A lubricating grease composition, its preparation and use
By optimizing the compounding system of the grease composition, which includes base oil, thickener and metal inorganic nanocompounds, the problem of short bearing lubrication life at high speeds has been solved, and stable lubrication effect has been achieved at high speeds and ultra-long operating cycles.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA PETROLEUM & CHEMICAL CORP
- Filing Date
- 2024-12-16
- Publication Date
- 2026-06-16
Smart Images
Figure SMS_1 
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of lubricating grease, in particular to a lubricating grease composition and a preparation method and application thereof. BACKGROUND
[0002] Rail transit is the main passenger transport mode in China, and the safe and stable operation of each part is related to the safety of train operation. The traction motor is the most core part of the rail transit train, which is connected with the wheel set through the transmission device, and converts electrical energy into mechanical energy to drive the locomotive to run when the locomotive is in traction state. When the locomotive is in electric braking state, the traction motor can also convert the mechanical energy of the train into electrical energy to generate braking force of the train, thereby realizing energy recovery and utilization. The bearing is the core component of the traction motor, which is mainly used to reduce the mechanical load friction coefficient of the equipment in the transmission process. In the process of traction motor bearing movement, in order to reduce friction, buffer pressure and prolong the service life of the bearing, lubricating grease is needed. The lubricating grease is used to reduce the friction resistance of the friction pair and slow down the wear of the friction pair. It can also cool, clean and prevent pollution.
[0003] With the rapid development of rail transit industry, the main development direction of traction motor bearing is super-long operation cycle and high speed, and the use effect is directly related to the service life and economic life of the equipment. If the bearing fails, the traction motor has long maintenance cycle and high cost, which will not only affect the normal operation of the train, but also cause serious safety hazards. According to relevant statistics, about 40% of bearing damage is related to poor lubrication. For most bearings, the main means to prolong the operation cycle and service life is to strengthen lubrication. Therefore, the lubrication of traction motor bearing is very important, and whether the selection of lubricating material is reasonable will directly affect the safety of train operation.
[0004] Therefore, under the premise of ensuring the stability of the performance of the lubricating grease, how to greatly improve the lubricating life of the lubricating grease under high speed condition becomes a technical problem to be solved by the person skilled in the art. SUMMARY
[0005] At present, the existing technology related to lubricating grease is difficult to meet the use condition of super-long operation cycle of traction motor bearing, which is specifically shown as follows: high speed bearing is most likely to cause high temperature, and the high temperature generated by high speed operation of the bearing will accelerate the oxidation of the lubricating grease, cause the deterioration of the lubricating grease and shorten the lubricating life. The general lubricating grease is not suitable for high speed bearing, and the lubricating grease needs to be specially designed according to the size, speed, running temperature and other factors of high speed bearing.
[0006] At present, high-speed lubricating grease usually adopts low viscosity base oil, which can effectively reduce the bearing temperature under high speed within a certain time. However, the lower viscosity of the base oil cannot form a thick oil film. When the current flows through the bearing, the current will break through the extremely thin oil film of the rolling contact part, produce sparks, cause local melting damage of the contact surface, form arc discharge pitting, cause electric erosion of the bearing groove and steel ball, increase the friction coefficient, aggravate mechanical wear, cause abnormal heating of the bearing, and in severe cases, develop into peeling, and eventually cause premature failure of the bearing.
[0007] However, the present application unexpectedly found that the metal inorganic nanometer compound of the lubricating oil composition can further enhance the strength of the oil film, which is beneficial to meet the use requirements of the traction motor bearing.
[0008] Based on this, the present application has the following technical solutions: In a first aspect, the present application provides a kind of lubricating grease composition, comprising: base oil, thickening agent, metal inorganic nanometer compound and additive;The structure general formula of the metal inorganic nanometer compound is A x B y Wherein, A x It is inorganic nanometer metal atom, B y It is inorganic nanometer non-metal atom, the inorganic nanometer metal atom includes Zr, Nb, Ti, Ga or Co, the inorganic nanometer non-metal atom includes O, S or C, x is any value in 1~3, y is any value in 1~3.
