A polymer fiber composite bearing shell and a method for manufacturing the same

Abstract

The application discloses a kind of polymer fiber composite material bearing bush and preparation method thereof, comprising the following steps: (1) preparation prepolymer (2) preparation raw material liquid;(3) first preheating drum spinning receiver 30min under 70~85 ℃, smears release agent, then the fiber spinning solution is prepared spinning fiber by nozzle on the surface of metal drum receiver rotating at constant speed using electrospinning process, simultaneously, the prepared prepolymer and crosslinking agent are respectively quantitatively and constantly injected to fiber drum by nozzle, after 20~30min, stop operation, after 2~3 hours of heat preservation, remove metal drum, finally it is placed in 100~115 ℃ oven after curing 10~24h, demoulding, and the fiber composite material bearing bush is prepared.The application uses the above-mentioned one kind of polymer fiber composite material bearing bush and preparation method thereof, improves the performance of fiber composite material bearing bush.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high polymer composite material, in particular to a high polymer fiber composite material bearing bush and a preparation method thereof. BACKGROUND

[0002] High polymer bearing has the advantages of high elasticity, long service life, small noise and excellent friction characteristics, and is widely used in many fields such as ships, water pumps and water turbines. In order to improve the load capacity and comprehensive mechanical properties of high polymer bearing, fiber composite high polymer material is an effective means. However, in the conventional fiber polymer blending process, the fiber is aggregated, oversized, unevenly dispersed, and the modulus is increased but the elasticity is decreased, and many process problems occur, which leads to that the fiber modified polymer technology has not been effectively applied to the production of high-performance high polymer composite material bearing bush. If a micro-nano sized polymer fiber can be prepared and uniformly distributed in the polymer, the fiber composite material bearing bush prepared in this way will significantly improve the comprehensive properties of the existing bearing bush material. SUMMARY

[0003] The purpose of the present application is to provide a high polymer fiber composite material bearing bush and a preparation method thereof, to improve the load capacity and comprehensive mechanical properties of high polymer bearing bush, and to solve the process problems of fiber size being too large, uneven dispersion, and easy formation of fiber aggregation.

[0004] To achieve the above-mentioned purpose, the present application provides a high polymer fiber composite material bearing bush and a preparation method thereof, comprising the following steps:

[0005] (1) preparing a prepolymer

[0006] Mixing the low molecular polyol after negative pressure dehydration with diisocyanate 100:(20-50) uniformly, putting into a three-necked reactor, and putting the three-necked reactor into a 75-95℃ oil bath, stirring for 2-3 hours under the condition of nitrogen protection, to prepare the prepolymer;

[0007] (2) preparing a raw material solution

[0008] A certain amount of polymer raw material is dissolved in an organic solvent as a spinning solute, heated and stirred to form a translucent spinning solution, and the mass fraction of the spinning solution is 5-30wt%;

[0009] (3) preparing a fiber composite material bearing bush

[0010] The device comprises a fiber spinning nozzle, a prepolymer nozzle, a crosslinking agent nozzle and a drum spinning receiver.

[0011] Firstly, the drum spinning receiver is preheated at 70-85℃ for 30min, and then the release agent is applied, and then the fiber spinning solution is prepared by electrospinning process through the nozzle on the surface of the metal drum receiver rotating at a constant speed, at the same time, the prepared prepolymer and crosslinking agent are quantitatively and constantly injected through the nozzle, after 20-30min, the operation is stopped, and after 2-3 hours of heat preservation, the metal drum is removed, and finally it is placed in a 105-115℃ oven for post-curing for 10-24h, demolding, and the fiber composite bearing is prepared.

[0012] Preferably, the low molecular polyol in step (1) is one or a mixture of polytetrahydrofuran ether polyol, polyethylene oxide polyol, polypropylene glycol, polypropylene oxide triol, polycaprolactone polyol, polycarbonate polyol, polyethylene glycol adipate diol, polyphthalic acid diethylene glycol diol, polyadipic acid-3-methyl-1,5 pentanediol.

[0013] The diisocyanate is one or a mixture of hexamethylene diisocyanate, 4,4'-dicyclohexyl methane diisocyanate, liquefied MDI, toluene diisocyanate, 1,5-naphthalene diisocyanate, benzene dimethylene diisocyanate, dimethyl diphenyl methane diisocyanate, isoflurone diisocyanate.

[0014] Preferably, the prepolymer in step (1) is an epoxy resin, which is one or a mixture of bisphenol A type epoxy resin, halogenated bisphenol A type epoxy resin, bisphenol S epoxy resin, bisphenol F epoxy resin, aliphatic epoxy resin, acrylic epoxy resin, polybutadiene epoxy resin, silicone epoxy resin, unsaturated epoxy resin, ethylene glycol epoxy resin, glycerol epoxy resin, amine-based epoxy resin.

[0015] Preferably, in step (2), the polymer raw material is one or a mixture of vinylidene fluoride, nylon 6, polyimide, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, polystyrene, polyvinyl alcohol polymer.

[0016] Preferably, in step (3), the crosslinking agent is one or a mixture of 1,4-butanediol, ethylene glycol, 1,6-hexanediol, hydroquinone dihydroxyethyl ether, glycerol, diethylaminoethanol, 3,3'-dichloro-4,4-diphenyl methane diamine, 4,4'-methylene-bis-(3-chloro-2,6-diethyl benzene amine), 4,4-methylene bis(2,6-diethyl) aniline, 3,5-dimethylthio toluene diamine, toluene diamine, dicumyl peroxide, benzoyl peroxide, di-t-butyl peroxide, ethylenediamine, primary amine polyether amine, aziridine, hydroxyl-terminated polypropylene oxide ether crosslinking agent.

[0017] Preferably, in step (3), the voltage of the electrospinning process is 2-60kV.

[0018] Preferably, in step (3), the receiving distance of the electrospinning process is 5-30 cm.

[0019] Preferably, in step (3), the advancing speed of the fiber spinning solution is 0.05-1.5 mm / min, the advancing speed of the prepolymer is 0.05-1.5 mm / min, and the advancing speed of the crosslinking agent is 0.1-15 mm / min.

[0020] Preferably, in step (3), the drum spinning receiver is further connected with a heating device, and the heating temperature of the drum spinning receiver is 75-100℃.

[0021] The beneficial effects of the present application are as follows:

[0022] (1) In the process of electrospinning, the fiber spinning solution first forms micro-nano-sized fibers on the spinning receiver, while the spinning is in progress, the prepolymer and the crosslinking agent are injected onto the receiving drum, and under the condition of heating, crosslinking chemical reaction occurs, forming a fiber / elastomer composite bearing material, and the fiber and the elastomer are formed together, achieving molecular-level blending, significantly improving the strength of the fiber bearing.

