A kind of high oxidation resistance wear-resistant lubricating oil and preparation method thereof

Abstract

The present invention relates to the technical field of lubricating oils, and in particular to a highly anti-oxidative and anti-friction lubricating oil and a preparation method thereof. The lubricating oil comprises the following components by mass: 100 parts of a mineral oil base oil; 1-5 parts of an antioxidant; the antioxidant is an amine antioxidant, and the amine antioxidant has at least a trimethylamine group in its structure. Compared with the prior art, the lubricating oil provided by the present invention has extremely high anti-oxidative and anti-friction properties.

Description

Technical Field

[0001] The invention belongs to the technical field of lubricating oils, and in particular relates to a highly anti-oxidative and anti-friction lubricating oil and a preparation method thereof. Background Art

[0002] Lubricating oil and grease are generally considered a type of "lubricant". Simply put, a lubricant is something that exists between two objects in relative motion and has the function of reducing the friction between the two objects due to contact. Lubricating oil is a technology-intensive product, a complex mixture of hydrocarbons, and its actual performance is the comprehensive effect of complex physical or chemical changes. The basic properties of lubricating oil include general physical and chemical properties, special physical and chemical properties, and simulated bench tests.

[0003] There are many variables in the use of lubricating oil, such as the composition of the lubricating oil, the degree of contamination, and the details of equipment operation, which will greatly affect the service life of the lubricating oil. In particular, during use, it will inevitably come into contact with air, and the oil will oxidize. The copper and iron in the metal parts, as well as harsh conditions such as high pressure, high temperature, high friction and high metal concentration will accelerate the oxidation of the lubricating oil, leading to the degradation of the lubricating oil and the production of degradation products, forming various oxidation products with higher or lower molecular weights relative to crude oil, and ultimately leading to an increase in the acid value and viscosity of the oil, a darkening of the color, and the production of surface deposits, which seriously affect the operation of the equipment. In order to solve the problem of oxidation hazards of lubricating oil under different working conditions and improve its antioxidant properties or thermal oxidation stability, specific compounds must be added to achieve this.

[0004] For example, CN115678647A discloses an antioxidant lubricating oil composition and a preparation method thereof. The antioxidant lubricating oil composition disclosed in the application is composed of the following raw materials in parts by weight: 75-100 parts by weight of base oil, 3-8 parts by weight of antioxidant, 1-4 parts by weight of anti-wear agent, and 2-5 parts by weight of dispersant. The application uses polymer compounds as antioxidants. The molecular chains of polymer compounds are relatively long and the structures are complex. Their solubility in lubricating oil is usually not as good as that of small molecule antioxidants. Many polymer compounds may not be completely dissolved in lubricating oil, resulting in precipitation or turbidity. Although polymer antioxidants have multiple potential antioxidant active sites, due to the limitations of their molecular structure, the utilization efficiency of these active sites is not as good as that of small molecule antioxidants.

[0005] For example, CN104059716A discloses an antioxidant automotive lubricant, which is made of the following components by weight: 30-50 parts of modified nanodiamond, 50-70 parts of base oil, 20-30 parts of organic molybdenum mixture, 10-20 parts of antioxidant, and 15-30 parts of friction modifier. The application uses antioxidants in automotive lubricants to inhibit the oxidation and decomposition of active ingredients in the lubricants and improve the viscosity index of the oil. However, the antioxidants used in the application are ZDDP and aromatic amines, which are highly toxic, and ZDDP is easily decomposed at high temperatures, and the stability of the antioxidant is insufficient.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a highly anti-oxidation and anti-friction lubricating oil and a preparation method thereof. The lubricating oil provided by the present invention has extremely high anti-oxidation and anti-friction properties.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] In a first aspect, an embodiment of the present invention provides a highly antioxidant anti-friction lubricating oil, comprising the following components in parts by mass:

[0010] 100 parts of mineral oil base oil;

[0011] 1-5 parts of antioxidants;

[0012] The antioxidant is an amine antioxidant, and the amine antioxidant has at least a trimethylamine group in its structure.

