High-weather-resistant pp material and preparation method thereof

Abstract

The application relates to the technical field of high polymer materials, and discloses a high-weather-resistance PP material and a preparation method thereof. The prepared PP material comprises the following raw materials in parts by weight: 50-60 parts of PP resin, 8-15 parts of maleic anhydride grafted POE, 15-20 parts of a composite reinforcing agent, 1-2 parts of a coupling agent, 0.1-0.5 parts of a lubricant and 0.1-0.3 parts of an antioxidant. The PP material has excellent weather resistance while keeping good mechanical properties, can keep good performance after aging, and remarkably prolongs the weather resistance life of the PP material.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, specifically to a high weather-resistant PP material and its preparation method. Background Technology

[0002] Polypropylene (PP), a general-purpose thermoplastic resin, is widely used in automotive interior and exterior trim, outdoor building materials, and photovoltaic backsheets due to its lightweight, chemical resistance, and good mechanical properties. However, the PP molecular backbone contains a large number of tertiary carbon atoms, making it extremely sensitive to ultraviolet (UV) radiation. During long-term outdoor use, UV radiation easily triggers photo-oxidative degradation of the PP molecular chain, generating alkyl free radicals, which in turn leads to chain breakage and cross-linking. Ultimately, this manifests as surface chalking, yellowing, and a sharp decrease in impact toughness, severely limiting its application in long-life outdoor scenarios.

[0003] To improve the weather resistance of PP, industrial manufacturers typically add small-molecule light stabilizers (such as benzotriazole UV absorbers and hindered amine free radical scavengers). However, traditional additives have significant shortcomings: firstly, both types of stabilizers have limited functions and are difficult to synergistically inhibit the initiation and propagation stages of photoaging; secondly, small-molecule additives are prone to migration, volatilization, and extraction during processing and use, leading to a decrease in protective effectiveness. Therefore, improving the weather resistance of PP materials and developing long-lasting, highly weather-resistant PP materials is a technical problem that needs to be solved. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a high weather-resistant PP material and its preparation method.

