Porous oil-containing material for lubrication and preparation method thereof

Abstract

The invention relates to the technical field of lubricating materials, in particular to a porous oil-containing material for lubrication and a preparation method thereof.The preparation method comprises the following steps that S1, a mixed solution of polypropylene powder and lubricating oil is placed in a planetary stirrer to be mixed; and S2, pouring the mixed solution obtained in the step S1 into a mold, heating the mold in a hot blast drying oven at a heating temperature of 150 DEG C, and carrying out heat preservation for 2-8 h to obtain the porous oil-containing material. The method has the beneficial effects that the porous oil-containing material is prepared through cold pressing sintering molding, and the heat preservation time and the viscosity of a mixed solution system are main factors influencing the pore diameter of the porous oil-containing material. The viscosity of the components of the mixed solution is about 11000 mPas, the heat preservation time is 4 h, the pore diameter of the prepared porous oil-containing material ranges from 130 micrometers to 150 micrometers, and the minimum friction coefficient is 0.126. Meanwhile, the oil retention rate of the porous oil-containing material is 95.5%, and the porous oil-containing material shows good thermal stability at 0-200 DEG C.

Description

Technical Field

[0001] This invention relates to the field of lubrication materials technology, specifically to a porous oil-containing material for lubrication and its preparation method. Background Technology

[0002] Traditional lubrication technologies rely on external oil supply systems, which suffer from high maintenance costs, easy contamination of the lubricating medium, and poor adaptability to complex operating conditions (such as high temperature, vacuum, and high humidity). Porous oil-containing materials, due to their internal pores that can store and slowly release lubricating oil to form a stable oil film, have become an effective solution to these problems. In existing technologies, cold pressing sintering is the main preparation method for porous oil-containing materials, but it suffers from drawbacks such as long production cycles, low efficiency, and uneven pore distribution. Furthermore, the friction coefficient and oil retention rate of existing materials still have room for improvement, and their adaptability to extreme environments is insufficient. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a porous oil-containing material for lubrication that reduces the coefficient of friction, improves the oil retention rate and thermal stability, and a method for preparing the same.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a method for preparing a porous oil-containing material for lubrication, comprising the following steps: S1. A mixture of polypropylene powder and lubricating oil is placed in a planetary mixer and mixed; the viscosity of the mixture is 10500-12000 mPa•s, and the oil content of the mixture is 60%. S2. Pour the mixture obtained in step S1 into a mold, place the mold in a hot air drying oven for heating, set the heating temperature to 150℃, and keep it warm for 2 to 8 hours to obtain a porous oil-containing material.

[0005] Furthermore, in the above-mentioned method for preparing porous oil-containing materials for lubrication, the viscosity of the mixture in step S1 is 11613 mPa•s, and the heat preservation time in step S2 is 4h.

[0006] Furthermore, in the above-mentioned method for preparing porous oil-containing materials for lubrication, the mixing conditions in step S1 are as follows: rotation speed of 1500 r / min and mixing time of 5 min.

[0007] Furthermore, in the above-mentioned method for preparing porous oil-containing materials for lubrication, step S1 is followed by step S11: adding a set colorant to the mixture obtained in step S1 and continuing to stir for 5 min.

[0008] Furthermore, in the above-mentioned method for preparing porous oil-containing materials for lubrication, step S11 is followed by step S12: the mixed solution obtained in step S11 is placed in a vacuum defoaming system for defoaming for 10 min.

[0009] Furthermore, in the above-mentioned method for preparing porous oil-containing materials for lubrication, the pore size of the obtained porous oil-containing material is 135 μm to 150 μm.

[0010] Furthermore, in the above-mentioned method for preparing porous oil-containing materials for lubrication, 0.5% by mass of PTFE is added to the mixture in step S1.

[0011] Furthermore, in the above-mentioned method for preparing porous oil-containing materials for lubrication, 2.5% by mass of MoS2 is added to the mixture in step S1.

[0012] Another technical solution provided by the present invention is: to provide a porous oil-containing material prepared by the above-mentioned method for preparing porous oil-containing materials for lubrication.

[0013] The beneficial effects of this invention are as follows: In the porous oil-containing material for lubrication and its preparation method provided by this invention, the porous oil-containing material is prepared by cold pressing and sintering. The holding time and viscosity of the mixed solution system are the main factors affecting the pore size of the porous oil-containing material. When the viscosity of the mixed solution component is around 11000 mPa•s and the holding time is 4 h, the pore size range of the porous oil-containing material prepared is between 130 μm and 150 μm, and the minimum friction coefficient is 0.126. Simultaneously, the oil retention rate of the porous oil-containing material is 95.5%, and it exhibits good thermal stability from 0 to 200 °C.

