A composite lubricating oil containing Prussian blue microcube additive and preparation method thereof

Abstract

The present invention discloses a composite lubricating oil containing a Prussian blue microcube additive and a preparation method thereof. The composite lubricating oil of the present invention comprises a base lubricating oil and an additive, wherein the additive is a Prussian blue compound. The present invention aims to develop the application potential of Prussian blue compounds in the field of tribology, and use it as a lubricating additive to improve the tribological properties of the base lubricating oil. The present invention prepares a composite lubricating oil containing a Prussian blue microcube additive, and expands the application of Prussian blue compounds in the field of friction and lubrication.

Description

Technical Field

[0001] The invention belongs to the technical field of lubricants, and in particular relates to a composite lubricating oil containing a Prussian blue microcube additive and a preparation method thereof. Background Art

[0002] Prussian blue (PB), chemically known as ferric ferrocyanide or hexacyanoferrate (II) iron (III), is also known as Berlin blue, Chinese blue, Hualan, Paris blue, Gong blue, etc. As a blue pigment with excellent performance, it was originally widely used in paints, inks and crayons. It is the most commonly used pigment by artists and it is also the first coordination compound discovered by humans. Prussian blue has a cubic structure and is stable at room temperature and pressure, while Prussian blue compounds (PBAs) have the same stable overall framework structure as Prussian blue. In recent years, due to the excellent magnetic, electrochemical, biochemical, photoconversion and storage properties of Prussian blue and Prussian blue compounds, they have received extensive attention from the academic community and become a research hotspot. Their applications have been developed into batteries, catalysis, information technology, energy, gas storage, biomedicine and sensing, environmental purification and other fields.

[0003] At present, Prussian blue and Prussian blue compounds are most widely used in the field of electrochemistry. Because of their characteristics of high electrolyte diffusion, efficient ion transport and structural stability, they are gradually developed and applied as positive electrode materials for zinc ion batteries and sodium ion batteries. However, the present invention finds that there are relatively few studies on them as a lubricating additive in the field of tribology. The present invention believes that their excellent structural properties make Prussian blue and Prussian blue compounds have high research value. Summary of the invention

[0004] The purpose of the present invention is to provide a composite lubricating oil containing a Prussian blue microcube additive and a preparation method thereof. The present invention aims to develop the application potential of Prussian blue compounds in the field of tribology and use them as a lubricating additive to improve the tribological properties of base lubricating oils. The present invention creatively applies a technical solution of Prussian blue compounds to lubricating oils to prepare a composite lubricating oil containing a Prussian blue microcube additive, expands the application of Prussian blue compounds in the field of friction and lubrication, and effectively improves the tribological properties of base lubricating oils.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A first aspect of the present invention is to provide a composite lubricating oil, comprising a base lubricating oil and an additive, wherein the additive is a Prussian blue compound.

[0007] As a preferred embodiment,

[0008] The base lubricating oil contains 0.05wt%-1wt% of additives, such as 0.05wt%, 0.1wt%, 0.2wt% and 1wt%.

[0009] As a preferred embodiment,

[0010] The Prussian blue compound is selected from at least one of NaFe-PBA, CoFe-PBA, MnFe-PBA or NiFe-PBA.

[0011] As a preferred embodiment,

[0012] The particle morphology of the Prussian blue compound is a cubic structure.

[0013] As a preferred embodiment,

[0014] The particle size of the Prussian blue compound is 1 to 2 μm.

[0015] As a preferred embodiment,

[0016] The base lubricating oil is dimethyl silicone lubricating oil.

[0017] As a preferred embodiment,

[0018] The average friction coefficient of the composite lubricant is 0.170 to 0.174;

[0019] The wear volume of the composite lubricant is 0.00529-0.01393 mm 3 .

[0020] As a preferred embodiment,

[0021] The preparation method of the additive NaFePBA comprises the following steps:

[0022] Step 1, dissolving a metal ferrocyanide salt alone in deionized water to form a solution A; dissolving ferrous sulfate heptahydrate and trisodium citrate together in deionized water to form a solution B; immediately adding solution A to solution B to obtain a mixed solution, aging and standing to form a white precipitate;

[0023] Step 2, collecting the white precipitate obtained in step 1 by centrifugation, washing, and vacuum drying to obtain the microcubic powder lubricating additive.

