Low-friction self-lubricating fabric plain bearing liner and method of manufacture
By introducing polyimide microcapsules and molybdenum-tungsten-sulfur nanosheets into the fabric liner of self-lubricating spherical bearings, a multiphase synergistic structure is formed, which solves the problem of increased friction coefficient in the prior art, achieves a balance between low friction and high load-bearing capacity, and improves self-lubricating performance and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LANZHOU INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
- Filing Date
- 2026-04-30
- Publication Date
- 2026-07-28
AI Technical Summary
While existing self-lubricating spherical plain bearings use fabric linings to increase load-bearing capacity, they also increase the coefficient of friction, affecting the bearing's operating performance and lifespan. Therefore, reducing the coefficient of friction while ensuring load-bearing capacity has become a key issue.
Polyimide microcapsules were prepared using an aqueous/oil emulsion system and combined with polydopamine-modified carboxylated carbon nanotubes and molybdenum-tungsten-sulfur. By coating the surface of fabric materials, a multiphase synergistic structure was formed, providing low-friction self-lubricating properties.
It significantly reduces the coefficient of friction of fabric gaskets, improves load-bearing capacity and service stability, achieves slow release of lubricating oil and solid lubrication, and maintains good service stability.
Smart Images
Figure CN122467463A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of self-lubricating materials technology, and more specifically, this invention relates to a low-friction self-lubricating fabric spherical bearing liner and its preparation method. Background Technology
[0002] Self-lubricating materials play a crucial role in key components of high-reliability equipment such as aerospace equipment. Among them, self-lubricating spherical plain bearings, due to their compact structure, reliable operation, maintenance-free operation, and lack of external lubrication, exhibit significant advantages under complex operating conditions and limited lubrication, and have been widely used in aerospace and other fields. The tribological performance and service life of self-lubricating spherical plain bearings largely depend on their internal self-lubricating fabric liner. This fabric liner typically uses a fiber fabric as the matrix, introducing a load-bearing phase to enhance its load-bearing capacity and operational stability. However, in existing technologies, the load-bearing phase is often introduced into the fiber fabric through impregnation. While improving load-bearing capacity, this often compromises the fabric's original low-friction characteristics, leading to an increased coefficient of friction, which in turn affects the bearing's operating performance and lifespan. Therefore, how to effectively reduce the coefficient of friction and improve the overall tribological performance of the fabric liner while ensuring its load-bearing capacity has become a critical technical problem that urgently needs to be solved in the field of self-lubricating fabric liners.
[0003] Existing technologies typically involve impregnating the surface of fiber fabrics with resins such as epoxy resin, phenolic resin, and polyimide and then curing them to form a carrier phase. This coated resin material has a high coefficient of friction and poor wear resistance, requiring the addition of lubricating materials to give it self-lubricating properties, but its tribological properties are limited. Summary of the Invention
[0004] One object of the present invention is to solve at least the above-mentioned problems and / or defects, and to provide at least the advantages described below.
[0005] To achieve these and other advantages according to the present invention, the present invention provides a method for preparing a low-friction self-lubricating fabric spherical bearing liner, comprising the following steps: Step 1: Using an aqueous / oil phase emulsion system, prepare polyimide microcapsules containing lubricating oil using polyimide; Step 2: Disperse the lubricating oil-containing polyimide microcapsules in a polydopamine solution. After the reaction, filter and dry to obtain polyimide microcapsules with polydopamine-modified surface. Then, add the polydopamine-modified polyimide microcapsules to a carboxylated carbon nanotube dispersion and sonicate to obtain high-temperature resistant polyimide microcapsules. Step 3: Prepare a dispersion using high-temperature resistant polyimide microcapsules, molybdenum tungsten sulfur, polytetrafluoroethylene emulsion and defoamer. Coat the dispersion onto the surface of the fabric material and dry it. Then, heat press it to prepare a low-friction self-lubricating fabric spherical bearing liner.
