A lubricating oil system, its preparation method and application, and an oil-based super-slip system

Abstract

The present application belongs to the technical field of tribology, and provides a kind of lubricating oil system and its preparation method and application, oil-based super-slippery system.The lubricating oil system provided by the present application includes base oil and oil-soluble copper-based nanoparticle;The mass content of oil-soluble copper-based nanoparticle in the lubricating oil system is 0.01-5.0%.The oil-soluble copper-based nanoparticle in the lubricating oil system provided by the present application can improve the load capacity and anti-wear and friction-reducing performance of base oil as an additive;At the same time, under the action of frictional shear, the oil-soluble copper-based nanoparticle in the lubricating oil system provided by the present application can play a role in friction catalysis, promote the formation of high-performance carbon-based material, i.e., "the third body", in the friction interface and lubricating oil, thereby reducing the friction coefficient between polymer-metal pair to 10 ‑3 order of magnitude, and super-slippery phenomenon occurs, and the wear rate is at 10 ‑8 -10 ‑9 mm 3 / Nm level, reaching near-zero wear state.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tribology, in particular to a lubricating oil system, a preparation method and application thereof, and an oil-based super-slippery system. BACKGROUND

[0002] Super-slippery, which reflects near-zero friction and near-zero wear, can effectively reduce energy loss and prolong the service life of friction mechanisms, and is one of the new ideas to cope with the energy consumption and wear problems of modern industrial equipment. However, due to the severe restrictions of lubricant viscosity and friction pair materials, current liquid super-slippery mainly focuses on water-based lubrication environment, and the friction pair is mainly ceramic material. It is worth mentioning that the current industrial equipment movement mechanism is still dominated by lubricating oil and metal friction pair, especially the high viscosity and viscosity-pressure coefficient of lubricating oil, which has become the main obstacle to the application of super-slippery technology in the current industrial equipment. However, the viscosity of lubricating oil is an important factor affecting the load-carrying capacity of lubricating oil. Therefore, in order to solve this contradiction, it is of great research significance and engineering value to construct an oil-based super-slippery system based on conventional friction pairs.

[0003] On the other hand, compared with traditional metal friction pairs, polymer materials are light in weight, excellent in mechanical properties, strong in designability, and good in self-lubricating performance, and have great application potential in modern high-tech industrial fields, such as current oil-containing seals, piston bush coating / padding, bearing retainer, nuclear main pump oil lubrication thrust bearing, etc. Tribology theory and practice have shown that polymer-metal pair instead of metal-metal pair is an effective means to prevent the engagement of movement mechanism, and provides a new idea for the high-end design of mechanical movement mechanism friction pair. At the same time, polymer materials have lower cohesive energy density than metal and ceramic materials, and thus are more likely to transfer to the metal counter surface, providing sufficient carbon source for the formation of high-performance friction film, which just makes up for the shortage of carbon source at the friction interface caused by the extrusion of lubricating oil. In addition, hydrogen (H) is one of the main elements of engineering plastics, and according to the existing super-slippery theory, H is beneficial to neutralizing the unsaturated bonds formed by the friction chemistry of the friction interface, reducing the interface electron localization and interface potential, and is beneficial to the formation of high-shear performance super-slippery interface, achieving the purpose of prolonging the service life. Therefore, using polymer-metal pair instead of metal-metal, ceramic-ceramic and metal-ceramic pair has a positive effect on realizing oil-based super-slippery of the system.

[0004] However, existing literature has shown that when the polymer-metal pair runs in pure base oil, its friction coefficient is greatly reduced, but it is still between 0.1 and 0.01, and has not yet reached the super-slippery state (friction coefficient <0.01). As we all know, high-performance friction film at the friction interface, especially highly ordered carbon film (such as single-layer or multi-layer graphene, onion carbon, graphene nanorolls, etc.), is the key to realizing structural super-slippery. This is one of the main reasons why the polymer-metal pair cannot achieve super-slippery in pure base oil. SUMMARY

[0005] Therefore, the present application aims to provide a lubricating oil system, a preparation method and application thereof, and an oil-based super-slippery system.

[0006] To achieve the above-mentioned application purposes, the present application provides the following technical solutions.

[0007] The present application provides a lubricating oil system, comprising base oil and oil-soluble copper-based nanoparticles.

[0008] The mass content of the oil-soluble copper-based nanoparticles in the lubricating oil system is 0.01-5.0%.

[0009] The base oil comprises one or more of Group I base oil, Group II base oil, Group III base oil, Group IV base oil and Group V base oil.

[0010] Preferably, the base oil comprises Group IV base oil and / or Group V base oil.