[0013] In a preferred embodiment, the antioxidant comprises a compound represented by the following formula (1):

[0014]

[0015] The compound represented by formula (1) prepared by the present invention has a greatly improved antioxidant property for mineral base oil. In particular, the structure represented by formula (1) defined by the present invention is connected to another dimethylamine skeleton through a diphenylamine skeleton, and the hydrogen atoms on the amino groups in the diphenylamine molecules are relatively active and can be easily oxidized to generate nitroxide free radicals. This nitroxide free radical can combine with the active free radicals (generated during the oxidation process of the protected material, thereby interrupting the oxidation chain reaction and playing an antioxidant role. When diphenylamine is connected to dimethylamine, a synergistic antioxidant effect will be produced. This is because their antioxidant active sites can cooperate with each other. The compound formed by connecting diphenylamine and dimethylamine can play a role in different oxidation stages. In the early stage of oxidation, the diphenylamine part may first react with the peroxyl radical. As the oxidation process proceeds, the dimethylamine part can then play a role and continue to capture the active free radicals generated subsequently. This relay antioxidant process can more effectively inhibit the oxidation chain reaction, thereby improving the antioxidant performance. And the molecular structure after the two are connected increases the stability of the antioxidant molecule to a certain extent. The mutual connection between diphenylamine and dimethylamine changes the spatial structure of the molecule, which may reduce the consumption of active sites by unnecessary side reactions. In addition, the dimethylamine skeleton is connected to an N-methylpiperidine and trimethylamine. First of all, the steric hindrance generated by this branched structure can make the reaction between the antioxidant and the free radicals It should be more controllable. When the free radical is close to the antioxidant molecule, the larger steric hindrance will hinder its rapid contact and overreaction with the antioxidant active site, making the reaction rate moderate, thereby extending the action time of the antioxidant and continuously exerting the antioxidant effect. In addition, the nitrogen atom in the N-methylpiperidine molecule has a lone pair of electrons, which can provide electrons to the free radical, so that it can form a relatively stable free radical intermediate, thereby interrupting the oxidation chain reaction and achieving the antioxidant effect. In addition, the ring structure of N-methylpiperidine and the presence of methyl groups will produce certain steric hindrance. When it reacts with free radicals to form an intermediate, this steric hindrance can prevent the intermediate from further unnecessary reactions, making it more stable, thereby enhancing the antioxidant performance, and trimethylamine is easily oxidized, and the product generated after its oxidation can accept electrons and be reduced, regenerating trimethylamine, and then participating in the redox process again. Therefore, N-methylpiperidine first reacts with the generated free radicals, and the generated intermediate can then transfer electrons with the product after trimethylamine oxidation, so that the antioxidant effect of the system can be sustained, achieving a cycle, so as to improve the antioxidant performance.

[0016] In a preferred embodiment, the compound represented by formula (1) includes the following synthesis route:

[0017]

[0018] Synthesis of compound Sub-2:

[0019] Sub-1 was dissolved in a solvent and heated to 50° C. for 2 h, wherein the solvent included water and tetrahydrofuran, and the volume of water and tetrahydrofuran was 1:1. After heating, the mixture was cooled and column chromatography was performed to obtain Sub-2.

[0020]

[0021] Synthesis of compound Sub-4:

[0022] Under nitrogen atmosphere, Sub-3 was dissolved in tetrahydrofuran, heated under reflux for 3 h, cooled and purified by column chromatography to obtain Sub-4.

[0023]

[0024] Synthesis of the compound represented by formula (1):

[0025] Sub-2 (1.04 mmol), Sub-4 (1.45 mmol), triethylamine (3.51 mmol), and methanol (4.56 mmol) were mixed, heated under reflux for 18 h, and column chromatography was performed to obtain the compound represented by formula (1):

[0026] In a preferred embodiment, the antioxidant further comprises a phenolic antioxidant, and the mass ratio of the phenolic antioxidant to the amine antioxidant is 1:(1-2).

[0027] In a preferred embodiment, the phenolic antioxidant is one or more of 2,6-di-tert-butyl-4-methylphenol, butylated hydroxyanisole, and propyl gallate.