[0023] (2) The method of the present application is simple, easy to operate, does not need to introduce other complex molds and processing technology, and does not need to go through complicated chemical methods, and is suitable for mass production.

[0024] (3) The present application not only solves the problem that part of the polyurethane elastomer products does not meet the mechanical properties in the production process, but also is simple and easy to operate, improves the qualified rate of polyurethane elastomer products, and saves the cost.

[0025] The technical solutions of the present application will be further described in detail below through the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is an apparatus diagram of the process flow of the high polymer fiber composite bearing and the preparation method thereof according to an embodiment of the present application;

[0027] Figure 2 is a time and friction coefficient relationship diagram of the high polymer fiber composite bearing and the preparation method thereof according to embodiment 1 of the present application;

[0028] Figure 3 is a scanning electron microscope diagram of the fiber morphology of the high polymer fiber composite bearing and the preparation method thereof according to embodiment 1 of the present application.

[0029] Reference signs:

[0030] 1, fiber spinning nozzle; 2, prepolymer nozzle; 3, crosslinking agent nozzle; 4, spinning receiver. Detailed Implementation

[0031] The present invention will be further described below with reference to the embodiments. Unless otherwise specified, all chemicals and reagents used in the embodiments are commercially available.

[0032] Example 1

[0033] (1) Preparation of prepolymer

[0034] 100g of polytetrahydrofuran ether diol (Mn=2000) and 23.72g of toluene diisocyanate were mixed evenly after being dehydrated under negative pressure and placed into a three-necked reactor. The three-necked reactor was then placed in an oil bath at 85°C and stirred for 3 hours under nitrogen protection to prepare the prepolymer.

[0035] (2) Preparation of raw material solution

[0036] Dissolve 5g of polyvinylidene fluoride (PVDF) in 47.47ml of DMF organic solvent to prepare a PVDF solution, which will be used as a fiber spinning solution; put 10g of the above-mentioned self-made prepolymer directly into a syringe for later use; heat 2.8g of 3,3'-dichloro-4,4-diphenylmethanediamine (MOCA) to 120℃ to melt for later use.

[0037] (3) Preparation of fiber composite bearings

[0038] Use such as Figure 1 The electrospinning apparatus shown first preheats the roller spinning receiver at 85°C for 30 minutes, applies a release agent, and then uses electrospinning to prepare spun fibers by passing the PVDF fiber spinning solution prepared above through the surface of a metal roller receiver rotating at a constant speed of 100 r / min. The electrospinning process is as follows: voltage 15 kV, receiving distance 15 cm, and spinning solution propulsion speed 0.05 mm / min.

[0039] Simultaneously, 10g of the prepolymer and 2.8g of MOCA prepared above were injected into a fiber roller through a nozzle. The fiber roller temperature was 85℃, and the rotation speed was a constant 100r / min. After 25 minutes, the operation was stopped, and the roller was kept at this temperature for 2 hours. The metal roller was then removed, and the roller was finally placed in an oven at 115℃ for 18 hours to cure. After demolding, the fiber composite bearing was obtained. The prepolymer was propelled at a speed of 1.0mm / min, and the crosslinking agent was propelled at a speed of 10mm / min.

[0040] Its tensile strength, elongation at break and coefficient of friction shall be tested in accordance with the GB / T 528-2009 standard or method.

[0041] Example 2

[0042] (1) Preparation of prepolymer

[0043] After 100 g of polycaprolactone polyol (Mn = 2000) was dehydrated under negative pressure, 23.72 g of toluene diisocyanate was mixed uniformly, placed in a three-necked reactor, and the three-necked reactor was placed in an 85°C oil bath, stirred for 3 hours under nitrogen protection, to prepare a prepolymer.

[0044] (2) Preparation of raw material solution

[0045] 10 g of polymethyl methacrylate (PMMA) was dissolved in 24.61 ml of DMF organic solvent to prepare a PMMA solution as a spinning solution; 10 g of the above self-prepared prepolymer was directly placed in a syringe for standby; 2.8 g of 3,3'-dichloro-4,4-diphenyl methane diamine (MOCA) was heated to 120°C for melting standby.

[0046] (3) Preparation of fiber composite bearing

[0047] An electrospinning device as shown in Figure 1 was used. First, the drum spinning receiver was preheated at 85°C for 30 min, and then the PMMA fiber spinning solution prepared above was spun on the surface of the metal drum receiver rotating at a constant speed of 100 r / min through the nozzle by the electrospinning process. The electrospinning process was: voltage 20 kV, receiving distance 15 cm, and the advancing speed of the fiber spinning solution was 0.05 mm / min.

[0048] At the same time, 10 g of the prepolymer and 2.8 g of MOCA prepared above were injected through the nozzle to the fiber drum, the fiber drum temperature was 85°C, and the rotating speed was constant 100 r / min. After 25 min, the operation was stopped, and after 2 hours of heat preservation, the metal drum was removed, and finally it was placed in a 115°C oven for post-curing for 10 h, demolding, to prepare a fiber composite bearing. The advancing speed of the prepolymer was 1.0 mm / min, and the advancing speed of the crosslinking agent was 10 mm / min.

[0049] The test method was the same as in Example 1.

[0050] Example 3

[0051] (1) Preparation of prepolymer

[0052] After 100 g of polycarbonate polyol (Mn = 1000) was dehydrated under negative pressure, 23.72 g of toluene diisocyanate was mixed uniformly, placed in a three-necked reactor, and the three-necked reactor was placed in an 85°C oil bath, stirred for 3 hours under nitrogen protection, to prepare a prepolymer.

[0053] (2) Preparation of raw material solution

[0054] 10 g of polyacrylonitrile (PAN) was dissolved in 200.42 ml of DMF organic solvent to prepare a PAN solution as a fiber spinning solution; 10 g of the above-mentioned self-made prepolymer was directly placed in a syringe for standby; 2.8 g of 3,3'-dichloro-4,4-diphenyl methane diamine (MOCA) was heated to 120°C for melting standby.

[0055] (3) Preparation of fiber composite bearing

[0056] The electrospinning device as shown in Figure 1 The electrospinning process was as follows: voltage 20 kV, receiving distance 15 cm, and the pushing speed of the fiber spinning solution was 0.05 mm / min.

[0057] Meanwhile, 10 g of the above-mentioned prepolymer and 2.8 g of MOCA were injected through the nozzle to the fiber drum, the temperature of the fiber drum was 85°C, and the rotating speed was constant at 100 r / min. After 25 min, the operation was stopped, and after 2 hours of heat preservation, the metal drum was removed, and finally it was placed in a 105°C oven for post-curing for 12 h, demolding, to obtain a fiber composite bearing. The pushing speed of the prepolymer was 1.0 mm / min, and the pushing speed of the crosslinking agent was 10 mm / min.

