Steel / polymer interface anti-creeping nanowire-based lubricant and preparation method thereof

Abstract

The invention discloses a steel / polymer interface anti-creeping nanowire-based lubricant and a preparation method, and relates to the technical field of lubricants, and the lubricant is formed by mixing and doping a liquid lubricant, a curing agent and an additive according to a certain proportion. According to the invention, a common liquid lubricant is used as base oil, a curing agent and an additive are added, and the mixture is simply heated and stirred and regulated to a proper ratio, so that rapid super lubrication of a steel / polymer interface is successfully realized. According to the invention, the steel / polymer interface lubricant can be effectively prevented from creeping, and super lubrication can be realized in a short time. Through innovative material formula and process optimization, the stability of the lubricant can be greatly improved, the service life of the lubricant can be greatly prolonged, meanwhile, the preparation cost is reduced, and the lubricant has wide application prospects.

Description

Technical Field

[0001] The present invention belongs to the technical field of lubricants, and in particular relates to a steel / polymer interface anti-creep nanowire-based lubricant and a preparation method thereof. Background Art

[0002] At present, the superlubrication of steel / polymer friction pairs is mainly achieved through liquid lubricants. At present, researchers have synthesized two green proton-type ionic liquids, which are used as lubricants to achieve macroscopic superlubrication on the surface of steel / PTFE friction pairs. Although certain achievements have been made in reducing the friction of polymer materials, it is still challenging to achieve macroscopic solid ultra-low friction in polymers. And under actual working conditions, the creep problem of liquid lubricants greatly limits their application scenarios. Confining liquid lubricants is an effective way to achieve anti-creep. By adding thickeners, gel factors, low-dimensional materials, etc., liquid lubricating materials such as base oils and esters can be converted into solids or semi-solids. The process of preparing traditional greases using thickeners is already quite mature, but the preparation process of greases is very complicated, and there are many influencing factors in the preparation process, which increases the R&D cost and the cost of use.

[0003] In summary, these semi-solid lubricants still face challenges such as complex preparation processes, and numerous factors influence the production process, resulting in high R&D and production costs. Furthermore, during friction, achieving superlubricity requires a long run-in period, which can lead to wear of the friction pair materials. Summary of the Invention

[0004] The present invention discloses a nanowire-based lubricant for preventing creep at the steel / polymer interface and a preparation method. A common liquid lubricant is used as a base oil, a curing agent and additives are added, and after simple heating and stirring, the mixture is adjusted to a suitable ratio to successfully achieve rapid superlubrication at the steel / polymer interface. The present invention can effectively prevent the creep of the lubricant at the steel / polymer interface and achieve superlubrication in a short period of time. Through innovative material formulations and process optimization, the present invention can significantly improve the stability and service life of the lubricant while reducing preparation costs, and has broad application prospects.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] A nanowire-based lubricant for preventing creep at the interface of steel / polymer is prepared by mixing and doping a liquid lubricant, a curing agent and an additive in a certain proportion.

[0007] Preferably, the liquid lubricant is a mixture of one or more of polyalphaolefin, polyol ester, paraffin oil, polyethylene glycol, and perfluoropolyether.

[0008] Preferably, the curing agent is one or a mixture of phosphomolybdic acid curing agent, phosphotungstic acid curing agent, and silicotungstic acid curing agent.

[0009] Preferably, the additive is one or a mixture of stearic acid, 12-hydroxystearic acid, ethylene bisstearamide, and dodecanedioic acid.

[0010] Preferably, the liquid lubricant accounts for 10 to 13 parts; the curing agent accounts for 5 to 9 parts; and the additive accounts for 1 to 2 parts.

[0011] A method for preparing a curing agent in a nanowire-based lubricant for anti-creep at a steel / polymer interface comprises: preparing the curing agent by a one-step synthesis method, selecting at least one of the following components: Group A: oleic acid, linoleic acid, linolenic acid, and oleylamine; Group B: 1-octadecene and 1-dodecene among long-chain α-olefins; Group C: cesium nitrate, ferric nitrate, copper nitrate, and calcium nitrate; and Group D: phosphomolybdic acid, phosphotungstic acid, and silicotungstic acid; and subjecting the mixture to magnetic stirring at room temperature for 8 to 12 hours to prepare the curing agent.

[0012] Preferably, in the preparation of the curing agent, the mass ratio of the selected components of group A, group B, group C and group D is: 36:95:1:10.

[0013] A method for preparing a nanowire-based lubricant for anti-creeping at a steel / polymer interface comprises the following steps: mixing a curing agent and a liquid lubricant in a set ratio; adding a certain amount of additives in the set ratio, heating and stirring at 80°C-150°C for 10-20 minutes; cooling to room temperature, and standing for 1-2 hours to obtain the desired semi-solid lubricant.

[0014] The beneficial effects of the steel / polymer interface anti-creep nanowire-based lubricant and preparation method of the present invention are:

[0015] 1. The present invention can effectively prevent the lubricant from creeping during use, thereby improving the stability and service life of the lubricant.

