Modified high-performance polytetrafluoroethylene tube based on carbon nano tube and preparation method of modified high-performance polytetrafluoroethylene tube

Abstract

The invention relates to the field of polytetrafluoroethylene tubes, in particular to a modified high-performance polytetrafluoroethylene tube based on a carbon nano tube and a preparation method of the modified high-performance polytetrafluoroethylene tube, which are used for solving the problems that the mechanical property of the existing polytetrafluoroethylene tube is poor, and the interfacial compatibility between the carbon nano tube and a polytetrafluoroethylene matrix is poor, so that the overall performance of the polytetrafluoroethylene tube is influenced. According to the preparation method, reinforced and modified carbon nanotubes are introduced to modify a polytetrafluoroethylene tube, so that uniform dispersion and effective combination of the carbon nanotubes in a polytetrafluoroethylene resin matrix are realized, and the excellent performance of polytetrafluoroethylene and the reinforcement advantage of the carbon nanotubes are combined; according to the preparation method, excellent heat resistance, lubricity and chemical corrosion resistance of the polytetrafluoroethylene pipe are maintained, meanwhile, the mechanical property and wear resistance of the polytetrafluoroethylene pipe are remarkably improved, the defects that a traditional polytetrafluoroethylene pipe is low in mechanical strength and poor in wear resistance are successfully overcome, the application field of the polytetrafluoroethylene pipe is greatly expanded, and the preparation method is simple in process, convenient to operate and suitable for industrial production. The industrial production is easy to realize.

Description

Technical Field

[0001] The invention relates to the field of polytetrafluoroethylene tubes, and in particular to a high-performance polytetrafluoroethylene tube modified based on carbon nanotubes and a preparation method thereof. Background Art

[0002] PTFE tubes, also known as polytetrafluoroethylene tubes, are widely used in the fields of chemistry, electronics, aerospace, etc. due to their excellent chemical stability, extremely low friction coefficient and wide range of temperature resistance. However, with the rapid development of modern industry, the defects of traditional polytetrafluoroethylene tubes in mechanical strength have gradually become prominent. They are prone to deformation or even rupture when subjected to high pressure or external impact, which limits their application in some high-performance occasions.

[0003] Carbon nanotubes are ideal reinforcement phase materials due to their high strength, high electrical conductivity and high thermal conductivity. However, due to their small size and huge surface area, carbon nanotubes have poor dispersibility and are easily agglomerated, resulting in poor dispersibility and interfacial bonding of carbon nanotubes in polytetrafluoroethylene matrix, making it difficult for them to fully demonstrate their performance in composite materials, thereby reducing the performance of the composite materials.

[0004] Therefore, it is of great significance to develop a high-performance polytetrafluoroethylene tube modified with carbon nanotubes and a preparation method thereof. Summary of the invention

[0005] In order to overcome the above technical problems, the purpose of the present invention is to provide a high-performance polytetrafluoroethylene tube modified based on carbon nanotubes and a preparation method thereof, which solves the problem that the existing polytetrafluoroethylene tubes have poor mechanical properties and the interface compatibility between carbon nanotubes and polytetrafluoroethylene matrix is ​​poor, thereby affecting the overall performance of the polytetrafluoroethylene tube.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A high-performance polytetrafluoroethylene tube modified with carbon nanotubes, comprising the following components in parts by weight:

[0008] 80-90 parts of polytetrafluoroethylene resin, 8-16 parts of carbon black, 1.3-4.1 parts of reinforced modified carbon nanotubes, 0.3-0.9 parts of sodium dodecylbenzene sulfonate, 1-3 parts of magnesium stearate and 50-55 parts of anhydrous ethanol;

[0009] Wherein, the enhanced modified carbon nanotubes are prepared by the following steps:

[0010] Step s1: Add carbon nanotubes, concentrated sulfuric acid and concentrated nitric acid into a three-necked flask equipped with a stirrer, a thermometer and an air duct, introduce nitrogen protection, stir and react for 2-3 hours at a temperature of 25-30°C and a stirring rate of 300-400r / min, then heat to 130-135°C and continue stirring and reacting for 3-4 hours. After the reaction is completed, cool the reaction product to room temperature, then vacuum filter, wash the filter cake with distilled water for 3-5 times, then place it in a vacuum drying oven, and dry it at a temperature of 60-65°C for 2-3 hours to obtain oxidized carbon nanotubes;

[0011] Step s2: adding oxidized carbon nanotubes, γ-methacryloxypropyltrimethoxysilane, hydrochloric acid solution and ethanol solution into a three-necked flask equipped with a stirrer, a thermometer and an air duct, introducing nitrogen protection, stirring the reaction at a temperature of 25-30°C and a stirring rate of 300-400r / min for 10-15min, then heating to 80-85°C and continuing to stir the reaction for 4-5h. After the reaction is completed, the reaction product is cooled to room temperature and then centrifuged. The precipitate is washed with anhydrous ethanol for 3-5 times, and then placed in a vacuum drying oven and dried at a temperature of 70-75°C for 2-3h to obtain olefinic carbon nanotubes;

[0012] Step s3: Add 4-hydroxybenzaldehyde, triethylamine, N,N-dimethylaminopyridine and anhydrous tetrahydrofuran into a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, stir and react for 10-15 minutes at a temperature of 25-30°C and a stirring rate of 300-400r / min, then add the hexachlorocyclotriphosphazene solution dropwise while stirring, and control the dropping rate to 1-2 drops / s. After the addition is completed, the temperature is raised to 45-50°C and the stirring reaction is continued for 5-6 hours. After the reaction is completed, the reaction product is cooled to room temperature, and then the solvent is removed by rotary evaporation, and then recrystallized from ethyl acetate to obtain a polyaldehyde intermediate;

[0013] Step s4: Add the polyaldehyde intermediate, sodium borohydride, anhydrous methanol and anhydrous tetrahydrofuran into a three-necked flask equipped with a stirrer, a thermometer and a gas guide tube, introduce nitrogen protection, and stir the reaction for 13-15 hours at a temperature of 25-30° C. and a stirring rate of 300-400 r / min. After the reaction is completed, add the reaction product to a hydrochloric acid solution, then let it stand for 2-3 hours, and then adjust the pH to 7 with a sodium hydroxide solution, and then vacuum filter, and rotary evaporate the filtrate to remove the solvent to obtain a polyhydroxymethyl intermediate;

