High-temperature-resistant power tube and production process thereof

Abstract

The invention discloses a high-temperature-resistant power tube and a production process thereof, and belongs to the technical field of power tube preparation. The high-temperature-resistant electric power tube is prepared from, by weight, 60-80 parts of a high-temperature-resistant base material, 10-30 parts of carbon fibers and 1-5 parts of a modified anti-aging agent, the high-temperature-resistant base material is prepared from 2, 3, 4-trifluorobenzaldehyde, malonic acid, oxynaphthalene propionic acid, trifluoroacetic anhydride and 2, 2-bis [4-(4-aminophenoxy) phenyl] propane, and the modified anti-aging agent is prepared from 2, 3, 4-trifluorobenzaldehyde, malonic acid, oxynaphthalene propionic acid, trifluoroacetic anhydride and 2, 2-bis [4-(4-aminophenoxy) phenyl] propane. The modified anti-aging agent is prepared from absolute ethyl alcohol, paeonol, sodium hydroxide and 2-methoxybenzaldehyde. The power tube prepared by the method has excellent high temperature resistance, mechanical property and aging resistance.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric power pipe preparation, and in particular relates to a high temperature resistant electric power pipe and a production process thereof. Background Art

[0002] With the rapid development of modern industry, the requirements for material performance in power transmission systems are increasing, especially in extreme environments such as high temperature, high pressure, and strong corrosion. Traditional power pipe materials can no longer meet the requirements. As a key basic material, high temperature resistant power pipes are widely used in power, petrochemical, aerospace, automobile manufacturing and other fields. Their performance is directly related to the safety and stability of the power system.

[0003] Traditional power pipe materials, such as polyvinyl chloride, polyethylene and polypropylene, have good electrical insulation and processing properties at room temperature, but their high temperature resistance is poor, and the long-term use 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 decrease in mechanical properties, which affects the safe operation of the power system. In addition, traditional materials also have poor chemical stability in highly corrosive environments, which limits their application in chemical, petroleum and other fields. Therefore, it is urgent to develop power pipe materials that can work stably in high temperature environments and have excellent comprehensive performance.

[0004] Patent CN104086919B discloses a high temperature resistant electric power protection tube, the raw materials of which include by weight: 100-150 parts of polyvinyl chloride, 50-100 parts of chlorinated polyvinyl chloride, 5-15 parts of glass beads, 10-25 parts of acrylic rubber, 2-6 parts of lanthanum ricinoleate, 1-5 parts of lanthanum protocatechuate, 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 electric power protection tube prepared by the invention has excellent high temperature resistance, good corrosion resistance, aging resistance, flame retardancy, high mechanical strength and toughness, but the high temperature resistance, aging resistance and mechanical properties of the electric power protection tube prepared by this method still have room for improvement. Summary of the invention

[0005] The purpose of the present invention is to provide a high-temperature resistant electric power pipe and a production process thereof, so as to solve the technical problems of high-temperature resistance, aging resistance and poor mechanical properties of the electric power pipe in the prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The invention provides a high-temperature resistant electric power pipe, which is composed of the following components in parts by weight: 60-80 parts of a high-temperature resistant base material, 10-30 parts of carbon fibers and 1-5 parts of a modified anti-aging agent, wherein 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 anhydrous ethanol, paeonol, sodium hydroxide and 2-methoxybenzaldehyde.

[0007] Preferably, the method for preparing the high temperature resistant substrate comprises the following steps: Q1: 2,3,4-trifluorobenzaldehyde, malonic acid, piperidine and pyridine were added to a container in sequence, heated for reaction, and after the reaction, an ice-water mixture was added, cooled, filtered, washed, distilled under reduced pressure, recrystallized, and dried to obtain compound 1; naphthoxypropionic acid was added to a container containing glacial acetic acid, and hydrobromic acid was added in an ice bath environment, and heated under reflux for reaction. After the reaction, an ice-water mixture was added, filtered, and dried to obtain compound 2; Q2: Compound 2 was added to tetrahydrofuran, subjected to ultrasonic oscillation, cooled in an ice bath and stirred, and then trifluoroacetic anhydride was added, and the mixture was reacted in an ice bath. After the reaction was completed, tert-butyl alcohol was added, and the mixture was slowly heated to room temperature for reaction. After the reaction was completed, the mixture was cooled and stirred, and aqueous ammonia was added. The mixture was heated to quench the reaction, and the mixture was distilled under reduced pressure, extracted, and the organic phase was collected, washed, dried, evaporated to dryness under reduced pressure, and recrystallized to obtain compound 3; Q3: Compound 1, compound 3, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 4-dimethylaminopyridine were added to a container filled with dichloromethane in sequence, and reacted at room temperature. After the reaction was completed, the mixture was washed, dried, distilled under reduced pressure, and recrystallized to obtain compound 4; compound 4 was added to dichloromethane, stirred in an ice bath, and then trifluoroacetic acid was added. The mixture was heated to room temperature for reaction. After the reaction was completed, dichloromethane was added, and the organic phase was washed, dried, distilled under reduced pressure, and recrystallized to obtain compound 5; Q4: Add compound 5 and 2,2-bis[4-(4-aminophenoxy)phenyl]propane to a container filled with N-methylpyrrolidone, stir, then add lithium chloride, triphenyl phosphite and pyridine, pass nitrogen, heat to react, after the reaction is completed, pour into methanol, soak, crush, boil, wash, and vacuum dry to obtain a high temperature resistant substrate.

