Reinforcing agent composition for hydraulic transmission oil, preparation method and application thereof

Abstract

The present invention discloses a method for preparing a reinforcing agent composition for hydraulic transmission oil, comprising the following steps: 1. stirring dioctylamine, isopropyl alcohol, and sodium hydroxide, and adding disulfur dichloride under stirring; allowing the mixture to stand to separate the water layer; washing the oil layer with dilute hydrochloric acid and water until neutral; removing water, and then adding sulfuryl chloride with stirring to obtain a mixture A; 2. reacting the mixture A with 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-ylcarbamate, adding an aqueous ammonia solution to the reaction; allowing the mixture to stand to separate the water layers; desolvating the oil layer under reduced pressure; and adding a base oil, heating, and stirring to obtain a mixture B; and 3. stirring the mixture B with a boronized dispersant to obtain a reinforcing agent composition. When added to hydraulic transmission oil, the reinforcing agent composition imparts excellent friction durability to the hydraulic transmission oil.

Description

Technical Field

[0001] The present invention belongs to the technical field of lubricating oil reinforcing agent preparation, and in particular relates to a reinforcing agent composition for hydraulic transmission oil, and also relates to a preparation method of the reinforcing agent composition for hydraulic transmission oil and an application of the reinforcing agent composition for hydraulic transmission oil. Background Art

[0002] Hydraulic transmission fluid, also known as automatic transmission fluid (ATF) or automatic transmission oil, is often used as a working medium in vehicle automatic transmissions consisting of a torque converter, a hydraulic coupling and a mechanical transmission. It plays a role in transmitting energy in the vehicle transmission through the kinetic energy of the liquid.

[0003] According to preliminary statistics, my country's construction machinery hydraulic transmission oil is about 110,000 tons, of which service oil is about 90,000 tons and installed oil is about 20,000 tons. Domestic construction machinery OEMs mainly use domestic planetary gear transmissions, and copper-based friction plates are used for friction plates. No. 8 hydraulic transmission oil is generally selected. International OEMs generally use special oils (or obtain OEM certification, or meet OEM specifications) as hydraulic transmission oil.

[0004] The hydraulic transmission oils sold in China are generally divided into three technical levels. The No. 8 hydraulic transmission oil widely used in China is the lowest level; the hydraulic transmission oil products that meet some expired international OEM specifications are the middle level, such as some hydraulic transmission oil products that meet the obsolete Allison-C4 (TES-228) standards; the top hydraulic transmission oil products meet the current international OEM specifications or obtain OEM certification, such as hydraulic transmission oil products that need to meet Caterpillar-TO4 specifications or obtain AllisonTES-439 specifications certification.

[0005] Friction performance is a core property of hydraulic transmission oil, primarily affecting the shifting experience of construction machinery operators. International OEM specifications utilize an SAE No. 2 friction tester to evaluate the friction performance of hydraulic transmission oils, primarily examining the dynamic friction coefficient, static friction coefficient, dwell time, and number of friction cycles. The number of friction cycles reflects friction durability; a higher number of friction cycles indicates greater friction durability and a longer oil change interval. However, the friction durability of currently produced domestically produced No. 8 hydraulic transmission oil is relatively poor. Summary of the Invention

[0006] The first object of the present invention is to provide a method for preparing a reinforcing agent composition for hydraulic transmission oil.

[0007] The second object of the present invention is to provide a reinforcing agent composition for hydraulic transmission oil, which can improve the friction durability of domestic No. 8 hydraulic transmission oil.

[0008] The third object of the present invention is to provide an application of the reinforcing agent composition for hydraulic transmission oil.

[0009] The first technical solution adopted by the present invention is a method for preparing a reinforcing agent composition for hydraulic transmission oil, which specifically comprises the following steps:

[0010] Step 1: dioctylamine, isopropyl alcohol, and sodium hydroxide are stirred and disulfur dichloride is added under stirring. The mixture is allowed to stand to separate the water layer, and the oil layer is washed with dilute hydrochloric acid and water respectively until neutral. After removing the water, sulfuryl chloride is added with stirring to obtain a mixture A;

[0011] Step 2, stirring the mixture A obtained in step 1 with 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-ylcarbamate, adding a 10% ammonia aqueous solution to the reaction, standing the reaction mixture to remove moisture, decompressing the oil layer and desolventizing the oil layer, adding a base oil, and heating and stirring to obtain a mixture B;

[0012] Step 3: Stirring the mixture B obtained in step 2 with a boronated dispersant to obtain a reinforcing agent composition.