[0014] Step s5: adding the polyhydroxymethyl intermediate, mercaptopropionic acid, p-toluenesulfonic acid and anhydrous toluene into a three-necked flask equipped with a stirrer, a thermometer, an air duct and a reflux condenser, introducing nitrogen protection, stirring the reaction for 20-30 minutes at a temperature of 25-30° C. and a stirring rate of 300-400 r / min, then heating to reflux and continuing to stir the reaction for 6-8 hours, and after the reaction is completed, cooling the reaction product to room temperature, then washing it with sodium hydroxide solution and distilled water for 3-5 times in sequence, then drying it with anhydrous sodium sulfate, and then vacuum filtering, and rotary evaporating the filtrate to remove the solvent to obtain a polythiol intermediate;

[0015] Step s6: Add olefinic carbon nanotubes, polythiol intermediates and anhydrous tetrahydrofuran into a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, introduce nitrogen protection, stir and react for 10-12 hours at a temperature of 25-30° C. and a stirring rate of 300-400 r / min. After the reaction is completed, centrifuge the reaction product, wash the precipitate with distilled water for 3-5 times, and then place it in a vacuum drying oven and dry it at a temperature of 70-75° C. for 2-3 hours to obtain thiol carbon nanotubes;

[0016] Step s7: Add mercapto carbon nanotubes, glycidyl methacrylate and anhydrous tetrahydrofuran into a three-necked flask equipped with a stirrer, a thermometer and an air duct, introduce nitrogen protection, stir the reaction at a temperature of 25-30°C and a stirring rate of 300-400r / min for 1-2h, then raise the temperature to 45-50°C and continue stirring the reaction for 5-6h. After the reaction is completed, the reaction product is cooled to room temperature and then centrifuged. The precipitate is washed with distilled water for 3-5 times, and then placed in a vacuum drying oven and dried at a temperature of 50-55°C for 5-6h to obtain reinforced modified carbon nanotubes.

[0017] As a further solution of the present invention: the usage ratio of the carbon nanotubes, concentrated sulfuric acid and concentrated nitric acid in step s1 is 5g:75-80mL:30-35mL.

[0018] As a further solution of the present invention: the carbon nanotubes in step s1 are multi-walled carbon nanotubes with an outer diameter of 15-25 nm and a tube length of 5-15 μm; the mass fraction of the concentrated sulfuric acid is 98%; and the mass fraction of the concentrated nitric acid is 68%.

[0019] As a further solution of the present invention: the usage ratio of the oxidized carbon nanotubes, γ-methacryloxypropyltrimethoxysilane, hydrochloric acid solution and ethanol solution in step s2 is 5g:1-3g:8-10mL:90-100mL.

[0020] As a further solution of the present invention: the mass fraction of the hydrochloric acid solution in step s2 is 10-12%; the volume fraction of the ethanol solution is 85-90%.

[0021] As a further solution of the present invention: the dosage ratio of the 4-hydroxybenzaldehyde, triethylamine, N,N-dimethylaminopyridine, anhydrous tetrahydrofuran and hexachlorocyclotriphosphazene solution in step s3 is 25-30 mmol: 4-5 mL: 0.12-0.16 g: 15-20 mL: 10 mL.

[0022] As a further solution of the present invention: the hexachlorocyclotriphosphazene solution in step s3 is a solution formed by dissolving hexachlorocyclotriphosphazene in anhydrous tetrahydrofuran at a ratio of 3-4 mmol:10 mL.

[0023] As a further solution of the present invention: the dosage ratio of the polyaldehyde intermediate, sodium borohydride, anhydrous methanol and anhydrous tetrahydrofuran in step s4 is 10 mmol: 80-90 mmol: 25-30 mL: 80-90 mL.

[0024] As a further solution of the present invention: the mass fraction of the hydrochloric acid solution in step s4 is 5-7%; the mass fraction of the sodium hydroxide solution is 10-15%.

[0025] As a further solution of the present invention: the usage ratio of the polyhydroxymethyl intermediate, mercaptopropionic acid, p-toluenesulfonic acid and anhydrous toluene in step s5 is 10 mmol: 70-80 mmol: 0.5-0.9 g: 100-120 mL.

[0026] As a further solution of the present invention: the mass fraction of the sodium hydroxide solution in step s5 is 5-7%.

[0027] As a further solution of the present invention: the usage ratio of the olefinic carbon nanotubes, the polythiol intermediate and anhydrous tetrahydrofuran in step s6 is 5g:2-8mmol:80-100mL.

[0028] As a further solution of the present invention: the usage ratio of the mercapto carbon nanotubes, glycidyl methacrylate and anhydrous tetrahydrofuran in step s7 is 3g:2-10g:70-80mL.

[0029] As a further solution of the present invention: a method for preparing a high-performance polytetrafluoroethylene tube modified with carbon nanotubes, comprising the following steps:

[0030] Step 1: Weigh 80-90 parts of polytetrafluoroethylene resin, 8-16 parts of carbon black, 1.3-4.1 parts of reinforced modified carbon nanotubes, 0.3-0.9 parts of sodium dodecylbenzene sulfonate, 1-3 parts of magnesium stearate and 50-55 parts of anhydrous ethanol according to weight parts, and set aside;

[0031] Step 2: adding polytetrafluoroethylene resin, carbon black, reinforced modified carbon nanotubes, sodium dodecylbenzene sulfonate, magnesium stearate and anhydrous ethanol into a mixer, stirring and mixing for 6-8 hours at a temperature of 45-50° C. and a stirring rate of 500-600 r / min, and then placing in a vacuum drying oven, drying for 8-10 hours at a temperature of 80-85° C. to obtain a mixed material;

[0032] Step 3: Add the mixed material into the mold, and then maintain the pressure for 40-60 minutes at a pressure of 35-55 MPa to obtain a pipe blank;

[0033] Step 4: Place the tube blank in a muffle furnace, heat it to 360-380°C at a heating rate of 30-35°C / h and sinter it for 2-3h, then cool it in the furnace and take it out of the mold to obtain a high-performance polytetrafluoroethylene tube modified with carbon nanotubes.

