Lubricating grease for rail side lubrication oiler and preparation method of lubricating grease

Abstract

The invention relates to the technical field of lubricating grease, in particular to lubricating grease for a rail side lubrication oiler and a preparation method of the lubricating grease. The raw materials for preparing the lubricating grease mainly comprise the following components: 90-110 parts of base oil, 25-36 parts of a thickening agent, 2.2-3 parts of an anti-wear reagent at extreme pressure, 5-10 parts of a solid lubricant, 1.5-2 parts of a clearing agent, 0.5-1.5 parts of an antioxidant, 0.5-1 part of a friction modifier, 1-3 parts of an antirust agent, 2-3.5 parts of an adhesive and 0.5-1.5 parts of a metal deactivator. The extreme pressure anti-wear agent is prepared from tricresyl phosphate and modified chlorinated paraffin. The lubricating grease provided by the invention has relatively good stability and extreme pressure anti-wear performance and excellent high and low temperature performance, so that the service life of the lubricating grease is effectively prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating grease, in particular to a lubricating grease for a rail side lubricating oiler and a preparation method thereof. Background Art

[0002] Grease, a thick, semi-solid, oil-like compound, is widely used in defense, heavy industry, and rail transit. Grease uses a thickener to secure the base oil to the friction points, maintaining solid adhesion at room temperature. When subjected to pressure or temperature changes, it releases the lubricant, achieving dynamic lubrication. Due to the special operating conditions of rail transit—including frequent starts and stops, heavy-load shock, extreme temperature fluctuations from -40°C to 100°C, exposure to wind and rain, and high-speed variable speed operation—multiple stringent standards are imposed on grease: it must possess excellent high- and low-temperature performance and viscosity-temperature characteristics, long-lasting extreme pressure and anti-wear properties, and long-life lubrication characteristics to accommodate the maintenance inconvenience of field operations. These performance requirements collectively constitute the core technical specifications for grease in rail transit.

[0003] Therefore, in view of the core technical indicators that the above-mentioned rail transit grease should have, we propose a grease for rail side lubrication lubricator and a preparation method thereof. Summary of the Invention

[0004] The object of the present invention is to provide a grease for a rail side lubricating oiler and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solution: step 1: separating the base oil into base oil A and base oil B in a mass ratio of 17:1; step 2: heating and mixing the base oil A, an adhesive, a thickener, and a detergent and performing a heat and pressurization treatment to obtain a mixture; step 3: after releasing the pressure, heating and mixing the mixture with the base oil B, and then mixing it with an extreme pressure anti-wear agent, a rust inhibitor, an antioxidant, a friction modifier, a metal passivator, and a solid lubricant, performing a cyclic shear treatment, and then homogenizing and degassing treatment to obtain a grease for a railside lubricating oiler.

[0006] Furthermore, the grease includes the following components by mass: 90-110 parts of base oil, 25-36 parts of thickener, 2.2-3 parts of extreme pressure anti-wear agent, 5-10 parts of solid lubricant, 1.5-2 parts of detergent, 0.5-1.5 parts of antioxidant, 0.5-1 part of friction modifier, 1-3 parts of rust inhibitor, 2-3.5 parts of adhesive, and 0.5-1.5 parts of metal passivator.

[0007] Furthermore, the base oil is compounded by HVI500, MVI150BS, cyclohexane dicarboxylate and polyol in a mass ratio of 20:4:1:25, and the base oil viscosity is 13~16mm2 / s.

[0008] Furthermore, the polyol is C5-C 10 Pentaerythritol fatty acid esters.

[0009] In the above technical solution, the base oils include HVI500, MVI150BS, cyclohexanedicarboxylate, and polyols. By combining these four base oils, HVI500, MVI150BS, cyclohexanedicarboxylate, and polyols, the performance indicators of the grease produced from these base oils can be significantly improved. Specifically, the HVI500 base oil imparts excellent viscosity-temperature characteristics and low volatility to the base material; the MVI150BS base oil provides good lubricity and oil film retention; the cyclohexanedicarboxylate base oil enhances the product's high-temperature stability while maintaining high wear resistance; and the polyol base oil provides the product with good low-temperature fluidity and is also biodegradable, making it environmentally friendly. This four-component composite system, through the synergistic effect of material properties, enables the finished grease to exhibit excellent high- and low-temperature performance and viscosity-temperature characteristics, long-lasting extreme pressure and anti-wear effects, and a long service life, making it particularly suitable for the special operating conditions of rail transit.

