; a molybdenum-containing friction modifier; a hindered phenolic antioxidant; and auxiliary functional additives. Through the synergistic effect between the components, metal detergents are eliminated, ash deposition is prevented from the source, and a clean lubrication system with ashless, low wear, and high oxidation resistance is constructed. Through a four-fold mechanism of "dissolution-dispersion-inhibition-repair," the system simultaneously achieves gentle removal of existing carbon deposits and sludge and strong prevention of new deposits, supports stable operation over ultra-long oil change intervals, and constructs a self-reinforcing cleaning ecosystem that becomes cleaner with use.

Description

Technical Field

[0001] This invention relates to the field of lubricating oil technology, and in particular to a lubricating oil that does not produce carbon deposits and has the function of removing grease, and a method for manufacturing the same. Background Technology

[0002] In the field of internal combustion engine lubrication, traditional fully synthetic engine oils generally use PAO or Group III base oils combined with metal detergents (such as calcium sulfonate and phenolates), ash dispersants, and a single antioxidant system to achieve basic detergent and antioxidant properties. However, this type of technical solution has the following significant inherent drawbacks: Firstly, metal detergents are prone to decomposition during high-temperature combustion, producing inorganic ash, which leads to ash accumulation on spark plugs, increased particulate matter emissions, and blockage of after-treatment systems (such as GPF and DPF), severely restricting emission compliance and aftermarket maintenance costs. Secondly, existing oils only have the ability to prevent the formation of new deposits. They lack an effective mechanism to remove stubborn sludge, varnish and carbon deposits formed during long-term engine operation. They usually need to be disassembled and cleaned, which increases the complexity of maintenance and causes unnecessary wear and tear. Third, traditional antioxidant systems (such as single hindered phenols or amines) only play a free radical scavenging role in the oil phase and cannot effectively inhibit catalytic oxidation on the metal surface, resulting in the continuous accumulation of oxidation deposits at the high-temperature interface. The measured mass of high-temperature oxidation deposits is generally higher than 10 mg (based on the modified ASTM D7627 method). Fourth, in order to maintain viscosity stability, a high proportion of viscosity index improvers are often relied upon. However, irreversible degradation is prone to occur under high shear conditions, which leads to the rupture of the lubricating film and the reduction of dispersion ability, ultimately shortening the oil change cycle to 5,000–10,000 kilometers. This makes it difficult to meet the urgent needs of high-mileage vehicles (such as taxis and logistics vehicles) for long cycles and low maintenance.

[0003] The essence of the aforementioned technical bottleneck lies in the fact that existing lubricating oil systems design "cleaning" and "anti-oxidation" functions separately, and rely on metal additives to achieve surface cleaning, failing to construct a synergistic mechanism that integrates active dissolution, stable suspension, interface inhibition, and structural protection at the molecular level. In particular, there is a lack of a lubrication solution that can gently, continuously, and efficiently remove historical carbon deposits without disassembling the engine, while simultaneously achieving zero ash deposition and ultra-long oil change intervals. Summary of the Invention

[0004] To address the aforementioned technical problems, the present invention aims to provide a lubricating oil that is free of carbon deposits and has the function of removing sludge, as well as a method for manufacturing the same. Through the synergistic effect between its components, the invention eliminates metal detergents, prevents ash deposition at the source, and constructs a clean lubrication system that is ashless, low-wear, and highly antioxidant. Through a four-fold mechanism of "dissolving-dispersing-inhibiting-repairing," the invention achieves simultaneous gentle removal of existing carbon deposits and sludge and strong prevention of new deposits, supports stable operation over ultra-long oil change intervals, and constructs a self-reinforcing cleaning ecosystem that becomes cleaner with use.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: On one hand, the present invention provides a lubricating oil that does not produce carbon deposits and has the function of removing grease, comprising the following components: Polyether base oils, which include polyether amines, polyalphaolefins (PAOs), and ester oils; Ashless dispersant, which contains polyisobutylene-based ashless dispersant with a number average molecular weight of 2000-3500; Molybdenum-containing friction modifiers; Hindered phenolic antioxidants; Additives for assistive functions.

[0006] The purpose of this invention is to provide a lubricating oil that is free of carbon deposits and has the function of removing sludge, as well as its manufacturing method. Through the synergistic effect between the components, it eliminates metal detergents and prevents ash deposition from the source, thus constructing a clean lubrication system that is ashless, low-wear, and highly antioxidant. Through a four-fold mechanism of "dissolving-dispersing-inhibiting-repairing", it achieves the simultaneous gentle removal of existing carbon deposits and sludge and the strong prevention of new deposits, supports stable operation over ultra-long oil change intervals, and constructs a self-reinforcing cleaning ecosystem that becomes cleaner with use.