[0034] Beneficial effects of the present invention:

[0035] The invention discloses a high-performance tetrafluoroethylene tube modified based on carbon nanotubes and a preparation method thereof. The method comprises the following steps: adding polytetrafluoroethylene resin, carbon black, enhanced modified carbon nanotubes, sodium dodecylbenzene sulfonate, magnesium stearate and anhydrous ethanol into a mixer, stirring and mixing, and then drying to obtain a mixed material; adding the mixed material into a mold for pressure holding treatment to obtain a tube blank; placing the tube blank in a muffle furnace for sintering, cooling it with the furnace, and taking it out from the mold to obtain a high-performance tetrafluoroethylene tube modified based on carbon nanotubes; the preparation method introduces enhanced modified carbon nanotubes. The polytetrafluoroethylene tube is modified by the tube to achieve uniform dispersion and effective combination of carbon nanotubes in the polytetrafluoroethylene resin matrix, combining the excellent properties of polytetrafluoroethylene and the enhanced advantages of carbon nanotubes, maintaining the excellent heat resistance, lubricity and chemical corrosion resistance of the polytetrafluoroethylene tube, and significantly improving the mechanical properties and wear resistance of the polytetrafluoroethylene tube, successfully overcoming the defects of low mechanical strength and poor wear resistance of traditional polytetrafluoroethylene tubes, greatly expanding the application field of polytetrafluoroethylene tubes, and the preparation method is simple in process, easy to operate, and easy to realize industrial production.

[0036] In the process of preparing high-performance tetrafluoroethylene modified carbon nanotubes, a reinforced modified carbon nanotube is first prepared. First, the carbon nanotube is oxidized by concentrated sulfuric acid and concentrated nitric acid to introduce a large number of oxygen-containing functional groups (carboxyl and hydroxyl groups) to obtain oxidized carbon nanotubes. Then, the oxidized carbon nanotubes are treated with γ-methacryloxypropyltrimethoxysilane. The siloxane on the γ-methacryloxypropyltrimethoxysilane is hydrolyzed to form silanols, which can react with the oxygen-containing functional groups on the carbon nanotubes. At the same time, a large number of olefin groups are introduced on the carbon nanotubes. The alkenyl carbon nanotubes are obtained by reacting 4-hydroxybenzaldehyde with hexachlorocyclotriphosphazene, wherein the hydroxyl groups on the 4-hydroxybenzaldehyde react with the chlorine atoms on the hexachlorocyclotriphosphazene to introduce a large number of aldehyde groups to obtain a multi-aldehyde intermediate, and then the aldehyde groups on the multi-aldehyde intermediate are reduced to hydroxyl groups under the action of sodium borohydride to obtain a polyhydroxymethyl intermediate, and then the polyhydroxymethyl intermediate is reacted with mercaptopropionic acid, and the hydroxyl groups on the polyhydroxymethyl intermediate react with the carboxyl groups on the mercaptopropionic acid to undergo an esterification reaction to introduce a large number of thiols to obtain a polythio intermediate, and then the polythiosulfate intermediate is used. The alkenyl carbon nanotubes are treated with a multi-thiol intermediate, and the alkenyl on the alkenyl carbon nanotubes undergoes a click chemical reaction with the thiol on the multi-thiol intermediate, and a large number of thiol groups are introduced to obtain thiol carbon nanotubes. Then, the thiol carbon nanotubes and glycidyl methacrylate are reacted, and the thiol on the thiol carbon nanotubes undergoes a click chemical reaction with the alkenyl on the glycidyl methacrylate, and a large number of epoxy groups are introduced to obtain enhanced modified carbon nanotubes. The carbon nanotubes have excellent mechanical properties, and adding them to the tetrafluoroethylene tube can significantly improve its mechanical strength. After the carbon nanotubes are modified by the multi-thiol intermediate, the surface of the carbon nanotubes can be chemically modified, which significantly improves the dispersibility and interface bonding strength of the carbon nanotubes in the tetrafluoroethylene tube. At the same time, a large number of benzene rings are introduced to further improve the mechanical strength of the carbon nanotubes. At the same time, after a large number of epoxy groups are introduced, the carbon nanotubes can be chemically bonded with other raw materials in the tetrafluoroethylene tube using the epoxy groups, so that the interface bonding strength is further significantly improved, the interface bonding between the carbon nanotubes and polytetrafluoroethylene is optimized, and the comprehensive performance of the tube is greatly improved. DETAILED DESCRIPTION

[0037] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Embodiment 1:

[0039] This embodiment is a method for preparing a high-performance polytetrafluoroethylene tube modified with carbon nanotubes, comprising the following steps:

[0040] Step S1: 5 g of multi-walled carbon nanotubes, 75 mL of concentrated sulfuric acid with a mass fraction of 98%, and 30 mL of concentrated nitric acid with a mass fraction of 68% are added to a three-necked flask equipped with a stirrer, a thermometer, and a gas guide tube, and nitrogen is introduced for protection. The mixture is stirred and reacted for 2 h at a temperature of 25° C. and a stirring rate of 300 r / min, and then the mixture is heated to 130° C. and the stirring reaction is continued for 3 h. After the reaction is completed, the reaction product is cooled to room temperature, and then vacuum filtered. The filter cake is washed with distilled water for 3 times, and then placed in a vacuum drying oven and dried at a temperature of 60° C. for 2 h to obtain oxidized carbon nanotubes;

[0041] Step S2: 5 g of oxidized carbon nanotubes, 1 g of γ-methacryloxypropyltrimethoxysilane, 8 mL of a 10% hydrochloric acid solution by mass, and 90 mL of an 85% ethanol solution by volume were added to a three-necked flask equipped with a stirrer, a thermometer, and an air guide tube, and nitrogen was introduced for protection. The mixture was stirred at 25° C. and a stirring rate of 300 r / min for 10 min, and then the mixture was heated to 80° C. and stirred for 4 h. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with anhydrous ethanol for 3 times, and then placed in a vacuum drying oven and dried at 70° C. for 2 h to obtain olefinic carbon nanotubes;

