A kind of wheel belt lubricating oil and its preparation method and application

Abstract

The present invention provides a wheel band lubricant and a preparation method and application thereof, belonging to the technical field of wheel band lubrication. The wheel band lubricant in the present invention comprises 48.5-88.7% of oil-soluble polyether, 5.0-15.0% of functionalized ethylene-propylene copolymer, 1.0-5.0% of hydrogenated styrene diene copolymer, 5.0-30.0% of colloidal nanographite, and 0.3-1.5% of oil-soluble nano copper particles. The present invention adopts oil-soluble polyether as base oil, which can volatilize rapidly at high temperature, does not generate sediment and colloid, can avoid smoke phenomenon and reduce particle wear; adopts functionalized ethylene-propylene copolymer and hydrogenated styrene diene copolymer as adhesive, the two have good positive synergistic effect, increase the internal friction between wheel band lubricant molecules, can greatly improve the solubility and dispersion uniformity of colloidal nano graphite and oil-soluble nano copper particles in base oil, and avoid agglomeration and agglomeration after long-term placement.

Description

Technical Field

[0001] The invention relates to the technical field of wheel belt lubrication, and in particular to a wheel belt lubricating oil and a preparation method and application thereof. Background Art

[0002] The rotary kiln is the core equipment of cement production enterprises. It is subjected to huge mechanical force, thermal deformation and chemical erosion during high temperature and heavy load operation. The wheel belt is the most important supporting component of the rotary kiln. It has heavy load, large torque, many fulcrums and complex operation system, which plays a very critical role in the stable operation of the rotary kiln.

[0003] Due to the difference in thermal expansion rate and rigidity between the kiln body and the wheel band, the inner diameter of the wheel band needs to be designed to be larger than the outer diameter of the kiln body (including the pad), so that the kiln body (pad) and the wheel band will have a certain misalignment during operation, which is called rolling displacement. The range of normal rolling displacement misalignment is limited to the diameter difference between the kiln body (including the pad) and the wheel band, and occurs at a certain ratio. If the lubrication between the wheel band and the kiln body (including the pad) is improper or not lubricated, abnormal rolling displacement will occur, and the contact surface will bite or slip. These phenomena will cause abnormal friction between the pad and the wheel band, and the kiln body will shake when rotating, inducing the breakage and shedding of the refractory bricks in the kiln body, resulting in unexpected kiln shutdown for maintenance and additional production losses. Therefore, the lubrication between the wheel band and the pad is very important. The wheel tyres of rotary kilns usually work continuously at a high temperature of 270 to 370°C and a load of tens of tons. The working conditions are very harsh. Previously, cement plants have been using gear oil or hydraulic oil, but deposits and colloids will quickly form at high temperatures, increasing component wear and causing serious smoke and environmental pollution. Therefore, it is difficult to meet lubrication and environmental protection requirements.

[0004] In recent years, special lubricants for wheel tyres have been developed. The lubricants use synthetic base oils, which can volatilize and decompose at high temperatures, reducing pollution to the environment. Solid additives are introduced, so that the base oil can continue to work at high temperatures after it fails. At present, domestic and foreign researchers have reported on related research on wheel tyre lubricants, but there are still some shortcomings. For example, Chinese patent CN 201110431023.4 discloses a rotary kiln wheel tyre lubricating oil and a manufacturing method thereof, which uses poly-α-olefin synthetic oil, composite calcium sulfonate grease, composite metal soap, nano-colloidal molybdenum disulfide powder, colloidal graphite powder, nano-soft metal powder and flame retardant as raw materials, solves the problem of poor lubrication of rotary kiln wheel tyres in harsh environments, and has good anti-wear and high temperature resistance. However, the rotary kiln wheel tyre lubricating oil contains composite calcium sulfonate grease and composite metal soap, and there is a serious smoke problem when used under high temperature conditions, which causes serious pollution. Moreover, after the light component base oil evaporates, soap substances such as thickeners contained in the composite calcium sulfonate grease dry and remain on the wheel tyre, which increases wear. At the same time, the rotary kiln wheel tyre lubricating oil has poor adhesion and there is an oil throwing problem during use. The document "Development of Special Lubricating Oil for Cement Rotary Kiln Wheels" (2021, 6: 8-12) reports a method for preparing wheel lubricating oil, using polyol esters and complex esters as base oils, graphite and molybdenum disulfide as solid additives, and dispersants to disperse the solid additives to prevent sedimentation. However, due to the high content of solid additives in the wheel lubricating oil, the effect of the dispersant will be very limited, so it is still difficult to avoid the sedimentation, agglomeration and agglomeration problems of solid additives after long-term storage. Moreover, although the selected dispersants, polyol esters and complex esters produce less smoke when the operating temperature is below 300°C for the 5000t production line in the cement plant, they still cannot meet the high-temperature lubrication requirements of 350°C for the production line above 8000t.

