Degradable track rim lubricating composition and preparation method thereof

Abstract

The invention relates to the technical field of lubricants, and discloses a degradable track rim lubricating composition and a preparation method thereof.The degradable track rim lubricating composition is prepared from, by weight, 60-88 parts of epoxidized soybean oil ester base oil, 3-6 parts of organosilicon tetrafluoroborate antifriction agent, 3-8 parts of stearic acid, 0.5-5 parts of calcium hydroxide, 1-3.5 parts of aluminum isopropoxide and 1-6 parts of calcium citrate; 1-3 parts by weight of an antirust agent; 5-8 parts by weight of a tackifier; the temperature-resistant organosilicon tetrafluoroborate antifriction agent is added, so that the lubricating composition has a small friction coefficient at different temperatures, friction reduction is facilitated, and excellent antifriction and lubricating performance is shown. And the method has good practical application in the aspects of friction reduction and lubrication of train track rims and the like.

Description

Technical Field

[0001] The invention relates to the technical field of lubricants, in particular to a degradable rail wheel rim lubricating composition and a preparation method thereof. Background Art

[0002] The wheel rims of my country's high-speed trains are in contact with the inner side of the rails, which results in frequent friction. Especially at bends, due to the centrifugal force, the wheels squeeze against the rails, and the inner side of the rails rub against the wheel rims violently and wear severely, shortening the service life of the rails and wheels. Flange lubrication refers to adding lubrication measures at the contact point between the locomotive rims and the rails, which can effectively reduce the friction of the contact surface, and thus effectively reduce the loss of the locomotive rims and rails. Lubricating the rails and wheels with rim lubricants is the most effective way to reduce the friction between the rims and rails, reduce locomotive power loss, improve wheel-rail interaction, and reduce wheel-rail wear. At present, the most commonly used devices for my country's railway locomotives are the installation of spray devices and nozzles. These two devices can enable the train to spray grease to the inside of the rim at a pre-set frequency during operation, so that the grease can fully adhere to the rims, reduce the friction between the rails, and at the same time convert the friction between steel and steel into friction between oil and oil, reducing the friction loss during train operation.

[0003] Lubricants can lubricate, reduce friction, fill gaps, seal, and prevent rust. They are widely used in railway track rims, automobile engines, transmissions, precision machine tools, etc. Common lubricants use mineral oils as base oils, which are difficult to biodegrade and cause high pollution. In recent years, the development of biodegradable lubricants has become a research trend.

[0004] Using plant oil-based synthetic esters as the base oil of lubricants can make up for the deficiencies in some properties of mineral oil-based lubricants, and plant oil-based synthetic esters have good degradability, simple preparation methods, good lubrication performance and other advantages. Such as castor oil, pentaerythritol oleate, trimethylolpropane tristearate, etc. Epoxidized soybean oil is cheap and easy to obtain, biodegradable, green and environmentally friendly, and has a wide range of applications in lubricants and the like. Patent CN109536260B discloses an environmentally friendly grease with high lubrication performance and a preparation method thereof, using epoxy soybean oil and chlorinated paraffin as base oils, compounded with 12-hydroxystearic acid, lithium hydroxide powder, composite thermal stabilizer, carboxymethyl cellulose, etc., and the obtained environmentally friendly grease has high lubrication performance and biodegradability. However, the grease does not show a low friction coefficient and good friction-reducing lubrication performance. Summary of the invention

[0005] The technical problem to be solved is to provide a rail wheel rim lubricating composition with good lubrication performance and excellent friction reduction performance and a preparation method thereof.

[0006] Technical solution: A degradable rail wheel rim lubricating composition, comprising 60-86 parts by weight of epoxy soybean ester base oil, 3-6 parts by weight of organosilicon tetrafluoroborate friction reducer, 3-8 parts by weight of stearic acid, 0.5-5 parts by weight of calcium hydroxide, 1-3.5 parts by weight of aluminum isopropoxide, 1-6 parts by weight of calcium citrate, 1-3 parts by weight of rust inhibitor, and 5-8 parts by weight of tackifier;

[0007] The preparation method of epoxidized soybean oil ester base oil comprises:

[0008] Step A, adding epoxidized soybean oil and adipic acid into a reaction vessel, heating to 170-180° C., stirring for reaction for 5-10 minutes, stirring and cooling to room temperature to obtain adipic acid-modified epoxidized soybean oil.