[0005] The objective of this invention can be achieved through the following technical solutions: A high weather-resistant PP material comprises the following raw materials in parts by weight: 50-60 parts PP resin, 8-15 parts maleic anhydride-grafted POE, 15-20 parts composite reinforcing agent, 1-2 parts coupling agent, 0.1-0.5 parts lubricant, and 0.1-0.3 parts antioxidant. Furthermore, the coupling agent is a titanate coupling agent; Furthermore, the lubricant is ethylene bis-stearamide; Furthermore, the antioxidant is a mixture of antioxidant 1010 and antioxidant 168, and the ratio of antioxidant 1010 to antioxidant 168 is 1:3; The composite reinforcing agent is prepared by the following steps: Step A1: Add 6-chlorohexanoyl chloride to tetrahydrofuran and stir until homogeneous in an ice-water bath, which is recorded as solution 1; add benzotriazole to tetrahydrofuran and stir until homogeneous, then add triethylamine and mix until homogeneous, then transfer to a 40℃ oil bath and add it dropwise to solution 1 using a separatory funnel, completing the addition in 30 minutes, then stir the reaction at a constant temperature for 4-5 hours, filter, rotary evaporate the filtrate, wash with water, filter again, and dry to obtain chlorobenzotriazole; Further, in step A1, the ratio of benzotriazole, tetrahydrofuran, triethylamine, and solution 1 in the chlorobenzotriazole is 0.02 mol: 50 mL: 0.02-0.022 mol: 50 mL; Further, in step A1, the ratio of 6-chlorohexanoyl chloride to tetrahydrofuran in solution 1 is 0.02-0.022 mol: 50 mL; Step A2: After stirring chlorobenzotriazole, triethylamine and dichloromethane evenly, 2,2,6,6-tetramethylpiperidineamine is slowly added dropwise under an ice-water bath. After the addition is completed, the mixture is heated to 40°C and refluxed for 8-12 hours. The mixture is then washed with water, separated, and the organic phase is collected and rotary evaporated to obtain the composite modifier. Further, in step A2, the ratio of chlorobenzotriazole, triethylamine, dichloromethane, and 2,2,6,6-tetramethylpiperidineamine is 0.1-0.2 mol: 0.1-0.2 mol: 150 mL: 0.11-0.24 mol; Step A3: Dissolve magnesium nitrate hexahydrate and aluminum nitrate nonahydrate in deionized water to remove CO2, and label this as the salt solution; heat the deionized water to 60-70℃, and add sodium hydroxide and stearic acid while stirring vigorously, label this as the alkaline solution; add the salt solution dropwise to the alkaline solution while stirring rapidly for 10 minutes; after the addition is complete, crystallize at room temperature for 30 minutes, wash 5 times by centrifugation with hot water, then add 0.133mol / L sodium stearate solution and stir evenly, stir vigorously at 95℃, and crystallize for 6 hours; after crystallization, wash repeatedly with hot ethanol and centrifuge 5 times, and dry to obtain the modified bilayer hydroxide; Further, in step A3, the ratio of magnesium nitrate hexahydrate, aluminum nitrate nonahydrate, and deionized water in the salt solution is 0.03-0.06 mol: 0.01-0.02 mol: 50 mL; Further, in step A3, the ratio of sodium hydroxide, stearic acid, and deionized water in the alkaline solution is 0.1-0.2 mol: 0.01-0.02 mol: 100 mL; Further, the ratio of the amount of salt solution, alkaline solution and sodium stearate solution used in step A3 is 50 mL, 100 mL: 150 mL; Step A4: Disperse the modified bilayer hydroxide in a mixture of ethanol and deionized water by ultrasonication for 30 min, then add the composite modifier, stir and react under nitrogen and 50℃ for 5.5-6.5 h, centrifuge, wash, and freeze dry to obtain the composite reinforcing agent; Furthermore, the composite reinforcing agent described in step A4 utilizes the molecular forces between the stearic acid and the composite modifier in the interlayer of the modified bilayer hydroxide (e.g., strong nonpolar dispersion forces generated between the long carbon chain of stearic acid and the long chain of the composite modifier and the benzene ring of benzotriazole, and hydrogen bonding between stearic acid and benzotriazole) to assemble the composite modifier into the interlayer of the bilayer hydroxide.

[0006] Further, the ratio of the modified bilayer hydroxide, ethanol, deionized water and composite modifier in step A4 is 0.5g:80mL:20mL:15-20g.

[0007] A method for preparing a high weather-resistant PP material includes the following steps: Weigh the raw materials according to the weight proportions, add the composite reinforcing agent and coupling agent to a high-speed mixer, and stir at 300-500 rpm for 5-8 minutes. Then add PP resin, maleic anhydride grafted POE, lubricant and antioxidant, and stir at 700-800 rpm for 5-10 minutes to form a premix. Then feed the premix into a twin-screw extruder for melt extrusion and granulation to obtain high weather-resistant PP material.

[0008] Furthermore, the temperatures of each section of the twin-screw extruder are as follows: Zone 1 165-175℃, Zone 2 180-185℃, Zone 3 190-200℃, Zone 4 190-200℃, Zone 5 180-190℃, and the die head 180-190℃.

[0009] The beneficial effects of this invention are: The PP material prepared by this invention is made by adding maleic anhydride-grafted POE, composite reinforcing agent, coupling agent, lubricant and antioxidant, with PP resin as the main raw material. While maintaining good mechanical properties, this PP material also has excellent weather resistance, which allows it to maintain good performance after aging and significantly extends the weather life of the PP material.