[0008] 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 naphthoxypropionic acid is replaced by hydrobromic acid with a hydroxyl group to obtain compound 2. Subsequently, compound 2, trifluoroacetic anhydride and tert-butanol react to obtain compound 3. Compound 3 and compound 1 are then esterified to obtain compound 4. The tert-butyl ester group of compound 4 is hydrolyzed by trifluoroacetic acid to obtain compound 5. Compound 5 is polymerized 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:

[0009] The results of mass spectrometry analysis of compound 1 were: m / z: 202.02 (100.0%), 203.03 (9.9%); the results of mass spectrometry analysis of compound 2 were: m / z: 216.08 (100.0%), 217.08 (14.3%); the results of mass spectrometry analysis of compound 3 were: m / z: 272.14 (100.0%), 273.14 (18.4%), 274.15 (2.3%); the results of mass spectrometry analysis of compound 4 were: m / z: 456.15 (100.0%), 457.16 (28.5%), 458.16 (4.7%); the results of mass spectrometry analysis of compound 5 were: m / z: 400.09 (100.0%), 401.10 (24.1%), 402.10 (3.6%).

[0010] 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 1-3h; the dosage ratio of naphthyric acid, glacial acetic acid and hydrobromic acid is (10-15) g: (50-75) mL: (25-35) mL, the volume fraction of hydrobromic acid is 48vt%, the heating reflux reaction temperature is 110-130°C, and the reaction time is 3-5h.

[0011] Preferably, in Q2, the dosage ratio of compound 2, tetrahydrofuran, trifluoroacetic anhydride, tert-butanol and aqueous ammonia 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 aqueous ammonia is 28 vt%, the reaction is quenched for 30-45 min, washed with saturated sodium bicarbonate, dried with anhydrous sodium sulfate, and recrystallized with anhydrous ethanol.

[0012] 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), and the reaction time at room temperature is 1-3h; the amount ratio of compound 4 and trifluoroacetic acid is (0.2-0.4)g:(1-3)mL, the ice bath stirring time is 5-10min, and the reaction time at room temperature is 30-45min.

[0013] 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 heating reaction temperature is 100-120°C, and the reaction time is 6-8h.

[0014] Preferably, the preparation method of the modified anti-aging agent comprises the following steps: S1: adding anhydrous ethanol to a container for preheating, slowly adding paeonol dissolved in anhydrous ethanol to the container, and then adding sodium hydroxide, stirring, and mixing evenly; S2: Dissolve 2-methoxybenzaldehyde in anhydrous ethanol, slowly add it to the container, stir, add more anhydrous ethanol, heat and stir, raise the temperature to reflux for reaction, after the reaction is completed, adjust the pH, add distilled water, ice bath, filter, dry, and obtain a modified anti-aging agent.

[0015] In the above process, paeonol is used as a raw material, and a condensation reaction is carried out with 2-methoxybenzaldehyde under alkaline conditions to prepare a modified anti-aging agent, wherein the synthetic reaction formula of the modified anti-aging agent is as follows:

[0016] The results of mass spectrometry analysis of the modified anti-aging agent were: m / z: 284.10 (100.0%), 285.11 (18.7%), 286.11 (2.5%).

[0017] Preferably, 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, anhydrous ethanol and added anhydrous 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 heating 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.

