Thermo-oxidative aging resistant polyester material and preparation method thereof

Abstract

The present invention provides a thermo-oxidative aging resistant polyester material and a preparation method thereof, and relates to the technical field of polyester materials, the thermo-oxidative aging resistant polyester material is prepared from the following raw materials by weight: 100 parts of a functional polycondensate, 0.5-1 part of phosphorus pentoxide, 0.3-0.5 part of polyphosphoric acid, 0.8-1.5 parts of an antioxidant, 0.5-0.8 part of a lubricant, 1-3 parts of a coupling agent, 20-30 parts of reinforcing fibers, 1-3 parts of 1, 3, 4-trimethyl-1, 3-pentanediol monoisobutyrate, and 1-3 parts of an antioxidant. 1 to 3 parts of 1, 3, 5-triglycidyl-S-triazinetrione, and 3 to 5 parts of 1-amino-8-naphthol-3, 6-disulfonic acid; the functional polycondensate is prepared from 5-hydroxyisophthalic acid, 2, 3, 5, 6-tetrafluoroterephthalyl alcohol and N, N '-bis (2-hydroxyethyl) piperazine through a condensation polymerization reaction. The material has the advantages of favorable thermo-oxidative aging resistance, favorable mechanical properties, favorable flame retardancy and long service life.

Description

Technical Field

[0001] The invention relates to the technical field of polyester materials, and in particular to a heat-oxidative aging-resistant polyester material and a preparation method thereof. Background Art

[0002] Polyester materials, including polyethylene terephthalate (PET), polybutylene terephthalate (PBT), etc., as thermoplastic resins, are a type of engineering plastics with excellent performance and wide applications. Due to its excellent mechanical properties, electrical insulation properties and heat resistance, it is widely used in the fields of electronic appliances, automobile industry and machinery, polyester fiber and plastic packaging. However, due to the limitations of its own structure, polyester materials are easily attacked by heat and oxygen, resulting in performance deterioration, such as yellowing, surface cracking and powdering, and a significant decrease in mechanical properties. For this reason, many products have put forward long-term heat and oxygen aging resistance requirements for polyester materials.

[0003] At present, the commonly used methods to improve the aging performance of polyester material systems include adding high-efficiency antioxidants, compounding multiple antioxidants, loading antioxidants, adding high molecular weight hindered amines, etc., but the heat aging resistance is limited. Moreover, the addition of a large amount of these additives will greatly reduce the mechanical properties of the resin. During long-term use, these additives will also leak out, affecting the long-term performance stability and shortening the service life.

[0004] In order to solve the above problems, the Chinese invention patent with the authorization announcement number CN108641321B discloses a method for preparing a heat-oxidative aging-resistant unsaturated polyester resin material for artificial stone. The method proposes adding an antioxidant to the unsaturated polyester resin to improve the yellowing resistance of the resin, and adding a light stabilizer to improve the mechanical properties of the resin. The method can effectively avoid the defect of a sharp drop in mechanical properties caused by the addition of antioxidants, so that the prepared unsaturated polyester resin material for artificial stone has excellent heat-oxidative aging resistance and can also meet the mechanical property requirements of artificial stone preparation. However, its flame retardancy is not good, its mechanical properties still need to be further improved, and its service life still needs to be further extended. Summary of the invention

[0005] In view of the above problems, the object of the present invention is to provide a polyester material resistant to heat and oxygen aging, which has good resistance to heat and oxygen aging, excellent mechanical properties and flame retardancy, and long service life, and a preparation method thereof.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a heat-resistant and oxygen-aging-resistant polyester material, comprising the following raw materials in parts by weight: 100 parts of functional polycondensate, 0.5-1 parts of phosphorus pentoxide, 0.3-0.5 parts of polyphosphoric acid, 0.8-1.5 parts of antioxidant, 0.5-0.8 parts of lubricant, 1-3 parts of coupling agent, 20-30 parts of reinforcing fiber, 1-3 parts of 1,3,5-triglycidyl-S-triazinetrione, and 3-5 parts of 1-amino-8-naphthol-3,6-disulfonic acid; the functional polycondensate is made by condensation reaction of 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, and N,N'-bis(2-hydroxyethyl)piperazine.