[0009] In the present application, x can be 1, 2 or 3;Y can be 1, 2 or 3.
[0010] As preferred, the inorganic nanometer metal atom is Nb, and the inorganic nanometer non-metal atom is C.
[0011] In the present application, the preparation method of the metal inorganic nanometer compound comprises: Add 5~25ml of a mixed solution of hydrochloric acid and 0.2~2g of lithium fluoride to 1g of sieved ternary layered Nb2AlC ceramic powder, add a magnetic rotor and heat and stir in an oil bath for a period of time;Wash with deionized water and centrifuge, repeat several times until the PH value is greater than 5;Ultrasonic delamination is carried out by using an ultrasonic cleaning machine, and then centrifuged, the upper layer of suspension is filtered, and the single-layer two-dimensional crystal Nb2C nanometer material is obtained, and the bottom layer of solid is dried to obtain the multi-layer two-dimensional crystal Nb2C nanometer material.
[0012] As preferred, the amount of the metal inorganic nanometer compound is 2~6wt% based on the total mass of the lubricating grease composition.
[0013] As preferred, the thickening agent comprises lithium 12-hydroxystearate soap and C 25 ~C30 Long-chain dicarboxylic acid lithium soap.
[0014] Preferably, in the thickener, the 12-hydroxystearic acid lithium soap and C 25 ~C 30 The mass ratio of the long-chain dicarboxylic acid lithium soap is 1~6:1; more preferably 1~5:1; and even more preferably 3~5:1.
[0015] This invention discovers that when 12-hydroxystearic acid lithium soap and the aforementioned long-chain dicarboxylic acid lithium soap with the number of carbon atoms are used as thickeners and combined with the metal inorganic nanocompounds in the form of a compounded base oil, the mechanical stability, high and low temperature performance, and oil film strength of the grease can be significantly improved. Under the premise of stable performance, the lubrication requirements of bearings under high speed and ultra-long operating cycle conditions can be met simultaneously.
[0016] Preferably, the thickener is composed of 12-hydroxystearic acid and C 25 ~C 30 It is formed by saponification of long-chain dicarboxylic acids with lithium hydroxide and calcium hydroxide; 12-hydroxystearic acid, C 25 ~C 30 The total mass ratio of the long-chain dicarboxylic acid to the total mass ratio of lithium hydroxide and calcium hydroxide is 10:1~5; more preferably, 12-hydroxystearic acid, C 25 ~C 30 The total mass ratio of the long-chain dicarboxylic acid to the total mass ratio of lithium hydroxide and calcium hydroxide is 10:1~3.
[0017] Preferably, the base oil includes ester oils and polyalphaolefin synthetic oils.
[0018] More preferably, in the base oil, the mass ratio of the ester oil to the polyalphaolefin synthetic oil is 20~50:50~80.
[0019] More preferably, when the mass ratio of the ester oil to the polyalphaolefin synthetic oil is 30~40:60~70, the overall performance of the grease is better.
[0020] Preferably, the viscosity of the base oil at 40°C is 90~120 mmHg. 2 / s.
[0021] This invention discovers that using ultra-long carbon chain lithium dicarboxylate soap and 12-hydroxy stearate lithium soap as thickeners, and ester oil and polyalphaolefin synthetic oil as base oils for compounding, can significantly improve the mechanical stability and high and low temperature performance of lubricating grease.
[0022] Preferably, the grease composition comprises the following components in parts by weight: Base oil 60-85 parts; Thickener 8-16 parts; 2-6 parts of metal-inorganic nanocompounds.
[0023] Preferably, the grease composition further contains an antioxidant comprising an organoselenide and dilauryl thiodipropionate in a mass ratio of 1:(1-5); more preferably, the antioxidant comprises an organoselenide and dilauryl thiodipropionate in a mass ratio of 1:(1-3).
[0024] Preferably, the grease composition further contains a rust inhibitor comprising dodecenyl succinic acid and N-oleoyl sarcosine octadecylamine salt in a mass ratio of 1:(1~10); more preferably, the rust inhibitor comprises dodecenyl succinic acid and N-oleoyl sarcosine octadecylamine salt in a mass ratio of 1:(1~8).