[0010] Furthermore, the thickener is obtained by compounding 12-hydroxy lithium stearate, organic bentonite and lithium stearate in a mass ratio of (1-3):(1-3):(1-3).

[0011] In the above technical solution, by combining 12-hydroxy lithium stearate, organic bentonite and lithium stearate as a thickener, multiple performance indicators of the grease can be synergistically optimized. Specifically: although 12-hydroxy lithium stearate can give the grease good curing degree and softness when used alone, there is a problem of insufficient stability; the use of lithium stearate alone will lead to improved lubrication performance and deterioration of fluidity, and the degree of curing is relatively low; the addition of organic bentonite significantly improves the low-temperature rheological properties of the system. It maintains phase stability during the curing process, has low temperature sensitivity, and can effectively inhibit the hardening of the grease under extreme low temperature conditions.

[0012] Furthermore, the solid lubricant is molybdenum disulfide powder, the particle size of which is 0.3 μm to 1.2 μm; the detergent is high-base synthetic calcium sulfonate, the total base number of which is 295 mgKOH / g, and the kinematic viscosity at 100°C is 200 mm 2 / s.

[0013] Furthermore, the antioxidant is alkylated phenylnaphthylamine and the friction modifier is alkyl molybdenum thiophosphate.

[0014] Furthermore, the rust inhibitor is barium petroleum sulfonate, the adhesive is hydrogenated styrene-isoprene copolymer, and the metal passivator is sodium methylbenzotriazole.

[0015] In the above technical solution, the adhesive used is hydrogenated styrene-isoprene copolymer, which can significantly enhance the water scour resistance of grease by increasing the viscosity of the base oil, thereby improving its water resistance and water erosion resistance.

[0016] Furthermore, the extreme pressure anti-wear agent is obtained by compounding tricresyl phosphate and modified chlorinated paraffin in a mass ratio of 1:1.

[0017] Furthermore, the preparation of the modified chlorinated paraffin comprises the following steps: Chlorinated paraffin, N-methylimidazole and distilled water were added into a three-necked flask in a mass ratio of 1:1:0.3, and the mixture was stirred and reacted in a water bath at 60-80°C for 48 hours to obtain a chlorinated paraffin-supported ionic liquid. The ionic liquid was washed repeatedly with ethyl acetate three times, and then washed repeatedly with deionized water three times, and dried in a vacuum drying oven at 40-50°C to obtain a modified chlorinated paraffin.

[0018] Furthermore, in step 2, the heating and mixing temperature is 60-100°C, the working conditions of the heating and pressurizing treatment are: temperature 150-155°C, pressure 0.42-0.45 MPa, and reaction time 2-3 hours; in step 3, the temperature is first heated to 165-180°C before adding base oil B, and then the temperature is heated to 210-220°C after adding base oil B.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention describes a grease for railside lubricating lubricators and a preparation method thereof. The grease uses HVI500, MVI150BS, cyclohexanedicarboxylate, and polyol as base oils. The base oils, thickeners, and additives are subjected to a heating reaction followed by cyclic shearing, homogenization, and degassing. This results in a grease with excellent high- and low-temperature performance and viscosity-temperature characteristics, durable extreme pressure and anti-wear effects, and a long service life, making it suitable for the special operating conditions of rail transit.

[0020] 2. The present invention describes a grease for a rail-side lubricating oiler and a method for preparing the same. A mixture of trimethylol phosphate and modified chlorinated paraffin is used as an extreme pressure anti-wear agent, alkyl molybdenum thiophosphate as a friction modifier, and molybdenum disulfide powder as a solid lubricant. During use, the extreme pressure anti-wear agent, friction modifier, and solid lubricant exhibit a significant synergistic mechanism. Under high-pressure friction conditions, phosphorus-containing compounds such as trimethylol phosphate and alkyl molybdenum thiophosphate react chemically with the metal surface to form a solid protective film with excellent anti-wear properties in situ. As the temperature rises due to continued operation, the molybdenum-containing friction modifier can effectively maintain the low-friction characteristics of the friction interface. At the same time, the load-bearing performance of the solid lubricant under high-temperature conditions is significantly improved, thereby effectively preventing sintering of the metal contact surface.

