A porous oil-containing polymer material, a method for preparing the same, and an application thereof

Abstract

The present application belongs to the technical field of lubrication, and provides a porous oil-containing polymer material, a preparation method and application thereof.The porous oil-containing polymer material comprises a porous polymer matrix, a solid lubricating film deposited on the porous polymer matrix, and liquid lubricating oil stored in the pores of the porous polymer matrix on which the solid lubricating film is deposited.The present application realizes solid-liquid synergistic lubrication by depositing a solid lubricating film on the surface of the porous polymer matrix and adsorbing and storing liquid lubricating oil, so that the porous oil-containing polymer material can still realize effective lubrication when the lubricating oil supply is insufficient and the frictional shear action occurs between the porous oil-containing polymer material and the counterpart, thereby reducing the friction and wear.Meanwhile, the deposition of the solid lubricating film will not cause the pore structure of the porous polymer matrix to be blocked, and will not affect the storage, release and re-absorption of the lubricating oil;and the friction and wear of the porous oil-containing polymer material are significantly reduced.

Description

A porous oil-containing polymer material, its preparation method and application Technical Field

[0001] This invention relates to the field of lubrication technology, and in particular to a porous oil-containing polymer material, its preparation method, and its application. Background Technology

[0002] With the continuous advancement and development of modern science and technology, the global demand for high-precision technologies is increasing year by year. Among these, porous oil-impregnated polyimide materials utilize their internal pore structure to store lubricating oil, achieving self-circulating oil storage and supply without the need for external oil supply equipment. They possess characteristics such as high precision, high reliability, long service life, and maintenance-free operation, making them important in aerospace and high-end equipment fields. Although porous oil-impregnated polyimide materials can reduce the frictional shearing action between the mating material and the porous oil-impregnated polyimide material by forming a lubricating film at the interface, insufficient lubricating oil supply still cannot prevent frictional shearing action between the mating material and the porous oil-impregnated polyimide material, leading to frictional wear. Therefore, the lubrication performance of existing porous oil-impregnated polyimide materials needs further improvement. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide a porous oil-containing polymer material, its preparation method, and its application. The porous oil-containing polymer material of this invention can still achieve effective lubrication and reduce friction and wear even when the lubricating oil supply is insufficient or when frictional shearing occurs between the materials.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0005] The present invention provides a porous oil-containing polymer material, comprising a porous polymer matrix, a solid lubricating film deposited on the porous polymer matrix, and liquid lubricating oil stored in the pores of the porous polymer matrix to which the solid lubricating film is deposited;

[0006] The solid lubricating film is made of one or more of diamond-like carbon, graphene, molybdenum disulfide, and black phosphorus.

[0007] Preferably, the porous polymer matrix is ​​made of one of polyimide, nylon, polyetheretherketone, and polyphenylene sulfide.

[0008] Preferably, the porous polymer matrix has a pore size of 0–10 μm and a porosity of 0–50%, wherein neither the pore size nor the porosity is 0.

[0009] Preferably, the thickness of the solid lubricating film is 0–3 μm, and is not 0.

[0010] Preferably, the liquid lubricating oil includes one or more of the following: base oil PAO, Pegasus II, RIPP555, and Mobil gear oil.

[0011] The present invention also provides a method for preparing the porous oil-containing polymer material described in the above technical solution, comprising the following steps:

[0012] Provide a porous polymer matrix;

[0013] A solid lubricating film is deposited on the porous polymer matrix to obtain a porous polymer matrix with a solid lubricating film deposited thereon.

[0014] The porous polymer matrix with the deposited solid lubricating film is impregnated in liquid lubricating oil to obtain the porous oil-containing polymer material.

[0015] Preferably, when the porous polymer matrix is ​​made of polyimide, the method for preparing the porous polymer matrix includes the following steps:

[0016] The polyimide powder is hot-pressed to obtain the porous polymer matrix;

[0017] The hot pressing temperature is 300–380°C, and the pressure is 6–20 MPa.

[0018] Preferably, when the solid lubricating film is made of diamond-like carbon, the deposition method is plasma-assisted chemical vapor deposition.

[0019] Preferably, the impregnation temperature is 60–150°C, the time is 12–72 h, and the impregnation is carried out in a vacuum environment.

[0020] The present invention also provides the application of the porous oil-containing polymer material described in the above technical solution or the porous oil-containing polymer material prepared by the preparation method described in the above technical solution in the field of lubrication.