[0007] In some implementations, the following components by mass percentage are included: Polyether base oil 76%–90%; Ashless dispersant 5%–15%; Molybdenum-containing friction modifier 0.5%–2%; Hindered phenolic antioxidants 0.5%–2%; Additives for auxiliary functions: 1%–5%.

[0008] In some embodiments, the mass ratio of the polyetheramine, polyα-olefin, and ester oil is (4-7):(55-60):5; The number-average molecular weight of the polyetheramine is 1000; The poly-α-olefin includes PAO4 and PAO6, wherein the mass ratio of PAO4 to PAO6 is 1:(4.5-5). The ester oils include: trimethylolpropane tri-mixed fatty acid esters and dimethylolbutanol tri-mixed fatty acid esters.

[0009] In some embodiments, the polyisobutylene-based ashless dispersant comprises: polyisobutylene-based bis(succinimide) or polyisobutylene succinate.

[0010] In some embodiments, the molybdenum-containing friction modifier comprises: molybdenum dialkyldithiocarbamate and / or molybdenum dialkyldithiophosphate.

[0011] In some embodiments, the auxiliary functional additives include at least one of antifoaming agents, rust inhibitors, and metal deactivators.

[0012] In some embodiments, the antifoaming agent is a polysiloxane, the rust inhibitor is alkenyl succinic acid, and the metal deactivator is a benzotriazole derivative.

[0013] On the other hand, the present invention provides a method for manufacturing a lubricating oil that is free of carbon deposits and has the function of removing grease, comprising the following steps: S1 Premix: Add polyether base oil, stir, and heat to the preset temperature; S2 Additive: Under the conditions of maintaining the preset temperature and stirring, add the ashless dispersant, the premix of the molybdenum-containing friction modifier and the hindered phenolic antioxidant, and the auxiliary functional additive in sequence. After each component is added, continue stirring until it is completely dissolved. S3 Homogenization: Add polyether base oil to the total volume, increase the stirring speed to the preset speed, heat to the preset temperature in step S1 and continue stirring to obtain a mixture; S4 Filtration and Degassing: The mixture obtained in step S3 is filtered and then pumped into a storage tank to remove the air introduced during the stirring process, resulting in a lubricating oil that is free of carbon deposits and has the function of removing oil stains.

[0014] In some embodiments, the stirring speed in step S1 is 50 to 70 rpm, and the heating to the preset temperature is 60°C to 70°C. In step S3, the stirring speed is increased to a preset speed of 90-110 rpm, and the stirring time is 1.5-2.5 hours after heating to the preset temperature in step S1. The filtration in step S4 is performed using a filter bag with a diameter of 3 to 8 μm.

[0015] In some embodiments, removing air introduced during the stirring process in step S4 includes the following steps: allowing the mixture to stand for at least 24 hours to remove air, or using vacuum degassing to remove air.

[0016] This invention provides a lubricating oil that is free of carbon deposits and has the function of removing grease, and a method for manufacturing the same, which has the following beneficial effects: 1) This invention provides a lubricating oil that is free of carbon deposits and has the function of removing sludge and its manufacturing method. Through the synergistic effect between the components, it eliminates metal detergents and prevents ash deposition from the source, thus constructing a clean lubrication system with no ash, low wear and high oxidation resistance. Through the four-fold mechanism of "dissolving-dispersing-inhibiting-repairing", it achieves the simultaneous gentle removal of existing carbon deposits and sludge and the strong prevention of new deposits, supports stable operation with ultra-long oil change intervals, and builds a self-reinforcing cleaning ecosystem that becomes cleaner with use.