[0028] The present invention further defines that the antioxidant also includes the above-mentioned phenolic antioxidant, and the above-mentioned phenolic antioxidant can synergistically improve the antioxidant performance of the lubricating oil with the compound shown in formula (1) obtained by the present invention. The antioxidant mechanism of the compound shown in formula (1) of the present invention is complementary to the antioxidant mechanism of the phenolic system. The antioxidant mechanism of the compound shown in formula (1) is as described above, and the hydrogen atoms on the phenolic hydroxyl group on the phenolic antioxidant are relatively active. When encountering free radicals, the phenolic hydroxyl group can provide hydrogen atoms and form relatively stable phenoloxy free radicals by itself. This process interrupts the chain reaction of oxidation because the generated phenoloxy free radicals are relatively stable and will not easily trigger new oxidation reactions. In addition, the phenolic antioxidant can also remove free radicals by electron transfer. The phenolic antioxidant molecule transfers electrons to the free radical, and itself is oxidized to phenoloxy cations, and the free radical becomes stable after obtaining electrons. This method can also effectively inhibit the progress of the oxidation reaction. In this way, complementarity is achieved with the above-mentioned antioxidant, and the antioxidant performance of the lubricating oil is further improved.

[0029] In a preferred embodiment, the lubricating oil further comprises an anti-friction agent, and the mass ratio of the anti-friction agent to the mineral oil base oil is (0.5-2):100.

[0030] In a preferred embodiment, the anti-friction agent comprises zinc dialkyl dithiophosphate and molybdenum dialkyl dithiocarbamate, and the mass ratio of the zinc dialkyl dithiophosphate to molybdenum dialkyl dithiocarbamate is 1:1.

[0031] The two composite anti-friction agents defined in the present invention have excellent anti-friction effects in addition to the excellent anti-friction effects brought by themselves, and they can still improve the wear resistance of the lubricating oil of the present invention. The chain terminal of the compound shown in the formula (1) defined in the present invention has a trimethylamine skeleton, and trimethylamine can react with metal ions to form a relatively stable complex. In lubricating oil, metal ions often play a role in catalytic oxidation, and trimethylamine can reduce the catalytic activity of metal ions by complexing metal ions, thereby indirectly playing an antioxidant role. Although the anti-friction agent added in the present application has an excellent anti-friction effect, the zinc ions and molybdenum ions generated by its decomposition will catalyze the oxidation reaction. Although the molybdenum ions may react with the peroxide in the lubricating oil to change the path of the oxidation reaction and play an antioxidant role to a certain extent, its main catalytic effect is still a problem that needs to be solved urgently. The compound shown in the formula (1) defined in the present invention just solves this problem, avoids unnecessary chemical reactions, and indirectly promotes its anti-friction effect.

[0032] In a preferred embodiment, the mineral oil base oil includes a mineral oil base oil with a viscosity coefficient of 100-110 and a mineral oil base oil with a viscosity coefficient of 110-130 in a mass ratio of 1:1.

[0033] The above-mentioned mineral oil base oil in the present invention has a high viscosity coefficient, which leads to limited effect of common anti-oxidation performance. For example, the acidic substances, peroxides and other oxidation products produced by the high viscosity coefficient mineral oil during the oxidation process will catalyze its own oxidation reaction and accelerate the further oxidation of the lubricating oil. In addition, the high viscosity coefficient mineral oil is more likely to undergo oxidation reaction under high temperature environment due to its relatively complex molecular structure and heavy weight, thereby producing more macromolecular oxidation products such as colloids and asphaltene. At this time, the requirements for anti-oxidation and wear resistance are higher. The homemade antioxidant of the present invention not only has extremely high anti-oxidation performance, but also has excellent synergistic effect with the anti-wear agent, which can greatly improve the anti-oxidation and wear resistance to overcome the above-mentioned defects.

[0034] In a preferred embodiment, the lubricating oil also includes an extreme pressure agent, the mass ratio of the extreme pressure agent to the mineral oil base oil is (0.1-1):100, and the extreme pressure agent includes one or more of phosphate ester phosphorus extreme pressure agents, phosphite ester phosphorus extreme pressure agents, acid phosphate ester phosphorus extreme pressure agents, acid phosphite ester phosphorus extreme pressure agents, and organic metal extreme pressure agents.

[0035] In a preferred embodiment, the lubricating oil further includes a detergent dispersant, the mass ratio of the detergent dispersant to the mineral oil base oil is (0.1-1):100, and the detergent dispersant includes one or more of metal sulfonates, metal salicylates, metal phenolates, organic phosphites, organic phosphates, organic metal phosphates, succinimide, benzylamine, succinates, and polyol esters.