[0024] As a more preferred embodiment,

[0025] In solution A, the metal ferrocyanide salt is selected from sodium ferrocyanide decahydrate; and / or,

[0026] In solution A, the molar volume ratio of metal ferrocyanide to water is 10 mmol to 50 mmol: 1 mL; and / or,

[0027] In solution B, the molar ratio of the metal ferrocyanide to ferrous sulfate heptahydrate is 1:2 to 1:4; and / or,

[0028] In solution B, the molar volume ratio of ferrous sulfate heptahydrate to water is 10 mmol to 50 mmol: 1 mL; and / or,

[0029] In solution B, the molar mass ratio of the metal ferrocyanide salt to trisodium citrate is 1 mmol:1-5 g.

[0030] As a more preferred embodiment,

[0031] In step 1, the aging temperature is room temperature, and the aging time is 6 to 7 hours; and / or,

[0032] In step 2, the centrifugal speed is 8000 r / min, the number of centrifugation is 5 times, and the centrifugal time each time is 5 minutes; and / or,

[0033] In step 2, the washing detergent is anhydrous ethanol, and the number of washings is 3 to 5 times; and / or,

[0034] In step 2, the vacuum drying temperature is 40 to 60° C., and the vacuum drying time is 8 to 10 hours.

[0035] In the above-mentioned preparation method of the present invention, the preparation method of the additive is a chelating agent-assisted co-precipitation method, and the chelating agent is trisodium citrate, which plays a role in controlling the morphology and particle size of the particles during the synthesis process; in addition, this method also provides an aging step to leave enough reaction time for the newly generated particles to allow them to grow fully to reach a certain particle size.

[0036] As a preferred embodiment,

[0037] The preparation method of the additive CoFe-PBA includes the following steps: first, prepare the following two solutions. Solution A: 1mmol CoCl2·6H2O and 2mmol C6H5Na3O7·2H2O are dispersed in 40ml deionized water, solution B: 0.5mmol K3[Fe(CN)6] is dispersed in 40mL deionized water. Subsequently, solutions A and B are fully mixed under magnetic stirring (stirring speed: 320rpm). After stirring for 2 hours, aging is continued for 22 hours, and a dark purple residue is found. It is collected by centrifugation, washed with anhydrous ethanol and deionized water for 2-3 times, and finally vacuum dried at 80°C for 6h to obtain a cobalt-based Prussian blue material.

[0038] As a preferred embodiment,

[0039] The preparation method of the additive MnFe-PBA comprises the following steps: dissolving 3 mmol of sodium ferrocyanide decahydrate (Na4Fe(CN)6·10H2O) and 0.24 mol of sodium chloride (NaCl) in a beaker containing 100 ml of deionized water, stirring them thoroughly to obtain a mixed solution, transferring the mixed solution to a flask with a capacity of 500 ml, and heating the solution to 50-90° C. in a water bath. Dissolving 6 mmol of manganese sulfate monohydrate (MnSO4·H2O) in 100 ml of deionized water, stirring them uniformly, and then adding them dropwise to the mixed solution of sodium ferrocyanide and sodium chloride using a peristaltic pump, with a dropwise addition speed of 1 ml·min. -1 After the addition is complete, the mixture is aged for 2 hours. During the aging process, the temperature and stirring speed (300 rpm) are kept constant. The white precipitate is fully centrifuged and washed, and vacuum dried at 110°C for 8 hours to obtain a manganese-based Prussian blue material.

[0040] As a preferred embodiment,

[0041] The preparation method of the additive NiFe-PBA comprises the following steps: for the synthesis method of NiFe-PBA, 10mmol NiCl2·6H2O (2.377g), 21.22mmol sodium citrate (5.475g) and 33.74mmol PVP (polyvinyl pyrrolidone, 3.750g) materials are mixed and dissolved in 250ml of pure water. Then, under magnetic stirring (320rpm), the mixed solution is mixed evenly with K3[Fe(CN)6] aqueous solution (2.50mmol K3[Fe(CN)6], 0.824g, dissolved in 250ml of pure water) until it is clear. Then, the mixture is allowed to stand at 30°C for 72 hours. The light blue precipitate is centrifuged, washed alternately with pure water and anhydrous ethanol for 2-3 times, and then dried at 60°C for 8 hours to obtain the target product.