[0005] Chinese patent CN202210269888.3 discloses a wheel lubricant and its preparation method and application, which uses synthetic polyol ester base oil to compound polyol high-viscosity composite ester, and uses a mixture of ultrafine graphite powder and ultrafine molybdenum disulfide powder as a solid additive. Although the wheel lubricant is used in a 5000t production line of a cement plant and produces less smoke when working under conditions below 300°C, it can meet the lubrication requirements, but it is easy to agglomerate when stored for more than 6 months, which will cause the sedimentation problem of solid additives. Summary of the invention

[0006] The purpose of the present invention is to provide a wheel belt lubricating oil and a preparation method and application thereof. The wheel belt lubricating oil provided by the present invention has excellent storage stability, high temperature resistance and environmental protection, and has good extreme pressure and anti-wear properties.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] The present invention provides a wheel belt lubricating oil, comprising the following components in percentage by mass:

[0009] 48.5-88.7% of oil-soluble polyether, 5.0-15.0% of functionalized ethylene-propylene copolymer, 1.0-5.0% of hydrogenated styrene-diene copolymer, 5.0-30.0% of colloidal nano-graphite, and 0.3-1.5% of oil-soluble nano-copper particles.

[0010] Preferably, the kinematic viscosity of the oil-soluble polyether at 40°C is 15 to 250 mm 2 / s.

[0011] Preferably, the raw materials for preparing the oil-soluble polyether include a first monomer and a first initiator, the first monomer includes butylene oxide and propylene oxide, and the first initiator is an alcohol compound.

[0012] Preferably, the functionalized ethylene-propylene copolymer is obtained by reacting an olefin copolymer with a functionalized component, and the functionalized component includes one or more of amines, amides, nitrogen-containing heterocyclic compounds and alcohols.

[0013] Preferably, the hydrogenated styrene diene copolymer is a star polymer with a relative molecular mass of 50,000 to 100,000.

[0014] Preferably, the raw materials for preparing the hydrogenated styrene diene copolymer include a second monomer and a second initiator; the second monomer includes styrene and butadiene, or the second monomer includes styrene and isoprene; and the second initiator is sec-butyl lithium.

[0015] Preferably, the colloidal nanographite is obtained by dispersing graphite particles in an organic solvent; the particle size of the graphite particles is ≤2 μm; and the content of graphite particles in the colloidal nanographite is 3-25 wt%.

[0016] Preferably, the oil-soluble nano-copper particles are nano-copper particles whose surfaces are modified with diisooctyl dithiophosphoric acid; and the particle size of the nano-copper particles is 2 to 30 nm.

[0017] The present invention provides a method for preparing the wheel belt lubricating oil described in the above technical solution, comprising the following steps:

[0018] The oil-soluble polyether, the functionalized ethylene-propylene copolymer, the hydrogenated styrene-diene copolymer, the colloidal nano-graphite and the oil-soluble nano-copper particles are mixed to obtain the wheel belt lubricating oil.

