Liquid metal-based ionic oil gel lubricant and its preparation method and application

Abstract

The present invention relates to a liquid metal-based ionic oil gel lubricant and a preparation method and application thereof, belonging to the technical field of lubricating additives. The preparation method comprises the following steps: subjecting liquid metal to directional ultrasonic treatment to form liquid metal micro-nano droplets, dispersing the droplets into a dimethyl sulfoxide solution, adding a urea monomer, octadecyl methacrylate and [VBBIm]+[NTf2]- ionic liquid to carry out free radical polymerization to obtain a liquid metal-based ionic polymer gel factor; and adding the liquid metal-based ionic gel factor to a base oil to form an oil gel through hydrogen bond interaction, electrostatic interaction and cross-linking of the liquid metal, thereby avoiding the secondary dispersion and sedimentation problems of nano-additives and significantly improving the friction reduction and anti-wear properties of the lubricant.

Description

Technical Field

[0001] The invention belongs to the technical field of lubricating additives, and in particular relates to a liquid metal-based ionic oil gel lubricant and a preparation method and application thereof. Background Art

[0002] From daily walking to large-scale integrated electric propulsion of aircraft carriers, friction and wear are ubiquitous. However, excessive friction and wear often cause mechanical equipment failure, result in large amounts of energy loss, and increase greenhouse gas emissions. Lubrication is one of the important research directions of tribology. The preparation of high-performance lubricating materials is of great significance to extending the service life of mechanical equipment, improving energy utilization, and promoting the realization of the "dual carbon" goals and contemporary economic development. Lubricating oil, as a common liquid lubricant, is widely used in various types of mechanical equipment to reduce friction and protect mechanical workpieces. However, a single lubricant is difficult to meet the actual working conditions and is prone to high energy loss and machine wear. The use of friction modifiers is an effective measure to solve this problem.

[0003] Gallium-based liquid metal (GLM) is a new class of multifunctional materials with a melting point near or below room temperature. Its low toxicity, high thermal stability, excellent electrical and thermal conductivity, and unique chemical properties make it a promising new lubricant. However, due to the high density of GLM micro- and nano-droplets, they can aggregate and settle after prolonged periods of static storage, significantly limiting their practical applications in tribology. Summary of the Invention

[0004] In response to the problems existing in the prior art, the present invention provides a liquid metal-based ionic oil gel lubricant and a preparation method thereof. It adopts a one-step free radical polymerization synthesis method, which is simple in preparation and avoids the redispersion problem of traditional nano-additives. The obtained oil gel has long-term dispersion stability and significantly improves the friction reduction and anti-wear properties.

[0005] In one aspect, the present invention provides a method for preparing a liquid metal-based ionic oil gel lubricant, which specifically comprises the following steps:

[0006] Step 1: adding liquid metal to the mixed solution and subjecting it to directional ultrasonic treatment for a period of time to obtain liquid metal micro-nano droplets;

[0007] Step 2: First, drop the liquid metal micro-nano droplets into the dimethyl sulfoxide solution, and then add the polymerization monomer to carry out a free radical polymerization reaction to obtain a liquid metal-based ionic polymer gel factor;

[0008] Step 3: Add the liquid metal-based ionic polymer gel factor into the base oil and heat it to obtain a liquid metal-based ionic oil gel lubricant.

[0009] Furthermore, the liquid metal is gallium-based liquid metal.

[0010] Furthermore, the mixed solution in step 1 is a mixed solution of deionized water and anhydrous ethanol, and the mixing ratio thereof is 1:0.5-1.5.

[0011] Furthermore, the operating frequency of the directional ultrasound in step 1 is 20-100 kHz, the ultrasound time is 30-60 minutes, and the temperature is 0-20°C.

[0012] Furthermore, the polymerization monomers in step 2 are urea monomers, octadecyl methacrylate and [VBBIm]+[NTf2]− ionic liquid, the molar ratio of which is 5:5:0-2, and the mass ratio of the liquid metal to the polymerization monomer is 1:7-10.

[0013] Furthermore, the reaction time of the free radical polymerization reaction in step 2 is 12-48 h, and the reaction temperature is 55-85°C.