[0042] The Prussian blue compounds described above are existing Prussian blue compounds; the preparation method of the Prussian blue compounds described above is an existing commonly used method. In addition, the present invention also provides an aging step to leave enough reaction time for the newly generated particles to fully grow and reach a certain particle size.

[0043] The second aspect of the present invention is to provide a method for preparing the lubricating oil according to the first aspect of the present invention, comprising the following steps:

[0044] The additive is uniformly dispersed in the base lubricating oil to obtain a composite lubricating oil containing a Prussian blue type microcube structure additive.

[0045] As a preferred embodiment,

[0046] The uniform dispersion method is ultrasonic dispersion.

[0047] As a preferred embodiment,

[0048] The total ultrasound time is 10 to 15 minutes, and the ultrasound power is 400 to 500w.

[0049] The advantages and beneficial effects of the present invention are:

[0050] The microcubic lubricating additive of the present invention can be directly mixed with the base lubricating oil without adding other unnecessary ingredients. Due to the stable cubic structure and excellent storage performance of the Prussian blue compound, it can be evenly and stably dispersed in the base lubricating oil. During the friction process, the lubricating oil inside it is continuously supplied to the friction interface, which has a continuous lubrication effect on the friction contact area, and can improve the lubrication performance and wear reduction performance of the base lubricating oil. For example, when the concentration of the (NaFe-PBA) microcubic lubricating additive reaches 1wt%, it also has a certain improvement effect on the wear resistance of the base lubricating oil, about 34%. The tribological properties of the composite lubricating oil containing the Prussian blue microcubic additive of the present invention are studied using a multifunctional friction and wear tester. The results show that the average friction coefficient of the composite lubricating oil containing the Prussian blue microcubic additive of the present invention is 0.170-0.174, and its wear reduction performance can be improved by about 11%. Therefore, the Prussian blue microcubic additive of the present invention has a good lubricating effect in the lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a scanning electron microscope photograph of the Prussian blue microcube additive prepared in Example 1 of the present invention;

[0052] Figure 2 This is a scanning electron microscope photograph of the Prussian blue microcube additive prepared in Example 1 of the present invention at a further magnified scanning magnification;

[0053] Figure 3 This is a friction coefficient curve of dimethyl silicone oil lubricant;

[0054] Figure 4 The friction coefficient curve of the composite lubricating oil containing the Prussian blue microcube additive prepared in step 3 of Example 1;

[0055] Figure 5 A bar graph of average friction coefficients of the composite lubricating oil containing a Prussian blue microcube additive prepared in step 3 of Examples 1-4 at different concentrations;

[0056] Figure 6This is a comparative bar graph of the wear volume of the composite lubricating oil containing the Prussian blue microcube additive prepared in step 3 of Example 4 and the dimethyl silicone oil lubricating oil under a load of 60N. DETAILED DESCRIPTION

[0057] The present invention is further described in detail below through the accompanying drawings and specific embodiments.

[0058] In a specific embodiment of the present invention, the lubricating oil used is dimethyl silicone oil lubricating oil (purchased from: Shanghai MacLean Biochemical Technology Co., Ltd.).

[0059] Test method:

[0060] The composite lubricating oil containing Prussian blue microcube additives in the above embodiments was subjected to tribology experiments using ball-disc linear reciprocating friction. The friction ball material was GCr15 bearing steel with a diameter of 6 mm, the friction disc material was tin bronze with a diameter of 24 mm, the friction frequency was 1 Hz, and the load was 60 N to obtain the friction coefficient curves and wear volumes of the lubricating oil at different concentrations.