[0016] 2. The present invention can achieve super lubrication in a short period of time, and the friction coefficient can be quickly reduced to below 0.01, significantly reducing the wear of the friction pair.

[0017] 3. The preparation process of the present invention is simple, easy to mass produce, has low production cost, and does not require complicated equipment and technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figures are physical pictures of common liquid lubricants and the semi-solid lubricant (grease) provided by the present invention, wherein 1 is a common liquid lubricant and 2 is the semi-solid lubricant of the present invention;

[0019] Figure 2 The process steps of the semi-solid lubricant of the present invention are described;

[0020] Figure 3 A graph showing the change in friction coefficient of the semi-solid lubricant provided in Example 10 over time;

[0021] Figure 4 A graph showing the change in friction coefficient of the semi-solid lubricant provided in Example 11 over time;

[0022] Figure 5 Comparison of creep performance between the present invention and base oil (base oil on the left). DETAILED DESCRIPTION

[0023] The following description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0024] The following embodiments may be understood as individually expressing a part of a local structure or method of the present invention, or may be understood as a combination of the embodiments to explain the connotation of a larger structure or method of the present invention.

[0025] Example 1

[0026] A nanowire-based lubricant for preventing creep at the interface of steel / polymer is prepared by mixing and doping a liquid lubricant, a curing agent and an additive in a certain proportion.

[0027] Example 2

[0028] Based on Example 1, this example discloses several specific embodiments of the liquid lubricant, including: Implementation A1, the liquid lubricant is polyalphaolefin; Implementation A2, the liquid lubricant is polyol ester; Implementation A3, the liquid lubricant is paraffin oil; Implementation A4, the liquid lubricant is polyethylene glycol; Implementation A5, the liquid lubricant is perfluoropolyether; it is understandable that one or more of the mixed liquids can be selected for use as needed.

[0029] Example 3

[0030] Based on Example 1, this example discloses several specific embodiments of the curing agent, including: embodiment B1, the curing agent refers to a phosphomolybdic acid curing agent; embodiment B2, the curing agent refers to a phosphotungstic acid curing agent; embodiment B3, the curing agent refers to silicotungstic acid; it is understandable that one or a mixture of the above curing agents can be selected as needed.

[0031] Example 4

[0032] Based on Example 1, this example discloses several embodiments of the additive, including: embodiment C1, the additive refers to stearic acid; embodiment C2, the additive refers to 12-hydroxystearic acid; embodiment C3, the additive refers to ethylene bisstearamide; embodiment C4, the additive refers to dodecanedioic acid; it is understandable that one or more mixtures thereof can be selected according to needs.

[0033] Example 5

[0034] Based on the above embodiments 1-4, this embodiment discloses that: the liquid lubricant accounts for 10 parts; the curing agent accounts for 5 parts; and the additive accounts for 1 part.

[0035] Example 6

[0036] Based on the above embodiments 1-4, this embodiment discloses that: the liquid lubricant accounts for 13 parts; the curing agent accounts for 9 parts; and the additive accounts for 2 parts.

[0037] Example 7

[0038] Based on Example 3, this embodiment discloses: a method for preparing a curing agent in a steel / polymer interface anti-creep nanowire-based lubricant, comprising: preparing by a one-step synthesis method, selecting at least one of the following components from Group A: oleic acid, linoleic acid, linolenic acid, oleylamine; Group B: long-chain α-olefins (1-octadecene, 1-dodecene); Group C: cesium nitrate, ferric nitrate, copper nitrate, calcium nitrate; and Group D: phosphomolybdic acid, phosphotungstic acid, and silicotungstic acid, and subjecting the mixture to magnetic stirring at room temperature for 8 to 12 hours to prepare the curing agent.

[0039] In the preparation of the curing agent, the mass ratio of the selected components of group A, group B, group C, and group D is: 36:95:1:10.

[0040] Example 8

[0041] Based on Examples 1-7 above, this Example discloses a method for preparing a nanowire-based lubricant for anti-creeping at a steel / polymer interface, comprising the following steps: mixing a curing agent and a liquid lubricant in a predetermined ratio; adding a predetermined amount of additives in the predetermined ratio, heating and stirring at 80°C for 10 minutes; cooling to room temperature, and allowing the mixture to stand for 1 hour to obtain the desired semi-solid lubricant. By optimizing the stirring speed, temperature control, and additive ratio, the lubrication performance of the semi-solid lubricant can be optimized, wear during the run-in period can be reduced, and a superlubrication state can be rapidly achieved.

[0042] Example 9

[0043] Based on Examples 1-7 above, this embodiment discloses a method for preparing a nanowire-based lubricant for anti-creeping at a steel / polymer interface, comprising the following steps: mixing a curing agent and a liquid lubricant in a predetermined ratio; adding a predetermined amount of additives in the predetermined ratio, heating and stirring at 150°C for 20 minutes; cooling to room temperature, and allowing the mixture to stand for 2 hours to obtain the desired semi-solid lubricant. By optimizing the stirring speed, temperature control, and additive ratio, the lubrication performance of the semi-solid lubricant can be optimized, wear during the run-in period can be reduced, and a superlubrication state can be rapidly achieved.