[0042] Step S3: 25 mmol 4-hydroxybenzaldehyde, 4 mL triethylamine, 0.12 g N, N-dimethylaminopyridine and 15 mL anhydrous tetrahydrofuran are added to a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, and stirred for reaction at a temperature of 25° C. and a stirring rate of 300 r / min for 10 min, and then 10 mL of a hexachlorocyclotriphosphazene solution prepared by dissolving hexachlorocyclotriphosphazene in anhydrous tetrahydrofuran at a ratio of 3 mmol : 10 mL is added dropwise while stirring, and the dropping rate is controlled to be 1 drop / s. After the dropwise addition is completed, the temperature is raised to 45° C. and the stirring reaction is continued for 5 h. After the reaction is completed, the reaction product is cooled to room temperature, and then the solvent is removed by rotary evaporation, and then recrystallized from ethyl acetate to obtain a polyaldehyde intermediate;

[0043] Step S4: 10 mmol of a polyaldehyde intermediate, 80 mmol of sodium borohydride, 25 mL of anhydrous methanol and 80 mL of anhydrous tetrahydrofuran are added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and nitrogen is introduced for protection. The mixture is stirred for reaction at a temperature of 25° C. and a stirring rate of 300 r / min for 13 hours. After the reaction is completed, the reaction product is added to a 5% hydrochloric acid solution, and then allowed to stand for 2 hours. The pH value is then adjusted to 7 with a 10% sodium hydroxide solution, and then vacuum filtered, and the filtrate is rotary evaporated to remove the solvent to obtain a polyhydroxymethyl intermediate;

[0044] Step S5: 10 mmol of polyhydroxymethyl intermediate, 70 mmol of mercaptopropionic acid, 0.5 g of p-toluenesulfonic acid and 100 mL of anhydrous toluene are added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a reflux condenser, and nitrogen is introduced for protection. The mixture is stirred for reaction at a temperature of 25° C. and a stirring rate of 300 r / min for 20 min, and then the mixture is heated to reflux and stirred for reaction for 6 h. After the reaction is completed, the reaction product is cooled to room temperature, and then washed with 5% sodium hydroxide solution and distilled water for 3 times in sequence, and then dried with anhydrous sodium sulfate, and then vacuum filtered, and the filtrate is rotary evaporated to remove the solvent to obtain a polythiol intermediate;

[0045] Step S6: 5 g of olefinic carbon nanotubes, 2 mmol of polythiol intermediates and 80 mL of anhydrous tetrahydrofuran were added to a three-necked flask equipped with a stirrer, a thermometer and a gas guide tube, and nitrogen was introduced for protection. The mixture was stirred for reaction at a temperature of 25° C. and a stirring rate of 300 r / min for 10 h. After the reaction was completed, the reaction product was centrifuged, and the precipitate was washed with distilled water for 3 times, and then placed in a vacuum drying oven and dried at a temperature of 70° C. for 2 h to obtain thiol carbon nanotubes;

[0046] Step S7: 3 g of mercapto carbon nanotubes, 2 g of glycidyl methacrylate and 70 mL of anhydrous tetrahydrofuran were added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and nitrogen was introduced for protection. The mixture was stirred at 25° C. and a stirring rate of 300 r / min for 1 h, and then the mixture was heated to 45° C. and stirred for 5 h. After the reaction, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with distilled water for 3 times, and then placed in a vacuum drying oven and dried at 50° C. for 5 h to obtain enhanced modified carbon nanotubes.

[0047] Step S8: Weigh 80 parts of polytetrafluoroethylene resin, 8 parts of carbon black, 1.3 parts of reinforced modified carbon nanotubes, 0.3 parts of sodium dodecylbenzene sulfonate, 1 part of magnesium stearate and 50 parts of anhydrous ethanol according to weight parts, and set aside;

[0048] Step S9: adding polytetrafluoroethylene resin, carbon black, reinforced modified carbon nanotubes, sodium dodecylbenzene sulfonate, magnesium stearate and anhydrous ethanol into a mixer, stirring and mixing for 6 hours at a temperature of 45° C. and a stirring rate of 500 r / min, and then placing in a vacuum drying oven and drying for 8 hours at a temperature of 80° C. to obtain a mixed material;

[0049] Step S10: adding the mixed material into the mold, and then maintaining the pressure for 40 minutes under the condition of 35 MPa to obtain a pipe blank;

[0050] Step S11: placing the tube blank in a muffle furnace, heating it to 360° C. at a heating rate of 30° C. / h and sintering it for 2 h, then cooling it in the furnace and taking it out of the mold to obtain a high-performance polytetrafluoroethylene tube modified with carbon nanotubes.

[0051] Embodiment 2:

[0052] This embodiment is a method for preparing a high-performance polytetrafluoroethylene tube modified with carbon nanotubes, comprising the following steps:

[0053] Step S1: 5 g of multi-walled carbon nanotubes, 78 mL of concentrated sulfuric acid with a mass fraction of 98%, and 32 mL of concentrated nitric acid with a mass fraction of 68% are added to a three-necked flask equipped with a stirrer, a thermometer, and a gas duct, and nitrogen is introduced for protection. The mixture is stirred for reaction at a temperature of 28° C. and a stirring rate of 350 r / min for 2.5 h, and then the temperature is raised to 132° C. and the stirring reaction is continued for 3.5 h. After the reaction is completed, the reaction product is cooled to room temperature, and then vacuum filtered. The filter cake is washed with distilled water for 4 times, and then placed in a vacuum drying oven and dried at a temperature of 62° C. for 2.5 h to obtain oxidized carbon nanotubes;

[0054] Step S2: 5 g of oxidized carbon nanotubes, 2 g of γ-methacryloxypropyltrimethoxysilane, 9 mL of 11% hydrochloric acid solution by mass, and 95 mL of 88% ethanol solution by volume were added to a three-necked flask equipped with a stirrer, a thermometer, and an air duct, and nitrogen was introduced for protection. The mixture was stirred at 28° C. and a stirring rate of 350 r / min for 12 min, and then the mixture was heated to 82° C. and stirred for 4.5 h. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with anhydrous ethanol for 4 times, and then placed in a vacuum drying oven and dried at 72° C. for 2.5 h to obtain olefinic carbon nanotubes;

