Lubricating agent, preparation method thereof and application of lubricating agent in hydraulic transmission oil

Abstract

The invention relates to the technical field of hydraulic transmission oil, in particular to a lubricant, a preparation method of the lubricant and application of the lubricant in hydraulic transmission oil. The lubricant comprises the following components: 6-fluoro-7-piperazine-1-methyl-4-oxo-[1, 3] thiazacyclo [3, 2-a] quinoline-3-carboxylic acid ethyl ester, alpha-cyano-3-phenoxybenzyl (R, S)-2-(4-chlorphenyl)-3-methyl butyrate, N, N-dimethylformamide, mono-succinimide and class I base oil, and is characterized in that the lubricant is prepared from the following components: 1-methyl-4-oxo-[1, 3] thiazacyclo [3, 2-a] quinoline-3-carboxylic acid ethyl ester, alpha-cyano-3-phenoxybenzyl (R, S)-2-(4-chlorphenyl)-3-methyl butyrate, 2- The liquid mixture can be stably dissolved in hydrodynamic transmission oil, the problem of compatibility between 6-fluoro-7-piperazine-1-methyl-4-oxo-[1, 3] sulfur nitrogen heterocyclic [3, 2-a] quinoline-3-carboxylic acid ethyl ester and 8 # hydrodynamic transmission oil is effectively solved, the liquid mixture accounting for 1-2% of the total weight is added into the 8 # hydrodynamic transmission oil, and the compatibility between 6-fluoro-7-piperazine-1-methyl-4-oxo-[1, 3] sulfur nitrogen heterocyclic [3, 2-a] quinoline-3-carboxylic acid ethyl ester and 8 # hydrodynamic transmission oil is improved. The friction performance of the 8 # hydraulic transmission oil can be improved, ingredients are saved, and the process method is simple.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic transmission oil, in particular to a lubricant, a preparation method thereof and application in hydraulic transmission oil BACKGROUND

[0002] Hydraulic transmission is a fluid transmission using liquid as working medium and utilizing liquid kinetic energy to transmit energy. Hydraulic couplings, hydraulic torque converters and automatic transmissions are typical hydraulic transmission devices.

[0003] The hydraulic transmission oils on the market in China are generally divided into three technical levels. The widely used No. 8 hydraulic transmission oil in China is the lowest level. The hydraulic transmission oil products meeting some expired international OEM standards are the intermediate level, such as the hydraulic transmission oil products meeting the already abolished Allison-C4 (TES-228) standard. The top-level hydraulic transmission oil products meet the in-use international OEM standards or obtain OEM certification, such as the hydraulic transmission oil products meeting the Caterpillar-TO4 standard or obtaining the TES-439 standard certification.

[0004] Friction performance is the core performance of hydraulic transmission oil, which mainly affects the gear shifting feeling of the engineering machinery driver. In the international OEM standard, the friction performance of the hydraulic transmission oil is evaluated by using the SAE No. 2 friction tester, and the maximum dynamic friction coefficient, the midpoint dynamic friction coefficient, the stopping time and the friction cycle number of the hydraulic transmission oil product are mainly investigated. There is a significant gap in the friction performance of hydraulic transmission oil products of different technical levels.

[0005] The benzene ring and oxygen element structure can form a close connection with the metal surface by contributing its electron pair under harsh friction conditions. The planar structure of the multi-benzene ring also provides stress support to the oil film. The halogen elements introduced by it also provide certain anti-wear performance, ensuring the strength of the oil film, and the overall structure improves the better friction performance of the hydraulic transmission oil.

[0006] Nitrogen-containing heterocyclic compounds and their derivatives are a class of compounds mainly containing five-membered, six-membered ring systems or fused ring systems with one or more heteroatoms. Active elements such as F and S can be combined. Under friction, nitrogen-containing heterocycles can effectively adsorb on the metal surface. The structure and derived F and S elements provide support stress for the oil film under extreme friction conditions. Therefore, it can improve the friction performance of the lubricating oil, but its solubility stability in the hydraulic transmission oil limits its application.