[0007] Preferably, the preparation method of the functional polycondensate comprises the following steps: adding 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, N,N'-bis(2-hydroxyethyl)piperazine and a catalyst to a high boiling point solvent, stirring at 105-125°C for 2-4 hours to obtain a reaction solution, then adding the reaction solution to a high-pressure reactor, closing the feed port after the addition is completed, replacing the air in the reactor with an inert gas, then stirring and reacting at 135-155°C under normal pressure for 3-5 hours, then reducing the pressure to 50-100 Pa, heating to 245-265°C, stirring and reacting at this temperature and pressure for 15-20 hours, cooling to room temperature after the reaction is completed, precipitating in water, washing the precipitated polymer with ethanol for 3-6 times, and finally drying in a vacuum dryer at 85-95°C to constant weight to obtain a functional polycondensate.

[0008] Preferably, the molar ratio of the 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, N,N'-bis(2-hydroxyethyl)piperazine, catalyst and high boiling point solvent is 1:0.8:0.2:(0.6-1):(6-10).

[0009] Preferably, the high boiling point solvent is at least one of dimethyl sulfoxide, N,N-dimethylformamide, and N-methylpyrrolidone; the catalyst is antimony glycol; the inert gas is any one of nitrogen, helium, neon, and argon; and the high boiling point solvent is dimethyl sulfoxide.

[0010] Preferably, the antioxidant is at least one of antioxidant 1010 and antioxidant 168; the lubricant is at least one of paraffin and polydimethylsiloxane; and the coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560 and silane coupling agent KH570.

[0011] Preferably, the reinforcing fiber is alkali-free chopped glass fiber, with an average diameter of 3-9 μm and an aspect ratio of (20-30):1.

[0012] Another object of the present invention is to provide a method for preparing the heat-resistant and oxygen-aging polyester material, comprising the following steps: mixing the raw materials uniformly by weight to obtain a mixture, and then adding the mixture to a twin-screw extruder for extrusion molding to obtain the heat-resistant and oxygen-aging polyester material.

[0013] Preferably, the extrusion temperature of the twin-screw extruder is 240-260° C., and the screw speed is 240-350 r / min.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The preparation method of the heat-resistant and oxygen-aging-resistant polyester material disclosed in the present invention has simple process, convenient operation and control, high preparation efficiency and finished product qualification rate, low dependence on equipment, low energy consumption, and is suitable for continuous large-scale production.

[0016] (2) The heat-oxidative aging-resistant polyester material disclosed in the present invention is made of the following raw materials in parts by weight: 100 parts of functional polycondensate, 0.5-1 parts of phosphorus pentoxide, 0.3-0.5 parts of polyphosphoric acid, 0.8-1.5 parts of antioxidant, 0.5-0.8 parts of lubricant, 1-3 parts of coupling agent, 20-30 parts of reinforcing fiber, 1-3 parts of 1,3,5-triglycidyl-S-triazinetrione, and 3-5 parts of 1-amino-8-naphthol-3,6-disulfonic acid; the functional polycondensate is made of 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, and N,N'-bis(2-hydroxyethyl)piperazine through polycondensation reaction. Through the mutual coordination and joint action of the raw materials, the polyester material product has good heat-oxidative aging resistance, excellent mechanical properties and flame retardancy, and long service life.

[0017] (3) The heat-resistant and oxygen-aging-resistant polyester material disclosed in the present invention simultaneously introduces tetrafluorobenzene, triazinetrione, piperazine, ester and phenolic hydroxyl groups into the internal structure of the material through the interaction between the various raw materials. These structures, under the multiple effects of electronic effect, steric effect and conjugation effect, make the manufactured product have better heat-resistant and oxygen-aging-resistant performance, better mechanical properties and flame retardancy, and longer service life; at the same time, an interpenetrating network structure is formed, so that the above-mentioned properties are further improved. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the product of the present invention is further described in detail below in conjunction with embodiments.

[0019] Example 1

[0020] A heat-resistant and oxygen-aging polyester material comprises the following raw materials in parts by weight: 100 parts of a functional polycondensate, 0.5 parts of phosphorus pentoxide, 0.3 parts of polyphosphoric acid, 0.8 parts of an antioxidant, 0.5 parts of a lubricant, 1 part of a coupling agent, 20 parts of reinforcing fibers, 1 part of 1,3,5-triglycidyl-S-triazinetrione, and 3 parts of 1-amino-8-naphthol-3,6-disulfonic acid; the functional polycondensate is prepared by polycondensation of 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, and N,N'-bis(2-hydroxyethyl)piperazine.