[0055] Step S3: 28 mmol 4-hydroxybenzaldehyde, 4.5 mL triethylamine, 0.14 g N, N-dimethylaminopyridine and 18 mL anhydrous tetrahydrofuran are added to a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, and stirred for reaction at a temperature of 28° C. and a stirring rate of 350 r / min for 12 min, and then 10 mL of a hexachlorocyclotriphosphazene solution prepared by dissolving hexachlorocyclotriphosphazene in anhydrous tetrahydrofuran at a ratio of 3.5 mmol : 10 mL is added dropwise while stirring, and the dropping rate is controlled to be 1 drop / s. After the dropwise addition is completed, the temperature is raised to 48° C. and the stirring reaction is continued for 5.5 h. After the reaction is completed, the reaction product is cooled to room temperature, and then the solvent is removed by rotary evaporation, and then recrystallized from ethyl acetate to obtain a polyaldehyde intermediate;

[0056] Step S4: 10 mmol of a polyaldehyde intermediate, 85 mmol of sodium borohydride, 28 mL of anhydrous methanol and 85 mL of anhydrous tetrahydrofuran are added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and nitrogen is introduced for protection. The reaction is stirred for 14 hours at a temperature of 28° C. and a stirring rate of 350 r / min. After the reaction is completed, the reaction product is added to a 6% hydrochloric acid solution, and then allowed to stand for 2.5 hours. Then, the pH is adjusted to 7 with a 12% sodium hydroxide solution, and then vacuum filtered, and the filtrate is rotary evaporated to remove the solvent to obtain a polyhydroxymethyl intermediate;

[0057] Step S5: 10 mmol of polyhydroxymethyl intermediate, 75 mmol of mercaptopropionic acid, 0.7 g of p-toluenesulfonic acid and 110 mL of anhydrous toluene are added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a reflux condenser, and nitrogen is introduced for protection. The mixture is stirred for reaction at a temperature of 28° C. and a stirring rate of 350 r / min for 25 min, and then the mixture is heated to reflux and stirred for reaction for 7 h. After the reaction is completed, the reaction product is cooled to room temperature, and then washed with a 6% sodium hydroxide solution and distilled water for 4 times in sequence, and then dried with anhydrous sodium sulfate, and then vacuum filtered, and the filtrate is rotary evaporated to remove the solvent to obtain a polythiol intermediate;

[0058] Step S6: 5 g of olefinic carbon nanotubes, 5 mmol of polythiol intermediates and 90 mL of anhydrous tetrahydrofuran were added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and nitrogen was introduced for protection. The reaction was stirred at a temperature of 28° C. and a stirring rate of 350 r / min for 11 h. After the reaction was completed, the reaction product was centrifuged, and the precipitate was washed with distilled water for 4 times, and then placed in a vacuum drying oven and dried at a temperature of 72° C. for 2.5 h to obtain thiol carbon nanotubes;

[0059] Step S7: 3 g of mercapto carbon nanotubes, 6 g of glycidyl methacrylate and 75 mL of anhydrous tetrahydrofuran were added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and nitrogen was introduced for protection. The reaction was stirred at a temperature of 28° C. and a stirring rate of 350 r / min for 1.5 h, and then the temperature was raised to 48° C. and the stirring reaction was continued for 5.5 h. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with distilled water 4 times, and then placed in a vacuum drying oven and dried at a temperature of 52° C. for 5.5 h to obtain enhanced modified carbon nanotubes;

[0060] Step S8: 85 parts of polytetrafluoroethylene resin, 12 parts of carbon black, 2.7 parts of reinforced modified carbon nanotubes, 0.6 parts of sodium dodecylbenzene sulfonate, 2 parts of magnesium stearate and 52 parts of anhydrous ethanol were weighed according to weight parts and set aside;

[0061] Step S9: adding polytetrafluoroethylene resin, carbon black, reinforced modified carbon nanotubes, sodium dodecylbenzene sulfonate, magnesium stearate and anhydrous ethanol into a mixer, stirring and mixing for 7 hours at a temperature of 48° C. and a stirring rate of 550 r / min, and then placing in a vacuum drying oven and drying for 9 hours at a temperature of 82° C. to obtain a mixed material;

[0062] Step S10: adding the mixed material into the mold, and then maintaining the pressure for 50 minutes under the condition of 45 MPa to obtain a pipe blank;

[0063] Step S11: placing the tube blank in a muffle furnace, heating it to 370°C at a heating rate of 32°C / h and sintering it for 2.5h, then cooling it in the furnace and taking it out from the mold to obtain a high-performance polytetrafluoroethylene tube modified with carbon nanotubes.

[0064] Embodiment 3:

[0065] This embodiment is a method for preparing a high-performance polytetrafluoroethylene tube modified with carbon nanotubes, comprising the following steps:

[0066] Step S1: 5 g of multi-walled carbon nanotubes, 80 mL of concentrated sulfuric acid with a mass fraction of 98%, and 35 mL of concentrated nitric acid with a mass fraction of 68% are added to a three-necked flask equipped with a stirrer, a thermometer, and a gas guide tube, and nitrogen is introduced for protection. The mixture is stirred and reacted for 3 hours at a temperature of 30° C. and a stirring rate of 400 r / min, and then the mixture is heated to 135° C. and stirred and reacted for 4 hours. After the reaction is completed, the reaction product is cooled to room temperature, and then vacuum filtered. The filter cake is washed with distilled water for 5 times, and then placed in a vacuum drying oven and dried at a temperature of 65° C. for 3 hours to obtain oxidized carbon nanotubes;

[0067] Step S2: 5 g of oxidized carbon nanotubes, 3 g of γ-methacryloxypropyltrimethoxysilane, 10 mL of a 12% hydrochloric acid solution by mass, and 100 mL of an ethanol solution by volume with a 90% ethanol solution are added to a three-necked flask equipped with a stirrer, a thermometer, and an air guide tube, and nitrogen is introduced for protection. The mixture is stirred for reaction at a temperature of 30° C. and a stirring rate of 400 r / min for 15 min, and then the mixture is heated to 85° C. and stirred for reaction for 5 h. After the reaction is completed, the reaction product is cooled to room temperature and then centrifuged. The precipitate is washed with anhydrous ethanol for 5 times, and then placed in a vacuum drying oven and dried at a temperature of 75° C. for 3 h to obtain olefinic carbon nanotubes;