[0036] In a second aspect, an embodiment of the present invention provides a method for preparing the above-mentioned high oxidation resistance and wear-resistant lubricating oil, comprising the following steps:

[0037] Antioxidants, antifriction agents, extreme pressure agents and detergent dispersants are added into mineral oil base oil, stirred and mixed to obtain highly antioxidative and antifriction lubricating oil.

[0038] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0039] 1. The compound represented by formula (1) prepared by the present invention has a greatly improved antioxidant property for mineral base oil. In particular, the structure represented by formula (1) defined by the present invention is connected to another dimethylamine skeleton through a diphenylamine skeleton. The hydrogen atoms on the amino group in the diphenylamine molecule are relatively active and can be easily oxidized to generate nitroxide free radicals. This nitroxide free radical can combine with the active free radicals (generated during the oxidation process of the protected material, thereby interrupting the oxidation chain reaction and playing an antioxidant role. When diphenylamine is connected to dimethylamine, a synergistic antioxidant effect will be produced. This is because their antioxidant active sites can cooperate with each other. The compound formed by connecting diphenylamine and dimethylamine can play a role in different oxidation stages. In the early stage of oxidation, the diphenylamine part may first react with the peroxyl radical. As the oxidation process proceeds, the dimethylamine part can then play a role and continue to capture the active free radicals generated subsequently. This relay antioxidant process can more effectively inhibit the oxidation chain reaction, thereby improving the antioxidant performance. And the molecular structure after the two are connected increases the stability of the antioxidant molecule to a certain extent. The mutual connection between diphenylamine and dimethylamine changes the spatial structure of the molecule, which may reduce the consumption of active sites by unnecessary side reactions. In addition, the dimethylamine skeleton is connected to an N-methylpiperidine and trimethylamine. First of all, the steric hindrance generated by this branched structure can make the reaction between the antioxidant and the free radicals It should be more controllable. When the free radical is close to the antioxidant molecule, the larger steric hindrance will hinder its rapid contact and overreaction with the antioxidant active site, making the reaction rate moderate, thereby extending the action time of the antioxidant and continuously exerting the antioxidant effect. In addition, the nitrogen atom in the N-methylpiperidine molecule has a lone pair of electrons, which can provide electrons to the free radical, so that it can form a relatively stable free radical intermediate, thereby interrupting the oxidation chain reaction and achieving the antioxidant effect. In addition, the ring structure of N-methylpiperidine and the presence of methyl groups will produce certain steric hindrance. When it reacts with free radicals to form an intermediate, this steric hindrance can prevent the intermediate from further unnecessary reactions, making it more stable, thereby enhancing the antioxidant performance, and trimethylamine is easily oxidized, and the product generated after its oxidation can accept electrons and be reduced, regenerating trimethylamine, and then participating in the redox process again. Therefore, N-methylpiperidine first reacts with the generated free radicals, and the generated intermediate can then transfer electrons with the product after trimethylamine oxidation, so that the antioxidant effect of the system can be sustained, achieving a cycle, so as to improve the antioxidant performance.

[0040] 2. The present invention further defines that the antioxidant also includes the above-mentioned phenolic antioxidant, which can synergistically improve the antioxidant performance of the lubricating oil with the compound shown in formula (1) obtained by the present invention. The antioxidant mechanism of the compound shown in formula (1) of the present invention is complementary to the antioxidant mechanism of the phenolic system. The antioxidant mechanism of the compound shown in formula (1) is as described above, and the hydrogen atoms on the phenolic hydroxyl group on the phenolic antioxidant are relatively active. When encountering free radicals, the phenolic hydroxyl group can provide hydrogen atoms and form relatively stable phenoloxy free radicals by itself. This process interrupts the chain reaction of oxidation because the generated phenoloxy free radicals are relatively stable and will not easily trigger new oxidation reactions. In addition, the phenolic antioxidant can also remove free radicals by electron transfer. The phenolic antioxidant molecule transfers electrons to the free radical, and itself is oxidized to phenoloxy cations, and the free radical becomes stable after obtaining electrons. This method can also effectively inhibit the progress of the oxidation reaction. In this way, complementarity is achieved with the above-mentioned antioxidant, and the antioxidant performance of the lubricating oil is further improved.