[0013] The present invention is also characterized in that:

[0014] In step 1, the mass ratio of dioctylamine, isopropyl alcohol and sodium hydroxide is 20:20:1;

[0015] The mass ratio of dioctylamine to disulfur dichloride is 5:3;

[0016] The mass ratio of disulfur dichloride to sulfuryl chloride is 1:0.98-1.02.

[0017] In step 1, the stirring temperature is 0° C., the stirring time after adding disulfur dichloride is 1 h, and the stirring time after adding sulfuryl chloride is 1 h.

[0018] In step 2, the mass ratio of mixture A, 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-ylcarbamate and aqueous ammonia solution is 25:17.5 to 30:1;

[0019] The mass ratio of mixture A to base oil is 5:1.

[0020] In step 2, the stirring temperature is 10° C., and the reaction is carried out for 2 h after adding the ammonia solution.

[0021] In step 3, the mass ratio of mixture B to the boronated dispersant is 10:1.

[0022] In step 3, the stirring temperature is 100°C.

[0023] In step 3, the boronated dispersant is monosuccinimide, bissuccinimide, or boronated monosuccinimide, or a mixture of the two in any ratio.

[0024] The second technical solution adopted by the present invention is that the reinforcing agent composition for hydraulic transmission oil is prepared by the above method.

[0025] The third technical solution adopted by the present invention is the use of the above-mentioned reinforcing agent composition for hydraulic transmission oil in hydraulic transmission oil.

[0026] The beneficial effects of the present invention are:

[0027] (1) The reinforcing agent composition for hydraulic transmission oil of the present invention comprises a specific content of 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-ylcarbamate, and when used in the preparation of hydraulic transmission oil, can make the hydraulic transmission oil have excellent friction durability;

[0028] (2) The preparation method of the reinforcing agent composition for hydraulic transmission oil of the present invention is simple and the raw materials are easy to obtain. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to specific embodiments.

[0030] The preparation method of the reinforcing agent composition for hydraulic transmission oil of the present invention specifically comprises the following steps:

[0031] Step 1: dioctylamine, isopropyl alcohol, and sodium hydroxide are stirred at 0°C, and disulfur dichloride is added under stirring. After stirring for 1 hour, the mixture is allowed to stand to separate the water layer, and the oil layer is washed with dilute hydrochloric acid and water until neutral. After removing the water, sulfuryl chloride is added with stirring and stirred for 1 hour to obtain a mixture A.

[0032] The mass ratio of dioctylamine, isopropyl alcohol and sodium hydroxide is 20:20:1;

[0033] The mass ratio of dioctylamine to disulfur dichloride is 5:3;

[0034] The mass ratio of disulfur dichloride to sulfuryl chloride is 1:0.98-1.02;

[0035] Step 2: reacting the mixture A obtained in step 1 with 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-ylcarbamate by stirring at a temperature of 10° C., adding a 10% ammonia aqueous solution to the reaction mixture, reacting for 2 hours, standing the mixture to remove moisture, desolvating the oil layer under reduced pressure, adding a base oil, and heating and stirring the mixture at 80° C. for 1 hour to obtain a liquid mixture;

[0036] The mass ratio of mixture A, 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-ylcarbamate and aqueous ammonia solution is: 25:17.5 to 30:1;

[0037] The mass ratio of mixture A to base oil is 5:1;

[0038] The base oil uses 5.5-6.5cSt Group I base oil;

[0039] Step 3, stirring the mixture B obtained in step 2 and the boronized dispersant at 100° C. for 2 hours to obtain a reinforcing agent composition;

[0040] The mass ratio of mixture B to boronated dispersant is 10:1;

[0041] The boronated dispersant is monosuccinimide, bissuccinimide, or boronated monosuccinimide, or a mixture of the two in any ratio.

[0042] The present invention also provides a reinforcing agent composition for hydraulic transmission oil, which is prepared by the above method.

[0043] The present invention also provides an application of a reinforcing agent composition for hydraulic transmission oil in hydraulic transmission oil, wherein the hydraulic transmission oil is domestic No. 8 hydraulic transmission oil, the mass percentage of the reinforcing agent composition for hydraulic transmission oil is 0.5% to 2.5%, the mass percentage of the hydraulic transmission oil is 97.5% to 99.5%, and the sum of the mass percentages of the two is 100%.