[0007] The friction performance of the currently marketed No. 8 hydraulic transmission oil product needs to be improved. SUMMARY

[0008] In view of the deficiencies of the prior art, the present application provides a lubricant, a preparation method thereof and application in hydraulic transmission oil.

[0009] In a first aspect, the present application discloses a lubricant, which comprises 6-fluoro-7-piperazin-1-methyl-4-oxo-[1,3]thiazepine-3-carboxylic acid ethyl ester, alpha-cyano-3-phenoxybenzyl (R,S)-2-(4-chlorophenyl)-3-methyl butyric acid ester, N,N-dimethylformamide, monosuccinimide and Group I base oil.

[0010] Preferably, the lubricant comprises the following components in parts by weight: 400-500 parts of 6-fluoro-7-piperazin-1-methyl-4-oxo-[1,3]thiazepine-3-carboxylic acid ethyl ester, 400-500 parts of alpha-cyano-3-phenoxybenzyl (R,S)-2-(4-chlorophenyl)-3-methyl butyric acid ester, 200-400 parts of N,N-dimethylformamide, 100-300 parts of monosuccinimide dispersant and 100-300 parts of Group I base oil.

[0011] Preferably, the lubricant comprises the following components in parts by weight: 400-500 parts of 6-fluoro-7-piperazin-1-methyl-4-oxo-[1,3]thiazepine-3-carboxylic acid ethyl ester, 400-500 parts of alpha-cyano-3-phenoxybenzyl (R,S)-2-(4-chlorophenyl)-3-methyl butyric acid ester, 300 parts of N,N-dimethylformamide, 200 parts of monosuccinimide dispersant and 200 parts of Group I base oil.

[0012] Preferably, the Group I base oil has a kinematic viscosity at 100℃ of 2.0-6.0 mm 2 / s.

[0013] In a second aspect, the present application discloses a preparation method of the lubricant of the first aspect, which comprises:

[0014] (1) mixing 6-fluoro-7-piperazin-1-methyl-4-oxo-[1,3]thiazepine-3-carboxylic acid ethyl ester and N,N-dimethylformamide, and stirring to obtain a first mixture;

[0015] (2) adding monosuccinimide dispersant, alpha-cyano-3-phenoxybenzyl (R,S)-2-(4-chlorophenyl)-3-methyl butyric acid ester and Group I base oil to the first mixture, heating and stirring to obtain a second mixture;

[0016] (3) filtering the second mixture, and removing the solvent to obtain the lubricant.

[0017] Preferably, the temperature of the stirring in step (1) is 55-65℃, and the stirring time is 4-5 hours.

[0018] Preferably, the temperature of the stirring in step (2) is 75-85℃, and the stirring time is 4-5 hours.

[0019] Preferably, the filtered liquid phase component in step (3) is subjected to rotary evaporation to remove the solvent, and the rotary evaporation is performed under the conditions of a vacuum degree of 95-105 Pa and a temperature of 85-95℃.

[0020] In a third aspect, the application discloses an application of the lubricant in the hydraulic transmission oil.

[0021] Preferably, the application comprises:

[0022] The lubricant is mixed with the hydraulic transmission oil, and the mass percentage of the lubricant in the hydraulic transmission oil is 1-2%.

[0023] Preferably, the hydraulic transmission oil is No. 8 hydraulic transmission oil.

[0024] Based on the above technical solution, the application has the following beneficial effects compared with the prior art:

[0025] 1. The lubricant in the application is prepared by fully mixing 6-fluoro-7-piperazine-1-methyl-4-oxo-[1, 3] thiazocine [3, 2-a] quinoline-3-carboxylic acid ethyl ester, α-cyano-3-phenoxybenzyl (R, S)-2-(4-chlorophenyl)-3-methyl butyric acid ester and a type I base oil containing a monosuccinimide dispersant. The monosuccinimide dispersant has a large number of active basic nitrogen, which can form a cross-linking product with the sulfur element of 6-fluoro-7-piperazine-1-methyl-4-oxo-[1, 3] thiazocine [3, 2-a] quinoline-3-carboxylic acid ethyl ester, and the type I base oil contains a large amount of condensed ring aromatic hydrocarbons and sulfur-containing organic compounds, thereby jointly promoting the solubility and stability of 6-fluoro-7-piperazine-1-methyl-4-oxo-[1, 3] thiazocine [3, 2-a] quinoline-3-carboxylic acid ethyl ester. In addition, the long-chain alkane structure of the monosuccinimide dispersant and the type I base oil can also be fully dissolved in the base oil in the hydraulic transmission oil, thereby effectively solving the solubility problem of fluorine-containing compounds and their heterocyclic derivatives in the hydraulic transmission oil, improving the storage stability of the lubricant, and preventing the lubricant from being precipitated from the hydraulic transmission oil. The type I base oil can also reduce the kinematic viscosity of the lubricant to make it easier to pour.

[0026] 2. The lubricant in the application has a simple preparation process and uses fewer components, thereby saving the effects of material preparation and process cost.

[0027] 3. The lubricant in the embodiments of the present application, when applied in the No. 8 hydraulic transmission oil, the mass percentage of the lubricant is 1-2%, so that the effect of increasing the friction performance of the hydraulic transmission oil is realized by less amount, greatly saving the use cost. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0029] The technical solutions of the present application will be further illustrated below in combination with specific embodiments.

[0030] In a first aspect, the embodiments of the present application disclose a lubricant, which comprises 6-fluoro-7-piperazin-1-methyl-4-oxo-[1,3]thiazepine-3-carboxylic acid ethyl ester, α-cyano-3-phenoxybenzyl (R,S)-2-(4-chlorophenyl)-3-methylbutyric acid ester, N,N-dimethylformamide, a suberimid dispersant and a Group I base oil.

[0031] Further, in the lubricant in the embodiments of the present application, the weight fractions of the components are determined in the following manner:

[0032]

[0033] In a preferred embodiment, in the lubricant in the embodiments of the present application, the N,N-dimethylformamide and the suberimid dispersant are both commercial products, the kinematic viscosity of the Group I base oil at 100℃ is 2.0-6.0 mm 2 / s. The molecular structural formula of the 6-fluoro-7-piperazin-1-methyl-4-oxo-[1,3]thiazepine-3-carboxylic acid ethyl ester is:

[0034]

[0035] The molecular structural formula of the α-cyano-3-phenoxybenzyl (R,S)-2-(4-chlorophenyl)-3-methylbutyric acid ester is:

[0036]

[0037] The present application will be described in detail below through specific embodiments and comparative examples:

[0038] Embodiment 1

[0039] The present embodiment provides a lubricant for hydraulic transmission oil, which is composed of the following components in parts by weight:

[0040] Table 1

[0041]

[0042]

[0043] The lubricant in the present embodiment is prepared according to the following method:

[0044] (1) 400 parts of 6-fluoro-7-piperazin-1-ylmethyl-4-oxo-[1,3]thiazepine-3-carboxylic acid ethyl ester and 300 parts of N,N-dimethylformamide are mixed and stirred at 60°C for 4 hours to obtain a first mixture;

[0045] (2) 200 parts of a succinimide dispersant, 400 parts of α-cyano-3-phenoxybenzyl (R,S)-2-(4-chlorophenyl)-3-methylbutyrate and 200 parts of a Group I base oil are sequentially added to the first mixture in (1), and gradually heated and stirred at 80°C for 4 hours to obtain a second mixture;

[0046] (3) The second mixture in (2) is filtered, and the liquid components after filtration are rotary evaporated at a vacuum degree of 100 Pa and a temperature of 90°C for 2 hours to remove the solvent, thereby obtaining the lubricant.

[0047] The lubricant is mixed with No. 8 hydraulic transmission oil, and the mass percentage of the lubricant in the No. 8 hydraulic transmission oil is 1% based on 100% of the mass of the No. 8 hydraulic transmission oil.