[0006] Preferably, in step one, the specific method for preparing the lubricating oil-containing polyimide microcapsules includes: dissolving polyvinylpyrrolidone in deionized water to form an aqueous phase; and mixing polyimide, benzyl silicone oil, dichloromethane, and trichloromethane in a mass ratio to obtain an oil phase. The oil phase and water phase were mixed at a volume ratio of 1:1 to 1:2 and homogenized in a high-speed homogenizer at a speed of 10,000 to 20,000 rpm for 5 to 10 minutes. Then, the mixture was transferred to a water bath at 33 to 37°C and stirred at a speed of 500 to 1,000 rpm for 4 to 6 hours. After the reaction was completed, the mixture was filtered, washed, vacuum filtered and dried to obtain polyimide microcapsules containing lubricating oil with a particle size of 1 to 5 μm.
[0007] Preferably, the ratio of polyvinylpyrrolidone to deionized water is 1-4 g: 100 mL; The mass ratio of polyimide, benzyl silicone oil, dichloromethane, and trichloromethane is 1-2:1-2:14-19:1-6.
[0008] Preferably, in step one, the polyimide is a soluble polyimide, specifically a polyimide whose molecular structure contains a hexafluoroisopropyl structural unit, and the polyimide is a 6FDA-based polyimide.
[0009] Preferably, in step two, the method for preparing the polydopamine solution includes: adding dopamine and tris(hydroxymethyl)aminomethane to deionized water to prepare a polydopamine solution; the ratio of dopamine, tris(hydroxymethyl)aminomethane and deionized water is 1~4g:0.8~1.5g:1L.
[0010] Preferably, in step two, the ratio of lubricating oil-containing polyimide microcapsules to polydopamine solution is 1~2g:1L, the reaction temperature is room temperature, and the reaction time is 12~24h.
[0011] Preferably, in step two, the mass concentration of the carboxylated carbon nanotube dispersion is 0.1~1 mg / mL, and it is ultrasonically dispersed in a cell disruptor for 5~10 min with a disruption power of 180~300 W; The ratio of lubricating oil-containing polyimide microcapsules to carboxylated carbon nanotube dispersion is 1~2g:100~200mL.
[0012] Preferably, in step three, the defoamer is n-octanol, and the dosage is 1 μL to 3 μL; The mass ratio of high-temperature resistant polyimide microcapsules, molybdenum-tungsten sulfur, and polytetrafluoroethylene emulsion is 5–20:0.5–2:80–95.
[0013] Preferably, in step three, the hot pressing temperature for preparing the low-friction self-lubricating fabric spherical bearing liner is 330~350℃, and the sintering time is 6~12h.
[0014] A low-friction self-lubricating fabric spherical bearing liner is provided, wherein the low-friction self-lubricating fabric spherical bearing liner is prepared by the above-described preparation method of the low-friction self-lubricating fabric spherical bearing liner.
[0015] Preferably, the fabric material has a thickness of 0.3~0.4 mm, and the fabric weight increases by 50%~70% after coating; The fabric material is a polytetrafluoroethylene-aramid blend.
[0016] The present invention has at least the following beneficial effects: 1. This invention successfully introduces lubricating oil polyimide microcapsules into the polytetrafluoroethylene support phase, achieving solid-liquid composite self-lubrication and significantly reducing the friction coefficient of the fabric liner; 2. Molybdenum-tungsten-sulfur nanosheets enhance the load-bearing phase, effectively compensating for the insufficient load-bearing capacity of polytetrafluoroethylene and improving the load-bearing capacity and service stability of fabric pads. 3. Oil-containing polyimide microcapsules combined with molybdenum-tungsten-sulfur-bonded polytetrafluoroethylene effectively improve the adverse effects of traditional coatings on the friction performance of fiber fabrics, enabling the fabric pad to maintain good service stability under low friction conditions.
[0017] In the low-friction self-lubricating fabric spherical bearing liner prepared by this invention, polyimide microcapsules serve as a carrier for lubricating oil, enabling the slow release of lubricating oil during service and providing liquid lubrication; the polytetrafluoroethylene (PTFE) carrier phase provides a low-friction matrix; layered transition metal sulfides (molybdenum-tungsten-sulfur) play a role in load-bearing enhancement and solid lubrication under high load conditions; the polyimide microcapsules, lubricating fillers, and carrier phase form a multiphase synergistic structure on the fabric surface, thereby achieving a balance between low friction and high load-bearing capacity.
