A high-temperature resistant PP rod and its preparation method

Abstract

The present invention discloses a high-temperature resistant PP rod and a preparation method thereof, belonging to the technical field of polypropylene materials. Weigh 150 - 200 parts of PP resin, 30 - 45 parts of modified hollow glass microspheres, 2 - 5 parts of lubricant, 0.5 - 1.5 parts of ultraviolet absorber, and 0.01 - 0.1 part of initiator by weight and place them in a high-speed mixer to mix evenly. Then, place them in a twin-screw extruder for melt extrusion, followed by cooling and shaping, and traction cutting to obtain the high-temperature resistant PP rod. The modified hollow glass microspheres of the present invention have good compatibility with raw materials such as PP resin, and there is a chemical interaction with PP resin. Therefore, the modified hollow glass microspheres containing POSS, phosphorus element, hindered phenol structure, and hindered amine structure can be dispersed and stabilized in the PP rod, maximizing their own functions, and effectively improving the high-temperature resistance, flame retardancy, antioxidant performance, and mechanical properties of the PP rod, etc.

Description

Technical Field

[0001] The present invention belongs to the technical field of polypropylene materials, and specifically relates to a high-temperature resistant PP rod and a preparation method thereof. Background Art

[0002] Polypropylene (PP) is a non-toxic, odorless, milky white highly crystalline polymer with a density of only 0.90 - 0.91 g / cm 3 , and it is one of the lightest varieties among all plastics currently. It is particularly stable in water, with a water absorption rate of only 0.01% in water, a molecular weight of about 80,000 - 150,000, and its strength, stiffness, hardness, and heat resistance are all superior to low-pressure polyethylene, and it can be used at about 100°C. Polypropylene resin is one of the most widely used and largest consumption organic synthetic polymer resins, and is widely used in fields such as electrical insulation switches, plastic encapsulation materials, electrical appliance housings, drinking water pipes, cable pipelines, sewage pipelines, etc.

[0003] However, since polypropylene is a hydrocarbon-based polymer material, it is not resistant to high temperatures and is prone to softening and losing its original function when heated. In addition, polypropylene materials are prone to aging under the action of light, heat, and oxygen during use, which not only reduces the aesthetics but also greatly limits its practical application. At the same time, polypropylene is flammable, with an oxygen index of only about 18, and there is a phenomenon of dripping during combustion, which is easy to cause fires and has certain potential safety hazards. Chinese Patent CN1872909A discloses a general high-temperature resistant polypropylene and a preparation method thereof. The components of the high-temperature resistant polypropylene include 67.9 - 85 parts of copolymerized polypropylene, 2 - 10 parts of calcium carbonate, 30 - 40 parts of talc powder, and 0.1 - 1 part of antioxidant by weight. This invention modifies polypropylene with inorganic fillers, improves the heat distortion temperature of the polypropylene material, and overcomes the defect of its easy heat deformation, but the dispersion degree of the inorganic powder is poor, and the high-temperature resistance performance of the polypropylene material still needs to be improved, and at the same time, the flame retardancy and anti-aging properties also need to be improved.

[0004] Therefore, how to improve the high-temperature resistance performance of polypropylene rods and at the same time have high flame retardancy and anti-aging properties has become an urgent problem to be solved in the development of such materials. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a high-temperature resistant PP rod and a preparation method thereof.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A high-temperature resistant PP rod, comprising the following raw materials in parts by weight: 150 - 200 parts of PP resin, 30 - 45 parts of modified hollow glass microspheres, 2 - 5 parts of lubricant, 0.5 - 1.5 parts of ultraviolet absorber, and 0.01 - 0.1 part of initiator.