[0058] The test method was the same as in Example 1.

[0059] Example 4

[0060] (1) Preparation of prepolymer

[0061] After negative pressure dehydration, 25 g of polytetramethylene ether glycol (Mn = 2000), 75 g of polycarbonate polyol (Mn = 2000), and 22.34 g of hexamethylene diisocyanate were mixed uniformly, placed in a three-necked reactor, and the three-necked reactor was placed in an 85°C oil bath, stirred for 3 hours under nitrogen protection, to obtain a prepolymer.

[0062] (2) Preparation of raw material solution

[0063] 15 g of polymethyl methacrylate (PMMA) was dissolved in 76.05 ml of acetone organic solvent to prepare a PMMA solution as a fiber spinning solution; 15 g of the above-mentioned self-made prepolymer was directly placed in a syringe for standby; 4.5 g of 3,3'-dichloro-4,4-diphenyl methane diamine (MOCA) was heated to 120°C for melting standby.

[0064] (3) Preparation of fiber composite bearing

[0065] Using the electrospinning device as shown in Figure 1 the fiber spinning receiver was preheated at 85°C for 30 min, and a release agent was applied, and then the PMMA fiber spinning solution prepared above was spun on the surface of the metal drum receiver rotating at a constant speed of 100 r / min using an electrospinning process, the electrospinning process being: voltage 25 kV, receiving distance 20 cm, and the advancing speed of the fiber spinning solution being 0.05 mm / min.

[0066] Meanwhile, 15 g of the prepolymer prepared above and 4.5 g of MOCA were injected through the nozzle respectively to the fiber drum, the temperature of the fiber drum being 85°C and the rotating speed being a constant 100 r / min, after 25 min, the operation was stopped, and after 2 hours of heat preservation, the metal drum was removed, and finally it was placed in a 100°C oven for post-curing for 10 h, demolding, to obtain the fiber composite bearing. The advancing speed of the prepolymer was 1.0 mm / min, and the advancing speed of the crosslinking agent was 10 mm / min.

[0067] The test method was the same as in Example 1.

[0068] Example 5

[0069] (1) Preparation of prepolymer

[0070] After negative pressure dewatering, 50 g of polytetrahydrofuran ether diol (Mn = 2000) and 50 g of polycarbonate polyol (Mn = 2000) were mixed uniformly, placed in a three-necked reactor, and the three-necked reactor was placed in an 85°C oil bath, and stirred for 3 hours under nitrogen protection, to obtain the prepolymer.

[0071] (2) Preparation of raw material solution

[0072] 20 g of polyvinylidene fluoride (PVDF) was dissolved in 400.84 ml of DMF organic solvent to prepare a PVDF solution as a fiber spinning solution; 18 g of the above self-prepared prepolymer was directly placed in a syringe for standby; 5 g of 3,3'-dichloro-4,4-diphenyl methane diamine (MOCA) was heated to 120°C for melting standby.

[0073] (3) Preparation of fiber composite bearing

[0074] Using the electrospinning device as shown in Figure 1The electrospinning apparatus shown first preheats the roller spinning receiver at 85°C for 30 minutes, applies a release agent, and then uses electrospinning to prepare spun fibers by passing the PVDF fiber spinning solution prepared above through the surface of a metal roller receiver rotating at a constant speed of 100 r / min. The electrospinning process is as follows: voltage 20 kV, receiving distance 20 cm, and fiber spinning solution propulsion speed 0.05 mm / min.

[0075] Simultaneously, 18g of the prepolymer and 5g of MOCA prepared above were injected into a fiber roller through a nozzle. The fiber roller temperature was 85℃, and the rotation speed was a constant 100r / min. After 22 minutes, the operation was stopped, and the roller was kept at this temperature for 2 hours. The metal roller was then removed, and the roller was finally placed in a 100℃ oven for 16 hours of curing before demolding to obtain the fiber composite bearing. The prepolymer was propelled at a speed of 1.0mm / min, and the crosslinking agent was propelled at a speed of 15mm / min.

[0076] The testing method is the same as in Example 1.

[0077] Example 6

[0078] (1) Preparation of prepolymer

[0079] After dehydration under negative pressure, 75g of polytetrahydrofuran ether diol (Mn=2000), 25g of polycarbonate polyol (Mn=2000), and 22.34g of hexamethylene diisocyanate were mixed evenly and placed into a three-necked reactor. The three-necked reactor was then placed in an oil bath at 85°C and stirred for 3 hours under nitrogen protection to prepare the prepolymer.

[0080] (2) Preparation of raw material solution

[0081] 20g of polymethyl methacrylate (PMMA) was dissolved in 76.05ml of acetone organic solvent to prepare a PMMA solution, which was used as a fiber spinning solution; 23g of the above-mentioned self-made prepolymer was directly placed into a syringe for later use; 7.2g of 3,3'-dichloro-4,4-diphenylmethanediamine (MOCA) was heated to 120℃ to melt for later use.

[0082] (3) Preparation of fiber composite bearings

[0083] Use such as Figure 1 The electrospinning apparatus shown first preheats the roller spinning receiver at 85°C for 30 minutes, applies a release agent, and then uses electrospinning to prepare the PMMA fiber spinning solution prepared above by passing it through the surface of a metal roller receiver rotating at a constant speed of 100 r / min to produce spun fibers. The electrospinning process is as follows: voltage 25 kV, receiving distance 15 cm, and fiber spinning solution propulsion speed 0.05 mm / min.

[0084] At the same time, 23 g of the prepared prepolymer and 7.2 g of MOCA were injected through the nozzle to the fiber roller, the temperature of the fiber roller was 85°C, the rotation speed was constant 100 r / min, after 30 min, the operation was stopped, after 2 hours of heat preservation, the metal roller was removed, and finally it was placed in a 105°C oven for post-curing for 16 h, demolding, and the fiber composite bearing was prepared. The advancing speed of the prepolymer was 1.0 mm / min, and the advancing speed of the crosslinking agent was 10 mm / min.

[0085] The test method is the same as that in Example 1.

[0086] Example 7

[0087] (1) Preparation of prepolymer

[0088] After negative pressure dewatering, 75 g of polytetrahydrofuran ether diol (Mn = 2000) and 25 g of polycarbonate polyol (Mn = 2000) were mixed uniformly, and then placed in a three-necked reactor, and the three-necked reactor was placed in an 85°C oil bath, and stirred for 3 hours under the protection of nitrogen, to prepare the prepolymer.