[0018] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description
[0019] Figure 1 The image shows the microstructure of the high-temperature resistant polyimide microcapsules loaded with carboxylated carbon nanotubes prepared in Example 1. Detailed Implementation
[0020] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.
[0021] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.
[0022] The preparation methods of the 6FDA-based polyimide used in each embodiment include: 10 mmol of 4,4′-(hexafluoroisopropene)phthalic anhydride (6FDA) and 10 mmol of 2,2′-di(trifluoromethyl)diaminobiphenyl were weighed separately and added to a three-necked flask. 76 g of N-methylpyrrolidone was also added, and the reaction was allowed to proceed for 24 h. Subsequently, an acetic anhydride-pyridine solution was prepared at a molar ratio of 1:0.6 (1 g of acetic anhydride and 0.48 g of pyridine). This solution was then added to the reaction mixture, and stirring was continued for another 24 h. Finally, the entire reaction mixture was slowly poured into water or ethanol to form a soluble 6FDA-based polyimide powder. Example 1 A method for preparing a low-friction self-lubricating fabric spherical bearing liner includes the following steps: Step 1: Dissolve 5g of polyvinylpyrrolidone (PVP) in 500mL of deionized water to form an aqueous phase; mix 6FDA-based polyimide, benzyl silicone oil, dichloromethane, and trichloromethane in a mass ratio of 1:1:17:3 to form an oil phase; mix the oil phase and the aqueous phase in a volume ratio of 1:2, homogenize at 10000rpm for 10min in a high-speed homogenizer, transfer to a 37℃ water bath, stir at 500rpm for 4h, and obtain polyimide microcapsules containing lubricating oil after filtration, washing, vacuum filtration, and drying.
[0023] Step 2: Prepare a polydopamine solution by adding 1g dopamine and 0.8g tris(hydroxymethyl)aminomethane to 1L of water. Redisperse 1g of lubricating oil-containing polyimide microcapsules in the polydopamine solution and stir for 24 hours. Filter and dry to obtain polydopamine-modified microcapsules. Prepare 100mL of carboxylated carbon nanotube dispersion (0.1mg / ml) and disperse for 5 minutes on a cell disruptor with a power of 180W. Add the polydopamine-modified microcapsules to the carboxylated carbon nanotube dispersion and sonicate for 180 minutes. Centrifuge to remove excess carboxylated carbon nanotubes. Repeat the above steps three times to obtain high-temperature resistant polyimide microcapsules. The microstructure of the high-temperature resistant polyimide microcapsules prepared in this example is shown in the figure. Figure 1 As shown.
[0024] Step 3: Mix 1g of high-temperature resistant polyimide microcapsules, 0.1g of molybdenum-tungsten-sulfur, and 19g of polytetrafluoroethylene (PTFE) emulsion to form a dispersion. Add 1μL of n-octanol to eliminate foam. Apply the dispersion in small amounts multiple times to the surface of the PTFE-aramid blended fabric using a brush and dry. Transfer the coated PTFE-aramid blended fabric to a high-temperature hot press and sinter at 330℃ for 12 hours to obtain the microcapsule / PTFE / fabric composite material, i.e., a low-friction self-lubricating fabric spherical bearing liner.
[0025] After coating and sintering, the thickness of the low-friction self-lubricating fabric spherical bearing gasket is 0.520 mm, and the mass increases by 12.3 g.
[0026] Example 2 A method for preparing a low-friction self-lubricating fabric spherical bearing liner includes the following steps: Step 1: Dissolve 7.5g of polyvinylpyrrolidone (PVP) in 500mL of deionized water to form an aqueous phase; mix 6FDA-based polyimide, benzyl silicone oil, dichloromethane, and trichloromethane in a mass ratio of 1:1.5:17:3 to form an oil phase; mix the oil phase and the aqueous phase in a volume ratio of 1:1, homogenize at 20,000 rpm for 5 min in a high-speed homogenizer, transfer to a 36℃ water bath, stir at 700 rpm for 6 h, and obtain polyimide microcapsules containing lubricating oil after filtration, washing, vacuum filtration, and drying.