[0021] This invention provides a porous oil-containing polymer material.

[0022] This invention achieves solid-liquid synergistic lubrication by depositing a solid lubricating film on the surface of a porous polymer matrix and adsorbing and storing liquid lubricating oil. This allows the porous oil-containing polymer material to maintain effective lubrication even when lubricating oil supply is insufficient or when frictional shearing occurs between the polymer and its substrate, thus reducing friction and wear. Simultaneously, the deposition of the solid lubricating film does not clog the pore structure of the porous polymer matrix, and does not affect the storage, release, or reabsorption of lubricating oil; furthermore, it significantly reduces the friction and wear of the porous oil-containing polymer material. Attached Figure Description

[0023] Figure 1. Flowchart of the preparation method provided by the present invention;

[0024] Figure 2 shows the Raman spectra of PPI-DLC-1.5 obtained in Example 2 and PI-DLC-1.5 obtained in Comparative Example 4;

[0025] Figure 3 is a cross-sectional scanning electron microscope image of PPI-DLC-1.5 obtained in Example 2;

[0026] Figure 4 shows the pore size distribution of PPI-DLC-1.5 obtained in Example 2;

[0027] Figure 5 shows the mercury entry and exit curves of PPI-DLC-1.5 obtained in Example 2. Detailed Implementation

[0028] The present invention provides a porous oil-containing polymer material, comprising a porous polymer matrix, a solid lubricating film deposited on the porous polymer matrix, and liquid lubricating oil stored in the pores of the porous polymer matrix to which the solid lubricating film is deposited;

[0029] The solid lubricating film is made of one or more of diamond-like carbon, graphene, molybdenum disulfide, and black phosphorus.

[0030] Unless otherwise specified, the raw materials used in this invention are preferably commercially available products.

[0031] The porous oil-containing polymer material provided by this invention includes a porous polymer matrix. In this invention, the porous polymer matrix is ​​preferably made of one of polyimide, nylon, polyetheretherketone (PEEK), and polyphenylene sulfide (PPS), specifically polyimide. In this invention, the pore size of the porous polymer matrix is ​​preferably 0–10 μm, and the porosity is preferably 0–50%, wherein neither the pore size nor the porosity is zero. In this invention, the pore size of the porous polymer matrix is ​​further preferably 0.1–10 μm, specifically preferably 0.1 μm, 0.5 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, 5 μm, 5.5 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, 8 μm, 8.5 μm, 9 μm, 9.5 μm, or 10 μm. In this invention, the porosity of the porous polymer matrix is ​​preferably 0.1% to 50%, specifically preferably 0.1%, 1%, 5%, 9%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 48%, or 50%.

[0032] The porous oil-containing polymer material provided by this invention includes a solid lubricating film deposited on the porous polymer matrix. In this invention, the solid lubricating film is made of one or more of diamond-like carbon (DLC), graphene, molybdenum disulfide, and black phosphorus, preferably diamond-like carbon (DLC). In this invention, the thickness of the solid lubricating film is preferably 0–3 μm, but not 0, more preferably 0.1–3 μm, more preferably 0.5–2.5 μm, and specifically preferably 0.1 μm, 0.5 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, or 3 μm.

[0033] The porous oil-containing polymer material provided by this invention comprises liquid lubricating oil stored within the pores of a porous polymer matrix to which a solid lubricating film has been deposited. In this invention, the liquid lubricating oil preferably comprises one or more of the following: base oil PAO, Pegasus II, RIPP555, and Mobil gear oil, specifically preferably base oil PAO, which preferably includes PAO4 and / or PAO10.

[0034] In this invention, the use of solid lubricating film and liquid lubricating oil achieves lubrication of solid-liquid system. Compared with materials without solid lubricating film, the porous oil-containing polymer material of this invention can still achieve effective lubrication and reduce friction and wear when the lubricating oil supply is insufficient or when the pair of porous oil-containing polymer materials undergoes friction and shearing action.

[0035] The present invention also provides a method for preparing the porous oil-containing polymer material described in the above technical solution, comprising the following steps:

[0036] Provide a porous polymer matrix;

[0037] A solid lubricating film is deposited on the porous polymer matrix to obtain a porous polymer matrix with a solid lubricating film deposited thereon.

[0038] The porous polymer matrix with the deposited solid lubricating film is immersed in liquid lubricating oil to obtain the porous oil-containing polymer material.

[0039] This invention provides a porous polymer matrix.