[0089] (2) Preparation of raw material solution

[0090] 15 g of polyacrylonitrile (PAN) was dissolved in 89.66 ml of DMF organic solvent to prepare a PAN solution as a fiber spinning solution; 15 g of the above self-prepared prepolymer was directly placed in a syringe for standby; 3.6 g of 4,4-methylenebis(2,6-diethyl)aniline (M-CDEA) was heated to 110°C for melting standby.

[0091] (3) Preparation of fiber composite bearing

[0092] An electrospinning device as shown in Figure 1 was used, first the roller spinning receiver was preheated at 85°C for 30 min, and then the PAN fiber spinning solution prepared above was prepared into a spinning fiber on the surface of the metal roller receiver rotating at a constant speed of 100 r / min by electrospinning process, the electrospinning process was: voltage 15 kV, receiving distance 15 cm, and the advancing speed of the fiber spinning solution was 0.05 mm / min.

[0093] At the same time, 15 g of the prepared prepolymer and 3.6 g of M-CDEA are respectively injected to the fiber roller through the nozzle, the fiber roller temperature is 85°C, the rotating speed is constant 100 r / min, after 25 min, the operation is stopped, after 2 hours of heat preservation, the metal roller is removed, and finally it is placed in a 110°C oven for post-curing for 14 h, demolding, to obtain the fiber composite bearing. The advancing speed of the prepolymer is 1.0 mm / min, and the advancing speed of the crosslinking agent is 15 mm / min.

[0094] The test method is the same as that in Example 1.

[0095] Example 8

[0096] (1) Preparation of prepolymer

[0097] After dehydration under negative pressure, 100 g of polycarbonate polyol (Mn = 3000) and 23.72 g of toluene diisocyanate are mixed uniformly, placed in a three-necked reactor, and the three-necked reactor is placed in an 85°C oil bath, stirred for 3 hours under the condition of nitrogen protection, to obtain the prepolymer.

[0098] (2) Preparation of raw material solution

[0099] 12 g of polyacrylonitrile (PAN) is dissolved in 71.73 ml of DMF organic solvent to prepare a PAN solution as a fiber spinning solution; 20 g of the above self-prepared prepolymer is directly placed in a syringe for standby; 5.6 g of toluene diamine (TDA) is weighed for standby.

[0100] (3) Preparation of fiber composite bearing

[0101] The device as shown in Figure 1 is used, the roller spinning receiver is preheated at 85°C for 30 min, and a release agent is applied, then the above prepared PAN fiber spinning solution is prepared into a spinning fiber on the surface of the rotating metal roller receiver at a constant speed of 100 r / min through the nozzle by using the electrospinning process, the electrospinning process is: voltage 20 kV, receiving distance 15 cm, and the advancing speed of the fiber spinning solution is 0.05 mm / min.

[0102] At the same time, 20 g of the prepared prepolymer and 5.6 g of TDA are respectively injected to the fiber roller through the nozzle, the fiber roller temperature is 85°C, the rotating speed is constant 100 r / min, after 25 min, the operation is stopped, after 2 hours of heat preservation, the metal roller is removed, and finally it is placed in a 105°C oven for post-curing for 12 h, demolding, to obtain the fiber composite bearing. The advancing speed of the prepolymer is 1.0 mm / min, and the advancing speed of the crosslinking agent is 15 mm / min.

[0103] The test method is the same as that in Example 1.

[0104] Example 9

[0105] (1) Preparation of prepolymer

[0106] After 100 g of polypropylene glycol (Mn = 2000) was dehydrated under negative pressure, 32.67 g of isofluroketone diisocyanate was mixed uniformly, placed in a three-necked reactor, and the three-necked reactor was placed in an 85°C oil bath, stirred for 3 hours under nitrogen protection, to prepare a prepolymer.

[0107] (2) Preparation of raw material solution

[0108] 25 g of polyvinylidene fluoride (PVDF) was dissolved in 237.34 ml of DMF organic solvent to prepare a PVDF solution as a fiber spinning solution; 20 g of the above self-prepared prepolymer was directly placed in a syringe for standby; 4.8 g of 4,4'-methylene-bis-(3-chloro-2,6-diethyldiylphenylamine) (M-CDEA) was heated to 110°C for melting standby.

[0109] (3) Preparation of fiber composite bearing

[0110] An electrospinning device as shown in Figure 1 was used. First, the drum spinning receiver was preheated at 85°C for 30 min, and a release agent was applied, and then the above prepared PVDF fiber spinning solution was prepared into a spinning fiber on the surface of the metal drum receiver rotating at a constant speed of 100 r / min by using an electrospinning process, and the electrospinning process was: voltage 25 kV, receiving distance 15 cm, and the advancing speed of the fiber spinning solution was 0.05 mm / min.

[0111] At the same time, 20 g of the above prepared prepolymer and 4.8 g of M-CDEA were injected into the fiber drum through the nozzle, the fiber drum temperature was 85°C, and the rotating speed was constant 100 r / min, after 20 min, the operation was stopped, and after 2 hours of heat preservation, the metal drum was removed, and finally it was placed in a 115°C oven for post-curing for 12 h, demolding, to prepare a fiber composite bearing. The advancing speed of the prepolymer was 1.0 mm / min, and the advancing speed of the crosslinking agent was 15 mm / min.

[0112] The test method is the same as that of Example 1.

[0113] Example 10

[0114] (1) Preparation of prepolymer

[0115] After 100 g of polyethylene glycol adipate diol (Mn = 1000) was dehydrated under negative pressure, 32.67 g of isofluroketone diisocyanate was mixed uniformly, placed in a three-necked reactor, and the three-necked reactor was placed in an 85°C oil bath, stirred for 3 hours under nitrogen protection, to prepare a prepolymer.

[0116] (2) Preparation of raw material solution

[0117] 10 g of polymethyl methacrylate (PMMA) was dissolved in 24.61 ml of DMF organic solvent to prepare a PMMA solution as a fiber spinning solution; 20 g of the above-mentioned self-made prepolymer was directly put into a syringe for standby; 6.5 g of hydroquinone dihydroxyethyl ether (HQEE) was heated to 110°C for melting standby.

[0118] (3) Preparation of fiber composite bearing

[0119] An electrospinning device as shown in Figure 1 The drum spinning receiver was preheated at 85°C for 30 min, and then the electrospinning process was used to prepare the spinning fiber on the surface of the metal drum receiver rotating at a constant speed of 100 r / min by spraying the PMMA fiber spinning solution prepared above through the nozzle, and the electrospinning process was as follows: voltage 15 kV, receiving distance 15 cm, and the advancing speed of the fiber spinning solution was 0.05 mm / min.