[0027] Step 2: Prepare a polydopamine solution by adding 2g of dopamine and 1.2g of tris(hydroxymethyl)aminomethane to 1L of water. Redisperse 1g of lubricating oil-containing polyimide microcapsules in the polydopamine solution and stir for 24 hours. Filter and dry to obtain polydopamine-modified microcapsules. Prepare 100mL of carboxylated carbon nanotube dispersion (0.2mg / ml) and disperse it on a cell disruptor (300W) for 10 minutes. Add the polydopamine-modified microcapsules to the carboxylated carbon nanotube dispersion and sonicate for 120 minutes. Centrifuge to remove excess carboxylated carbon nanotubes. Repeat the above steps three times to obtain high-temperature resistant polyimide microcapsules.
[0028] Step 3: Mix 2.5g of high-temperature resistant polyimide microcapsules, 0.2g of molybdenum-tungsten-sulfur, and 17.5g of polytetrafluoroethylene (PTFE) emulsion to form a dispersion. Add 2μL of n-octanol to eliminate foam. Apply the dispersion to the surface of the PTFE-aramid blended fabric in small amounts multiple times using a brush and dry. Transfer the coated PTFE-aramid blended fabric to a high-temperature hot press and sinter at 350℃ for 6 hours to obtain the microcapsule / PTFE / fabric composite material.
[0029] After coating and sintering, the thickness of the low-friction self-lubricating fabric spherical bearing liner is 0.522 mm, and the weight increases by 11.7 g.
[0030] Example 3 A method for preparing a low-friction self-lubricating fabric spherical bearing liner includes the following steps: Step 1: Dissolve 10g of polyvinylpyrrolidone (PVP) in 500mL of deionized water to form an aqueous phase; mix 6FDA-based polyimide, benzyl silicone oil, dichloromethane, and trichloromethane in a ratio of 1:2:18:2 to form an oil phase; mix the oil phase and the aqueous phase at a volume ratio of 1:1.5, homogenize at 12000rpm for 8min in a high-speed homogenizer, transfer to a 33℃ water bath, stir at 800rpm for 5h, and obtain polyimide microcapsules containing lubricating oil after filtration, washing, vacuum filtration, and drying.
[0031] Step 2: Prepare a polydopamine solution by adding 3g dopamine and 1.5g tris(hydroxymethyl)aminomethane to 1L of water. Redisperse 2g of lubricating oil-containing polyimide microcapsules in the polydopamine solution and stir for 24 hours. Filter and dry to obtain polydopamine-modified microcapsules. Prepare 100mL of carboxylated carbon nanotube dispersion (0.5mg / ml) and disperse on a cell disruptor at 240W for 8 minutes. Add the polydopamine-modified microcapsules to the carboxylated carbon nanotube dispersion and sonicate for 120 minutes. Centrifuge to remove excess carboxylated carbon nanotubes. Repeat the above steps three times to obtain high-temperature resistant polyimide microcapsules.
[0032] Step 3: Mix 2g of high-temperature resistant polyimide microcapsules, 0.3g of molybdenum-tungsten-sulfur, and 18g of polytetrafluoroethylene (PTFE) emulsion to form a dispersion. Add 3μL of n-octanol to eliminate foam. Apply the dispersion to the surface of the PTFE-aramid blended fabric in small amounts multiple times using a brush and dry. Transfer the coated PTFE-aramid blended fabric to a high-temperature hot press and sinter at 340℃ for 8 hours to obtain the microcapsule / PTFE / fabric composite material.
[0033] After coating and sintering, the thickness of the low-friction self-lubricating fabric spherical bearing gasket is 0.516 mm, and the weight increases by 11.9 g.
