A high-temperature resistant power tube and its production process

Abstract

The present invention discloses a high-temperature resistant power tube and its production process, belonging to the technical field of power tube preparation. The high-temperature resistant power tube is composed of the following components in parts by weight: 60-80 parts of high-temperature resistant base material, 10-30 parts of carbon fiber, and 1-5 parts of modified anti-aging agent. Among them, the high-temperature resistant base material is prepared from 2,3,4-trifluorobenzaldehyde, malonic acid, naphthalenepropionic acid, trifluoroacetic anhydride, and 2,2-bis[4-(4-aminophenoxy)phenyl]propane, and the modified anti-aging agent is prepared from absolute ethanol, paeonol, sodium hydroxide, and 2-methoxybenzaldehyde. The power tube prepared by this method has excellent high-temperature resistance, mechanical properties, and anti-aging properties.

Description

Technical Field

[0001] The present invention belongs to the technical field of power pipe preparation, and particularly relates to a high-temperature resistant power pipe and its production process. Background Art

[0002] With the rapid development of modern industry, the requirements for the material properties of power transmission systems are increasing day by day. Especially in extreme environments such as high temperature, high pressure, and strong corrosion, traditional power pipe materials are difficult to meet the demands. As a key basic material, high-temperature resistant power pipes are widely used in fields such as power, petrochemical, aerospace, and automotive manufacturing, and their performance is directly related to the safety and stability of power systems.

[0003] Traditional power pipe materials, such as polyvinyl chloride, polyethylene, and polypropylene, although having good electrical insulation properties and processing properties at room temperature, have poor high-temperature resistance. The long-term service temperature usually does not exceed 80°C to 100°C. In high-temperature environments, these materials are prone to softening, deformation, and even degradation, resulting in a decline in mechanical properties, thus affecting the safe operation of power systems. In addition, the chemical stability of traditional materials in strongly corrosive environments is also poor, restricting their application in fields such as chemical engineering and petroleum. Therefore, it has become an urgent need to develop power pipe materials that can work stably in high-temperature environments and have excellent comprehensive properties.

[0004] Patent CN104086919B discloses a high-temperature resistant power protection pipe, and its raw materials by weight include: 100 - 150 parts of polyvinyl chloride, 50 - 100 parts of chlorinated polyvinyl chloride, 5 - 15 parts of glass microspheres, 10 - 25 parts of acrylate rubber, 2 - 6 parts of lanthanum ricinoleate, 1 - 5 parts of lauryl gallate, 2 - 5 parts of synergistic stabilizer, 20 - 30 parts of heat-resistant modifier, 0.5 - 1.5 parts of polyethylene wax, 5 - 30 parts of modified feldspar, 10 - 20 parts of composite toughening modifier, and 20 - 60 parts of flame retardant. The high-temperature resistant power protection pipe prepared by this invention has excellent high-temperature resistance, and at the same time has good corrosion resistance, aging resistance, flame retardancy, high mechanical strength and toughness. However, there is still room for improvement in the high-temperature resistance, aging resistance, and mechanical properties of the power protection pipe prepared by this method. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-temperature resistant power pipe and its production process, which are used to solve the technical problems of poor high-temperature resistance, aging resistance, and mechanical properties of power pipes in the prior art.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] The present invention provides a high-temperature resistant power tube, which is composed of the following components in parts by weight: 60-80 parts of high-temperature resistant base material, 10-30 parts of carbon fiber, and 1-5 parts of modified anti-aging agent. Among them, the high-temperature resistant base material is prepared from 2,3,4-trifluorobenzaldehyde, malonic acid, naphthoxypropionic acid, trifluoroacetic anhydride, and 2,2-bis[4-(4-aminophenoxy)phenyl]propane, and the modified anti-aging agent is prepared from absolute ethanol, paeonol, sodium hydroxide, and 2-methoxybenzaldehyde.

[0008] Preferably, the preparation method of the high-temperature resistant base material includes the following steps:

[0009] Q1: Add 2,3,4-trifluorobenzaldehyde, malonic acid, piperidine, and pyridine into a container in sequence, heat for reaction. After the reaction is completed, add an ice-water mixture, cool, filter by suction, wash, distill under reduced pressure, recrystallize, and dry to obtain Compound 1; add naphthoxypropionic acid into a container filled with glacial acetic acid. Under an ice bath environment, add hydrobromic acid, heat for reflux reaction. After the reaction is completed, add an ice-water mixture, filter by suction and dry to obtain Compound 2;

[0010] Q2: Add Compound 2 into tetrahydrofuran, ultrasonically oscillate, cool and stir in an ice bath, then add trifluoroacetic anhydride, react in an ice bath. After the reaction is completed, add tert-butanol, slowly warm up to room temperature for reaction. After the reaction is completed, cool and stir, add ammonia water, warm up to quench the reaction, distill under reduced pressure, extract, collect the organic phase, wash, dry, distill to dryness under reduced pressure, recrystallize to obtain Compound 3;

[0011] Q3: Add Compound 1, Compound 3, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, and 4-dimethylaminopyridine into a container filled with dichloromethane in sequence, react at room temperature. After the reaction is completed, wash, dry, distill under reduced pressure, recrystallize to obtain Compound 4; add Compound 4 into dichloromethane, stir in an ice bath, then add trifluoroacetic acid, warm up to room temperature for reaction. After the reaction is completed, add dichloromethane, wash the organic phase, dry, distill under reduced pressure, recrystallize to obtain Compound 5;

[0012] Q4: Add Compound 5 and 2,2-bis[4-(4-aminophenoxy)phenyl]propane into a container filled with N-methylpyrrolidone, stir, then add lithium chloride, triphenyl phosphite, and pyridine, introduce nitrogen, heat for reaction. After the reaction is completed, pour it into methanol, soak, crush, boil, wash, and vacuum dry to obtain the high-temperature resistant base material.