[0008] Further, the modified hollow glass microspheres are prepared through the following steps:

[0009] S1. Add 3,5 - di - tert - butyl - 4 - hydroxycinnamic acid, pentaerythritol phosphate ester, and 1,4 - dioxane into a thoroughly dried three - necked flask. After stirring evenly, slowly add concentrated sulfuric acid. After the addition, slowly raise the temperature to 110 °C and keep the reaction for 5 h. After the reaction ends, first cool to room temperature, then add deionized water. After oscillation, let it stand for liquid - liquid separation until the pH of the aqueous phase is neutral. Take the organic phase, first dry it with anhydrous magnesium sulfate, then filter it. Distill the filtrate under reduced pressure and purify it by column chromatography (the eluent is a mixed solvent of cyclohexane and ethyl acetate, and the volume ratio of cyclohexane to ethyl acetate is 1:1). Finally, distill it under reduced pressure again to obtain intermediate 1. The dosage ratio of 3,5 - di - tert - butyl - 4 - hydroxycinnamic acid, pentaerythritol phosphate ester, concentrated sulfuric acid, and 1,4 - dioxane is 28 g:23 g:0.2 mL:240 mL;

[0010] Under the heating condition and the catalytic condition of concentrated sulfuric acid, control the molar ratio of 3,5 - di - tert - butyl - 4 - hydroxycinnamic acid to pentaerythritol phosphate ester to be 1:1.2 - 1.3, then 3,5 - di - tert - butyl - 4 - hydroxycinnamic acid and pentaerythritol phosphate ester undergo an esterification reaction, and the reaction process is as follows:

[0011]

[0012] S2. Add intermediate 1, 2,2,6,6 - tetramethyl - 4 - piperidinol, DBU (1,8 - diazabicyclo[5.4.0]undec - 7 - ene), and 1,4 - dioxane into a thoroughly dried three - necked flask. After stirring evenly, raise the temperature to 60 °C and react for 48 h. After the reaction ends, first cool to room temperature, then distill it under reduced pressure and purify it by column chromatography (the eluent is a mixed solvent of chloroform and ether, and the volume ratio of chloroform to ether is 8:2). Finally, distill it under reduced pressure again to obtain intermediate 2. The dosage ratio of intermediate 1, 2,2,6,6 - tetramethyl - 4 - piperidinol, DBU, and 1,4 - dioxane is 39 g:16.4 g:0.4 mL:240 mL;

[0013] Under the catalytic action of DBU, control the molar ratio of intermediate 1 to 2,2,6,6 - tetramethyl - 4 - piperidinol to be 1:1.1 - 1.2, then intermediate 1 and 2,2,6,6 - tetramethyl - 4 - piperidinol undergo a Michael addition reaction, and the reaction process is as follows:

[0014]

[0015] S3. Flush the dry three-necked flask with nitrogen for 30 min to expel the air and moisture in the flask, then add octavinyl-POSS, 3-mercaptopropyltriethoxysilane, 2-tert-butylanthraquinone and dimethyl sulfoxide. After mixing evenly and stirring to dissolve, irradiate it under a 365 nm ultraviolet lamp for 0.5 h under nitrogen protection. After the irradiation, perform vacuum distillation to obtain intermediate 3; the dosage ratio of octavinyl-POSS, 3-mercaptopropyltriethoxysilane, 2-tert-butylanthraquinone and dimethyl sulfoxide is 50 g: 21 mL: 0.06 g: 200 mL;

[0016] Under the action of ultraviolet lamp irradiation and the photoinitiator 2-tert-butylanthraquinone, control the molar ratio of octavinyl-POSS and 3-mercaptopropyltriethoxysilane to be 1: 1.05 - 1.15, then octavinyl-POSS and 3-mercaptopropyltriethoxysilane undergo a thiol-ene click reaction, and the reaction process is as follows:

[0017]

[0018] S4. Flush the dry three-necked flask with nitrogen for 30 min to expel the air and moisture in the flask, then add intermediate 2, intermediate 3, titanium tetraisopropoxide and dimethyl sulfoxide. After stirring evenly, heat up to 90 °C and keep the temperature for reaction for 26 h. After the reaction, cool to room temperature, perform vacuum distillation, and purify by column chromatography (select a mixed solvent of benzene and methanol as the eluent, and the volume ratio of benzene to methanol is 9:1). Finally, perform vacuum distillation to remove the eluent to obtain intermediate 4; the dosage ratio of intermediate 2, intermediate 3, titanium tetraisopropoxide and dimethyl sulfoxide is 30 g: 47 g: 0.5 mL: 250 mL;

[0019] Control the molar ratio of intermediate 2 and intermediate 3 to be 1: 1.05 - 1.1. Intermediate 2 and intermediate 3 undergo the following chemical reaction under the catalytic action of titanium tetraisopropoxide, and the reaction process is as follows:

[0020]

[0021] S5. Add hollow glass microspheres and absolute ethanol to the three-necked flask. After stirring evenly, add acetic acid to adjust the pH to 4. Under nitrogen protection, disperse intermediate 4 in DMF (N,N-dimethylformamide). After stirring to dissolve, transfer it to the above three-necked flask. After the transfer, stir and heat up to 65 °C and keep the temperature for reaction for 1 h. After the reaction, cool to room temperature, centrifuge, take the precipitate, ultrasonically disperse it in DMF, and finally dry it at 110 °C for 12 h to obtain modified hollow glass microspheres. The mass ratio of hollow glass microspheres to intermediate 4 is 4:1.

[0022] The main component of hollow glass microspheres is borosilicate, and its surface is rich in silanol groups. While intermediate 4 has silaneoxy groups on its surface. Under acidic conditions, the silaneoxy groups will hydrolyze to form silanol groups, which can form chemical bonds with the hydroxyl groups on the surface of hollow glass microspheres, thus preparing modified hollow glass microspheres.

[0023] The modified hollow glass microspheres contain cage-like polyhedral oligomeric silsesquioxane (POSS). The POSS framework has a regular cage structure with a silicon-oxygen framework structure, which has certain rigidity, relatively high thermal stability and mechanical properties. When heated, it will form a more dense and stable protective layer containing Si-O bonds and Si-C bonds than the conventional carbon layer, isolating the heat transfer and the escape of combustibles generated by the decomposition of polymer materials. At the same time, it blocks the supply of oxygen, enhancing the flame retardancy, heat resistance and mechanical properties of polymer materials. At the same time, the modified glass microspheres also contain the halogen-free flame retardant element phosphorus. The phosphorus-containing flame retardant coexists and interacts with the gas-phase and condensed-phase flame retardant mechanisms, thus exerting the flame retardant effect. Therefore, adding the modified hollow glass microspheres containing POSS and phosphorus can effectively improve the flame retardancy, heat resistance and mechanical properties of PP rods.

[0024] In addition, the modified hollow glass microspheres also contain hindered phenols and hindered amines. Among them, the hindered phenols can provide active hydrogen atoms to capture peroxy radicals, enhancing the antioxidant performance of the modified hollow glass microspheres. Hindered amines are a class of organic amine compounds with steric hindrance, which have a good inhibitory effect on the photo-oxidative degradation reaction of polymer materials. Acting synergistically with ultraviolet absorbers can effectively protect PP rods from ultraviolet damage. Therefore, adding the modified hollow glass microspheres containing hindered phenols and hindered amines can effectively improve the antioxidant performance and ultraviolet resistance of PP rods.

[0025] The main component of the hollow glass microspheres in the modified hollow glass microspheres is borosilicate, which has the advantages of light weight, low thermal conductivity, high strength and good chemical stability. The modified hollow glass microspheres prepared by the present invention have lipophilic ester groups, heterocycles, benzene rings, etc. on their surfaces, which makes the modified hollow glass microspheres very easy to disperse in organic materials such as PP resin. In addition, the surface of the modified hollow glass microspheres contains abundant terminal carbon-carbon double bonds, which can chemically react with the unreacted carbon-carbon double bonds at the end of the PP resin under the action of an initiator. Furthermore, the modified hollow glass microspheres can be further dispersed and stabilized in the PP resin, thus effectively improving the high-temperature resistance, flame retardancy, antioxidant performance and mechanical properties of PP rods.

[0026] Furthermore, the lubricant is one or more of calcium stearate, magnesium stearate, zinc stearate, and polyethylene wax.

[0027] Further, the ultraviolet absorber is one or more of ultraviolet absorber UV-P, ultraviolet absorber UV-531, ultraviolet absorber UVP-327, and ultraviolet absorber UV-9.

[0028] Further, the initiator is one or more of dicumyl peroxide, azobisisobutyronitrile, and 2,3-dimethyl-2,3-diphenylbutane.

[0029] A preparation method of a high-temperature resistant PP rod comprises the following steps:

[0030] Weigh each raw material by weight parts and place them in a high-speed mixer to mix evenly. Then, place them in a twin-screw extruder for melt extrusion, followed by cooling and shaping, and traction cutting to obtain the high-temperature resistant PP rod.