[0025] Preferably, the grease composition comprises the following components in parts by weight: Base oil 60-85 parts; Thickener 8-16 parts; Antioxidant 1-3 parts; 2-6 parts of metal-inorganic nanocompounds; Rust inhibitor 1-5 parts.
[0026] Secondly, the method for preparing the lubricating grease composition includes: (1) Mix some base oil with 12-hydroxystearic acid and long-chain dicarboxylic acid, heat to melt the material; then add some lithium hydroxide solution and calcium hydroxide solution, and carry out saponification reaction at 90~105℃; (2) Add the remaining lithium hydroxide solution and calcium hydroxide solution, and continue to heat to 105~110℃ to carry out the composite reaction; after the composite reaction, heat to 200~220℃ for constant temperature. (3) Add some base oil and quench it quickly. After quenching, keep it at a constant temperature. Then add metal inorganic nano compounds and antioxidants below 160°C. After stirring evenly, cool it down. Add rust inhibitors when the temperature drops below 110°C. After stirring the additives evenly, perform post-treatment operations such as filtration, homogenization, and degassing. (4) After post-processing, the product is filled through the filling pipeline.
[0027] More preferably, the isothermal time for the saponification reaction is 90-120 min; the isothermal time for the composite reaction is 60-90 min; the isothermal time for the highest temperature is 1-10 min; and the isothermal time after rapid cooling is 30-50 min.
[0028] Thirdly, the present invention provides the application of the described grease composition in traction motor bearings.
[0029] This invention optimizes the compounding system of the grease composition, which can significantly improve the mechanical stability, oil film strength and lubrication life of the grease composition, and simultaneously meet the lubrication requirements of bearings under high speed and ultra-long operating cycle conditions while maintaining stable performance. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.
[0031] Unless otherwise specified, all raw materials used in the examples and comparative examples are commercially available conventional raw materials, and the technical means used are conventional means well known to those skilled in the art.
[0032] Example 1 This embodiment first provides a lubricating grease composition, comprising the following components in parts by weight: (1) 60 parts of compound base oil, wherein the mass ratio of ester oil and polyalphaolefin synthetic oil is 20:80.
[0033] (2) Mixed soap thickener: 8 parts, of which the mass ratio of 12-hydroxystearic acid lithium soap and 25-carbon dicarboxylic acid lithium soap is 3:1.
[0034] (3) Antioxidant: 1 part, wherein the mass ratio of organoselenide and dilaurate thiodipropionate is 1:1.
[0035] (4) Metal inorganic nanocompounds: 2 parts.
[0036] (5) Rust inhibitor: 1 part, wherein the mass ratio of dodecenyl succinic acid and N-oleoyl sarcosine octadecylamine salt is 1:3.
[0037] The metal-inorganic nanocompound is a multilayer two-dimensional crystalline Nb2C nanomaterial, and its preparation method includes the following steps: Add 1g of sieved ternary layered Nb2AlC ceramic powder to a mixed solution of 10ml hydrochloric acid and 1g lithium fluoride, add a magnetic rotor, and heat and stir in an oil bath for a period of time; wash with deionized water and centrifuge, repeating several times until the pH value is greater than 5; use an ultrasonic cleaner to ultrasonically separate the layers, centrifuge, take the upper suspension and filter to obtain the single-layer two-dimensional crystal Nb2C nanomaterial, take the bottom solid and dry it to obtain the multi-layer two-dimensional crystal Nb2C nanomaterial.
[0038] (5) Rust inhibitor: 1.5 parts, wherein the mass ratio of dodecenyl succinic acid and N-oleoyl sarcosine octadecylamine salt is 1:5.