[0013] In the above process, 2,3,4-trifluorobenzaldehyde and malonic acid are condensed under the catalysis of piperidine and pyridine to obtain Compound 1. Under acidic conditions, the methoxy group of naproxen is replaced by hydrobromic acid to form a hydroxyl group, resulting in Compound 2. Subsequently, Compound 2 reacts with trifluoroacetic anhydride and tert-butanol to obtain Compound 3. Then, Compound 3 undergoes an esterification reaction with Compound 1 to prepare Compound 4. Compound 4 is hydrolyzed using trifluoroacetic acid to remove the tert-butyl ester group, yielding Compound 5. Compound 5 undergoes a polymerization reaction with 2,2-bis[4-(4-aminophenoxy)phenyl]propane to obtain a high-temperature resistant substrate. The synthesis reaction formula of the high-temperature resistant substrate is as follows:

[0014]

[0015] The results of mass spectrometry analysis of Compound 1 are: m / z: 202.02 (100.0%), 203.03 (9.9%); the results of mass spectrometry analysis of Compound 2 are: m / z: 216.08 (100.0%), 217.08 (14.3%); the results of mass spectrometry analysis of Compound 3 are: m / z: 272.14 (100.0%), 273.14 (18.4%), 274.15 (2.3%); the results of mass spectrometry analysis of Compound 4 are: m / z: 456.15 (100.0%), 457.16 (28.5%), 458.16 (4.7%); the results of mass spectrometry analysis of Compound 5 are: m / z: 400.09 (100.0%), 401.10 (24.1%), 402.10 (3.6%).

[0016] Preferably, in Q1, the molar ratio of 2,3,4-trifluorobenzaldehyde, malonic acid, piperidine, and pyridine is (1 - 1.2):(2 - 2.4):(0.5 - 0.8):(10 - 12), the heating reaction temperature is 90 - 110°C, and the reaction time is 1 - 3 h; the dosage ratio of naproxen, glacial acetic acid, and hydrobromic acid is (10 - 15) g:(50 - 75) mL:(25 - 35) mL, the volume fraction of hydrobromic acid is 48 vt%, the heating reflux reaction temperature is 110 - 130°C, and the reaction time is 3 - 5 h.

[0017] Preferably, in Q2, the dosage ratio of compound 2, tetrahydrofuran, trifluoroacetic anhydride, tert-butanol and ammonia water is (8 - 10) g : (180 - 220) mL : (25 - 30) mL : (50 - 60) mL : (15 - 18) mL, the cooling and stirring time is 15 - 30 min, the ice bath reaction time is 4 - 6 h, the room temperature reaction time is 10 - 12 h, the cooling and stirring time is 15 - 25 min, the volume fraction of ammonia water is 28 vt%, the quenching reaction is 30 - 45 min, it is washed with saturated sodium bicarbonate, dried with anhydrous sodium sulfate, and recrystallized with absolute ethanol.

[0018] Preferably, in Q3, the molar ratio of compound 1, compound 3, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 4-dimethylaminopyridine is (1 - 1.2) : (1 - 1.2) : (1.2 - 1.5) : (0.2 - 0.25), the room temperature reaction time is 1 - 3 h; the dosage ratio of compound 4 and trifluoroacetic acid is (0.2 - 0.4) g : (1 - 3) mL, the ice bath stirring time is 5 - 10 min, and the room temperature reaction time is 30 - 45 min.

[0019] Preferably, in Q4, the dosage ratio of compound 5, 2,2-bis[4-(4-aminophenoxy)phenyl]propane, N-methylpyrrolidone, lithium chloride, triphenyl phosphite and pyridine is (2.01 - 2.45) g : (3.9 - 4.6) g : (30 - 45) mL : (4.8 - 5.2) g : (8 - 12) mL : (10 - 12) mL, the temperature for the heating reaction is 100 - 120 °C, and the reaction time is 6 - 8 h.

[0020] Preferably, the preparation method of the modified anti-aging agent comprises the following steps:

[0021] S1: Add absolute ethanol to a container for preheating, slowly add paeonol dissolved in absolute ethanol to the container, then add sodium hydroxide, and stir to mix evenly;

[0022] S2: Dissolve 2-methoxybenzaldehyde in absolute ethanol, slowly add it to the container, stir, add absolute ethanol after supplementing, heat and stir, carry out a reflux reaction under heating, after the reaction ends, adjust the pH, add distilled water, carry out an ice bath, filter by suction, and dry to obtain the modified anti-aging agent.

[0023] In the above process, using paeonol as the raw material, a condensation reaction occurs with 2-methoxybenzaldehyde under alkaline conditions to prepare the modified anti-aging agent. Among them, the synthesis reaction formula of the modified anti-aging agent is as follows:

[0024]

[0025] The results of mass spectrometry analysis of the modified anti-aging agent are: m / z: 284.10 (100.0%), 285.11 (18.7%), 286.11 (2.5%).

