阅读说明：本技术 一种高寿命耐用润滑油 (Durable lubricating oil with long service life ) 是由 敬青梅 于 2021-01-21 设计创作，主要内容包括：本发明涉及润滑油生产技术领域,尤其涉及一种高寿命耐用润滑油,该润滑油按质量份计包括以下原料：基础油80～110份、山梨糖醇8～10份、纳米膨润土1～3份、木质素硫酸钠5～7份、聚乙烯醇8～10份、纳米氧化铝1～5份、聚硅氯化铝4～8份、硼酸三异丙酯4～6份、改性氯化钙3～5份和改性抗氧化剂1～3份,且其制备方法,包括以下步骤：S1、将基础油放入反应器中,升温至35℃～40℃,加入纳米膨润土和木质素硫酸钠搅拌均匀；S2、再加入山梨糖醇、聚乙烯醇、纳米氧化铝、聚硅氯化铝和硼酸三异丙酯继续搅拌5～15min。本发明不仅能够对该润滑油的抗冻能力进行改善提高,而且还能优化其抗氧化的性能,从而能够显著地延长该润滑油的寿命及耐用性。(The invention relates to the technical field of lubricating oil production, in particular to long-life durable lubricating oil which comprises the following raw materials in parts by mass: 80-110 parts of base oil, 8-10 parts of sorbitol, 1-3 parts of nano bentonite, 5-7 parts of sodium lignin sulfate, 8-10 parts of polyvinyl alcohol, 1-5 parts of nano alumina, 4-8 parts of polyaluminum silicate chloride, 4-6 parts of triisopropyl borate, 3-5 parts of modified calcium chloride and 1-3 parts of modified antioxidant, and the preparation method comprises the following steps: s1, putting the base oil into a reactor, heating to 35-40 ℃, adding the nano bentonite and the sodium lignin sulfate, and stirring uniformly; and S2, adding sorbitol, polyvinyl alcohol, nano aluminum oxide, aluminum polychloride and triisopropyl borate, and continuously stirring for 5-15 min. The invention not only can improve the freezing resistance of the lubricating oil, but also can optimize the oxidation resistance of the lubricating oil, thereby obviously prolonging the service life and the durability of the lubricating oil.)

1. The long-life durable lubricating oil is characterized by comprising the following raw materials in parts by mass: 80-110 parts of base oil, 8-10 parts of sorbitol, 1-3 parts of nano bentonite, 5-7 parts of sodium lignin sulfate, 8-10 parts of polyvinyl alcohol, 1-5 parts of nano alumina, 4-8 parts of polyaluminum silicate chloride, 4-6 parts of triisopropyl borate, 3-5 parts of modified calcium chloride and 1-3 parts of modified antioxidant.

2. The long-life durable lubricating oil of claim 1, wherein the modified calcium chloride is prepared from calcium chloride and ethylene glycol as raw materials, 1-ethanol-3-methylimidazole bistrifluoromethylsulfimide as a modifier and a silane coupling agent KH550 as an auxiliary agent.

3. The long-life durable lubricating oil according to claim 2, wherein the 1-ethanol-based-3-methylimidazole bistrifluoromethylsulfonyl imide is prepared by the following method: dissolving 100g of intermediate [ EOHMIN ] [ Cl ] in 35mL of distilled water, adding bis (trifluoromethyl) sulfonyl imide lithium with the same molar mass into the distilled water, stirring the mixture at room temperature for 3 hours, standing the mixture, and taking a lower layer of colorless transparent liquid after layering to obtain the ionic liquid 1-ethanol-based-3-methylimidazole bis (trifluoromethyl) sulfonyl imide.

4. The long-life durable lubricating oil according to claim 2, wherein the modified calcium chloride is prepared by the following method: pouring calcium chloride and ethylene glycol into a vessel, mixing, adding 1-ethanol-based-3-methylimidazole bistrifluoromethylsulfonyl imide and a silane coupling agent KH550, stirring to mix uniformly, and heating in a water bath at 85 ℃ for 15min to obtain the modified calcium chloride.

5. The long-life durable lubricating oil of claim 1, wherein the modified antioxidant is prepared from BHA and BHT as raw materials, and polytetrafluoroethylene fiber and a silane coupling agent KH550 as additives.