[0039] This embodiment further provides a method for preparing the lubricating grease composition, comprising the following steps: Before production, 40 kg of lithium hydroxide was diluted with 150 kg of water and heated for later use. 300 kg of compound base oil was added to the reactor. 240 kg of 12-hydroxystearic acid and 80 kg of pentacarbamate were added, and the materials were stirred and heated. After the materials were completely dissolved, some lithium hydroxide and calcium hydroxide solution were added, and the temperature was raised to 90°C. The reaction was carried out at this temperature for 1.5 hours, and then the temperature was raised to 105°C. The remaining lithium hydroxide solution was added, and the temperature was carried out at this temperature for 1 hour. The temperature was raised to 210°C, and after being carried out at this temperature for 5 minutes, 400 kg of compound base oil was added and the mixture was rapidly cooled. After rapid cooling, the temperature was carried out at this temperature for 30 minutes. After the temperature dropped below 160°C, 12 kg of antioxidant and 24 kg of metal inorganic nanocompound were added. When the temperature dropped to 100°C, 12 kg of rust inhibitor was added, and the mixture was circulated and filtered while being homogenized using a homogenizer. After filtration and homogenization, degassing was performed. After post-treatment and when the appearance was qualified, the mixture was bottled through the filling pipeline to obtain sample 1.
[0040] Example 2 This embodiment first provides a lubricating grease composition, comprising the following components in parts by weight: (1) 65 parts of compound base oil, wherein the mass ratio of ester oil and polyalphaolefin synthetic oil is 30:70.
[0041] (2) Mixed soap thickener: 10 parts, wherein the mass ratio of 12-hydroxystearic acid lithium soap and 25-carbon dicarboxylic acid lithium soap is 3.5:1.
[0042] (3) Antioxidant: 1.5 parts, wherein the mass ratio of organoselenide and dilaurate thiodipropionate is 1:1.5.
[0043] (4) Metal inorganic nanocompounds: 3 parts; the metal inorganic nanocompounds are multilayer two-dimensional crystal Nb2C nanomaterials; This embodiment further provides a method for preparing the lubricating grease composition, comprising the following steps: Before production, 50 kg of lithium hydroxide was diluted with 250 kg of water and heated for later use. 350 kg of compound base oil was added to the reactor. 270 kg of 12-hydroxystearic acid and 78 kg of pentacarbamate were added, and the materials were stirred and heated. After the materials were completely dissolved, some lithium hydroxide and calcium hydroxide solution were added, and the temperature was raised to 90°C. The reaction was carried out at this temperature for 1.5 hours, and then the temperature was raised to 105°C. The remaining lithium hydroxide solution was added, and the temperature was held at this temperature for 1 hour. The temperature was raised to 210°C, and after holding at this temperature for 3 minutes, 400 kg of compound base oil was added and the mixture was rapidly cooled. After rapid cooling, the temperature was held at this temperature for 30 minutes. After the temperature dropped below 160°C, 17 kg of antioxidant and 34 kg of metal inorganic nanocompound were added. When the temperature dropped to 100°C, 17 kg of rust inhibitor was added, and the mixture was circulated and filtered while being homogenized using a homogenizer. After filtration and homogenization, degassing was performed. After post-treatment and when the appearance was qualified, the mixture was bottled through the filling pipeline, thus obtaining sample 2.
[0044] Example 3 This embodiment first provides a lubricating grease composition, comprising the following components in parts by weight: (1) 70 parts of compound base oil, wherein the mass ratio of ester oil and polyalphaolefin synthetic oil is 40:60.
[0045] (2) Mixed soap thickener: 12 parts, wherein the mass ratio of 12-hydroxystearic acid lithium soap and 25-carbon dicarboxylic acid lithium soap is 4:1.
[0046] (3) Antioxidant: 2 parts, wherein the mass ratio of organoselenide and dilaurate thiodipropionate is 1:2.
[0047] (4) Metal inorganic nanocompounds: 4 parts; the metal inorganic nanocompounds are multilayer two-dimensional crystal Nb2C nanomaterials.
[0048] (5) Rust inhibitor: 2 parts, wherein the mass ratio of dodecenyl succinic acid and N-oleoyl sarcosine octadecylamine salt is 1:6.