[0010] The PP material prepared by this invention incorporates a composite reinforcing agent, utilizing the synergistic effect of a bilayer hydroxide and the composite modifier between its layers to improve the weather resistance of the matrix. The layered structure of the bilayer hydroxide itself acts like countless tiny "mirrors," reflecting, scattering, and physically blocking ultraviolet light at multiple levels, directly reducing the total amount of ultraviolet light reaching the interior of the PP material. The interlayer of the LDH contains exchangeable anions, which can act as containers to fix organic functional molecules (such as benzotriazole and hindered amines) within its interlayer. This "host-guest" structure significantly improves the thermal stability of organic light stabilizers, preventing their decomposition due to high temperatures during processing or use. Simultaneously, the "anchoring" effect of the layered structure fixes small-molecule organic functional molecules within the interlayer, effectively solving the problem of traditional organic additives easily migrating and precipitating from the interior of PP, leading to protective failure and surface contamination. The intercalation of stearic acid improves the dispersibility of the bilayer hydroxide in the PP matrix. Better dispersibility means a larger and tighter interface between LDH and PP, which not only facilitates the physical shielding effect of LDH but also creates favorable conditions for the subsequent development of organic functional molecules. The benzotriazole in the composite modifier strongly absorbs ultraviolet light, which is most destructive to PP, and converts the absorbed light energy into harmless heat energy through intramolecular hydrogen bonding, thus preventing ultraviolet light from causing PP molecular chain breakage at the source. The hindered amine structure acts as a free radical "scavenger / scavenger," efficiently capturing even small amounts of free radicals (such as alkyl radicals and peroxide radicals) generated in PP, converting them into stable substances, thereby interrupting the entire photo-oxidative degradation chain reaction. Detailed Implementation

[0011] 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.

[0012] Example 1: The composite reinforcing agent was prepared by the following steps: Step A1: Add 0.02 mol 6-chlorohexanoyl chloride to 50 mL tetrahydrofuran and stir until homogeneous in an ice-water bath, which is recorded as solution 1; add 0.02 mol benzotriazole to 50 mL tetrahydrofuran and stir until homogeneous, then add 0.02 mol triethylamine and mix until homogeneous. Then transfer to a 40℃ oil bath and add dropwise to 50 mL solution 1 using a separatory funnel. The addition is completed in 30 minutes. Then, stir the reaction at a constant temperature for 4 hours, filter, rotary evaporate the filtrate, wash with water, filter again, and dry to obtain chlorobenzotriazole; Step A2: After stirring 0.1 mol of chlorobenzotriazole, 0.1 mol of triethylamine and 150 mL of dichloromethane evenly, slowly add 0.11 mol of 2,2,6,6-tetramethylpiperidineamine dropwise under an ice-water bath. After the addition is complete, heat to 40 °C and reflux for 8 h. Wash with water, separate the liquid and collect the organic phase, and rotary evaporate to obtain the composite modifier. Step A3: Dissolve 0.03 mol magnesium nitrate hexahydrate and 0.01 mol aluminum nitrate nonahydrate in 50 mL of deionized water to remove CO2, and label this as the salt solution; heat 100 mL of deionized water to remove CO2 to 60 °C, and add 0.1 mol sodium hydroxide and 0.01 mol stearic acid while stirring vigorously, label this as the alkaline solution; while stirring rapidly, add 50 mL of the salt solution dropwise to 100 mL of the alkaline solution over 10 min. After the addition is complete, crystallize at room temperature for 30 min, wash 5 times by centrifugation with hot water, and then add 150 mL of 0.133 mol / L sodium stearate solution and stir until homogeneous. Stir vigorously at 95 °C and crystallize for 6 h. After crystallization, wash repeatedly with hot ethanol and centrifuge 5 times, and dry to obtain the modified bilayer hydroxide. Step A4: Disperse 0.5g of modified bilayer hydroxide in a mixture of 80mL ethanol and 20mL deionized water by ultrasonication for 30min, then add 15g of composite modifier, stir and react under nitrogen and 50℃ for 5.5h, centrifuge, wash and freeze dry to obtain composite reinforcing agent.