[0014] Furthermore, the base oil in step three is one of polyalphaolefin base oil PAO, polyethylene glycol base oil PEG, mineral base oil 500SN, and mineral base oil 500N.

[0015] Furthermore, in step 3, the mass ratio of the base oil to the liquid metal-based ionomer gel factor is 100:3-6, the heating temperature is 50-80° C., and the heating time is 20-60 min.

[0016] The present invention also provides a liquid metal-based ionic oil gel lubricant prepared by the method.

[0017] The present invention also provides application of the liquid metal-based ionic oil gel lubricant in mechanical moving parts.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention utilizes gel factors to self-assemble in lubricating oil to form a stable gel system, restricting the movement of lubricating oil molecules with an intricate three-dimensional network structure, improving the self-aggregation and sedimentation of liquid metal micro-nano droplets, and giving them good dispersion stability, providing a universal and reliable strategy for solving the long-term dispersion stability of nano-additives in base oil.

[0020] 2. The present invention introduces ionic liquid into the gel factor through free radical polymerization, promotes the self-assembly of supramolecular gel through hydrogen bonding interactions between urea groups and electrostatic interactions between ionic liquids, enhances the cross-linking of the gel system, and significantly improves the friction reduction and anti-wear properties of the supramolecular oil gel lubricant.

[0021] 3. This invention directly prepares a liquid metal-based ionic oleogel lubricant through a one-step process. Unlike traditional mechanical composite nanomaterials and oleogel lubricants, the gallium-based liquid metal micro-nano droplets, after directed ultrasound treatment, contain free radicals that can directly graft onto polymer gelators, effectively increasing the bond strength between the liquid metal micro-nano droplets and the polymer gelator. Furthermore, the crosslinking of the liquid metal micro-nano droplets enhances the structural compatibility and functional synergy of the nano-oleogel system, avoiding the secondary dispersion problem of the nanomaterial in the supramolecular oleogel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 : The appearance of the liquid metal-based ionic oil gel lubricant prepared in Examples 7-9 of the present invention, wherein a is the appearance of GLM@IGel-0, b is the appearance of GLM@IGel-1, and c is the appearance of GLM@IGel-2;

[0023] Figure 2 3 are SEM morphology images of the self-assembled structures of the liquid metal-based ionic oil gel lubricants prepared in Examples 1-3 of the present invention, wherein a is the SEM morphology image of the self-assembled structure of GLM@IGel-0, b is the SEM morphology image of the self-assembled structure of GLM@IGel-1, and c is the SEM morphology image of the self-assembled structure of GLM@IGel-2;

[0024] Figure 3 The friction coefficient curves and wear volume comparison results after constant load testing of the liquid metal-based ionic oil gels prepared in Examples 7-9 of the present invention and the base oil PAO10, wherein a is a friction coefficient curve graph, and b is a bar graph of the wear volume comparison results after constant load testing;

[0025] Figure 4 1 is a graph showing a variable load tribological test of the liquid metal-based ionic oil gel prepared in Examples 7-9 of the present invention and the base oil PAO10;

[0026] Figure 5 7-9 of the present invention and the variable frequency tribology test graph of the liquid metal-based ionic oil gel and the base oil PAO10;

[0027] Figure 6 This is a temperature-dependent tribological test diagram of the liquid metal-based ionic oil gel prepared in Examples 7-9 of the present invention and the base oil PAO10. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative work also fall within the scope of protection of the present disclosure.

[0029] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the specification and the relevant art, and will not be interpreted in an idealized or overly formal manner unless otherwise explicitly defined herein.

[0030] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] The present invention provides a method for preparing a liquid metal-based ionic oil gel lubricant, which specifically comprises the following steps:

[0032] Step 1: adding liquid metal to the mixed solution and subjecting it to directional ultrasonic treatment for a period of time to obtain liquid metal micro-nano droplets;

[0033] Step 2: First, drop the liquid metal micro-nano droplets into the dimethyl sulfoxide solution, and then add the polymerization monomer to carry out a free radical polymerization reaction to obtain a liquid metal-based ionic polymer gel factor;

[0034] Step 3: Add the liquid metal-based ionic polymer gel factor into the base oil and heat it to obtain a liquid metal-based ionic oil gel lubricant.