[0034] Example 4 A method for preparing a low-friction self-lubricating fabric spherical bearing liner includes the following steps: Step 1: Dissolve 20g of polyvinylpyrrolidone (PVP) in 500mL of deionized water to form an aqueous phase; mix soluble polyimide, benzyl silicone oil, dichloromethane, and trichloromethane in a ratio of 1:1.5:19:1 to form an oil phase; mix the oil phase and the aqueous phase at a volume ratio of 1:1.5, homogenize at 12000rpm for 8min in a high-speed homogenizer, transfer to a 35℃ water bath, stir at 1000rpm for 4h, and obtain polyimide microcapsules containing lubricating oil after filtration, washing, vacuum filtration, and drying.
[0035] Step 2: Prepare a polydopamine solution by adding 2g dopamine and 1.2g tris(hydroxymethyl)aminomethane to 1L of water. Redisperse 1g of lubricating oil-containing polyimide microcapsules in the polydopamine solution and stir for 18 hours. Filter and dry to obtain polydopamine-modified microcapsules. Prepare 100mL of carboxylated carbon nanotube dispersion (0.4mg / ml) and disperse it on a cell disruptor (200W power) for 10 minutes. Add the polydopamine-modified microcapsules to the carboxylated carbon nanotube dispersion and sonicate for 120 minutes. Centrifuge to remove excess carboxylated carbon nanotubes. Repeat the above steps three times to obtain high-temperature resistant polyimide microcapsules.
[0036] Step 3: Mix 4g of high-temperature resistant polyimide microcapsules, 0.1g of molybdenum-tungsten-sulfur, and 16g of polytetrafluoroethylene (PTFE) emulsion to form a dispersion. Add 1μL of n-octanol to eliminate foam. Apply the dispersion to the surface of the PTFE-aramid blended fabric in small amounts multiple times using a brush and dry. Transfer the coated PTFE-aramid blended fabric to a high-temperature hot press and sinter at 340℃ for 8 hours to obtain the microcapsule / PTFE / fabric composite material.
[0037] After coating and sintering, the thickness of the low-friction self-lubricating fabric spherical bearing liner is 0.505 mm, and the weight increases by 13.2 g.
[0038] Comparative Example 1 20g of polytetrafluoroethylene (PTFE) emulsion was added to 2μL of n-octanol to prepare a coating solution. The coating solution was applied in small amounts multiple times to the surface of the PTFE-aramid blended fabric using a brush and then dried. The coated PTFE-aramid blended fabric was transferred to a high-temperature hot press and sintered at 350℃ for 6 hours to obtain a PTFE / fabric composite material.
[0039] After coating and sintering, the thickness of the low-friction self-lubricating fabric spherical bearing liner is 0.526 mm, and the weight increases by 12.0 g.
[0040] Comparative Example 2 0.2g of molybdenum-tungsten-sulfur and 20g of polytetrafluoroethylene (PTFE) emulsion were mixed and stirred to form a dispersion. 2μL of n-octanol was added to eliminate foam. The dispersion was coated onto the surface of the PTFE-aramid blended fabric in small amounts multiple times with a brush and then dried. The coated PTFE-aramid blended fabric was transferred to a high-temperature hot press and sintered at 350℃ for 6 hours to obtain the PTFE / fabric composite material.
[0041] After coating and sintering, the thickness of the low-friction self-lubricating fabric spherical bearing liner is 0.523 mm, and the weight increases by 11.8 g.
[0042] Comparative Example 3 A method for preparing a low-friction self-lubricating fabric spherical bearing liner includes the following steps: Step 1: Dissolve 7.5g of polyvinylpyrrolidone (PVP) in 500mL of deionized water to form an aqueous phase; mix 6FDA-based polyimide, benzyl silicone oil, dichloromethane, and trichloromethane in a mass ratio of 1:1.5:17:3 to form an oil phase; mix the oil phase and the aqueous phase in a volume ratio of 1:1, homogenize at 20,000 rpm for 5 min in a high-speed homogenizer, transfer to a 36℃ water bath, stir at 700 rpm for 6 h, and obtain polyimide microcapsules containing lubricating oil after filtration, washing, vacuum filtration, and drying.
