Special polytetrafluoroethylene-filled sealing sheet for shaft seal of automobile air conditioner compressor as well as preparation and application of polytetrafluoroethylene-filled sealing sheet

Abstract

The invention relates to the technical field of sealing materials, in particular to a polytetrafluoroethylene-filled sealing piece special for a shaft seal of an automobile air conditioner compressor and preparation and application of the polytetrafluoroethylene-filled sealing piece. The invention provides a special filled polytetrafluoroethylene sealing fin for a shaft seal of an automobile air conditioner compressor, and the filled polytetrafluoroethylene sealing fin is prepared from the following raw materials in parts by weight: modified polytetrafluoroethylene micro powder, polyphenyl sulfone and molybdenum disulfide fine powder. The polytetrafluoroethylene-filled sealing fin provided by the invention has various technical characteristics of wear resistance, self-lubrication, corrosion resistance, aging resistance, high and low temperature resistance, creep resistance and the like. The sealing piece can meet the use requirement of a shaft seal of the automobile air conditioner compressor, the leakage rate of Freon is reduced while the sealing performance is guaranteed, the sealing piece can stably work at high temperature / low temperature for a long time, the friction coefficient is low, abrasion to a main shaft of the air conditioner compressor can be reduced, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of sealing materials, and in particular to a filled polytetrafluoroethylene sealing sheet specially used for shaft seal of an automobile air-conditioning compressor, and preparation and application thereof. Background Art

[0002] The vehicle air conditioning system is one of the indispensable and important systems of modern automobiles. It is not only responsible for adjusting the cabin temperature and providing passengers with a comfortable riding environment, but also for circulating cooling of the vehicle's power system, which has an important impact on the safety and driving experience of the vehicle. One of the core components of the vehicle air conditioning system is the air conditioning compressor, which is the power source of the entire refrigeration cycle system and is responsible for the compression and transportation of the refrigerant. The use environment of the seal of the automobile air conditioning compressor is harsh. It needs to maintain a soft texture in an ultra-low temperature environment for a long time and seal normally under high pressure conditions. It also needs to have a certain friction resistance and self-lubricating ability to ensure the normal operation of the compressor. This leads to the inability of traditional rubber sealing materials to meet the requirements. To solve this problem, people choose polytetrafluoroethylene (PTFE), known as the "King of Plastics", as a sealing material. Polytetrafluoroethylene has excellent self-lubrication, corrosion resistance, and high and low temperature resistance, but it also has the defects of low hardness, easy creep, and poor friction resistance.

[0003] In order to solve the above defects of polytetrafluoroethylene sealing materials, fillers can be added to improve these shortcomings to meet the application requirements in the field of mechanical seals and friction. Commonly used inorganic fillers are mainly glass fiber, carbon fiber, graphite, molybdenum disulfide, bronze powder, etc. However, in actual use, it is found that inorganic fillers are poorly combined with polytetrafluoroethylene, and are easy to fall off during friction and wear, resulting in poor wear resistance, easy damage to the dual, and poor mechanical processing performance, which limits its application under extremely harsh working conditions.

[0004] With the advancement of automotive air-conditioning systems and changes in market demand, the stability and quality requirements for vehicle air-conditioning compressors are becoming increasingly higher. Therefore, a new type of polytetrafluoroethylene sealing material is needed to enable the prepared polytetrafluoroethylene sealing sheet to achieve low temperature resistance and high pressure resistance while having excellent wear resistance and maintaining a low friction coefficient. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a new type of polytetrafluoroethylene sealing material so that the prepared polytetrafluoroethylene sealing sheet can achieve low temperature resistance and high pressure resistance while having excellent wear resistance and maintaining a low friction coefficient.

[0006] Based on the above purpose, the present invention provides a filled polytetrafluoroethylene sealing sheet specially used for automobile air-conditioning compressor shaft seal. The raw materials for preparing the filled polytetrafluoroethylene sealing sheet include, by weight: 75 to 80 parts of modified polytetrafluoroethylene powder, 10 to 15 parts of polyphenylsulfone, and 5 to 10 parts of molybdenum disulfide fine powder.

[0007] The present application uses modified polytetrafluoroethylene micropowder as the source of polytetrafluoroethylene resin, which has a smaller average particle size and has better tensile properties, creep resistance, higher dielectric strength and is easier to process secondary than traditional polytetrafluoroethylene resin.