[0017] 2) This invention provides a lubricating oil that is free of carbon deposits and has the function of removing sludge, and its manufacturing method. The polyether base oil, with its polar amine end in its block structure, accurately adsorbs the oxidation products and metal oxides on the surface of carbon deposits. At the same time, the hydrophobic ether chain penetrates deep into the carbonized interlayer, generating a physical spreading effect, peeling off stubborn sludge into nano-sized particles. If these particles do not have a subsequent stabilization mechanism, they will quickly re-aggregate. However, at this time, the ashless dispersant immediately intervenes. Its long-chain polyisobutylene tail wraps around the particles, and the polar head faces outward to form steric hindrance and electrostatic repulsion, so that the dissolved products continue to be suspended in the oil, achieving a seamless connection of "peeling and stabilization". The stronger the dissolving power of the polyether base oil, the heavier the load of the ashless dispersant. The high efficiency and stability of the ashless dispersant, in turn, ensures that the polyether base oil can continue to work and avoids the blockage of its action sites due to particle redeposition. Meanwhile, the molybdenum-containing friction modifier undergoes an in-situ reaction at the high-temperature, high-pressure metal interface, generating a nanoscale MoS2 / MoO3 composite lubricating film. This not only reduces the friction coefficient by more than 30%, but more importantly, the molybdenum element can efficiently capture free radicals generated by metal catalysis, blocking the propagation of the lubricating oil oxidation chain reaction from the source. This interfacial protection complements the free radical quenching mechanism of hindered phenolic antioxidants in the oil phase. The molybdenum-containing friction modifier protects the metal surface, while the hindered phenolic antioxidants purify the oil interior. Together, they construct a "double-layer anti-oxidation barrier," reducing oxidized deposits from 12.5 mg in traditional oils to 3.8 mg, a reduction far exceeding the theoretical limit of either component acting alone, demonstrating a nonlinear synergistic inhibition effect. The presence of hindered phenols also protects the polyether base oil itself from oxidation and breakage, ensuring that its "molecular wedge" structure remains intact during long-term operation, achieving a self-reinforcing characteristic of "getting cleaner with use." Although auxiliary functional additives do not directly participate in cleaning, they are the invisible pillars for the stable operation of the entire system. These components work together to provide environmental protection for the first four core functions, enabling the "dissolution-stabilization-inhibition-protection" quadruple mechanism to operate efficiently throughout the 15,000-kilometer oil change cycle. Ultimately, during the disassembly and inspection of the 150,000-kilometer high-mileage engine, the cleanliness of the piston ring grooves and camshaft surfaces was significantly better than the control group, and 8.5 grams of historical sludge were removed without disassembly. Detailed Implementation

[0018] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of the present invention, but not all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0019] On one hand, the present invention provides a lubricating oil that does not produce carbon deposits and has the function of removing grease, comprising the following components: Polyether base oils, which include polyether amines, polyalphaolefins (PAOs), and ester oils; Ashless dispersant, which contains polyisobutylene-based ashless dispersant with a number average molecular weight of 2000-3500; Molybdenum-containing friction modifiers; Hindered phenolic antioxidants; Additives for assistive functions.

[0020] The purpose of this invention is to provide a lubricating oil that is free of carbon deposits and has the function of removing sludge, as well as its manufacturing method. Through the synergistic effect between the components, it eliminates metal detergents and prevents ash deposition from the source, thus constructing a clean lubrication system that is ashless, low-wear, and highly antioxidant. Through a four-fold mechanism of "dissolving-dispersing-inhibiting-repairing", it achieves the simultaneous gentle removal of existing carbon deposits and sludge and the strong prevention of new deposits, supports stable operation over ultra-long oil change intervals, and constructs a self-reinforcing cleaning ecosystem that becomes cleaner with use.

[0021] Preferably, it comprises the following components by mass percentage: Polyether base oil 76%–90%; Ashless dispersant 5%–15%; Molybdenum-containing friction modifier 0.5%–2%; Hindered phenolic antioxidants 0.5%–2%; Additives for auxiliary functions: 1%–5%.

[0022] Preferably, the mass ratio of the polyetheramine, polyα-olefin, and ester oil is (4-7):(55-60):5; The number-average molecular weight of the polyetheramine is 1000; The poly-α-olefin includes PAO4 and PAO6, wherein the mass ratio of PAO4 to PAO6 is 1:(4.5-5). The ester oil includes: trimethylolpropane tri-mixed fatty acid ester and dimethylolbutanol tri-mixed fatty acid ester, wherein the mass ratio of the trimethylolpropane tri-mixed fatty acid ester to the dimethylolbutanol tri-mixed fatty acid ester is 1:1.

[0023] Preferably, the polyisobutylene-based ashless dispersant comprises: polyisobutylene-based bis(succinimide) or polyisobutylene succinate.

[0024] Preferably, the molybdenum-containing friction modifier comprises: molybdenum dialkyldithiocarbamate and / or molybdenum dialkyldithiophosphate; The hindered phenolic antioxidant is a β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate compound.

[0025] Preferably, the auxiliary functional additives include at least one of: antifoaming agents, rust inhibitors, and metal deactivators.

[0026] Preferably, the antifoaming agent is polysiloxane, the rust inhibitor is alkenyl succinic acid, and the metal deactivator is a benzotriazole derivative.

[0027] On the other hand, the present invention provides a method for manufacturing a lubricating oil that is free of carbon deposits and has the function of removing grease, comprising the following steps: S1 Premix: Add polyether base oil, stir, and heat to the preset temperature; S2 Additive: Under the conditions of maintaining the preset temperature and stirring, add the ashless dispersant, the premix of the molybdenum-containing friction modifier and the hindered phenolic antioxidant, and the auxiliary functional additive in sequence. After each component is added, continue stirring until it is completely dissolved. S3 Homogenization: Add polyether base oil to the total volume, increase the stirring speed to the preset speed, heat to the preset temperature in step S1 and continue stirring to obtain a mixture; S4 Filtration and Degassing: The mixture obtained in step S3 is filtered and then pumped into a storage tank to remove the air introduced during the stirring process, resulting in a lubricating oil that is free of carbon deposits and has the function of removing oil stains.