[0021] The preparation method of the functional polycondensate comprises the following steps: adding 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, N,N'-bis(2-hydroxyethyl)piperazine and a catalyst into a high boiling point solvent, stirring at 105°C for 2 hours to obtain a reaction solution, then adding the reaction solution into a high pressure reactor, closing the feed port after the addition is completed, replacing the air in the reactor with an inert gas, then stirring and reacting at 135°C under normal pressure for 3 hours, then reducing the pressure to 50 Pa, heating to 245°C, and stirring and reacting for 1 hour while maintaining the temperature and pressure. 5 hours, after the reaction is completed, cool to room temperature, precipitate in water, wash the precipitated polymer 3 times with ethanol, and finally place it in a vacuum dryer and dry it at 85°C to constant weight to obtain a functional polycondensate; the molar ratio of 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, N,N'-bis(2-hydroxyethyl)piperazine, catalyst, and high boiling point solvent is 1:0.8:0.2:0.6:6; the high boiling point solvent is dimethyl sulfoxide; the catalyst is ethylene glycol antimony; the inert gas is nitrogen; the high boiling point solvent is dimethyl sulfoxide. Through GPC testing, the number average molecular weight of the functional polycondensate is 14370g / mol, M W / M n =1.338; through elemental analysis and weight change calculation, the molar ratio of the structural units introduced by 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol and N,N'-bis(2-hydroxyethyl)piperazine in the functional polycondensate is the same as the theoretical value.

[0022] The antioxidant is antioxidant 1010; the lubricant is paraffin; the coupling agent is silane coupling agent KH550; the reinforcing fiber is alkali-free chopped glass fiber, with an average diameter of 3 μm and an aspect ratio of 20:1.

[0023] A preparation method of the heat-resistant and oxygen-aging polyester material comprises the following steps: uniformly mixing the raw materials according to weight to obtain a mixture, and then adding the mixture into a twin-screw extruder for extrusion molding to obtain the heat-resistant and oxygen-aging polyester material; the extrusion temperature of the twin-screw extruder is 240°C and the screw speed is 240r / min.

[0024] Example 2

[0025] A heat-resistant oxidative aging polyester material comprises the following raw materials in parts by weight: 100 parts of functional polycondensate, 0.6 parts of phosphorus pentoxide, 0.35 parts of polyphosphoric acid, 1 part of antioxidant, 0.6 parts of lubricant, 1.5 parts of coupling agent, 23 parts of reinforcing fiber, 1.5 parts of 1,3,5-triglycidyl-S-triazinetrione, and 3.5 parts of 1-amino-8-naphthol-3,6-disulfonic acid; the functional polycondensate is prepared by polycondensation reaction of 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, and N,N'-bis(2-hydroxyethyl)piperazine.

[0026] The preparation method of the functional polycondensate comprises the following steps: adding 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, N,N'-bis(2-hydroxyethyl)piperazine and a catalyst into a high boiling point solvent, stirring at 110°C for 2.5 hours to obtain a reaction solution, then adding the reaction solution into a high pressure reactor, closing the feed port after the addition is completed, replacing the air in the reactor with an inert gas, then stirring and reacting at 140°C under normal pressure for 3.5 hours, then reducing the pressure to 60 Pa, heating to 250°C, and stirring and reacting at the same temperature and pressure for 16 hours. hours, and after the reaction is completed, it is cooled to room temperature, precipitated in water, and the precipitated polymer is washed with ethanol for 4 times, and finally placed in a vacuum dryer and dried at 87°C to constant weight to obtain a functional polycondensate; the molar ratio of the 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, N,N'-bis(2-hydroxyethyl)piperazine, catalyst, and high boiling point solvent is 1:0.8:0.2:0.7:7; the high boiling point solvent is N,N-dimethylformamide; the catalyst is ethylene glycol antimony; the inert gas is helium; and the high boiling point solvent is dimethyl sulfoxide.

[0027] The antioxidant is antioxidant 168; the lubricant is polydimethylsiloxane; the coupling agent is silane coupling agent KH560; the reinforcing fiber is alkali-free chopped glass fiber, with an average diameter of 5 μm and an aspect ratio of 23:1.