[0019] The present invention provides application of the wheel belt lubricating oil described in the above technical solution or the wheel belt lubricating oil prepared by the preparation method described in the above technical solution in lubricating the wheel belt of a rotary kiln.

[0020] The present invention provides a wheel belt lubricating oil, comprising the following components in percentage by weight: 48.5-88.7% of oil-soluble polyether, 5.0-15.0% of functionalized ethylene-propylene copolymer, 1.0-5.0% of hydrogenated styrene diene copolymer, 5.0-30.0% of colloidal nanographite, and 0.3-1.5% of oil-soluble nano copper particles. The present invention adopts oil-soluble polyether (OSP) as base oil. Compared with mineral oil and other synthetic oils, polyether is easy to break chain under the action of high-temperature thermal oxidation to generate low-molecular carbonyl compounds, and the viscosity gradually decreases without increasing. It will volatilize rapidly under high temperature conditions, so polyether will not generate sediment and colloid substances under high temperature conditions, thereby avoiding smoke and reducing particle wear; in addition, because the oil-soluble polyether itself has excellent viscosity-temperature performance and low-temperature performance, the wheel belt lubricating oil can still be smoothly sprayed and used under low temperature conditions, and is not prone to clogging. The present invention uses functionalized ethylene propylene copolymer and hydrogenated styrene diene copolymer as adhesives, which have good positive synergistic effect, increase the internal friction between wheel belt lubricating oil molecules, and can greatly improve the solubility and dispersion uniformity of colloidal nanographite and oil-soluble nano copper particles in base oil, avoiding agglomeration and caking after long-term placement. The present invention introduces colloidal nanographite and oil-soluble nano copper particles as solid additives, and the organically modified nano graphite particles and nano copper particles have better solubility in the base oil, and can be evenly dispersed in the system, and will not agglomerate and settle after long-term placement. After the base oil and organic molecules are decomposed and volatilized under high temperature conditions above 350°C in a rotary kiln, the solid additive can play a good lubricating role. The present invention controls the types and proportions of the components, so that the wheel lubricating oil has excellent storage stability (no sedimentation after being placed for 12 months), high temperature resistance and environmental protection (no smoke is generated when used at a high temperature of 350°C), and has good extreme pressure and anti-wear properties, and can be used for the lubrication of rotary kiln wheel tyres, especially can meet the high temperature lubrication requirements of 350°C for rotary kiln wheel tyres of production lines above 8000t in cement plants. The wheel lubricating oil provided by the present invention has reasonable raw material compatibility, simple preparation method, convenient use, and wide application range. DETAILED DESCRIPTION

[0021] The present invention provides a wheel belt lubricating oil, comprising the following components in percentage by mass:

[0022] 48.5-88.7% of oil-soluble polyether, 5.0-15.0% of functionalized ethylene-propylene copolymer, 1.0-5.0% of hydrogenated styrene-diene copolymer, 5.0-30.0% of colloidal nano-graphite, and 0.3-1.5% of oil-soluble nano-copper particles.

[0023] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known to those skilled in the art or are prepared by methods well known to those skilled in the art.

[0024] In terms of mass percentage, the wheel belt lubricant of the present invention comprises 48.5-88.7% of oil-soluble polyether (OSP), preferably 60.0-80.0%, and more preferably 66.0-72.0%. In the present invention, the kinematic viscosity of the oil-soluble polyether at 40°C is preferably 15-250 mm 2 / s, more preferably 20 to 50 mm 2 / s, more preferably 29 to 35 mm 2 / s. In the present invention, the raw materials for preparing the oil-soluble polyether preferably include a first monomer and a first initiator; the first monomer preferably includes butylene oxide and propylene oxide, and the molar ratio of butylene oxide to propylene oxide is preferably 40-60:40-60; the first initiator is preferably an alcohol compound, more preferably n-butanol. In the present invention, the oil-soluble polyether is preferably a synthetic oil OSP32. In an embodiment of the present invention, the synthetic oil OSP32 was purchased from Nanjing Gutian Chemical Co., Ltd., and the kinematic viscosity at 40°C is 31.35 mm 2 / s. The present invention adopts oil-soluble polyether as base oil, which has excellent viscosity-temperature performance, low temperature performance, tribological performance and good additive solubility, and has a special high-temperature oxidation decomposition volatilization mechanism, so that the wheel belt lubricating oil is environmentally friendly and smoke-free under high temperature conditions, and can still be sprayed and used smoothly under low temperature conditions without clogging.