[0035] In the present invention, the mixed solution in step 1 is a mixed solution of deionized water and anhydrous ethanol, and the mixing ratio is preferably 1:0.5-1.5, for example, 1:0.5, 1:1, 1:1.5; the operating frequency of the directional ultrasound in step 1 is preferably 20-100 kHz, the ultrasound time is preferably 30-60 min, for example, 30 min, 40 min, 50 min, 60 min, and the temperature is preferably 0-20 ° C, for example, 0 ° C, 10 ° C, 15 ° C, 20 ° C; the polymerization monomer in step 2 is urea monomer, octadecyl methacrylate and [VBBIm] + [NTf2] − ionic liquid, and the molar ratio is preferably 5:5:0-2, for example, 5:5:0, 5:5:1, 5:5:2, and the mass ratio of liquid metal to polymerization monomer is preferably 1:7-10, for example, 1:7, 1:8, 1:9, 1:10; the reaction time of the free radical polymerization reaction in step 2 is preferably 12-48 h, for example, it can be 12 h, 24 h, 36 h, 48 h, the reaction temperature is 55-85 ℃, for example, it can be 55 ℃, 65 ℃, 70 ℃, 80 ℃, 85 ℃; the base oil in step 3 is preferably one of polyα-olefin base oil PAO, polyethylene glycol base oil PEG, mineral base oil 500SN, and mineral base oil 500N; the mass ratio of the base oil to the liquid metal-based ionomer gel factor in step 3 is preferably 100:3-6, for example, it can be 100:3, 100:4, 100:5, 100:6, the heating temperature is preferably 50-80 ℃, for example, it can be 50 ℃, 60 ℃, 70 ℃, 80 ℃, and the heating time is preferably 20-60 min, for example, it can be 20 min, 30 min, 40 min, 50 min, 60 min.

[0036] The technical solutions of the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention: Example 1

[0037] A method for preparing a liquid metal-based ionic oil gel lubricant comprises the following steps:

[0038] Step 1: Add 200 mg of gallium-based liquid metal to a mixture of deionized water and anhydrous ethanol in a 1:1 ratio. Place the mixture under external circulation cooling at 20°C, perform directed sonication with an ultrasonic probe for 30 minutes, and centrifuge to obtain gallium-based liquid metal micro-nano droplets.

[0039] Step 2: Gallium-based liquid metal micro-nanodroplets were dispersed in 20 mL of dimethyl sulfoxide solution. Urea monomer (1.8 mmol), octadecyl methacrylate (1.8 mmol), and azobisisobutyronitrile (0.1 mmol) were added. The mixture was stirred at 85°C for 24 hours and washed three times with dimethyl sulfoxide and anhydrous ethanol. The resulting solid was vacuum-dried at 35°C for 12 hours and designated GLM@IGel-0. Example 2

[0040] A method for preparing a liquid metal-based ionic oil gel lubricant comprises the following steps:

[0041] Step 1: Add 200 mg of gallium-based liquid metal to a mixture of deionized water and anhydrous ethanol in a 1:1 ratio. Place the mixture under external circulation cooling at 20°C, perform directed sonication with an ultrasonic probe for 30 minutes, and centrifuge to obtain gallium-based liquid metal micro-nano droplets.

[0042] Step 2: Gallium-based liquid metal micro-nanodroplets were dispersed in 20 mL of dimethyl sulfoxide solution. Urea monomer (1.8 mmol), octadecyl methacrylate (1.8 mmol), ionic liquid (0.1 mmol), and azobisisobutyronitrile (0.1 mmol) were added. The mixture was stirred at 85°C for 24 hours and washed three times with dimethyl sulfoxide and anhydrous ethanol. The resulting solid was dried in vacuum at 35°C for 12 hours and designated GLM@IGel-1. Example 3

[0043] A method for preparing a liquid metal-based ionic oil gel lubricant comprises the following steps:

[0044] Step 1: Add 200 mg of gallium-based liquid metal to a mixture of deionized water and anhydrous ethanol in a 1:1 ratio. Place the mixture under external circulation cooling at 20°C, perform directed sonication with an ultrasonic probe for 30 minutes, and centrifuge to obtain gallium-based liquid metal micro-nano droplets.