[0026] Preferably, in S1, the preheating temperature is 40 - 45°C, the preheating time is 10 - 12 min, the dosage ratio of paeonol to sodium hydroxide is (0.42 - 0.54) g : (0.23 - 0.34) g, and the stirring time is 10 - 15 min; in S2, the dosage ratio of 2-methoxybenzaldehyde, absolute ethanol and the additional absolute ethanol is (0.42 - 0.47) g : (5 - 7.5) mL : (10 - 15) mL, the heating and stirring temperature is 40 - 50°C, the time is 10 - 12 h, the temperature for heating under reflux is 60 - 65°C, the time is 3 - 5 h, and the pH is adjusted to 7 with 6 mol / L hydrochloric acid solution.

[0027] Preferably, a production process of a high-temperature resistant power tube includes the following steps:

[0028] Step 1: Mix the high-temperature resistant substrate, carbon fiber and the modified anti-aging agent evenly, heat and melt them, extrude, cool, shape, and anneal to obtain a rough product;

[0029] Step 2: Polish, detect and package the rough product to obtain the high-temperature resistant power tube.

[0030] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

[0031] The present invention first uses 2,3,4-trifluorobenzaldehyde, malonic acid, naproxen, trifluoroacetic anhydride, and 2,2-bis[4-(4-aminophenoxy)phenyl]propane as raw materials to prepare a high-temperature resistant substrate. Subsequently, anhydrous ethanol, paeonol, sodium hydroxide, and 2-methoxybenzaldehyde are used as raw materials to prepare a modified anti-aging agent. Using the high-temperature resistant substrate, carbon fiber, and the modified anti-aging agent as raw materials, a power tube with high-temperature resistance, mechanical properties, and anti-aging properties is prepared. The amide bond contained in the high-temperature resistant substrate has a relatively high bond energy, which can resist thermal decomposition reactions at high temperatures, making it not easily broken in a high-temperature environment and maintaining thermal stability. The introduced fluorine atoms have a relatively large electronegativity, which can disrupt the conjugation of the electron clouds of the chromogenic functional structural groups in the high-temperature resistant substrate, thereby reducing the intermolecular interaction force, making the molecular chain more easily maintain the stability of its structure at high temperatures. Moreover, the presence of fluorine atoms can also increase the distance between molecular chains, further reducing the intermolecular force, and thus improving the high-temperature resistance. The hydrogen bonds contained in the high-temperature resistant substrate can form a tight network structure between molecular chains, increasing the strength and toughness of the material and improving the mechanical strength of the material. The electronegativity of fluorine atoms reduces the electron cloud density on the surface of the molecular chain, reducing the intermolecular interaction force between the molecular chain and the friction surface, improving the wear resistance of the power tube, and increasing its mechanical properties; the hydrogen atom in the phenolic hydroxyl group of the modified anti-aging agent can combine with free radicals to form stable phenoxy free radicals, thereby terminating the free radical chain reaction and protecting the power tube from oxidative damage. Moreover, the π electron cloud in the conjugated system can absorb the energy of ultraviolet light and undergo electronic transitions. After absorbing ultraviolet light, the structure within the conjugated system will change, converting the harmful ultraviolet light energy into harmless heat energy and releasing it or releasing it as non-destructive longer light waves, extending the service life. Detailed implementation mode

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Example 1: This example discloses a preparation method of a high-temperature resistant substrate, including the following steps:

[0034] Q1: 0.88 g of 2,3,4-trifluorobenzaldehyde, 1.144 g of malonic acid, 0.27 g of piperidine and 4.35 g of pyridine were successively added to a container, and the mixture was heated at 90 °C for reaction for 1.5 h. After the reaction, an ice-water mixture was added, cooled, filtered by suction, washed, distilled under reduced pressure, recrystallized, and dried to obtain Compound 1; 12.5 g of naproxen was added to a container containing 62.5 mL of glacial acetic acid. Under an ice bath, 30 mL of hydrobromic acid with a volume fraction of 48 vt% was added, and the mixture was heated under reflux at 120 °C for reaction for 4 h. After the reaction, an ice-water mixture was added, filtered by suction and dried to obtain Compound 2;

[0035] Q2: 9 g of Compound 2 was added to 200 mL of tetrahydrofuran, ultrasonically oscillated, and cooled and stirred in an ice bath for 30 min. Then 27.5 mL of trifluoroacetic anhydride was added, and the reaction was carried out in an ice bath for 6 h. After the reaction, 55 mL of tert-butanol was added, and the temperature was slowly raised to room temperature for reaction for 12 h. After the reaction, it was cooled and stirred for 15 min, 16.5 mL of ammonia water with a volume fraction of 28 vt% was added, and the reaction was quenched by heating for 45 min. It was distilled under reduced pressure, extracted, the organic phase was collected, washed with saturated sodium bicarbonate, dried with anhydrous sodium sulfate, evaporated to dryness under reduced pressure, and recrystallized with absolute ethanol to obtain Compound 3;

[0036] Q3: 0.94 g of Compound 1, 1.5 g of Compound 3, 1.3 g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 0.13 g of 4-dimethylaminopyridine were successively added to a container containing dichloromethane, and the reaction was carried out at room temperature for 2 h. After the reaction, it was washed, dried, distilled under reduced pressure, and recrystallized to obtain Compound 4; 0.3 g of Compound 4 was added to 5 mL of dichloromethane, stirred in an ice bath for 10 min, then 2 mL of trifluoroacetic acid was added, and the temperature was raised to room temperature for reaction for 45 min. After the reaction, dichloromethane was added, the organic phase was washed, dried, distilled under reduced pressure, and recrystallized to obtain Compound 5;

[0037] Q4: 2.23 g of Compound 5 and 4.2 g of 2,2-bis[4-(4-aminophenoxy)phenyl]propane were added to a container containing 37.5 mL of N-methylpyrrolidone, stirred, then 5 g of lithium chloride, 10 mL of triphenyl phosphite and 11 mL of pyridine were added, nitrogen was introduced, and the temperature was raised to 110 °C for reaction for 8 h. After the reaction, it was poured into methanol, soaked, crushed, boiled, washed, and dried under vacuum to obtain a high-temperature resistant substrate.