[0044] Example 10

[0045] 5g of phosphomolybdic acid curing agent was added to 5g of polyalphaolefin, the mixture was thoroughly stirred, and then 0.75g of 12-hydroxystearic acid was added. The liquid lubricant accounted for 50%, the curing agent accounted for 45%, and the additive accounted for 5%. The mixture was heated and stirred at 80°C for 10 minutes, and then allowed to stand at room temperature for 1 hour to obtain a novel semi-solid lubricant. The phosphomolybdic acid curing agent was prepared by magnetically stirring 4ml of linoleic acid, 15ml of 1-dodecene, 0.2g of cesium nitrate, 1g of phosphomolybdic acid, and 50ml of aqueous solution at 300 rpm.

[0046] The prepared semi-solid lubricant was subjected to tribological performance testing using a tribometer (TRB3, Anton Paar) in reciprocating mode. The upper friction pair consisted of a 10 mm diameter steel ball and the lower friction pair consisted of a PTFE 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 3 N, the frequency was 5 Hz, and the amplitude was 3 mm. The time-dependent change in the friction coefficient between steel and PTFE for the semi-solid lubricant used in this example is shown in the accompanying diagram. Figure 3 As shown in the figure, the friction coefficient reaches 0.01 at ~8 seconds and then stabilizes below 0.01, which means that the steel / PTFE friction pair achieves superlubricity.

[0047] Example 11

[0048] 4g of silicotungstic acid curing agent was added to 4g of 500SN. After thorough stirring, 0.8g of dodecanedioic acid was added. The liquid lubricant accounted for 60%, the curing agent accounted for 30%, and the additive accounted for 10%. The mixture was heated and stirred at 125°C for 10 minutes, and then allowed to stand at room temperature for 30 minutes to obtain a new semi-solid lubricant. The silicotungstic acid curing agent was prepared by magnetically stirring 4ml of oleylamine, 12ml of 1-octadecene, 0.2g of cesium nitrate, 1g of silicotungstic acid, and 50ml of aqueous solution at 300 rpm.

[0049] The prepared semi-solid lubricant was subjected to tribological testing using a TRB3 friction and wear tester (Anton Paar) in reciprocating mode. The upper friction pair consisted of a 10 mm diameter steel ball and the lower friction pair consisted of a PI 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 5 N, the frequency was 2 Hz, and the amplitude was 2 mm. The time-dependent change in the friction coefficient of the semi-solid lubricant used in this example between steel and PI is shown in the accompanying diagram. Figure 4 As shown in the figure, the friction coefficient reaches 0.01 at 0.01 seconds and then stabilizes below 0.01, which means that the steel / PTFE friction pair is superlubricated.

Claims

1. A nanowire-based lubricant for preventing creep at a steel / polymer interface, characterized by: The lubricant is prepared by mixing liquid lubricant, curing agent and additives in a certain proportion.

2. The nanowire-based lubricant for preventing creep at the steel / polymer interface according to claim 1, wherein: The liquid lubricant is a mixture of one or more of polyalphaolefin, polyol ester, paraffin oil, polyethylene glycol and perfluoropolyether.

3. The steel / polymer interface anti-creep nanowire-based lubricant according to claim 1, characterized in that: The curing agent is one or a mixture of phosphomolybdic acid curing agent, phosphotungstic acid curing agent and silicotungstic acid curing agent.

4. The steel / polymer interface anti-creep nanowire-based lubricant according to claim 1, wherein: The additive is one or a mixture of stearic acid, 12-hydroxystearic acid, ethylene bisstearamide, and dodecanedioic acid.

5. The steel / polymer interface anti-creep nanowire-based lubricant according to any one of claims 1 to 4, characterized in that: The liquid lubricant accounts for 10 to 13 parts; the curing agent accounts for 5 to 9 parts; and the additive accounts for 1 to 2 parts.

6. A method for preparing a curing agent in a nanowire-based lubricant for anti-creeping at a steel / polymer interface, comprising: The curing agent is prepared by a one-step synthesis method. At least one of the following components is selected from Group A: oleic acid, linoleic acid, linolenic acid, and oleylamine; Group B: 1-octadecene and 1-dodecene among long-chain α-olefins; Group C: cesium nitrate, ferric nitrate, copper nitrate, and calcium nitrate; and Group D: phosphomolybdic acid, phosphotungstic acid, and silicotungstic acid. The curing agent is prepared by magnetic stirring at room temperature for 8 to 12 hours.

7. The method for preparing a curing agent in a nanowire-based lubricant for preventing creep at a steel / polymer interface according to claim 6, wherein: The mass ratio of the selected components of group A, group B, group C and group D is: 36:95:1:

10.

8. A method for preparing a nanowire-based lubricant for anti-creeping at a steel / polymer interface, characterized by: The method comprises the following steps: mixing a curing agent and a liquid lubricant according to a set ratio; adding a certain amount of additives according to the set ratio, heating and stirring at 80-150°C for 10-20 minutes; cooling to room temperature, and standing for 1-2 hours to obtain the required semi-solid lubricant.

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