A heat-conducting composite lubricating oil and its preparation method

Abstract

The invention discloses a heat-conducting composite lubricating oil and a preparation method thereof. The composite lubricating oil comprises the following raw materials in parts by weight: 500-600 parts of base oil, 5-10 parts of a modifying additive, 10-15 parts of octadecyl primary amine, 20-30 parts of cyclohexylamine, 40-50 parts of diphenylmethane diisocyanate, and 20-25 parts of a modified filler. During use of the lubricating oil, friction occurs, and the bond energy of the carbon-sulfur bond in the modifying additive is low, thereby causing breakage, generating sulfides containing organosilicon segments. The sulfides combine with the metal surface to form a ferric sulfate film. The organosilicon component contained in the film can enhance the rust prevention effect of the metal contact surface. The benzotriazole generated by the breakage can also coordinate with metal ions, thereby enhancing the protective effect of the lubricating oil on the metal surface. The addition of the modified filler can quickly conduct heat generated by friction, effectively solving the problem of reduced lubrication effect of the surface lubricating oil due to thermal aging.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating oil preparation, and in particular to a heat-conducting composite lubricating oil and a preparation method thereof. Background Art

[0002] Lubricating oil is a liquid or semi-solid lubricant used in automobiles and mechanical equipment to reduce friction and protect machinery and workpieces. It primarily performs functions such as lubrication, cooling, rust prevention, cleaning, sealing, and cushioning. Lubricating oil consists of two parts: base oil and additives. The base oil is the primary component of the lubricant and determines its fundamental properties. Additives compensate for and improve the base oil's performance deficiencies, imparting new properties and forming a crucial component of the lubricant. Existing lubricants release significant amounts of heat during use due to friction. This heat accumulates within the oil film, leading to thermal oxidation of the oil film, which in turn reduces or even eliminates the lubricating effect, seriously impacting its normal use. Summary of the Invention

[0003] The purpose of the present invention is to provide a heat-conducting composite lubricating oil and a preparation method thereof, which solves the problem that the current lubricating oil has a general lubricating effect and a poor heat-conducting effect.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A method for preparing a heat-conducting composite lubricating oil specifically comprises the following steps:

[0006] The following raw materials are weighed in parts by weight: 500-600 parts of base oil, 5-10 parts of modifying additive, 10-15 parts of octadecyl primary amine, 20-30 parts of cyclohexylamine, 40-50 parts of diphenylmethane diisocyanate and 20-25 parts of modified filler. The base oil, diphenylmethane diisocyanate and modified filler are mixed, and stirred for 20-30 minutes at a speed of 300-500 r / min and a temperature of 60-65° C., octadecyl primary amine and cyclohexylamine are added, the temperature is raised to 90-100° C., the reaction is carried out for 40-50 minutes, the temperature is raised to 150-160° C., and the temperature is kept for 3-5 hours. The temperature is then lowered to 70-80° C., the modifying additive is added, and the mixture is stirred evenly to prepare a thermal conductive composite lubricating oil.

[0007] Furthermore, the modified additive is prepared by the following steps:

[0008] Step A1: Octamethylcyclotetrasiloxane, tetramethylammonium hydroxide, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, and dimethyl sulfoxide are uniformly mixed, and nitrogen is introduced. The mixture is reacted at a speed of 120-150 r / min and a temperature of 90-95°C for 3-5 hours to obtain a diamine-terminated polysiloxane. The diamine-terminated polysiloxane, 1,2-epoxyhexadecane, and DMF are uniformly mixed, and the mixture is reacted at a speed of 150-200 r / min, a temperature of 40-50°C, and a pH of 9-10 for 6-8 hours to obtain intermediate 1.