[0061] Example 1

[0062] A method for preparing a composite lubricating oil containing a Prussian blue microcube additive comprises the following steps:

[0063] Step 1, at room temperature, 4 mmol of sodium ferrocyanide decahydrate is dissolved in 200 ml of deionized water to form solution A, 6 mmol of ferrous sulfate heptahydrate and 15 g of trisodium citrate are dissolved in 200 ml of deionized water to form solution B, solution A is immediately added to solution B to obtain a mixed solution, and the solution is aged and allowed to stand for 6 hours to form a white precipitate;

[0064] Step 2, collecting the precipitate obtained in step 1 by centrifugation, centrifuging at 8000 r / min for 5 times, each time for 5 minutes, washing once with distilled water, washing 4 times with anhydrous ethanol, placing the washed precipitate in a vacuum drying oven, and drying at 60° C. for 8 hours to obtain a Prussian blue microcubic lubricating additive (NaFe-PBA);

[0065] Step 3, using an ultrasonic cell crusher, uniformly disperse the Prussian blue microcubic lubricating additive obtained in step 2 in the dimethyl silicone base oil to obtain a composite lubricating oil containing the Prussian blue microcubic lubricating additive, wherein the mass of the Prussian blue microcubic lubricating additive is 5 mg, and the mass of the dimethyl silicone lubricating oil is 10 g.

[0066] Example 2

[0067] A method for preparing a composite lubricating oil containing a Prussian blue microcube additive comprises the following steps:

[0068] Step 1, at room temperature, 4 mmol of sodium ferrocyanide decahydrate is dissolved in 200 ml of deionized water to form solution A, 6 mmol of ferrous sulfate heptahydrate and 15 g of trisodium citrate are dissolved in 200 ml of deionized water to form solution B, solution A is immediately added to solution B to obtain a mixed solution, and the solution is aged and allowed to stand for 6 hours to form a white precipitate;

[0069] Step 2, collecting the precipitate obtained in step 1 by centrifugation, centrifuging at 8000 r / min for 5 times, each time for 5 minutes, washing once with distilled water, washing 4 times with anhydrous ethanol, placing the washed precipitate in a vacuum drying oven, and drying at 60° C. for 8 hours to obtain a Prussian blue microcubic lubricating additive (NaFe-PBA);

[0070] Step 3, using an ultrasonic cell crusher, uniformly disperse the Prussian blue microcubic lubricating additive obtained in step 2 in the dimethyl silicone base oil to obtain a composite lubricating oil containing the Prussian blue microcubic lubricating additive, wherein the mass of the Prussian blue microcubic lubricating additive is 10 mg, and the mass of the dimethyl silicone lubricating oil is 10 g.

[0071] Example 3

[0072] A method for preparing a composite lubricating oil containing a Prussian blue microcube additive comprises the following steps:

[0073] Step 1, at room temperature, 4 mmol of sodium ferrocyanide decahydrate is dissolved in 200 ml of deionized water to form solution A, 6 mmol of ferrous sulfate heptahydrate and 15 g of trisodium citrate are dissolved in 200 ml of deionized water to form solution B, solution A is immediately added to solution B to obtain a mixed solution, and the solution is aged and allowed to stand for 6 hours to form a white precipitate;

[0074] Step 2, collecting the precipitate obtained in step 1 by centrifugation, centrifuging at 8000 r / min for 5 times, each time for 5 minutes, washing once with distilled water, washing 4 times with anhydrous ethanol, placing the washed precipitate in a vacuum drying oven, and drying at 60° C. for 8 hours to obtain a Prussian blue microcubic lubricating additive (NaFe-PBA);

[0075] Step 3, using an ultrasonic cell crusher, uniformly disperse the Prussian blue microcubic lubricating additive obtained in step 2 in the dimethyl silicone base oil to obtain a composite lubricating oil containing the Prussian blue microcubic lubricating additive, wherein the mass of the Prussian blue microcubic lubricating additive is 20 mg, and the mass of the dimethyl silicone lubricating oil is 10 g.