[0008] This application uses molybdenum disulfide (MoS 2 ) As a filler source, molybdenum disulfide fine powder is a layered inorganic compound with self-lubricating properties and high mechanical strength. The layered structure of molybdenum disulfide fine powder makes its intermolecular interaction force weak, so it is easy to disperse in the modified polytetrafluoroethylene micropowder matrix to form a uniform mixture; this physical mixing can improve the surface structure of the sealing material and enhance the hardness and wear resistance of the sealing material.

[0009] This application uses high temperature resistant polyphenylsulfone (PPSU) as the filler source. High temperature resistant polyphenylsulfone is a high performance polymer with a high glass transition temperature, high hardness and good thermal stability. It has a low thermal expansion coefficient and strong creep resistance. There is no physical and chemical change during the PTFE sintering process, which is very suitable for filling and reinforcing PTFE materials. It can replace conventional fillers (such as carbon fiber, graphite, glass fiber, etc.) as organic fillers in polytetrafluoroethylene compounds.

[0010] The new polytetrafluoroethylene sealing material enables the prepared polytetrafluoroethylene sealing sheet to achieve low temperature resistance and high pressure resistance, while having excellent wear resistance and maintaining a low friction coefficient. It can ensure the sealing stability of the automobile air-conditioning compressor; at the same time, because the sealing sheet has a low friction coefficient, while ensuring the sealing of the transmission shaft, it reduces the friction with the transmission shaft, avoiding the occurrence of adverse conditions such as abnormal high temperature and wear of the transmission shaft.

[0011] Preferably, the modified polytetrafluoroethylene powder is prepared by suspension polymerization and crushing of tetrafluoroethylene, and has an average particle size of 20 to 40 μm.

[0012] More preferably, the average particle size of the modified polytetrafluoroethylene powder is 20 to 30 μm.

[0013] More preferably, the average particle size of the modified polytetrafluoroethylene powder is 25 to 30 μm.

[0014] Preferably, the average particle size of the molybdenum disulfide fine powder is 1 to 10 μm.

[0015] More preferably, the average particle size of the molybdenum disulfide fine powder is 1 to 5 μm.

[0016] More preferably, the average particle size of the molybdenum disulfide fine powder is 2 to 3 μm.

[0017] Preferably, the polyphenylsulfone resin has a glass transition temperature of 330 to 360° C. and an average particle size of 15 to 30 μm.

[0018] More preferably, the polyphenylsulfone resin has a glass transition temperature of 360° C. and an average particle size of 20 μm.

[0019] The present invention also provides a method for preparing a filled polytetrafluoroethylene sealing sheet dedicated to a shaft seal of an automobile air-conditioning compressor, comprising the following steps:

[0020] S1. After pre-drying the polyphenylsulfone to remove moisture, it is dried again for later use; the molybdenum disulfide fine powder is sieved, pounded and fluffed to remove impurities and then set aside;

[0021] S2. The polyphenylsulfone, molybdenum disulfide powder and modified polytetrafluoroethylene powder treated in S1 are mixed to obtain a mixture;

[0022] S3. The mixture in S2 is added to the mold and cold pressed to obtain a preform blank;

[0023] S4. Sinter the preform blank in S3 at 360-380° C., cool it, and then machine it to obtain a filled polytetrafluoroethylene sealing sheet.

[0024] The present invention obtains a desired shape by mechanically processing the preform blank after sintering and cooling, which can meet the needs of various scenarios.

[0025] Preferably, in S1, the secondary drying temperature is 120-150° C., and the secondary drying treatment time is 1-2 hours.

[0026] Further preferably, in S1, the secondary drying temperature is 150° C., and the secondary drying treatment time is 2 hours.

[0027] Preferably, in S2, the mixing method is: mixing evenly at 20-30°C and 1500-1800 r / min.

[0028] Further preferably, the filled polytetrafluoroethylene sealing material is mixed uniformly at 25° C. and 1500 r / min before being pressed into shape.

[0029] Preferably, in S3, the cold press forming process is: first pressurizing to 1-3 MPa at a pressure increasing rate of 3-5 mm / s, maintaining the pressure for 2-5 seconds, and then pressurizing to 6-10 MPa, maintaining the pressure for 30-120 seconds.