[0011] Preferably, the oil-soluble copper-based nanoparticles comprise oil-soluble copper elemental nanoparticles and / or oil-soluble copper alloy nanoparticles.

[0012] The present application also provides a preparation method of the lubricating oil system according to the above-mentioned technical solutions, comprising the following steps.

[0013] The base oil and the oil-soluble copper-based nanoparticles are mixed and dispersed to obtain the lubricating oil system.

[0014] The present application also provides an application of the lubricating oil system according to the above-mentioned technical solutions in constructing an oil-based super-slippery system.

[0015] The present application also provides an oil-based super-slippery system, comprising the lubricating oil system according to the above-mentioned technical solutions and a polymer-metal pair.

[0016] Preferably, the material of the polymer friction pair in the polymer-metal pair comprises thermosetting resin material and / or thermoplastic resin material.

[0017] The thermosetting resin material comprises thermosetting resin and / or modified thermosetting resin.

[0018] The modified thermosetting resin is one or more of blended modified thermosetting resin, filled modified thermosetting resin, fiber-reinforced modified thermosetting resin, chemically modified thermosetting resin and surface-modified thermosetting resin.

[0019] The thermoplastic resin material comprises thermoplastic resin and / or modified thermoplastic resin.

[0020] The modified thermoplastic resin is one or more of a blending modified thermoplastic resin, a filling modified thermoplastic resin, a fiber reinforced modified thermoplastic resin, a chemical modified thermoplastic resin and a surface modified thermoplastic resin.

[0021] Preferably, the surface roughness of the polymer friction pair in the polymer-metal pair is 10-500 nm.

[0022] Preferably, the material of the metal friction pair in the polymer-metal pair is a ferrous metal.

[0023] The ferrous metal is bearing steel and / or stainless steel.

[0024] The bearing steel includes bearing steel GCr6, bearing steel GCr9, bearing steel GCr15 or bearing steel GCr95SiMn.

[0025] The stainless steel includes stainless steel 316, stainless steel 316L or stainless steel 304.

[0026] Preferably, the surface roughness of the metal friction pair in the polymer-metal pair is 10-500 nm.

[0027] The present application provides a lubricating oil system, comprising base oil and oil-soluble copper-based nanoparticles; the mass content of the oil-soluble copper-based nanoparticles in the lubricating oil system is 0.01-5.0%. The oil-soluble copper-based nanoparticles in the lubricating oil system provided by the present application can improve the load capacity and anti-wear and friction-reducing performance of the base oil as an additive; at the same time, under the action of frictional shear, the oil-soluble copper-based nanoparticles in the lubricating oil system provided by the present application can play a catalytic role in friction, so as to promote the formation of high-performance carbon-based materials, i.e. "third body", in the friction interface and the lubricating oil, thereby reducing the friction coefficient between the polymer-metal pair to the order of 10 -3 , and the wear rate is at the level of 10 -8 -10 -9 mm 3 / Nm, reaching the state of near-zero wear. This not only reduces the friction energy consumption of the system, but also improves the stability and reliability of the system, and prolongs the service life of the moving parts, so it has broad application prospects in oil-containing seals, piston bush coatings / gaskets, bearing retainers, nuclear main pump oil-lubricated thrust bearings and other moving mechanisms with polymer-metal as the friction pair.

[0028] The present application also provides a preparation method of the lubricating oil system described in the above technical solution, comprising the following steps: mixing base oil and oil-soluble copper-based nanoparticles, and dispersing to obtain the lubricating oil system. The preparation method provided by the present application is simple to operate.

[0029] The application further provides application of the lubricating oil system in constructing an oil-based super-slippery system.

[0030] The application further provides an oil-based super-slippery system, comprising the lubricating oil system and the polymer-metal pair. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 Evolution curve of friction coefficient in Example 1;

[0032] Figure 2 Evolution curve of friction coefficient (a) and three-dimensional topography of the wear scar on the polyether ether ketone (b) in Example 2;

[0033] Figure 3 Evolution curve of friction coefficient (a) and three-dimensional topography of the wear scar on the polyether ether ketone (b) in Example 3;

[0034] Figure 4 Evolution curve of friction coefficient (a) and three-dimensional topography of the wear scar on the polyether ether ketone (b) in Example 4;

[0035] Figure 5 Evolution curve of friction coefficient in Example 5;

[0036] Figure 6 Evolution curve of friction coefficient in Example 6. DETAILED DESCRIPTION

[0037] TERMS EXPLANATION

[0038]

Super-slippery

[0039]

Liquid super-slippery

[0040] Polymer modification: the process of adding inorganic or organic substances into polymers by physical and mechanical methods, or blending different kinds of polymers, or using chemical methods to achieve copolymerization, grafting, crosslinking, or combination of the above methods, in order to reduce the cost of materials, improve the processing performance or end-use performance, or endow the materials with unique functions in electricity, magnetism, light, heat, sound, combustion, etc.

