CN117903864A - A high-performance special synthetic lubricant and preparation method thereof - Google Patents

Abstract

A high-performance special synthetic lubricating oil and a preparation method thereof belong to the technical field of lubricating oil preparation. In order to improve the oxidation resistance and the wear resistance of lubricating oil, the invention is mainly prepared from base oil, high-temperature antioxidant, antiwear agent, dispersant, pour point depressant and viscosity index improver, wherein the mass ratio of the base oil, the high-temperature antioxidant, the antiwear agent, the dispersant, the pour point depressant to the viscosity index improver is (50-60): 3-5): 1-3): 1-2.5: 2-4, and the high-temperature antioxidant is octyl butyl diphenylamine; the antiwear agent is iminodibenzyl. The invention can obviously improve the wear resistance and oxidation stability of the lubricating oil, and the prepared lubricating oil has excellent lubricating performance and viscosity-temperature characteristics.

Description

A high-performance special synthetic lubricant and preparation method thereof

Technical Field

The invention belongs to the technical field of lubricating oil preparation, and in particular relates to a high-performance special synthetic lubricating oil and a preparation method thereof.

Background technique

During the operation of the equipment, in order to prevent the mechanical equipment from being easily damaged when operating at high and low temperatures, lubricating oil is needed to lubricate the key moving parts. The moving parts of mechanical equipment are basically made of metal materials. When the mechanical equipment is overloaded or operating in cold weather, a large amount of water vapor is easily generated inside the lubricating oil, which combines with the lubricating oil to produce acidic liquid, which easily makes the lubricating oil darker in color. This is a phenomenon of lubricating oil oxidation, shortening the service life of the lubricating oil in the equipment. The darkening of the color of the lubricating oil is a phenomenon of lubricating oil deterioration, and it is also easy to cause equipment wear.

In order to extend the service life of lubricants and prevent equipment wear, the requirements for the wear resistance and oxidation stability of the lubricants used are constantly increasing. Although the commercially available lubricants with good wear resistance and oxidation stability have certain wear and oxidation resistance, they do not have long-term anti-oxidation and anti-wear effects, and it is difficult to meet the long-term anti-oxidation and anti-wear requirements of lubricants.

Summary of the invention

The problem to be solved by the present invention is to improve the anti-oxidation performance and anti-wear performance of lubricating oil, and a high-performance special synthetic lubricating oil and a preparation method thereof are provided.

To achieve the above object, the present invention is implemented through the following technical solutions:

A high-performance special synthetic lubricant, wherein the high-performance special synthetic lubricant is mainly made of base oil, high-temperature antioxidant, antiwear agent, dispersant, pour point depressant, and viscosity index improver, wherein the mass ratio of the base oil, high-temperature antioxidant, antiwear agent, dispersant, pour point depressant, and viscosity index improver is (50-60):(3-5):(1-3):(1-2.5):(1-2.5):(2-4);

The high temperature antioxidant is octylbutyl diphenylamine; the anti-wear agent is iminodibenzyl.

Furthermore, the base oil is any one of synthetic base oil and biological base oil or a combination of several of them.

Furthermore, the base oil is a mixture of PAO synthetic base oil and polyol ester in any proportion.

Furthermore, the dispersant is one of isostearic acid monoglyceride, sorbitan monopalmitate, sorbitan palmitate, sorbitan hexadecanoate, Span 40, and sorbitan monolaurate.

Furthermore, the pour point depressant is a composite pour point depressant polymer, which is a PMA polymethacrylate pour point depressant, and is made from 2-hydroxy-6-(4-hydroxy-2-methoxy-6-methoxycarbonylphenoxy)-4-methylbenzoic acid methyl ester.

Furthermore, the viscosity index improver is ethylene propylene diene monomer (EPDM), and the third monomer of the EPDM is one of 7-octadiene, 6,10-dimethyl-1,5,9-undecatriene, 3,7-dimethyl-1,6-octadiene, and 5,7-dimethyl-1.

A method for preparing a high-performance special synthetic lubricant comprises the following steps:

S1. Weigh the base oil, high temperature antioxidant, antiwear agent, dispersant, pour point depressant, and viscosity index improver according to the mass ratio and set aside;

S2. The base oil is added to the reactor and heated to 60 ℃ ~ 80 ℃, and a high temperature antioxidant is added while stirring to obtain a first mixture;

S3. Continue heating to raise the temperature of the first mixture obtained in step S2 to 95°C to 110°C, stir for 55min to 65min, then cool to 80°C to 90°C, add antiwear agent while stirring, stir for 30min to 40min, cool to 60°C to 70°C, then add dispersant, pour point depressant, viscosity index improver, stir for 30min to 40min, and cool to room temperature to obtain high-performance special synthetic lubricating oil.