[0041] 3. The two composite antifriction agents defined in the present invention have excellent antifriction effects in addition to their own effects, and can still improve the wear resistance of the lubricating oil of the present invention. The chain terminal of the compound shown in formula (1) defined in the present invention has a trimethylamine skeleton, and trimethylamine can react with metal ions to form a relatively stable complex. In lubricating oils, metal ions often play a role in catalytic oxidation, and trimethylamine can reduce the catalytic activity of metal ions by complexing metal ions, thereby indirectly playing an antioxidant role. Although the antifriction agent added in the present application has excellent antifriction effects, the zinc ions and molybdenum ions generated by its decomposition will catalyze the oxidation reaction. Although the molybdenum ions may react with the peroxides in the lubricating oil to change the path of the oxidation reaction and play an antioxidant role to a certain extent, its main catalytic effect is still a problem that needs to be solved urgently. The compound shown in formula (1) defined in the present invention solves this problem, avoids unnecessary chemical reactions, and indirectly promotes its antifriction effect.

[0042] 4. In the present invention, due to the high viscosity coefficient of the mineral oil base oil, the ordinary anti-oxidation performance is limited. For example, the acidic substances, peroxides and other oxidation products produced by the high viscosity coefficient mineral oil during the oxidation process will catalyze its own oxidation reaction and accelerate the further oxidation of the lubricating oil. In addition, the high viscosity coefficient mineral oil is more likely to undergo oxidation reaction under high temperature environment due to its relatively complex molecular structure and heavy weight, thereby producing more macromolecular oxidation products such as colloids and asphaltene. At this time, the requirements for anti-oxidation and wear resistance are higher. The homemade antioxidant of the present invention not only has extremely high anti-oxidation performance, but also has excellent synergistic effect with the anti-wear agent, which can greatly improve the anti-oxidation and wear resistance to overcome the above defects. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Unless otherwise specified, all reagents used in the present invention are commercially available.

[0045] Example 1

[0046] This embodiment provides a method for preparing a highly anti-oxidative wear-resistant lubricating oil, comprising the following steps:

[0047] In parts by mass, 4 parts of antioxidant, 1 part of zinc dialkyl dithiophosphate and 1 part of molybdenum dialkyl dithiocarbamate, 0.5 part of extreme pressure agent (Dexu DX512) and 0.5 part of detergent dispersant (Aidiko SAKURA LUBE 600) are added to a mixture of 50 parts of a mineral oil base oil with a viscosity coefficient of 110 and 50 parts of a mineral oil base oil with a viscosity coefficient of 130, and stirred and mixed to obtain a highly antioxidant and wear-resistant lubricating oil.

[0048] The antioxidant includes the compound represented by the following formula (1):

[0049] The preparation method of the compound represented by formula (1) is as follows:

[0050] Synthesis of compound Sub-2:

[0051] The raw material Sub-1 (2.56 mmol) was dissolved in a solvent, the mass ratio of Sub-2 to the solvent was 1:4, wherein the solvent included water and tetrahydrofuran, the volume of water and tetrahydrofuran was 1:1, heated to 50°C, the heating time was 2h, cooled after heating, and Sub-2 was obtained by column chromatography with a yield of 78%.

[0052]

[0053] Synthesis of compound Sub-4:

[0054] Under nitrogen atmosphere, the raw material Sub-3 (3.34 mmol) was dissolved in tetrahydrofuran at a mass ratio of 1:5, and heated under reflux for 3 h. After cooling, column chromatography was performed to obtain Sub-4 with a yield of 67%.

[0055]

[0056] Synthesis of the compound represented by formula (1):

[0057] Sub-2 (1.04 mmol), Sub-4 (1.45 mmol), triethylamine (3.51 mmol) and methanol (4.56 mmol) were mixed and heated under reflux for 18 h. After column chromatography, the compound represented by formula (1) was obtained in a yield of 59%.

[0058] Elemental analysis: C 22 H 32 N4, theoretical value: C, 74.96; H, 9.15; N, 15.89; found value: C, 74.99; H, 9.14; N, 15.87. HRMS (ESI) m / z (Μ+H)+: theoretical value: 352.26; found value: 353.23.