[0009] Step A2: Intermediate 1, mercaptophenylboronic acid, and DMF were uniformly mixed, stirred at a speed of 120-150 r / min and a temperature of 25-30°C, and magnesium sulfate was added to react for 20-25 hours to obtain Intermediate 2. Intermediate 2, acrylic acid, dimethylphenylphosphine, and DMF were uniformly mixed, and reacted at a speed of 60-80 r / min, a temperature of 60-70°C, and irradiated with 365 nm ultraviolet light for 1-1.5 hours to obtain Intermediate 3;

[0010] Step A3: Tolylbenzotriazole, 2-aminoethanol, formaldehyde and anhydrous ethanol are mixed uniformly, and the mixture is reacted at a speed of 150-200 r / min and a temperature of 80-85°C for 7-8 hours to obtain a modifier. Intermediate 3, the modifier, p-toluenesulfonic acid and toluene are mixed uniformly, and the mixture is reacted at a speed of 120-150 r / min and a temperature of 110-120°C for 6-8 hours to obtain a modified additive.

[0011] Furthermore, the molar ratio of octamethylcyclotetrasiloxane, tetramethylammonium hydroxide and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane in step A1 is 2:1.5:1, and the molar ratio of diamine-terminated polysiloxane and 1,2-epoxyhexadecane is 1:2.

[0012] Furthermore, the amount ratio of intermediate 1, mercaptophenylboric acid and magnesium sulfate in step A2 is 15mmol:30mmol:5g, the molar ratio of intermediate 2 and acrylic acid is 1:2, and the amount of dimethylphenylphosphine is 5‰ of the mass of acrylic acid.

[0013] Furthermore, the molar ratio of methylbenzotriazole, 2-aminoethanol and formaldehyde in step A3 is 2:1:2.1, the molar ratio of intermediate 3 and modifier is 1:2, and the amount of p-toluenesulfonic acid is 1% by mass of the modifier.

[0014] Furthermore, the modified filler is prepared by the following steps:

[0015] Boron nitride and a sodium hydroxide aqueous solution are mixed, ball-milled for 24 hours at a rotation speed of 200 r / min, and then the supernatant is removed by centrifugation. The substrate is washed with a hydrochloric acid solution until it is neutral to obtain hydroxylated boron nitride. Graphene oxide, hydroxylated boron nitride, concentrated sulfuric acid and toluene are evenly mixed, reacted for 6-8 hours at a rotation speed of 60-80 r / min and a temperature of 110-120°C to obtain a composite material. The composite material is dispersed in ethanol, stirred at a rotation speed of 150-200 r / min and a temperature of 40-50°C, and KH550 and deionized water are added and reacted for 3-5 hours to obtain a modified filler.

[0016] Furthermore, the amount ratio of the boron nitride and the sodium hydroxide aqueous solution is 1g:50mL, the concentration of the sodium hydroxide aqueous solution is 2mol / L, the amount ratio of graphene oxide, hydroxyboron nitride and concentrated sulfuric acid is 5g:1g:3mL, and the amount of KH550 is 1‰ of the mass of the composite material.

[0017] Beneficial effects of the present invention: A thermally conductive composite lubricant disclosed in the present invention comprises the following raw materials: base oil, a modifying additive, octadecyl primary amine, cyclohexylamine, diphenylmethane diisocyanate and a modified filler. During the raw material blending process, octadecyl primary amine, cyclohexylamine and diphenylmethane diisocyanate react to produce polyurea, forming a polyurea grease. The surface amino groups of the modified filler can participate in the reaction of the polyurea, thereby increasing the dispersibility of the modified filler and increasing the degree of polyurea branching.

[0018] The modified additive is prepared by ring-opening octamethylcyclotetrasiloxane as a raw material, and then polymerizing with 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane to prepare a diamine-terminated polysiloxane. The diamine-terminated polysiloxane is reacted with 1,2-epoxyhexadecane to make the amino group on the diamine-terminated polysiloxane react with the epoxy group on 1,2-epoxyhexadecane to prepare an intermediate 1. The intermediate 1 is reacted with mercaptophenylboronic acid to make the hydroxyl group of the intermediate 1 react with the boronic acid group on the mercaptoboric acid ester. The reaction forms a borate ester to prepare an intermediate 2, and the intermediate 2 is reacted with acrylic acid under ultraviolet light to graft the thiol group on the intermediate 2 with the double bond on the acrylic acid to prepare an intermediate 3, and methylbenzotriazole, 2-aminoethanol and formaldehyde are reacted to react the secondary amine on the methylbenzotriazole and the amino group on the 2-aminoethanol with the aldehyde group to prepare a modifier, and the modifier is reacted with the intermediate 3 to esterify the hydroxyl group on the modifier with the carboxyl group on the intermediate 3 to prepare a modified additive.