[0013] Example 2: The composite reinforcing agent was prepared by the following steps: Step A1: Add 0.021 mol 6-chlorohexanoyl chloride to 50 mL tetrahydrofuran and stir until homogeneous in an ice-water bath, which is recorded as solution 1; add 0.02 mol benzotriazole to 50 mL tetrahydrofuran and stir until homogeneous, then add 0.021 mol triethylamine and mix until homogeneous. Then transfer to a 40℃ oil bath and add dropwise to 50 mL solution 1 using a separatory funnel. The addition is completed in 30 minutes. Then, stir the reaction at a constant temperature for 4.5 h, filter, rotary evaporate the filtrate, wash with water, filter again, and dry to obtain chlorobenzotriazole; Step A2: After stirring 0.15 mol of chlorobenzotriazole, 0.15 mol of triethylamine and 150 mL of dichloromethane evenly, slowly add 0.16 mol of 2,2,6,6-tetramethylpiperidineamine dropwise under an ice-water bath. After the addition is complete, heat to 40 °C and reflux for 10 h. Wash with water, separate the liquid and collect the organic phase, and rotary evaporate to obtain the composite modifier. Step A3: Dissolve 0.045 mol magnesium nitrate hexahydrate and 0.015 mol aluminum nitrate nonahydrate in 50 mL of deionized water to remove CO2, and label this as the salt solution; heat 100 mL of deionized water to remove CO2 to 65 °C, and add 0.15 mol sodium hydroxide and 0.015 mol stearic acid while stirring vigorously, label this as the alkaline solution; while stirring rapidly, add 50 mL of the salt solution dropwise to 100 mL of the alkaline solution over 10 min. After the addition is complete, crystallize at room temperature for 30 min, wash 5 times by centrifugation with hot water, and then add 150 mL of 0.133 mol / L sodium stearate solution and stir until homogeneous. Stir vigorously at 95 °C and crystallize for 6 h. After crystallization, wash repeatedly with hot ethanol and centrifuge 5 times, and dry to obtain the modified bilayer hydroxide. Step A4: Disperse 0.5g of modified bilayer hydroxide in a mixture of 80mL ethanol and 20mL deionized water by ultrasonication for 30min, then add 17.5g of composite modifier, stir and react under nitrogen and 50℃ for 6h, centrifuge, wash, and freeze dry to obtain composite reinforcing agent.

[0014] Example 3: The composite reinforcing agent was prepared by the following steps: Step A1: Add 0.022 mol 6-chlorohexanoyl chloride to 50 mL tetrahydrofuran and stir until homogeneous in an ice-water bath, which is recorded as solution 1; add 0.02 mol benzotriazole to 50 mL tetrahydrofuran and stir until homogeneous, then add 0.022 mol triethylamine and mix until homogeneous. Then transfer to a 40℃ oil bath and add dropwise to 50 mL solution 1 using a separatory funnel. The addition is completed in 30 minutes. Then stir the reaction at a constant temperature for 5 hours, filter, rotary evaporate the filtrate, wash with water, filter again, and dry to obtain chlorobenzotriazole; Step A2: After stirring 0.2 mol of chlorobenzotriazole, 0.2 mol of triethylamine and 150 mL of dichloromethane evenly, slowly add 0.24 mol of 2,2,6,6-tetramethylpiperidineamine dropwise under an ice-water bath. After the addition is complete, heat to 40 °C and reflux for 12 h. Wash with water, separate the liquid and collect the organic phase, and rotary evaporate to obtain the composite modifier. Step A3: Dissolve 0.06 mol magnesium nitrate hexahydrate and 0.02 mol aluminum nitrate nonahydrate in 50 mL of deionized water to remove CO2, and label this as the salt solution; heat 100 mL of deionized water to remove CO2 to 70 °C, and add 0.2 mol sodium hydroxide and 0.02 mol stearic acid while stirring vigorously, label this as the alkaline solution; while stirring rapidly, add 50 mL of the salt solution dropwise to 100 mL of the alkaline solution over 10 min. After the addition is complete, crystallize at room temperature for 30 min, wash 5 times by centrifugation with hot water, and then add 150 mL of 0.133 mol / L sodium stearate solution and stir until homogeneous. Stir vigorously at 95 °C and crystallize for 6 h. After crystallization, wash repeatedly with hot ethanol and centrifuge 5 times, and dry to obtain the modified bilayer hydroxide. Step A4: Disperse 0.5g of modified bilayer hydroxide in a mixture of 80mL ethanol and 20mL deionized water by ultrasonication for 30min, then add 20g of composite modifier, stir and react under nitrogen and 50℃ for 6.5h, centrifuge, wash and freeze dry to obtain composite reinforcing agent.