[0059] Example 2

[0060] This embodiment provides a method for preparing a highly anti-oxidative wear-resistant lubricating oil, comprising the following steps:

[0061] In parts by mass, 4 parts of antioxidant, 1 part of zinc dialkyl dithiophosphate and 1 part of molybdenum dialkyl dithiocarbamate, 0.5 part of extreme pressure agent (Dexu DX512) and 0.5 part of detergent dispersant (Aidiko SAKURA LUBE 600) are added to a mixture of 50 parts of a mineral oil base oil with a viscosity coefficient of 110 and 50 parts of a mineral oil base oil with a viscosity coefficient of 130, and stirred and mixed to obtain a highly antioxidant and wear-resistant lubricating oil.

[0062] The antioxidant includes 2 parts of the compound represented by the following formula (1) and 2 parts of 2,6-di-tert-butyl-4-methylphenol.

[0063] The preparation method of the compound represented by formula (1) is as follows:

[0064] Synthesis of compound Sub-2:

[0065] The raw material Sub-1 (2.56 mmol) was dissolved in a solvent, the mass ratio of Sub-2 to the solvent was 1:4, wherein the solvent included water and tetrahydrofuran, the volume of water and tetrahydrofuran was 1:1, heated to 50°C, the heating time was 2h, cooled after heating, and Sub-2 was obtained by column chromatography with a yield of 78%.

[0066]

[0067] Synthesis of compound Sub-4:

[0068] Under nitrogen atmosphere, the raw material Sub-3 (3.34 mmol) was dissolved in tetrahydrofuran at a mass ratio of 1:5, and heated under reflux for 3 h. After cooling, column chromatography was performed to obtain Sub-4 with a yield of 67%.

[0069]

[0070] Synthesis of the compound represented by formula (1):

[0071] Sub-2 (1.04 mmol), Sub-4 (1.45 mmol), triethylamine (3.51 mmol) and methanol (4.56 mmol) were mixed and heated under reflux for 18 h. After column chromatography, the compound represented by formula (1) was obtained in a yield of 59%.

[0072] Elemental analysis: C 22 H 32 N4, theoretical value: C, 74.96; H, 9.15; N, 15.89; found value: C, 74.99; H, 9.14; N, 15.87. HRMS (ESI) m / z (Μ+H)+: theoretical value: 352.26; found value: 353.23.

[0073] Comparative Example 1

[0074] The difference between this comparative example and Example 2 is that the antioxidant includes only 4 parts of 2,6-di-tert-butyl-4-methylphenol.

[0075] Comparative Example 2

[0076] The difference between this comparative example and Example 2 is that 2,6-di-tert-butyl-4-methylphenol is replaced by p-phenylenediamine.

[0077] Comparative Example 3

[0078] The difference between this comparative example and Example 2 is that 1 part of zinc dialkyl dithiophosphate and 1 part of molybdenum dialkyl dithiocarbamate are replaced by 2 parts of zinc dialkyl dithiophosphate.

[0079] Comparative Example 4

[0080] The difference between this comparative example and Example 2 is that 1 part of zinc dialkyl dithiophosphate and 1 part of molybdenum dialkyl dithiocarbamate are replaced with 2 parts of molybdenum dialkyl dithiocarbamate.

[0081] Comparative Example 5

[0082] The difference between this comparative example and Example 2 is that 1 part of zinc dialkyl dithiophosphate and 1 part of molybdenum dialkyl dithiocarbamate are replaced by 2 parts of sulfurized lard.

[0083] Comparative Example 6

[0084] The difference between this comparative example and Example 2 is that 1 part of zinc dialkyl dithiophosphate and 1 part of molybdenum dialkyl dithiocarbamate are replaced by 2 parts of trimethyl phosphate.

[0085] Performance Testing

[0086] 1. The lubricating oils prepared in the examples and comparative examples were aged at 150° C. for 12 h and 18 h, and then the yellow value YI was tested. The test results are shown in Table 1.

[0087] The yellow value YI was tested using a Konica Minolta CM-5 spectrophotometer.

[0088] The lubricating oil prepared in the embodiment and the comparative example is added to a container to form a thin oil film. In an oxygen atmosphere, the thin oil film is heated from 40°C to 350°C at a heating rate of 20°C / min to obtain an exothermic curve, i.e., the heat released by the heating and oxidation of the lubricating oil. The inflection point of the exothermic curve is obtained, and the temperature at the inflection point is the initial oxidation temperature. The more the initial oxidation temperature of the lubricating oil with the addition of antioxidant increases, the better the antioxidant performance of the antioxidant is. The results are shown in Table 1.

