An ultraviolet resistant weatherable polymer composite and method of processing the same

Abstract

The application discloses an anti-ultraviolet weather-resistant polymer composite material and a processing method thereof, and relates to the technical field of polymer composite materials. The weather-resistant polymer composite material raw material comprises a weather-resistant resin matrix, functionalized carbon fibers, a triazine-based covalent organic framework and an additive. The finished product is prepared through mixing, melt extrusion and injection molding. The material has excellent mechanical properties, thermal stability and anti-ultraviolet aging capacity, is stable in processing and uniform in size, is suitable for outdoor high-demand scenes, and has industrial application potential.

Description

Technical Field

[0001] This invention relates to the field of polymer composite materials technology, specifically to an ultraviolet-resistant and weather-resistant polymer composite material and its processing method. Background Technology

[0002] In current applications in outdoor engineering and other fields, the performance requirements for materials are increasingly demanding. Existing materials generally suffer from insufficient UV resistance; long-term exposure to UV light easily leads to molecular chain degradation, aging, and cracking, resulting in a significant decrease in mechanical strength and a shortened service life. Simultaneously, most composite materials exhibit poor interfacial compatibility and uneven dispersion, affecting overall performance stability. Some weather-resistant modification schemes only enhance UV resistance, sacrificing mechanical strength or processing fluidity, making it difficult to meet diverse application needs. Furthermore, traditional modification processes are complex and costly, and may suffer from issues such as easy migration of modifiers and insufficient durability of effects, limiting their widespread application in demanding outdoor scenarios.

[0003] Therefore, developing a polymer composite material that combines excellent resistance to ultraviolet aging, mechanical properties, thermal stability, and ease of processing has become a technical challenge that the industry urgently needs to solve. Summary of the Invention

