A lubricating oil solidifying agent and gel lubricant, and a method for preparing the same and use thereof in bearings

Abstract

The application provides a lubricating oil curing agent and a gel lubricant, a preparation method thereof and application in bearings, and relates to the technical field of lubricating materials.The lubricating oil curing agent provided by the application is prepared from raw materials including fatty acids, organic small-molecule compounds, nitrate, phosphomolybdate and water; the fatty acids include linoleic acid and / or linolenic acid, the organic small-molecule compounds include 1-octadecene and / or n-octane, and the nitrate includes one or more of strontium nitrate, iron nitrate and zirconium nitrate. The lubricating oil curing agent is added into lubricating oil, and a gel lubricant with low cost and excellent lubricating performance can be prepared by very simple operation, and batch preparation of the gel lubricant is realized. When the gel lubricant is used in bearing gears, under the conditions of high load and high-speed rotation, the gel lubricant can not only achieve good friction-reducing and wear-resisting effects, but also prevent the influence of lubricating oil flow and leakage on machines.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating materials, and in particular to a lubricating oil curing agent and a gel lubricant, a preparation method thereof, and applications in bearings. Background Art

[0002] Friction and wear are ubiquitous in daily life and industrial processes, resulting in significant energy consumption and economic losses. The development and design of lubricants with ultra-low friction and excellent anti-wear properties is crucial. Currently, lubricants can be categorized into solid lubricants and liquid lubricants, depending on the lubricant material used. Solid lubricants offer advantages such as high load-carrying capacity, excellent chemical stability, and a wide operating temperature range. However, they also have drawbacks that require improvement, such as poor thermal conductivity and the inability to replenish lubricating film loss. Liquid lubricants are widely used due to their excellent thermal conductivity, low friction coefficient, and self-healing properties, particularly oils, which are the most widely used and have the widest application range. However, the complex preparation process, low mechanical strength, and poor load-carrying capacity of most current lubricants hinder their application. Furthermore, lubricants tend to flow easily during loading and unloading, causing environmental pollution. Lubricant migration increases their exposed surface area and volatility, potentially leading to further losses and failure of lubricated components. Furthermore, lubricant leakage can increase wear on machinery, shorten its service life, and cause significant economic losses. Greases are widely used to address these issues. Although grease can alleviate leakage and creep problems, it also has many problems, such as the need to add multiple additives during the preparation process, which increases the preparation cost; speed limitations during mechanical use, oil separation, etc.

[0003] Gel lubricants have recently emerged on the scene, though research is still in its early stages. Reports have included the gelation of base oils such as PAO10 and 500SN using the gelling agent (S)-2-((1-(hexadecylamino)-4-(methylthio)-1-oxobutane-2-yl)carbamoylbenzoic acid (HMTA); and the addition of polymer fragments to PAO10 to induce self-assembly to produce a urea-containing supramolecular polymer gel lubricant. While these methods offer different approaches to gel preparation, they also suffer from drawbacks such as high cost, the need for high-temperature heating, complex preparation processes, and limitations on large-scale production. Summary of the Invention

[0004] In light of this, the present invention aims to provide a lubricating oil curing agent and a gel lubricant, as well as methods for preparing and applying the same to bearings. By adding the lubricating oil curing agent provided by the present invention to lubricating oil, a low-cost gel lubricant with excellent lubrication properties can be prepared with a very simple operation, enabling the mass production of the gel lubricant.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a lubricating oil curing agent, the preparation raw materials of which include fatty acids, organic small molecule compounds, nitrates, phosphomolybdic acid and water; the fatty acids include linoleic acid and / or linolenic acid, the organic small molecule compounds include 1-octadecene and / or n-octane, and the nitrates include one or more of strontium nitrate, ferric nitrate and zirconium nitrate.

[0007] Preferably, the usage ratio of the fatty acid, the organic small molecule compound, the nitrate, the phosphomolybdic acid and the water is (1-10) mL: (5-50) mL: (0.1-5) g: (0.5-20) g: (40-60) mL.

[0008] The present invention provides a method for preparing the lubricating oil curing agent described in the above technical solution, comprising the following steps:

[0009] The fatty acid, the organic small molecule compound, the nitrate, the phosphomolybdic acid and water are stirred and mixed to obtain the lubricating oil curing agent.

[0010] Preferably, the stirring speed of the stirring and mixing is 100 to 1600 r / min, and the stirring time is 8 to 12 hours.