[0015] Example 4: A method for preparing a high weather-resistant PP material includes the following steps: 50 parts PP resin, 8 parts maleic anhydride-grafted POE, 15 parts composite reinforcing agent prepared in Example 1, 1 part coupling agent, 0.1 part lubricant, and 0.1 part antioxidant; Preferably, the coupling agent is a titanate coupling agent NDZ-101; Preferably, the lubricant is ethylene bis-stearamide; Preferably, the antioxidant is a mixture of antioxidant 1010 and antioxidant 168, and the ratio of antioxidant 1010 to antioxidant 168 is 1:3. Weigh the raw materials according to the weight parts, add the composite reinforcing agent and coupling agent prepared in Example 1 to a high-speed mixer, stir at 300 rpm for 5 minutes, then add PP resin, maleic anhydride grafted POE, lubricant and antioxidant, stir at 700 rpm for 5 minutes to form a premix, then put the premix into a twin-screw extruder for melt extrusion and granulation to obtain high weather-resistant PP material.

[0016] Preferably, the temperatures of each section of the twin-screw extruder are: 165°C in zone 1, 180°C in zone 2, 190°C in zone 3, 190°C in zone 4, 180°C in zone 5, and 180°C at the die head.

[0017] Example 5: A method for preparing a high weather-resistant PP material includes the following steps: 55 parts PP resin, 12 parts maleic anhydride-grafted POE, 18 parts composite reinforcing agent prepared in Example 2, 1.5 parts coupling agent, 0.3 parts lubricant, and 0.2 parts antioxidant; Preferably, the coupling agent is a titanate coupling agent NDZ-101; Preferably, the lubricant is ethylene bis-stearamide; Preferably, the antioxidant is a mixture of antioxidant 1010 and antioxidant 168, and the ratio of antioxidant 1010 to antioxidant 168 is 1:3. Weigh the raw materials according to the weight parts, add the composite reinforcing agent and coupling agent prepared in Example 2 into a high-speed mixer, stir at 400 rpm for 6 minutes, then add PP resin, maleic anhydride grafted POE, lubricant and antioxidant, stir at 700 rpm for 8 minutes to form a premix, then put the premix into a twin-screw extruder for melt extrusion and granulation to obtain high weather-resistant PP material.

[0018] Preferably, the temperatures of each section of the twin-screw extruder are: 170°C in zone 1, 185°C in zone 2, 195°C in zone 3, 195°C in zone 4, 185°C in zone 5, and 185°C at the die head.

[0019] Example 6: A method for preparing a high weather-resistant PP material includes the following steps: 60 parts PP resin, 15 parts maleic anhydride-grafted POE, 20 parts composite reinforcing agent prepared in Example 3, 2 parts coupling agent, 0.5 parts lubricant, and 0.3 parts antioxidant. Preferably, the coupling agent is a titanate coupling agent NDZ-101; Preferably, the lubricant is ethylene bis-stearamide; Preferably, the antioxidant is a mixture of antioxidant 1010 and antioxidant 168, and the ratio of antioxidant 1010 to antioxidant 168 is 1:3. Weigh the raw materials according to the weight parts, add the composite reinforcing agent and coupling agent prepared in Example 3 to a high-speed mixer, stir at 500 rpm for 8 minutes, then add PP resin, maleic anhydride grafted POE, lubricant and antioxidant, stir at 800 rpm for 10 minutes to form a premix, then put the premix into a twin-screw extruder for melt extrusion and granulation to obtain high weather-resistant PP material.