[0004] The purpose of this invention is to provide a UV-resistant and weather-resistant polymer composite material and its processing method to solve the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A UV-resistant and weather-resistant polymer composite material, wherein the raw materials of the polymer composite material, by mass parts, include 60-75 parts of weather-resistant resin matrix, 10-15 parts of functionalized carbon fiber, 3-5 parts of triazine-based covalent organic framework, 0.5-1 part of antioxidant, 0.3-0.8 parts of lubricant, and 1-3 parts of compatibilizer; Furthermore, the weather-resistant resin matrix is ​​prepared from polyphenylene sulfide and hyperbranched polyphenylene sulfone in a mass ratio of (70-80):(20-30); Furthermore, the functionalized carbon fiber is prepared by sequentially modifying carbon fiber with 4-nitroaniline, thiophene compound, and cyanostilbene conjugated group; Furthermore, the polyphenylene sulfide is unfilled and has a density of 1350 kg / m³. 3 The tensile modulus is 66 MPa; Furthermore, the carbon fiber is of type T-300, with a fiber length of 200-300μm and a surface roughness of 0.2-0.5μm; Furthermore, the antioxidant is antioxidant 1010; Furthermore, the lubricant is ethylene bis-stearamide; Furthermore, the compatibilizer is maleic anhydride-grafted polyphenylene sulfide, and the grafting rate of maleic anhydride-grafted polyphenylene sulfide is 1.5-2%; Furthermore, the preparation process of the hyperbranched polyphenylene sulfone includes the following steps: 3,5-Dichlorobenzylthiophenol and anhydrous potassium carbonate were added to N-methylpyrrolidone and heated to 150-155℃ under a nitrogen atmosphere with stirring for 6-8 hours. After cooling, the mixture was poured into a 6 mol / L hydrochloric acid solution to precipitate. The solid was collected by filtration, dissolved in tetrahydrofuran, and then redeprecipitated in n-hexane. The solid was dried under vacuum to obtain hyperbranched polyphenylene sulfide. The hyperbranched polyphenylene sulfide was added to a mixed solution of 36% hydrogen peroxide and glacial acetic acid and refluxed for 4-5 hours. After cooling, the mixture was poured into a saturated sodium bicarbonate solution to precipitate. The precipitate was filtered, washed with water until neutral, and dried under vacuum to obtain hyperbranched polyphenylene sulfone. Furthermore, in the mixed solution of 36% hydrogen peroxide and glacial acetic acid, the volume ratio of 36% hydrogen peroxide to glacial acetic acid is (6-12):(10-20). Furthermore, in the preparation process of the hyperbranched polyphenylene sulfide, the molar ratio of 3,5-dichlorobenzylthiophenol to anhydrous potassium carbonate is (1-2):(3-6); Furthermore, in the preparation process of the hyperbranched polyphenylene sulfone, 18-36 mL of a mixture of 36% hydrogen peroxide and 200 mL of glacial acetic acid is added to every 1-2 g of hyperbranched polyphenylene sulfide. Furthermore, the preparation method of the triazine-based covalent organic framework includes the following steps: 1,3,5-tris(4-aminophenyl)benzene and 2,5-dihydroxyterephthalaldehyde were added to N,N-dimethylformamide, and trifluoroacetic acid catalyst was added. The mixture was heated to 80-85℃ and reacted for 24 h to obtain the initial product. The initial product was ultrasonically dispersed in deionized water, heated to 70-75℃ and aged for 24 h. The precipitate was collected by centrifugation and dried under vacuum to obtain a triazine covalent organic framework. Furthermore, in the preparation of the triazine covalent organic framework, the molar ratio of 1,3,5-tris(4-aminophenyl)benzene: 2,5-dihydroxyterephthalaldehyde: trifluoroacetic acid is 3:3:0.1; Furthermore, the method for preparing the functionalized carbon fiber includes the following steps: T-300 carbon fiber fabric was added to acetone and extracted for 24 hours using a Soxhlet extractor to remove the sizing agent on the fabric surface. After vacuum drying, degummed carbon fiber was obtained. A three-electrode electrochemical cell was formed using the degummed carbon fiber as the working electrode, a silver-silver chloride electrode as the reference electrode, and the carbon fiber fabric as the counter electrode for electrochemical modification. After the reaction was completed, the fabric was washed sequentially with chloroform, dichloromethane, ethanol, and acetone, and then vacuum dried to obtain grafted carbon fiber. Furthermore, the electrolyte in the three-electrode electrochemical cell is prepared by mixing 4-6 mM 4-nitroaniline solution, 25-30 mM sodium nitrite dissolved in 1 mM hydrochloric acid solution and distilled water in a volume ratio of 1:1. Furthermore, the electrochemical modification parameters are: potential range -1V to +1V, scan rate of 0.01-0.02V / s, and number of cycles of 40-50. 4-Aminothiophenol and 2,5-hexanedione were added to a reaction vessel and stirred at room temperature for 30-35 min under a nitrogen atmosphere. The mixture was then heated to 140-145 °C and stirred for 24 h. The mixture was then distilled under reduced pressure to obtain the benzothiophenol compound. Furthermore, in the preparation process of the thiophene compound, the mass ratio of 4-aminothiophenol to 2,5-hexanedione is 20.1:18.26; Grafted carbon fibers are immersed in an acetone solution of benzenethiophenol-based compounds, dried under vacuum, and cooled to obtain impregnated modified carbon fibers. The impregnated modified carbon fibers are added to N,N-dimethylformamide, 4-nitrobenzaldehyde, triethylamine, and 4-dimethylaminopyridine, heated to 70-75℃ and reacted for 10-12 hours. The mixture is then precipitated with methanol and dried under vacuum to obtain functionalized carbon fibers. Furthermore, in the preparation process of the functionalized carbon fiber, the concentration of the acetone solution of the thiophenol compound is 4-6 g / L, the molar ratio of the thiophenol compound to 4-nitrobenzaldehyde is 2:1, the concentration of triethylamine is 0.5-0.6 mmol / mL, and the concentration of 4-dimethylaminopyridine is 0.2-0.3 mmol / mL. A method for preparing an UV-resistant and weather-resistant polymer composite material includes the following steps: S1: Weather-resistant resin matrix, functionalized carbon fiber, triazine covalent organic framework, antioxidant, lubricant and compatibilizer are added sequentially to a mixer, heated to 80-85℃ and mixed for 30-45 minutes to obtain a mixture. S2: Add the mixture to a twin-screw extruder, melt-extrude, cool, and pelletize to obtain composite granules; S3: Place the composite particles in a vacuum dryer at 160-165℃, add them to an injection molding machine, and injection mold them to obtain a weather-resistant polymer composite material.