[0041] Polymer modification method:

[0042] (1) Blending modification: the process of preparing macroscopically uniform materials by mixing two or more kinds of polymers.

[0043] (2) Filling modification: the modification technique of adding appropriate amount of filling materials (such as inorganic powder or fiber) into polymers to improve certain properties of the products or reduce the cost of raw materials.

[0044] (3) Fiber-reinforced composite material: also known as polymer-based composite material, which refers to a composite material with organic polymer as matrix and fiber as reinforcing agent.

[0045] (4) Chemical modification: a modification method in which the main chain, branch chain, side chain of polymer macromolecular chain and the chemical reaction between macromolecular chains occur during the modification process.

[0046] (5) Surface modification: a kind of modification in which the modification only occurs on the surface of polymer material products without penetrating into the interior.

[0047] The present application provides a kind of lubricating oil system, including base oil and oil-soluble copper-based nano microparticle;

[0048] The mass content of oil-soluble copper-based nano microparticle in the lubricating oil system is 0.01-5.0%;

[0049] The base oil includes one or more of the following: class I base oil, class II base oil, class III base oil, class IV base oil and class V base oil.

[0050] In the present application, the raw materials used in the present application are preferably commercially available products, unless otherwise specified.

[0051] The lubricating oil system provided by the present application comprises base oil. In the present application, the base oil comprises one or more of Group I base oil, Group II base oil, Group III base oil, Group IV base oil and Group V base oil, preferably comprises Group IV base oil and / or Group V base oil. In the present application, the Group I base oil refers to mineral base oil refined by traditional solvent refining, the Group II base oil refers to mineral base oil refined by hydrogen cracking, the Group III base oil refers to mineral base oil refined by hydrogen cracking process and wax oil isomerization, the Group IV base oil refers to synthetic base oil prepared by paraffin decomposition method and ethylene synthesis method, i.e. poly-alpha-olefin (PAO), and the Group V base oil refers to the collective term of other synthetic oils, vegetable oils and reclaimed base oils, wherein the other synthetic oils refer to synthetic oils other than poly-alpha-olefin, i.e. all non-Group I base oil, Group II base oil, Group III base oil or Group IV base oil. In the present application, the Group IV base oil preferably comprises one or more of PAO2, PAO4, PAO6, PAO8, PAO10, PAO25, PAO40 and PAO100. In the present application, the Group V base oil preferably comprises other synthetic oils, further preferably comprises one or more of synthetic esters, alkyl naphthalene, polyether and perfluoropolyether, more preferably comprises synthetic esters and / or alkyl naphthalene. In the present application, the synthetic esters preferably comprise isooctyl sebacate and / or pentaerythritol ester. In the present application, the alkyl naphthalene preferably comprises one or more of AN5, AN6, AN7, AN8, AN9, AN10, AN11, AN12, AN13, AN14, AN15, AN16, AN17, AN18, AN19 and AN20.

[0052] The lubricating oil system provided by the present application comprises oil-soluble copper-based nanoparticles. In the present application, the mass content of the oil-soluble copper-based nanoparticles in the lubricating oil system is 0.01-5.0%, preferably 0.01-3.0%, further preferably 0.05-2.5%. In the present application, the oil-soluble copper-based nanoparticles preferably comprise oil-soluble copper elemental nanoparticles and / or oil-soluble copper alloy nanoparticles, further preferably one or more of the oil-soluble copper elemental nanoparticles and oil-soluble copper alloy nanoparticles disclosed in the patent with publication number CN100579688C; specifically preferably oil-soluble surface-modified copper nanoparticles, oil-soluble copper-tin alloy nanoparticles, oil-soluble copper-nickel alloy nanoparticles, oil-soluble copper-manganese-nickel alloy nanoparticles, oil-soluble copper-silver-nickel alloy nanoparticles, oil-soluble copper-iron-molybdenum alloy nanoparticles, oil-soluble copper-tungsten alloy nanoparticles. In the present application, the particle size of the oil-soluble nanoparticles is preferably 1-50 nm, further preferably 1-20 nm, more preferably 3-8 nm.

[0053] The present application also provides a preparation method of the lubricating oil system described in the above technical solutions, comprising the following steps:

[0054] The base oil and the oil-soluble copper-based nanoparticle are mixed and dispersed to obtain the lubricating oil system.