[0031] The beneficial effects of the present invention: The modified hollow glass microspheres of the present invention have good compatibility with raw materials such as PP resin, and there is a chemical interaction with PP resin. Therefore, the modified hollow glass microspheres containing POSS, phosphorus element, hindered phenol structure, and hindered amine structure can be dispersed and stabilized in the PP rod, maximizing their own functions, and effectively improving the high-temperature resistance, flame retardancy, antioxidant performance, and mechanical properties of the PP rod, etc. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0033] Example 1, preparing modified hollow glass microspheres, the specific steps are as follows:

[0034] S1. Add 28 g of 3,5-di-tert-butyl-4-hydroxycinnamic acid, 23 g of pentaerythritol phosphate, and 240 mL of 1,4-dioxane into a 500 mL fully dried three-necked flask. After stirring evenly, slowly add 0.2 mL of concentrated sulfuric acid. After adding, slowly raise the temperature to 110 °C and keep the temperature for 5 h. After the reaction is completed, first cool to room temperature, then add deionized water, shake and let it stand for layering until the pH of the aqueous phase is neutral. Take the organic phase, first dry it with anhydrous magnesium sulfate, then filter it. Distill the filtrate under reduced pressure and purify it by column chromatography (the eluent is a mixed solvent of cyclohexane and ethyl acetate, and the volume ratio of cyclohexane to ethyl acetate is 1:1). Finally, distill it under reduced pressure to obtain intermediate 1;

[0035] S2. Add 39 g of Intermediate 1, 16.4 g of 2,2,6,6 - tetramethyl - 4 - piperidinol, 0.4 mL of DBU, and 240 mL of 1,4 - dioxane into a 500 - mL fully dried three - necked flask. After stirring evenly, heat up to 60 °C and react for 48 h. After the reaction is completed, first cool to room temperature, then perform vacuum distillation, and purify by column chromatography (select a mixed solvent of chloroform and ether as the eluent, and the volume ratio of chloroform to ether is 8:2). Finally, perform vacuum distillation again to obtain Intermediate 2;

[0036] S3. Bubble nitrogen through a 500 - mL dried three - necked flask for 30 min to expel the air and moisture in the flask. Then add 50 g of octavinyl - POSS, 21 mL of 3 - mercaptopropyltriethoxysilane, 0.06 g of 2 - tert - butylanthraquinone, and 200 mL of dimethyl sulfoxide. After mixing evenly and stirring to dissolve, irradiate under a 365 - nm ultraviolet lamp for 0.5 h under nitrogen protection. After the irradiation is completed, perform vacuum distillation to obtain Intermediate 3;

[0037] S4. Bubble nitrogen through a 500 - mL dried three - necked flask for 30 min to expel the air and moisture in the flask. Then add 30 g of Intermediate 2, 47 g of Intermediate 3, 0.5 mL of tetra - isopropyl titanate, and 250 mL of dimethyl sulfoxide. After stirring evenly, heat up to 90 °C and keep the temperature for reaction for 26 h. After the reaction is completed, cool to room temperature, perform vacuum distillation, and purify by column chromatography (select a mixed solvent of benzene and methanol as the eluent, and the volume ratio of benzene to methanol is 9:1). Finally, perform vacuum distillation to remove the eluent to obtain Intermediate 4;

[0038] S5. Add 28 g of hollow glass microspheres and 250 mL of absolute ethanol into a 500 - mL three - necked flask. After stirring evenly, add acetic acid to adjust the pH to 4. Under nitrogen protection, disperse 7 g of Intermediate 4 in 25 mL of DMF, stir to dissolve and then transfer it into the above - mentioned three - necked flask. After the transfer is completed, stir and heat up to 65 °C, keep the temperature for reaction for 1 h. After the reaction is completed, cool to room temperature, centrifuge, take the precipitate, ultrasonically disperse it in DMF, and finally dry it at 110 °C for 12 h to obtain modified hollow glass microspheres.

[0039] Example 2. To prepare a PP rod, the specific steps are as follows:

[0040] Weigh 150 parts of PP resin, 30 parts of the modified hollow glass microspheres prepared in Example 1, 2 parts of calcium stearate, 0.5 part of ultraviolet absorber UV - P, and 0.01 part of azobisisobutyronitrile by weight and place them in a high - speed mixer to mix evenly. Then place them in a twin - screw extruder for melt extrusion, and then cool, shape, and cut by traction to obtain a PP rod.