[0006] Furthermore, the temperature gradient of the melt extrusion process is set as follows: Zone 1 280-285℃, Zone 2 290-295℃, Zone 3 300-305℃, Zone 4 310-315℃, Zone 5 310-315℃, and die head 310-315℃. Furthermore, in the injection molding process, the temperature of the feeding zone is 290-295℃, the temperature of the compression zone is 295-300℃, the temperature of the metering zone is 300-305℃, the nozzle temperature is 300-305℃, the mold temperature is 60-80℃, the injection pressure is 80-100MPa, the cooling rate is 10-15℃ / min, and the holding time is 15-20s.

[0007] Compared with the prior art, the beneficial effects of the present invention are: 1. In the weather-resistant resin matrix of this invention, polyphenylene sulfide provides basic structural strength and chemical resistance, while hyperbranched polyphenylene sulfone reinforces it with high glass transition temperature and thermal stability. Its hyperbranched structure fills the gaps between polyphenylene sulfide molecular chains, optimizing matrix compatibility and processing fluidity. Functionalized carbon fibers undergo three-stage modification. The amine groups formed by electrochemical grafting of 4-nitroaniline construct hydrogen bonds and covalent bonds with PPS sulfur atoms. The thiophenol groups consolidate the interfacial bonding through covalent bonds. The cyanostilbene conjugated groups absorb ultraviolet light with a π-π conjugated structure, thus strengthening the fiber-matrix interface through a triple effect. The mesoporous structure of the triazine covalent organic framework scatters phonons and forms a UV absorption-scattering synergistic system with cyanostilbene. Antioxidants inhibit thermo-oxidative aging, lubricants reduce processing friction, and compatibilizers eliminate interfacial tension between components, helping to ensure processing and usage stability. Electrochemical grafting, dip coating, and other modification processes gently preserve fiber integrity, while melt extrusion and injection molding achieve uniform dispersion of components.

[0008] 2. The polymer composite material prepared by this invention has stable processing, good melt flowability, and uniform product size. Under the synergistic effect of each component, the material is not prone to aging or cracking during long-term use, making it suitable for high-requirement outdoor scenarios. Moreover, the preparation process is simple and controllable, and it has the potential for industrial application. Detailed Implementation

[0009] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0010] In the following embodiments, the preparation process of hyperbranched polyphenylene sulfone includes the following steps: 100 mmol of 3,5-dichlorothiophenol and 300 mmol of anhydrous potassium carbonate were added to 100 mL of N-methylpyrrolidone. The mixture was heated to 150 °C and stirred for 7 h under a nitrogen atmosphere. After cooling, the mixture was poured into a 6 mol / L hydrochloric acid solution to precipitate. The solid was collected by filtration, dissolved in tetrahydrofuran, and then redeprecipitated in n-hexane. The solid was dried under vacuum to obtain hyperbranched polyphenylene sulfide. 20 g of hyperbranched polyphenylene sulfide was added to a mixed solution of 120 mL of 36% hydrogen peroxide and 200 mL of glacial acetic acid. The mixture was refluxed for 4 h. After cooling, the solid was poured into a saturated sodium bicarbonate solution to precipitate. The precipitate was filtered, washed with water until neutral, and dried under vacuum to obtain hyperbranched polyphenylene sulfone. The method for preparing a triazine-based covalent organic framework includes the following steps: 3 mmol of 1,3,5-tris(4-aminophenyl)benzene and 3 mmol of 2,5-dihydroxyterephthalaldehyde were added to 50 mL of N,N-dimethylformamide, and 0.1 mmol of trifluoroacetic acid catalyst was added. The mixture was heated to 80 °C and reacted for 24 h to obtain the initial product. The initial product was ultrasonically dispersed in deionized water, heated to 70 °C and aged for 24 h. The precipitate was collected by centrifugation and dried under vacuum to obtain a triazine covalent organic framework. The preparation method of functionalized carbon fiber includes the following steps: T-300 carbon fiber fabric was added to acetone and extracted for 24 hours using a Soxhlet extractor to remove the sizing agent on the fabric surface. After vacuum drying, degummed carbon fiber was obtained. A three-electrode electrochemical cell was formed using the degummed carbon fiber as the working electrode, a silver-silver chloride electrode as the reference electrode, and the carbon fiber fabric as the counter electrode for electrochemical modification. After the reaction was completed, the fabric was washed sequentially with chloroform, dichloromethane, ethanol, and acetone, and then vacuum dried to obtain grafted carbon fiber. The electrolyte in the three-electrode electrochemical cell is prepared by mixing 6 mM 4-nitroaniline solution, 30 mM sodium nitrite solution dissolved in 1 mM hydrochloric acid solution and distilled water in a volume ratio of 1:1. The electrochemical modification parameters are: potential range -1V to +1V, scan rate of 0.01V / s, and number of cycles of 40. 20.1 mmol of 4-aminothiophenol and 18.26 mmol of 2,5-hexanedione were added to a reaction vessel and stirred at room temperature for 30 min under a nitrogen atmosphere. The mixture was then heated to 140 °C and stirred for 24 h. The mixture was then distilled under reduced pressure to obtain the benzothiophenol compound. Grafted carbon fibers were immersed in an acetone solution containing 4 g / L benzenethiophenol compound, dried under vacuum, and cooled to obtain impregnated modified carbon fibers. The impregnated modified carbon fibers were then added to N,N-dimethylformamide, along with 4-nitrobenzaldehyde, triethylamine, and 4-dimethylaminopyridine. The mixture was heated to 70°C and reacted for 10 h. The mixture was then precipitated with methanol and dried under vacuum to obtain functionalized carbon fibers. The molar ratio of thiophenolic compounds to 4-nitrobenzaldehyde is 2:1, the concentration of triethylamine is 0.5 mmol / mL, and the concentration of 4-dimethylaminopyridine is 0.2 mmol / mL.