[0019] The modified filler is prepared by treating boron nitride as a raw material with an aqueous sodium hydroxide solution so that hydroxyl groups are grafted onto the surface of the boron nitride to obtain hydroxylated boron nitride. Graphene oxide and hydroxylated boron nitride are treated with concentrated sulfuric acid so that the carboxyl groups on the graphene oxide and the hydroxyl groups on the hydroxylated boron nitride are esterified to obtain a composite material. The composite material is treated with KH550 so that amino groups are grafted onto the surface to obtain a modified filler.

[0020] During the use of lubricating oil, friction occurs, and the bond energy of the carbon-sulfur bond in the modified additive is small, which leads to fracture, producing sulfides containing silicone segments, which combine with the metal surface to form an iron sulfate film. At the same time, the film contains silicone components that can increase the rust prevention effect of the metal contact surface. The benzotriazole produced by the fracture can also coordinate with metal ions, thereby enhancing the protection of the lubricating oil on the metal surface. The addition of modified fillers can quickly conduct the heat generated by friction, effectively solving the problem of the lubrication effect of the surface lubricant decreasing due to thermal aging. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention. Example

[0022] A method for preparing a heat-conducting composite lubricating oil specifically comprises the following steps:

[0023] The following raw materials were weighed in parts by weight: 500 parts of base oil, 5 parts of modifying additive, 10 parts of octadecyl primary amine, 20 parts of cyclohexylamine, 40 parts of diphenylmethane diisocyanate and 20 parts of modified filler. The base oil, diphenylmethane diisocyanate and modified filler were mixed, and stirred at a speed of 300 r / min and a temperature of 60°C for 20 minutes. Then, octadecyl primary amine and cyclohexylamine were added, the temperature was raised to 90°C, and the reaction was carried out for 40 minutes. The temperature was raised to 150°C and kept warm for 3 hours, and then the temperature was lowered to 70°C. The modifying additive was added and stirred evenly to prepare a thermal conductive composite lubricating oil.

[0024] The type of the base oil is 150N.

[0025] The modified additive is prepared by the following steps:

[0026] Step A1: Octamethylcyclotetrasiloxane, tetramethylammonium hydroxide, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, and dimethyl sulfoxide were uniformly mixed, and nitrogen was introduced. The mixture was reacted at a speed of 120 r / min and a temperature of 90°C for 3 hours to obtain a diamine-terminated polysiloxane. The diamine-terminated polysiloxane, 1,2-epoxyhexadecane, and DMF were uniformly mixed, and the mixture was reacted at a speed of 150 r / min, a temperature of 40°C, and a pH of 9 for 6 hours to obtain Intermediate 1.

[0027] Step A2: Intermediate 1, mercaptophenylboric acid, and DMF were uniformly mixed, stirred at a speed of 120 r / min and a temperature of 25°C, and magnesium sulfate was added to react for 20 hours to obtain Intermediate 2. Intermediate 2, acrylic acid, dimethylphenylphosphine, and DMF were uniformly mixed, and reacted at a speed of 60 r / min, a temperature of 60°C, and irradiated with 365 nm ultraviolet light for 1 hour to obtain Intermediate 3;

[0028] Step A3: Mix methylbenzotriazole, 2-aminoethanol, formaldehyde and anhydrous ethanol, and react at a speed of 150 r / min and a temperature of 80°C for 7 hours to obtain a modifier. Mix intermediate 3, the modifier, p-toluenesulfonic acid and toluene, and react at a speed of 120 r / min and a temperature of 110°C for 6 hours to obtain a modified additive.