[0041] Example 3. To prepare a PP rod, the specific steps are as follows:

[0042] Weigh 180 parts by weight of PP resin, 40 parts of the modified hollow glass microspheres prepared in Example 1, 2 parts of calcium stearate, 1 part of magnesium stearate, 0.5 part of ultraviolet absorber UV-531, 0.5 part of ultraviolet absorber UVP-327, and 0.05 part of 2,3-dimethyl-2,3-diphenylbutane, and place them in a high-speed mixer to mix evenly. Then, place them in a twin-screw extruder for melt extrusion, followed by cooling and shaping, and traction cutting to obtain a PP rod.

[0043] Example 4. To prepare a PP rod, the specific steps are as follows:

[0044] Weigh 200 parts by weight of PP resin, 45 parts of the modified hollow glass microspheres prepared in Example 1, 3 parts of zinc stearate, 2 parts of polyethylene wax, 1 part of ultraviolet absorber UVP-327, 0.5 part of ultraviolet absorber UV-9, and 0.1 part of dicumyl peroxide, and place them in a high-speed mixer to mix evenly. Then, place them in a twin-screw extruder for melt extrusion, followed by cooling and shaping, and traction cutting to obtain a PP rod.

[0045] Comparative Example 1. To prepare a PP rod, the specific steps are as follows:

[0046] Keep the remaining steps unchanged, and only replace the modified hollow glass microspheres in Example 2 with untreated hollow glass microspheres to prepare a PP rod.

[0047] Comparative Example 2. To prepare a PP rod, the specific steps are as follows:

[0048] Keep the remaining steps unchanged, and only replace the modified hollow glass microspheres in Example 2 with 24 parts of untreated hollow glass microspheres, 2 parts of flame retardant poly(silsesquioxane), 2 parts of flame retardant FRC-2, 1 part of antioxidant 1010, and 1 part of light stabilizer 622 to prepare a PP rod.

[0049] Comparative Example 3. To prepare a PP rod, the specific steps are as follows:

[0050] Keep the remaining steps unchanged, and only remove the modified hollow glass microspheres in Example 2 to prepare a PP rod.

[0051] Make specimens from the PP rods prepared in Examples 2-4 and Comparative Examples 1-3 according to the corresponding standards, and conduct the following performance tests:

[0052] Tensile strength test: The tensile strength test standard is in accordance with GB / T 1040.1-2018;

[0053] Anti-aging performance test: After the PP rods prepared in Examples 2-4 and Comparative Examples 1-3 were made into standard specimens, they were respectively placed in a dry heat and ultraviolet aging chamber for 120 h, and the tensile strength retention rate of the specimens before and after aging was measured (the tensile strength test standard was in accordance with GB / T 1040.1-2018, and the tensile strength retention rate = (tensile strength after aging / initial tensile strength) × 100%). The test conditions were as follows: dry heat aging at 105 °C for 120 h; ultraviolet aging under a 30 W ultraviolet lamp for 120 h at room temperature with a vertical irradiation distance of 20 cm;

[0054] Heat resistance test: According to the standard GB / T 1634, the heat distortion temperature of the material was tested. The specimen size was 80×10×4 mm, the specimen was placed flat, and the load was 0.45 MPa;

[0055] Flame retardancy test: According to the standard GB / T 2406.2-2009, the oxygen index of the material was tested;

[0056] The test results of all items are shown in the following table:

[0057]

[0058] In the description of the specification, the description of reference terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0059] The above content is only an example and illustration of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined by the claims of this patent, they should all fall within the protection scope of the present invention.