[0030] Preferably, the sintering process is: heating from room temperature to 280-300°C at 1-3°C / min and keeping warm for 1-2h, then heating to 360-380°C at 1-3°C / min and keeping warm for 1-3h, cooling to 200-250°C at 0.6-0.8°C / min and then heating to 360-380°C at 1-3°C / min and keeping warm for 1-3h.

[0031] Further preferably, the sintering process is: heating from room temperature to 280-300°C at 1°C / min and keeping warm for 1-2h, then heating to 360-370°C at 1°C / min and keeping warm for 2h, cooling to 200-250°C at 0.6°C / min and then heating to 360-370°C at 2°C / min and keeping warm for 3h.

[0032] Further preferably, the sintering process is: heating from room temperature to 300°C at 1°C / min and keeping it for 2h, then heating to 365°C at 1°C / min and keeping it for 2h, cooling to 200°C at 0.6°C / min and then heating to 365°C at 2°C / min and keeping it for 3h.

[0033] Sintering is an important control link in the production of polytetrafluoroethylene products. It will fundamentally change the performance of PTFE. Sintering means heating the preform (the blank after cold pressing) to above the melting point of polytetrafluoroethylene crystal 327℃ and keeping it at this temperature for a certain period of time, so that the polymer molecules gradually change from amorphous to amorphous, and the dispersed single resin particles melt and bond into a continuous whole through mutual diffusion. At this time, the preform becomes a transparent colloid. After cooling, the polymer molecules gradually change from amorphous to crystalline, and the preform becomes a solid opaque product. For PTFE materials modified with PPSU, the sintering process must be strictly controlled to ensure that the requirements of polytetrafluoroethylene sintering and polyphenylsulfone melting are met at the same time.

[0034] Preferably, the cooling process is: cooling to 330-350°C at 0.6-0.8°C / min and keeping warm for 1-3h, cooling to 300-330°C at 0.6-0.8°C / min and keeping warm for 1-3h, then cooling to room temperature at 0.6-0.8°C / min, heating from room temperature to 200-220°C at 1-3°C / min and keeping warm for 1-2h, and cooling to room temperature at 0.6-0.8°C / min.

[0035] Further preferably, the cooling process is: cooling to 340-350°C at 0.6°C / min and keeping warm for 1-2h, cooling to 300-310°C at 0.6°C / min and keeping warm for 1-3h, then cooling to room temperature at 0.6°C / min, heating from room temperature to 200-220°C at 2°C / min and keeping warm for 1-2h, and cooling to room temperature at 0.6°C / min.

[0036] Further preferably, the cooling process is: cooling to 350°C at 0.6°C / min and keeping warm for 1 hour, cooling to 300°C at 0.6°C / min and keeping warm for 1 hour, then cooling to room temperature at 0.6°C / min, heating from room temperature to 200°C at 2°C / min and keeping warm for 1 hour, and cooling to room temperature at 0.6°C / min.

[0037] The present application utilizes a special sintering process to obtain a preform filled with polytetrafluoroethylene sealing sheets. Appropriate sintering process conditions play a decisive role in the final performance of the product, such as density, hardness, air permeability and mechanical properties. This process can ensure the integrity of the preform during sintering and improve the stability of the internal structure; at the same time, a combination of gradient cooling and temperature recovery cooling is used during the cooling stage to help reduce the internal stress of the preform and extend the service life of the polytetrafluoroethylene sealing sheet.

[0038] The present invention also provides the use of the filled polytetrafluoroethylene sealing sheet or the filled polytetrafluoroethylene sealing sheet prepared by the preparation method in the shaft seal of an automobile air-conditioning compressor.

[0039] The filled polytetrafluoroethylene sealing sheet prepared in the present application has technical characteristics such as wear resistance, self-lubrication, corrosion resistance, aging resistance, high and low temperature resistance, and creep resistance, and can be used for shaft seals of various types of automobile air-conditioning compressors.

[0040] Therefore, the present invention has the following beneficial effects:

[0041] (1) The present invention provides a filled polytetrafluoroethylene sealing sheet having multiple technical characteristics such as wear resistance, self-lubrication, corrosion resistance, aging resistance, high and low temperature resistance, and creep resistance; while achieving low temperature resistance and high pressure resistance, it has excellent wear resistance and maintains a low friction coefficient, and can meet the sealing requirements of automobile air-conditioning compressors.