[0029] The molar ratio of octamethylcyclotetrasiloxane, tetramethylammonium hydroxide and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane described in step A1 is 2:1.5:1, and the molar ratio of diamine-terminated polysiloxane and 1,2-epoxyhexadecane is 1:2.

[0030] The amount ratio of intermediate 1, mercaptophenylboric acid and magnesium sulfate described in step A2 is 15mmol:30mmol:5g, the molar ratio of intermediate 2 and acrylic acid is 1:2, and the amount of dimethylphenylphosphine used is 5‰ of the mass of acrylic acid.

[0031] The molar ratio of methylbenzotriazole, 2-aminoethanol and formaldehyde in step A3 is 2:1:2.1, the molar ratio of intermediate 3 and modifier is 1:2, and the amount of p-toluenesulfonic acid is 1% by mass of the modifier.

[0032] The modified filler is prepared by the following steps:

[0033] Boron nitride and sodium hydroxide aqueous solution were mixed, ball-milled at a speed of 200 r / min for 24 hours, and then the supernatant was removed by centrifugation. The substrate was washed with hydrochloric acid solution until neutral to obtain hydroxylated boron nitride. Graphene oxide, hydroxylated boron nitride, concentrated sulfuric acid and toluene were mixed uniformly, reacted at a speed of 60 r / min and a temperature of 110°C for 6 hours to obtain a composite material. The composite material was dispersed in ethanol, stirred at a speed of 150 r / min and a temperature of 40°C, and KH550 and deionized water were added and reacted for 3 hours to obtain a modified filler.

[0034] The usage ratio of the boron nitride and the sodium hydroxide aqueous solution is 1 g:50 mL, the concentration of the sodium hydroxide aqueous solution is 2 mol / L, the usage ratio of graphene oxide, hydroxyboron nitride and concentrated sulfuric acid is 5 g:1 g:3 mL, and the usage amount of KH550 is 1‰ of the mass of the composite material. Example

[0035] A method for preparing a heat-conducting composite lubricating oil specifically comprises the following steps:

[0036] The following raw materials were weighed in parts by weight: 550 parts of base oil, 8 parts of modifying additive, 13 parts of octadecyl primary amine, 25 parts of cyclohexylamine, 45 parts of diphenylmethane diisocyanate and 25 parts of modified filler. The base oil, diphenylmethane diisocyanate and modified filler were mixed, and stirred at a speed of 300 r / min and a temperature of 60°C for 25 minutes. Then, octadecyl primary amine and cyclohexylamine were added, the temperature was raised to 95°C, the reaction was carried out for 45 minutes, the temperature was raised to 155°C, and the temperature was kept for 4 hours. Then, the temperature was lowered to 75°C, the modifying additive was added, and the mixture was stirred evenly to prepare a thermal conductive composite lubricating oil.

[0037] The type of the base oil is 150SN.

[0038] The modified additive is prepared by the following steps:

[0039] Step A1: Octamethylcyclotetrasiloxane, tetramethylammonium hydroxide, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, and dimethyl sulfoxide were uniformly mixed, and nitrogen was introduced. The mixture was reacted at a speed of 120 r / min and a temperature of 95°C for 4 hours to obtain a diamine-terminated polysiloxane. The diamine-terminated polysiloxane, 1,2-epoxyhexadecane, and DMF were uniformly mixed, and the mixture was reacted at a speed of 150 r / min, a temperature of 50°C, and a pH of 9 for 7 hours to obtain intermediate 1.