[0045] Step 2: Gallium-based liquid metal micro-nanodroplets were dispersed in 20 mL of dimethyl sulfoxide solution. Urea monomer (1.8 mmol), octadecyl methacrylate (1.8 mmol), ionic liquid (0.2 mmol), and azobisisobutyronitrile (0.1 mmol) were added. The mixture was stirred at 85°C for 24 hours and washed three times with dimethyl sulfoxide and anhydrous ethanol. The resulting solid was vacuum-dried at 35°C for 12 hours and designated GLM@IGel-2. Example 4

[0046] A method for preparing a liquid metal-based ionic oil gel lubricant comprises the following steps:

[0047] Step 1: Add 150 mg of gallium-based liquid metal to a mixture of deionized water and anhydrous ethanol in a 1:1 ratio. Place the mixture under external circulation cooling at 0°C, perform directed sonication with an ultrasonic probe for 60 minutes, and centrifuge to obtain gallium-based liquid metal micro-nano droplets.

[0048] Step 2: Disperse gallium-based liquid metal micro-nanodroplets into 20 mL of dimethyl sulfoxide solution. Add urea monomer (1.8 mmol), octadecyl methacrylate (1.8 mmol), and azobisisobutyronitrile (0.1 mmol). Stir at 55°C for 48 hours and wash three times with dimethyl sulfoxide and anhydrous ethanol. The resulting solid is vacuum-dried at 35°C for 12 hours. Example 5

[0049] A method for preparing a liquid metal-based ionic oil gel lubricant comprises the following steps:

[0050] Step 1: Add 150 mg of gallium-based liquid metal to a mixture of deionized water and anhydrous ethanol in a ratio of 1:1.5. Place the mixture in an external circulation cooling system at 0°C, perform directed sonication with an ultrasonic probe for 60 minutes, and centrifuge to obtain gallium-based liquid metal micro-nano droplets.

[0051] Step 2: Disperse gallium-based liquid metal micro-nanodroplets into 20 mL of dimethyl sulfoxide solution. Add urea monomer (1.8 mmol), octadecyl methacrylate (1.8 mmol), ionic liquid (0.1 mmol), and azobisisobutyronitrile (0.1 mmol). Stir at 70°C for 12 hours and wash three times with dimethyl sulfoxide and anhydrous ethanol. The resulting solid is vacuum-dried at 35°C for 12 hours. Example 6

[0052] A method for preparing a liquid metal-based ionic oil gel lubricant comprises the following steps:

[0053] Step 1: Add 200 mg of gallium-based liquid metal to a mixture of deionized water and anhydrous ethanol in a ratio of 1:0.5. Place the mixture under external circulation cooling at 10°C, perform directed sonication with an ultrasonic probe for 45 minutes, and centrifuge to obtain gallium-based liquid metal micro-nanodroplets.

[0054] Step 2: Disperse gallium-based liquid metal micro-nanodroplets into 20 mL of dimethyl sulfoxide solution. Add urea monomer (1.8 mmol), octadecyl methacrylate (1.8 mmol), ionic liquid (0.2 mmol), and azobisisobutyronitrile (0.1 mmol). Stir at 85°C for 24 hours and wash three times with dimethyl sulfoxide and anhydrous ethanol. The resulting solid is vacuum dried at 35°C for 12 hours.

[0055] Examples 7-9

[0056] This example provides an application of a liquid metal-based ionic oil gel lubricant. The gel factor prepared in Examples 1-3 is dispersed in PAO10 base oil. The specific method is as follows:

[0057] 50 mg of GLM@IGel-0, GLM@IGel-1, and GLM@IGel-2 solid samples were dispersed in 950 mg of PAO10 base oil, respectively, and stirred at 70 °C for 30 min to obtain liquid metal-based ionic oil gel lubricants. Example 10

[0058] This example provides an application of a liquid metal-based ionic oil gel lubricant. The gel factor prepared in Example 4 is dispersed in 500SN base oil. The specific method is as follows:

[0059] 30 mg of gel factor solid sample was dispersed into 970 mg of 500SN base oil and ultrasonicated at 50 °C for 60 min to obtain liquid metal-based ionic oil gel lubricant. Example 11