[0076] Example 4

[0077] A method for preparing a composite lubricating oil containing a Prussian blue microcube additive comprises the following steps:

[0078] Step 1, at room temperature, 4 mmol of sodium ferrocyanide decahydrate is dissolved in 200 ml of deionized water to form solution A, 6 mmol of ferrous sulfate heptahydrate and 15 g of trisodium citrate are dissolved in 200 ml of deionized water to form solution B, solution A is immediately added to solution B to obtain a mixed solution, and the solution is aged and allowed to stand for 6 hours to form a white precipitate;

[0079] Step 2, collecting the precipitate obtained in step 1 by centrifugation, centrifuging at 8000 r / min for 5 times, each time for 5 minutes, washing once with distilled water, washing 4 times with anhydrous ethanol, placing the washed precipitate in a vacuum drying oven, and drying at 60° C. for 8 hours to obtain a Prussian blue microcubic lubricating additive (NaFe-PBA);

[0080] Step 3, using an ultrasonic cell crusher, uniformly disperse the Prussian blue microcubic lubricating additive obtained in step 2 in the dimethyl silicone base oil to obtain a composite lubricating oil containing the Prussian blue microcubic lubricating additive, wherein the mass of the Prussian blue microcubic lubricating additive is 100 mg, and the mass of the dimethyl silicone lubricating oil is 10 g.

[0081] Depend on Figure 1-Figure 2 It can be seen that the Prussian blue compound (NaFe-PBA) prepared by the co-precipitation method in Example 1 has a uniform particle size of about 2 um, which is consistent with its typical cubic structure characteristics, and has good dispersibility, regular arrangement and stable structure.

[0082] Depend on Figure 3 It can be seen that when the friction test process is between 50-100s, the friction coefficient of dimethyl silicone oil lubricant reaches a peak value of 0.20, then drops to 0.167, and experiences an upward stage at 300s, rising to about 0.18, and then the curve tends to be stable. Finally, the friction coefficient of dimethyl silicone oil lubricant slowly increases to 0.184.

[0083] Depend on Figure 4 It can be seen that for the composite lubricant containing the Prussian blue microcube additive prepared in Example 1, when the friction test process is between 0-100s, the friction coefficient curve reaches a peak value of 0.196, and then the friction curve shows an overall slow downward trend. Finally, the friction coefficient of the composite lubricant containing the Prussian blue microcube additive is reduced to 0.172, which is relatively lower than that of the dimethyl silicone oil lubricant (such as Figure 3), the friction coefficient was reduced by about 6.5%.

[0084] like Figure 5 It can be seen that the average friction coefficient of dimethyl silicone oil lubricant is 0.191, and the average friction coefficient of the composite lubricant containing Prussian blue microcube additives at different concentrations (the base lubricant in Example 1 contains 0.05wt% of Prussian blue additives, the base lubricant in Example 2 contains 0.1wt% of Prussian blue additives, the base lubricant in Example 3 contains 0.2wt% of Prussian blue additives, and the base lubricant in Example 4 contains 1wt% of Prussian blue additives) is basically the same, about 0.170, which is reduced by about 11%, indicating that adding Prussian blue microcube additives to dimethyl silicone oil lubricants can improve the wear reduction performance of dimethyl silicone oil to a certain extent.

[0085] like Figure 6 It can be seen that when the concentration of the composite lubricating oil containing the Prussian blue microcube additive of Example 4 is 1wt%, its wear volume (about 0.00923mm 3 ) showed a trend of decreasing to a greater extent, compared with dimethyl silicone oil lubricant (the wear volume of dimethyl silicone oil lubricant is about 0.01405mm 3 ), which is reduced by about 34%, indicating that adding Prussian blue microcubic additives to dimethyl silicone oil lubricants can improve the wear resistance of dimethyl silicone oil.

[0086] In addition, the wear volume of the composite lubricant containing the Prussian blue microcube additive of Example 1 is about 0.01393 mm 3 .

[0087] The wear volume of the composite lubricant containing the Prussian blue microcube additive of Example 2 is about 0.01291 mm 3 .

[0088] The wear volume of the composite lubricant containing the Prussian blue microcube additive of Example 3 is about 0.01201 mm 3 .

[0089] This shows that adding Prussian blue microcube additives to dimethyl silicone oil lubricating oil in Examples 1-3 can also improve the wear resistance of dimethyl silicone oil.