[0011] Example 1: A method for preparing an UV-resistant and weather-resistant polymer composite material, comprising the following steps: S1: 70 parts of weather-resistant resin matrix, 12 parts of functionalized carbon fiber, 4 parts of triazine-based covalent organic framework, 0.7 parts of antioxidant 1010, 0.5 parts of ethylene bis-stearamide, and 2 parts of maleic anhydride-grafted polyphenylene sulfide are sequentially added to a mixer and heated to 80°C for 30 minutes to obtain a mixture; wherein, the weather-resistant resin matrix is ​​prepared by polyphenylene sulfide and hyperbranched polyphenylene sulfone at a mass ratio of 75:25; S2: Add the mixture to a twin-screw extruder, melt-extrude, cool, and pelletize to obtain composite granules; S3: Place the composite particles in a vacuum dryer at 160℃, add them to an injection molding machine, and injection mold them to obtain a weather-resistant polymer composite material.

[0012] Example 2: A method for preparing an UV-resistant and weather-resistant polymer composite material, comprising the following steps: S1: 70 parts of weather-resistant resin matrix, 15 parts of functionalized carbon fiber, 5 parts of triazine-based covalent organic framework, 1 part of antioxidant 1010, 0.8 parts of ethylene bis-stearamide, and 3 parts of maleic anhydride-grafted polyphenylene sulfide are sequentially added to a mixer and heated to 80°C for 30 minutes to obtain a mixture; wherein, the weather-resistant resin matrix is ​​prepared by polyphenylene sulfide and hyperbranched polyphenylene sulfone at a mass ratio of 70:30; S2: Add the mixture to a twin-screw extruder, melt-extrude, cool, and pelletize to obtain composite granules; S3: Place the composite particles in a vacuum dryer at 160℃, add them to an injection molding machine, and injection mold them to obtain a weather-resistant polymer composite material.

[0013] Example 3: A method for preparing an UV-resistant and weather-resistant polymer composite material, comprising the following steps: S1: 70 parts of weather-resistant resin matrix, 10 parts of functionalized carbon fiber, 3 parts of triazine covalent organic framework, 0.5 parts of antioxidant 1010, 0.3 parts of ethylene bis-stearamide, and 1 part of maleic anhydride-grafted polyphenylene sulfide are sequentially added to a mixer and heated to 80°C for 30 minutes to obtain a mixture; wherein, the weather-resistant resin matrix is ​​prepared by polyphenylene sulfide and hyperbranched polyphenylene sulfone at a mass ratio of 80:20; S2: Add the mixture to a twin-screw extruder, melt-extrude, cool, and pelletize to obtain composite granules; S3: Place the composite particles in a vacuum dryer at 160℃, add them to an injection molding machine, and injection mold them to obtain a weather-resistant polymer composite material.