[0120] At the same time, 20 g of the above-mentioned prepolymer and 6.5 g of HQEE were injected through the nozzle into the fiber drum, the fiber drum temperature was 85°C, and the rotating speed was constant 100 r / min, after 28 min, the operation was stopped, and after 2 hours of heat preservation, the metal drum was removed, and finally it was placed in a 105°C oven for post-curing for 10 h, demolding, and the fiber composite bearing was prepared. The advancing speed of the prepolymer was 1.0 mm / min, and the advancing speed of the crosslinking agent was 15 mm / min.

[0121] The test method is the same as that of Example 1.

[0122] Example 11

[0123] (1) Preparation of prepolymer

[0124] 100 g of polycaprolactone polyol (Mn = 3000) after negative pressure dehydration was mixed with 28.45 g of phenylene dimethylene diisocyanate, and then put into a three-necked reactor, and the three-necked reactor was put into an 85°C oil bath, and stirred for 3 hours under the protection of nitrogen to prepare the prepolymer.

[0125] (2) Preparation of raw material solution

[0126] 12 g of polymethyl methacrylate (PMMA) was dissolved in 136.88 ml of acetone organic solvent to prepare a PMMA solution as a fiber spinning solution; 18 g of the above-mentioned self-made prepolymer was directly put into a syringe for standby; 1.68 g of 1,4-butanediol (BDO) was weighed for standby.

[0127] (3) Preparation of fiber composite bearing

[0128] Using the electrospinning device as shown in Figure 1 , first preheat the drum spinning receiver at 85°C for 30 min, apply release agent, then use the electrospinning process to spin the fiber spinning solution prepared above through the nozzle onto the surface of the metal drum receiver rotating at a constant speed of 100 r / min. The electrospinning process is: voltage 25 kV, receiving distance 15 cm, and the advancing speed of the fiber spinning solution is 0.05 mm / min.

[0129] At the same time, 18 g of the prepolymer prepared above and 1.68 g of BDO are injected through the nozzle onto the fiber drum, the fiber drum temperature is 85°C, the rotating speed is a constant speed of 100 r / min, after 20 min, stop the operation, after 2 hours of heat preservation, remove the metal drum, and finally place it in a 110°C oven for post-curing for 16 h, demold, and obtain the fiber composite bearing. The advancing speed of the prepolymer is 1.0 mm / min, and the advancing speed of the crosslinking agent is 10 mm / min.

[0130] The test method is the same as in Example 1.

[0131] Example 12

[0132] (1) Preparation of prepolymer

[0133] After negative pressure dehydration, 100 g of polypropylene glycol (Mn = 1000) and 27.56 g of toluene diisocyanate are mixed uniformly, placed in a three-necked reactor, and the three-necked reactor is placed in an 85°C oil bath, stirred for 3 hours under nitrogen protection, and the prepolymer is prepared.

[0134] (2) Preparation of raw material solution

[0135] 15 g of polyvinylidene fluoride (PVDF) is dissolved in 76.05 ml of acetone organic solvent to prepare a PVDF solution as a fiber spinning solution; 18 g of the above self-prepared prepolymer is directly placed in a syringe for standby; 3.6 g of ethylenediamine (EDA) is weighed.

[0136] (3) Preparation of fiber composite bearing

[0137] Using the electrospinning device as shown in Figure 1 , first preheat the drum spinning receiver at 85°C for 30 min, apply release agent, then use the electrospinning process to spin the fiber spinning solution prepared above through the nozzle onto the surface of the metal drum receiver rotating at a constant speed of 100 r / min. The electrospinning process is: voltage 25 kV, receiving distance 15 cm, and the advancing speed of the fiber spinning solution is 0.05 mm / min.

[0138] Simultaneously, 18g of the prepolymer and 3.6g of EDA prepared above were injected into a fiber roller through a nozzle. The fiber roller temperature was 85℃, and the rotation speed was a constant 100r / min. After 30 minutes, the operation was stopped, and the roller was kept at this temperature for 2 hours. The metal roller was then removed, and the roller was finally placed in a 110℃ oven for 20 hours of curing before demolding to obtain the fiber composite bearing. The prepolymer was propelled at a speed of 1.0mm / min, and the crosslinking agent was propelled at a speed of 10mm / min.

[0139] The testing method is the same as in Example 1.

[0140] Example 13

[0141] (1) Preparation of prepolymer

[0142] After dehydration under negative pressure, 25g of polycaprolactone polyol (Mn=3000), 75g of polycarbonate polyol (Mn=3000), and 28.62g of liquefied MDI were mixed evenly and placed into a three-necked reactor. The three-necked reactor was then placed in an 85℃ oil bath and stirred for 3 hours under nitrogen protection to prepare the prepolymer.

[0143] (2) Preparation of raw material solution

[0144] Dissolve 20g of polyacrylonitrile (PAN) in 228.14ml of acetone organic solvent to prepare PAN solution, which will be used as fiber spinning solution; put 18g of the above-mentioned self-made prepolymer directly into a syringe for later use; weigh 2.35g of toluene diamine (TDA) for later use.

[0145] (3) Preparation of fiber composite bearings

[0146] Use such as Figure 1 The electrospinning apparatus shown first preheats the roller spinning receiver at 85°C for 30 minutes, applies a release agent, and then uses electrospinning to prepare spun fibers by passing the PAN fiber spinning solution prepared above through the surface of a metal roller receiver rotating at a constant speed of 100 r / min. The electrospinning process is as follows: voltage 20 kV, receiving distance 15 cm, and fiber spinning solution propulsion speed 0.05 mm / min.

[0147] Simultaneously, 18g of the prepolymer and 2.35g of TDA prepared above were injected into a fiber roller through a nozzle. The fiber roller temperature was 85℃, and the rotation speed was a constant 100r / min. After 28 minutes, the operation was stopped, and the roller was kept at this temperature for 2 hours. The metal roller was then removed, and the roller was finally placed in a 110℃ oven for 20 hours of curing before demolding to obtain the fiber composite bearing. The prepolymer was propelled at a speed of 1.0mm / min, and the crosslinking agent was propelled at a speed of 10mm / min.

[0148] The test method is the same as that in Example 1.

[0149] Example 14

[0150] (1) Preparation of prepolymer

[0151] After negative pressure dehydration, 75 g of polycaprolactone polyol (Mn = 1000), 25 g of polycarbonate polyol (Mn = 1000), and 24.62 g of hexamethylene diisocyanate were mixed uniformly, placed in a three-necked reactor, and the three-necked reactor was placed in an 85°C oil bath, stirred for 3 hours under nitrogen protection, to prepare a prepolymer.