[0009] Step B: Add toluene, adipic acid-modified epoxy soybean oil, trimethylolpropane and p-toluenesulfonic acid into a reaction vessel equipped with a water separator and a condenser reflux tube, and perform the reaction under a nitrogen atmosphere, perform reduced pressure distillation and dry to obtain an epoxy soybean oil ester base oil.

[0010] Preferably, in step A, the mass of adipic acid is 8-14% of the mass of the epoxidized soybean oil.

[0011] Preferably, in step B, the mass of trimethylolpropane and p-toluenesulfonic acid are 5-8% and 0.8-1.2% of the mass of adipic acid-modified epoxidized soybean oil, respectively.

[0012] Preferably, the reaction temperature in step B is 155-170° C. and the reaction time is 3-5 h.

[0013] Preferably, the preparation method of the organosilicon tetrafluoroborate friction reducer comprises:

[0014] Step (1), add acetonitrile, 1,3-bis(3-chloropropyl)-1,1,3,3-tetramethyldisiloxane, and N-methylimidazole to a reaction vessel equipped with a condenser reflux tube, place in a microwave reactor to react for 8-12 minutes, set the power to 500-600W, cool, distill under reduced pressure, wash the product with petroleum ether, and then recrystallize with ethanol to obtain an organosilicon quaternary ammonium salt. The reaction formula is:

[0015]

[0016] Step (2), add acetonitrile, organosilicon quaternary ammonium salt, water, sodium tetrafluoroborate to the reaction vessel, heat to 60-70°C, react for 3-5h, remove acetonitrile by vacuum distillation, extract the residual solution with dichloromethane, vacuum distill the organic phase, wash with acetone, and dry to obtain an organosilicon tetrafluoroborate friction reducer. The reaction formula is:

[0017]

[0018] Preferably, in step (1), the mass of N-methylimidazole is 57-65% of the mass of 1,3-bis(3-chloropropyl)-1,1,3,3-tetramethyldisiloxane.

[0019] Preferably, the mass of sodium tetrafluoroborate is 49-56% of the mass of the organosilicon quaternary ammonium salt.

[0020] Preferably, the preparation method of the degradable rail wheel rim lubricating composition comprises: putting the epoxy soybean oil base oil into a reactor, heating it to 115-125°C, adding aluminum isopropoxide, adding stearic acid after the aluminum isopropoxide melts, stirring and reacting for 30-40 minutes (at this time, stearic acid and aluminum isopropoxide react to generate aluminum isopropoxide-based compounds. In the production of conventional aluminum-based grease, a certain amount of water must be added to continue the reaction after the reaction is completed. Adding water is prone to danger during the production process. First, it is easy to overflow. Second, after adding water, the reaction will quickly generate a large amount of isopropanol gas, which is prone to flammability and explosion); the temperature is reduced to 100-110°C, and then calcium hydroxide is added, and stirred for 30-40 minutes (at this time, the excess stearic acid and calcium hydroxide react to slowly generate water and stearic acid. acid calcium; water and the isopropanol aluminum-based compound of the reaction product of the S1 process react slowly to release isopropanol gas); the temperature is raised to 150-155°C, calcium citrate is added and stirred for 30-40min, and then epoxy soybean oil ester base oil is added, and the temperature is continued to be raised to 160-165°C, and kept warm for 20-30min to ensure that the isopropanol aluminum stearate soap, calcium stearate and calcium citrate form hydrogen bonds and are organically combined into one; the material is transferred from the reactor to the blending kettle for cooling, and then epoxy soybean oil ester base oil is added, and the cycle shearing is 60-90min; finally, an organosilicon tetrafluoroborate friction reducer, a rust inhibitor, and a tackifier are added, and the homogenization is carried out at a pressure of 30Mpa and a medium and high pressure of 110°C, degassing, filtering, and packaging to obtain a degradable rail wheel rim lubricating composition.

[0021] Technical effect: The present invention utilizes a carboxyl group of adipic acid to react with the epoxy group of epoxy soybean oil to obtain adipic acid-modified epoxy soybean oil, and the introduced carboxyl group is then esterified with trimethylolpropane to obtain a biodegradable plant oil-based epoxy soybean oil ester as the base oil of the lubricating composition.