[0021] 3. The present invention describes a grease for a rail-side lubricating lubricator and a method for preparing the same. By modifying chlorinated paraffin with N-methylimidazole, the introduction of methylimidazole can significantly regulate the release kinetics of HCl in the chlorinated paraffin system. Its mechanism of action is primarily reflected in the following three aspects: First, the polarity characteristics of the chlorinated paraffin are improved through the molecular polarity enhancement effect; second, the free chlorine content in the system is promoted, which is conducive to the rapid formation of a stable and dense lubricating protective film at the friction interface; ultimately, this synergistic mechanism significantly improves the extreme pressure and anti-wear properties of the chlorinated paraffin. The modified chlorinated paraffin and tricresol phosphate are mixed in a 1:1 ratio as an extreme pressure and anti-wear agent and added to the base oil for reaction to produce a grease. The resulting grease has rapid film formation and high extreme pressure and anti-wear properties, thereby achieving the purpose of extending the service life. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0023] In the following specific embodiments, HVI500 base oil: from PetroChina Lanzhou Petrochemical Company; MVI150BS base oil: from PetroChina Lanzhou Petrochemical Company; Cyclohexane dicarboxylate base oil: Product No. A412788, sourced from Henan Alpha Chemical Co., Ltd. Polyol base oil: Product No. PB89314, sourced from Guangdong Wengjiang Chemical Reagent Co., Ltd. Lithium 12-hydroxystearate: Product No. W00518, sourced from Wuhan Jiyesheng Chemical Co., Ltd. Organic bentonite: Product No. BX0161, from Shanghai Baoyang Baoxin Biotechnology Co., Ltd. Lithium stearate: Product No. HC0503, sourced from Tianmen Hengchang Chemical Co., Ltd. Tricresyl phosphate: Product No. 01153, from Wuhan Kanos Technology Co., Ltd. Chlorinated paraffin: Product No. 63449-39-8, sourced from Wuhan Shuiyixing Pharmaceutical Chemical Co., Ltd. Molybdenum disulfide powder: Model Super Fine, from Climax Molybdenum; High base synthetic calcium sulfonate: Model T106, sourced from Jinzhou Shengda Chemical Co., Ltd. Alkylated phenylnaphthylamine: Product No. S5169, from Shanghai Yuanye Biotechnology Co., Ltd. Alkyl molybdenum thiophosphate: Model POUPC1001, sourced from Pacific Union (Beijing) Petrochemical Co., Ltd. Barium petroleum sulfonate: Product No. FXJ01, sourced from Jinan Shanhai Chemical Technology Co., Ltd. Hydrogenated styrene-isoprene copolymer: Model SEPS YH-4020, sourced from Sinopec Baling Petrochemical Company; Tolyltriazole sodium salt: Product No. XHL7092, from Hubei Xinhongli Chemical Co., Ltd. In the following examples and comparative examples, one portion is 1 g.

[0024] Example 1: A grease for a rail side lubricating lubricator and a preparation method thereof, comprising the following steps: Step 1: Separate the base oil into base oil A and base oil B at a mass ratio of 17:1; Step 2: 85 parts of base oil A are placed in a saponification kettle and heated to 60°C. 2 parts of crushed adhesive and 1.5 parts of detergent are added, and the mixture is heated to 80°C. 25 parts of thickener are added, and the mixture is capped and heated and pressurized to 150°C and 0.42 MPa, followed by constant temperature reaction for 2 hours. Step 3: After unloading the pressure, continue heating to 165°C, add 5 parts of base oil B, then heat to 210°C, transfer to a blending kettle, perform cyclic shearing, add 2.2 parts of an extreme pressure anti-wear agent (a mixture of tricresyl phosphate and modified chlorinated paraffin in a ratio of 1:1), 1 part of a rust inhibitor, 0.5 parts of an antioxidant, 0.5 parts of a friction modifier, 0.5 parts of a metal passivator, and 5 parts of a solid lubricant, homogenize, deaerate, and filter to obtain a grease for a railside lubricating lubricator. The base oil is prepared by compounding HVI500, MVI150BS, cyclohexanedicarboxylate and polyol in a mass ratio of 20:4:1:25; The preparation of the modified chlorinated paraffin comprises the following steps: 5 parts of chlorinated paraffin, 5 parts of N-methylimidazole and 1.5 parts of distilled water were added to a 250 mL three-necked flask, and the mixture was stirred in a 60°C water bath for 48 hours to obtain a chlorinated paraffin-supported ionic liquid. The ionic liquid was washed three times with ethyl acetate and then three times with deionized water, and dried in a vacuum drying oven at 40°C to obtain a modified chlorinated paraffin. The configuration mass ratio of the thickener is 12-hydroxy lithium stearate: organic bentonite: lithium stearate = 1:1:1.