[0152] (2) Preparation of raw material solution

[0153] 15 g of polymethyl methacrylate (PMMA) was dissolved in 116.03 ml of DMF organic solvent to prepare a PMMA solution as a fiber spinning solution; 15 g of the above self-prepared prepolymer was directly placed in a syringe for standby; 4.2 g of 3,5-dimethylthio toluene diamine (DMTDA) was weighed for standby.

[0154] (3) Preparation of fiber composite bearing

[0155] An electrospinning device as shown in Figure 1 was used. First, the drum spinning receiver was preheated at 85°C for 30 min, and release agent was applied, and then the PMMA fiber spinning solution prepared above was prepared into a spinning fiber on the surface of the metal drum receiver rotating at a constant speed of 100 r / min by using an electrospinning process, and the electrospinning process was: voltage 20 kV, receiving distance 15 cm, and the advancing speed of the fiber spinning solution was 0.05 mm / min.

[0156] At the same time, 15 g of the above-prepared prepolymer and 4.2 g of DMTDA were injected into the fiber drum through the nozzle, the fiber drum temperature was 85°C, and the rotating speed was constant 100 r / min, after 25 min, the operation was stopped, and after 2 hours of heat preservation, the metal drum was removed, and finally it was placed in a 105°C oven for post-curing for 16 h, demolding, to prepare a fiber composite bearing. The advancing speed of the prepolymer was 1.0 mm / min, and the advancing speed of the crosslinking agent was 15 mm / min.

[0157] The test method is the same as that in Example 1.

[0158] Example 15

[0159] (1) Preparation of prepolymer

[0160] After negative pressure dehydration, 45 g of bisphenol F epoxy resin NPEF-164X was placed in a three-necked reactor, and the three-necked reactor was placed in an 85°C oil bath, stirred for 2.5 h under nitrogen protection for standby.

[0161] (2) Preparation of raw material solution

[0162] 22 g of polyvinylidene fluoride (PVDF) was dissolved in 155.31 ml of DMF organic solvent to prepare a PVDF solution as a fiber spinning solution; 30 g of the above-mentioned bisphenol F epoxy resin NPEF-164X was directly placed in a syringe for standby.

[0163] (3) Preparation of fiber composite bearing

[0164] An electrospinning device as shown in Figure 1 The drum spinning receiver was preheated at 85°C for 30 min, and a release agent was applied, and then the prepared PVDF fiber spinning solution was prepared into a spinning fiber on the surface of the metal drum receiver rotating at a constant speed of 100 r / min by using an electrospinning process, and the electrospinning process was as follows: voltage 20 kV, receiving distance 15 cm, and the advancing speed of the fiber spinning solution was 0.05 mm / min.

[0165] Meanwhile, 30 g of the prepared prepolymer was injected into the fiber drum through the nozzle, the fiber drum temperature was 85°C, and the rotating speed was constant 100 r / min, after 25 min, the operation was stopped, and after 2 hours of heat preservation, the metal drum was removed, and finally it was placed in a 100°C oven for post-curing for 12 h, demolding, and the fiber composite bearing was prepared. The advancing speed of the prepolymer was 1.0 mm / min.

[0166] The test method is the same as that of Example 1.

[0167] Example 16

[0168] (1) Preparation of prepolymer

[0169] 35 g of bisphenol A epoxy resin E-44 after negative pressure dewatering was placed in a three-necked reactor, and the three-necked reactor was placed in a 105°C oil bath, and stirred for 2.5 h under nitrogen protection for standby.

[0170] (2) Preparation of raw material solution

[0171] 18 g of polyacrylonitrile (PAN) was dissolved in 92.70 ml of DMF organic solvent to prepare a PAN solution as a fiber spinning solution; 20 g of the above-mentioned bisphenol A epoxy resin E-44 was directly placed in a syringe for standby.

[0172] (3) Preparation of fiber composite bearing

[0173] An electrospinning device as shown in Figure 1The electrospinning apparatus shown first preheats the roller spinning receiver at 85°C for 30 minutes, applies a release agent, and then uses electrospinning to prepare spun fibers by passing the PAN fiber spinning solution prepared above through the surface of a metal roller receiver rotating at a constant speed of 100 r / min. The electrospinning process is as follows: voltage 20 kV, receiving distance 25 cm, and fiber spinning solution propulsion speed 0.05 mm / min.

[0174] Simultaneously, 20g of the prepolymer prepared above was injected into a fiber roller through a nozzle. The fiber roller temperature was 85℃, and the rotation speed was a constant 100r / min. After 25 minutes, the operation was stopped, and the roller was kept at this temperature for 2 hours. The metal roller was then removed, and the roller was placed in a 110℃ oven for 10 hours to cure. After demolding, the fiber composite bearing was obtained. The prepolymer feed rate was 1.0mm / min.

[0175] The testing method is the same as in Example 1.

[0176] Example 17

[0177] (1) Preparation of prepolymer

[0178] After dehydration under negative pressure, 30g of bisphenol A epoxy resin E-12 was placed into a three-hole reactor, and the three-hole reactor was placed in a 105℃ oil bath and stirred for 2.5h under nitrogen protection.

[0179] (2) Preparation of raw material solution

[0180] Dissolve 18g of polyvinylidene fluoride (PVDF) in 63.82ml of acetone organic solvent to prepare a PVDF solution, which will be used as a fiber spinning solution; put 25g of the above-mentioned bisphenol A epoxy resin E-12 directly into a syringe for later use.

[0181] (3) Preparation of fiber composite bearings

[0182] Use such as Figure 1 The electrospinning apparatus shown first preheats the roller spinning receiver at 85°C for 30 minutes, applies a release agent, and then uses electrospinning to prepare spun fibers by passing the PVDF fiber spinning solution prepared above through the surface of a metal roller receiver rotating at a constant speed of 100 r / min. The electrospinning process is as follows: voltage 25 kV, receiving distance 15 cm, and fiber spinning solution propulsion speed 0.05 mm / min.

[0183] Meanwhile, 25 g of the prepolymer prepared above was injected through the nozzle to the fiber drum, the fiber drum temperature was 85°C, the rotation speed was constant 100 r / min, after 25 min, the operation was stopped, after 2 h of heat preservation, the metal drum was removed, and finally it was placed in a 115°C oven for post-curing for 18 h, demolding, and the fiber composite bearing was prepared. The advancing speed of the prepolymer was 1.5 mm / min.

[0184] The test method was the same as that in Example 1.