[0028] A preparation method of the heat-resistant and oxygen-aging polyester material comprises the following steps: uniformly mixing the raw materials according to weight to obtain a mixture, and then adding the mixture into a twin-screw extruder for extrusion molding to obtain the heat-resistant and oxygen-aging polyester material; the extrusion temperature of the twin-screw extruder is 245°C and the screw speed is 260r / min.

[0029] Example 3

[0030] A heat-resistant and oxygen-aging polyester material comprises the following raw materials in parts by weight: 100 parts of a functional polycondensate, 0.7 parts of phosphorus pentoxide, 0.4 parts of polyphosphoric acid, 1.2 parts of an antioxidant, 0.65 parts of a lubricant, 2 parts of a coupling agent, 25 parts of reinforcing fibers, 2 parts of 1,3,5-triglycidyl-S-triazinetrione, and 4 parts of 1-amino-8-naphthol-3,6-disulfonic acid; the functional polycondensate is prepared by polycondensation reaction of 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, and N,N'-bis(2-hydroxyethyl)piperazine.

[0031] The preparation method of the functional polycondensate comprises the following steps: adding 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, N,N'-bis(2-hydroxyethyl)piperazine and a catalyst into a high boiling point solvent, stirring at 115°C for 3 hours to obtain a reaction solution, then adding the reaction solution into a high pressure reactor, closing the feed port after the addition is completed, replacing the air in the reactor with an inert gas, then stirring and reacting at 145°C under normal pressure for 4 hours, then reducing the pressure to 75 Pa, heating to 255°C, and stirring and reacting at the temperature and pressure for 18 hours. After the reaction is completed, the mixture is cooled to room temperature, precipitated in water, and the precipitated polymer is washed 5 times with ethanol, and finally dried in a vacuum dryer at 90°C to constant weight to obtain a functional polycondensate; the molar ratio of 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, N,N'-bis(2-hydroxyethyl)piperazine, catalyst, and high boiling point solvent is 1:0.8:0.2:0.8:8; the high boiling point solvent is N-methylpyrrolidone; the catalyst is antimony glycol; the inert gas is neon; and the high boiling point solvent is dimethyl sulfoxide.

[0032] The antioxidant is antioxidant 1010; the lubricant is paraffin; the coupling agent is silane coupling agent KH570; the reinforcing fiber is alkali-free chopped glass fiber, with an average diameter of 6 μm and an aspect ratio of 25:1.

[0033] A preparation method of the heat-resistant and oxygen-aging polyester material comprises the following steps: uniformly mixing the raw materials according to weight to obtain a mixture, and then adding the mixture into a twin-screw extruder for extrusion molding to obtain the heat-resistant and oxygen-aging polyester material; the extrusion temperature of the twin-screw extruder is 250°C and the screw speed is 310r / min.

[0034] Example 4

[0035] A heat-resistant oxidative aging polyester material comprises the following raw materials in parts by weight: 100 parts of functional polycondensate, 0.9 parts of phosphorus pentoxide, 0.45 parts of polyphosphoric acid, 1.4 parts of antioxidant, 0.75 parts of lubricant, 2.5 parts of coupling agent, 28 parts of reinforcing fiber, 2.5 parts of 1,3,5-triglycidyl-S-triazinetrione, and 4.5 parts of 1-amino-8-naphthol-3,6-disulfonic acid; the functional polycondensate is prepared by polycondensation reaction of 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, and N,N'-bis(2-hydroxyethyl)piperazine.

[0036] The preparation method of the functional polycondensate comprises the following steps: adding 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, N,N'-bis(2-hydroxyethyl)piperazine and a catalyst into a high boiling point solvent, stirring at 122°C for 3.5 hours to obtain a reaction solution, then adding the reaction solution into a high pressure reactor, closing the feed port after the addition is completed, replacing the air in the reactor with an inert gas, then stirring and reacting at 153°C under normal pressure for 4.5 hours, then reducing the pressure to 90 Pa, heating to 263°C, and stirring and reacting at the temperature and pressure for 19 hours. After the reaction is completed, the mixture is cooled to room temperature, precipitated in water, and the precipitated polymer is washed 5 times with ethanol, and finally dried in a vacuum dryer at 93°C to constant weight to obtain a functional polycondensate; the molar ratio of 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, N,N'-bis(2-hydroxyethyl)piperazine, catalyst, and high boiling point solvent is 1:0.8:0.2:0.95:9.5; the high boiling point solvent is N-methylpyrrolidone; the catalyst is antimony glycol; the inert gas is neon; and the high boiling point solvent is dimethyl sulfoxide.