[0025] Example 2: A grease for a rail side lubricating oiler and a preparation method thereof, comprising the following steps: Step 1: Separate the base oil into base oil A and base oil B at a mass ratio of 17:1; Step 2: Pour 94 parts of base oil A into a saponification kettle and heat to 75°C, add 3 parts of crushed adhesive and 1.7 parts of detergent, heat to 90°C, add 30 parts of thickener, cover, heat and pressurize to 155°C, 0.43MPa, and then react at constant temperature for 2.5 hours; Step 3: After unloading the pressure, continue heating to 170°C, add 6 parts of base oil B, and then heat to 215°C, transfer to a blending kettle, perform cyclic shearing, add 2.5 parts of an extreme pressure anti-wear agent (a mixture of tricresyl phosphate and modified chlorinated paraffin in a ratio of 1:1), 2 parts of a rust inhibitor, 1 part of an antioxidant, 0.7 parts of a friction modifier, 1 part of a metal passivator, and 7 parts of a solid lubricant, homogenize, deaerate, and filter to obtain a grease for a railside lubricating lubricator. The base oil is prepared by compounding HVI500, MVI150BS, cyclohexanedicarboxylate and polyol in a mass ratio of 20:4:1:25; The preparation of the modified chlorinated paraffin comprises the following steps: 5 parts of chlorinated paraffin, 5 parts of N-methylimidazole and 1.5 parts of distilled water were added to a 250 mL three-necked flask, and the mixture was stirred in a 75°C water bath for 48 hours to obtain a chlorinated paraffin-supported ionic liquid. The ionic liquid was washed three times with ethyl acetate and then three times with deionized water, and dried in a vacuum drying oven at 45°C to obtain a modified chlorinated paraffin. The configuration mass ratio of the thickener is 12-hydroxy lithium stearate: organic bentonite: lithium stearate = 1:2:1.

[0026] Example 3: A grease for a rail side lubricating oiler and a preparation method thereof, comprising the following steps: Step 1: Separate the base oil into base oil A and base oil B at a mass ratio of 17:1; Step 2: 104 parts of base oil A was placed in a saponification kettle and heated to 90°C. 3.5 parts of crushed adhesive and 2 parts of detergent were added, and the mixture was heated to 100°C. 36 parts of thickener was added. The mixture was capped and heated and pressurized to 155°C and 0.45 MPa, and then the reaction was kept at this temperature for 3 hours. Step 3: After unloading the pressure, continue heating to 180°C, add 6 parts of base oil B, then heat to 220°C, transfer to a blending kettle, perform cyclic shearing, add 3 parts of an extreme pressure anti-wear agent (a mixture of tricresyl phosphate and modified chlorinated paraffin in a ratio of 1:1), 3 parts of a rust inhibitor, 1.5 parts of an antioxidant, 1 part of a friction modifier, 1.5 parts of a metal passivator, and 10 parts of a solid lubricant, homogenize, deaerate, and filter to obtain a grease for a railside lubricating lubricator. The base oil is prepared by compounding HVI500, MVI150BS, cyclohexanedicarboxylate and polyol in a mass ratio of 20:4:1:25; The preparation of the modified chlorinated paraffin comprises the following steps: 5 parts of chlorinated paraffin, 5 parts of N-methylimidazole and 1.5 parts of distilled water were added to a 250 mL three-necked flask, and the mixture was stirred in an 80°C water bath for 48 hours to obtain a chlorinated paraffin-supported ionic liquid. The ionic liquid was washed three times with ethyl acetate and then three times with deionized water, and dried in a vacuum drying oven at 50°C to obtain a modified chlorinated paraffin. The configuration mass ratio of the thickener is 12-hydroxy lithium stearate: organic bentonite: lithium stearate = 1:3:1.