Furthermore, the stirring speed in step S2 is 30 r/min to 50 r/min.

Furthermore, the stirring speed in step S3 is 30 r/min to 50 r/min.

Beneficial effects of the present invention:

The high-performance special synthetic lubricating oil described in the present invention can significantly improve the anti-wear performance and oxidation stability of the lubricating oil, and the prepared lubricating oil has excellent lubricating performance and viscosity-temperature characteristics.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail in the following specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the specific embodiments described are only part of the embodiments of the present invention, rather than all the specific embodiments. The present invention may also have other embodiments.

Therefore, the following detailed description of the specific embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents the selected specific embodiments of the present invention. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

In order to further understand the content, features and effects of the present invention, the following specific embodiments are described in detail as follows:

Specific implementation method one:

A method for preparing a high-performance special synthetic lubricant comprises the following steps: adding 500 g of base oil into a reaction kettle and heating it to 60° C., and adding 30 g of a high-temperature antioxidant and 20 g of an anti-wear agent while stirring to obtain a first mixture;

Continue heating to 95°C, stir for 60 minutes, cool to 40°C, add 10g dispersant, 10g pour point depressant, 20g viscosity index improver, stir evenly to obtain high-performance special synthetic lubricating oil;

Furthermore, the base oil is a PAO synthetic base oil;

Furthermore, the high temperature antioxidant is octylbutyl diphenylamine; the anti-wear agent is iminodibenzyl;

Further, the dispersant is isostearic acid monoglyceride;

Further, the pour point depressant is a composite pour point depressant polymer, which is a PMA polymethacrylate pour point depressant, made from 2-hydroxy-6-(4-hydroxy-2-methoxy-6-methoxycarbonylphenoxy)-4-methylbenzoic acid methyl ester;

Furthermore, the viscosity index improver is ethylene propylene diene monomer (EPDM), and the third monomer of the EPDM is 7-octadiene.

Furthermore, the stirring speed is 30 r/min.

Specific implementation method 2:

A method for preparing a high-performance special synthetic lubricant comprises the following steps: adding 600g of base oil into a reaction kettle, heating to 70°C, and adding 25g of a high-temperature antioxidant and 15g of an anti-wear agent while stirring to obtain a first mixture; continuing to heat to 100°C, stirring for 50 minutes, cooling to 50°C, adding 20g of a dispersant, 15g of a pour point depressant, and 30g of a viscosity index improver, and stirring evenly to obtain a high-performance special synthetic lubricant;

Furthermore, the base oil is PAO synthetic base oil.

Furthermore, the high temperature antioxidant is octylbutyl diphenylamine; the anti-wear agent is iminodibenzyl;

Further, the dispersant is isostearic acid monoglyceride;

Further, the pour point depressant is a composite pour point depressant polymer, which is a PMA polymethacrylate pour point depressant, made from 2-hydroxy-6-(4-hydroxy-2-methoxy-6-methoxycarbonylphenoxy)-4-methylbenzoic acid methyl ester;

Furthermore, the viscosity index improver is ethylene propylene diene monomer (EPDM), and the third monomer of the EPDM is 6,10-dimethyl-1,5,9-undecatriene.

Furthermore, the stirring speed is 50 r/min.

Specific implementation method three:

A method for preparing a high-performance special synthetic lubricant comprises the following steps: adding 550 g of base oil into a reaction kettle, heating to 70° C., adding 50 g of a high-temperature antioxidant and 30 g of an anti-wear agent while stirring to obtain a first mixture; continuing to heat to 110° C., stirring for 50 min, cooling to 50° C., adding 25 g of a dispersant, 20 g of a pour point depressant, and 35 g of a viscosity index improver, and stirring evenly to obtain the high-performance special synthetic lubricant.

Furthermore, the base oil is PAO synthetic base oil.