[0055] In the present application, the dispersion method is preferably ultrasonic, and the ultrasonic time is preferably 10-30 min, further preferably 10-20 min, and more preferably 15-20 min.

[0056] The present application also provides the use of the lubricating oil system in the construction of an oil-based super-slippery system.

[0057] The present application also provides an oil-based super-slippery system, comprising the lubricating oil system and a polymer-metal pair.

[0058] The oil-based super-slippery system provided by the present application comprises the lubricating oil system.

[0059] The oil-based super-slippery system provided by the present application comprises a polymer-metal pair. In the present application, the material of the polymer friction pair in the polymer-metal pair preferably comprises a thermosetting resin material and / or a thermoplastic resin material.

[0060] In the present application, the thermosetting resin material preferably comprises a thermosetting resin and / or a modified thermosetting resin. In the present application, the thermosetting resin is preferably one or more of an epoxy resin, nylon 6, and a phenolic resin. In the present application, the modified thermosetting resin is preferably one or more of a blending modified thermosetting resin, a filling modified thermosetting resin, a fiber-reinforced modified thermosetting resin, a chemical modified thermosetting resin, and a surface modified thermosetting resin. In the present application, the blending modified thermosetting resin is preferably prepared by blending two or more of an epoxy resin, nylon 6, and a phenolic resin. In the present application, the filler in the filling modified thermosetting resin preferably comprises one or more of graphite sheets, polytetrafluoroethylene, hexagonal boron nitride, graphite carbon nitride, graphene, graphene derivatives, silicon dioxide, carbon fibers, glass fibers, carbon nanotubes, metal nanowires, and metal oxide nanowires; the carbon fibers preferably comprise chopped carbon fibers. In the present application, the filler in the fiber-reinforced modified thermosetting resin preferably comprises one or more of carbon fibers, glass fibers, carbon nanotubes, metal nanowires, and metal oxide nanowires; the carbon fibers preferably comprise chopped carbon fibers.

[0061] In the present application, the thermoplastic resin material preferably comprises a thermoplastic resin and / or a modified thermoplastic resin. In the present application, the thermoplastic resin is preferably one or more of polyether ether ketone, polyoxymethylene, polytetrafluoroethylene, and ultra-high molecular weight polyethylene. In the present application, the modified thermoplastic resin is preferably one or more of a blend modified thermoplastic resin, a filled modified thermoplastic resin, a fiber-reinforced modified thermoplastic resin, a chemically modified thermoplastic resin, and a surface modified thermoplastic resin. In the present application, the blend modified thermoplastic resin is preferably prepared by blending two or more of polyether ether ketone, polyoxymethylene, polytetrafluoroethylene, and ultra-high molecular weight polyethylene. In the present application, the filler in the filled modified thermoplastic resin preferably comprises one or more of graphite sheet, polytetrafluoroethylene, hexagonal boron nitride, graphite carbon nitride, graphene, graphene derivative, silicon dioxide, carbon fiber, glass fiber, carbon nanotube, metal nanowire, and metal oxide nanowire; the carbon fiber preferably comprises chopped carbon fiber. In the present application, the filler in the fiber-reinforced modified thermoplastic resin preferably comprises one or more of carbon fiber, glass fiber, carbon nanotube, metal nanowire, and metal oxide nanowire; the carbon fiber preferably comprises chopped carbon fiber.

[0062] In the present application, the surface roughness of the polymer friction pair in the polymer-metal pair is preferably 10-500 nm, further preferably 10-200 nm, and more preferably 100-200 nm. In the present application, the material of the metal friction pair in the polymer-metal pair is preferably a ferrous metal; the ferrous metal is preferably bearing steel and / or stainless steel; the bearing steel preferably comprises bearing steel GCr6, bearing steel GCr9, bearing steel GCr15, or bearing steel GCr95SiMn; the stainless steel preferably comprises stainless steel 316, stainless steel 316L, or stainless steel 304. In the present application, the surface roughness of the metal friction pair in the polymer-metal pair is preferably 10-500 nm, further preferably 10-200 nm, and more preferably 100-200 nm.