[0027] Comparative Example 1: A grease for a rail side lubricating oiler and a preparation method thereof, comprising the following steps: The extreme pressure anti-wear agent in Example 1 was not added; Step 1: Separate the base oil into base oil A and base oil B at a mass ratio of 17:1; Step 2: 85 parts of base oil A are placed in a saponification kettle and heated to 60°C. 2 parts of crushed adhesive and 1.5 parts of detergent are added, and the mixture is heated to 80°C. 25 parts of thickener are added, and the mixture is capped and heated and pressurized to 150°C and 0.42 MPa, followed by constant temperature reaction for 2 hours. Step 3: After unloading the pressure, continue heating to 165°C, add 5 parts of base oil B, and then heat to 210°C, transfer to a blending kettle, perform cyclic shearing, add 1 part of rust inhibitor, 0.5 parts of antioxidant, 0.5 parts of friction modifier, 0.5 parts of metal passivator and 5 parts of solid lubricant, homogenize, degas, and filter to obtain a grease for rail side lubricating oiler; The base oil is prepared by compounding HVI500, MVI150BS, cyclohexanedicarboxylate and polyol in a mass ratio of 20:4:1:25; The configuration mass ratio of the thickener is 12-hydroxy lithium stearate: organic bentonite: lithium stearate = 1:1:1.

[0028] Comparative Example 2: A grease for a rail side lubricating oiler and a preparation method thereof, comprising the following steps: The composite thickener in Example 1 was replaced with a single thickener, lithium 12-hydroxystearate; Step 1: Separate the base oil into base oil A and base oil B at a mass ratio of 17:1; Step 2: 85 parts of base oil A are placed in a saponification kettle and heated to 60°C. 2 parts of crushed adhesive and 1.5 parts of detergent are added, and the mixture is heated to 80°C. 25 parts of thickener are added, and the mixture is capped and heated and pressurized to 150°C and 0.42 MPa, followed by constant temperature reaction for 2 hours. Step 3: After unloading the pressure, continue heating to 165°C, add 5 parts of base oil B, then heat to 210°C, transfer to a blending kettle, perform cyclic shearing, add 2.2 parts of an extreme pressure anti-wear agent (a mixture of tricresyl phosphate and modified chlorinated paraffin in a ratio of 1:1), 1 part of a rust inhibitor, 0.5 parts of an antioxidant, 0.5 parts of a friction modifier, 0.5 parts of a metal passivator, and 5 parts of a solid lubricant, homogenize, deaerate, and filter to obtain a grease for a railside lubricating lubricator. The base oil is prepared by compounding HVI500, MVI150BS, cyclohexanedicarboxylate and polyol in a mass ratio of 20:4:1:25; The preparation of the modified chlorinated paraffin comprises the following steps: 5 parts of chlorinated paraffin, 5 parts of N-methylimidazole and 1.5 parts of distilled water were added to a 250 mL three-necked flask, stirred and reacted in a 75°C water bath for 48 hours to obtain a chlorinated paraffin-based supported ionic liquid. The ionic liquid was washed repeatedly with ethyl acetate 3 times, then washed repeatedly with deionized water 3 times, and dried in a vacuum drying oven at 45°C to obtain a modified chlorinated paraffin.

[0029] Comparative Example 3: A grease for a rail side lubricating oiler and a preparation method thereof, comprising the following steps: The chlorinated paraffin in the extreme pressure anti-wear agent in Example 1 was replaced with unmodified chlorinated paraffin; Step 1: Separate the base oil into base oil A and base oil B at a mass ratio of 17:1; Step 2: 85 parts of base oil A are placed in a saponification kettle and heated to 60°C. 2 parts of crushed adhesive and 1.5 parts of detergent are added, and the mixture is heated to 80°C. 25 parts of thickener are added, and the mixture is capped and heated and pressurized to 150°C and 0.42 MPa, followed by constant temperature reaction for 2 hours. Step 3: After unloading the pressure, continue heating to 165°C, add 5 parts of base oil B, then heat to 210°C, transfer to a blending kettle, perform cyclic shearing, add 2.2 parts of an extreme pressure anti-wear agent (a mixture of tricresyl phosphate and chlorinated paraffin in a ratio of 1:1), 1 part of a rust inhibitor, 0.5 parts of an antioxidant, 0.5 parts of a friction modifier, 0.5 parts of a metal passivator, and 5 parts of a solid lubricant, homogenize, deaerate, and filter to obtain a grease for a railside lubricating lubricator. The base oil is prepared by compounding HVI500, MVI150BS, cyclohexanedicarboxylate and polyol in a mass ratio of 20:4:1:25; The configuration mass ratio of the thickener is 12-hydroxy lithium stearate: organic bentonite: lithium stearate = 1:1:1.