[0042] (2) The present invention utilizes a special sintering and cooling process to prepare a sealing sheet with a stable internal structure and a long service life, providing ideas for the preparation of other sealing materials.

[0043] (3) The filled polytetrafluoroethylene sealing sheet prepared by the present invention can be used as a shaft seal for an automobile air-conditioning compressor, thereby helping to improve the stability and quality of the vehicle air-conditioning compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a molding process flow chart of the present invention. DETAILED DESCRIPTION

[0045] The present invention is further described below in conjunction with specific embodiments. Those of ordinary skill in the art will be able to implement the present invention based on these descriptions. In addition, the embodiments of the present invention involved in the following description are generally only embodiments of a part of the present invention, rather than all embodiments. Therefore, based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work should fall within the scope of protection of the present invention.

[0046] [Example]

[0047] The sources and properties of the raw materials used in the specific implementation of the present invention are as follows: modified polytetrafluoroethylene powder, 3M TM Dyneon TM TFM TM Modified polytetrafluoroethylene powder TFM 1700, with an average particle size of 28 μm, was purchased from 3M Company of the United States; polyphenylsulfone, polyphenylsulfone resin, with an average particle size of 20 μm, was purchased from Matt Plastics; molybdenum disulfide fine powder, with an average particle size of 2 μm, was purchased from DAIZO Co., Ltd. of Japan; polyimide, p84 model polyimide, with an average particle size of 30 μm, was purchased from Evonik Industries of Germany; polyphenyl ester, with an average particle size of 28 μm, was purchased from Zhonglan Chenguang Chemical Research Institute Plastic Company; carbon fiber, with an average particle size of 7 μm, was purchased from Qingdao Yuanhui Composite Materials Co., Ltd.; glass fiber, with an average particle size of 25 μm, was purchased from Nanjing Fiberglass Research Institute.

[0048] Example 1

[0049] S1. After pre-drying the polyphenylsulfone to remove moisture, dry it at 150°C for 2 hours and set it aside; sieve and pound the molybdenum disulfide fine powder to loosen and remove impurities and set it aside. After completing the pre-treatment of the material, proceed to the subsequent operations of S2 to S5.

[0050] S2. In parts by weight, weigh 77 parts of modified polytetrafluoroethylene powder TFM 1700 (average particle size 28 μm), 13 parts of polyphenylsulfone (glass transition temperature 360°C, average particle size 20 μm), and 6 parts of molybdenum disulfide fine powder with an average particle size of 2 μm, and mix them evenly at a temperature of 25°C using a high-speed stirrer at a speed of 1500 r / min to obtain a filled polytetrafluoroethylene mixture.

[0051] S3. The filled polytetrafluoroethylene mixture mixed in S2 is pressurized to 3 MPa at a pressure increase rate of 5 mm / s, maintained at pressure for 3 seconds, and then pressurized to 10 MPa, maintained at pressure for 100 seconds to obtain a preform blank.

[0052] S4. Sinter the preform blank obtained in S3: A, heat from room temperature to 300°C at 1°C / min and keep warm for 2h; B, heat to 365°C at 1°C / min and keep warm for 2h; C, cool to 200°C at 0.6°C / min and then heat to 365°C at 2°C / min and keep warm for 3h.

[0053] Then cool down: A, cool down to 350℃ at 0.6℃ / min and keep it for 1h; B, cool down to 300℃ at 0.6℃ / min and keep it for 1h; C, then cool down to room temperature at 0.6℃ / min, heat up from room temperature to 200℃ at 2℃ / min and keep it for 1h, and cool down to room temperature at 0.6℃ / min. The sintered and cooled preform blank is obtained.

[0054] S5. Turn the sintered and cooled preform blank obtained in S4 into a polytetrafluoroethylene-filled sealing sheet.

[0055] Example 2

[0056] This example is basically the same as Example 1, except that the raw materials in Table 1 are used for preparation.

[0057] Comparative Examples 1 / 2 / 3 / 4

[0058] This comparative example is basically the same as Example 1, except that the raw materials in Table 1 are used for preparation.