[0028] Preferably, the stirring speed in step S1 is 50-70 rpm, and the heating to the preset temperature is 60℃-70℃. In step S3, the stirring speed is increased to a preset speed of 90-110 rpm, and the stirring time is 1.5-2.5 hours after heating to the preset temperature in step S1. The filtration in step S4 is performed using a filter bag with a diameter of 3 to 8 μm.

[0029] Preferably, removing air introduced during the stirring process in step S4 includes the following steps: allowing the mixture to stand for at least 24 hours to remove air, or using vacuum degassing to remove air.

[0030] Example 1 Raw material selection: Polyetheramine (number average molecular weight 1000, Huntsman Jeffamine M-1000), PAO4 (ExxonMobil PAO 4), PAO6 (ExxonMobil PAO 6), and ester oil (Evonik Tegomer 3403, trimethylolpropane tri-mixed fatty acid ester: dimethylolbutanol tri-mixed fatty acid ester = 1:1) are compounded in a mass ratio of polyetheramine: PAO: ester oil = 5:58:5 to form a polyether base oil. The mass ratio of PAO4 to PAO6 in the PAO component is 1:5, and the overall kinematic viscosity (100℃) is approximately 8.2 cSt. Ashless dispersant: Polyisobutylene (Mn=2500) bis(succinimide) ashless dispersant, nitrogen content about 2.1% (preferably commercially available Infineum OLOA 11000); Molybdenum-containing friction modifier: Molybdenum dialkyl dithiocarbamate (MoDTC), molybdenum content approximately 8.5%; Hindered phenolic antioxidant: β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate isooctyl ester; Auxiliary functional additives: antifoaming agent T901; rust inhibitor T746; metal deactivator T551.

[0031] This invention provides a method for manufacturing a lubricating oil that is free of carbon deposits and has the function of removing oil sludge, comprising the following steps: S1 Premix: Add 60% of the formula amount of polyether base oil (approximately 49.68 kg, based on a total formula amount of 100 kg) to a 50 L mixing vessel, start the stirrer (speed 60 rpm), turn on the heating system, and slowly raise the oil temperature to 65 °C at a heating rate of 5 °C / min, and keep it at that temperature for 5 minutes. S2 Additive: Under constant temperature of 65℃ and stirring (60 rpm), slowly add 10.0 kg of polyisobutylene (Mn=2500) bis(succinimide) ashless dispersant, 2.2 kg of molybdenum dialkyl dithiocarbamate and β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate isooctyl ester premix, 2.4995 kg of rust inhibitor T746, and 2.4995 kg of metal deactivator T551 in sequence. After each component is added, continue stirring for 15 minutes. Take a sample to observe and confirm that it is completely dissolved without stratification before proceeding to the next step. Finally, add 0.001 kg of antifoaming agent T901 and stir for 15 minutes until completely dissolved. The mass ratio of molybdenum dialkyl dithiocarbamate to β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate isooctyl ester premix is ​​1.2:1. S3 Homogenization: Add the remaining 33.12kg of polyether base oil to the total formula amount of 100kg, increase the stirring speed to 100rpm, and continue stirring for 2 hours under constant temperature of 65℃ to obtain the blended oil. S4 Filtration and Degassing: The blended oil is passed through a 5μm precision filter bag and pumped into the finished product storage tank at a flow rate of 0.5m³ / h; a vacuum degassing device (vacuum degree -0.08MPa) is used to degas the oil in the storage tank for 30 minutes to remove air. S5 Sampling and Inspection: After degassing, samples are taken from the top, middle and bottom of the storage tank, mixed and tested for physical and chemical properties. After passing the test, the samples are sealed and stored to obtain lubricating oil that is free of carbon deposits and has the function of removing oil stains.

[0032] Example 2 Raw material selection: Polyether base oil: Polyetheramine (number average molecular weight 1000, Huntsman Jeffamine M-800), PAO4 (ExxonMobil PAO 4), PAO6 (ExxonMobil PAO 6), and ester oil (Evonik Tegomer 3403 trimethylolpropane tri-mixed fatty acid ester: dimethylolbutanol tri-mixed fatty acid ester = 1:1) are compounded at a mass ratio of polyetheramine: PAO: ester oil = 7:60:5 to form polyether base oil. The mass ratio of PAO4 to PAO6 in the PAO component is 1:4.5, and the overall kinematic viscosity (100℃) is approximately 9.5 cSt. Ashless dispersant: Polyisobutylene (Mn=2000) bis(succinate) ashless dispersant with nitrogen content of about 1.8% (preferably commercially available model Jinzhou Kangtai KTD1280). Molybdenum-containing friction modifier: molybdenum dialkyl dithiophosphate (MoDTP), molybdenum content approximately 7.8%; Hindered phenolic antioxidant: β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate octadecyl ester; Auxiliary functional additives: antifoaming agent T901; rust inhibitor T746; metal deactivator T551 (mass ratio 1:3:2).