[0014] Furthermore, both PTFE and MoS2, solid lubricants with different lubrication mechanisms, can effectively improve the friction coefficient of porous oil-impregnated materials. When the PTFE content is 0.5%, the friction coefficient of the porous oil-impregnated material is 0.055, while the friction coefficient of the porous oil-impregnated material without PTFE is 0.126. When the MoS2 content is 2.5%, the friction coefficient of the porous oil-impregnated material is 0.058, while the friction coefficient of the porous oil-impregnated material without MoS2 is 0.126. The addition of solid lubricants has a relatively small impact on the mechanical properties and oil-retention properties of porous oil-impregnated materials. Attached Figure Description

[0015] Figure 1 The figure shows the hardness of porous oil-containing materials in different mixed solution viscosity systems according to Example 1 of the present invention. Figure 2 The figure shows the pore size distribution of porous oil-containing materials in different mixed solution viscosity systems of Example 1 of the present invention; Figure 3 The figure shows the pore size distribution for different heat preservation times in Example 1 of the specific embodiment of the present invention. Figure 4 The figure shows the friction coefficient of porous oil-containing materials with different heat preservation times in Example 1 of the specific embodiment of the present invention; Figure 5 The figure shows the friction coefficients of porous oil-containing materials with different viscosity systems in Example 1 of the present invention. Figure 6 The figure shows the oil retention rate of porous oil-containing materials with different system viscosities in Example 1 of the present invention. Figure 7 The figure shows the oil retention rate of porous oil-containing materials with different heat preservation times in Example 1 of the specific embodiment of the present invention; Figure 8 The figure shows the thermal stability of porous oil-containing materials with different system viscosities in Example 1 of the present invention. Figure 9 The figure shows the hardness of porous oil-containing materials with different contents of PTFE in Example 2 of the specific embodiment of the present invention; Figure 10 The figure shows the viscosity of porous oil-containing materials with different contents of PTFE in Example 2 of the present invention. Figure 11 The figure shows the friction coefficient of porous oil-containing materials with different PTFE contents in Example 2 of the specific embodiment of the present invention; Figure 12 The figure shows the oil retention rate of porous oil-containing materials with different PTFE contents in Example 2 of the specific embodiment of the present invention; Figure 13 The figure shows the hardness of porous oil-containing materials with different MoS2 contents in Example 2 of the specific embodiment of the present invention; Figure 14 The figure shows the viscosity of porous oil-containing materials with different MoS2 contents in Example 2 of the specific embodiment of the present invention; Figure 15 The figure shows the friction coefficient of porous oil-containing materials with different MoS2 contents in Example 2 of the specific embodiment of the present invention; Figure 16 The figure shows the oil retention rate of porous oil-containing materials with different MoS2 contents in Example 2 of the specific embodiment of the present invention. Detailed Implementation

[0016] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0017] Example 1

[0018] This embodiment describes a method for preparing a porous oil-containing material for lubrication. The porous oil-containing material is prepared using a cold-pressing sintering process. The specific steps are as follows: First, polypropylene powder and lubricating oil are added to a beaker in a certain proportion and mixed in a planetary mixer. The mixing process is set as follows: rotation speed 1500 r / min, mixing time 5 min. Next, a predetermined colorant is added to the system, and stirring continues for 5 min to obtain a mixed solution. The prepared mixed solution is placed in a vacuum degassing system for 10 min to remove physical bubbles generated during mechanical stirring. Subsequently, the degassed mixed solution is poured into a mold, and the mold is placed in a hot air drying oven for heating. The heating temperature is set to 150 ℃, and the holding time is 2 h to 8 h to obtain the porous oil-containing material for lubrication.

[0019] The effects of system viscosity, holding time, and oil content on the microstructure, mechanical properties, and tribological properties of porous polypropylene oil-containing materials were tested during the preparation of porous oil-containing materials using polypropylene (PP) as the substrate and cold pressing sintering process.

[0020] 1. Characterization methods: (1) Hardness test: The hardness test shall be conducted at room temperature in accordance with GB / T531.1-2008. The sample shall be placed in a horizontal position, and 10 relatively dispersed points shall be measured. The highest and lowest values ​​shall be removed, and the average value shall be taken as the test result.