[0038] This example discloses a preparation method of a modified anti-aging agent, comprising the following steps:

[0039] S1: Add 15 mL of absolute ethanol into a container, preheat it at 45 °C for 12 min, slowly add 0.48 g of paeonol dissolved in 5 mL of absolute ethanol into the container, then add 0.28 g of sodium hydroxide, stir for 15 min, and mix evenly.

[0040] S2: Dissolve 0.45 g of 2 - methoxybenzaldehyde in 6.25 mL of absolute ethanol, slowly add it into the container, stir, add 12.5 mL of absolute ethanol after supplementing, heat and stir at 45 °C for 12 h, raise the temperature to 65 °C and reflux for 5 h. After the reaction is completed, adjust the pH to 7 with 6 mol / L hydrochloric acid solution, add distilled water, cool in an ice bath, filter by suction, dry, and obtain the modified anti - aging agent.

[0041] This example discloses a high - temperature resistant power tube, which is composed of the following components in parts by weight: 70 parts of high - temperature resistant base material, 20 parts of carbon fiber, and 3 parts of modified anti - aging agent.

[0042] This example discloses a production process of a high - temperature resistant power tube, including the following steps:

[0043] Step 1: Mix the high - temperature resistant base material, carbon fiber, and modified anti - aging agent evenly, heat and melt, extrude, cool, shape, and perform annealing treatment to obtain a crude product.

[0044] Step 2: Polish, detect, and package the crude product to obtain the high - temperature resistant power tube.

[0045] Example 2: This example discloses a preparation method of a high - temperature resistant base material, including the following steps:

[0046] Q1: Add 0.8 g of 2,3,4 - trifluorobenzaldehyde, 1.04 g of malonic acid, 0.21 g of piperidine, and 3.95 g of pyridine into a container in sequence, heat and react at 90 °C for 1.5 h. After the reaction is completed, add an ice - water mixture, cool, filter by suction, wash, distill under reduced pressure, recrystallize, and dry to obtain Compound 1; add 10 g of naphthoxypropionic acid into a container containing 50 mL of glacial acetic acid, add 25 mL of hydrobromic acid with a volume fraction of 48 vt% under an ice - bath environment, heat and reflux at 120 °C for 4 h. After the reaction is completed, add an ice - water mixture, filter by suction and dry to obtain Compound 2.

[0047] Q2: Add 8 g of Compound 2 to 180 mL of tetrahydrofuran, ultrasonically oscillate, cool in an ice bath and stir for 30 min, then add 25 mL of trifluoroacetic anhydride, react in an ice bath for 6 h. After the reaction is completed, add 50 mL of tert-butanol, slowly warm up to room temperature and react for 12 h. After the reaction is completed, cool and stir for 15 min, add 15 mL of ammonia water with a volume fraction of 28 vt%, warm up to quench the reaction for 45 min, distill under reduced pressure, extract, collect the organic phase, wash with saturated sodium bicarbonate, dry with anhydrous sodium sulfate, evaporate to dryness under reduced pressure, and recrystallize with absolute ethanol to obtain Compound 3;

[0048] Q3: Add 0.9 g of Compound 1, 1.36 g of Compound 3, 1.15 g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 0.122 g of 4-dimethylaminopyridine to a container containing dichloromethane in sequence, react at room temperature for 2 h. After the reaction is completed, wash, dry, distill under reduced pressure, and recrystallize to obtain Compound 4; Add 0.2 g of Compound 4 to 5 mL of dichloromethane, stir in an ice bath for 10 min, then add 1 mL of trifluoroacetic acid, warm up to room temperature and react for 45 min. After the reaction is completed, add dichloromethane, wash the organic phase, dry, distill under reduced pressure, and recrystallize to obtain Compound 5;

[0049] Q4: Add 2.01 g of Compound 5 and 3.9 g of 2,2-bis[4-(4-aminophenoxy)phenyl]propane to a container containing 30 mL of N-methylpyrrolidone, stir, then add 4.8 g of lithium chloride, 8 mL of triphenyl phosphite and 10 mL of pyridine, introduce nitrogen, heat up to 110 °C and react for 8 h. After the reaction is completed, pour it into methanol, soak, crush, boil, wash, and vacuum dry to obtain a high-temperature resistant substrate.

[0050] This example discloses a preparation method of a modified anti-aging agent, including the following steps:

[0051] S1: Add 15 mL of absolute ethanol to a container, preheat at 45 °C for 12 min, slowly add 0.42 g of paeonol dissolved in 5 mL of absolute ethanol to the container, then add 0.23 g of sodium hydroxide, stir for 15 min, and mix evenly;

[0052] S2: Dissolve 0.42 g of 2-methoxybenzaldehyde in 5 mL of absolute ethanol, slowly add it to the container, stir, add 10 mL of absolute ethanol after supplementing, heat and stir at 45 °C for 12 h, heat up to 65 °C and reflux for 5 h. After the reaction is completed, adjust the pH = 7 with 6 mol / L hydrochloric acid solution, add distilled water, cool in an ice bath, filter by suction, dry to obtain the modified anti-aging agent.