6. The long-life durable lubricating oil of claim 5, wherein the modified antioxidant is prepared by: mixing and adding a silane coupling agent KH550 and polytetrafluoroethylene fibers into BHA and BHT, mixing and stirring until the mixture is completely fused, and then heating the mixture in water bath at the temperature of 150 ℃ for 15min to obtain the modified antioxidant.

7. The preparation method of the long-life durable lubricating oil is characterized by comprising the following steps of:

s1, putting the base oil into a reactor, heating to 35-40 ℃, adding the nano bentonite and the sodium lignin sulfate, and stirring uniformly;

s2, adding sorbitol, polyvinyl alcohol, nano aluminum oxide, poly-silicon aluminum chloride and triisopropyl borate, and continuously stirring for 5-15 min;

and S3, sequentially adding the modified calcium chloride and the modified antioxidant, heating to 60-70 ℃, uniformly stirring for 30-50 min, finally adding the poly-silicon aluminum chloride, continuously stirring for 15-20 min, and standing to obtain the lubricating oil.

8. The method of claim 7, wherein the mass ratio of the poly aluminum chloride added in S2 and S3 is 1: 1.

Technical Field

The invention relates to the technical field of lubricating oil production, in particular to long-life durable lubricating oil.

Background

The lubricating oil is a liquid or semisolid lubricating agent used on various types of automobiles and mechanical equipment to reduce friction and protect machines and workpieces, and mainly plays roles in lubrication, auxiliary cooling, rust prevention, cleaning, sealing, buffering and the like. The lubricating oil is used between two objects moving relatively to reduce friction and wear caused by the contact between the two objects.

The existing lubricating oil may have some quality problems, so that the service life of the lubricating oil is short, the lubricating oil is not durable, for example, the lubricating oil is easy to freeze under low-temperature environment, the use and the use effect are influenced, and the anti-oxidation performance of the lubricating oil is attenuated under certain high-temperature environment, and certain influence is also caused on the effect.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides lubricating oil with long service life and durability.

In order to achieve the purpose, the invention adopts the following technical scheme:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 80-110 parts of base oil, 8-10 parts of sorbitol, 1-3 parts of nano bentonite, 5-7 parts of sodium lignin sulfate, 8-10 parts of polyvinyl alcohol, 1-5 parts of nano alumina, 4-8 parts of polyaluminum silicate chloride, 4-6 parts of triisopropyl borate, 3-5 parts of modified calcium chloride and 1-3 parts of modified antioxidant.

Preferably, the modified calcium chloride is prepared by taking calcium chloride and ethylene glycol as raw materials, 1-ethanol-3-methylimidazole bistrifluoromethylsulfonyl imide as a modifier and a silane coupling agent KH550 as an auxiliary agent.

Preferably, the preparation method of the 1-ethanol-based-3-methylimidazole bis (trifluoromethyl) sulfonyl imide comprises the following steps: dissolving 100g of intermediate [ EOHMIN ] [ Cl ] in 35mL of distilled water, adding bis (trifluoromethyl) sulfonyl imide lithium with the same molar mass into the distilled water, stirring the mixture at room temperature for 3 hours, standing the mixture, and taking a lower layer of colorless transparent liquid after layering to obtain the ionic liquid 1-ethanol-based-3-methylimidazole bis (trifluoromethyl) sulfonyl imide.

Preferably, the preparation method of the modified calcium chloride comprises the following steps: pouring calcium chloride and ethylene glycol into a vessel, mixing, adding 1-ethanol-based-3-methylimidazole bistrifluoromethylsulfonyl imide and a silane coupling agent KH550, stirring to mix uniformly, and heating in a water bath at 85 ℃ for 15min to obtain the modified calcium chloride.

Preferably, the modified antioxidant is prepared by taking BHA and BHT as raw materials and polytetrafluoroethylene fiber and a silane coupling agent KH550 as an addition auxiliary agent.