[0022] The invention adopts aluminum-based calcium-based composite soap, changes the traditional method of adding water to replace isopropyl alcohol in the aluminum-based grease reaction process, adopts the water generated by the reaction of calcium hydroxide and excess stearic acid in the aluminum-based reaction process to replace isopropyl alcohol gas, and also introduces calcium soap to improve the anti-wear performance of the grease; and in the reaction process, a certain amount of calcium citrate is added to compound at high temperature to enable the grease to have a higher dropping point, and the use temperature thereof can reach above 120 DEG C; at the same time, a certain amount of tackifier is used to improve the adhesion of the grease, and a certain amount of rust inhibitor is used to better protect the rails from being rusted.

[0023] The present invention uses 1,3-bis(3-chloropropyl)-1,1,3,3-tetramethyldisiloxane, N-methylimidazole and sodium tetrafluoroborate as reactants, and obtains a novel organosilicon tetrafluoroborate friction reducer through quaternization and ion exchange. The novel organosilicon tetrafluoroborate friction reducer is compounded with epoxy soybean oil ester base oil, stearic acid, calcium hydroxide, aluminum isopropoxide, calcium citrate, rust inhibitor, tackifier and the like, and the obtained degradable rail wheel rim lubricating composition has the characteristics of stable fat formation and large cone penetration, and the organosilicon tetrafluoroborate friction reducer with temperature resistance is added, the wear scar diameter of the lubricating composition is smaller, and the friction coefficient is smaller at different temperatures, which is conducive to reducing friction and showing excellent anti-friction lubrication performance. The novel organosilicon tetrafluoroborate friction reducer has good practical application in anti-friction lubrication of train track wheel rims and the like. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is illustrated below by way of example, and the scope of protection requested by the present invention includes but is not limited to the following embodiments.

[0025] The rust inhibitor of the present invention is BASF I RGACOR NPA, produced by Dongguan Heshibi New Materials Co., Ltd. The tackifier is polyisobutylene PB1400, produced by Wuxi Bingju Trading Co., Ltd.

[0026] Example 1

[0027] (1) Add 50 g of epoxidized soybean oil and 5.2 g of adipic acid into a reaction vessel, heat to 170° C., stir and react for 10 min, stir and cool to room temperature to obtain adipic acid-modified epoxidized soybean oil.

[0028] (2) Add 30 mL of toluene, 50 g of adipic acid-modified epoxy soybean oil, 3.2 g of trimethylolpropane, and 0.5 g of p-toluenesulfonic acid into a reaction vessel equipped with a water separator and a condenser reflux tube, heat to 160° C. in a nitrogen atmosphere, react for 4 h, distill under reduced pressure, and dry to obtain an epoxy soybean oil ester base oil.

[0029] (3) Add 15 mL of acetonitrile, 3 g of 1,3-bis(3-chloropropyl)-1,1,3,3-tetramethyldisiloxane, and 1.72 g of N-methylimidazole to a reaction vessel equipped with a condenser reflux tube, place in a microwave reactor for reaction for 10 min, set the power to 500 W, cool, distill under reduced pressure, wash the product with petroleum ether, and then recrystallize with ethanol to obtain an organosilicon quaternary ammonium salt.

[0030] (4) Add 20 mL of acetonitrile, 4 g of organosilicon quaternary ammonium salt, 10 mL of water, and 1.96 g of sodium tetrafluoroborate to a reaction vessel, heat to 65° C., react for 5 h, remove acetonitrile by vacuum distillation, extract the residual solution with dichloromethane, vacuum distill the organic phase, wash with acetone, and dry to obtain an organosilicon tetrafluoroborate friction reducer.

[0031] (5) Add 24g of epoxy soybean ester base oil into a reactor, heat it to 115°C, add 2.2g of aluminum isopropoxide, and after the aluminum isopropoxide melts, add 4.6g of stearic acid and stir for 40min; reduce the temperature to 100°C, add 3.6g of calcium hydroxide and stir for 30min; heat it to 150°C, add 1g of calcium citrate and stir for 40min, then add 24g of epoxy soybean ester base oil, continue to heat it to 165°C and keep it warm for 20min; transfer the material from the reactor to a blending kettle for cooling, add 24g of epoxy soybean ester base oil and circulate shear for 60min; finally, add 3g of organosilicon tetrafluoroborate friction reducer, 2g of rust inhibitor and 8g of tackifier, homogenize under high pressure, degas, filter and package to obtain a degradable rail wheel rim lubricating composition.