[0090] Example 5

[0091] A method for preparing a composite lubricating oil containing a cobalt-based Prussian blue microcubic additive (CoFe-PBA), comprising the following steps:

[0092] Step 1, at room temperature, first prepare the following two solutions. Solution A: 1mmol CoCl2·6H2O and 2mmol C6H5Na3O7·2H2O dispersed in 40ml deionized water, Solution B: 0.5mmol K3[Fe(CN)6] dispersed in 40mL deionized water. Then, solutions A and B were fully mixed under magnetic stirring (stirring speed: 320rpm). After stirring for 2 hours, aging was continued for 22 hours to generate a dark purple residue;

[0093] Step 2, collecting the precipitate obtained in step 1 by centrifugation, centrifuging at 8000 r / min for 5 times, each time for 5 minutes, washing once with distilled water, washing 4 times with anhydrous ethanol, placing the washed precipitate in a vacuum drying oven, and vacuum drying at 80° C. for 6 hours to obtain a cobalt-based Prussian blue microcubic lubricating additive (CoFe-PBA);

[0094] Step 3, using an ultrasonic cell pulverizer, uniformly disperse the cobalt-based Prussian blue microcubic lubricating additive obtained in step 2 in the dimethyl silicone base oil to obtain a composite lubricating oil containing the cobalt-based Prussian blue microcubic lubricating additive, wherein the mass of the Prussian blue microcubic lubricating additive is 100 mg, and the mass of the dimethyl silicone lubricating oil is 10 g (that is, in the composite lubricating oil, the content of the Prussian blue additive in the base lubricating oil is 1.0 wt%).

[0095] The friction coefficient of the composite lubricating oil containing the Prussian blue type microcube additive of Example 5 is 0.1702.

[0096] The wear volume of the composite lubricant containing the Prussian blue microcube additive at a concentration of 1 wt% in Example 5 is about 0.00529 mm 3 .

[0097] Example 6

[0098] A method for preparing a composite lubricating oil containing a Prussian blue microcube additive (MnFe-PBA), comprising the following steps:

[0099] The preparation method of the additive MnFe-PBA comprises the following steps: dissolving 3 mmol of sodium ferrocyanide decahydrate (Na4Fe(CN)6·10H2O) and 0.24 mol of sodium chloride (NaCl) in a beaker containing 100 ml of deionized water, stirring them thoroughly to obtain a mixed solution, transferring the mixed solution to a flask with a capacity of 500 ml, and heating the solution to 50-90° C. in a water bath. Dissolving 6 mmol of manganese sulfate monohydrate (MnSO4·H2O) in 100 ml of deionized water, stirring them uniformly, and then adding them dropwise to the mixed solution of sodium ferrocyanide and sodium chloride using a peristaltic pump, with a dropwise addition speed of 1 ml·min. -1 After the addition is complete, the mixture is aged for 2 hours. During the aging process, the temperature and stirring speed (300 rpm) are kept constant. The white precipitate is fully centrifuged and washed, and vacuum dried at 110°C for 8 hours to obtain a Prussian blue microcubic lubricating additive (MnFe-PBA);

[0100] By using an ultrasonic cell pulverizer, the Prussian blue microcubic lubricating additive obtained in the above step is evenly dispersed in the dimethyl silicone base oil to obtain a composite lubricating oil containing the Prussian blue microcubic lubricating additive, wherein the mass of the Prussian blue microcubic lubricating additive is 100 mg, and the mass of the dimethyl silicone lubricating oil is 10 g (that is, in the composite lubricating oil, the content of the Prussian blue additive in the base lubricating oil is 1.0 wt%).

[0101] The friction coefficient of the composite lubricating oil containing the Prussian blue type microcube additive at a concentration of 1 wt% in Example 6 is 0.1708.

[0102] The wear volume of the composite lubricant containing the Prussian blue microcube additive at a concentration of 1 wt% in Example 6 is about 0.00683 mm 3 .