[0040] Step A2: Intermediate 1, mercaptophenylboric acid, and DMF were uniformly mixed, stirred at a speed of 150 r / min and a temperature of 25°C, and magnesium sulfate was added to react for 25 hours to obtain Intermediate 2. Intermediate 2, acrylic acid, dimethylphenylphosphine, and DMF were uniformly mixed, and reacted at a speed of 60 r / min, a temperature of 65°C, and irradiated with 365 nm ultraviolet light for 1.5 hours to obtain Intermediate 3;

[0041] Step A3: Mix methylbenzotriazole, 2-aminoethanol, formaldehyde and anhydrous ethanol, and react at a speed of 150 r / min and a temperature of 85°C for 7.5 hours to obtain a modifier. Mix intermediate 3, the modifier, p-toluenesulfonic acid and toluene, and react at a speed of 120 r / min and a temperature of 115°C for 7 hours to obtain a modified additive.

[0042] The molar ratio of octamethylcyclotetrasiloxane, tetramethylammonium hydroxide and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane described in step A1 is 2:1.5:1, and the molar ratio of diamine-terminated polysiloxane and 1,2-epoxyhexadecane is 1:2.

[0043] The amount ratio of intermediate 1, mercaptophenylboric acid and magnesium sulfate described in step A2 is 15mmol:30mmol:5g, the molar ratio of intermediate 2 and acrylic acid is 1:2, and the amount of dimethylphenylphosphine used is 5‰ of the mass of acrylic acid.

[0044] The molar ratio of methylbenzotriazole, 2-aminoethanol and formaldehyde in step A3 is 2:1:2.1, the molar ratio of intermediate 3 and modifier is 1:2, and the amount of p-toluenesulfonic acid is 1% by mass of the modifier.

[0045] The modified filler is prepared by the following steps:

[0046] Boron nitride and sodium hydroxide aqueous solution were mixed, ball-milled at a speed of 200 r / min for 24 hours, and then the supernatant was removed by centrifugation. The substrate was washed with hydrochloric acid solution until neutral to obtain hydroxylated boron nitride. Graphene oxide, hydroxylated boron nitride, concentrated sulfuric acid and toluene were mixed uniformly, reacted at a speed of 80 r / min and a temperature of 115°C for 7 hours to obtain a composite material. The composite material was dispersed in ethanol, stirred at a speed of 150 r / min and a temperature of 45°C, and KH550 and deionized water were added and reacted for 4 hours to obtain a modified filler.

[0047] The usage ratio of the boron nitride and the sodium hydroxide aqueous solution is 1 g:50 mL, the concentration of the sodium hydroxide aqueous solution is 2 mol / L, the usage ratio of graphene oxide, hydroxyboron nitride and concentrated sulfuric acid is 5 g:1 g:3 mL, and the usage amount of KH550 is 1‰ of the mass of the composite material. Example

[0048] A method for preparing a heat-conducting composite lubricating oil specifically comprises the following steps:

[0049] The following raw materials were weighed in parts by weight: 600 parts of base oil, 10 parts of modifying additive, 15 parts of octadecyl primary amine, 30 parts of cyclohexylamine, 50 parts of diphenylmethane diisocyanate and 25 parts of modified filler. The base oil, diphenylmethane diisocyanate and modified filler were mixed, and stirred at a speed of 500 r / min and a temperature of 65°C for 30 minutes. Then, octadecyl primary amine and cyclohexylamine were added, the temperature was raised to 100°C, and the reaction was carried out for 50 minutes. The temperature was raised to 160°C and kept warm for 5 hours. Then, the temperature was lowered to 80°C, the modifying additive was added, and the mixture was stirred evenly to prepare a thermal conductive composite lubricating oil.

[0050] The type of the base oil is 250SN.

[0051] The modified additive is prepared by the following steps:

[0052] Step A1: Octamethylcyclotetrasiloxane, tetramethylammonium hydroxide, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, and dimethyl sulfoxide were uniformly mixed, and nitrogen was introduced. The mixture was reacted at a speed of 150 r / min and a temperature of 95°C for 5 hours to obtain a diamine-terminated polysiloxane. The diamine-terminated polysiloxane, 1,2-epoxyhexadecane, and DMF were uniformly mixed, and the mixture was reacted at a speed of 200 r / min, a temperature of 50°C, and a pH of 10 for 8 hours to obtain intermediate 1.