Furthermore, the high temperature antioxidant is octylbutyl diphenylamine; the anti-wear agent is iminodibenzyl;

Further, the dispersant is isostearic acid monoglyceride;

Further, the pour point depressant is a composite pour point depressant polymer, which is a PMA polymethacrylate pour point depressant, made from 2-hydroxy-6-(4-hydroxy-2-methoxy-6-methoxycarbonylphenoxy)-4-methylbenzoic acid methyl ester;

Furthermore, the viscosity index improver is ethylene propylene diene monomer (EPDM), and the third monomer of the EPDM is 9-undecatriene.

Furthermore, the stirring speed is 40 r/min.

Specific implementation method four:

A method for preparing a high-performance special synthetic lubricant comprises the following steps: adding 580 g of base oil into a reaction kettle, heating to 70° C., adding 40 g of a high-temperature antioxidant and 25 g of an anti-wear agent while stirring to obtain a first mixture; continuing to heat to 115° C., stirring for 50 min, cooling to 50° C., adding 22 g of a dispersant, 25 g of a pour point depressant, and 40 g of a viscosity index improver, and stirring evenly to obtain the high-performance special synthetic lubricant.

Furthermore, the base oil is PAO synthetic base oil.

Furthermore, the high temperature antioxidant is octylbutyl diphenylamine; the anti-wear agent is iminodibenzyl;

Further, the dispersant is isostearic acid monoglyceride;

Further, the pour point depressant is a composite pour point depressant polymer, which is a PMA polymethacrylate pour point depressant, made from 2-hydroxy-6-(4-hydroxy-2-methoxy-6-methoxycarbonylphenoxy)-4-methylbenzoic acid methyl ester;

Furthermore, the viscosity index improver is ethylene propylene diene monomer (EPDM), and the third monomer of the EPDM is 5,7-dimethyl-1.

Furthermore, the stirring speed is 30 r/min to 50 r/min.

Specific implementation method five:

A method for preparing a high-performance special synthetic lubricant comprises the following steps: adding 560g of base oil into a reaction kettle, heating to 80°C, and adding 35g of a high-temperature antioxidant and 22g of an anti-wear agent while stirring to obtain a first mixture; continuing to heat to 110°C, stirring for 60 minutes, cooling to 40°C, adding 18g of a dispersant, 16g of a pour point depressant, and 25g of a viscosity index improver, and stirring evenly to obtain a high-performance special synthetic lubricant.

Furthermore, the base oil is PAO synthetic base oil.

Furthermore, the high temperature antioxidant is octylbutyl diphenylamine; the anti-wear agent is iminodibenzyl;

Further, the dispersant is isostearic acid monoglyceride;

Further, the pour point depressant is a composite pour point depressant polymer, which is a PMA polymethacrylate pour point depressant, made from 2-hydroxy-6-(4-hydroxy-2-methoxy-6-methoxycarbonylphenoxy)-4-methylbenzoic acid methyl ester;

Furthermore, the viscosity index improver is ethylene propylene diene monomer (EPDM), and the third monomer of the EPDM is 3,7-dimethyl-1,6-octadiene.

Furthermore, the stirring speed is 30 r/min.

In order to further illustrate the performance of the high-performance special synthetic lubricating oil prepared by the preparation method of the high-performance special synthetic lubricating oil provided by the specific embodiments 1 to 5 of the present invention, the following is further described in detail through specific test examples:

Lubricity - Wear spot diameter test: The high-performance special synthetic lubricating oils prepared in the above-mentioned specific embodiments 1-5 and the test samples of comparative example 1 (commercially available similar competitive lubricating oils) were tested on the test instrument respectively, using the four-ball method test. The test results are shown in Table 1.

Lubricity-wear spot diameter: Tested according to the test method of GB/T 3142, the test results are shown in Table 1. Method A: Remove the nut, take out the steel ball, wipe and clean it, put the steel ball on a suitable ball seat, use a microscope to measure the horizontal and vertical diameters of any one of the three steel balls in the wear spot, take the arithmetic mean, accurate to 0.01mm; b) Method B: Do not take out the steel ball, pour out the sample in the oil box, and wipe off the excess sample on the surface of the steel ball, use a microscope to measure the horizontal and vertical diameters of any one of the three steel balls in the wear spot, take the arithmetic mean, accurate to 0.01mm; Note: If the edge of the wear spot is blurred or irregular, use the estimation method to determine the wear spot diameter. If the wear spot has an abnormal shape or there are obvious scratches on the surface, even if it is smaller than the table value, it can be directly judged that the oil film has been broken.