[0014] Comparative Example 1: A method for preparing an UV-resistant and weather-resistant polymer composite material, comprising the following steps: S1: 70 parts of polyphenylene sulfide, 12 parts of functionalized carbon fiber, 4 parts of triazine covalent organic framework, 0.7 parts of antioxidant 1010, 0.5 parts of ethylene bis-stearamide, and 2 parts of maleic anhydride-grafted polyphenylene sulfide are sequentially added to a mixer, heated to 80°C and mixed for 30 minutes to obtain a mixture; S2: Add the mixture to a twin-screw extruder, melt-extrude, cool, and pelletize to obtain composite granules; S3: Place the composite particles in a vacuum dryer at 160℃, add them to an injection molding machine, and injection mold them to obtain a weather-resistant polymer composite material.

[0015] Comparative Example 2: A method for preparing an UV-resistant and weather-resistant polymer composite material, comprising the following steps: S1: 70 parts of weather-resistant resin matrix, 12 parts of carbon fiber, 4 parts of triazine covalent organic framework, 0.7 parts of antioxidant 1010, 0.5 parts of ethylene bis-stearamide, and 2 parts of maleic anhydride-grafted polyphenylene sulfide are sequentially added to a mixer and heated to 80°C for 30 minutes to obtain a mixture; wherein, the weather-resistant resin matrix is ​​prepared from polyphenylene sulfide and hyperbranched polyphenylene sulfone at a mass ratio of 75:25; S2: Add the mixture to a twin-screw extruder, melt-extrude, cool, and pelletize to obtain composite granules; S3: Place the composite particles in a vacuum dryer at 160℃, add them to an injection molding machine, and injection mold them to obtain a weather-resistant polymer composite material.

[0016] Comparative Example 3: A method for preparing an UV-resistant and weather-resistant polymer composite material, comprising the following steps: S1: 70 parts of weather-resistant resin matrix, 12 parts of functionalized carbon fiber, 0.7 parts of antioxidant 1010, 0.5 parts of ethylene bis-stearamide, and 2 parts of maleic anhydride-grafted polyphenylene sulfide are sequentially added to a mixer and heated to 80°C for 30 minutes to obtain a mixture; wherein, the weather-resistant resin matrix is ​​prepared by polyphenylene sulfide and hyperbranched polyphenylene sulfone at a mass ratio of 75:25; S2: Add the mixture to a twin-screw extruder, melt-extrude, cool, and pelletize to obtain composite granules; S3: Place the composite particles in a vacuum dryer at 160℃, add them to an injection molding machine, and injection mold them to obtain a weather-resistant polymer composite material.

[0017] Comparative Example 4: A method for preparing an UV-resistant and weather-resistant polymer composite material, comprising the following steps: S1: 70 parts of weather-resistant resin matrix, 12 parts of functionalized carbon fiber, 4 parts of triazine-based covalent organic framework, 0.7 parts of antioxidant 1010, 0.5 parts of ethylene bis-stearamide, and 2 parts of maleic anhydride-grafted polyphenylene sulfide are sequentially added to a mixer and heated to 80°C for 30 minutes to obtain a mixture; wherein, the weather-resistant resin matrix is ​​prepared from polyphenylene sulfide and hyperbranched polyphenylene sulfone at a mass ratio of 75:25; S2: Add the mixture to a twin-screw extruder, melt-extrude, cool, and pelletize to obtain composite granules; S3: Place the composite particles in a vacuum dryer at 160℃, add them to an injection molding machine, and injection mold them to obtain a weather-resistant polymer composite material.