[0040] In this invention, when the porous polymer matrix is ​​preferably made of polyimide, the method for preparing the porous polymer matrix preferably includes the following steps:

[0041] Polyimide powder is hot-pressed to obtain the porous polymer matrix. In this invention, the hot-pressing temperature is preferably 300-380℃, specifically 300℃, 310℃, 320℃, 330℃, 340℃, 350℃, 360℃, 370℃, or 380℃; the pressure is preferably 6-20MPa, specifically 6MPa, 8MPa, 10MPa, 12MPa, 14MPa, 16MPa, 18MPa, or 20MPa; the time is preferably 0.5-8h, specifically 0.5h, 1h, 2h, 3h, 4h, 5h, 6h, 7h, or 8h; after hot pressing, this invention preferably further includes: removing the pressure while maintaining a constant volume, and allowing natural cooling to obtain the porous polymer matrix.

[0042] After obtaining a porous polymer matrix, the present invention deposits a solid lubricating film on the porous polymer matrix to obtain a porous polymer matrix with a solid lubricating film deposited thereon.

[0043] In this invention, when the material of the solid lubricating film is preferably diamond-like carbon, the deposition method is preferably plasma-assisted chemical vapor deposition (PACVD). In this invention, the parameters of the plasma-assisted chemical vapor deposition preferably include: a vacuum degree of 4 × 10⁻⁶. -3 Pa, substrate bias voltage -690V, pulse frequency 40kHz, C2H2 flow rate 260sccm.

[0044] In this invention, the thickness of the solid lubricating film is preferably 0 to 3 μm, and not 0, more preferably 0.1 to 3 μm, more preferably 0.5 to 2.5 μm, and specifically preferably 0.1 μm, 0.5 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm or 3 μm.

[0045] After obtaining a porous polymer matrix with a solid lubricating film deposited thereon, the present invention impregnates the porous polymer matrix with the solid lubricating film deposited thereon with liquid lubricating oil to obtain the porous oil-containing polymer material.

[0046] In this invention, the impregnation temperature is preferably 60–150°C, specifically 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, or 150°C; the time is preferably 12–72 hours, specifically 12 hours, 18 hours, 24 hours, 30 hours, 36 hours, 42 hours, 48 ​​hours, 54 hours, 60 hours, 66 hours, or 72 hours; the impregnation is preferably carried out in a vacuum environment, and the vacuum degree of the vacuum environment is preferably 10–10000 Pa, specifically 10 Pa, 100 Pa, 1000 Pa, or 10000 Pa.

[0047] After the impregnation is completed, the present invention preferably further includes removing the sample and wiping the liquid lubricating oil on the surface of the sample to obtain the porous oil-containing polymer material.

[0048] When the porous polymer matrix is ​​a porous polyimide matrix (denoted as PPI) and the solid lubricating film is made of diamond-like carbon (DLC), the preparation method flowchart provided by this invention is shown in Figure 1. Specifically, the method is as follows: First, a porous polyimide matrix PPI is provided. Then, DLC is deposited on the surface of PPI to obtain a porous polyimide matrix with a diamond-like carbon film deposited on it, denoted as PPI-DLC. Then, PPI-DLC is immersed in liquid lubricating oil, referred to as oil immersion. After immersion, the oil on the surface of the material is wiped dry to obtain a porous oil-containing polymer material, denoted as OLPPI-DLC.

[0049] The present invention also provides the application of the porous oil-containing polymer material described in the above technical solution or the porous oil-containing polymer material prepared by the preparation method described in the above technical solution in the field of lubrication.

[0050] The present invention does not impose specific limitations on the application of the porous oil-containing polymer material; those skilled in the art can make settings according to actual needs.

[0051] The following detailed description, in conjunction with embodiments, illustrates the porous oil-containing polymer materials, their preparation methods, and applications provided by the present invention. However, these descriptions should not be construed as limiting the scope of protection of the present invention.

[0052] Example 1

[0053] OLPPI-DLC-0.5 preparation method:

[0054] (1) The polyimide powder was hot-pressed at 300℃ and 8MPa for 2h, and then the pressure was removed to keep the volume constant and the temperature was allowed to drop naturally to obtain a porous polyimide matrix with a pore size of 7μm and a porosity of 48%, which is denoted as PPI.