[0011] The present invention provides a curing agent-based gel lubricant, comprising a lubricating oil and a curing agent, wherein the curing agent is the lubricating oil curing agent described in the above technical solution or the lubricating oil curing agent prepared by the preparation method described in the above technical solution.

[0012] Preferably, the lubricating oil comprises one or more of poly-α-olefin, liquid paraffin, 500SN, 500N and polyalkylated cyclopentane.

[0013] Preferably, the mass ratio of the curing agent to the lubricating oil is 1:0.1 to 1:100.

[0014] The present invention provides a method for preparing the curing agent-based gel lubricant described in the above technical solution, comprising the following steps:

[0015] The lubricating oil and the curing agent are stirred and mixed, and then allowed to stand to obtain the curing agent-based gel lubricant.

[0016] Preferably, the stirring speed of the stirring and mixing is 100 to 1000 r / min, the stirring time is 5 to 60 min, and the standing time is 1 to 5 h.

[0017] The present invention provides the use of the curing agent-based gel lubricant described in the above technical solution or the curing agent-based gel lubricant prepared by the preparation method described in the above technical solution in bearings.

[0018] The present invention provides a lubricating oil curing agent, the raw materials for preparation including fatty acids, small organic molecules, nitrates, phosphomolybdic acid, and water; the fatty acids include linoleic acid and / or linolenic acid, the small organic molecules include 1-octadecene and / or n-octane, and the nitrates include one or more of strontium nitrate, ferric nitrate, and zirconium nitrate. In the present invention, the fatty acids, small organic molecules, nitrates, and phosphomolybdic acid are combined through electrostatic and coordination interactions to form a complex three-dimensional structure, forming the curing agent.

[0019] The present invention provides a method for preparing the lubricating oil curing agent described in the above technical solution. The present invention can prepare the lubricating oil curing agent by simple stirring at room temperature.

[0020] The present invention provides a curing agent-based gel lubricant, the components of which include lubricating oil and curing agent, wherein the curing agent is the lubricating oil curing agent described in the above technical solution or the lubricating oil curing agent prepared by the preparation method described in the above technical solution. In the present invention, the curing agent, through its complex three-dimensional structure, entangles with each other to form many cavities, which wrap the lubricating oil therein, and there is also a strong interaction force between the lubricating oil and the curing agent, which causes the lubricating oil to gel. The gelling behavior causes the lubricating oil to change from a flowing liquid to a stable semi-solid, thereby preventing the lubricating oil from creeping and leaking. The curing agent-based gel lubricant provided by the present invention has excellent lubricating properties, outstanding friction reduction and anti-wear effects, and can greatly reduce damage to friction pairs; and the curing agent-based gel lubricant provided by the present invention has good stability, and will not separate oil even after high-speed centrifugation or long-term standing; in addition, the curing agent-based gel lubricant provided by the present invention is cheap to manufacture and has low cost. The curing agent-based gel lubricant provided by the present invention is used in bearing gears. Under high load conditions (the test load in the embodiment is 200N) and high-speed rotation (5000rpm high-speed centrifugal test in the embodiment), it can not only achieve good friction reduction and anti-wear effects, but also prevent the flow and leakage of lubricating oil from affecting the machine.

[0021] The present invention provides a method for preparing the curing agent-based gel lubricant described in the above technical solution. The preparation method provided by the present invention is simple to operate and only requires stirring and standing at room temperature without requiring any unnecessary operations. The method can be prepared in large quantities, and by increasing the proportion of raw materials, kilogram-level products can be prepared in the laboratory. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a physical picture of the curing agent-based gel lubricant and lubricating oil prepared in Example 1, wherein 1 is a synthetic lubricating oil and 2 is a curing agent-based gel lubricant;

[0023] Figure 2This is a graph showing the change in friction coefficient of the curing agent-based gel lubricant prepared in Example 1 over time;

[0024] Figure 3 This is a graph showing the change in friction coefficient of the curing agent-based gel lubricant prepared in Example 2 over time;

[0025] Figure 4 This is an electron microscope image of the wear spots on the surface of the lower friction pair (steel block) after rubbing for 30 minutes in Example 3;

[0026] Figure 5 This is a picture of the application of the curing agent-based gel lubricant prepared in Example 3 in a bearing. DETAILED DESCRIPTION

[0027] The present invention provides a lubricating oil curing agent, the preparation raw materials of which include fatty acids, organic small molecule compounds, nitrates, phosphomolybdic acid and water; the fatty acids include linoleic acid and / or linolenic acid, the organic small molecule compounds include 1-octadecene and / or n-octane, and the nitrates include one or more of strontium nitrate, ferric nitrate and zirconium nitrate.