[0018] The preparation method of functionalized carbon fiber includes the following steps: T-300 carbon fiber fabric was added to acetone and extracted for 24 hours using a Soxhlet extractor to remove the sizing agent on the fabric surface. After vacuum drying, degummed carbon fiber was obtained. A three-electrode electrochemical cell was formed using the degummed carbon fiber as the working electrode, a silver-silver chloride electrode as the reference electrode, and the carbon fiber fabric as the counter electrode for electrochemical modification. After the reaction was completed, the fabric was washed sequentially with chloroform, dichloromethane, ethanol, and acetone, and then vacuum dried to obtain grafted carbon fiber. The electrolyte in the three-electrode electrochemical cell is prepared by mixing 6 mM 4-nitroaniline solution, 30 mM sodium nitrite solution dissolved in 1 mM hydrochloric acid solution and distilled water in a volume ratio of 1:1. The electrochemical modification parameters are: potential range -1V to +1V, scan rate of 0.01V / s, and number of cycles of 40. 20.1 mmol of 4-aminothiophenol and 18.26 mmol of 2,5-hexanedione were added to a reaction vessel and stirred at room temperature for 30 min under a nitrogen atmosphere. The mixture was then heated to 140 °C and stirred for 24 h. The mixture was then distilled under reduced pressure to obtain the benzothiophenol compound. Grafted carbon fibers were immersed in an acetone solution containing 4 g / L of thiophenol-based compound, vacuum dried, and cooled to obtain functionalized carbon fibers.

[0019] Performance testing: Mechanical properties: Tensile properties were tested using a universal testing machine according to ASTM D638 at a rate of 5 mm / min, and bending properties were tested according to ASTM D790 at a rate of 2 mm / min. UV resistance: The composite material was placed in a UV aging chamber equipped with a UVB-313nm fluorescent lamp, with an initial radiation intensity of 0.63W / m². 2 The total radiation measurement is 1000 kJ / m². 2 Test the retention rate of mechanical properties of composite materials; Thermal stability performance: Tested using a thermogravimetric analyzer under the following conditions: nitrogen atmosphere, 10℃ / min, 35-800℃.

[0020] The performance test results are shown in Table 1 below.

[0021] Table 1. Test Results of Weather-Resistant Polymer Composite Materials Conclusion: This invention achieves a balance between UV resistance, weather resistance, mechanical properties, and processability of materials through the synergistic design and optimized process of each component. The product is suitable for high-requirement outdoor scenarios and has broad prospects for industrial application.

[0022] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A UV-resistant and weather-resistant polymer composite material, wherein the raw materials of the polymer composite material, by mass parts, include 60-75 parts of weather-resistant resin matrix, 10-15 parts of functionalized carbon fiber, 3-5 parts of triazine-based covalent organic framework, 0.5-1 parts of antioxidant, 0.3-0.8 parts of lubricant, and 1-3 parts of compatibilizer; The weather-resistant resin matrix is ​​prepared by mixing polyphenylene sulfide and hyperbranched polyphenylene sulfone in a mass ratio of (70-80):(20-30); The functionalized carbon fiber is prepared by sequentially modifying carbon fiber with 4-nitroaniline, thiophene compound, and cyanostilbene conjugated group.

2. The UV-resistant and weather-resistant polymer composite material according to claim 1, characterized in that: The preparation process of the hyperbranched polyphenylene sulfone includes the following steps: 3,5-Dichlorobenzylthiophenol and anhydrous potassium carbonate were added to N-methylpyrrolidone and heated to 150-155℃ under a nitrogen atmosphere with stirring for 6-8 hours. After cooling, the mixture was poured into a 6 mol / L hydrochloric acid solution to precipitate. The solid was collected by filtration, dissolved in tetrahydrofuran, and then redeprecipitated in n-hexane. The solid was dried under vacuum to obtain hyperbranched polyphenylene sulfide. The hyperbranched polyphenylene sulfide was added to a mixed solution of 36% hydrogen peroxide and glacial acetic acid and refluxed for 4-5 hours. After cooling, the mixture was poured into a saturated sodium bicarbonate solution to precipitate. The precipitate was filtered, washed with water until neutral, and dried under vacuum to obtain hyperbranched polyphenylene sulfone.

3. The UV-resistant and weather-resistant polymer composite material according to claim 2, characterized in that: In the mixed solution of 36% hydrogen peroxide and glacial acetic acid, the volume ratio of 36% hydrogen peroxide to glacial acetic acid is (6-12):(10-20). In the preparation of hyperbranched polyphenylene sulfide, the molar ratio of 3,5-dichlorobenzylthiophenol to anhydrous potassium carbonate is (1-2):(3-6). In the preparation of hyperbranched polyphenylene sulfone, 18-36 mL of a mixture of 36% hydrogen peroxide and 200 mL of glacial acetic acid is added to every 1-2 g of hyperbranched polyphenylene sulfide.