[0055] (2) Plasma-assisted chemical vapor deposition was used (parameters included: vacuum degree of 4×10⁻⁶). -3 Diamond-like carbon (DLC) was deposited on the surface of a porous polyimide substrate at a substrate bias voltage of -690V, a pulse frequency of 40kHz, and a C2H2 flow rate of 260sccm. The thickness of the DLC film was 0.5μm by plasma-assisted chemical vapor deposition (PACVD) to obtain PPI-DLC-0.5.

[0056] (3) Then PPI-DLC-0.5 is immersed in a beaker containing PAO 10 and immersed for 12 hours at 150°C and a vacuum of 10000Pa. Then it is removed from the beaker and the excess PAO 10 on the surface is wiped off to obtain OLPPI-DLC-0.5.

[0057] Example 2

[0058] OLPPI-DLC-1.5 preparation method:

[0059] (1) The polyimide powder was hot-pressed at 360℃ and 12MPa for 1h, and then the pressure was removed while the volume remained unchanged. The product was allowed to cool naturally to obtain a porous polyimide matrix with a pore size of 2μm and a porosity of 15%, which was denoted as PPI.

[0060] (2) Plasma-assisted chemical vapor deposition was used (parameters included: vacuum degree of 4×10⁻⁶). -3 Diamond-like carbon (DLC) was deposited on the surface of a porous polyimide substrate at a substrate bias of -690V, a pulse frequency of 40kHz, and a C2H2 flow rate of 260sccm. The thickness of the DLC film was 1.5μm by plasma-assisted chemical vapor deposition (PACVD) to obtain PPI-DLC-1.5.

[0061] (3) Then PPI-DLC-1.5 is immersed in a beaker containing PAO 10 and immersed for 72 hours at 80°C and 100 Pa vacuum. Then it is removed from the beaker and the excess PAO 10 on the surface is wiped off to obtain OLPPI-DLC-1.5.

[0062] Example 3

[0063] OLPPI-DLC-3.0 preparation method:

[0064] (1) The polyimide powder was hot-pressed at 380℃ and 20MPa for 0.5h, and then the pressure was removed while the volume remained unchanged. The product was allowed to cool naturally to obtain a porous polyimide matrix with a pore size of 1μm and a porosity of 9%, which was denoted as PPI.

[0065] (2) Plasma-assisted chemical vapor deposition was used (parameters included: vacuum degree of 4×10⁻⁶). -3 Diamond-like carbon (DLC) was deposited on the surface of a porous polyimide substrate at a substrate bias voltage of -690V, a pulse frequency of 40kHz, and a C2H2 flow rate of 260sccm. The thickness of the DLC film was 3.0μm by plasma-assisted chemical vapor deposition (PACVD) to obtain PPI-DLC-3.0.

[0066] (3) Then PPI-DLC-3.0 is immersed in a beaker containing PAO 10 and immersed for 12 hours at 150°C and 1000Pa vacuum. Then it is removed from the beaker and the excess PAO 10 on the surface is wiped off to obtain OLPPI-DLC-3.0.

[0067] Comparative Example 1

[0068] OLPPI-DLC-0 preparation method:

[0069] (1) The polyimide powder was hot-pressed at 380℃ and 6MPa for 1h, and then the pressure was removed while the volume remained unchanged. The product was naturally cooled to obtain a porous polyimide matrix with a pore size of 9μm and a porosity of 5%, which was denoted as PPI.

[0070] (2) Plasma-assisted chemical vapor deposition was used (parameters included: vacuum degree of 4×10⁻⁶). -3 Diamond-like carbon (DLC) was deposited on the surface of a porous polyimide substrate at a substrate bias voltage of -690V, a pulse frequency of 40kHz, and a C2H2 flow rate of 260sccm. The thickness of the DLC film was reduced to 0μm by plasma-assisted chemical vapor deposition, resulting in PPI-DLC-0.

[0071] (3) Then PPI-DLC-0 is immersed in a beaker containing PAO 10 and immersed for 12 hours at 60°C and a vacuum of 10Pa. Then it is removed from the beaker and the excess PAO 10 on the surface is wiped off to obtain OLPPI-DLC-0.

[0072] Comparative Example 2

[0073] Preparation of OLPI-DLC-0

[0074] (1) The polyimide powder was hot-pressed at 380℃ and 20MPa for 2h, and the pressure was maintained while the temperature was reduced to obtain a non-porous polyimide matrix with a pore size of 0μm and a porosity of 0%, which is denoted as PI.