[0059] Table 1 Raw materials

[0060]

[0061] Example 3 / 4 / 5

[0062] This embodiment is basically the same as embodiment 1, except that the sintering process parameters in Table 2 are used for preparation.

[0063] Comparative Examples 5 / 6 / 7 / 8 / 9

[0064] This comparative example is basically the same as Example 1, except that the sintering process parameters in Table 2 are used for preparation.

[0065] Table 2 Sintering process parameters

[0066]

[0067] Note: “ / ” indicates that this reaction will not proceed

[0068] Example 6

[0069] This embodiment is basically the same as embodiment 1, except that the preparation is carried out according to the cooling process parameters in Table 3, and the temperature is finally cooled to room temperature at 0.6°C / min.

[0070] Comparative Examples 10 / 11 / 12 / 13 / 14

[0071] This comparative example is basically the same as Example 1, except that the preparation is carried out according to the cooling process parameters in Table 3, and the temperature is finally cooled to room temperature at 0.6°C / min.

[0072] Table 3 Cooling process parameters

[0073]

[0074]

[0075] Note: “ / ” indicates that this reaction will not proceed

[0076]

Performance test

[0077] The performance test standards in this section are as follows:

[0078] ① The friction performance is tested according to GB T 3960-2016 Plastic Sliding Friction and Wear Test Method, with a load of 200 N and a speed of 200 r / min;

[0079] ② Density is tested according to GB / T 1033.1-2008 Plastics - Determination of density of non-foamed plastics - Part 1: Immersion method, liquid pycnometer method and titration method;

[0080] ③ Shore hardness is measured according to GB / T 2411-2008 Plastics and hard rubber using a hardness tester to measure indentation hardness;

[0081] ④ Gasket wear test: Conduct a shaft seal dry grinding test at a speed of 2000 r / min for 30 min and evaluate according to the rating results in Table 4;

[0082] ⑤ Elongation at break GB / T1040.2006 "Determination of tensile properties of plastics Part 2, Experimental conditions for molding and extrusion of plastics";

[0083] ⑥Tensile strength GB / T1040.2006 "Determination of tensile properties of plastics Part 2, Experimental conditions for molding and extrusion of plastics";

[0084] ⑦ Wear scar width GB / T2411-2008 "Plastics and hard rubber - Determination of indentation hardness (Shore hardness) using a hardness tester".

[0085] Table 4 Wear degree concept table

[0086] Wear amount / % Corresponding level 0～30 1 30～50 2 50～70 3 70～90 4 90～100 5

[0087] 1. Influence of raw material selection

[0088] The performance tests were conducted on the corresponding filled polytetrafluoroethylene sealing sheets prepared in Examples 1 to 2 and Comparative Examples 1 to 4. The results are shown in Table 5.

[0089] Table 5 Performance comparison Table 1

[0090]

[0091] It can be seen from Table 5 that high temperature resistant polyphenylsulfone can replace conventional fillers (carbon fiber, glass fiber) as organic fillers in polytetrafluoroethylene compounds; and the polytetrafluoroethylene sheet with polyphenylsulfone as organic filler shows better performance, with lower friction coefficient and higher elongation at break, less wear, and helps to extend the service life of the polytetrafluoroethylene sheet.

[0092] 2. Influence of sintering process parameters

[0093] The performance tests were conducted on the corresponding filled polytetrafluoroethylene sealing sheets prepared in Examples 1, 3 to 5 and Comparative Examples 5 to 9. The results are shown in Table 6.

[0094] Table 6 Performance comparison Table 2

[0095]

[0096]

[0097] It can be seen from Table 6 that only under the specific sintering process of the present invention can a PTFE sheet with balanced performance in all directions be obtained, and each stage of sintering has different degrees of influence on the performance of the PTFE sheet. Only under the multi-stage sintering specified in the present invention can a PTFE sheet with excellent performance and more suitable for air-conditioning compressor shaft seal be obtained; and the heating rate and calcination temperature also have a negative impact on the performance of the PTFE sheet.

[0098] 3. Influence of cooling process parameters

[0099] The performance tests were conducted on the corresponding filled polytetrafluoroethylene sealing sheets prepared in Example 1, Example 6 and Comparative Examples 10 to 14. The results are shown in Table 7.