[0053] This embodiment discloses a high-temperature resistant power tube, which is composed of the following components in parts by weight: 60 parts of high-temperature resistant base material, 10 parts of carbon fiber, and 1 part of modified anti-aging agent.

[0054] This embodiment discloses a production process of a high-temperature resistant power tube, including the following steps:

[0055] Step 1: Mix the high-temperature resistant base material, carbon fiber, and modified anti-aging agent evenly, heat and melt them, extrude, cool, shape, and anneal to obtain a rough product;

[0056] Step 2: Polish, detect, and package the rough product to obtain a high-temperature resistant power tube.

[0057] Example 3: This embodiment discloses a preparation method of a high-temperature resistant base material, including the following steps:

[0058] Q1: Add 0.96 g of 2,3,4-trifluorobenzaldehyde, 1.248 g of malonic acid, 0.34 g of piperidine, and 4.74 g of pyridine into a container in sequence, heat and react at 90 °C for 1.5 h. After the reaction, add an ice-water mixture, cool, filter by suction, wash, distill under reduced pressure, recrystallize, and dry to obtain Compound 1; Add 15 g of naproxen into a container containing 75 mL of glacial acetic acid. Under an ice bath environment, add 35 mL of hydrobromic acid with a volume fraction of 48 vt%, heat and reflux at 120 °C for 4 h. After the reaction, add an ice-water mixture, filter by suction and dry to obtain Compound 2;

[0059] Q2: Add 10 g of Compound 2 into 220 mL of tetrahydrofuran, ultrasonically oscillate, cool and stir in an ice bath for 30 min, then add 30 mL of trifluoroacetic anhydride, react in an ice bath for 6 h. After the reaction, add 60 mL of tert-butanol, slowly warm up to room temperature and react for 12 h. After the reaction, cool and stir for 15 min, add 18 mL of ammonia water with a volume fraction of 28 vt%, warm up to quench the reaction for 45 min, distill under reduced pressure, extract, collect the organic phase, wash with saturated sodium bicarbonate, dry with anhydrous sodium sulfate, distill to dryness under reduced pressure, and recrystallize with absolute ethanol to obtain Compound 3;

[0060] Q3: Add 1.08 g of Compound 1, 1.63 g of Compound 3, 1.44 g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, and 0.15 g of 4-dimethylaminopyridine into a container containing dichloromethane in sequence, react at room temperature for 2 h. After the reaction, wash, dry, distill under reduced pressure, and recrystallize to obtain Compound 4; Add 0.4 g of Compound 4 into 5 mL of dichloromethane, stir in an ice bath for 10 min, then add 3 mL of trifluoroacetic acid, warm up to room temperature and react for 45 min. After the reaction, add dichloromethane, wash the organic phase, dry, distill under reduced pressure, and recrystallize to obtain Compound 5;

[0061] Q4: 2.45 g of Compound 5 and 4.6 g of 2,2-bis[4-(4-aminophenoxy)phenyl]propane were added to a container containing 45 mL of N-methylpyrrolidone, stirred, and then 5.2 g of lithium chloride, 12 mL of triphenyl phosphite, and 12 mL of pyridine were added. Nitrogen was introduced, and the temperature was raised to 110 °C for reaction for 8 h. After the reaction was completed, it was poured into methanol, soaked, crushed, boiled, washed, and vacuum dried to obtain a high-temperature resistant substrate.

[0062] This example discloses a preparation method of a modified anti-aging agent, including the following steps:

[0063] S1: 15 mL of anhydrous ethanol was added to a container and preheated at 45 °C for 12 min. 0.54 g of paeonol dissolved in 5 mL of anhydrous ethanol was slowly added to the container, and then 0.34 g of sodium hydroxide was added, and stirred for 15 min to mix evenly;

[0064] S2: 0.47 g of 2-methoxybenzaldehyde was dissolved in 7.5 mL of anhydrous ethanol, slowly added to the container, stirred, and after adding 15 mL of anhydrous ethanol, heated and stirred at 45 °C for 12 h, the temperature was raised to 65 °C for reflux reaction for 5 h. After the reaction was completed, the pH was adjusted to 7 with 6 mol / L hydrochloric acid solution, distilled water was added, ice bath was carried out, suction filtration was carried out, and drying was carried out to obtain a modified anti-aging agent.

[0065] This example discloses a high-temperature resistant power tube, which is composed of the following components in parts by weight: 80 parts of high-temperature resistant substrate, 30 parts of carbon fiber, and 5 parts of modified anti-aging agent.

[0066] This example discloses a production process of a high-temperature resistant power tube, including the following steps:

[0067] Step 1: The high-temperature resistant substrate, carbon fiber, and modified anti-aging agent were mixed evenly, heated and melted, extruded, cooled, shaped, and annealed to obtain a rough product;

[0068] Step 2: The rough product was polished, tested, and packaged to obtain a high-temperature resistant power tube.