[0048] Example 2

[0049] The difference between the present embodiment and Example 1 is that the component ratio of the lubricant is different.

[0050] Table 2

[0051]

[0052] Example 3

[0053] The difference between the present embodiment and Example 1 is that the component ratio of the lubricant is different, and the lubricant in Example 3 comprises the following components in parts by weight:

[0054] Table 3

[0055]

[0056]

[0057] Example 4

[0058] The difference between this example and Example 1 is that the component ratio of the lubricant is different, and the lubricant in Example 3 comprises the following components in parts by weight:

[0059] Table 4

[0060]

[0061] Example 5

[0062] This example is the same as the lubricant formulation of Example 1, except that the lubricant is mixed with No. 8 hydraulic transmission oil, and the mass percentage of the lubricant in the No. 8 hydraulic transmission oil is 2% based on 100% of the mass of the No. 8 hydraulic transmission oil.

[0063] Example 6

[0064] This example is the same as the lubricant formulation of Example 2, except that the lubricant is mixed with No. 8 hydraulic transmission oil, and the mass percentage of the lubricant in the No. 8 hydraulic transmission oil is 2% based on 100% of the mass of the No. 8 hydraulic transmission oil.

[0065] Example 7

[0066] This example is the same as the lubricant formulation of Example 3, except that the lubricant is mixed with No. 8 hydraulic transmission oil, and the mass percentage of the lubricant in the No. 8 hydraulic transmission oil is 2% based on 100% of the mass of the No. 8 hydraulic transmission oil.

[0067] Example 8

[0068] This example is the same as the lubricant formulation of Example 4, except that the lubricant is mixed with No. 8 hydraulic transmission oil, and the mass percentage of the lubricant in the No. 8 hydraulic transmission oil is 2% based on 100% of the mass of the No. 8 hydraulic transmission oil.

[0069] Comparative Example 1

[0070] The difference between this comparative example and Example 1 is that the component ratio of the lubricant is different.

[0071] Table 5

[0072]

[0073]

[0074] Comparative Example 2

[0075] The difference between this comparative example and Example 1 is that the components of the lubricant are different. As follows:

[0076] Table 6

[0077]

[0078] Comparative Example 3

[0079] This comparative example is the same as the lubricant formulation of Example 1, except that the lubricant is mixed with the No. 8 hydraulic oil, and the mass percentage of the lubricant in the No. 8 hydraulic oil is 3% based on 100% of the mass of the No. 8 hydraulic oil.

[0080] Comparative Example 4

[0081] This comparative example is different from Example 1 in that the components of the lubricant are different.

[0082] Table 7

[0083]

[0084] Performance Characterization

[0085] The storage stability test is used to investigate the phase solubility of different components in the No. 8 hydraulic oil mixed with the lubricant in the above examples and comparative examples. The requirements under the corresponding storage conditions and storage time are shown in Table 8:

[0086] Table 8 Requirements under the corresponding storage conditions and storage time

[0087] Storage temperature Storage time Requirement Pour point temperature (-30°C) 24 hours Clear Room temperature (25°C) 30 days Clear

[0088] Based on Table 8, the storage stability test results of Examples 5-8 and Comparative Examples 1-4 above are shown in Table 9:

[0089] Table 9 Storage stability test results of Examples 1-8 and Comparative Examples 1-4

[0090] Storage test -30℃ / 24h 25°C / 30 days Example 1 Clear Clear Example 2 Clear Clear Example 3 Clear Clear Example 4 Clear Clear Example 5 Clear Clear Example 6 Clear Clear Example 7 Clear Clear Example 8 Clear Clear Comparative Example 1 Hazy Hazy Comparative Example 2 Clear Hazy Comparative Example 3 Hazy Hazy Comparative Example 4 Hazy Hazy

[0091] Further, using the SAE No. 2 friction tester, using the JASO M348 method, the friction cycle number and the average midpoint dynamic friction coefficient of the products 1 (commercial No. 8 hydraulic oil), product 2 (commercially available to meet Caterpillar-TO4 specifications) and the hydraulic oil of the example are tested using standard paper-based friction plates, and the test is terminated when the stopping time exceeds 1 second.