[0049] This embodiment further provides a method for preparing the lubricating grease composition, comprising the following steps: Before production, 55 kg of lithium hydroxide was diluted with 270 kg of water and heated for later use. 400 kg of compound base oil was added to the reactor. 300 kg of 12-hydroxystearic acid and 75 kg of pentacarbamate were added, and the materials were stirred and heated. After the materials were completely dissolved, some lithium hydroxide and calcium hydroxide solution were added, and the temperature was raised to 90°C. The reaction was carried out at this temperature for 1.5 hours, and then the temperature was raised to 105°C. The remaining lithium hydroxide solution was added, and the temperature was held at this temperature for 1 hour. The temperature was raised to 210°C, and after holding at this temperature for 3 minutes, 400 kg of compound base oil was added and the mixture was rapidly cooled. After rapid cooling, the temperature was held at this temperature for 30 minutes. After the temperature dropped below 160°C, 24 kg of antioxidant and 48 kg of metal inorganic nanocompound were added. When the temperature dropped to 100°C, 24 kg of rust inhibitor was added, and the mixture was circulated and filtered while being homogenized using a homogenizer. After filtration and homogenization, degassing was performed. After post-treatment and when the appearance was qualified, the mixture was bottled through the filling pipeline, thus obtaining sample 3.
[0050] Example 4 This embodiment first provides a lubricating grease composition, comprising the following components in parts by weight: (1) 80 parts of compound base oil, wherein the mass ratio of ester oil and polyalphaolefin synthetic oil is 50:50.
[0051] (2) Mixed soap thickener: 14 parts, wherein the mass ratio of 12-hydroxystearic acid lithium soap and 25-carbon dicarboxylic acid lithium soap is 4.5:1.
[0052] (3) Antioxidant: 2.5 parts, wherein the mass ratio of organoselenide and dilaurate thiodipropionate is 1:2.
[0053] (4) Metal inorganic nanocompounds: 5 parts; the metal inorganic nanocompounds are multilayer two-dimensional crystal Nb2C nanomaterials.
[0054] (5) Rust inhibitor: 2.5 parts, wherein the mass ratio of dodecenyl succinic acid and N-oleoyl sarcosine octadecylamine salt is 1:6.
[0055] This embodiment further provides a method for preparing the lubricating grease composition, comprising the following steps: Before production, 55 kg of lithium hydroxide was diluted with 270 kg of water and heated for later use. 400 kg of compound base oil was added to the reactor. 385 kg of 12-hydroxystearic acid and 85 kg of pentacarbamate were added, and the materials were stirred and heated. After the materials were completely dissolved, some lithium hydroxide and calcium hydroxide solution was added, and the temperature was raised to 90°C. The reaction was carried out at this temperature for 1.5 hours, and then the temperature was raised to 105°C. The remaining lithium hydroxide solution was added, and the temperature was held at this temperature for 1 hour. The temperature was raised to 210°C, and after holding at this temperature for 3 minutes, 400 kg of compound base oil was added and the mixture was rapidly cooled. After rapid cooling, the temperature was held at this temperature for 30 minutes. After the temperature dropped below 160°C, 26 kg of antioxidant and 52 kg of metal inorganic nanocompound were added. When the temperature dropped to 100°C, 26 kg of rust inhibitor was added, and the mixture was circulated and filtered while being homogenized using a homogenizer. After filtration and homogenization, degassing was performed. After post-treatment and when the appearance was qualified, the mixture was bottled through the filling pipeline, thus obtaining sample 4.
[0056] Example 5 This embodiment first provides a lubricating grease composition, comprising the following components in parts by weight: (1) 85 parts of compound base oil, of which the mass ratio of ester oil and polyalphaolefin synthetic oil is 60:40.
[0057] (2) Mixed soap thickener: 16 parts, wherein the mass ratio of 12-hydroxystearic acid lithium soap and 25-carbon dicarboxylic acid lithium soap is 5:1.
[0058] (3) Antioxidant: 3 parts, wherein the mass ratio of organoselenide and dilaurate thiodipropionate is 1:3.
[0059] (4) Metal inorganic nanocompounds: 6 parts; the metal inorganic nanocompounds are multilayer two-dimensional crystal Nb2C nanomaterials.
[0060] (5) Rust inhibitor: 3 parts, wherein the mass ratio of dodecenyl succinic acid and N-oleoyl sarcosine octadecylamine salt is 1:8.