[0043] Step 2: Mix 2.5g of lubricating oil-containing polyimide microcapsules, 0.2g of molybdenum-tungsten-sulfur, and 17.5g of polytetrafluoroethylene (PTFE) emulsion to form a dispersion. Add 2μL of n-octanol to eliminate foam. Apply the dispersion in small amounts multiple times to the surface of the PTFE-aramid blended fabric using a brush and dry. Transfer the coated PTFE-aramid blended fabric to a high-temperature hot press and sinter at 350℃ for 6 hours to obtain the microcapsule / PTFE / fabric composite material.
[0044] After coating and sintering, the thickness of the low-friction self-lubricating fabric spherical bearing gasket is 0.521 mm, and the weight increases by 11.9 g.
[0045] Comparative Example 4 A method for preparing a low-friction self-lubricating fabric spherical bearing liner includes the following steps: Step 1: Dissolve 7.5g of polyvinylpyrrolidone (PVP) in 500mL of deionized water to form an aqueous phase; mix 6FDA-based polyimide, benzyl silicone oil, dichloromethane, and trichloromethane in a mass ratio of 1:1.5:17:3 to form an oil phase; mix the oil phase and the aqueous phase in a volume ratio of 1:1, homogenize at 20,000 rpm for 5 min in a high-speed homogenizer, transfer to a 36℃ water bath, stir at 700 rpm for 6 h, and obtain polyimide microcapsules containing lubricating oil after filtration, washing, vacuum filtration, and drying.
[0046] Step 2: Prepare a polydopamine solution by adding 2g of dopamine and 1.2g of tris(hydroxymethyl)aminomethane to 1L of water. Redisperse 1g of lubricating oil-containing polyimide microcapsules in the polydopamine solution and stir for 24 hours. Filter and dry to obtain polydopamine-modified microcapsules. Prepare 100mL of carboxylated carbon nanotube dispersion (0.2mg / ml) and disperse it on a cell disruptor (300W) for 10 minutes. Add the polydopamine-modified microcapsules to the carboxylated carbon nanotube dispersion and sonicate for 120 minutes. Centrifuge to remove excess carboxylated carbon nanotubes. Repeat the above steps three times to obtain high-temperature resistant polyimide microcapsules.
[0047] Step 3: Mix 2.5g of high-temperature resistant polyimide microcapsules and 17.5g of polytetrafluoroethylene (PTFE) emulsion to form a dispersion, and add 2μL of n-octanol to eliminate foam. Apply the dispersion to the surface of the PTFE-aramid blended fabric in small amounts multiple times using a brush and dry. Transfer the coated PTFE-aramid blended fabric to a high-temperature hot press and sinter at 350℃ for 6 hours to obtain the microcapsule / PTFE / fabric composite material.
[0048] After coating and sintering, the thickness of the low-friction self-lubricating fabric spherical bearing gasket is 0.515mm, and the weight increases by 12.0g.
[0049] The test conditions were: fabric composite material and steel ball were rubbed together, the test load was 5N, the rotation speed was 1cm / s, the running time was 1.0h, and the wear rate was the average of 5 tests.
[0050] Table 1. Comparison of experimental results between the examples and comparative examples. As can be seen from the table above, the low-friction self-lubricating fabric spherical bearing pads prepared by the preparation method provided by the present invention in Examples 1-4 have superior self-lubricating properties.
[0051] The number of devices and processing scale described herein are for the purpose of simplifying the description of the invention. Applications, modifications, and variations of the invention will be readily apparent to those skilled in the art.
[0052] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.
Claims
1. A method for preparing a low-friction self-lubricating fabric spherical bearing liner, characterized in that, Includes the following steps: Step 1: Using an aqueous / oil phase emulsion system, prepare polyimide microcapsules containing lubricating oil using polyimide; Step 2: Disperse the lubricating oil-containing polyimide microcapsules in a polydopamine solution. After the reaction, filter and dry to obtain polyimide microcapsules with polydopamine-modified surface. Then, add the polydopamine-modified polyimide microcapsules to a carboxylated carbon nanotube dispersion and sonicate to obtain high-temperature resistant polyimide microcapsules. Step 3: Prepare a dispersion using high-temperature resistant polyimide microcapsules, molybdenum tungsten sulfur, polytetrafluoroethylene emulsion and defoamer. Coat the dispersion onto the surface of the fabric material and dry it. Then, heat press it to prepare a low-friction self-lubricating fabric spherical bearing liner.