[0068] Step S3: 30 mmol 4-hydroxybenzaldehyde, 5 mL triethylamine, 0.16 g N, N-dimethylaminopyridine and 20 mL anhydrous tetrahydrofuran are added to a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, and stirred for reaction at a temperature of 30° C. and a stirring rate of 400 r / min for 15 min, and then 10 mL of a hexachlorocyclotriphosphazene solution prepared by dissolving hexachlorocyclotriphosphazene in anhydrous tetrahydrofuran at a ratio of 4 mmol : 10 mL is added dropwise while stirring, and the dropping rate is controlled to be 2 drops / s. After the dropwise addition is completed, the temperature is raised to 50° C. and the stirring reaction is continued for 6 h. After the reaction is completed, the reaction product is cooled to room temperature, and then the solvent is removed by rotary evaporation, and then recrystallized from ethyl acetate to obtain a polyaldehyde intermediate;

[0069] Step S4: 10 mmol of a polyaldehyde intermediate, 90 mmol of sodium borohydride, 30 mL of anhydrous methanol and 90 mL of anhydrous tetrahydrofuran are added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and nitrogen is introduced for protection. The mixture is stirred for reaction at a temperature of 30° C. and a stirring rate of 400 r / min for 15 hours. After the reaction is completed, the reaction product is added to a 7% hydrochloric acid solution, and then allowed to stand for 3 hours. The pH value is then adjusted to 7 with a 15% sodium hydroxide solution, and then vacuum filtered, and the filtrate is rotary evaporated to remove the solvent to obtain a polyhydroxymethyl intermediate;

[0070] Step S5: 10 mmol of polyhydroxymethyl intermediate, 80 mmol of mercaptopropionic acid, 0.9 g of p-toluenesulfonic acid and 120 mL of anhydrous toluene are added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a reflux condenser, and nitrogen is introduced for protection. The mixture is stirred for reaction at a temperature of 30° C. and a stirring rate of 400 r / min for 30 min, and then the temperature is raised to reflux and the stirring reaction is continued for 8 h. After the reaction is completed, the reaction product is cooled to room temperature, and then washed with a 7% sodium hydroxide solution and distilled water for 5 times in sequence, and then dried with anhydrous sodium sulfate, and then vacuum filtered, and the filtrate is rotary evaporated to remove the solvent to obtain a polythiol intermediate;

[0071] Step S6: 5 g of olefinic carbon nanotubes, 8 mmol of polythiol intermediates and 100 mL of anhydrous tetrahydrofuran were added to a three-necked flask equipped with a stirrer, a thermometer and a gas guide tube, and nitrogen was introduced for protection. The reaction was stirred at a temperature of 30° C. and a stirring rate of 400 r / min for 12 h. After the reaction was completed, the reaction product was centrifuged, and the precipitate was washed with distilled water for 5 times, and then placed in a vacuum drying oven and dried at a temperature of 75° C. for 3 h to obtain thiol carbon nanotubes;

[0072] Step S7: 3 g of mercapto carbon nanotubes, 10 g of glycidyl methacrylate and 80 mL of anhydrous tetrahydrofuran were added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and nitrogen was introduced for protection. The mixture was stirred at 30° C. and a stirring rate of 400 r / min for 2 h, and then the mixture was heated to 50° C. and stirred for 6 h. After the reaction, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with distilled water for 5 times, and then placed in a vacuum drying oven and dried at 55° C. for 6 h to obtain enhanced modified carbon nanotubes.

[0073] Step S8: 90 parts of polytetrafluoroethylene resin, 16 parts of carbon black, 4.1 parts of reinforced modified carbon nanotubes, 0.9 parts of sodium dodecylbenzene sulfonate, 3 parts of magnesium stearate and 55 parts of anhydrous ethanol were weighed according to weight parts and set aside;

[0074] Step S9: adding polytetrafluoroethylene resin, carbon black, reinforced modified carbon nanotubes, sodium dodecylbenzene sulfonate, magnesium stearate and anhydrous ethanol into a mixer, stirring and mixing for 8 hours at a temperature of 50° C. and a stirring rate of 600 r / min, and then placing in a vacuum drying oven and drying for 10 hours at a temperature of 85° C. to obtain a mixed material;

[0075] Step S10: adding the mixed material into the mold, and then maintaining the pressure for 60 minutes under the condition of 55 MPa to obtain a pipe blank;

[0076] Step S11: placing the tube blank in a muffle furnace, heating it to 380° C. at a heating rate of 35° C. / h and sintering it for 3 hours, then cooling it in the furnace and taking it out of the mold to obtain a high-performance polytetrafluoroethylene tube modified with carbon nanotubes.

[0077] Comparative Example 1:

[0078] This comparative example is a method for preparing a high-performance polytetrafluoroethylene tube modified with carbon nanotubes, comprising the following steps:

[0079] Step S1: weigh 90 parts of polytetrafluoroethylene resin, 16 parts of carbon black, 0.9 parts of sodium dodecylbenzene sulfonate, 3 parts of magnesium stearate and 55 parts of anhydrous ethanol according to weight parts, and set aside;

[0080] Step S2: adding polytetrafluoroethylene resin, carbon black, sodium dodecylbenzene sulfonate, magnesium stearate and anhydrous ethanol into a mixer, stirring and mixing for 8 hours at a temperature of 50° C. and a stirring rate of 600 r / min, and then placing in a vacuum drying oven and drying for 10 hours at a temperature of 85° C. to obtain a mixed material;

[0081] Step S3: adding the mixed material into the mold, and then maintaining the pressure for 60 minutes under the condition of 55 MPa to obtain a pipe blank;

[0082] Step S4: placing the tube blank in a muffle furnace, heating it to 380° C. at a heating rate of 35° C. / h and sintering it for 3 hours, then cooling it in the furnace and taking it out of the mold to obtain a high-performance polytetrafluoroethylene tube modified with carbon nanotubes.