[0032] Example 2

[0033] (1) Add 50 g of epoxidized soybean oil and 7 g of adipic acid into a reaction vessel, heat to 170° C., stir and react for 10 min, stir and cool to room temperature to obtain adipic acid-modified epoxidized soybean oil.

[0034] (2) Add 30 mL of toluene, 50 g of adipic acid-modified epoxy soybean oil, 2.5 g of trimethylolpropane, and 0.4 g of p-toluenesulfonic acid into a reaction vessel equipped with a water separator and a condenser reflux tube, heat to 155° C. in a nitrogen atmosphere, react for 5 h, distill under reduced pressure, and dry to obtain an epoxy soybean oil ester base oil.

[0035] (3) Add 20 mL of acetonitrile, 3 g of 1,3-bis(3-chloropropyl)-1,1,3,3-tetramethyldisiloxane, and 1-1.95 g of N-methylimidazole to a reaction vessel equipped with a condenser reflux tube, place in a microwave reactor for reaction for 12 min, set the power to 500 W, cool, distill under reduced pressure, wash the product with petroleum ether, and then recrystallize with ethanol to obtain an organosilicon quaternary ammonium salt.

[0036] (4) Add 25 mL of acetonitrile, 4 g of organosilicon quaternary ammonium salt, 15 mL of water, and 2.24 g of sodium tetrafluoroborate to a reaction vessel, heat to 60° C., react for 5 h, remove acetonitrile by vacuum distillation, extract the residual solution with dichloromethane, vacuum distill the organic phase, wash with acetone, and dry to obtain an organosilicon tetrafluoroborate friction reducer.

[0037] (5) Add 20g of epoxy soybean ester base oil into a reactor, heat it to 115°C, add 3.5g of aluminum isopropoxide, and after the aluminum isopropoxide melts, add 3g of stearic acid and stir for 30min; reduce the temperature to 100°C, add 0.5g of calcium hydroxide and stir for 30min; raise the temperature to 155°C, add 4.6g of calcium citrate and stir for 30min, then add 20g of epoxy soybean ester base oil, continue to heat to 160°C and keep warm for 30min; transfer the material from the reactor to a blending kettle for cooling, add 20g of epoxy soybean ester base oil and circulate shear for 90min; finally, add 4g of organosilicon tetrafluoroborate friction reducer, 3g of rust inhibitor and 7g of tackifier, homogenize under high pressure, degas, filter and package to obtain a degradable rail wheel rim lubricating composition.

[0038] Example 3

[0039] (1) Add 50 g of epoxidized soybean oil and 4 g of adipic acid into a reaction vessel, heat to 180° C., stir and react for 5 min, stir and cool to room temperature to obtain adipic acid-modified epoxidized soybean oil.

[0040] (2) Add 30 mL of toluene, 50 g of adipic acid-modified epoxy soybean oil, 4 g of trimethylolpropane, and 0.6 g of p-toluenesulfonic acid into a reaction vessel equipped with a water separator and a condenser reflux tube, heat to 170° C. in a nitrogen atmosphere, react for 3 h, distill under reduced pressure, and dry to obtain an epoxy soybean oil ester base oil.

[0041] (3) Add 15 mL of acetonitrile, 3 g of 1,3-bis(3-chloropropyl)-1,1,3,3-tetramethyldisiloxane, and 1.71 g of N-methylimidazole to a reaction vessel equipped with a condenser reflux tube, place in a microwave reactor for reaction for 8 min, set the power to 600 W, cool, distill under reduced pressure, wash the product with petroleum ether, and then recrystallize with ethanol to obtain an organosilicon quaternary ammonium salt.

[0042] (4) Add 25 mL of acetonitrile, 4 g of organosilicon quaternary ammonium salt, 15 mL of water, and 2.24 g of sodium tetrafluoroborate to a reaction vessel, heat to 70° C., react for 3 h, remove acetonitrile by vacuum distillation, extract the residual solution with dichloromethane, vacuum distill the organic phase, wash with acetone, and dry to obtain an organosilicon tetrafluoroborate friction reducer.