[0063] In the present application, the friction coefficient of the oil-based super-slippery system is preferably carried out on a MRH-3 high-speed ring-block friction and wear tester; the upper sample of the MRH-3 high-speed ring-block friction and wear tester is a block-shaped polymer material with a size of 25 mm x 10 mm x 9.85 mm, and the 25 mm x 10 mm surface is in contact with the metal counterpart; the lower sample is a circular ring-shaped metal counterpart, the outer diameter of which is 50 mm, the inner diameter is 40 mm, and the width is 27 mm. The test load is applied vertically through the center line of the rotating spindle, and the test is carried out in a linear contact mode, and the test is carried out at room temperature. During the test, the friction coefficient is automatically recorded by the computer; the average friction coefficient is obtained according to the specific friction curve change by the following two methods: (1) when the friction curve has reached a steady state, the average friction coefficient is the average value after reaching the steady state; (2) if the friction curve does not reach a steady state within the test time, the average friction coefficient is the real-time friction coefficient before the test ends. During the friction process, a LSP01-1A micro-injection pump is used to add the lubricating oil system to the friction contact interface at a speed of 10 mL / h. The wear volume of the polymer material is measured by using a Bruker Contour GT-K white light interference three-dimensional topography profiler, and the wear rate is calculated by the formula Ws = V / FL, wherein Ws (mm 3 / Nm) is the wear rate, V is the wear volume (mm 3 ), F is the load (N) used during the test, and L is the sliding distance (m).

[0064] The lubricating oil system, the preparation method and application thereof, and the oil-based super-slippery system provided by the present application will be described in detail below in combination with examples, but they should not be understood as limiting the scope of protection of the present application.

[0065] Example 1

[0066] The lubricating oil system is a PAO40 lubricating base oil containing 0.25 wt.% of oil-soluble surface-modified nano-copper particles (average particle size 3 nm).

[0067] Pure PAO40 lubricating base oil is used as a comparison.

[0068] The tribological properties of the system were tested using a high-speed ring-block friction and wear tester (MRH-3) with bearing steel GCr15 (surface roughness of 150nm) and polyetheretherketone (PEEK, surface roughness of 100nm) as the friction pair. The test load was 400N and the friction duration was 180min. The test was carried out in sequence with dry friction, pure PAO40 base oil lubrication and PAO40 base oil lubrication containing 0.25wt.% oil-soluble surface-modified nano-copper particles, and the friction durations were 30min, 30min and 120min respectively. During the entire friction process, the curve of the change of friction coefficient with friction time is shown in Figure 2. Figure 1 As shown. Figure 1 It can be seen that: during dry friction, the friction coefficient increases significantly with time; when lubricated with pure PAO40 base oil, the friction coefficient decreases significantly, but the friction coefficient still gradually increases with time; and when PAO40 base oil containing 0.25wt.% oil-soluble surface-modified nano-copper particles is added to the system, the system quickly enters a super-lubricating state. Although there are slight fluctuations, it remains in a super-lubricating state until the end of the test.

[0069] The preparation method of oil-soluble surface-modified nano-copper particles is as follows:

[0070] Dissolve 0.03 mol of copper sulfate pentahydrate in 100 mL of distilled water, add 15 mL of 25% ammonia water, 0.075 mol of formaldehyde, 0.03 mol of (O,O , )-di-n-octyl dithiophosphoric acid, 0.005 mol of di(2-ethyl-hexyl)phosphoric acid, and 100 mL of xylene were mixed evenly and slowly added dropwise to the prepared copper sulfate solution until bubbles were released. The mixture was stirred and reacted for 30 minutes. After standing for 60 minutes, the liquid was separated, and the upper layer was an oily liquid and the lower layer was a colorless, transparent aqueous phase. The lower aqueous phase was discarded, and the upper oil phase was distilled to obtain a viscous liquid, which was the oil-soluble surface-modified nano-copper particles.

[0071] Example 2

[0072] The lubricating oil system is a PAO40 lubricating base oil containing 0.05 wt.% of oil-soluble surface-modified nano-copper particles (average particle size 3 nm).

[0073] The tribological properties of the system were tested using a high-speed ring-block friction and wear tester (MRH-3) with bearing steel GCr15 (surface roughness of 150nm) and PEEK (surface roughness of 100nm) as the friction pair. The wear volume of PEEK was measured using a white light interferometric three-dimensional profiler (Bruker Contour GT-K). The test load was 400N, the friction duration was 120min, and the lubricant was PAO40 lubricating base oil containing 0.05wt.% oil-soluble surface-modified nano-copper particles. The curve of the change of friction coefficient with friction time during the entire friction process and the three-dimensional morphology of the wear scar on PEEK are shown in Figure 2. Figure 2 As shown. Figure 2 From a, we can see that during the entire test, the friction coefficient of the system was less than 0.01, which means that the entire system was always in a super-lubricated state. In other words, the system achieved oil-based super-lubricity without going through a friction running-in phase, which is a full-time oil-based super-lubricity state. However, due to the relatively low amount of Cu nano-additive, the friction film on the friction interface formed slowly, so the friction curve had a slight fluctuation. Figure 2 From b, we can see that the wear of PEEK material is very small (almost unrecognizable), and the wear rate is 10 -9 mm 3 / Nm level; the average friction coefficient of the system is 0.0059, and the wear rate is 6.3×10 -9 mm 3 / Nm (see Table 1).