[0025] In terms of mass percentage, the wheel belt lubricant of the present invention comprises 5.0-15.0%, preferably 6.0-12.0%, and more preferably 8.0-10.0% of the functionalized ethylene-propylene copolymer. In the present invention, the functionalized ethylene-propylene copolymer is preferably obtained by reacting an olefin copolymer with a functionalized component, and the functionalized component preferably comprises one or more of amines, amides, nitrogen-containing heterocyclic compounds, and alcohols, and more preferably amides. In the present invention, the functionalized ethylene-propylene copolymer is preferably Hitec 5777 of Afton. The present invention uses the functionalized ethylene-propylene copolymer as an adhesive, which can well disperse the solid additives (colloidal nanographite and oil-soluble nano copper particles), which is beneficial to improving the storage stability of the wheel belt lubricant.

[0026] In terms of mass percentage, the wheel lubricant of the present invention includes 1.0-5.0% of hydrogenated styrene diene copolymer, preferably 1.5-3.5%, and more preferably 2.0-3.0%. In the present invention, the hydrogenated styrene diene copolymer is preferably a star polymer, and the relative molecular mass is preferably 50000-100000. In the present invention, the raw materials for preparing the hydrogenated styrene diene copolymer preferably include a second monomer and a second initiator; the second monomer preferably includes styrene and butadiene, or the second monomer preferably includes styrene and isoprene; the second initiator is preferably sec-butyl lithium; in the present invention, the hydrogenated styrene diene copolymer is preferably a hydrogenated styrene isoprene star copolymer, and the relative molecular mass is preferably 50000-100000. In the present invention, the hydrogenated styrene isoprene star copolymer is preferably SV260 of Shell. The present invention preferably uses hydrogenated styrene diene copolymer as an adhesive, which works synergistically with the functionalized ethylene propylene copolymer, which is beneficial to improving the internal friction of the wheel tyre lubricant, can better disperse the solid additives, further improve the storage stability of the wheel tyre lubricant, and is also beneficial to improving the adhesion performance of the wheel tyre lubricant, and will not cause oil throwing under the low-speed and heavy-load conditions of the rotary kiln.

[0027] According to the percentage by mass, the wheel lubricant of the present invention includes 5.0-30.0% colloidal nanographite, preferably 10.0-25.0%, and more preferably 15.0-20.0%. In the present invention, the colloidal nanographite is preferably obtained by dispersing graphite particles in an organic solvent; the particle size of the graphite particles is preferably ≤2μm; the content of graphite particles in the colloidal nanographite is preferably 3-25wt%, more preferably 10-20wt%, and further preferably 13-15wt%; the organic solvent is preferably a ketone organic solvent, and the boiling range of the organic solvent is preferably 70-150°C, and the melting point is preferably <-20°C. Specifically, the colloidal nanographite of the present invention is a black viscous suspension liquid. In the present invention, the colloidal nanographite is preferably purchased from Qingdao Huatai Lubrication and Sealing Technology Co., Ltd., model TS-O, the particle size of the graphite particles is ≤2μm, and the content is 15wt%. The present invention adopts colloidal nanographite as a solid additive, which can be well dispersed in the base oil (oil-soluble polyether) under the action of an adhesive (functionalized ethylene propylene copolymer and hydrogenated styrene diene copolymer), so that the wheel belt lubricating oil can exert excellent lubricating performance under high temperature conditions and has excellent storage stability.