[0060] This example provides an application of a liquid metal-based ionic oil gel lubricant. The gel factor prepared in Example 5 is dispersed in PEG400 base oil. The specific method is as follows:

[0061] 60 mg of gel factor solid sample was dispersed into 940 mg of PEG400 base oil and ultrasonicated at 80 °C for 20 min to obtain liquid metal-based ionic oil gel lubricant. Example 12

[0062] This example provides an application of a liquid metal-based ionic oil gel lubricant. The gel factor prepared in Example 6 is dispersed in PEG400 base oil. The specific method is as follows:

[0063] 60 mg of gel factor solid sample was dispersed into 940 mg of PEG400 base oil and stirred at 80 °C for 20 min to obtain liquid metal-based ionic oil gel lubricant.

[0064] Result Analysis

[0065] Figure 1 This is the appearance of the liquid metal-based ionic oil gel lubricant prepared in Examples 7-9. Figure 1 a is the appearance of GLM@IGel-0. The gel has weak self-assembly ability but still has a certain fluidity. Figure 1 b and Figure 1 c shows the appearance of GLM@IGel-1 and GLM@IGel-2, both of which exhibit good self-assembly gel properties and do not flow after inversion.

[0066] Figure 2 This is a SEM morphology of the self-assembled structure of the liquid metal-based gel factor prepared in Examples 1-3 in the base oil PAO10. Figure 2 a is the SEM morphology of the self-assembled structure of GLM@IGel-0, where the spherical micro-flower structure of fiber self-assembly can be observed. Figure 2 b is the SEM morphology of the self-assembled structure of GLM@IGel-1. After adding a small amount of ionic liquid, the self-assembled framework of the fiber structure becomes tighter and the pores are significantly reduced. Figure 2 c is the SEM morphology of the self-assembled structure of GLM@IGel-2. After continuing to increase the ionic liquid content, the gel self-assembled structure is very dense, with minimal pores, and basically no fiber structure can be observed.

[0067] To investigate the tribological properties of the prepared liquid metal-based ionic oil gel lubricants, the supramolecular oil gel lubricants GLM@IGel-0, GLM@IGel-1, and GLM@IGel-2 prepared in Examples 7-9 were subjected to SRV-5 vibration reciprocating friction and wear tests under the following conditions: load 150 N, frequency 25 Hz, temperature 50°C, stroke 1 mm, and test time 30 min. Subsequently, the morphology of the wear spots after friction was systematically characterized and evaluated using a three-dimensional optical profilometer. The wear volume was used to assess the anti-wear performance of the liquid metal-based ionic oil gel lubricants. Figure 3 Figure 1 shows the friction coefficient curves and wear volume after constant load testing for the liquid metal-based ionic oil gels prepared in Examples 1-3 and the base oil PAO10. Compared to the base oil PAO10, the friction and wear reduction properties of all three liquid metal-based ionic oil gels were significantly improved. Furthermore, with increasing ionic liquid content, the friction coefficient and wear volume showed a gradual decrease. Specifically, the friction coefficient and wear volume of GLM@IGl-0 decreased to 0.102 (46.9%) and 16.73×10-1, respectively. 4 μm 3The friction coefficient and wear volume of GLM@IGel-1 decreased to 0.097 (46.9%) and 13.28×10 4 μm 3 The friction coefficient and wear volume of GLM@IGel-2 decreased to 0.097 (46.9%) and 9.69×10 4 μm 3 (90.3%).