[0075] (2) Plasma-assisted chemical vapor deposition was used (parameters included: vacuum degree of 4×10⁻⁶). -3 Diamond-like carbon (DLC) was deposited on the surface of a non-porous polyimide substrate at a substrate bias voltage of -690V, a pulse frequency of 40kHz, and a C2H2 flow rate of 260sccm. The thickness of the DLC film was reduced to 0μm by plasma-assisted chemical vapor deposition (PCVD), resulting in PI-DLC-0.

[0076] (3) Then PI-DLC-0 is immersed in a beaker containing PAO 10 and immersed for 72 hours at 60°C and 100 Pa vacuum. Then it is removed from the beaker and the excess PAO 10 on the surface is wiped off to obtain OLPI-DLC-0.

[0077] Comparative Example 3

[0078] Preparation of OLPI-DLC-0.5:

[0079] (1) Polyimide powder was hot-pressed at 370℃ and 16MPa for 4h, and the pressure was maintained while the temperature was lowered to obtain a non-porous polyimide matrix with a pore size of 0μm and a porosity of 0%, which is denoted as PI.

[0080] (2) Plasma-assisted chemical vapor deposition was used (parameters included: vacuum degree of 4×10⁻⁶). -3 Diamond-like carbon (DLC) was deposited on the surface of a non-porous polyimide substrate at a substrate bias voltage of -690V, a pulse frequency of 40kHz, and a C2H2 flow rate of 260sccm. The thickness of the DLC film was 0.5μm by plasma-assisted chemical vapor deposition (PECVD) to obtain PI-DLC-0.5.

[0081] (3) Then PI-DLC-0.5 is immersed in a beaker containing PAO 10 and immersed for 12 hours at 100°C and a vacuum of 500Pa. Then it is removed from the beaker and the excess PAO 10 on the surface is wiped off to obtain OLPI-DLC-0.5.

[0082] Comparative Example 4

[0083] Preparation of OLPI-DLC-1.5:

[0084] (1) Polyimide powder was hot-pressed at 350℃ and 12MPa for 7h, and the pressure was maintained while the temperature was lowered to obtain a non-porous polyimide matrix with a pore size of 0μm and a porosity of 0%, which is denoted as PI.

[0085] (2) Plasma-assisted chemical vapor deposition was used (parameters included: vacuum degree of 4×10⁻⁶). -3 Diamond-like carbon (DLC) was deposited on the surface of a non-porous polyimide substrate at a substrate bias voltage of -690V, a pulse frequency of 40kHz, and a C2H2 flow rate of 260sccm. The thickness of the DLC film was 1.5μm by plasma-assisted chemical vapor deposition (PECVD) to obtain PI-DLC-1.5.

[0086] (3) Then PI-DLC-1.5 is immersed in a beaker containing PAO 10 and immersed for 48 hours at 120°C and a vacuum of 5000Pa. Then it is removed from the beaker and the excess PAO 10 on the surface is wiped off to obtain OLPI-DLC-1.5.

[0087] Comparative Example 5

[0088] Preparation of OLPI-DLC-3.0:

[0089] (1) The polyimide powder was hot-pressed at 340℃ and 20MPa for 8h, and the pressure was maintained while the temperature was lowered to obtain a non-porous polyimide matrix with a pore size of 0μm and a porosity of 0%.

[0090] (2) Plasma-assisted chemical vapor deposition was used (parameters included: vacuum degree of 4×10⁻⁶). -3 Diamond-like carbon (DLC) was deposited on the surface of a non-porous polyimide substrate at a substrate bias voltage of -690V, a pulse frequency of 40kHz, and a C2H2 flow rate of 260sccm. The thickness of the DLC film was 3.0μm by plasma-assisted chemical vapor deposition (PECVD) to obtain PI-DLC-3.0.

[0091] (3) Then PI-DLC-3.0 is immersed in a beaker containing PAO 10 and immersed for 12 hours at 150°C and 10 Pa vacuum. Then it is removed from the beaker and the excess PAO 10 on the surface is wiped off to obtain OLPI-DLC-3.0.

[0092] Tribological performance testing was conducted on a reciprocating friction and wear testing machine (UMT-3) using a ball-disc contact method. A steel ball (GCr15, 3mm) was selected as the pair for the friction test. The test was run continuously for 2 hours under conditions of 10N and 11Hz, and the wear track volume was measured using a 3D profilometer. The results are shown in Table 1.

[0093] Table 1 summarizes the pore size, porosity, and tribological properties of the examples and comparative examples.