[0028] In terms of mass percentage, the wheel belt lubricant of the present invention includes 0.3-1.5% of oil-soluble nano copper particles, preferably 0.5-1.0%. In the present invention, the oil-soluble nano copper particles are preferably nano copper particles modified with diisooctyl dithiophosphoric acid on the surface, and the particle size of the nano copper particles is preferably 2-30nm. The present invention does not specifically limit the source of the oil-soluble nano copper particles, and can be prepared by methods well known to those skilled in the art (patent CN201910999944.7 A kind of oil-soluble nano copper and its preparation method). The present invention preferably uses oil-soluble nano copper particles as solid additives, which can be well dispersed in the base oil under the action of an adhesive, improve storage stability, and have a good synergistic effect with colloidal nano graphite, which can further improve the lubrication performance of the wheel belt lubricant.

[0029] The present invention provides a method for preparing the wheel belt lubricating oil described in the above technical solution, comprising the following steps:

[0030] The oil-soluble polyether, the functionalized ethylene-propylene copolymer, the hydrogenated styrene-diene copolymer, the colloidal nano-graphite and the oil-soluble nano-copper particles are mixed to obtain the wheel belt lubricating oil.

[0031] In the present invention, the mixing preferably includes: a first stirring and mixing of the soluble polyether, the functionalized ethylene propylene copolymer and the hydrogenated styrene diene copolymer, and then a second stirring and mixing of the obtained mixture with the colloidal nanographite and the oil-soluble nano copper particles. In the present invention, the temperature of the first stirring and mixing is preferably 55-85°C, more preferably 60-80°C; the time is preferably 2-5h. In the present invention, the temperature of the second stirring and mixing is preferably 55-85°C, more preferably 60-80°C; the time is preferably 2-5h. In the present invention, the total time for adding the colloidal nanographite and the oil-soluble nano copper particles is preferably 2-3h, and the colloidal nano graphite and the oil-soluble nano copper particles are each preferably added in batches, and the number of additions is preferably 5 or more. The present invention has no special restrictions on the stirring rates of the first stirring and mixing and the second stirring and mixing, and the stirring rates well known to those skilled in the art can be used. The present invention has no special restrictions on the container used for the first stirring and mixing, and the stirring container well known to those skilled in the art can be used. In the present invention, the container for the second stirring and mixing is preferably a colloid mill. In the present invention, the first stirring and mixing is preferably carried out under the above temperature conditions, so that the oil-soluble polyether can be fully mixed with the functionalized ethylene-propylene copolymer and the hydrogenated styrene-diene copolymer. In the present invention, the second stirring and mixing is preferably carried out under the above temperature conditions and in the above colloid mill, so that the solid additive can be evenly dispersed in the mixed system formed by the base oil and the adhesive.

[0032] The present invention provides the use of the wheel lubricating oil described in the above technical solution or the wheel lubricating oil prepared by the preparation method described in the above technical solution in the lubrication of the wheel of a rotary kiln. The present invention has no special limitation on the type of the rotary kiln, which can be a rotary kiln in the cement mining industry or a rotary kiln in the chemical industry.

[0033] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Some of the raw materials involved in the following examples and comparative examples include:

[0035] Oil-soluble polyether (OSP) synthetic oil OSP32 was purchased from Nanjing Gutian Chemical Co., Ltd., with a kinematic viscosity of 31.35 mm at 40 °C. 2 / s;

[0036] The functionalized ethylene-propylene copolymer was Hitec 5777 from Afton;

[0037] The hydrogenated styrene isoprene star copolymer is SV260 from Shell;

[0038] The colloidal nanographite is TS-O from Qingdao Huatai Lubrication and Sealing Technology Co., Ltd. The particle size of the graphite particles is ≤2 μm and the content is 15 wt%.

[0039] The oil-soluble nano-copper particles were prepared according to the method of Example 1 in patent CN201910999944.7.