[0053] Step A2: Intermediate 1, mercaptophenylboronic acid, and DMF were uniformly mixed, stirred at a speed of 150 r / min and a temperature of 30°C, and magnesium sulfate was added to react for 25 hours to obtain Intermediate 2. Intermediate 2, acrylic acid, dimethylphenylphosphine, and DMF were uniformly mixed, and reacted at a speed of 80 r / min, a temperature of 70°C, and irradiated with 365 nm ultraviolet light for 1.5 hours to obtain Intermediate 3;

[0054] Step A3: Tolylbenzotriazole, 2-aminoethanol, formaldehyde and anhydrous ethanol were mixed evenly, and the mixture was reacted at a speed of 200 r / min and a temperature of 85°C for 8 hours to obtain a modifier. Intermediate 3, the modifier, p-toluenesulfonic acid and toluene were mixed evenly, and the mixture was reacted at a speed of 150 r / min and a temperature of 120°C for 8 hours to obtain a modified additive.

[0055] The molar ratio of octamethylcyclotetrasiloxane, tetramethylammonium hydroxide and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane described in step A1 is 2:1.5:1, and the molar ratio of diamine-terminated polysiloxane and 1,2-epoxyhexadecane is 1:2.

[0056] The amount ratio of intermediate 1, mercaptophenylboric acid and magnesium sulfate described in step A2 is 15mmol:30mmol:5g, the molar ratio of intermediate 2 and acrylic acid is 1:2, and the amount of dimethylphenylphosphine used is 5‰ of the mass of acrylic acid.

[0057] The molar ratio of methylbenzotriazole, 2-aminoethanol and formaldehyde in step A3 is 2:1:2.1, the molar ratio of intermediate 3 and modifier is 1:2, and the amount of p-toluenesulfonic acid is 1% by mass of the modifier.

[0058] The modified filler is prepared by the following steps:

[0059] Boron nitride and sodium hydroxide aqueous solution were mixed, ball-milled at a speed of 200 r / min for 24 hours, and then the supernatant was removed by centrifugation. The substrate was washed with hydrochloric acid solution until neutral to obtain hydroxylated boron nitride. Graphene oxide, hydroxylated boron nitride, concentrated sulfuric acid and toluene were mixed uniformly, reacted at a speed of 80 r / min and a temperature of 120°C for 8 hours to obtain a composite material. The composite material was dispersed in ethanol, stirred at a speed of 200 r / min and a temperature of 50°C, and KH550 and deionized water were added and reacted for 5 hours to obtain a modified filler.

[0060] The usage ratio of the boron nitride and the sodium hydroxide aqueous solution is 1 g:50 mL, the concentration of the sodium hydroxide aqueous solution is 2 mol / L, the usage ratio of graphene oxide, hydroxyboron nitride and concentrated sulfuric acid is 5 g:1 g:3 mL, and the usage amount of KH550 is 1‰ of the mass of the composite material.

[0061] Comparative Example 1

[0062] Compared with Example 1, this comparative example uses propylene oxide instead of 1,2-epoxyhexadecane, and the other steps are the same.

[0063] Comparative Example 2

[0064] Compared with Example 1, this comparative example uses ethylenediamine instead of diamine-terminated polysiloxane, and the remaining steps are the same.

[0065] Comparative Example 3

[0066] Compared with Example 1, this comparative example uses Intermediate 3 instead of the modifying additive, and the remaining steps are the same.

[0067] Comparative Example 4

[0068] Compared with Example 1, this comparative example uses graphene instead of the modified filler, and the remaining steps are the same.

[0069] Comparative Example 5

[0070] Compared with Example 1, this comparative example uses boron nitride instead of the modified filler, and the remaining steps are the same.