[0068] To further investigate the tribological properties of a liquid metal-based ionic oil-gel lubricant under different operating conditions, variable-load friction and wear tests were conducted. The variable-load test conditions were: load 50-550 N, frequency 25 Hz, temperature 50°C, and stroke 1 mm. The variable-frequency test conditions were: load 150 N, frequency 5-50 Hz, temperature 50°C, and stroke 1 mm. The variable-load test conditions were: load 50-550 N, frequency 25 Hz, temperature 40-120°C, and stroke 1 mm. Figure 4 Figures show variable load tribological tests of the liquid metal-based ionic oil gels prepared in Examples 7-9 of the present invention and base oil PAO10. Base oil PAO10 loses its lubricating effect at a load of 100 N, while oil gel GLM@IGel-0 loses its lubricating effect at a load of 450 N, oil gel GLM@IGel-1 loses its lubricating effect at a load of 400 N, and oil gel GLM@IGel-2 loses its lubricating effect at a load of 550 N. This shows that oil gel GLM@IGel-2 has a better load-bearing capacity. Figure 5 Figures show variable-frequency tribological tests of the liquid metal-based ionic oil gels prepared in Examples 7-9 of the present invention and base oil PAO10. Base oil PAO10 gradually loses lubrication at 5 Hz. However, oil gels GLM@IGel-0, GLM@IGel-1, and GLM@IGel-2 maintain low and stable friction coefficients from 5 to 50 Hz, demonstrating a wider frequency range of use. Figure 6 Figures show the temperature-dependent tribological testing of the liquid metal-based ionic oil gels prepared in Examples 7-9 of the present invention and base oil PAO10. Base oil PAO10 exhibits lubrication failure at 40°C, while oil gel GLM@IGel-0 loses its lubrication effect at 90°C. Oil gels GLM@IGel-1 and GLM@IGel-2 maintain stable friction between 40°C and 120°C, exhibiting no lubrication failure, demonstrating excellent thermal stability.

[0069] In summary, the present invention directly prepares liquid metal-based ionic oil gel lubricant by one-step free radical polymerization. Compared with traditional mechanical composite nanomaterials and oil gel lubricants, the preparation is simple and the process is simple. The liquid metal after directional ultrasound directly participates in free radical polymerization to form a covalent bond, thereby increasing the bonding strength between the liquid metal micro-nano droplets and the polymer gel factor, improving the compatibility and synergy of the nano-oil gel system, and overcoming the secondary dispersion problem of nanomaterials in the oil gel lubricant. In addition, the introduction of ionic liquid in the reaction fully utilizes the friction-reducing and anti-wear properties of the ionic liquid and its electrostatic effect on the cross-linking of the polymerization system. The liquid metal-based ionic oil gel lubricant thus prepared has good self-assembly performance and dispersion stability, and significantly improves the friction-reducing and anti-wear properties.

Claims

1. A method for preparing a liquid metal-based ionic oil gel lubricant, characterized in that: The method comprises the following steps: Step 1: adding liquid metal to a mixed solution and subjecting it to directional ultrasonic treatment for a period of time to obtain liquid metal micro-nano droplets; the liquid metal is gallium-based liquid metal; the mixed solution is a mixed solution of deionized water and anhydrous ethanol, and the mixing ratio thereof is 1:0.5-1.5; Step 2: First, drop liquid metal micro-nano droplets into a dimethyl sulfoxide solution, and then add a polymerization monomer to carry out a free radical polymerization reaction to obtain a liquid metal-based ionic polymer gel factor; the polymerization monomer is a urea monomer, octadecyl methacrylate, and [VBBIm]+[NTf2]- ionic liquid, and the molar ratio thereof is 5:5:0-2. The mass ratio of the liquid metal to the polymerization monomer is 1:7-10. The reaction time of the free radical polymerization reaction is 12-48 hours, and the reaction temperature is 55-85°C. Step 3: Add the liquid metal-based ionic polymer gel factor into the base oil and heat it to obtain a liquid metal-based ionic oil gel lubricant.

2. The method for preparing a liquid metal-based ionic oil gel lubricant according to claim 1, characterized in that: The operating frequency of the directional ultrasound in step 1 is 20-100 kHz, the ultrasound time is 30-60 min, and the temperature is 0-20°C.

3. The method for preparing a liquid metal-based ionic oil gel lubricant according to claim 1, characterized in that: The base oil in step 3 is one of polyalphaolefin base oil PAO, polyethylene glycol base oil PEG, mineral base oil 500SN, and mineral base oil 500N.

4. The method for preparing a liquid metal-based ionic oil gel lubricant according to claim 1, characterized in that: In step 3, the mass ratio of the base oil to the liquid metal-based ionomer gel factor is 100:3-6, the heating temperature is 50-80° C., and the heating time is 20-60 min.

5. A liquid metal-based ionic oil gel lubricant prepared by the method for preparing a liquid metal-based ionic oil gel lubricant according to any one of claims 1 to 4.

6. Use of the liquid metal-based ionic oil gel lubricant according to claim 5 in mechanical moving parts.

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