[0021] (2) Viscosity test: The viscosity test shall be conducted in accordance with GB / T 10247-2008. The sample solution shall be placed in a beaker with a diameter of not less than 70 mm and a height of not less than 120 mm, and a digital display viscometer shall be used to select an appropriate rotor and speed for the test.

[0022] (3) Microscopic morphology test: The prepared porous oil-containing material was cut using a cooling ultrathin slicer to obtain ultrathin porous oil-containing material sample slices, and then the pore structure of the sample was observed and photographed using an optical microscope. Using Image-Pro Plus 6.0 software, combined with optical imaging photographs, the number and size of micropores in the porous oil-containing material were measured and counted.

[0023] (4) Field emission scanning electron microscopy: The extracted porous oil-containing material was sputtered with gold and the test voltage was 15KV.

[0024] (5) Friction test: The friction test instrument used was a universal friction and wear tester. The upper sample was a 4 mm 304 stainless steel ball, and the lower sample was a porous oil-containing polypropylene material. The working parameters of the friction test were: load 5 N, stroke 20 mm, speed 20 mm / s, test temperature: room temperature and 70 ℃, relative humidity: 50%.

[0025] (6) Oil content test: The direct weighing method was used. The porous oil-containing material was placed in petroleum ether and left to stand for 4 h, then centrifuged in a centrifuge, and then placed in a ventilated place for 72 h. The mass of the material before and after centrifugation was measured. The porosity calculation formula is: θ=(1-m / M)*100%; where: M—total mass of the sample; m—mass of the sample after extraction.

[0026] (7) Oil retention rate test: The material was placed on a high-speed turntable with the following operating parameters: rotation speed 1500 r / min, and the weight was measured every 20 minutes for a total of 60 minutes. ρ = ((m1-m2) / m1) * 100%; where: m1—total mass of the sample; m2—mass of the sample after centrifugation.

[0027] (8) Specific surface area test: The specific surface area test was conducted according to the conditions of GB / T 19587-2017. The sample was placed in the instrument, and the nitrogen isotherm adsorption curve was obtained. The specific surface area of ​​the material was calculated using the BET theory formula.

[0028] (9) Thermal stability test (TG): The test conditions are as follows: sample mass 5-8 mg, nitrogen flow rate 50 mL / min, the sample is heated from room temperature to 800 ℃ at a heating rate of 20 ℃ / min, and the heating curve is recorded.

[0029] 2. Effects of preparation process and formulation on the pore structure of porous oil-containing materials 2.1 Porous oil-containing materials with different viscosities were prepared by selecting lubricating oils of different viscosities and polypropylene powders of different contents. As shown in Table 1, mixed solutions numbered A~C have an oil content of 60%, and mixed solutions numbered D~F have an oil content of 70%.

[0030] Table 1 Porous oil-containing materials with different system viscosities

[0031] Please see Figure 1 As shown, the homogeneity of the mixed solution improves with increasing system viscosity, which is beneficial for enhancing the hardness of the porous oil-impregnated material. Simultaneously, the surface hardness of the porous oil-impregnated material also increases with increasing polypropylene powder content. This improvement in surface hardness is beneficial to the wear resistance of the porous oil-impregnated material.

[0032] Please see Figure 2 As shown, using Image-Pro Plus 6.0 software, the optical imaging images of porous oil-containing materials were analyzed. The number and size of pores in the porous oil-containing materials were measured and statistically analyzed. For each batch of porous oil-containing material samples, five optical imaging images were collected, and the average pore size was calculated. The results are as follows: Figure 2As shown, under the same oil content, the pore size of the porous oil-containing material first decreases and then increases with the increase of the viscosity of the mixed solution system. The pore size decreases with increasing oil content. This is because the increased viscosity of the system promotes the uniform distribution of polypropylene powder within the system, resulting in uniformly distributed pores, which increases the pore "density" and decreases the pore size of the porous material.

[0033] 2.2 Effect of heat preservation time on pore size In the formation of the pore structure of porous oil-containing materials, the cold pressing time (holding time) is the main factor affecting the pore size. The pore size of the porous oil-containing material changes to varying degrees with changes in holding time. However, too short a holding time will result in incomplete reaction of the porous material. Extensive preliminary experiments have shown that holding times between 2 and 8 hours can yield porous oil-containing materials with a complete pore structure.

[0034] Image-Pro Plus 6.0 software was used to analyze the optically illuminated images of porous oil-containing materials, and the number and size of pores in the materials were measured and statistically analyzed. For each batch of porous oil-containing material samples, five optically illuminated images were collected, and the average pore size was calculated.