[0044] Example 1

[0045] Step 1: 1000 parts of dioctylamine, 1000 parts of isopropyl alcohol, and 50 parts of sodium hydroxide were stirred at 0°C, and 600 parts of disulfur dichloride were added under stirring. After stirring for 1 hour, the mixture was allowed to stand to separate the water layer, and the oil layer was washed with dilute hydrochloric acid and water until neutral. After removing the water, 600 parts of sulfuryl chloride were added with stirring and stirred for 1 hour to obtain a mixture A.

[0046] Step 2: 1000 parts of the mixture A obtained in step 1 and 700 parts of 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-ylcarbamate were stirred and reacted at a temperature of 10° C., and 40 parts of a 10% ammonia aqueous solution were added to the reaction. After reacting for 2 hours, the mixture was allowed to stand and decompose to remove moisture. After the oil layer was decompressed and desolventized, 200 parts of base oil were added, and the mixture was heated and stirred at 80° C. for 1 hour to obtain a mixture B;

[0047] The base oil uses 5.5-6.5cSt Group I base oil;

[0048] Step 3: Stir 1000 parts of the mixture B obtained in step 2 and 100 parts of boronated monosuccinimide at 100° C. for 2 hours to obtain a reinforcing agent composition.

[0049] The reinforcing agent composition for hydraulic transmission oil is used in hydraulic transmission oil. The hydraulic transmission oil is domestic No. 8 hydraulic transmission oil. The mass percentage of the reinforcing agent composition for hydraulic transmission oil is 1.5%, and the mass percentage of the hydraulic transmission oil is 98.5%.

[0050] Example 2

[0051] The difference from Example 1 is that 1000 parts of the mixture A obtained in step 1 and 950 parts of 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-ylcarbamate are stirred and reacted.

[0052] Example 3

[0053] The difference from Example 1 is that 1000 parts of the mixture A obtained in step 1 and 1200 parts of 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-ylcarbamate are stirred and reacted.

[0054] Example 4

[0055] The difference from Example 2 is that in step 3, 1000 parts of the mixture B obtained in step 2 and 100 parts of monosuccinimide are stirred at 100° C. for 2 hours to obtain a reinforcing agent composition.

[0056] Example 5

[0057] The difference from Example 2 is that in step 3, 1000 parts of the mixture B obtained in step 2 and 100 parts of bissuccinimide are stirred at 100° C. for 2 hours to obtain a reinforcing agent composition.

[0058] Example 6

[0059] The difference from Example 2 is that after removing water, 588 parts of sulfuryl chloride were added with stirring and stirred for 1 hour to obtain mixture A.

[0060] Example 7

[0061] The difference from Example 2 is that after removing water, 612 parts of sulfuryl chloride were added with stirring and stirred for 1 hour to obtain mixture A.

[0062] Comparative Example 1

[0063] The difference from Example 2 is that 1000 parts of the mixture A obtained in step 1 and 600 parts of 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-ylcarbamate are stirred and reacted.

[0064] Comparative Example 2

[0065] The difference from Example 2 is that 1000 parts of the mixture A obtained in step 1 and 1300 parts of 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-ylcarbamate are stirred and reacted.

[0066] Comparative Example 3

[0067] The difference from Example 2 is that the reinforcing agent composition for hydraulic transmission oil is used in the hydraulic transmission oil, the mass percentage of the reinforcing agent composition for hydraulic transmission oil is 0.5%, and the mass percentage of the hydraulic transmission oil is 99.5%.

[0068] Comparative Example 4

[0069] The difference from Example 2 is that the reinforcing agent composition for hydraulic transmission oil is used in the hydraulic transmission oil, the mass percentage of the reinforcing agent composition for hydraulic transmission oil is 2.5%, and the mass percentage of the hydraulic transmission oil is 97.5%.

[0070] In each embodiment and comparative example, 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-ylcarbamate is a commercially available product with the structural formula:

[0071]

[0072] In each embodiment and comparative example, dioctylamine, isopropyl alcohol, sodium hydroxide, disulfur dichloride, sulfuryl chloride and alkali solution are commercially available products, and No. 8 hydraulic transmission oil is a commercially available No. 8 hydraulic transmission oil product.