[0074] The preparation method of the oil-soluble surface-modified nano-copper particles is the same as that in Example 1.

[0075] Example 3

[0076] The lubricating oil system is a PAO40 lubricating base oil containing 2.5 wt.% of oil-soluble surface-modified nano-copper particles (average particle size 3 nm).

[0077] The tribological properties of the system were tested using a high-speed ring-block friction and wear tester (MRH-3) with bearing steel GCr15 (surface roughness of 150nm) and PEEK (surface roughness of 100nm) as the friction pair. The wear volume of PEEK was measured using a white light interferometric three-dimensional profiler (Bruker Contour GT-K). The test load was 400N, the friction duration was 120min, and the lubricant was PAO40 lubricating base oil containing 2.5wt.% oil-soluble surface-modified nano-copper particles. The curve of the change of friction coefficient with friction time during the entire friction process and the three-dimensional morphology of the wear scar on PEEK are shown in Figure 2. Figure 3 As shown. Figure 3From a, we can see that during the entire test, the friction coefficient of the system is less than 0.01, that is, the entire system is always in a super-lubricated state. In other words, the system achieves oil-based super-lubricity without going through a friction running-in phase, that is, it is a full-time oil-based super-lubricity state. Only in the initial stage, the friction coefficient gradually increases with time. When the friction lasts for 2500s, the friction coefficient reaches a stable state and remains at around 0.0058 until the end of the test. Figure 3 From b, we can see that the wear of PEEK material is very small (almost unrecognizable), and the average wear rate is 7.6×10 -9 mm 3 / Nm (see Table 1).

[0078] The preparation method of the oil-soluble surface-modified nano-copper particles is the same as that in Example 1.

[0079] Example 4

[0080] The lubricating oil system is a PAO40 lubricating base oil containing 0.25 wt.% of oil-soluble surface-modified nano-copper particles (average particle size 3 nm).

[0081] The tribological properties of the system were tested using a high-speed ring-block friction and wear tester (MRH-3) with bearing steel GCr15 (surface roughness of 150nm) and PEEK (surface roughness of 100nm) as the friction pair. The wear volume of PEEK was measured using a white light interferometric three-dimensional profiler (Bruker Contour GT-K). The test load was 900N, the friction duration was 120min, and the lubricant was PAO40 lubricating base oil containing 0.25wt.% oil-soluble surface-modified nano-copper particles. The curve of the change of friction coefficient with friction time during the entire friction process and the three-dimensional morphology of the wear scar on PEEK are shown in Figure 2. Figure 4 As shown. Figure 4 From a, we can see that during the entire test, the friction coefficient of the system is less than 0.01, that is, the entire system is always in a super-lubricated state. That is to say, the system achieves oil-based super-lubricating without going through the friction running-in stage, that is, it is a full-process oil-based super-lubricating state. Only in the initial stage, the friction coefficient gradually decreases with time. When the friction lasts for 1800s, the friction coefficient reaches a stable state of about 0.0062 until the end of the test. Figure 4 As can be seen from b, although the wear of PEEK material is slightly greater than that in Example 2 and Example 3 (mainly due to the larger load), the wear rate is still small, with an average value of 1.5×10 -8 mm 3 / Nm.

[0082] The preparation method of the oil-soluble surface-modified nano-copper particles is the same as that in Example 1.

[0083] Example 5

[0084] The lubricating oil system was PAO40 lubricating base oil containing 1.0 wt.% of oil-soluble surface-modified nano-copper particles (average particle size 3 nm).

[0085] The tribological properties of the system were tested using a high-speed ring-block friction and wear tester (MRH-3 type) with bearing steel GCr15 (surface roughness 150 nm) and short carbon fiber (SCF) reinforced modified PEEK with a volume content of 20% (PEEK / 20SCF, surface roughness 150 nm) as the friction pair. The wear volume of PEEK / 20SCF was measured using a white light interferometric three-dimensional topography profiler (Bruker Contour GT-K type). The test load was 400 N, the friction duration was 120 min, and the lubricant was PAO40 lubricating base oil containing 1.0 wt.% of oil-soluble surface-modified nano-copper particles. The curve of the friction coefficient versus the friction time during the entire friction process is shown in Figure 5 Figure 5 It can be seen that the friction system was in a super-slip state all the time, and the friction coefficient was maintained at about 0.005 after a running-in stage of 3600 s, until the end of the test. The average friction coefficient of the system was 0.0051, and the wear rate was 4.8 x 10 -8 mm 3 / Nm (see Table 1).