[0018] Preferably, the production process of the high temperature resistant electric power pipe comprises the following steps: Step 1: Evenly mix the high temperature resistant substrate, carbon fiber and modified anti-aging agent, heat and melt, extrude, cool, shape and anneal to obtain a crude product; Step 2: Polish, test and package the rough product to obtain high temperature resistant power pipe.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: The invention firstly uses 2,3,4-trifluorobenzaldehyde, malonic acid, naphthoxypropionic acid, trifluoroacetic anhydride and 2,2-bis[4-(4-aminophenoxy)phenyl]propane as raw materials to prepare a high temperature resistant substrate, then uses anhydrous ethanol, paeonol, sodium hydroxide and 2-methoxybenzaldehyde as raw materials to prepare a modified anti-aging agent, and uses the high temperature resistant substrate, carbon fiber and the modified anti-aging agent as raw materials to prepare an electric power pipe with high temperature resistance, mechanical properties and anti-aging properties. The amide bonds contained in the high temperature resistant substrate have high bond energy, which can resist thermal decomposition reactions at high temperatures, making it difficult to break in high temperature environments and maintaining thermal stability. The introduced fluorine atoms have large electronegativity, which can destroy the conjugation of the electron cloud of the chromogenic functional structural group in the high temperature resistant substrate, thereby reducing the interaction force between the molecular chains, making it easier for the molecular chains to maintain their structural stability at high temperatures. The presence of fluorine atoms can also increase the distance between the molecular chains, further reducing the intermolecular forces, thereby improving the high temperature resistance. The hydrogen bonds contained in the high temperature resistant substrate can form a tight network structure between the molecular chains, increase the strength and toughness of the material, and improve the material The mechanical strength of the material, the electronegativity of the fluorine atom reduces the electron cloud density on the surface of the molecular chain, reduces the interaction force between the molecular chain and the friction surface, improves the wear resistance of the power tube, and increases its mechanical properties; the hydrogen atoms in the phenolic hydroxyl group in the modified anti-aging agent can combine with free radicals to form stable phenoloxy free radicals, thereby terminating the free radical chain reaction and protecting the power tube from oxidative damage, and the π electron cloud in the conjugated system contained can absorb the energy of ultraviolet rays and cause electronic transitions. After absorbing ultraviolet rays, the structure within the conjugated system will change, converting harmful ultraviolet light energy into harmless heat energy or releasing it as non-destructive longer light waves, thereby extending the service life. DETAILED DESCRIPTION

[0020] The following will be described clearly and completely in conjunction with 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.

[0021] Embodiment 1: This embodiment discloses a method for preparing a high temperature resistant substrate, comprising the following steps: Q1: 0.88g 2,3,4-trifluorobenzaldehyde, 1.144g malonic acid, 0.27g piperidine and 4.35g pyridine were added to a container in sequence, heated at 90°C for 1.5h, and after the reaction, an ice-water mixture was added, cooled, filtered, washed, distilled under reduced pressure, recrystallized, and dried to obtain compound 1; 12.5g naphthyl propionic acid was added to a container containing 62.5mL glacial acetic acid, and 30mL of hydrobromic acid with a volume fraction of 48vt% was added in an ice bath environment, and the mixture was heated at 120°C for reflux reaction for 4h. After the reaction, an ice-water mixture was added, filtered, and dried to obtain compound 2; Q2: Add 9g of compound 2 to 200mL of tetrahydrofuran, perform ultrasonic oscillation, cool in an ice bath and stir for 30min, then add 27.5mL of trifluoroacetic anhydride, react in an ice bath for 6h, add 55mL of tert-butanol after the reaction, slowly warm to room temperature and react for 12h, cool and stir for 15min, add 16.5mL of 28vt% ammonia water, heat to quench the reaction for 45min, perform vacuum distillation, extract, collect the organic phase, wash with saturated sodium bicarbonate, dry with anhydrous sodium sulfate, evaporate to dryness under reduced pressure, and recrystallize with anhydrous ethanol to obtain compound 3; 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 added to a container filled with dichloromethane in sequence, and reacted at room temperature for 2 h. After the reaction, the mixture 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, and then 2 mL of trifluoroacetic acid was added. The mixture was heated to room temperature and reacted for 45 min. After the reaction, dichloromethane was added, and the organic phase was washed, dried, distilled under reduced pressure, and recrystallized to obtain compound 5; Q4: Add 2.23g of compound 5 and 4.2g of 2,2-bis[4-(4-aminophenoxy)phenyl]propane into a container containing 37.5mL of N-methylpyrrolidone, stir, then add 5g of lithium chloride, 10mL of triphenyl phosphite and 11mL of pyridine, pass nitrogen, heat at 110℃ to react for 8h, after the reaction is completed, pour into methanol, soak, crush, boil, wash, and vacuum dry to obtain a high temperature resistant substrate.