[0094] Sample pore size (μm) Porosity (%) DLC thickness (μm) Friction coefficient Wear amount (mm) 3 Comparative Example 2000: 0.28619.335; Comparative Example 3000: 0.50: 0.19524.564; Comparative Example 4001: 1.50: 0.18020.270; Comparative Example 5003: 3.00: 0.17518.512; Comparative Example 19500: 0.1104.024; Example 17480: 0.50: 0.0621.823; Example 22151: 1.50: 0.0321.598; Example 3193: 3.00: 0.0391.624 surface

[0095] As shown in Table 1, under the same DLC film thickness, the tribological properties of materials with porous structures are better than those of non-porous materials. For the case where the matrix is ​​a porous polyimide matrix, the tribological properties of the material gradually improve with the increase of DLC film thickness under the condition of pores; however, they begin to deteriorate after the DLC film thickness exceeds 1.5 μm.

[0096] Figure 2 shows the Raman spectra of PPI-DLC-1.5 obtained in Example 2 and PI-DLC-1.5 obtained in Comparative Example 4. As can be seen from Figure 2, both PPI-DLC-1.5 and PI-DLC-1.5 have Raman spectra at 1500 cm⁻¹. -1 The presence of characteristic peaks of DLC indicates that the DLC solid lubricating film was successfully deposited on the PI and PPI surfaces.

[0097] Figure 3 is a cross-sectional scanning electron microscope image of PPI-DLC-1.5 obtained in Example 2. As can be seen from Figure 3, a DLC solid lubricating film with a thickness of 1.5 μm is deposited on the surface of PPI.

[0098] The pore size distribution and mercury ingress / egress curves of the PPI-DLC-1.5 obtained in Example 2 were tested using a mercury porosimeter. The results are shown in Figures 4 and 5. Figure 4 shows the pore size distribution of the PPI-DLC-1.5 obtained in Example 2, and Figure 5 shows the mercury ingress / egress curves of the PPI-DLC-1.5 obtained in Example 2. It can be seen from Figures 4 and 5 that the deposition of DLC does not cause pore blockage in the PPI.

[0099] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A porous oil-containing polymer material, characterized in that, The porous oil-containing polymer material comprises a porous polymer matrix, a solid lubricating film deposited on the porous polymer matrix, and a liquid lubricating oil stored within the pores of the porous polymer matrix to which the solid lubricating film is deposited; the solid lubricating film is made of diamond-like carbon; the porous polymer matrix is ​​made of polyimide; the porous polymer matrix has a pore size of 2 μm and a porosity of 15%; the solid lubricating film has a thickness of 1.5 μm; and the liquid lubricating oil is PAO10. The preparation method of the porous oil-containing polymer material includes the following steps: providing a porous polymer matrix; depositing a solid lubricating film on the porous polymer matrix... A lubricating film is deposited to obtain a porous polymer matrix with a solid lubricating film deposited on it. The porous polymer matrix with the solid lubricating film deposited on it is then impregnated in liquid lubricating oil to obtain the porous oil-containing polymer material. The impregnation temperature is 80°C, the time is 72 hours, and the impregnation is carried out in a vacuum environment. The preparation method of the porous polymer matrix includes the following steps: hot pressing polyimide powder to obtain the porous polymer matrix. The hot pressing temperature is 360°C, the pressure is 12 MPa, and the hot pressing time is 1 hour. The deposition method is plasma-assisted chemical vapor deposition.

2. The method for preparing the porous oil-containing polymer material according to claim 1, characterized in that, Includes the following steps: A porous polymer matrix is ​​provided; a solid lubricating film is deposited on the porous polymer matrix to obtain a porous polymer matrix with a solid lubricating film deposited thereon; the porous polymer matrix with the solid lubricating film deposited thereon is then impregnated in liquid lubricating oil to obtain the porous oil-containing polymer material; the preparation method of the porous polymer matrix includes the following steps: hot pressing polyimide powder to obtain the porous polymer matrix; the hot pressing temperature is 360°C, the pressure is 12 MPa, and the hot pressing time is 1 h; the deposition method is plasma-assisted chemical vapor deposition; the impregnation temperature is 80°C, the time is 72 h, and the impregnation is carried out in a vacuum environment.

3. The application of the porous oil-containing polymer material according to claim 1 or the porous oil-containing polymer material prepared by the preparation method according to claim 2 in the field of lubrication.

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