[0103] Example 7

[0104] A method for preparing a composite lubricating oil containing a Prussian blue microcube additive (NiFe-PBA), comprising the following steps:

[0105] For the synthesis method of NiFe-PBA, 10mmol NiCl2·6H2O (2.377g), 21.22mmol sodium citrate (5.475g) and 33.74mmol PVP (polyvinyl pyrrolidone, 3.750g) materials were mixed and dissolved in 250ml of pure water. Then, under magnetic stirring (320rpm), the mixed solution was mixed evenly with K3[Fe(CN)6] aqueous solution (2.50mmol K3[Fe(CN)6], 0.824g, dissolved in 250ml of pure water) until it was clear. Then, the mixture was allowed to stand at 30°C for 72 hours. The light blue precipitate was centrifuged, washed alternately with pure water and anhydrous ethanol for 2-3 times, and then dried at 60°C for 8 hours to obtain a Prussian blue microcubic lubricating additive (NiFe-PBA);

[0106] Using an ultrasonic cell pulverizer, the Prussian blue microcubic lubricating additive obtained in the above step is evenly dispersed in the dimethyl silicone base oil to obtain a composite lubricating oil containing the Prussian blue microcubic lubricating additive, wherein the mass of the Prussian blue microcubic lubricating additive is 100 mg, and the mass of the dimethyl silicone lubricating oil is 10 g (that is, in the composite lubricating oil, the content of the base lubricating oil Prussian blue additive is 1.0 wt%).

[0107] The friction coefficient of the composite lubricating oil containing the Prussian blue type microcube additive at a concentration of 1 wt% in Example 7 is 0.1716.

[0108] The wear volume of the composite lubricating oil containing the Prussian blue microcube additive at a concentration of 1 wt% in Example 7 is about 0.00812 mm 3 .

[0109] Comparative Example 1

[0110] The preparation method is basically the same as that of Example 1, except that the Prussian blue microcubic lubricating additive (NaFePBA) is not aged and allowed to stand during preparation, and the particle size of the obtained additive is about 700-800 nm.

[0111] Step 3, using an ultrasonic cell crusher, uniformly disperse the Prussian blue microcubic lubricating additive obtained in step 2 in the dimethyl silicone base oil to obtain a composite lubricating oil containing the Prussian blue microcubic lubricating additive, wherein the mass of the Prussian blue microcubic lubricating additive is 5 mg, and the mass of the dimethyl silicone lubricating oil is 10 g.

[0112] The friction coefficient of the composite lubricating oil containing the Prussian blue type microcube additive at a concentration of 0.05 wt % in Comparative Example 1 is 0.1874.

[0113] The wear volume of the composite lubricant containing Prussian blue microcube additive at a concentration of 0.05 wt% in Comparative Example 1 is about 0.01538 mm 3 .

[0114] The above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A composite lubricating oil, characterized in that: The composite lubricating oil comprises a base lubricating oil and an additive, wherein the additive is a Prussian blue compound.

2. The composite lubricating oil according to claim 1, characterized in that: The base lubricating oil contains 0.05wt%-1wt% of additives.

3. The composite lubricating oil according to claim 1, characterized in that: The Prussian blue compound is selected from at least one of NaFe-PBA, CoFe-PBA, MnFe-PBA or NiFe-PBA.

4. The composite lubricating oil according to claim 1, characterized in that: The particle morphology of the Prussian blue compound is a cubic structure.

5. The composite lubricating oil according to claim 1, characterized in that: The particle size of the Prussian blue compound is 1 to 2 μm.

6. The composite lubricating oil according to claim 1, characterized in that: The base lubricating oil is dimethyl silicone lubricating oil.

7. The composite lubricating oil according to claim 1, characterized in that: The average friction coefficient of the composite lubricant is 0.170 to 0.174; The wear volume of the composite lubricant is 0.00529-0.01393 mm 3 .

8. A method for preparing a composite lubricating oil according to any one of claims 1 to 7, characterized in that: The following steps are involved: The additive is uniformly dispersed in the base lubricating oil to obtain the composite lubricating oil.

9. The method for preparing the composite lubricating oil according to claim 8, characterized in that: The uniform dispersion method is ultrasonic dispersion.

10. The method for preparing the composite lubricating oil according to claim 9, characterized in that: The total ultrasound time is 10 to 15 minutes, and the ultrasound power is 400 to 500w.

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