[0033] This invention provides a method for manufacturing a lubricating oil that is free of carbon deposits and has the function of removing oil sludge, comprising the following steps: S1 Premix: Add 50% of the formula amount of polyether base oil (approximately 40.0 kg, based on a total formula amount of 100 kg) to a 50 L mixing vessel, start the stirrer (50 rpm), heat to 60 °C, and keep warm for 10 minutes; S2 Additive: Under constant temperature of 60℃ and stirring (50 rpm), add 5.0 kg of polyisobutylene (Mn=2000) bis(succinate) ashless dispersant, 0.5 kg of molybdenum dialkyl dithiophosphate and 0.5 kg of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate octadecyl ester premix, 1.0 kg of antifoaming agent T901, rust inhibitor T746, and metal deactivator T551 (mass ratio 1:3:2). After each addition of a component, continue stirring for 20 minutes. After confirming complete dissolution, proceed to the next step. S3 Homogenization: Add the remaining 40.0 kg of polyether base oil to the total formula amount of 100 kg, increase the stirring speed to 90 rpm, and continue stirring at a constant temperature of 60℃ for 2.5 hours to obtain the blended oil. S4 Filtration and Degassing: The blended oil is passed through a 3μm precision filter bag and pumped into the finished product storage tank; it is then allowed to stand for 24 hours to remove air. S5 Sampling and Inspection: After the standing period is completed, a sample is taken, and after passing the test, it is packaged and stored to obtain a lubricating oil without carbon deposits and with the function of removing oil stains.

[0034] Example 3 Raw material selection: Polyether base oil: Polyetheramine (number average molecular weight 1000, Huntsman Jeffamine M-1200), PAO4 (ExxonMobil PAO 4), PAO6 (ExxonMobil PAO 6), and ester oil (Evonik Tegomer 3403 trimethylolpropane tri-mixed fatty acid ester: dimethylolbutanol tri-mixed fatty acid ester = 1:1) are compounded at a mass ratio of polyetheramine: PAO: ester oil = 4:55:5 to form polyether base oil. In the PAO component, the mass ratio of PAO4 to PAO6 is 1:4.8, and the overall kinematic viscosity (100℃) is approximately 7.0 cSt. Ashless dispersant: Polyisobutylene (Mn=3500) bis(succinimide) ashless dispersant, nitrogen content approximately 2.3% (preferred commercially available model: Chevron Oronite: OLOA 24000); Molybdenum-containing friction modifier: a compound of molybdenum dialkyl dithiocarbamate (MoDTC) and molybdenum dialkyl dithiophosphate (MoDTP) (mass ratio 1:1), with a total molybdenum content of approximately 8.2%; Hindered phenolic antioxidant: β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate isooctyl ester; Auxiliary functional additives: antifoaming agent T901, rust inhibitor T746, metal deactivator T551 (mass ratio 1:2:2).

[0035] This invention provides a method for manufacturing a lubricating oil that is free of carbon deposits and has the function of removing oil sludge, comprising the following steps: S1 Premix: Add 65% of the formula amount of polyether base oil (approximately 50.96 kg, based on a total formula amount of 100 kg) to a 50 L mixing vessel, start the stirrer (70 rpm), heat to 70 °C, and keep warm for 5 minutes; S2 Additive: Under constant temperature of 70℃ and stirring (70 rpm), add 15.0 kg of polyisobutylene (Mn=3500) bis(succinimide) ashless dispersant, 2.0 kg of a mixture of molybdenum dialkyl dithiocarbamate (MoDTC) and molybdenum dialkyl dithiophosphate (MoDTP) (mass ratio 1:1), 2.0 kg of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate isooctyl ester, 5.0 kg of antifoaming agent T901, rust inhibitor T746, and metal deactivator T551 (mass ratio 1:2:2). After each component is added, continue stirring for 15 minutes. After confirming complete dissolution, proceed to the next step. S3 Homogenization: Add the remaining 27.44 kg of polyether base oil to the total formula amount of 100 kg, increase the stirring speed to 110 rpm, and continue stirring at a constant temperature of 70℃ for 1.5 hours to obtain the blended oil. S4 Filtration and Degassing: The blended oil is passed through an 8μm precision filter bag and pumped into the finished product storage tank; a vacuum degassing device (vacuum degree -0.09MPa) is used to degas for 25 minutes to remove air; S5 Sampling and Inspection: After degassing is completed, a sample is taken, and after passing the test, it is packaged and stored to obtain a lubricating oil without carbon deposits and with the function of removing oil stains.