[0030] Comparative Example 4: A grease for a rail side lubricating oiler and a preparation method thereof, comprising the following steps: The polyol, one of the components of the base oil in Example 1, is removed; Step 1: Separate the base oil into base oil A and base oil B at a mass ratio of 17:1; Step 2: 85 parts of base oil A are placed in a saponification kettle and heated to 60°C. 2 parts of crushed adhesive and 1.5 parts of detergent are added, and the mixture is heated to 80°C. 25 parts of thickener are added, and the mixture is capped and heated and pressurized to 150°C and 0.42 MPa, followed by constant temperature reaction for 2 hours. Step 2: After unloading the pressure, continue heating to 165°C, add 5 parts of base oil B, then heat to 210°C, transfer to a blending kettle, perform cyclic shearing, add 2.2 parts of an extreme pressure anti-wear agent (a mixture of tricresyl phosphate and modified chlorinated paraffin in a ratio of 1:1), 1 part of a rust inhibitor, 0.5 parts of an antioxidant, 0.5 parts of a friction modifier, 0.5 parts of a metal passivator, and 5 parts of a solid lubricant, homogenize, deaerate, and filter to obtain a grease for a railside lubricating lubricator. The base oil is prepared by compounding HVI500, MVI150BS and cyclohexanedicarboxylate in a mass ratio of 20:4:1; The preparation of the modified chlorinated paraffin comprises the following steps: 5 parts of chlorinated paraffin, 5 parts of N-methylimidazole and 1.5 parts of distilled water were added to a 250 mL three-necked flask, and the mixture was stirred in a 60°C water bath for 48 hours to obtain a chlorinated paraffin-supported ionic liquid. The ionic liquid was washed three times with ethyl acetate and then three times with deionized water, and dried in a vacuum drying oven at 40°C to obtain a modified chlorinated paraffin. The configuration mass ratio of the thickener is 12-hydroxy lithium stearate: organic bentonite: lithium stearate = 1:1:1.

[0031] Experiment: Take the greases obtained in Examples 1-3 and Comparative Examples 1-4, test their properties and record the test results: Working cone penetration test: At room temperature of 25°C, using GB / T 269-2023 as the reference standard, subject the sample to 60 full reciprocating cycles of the orifice plate in approximately 1 minute, after which the sample is tested; Dropping point test: Based on GB / T 4929-1985 as the reference standard, the sample is tested for dropping point; Pour point test: GB / T 3535-2006 is used as the reference standard, and the sample is tested using an automatic pour point tester; Stencil oil separation test: Using SH / T 0324-1992 as the reference standard, place the sample in a wire mesh and measure the mass percentage of oil flowing through the mesh after 24 hours at 100°C. Extreme pressure performance test (four-ball method): Based on SH / T 0202-1992 as the reference standard, the extreme pressure four-ball machine has a spindle speed of 1800r / min, a load of 4901N, and a test time of 10s; Anti-wear performance test: (four-ball method): Based on SH / T 0204-1992 as the reference standard, the wear four-ball machine has a spindle speed of 1200r / min, a load of 392N, and a test time of 60min; The results are shown in Table 1.

[0032] Table 1

[0033] According to the data in Table 1, the following conclusions can be clearly drawn: The greases obtained in Examples 1-3 were compared with the greases obtained in Comparative Examples 1-4. The test results show that: Compared with the comparative example, the greases obtained in Examples 1-3 have higher cone penetration, dropping point, pour point, maximum no-seizure load and sintering load, as well as lower steel mesh oil separation rate and wear scar diameter. This fully demonstrates that the grease prepared by the present invention has excellent high and low temperature performance and viscosity-temperature characteristics, long-lasting extreme pressure and anti-wear effects and long service life, and is suitable for greases for special working conditions of rail transit.

[0034] Compared with Example 1, Comparative Example 1 does not add an extreme pressure anti-wear agent, and the extreme pressure and anti-wear properties of the grease prepared are significantly reduced. It can be seen that the addition of a 1:1 mixture of tricresyl phosphate and modified chlorinated paraffin as an extreme pressure anti-wear agent in the grease of the present invention can effectively improve the extreme pressure and wear resistance of the grease.

[0035] Compared with Example 1, the chlorinated paraffin in the extreme pressure anti-wear agent used in Comparative Example 3 is unmodified, and the extreme pressure and wear resistance of the grease prepared is significantly reduced. It can be seen that the setting of the modified chlorinated paraffin component and its process in the present invention can improve the low extreme pressure and anti-wear properties of the grease prepared.