[0043] (5) Add 28g of epoxy soybean ester base oil into a reactor, heat it to 120°C, add 1g of aluminum isopropoxide, and after the aluminum isopropoxide melts, add 8g of stearic acid and stir for 40min; reduce the temperature to 100°C, add 5g of calcium hydroxide and stir for 40min; raise the temperature to 150°C, add 6g of calcium citrate and stir for 30min, then add 28g of epoxy soybean ester base oil, continue to heat it to 160°C and keep it warm for 30min; transfer the material from the reactor to a blending kettle for cooling, add 28g of epoxy soybean ester base oil and circulate shear for 60min; finally, add 5g of organosilicon tetrafluoroborate friction reducer, 1g of rust inhibitor and 5g of tackifier, homogenize under high pressure, degas, filter and package to obtain a degradable rail wheel rim lubricating composition.

[0044] Example 4

[0045] (1) Prepare epoxidized soybean ester base oil according to the method of Example 1.

[0046] (2) Prepare an organosilicon tetrafluoroborate friction reducer according to the method of Example 1.

[0047] (3) Add 26g of epoxy soybean ester base oil into a reactor, heat it to 125°C, add 1.6g of aluminum isopropoxide, and after the aluminum isopropoxide melts, add 6.2g of stearic acid and stir for 30min; reduce the temperature to 100°C, add 4.4g of calcium hydroxide and stir for 40min; heat it to 155°C, add 2.6g of calcium citrate and stir for 30min, then add 26g of epoxy soybean ester base oil, continue to heat it to 160°C and keep it warm for 30min; transfer the material from the reactor to a blending kettle for cooling, add 26g of epoxy soybean ester base oil and circulate shear for 60min; finally, add 6g of organosilicon tetrafluoroborate friction reducer, 2.2g of rust inhibitor and 6.8g of tackifier, homogenize under high pressure, degas, filter and package to obtain a degradable rail wheel rim lubricating composition.

[0048] Comparative Example 1

[0049] (1) Prepare an organosilicon tetrafluoroborate friction reducer according to the method of Example 1.

[0050] (2) Add 24g of epoxy soybean oil into a reactor, heat it to 115°C, add 2.2g of aluminum isopropoxide, and after the aluminum isopropoxide melts, add 4.6g of stearic acid and stir for 40min; reduce the temperature to 100°C, add 3.6g of calcium hydroxide and stir for 30min; raise the temperature to 150°C, add 1g of calcium citrate and stir for 40min, then add 24g of epoxy soybean oil, continue to heat to 165°C and keep warm for 20min; transfer the material from the reactor to a blending kettle for cooling, add 24g of epoxy soybean oil and circulate shear for 60min; finally, add 3g of organosilicon tetrafluoroborate friction reducer, 2g of rust inhibitor and 8g of tackifier, homogenize under high pressure, degas, filter and package to obtain a degradable rail wheel rim lubricating composition.

[0051] Comparative Example 2

[0052] (1) Prepare adipic acid-modified epoxidized soybean oil according to the method of Example 1.

[0053] (2) Prepare an organosilicon tetrafluoroborate friction reducer according to the method of Example 1.

[0054] (3) Add 24g of adipic acid-modified epoxidized soybean oil into a reactor, heat it to 115°C, add 2.2g of aluminum isopropoxide, and after the aluminum isopropoxide melts, add 4.6g of stearic acid, and stir for 40min; reduce the temperature to 100°C, add 3.6g of calcium hydroxide, and stir for 30min; raise the temperature to 150°C, add 1g of calcium citrate, and stir for 40min, then add 24g of adipic acid-modified epoxidized soybean oil, continue to heat it to 165°C, and keep it warm for 20min; transfer the material from the reactor to a blending kettle for cooling, add 24g of adipic acid-modified epoxidized soybean oil, and circulate shear for 60min; finally, add 3g of organosilicon tetrafluoroborate friction reducer, 2g of rust inhibitor, and 8g of tackifier, homogenize under high pressure, degas, filter, and package to obtain a degradable rail wheel rim lubricating composition.

[0055] Comparative Example 3

[0056] (1) Prepare epoxidized soybean ester base oil according to the method of Example 1.

[0057] (2) Add 24g of epoxy soybean ester base oil into a reactor, heat it to 115°C, add 2.2g of aluminum isopropoxide, and after the aluminum isopropoxide melts, add 4.6g of stearic acid, and stir for 40min; reduce the temperature to 100°C, add 3.6g of calcium hydroxide, and stir for 30min; heat it to 150°C, add 1g of calcium citrate, and stir for 40min, then add 24g of epoxy soybean ester base oil, continue to heat it to 165°C, and keep it warm for 20min; transfer the material from the reactor to a blending kettle for cooling, and then add 24g of epoxy soybean ester base oil, and circulate shear for 60min; finally, add 2g of rust inhibitor and 8g of viscosity enhancer, homogenize under high pressure, degas, filter, and package to obtain a degradable rail wheel rim lubricating composition.