[0020] Preferably, the temperatures of each section of the twin-screw extruder are: 175°C in zone 1, 185°C in zone 2, 200°C in zone 3, 200°C in zone 4, 190°C in zone 5, and 190°C at the die head.

[0021] Comparative Example 1: This comparative example is a PP material. The difference between this example and Example 6 is that a double-layer hydroxide is used instead of the composite reinforcing agent prepared in Example 3. All other aspects are the same.

[0022] Comparative Example 2: This comparative example is a PP material. The difference between this example and Example 6 is that a double-layer hydroxide is used instead of the composite reinforcing agent prepared in Example 3, and 0.2 parts of ultraviolet absorber UV-326 are added. All other aspects are the same.

[0023] Comparative Example 3: This comparative example is a PP material. The difference between this example and Example 6 is that a double-layer hydroxide is used instead of the composite reinforcing agent prepared in Example 3, and 0.2 parts of light stabilizer 2,4-dihydroxybenzophenone are added. All other aspects are the same.

[0024] The PP materials prepared in Examples 4-6 and Comparative Examples 1-3 were subjected to weather resistance tests: The PP materials of the examples and comparative examples were made into samples, and the samples were irradiated with a xenon lamp in the laboratory for 1000 hours. The tensile properties and impact resistance were tested before and after irradiation. Tensile properties: Tested according to GB / T 1040.2-2022 "Determination of tensile properties of plastics"; Impact resistance: Tested according to GB / T 1043.1-2008 "Determination of impact properties of simply supported plastic beams"; Surface appearance test: Observe whether the surface of the sample cracks or powders before and after aging.

[0025] The test results are shown in Table 1: Table 1: Performance Test Results

[0026] As can be seen from Table 1, the PP material prepared by the present invention still has excellent tensile strength and notched impact strength after aging, and the surface is free from cracks and powdering.

[0027] The above content is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the inventive concept, they should all fall within the protection scope of the present invention.

Claims

1. A high weather-resistant PP material, characterized in that, The raw materials include the following parts by weight: 50-60 parts PP resin, 8-15 parts maleic anhydride grafted POE, 15-20 parts composite reinforcing agent, 1-2 parts coupling agent, 0.1-0.5 parts lubricant, and 0.1-0.3 parts antioxidant. The composite reinforcing agent is prepared by reacting a modified bilayer hydroxide and a composite modifier under nitrogen atmosphere and at 50°C for 5.5-6.5 hours. The modified bilayer hydroxide is prepared by using magnesium nitrate hexahydrate and aluminum nitrate nonahydrate as salts, sodium hydroxide as alkali, and stearic acid as an intercalating agent. The composite modifier is prepared by reacting chlorobenzotriazole with 2,2,6,6-tetramethylpiperidineamine. The chlorobenzotriazole is prepared by reacting 6-chlorohexanoyl chloride with benzotriazole.