[0036] Comparative Example 1 Raw material selection (conventional fully synthetic oil formulation system) PAO base oil (PAO4, kinematic viscosity at 100°C approximately 4.1 cSt); Group III base oils (hydrocracked base oils, kinematic viscosity at 100°C approximately 6.5 cSt); Ashless dispersant: Polyisobutylene (Mn=2000) bis(succinate) ashless dispersant with nitrogen content of about 1.8% (preferably commercially available model Jinzhou Kangtai KTD1280). Calcium salt detergent (high alkalinity synthetic calcium sulfonate, calcium content approximately 12%). Antioxidant: 2,6-di-tert-butyl-p-cresol; Zinc dialkyl dithiophosphate (ZDDP, phosphorus content approximately 8%) Auxiliary functional additives: Antifoaming agent T901 (polymethylsiloxane), rust inhibitor T746 (alkenyl succinic acid) This invention provides a method for manufacturing fully synthetic oil, comprising the following steps: S1 base oil mixing: Add 40.0 kg PAO base oil and 50.0 kg Group III base oil to a 50 L mixing vessel, start stirring (60 rpm), heat to 55 °C, and stir for 10 minutes to ensure the base oils are evenly mixed; S2 Stepwise Addition: Add 5.0 kg of polyisobutylene (Mn=2000) bis(butylene) ester ashless dispersant, 2.5 kg of high-alkalinity synthetic calcium sulfonate, 0.8 kg of 2,6-di-tert-butyl-p-cresol, and 1.6 kg of dialkyl dithiophosphate zinc sequentially. Stir for 10 minutes after each addition. Finally, add 0.001 kg of antifoaming agent T901 and 0.099 kg of rust inhibitor T746, and stir for 10 minutes. S3 Homogenization Filtration: Increase the stirring speed to 80 rpm and stir continuously for 1 hour. Then filter through a 5μm filter bag into the finished product storage tank. After standing for 12 hours, take a sample for testing. If it passes the test, package it.

[0037] This invention provides a fully synthetic oil, manufactured according to the above-mentioned method for producing a lubricating oil that is free of carbon deposits and has the function of removing sludge, comprising the following components by weight percentage: 40.0% PAO base oil, 50.0% Group III base oil, 5.0% ashless dispersant, 2.5% calcium salt detergent, 0.8% 2,6-di-tert-butyl-p-cresol, 1.6% zinc dialkyl dithiophosphate, and 0.1% auxiliary functional additives.

[0038] Comparative Example 2 Comparative Example 2 used the same raw materials as Example 1, except that the polyether base oil was replaced with an equal mass of PAO4 (ExxonMobil PAO 4) + PAO6 (ExxonMobil PAO 6) (PAO4 to PAO6 mass ratio of 1:5).

[0039] The lubricant manufacturing method provided in Comparative Example 2 replaces the polyether base oil added in step S1 at 60% of the formulation amount with an equal mass of PAO4 and PAO6 (the mass ratio of PAO4 to PAO6 is 1:5), while the remaining steps and parameters remain completely consistent with those in Example 1.

[0040] Comparative Example 3 Comparative Example 3 used the same raw materials as Example 1, except that the molybdenum-containing friction modifier was removed.

[0041] The method for manufacturing the lubricating oil provided in Comparative Example 3 differs only in that the molybdenum-containing friction modifier is removed in step S2 (addition step), and β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate isooctyl ester is added separately (without premixing with the molybdenum-containing friction modifier). In step S3, the polyether base oil is added to the total formulation amount of 100 kg during circulation homogenization. The remaining steps and parameters are unchanged from those in Example 1.

[0042] Experimental methods 1. High-Temperature Oxidation Sediment Simulation Experiment Test basis: Based on the improved SH / T0753-2005 standard, with enhanced oxidation conditions; Experimental equipment: high-temperature oxidation tester, electronic analytical balance (accuracy 0.1mg), copper catalyst wire (specifications: Φ1.5mm×50mm, purity 99.9%). Test conditions: The copper wire was pretreated and weighed (recorded as m0), then immersed in 50 mL of the oil to be tested, kept at a constant temperature of 165℃, and oxidized by forced air circulation (flow rate 20 mL / min) for 48 hours. Evaluation index: After the test, the copper wire was cleaned with petroleum ether, dried and weighed (recorded as m1). The mass of the sediment = m1 - m0.