[0040] Example 1

[0041] Weigh 48.5g of oil-soluble polyether synthetic oil OSP32, heat to 70±5℃ and stir, then add 15.0g of functionalized ethylene propylene copolymer and 5.0g of hydrogenated styrene isoprene star copolymer, stir at 70±5℃ for 3h, add the mixture to a colloid mill, and then add 30.0g of colloidal nanographite (added in 5 times) and 1.5g of oil-soluble nano copper particles (added in 5 times) within 2h, stir at 70±5℃ for 3h, and cool to room temperature (25℃) to obtain wheel tyre lubricating oil.

[0042] Example 2

[0043] Weigh 66.0g of oil-soluble polyether synthetic oil OSP32, heat to 70±5℃ and stir, then add 10.0g of functionalized ethylene propylene copolymer and 3.0g of hydrogenated styrene isoprene star copolymer, stir at 70±5℃ for 3h, add the mixture to a colloid mill, and then add 20.0g of colloidal nanographite (added in 5 times) and 1.0g of oil-soluble nano copper particles (added in 5 times) within 2h, stir at 70±5℃ for 3h, and cool to room temperature (25℃) to obtain wheel tyre lubricating oil.

[0044] Example 3

[0045] Weigh 88.7g of oil-soluble polyether synthetic oil OSP32, heat to 70±5℃ and stir, then add 5.0g of functionalized ethylene propylene copolymer and 1.0g of hydrogenated styrene isoprene star copolymer, stir at 70±5℃ for 3h, add the mixture to a colloid mill, and then add 5.0g of colloidal nanographite (added in 5 times) and 0.3g of oil-soluble nano copper particles (added in 5 times) within 2h, stir at 70±5℃ for 3h, and cool to room temperature (25℃) to obtain wheel tyre lubricating oil.

[0046] Comparative Example 1

[0047] A wheel tyre lubricant was prepared according to Example 3, except that 5.0 g of the functionalised ethylene propylene copolymer and 1.0 g of the hydrogenated styrene isoprene star copolymer were replaced with 6.0 g of the functionalised ethylene propylene copolymer.

[0048] Comparative Example 2

[0049] The wheel lubricating oil was prepared according to Example 3, except that 5.0 g of colloidal nanographite and 0.3 g of oil-soluble nano-copper particles were replaced with 5.3 g of colloidal nanographite.

[0050] Test Case

[0051] The performance tests of the wheel tyre lubricating oils prepared in the examples and comparative examples are as follows:

[0052] 1. The sintering load P of the wheel lubricating oil is tested by the extreme pressure performance test method of lubricating oil (GB / T 3142). D The larger the value, the stronger the carrying capacity.

[0053] 2. A simulated smoke test is used to evaluate whether the wheel tyre lubricating oil generates smoke when in use. Specifically, a No. 10 steel sheet is kept in a muffle furnace at 350°C for 10 minutes, then taken out and immediately dripped 5 to 10 drops of the wheel tyre lubricating oil on the surface of the No. 10 steel sheet at room temperature to observe whether smoke is generated.

[0054] 3. The adhesion test method is used to test the adhesion performance of the wheel lubricant on the friction pair surface. Specifically, a 60mm×80mm No. 45 steel sheet is taken, 3.0g of wheel lubricant is weighed as the test oil, and evenly applied to the surface of the No. 45 steel sheet. Then, it is hung vertically at room temperature. After 48 hours, the amount of test oil remaining on the surface of the No. 45 steel sheet is weighed. The oil retention rate (the amount of test oil remaining after the test / the amount of test oil before the test) is used to judge the adhesion of the oil. The larger the value, the better the adhesion.

[0055] 4. A high temperature storage test method is used to test the high temperature storage stability of the wheel tyre lubricant. Specifically, 100.0 g of the wheel tyre lubricant is taken as the test oil, placed in a glass beaker, and placed in a 50°C oven for 15 days. Then, observe whether the test oil is stratified and whether there is precipitation at the bottom of the beaker.