[0069] Example 4: This example discloses a preparation method of a high-temperature resistant substrate, including the following steps:

[0070] Q1: 0.82 g of 2,3,4-trifluorobenzaldehyde, 1.09 g of malonic acid, 0.24 g of piperidine and 4.17 g of pyridine were successively added to a container, and the reaction was carried out at 90 °C for 1.5 h. After the reaction was completed, an ice-water mixture was added, cooled, filtered by suction, washed, distilled under reduced pressure, recrystallized, and dried to obtain Compound 1; 11 g of naproxen was added to a container containing 55 mL of glacial acetic acid. Under an ice bath, 27 mL of hydrobromic acid with a volume fraction of 48 vt% was added, and the reaction was refluxed at 120 °C for 4 h. After the reaction was completed, an ice-water mixture was added, filtered by suction and dried to obtain Compound 2;

[0071] Q2: 8.5 g of Compound 2 was added to 190 mL of tetrahydrofuran, ultrasonically oscillated, cooled and stirred in an ice bath for 30 min, then 26 mL of trifluoroacetic anhydride was added, and the reaction was carried out in an ice bath for 6 h. After the reaction was completed, 52 mL of tert-butanol was added, and the temperature was slowly raised to room temperature and reacted for 12 h. After the reaction was completed, it was cooled and stirred for 15 min, 16 mL of ammonia water with a volume fraction of 28 vt% was added, and the reaction was quenched by heating for 45 min. It was distilled under reduced pressure, extracted, the organic phase was collected, washed with saturated sodium bicarbonate, dried with anhydrous sodium sulfate, evaporated to dryness under reduced pressure, and recrystallized with absolute ethanol to obtain Compound 3;

[0072] Q3: 0.92 g of Compound 1, 1.41 g of Compound 3, 1.23 g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 0.135 g of 4-dimethylaminopyridine were successively added to a container containing dichloromethane, and the reaction was carried out at room temperature for 2 h. After the reaction was completed, it was washed, dried, distilled under reduced pressure, and recrystallized to obtain Compound 4; 0.25 g of Compound 4 was added to 5 mL of dichloromethane, stirred in an ice bath for 10 min, then 1.5 mL of trifluoroacetic acid was added, and the temperature was raised to room temperature and reacted for 45 min. After the reaction was completed, dichloromethane was added, the organic phase was washed, dried, distilled under reduced pressure, and recrystallized to obtain Compound 5;

[0073] Q4: 2.12 g of Compound 5 and 4.1 g of 2,2-bis[4-(4-aminophenoxy)phenyl]propane were added to a container containing 32 mL of N-methylpyrrolidone, stirred, then 4.9 g of lithium chloride, 9 mL of triphenyl phosphite and 10.5 mL of pyridine were added, nitrogen was introduced, and the temperature was raised to 110 °C and reacted for 8 h. After the reaction was completed, it was poured into methanol, soaked, crushed, boiled, washed, and dried under vacuum to obtain a high-temperature resistant substrate.

[0074] This example discloses a preparation method of a modified anti-aging agent, comprising the following steps:

[0075] S1: Add 15 mL of anhydrous ethanol into a container, preheat at 45 °C for 12 min, slowly add 0.46 g of paeonol dissolved in 5 mL of anhydrous ethanol into the container, then add 0.26 g of sodium hydroxide, stir for 15 min, and mix evenly.

[0076] S2: Dissolve 0.43 g of 2-methoxybenzaldehyde in 5.5 mL of anhydrous ethanol, slowly add it into the container, stir, add 11 mL of anhydrous ethanol after supplementing, heat and stir at 45 °C for 12 h, raise the temperature to 65 °C and reflux for 5 h. After the reaction is completed, adjust the pH to 7 with 6 mol / L hydrochloric acid solution, add distilled water, cool in an ice bath, filter by suction, dry, and obtain the modified anti-aging agent.

[0077] This example discloses a high-temperature resistant power tube, which is composed of the following components in parts by weight: 65 parts of high-temperature resistant base material, 15 parts of carbon fiber, and 1.5 parts of modified anti-aging agent.

[0078] This example discloses a production process of a high-temperature resistant power tube, including the following steps:

[0079] Step 1: Mix the high-temperature resistant base material, carbon fiber, and modified anti-aging agent evenly, heat and melt, extrude, cool, shape, and anneal to obtain a crude product.

[0080] Step 2: Polish, detect, and package the crude product to obtain the high-temperature resistant power tube.

[0081] Example 5: This example discloses a preparation method of a high-temperature resistant base material, including the following steps:

[0082] Q1: Add 0.94 g of 2,3,4-trifluorobenzaldehyde, 1.213 g of malonic acid, 0.31 g of piperidine, and 4.52 g of pyridine into a container in sequence, heat and react at 90 °C for 1.5 h. After the reaction is completed, add an ice-water mixture, cool, filter by suction, wash, distill under reduced pressure, recrystallize, and dry to obtain Compound 1; add 14 g of naproxen propionic acid into a container containing 70 mL of glacial acetic acid, add 32 mL of hydrobromic acid with a volume fraction of 48 vt% under an ice bath environment, heat and reflux at 120 °C for 4 h. After the reaction is completed, add an ice-water mixture, filter by suction and dry to obtain Compound 2.