[0100] Table 7 Performance comparison Table 3

[0101]

[0102] It can be seen from Table 7 that under the sintering and cooling process specified in the present invention, the integrity of the preform during sintering can be guaranteed and the stability of the internal structure can be improved; at the same time, the combination of gradient cooling and temperature recovery cooling can be used in the cooling stage to help reduce the internal stress of the preform and extend the service life of the PTFE sheet. The PTFE sheet finally obtained has excellent wear resistance and a low friction coefficient while achieving low temperature resistance and high pressure resistance, and can meet the sealing requirements of automobile air-conditioning compressors.

Claims

1. A polytetrafluoroethylene filled sealing sheet specially used for automobile air-conditioning compressor shaft seal, characterized in that: In parts by weight, the raw materials for preparing the filled polytetrafluoroethylene sealing sheet include: 75 to 80 parts of modified polytetrafluoroethylene powder, 10 to 15 parts of polyphenylsulfone, and 5 to 10 parts of molybdenum disulfide fine powder.

2. The polytetrafluoroethylene filled sealing sheet for automobile air-conditioning compressor shaft seal according to claim 1, characterized in that: The modified polytetrafluoroethylene powder is prepared by suspension polymerization and crushing of tetrafluoroethylene, and has an average particle size of 20 to 40 μm.

3. The polytetrafluoroethylene filled sealing sheet for automobile air-conditioning compressor shaft seal according to claim 1, characterized in that: The average particle size of the molybdenum disulfide fine powder is 1 to 10 μm.

4. The polytetrafluoroethylene filled sealing sheet for automobile air-conditioning compressor shaft seal as claimed in claim 1, characterized in that: The polyphenylsulfone has a glass transition temperature of 330 to 360° C. and an average particle size of 15 to 30 μm.

5. The method for preparing a polytetrafluoroethylene filled sealing sheet for automobile air-conditioning compressor shaft seal according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. After pre-drying the polyphenylsulfone to remove moisture, it is dried again for later use; the molybdenum disulfide fine powder is sieved, pounded and fluffed to remove impurities and then set aside; S2. The polyphenylsulfone, molybdenum disulfide powder and modified polytetrafluoroethylene powder treated in S1 are mixed to obtain a mixture; S3. The mixture in S2 is added to the mold and cold pressed to obtain a preform blank; S4. Sinter the preform blank in S3 at 360-380° C., cool it, and then machine it to obtain a filled polytetrafluoroethylene sealing sheet.

6. The preparation method according to claim 5, characterized in that: In S1, the secondary drying temperature is 120-150°C, and the secondary drying treatment time is 1-2h; in S2, the mixing method is: mixing evenly at 20-30°C and 1500-1800r / min.

7. The preparation method according to claim 5, characterized in that: In S3, the cold press forming process is: first pressurize to 1-3 MPa at a pressure increase rate of 3-5 mm / s, maintain the pressure for 2-5 seconds, then pressurize to 6-10 MPa, and maintain the pressure for 30-120 seconds.

8. The preparation method according to claim 5, characterized in that: In the S4, the sintering process is: heating from room temperature to 280-300°C at 1-3°C / min and keeping warm for 1-2h, then heating to 360-380°C at 1-3°C / min and keeping warm for 1-3h, cooling to 200-250°C at 0.6-0.8°C / min and then heating to 360-380°C at 1-3°C / min and keeping warm for 1-3h.

9. The preparation method according to claim 5 or 8, characterized in that: In the S4, the cooling process is: cooling to 330-350°C at 0.6-0.8°C / min and keeping warm for 1-3h, cooling to 300-330°C at 0.6-0.8°C / min and keeping warm for 1-3h, then cooling to room temperature at 0.6-0.8°C / min, heating from room temperature to 200-220°C at 1-3°C / min and keeping warm for 1-2h, and cooling to room temperature at 0.6-0.8°C / min.

10. Use of the filled polytetrafluoroethylene sealing sheet for automobile air-conditioning compressor shaft seal as claimed in any one of claims 1 to 4 or the filled polytetrafluoroethylene sealing sheet for automobile air-conditioning compressor shaft seal obtained by the preparation method as claimed in any one of claims 5 to 9 in automobile air-conditioning compressor shaft seal.

Images