Preferably, the preparation method of the modified antioxidant comprises the following steps: mixing and adding a silane coupling agent KH550 and polytetrafluoroethylene fibers into BHA and BHT, mixing and stirring until the mixture is completely fused, and then heating the mixture in water bath at the temperature of 150 ℃ for 15min to obtain the modified antioxidant.

A preparation method of a long-life durable lubricating oil comprises the following steps:

s1, putting the base oil into a reactor, heating to 35-40 ℃, adding the nano bentonite and the sodium lignin sulfate, and stirring uniformly;

s2, adding sorbitol, polyvinyl alcohol, nano aluminum oxide, poly-silicon aluminum chloride and triisopropyl borate, and continuously stirring for 5-15 min;

and S3, sequentially adding the modified calcium chloride and the modified antioxidant, heating to 60-70 ℃, uniformly stirring for 30-50 min, finally adding the poly-silicon aluminum chloride, continuously stirring for 15-20 min, and standing to obtain the lubricating oil.

Preferably, the mass ratio of the added aluminum polysilicate chloride in the S2 and the S3 is 1: 1.

The invention has the beneficial effects that:

1. according to the invention, calcium chloride is modified and compounded, and ethylene glycol and 1-ethanol-3-methylimidazole bis (trifluoromethyl) sulfonyl imide are added, so that the hydrophobic property of the lubricating oil can be improved, and the freezing resistance of the lubricating oil is improved.

2. According to the invention, BHA and BHT are modified and compounded, and polytetrafluoroethylene fiber is added, so that the finally prepared lubricating oil can further improve the oxidation resistance under a high-temperature environment.

In conclusion, the invention not only can improve the freezing resistance of the lubricating oil, but also can optimize the oxidation resistance of the lubricating oil, thereby obviously prolonging the service life and the durability of the lubricating oil.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.

A long-life durable lubricating oil comprises the following raw materials in parts by mass: 80-110 parts of base oil, 8-10 parts of sorbitol, 1-3 parts of nano bentonite, 5-7 parts of sodium lignin sulfate, 8-10 parts of polyvinyl alcohol, 1-5 parts of nano alumina, 4-8 parts of polyaluminum silicate chloride, 4-6 parts of triisopropyl borate, 3-5 parts of modified calcium chloride and 1-3 parts of modified antioxidant.

The modified calcium chloride is prepared by taking calcium chloride and ethylene glycol as raw materials, 1-ethanol-based-3-methylimidazole bistrifluoromethylsulfonyl imide as a modifier and a silane coupling agent KH550 as an auxiliary agent, and the preparation method of the modified calcium chloride comprises the following steps: pouring calcium chloride and ethylene glycol into a vessel, mixing, adding 1-ethanol-based-3-methylimidazole bistrifluoromethylsulfonyl imide and a silane coupling agent KH550, stirring to mix uniformly, and heating in a water bath at 85 ℃ for 15min to obtain the modified calcium chloride.

The preparation method of the 1-ethanol-based-3-methylimidazole bistrifluoromethylsulfonyl imide comprises the following steps: dissolving 100g of intermediate [ EOHMIN ] [ Cl ] in 35mL of distilled water, adding bis (trifluoromethyl) sulfonyl imide lithium with the same molar mass into the distilled water, stirring the mixture at room temperature for 3 hours, standing the mixture, and taking a lower layer of colorless transparent liquid after layering to obtain the ionic liquid 1-ethanol-based-3-methylimidazole bis (trifluoromethyl) sulfonyl imide.

The modified antioxidant is prepared by taking BHA and BHT as raw materials and polytetrafluoroethylene fiber and a silane coupling agent KH550 as an addition auxiliary agent, and the preparation method of the modified antioxidant comprises the following steps: mixing and adding a silane coupling agent KH550 and polytetrafluoroethylene fibers into BHA and BHT, mixing and stirring until the mixture is completely fused, and then heating the mixture in water bath at the temperature of 150 ℃ for 15min to obtain the modified antioxidant.

A preparation method of a long-life durable lubricating oil comprises the following steps:

s1, putting the base oil into a reactor, heating to 40 ℃, adding the nano bentonite and the sodium lignin sulfate, and stirring uniformly;

s2, adding sorbitol, polyvinyl alcohol, nano alumina, 1/2 parts of polyaluminum silicate chloride and triisopropyl borate, and continuously stirring for 15 min;

s3, sequentially adding modified calcium chloride and a modified antioxidant, heating to 65 ℃, uniformly stirring for 35min, finally adding 1/2 parts of polysilicate aluminum chloride, continuously stirring for 15min, and standing to obtain the lubricating oil.