[0185] Example 18

[0186] (1) Preparation of prepolymer

[0187] After negative pressure dehydration, 85 g of polytetrahydrofuran ether glycol (Mn = 2000) was mixed with 24.89 g of hexamethylene diisocyanate, and then placed in a three-necked reactor, and the three-necked reactor was placed in an 85°C oil bath, and stirred for 3 h under the protection of nitrogen to prepare the prepolymer.

[0188] After negative pressure dehydration, 45 g of bisphenol A epoxy resin E-51 was placed in a three-necked reactor, and the three-necked reactor was placed in a 105°C oil bath, and stirred for 2.5 h under the protection of nitrogen for standby.

[0189] (2) Preparation of raw material solution

[0190] 15 g of polyacrylonitrile (PAN) was dissolved in 48.89 ml of acetone organic solvent to prepare a PAN solution as a fiber spinning solution; 10 g of the above self-prepared prepolymer was mixed with 10 g of bisphenol A epoxy resin E-51 and directly placed in a syringe for standby; 2.8 g of glycerol (GI) was weighed for standby.

[0191] (3) Preparation of fiber composite bearing

[0192] An electrospinning device as shown in Figure 1 was used, first the drum spinning receiver was preheated at 85°C for 30 min, and then the PAN fiber spinning solution prepared above was prepared into a spinning fiber on the surface of the metal drum receiver rotating at a constant speed of 100 r / min by electrospinning process, the electrospinning process was: voltage 20 kV, receiving distance 20 cm, the advancing speed of the fiber spinning solution was 0.05 mm / min.

[0193] Meanwhile, 20 g of the prepared prepolymer and 2.8 g of GI are injected through the nozzle to the fiber roller, the temperature of the fiber roller is 85°C, the rotating speed is 100 r / min, after 30 min, the operation is stopped, after 2 hours of heat preservation, the metal roller is removed, and finally it is placed in a 110°C oven for post-curing for 12 h, demolding, and a fiber composite bearing is prepared. The advancing speed of the prepolymer is 1.0 mm / min, and the advancing speed of the crosslinking agent is 10 mm / min.

[0194] The test method is the same as that in Example 1.

[0195] Example 19

[0196] (1) Preparation of prepolymer

[0197] After negative pressure dehydration, 95 g of polytetrahydrofuran ether glycol (Mn = 2000) and 25.68 g of dimethyl diphenyl methane diisocyanate are mixed uniformly, placed in a three-necked reactor, and the three-necked reactor is placed in an 85°C oil bath, stirred for 3 hours under the condition of nitrogen protection, and a prepolymer is prepared.

[0198] After negative pressure dehydration, 35 g of bisphenol F epoxy resin NPEF-170 is placed in a three-necked reactor, and the three-necked reactor is placed in a 105°C oil bath, stirred for 2.5 h under the condition of nitrogen protection.

[0199] (2) Preparation of raw material solution

[0200] 10 g of polymethyl methacrylate (PMMA) is dissolved in 50.69 ml of acetone organic solvent to prepare a PMMA solution as a fiber spinning solution; 15 g of the above self-prepared prepolymer is mixed with 10.0 g of bisphenol F epoxy resin NPEF-170 and directly placed in a syringe for standby; 3.2 g of primary amine polyether amine (PEA) is weighed for standby.

[0201] (3) Preparation of fiber composite bearing

[0202] An electrospinning device as shown in Figure 1 is used, first the roller spinning receiver is preheated at 85°C for 30 min, the release agent is applied, then the PMMA fiber spinning solution prepared above is prepared by electrospinning process through the nozzle on the surface of the metal roller receiver rotating at a constant speed of 100 r / min, the electrospinning process is: voltage 20 kV, receiving distance 10 cm, the advancing speed of the fiber spinning solution is 0.05 mm / min.

[0203] Meanwhile, 25 g of the prepared prepolymer and 3.2 g of PEA are injected through the nozzle to the fiber roller, the temperature of the fiber roller is 85°C, the rotation speed is constant 100 r / min, after 25 min, the operation is stopped, after 2 hours of heat preservation, the metal roller is removed, and finally it is placed in a 105°C oven for post-curing for 20 h, demolding, and a fiber composite bearing is prepared. The advancing speed of the prepolymer is 1.0 mm / min, and the advancing speed of the crosslinking agent is 15 mm / min.

[0204] The test method is the same as that in Example 1.

[0205] Example 20

[0206] (1) Preparation of prepolymer

[0207] After negative pressure dehydration, 75 g of polytetrahydrofuran ether glycol (Mn = 2000) and 27.64 g of 1,5-naphthalene diisocyanate are mixed uniformly, placed in a three-necked reactor, and the three-necked reactor is placed in an 85°C oil bath, stirred for 3 hours under the condition of nitrogen protection, and a prepolymer is prepared.

[0208] After negative pressure dehydration, 40 g of bisphenol A epoxy resin E-20 is placed in a three-necked reactor, and the three-necked reactor is placed in a 105°C oil bath, stirred for 2.5 h under the condition of nitrogen protection.

[0209] (2) Preparation of raw material solution

[0210] 5.0 g of polyvinylidene fluoride (PVDF) is dissolved in 30.90 ml of acetone organic solvent to prepare a PVDF solution as a fiber spinning solution; 15.0 g of the above self-prepared prepolymer and 15.0 g of bisphenol A epoxy resin E-20 are mixed and directly placed in a syringe for standby; 4.8 g of benzoyl peroxide (BPO) is heated to 105°C for melting standby.

[0211] (3) Preparation of fiber composite bearing

[0212] An electrospinning device as shown in Figure 1 is used, first the roller spinning receiver is preheated at 85°C for 30 min, the release agent is applied, then the electrospinning process is used to prepare the spinning fiber by injecting the prepared PVDF fiber spinning solution through the nozzle on the surface of the rotating metal roller receiver at a constant speed of 100 r / min, the electrospinning process is: voltage 20 kV, receiving distance 15 cm, the advancing speed of the fiber spinning solution is 0.05 mm / min.

[0213] At the same time, 30 g of the prepared prepolymer and 4.8 g of BPO were injected into the fiber drum through the nozzle, the fiber drum temperature was 85°C, the rotation speed was constant 100 r / min, after 25 min, the operation was stopped, after 2 hours of heat preservation, the metal drum was removed, and finally it was placed in a 105°C oven for post-curing for 18 h, demolding, and a fiber composite bearing was prepared. The propelling speed of the prepolymer was 1.0 mm / min, and the propelling speed of the crosslinking agent was 15 mm / min.

[0214] The test method was the same as in Example 1.