[0071] The lubricating oil samples obtained in Examples 1-3 and Comparative Examples 1-5 were subjected to friction and wear tests using a four-ball friction tester. Precision bearing steel balls with a diameter of 12.7 mm and a material of Gcr15 were selected as friction balls. Under the conditions of a load of 392 N and a rotation speed of 1200 r / min, friction was carried out for 30 minutes to obtain the friction coefficient and wear spot diameter. The thermal conductivity was tested using a thermal conductivity meter. The test results are shown in the following table.

[0072]

[0073] It can be seen from the above table that this application has good lubrication and heat conduction effects.

[0074] The above content is merely an example and explanation of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A method for preparing a heat-conducting composite lubricating oil, characterized in that: The specific steps include: The following raw materials are weighed in parts by weight: 500-600 parts of base oil, 5-10 parts of modifying additive, 10-15 parts of octadecyl primary amine, 20-30 parts of cyclohexylamine, 40-50 parts of diphenylmethane diisocyanate, and 20-25 parts of modified filler; the base oil, diphenylmethane diisocyanate, and modified filler are mixed and stirred; the octadecyl primary amine and cyclohexylamine are added and reacted; the modifying additive is then added and stirred uniformly to prepare a thermal conductive composite lubricating oil; The modified additive is prepared by the following steps: Step A1: Octamethylcyclotetrasiloxane, tetramethylammonium hydroxide, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, and dimethyl sulfoxide are uniformly mixed and reacted under nitrogen protection to obtain a diamine-terminated polysiloxane. The diamine-terminated polysiloxane, 1,2-epoxyhexadecane, and DMF are then mixed and reacted to obtain Intermediate 1. Step A2: Intermediate 1, mercaptophenylboronic acid and DMF are mixed and stirred, and magnesium sulfate is added to react to obtain Intermediate 2. Intermediate 2, acrylic acid, dimethylphenylphosphine and DMF are mixed and reacted to obtain Intermediate 3; Step A3: Mixing methylbenzotriazole, 2-aminoethanol, formaldehyde and anhydrous ethanol to produce a modifier, and mixing intermediate 3, the modifier, p-toluenesulfonic acid and toluene to produce a modified additive; The modified filler is prepared by the following steps: Boron nitride and a sodium hydroxide aqueous solution are mixed and ball-milled, and the supernatant is removed by centrifugation. The substrate is washed with a hydrochloric acid solution until it is neutral to obtain hydroxylated boron nitride. Graphene oxide, hydroxylated boron nitride, concentrated sulfuric acid and toluene are mixed and reacted to obtain a composite material. The composite material is dispersed in ethanol, stirred, and KH550 and deionized water are added to react to obtain a modified filler.

2. The method for preparing a heat-conducting composite lubricating oil according to claim 1, characterized in that: The molar ratio of octamethylcyclotetrasiloxane, tetramethylammonium hydroxide and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane described in step A1 is 2:1.5:1, and the molar ratio of diamine-terminated polysiloxane and 1,2-epoxyhexadecane is 1:

2.

3. The method for preparing a heat-conducting composite lubricating oil according to claim 1, characterized in that: The amount ratio of intermediate 1, mercaptophenylboric acid and magnesium sulfate described in step A2 is 15mmol:30mmol:5g, and the molar ratio of intermediate 2 and acrylic acid is 1:

2.

4. The method for preparing a heat-conducting composite lubricating oil according to claim 1, wherein: The molar ratio of methylbenzotriazole, 2-aminoethanol and formaldehyde in step A3 is 2:1:2.1, and the molar ratio of intermediate 3 and modifier is 1:

2.

5. The method for preparing a heat-conducting composite lubricating oil according to claim 1, characterized in that: The dosage ratio of the boron nitride and the sodium hydroxide aqueous solution is 1g:50mL, the dosage ratio of graphene oxide, hydroxyboron nitride and concentrated sulfuric acid is 5g:1g:3mL, and the dosage of KH550 is 1‰ of the mass of the composite material.

6. A heat-conducting composite lubricating oil, characterized by: Prepared according to any one of claims 1 to 5.

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