[0022] This embodiment discloses a method for preparing a modified anti-aging agent, comprising the following steps: S1: Add 15 mL of anhydrous ethanol to the container, preheat at 45°C for 12 min, slowly add 0.48 g of paeonol dissolved in 5 mL of anhydrous ethanol to the container, then add 0.28 g of sodium hydroxide, stir for 15 min, and mix well; S2: Dissolve 0.45g of 2-methoxybenzaldehyde in 6.25mL of anhydrous ethanol, slowly add it to the container, stir, add 12.5mL of anhydrous ethanol, heat and stir at 45℃ for 12h, reflux at 65℃ for 5h, after the reaction, adjust the pH to 7 with 6mol / L hydrochloric acid solution, add distilled water, ice bath, filter, and dry to obtain a modified anti-aging agent.

[0023] The present embodiment discloses a high temperature resistant electric power pipe, which is composed of the following components in parts by weight: 70 parts of a high temperature resistant base material, 20 parts of carbon fiber and 3 parts of a modified anti-aging agent.

[0024] This embodiment discloses a production process of a high temperature resistant electric power pipe, comprising the following steps: Step 1: Evenly mix the high temperature resistant substrate, carbon fiber and modified anti-aging agent, heat and melt, extrude, cool, shape and anneal to obtain a crude product; Step 2: Polish, test and package the rough product to obtain high temperature resistant power pipe.

[0025] Embodiment 2: This embodiment discloses a method for preparing a high temperature resistant substrate, comprising the following steps: Q1: 0.8 g 2,3,4-trifluorobenzaldehyde, 1.04 g malonic acid, 0.21 g piperidine and 3.95 g pyridine were added to a container in sequence, heated at 90°C for 1.5 h, and after the reaction, an ice-water mixture was added, cooled, filtered, washed, distilled under reduced pressure, recrystallized, and dried to obtain compound 1; 10 g naphthyl propionic acid was added to a container containing 50 mL glacial acetic acid, and 25 mL of hydrobromic acid with a volume fraction of 48 vt% was added in an ice bath environment, and the mixture was heated at 120°C for reflux reaction for 4 h. After the reaction, an ice-water mixture was added, filtered, and dried to obtain compound 2; Q2: 8 g of compound 2 was added to 180 mL of tetrahydrofuran, and ultrasonically oscillated. After cooling and stirring in an ice bath for 30 min, 25 mL of trifluoroacetic anhydride was added and the mixture was reacted in an ice bath for 6 h. After the reaction was completed, 50 mL of tert-butyl alcohol was added and the mixture was slowly heated to room temperature and reacted for 12 h. After the reaction was completed, the mixture was cooled and stirred for 15 min, 15 mL of 28% by volume ammonia water was added, the mixture was heated to quench the reaction for 45 min, and the mixture was distilled under reduced pressure and extracted. The organic phase was collected and washed with saturated sodium bicarbonate, dried with anhydrous sodium sulfate, evaporated to dryness under reduced pressure, and recrystallized with anhydrous ethanol to obtain compound 3; Q3: 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 were added to a container filled with dichloromethane in sequence, and reacted at room temperature for 2 h. After the reaction, the mixture was washed, dried, distilled under reduced pressure, and recrystallized to obtain compound 4; 0.2 g of compound 4 was added to 5 mL of dichloromethane, stirred in an ice bath for 10 min, and then 1 mL of trifluoroacetic acid was added. The mixture was heated to room temperature and reacted for 45 min. After the reaction, dichloromethane was added, and the organic phase was washed, dried, distilled under reduced pressure, and recrystallized to obtain compound 5; Q4: Add 2.01g of compound 5 and 3.9g of 2,2-bis[4-(4-aminophenoxy)phenyl]propane into a container containing 30mL of N-methylpyrrolidone, stir, then add 4.8g of lithium chloride, 8mL of triphenyl phosphite and 10mL of pyridine, pass nitrogen, heat to 110℃ for 8h, after the reaction is completed, pour into methanol, soak, crush, boil, wash, and vacuum dry to obtain a high temperature resistant substrate.

[0026] This embodiment discloses a method for preparing a modified anti-aging agent, comprising the following steps: S1: Add 15 mL of anhydrous ethanol to the container, preheat at 45°C for 12 min, slowly add 0.42 g of paeonol dissolved in 5 mL of anhydrous ethanol to the container, then add 0.23 g of sodium hydroxide, stir for 15 min, and mix well; S2: Dissolve 0.42g of 2-methoxybenzaldehyde in 5mL of anhydrous ethanol, slowly add it to the container, stir, add 10mL of anhydrous ethanol, heat and stir at 45℃ for 12h, reflux at 65℃ for 5h, after the reaction, adjust the pH to 7 with 6mol / L hydrochloric acid solution, add distilled water, ice bath, filter, and dry to obtain a modified anti-aging agent.

[0027] The present embodiment discloses a high temperature resistant electric power pipe, which is composed of the following components in parts by weight: 60 parts of a high temperature resistant base material, 10 parts of carbon fiber and 1 part of a modified anti-aging agent.