[0083] Q2: Add 9.5 g of Compound 2 to 210 mL of tetrahydrofuran, ultrasonically oscillate, cool in an ice bath and stir for 30 min, then add 29 mL of trifluoroacetic anhydride, react in an ice bath for 6 h. After the reaction is completed, add 58 mL of tert-butanol, slowly warm up to room temperature and react for 12 h. After the reaction is completed, cool and stir for 15 min, add 17 mL of ammonia water with a volume fraction of 28 vt%, warm up to quench the reaction for 45 min, carry out reduced pressure distillation, extraction, collect the organic phase, wash with saturated sodium bicarbonate, dry with anhydrous sodium sulfate, evaporate to dryness under reduced pressure, and recrystallize with absolute ethanol to obtain Compound 3;

[0084] Q3: Add 0.99 g of Compound 1, 1.38 g of Compound 3, 1.38 g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 0.147 g of 4-dimethylaminopyridine to a container filled with dichloromethane in sequence, react at room temperature for 2 h. After the reaction is completed, wash, dry, carry out reduced pressure distillation, and recrystallize to obtain Compound 4; Add 0.35 g of Compound 4 to 5 mL of dichloromethane, stir in an ice bath for 10 min, then add 2.5 mL of trifluoroacetic acid, warm up to room temperature and react for 45 min. After the reaction is completed, add dichloromethane, wash the organic phase, dry, carry out reduced pressure distillation, and recrystallize to obtain Compound 5;

[0085] Q4: Add 2.34 g of Compound 5 and 4.4 g of 2,2-bis[4-(4-aminophenoxy)phenyl]propane to a container filled with 42 mL of N-methylpyrrolidone, stir, then add 5.1 g of lithium chloride, 11 mL of triphenyl phosphite and 11.5 mL of pyridine, introduce nitrogen, heat up to 110 °C and react for 8 h. After the reaction is completed, pour it into methanol, soak, crush, boil, wash, and vacuum dry to obtain a high-temperature resistant substrate.

[0086] This example discloses a preparation method of a modified anti-aging agent, including the following steps:

[0087] S1: Add 15 mL of absolute ethanol to a container, preheat at 45 °C for 12 min, slowly add 0.52 g of paeonol dissolved in 5 mL of absolute ethanol to the container, then add 0.31 g of sodium hydroxide, stir for 15 min to mix evenly;

[0088] S2: Dissolve 0.46 g of 2-methoxybenzaldehyde in 6.5 mL of absolute ethanol, slowly add it to the container, stir, add 14 mL of absolute ethanol after supplementing, heat and stir at 45 °C for 12 h, heat up to reflux at 65 °C and react for 5 h. After the reaction is completed, adjust the pH = 7 with 6 mol / L hydrochloric acid solution, add distilled water, cool in an ice bath, filter by suction, and dry to obtain the modified anti-aging agent.

[0089] This embodiment discloses a high-temperature resistant power tube, which is composed of the following components in parts by weight: 75 parts of high-temperature resistant base material, 25 parts of carbon fiber, and 4 parts of modified anti-aging agent.

[0090] This embodiment discloses a production process of a high-temperature resistant power tube, including the following steps:

[0091] Step 1: Mix the high-temperature resistant base material, carbon fiber, and modified anti-aging agent evenly, heat and melt them, extrude, cool, shape, and anneal to obtain a rough product;

[0092] Step 2: Polish, detect, and package the rough product to obtain a high-temperature resistant power tube.

[0093] Comparative Example 1: Compared with Example 1, in the process of preparing the high-temperature resistant power tube in Comparative Example 1, polyvinyl chloride is used to replace the high-temperature resistant base material, and other conditions remain unchanged.

[0094] Comparative Example 2: Compared with Example 1, in the process of preparing the high-temperature resistant power tube in Comparative Example 2, the modified anti-aging agent is not added, and other conditions remain unchanged.

[0095] Experimental Example: The performance of the power tubes prepared in Examples 1-5 and Comparative Examples 1-2 was tested. The Vicat softening temperature of the samples was measured according to GB / T8802-2001, the tensile yield stress of the samples was tested according to GB / T 8804.1-2003, and the anti-aging performance of the samples was tested according to GB / T 14522-2008. The test results are shown in Table 1:

[0096] Table 1

[0097]

[0098] It can be seen from the test results in Table 1 that the power tubes prepared in Examples 1-5 of the present invention have excellent high-temperature resistance, mechanical properties, and anti-aging properties. By comparing Comparative Example 1 with Examples 1-5, it can be seen that the use of the high-temperature resistant base material can effectively improve the high-temperature resistance and mechanical properties of the power tube; by comparing Comparative Example 2 with Examples 1-5, it can be seen that adding the modified anti-aging agent can improve the anti-aging performance of the power tube.