[0083] Comparative Example 2:

[0084] This comparative example is a method for preparing a high-performance polytetrafluoroethylene tube modified with carbon nanotubes, comprising the following steps:

[0085] Step S1: weigh 90 parts of polytetrafluoroethylene resin, 16 parts of carbon black, 4.1 parts of multi-walled carbon nanotubes, 0.9 parts of sodium dodecylbenzene sulfonate, 3 parts of magnesium stearate and 55 parts of anhydrous ethanol according to weight parts, and set aside;

[0086] Step S2: adding polytetrafluoroethylene resin, carbon black, multi-walled carbon nanotubes, sodium dodecylbenzene sulfonate, magnesium stearate and anhydrous ethanol into a mixer, stirring and mixing for 8 hours at a temperature of 50° C. and a stirring rate of 600 r / min, and then placing in a vacuum drying oven and drying for 10 hours at a temperature of 85° C. to obtain a mixed material;

[0087] Step S3: adding the mixed material into the mold, and then maintaining the pressure for 60 minutes under the condition of 55 MPa to obtain a pipe blank;

[0088] Step S4: placing the tube blank in a muffle furnace, heating it to 380° C. at a heating rate of 35° C. / h and sintering it for 3 hours, then cooling it in the furnace and taking it out of the mold to obtain a high-performance polytetrafluoroethylene tube modified with carbon nanotubes.

[0089] Comparative Example 3:

[0090] This comparative example is a method for preparing a high-performance polytetrafluoroethylene tube modified with carbon nanotubes, comprising the following steps:

[0091] Step S1: 5 g of multi-walled carbon nanotubes, 80 mL of concentrated sulfuric acid with a mass fraction of 98%, and 35 mL of concentrated nitric acid with a mass fraction of 68% are added to a three-necked flask equipped with a stirrer, a thermometer, and a gas guide tube, and nitrogen is introduced for protection. The mixture is stirred and reacted for 3 hours at a temperature of 30° C. and a stirring rate of 400 r / min, and then the mixture is heated to 135° C. and stirred and reacted for 4 hours. After the reaction is completed, the reaction product is cooled to room temperature, and then vacuum filtered. The filter cake is washed with distilled water for 5 times, and then placed in a vacuum drying oven and dried at a temperature of 65° C. for 3 hours to obtain oxidized carbon nanotubes;

[0092] Step S2: 5 g of oxidized carbon nanotubes, 3 g of γ-methacryloxypropyltrimethoxysilane, 10 mL of a 12% hydrochloric acid solution by mass, and 100 mL of an ethanol solution by volume with a 90% ethanol solution are added to a three-necked flask equipped with a stirrer, a thermometer, and an air guide tube, and nitrogen is introduced for protection. The mixture is stirred for reaction at a temperature of 30° C. and a stirring rate of 400 r / min for 15 min, and then the mixture is heated to 85° C. and stirred for reaction for 5 h. After the reaction is completed, the reaction product is cooled to room temperature and then centrifuged. The precipitate is washed with anhydrous ethanol for 5 times, and then placed in a vacuum drying oven and dried at a temperature of 75° C. for 3 h to obtain olefinic carbon nanotubes;

[0093] Step S3: 90 parts of polytetrafluoroethylene resin, 16 parts of carbon black, 4.1 parts of alkenyl carbon nanotubes, 0.9 parts of sodium dodecylbenzene sulfonate, 3 parts of magnesium stearate and 55 parts of anhydrous ethanol were weighed according to weight parts and set aside;

[0094] Step S4: adding polytetrafluoroethylene resin, carbon black, alkenyl carbon nanotubes, sodium dodecylbenzene sulfonate, magnesium stearate and anhydrous ethanol into a mixer, stirring and mixing for 8 hours at a temperature of 50° C. and a stirring rate of 600 r / min, and then placing in a vacuum drying oven and drying for 10 hours at a temperature of 85° C. to obtain a mixed material;

[0095] Step S5: adding the mixed material into the mold, and then maintaining the pressure for 60 minutes under the condition of 55 MPa to obtain a pipe blank;

[0096] Step S6: placing the tube blank in a muffle furnace, heating it to 380° C. at a heating rate of 35° C. / h and sintering it for 3 hours, then cooling it in the furnace and taking it out of the mold to obtain a high-performance polytetrafluoroethylene tube modified with carbon nanotubes.

[0097] The performance of the high-performance polytetrafluoroethylene tubes modified with carbon nanotubes in Examples 1-3 and Comparative Examples 1-3 was tested, and the test results are shown in the following table:

[0098] Test samples Compressive strength, MPa Tensile strength, MPa Flexural modulus, MPa Rockwell hardness Example 1 31.8 53.1 789 91 Example 2 33.0 53.9 801 95 Example 3 34.3 54.8 815 98 Comparative Example 1 20.6 29.8 672 50 Comparative Example 2 26.9 40.5 756 84 Comparative Example 3 28.4 44.2 778 87

[0099] Referring to the data in the above table, based on the comparison between Examples 1-3 and Comparative Examples 1-3, it can be known that the high-performance polytetrafluoroethylene tube modified based on carbon nanotubes of the present application has excellent mechanical properties and wear resistance.

[0100] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0101] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined in this application, they shall all fall within the protection scope of the present invention.