[0028] In the present invention, unless otherwise specified, the raw materials involved are commercially available products well known to those skilled in the art.

[0029] In the present invention, the raw materials for preparing the lubricating curing agent preferably include linolenic acid, 1-octadecene, strontium nitrate, phosphomolybdic acid, and water; or include linoleic acid, 1-octadecene, zirconium nitrate, phosphomolybdic acid, and water; or include linolenic acid, n-octane, ferric nitrate, phosphomolybdic acid, and water. The present invention has no particular requirements for the linolenic acid; any linolenic acid known to those skilled in the art can be used.

[0030] In the present invention, the usage ratio of the fatty acid, organic small molecule compound, nitrate, phosphomolybdic acid and water is preferably (1-10) mL: (5-50) mL: (0.1-5) g: (0.5-20) g: (40-60) mL, more preferably (2-8) mL: (10-30) mL: (0.2-2) g: (0.5-5) g: (40-60) mL, and further preferably (4-5) mL: (15-24) mL: (0.2-0.4) g: (0.9-1.2) g: (40-60) mL.

[0031] In the present invention, the fatty acid, small organic molecule compound, nitrate and phosphomolybdic acid are combined together through electrostatic interaction and coordination interaction to form a complex three-dimensional structure. Specifically, the nitrate and phosphomolybdic acid are combined together through electrostatic interaction to form a main body, while the fatty acid, small organic molecule compound and the main body are combined through coordination to form a complex three-dimensional structure.

[0032] The present invention provides a method for preparing the lubricating oil curing agent described in the above technical solution, comprising the following steps:

[0033] The fatty acid, the organic small molecule compound, the nitrate, the phosphomolybdic acid and water are stirred and mixed to obtain the lubricating oil curing agent.

[0034] In the present invention, the stirring speed of the stirring and mixing is preferably 100 to 1600 r / min, more preferably 300 to 500 r / min, and the stirring time is preferably 8 to 12 hours; the stirring and mixing can be carried out at room temperature. After the stirring and mixing, the present invention also preferably washes and centrifuges the obtained product; the detergent used for the washing is preferably one or more of ethanol, acetone, cyclohexane, n-octane, and chloroform, and the number of washing times is preferably three.

[0035] The present invention provides a curing agent-based gel lubricant comprising a lubricating oil and a curing agent, wherein the curing agent is the lubricating oil curing agent described in the above technical solution or the lubricating oil curing agent prepared by the preparation method described in the above technical solution. In the present invention, the lubricating oil preferably comprises one or more of polyalphaolefin, liquid paraffin, 500SN, 500N, and polyalkylated cyclopentane; the polyalphaolefin preferably comprises one or more of polyalphaolefin-2, polyalphaolefin-4, polyalphaolefin-6, and polyalphaolefin-8; the present invention has no particular requirements for the polyalkylated cyclopentane, and polyalkylated cyclopentanes well known to those skilled in the art can be used. In the present invention, the mass ratio of the curing agent to the lubricating oil is preferably 1:0.1 to 1:100, more preferably 1:1 to 1:50, and even more preferably 1:10 to 1:20. In the present invention, the curing agent, through its complex three-dimensional structure, entangles with each other to form numerous cavities, which envelop the lubricating oil and gelate the lubricating oil. The gelation behavior transforms the lubricating oil from a flowing liquid to a stable semi-solid.

[0036] The curing agent-based gel lubricant provided by the present invention has excellent lubricating properties and outstanding friction reduction and anti-wear effects; at the same time, the semi-solid state solves problems such as the flow and creep of the lubricating oil, and can slow down the wear caused by the creep and leakage of the lubricating oil; and has good stability, and will not separate oil even after high-speed centrifugation or long-term standing.

[0037] The present invention provides a method for preparing the curing agent-based gel lubricant described in the above technical solution, comprising the following steps:

[0038] The lubricating oil and the curing agent are stirred and mixed, and then allowed to stand to obtain the curing agent-based gel lubricant.

[0039] In the present invention, the curing agent is preferably added to the lubricating oil and stirred and mixed. In the present invention, the stirring speed of the stirring and mixing is preferably 100 to 1000 r / min, the stirring time is preferably 5 to 60 minutes, and the standing time is preferably 2 hours.