[0035] Please see Figure 3 The pore size of porous oil-containing materials changes with the extension of heat preservation time, showing a trend of first increasing, then decreasing, and then increasing again. For example... Figure 3 As shown, when the heat preservation time is 2 h to 4 h, the pore size of the porous oil-containing material increases with the extension of the heat preservation time, and the pore size distribution range increases from 100 μm to 115 μm to 135 μm to 150 μm. When the heat preservation time is 5 h to 8 h, the pore size of the porous oil-containing material gradually decreases with the extension of the heat preservation time, and the pore size distribution range decreases from 140 μm to 150 μm to 105 μm to 120 μm and then increases again to 140 μm to 150 μm.

[0036] 3. Results Analysis (1) Effect of aperture on tribological properties Frictional properties of porous oil-containing materials with different insulation times were tested. For example... Figure 4 As shown, the friction coefficient of the porous oil-containing material decreases with increasing holding time from 2 h to 4 h; however, when the holding time increases from 5 h to 8 h, the friction coefficient first increases and then decreases. The porous oil-containing materials prepared with holding times of 4 h and 8 h exhibit lower friction coefficients. Figure 3 Analysis of cell morphology shows that the pore size range with better friction performance of porous oil-containing materials is between 135μm and 150μm.

[0037] Please see Figure 5 The frictional properties of porous oil-containing materials with different viscosities were tested after a heat treatment time of 4 hours. Figure 5 As shown, the porous oil-impregnated material with mixed solution number B has the lowest coefficient of friction at 0.126. The optimal lubrication pore size range for the porous oil-impregnated material is between 130 μm and 145 μm. Based on the above experimental analysis and statistical data, the optimal lubrication pore size range for the porous oil-impregnated material is 130 μm to 150 μm.

[0038] (2) Analysis of oil retention performance Please see Figure 6 and Figure 7 The porous oil-containing material was fixed on the test platform, and its weight was tested every 20 minutes for a total of 60 minutes.

[0039] Oil retention performance such as Figure 6 As shown, porous oil-containing materials exhibit good oil retention performance under continuous centrifugal force. The lowest oil retention rate is observed in porous oil-containing material B of the mixed solution. Porous oil-containing materials with pore sizes between 130 μm and 150 μm show the best lubricating performance, with the easiest lubricating oil precipitation. Figure 4 The friction coefficients shown are consistently the lowest. Overall, porous oil-impregnated materials exhibit good oil retention properties and can provide good, continuous lubrication. The oil retention rates of porous oil-impregnated materials prepared with different holding times were also tested, such as... Figure 7 As shown, it exhibits good oil retention performance.

[0040] (3) Thermal stability performance analysis Please see Figure 8 Thermogravimetric analyzer was used to observe the temperature-mass change curve of the porous material. Figure 8 As shown, the material exhibits stable performance within the temperature range of 0–200℃, with no change in mass observed as temperature increases. However, the mass of the porous material rapidly decreases above 200℃. This indicates that the porous oil-containing material possesses excellent thermal stability within the 0–200℃ range, and given that the operating temperature of the porous oil-containing material is far below 200℃, its thermal stability remains excellent.

[0041] 4. Conclusion: (1) As the viscosity of the mixed solution increases, the pore distribution of the prepared porous oil-containing material becomes more uniform, and the hardness of the porous oil-containing material also increases accordingly. The pore size of the porous oil-containing material first decreases and then increases with the increase of the viscosity of the mixed solution, and the pore size decreases with the increase of the oil content. With the change of the holding time, when the holding time is 2 h to 4 h, the pore size of the porous oil-containing material increases with the extension of the holding time; when the holding time is 5 h to 8 h, the pore size of the porous oil-containing material first decreases and then increases with the extension of the holding time.

[0042] (2) Frictional properties of porous oil-containing materials with different pore sizes were tested. The porous oil-containing material prepared by mixing the solution with component B and holding it at a temperature of 4 h had the lowest friction coefficient of 0.126, and the pore size range of the porous oil-containing material was between 130 μm and 150 μm. If the pore size of the porous oil-containing material is too small, it will lead to excessive capillary force, and the lubricating oil will not be able to precipitate in time, resulting in an excessively high friction coefficient. If the pore size of the porous oil-containing material is too large, the lubricating oil will easily precipitate, but the excessively large pore size will lead to excessively low surface hardness, which will easily cause surface wear.