4. The UV-resistant and weather-resistant polymer composite material according to claim 1, characterized in that: The method for preparing the triazine-based covalent organic framework includes the following steps: 1,3,5-tris(4-aminophenyl)benzene and 2,5-dihydroxyterephthalaldehyde were added to N,N-dimethylformamide, and trifluoroacetic acid catalyst was added. The mixture was heated to 80-85℃ and reacted for 24 h to obtain the initial product. The initial product was ultrasonically dispersed in deionized water, heated to 70-75℃ and aged for 24 h. The precipitate was collected by centrifugation and dried under vacuum to obtain a triazine covalent organic framework.

5. The UV-resistant and weather-resistant polymer composite material according to claim 4, characterized in that: In the preparation of the triazine covalent organic framework, the molar ratio of 1,3,5-tris(4-aminophenyl)benzene: 2,5-dihydroxyterephthalaldehyde: trifluoroacetic acid is 3:3:0.

1.

6. The UV-resistant and weather-resistant polymer composite material according to claim 1, characterized in that: The method for preparing the functionalized carbon fiber includes the following steps: T-300 carbon fiber fabric was added to acetone and extracted for 24 hours using a Soxhlet extractor to remove the sizing agent on the fabric surface. After vacuum drying, degummed carbon fiber was obtained. A three-electrode electrochemical cell was formed using the degummed carbon fiber as the working electrode, a silver-silver chloride electrode as the reference electrode, and the carbon fiber fabric as the counter electrode for electrochemical modification. After the reaction was completed, the fabric was washed sequentially with chloroform, dichloromethane, ethanol, and acetone, and then vacuum dried to obtain grafted carbon fiber. Grafted carbon fibers are immersed in an acetone solution of benzenethiophenol-based compounds, dried under vacuum, and cooled to obtain impregnated modified carbon fibers. The impregnated modified carbon fibers are added to N,N-dimethylformamide, 4-nitrobenzaldehyde, triethylamine, and 4-dimethylaminopyridine, heated to 70-75℃ and reacted for 10-12 hours. The mixture is then precipitated with methanol and dried under vacuum to obtain functionalized carbon fibers.

7. The UV-resistant and weather-resistant polymer composite material according to claim 6, characterized in that: The electrolyte in the three-electrode electrochemical cell is prepared by mixing 4-6 mM 4-nitroaniline solution, 25-30 mM sodium nitrite solution dissolved in 1 mM hydrochloric acid solution and distilled water in a volume ratio of 1:

1. The electrochemical modification parameters are: potential range -1V to +1V, scan rate of 0.01-0.02V / s, and number of cycles of 40-50. In the preparation of functionalized carbon fibers, the concentration of the acetone solution of the thiophenol compound is 4-6 g / L, the molar ratio of the thiophenol compound to 4-nitrobenzaldehyde is 2:1, the concentration of triethylamine is 0.5-0.6 mmol / mL, and the concentration of 4-dimethylaminopyridine is 0.2-0.3 mmol / mL.

8. The UV-resistant and weather-resistant polymer composite material according to claim 6, characterized in that: 4-Aminothiophenol and 2,5-hexanedione were added to a reaction vessel and stirred at room temperature for 30-35 min under a nitrogen atmosphere. The mixture was then heated to 140-145 °C and stirred for 24 h. The mixture was then distilled under reduced pressure to obtain the thiophenol compound.

9. The UV-resistant and weather-resistant polymer composite material according to claim 8, characterized in that: In the preparation of thiophene compounds, the mass ratio of 4-aminothiophenol to 2,5-hexanedione is 20.1:18.

26.

10. A method for preparing an ultraviolet-resistant and weather-resistant polymer composite material, characterized in that: The preparation method of the polymer composite material according to any one of claims 1-9 Includes the following steps: S1: Add the weather-resistant resin matrix, functionalized carbon fiber, triazine covalent organic framework, antioxidant, lubricant, and compatibilizer to a mixer in sequence, heat to 80-85℃ and mix for 30-45 minutes to obtain a mixture. S2: Add the mixture to a twin-screw extruder, melt-extrude, cool, and pelletize to obtain composite granules; S3: Place the composite particles in a vacuum dryer at 160-165℃, add them to an injection molding machine, and injection mold them to obtain a weather-resistant polymer composite material.

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