[0037] The antioxidant is antioxidant 1010; the lubricant is paraffin; the coupling agent is a mixture of silane coupling agent KH550, silane coupling agent KH560 and silane coupling agent KH570 in a mass ratio of 1:2:1; the reinforcing fiber is alkali-free chopped glass fiber with an average diameter of 8 μm and an aspect ratio of 28:1.

[0038] A preparation method of the heat-resistant and oxygen-aging polyester material comprises the following steps: uniformly mixing the raw materials according to weight to obtain a mixture, and then adding the mixture into a twin-screw extruder for extrusion molding to obtain the heat-resistant and oxygen-aging polyester material; the extrusion temperature of the twin-screw extruder is 255°C and the screw speed is 340r / min.

[0039] Example 5

[0040] A heat-resistant and oxygen-aging polyester material comprises the following raw materials in parts by weight: 100 parts of a functional polycondensate, 1 part of phosphorus pentoxide, 0.5 parts of polyphosphoric acid, 1.5 parts of an antioxidant, 0.8 parts of a lubricant, 3 parts of a coupling agent, 30 parts of reinforcing fibers, 3 parts of 1,3,5-triglycidyl-S-triazinetrione, and 5 parts of 1-amino-8-naphthol-3,6-disulfonic acid; the functional polycondensate is prepared by polycondensation of 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, and N,N'-bis(2-hydroxyethyl)piperazine.

[0041] The preparation method of the functional polycondensate comprises the following steps: adding 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, N,N'-bis(2-hydroxyethyl)piperazine and a catalyst into a high boiling point solvent, stirring at 125°C for 4 hours to obtain a reaction solution, then adding the reaction solution into a high pressure reactor, closing the feed port after the addition is completed, passing an inert gas to replace the air in the reactor, then stirring and reacting at 155°C under normal pressure for 5 hours, then reducing the pressure to 100 Pa, heating to 265°C, and stirring and reacting while maintaining the temperature and pressure. 20 hours, after the reaction is completed, cool to room temperature, precipitate in water, wash the precipitated polymer with ethanol 6 times, and finally place it in a vacuum dryer and dry it at 95°C to constant weight to obtain a functional condensation polymer; the molar ratio of 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, N,N'-bis(2-hydroxyethyl)piperazine, catalyst, and high boiling point solvent is 1:0.8:0.2:1:10; the high boiling point solvent is dimethyl sulfoxide; the catalyst is ethylene glycol antimony; the inert gas is nitrogen; the high boiling point solvent is dimethyl sulfoxide.

[0042] The antioxidant is antioxidant 1010; the lubricant is polydimethylsiloxane; the coupling agent is silane coupling agent KH560; the reinforcing fiber is alkali-free chopped glass fiber, with an average diameter of 9 μm and an aspect ratio of 30:1.

[0043] A preparation method of the heat-resistant and oxygen-aging polyester material comprises the following steps: uniformly mixing the raw materials according to weight to obtain a mixture, and then adding the mixture into a twin-screw extruder for extrusion molding to obtain the heat-resistant and oxygen-aging polyester material; the extrusion temperature of the twin-screw extruder is 260°C and the screw speed is 350r / min.

[0044] Comparative Example 1

[0045] A polyester material resistant to heat and oxygen aging is substantially the same as Example 1, except that 1-amino-8-naphthol-3,6-disulfonic acid is not added.

[0046] Comparative Example 2

[0047] A heat-oxidative aging-resistant polyester material is substantially the same as Example 1, except that 1,3,5-triglycidyl-S-triazinetrione is not added.

[0048] In order to further illustrate the unexpected positive technical effects achieved by the products of each embodiment of the present invention, the heat-resistant and oxygen-aging-resistant polyester materials prepared in each embodiment are tested for relevant properties. The test results are shown in Table 1. The test method is as follows:

[0049] (1) Tensile properties: The tensile strength is tested according to GB / T 1040.1-2018.

[0050] (2) Resistance to heat and oxygen aging: Each product was placed in a forced air drying oven at 120°C for 8 h. The heat and oxygen aging resistance was measured by the retention rate of tensile strength. The larger the value, the better the heat and oxygen aging resistance.