[0043] (3) The friction coefficient of porous oil-impregnated materials decreases to varying degrees with increasing operating temperature, exhibiting good friction performance. Porous materials with pore sizes ranging from 130 μm to 150 μm show particularly outstanding friction reduction. Porous oil-impregnated materials exhibit good oil retention performance, with a minimum oil retention rate of 95.5% even after 60 minutes of continuous operation at 1500 rpm. Furthermore, the materials possess excellent thermal stability within the range of 0-200℃. Isothermal adsorption curves and SEM images confirm that the pores in the porous oil-impregnated materials are through-pores.

[0044] Example 2

[0045] A method for preparing a porous oil-containing material for lubrication, based on Example 1, involves adding a solid lubricant. The method includes the following steps: S1. A mixture of polypropylene powder and lubricating oil is placed in a planetary mixer for mixing; the viscosity of the mixture is 11613 mPa·s, and the oil content of the mixture is 60%; the mixture also includes 0.5%-2% PTFE and 0.5%-2.5% MoS2 by mass percentage. The mixing conditions were as follows: rotation speed of 1500 r / min and mixing time of 5 min.

[0046] S11: Add the set colorant to the mixture obtained in step S1 and continue stirring for 5 min.

[0047] S12: Place the mixed solution obtained in step S11 into a vacuum defoaming system and defoam for 10 min.

[0048] S2. Pour the mixture obtained in step S1 into a mold, place the mold in a hot air drying oven for heating, set the heating temperature to 150℃, and keep it at that temperature for 4 hours to obtain a porous oil-containing material.

[0049] 1. The effect of different PTFE contents on porous oil-containing materials The different amounts of PTFE added to the mixture in step S1 of the above method are shown in Table 2. Table 2

[0050] The optimal process was used to fabricate porous oil-impregnated materials, and the effect of PTFE content on the hardness of these materials was investigated. Figure 9 As can be seen from the data, the hardness of the porous oil-containing material changes within ±7% with the increase of PTFE content, which indirectly proves that the addition of PTFE has little effect on the pore size distribution of the porous oil-containing material, and the porous oil-containing material has a high surface hardness and good wear resistance.

[0051] The viscosity of a mixed solution reflects its dispersion during mechanical stirring. Poor dispersion leads to increased viscosity, uneven pore size distribution, and excessive pore size variation in porous materials, thus affecting their wear resistance and oil retention. Figure 10 As shown, the viscosity of the system increases slowly with varying PTFE content in the mixed solution. This ensures that the pore structure of the porous oil-containing material is not excessively altered by the addition of PTFE.

[0052] Tribological performance test results of porous oil-impregnated materials with different PTFE contents are as follows: Figure 11 As shown, the tribological properties of porous oil-impregnated materials are improved to varying degrees with the addition of PTFE. A small amount of PTFE can significantly reduce the coefficient of friction, because the low surface polarity of PTFE can lower the system's coefficient of friction. Therefore, adding a small amount of PTFE can greatly improve the tribological properties of porous oil-impregnated materials. However, as the PTFE content increases to 3%, the hardness and wear resistance of the porous oil-impregnated material decrease, resulting in an increase in the coefficient of friction.

[0053] like Figure 12 As shown, the addition of PTFE has little effect on the oil retention rate of porous oil-impregnated materials. In particular, when the PTFE content is 0.5% and 2%, the oil retention rates of the porous oil-impregnated materials are 95% and 97%, respectively. The above data demonstrates the excellent oil retention performance of porous oil-impregnated materials, showing a clear advantage in oil retention capacity and providing reliable lubrication guarantee for relevant application scenarios.

[0054] 2. Effects of different MoS2 contents on porous oil-containing materials The different amounts of MoS2 added to the mixture in step S1 of the above method are shown in Table 3. Table 3

[0055] The optimal process was used to fabricate porous oil-impregnated materials, and the effect of MoS2 content on the surface hardness of these materials was investigated. Figure 13 As can be seen from the data, the hardness of the porous oil-containing material changes within ±5% with the increase of MoS2 content, which indirectly proves that the addition of MoS2 has little effect on the pore size distribution of the porous oil-containing material, and the porous oil-containing material has high surface hardness and good wear resistance.

[0056] The effects of different MoS2 contents on the dispersion of porous oil-containing materials were studied, such as... Figure 14 As shown, the viscosity of porous oil-impregnated materials with different MoS2 contents does not change significantly. This indicates that adding MoS2 does not affect the pore distribution of the porous oil-impregnated material, ensuring uniform distribution of MoS2 and playing a role in reducing friction and wear and improving bearing life in porous oil-impregnated materials.