[0061] This embodiment further provides a method for preparing the lubricating grease composition, comprising the following steps: Before production, 60 kg of lithium hydroxide was diluted with 300 kg of water and heated for later use. 450 kg of compound base oil was added to the reactor. 315 kg of 12-hydroxystearic acid and 63 kg of pentacarbamate were added, and the materials were stirred and heated. After the materials were completely dissolved, some lithium hydroxide and calcium hydroxide solution was added, and the temperature was raised to 90°C. The reaction was carried out at this temperature for 1.5 hours, and then the temperature was raised to 105°C. The remaining lithium hydroxide solution was added, and the temperature was held at this temperature for 1 hour. The temperature was raised to 210°C, and after holding at this temperature for 3 minutes, 350 kg of compound base oil was added and the mixture was rapidly cooled. After rapid cooling, the temperature was held at this temperature for 30 minutes. After the temperature dropped below 160°C, 39 kg of antioxidant and 78 kg of metal inorganic nanocompound were added. When the temperature dropped to 100°C, 39 kg of rust inhibitor was added, and the mixture was circulated and filtered while being homogenized using a homogenizer. After filtration and homogenization, degassing was performed. After post-treatment and when the appearance was qualified, the mixture was bottled through the filling pipeline, thus obtaining sample 5.
[0062] Example 6 This embodiment provides a grease composition that differs from the composition and preparation method of Example 1 only in that the mass ratio of 12-hydroxystearic acid lithium soap and 25-carbon dicarboxylic acid lithium soap in the thickener is 6:1.
[0063] Example 7 This embodiment provides a lubricating grease composition, which differs from the composition and preparation method of Example 1 only in that: the multilayer two-dimensional crystalline Nb2C nanomaterial is replaced with an equal amount of GaN material, and its preparation method includes the following steps: Loose, gray powdered GaN can be obtained by heating metallic Ga at 1050–1100 °C for 30 min in an ammonia stream. The addition of ammonium carbonate provides gas to agitate the liquid metal and promotes contact with the nitriding agent.
[0064] Example 8 This embodiment provides a lubricating grease composition, which differs from the composition and preparation method of Example 1 only in that the lithium 25-carbohydrate dicarboxylic acid soap is replaced with an equal amount of 18-carbohydrate dicarboxylic acid.
[0065] Example 9 This embodiment provides a lubricating grease composition, which differs from the composition and preparation method of Example 1 only in that the compound base oil is replaced with an equal amount of mineral base oil.
[0066] Comparative Example 1 This comparative example provides a grease composition that differs from the composition and preparation method of Example 1 only in that the inorganic metal nanocompound is replaced by a compound base oil, a mixed soap thickener, an antioxidant, and a rust inhibitor in proportion to ensure that the total amount of the grease composition remains unchanged.
[0067] Test case The present invention further tested the performance of the lubricating greases in the embodiments and comparative examples, as detailed in Table 1.
[0068] Table 1 The following conclusions can be drawn: (1) Judging from the data of extended working cone penetration, the present invention has excellent mechanical stability and can meet the requirements of stable lubrication under high speed conditions. Compared with the comparative example, it has better performance. (2) As can be seen from the corrosion and anti-corrosion test structure, the present invention has good protective performance and provides better protection for bearings; (3) It can be seen from the dropping point and the oil separation data of the steel mesh that the present invention has good high temperature resistance and can meet the requirements of temperature rise during bearing operation. Compared with the comparative example, it has better performance. (4) The test data on moisture content and water loss show that the present invention has a stable structure and good water resistance, which can meet the requirements of high-speed heavy-duty bearings under harsh working conditions and long service life. (5) It can be seen from the extreme pressure anti-wear performance data PD and PB values that the present invention has excellent extreme pressure performance, which can meet the working requirements of high load, and its performance is better than that of the comparative example. (6) The bench test data of FE8, V2F, FE9, etc. show that the lubrication performance, anti-wear performance and lubrication life of the product of the present invention are excellent and superior to the comparative example.
[0069] (7) Based on the oxidation stability test data, the present invention has good antioxidant properties, which are superior to those of the comparative example.