[0086] The preparation method of the oil-soluble surface-modified nano-copper particles was the same as in Example 1.

[0087] Example 6

[0088] The lubricating oil system was PAO40 lubricating base oil containing 2.5 wt.% of oil-soluble surface-modified nano-copper particles (average particle size 3 nm).

[0089] The tribological properties of the system were tested using a high-speed ring-block friction and wear tester (MRH-3 type) with bearing steel GCr15 (surface roughness 150 nm) and short carbon fiber (SCF) reinforced modified PEEK with a volume content of 20% (PEEK / 20SCF, surface roughness 150 nm) as the friction pair. The wear volume of PEEK / 20SCF was measured using a white light interferometric three-dimensional topography profiler (Bruker Contour GT-K type). The test load was 400 N, the friction duration was 120 min, and the lubricant was PAO40 lubricating base oil containing 1.0 wt.% of oil-soluble surface-modified nano-copper particles (average particle size 3 nm). The curve of the friction coefficient versus the friction time during the entire friction process is shown in Figure 6 Figure 6 ​​It can be seen that the friction system is always in the super-slip state, and the friction coefficient is maintained at about 0.006 after only 600 s of running-in stage, until the end of the test. The average friction coefficient of the system is 0.0062, and the wear rate is 5.5 x 10 -8 mm 3 / Nm (see Table 1).

[0090] The preparation method of the oil-soluble surface-modified copper nanoparticles is the same as that in Example 1.

[0091] Example 7

[0092] The lubricating oil system is an ester oil (DIOS) lubricating base oil containing 0.05 wt.% of oil-soluble copper-nickel alloy nanoparticles (average particle size 5 nm).

[0093] The tribological properties of the system were tested by using a high-speed ring-block friction and wear tester (MRH-3 type) with stainless steel 316L (surface roughness 100 nm) and epoxy resin (EP, surface roughness 100 nm) as the friction pair. The wear volume of the EP was measured by using a white light interferometric three-dimensional topography profiler (Bruker Contour GT-K type). The test load was 600 N, the friction duration was 120 min, and the lubricant was DIOS lubricating base oil containing 0.05 wt.% of oil-soluble copper-nickel alloy nanoparticles. The average friction coefficient of the system was 0.0072, and the wear rate was 6.7 x 10 -9 mm 3 / Nm (see Table 1).

[0094] The preparation method of the oil-soluble copper-nickel alloy nanoparticles is as follows:

[0095] 0.021 mol of copper nitrate (Cu(NO3)2·6H2O) and 0.0002 mol of nickel acetate were dissolved in 100 mL of distilled water; 18 mL of ammonia water with a concentration of 25%, 0.1 mol of hydrazine hydrate, 0.01 mol of 2-hydroxy-5-nonyl-methyl ketone oxime, 0.01 mol of di(2-ethyl-hexyl) phosphoric acid, and 100 mL of petroleum ether were mixed uniformly, and then slowly added to the prepared metal salt solution, with gas bubbles being released. After stirring for 15 min, the system was allowed to stand, and the upper layer was the oil phase liquid, and the lower layer was the colorless transparent water phase liquid, which was discarded. The upper layer oil phase was distilled to obtain a viscous liquid, which was the oil-soluble copper-nickel alloy nanoparticles with a particle size of about 5 nm.

[0096] Example 8

[0097] The lubricating oil system is AN-5 lubricating base oil containing 2.5 wt.% of oil-soluble copper-iron-molybdenum alloy nanoparticles (average particle size 8 nm).

[0098] The tribological properties of the system were tested by using a high-speed ring-block friction and wear tester (MRH-3 type) with stainless steel 304 (surface roughness 200 nm) and phenolic resin (PF, surface roughness 100 nm) as the friction pair; the wear volume of PF was measured by using a white light interferometric three-dimensional topography profiler (Bruker Contour GT-K type). The test load was 800 N, the friction duration was 120 min, and the lubricant was AN-5 lubricating base oil containing 2.5 wt.% of oil-soluble copper-iron-molybdenum alloy nanoparticles. The average friction coefficient of the system was 0.0084, and the wear rate was 8.9 x 10 -9 mm 3 / Nm (see Table 1).