The first embodiment is as follows:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 80 parts of base oil, 8 parts of sorbitol, 1 part of nano bentonite, 5 parts of sodium lignin sulfate, 8 parts of polyvinyl alcohol, 1 part of nano alumina, 4 parts of polysilicone aluminum chloride, 4 parts of triisopropyl borate, 3 parts of modified calcium chloride and 1 part of modified antioxidant.

Example two:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 95 parts of base oil, 9 parts of sorbitol, 2 parts of nano bentonite, 6 parts of sodium lignin sulfate, 9 parts of polyvinyl alcohol, 3 parts of nano alumina, 6 parts of polysilicone aluminum chloride, 5 parts of triisopropyl borate, 4 parts of modified calcium chloride and 2 parts of modified antioxidant.

Example three:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 110 parts of base oil, 10 parts of sorbitol, 3 parts of nano bentonite, 7 parts of sodium lignin sulfate, 10 parts of polyvinyl alcohol, 5 parts of nano alumina, 8 parts of polysilicone aluminum chloride, 6 parts of triisopropyl borate, 5 parts of modified calcium chloride and 3 parts of modified antioxidant.

Example four:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 90 parts of base oil, 10 parts of sorbitol, 1.5 parts of nano bentonite, 5.5 parts of sodium lignin sulfate, 8 parts of polyvinyl alcohol, 4 parts of nano alumina, 6 parts of polysilicate aluminum chloride, 5 parts of triisopropyl borate, 4 parts of modified calcium chloride and 2 parts of modified antioxidant.

Example five:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 100 parts of base oil, 9 parts of sorbitol, 2.5 parts of nano bentonite, 6.5 parts of sodium lignin sulfate, 9 parts of polyvinyl alcohol, 2 parts of nano alumina, 6 parts of polysilicone aluminum chloride, 5.5 parts of triisopropyl borate, 4 parts of modified calcium chloride and 2.5 parts of modified antioxidant.

Example six:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 80 parts of base oil, 10 parts of sorbitol, 3 parts of nano bentonite, 7 parts of sodium lignin sulfate, 10 parts of polyvinyl alcohol, 5 parts of nano alumina, 8 parts of polysilicone aluminum chloride, 6 parts of triisopropyl borate, 5 parts of modified calcium chloride and 3 parts of modified antioxidant.

The first to sixth examples were all prepared by the following procedure:

s1, putting the base oil into a reactor, heating to 40 ℃, adding the nano bentonite and the sodium lignin sulfate, and stirring uniformly;

s2, adding sorbitol, polyvinyl alcohol, nano alumina, 1/2 parts of polyaluminum silicate chloride and triisopropyl borate, and continuously stirring for 15 min;

s3, sequentially adding modified calcium chloride and a modified antioxidant, heating to 65 ℃, uniformly stirring for 35min, finally adding 1/2 parts of polysilicate aluminum chloride, continuously stirring for 15min, and standing to obtain the lubricating oil.

Test one: measurement of anti-freezing ability of lubricating oil

Comparative example one:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 80 parts of base oil, 8 parts of sorbitol, 1 part of nano bentonite, 5 parts of sodium lignin sulfate, 8 parts of polyvinyl alcohol, 1 part of nano alumina, 4 parts of polyaluminum silicate chloride, 4 parts of triisopropyl borate and 1 part of modified antioxidant.

Comparative example two:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 95 parts of base oil, 9 parts of sorbitol, 2 parts of nano bentonite, 6 parts of sodium lignin sulfate, 9 parts of polyvinyl alcohol, 3 parts of nano alumina, 6 parts of polyaluminum silicate chloride, 5 parts of triisopropyl borate and 2 parts of modified antioxidant.