Claims

1. A high-temperature resistant PP rod, characterized in that, It includes the following raw materials in parts by weight: 150 - 200 parts of PP resin, 30 - 45 parts of modified hollow glass microspheres, 2 - 5 parts of lubricant, 0.5 - 1.5 parts of ultraviolet absorber, and 0.01 - 0.1 part of initiator; Among them, the modified hollow glass microspheres are prepared through the following steps: S1. Add 3,5 - di - tert - butyl - 4 - hydroxycinnamic acid, pentaerythritol phosphate ester, and 1,4 - dioxane into a flask. After stirring, add concentrated sulfuric acid, heat up to 110 °C and react for 5 h. Cool to room temperature, add deionized water, let it stand for layering until the pH of the aqueous phase is neutral. Take the organic phase, dry it, filter it, distill the filtrate under reduced pressure, purify it by column chromatography, and distill it under reduced pressure to obtain intermediate 1; S2. Add intermediate 1, 2,2,6,6 - tetramethyl - 4 - piperidinol, DBU, and 1,4 - dioxane into a flask. After stirring, heat up to 60 °C and react for 48 h. Cool to room temperature, distill it under reduced pressure, purify it by column chromatography, and distill it under reduced pressure to obtain intermediate 2; S3. Bubble nitrogen into the flask, add octavinyl - POSS, 3 - mercaptopropyltriethoxysilane, 2 - tert - butylanthraquinone, and dimethyl sulfoxide, stir, and irradiate it under a 365 nm ultraviolet lamp for 0.5 h under nitrogen protection. Distill it under reduced pressure to obtain intermediate 3; S4. Bubble nitrogen into the flask, add intermediate 2, intermediate 3, tetra - isopropyl titanate, and dimethyl sulfoxide, stir, heat up to 90 °C and react for 26 h. Cool to room temperature, distill it under reduced pressure, purify it by column chromatography, and distill it under reduced pressure to obtain intermediate 4; S5. Add hollow glass microspheres and absolute ethanol into a flask. After stirring, add acetic acid to adjust the pH to 4. Under nitrogen protection, disperse intermediate 4 in DMF, stir, then transfer it into the above - mentioned flask, heat up to 65 °C and react for 1 h. Cool to room temperature, centrifuge, take the precipitate, ultrasonically disperse it in DMF, and dry it at 110 °C for 12 h to obtain modified hollow glass microspheres.

2. A high-temperature resistant PP rod according to claim 1, characterized in that, The dosage ratio of 3,5 - di - tert - butyl - 4 - hydroxycinnamic acid, pentaerythritol phosphate ester, concentrated sulfuric acid, and 1,4 - dioxane in step S1 is 28 g:23 g:0.2 mL:240 mL.

3. A high-temperature resistant PP rod according to claim 1, characterized in that, The dosage ratio of intermediate 1, 2,2,6,6 - tetramethyl - 4 - piperidinol, DBU, and 1,4 - dioxane in step S2 is 39 g:16.4 g:0.4 mL:240 mL.

4. A high-temperature resistant PP rod according to claim 1, characterized in that, The dosage ratio of octavinyl - POSS, 3 - mercaptopropyltriethoxysilane, 2 - tert - butylanthraquinone, and dimethyl sulfoxide in step S3 is 50 g:21 mL:0.06 g:200 mL.

5. A high-temperature resistant PP rod according to claim 1, wherein, The dosage ratio of intermediate 2, intermediate 3, tetra - isopropyl titanate, and dimethyl sulfoxide in step S4 is 30 g:47 g:0.5 mL:250 mL.

6. A high-temperature resistant PP rod according to claim 1, characterized in that, The mass ratio of hollow glass microspheres and intermediate 4 in step S5 is 4:

1.

7. A high-temperature resistant PP rod according to claim 1, characterized in that, The lubricant is one or more of calcium stearate, magnesium stearate, zinc stearate, and polyethylene wax.

8. A high-temperature resistant PP rod according to claim 1, characterized in that, The ultraviolet absorber is one or more of ultraviolet absorber UV - P, ultraviolet absorber UV - 531, ultraviolet absorber UVP - 327, and ultraviolet absorber UV - 9.

9. A high-temperature resistant PP rod according to claim 1, characterized in that, The initiator is one or more of dicumyl peroxide, azobisisobutyronitrile, and 2,3-dimethyl-2,3-diphenylbutane.

10. A preparation method of a high-temperature resistant PP rod, which is applied to the high-temperature resistant PP rod described in any one of claims 1-9, and is characterized in that, It includes the following steps: Weigh each raw material by weight parts, place them in a high-speed mixer and mix evenly, then place them in a twin-screw extruder for melt extrusion, and then cool and shape, draw and cut to obtain the high-temperature resistant PP rod.

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