[0036] Compared with Example 1, no polyol was added to the base oil of Comparative Example 4, and the pour point of the resulting grease was significantly decreased, indicating that the addition of polyol gave the grease excellent low-temperature resistance (operating temperature -30°C) and maintained stable lubrication performance in extreme temperature environments.

[0037] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for preparing grease for rail side lubricating lubricator, characterized in that: The following steps are involved: Step 1: Separate the base oil into base oil A and base oil B at a mass ratio of 17:1; Step 2: heating and mixing the base oil A, adhesive, thickener, and detergent and subjecting them to a heating and pressurizing treatment to obtain a mixture; Step 3: After the pressure is released, the mixture is heated and mixed with base oil B, and then mixed with an extreme pressure anti-wear agent, a rust inhibitor, an antioxidant, a friction modifier, a metal passivator and a solid lubricant, and subjected to a cyclic shearing treatment, followed by homogenization and degassing treatment to obtain a grease for a rail side lubricating lubricator.

2. The method for preparing grease for rail side lubricating lubricator according to claim 1, characterized in that: The grease includes the following components by weight: 90-110 parts of base oil, 25-36 parts of thickener, 2.2-3 parts of extreme pressure anti-wear agent, 5-10 parts of solid lubricant, 1.5-2 parts of detergent, 0.5-1.5 parts of antioxidant, 0.5-1 part of friction modifier, 1-3 parts of rust inhibitor, 2-3.5 parts of adhesive, and 0.5-1.5 parts of metal passivator.

3. The method for preparing grease for rail side lubricating lubricator according to claim 1, characterized in that: The base oil is prepared by compounding HVI500, MVI150BS, cyclohexanedicarboxylate and polyol in a mass ratio of 20:4:1:25, and the base oil viscosity is 13-16 mm 2 / s.

4. The method for preparing grease for rail side lubricating lubricator according to claim 3, characterized in that: The polyol is C5-C 10 Pentaerythritol fatty acid esters.

5. The method for preparing lubricating grease for rail side lubricating lubricator according to claim 1, characterized in that: The thickener is prepared by compounding 12-hydroxy lithium stearate, organic bentonite and lithium stearate in a mass ratio of (1-3):(1-3):(1-3).

6. The method for preparing lubricating grease for rail side lubricating lubricator according to claim 1, characterized in that: The extreme pressure anti-wear agent is obtained by compounding tricresyl phosphate and modified chlorinated paraffin in a mass ratio of 1:

1.

7. The method for preparing lubricating grease for rail side lubricating lubricator according to claim 1, characterized in that: The solid lubricant is molybdenum disulfide micropowder with a particle size of 0.3 μm to 1.2 μm; the detergent is high-base synthetic calcium sulfonate with a total base number of 295 mgKOH / g and a kinematic viscosity of 200 mm at 100°C. 2 / s; the antioxidant is alkylated phenylnaphthylamine, the friction modifier is alkyl molybdenum thiophosphate, the rust inhibitor is barium petroleum sulfonate, the adhesive is hydrogenated styrene-isoprene copolymer, and the metal passivator is sodium methylbenzotriazole.

8. The method for preparing lubricating grease for rail side lubricating lubricator according to claim 6, characterized in that: The preparation of the modified chlorinated paraffin comprises the following steps: Chlorinated paraffin, N-methylimidazole and distilled water were mixed in a mass ratio of 1:1:0.3, stirred and reacted in a water bath at 60~80℃ for 48h to obtain a chlorinated paraffin-supported ionic liquid. The mixture was washed repeatedly with ethyl acetate for 3 times, then washed repeatedly with deionized water for 3 times, and dried in a vacuum drying oven at 40~50℃ to obtain a modified chlorinated paraffin.

9. The method for preparing lubricating grease for rail side lubricating lubricator according to claim 1, characterized in that: In step 2, the heating and mixing temperature is 60-100°C, the working conditions of the heating and pressurizing treatment are: temperature 150-155°C, pressure 0.42-0.45 MPa, and reaction time 2-3 hours; in step 3, the temperature is heated to 165-180°C before adding base oil B, and then the temperature is heated to 210-220°C after adding base oil B.

10. A lubricating grease for a rail side lubricating oiler obtained according to the preparation method according to any one of claims 1 to 9.

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