Comparative example three:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 110 parts of base oil, 10 parts of sorbitol, 3 parts of nano bentonite, 7 parts of sodium lignin sulfate, 10 parts of polyvinyl alcohol, 5 parts of nano alumina, 8 parts of polyaluminum silicate chloride, 6 parts of triisopropyl borate and 3 parts of modified antioxidant.

The above comparative examples one to three were each prepared by the following procedure:

s1, putting the base oil into a reactor, heating to 40 ℃, adding the nano bentonite and the sodium lignin sulfate, and stirring uniformly;

s2, adding sorbitol, polyvinyl alcohol, nano alumina, 1/2 parts of polyaluminum silicate chloride and triisopropyl borate, and continuously stirring for 15 min;

and S3, sequentially adding the modified antioxidants, heating to 65 ℃, uniformly stirring for 35min, finally adding 1/2 parts of polysilicate aluminum chloride, continuously stirring for 15min, and standing to obtain the lubricating oil.

Reference example one:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 80 parts of base oil, 8 parts of sorbitol, 1 part of nano bentonite, 5 parts of sodium lignin sulfate, 8 parts of polyvinyl alcohol, 1 part of nano alumina, 4 parts of polysilicate aluminum chloride, 4 parts of triisopropyl borate, 3 parts of calcium chloride and 1 part of modified antioxidant.

Reference example two:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 95 parts of base oil, 9 parts of sorbitol, 2 parts of nano bentonite, 6 parts of sodium lignin sulfate, 9 parts of polyvinyl alcohol, 3 parts of nano alumina, 6 parts of polysilicate aluminum chloride, 5 parts of triisopropyl borate, 4 parts of calcium chloride and 2 parts of modified antioxidant.

Reference example three:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 110 parts of base oil, 10 parts of sorbitol, 3 parts of nano bentonite, 7 parts of sodium lignin sulfate, 10 parts of polyvinyl alcohol, 5 parts of nano alumina, 8 parts of polysilicate aluminum chloride, 6 parts of triisopropyl borate, 5 parts of calcium chloride and 3 parts of modified antioxidant.

In the first to third reference examples, the modified calcium chloride was replaced by calcium chloride, and the specific preparation process was as follows:

s1, putting the base oil into a reactor, heating to 40 ℃, adding the nano bentonite and the sodium lignin sulfate, and stirring uniformly;

s2, adding sorbitol, polyvinyl alcohol, nano alumina, 1/2 parts of polyaluminum silicate chloride and triisopropyl borate, and continuously stirring for 15 min;

s3, sequentially adding calcium chloride and a modified antioxidant, heating to 65 ℃, uniformly stirring for 35min, finally adding 1/2 parts of polysilicate aluminum chloride, continuously stirring for 15min, and standing to obtain the lubricating oil.

Taking the lubricating oils of the above examples one to six, comparative examples one to three and reference examples one to three, according to the detection method of GB/T3535-83, after preheating the sample (i.e., the lubricating oil), cooling the sample at a prescribed speed, checking the fluidity of the sample at intervals of 3 ℃, and determining the lowest temperature at which the sample can flow as the pour point; further, according to the detection method of GB/T51083, a sample (i.e., lubricating oil) was put into a predetermined test tube, and cooled to a predetermined temperature, whether or not the liquid surface flowed was observed by inclining the test tube at 45 degrees through LMIN, and the highest temperature at which the liquid surface did not flow in the test tube was defined as the freezing point, and the respective sets of data were recorded in Table 1.

TABLE 1

As can be seen from the data in Table 1, the pour point temperature of the lubricating oil is, from large to small, that is, the freezing resistance of the lubricating oil in the examples is strongest and the freezing resistance is least easy to freeze, which indicates that the freezing resistance of the lubricating oil can be effectively improved by the modified calcium chloride.

And (2) test II: measurement of antioxidant ability of lubricating oil

Comparative example four:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 80 parts of base oil, 8 parts of sorbitol, 1 part of nano bentonite, 5 parts of sodium lignin sulfate, 8 parts of polyvinyl alcohol, 1 part of nano alumina, 4 parts of polysilicate aluminum chloride, 4 parts of triisopropyl borate and 3 parts of modified calcium chloride.