[0028] This embodiment discloses a production process of a high temperature resistant electric power pipe, comprising the following steps: Step 1: Evenly mix the high temperature resistant substrate, carbon fiber and modified anti-aging agent, heat and melt, extrude, cool, shape and anneal to obtain a crude product; Step 2: Polish, test and package the rough product to obtain high temperature resistant power pipe.

[0029] Embodiment 3: This embodiment discloses a method for preparing a high temperature resistant substrate, comprising the following steps: Q1: 0.96g 2,3,4-trifluorobenzaldehyde, 1.248g malonic acid, 0.34g piperidine and 4.74g pyridine were added to a container in sequence, heated at 90°C for 1.5h, and after the reaction, an ice-water mixture was added, cooled, filtered, washed, distilled under reduced pressure, recrystallized, and dried to obtain compound 1; 15g naphthyl propionic acid was added to a container containing 75mL glacial acetic acid, and 35mL of hydrobromic acid with a volume fraction of 48vt% was added in an ice bath environment, and the mixture was heated at 120°C for reflux for 4h. After the reaction, an ice-water mixture was added, filtered, and dried to obtain compound 2; Q2: Add 10g of compound 2 to 220mL of tetrahydrofuran, ultrasonically oscillate, cool in an ice bath and stir for 30min, then add 30mL of trifluoroacetic anhydride, react in an ice bath for 6h, add 60mL of tert-butanol after the reaction, slowly warm to room temperature and react for 12h, cool and stir for 15min, add 18mL of 28vt% ammonia water, heat to quench the reaction for 45min, 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 anhydrous ethanol to obtain compound 3; Q3: 1.08g of compound 1, 1.63g of compound 3, 1.44g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 0.15g of 4-dimethylaminopyridine were added to a container filled with dichloromethane in sequence, and reacted at room temperature for 2h. After the reaction, the mixture was washed, dried, distilled under reduced pressure, and recrystallized to obtain compound 4; 0.4g of compound 4 was added to 5mL of dichloromethane, stirred in an ice bath for 10min, and then 3mL of trifluoroacetic acid was added. The mixture was heated to room temperature and reacted for 45min. After the reaction, dichloromethane was added, and the organic phase was washed, dried, distilled under reduced pressure, and recrystallized to obtain compound 5; Q4: Add 2.45g of compound 5 and 4.6g of 2,2-bis[4-(4-aminophenoxy)phenyl]propane into a container containing 45mL of N-methylpyrrolidone, stir, then add 5.2g of lithium chloride, 12mL of triphenyl phosphite and 12mL of pyridine, pass nitrogen, heat at 110℃ to react for 8h, after the reaction is completed, pour into methanol, soak, crush, boil, wash, and vacuum dry to obtain a high temperature resistant substrate.

[0030] This embodiment discloses a method for preparing a modified anti-aging agent, comprising the following steps: S1: Add 15 mL of anhydrous ethanol to the container, preheat at 45°C for 12 min, slowly add 0.54 g of paeonol dissolved in 5 mL of anhydrous ethanol to the container, then add 0.34 g of sodium hydroxide, stir for 15 min, and mix well; S2: Dissolve 0.47g of 2-methoxybenzaldehyde in 7.5mL of anhydrous ethanol, slowly add it to the container, stir, add 15mL of anhydrous ethanol, heat and stir at 45℃ for 12h, reflux at 65℃ for 5h, after the reaction, adjust the pH to 7 with 6mol / L hydrochloric acid solution, add distilled water, ice bath, filter, and dry to obtain a modified anti-aging agent.

[0031] The present embodiment discloses a high temperature resistant electric power pipe, which is composed of the following components in parts by weight: 80 parts of a high temperature resistant base material, 30 parts of carbon fiber and 5 parts of a modified anti-aging agent.

[0032] This embodiment discloses a production process of a high temperature resistant electric power pipe, comprising the following steps: Step 1: Evenly mix the high temperature resistant substrate, carbon fiber and modified anti-aging agent, heat and melt, extrude, cool, shape and anneal to obtain a crude product; Step 2: Polish, test and package the rough product to obtain high temperature resistant power pipe.