Lubricating oil oxidation stability (rotating oxygen bomb method): According to SH/T 0193-92, place the sample, distilled water and copper catalyst coil together in a covered glass sample container, and then place it in an oxygen bomb equipped with a pressure gauge. The oxygen bomb is filled with oxygen at a pressure of 620kPa (6.2ba or 90psi) at room temperature and placed in an oil bath at a specified temperature (140℃ for insulating oil; 150℃ for turbine oil). The oxygen bomb is 30° at an angle to the horizontal plane and rotates axially at a speed of 100r/min. When the specified pressure drop is reached, stop the test. Record the test time and express it in minutes (min) according to the oxygen bomb test time as the oxidation stability of the sample. 6 The test results are shown in Table 1 below.

Conductivity: The sample was left to stand in a room maintained at a constant temperature of 25°C for at least 12 hours, after which it was calculated using a conductivity meter model 1152 made by US company Emcee Electronics. The measured value is expressed in Siemens (S). Evaluation criteria: Not less than 200 pS/m is qualified, and less than 200 pS/m is unqualified.

Table 1

As can be seen from Table 1, the high-performance special synthetic lubricating oil prepared by the preparation method of the high-performance special synthetic lubricating oil provided by the specific embodiment of the present invention has better lubrication performance and oxidation stability than the commercially available similar competitive lubricating oil of Comparative Example 1, and the electrical conductivity can reach more than 200pS/m, which can effectively prevent problems caused by static electricity and is beneficial to improving the transportation safety of lubricating oil.

It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Although the present application has been described above with reference to specific embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the various features in the specific embodiments disclosed in the present application may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (9)

1. The high-performance special synthetic lubricating oil is characterized by being mainly prepared from base oil, high-temperature antioxidant, antiwear agent, dispersing agent, pour point depressant and viscosity index improver, wherein the mass ratio of the base oil to the high-temperature antioxidant to the antiwear agent to the dispersing agent to the pour point depressant to the viscosity index improver is (50-60): 3-5): 1-3): 1-2.5: 2-4;

The high-temperature antioxidant is octyl butyl diphenylamine; the antiwear agent is iminodibenzyl.

2. The high performance special synthetic lubricating oil of claim 1, wherein the base oil is any one or a combination of synthetic base oil or biological base oil.

3. The high-performance special synthetic lubricating oil according to claim 2, wherein the base oil is a mixture of PAO synthetic base oil and polyol ester in any proportion.

4. A high performance special synthetic lubricating oil according to claim 3, wherein the dispersant is one of isostearic acid monoglyceride, sorbitan monopalmitate, sorbitan palmitate, span 40, sorbitan monolaurate.

5. The special high-performance synthetic lubricating oil according to claim 4, wherein the pour point depressant is a composite pour point depressant polymer, is a PMA polymethacrylate pour point depressant, and is prepared from 2-hydroxy-6- (4-hydroxy-2-methoxy-6-methoxycarbonylphenoxy) -4-methylbenzoic acid methyl ester.

6. The special high-performance synthetic lubricating oil according to claim 4, wherein the viscosity index improver is ethylene propylene diene monomer, and the third monomer of the ethylene propylene diene monomer is one of 7-octadiene, 6, 10-dimethyl-1, 5, 9-undecatriene, 3, 7-dimethyl-1, 6-octadiene and 5, 7-dimethyl-1.

7. A method for preparing a high performance special synthetic lubricating oil according to any one of claims 1 to 6, comprising the steps of:

S1, respectively weighing base oil, a high-temperature antioxidant, an antiwear agent, a dispersing agent, a pour point depressant and a viscosity index improver according to mass ratio for later use;

s2, adding the base oil into a reaction kettle, heating to 60-80 ℃, and adding the high-temperature antioxidant while stirring to obtain a first mixture;

S3, continuing heating to heat the first mixture obtained in the step S2 to 95-110 ℃, stirring for 55-65 min, then cooling to 80-90 ℃, adding an antiwear agent while stirring, stirring for 30-40 min, cooling to 60-70 ℃, then adding a dispersing agent, a pour point depressant and a viscosity index improver, stirring for 30-40 min, and cooling to room temperature to obtain the high-performance special synthetic lubricating oil.

8. The method for preparing high-performance special synthetic lubricating oil according to claim 7, wherein the stirring rotation speed in the step S2 is 30-50 r/min.

9. The method for preparing high-performance special synthetic lubricating oil according to claim 8, wherein the stirring rotation speed in the step S3 is 30-50 r/min.