[0099] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

[0100] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only the specific implementation manners. Obviously, according to the content of this specification, many modifications and variations can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A high-temperature resistant power pipe, characterized in that, It consists of the following components in parts by weight: 60 - 80 parts of high-temperature resistant substrate, 10 - 30 parts of carbon fiber, and 1 - 5 parts of modified anti-aging agent. Among them, the high-temperature resistant substrate is prepared from 2,3,4-trifluorobenzaldehyde, malonic acid, mefenamic acid, trifluoroacetic anhydride, and 2,2-bis[4-(4-aminophenoxy)phenyl]propane; the modified anti-aging agent is prepared from absolute ethanol, paeonol, sodium hydroxide, and 2-methoxybenzaldehyde; The preparation method of the high-temperature resistant substrate includes the following steps: Q1: Add 2,3,4-trifluorobenzaldehyde, malonic acid, piperidine, and pyridine into a container in sequence, heat for reaction. After the reaction ends, add ice-water mixture, cool, filter by suction, wash, distill under reduced pressure, recrystallize, and dry to obtain Compound 1; Add mefenamic acid into a container containing glacial acetic acid. Under an ice bath environment, add hydrobromic acid, heat under reflux for reaction. After the reaction ends, add ice-water mixture, filter by suction and dry to obtain Compound 2; Q2: Add Compound 2 into tetrahydrofuran, ultrasonically oscillate, cool and stir in an ice bath, then add trifluoroacetic anhydride, react in an ice bath. After the reaction ends, add tert-butanol, slowly warm up to room temperature for reaction. After the reaction ends, cool and stir, add ammonia water, warm up to quench the reaction, distill under reduced pressure, extract, collect the organic phase, wash, dry, evaporate to dryness under reduced pressure, recrystallize to obtain Compound 3; Q3: Add Compound 1, Compound 3, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, and 4-dimethylaminopyridine into a container containing dichloromethane in sequence, react at room temperature. After the reaction ends, wash, dry, distill under reduced pressure, recrystallize to obtain Compound 4; Add Compound 4 into dichloromethane, stir in an ice bath, then add trifluoroacetic acid, warm up to room temperature for reaction. After the reaction ends, add dichloromethane, wash the organic phase, dry, distill under reduced pressure, recrystallize to obtain Compound 5; Q4: Add Compound 5 and 2,2-bis[4-(4-aminophenoxy)phenyl]propane into a container containing N-methylpyrrolidone, stir, then add lithium chloride, triphenyl phosphite, and pyridine, introduce nitrogen, heat for reaction. After the reaction ends, pour it into methanol, soak, crush, boil, wash, and dry under vacuum to obtain the high-temperature resistant substrate; The preparation method of the modified anti-aging agent includes the following steps: S1: Preheat a container with absolute ethanol, slowly add paeonol dissolved in absolute ethanol into the container, then add sodium hydroxide, stir to mix evenly; S2: Dissolve 2-methoxybenzaldehyde in absolute ethanol, slowly add it into the container, stir, add absolute ethanol after supplementation, heat and stir, heat under reflux for reaction. After the reaction ends, adjust the pH, add distilled water, cool in an ice bath, filter by suction, and dry to obtain the modified anti-aging agent.

2. The high-temperature resistant power tube according to claim 1, wherein In Q1, the molar ratio of 2,3,4-trifluorobenzaldehyde, malonic acid, piperidine and pyridine is (1 - 1.2):(2 - 2.4):(0.5 - 0.8):(10 - 12), the heating reaction temperature is 90 - 110 °C, and the reaction time is 1 - 3 h; the dosage ratio of mefenamic acid, glacial acetic acid and hydrobromic acid is (10 - 15) g:(50 - 75) mL:(25 - 35) mL, the volume fraction of hydrobromic acid is 48 vt%, the heating reflux reaction temperature is 110 - 130 °C, and the reaction time is 3 - 5 h.

3. A high-temperature resistant power tube according to claim 1, characterized in that, In Q2, the dosage ratio of compound 2, tetrahydrofuran, trifluoroacetic anhydride, tert-butanol and ammonia water is (8 - 10) g:(180 - 220) mL:(25 - 30) mL:(50 - 60) mL:(15 - 18) mL, the cooling and stirring time is 15 - 30 min, the ice bath reaction time is 4 - 6 h, the room temperature reaction time is 10 - 12 h, the cooling and stirring time is 15 - 25 min, the volume fraction of ammonia water is 28 vt%, the quenching reaction is 30 - 45 min, it is washed with saturated sodium bicarbonate, dried with anhydrous sodium sulfate, and recrystallized with absolute ethanol.

4. A high-temperature resistant power tube according to claim 1, characterized in that, In Q3, the molar ratio of compound 1, compound 3, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 4-dimethylaminopyridine is (1 - 1.2):(1 - 1.2):(1.2 - 1.5):(0.2 - 0.25), the room temperature reaction time is 1 - 3 h; the dosage ratio of compound 4 and trifluoroacetic acid is (0.2 - 0.4) g:(1 - 3) mL, the ice bath stirring time is 5 - 10 min, and the room temperature reaction time is 30 - 45 min.

5. A high-temperature resistant power tube according to claim 1, characterized in that, In Q4, the dosage ratio of compound 5, 2,2-bis[4-(4-aminophenoxy)phenyl]propane, N-methylpyrrolidone, lithium chloride, triphenyl phosphite and pyridine is (2.01 - 2.45) g:(3.9 - 4.6) g:(30 - 45) mL:(4.8 - 5.2) g:(8 - 12) mL:(10 - 12) mL, the temperature rising reaction temperature is 100 - 120 °C, and the reaction time is 6 - 8 h.

6. A high-temperature resistant power tube according to claim 1, characterized in that, In S1, the preheating temperature is 40 - 45 °C, the preheating time is 10 - 12 min, the dosage ratio of paeonol and sodium hydroxide is (0.42 - 0.54) g:(0.23 - 0.34) g, and the stirring time is 10 - 15 min; in S2, the dosage ratio of 2-methoxybenzaldehyde, absolute ethanol and the additional absolute ethanol is (0.42 - 0.47) g:(5 - 7.5) mL:(10 - 15) mL, the heating and stirring temperature is 40 - 50 °C, the time is 10 - 12 h, the temperature rising reflux reaction temperature is 60 - 65 °C, the time is 3 - 5 h, and the pH is adjusted to 7 with 6 mol / L hydrochloric acid solution.

7. The production process of a high-temperature resistant power tube according to any one of claims 1-6, characterized in that, It includes the following steps: Step 1: Mix the high-temperature resistant substrate, carbon fiber and modified anti-aging agent evenly, heat and melt, extrude, cool, shape, and anneal to obtain a crude product; Step 2: Polish, inspect, and package the crude product to obtain a high-temperature resistant power tube.

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