[0051] (3) Flame retardancy: tested according to UL-94.

[0052] Table 1

[0053] project Tensile Strength Flame retardant Heat and oxygen aging resistance unit MPa class ％ Example 1 105.1 V-0 99.13 Example 2 106.3 V-0 99.38 Example 3 107.0 V-0 99.50 Example 4 108.5 V-0 99.69 Example 5 109.4 V-0 99.81 Comparative Example 1 96.3 V-1 97.15 Comparative Example 2 94.7 V-1 98.58

[0054] It can be seen from Table 1 that the heat-oxidative aging-resistant polyester material disclosed in the embodiment of the present invention has better mechanical properties, flame retardancy and heat-oxidative aging resistance than the comparative example product, and the addition of 1-amino-8-naphthol-3,6-disulfonic acid and 1,3,5-triglycidyl-S-triazinetrione is beneficial to improving the above properties.

[0055] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as described above. However, any technician familiar with the profession can make some changes, modifications and evolutions of the technical content disclosed above without departing from the scope of the technical solution of the present invention, which are all equivalent embodiments of the present invention. At the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A heat-oxidative aging-resistant polyester material, characterized in that: The invention comprises the following raw materials in parts by weight: 100 parts of functional polycondensate, 0.5-1 parts of phosphorus pentoxide, 0.3-0.5 parts of polyphosphoric acid, 0.8-1.5 parts of antioxidant, 0.5-0.8 parts of lubricant, 1-3 parts of coupling agent, 20-30 parts of reinforcing fiber, 1-3 parts of 1,3,5-triglycidyl-S-triazinetrione and 3-5 parts of 1-amino-8-naphthol-3,6-disulfonic acid; the functional polycondensate is prepared by polycondensation reaction of 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol and N,N'-bis(2-hydroxyethyl)piperazine.

2. The heat-oxidative aging-resistant polyester material according to claim 1, characterized in that: The preparation method of the functional polycondensate comprises the following steps: adding 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, N,N'-bis(2-hydroxyethyl)piperazine and a catalyst into a high boiling point solvent, stirring at 105-125°C for 2-4 hours to obtain a reaction solution, then adding the reaction solution into a high pressure reactor, closing the feed port after the addition, introducing an inert gas to replace the air in the reactor, stirring and reacting at 135-155°C under normal pressure for 3-5 hours, then reducing the pressure to 50-100 Pa, heating to 245-265°C, stirring and reacting at the same temperature and pressure for 15-20 hours, cooling to room temperature after the reaction, precipitating in water, washing the precipitated polymer with ethanol for 3-6 times, and finally drying in a vacuum dryer at 85-95°C to a constant weight to obtain the functional polycondensate.

3. The heat-oxidative aging-resistant polyester material according to claim 2, characterized in that: The molar ratio of the 5-hydroxyisophthalic acid, 2,3,5,6-tetrafluorophenylenedimethanol, N,N'-bis(2-hydroxyethyl)piperazine, catalyst and high boiling point solvent is 1:0.8:0.2:(0.6-1):(6-10).

4. The heat-oxidative aging-resistant polyester material according to claim 2, characterized in that: The high boiling point solvent is at least one of dimethyl sulfoxide, N,N-dimethylformamide, and N-methylpyrrolidone; the catalyst is antimony glycol; the inert gas is any one of nitrogen, helium, neon, and argon; and the high boiling point solvent is dimethyl sulfoxide.

5. The heat-oxidative aging-resistant polyester material according to claim 1, characterized in that: The antioxidant is at least one of antioxidant 1010 and antioxidant 168; the lubricant is at least one of paraffin and polydimethylsiloxane; the coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570.

6. The heat-oxidative aging-resistant polyester material according to claim 1, characterized in that: The reinforcing fiber is alkali-free chopped glass fiber with an average diameter of 3-9 μm and an aspect ratio of (20-30):

1.

7. A method for preparing the heat-oxidative aging-resistant polyester material according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: uniformly mixing the raw materials according to weight to obtain a mixed material, and then adding the mixed material into a twin-screw extruder for extrusion molding to obtain a heat-resistant and oxygen-aging-resistant polyester material.

8. The method for preparing the heat-oxidative aging-resistant polyester material according to claim 7, characterized in that: The extrusion temperature of the twin-screw extruder is 240-260° C., and the screw speed is 240-350 r / min.