Claims

1. A high-performance polytetrafluoroethylene tube modified with carbon nanotubes, characterized in that: It comprises the following components in parts by weight: 80-90 parts of polytetrafluoroethylene resin, 8-16 parts of carbon black, 1.3-4.1 parts of reinforced modified carbon nanotubes, 0.3-0.9 parts of sodium dodecylbenzene sulfonate, 1-3 parts of magnesium stearate and 50-55 parts of anhydrous ethanol; Wherein, the enhanced modified carbon nanotubes are prepared by the following steps: Step s1: stirring carbon nanotubes, concentrated sulfuric acid and concentrated nitric acid for reaction, cooling the reaction product after the reaction is completed, and then vacuum filtering, washing and drying the filter cake to obtain oxidized carbon nanotubes; Step s2: stirring the oxidized carbon nanotubes, γ-methacryloxypropyltrimethoxysilane, hydrochloric acid solution and ethanol solution for reaction, cooling the reaction product after the reaction is completed, and then centrifuging it, washing and drying the precipitate to obtain olefinic carbon nanotubes; Step s3: stirring 4-hydroxybenzaldehyde, triethylamine, N,N-dimethylaminopyridine and anhydrous tetrahydrofuran for reaction, then adding the hexachlorocyclotriphosphazene solution dropwise while stirring, and continuing to stir the reaction after the addition is complete. After the reaction is completed, the reaction product is cooled, then rotary evaporated and recrystallized to obtain a polyaldehyde intermediate; Step s4: stirring the polyaldehyde intermediate, sodium borohydride, anhydrous methanol and anhydrous tetrahydrofuran for reaction, adding the reaction product to a hydrochloric acid solution after the reaction is completed, and then letting it stand and adjusting the pH with a sodium hydroxide solution, and then vacuum filtering, and rotary evaporating the filtrate to obtain a polyhydroxymethyl intermediate; Step s5: stirring the polyhydroxymethyl intermediate, mercaptopropionic acid, p-toluenesulfonic acid and anhydrous toluene to react, cooling the reaction product after the reaction is completed, then washing and drying, and then vacuum filtering, and rotary evaporating the filtrate to obtain a polythiol intermediate; Step s6: stirring the olefinic carbon nanotubes, the polythiol intermediate and anhydrous tetrahydrofuran for reaction, centrifuging the reaction product after the reaction is completed, washing and drying the precipitate to obtain the thiol carbon nanotubes; Step s7: stirring the mercapto carbon nanotubes, glycidyl methacrylate and anhydrous tetrahydrofuran for reaction, cooling the reaction product after the reaction is completed, and then centrifuging it, washing and drying the precipitate to obtain enhanced modified carbon nanotubes.

2. The high-performance polytetrafluoroethylene tube modified by carbon nanotubes according to claim 1, characterized in that: The usage ratio of the carbon nanotubes, concentrated sulfuric acid and concentrated nitric acid in step s1 is 5g:75-80mL:30-35mL; the carbon nanotubes are multi-walled carbon nanotubes with an outer diameter of 15-25nm and a tube length of 5-15μm; the mass fraction of the concentrated sulfuric acid is 98%; the mass fraction of the concentrated nitric acid is 68%.

3. The high-performance polytetrafluoroethylene tube modified by carbon nanotubes according to claim 1, characterized in that: The dosage ratio of the oxidized carbon nanotubes, γ-methacryloxypropyltrimethoxysilane, hydrochloric acid solution and ethanol solution in step s2 is 5g:1-3g:8-10mL:90-100mL; the mass fraction of the hydrochloric acid solution is 10-12%; the volume fraction of the ethanol solution is 85-90%.

4. The high-performance polytetrafluoroethylene tube modified by carbon nanotubes according to claim 1, characterized in that: The dosage ratio of the 4-hydroxybenzaldehyde, triethylamine, N,N-dimethylaminopyridine, anhydrous tetrahydrofuran and hexachlorocyclotriphosphazene solution in step s3 is 25-30mmol:4-5mL:0.12-0.16g:15-20mL:10mL; the hexachlorocyclotriphosphazene solution is a solution formed by dissolving hexachlorocyclotriphosphazene in anhydrous tetrahydrofuran at a ratio of 3-4mmol:10mL.

5. The high-performance polytetrafluoroethylene tube modified by carbon nanotubes according to claim 1, characterized in that: The dosage ratio of the polyaldehyde intermediate, sodium borohydride, anhydrous methanol and anhydrous tetrahydrofuran in step s4 is 10 mmol: 80-90 mmol: 25-30 mL: 80-90 mL; the mass fraction of the hydrochloric acid solution is 5-7%; and the mass fraction of the sodium hydroxide solution is 10-15%.

6. The high-performance polytetrafluoroethylene tube modified by carbon nanotubes according to claim 1, characterized in that: The usage ratio of the polymethylol intermediate, mercaptopropionic acid, p-toluenesulfonic acid and anhydrous toluene in step s5 is 10mmol:70-80mmol:0.5-0.9g:100-120mL; the mass fraction of the sodium hydroxide solution is 5-7%.

7. The high-performance polytetrafluoroethylene tube modified by carbon nanotubes according to claim 1, characterized in that: The usage ratio of the alkenyl carbon nanotubes, the polythiol intermediate and anhydrous tetrahydrofuran in step s6 is 5 g: 2-8 mmol: 80-100 mL.

8. The high-performance polytetrafluoroethylene tube modified by carbon nanotubes according to claim 1, characterized in that: The usage ratio of the mercapto carbon nanotubes, glycidyl methacrylate and anhydrous tetrahydrofuran in step s7 is 3g:2-10g:70-80mL.

9. A method for preparing high-performance polytetrafluoroethylene tubes modified with carbon nanotubes, characterized in that: The following steps are involved: Step 1: Weigh 80-90 parts of polytetrafluoroethylene resin, 8-16 parts of carbon black, 1.3-4.1 parts of reinforced modified carbon nanotubes, 0.3-0.9 parts of sodium dodecylbenzene sulfonate, 1-3 parts of magnesium stearate and 50-55 parts of anhydrous ethanol according to weight parts, and set aside; Step 2: adding polytetrafluoroethylene resin, carbon black, reinforced modified carbon nanotubes, sodium dodecylbenzene sulfonate, magnesium stearate and anhydrous ethanol into a mixer, stirring and mixing for 6-8 hours at a temperature of 45-50° C. and a stirring rate of 500-600 r / min, and then placing in a vacuum drying oven, drying for 8-10 hours at a temperature of 80-85° C. to obtain a mixed material; Step 3: Add the mixed material into the mold, and then maintain the pressure for 40-60 minutes at a pressure of 35-55 MPa to obtain a pipe blank; Step 4: Place the tube blank in a muffle furnace, heat it to 360-380°C at a heating rate of 30-35°C / h and sinter it for 2-3h, then cool it in the furnace and take it out of the mold to obtain a high-performance polytetrafluoroethylene tube modified with carbon nanotubes.