2. The method for preparing the low-friction self-lubricating fabric spherical bearing liner as described in claim 1, characterized in that, In step one, the specific method for preparing lubricating oil-containing polyimide microcapsules includes: dissolving polyvinylpyrrolidone in deionized water to form an aqueous phase; and mixing polyimide, benzyl silicone oil, dichloromethane, and trichloromethane in a mass ratio to obtain an oil phase. The oil phase and water phase were mixed at a volume ratio of 1:1 to 1:2 and homogenized in a high-speed homogenizer at a speed of 10,000 to 20,000 rpm for 5 to 10 minutes. Then, the mixture was transferred to a water bath at 33 to 37°C and stirred at a speed of 500 to 1,000 rpm for 4 to 6 hours. After the reaction was completed, the mixture was filtered, washed, vacuum filtered and dried to obtain polyimide microcapsules containing lubricating oil with a particle size of 1 to 5 μm.
3. The method for preparing the low-friction self-lubricating fabric spherical bearing liner as described in claim 2, characterized in that, The ratio of polyvinylpyrrolidone to deionized water is 1~4g:100mL; The mass ratio of polyimide, benzyl silicone oil, dichloromethane, and trichloromethane is 1-2:1-2:14-19:1-6.
4. The method for preparing the low-friction self-lubricating fabric spherical bearing liner as described in claim 1, characterized in that, In step one, the polyimide is a soluble polyimide, specifically a polyimide whose molecular structure contains a hexafluoroisopropyl structural unit, and the polyimide is a 6FDA-based polyimide.
5. The method for preparing the low-friction self-lubricating fabric spherical bearing liner as described in claim 1, characterized in that, In step two, the preparation method of the polydopamine solution includes: adding dopamine and tris(hydroxymethyl)aminomethane to deionized water to prepare a polydopamine solution; the ratio of dopamine, tris(hydroxymethyl)aminomethane and deionized water is 1~4g:0.8~1.5g:1L.
6. The method for preparing the low-friction self-lubricating fabric spherical bearing liner as described in claim 1, characterized in that, In step two, the ratio of lubricating oil-containing polyimide microcapsules to polydopamine solution is 1~2g:1L, the reaction temperature is room temperature, and the reaction time is 12~24h.
7. The method for preparing the low-friction self-lubricating fabric spherical bearing liner as described in claim 1, characterized in that, In step two, the mass concentration of the carboxylated carbon nanotube dispersion is 0.1~1mg / mL, and it is ultrasonically dispersed in a cell disruptor for 5~10min with a disruption power of 180~300W; the ratio of lubricating oil-containing polyimide microcapsules to carboxylated carbon nanotube dispersion is 1~2g:100~200mL.
8. The method for preparing the low-friction self-lubricating fabric spherical bearing liner as described in claim 1, characterized in that, In step three, the defoamer is n-octanol, and the dosage is 1μL~3μL; The mass ratio of high-temperature resistant polyimide microcapsules, molybdenum-tungsten sulfur, and polytetrafluoroethylene emulsion is 5–20:0.5–2:80–95.
9. The method for preparing the low-friction self-lubricating fabric spherical bearing liner as described in claim 1, characterized in that, In step three, the hot pressing temperature for preparing the low-friction self-lubricating fabric spherical bearing liner is 330~350℃, and the sintering time is 6~12h.
10. A low-friction self-lubricating fabric spherical bearing liner, characterized in that, The low-friction self-lubricating fabric spherical bearing pad is prepared by the preparation method of the low-friction self-lubricating fabric spherical bearing pad according to any one of claims 1-8; The fabric material has a thickness of 0.3~0.4mm, and the fabric weight increases by 50%~70% after coating; The fabric material is a polytetrafluoroethylene-aramid blend.