[0058] Comparative Example 4

[0059] (1) Add 15 mL of acetonitrile, 3 g of 1,6-dichlorohexane, and 3.18 g of N-methylimidazole to a reaction vessel equipped with a condenser reflux tube, place in a microwave reactor for reaction for 10 min, set the power to 500 W, cool, distill under reduced pressure, wash the product with petroleum ether, and dry to obtain a quaternary ammonium salt. The structural formula is:

[0060]

[0061] (2) Add 20 mL of acetonitrile, 4 g of quaternary ammonium salt, 10 mL of water, and 2.78 g of sodium tetrafluoroborate to the reaction vessel, heat to 65°C, react for 5 hours, remove acetonitrile by vacuum distillation, dry to remove water, wash with petroleum ether, and dry to obtain a tetrafluoroborate friction reducer. The structural formula is

[0062] (3) Add 24g of epoxy soybean ester base oil into a reactor, heat it to 115°C, add 2.2g of aluminum isopropoxide, and after the aluminum isopropoxide melts, add 4.6g of stearic acid, and stir for 40min; reduce the temperature to 100°C, add 3.6g of calcium hydroxide, and stir for 30min; heat it to 150°C, add 1g of calcium citrate, and stir for 40min, then add 24g of epoxy soybean ester base oil, continue to heat it to 165°C, and keep it warm for 20min; transfer the material from the reactor to a blending kettle for cooling, and then add 24g of epoxy soybean ester base oil, and circulate shear for 60min; finally, add 3g of tetrafluoroborate friction reducer, 2g of rust inhibitor, and 8g of tackifier, homogenize under high pressure, degas, filter, and package to obtain a degradable rail wheel rim lubricating composition.

[0063] The grease stability of the degradable rail wheel flange lubricating composition was observed.

[0064] The cone penetration of the lubricating composition was tested according to the GB / T 269-2023 method.

[0065] The degradation rate of the lubricating composition was tested according to the method of GB / T 21856-2008.

[0066] The anti-corrosion performance of the lubricating composition was tested according to the GB / T 5018-2008 method.

[0067] The performance test results are shown in Table 1.

[0068] Table 1: Performance Test

[0069]

[0070] According to the SHT 0204-1992 method, the anti-wear performance and wear scar diameter of the lubricating composition were tested using a four-ball friction tester at a test temperature of 75° C. When testing the friction coefficient of the lubricating composition, the load was 196N, the speed was 1000r / min, and the test temperature was 75-100° C. The performance test results are shown in Table 2.

[0071] Table 2: Performance Test

[0072]

[0073] It can be seen from Table 1 and Table 2 that in Examples 1-4, the esterification product of adipic acid-modified epoxidized soybean oil and trimethylolpropane, epoxy soybean oil trimethylolpropane ester, is used as the base oil of the lubricating composition, and organosilicon tetrafluoroborate is used as the friction reducer. The obtained degradable rail wheel rim lubricating composition has the characteristics of stable grease formation and large cone penetration. In addition, the temperature-resistant organosilicon tetrafluoroborate friction reducer is added, the wear scar diameter of the lubricating composition is smaller, and the friction coefficient is smaller at different temperatures, and the friction reduction and lubrication performance is excellent.

[0074] Comparative Example 1 and Comparative Example 2 use epoxidized soybean oil and adipic acid-modified epoxidized soybean oil as the base oil of the lubricating composition, which are unstable in grease formation, have small cone penetration, and large wear scar diameter and friction coefficient.

[0075] Comparative Example 3 did not add the organosilicon tetrafluoroborate friction reducer, the wear scar diameter and friction coefficient were large, and the friction reduction and lubrication performance was poor.

[0076] The tetrafluoroborate friction reducer added in Comparative Example 4 does not contain an organosilicon structure, has poor temperature resistance, and has poor friction reduction and lubrication performance, resulting in the lubricating composition having a friction coefficient and a wear scar diameter greater than those in the embodiments, and poor friction reduction and lubrication performance.