[0043] 2. Bench test for removing historical oil stains from the engine Test subject: 1.6L naturally aspirated gasoline engine (has run for 150,000 kilometers, disassembly and inspection confirmed that there is obvious sludge in the oil pan and valve cover, and carbon deposits on the piston top). Test equipment: engine bench test system, high-definition industrial camera, electronic analytical balance, solvent extraction device; Experimental steps: Original state record: Drain the old engine oil, take high-definition photos of key parts such as the oil pan, valve cover, and oil pump filter, and mark the initial state of the deposits; rinse with solvent to collect the initial deposits and weigh them (recorded as m_initial). Refueling and running: Add 4L of test oil and run under standard conditions (idle speed 5min → low speed 1500rpm / 20% load for 10min → high speed 3000rpm / 80% load for 5min, cycle 240 times, accumulate 100 hours, simulate 5000 kilometers of driving). Results detection: Drain the test oil, repeat the initial state recording steps, take photos of key parts, collect the removed sediment and weigh it (recorded as m removal). Evaluation indicators: amount of sediment removed, residual state of oil sludge and carbon deposits in key areas (scored by photo comparison, 0-5 points, 0 points for no residue, 5 points for no change).

[0044] 3. Long-term driving test Test subjects: 30 identical taxis (Volkswagen Jetta, 1.4L, average annual mileage of 120,000 km), randomly divided into two groups of 5 vehicles each, using the fuels of Examples 1-3 and Comparative Examples 1-3 respectively; Test conditions: Normal commercial operation, oil change interval of 15,000 kilometers, recording oil pressure and fuel consumption data during driving; Test items: During the oil change interval: test the kinematic viscosity (100℃), total acid value, and total base value of the engine oil every 3,000 kilometers; When changing the oil: observe the condition of the old engine oil (color, viscosity, separation), weigh the oil filter (marked as m filter back), compare it with the weight of the new filter (m filter front), and calculate the increase in filter weight (degree of filter blockage). Test completion: Select two high-mileage vehicles (cumulative mileage of 150,000 kilometers) in each group, disassemble the engine, and test the piston ring groove cleanliness and camshaft surface roughness, and score according to APISP standards.

[0045] 4. Ash content test Test standard: GB / T508-2015 "Determination of Ash Content in Engine Oil"; Experimental equipment: muffle furnace, electronic analytical balance (accuracy 0.1 mg), porcelain crucible; Experimental procedure: Weigh 10g of the oil to be tested (denoted as m oil) into a pre-weighed porcelain crucible (denoted as m crucible), carbonize it at low temperature, and then place it in a muffle furnace and ignite it at 600℃ until constant weight (denoted as m total). Evaluation index: Ash content (%) = (m total - m crucible) / m oil × 100%.

[0046] The experimental data of the samples from Examples 1-3 and Comparative Examples 1-3, tested using the above experimental methods, are compared in Table 1 below: Table 1 Comparison of experimental data for samples from Examples 1-3 and Comparative Examples 1-3 From Table 1, we can observe that the high-temperature oxidized deposit mass (4.0-4.2 mg), oil stain removal amount (7.8-9.2 g), and ash content (0.018-0.022%) of Examples 1-3 are all superior to Comparative Example 1, achieving the core objectives of "ashless, clean, and long-lasting". Among them, Example 3, due to its higher proportion of ashless dispersant, has a slightly higher oil stain removal amount than Examples 1 and 2, further demonstrating the enhanced dispersion stabilization effect of ashless dispersant; Example 2, due to its higher proportion of polyether base oil, has better kinematic viscosity stability and slightly lower oil consumption.

[0047] After Comparative Example 2 was replaced with pure PAO, the amount of oil residue removed was only 2.3g, which was only 27% of that in Example 1. The mass of high-temperature oxidized deposits (9.6mg) was close to that of Comparative Example 1, and the piston ring groove cleanliness score dropped to 78. The reason is that pure PAO base oil lacks the polar block structure of polyether and cannot achieve the core function of "dissolving-stripping" carbon deposits. Even if components such as ashless dispersants and molybdenum-containing friction modifiers are retained, they cannot play a cleaning role. This proves that polyether base oil is the basis of the "dissolving-dispersing-inhibiting-repairing" quadruple mechanism and forms an irreplaceable synergistic effect with other components.

[0048] Comparative Example 3 (lacking molybdenum-containing friction modifier): Although the amount of oil sludge removed (7.1g) was close to that of Example 1 (8.5g), the mass of high-temperature oxidized deposits (8.9mg) increased significantly, the kinematic viscosity change rate (13%) was higher than that of Example 1 (8%), and the surface roughness of the camshaft (Ra=0.04μm) deteriorated. The reason is that without the molybdenum-containing friction modifier, a "double-layer anti-oxidation barrier" cannot be formed, the catalytic oxidation of the metal surface cannot be inhibited, and the oxidation rate of the lubricating oil is accelerated. Although the polyether base oil can still dissolve some carbon deposits, the oxidation products are easily redeposited, leading to a decrease in long-term stability. This proves that the synergistic antioxidant effect of the molybdenum-containing friction modifier and the hindered phenolic antioxidant is the key to achieving the "cleaner with use" self-enhancing ecological effect.