[0073] Performance Characterization

[0074] The above examples and comparative products were tested using the Allison C4 Paper Friction Test of the Southwest Research Institute of America. Passing the Allison C4 Paper Friction Test requires 10,000 friction cycles and must meet its test conditions. The specific test conditions are shown in Table 1:

[0075] Table 1

[0076] name Testing requirements Stop Time No more than 0.600s Midpoint friction coefficient Not less than 0.096

[0077] The test automatically stops if the stop time exceeds 1.000s. The comparison products are commercially available No. 8 hydraulic transmission oil and KRA3 hydraulic transmission oil that meets the Allison C4 standard. Both tests were conducted for comparison.

[0078] Due to the large number of friction cycles, we only collected data from the 2000th, 4000th, 6000th, 8000th and 10000th cycles for comparison. The specific test results are shown in Table 2:

[0079] Table 2

[0080]

[0081]

[0082] As can be seen from Table 1, the hydraulic transmission oil obtained in the embodiment of the present invention has relatively excellent friction durability and can meet the requirements of the Allison C4 Paper Friction Test. Its friction durability is at the same technical level as that of KRA3 hydraulic transmission oil. Comparative Example 2 cannot be tested in the Allison C4 Paper Friction Test because needle-shaped crystals precipitate after being dissolved in No. 8 hydraulic transmission oil and left at room temperature for 24 hours.

Claims

1. Application of a reinforcing agent composition for hydraulic transmission oil in hydraulic transmission oil, characterized in that: The preparation method of the reinforcing agent composition for hydraulic transmission oil specifically comprises the following steps: Step 1: dioctylamine, isopropyl alcohol, and sodium hydroxide are stirred and disulfur dichloride is added under stirring. The mixture is allowed to stand to separate the water layer, and the oil layer is washed with dilute hydrochloric acid and water respectively until neutral. After removing the water, sulfuryl chloride is added with stirring to obtain a mixture A; Step 2, stirring the mixture A obtained in step 1 with 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-ylcarbamate, adding a 10% ammonia aqueous solution to the reaction, standing the reaction mixture to remove moisture, decompressing the oil layer and desolventizing the oil layer, adding a base oil, and heating and stirring to obtain a mixture B; In step 2, the mass ratio of mixture A, 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-ylcarbamate and aqueous ammonia solution is 25:17.5-30:1; the mass ratio of mixture A to base oil is 5:1; Step 3, stirring the mixture B obtained in step 2 with a boronated dispersant to obtain a reinforcing agent composition; The mass percentage of the reinforcing agent composition for hydraulic transmission oil is greater than 0.5% and less than 2.5%, the mass percentage of the hydraulic transmission oil is 97.5% to 99.5%, and the sum of the mass percentages of the two is 100%.

2. Use of the reinforcing agent composition for hydraulic transmission oil according to claim 1 in hydraulic transmission oil, characterized in that: In step 1, the mass ratio of dioctylamine, isopropyl alcohol and sodium hydroxide is 20:20:1; The mass ratio of dioctylamine to disulfur dichloride is 5:3; The mass ratio of disulfur dichloride to sulfuryl chloride is 1:0.98~1.

02.

3. Use of the reinforcing agent composition for hydraulic transmission oil according to claim 1 in hydraulic transmission oil, characterized in that: In step 1, the stirring temperature is 0° C., the stirring time after adding disulfur dichloride is 1 h, and the stirring time after adding sulfuryl chloride is 1 h.

4. Use of the reinforcing agent composition for hydraulic transmission oil according to claim 1 in hydraulic transmission oil, characterized in that: In step 2, the stirring temperature is 10° C., and the reaction is carried out for 2 h after adding the ammonia solution.

5. Use of the reinforcing agent composition for hydraulic transmission oil according to claim 1 in hydraulic transmission oil, characterized in that: In step 3, the mass ratio of mixture B to the boronated dispersant is 10:

1.

6. Use of the reinforcing agent composition for hydraulic transmission oil according to claim 1 in hydraulic transmission oil, characterized in that: In step 3, the stirring temperature is 100°C.

7. Use of the reinforcing agent composition for hydraulic transmission oil according to claim 1 in hydraulic transmission oil, characterized in that: In step 3, the boronated dispersant is one of monosuccinimide and bissuccinimide, or a mixture of the two in any ratio.

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