2. The high weather-resistant PP material according to claim 1, characterized in that, The composite reinforcing agent is prepared by the following steps: Step A1: Add 6-chlorohexanoyl chloride to tetrahydrofuran and stir until homogeneous in an ice-water bath, which is recorded as solution 1; add benzotriazole to tetrahydrofuran and stir until homogeneous, then add triethylamine and mix until homogeneous, then transfer to a 40℃ oil bath and add it dropwise to solution 1 using a separatory funnel, completing the addition in 30 minutes, then stir the reaction at a constant temperature for 4-5 hours, filter, rotary evaporate the filtrate, wash with water, filter again, and dry to obtain chlorobenzotriazole; Step A2: After stirring chlorobenzotriazole, triethylamine and dichloromethane evenly, 2,2,6,6-tetramethylpiperidineamine is slowly added dropwise under an ice-water bath. After the addition is completed, the mixture is heated to 40°C and refluxed for 8-12 hours. The mixture is then washed with water, separated, and the organic phase is collected and rotary evaporated to obtain the composite modifier. Step A3: Dissolve magnesium nitrate hexahydrate and aluminum nitrate nonahydrate in deionized water to remove CO2, and label this as the salt solution; heat the deionized water to 60-70℃, and add sodium hydroxide and stearic acid while stirring vigorously, label this as the alkaline solution; add the salt solution dropwise to the alkaline solution while stirring rapidly for 10 minutes; after the addition is complete, crystallize at room temperature for 30 minutes, wash 5 times by centrifugation with hot water, then add 0.133mol / L sodium stearate solution and stir evenly, stir vigorously at 95℃, and crystallize for 6 hours; after crystallization, wash repeatedly with hot ethanol and centrifuge 5 times, and dry to obtain the modified bilayer hydroxide; Step A4: Disperse the modified bilayer hydroxide in a mixture of ethanol and deionized water by ultrasonication for 30 min, then add the composite modifier, stir and react under nitrogen and 50℃ conditions for 5.5-6.5 h, centrifuge, wash, and freeze dry to obtain the composite reinforcing agent.

3. The high weather-resistant PP material according to claim 2, characterized in that, In step A1, the ratio of benzotriazole, tetrahydrofuran, triethylamine, and solution 1 in the chlorobenzotriazole is 0.02 mol: 50 mL: 0.02-0.022 mol: 50 mL.

4. The high weather-resistant PP material according to claim 2, characterized in that, In step A1, the ratio of 6-chlorohexanoyl chloride to tetrahydrofuran in solution 1 is 0.02-0.022 mol: 50 mL.

5. The high weather-resistant PP material according to claim 2, characterized in that, In step A2, the ratio of chlorobenzotriazole, triethylamine, dichloromethane, and 2,2,6,6-tetramethylpiperidine is 0.1-0.2 mol: 0.1-0.2 mol: 150 mL: 0.11-0.24 mol.

6. The high weather-resistant PP material according to claim 2, characterized in that, In step A3, the ratio of magnesium nitrate hexahydrate, aluminum nitrate nonahydrate, and deionized water in the salt solution is 0.03-0.06 mol: 0.01-0.02 mol: 50 mL. In the alkaline solution, the ratio of sodium hydroxide, stearic acid, and deionized water is 0.1-0.2 mol: 0.01-0.02 mol: 100 mL. The ratio of salt solution, alkaline solution, and sodium stearate solution is 50 mL, 100 mL: 150 mL.

7. The high weather-resistant PP material according to claim 2, characterized in that, The ratio of the modified bilayer hydroxide, ethanol, deionized water and composite modifier used in step A4 is 0.5g:80mL:20mL:15-20g.

8. The high weather-resistant PP material according to claim 1, characterized in that, The coupling agent is a titanate coupling agent, the lubricant is ethylene bis-stearamide, and the antioxidant is a mixture of antioxidant 1010 and antioxidant 168, with the ratio of antioxidant 1010 to antioxidant 168 being 1:

3.

9. A method for preparing the high weather-resistant PP material according to any one of claims 1-8, characterized in that, Includes the following steps: Weigh the raw materials according to the weight proportions, add the composite reinforcing agent and coupling agent to a high-speed mixer, and stir at 300-500 rpm for 5-8 minutes. Then add PP resin, maleic anhydride grafted POE, lubricant and antioxidant, and stir at 700-800 rpm for 5-10 minutes to form a premix. Then feed the premix into a twin-screw extruder for melt extrusion and granulation to obtain high weather-resistant PP material.

10. A method for preparing a high weather-resistant PP material according to claim 9, characterized in that, The temperatures of each section of the twin-screw extruder are as follows: Zone 1 165-175℃, Zone 2 180-185℃, Zone 3 190-200℃, Zone 4 190-200℃, Zone 5 180-190℃, and the die head 180-190℃.

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