[0215] Comparative Example 1

[0216] (1) Preparation of prepolymer

[0217] After dehydration under negative pressure, 100 g of polytetrahydrofuran ether glycol (Mn = 2000) and 23.72 g of toluene diisocyanate were mixed uniformly, placed in a three-necked reactor, and the three-necked reactor was placed in an 85°C oil bath, stirred for 3 hours under nitrogen protection, and a prepolymer was prepared.

[0218] (2) Preparation of raw material solution

[0219] 10.0 g of the above self-prepared prepolymer was directly placed in a syringe for standby; 2.8 g of 3,3'-dichloro-4,4-diphenyl methane diamine (MOCA) was heated to 120°C to melt for standby.

[0220] (3) Preparation of fiber composite bearing

[0221] An electrospinning device as shown in ​ was used. First, the drum spinning receiver was preheated at 85°C for 30 min, and a release agent was applied, then 10 g of the prepared prepolymer and 2.8 g of MOCA were injected into the fiber drum through the nozzle, the fiber drum temperature was 85°C, the rotation speed was constant 100 r / min, after 25 min, the operation was stopped, after 2 hours of heat preservation, the metal drum was removed, and finally it was placed in a 115°C oven for post-curing for 18 h, demolding, and a fiber composite bearing was prepared. The electrospinning process was: voltage 15 kV, receiving distance 15 cm, spinning solution propelling speed 0.05 mm / min, propelling speed of the prepolymer 1.0 mm / min, and propelling speed of the crosslinking agent 10 mm / min.

[0222] The test method was the same as in Example 1.

[0223] Comparative Example 2

[0224] In comparison with the mechanical properties of the existing market SAIL COMPAC model bearing, the test method was the same as in Example 1.

[0225] The samples prepared according to Examples 1-20 and Comparative Examples 1-2 were subjected to performance testing.

[0226] The tensile strength was tested according to GB / T 528-2009 standard or method, the elongation at break was tested according to GB / T 528-2009 standard or method, and the friction coefficient was tested according to GB3960-1983 standard or method. The test results are shown in Table 1.

[0227] Table 1: Test results of samples

[0228]

[0229]

[0230] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, but not to limit it. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can still be modified or replaced by equivalents, and these modifications or replacements should not make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A polymer fiber composite bearing and its preparation method, characterized in that, Includes the following steps: (1) Preparation of prepolymer After dehydration under negative pressure, low molecular weight polyol and diisocyanate are mixed evenly with a mass ratio of 100:20-50. Then, the mixture is placed in a three-hole reactor and placed in an oil bath at 75℃-95℃. The mixture is stirred for 2-3 hours under nitrogen protection to prepare the prepolymer. (2) Preparation of raw material solution A certain amount of polymer raw material is dissolved in an organic solvent as a spinning solute, heated and stirred to form a semi-transparent spinning solution with a mass fraction of 5-30 wt%. (3) Preparation of fiber composite bearings The device includes: a fiber spinning nozzle, a prepolymer nozzle, a crosslinking agent nozzle, and a roller spinning receiver; First, preheat the roller spinning receiver at 70-85℃ for 30 minutes, apply a release agent, and then use electrospinning to prepare spun fibers by spraying the fiber spinning solution onto the surface of the metal roller receiver rotating at a constant speed through a nozzle. At the same time, the prepared prepolymer and crosslinking agent are injected into the fiber roller through the nozzle at a quantitative and constant speed. After 20-30 minutes, the operation is stopped, and the roller is kept warm for 2-3 hours before removing it from the metal roller. Finally, the roller is placed in an oven at 105-115℃ for 10-24 hours for post-curing, and then demolded to obtain the fiber composite bearing.

2. The polymer fiber composite bearing and its preparation method according to claim 1, characterized in that: In step (1), the low molecular weight polyol is one or a mixture of polytetrahydrofuran ether polyol, polyethylene oxide polyol, polypropylene glycol, polypropylene triol, polycaprolactone polyol, polycarbonate polyol, polyethylene adipate diol, poly(diethylene phthalate) diol, and poly(3-methyl-1,5-pentanediol). Diisocyanates are one or a mixture of more of the following: hexamethylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, liquefied MDI, toluene diisocyanate, 1,5-naphthalene diisocyanate, phenyl dimethylene diisocyanate, dimethyl diphenylmethane diisocyanate, and isoflurone diisocyanate.

3. The polymer fiber composite bearing and its preparation method according to claim 1, characterized in that: In step (1), the prepolymer is an epoxy resin that is one or more of the following: bisphenol A type epoxy resin, halogenated bisphenol A type epoxy resin, bisphenol S epoxy resin, bisphenol F epoxy resin, aliphatic epoxy resin, acrylic epoxy resin, polybutadiene epoxy resin, organosilicon epoxy resin, unsaturated epoxy resin, ethylene glycol epoxy resin, glycerol epoxy resin, and amino epoxy resin.

4. The polymer fiber composite bearing and its preparation method according to claim 1, characterized in that: In step (2), the polymer raw materials are one or more of the following: vinylidene fluoride, nylon 6, polyimide, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, polystyrene, and polyvinyl alcohol polymers.

5. The polymer fiber composite bearing and its preparation method according to claim 1, characterized in that: In step (3), the crosslinking agent is one or a mixture of 1,4-butanediol, ethylene glycol, 1,6-hexanediol, hydroquinone dihydroxyethyl ether, glycerol, diethylaminoethanol, 3,3'-dichloro-4,4-diphenylmethanediamine, 4,4'-methylene-bis-(3-chloro-2,6-diethylenedianiline), 4,4-methylenebis(2,6-diethyl)aniline, 3,5-dimethylthiotoluenediamine, toluenediamine, dicumyl peroxide, benzoyl peroxide, di-tert-butyl peroxide, ethylenediamine, primary amine polyetheramine, aziridine, and hydroxyl-terminated polyoxypropylene ether crosslinking agent.

6. The polymer fiber composite bearing and its preparation method according to claim 1, characterized in that: In step (3), the voltage of the electrospinning process is 2 to 60 kV.

7. The polymer fiber composite bearing and its preparation method according to claim 1, characterized in that: In step (3), the receiving distance in the electrospinning process is 5 to 30 cm.

8. The polymer fiber composite bearing and its preparation method according to claim 1, characterized in that: In step (3), the propulsion speed of the fiber spinning solution is 0.05 to 1.5 mm / min, the propulsion speed of the prepolymer is 0.05 to 1.5 mm / min, and the propulsion speed of the crosslinking agent is 0.1 to 15 mm / min.

9. The polymer fiber composite bearing and its preparation method according to claim 1, characterized in that: In step (3), the roller spinning receiver is also connected to a heating device, and the heating temperature of the roller spinning receiver is 75-100℃.

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