[0070] In summary, based on the monitoring and analysis data of the embodiments, the comparative analysis data with the comparative examples, and the bench test data, it can be seen that the present invention has excellent mechanical stability, extreme pressure anti-wear performance, structural stability, and ultra-long lubrication life, effectively meeting the working requirements of traction motor bearings under harsh environments such as high speed, long operating time, and humidity.
[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A lubricating grease composition, characterized in that, include: Base oil, thickener, inorganic metal nanocompounds, and additives; the general structural formula of the inorganic metal nanocompounds is A. x B y , where A x B is an inorganic nano-metal atom. y The inorganic nano-nonmetallic atoms include Zr, Nb, Ti, Ga or Co, and the inorganic nano-nonmetallic atoms include O, S or C, where x is any value from 1 to 3 and y is any value from 1 to 3.
2. The lubricating grease composition according to claim 1, characterized in that, Based on the total mass of the grease composition, the amount of the metal inorganic nanocompound is 2-6 wt%.
3. The lubricating grease composition according to claim 1, characterized in that, The thickener comprises lithium 12-hydroxystearate soap and C 25 ~C 30 The long-chain dicarboxylic acid lithium soap; preferably, in the thickener, the 12-hydroxystearic acid lithium soap and C 25 ~C 30 The mass ratio of long-chain dicarboxylic acid lithium soap is 1~6:
1.
4. The lubricating grease composition according to any one of claims 3, characterized in that, The thickener consists of 12-hydroxystearic acid and C. 25 ~C 30 It is formed by saponification of long-chain dicarboxylic acids with lithium hydroxide and calcium hydroxide; 12-hydroxystearic acid, C 25 ~C 30 The ratio of the total mass of the long-chain dicarboxylic acid to the total mass of lithium hydroxide and calcium hydroxide is 10:1~5.
5. The lubricating grease composition according to any one of claims 1 to 4, characterized in that, The base oils include ester oils and polyalphaolefin synthetic oils; Preferably, in the base oil, the mass ratio of the ester oil to the polyalphaolefin synthetic oil is 20~50:50~80; Preferably, the viscosity of the base oil at 40°C is 90~120 mmHg. 2 / s.
6. The lubricating grease composition according to any one of claims 1 to 4, characterized in that, The grease composition comprises the following components in parts by weight: Base oil 60-85 parts; Thickener 8-16 parts; 2-6 parts of metal-inorganic nanocompounds.
7. The lubricating grease composition according to any one of claims 1 to 4, characterized in that, The grease composition also contains an antioxidant, which comprises an organoselenide and dilaurate thiodipropionate in a mass ratio of 1:(1~5). And / or, the grease composition further contains a rust inhibitor comprising dodecenyl succinic acid and N-oleoyl sarcosine octadecylamine salt in a mass ratio of 1:(1~10).
8. The grease composition according to claim 7, characterized in that, The grease composition comprises the following components in parts by weight: Base oil 60-85 parts; Thickener 8-16 parts; Antioxidant 1-3 parts; 2-6 parts of metal-inorganic nanocompounds; Rust inhibitor 1-5 parts.
9. A method for preparing the lubricating grease composition according to any one of claims 1 to 8, characterized in that, include: (1) Mix some base oil with 12-hydroxystearic acid and long-chain dicarboxylic acid, and heat to melt the materials; Then, some lithium hydroxide solution and calcium hydroxide solution are added, and a saponification reaction is carried out at 90~105℃; (2) Add the remaining lithium hydroxide solution and calcium hydroxide solution, and continue to heat to 105~110℃ to carry out the composite reaction; after the composite reaction, heat to 200~220℃ for constant temperature. (3) Add some base oil and quench it quickly. After quenching, keep it at a constant temperature. Then add metal inorganic nano compounds and antioxidants below 160°C. After stirring evenly, cool it down. Add rust inhibitors when the temperature drops below 110°C. After stirring the additives evenly, perform post-treatment operations such as filtration, homogenization, and degassing. (4) After post-processing, the product is filled through the filling pipeline.
10. The application of the grease composition according to any one of claims 1 to 8 or the grease composition prepared by the preparation method according to claim 9 in traction motor bearings.