[0049] All embodiments are superior to Comparative Example 1 (conventional fully synthetic oil): The ash content of Examples 1-3 is all below 0.025%, achieving ashless lubrication and avoiding ash clogging of the post-treatment system; the amount of oil stain removal is 6-7.7 times that of Comparative Example 1, and the mass of high-temperature oxidation deposits is only 32-34% of that of Comparative Example 1, with significantly better long-term driving stability, fully demonstrating the technical advantages of this invention in abandoning metal detergents and constructing an ashless synergistic system.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A lubricating oil that does not produce carbon deposits and has the function of removing grease, characterized in that, Includes the following components: Polyether base oils, which include polyether amines, polyalphaolefins and ester oils; Ashless dispersant, which contains polyisobutylene-based ashless dispersant with a number average molecular weight of 2000-3500; Molybdenum-containing friction modifiers; Hindered phenolic antioxidants; Additives for assistive functions.

2. The lubricating oil without carbon deposition and with oil dirt removing function according to claim 1, characterized by, The components include the following percentages by mass: Polyether base oil 76%–90%; Ashless dispersant 5%–15%; Molybdenum-containing friction modifier 0.5%–2%; Hindered phenolic antioxidants 0.5%–2%; Additives for auxiliary functions: 1%–5%.

3. The lubricating oil without carbon deposition and with oil dirt removing function according to claim 1, characterized by, The mass ratio of the polyetheramine, polyα-olefin, and ester oil is (4-7):(55-60):5; The number-average molecular weight of the polyetheramine is 1000; The poly-α-olefin includes PAO4 and PAO6, wherein the mass ratio of PAO4 to PAO6 is 1:(4.5-5). The ester oils include: trimethylolpropane tri-mixed fatty acid esters and dimethylolbutanol tri-mixed fatty acid esters.

4. The lubricating oil without carbon deposition and with oil stain removing function according to claim 1 or 2, characterized by, The polyisobutylene-based ashless dispersant includes: polyisobutylene-based bis(succinimide) or polyisobutylene succinate.

5. The lubricating oil without carbon deposition and with oil dirt removing function according to claim 1 or 2, characterized by, The molybdenum-containing friction modifier includes: molybdenum dialkyl dithiocarbamate and / or molybdenum dialkyl dithiophosphate.

6. The lubricating oil according to claim 1 or 2, wherein The auxiliary functional additives include at least one of the following: antifoaming agents, rust inhibitors, and metal deactivators.

7. The lubricating oil according to claim 6, wherein The antifoaming agent is polysiloxane, the rust inhibitor is alkenyl succinic acid, and the metal deactivator is a benzotriazole derivative.

8. A method of producing a lubricating oil having no carbon deposit and a function of removing sludge, characterized by, Manufacturing a lubricating oil that is free of carbon deposits and has the function of removing sludge as described in any one of claims 1-7 comprises the following steps: S1 Premix: Add a portion of polyether base oil, stir, and heat to the preset temperature; S2 Additive: Under the conditions of maintaining the preset temperature and stirring, add the ashless dispersant, the premix of the molybdenum-containing friction modifier and the hindered phenolic antioxidant, and the auxiliary functional additive in sequence. After each component is added, continue stirring until it is completely dissolved. S3 Homogenization: Add polyether base oil to the total volume, increase the stirring speed to the preset speed, heat to the preset temperature in step S1 and continue stirring to obtain a mixture; S4 Filtration and Degassing: The mixture obtained in step S3 is filtered and then pumped into a storage tank to remove the air introduced during the stirring process, resulting in a lubricating oil that is free of carbon deposits and has the function of removing oil stains.

9. The method for producing a lubricating oil having no carbon deposit and a function of removing sludge according to claim 8, characterized by, The stirring speed in step S1 is 50-70 rpm, and the heating to the preset temperature is 60℃-70℃; In step S3, the stirring speed is increased to a preset speed of 90-110 rpm, and the stirring time is 1.5-2.5 hours after heating to the preset temperature in step S1. The filtration in step S4 is performed using a filter bag with a diameter of 3 to 8 μm.

10. The method of manufacturing lubricating oil without carbon deposition and with oil dirt removing function according to claim 8, characterized by, Step S4 involves removing air introduced during the stirring process, including the following steps: allowing the mixture to stand for at least 24 hours to remove air, or using vacuum degassing to remove air.

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