[0033] Embodiment 4: This embodiment discloses a method for preparing a high temperature resistant substrate, comprising the following steps: Q1: 0.82g 2,3,4-trifluorobenzaldehyde, 1.09g malonic acid, 0.24g piperidine and 4.17g pyridine were added to a container in sequence, heated at 90°C for 1.5h, and after the reaction, an ice-water mixture was added, cooled, filtered, washed, distilled under reduced pressure, recrystallized, and dried to obtain compound 1; 11g naphthyl propionic acid was added to a container containing 55mL glacial acetic acid, and 27mL of hydrobromic acid with a volume fraction of 48vt% was added in an ice bath environment, and the mixture was heated at 120°C for reflux for 4h. After the reaction, an ice-water mixture was added, filtered, and dried to obtain compound 2; Q2: 8.5 g of compound 2 was added to 190 mL of tetrahydrofuran, and ultrasonically oscillated. After ice-cooling and stirring for 30 min, 26 mL of trifluoroacetic anhydride was added and the mixture was reacted in an ice bath for 6 h. After the reaction was completed, 52 mL of tert-butyl alcohol was added and the mixture was slowly heated to room temperature and reacted for 12 h. After the reaction was completed, the mixture was cooled and stirred for 15 min, 16 mL of 28% by volume ammonia water was added, the mixture was heated to quench the reaction for 45 min, and the mixture was distilled under reduced pressure and extracted. The organic phase was collected and washed with saturated sodium bicarbonate, dried with anhydrous sodium sulfate, evaporated to dryness under reduced pressure, and recrystallized with anhydrous ethanol to obtain compound 3; Q3: 0.92g of compound 1, 1.41g of compound 3, 1.23g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 0.135g of 4-dimethylaminopyridine were added to a container filled with dichloromethane in sequence, and reacted at room temperature for 2h. After the reaction, the mixture was washed, dried, distilled under reduced pressure, and recrystallized to obtain compound 4; 0.25g of compound 4 was added to 5mL of dichloromethane, stirred in an ice bath for 10min, and then 1.5mL of trifluoroacetic acid was added. The mixture was heated to room temperature and reacted for 45min. After the reaction, dichloromethane was added, and the organic phase was washed, dried, distilled under reduced pressure, and recrystallized to obtain compound 5; Q4: Add 2.12g of compound 5 and 4.1g of 2,2-bis[4-(4-aminophenoxy)phenyl]propane into a container containing 32mL of N-methylpyrrolidone, stir, then add 4.9g of lithium chloride, 9mL of triphenyl phosphite and 10.5mL of pyridine, pass nitrogen, heat at 110℃ to react for 8h, after the reaction is completed, pour into methanol, soak, crush, boil, wash, and vacuum dry to obtain a high temperature resistant substrate.

[0034] This embodiment discloses a method for preparing a modified anti-aging agent, comprising the following steps: S1: Add 15 mL of anhydrous ethanol to the container, preheat at 45°C for 12 min, slowly add 0.46 g of paeonol dissolved in 5 mL of anhydrous ethanol to the container, then add 0.26 g of sodium hydroxide, stir for 15 min, and mix well; S2: Dissolve 0.43g of 2-methoxybenzaldehyde in 5.5mL of anhydrous ethanol, slowly add it to the container, stir, add 11mL of anhydrous ethanol, heat and stir at 45℃ for 12h, reflux at 65℃ for 5h, after the reaction, adjust the pH to 7 with 6mol / L hydrochloric acid solution, add distilled water, ice bath, filter, and dry to obtain a modified anti-aging agent.

[0035] The present embodiment discloses a high temperature resistant electric power pipe, which is composed of the following components in parts by weight: 65 parts of a high temperature resistant base material, 15 parts of carbon fiber and 1.5 parts of a modified anti-aging agent.

[0036] This embodiment discloses a production process of a high temperature resistant electric power pipe, comprising the following steps: Step 1: Evenly mix the high temperature resistant substrate, carbon fiber and modified anti-aging agent, heat and melt, extrude, cool, shape and anneal to obtain a crude product; Step 2: Polish, test and package the rough product to obtain high temperature resistant power pipe.