[0099] The preparation method of the oil-soluble copper-iron-molybdenum alloy nanoparticles is as follows:

[0100] 0.006 mol of copper sulfate pentahydrate, 0.0001 mol of iron sulfate, and 0.0002 mol of ammonium molybdate were dissolved in 100 mL of distilled water; 4.60 mL of 25% ammonia water, 0.024 mol of hydrazine hydrate, and 0.022 mol of sodium hypophosphite, 0.006 mol of N,N'-bis(2-hydroxy-5-tocotinylbenzyl)-1,2-ethanediamine, and 150 mL of heptane were uniformly mixed, and the prepared metal salt solution was slowly added dropwise, with bubbles being discharged. After stirring for 180 min, the reaction was allowed to stand, and after 120 min, the upper layer was a colorless transparent aqueous phase liquid, and the lower layer was an oil phase transparent red liquid. The lower layer organic phase was collected, and a viscous liquid was obtained by distillation, which was the oil-soluble copper-iron-molybdenum alloy nanoparticles.

[0101] The average friction coefficient of the oil-based super-smooth system and the average wear rate of the polymer friction pair of Examples 1-8 are shown in Table 1.

[0102] Table 1 Average friction coefficient of oil-based super-smooth system and average wear rate of polymer friction pair of Examples

[0103] Example Average coefficient of friction Average wear rate (mm 3 / Nm) 1 - - 2 0.0059 6.3 x 10 -9 ]]> 3 0.0058 <![CDATA[7.6×10 -9 ]]> 4 0.0062 1.5 x 10 -8 ]]> 5 0.0051 4.8 x 10 -8 ]]> 6 0.0062 5.5 x 10 -8 ]]> 7 0.0072 6.7 x 10 -9 <!-- 8 -->]]> 8 0.0084 8.9 x 10 -9 ]]

[0104] The above only describes the preferred embodiments of the present application, and it should be noted that those of ordinary skill in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered within the protection scope of the present application.

Claims

1. An oil-based super-lubricating system, characterized in that: Including lubricating oil system and polymer-metal pairing; The lubricating oil system includes base oil and oil-soluble copper-based nanoparticles; The oil-soluble copper-based nanoparticles are oil-soluble surface-modified nano-copper particles, oil-soluble copper-tin alloy nanoparticles, oil-soluble copper-nickel alloy nanoparticles, oil-soluble copper-manganese-nickel alloy nanoparticles, oil-soluble copper-silver-nickel alloy nanoparticles, oil-soluble copper-iron-molybdenum alloy nanoparticles or oil-soluble copper-tungsten alloy nanoparticles; The mass content of the oil-soluble copper-based nanoparticles in the lubricating oil system is 0.01 to 5.0%; The base oil includes one or more of Group I base oil, Group II base oil, Group III base oil, Group IV base oil and Group V base oil; The material of the polymer friction pair in the polymer-metal pair includes a thermosetting resin material and / or a thermoplastic resin material; The thermosetting resin material includes thermosetting resin and / or modified thermosetting resin; The modified thermosetting resin is one or more of a blended modified thermosetting resin, a filled modified thermosetting resin, a fiber reinforced modified thermosetting resin, a chemically modified thermosetting resin and a surface modified thermosetting resin; The thermoplastic resin material includes thermoplastic resin and / or modified thermoplastic resin; The modified thermoplastic resin is one or more of a blended modified thermoplastic resin, a filled modified thermoplastic resin, a fiber reinforced modified thermoplastic resin, a chemically modified thermoplastic resin and a surface modified thermoplastic resin; The material of the metal friction pair in the polymer-metal pair is iron-based metal; The iron-based metal is bearing steel and / or stainless steel; The bearing steel includes bearing steel GCr6, bearing steel GCr9, bearing steel GCr15 or bearing steel GCr95SiMn; The stainless steel includes stainless steel 316, stainless steel 316L or stainless steel 304.

2. The oil-based super-lubricating system according to claim 1, characterized in that: The base oil includes Group IV base oil and / or Group V base oil.

3. The oil-based super-lubricating system according to claim 1, characterized in that: The oil-soluble copper-based nanoparticles include oil-soluble copper elemental nanoparticles and / or oil-soluble copper alloy nanoparticles.

4. The oil-based super-lubricating system according to claim 1, characterized in that: The preparation method of the lubricating oil system comprises the following steps: The base oil and the oil-soluble copper-based nanoparticles are mixed and dispersed to obtain the lubricating oil system.

5. The oil-based super-lubricating system according to claim 1, characterized in that: The surface roughness of the polymer friction pair in the polymer-metal pair is 10-500 nm.

6. The oil-based super-lubricating system according to claim 1, characterized in that: The surface roughness of the metal friction pair in the polymer-metal pair is 10-500 nm.

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