[0092] 1. The specific test data of products 1 and 2 are shown in Table 10, where μd is the average midpoint dynamic friction coefficient of the entire test, and the cycle number is taken in whole numbers.

[0093] Table 10

[0094] Product Cycle number μd Product 1 1500 0.047 Product 2 4000 0.077

[0095] 2. The specific test data of Examples 1-8 and Comparative Examples 1-3 are shown in Table 11, wherein μd is the average midpoint dynamic friction coefficient of the entire test, and the number of cycles is taken in whole hundreds.

[0096] Table 11

[0097]

[0098]

[0099] From Table 11, it can be seen that the lubricants in Examples 1-8 all can make the hydraulic transmission oil have excellent friction performance. The number of friction cycles and the average midpoint dynamic friction coefficient of the test are superior to those of the commercially available No. 8 hydraulic transmission oil product, and the friction performance is superior to that of the Caterpillar TO-4 specification product.

[0100] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions described in the foregoing examples can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A lubricant characterised in that, The components of the lubricant include: 6-fluoro-7-piperazin-1-ylmethyl-4-oxo-[1,3]thiaza-cyclo[3,2-a]quinoline-3-carboxylic acid ethyl ester, α-cyano-3-phenoxybenzyl (R,S)-2-(4-chlorophenyl)-3-methylbutyric acid ester, N,N-dimethylformamide, monosuccinimide and Group I base oil.

2. The lubricant of claim 1, wherein The components include: 400-500 parts of 6-fluoro-7-piperazin-1-ylmethyl-4-oxo-[1,3]thiaza-cyclo[3,2-a]quinoline-3-carboxylic acid ethyl ester, 400-500 parts of α-cyano-3-phenoxybenzyl (R,S)-2-(4-chlorophenyl)-3-methylbutyric acid ester, 200-400 parts of N,N-dimethylformamide, 100-300 parts of monosuccinimide dispersant and 100-300 parts of Group I base oil.

3. The lubricant of claim 2, wherein, The kinematic viscosity of the Group I base oil at 100°C is 2.0 to 6.0 mm 2 / s.

4. The method of producing a lubricant as claimed in claims 1 to 3, characterized in that, The components include: (1) mixing 6-fluoro-7-piperazin-1-ylmethyl-4-oxo-[1,3]thiaza-cyclo[3,2-a]quinoline-3-carboxylic acid ethyl ester and N,N-dimethylformamide, stirring to obtain a first mixture; (2) adding monosuccinimide dispersant, α-cyano-3-phenoxybenzyl (R,S)-2-(4-chlorophenyl)-3-methylbutyric acid ester and Group I base oil to the first mixture, heating and stirring to obtain a second mixture; (3) filtering the second mixture, removing the solvent to obtain the lubricant.

5. The preparation method according to claim 4, characterized in that, The temperature of the stirring in step (1) is 55-65℃ and the stirring time is 4-5 hours.

6. The preparation method according to claim 4, characterized in that, The temperature of the stirring in step (2) is 75-85℃ and the stirring time is 4-5 hours.

7. The preparation method according to claim 4, characterized in that, In step (3), the filtered liquid phase component is subjected to rotary evaporation to remove the solvent, and the rotary evaporation is carried out under the conditions of a vacuum degree of 95-105 Pa and a temperature of 85-95℃.

8. Use of the lubricant of any one of claims 1-3 in hydraulic transmission oil.

9. Use according to claim 8, characterized in that, The use includes: Mixing the lubricant with hydraulic transmission oil, and the mass percentage of the lubricant in the hydraulic transmission oil is 1-2% based on 100% of the mass of the hydraulic transmission oil.

10. Use according to claim 9, characterized in that, The hydraulic transmission oil is No. 8 hydraulic transmission oil.

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