[0037] Embodiment 5: This embodiment discloses a method for preparing a high temperature resistant substrate, comprising the following steps: Q1: 0.94 g 2,3,4-trifluorobenzaldehyde, 1.213 g malonic acid, 0.31 g piperidine and 4.52 g pyridine were added to a container in sequence, heated at 90°C for 1.5 h, and after the reaction, an ice-water mixture was added, cooled, filtered, washed, distilled under reduced pressure, recrystallized, and dried to obtain compound 1; 14 g naphthyl propionic acid was added to a container containing 70 mL glacial acetic acid, and 32 mL of hydrobromic acid with a volume fraction of 48 vt% was added in an ice bath environment, and the mixture was heated at 120°C for reflux for 4 h. After the reaction, an ice-water mixture was added, filtered, and dried to obtain compound 2; Q2: 9.5 g of compound 2 was added to 210 mL of tetrahydrofuran, and ultrasonically oscillated. After cooling and stirring in an ice bath for 30 min, 29 mL of trifluoroacetic anhydride was added and the mixture was reacted in an ice bath for 6 h. After the reaction was completed, 58 mL of tert-butanol was added and the mixture was slowly heated to room temperature and reacted for 12 h. After the reaction was completed, the mixture was cooled and stirred for 15 min, 17 mL of 28% ammonia water was added, the mixture was heated to quench the reaction for 45 min, and the mixture was distilled under reduced pressure and extracted. The organic phase was collected and washed with saturated sodium bicarbonate, dried with anhydrous sodium sulfate, evaporated to dryness under reduced pressure, and recrystallized with anhydrous ethanol to obtain compound 3; Q3: 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 were added to a container filled with dichloromethane in sequence, and reacted at room temperature for 2 h. After the reaction, the mixture was washed, dried, distilled under reduced pressure, and recrystallized to obtain compound 4; 0.35 g of compound 4 was added to 5 mL of dichloromethane, stirred in an ice bath for 10 min, and then 2.5 mL of trifluoroacetic acid was added. The mixture was heated to room temperature and reacted for 45 min. After the reaction, dichloromethane was added, and the organic phase was washed, dried, distilled under reduced pressure, and recrystallized to obtain compound 5; Q4: Add 2.34g of compound 5 and 4.4g of 2,2-bis[4-(4-aminophenoxy)phenyl]propane into a container containing 42mL of N-methylpyrrolidone, stir, then add 5.1g of lithium chloride, 11mL of triphenyl phosphite and 11.5mL of pyridine, pass nitrogen, heat at 110℃ to react for 8h, after the reaction is completed, pour into methanol, soak, crush, boil, wash, and vacuum dry to obtain a high temperature resistant substrate.

[0038] This embodiment discloses a method for preparing a modified anti-aging agent, comprising the following steps: S1: Add 15 mL of anhydrous ethanol to the container, preheat at 45°C for 12 min, slowly add 0.52 g of paeonol dissolved in 5 mL of anhydrous ethanol to the container, then add 0.31 g of sodium hydroxide, stir for 15 min, and mix well; S2: Dissolve 0.46g of 2-methoxybenzaldehyde in 6.5mL of anhydrous ethanol, slowly add it to the container, stir, add 14mL of anhydrous ethanol, heat and stir at 45℃ for 12h, reflux at 65℃ for 5h, after the reaction, adjust the pH to 7 with 6mol / L hydrochloric acid solution, add distilled water, ice bath, filter, and dry to obtain a modified anti-aging agent.

[0039] The present embodiment discloses a high temperature resistant electric power pipe, which is composed of the following components in parts by weight: 75 parts of a high temperature resistant base material, 25 parts of carbon fiber and 4 parts of a modified anti-aging agent.

[0040] This embodiment discloses a production process of a high temperature resistant electric power pipe, comprising the following steps: Step 1: Evenly mix the high temperature resistant substrate, carbon fiber and modified anti-aging agent, heat and melt, extrude, cool, shape and anneal to obtain a crude product; Step 2: Polish, test and package the rough product to obtain high temperature resistant power pipe.

[0041] Comparative Example 1: Compared with Example 1, in the process of preparing the high-temperature resistant power pipe, the high-temperature resistant substrate is replaced by polyvinyl chloride, and other conditions remain unchanged.

[0042] Comparative Example 2: Compared with Example 1, in the process of preparing the high-temperature resistant power pipe, no modified anti-aging agent is added in Comparative Example 2, and other conditions remain unchanged.

[0043] Experimental Example: The power pipes prepared in Examples 1-5 and Comparative Examples 1-2 were subjected to performance tests. 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 aging resistance of the samples was tested according to GB / T 14522-2008. The test results are shown in Table 1: Table 1

[0044] From the test results in Table 1, it can be seen that the electric power pipes prepared in Examples 1-5 of the present invention have excellent high temperature resistance, mechanical properties and aging resistance. From the comparison between Comparative Example 1 and Examples 1-5, it can be seen that the use of high temperature resistant substrates can effectively improve the high temperature resistance and mechanical properties of the electric power pipes; from the comparison between Comparative Example 2 and Examples 1-5, it can be seen that the addition of modified anti-aging agents can improve the aging resistance of the electric power pipes.

[0045] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0046] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. 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 understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high temperature resistant electric power pipe, characterized in that: The invention is composed of the following components in parts by weight: 60-80 parts of a high temperature resistant substrate, 10-30 parts of carbon fibers and 1-5 parts of a modified anti-aging agent, wherein the high temperature resistant substrate 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 anhydrous ethanol, paeonol, sodium hydroxide and 2-methoxybenzaldehyde.