[0077] The above embodiments are only the best examples, and are not intended to limit the implementation of the present invention. In addition to the above embodiments, the present invention has other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A degradable rail wheel flange lubricating composition, characterized in that: The degradable rail wheel rim lubricating composition comprises 60-86 parts by weight of epoxy soybean ester base oil, 3-6 parts by weight of organosilicon tetrafluoroborate friction reducer, 3-8 parts by weight of stearic acid, 0.5-5 parts by weight of calcium hydroxide, 1-3.5 parts by weight of aluminum isopropoxide, 1-6 parts by weight of calcium citrate, 1-3 parts by weight of rust inhibitor, and 5-8 parts by weight of tackifier; The preparation method of the epoxy soybean ester base oil comprises: Step A, adding epoxidized soybean oil and adipic acid into a reaction vessel, heating to 170-180° C., stirring for reaction for 5-10 minutes, stirring and cooling to room temperature to obtain adipic acid-modified epoxidized soybean oil; Step B: Add toluene, adipic acid-modified epoxy soybean oil, trimethylolpropane and p-toluenesulfonic acid into a reaction vessel equipped with a water separator and a condenser reflux tube, and perform the reaction under a nitrogen atmosphere, perform reduced pressure distillation and dry to obtain an epoxy soybean oil ester base oil.

2. The degradable rail wheel flange lubricating composition according to claim 1, characterized in that: In the step A, the mass of the adipic acid is 8-14% of the mass of the epoxidized soybean oil.

3. The degradable rail wheel flange lubricating composition according to claim 1, characterized in that: In the step B, the mass of trimethylolpropane and p-toluenesulfonic acid are 5-8% and 0.8-1.2% of the mass of the adipic acid-modified epoxidized soybean oil, respectively.

4. The degradable rail wheel flange lubricating composition according to claim 1, characterized in that: In the step B, the reaction temperature is 155-170° C. and the reaction time is 3-5 hours.

5. The degradable rail wheel flange lubricating composition according to claim 1, characterized in that: The preparation method of the organosilicon tetrafluoroborate friction reducer comprises: Step (1), adding acetonitrile, 1,3-bis(3-chloropropyl)-1,1,3,3-tetramethyldisiloxane and N-methylimidazole into a reaction vessel equipped with a condenser reflux tube, placing the reaction vessel in a microwave reactor for reaction, performing reduced pressure distillation, washing and recrystallization to obtain an organosilicon quaternary ammonium salt; Step (2), adding acetonitrile, organosilicon quaternary ammonium salt, water and sodium tetrafluoroborate into a reaction container, heating to 60-70° C., reacting for 3-5 hours, distilling under reduced pressure, extracting, washing and drying to obtain an organosilicon tetrafluoroborate friction reducer.

6. The degradable rail wheel flange lubricating composition according to claim 5, characterized in that: In the step (1), the mass of N-methylimidazole is 57-65% of the mass of 1,3-bis(3-chloropropyl)-1,1,3,3-tetramethyldisiloxane.

7. The degradable rail wheel flange lubricating composition according to claim 5, characterized in that: In the step (1), the power of the microwave reactor during the reaction is 500-600 W, and the reaction time is 8-12 min.

8. The degradable rail wheel flange lubricating composition according to claim 5, characterized in that: In the step (2), the mass of sodium tetrafluoroborate is 49-56% of the mass of the organosilicon quaternary ammonium salt.

9. A method for preparing the degradable rail wheel rim lubricating composition according to any one of claims 1 to 8, characterized in that: The preparation method comprises: putting epoxy soybean ester base oil into a reaction kettle, heating it to 115-125°C, adding aluminum isopropoxide, adding stearic acid after the aluminum isopropoxide is melted, stirring and reacting for 30-40 minutes; reducing the temperature to 100-110°C, adding calcium hydroxide, stirring for 30-40 minutes; heating it to 150-155°C, adding calcium citrate, stirring for 30-40 minutes, adding epoxy soybean ester base oil, continuing to heat it to 160-165°C, and keeping warm for 20-30 minutes; transferring the material from the reaction kettle to a blending kettle for cooling, adding epoxy soybean ester base oil, and circulating shearing for 60-90 minutes; finally adding an organosilicon tetrafluoroborate friction reducer, a rust inhibitor, and a tackifier, high-pressure homogenization, degassing, filtering, and packaging to obtain a degradable rail wheel rim lubricating composition.

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