[0040] The preparation method of the curing agent-based gel lubricant provided by the present invention is to mix lubricating oil and curing agent in a certain proportion. The method is easy to operate and can be prepared on a large scale in a laboratory.

[0041] The present invention provides the use of the curing agent-based gel lubricant described in the above technical solution or the curing agent-based gel lubricant prepared by the preparation method described in the above technical solution in bearings. The present invention has no particular requirements for the application method, and the application method familiar to those skilled in the art can be used. When the curing agent-based gel lubricant provided by the present invention is used in bearing gears, it can not only achieve good friction reduction and anti-wear effects under high-load conditions and high-speed rotation, but also prevent the flow and leakage of lubricating oil from affecting the machine.

[0042] To further illustrate the present invention, the lubricating oil curing agent and gel lubricant provided by the present invention, as well as their preparation methods and applications in bearings are described in detail below with reference to examples. However, these examples should not be construed as limiting the scope of protection of the present invention.

[0043] Example 1

[0044] 4 mL of linolenic acid, 24 mL of 1-octadecene, 0.2 g of strontium nitrate, 1 g of phosphomolybdic acid and 50 mL of water were stirred magnetically (500 r / min) for 8 h, washed with ethanol and chloroform and centrifuged to prepare a curing agent, which was recorded as phosphomolybdic acid curing agent.

[0045] 1 g of the above-mentioned phosphomolybdic acid curing agent was added to 10 g of synthetic lubricant polyα-olefin-2, wherein the mass ratio of the curing agent to the synthetic lubricant was 1:10. The mixed sample was then stirred at a speed of 200 r / min for 10 minutes and allowed to stand for 2 hours to obtain a curing agent-based gel lubricant.

[0046] Figure 1 This is a physical picture of the synthetic lubricant poly-α-olefin-2 and the curing agent-based gel lubricant prepared in Example 1. Figure 1 Where 1 corresponds to the synthetic lubricant poly-α-olefin-2, and 2 corresponds to the curing agent-based gel lubricant prepared in Example 1. Figure 1 It can be seen that the curing agent-based gel lubricant prepared in Example 1 does not flow when inverted.

[0047] The tribological performance of the curing agent-based gel lubricant prepared in Example 1 was tested using the reciprocating mode of an SRV-V micro-motion friction and wear tester. The upper friction pair consisted of a 10mm diameter steel ball and the lower friction pair was a steel block. Prior to the experiment, the friction pair was ultrasonically treated in an ethanol and acetone solution for 10 minutes, then rinsed with deionized water and finally dried in an oven. The test load was 200N, the frequency was 10Hz, and the amplitude was 1mm. The change in the friction coefficient of the curing agent-based gel lubricant used in this example between steel and steel over time is shown in Figure 2. Figure 2 As shown. Figure 2 It can be seen that the friction coefficient of the curing agent-based gel lubricant remains at around 0.12 during the friction process and remains stable.

[0048] The curing agent-based gel lubricant prepared in Example 1 was centrifuged at 5000 rpm for 30 minutes. No oil was separated after high-speed centrifugation, which confirmed that the curing agent-based gel lubricant had good stability.

[0049] Example 2

[0050] 5 mL of linoleic acid, 18 mL of 1-octadecene, 0.3 g of zirconium nitrate, 1.2 g of phosphomolybdic acid and 60 mL of water were stirred magnetically (300 r / min) for 10 h, washed with acetone and chloroform and centrifuged to prepare a curing agent, which was recorded as phosphomolybdic acid curing agent.

[0051] 1 g of the above-mentioned phosphomolybdic acid curing agent was added to 20 g of synthetic lubricant 500SN, wherein the mass ratio of the curing agent to the synthetic lubricating oil was 1:20. The mixed sample was then stirred and allowed to stand for 2 hours to obtain a curing agent-based gel lubricant.

[0052] The curing agent-based gel lubricant prepared in Example 2 was subjected to tribological performance testing. Specifically, the friction performance was tested using the reciprocating mode of an SRV-V micro-motion friction and wear tester. The upper friction pair consisted of a 10mm diameter steel ball and the lower friction pair was a steel block. Before the experiment, the friction pair was ultrasonically treated in an ethanol and acetone solution for 10 minutes, then rinsed with deionized water, and finally dried in an oven. The test load was 200N, the frequency was 25Hz, and the amplitude was 1mm. The change in the friction coefficient of the curing agent-based gel lubricant used in this example between steel and steel over time is shown in Figure 2. Figure 3 As shown. Figure 3 It can be seen that the friction coefficient of the curing agent-based gel lubricant remains at around 0.10 during the friction process and remains stable.