2. A high temperature resistant electric power pipe according to claim 1, characterized in that: The method for preparing the high temperature resistant substrate comprises the following steps: Q1: 2,3,4-trifluorobenzaldehyde, malonic acid, piperidine and pyridine were added to a container in sequence, heated for reaction, and after the reaction, an ice-water mixture was added, cooled, filtered, washed, distilled under reduced pressure, recrystallized, and dried to obtain compound 1; naphthoxypropionic acid was added to a container containing glacial acetic acid, and hydrobromic acid was added in an ice bath environment, and heated under reflux for reaction. After the reaction, an ice-water mixture was added, filtered, and dried to obtain compound 2; Q2: Compound 2 was added to tetrahydrofuran, subjected to ultrasonic oscillation, cooled in an ice bath and stirred, and then trifluoroacetic anhydride was added, and the mixture was reacted in an ice bath. After the reaction was completed, tert-butyl alcohol was added, and the mixture was slowly heated to room temperature for reaction. After the reaction was completed, the mixture was cooled and stirred, and aqueous ammonia was added. The mixture was heated to quench the reaction, and the mixture was distilled under reduced pressure, extracted, and the organic phase was collected, washed, dried, evaporated to dryness under reduced pressure, and recrystallized to obtain compound 3; Q3: Compound 1, compound 3, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 4-dimethylaminopyridine were added to a container filled with dichloromethane in sequence, and reacted at room temperature. After the reaction was completed, the mixture was washed, dried, distilled under reduced pressure, and recrystallized to obtain compound 4; compound 4 was added to dichloromethane, stirred in an ice bath, and then trifluoroacetic acid was added. The mixture was heated to room temperature for reaction. After the reaction was completed, dichloromethane was added, and the organic phase was washed, dried, distilled under reduced pressure, and recrystallized to obtain compound 5; Q4: Add compound 5 and 2,2-bis[4-(4-aminophenoxy)phenyl]propane to a container filled with N-methylpyrrolidone, stir, then add lithium chloride, triphenyl phosphite and pyridine, pass nitrogen, heat to react, after the reaction is completed, pour into methanol, soak, crush, boil, wash, and vacuum dry to obtain a high temperature resistant substrate.

3. A high temperature resistant electric power pipe according to claim 2, characterized in that: 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 1-3h; the dosage ratio of naphthyric acid, glacial acetic acid and hydrobromic acid is (10-15) g: (50-75) mL: (25-35) mL, the volume fraction of hydrobromic acid is 48vt%, the heating reflux reaction temperature is 110-130°C, and the reaction time is 3-5h.

4. A high temperature resistant electric power pipe according to claim 2, characterized in that: In Q2, the dosage ratio of compound 2, tetrahydrofuran, trifluoroacetic anhydride, tert-butanol and aqueous ammonia 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 aqueous ammonia is 28 vt%, the reaction is quenched for 30-45 min, washed with saturated sodium bicarbonate, dried with anhydrous sodium sulfate, and recrystallized with anhydrous ethanol.

5. The high temperature resistant electric power pipe according to claim 2, 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), and the reaction time at room temperature is 1-3h; the amount ratio of compound 4 and trifluoroacetic acid is (0.2-0.4)g:(1-3)mL, the ice bath stirring time is 5-10min, and the reaction time at room temperature is 30-45min.

6. The high temperature resistant electric power pipe according to claim 2, 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 heating reaction temperature is 100-120°C, and the reaction time is 6-8h.

7. The high temperature resistant electric power pipe according to claim 1, characterized in that: The preparation method of the modified anti-aging agent comprises the following steps: S1: adding anhydrous ethanol to a container for preheating, slowly adding paeonol dissolved in anhydrous ethanol to the container, and then adding sodium hydroxide, stirring, and mixing evenly; S2: Dissolve 2-methoxybenzaldehyde in anhydrous ethanol, slowly add it to the container, stir, add more anhydrous ethanol, heat and stir, raise the temperature to reflux for reaction, after the reaction is completed, adjust the pH, add distilled water, ice bath, filter, dry, and obtain a modified anti-aging agent.

8. The high temperature resistant electric power pipe according to claim 7, characterized in that: In the 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 the S2, the dosage ratio of 2-methoxybenzaldehyde, anhydrous ethanol and added anhydrous 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 heating reflux reaction temperature is 60-65°C, the time is 3-5 h, and the pH is adjusted to 7 with a 6 mol / L hydrochloric acid solution.

9. A production process for a high temperature resistant electric power pipe according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Evenly mix the high temperature resistant substrate, carbon fiber and modified anti-aging agent, heat and melt, extrude, cool, shape and anneal to obtain a crude product; Step 2: Polish, test and package the rough product to obtain high temperature resistant power pipe.

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