[0056] 5. The room temperature storage stability of the wheel tyre lubricant is tested by a room temperature storage test method. Specifically, 100.0 g of the wheel tyre lubricant is taken as the test oil, placed in a glass beaker, and placed at room temperature for 12 months. Then, observe whether the test oil is stratified and whether there is precipitation at the bottom of the beaker.

[0057] The performance of the wheel belt lubricating oils prepared in the examples and comparative examples was tested, and the results are shown in Table 1.

[0058] Table 1 Performance test results of wheel belt lubricating oil prepared in the embodiment and comparative example

[0059]

[0060] As shown in Table 1, the wheel lubricant provided by the present invention has excellent storage stability (no sedimentation after being placed at room temperature for 12 months), high temperature resistance and environmental protection (no smoke will be generated when used at a high temperature of 350°C), and has good extreme pressure and anti-wear performance. At the same time, compared with Comparative Example 1, the wheel lubricant prepared in Example 3 has excellent adhesion and storage stability, indicating that the functionalized ethylene propylene copolymer and hydrogenated styrene diene copolymer used in the present invention can produce a good positive synergistic effect, which is beneficial to improving the adhesion and storage stability of the wheel lubricant and preventing the solid additive from settling and agglomerating due to long-term placement; compared with Comparative Example 2, the wheel lubricant prepared in Example 3 has excellent extreme pressure and anti-wear performance, indicating that the present invention uses colloidal nanographite and oil-soluble nano copper particles to produce a good synergistic effect, which is beneficial to improving the extreme pressure performance of the wheel lubricant.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A wheel belt lubricating oil, characterized in that: Includes the following components in percentage by mass: Oil-soluble polyether 48.5~88.7%, functionalized ethylene propylene copolymer 5.0~15.0%, hydrogenated styrene diene copolymer 1.0~5.0%, colloidal nanographite 5.0~30.0%, oil-soluble nano copper particles 0.3~1.5%; The kinematic viscosity of the oil-soluble polyether at 40°C is 15-250 mm 2 / s; The colloidal nanographite is obtained by dispersing graphite particles in an organic solvent; the particle size of the graphite particles is ≤2 μm; the content of graphite particles in the colloidal nanographite is 3-25wt%; The oil-soluble nano copper particles are nano copper particles whose surfaces are modified with diisooctyl dithiophosphoric acid; and the particle size of the nano copper particles is 2-30 nm.

2. The wheel belt lubricating oil according to claim 1, characterized in that: The raw materials for preparing the oil-soluble polyether include a first monomer and a first initiator, the first monomer includes butylene oxide and propylene oxide, and the first initiator is an alcohol compound.

3. The wheel belt lubricating oil according to claim 1, characterized in that: The functionalized ethylene-propylene copolymer is obtained by reacting an olefin copolymer with a functionalized component, and the functionalized component includes one or more of amines, amides, nitrogen-containing heterocyclic compounds and alcohols.

4. The wheel belt lubricant according to claim 1, characterized in that: The hydrogenated styrene diene copolymer is a star polymer with a relative molecular mass of 50,000-100,000.

5. The wheel belt lubricating oil according to claim 1 or 4, characterized in that: The raw materials for preparing the hydrogenated styrene diene copolymer include a second monomer and a second initiator; the second monomer includes styrene and butadiene, or the second monomer includes styrene and isoprene; the second initiator is sec-butyl lithium.

6. The method for preparing the wheel belt lubricating oil according to any one of claims 1 to 5, characterized in that: The following steps are involved: The oil-soluble polyether, the functionalized ethylene-propylene copolymer, the hydrogenated styrene-diene copolymer, the colloidal nano-graphite and the oil-soluble nano-copper particles are mixed to obtain the wheel belt lubricating oil.

7. Use of the wheel lubricating oil according to any one of claims 1 to 5 or the wheel lubricating oil prepared by the preparation method according to claim 6 in lubricating the wheel of a rotary kiln.

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