[0053] Example 3

[0054] 4 mL of linolenic acid, 15 mL of n-octane, 0.4 g of ferric nitrate, 0.9 g of phosphomolybdic acid and 40 mL of water were stirred magnetically (400 r / min) for 10 h, washed with ethanol and cyclohexane and centrifuged to prepare a curing agent, which was recorded as phosphomolybdic acid curing agent.

[0055] 0.5 g of the above-mentioned phosphomolybdic acid curing agent was added to 7.5 g of synthetic lubricating oil polyalkylated cyclopentane lubricating oil, wherein the mass ratio of the curing agent to the synthetic lubricating oil was 1:15. The mixed sample was then stirred and allowed to stand for 2 hours to obtain a curing agent-based gel lubricant.

[0056] The curing agent-based gel lubricant prepared in Example 3 was subjected to tribological testing using an SRV-V fretting friction and wear tester in reciprocating mode. The upper friction pair consisted of a 10 mm diameter steel ball, and the lower friction pair consisted of a steel block. Prior to the experiment, the friction pair was ultrasonically treated in an ethanol and acetone solution for 10 minutes, then rinsed with deionized water and dried in an oven. The test load was 300 N, the frequency was 25 Hz, the amplitude was 1 mm, and the friction time was 30 minutes. Figure 4 This is an electron microscope image of the wear spots on the surface of the lower friction pair (steel block) after 30 minutes of friction. Figure 4 It can be seen from the figure that during the friction process of the curing agent-based gel lubricant, the wear spots formed on the friction pair surface are smaller, the grooves on the wear spot surface are relatively shallow, and the wear is less.

[0057] The curing agent-based gel lubricant prepared in Example 3 was put into practical use and applied to bearings, such as Figure 5 As shown, the lubricant can be stably maintained in the bearing without overflowing, failing or separating. Moreover, when the bearing runs at a speed of 300 to 1000 r / min, no oil leakage occurs.

[0058] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation thereto. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications shall also be considered within the scope of protection of the present invention.

Claims

1. A curing agent-based gel lubricant, characterized in that: The invention comprises lubricating oil and a curing agent, wherein the curing agent is a lubricating oil curing agent, and raw materials for preparing the lubricating oil curing agent include fatty acids, organic small molecule compounds, nitrates, phosphomolybdic acid and water; the fatty acids are linoleic acid and / or linolenic acid, the organic small molecule compounds are 1-octadecene and / or n-octane, and the nitrates are strontium nitrate; the usage ratio of the fatty acids, organic small molecule compounds, nitrates, phosphomolybdic acid and water is (4-5) mL: (15-24) mL: (0.2-0.4) g: (0.9-1.2) g: (40-60) mL; and the lubricating oil comprises one or more of polyalphaolefin, liquid paraffin, 500SN, 500N and polyalkylated cyclopentane.

2. The curing agent-based gel lubricant according to claim 1, characterized in that The preparation method of the lubricating oil curing agent comprises the following steps: The fatty acid, the organic small molecule compound, the nitrate, the phosphomolybdic acid and water are stirred and mixed to obtain the lubricating oil curing agent.

3. The curing agent-based gel lubricant according to claim 2, characterized in that: The stirring speed of the stirring and mixing is 100-1600 r / min, and the stirring time is 8-12 h.

4. The curing agent-based gel lubricant according to claim 1, characterized in that The mass ratio of the curing agent to the lubricating oil is 1:0.1 to 1:

100.

5. The method for preparing the curing agent-based gel lubricant according to any one of claims 1 to 4, characterized in that: The following steps are involved: The lubricating oil and the curing agent are stirred and mixed, and then allowed to stand to obtain the curing agent-based gel lubricant.

6. The preparation method according to claim 5, characterized in that The stirring speed of the stirring and mixing is 100-1000 r / min, and the stirring time is 5-60 min; the standing time is 1-5 h.

7. Use of the curing agent-based gel lubricant according to any one of claims 1 to 4 or the curing agent-based gel lubricant prepared by the preparation method according to any one of claims 5 to 6 in bearings.

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