[0089] The rotary oxygen bomb time of the lubricating oils prepared in the examples and comparative examples was tested with reference to SH / T 0193-2008. The results are shown in Table 1.

[0090] 2. The maximum non-seizure load PB of the lubricating oils prepared in the examples and comparative examples was tested with reference to GB / T 3142. The results are shown in Table 2.

[0091] The wear spot diameters of the lubricating oils prepared in the examples and comparative examples were tested according to ASTM D2272. The results are shown in Table 2.

[0092] Table 1 Performance test results

[0093]

[0094] Table 2 Performance test results

[0095]

[0096]

[0097] From the above performance test results, it can be seen that the antioxidant performance and wear resistance of Examples 1-2 are the best, especially the comprehensive performance of Example 2 is the most outstanding, which is mainly because the homemade antioxidant and the compounded anti-friction agent of the present invention have excellent synergistic effects, which improve the antioxidant performance and wear resistance of the lubricating oil. However, the comparative example is significantly worse than the example in the corresponding performance test because it does not adopt the necessary technical solution, which better proves the irreplaceable nature of the specific technical solution of the present application in achieving technical effects and solving technical problems.

[0098] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A highly anti-oxidative and anti-friction lubricating oil, characterized in that: It includes the following components by mass: 100 parts of mineral oil base oil; 1-5 parts of antioxidants; The antioxidant is an amine antioxidant, and the amine antioxidant has at least a trimethylamine group in its structure.

2. The highly anti-oxidative and anti-friction lubricating oil according to claim 1, characterized in that: The antioxidant further comprises a phenolic antioxidant, and the mass ratio of the phenolic antioxidant to the amine antioxidant is 1:(1-2).

3. The highly anti-oxidative and anti-friction lubricating oil according to claim 2, characterized in that: The phenolic antioxidant is one or more of 2,6-di-tert-butyl-4-methylphenol, butylated hydroxyanisole and propyl gallate.

4. The highly anti-oxidative and anti-friction lubricating oil according to claim 1, characterized in that: The lubricating oil further comprises an anti-friction agent, and the mass ratio of the anti-friction agent to the mineral oil base oil is (0.5-2):

100.

5. The highly anti-oxidative and anti-friction lubricating oil according to claim 4, characterized in that: The anti-friction agent comprises zinc dialkyl dithiophosphate and molybdenum dialkyl dithiocarbamate, and the mass ratio of the zinc dialkyl dithiophosphate to molybdenum dialkyl dithiocarbamate is 1:

1.

6. The highly anti-oxidative and anti-friction lubricating oil according to claim 1, characterized in that: The mineral oil-based base oil includes a mineral oil-based base oil with a viscosity coefficient of 100-110 and a mineral oil-based base oil with a viscosity coefficient of 110-130 at a mass ratio of 1:

1.

7. The highly anti-oxidative and anti-friction lubricating oil according to claim 1, characterized in that: The lubricating oil also includes an extreme pressure agent, the mass ratio of the extreme pressure agent to the mineral oil base oil is (0.1-1):100, and the extreme pressure agent includes one or more of phosphate ester phosphorus extreme pressure agents, phosphite ester phosphorus extreme pressure agents, acid phosphate ester phosphorus extreme pressure agents, acid phosphite ester phosphorus extreme pressure agents, and organic metal extreme pressure agents.

8. The highly anti-oxidative and anti-friction lubricating oil according to claim 1, characterized in that: The lubricating oil further includes a detergent dispersant, and the mass ratio of the detergent dispersant to the mineral oil base oil is (0.1-1):

100.

9. The highly anti-oxidative and anti-friction lubricating oil according to claim 8, characterized in that: The detergent dispersant includes one or more of metal sulfonates, metal salicylates, metal phenolates, organic phosphites, organic phosphates, organic metal phosphates, succinimide, benzylamine, succinates, and polyol esters.

10. A method for preparing a highly anti-oxidative wear-resistant lubricating oil as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Antioxidants, antifriction agents, extreme pressure agents and detergent dispersants are added into mineral oil base oil, stirred and mixed to obtain highly antioxidative and antifriction lubricating oil.

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