[0057] Tribological properties were tested on porous oil-impregnated materials with different MoS2 content. Figure 15 As shown, the tribological properties of porous materials are improved to varying degrees with the addition of MoS2. The main reason for the change in tribological properties of porous oil-impregnated materials by adding MoS2 is roughly the same as that of PTFE. MoS2 is distributed in porous oil-impregnated materials, increasing the surface hardness. The layers of MoS2 reduce direct contact between friction surfaces through sliding. As the MoS2 content increases, MoS2 accumulates on the friction surface of the porous oil-impregnated material, and the interlacing of MoS2 layers leads to an increase in the coefficient of friction.

[0058] like Figure 16 As shown, the addition of MoS2 has little impact on the oil retention rate of porous oil-containing materials, and the oil retention rate of different MoS2 contents is not less than 94%, demonstrating the excellent continuous output of lubricating oil performance of porous oil-containing materials. It has a clear advantage in oil retention capacity and can provide reliable lubrication guarantee for relevant application scenarios.

[0059] 3. Conclusion: (1) Studies have found that the friction coefficient of porous oil-containing materials decreases with the addition of solid lubricants, which can effectively improve the friction performance of porous oil-containing materials without affecting the oil retention rate of porous oil-containing materials.

[0060] (2) As the PTFE content increases, the friction coefficient of porous oil-containing materials first decreases and then increases. This is because the PTFE content affects the surface roughness and hardness of porous oil-containing materials. When PTFE (0.5%, 2%) is evenly dispersed, the surface roughness is low and the hardness is high, which can effectively reduce the friction coefficient of porous oil-containing materials. However, excessive PTFE (3%) will lead to an increase in the surface roughness and a decrease in the hardness of porous oil-containing materials, resulting in a decrease in friction performance.

[0061] (3) With the increase of MoS2 content, the friction coefficient of the porous oil-containing material shows the same trend as PTFE, that is, it first decreases and then increases. However, due to the smaller particle size of MoS2 (800 mesh), the addition of MoS2 has little effect on the viscosity of the mixed solution, and the hardness of the prepared porous oil-containing material changes by less than ±5%. When MoS2 (0.5% and 2.5%) is uniformly dispersed, the surface roughness is low and the hardness is high, which can effectively reduce the friction coefficient of the porous oil-containing material. However, excessive MoS2 (3%) will lead to an increase in the surface roughness and a decrease in the hardness of the porous oil-containing material, resulting in a decrease in friction performance.

[0062] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for preparing a porous oil-containing material for lubrication, characterized in that, Includes the following steps: S1. The mixture of polypropylene powder and lubricating oil is placed in a planetary mixer and mixed; the viscosity of the mixture is 10500-12000 mPa·s, and the oil content of the mixture is 60%. S2. Pour the mixture obtained in step S1 into a mold, place the mold in a hot air drying oven for heating, set the heating temperature to 150℃, and keep it warm for 2 to 8 hours to obtain a porous oil-containing material.

2. The method for preparing a porous oil-containing material for lubrication according to claim 1, characterized in that, The viscosity of the mixture in step S1 is 11613 mPa•s, and the heat preservation time in step S2 is 4h.

3. The method for preparing a porous oil-containing material for lubrication according to claim 1, characterized in that, The mixing conditions in step S1 are as follows: rotation speed of 1500 r / min and mixing time of 5 min.

4. The method for preparing a porous oil-containing material for lubrication according to claim 1, characterized in that, The step S1 is followed by step S11: adding the set colorant to the mixture obtained in step S1 and continuing to stir for 5 minutes.

5. The method for preparing a porous oil-containing material for lubrication according to claim 4, characterized in that, The step S11 is followed by step S12: the mixed solution obtained in step S11 is placed in a vacuum defoaming system and defoamed for 10 minutes.

6. The method for preparing a porous oil-containing material for lubrication according to claim 1, characterized in that, The pore size of the obtained porous oil-containing material is 135 μm to 150 μm.

7. The method for preparing a porous oil-containing material for lubrication according to claim 1, characterized in that, In step S1, 0.5%-2% by mass of PTFE is also added to the mixture.

8. The method for preparing a porous oil-containing material for lubrication according to claim 1, characterized in that, The mixture in step S1 also contains 0.5%-2.5% by mass of MoS2.

9. A porous oil-containing material prepared by the method for preparing a porous oil-containing material for lubrication according to any one of claims 1-8.

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