Comparative example five:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 95 parts of base oil, 9 parts of sorbitol, 2 parts of nano bentonite, 6 parts of sodium lignin sulfate, 9 parts of polyvinyl alcohol, 3 parts of nano alumina, 6 parts of polysilicate aluminum chloride, 5 parts of triisopropyl borate and 4 parts of modified calcium chloride.

Comparative example six:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 110 parts of base oil, 10 parts of sorbitol, 3 parts of nano bentonite, 7 parts of sodium lignin sulfate, 10 parts of polyvinyl alcohol, 5 parts of nano alumina, 8 parts of polysilicate aluminum chloride, 6 parts of triisopropyl borate and 5 parts of modified calcium chloride.

The lubricating oil was prepared according to the following procedure for each of the above comparative examples four to six:

s1, putting the base oil into a reactor, heating to 40 ℃, adding the nano bentonite and the sodium lignin sulfate, and stirring uniformly;

s2, adding sorbitol, polyvinyl alcohol, nano alumina, 1/2 parts of polyaluminum silicate chloride and triisopropyl borate, and continuously stirring for 15 min;

and S3, sequentially adding the modified calcium chloride, heating to 65 ℃, uniformly stirring for 35min, finally adding 1/2 parts of polysilicate aluminum chloride, continuously stirring for 15min, and standing to obtain the lubricating oil.

Reference example four:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 80 parts of base oil, 8 parts of sorbitol, 1 part of nano bentonite, 5 parts of sodium lignin sulfate, 8 parts of polyvinyl alcohol, 1 part of nano alumina, 4 parts of polysilicate aluminum chloride, 4 parts of triisopropyl borate, 3 parts of modified calcium chloride and 1 part of antioxidant.

Reference example five:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 95 parts of base oil, 9 parts of sorbitol, 2 parts of nano bentonite, 6 parts of sodium lignin sulfate, 9 parts of polyvinyl alcohol, 3 parts of nano alumina, 6 parts of polysilicone aluminum chloride, 5 parts of triisopropyl borate, 4 parts of modified calcium chloride and 2 parts of antioxidant.

Reference example six:

a long-life durable lubricating oil comprises the following raw materials in parts by mass: 110 parts of base oil, 10 parts of sorbitol, 3 parts of nano bentonite, 7 parts of sodium lignin sulfate, 10 parts of polyvinyl alcohol, 5 parts of nano alumina, 8 parts of polysilicone aluminum chloride, 6 parts of triisopropyl borate, 5 parts of modified calcium chloride and 3 parts of antioxidant.

In the fourth to sixth reference examples, the antioxidant (BHA + BHT mixture) was used instead of the modified antioxidant, and the specific preparation process was as follows:

s1, putting the base oil into a reactor, heating to 40 ℃, adding the nano bentonite and the sodium lignin sulfate, and stirring uniformly;

s2, adding sorbitol, polyvinyl alcohol, nano alumina, 1/2 parts of polyaluminum silicate chloride and triisopropyl borate, and continuously stirring for 15 min;

s3, sequentially adding the modified calcium chloride and the antioxidant, heating to 65 ℃, uniformly stirring for 35min, finally adding 1/2 parts of polysilicate aluminum chloride, continuously stirring for 15min, and standing to obtain the lubricating oil.

The lubricating oils of the above examples one to six, comparative examples four to six and reference examples four to six were measured for their oxidation stability at different oil bath temperatures (unit:. degree. C.) by a full-automatic rotary oxygen bomb tester according to the national standard SH/T0193 "method for measuring oxidation stability of lubricating oils", and the bomb oxygen test time (unit: min.) was recorded in Table 2.

TABLE 2

As is apparent from the data in Table 2, the oxidation stability of the lubricating oils in the examples is the best, followed by the lubricating oils in the reference examples, and the worst is the lubricating oil in the comparative example, and it has been found that the elasto-oxygen test time of the lubricating oils in the reference examples and the comparative example is drastically reduced when the oil bath temperature exceeds a certain value, while the elasto-oxygen test time of the lubricating oils in the examples is still stable, wherein the elasto-oxygen test time in the sixth example is always close to 40min, and is excellent, whereby it can be seen that the modified antioxidant can improve its antioxidant property in a high-temperature environment.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.