A PPR material resistant to migration and UV aging and its preparation method

Abstract

The present invention discloses a PPR material with migration resistance and UV aging resistance, belonging to the field of polymer material preparation. The PPR material comprises the following raw materials for preparation in parts by weight: PPR resin, a composite ultraviolet absorber, a composite free radical scavenger, a carrier, a light shielding agent, a modified rare earth oxide, a nucleating agent, and a dispersant. The composite ultraviolet absorber is obtained by mixing 2-hydroxy-4-acryloyloxy benzophenone and 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, and the composite free radical scavenger is obtained by mixing 2,2,6,6-tetramethyl-4-methacryloyloxypiperidinol and 4-benzoyloxy-2,2,6,6-tetramethylpiperidine. Overall, through the optimization of components and processes, a PPR material with remarkable migration resistance and UV aging resistance can be prepared, and the PPR material has excellent thermal stability and mechanical properties.

Description

Technical Field

[0001] The present invention relates to the field of preparation of polymer materials, and in particular, to a PPR material with migration resistance and UV aging resistance and a preparation method thereof. Background Art

[0002] PPR is the English abbreviation of polypropylene random. Due to its good toughness, high strength, excellent processing performance, and good creep resistance at relatively high temperatures, it is highly favored. PPR pipes are also widely used in many fields such as building water supply and drainage, urban and rural water supply and drainage, urban gas, power and optical cable sheaths, industrial fluid transportation, and agricultural irrigation in construction, municipal, industrial, and agricultural fields.

[0003] Existing research shows that ultraviolet light in the solar spectrum has a strong destructive effect on PPR materials. The wavelength range of sunlight reaching the ground is about 190 - 3000 nm. Among them, the photon energy of the wavelength range of 700 - 300 nm is about 170 - 390 kJ / moL, while the energy required for the C-C single bond to break is only 340 kJ / moL. The UV-B region (295 - 315 nm) and UV-A region (315 - 400 nm) in the solar ultraviolet light range can cause photo-degradation and loss of PPR materials. The light energy in the visible light region of 400 - 760 nm mainly causes thermal-oxidative aging of PPR materials. The chain segments of PPR materials absorb ultraviolet light and break, and the activation energy required is much lower than that required for breaking by absorbing heat. Although the main part of the ultraviolet light that can cause photo-degradation of PPR materials in the sunlight reaching the ground is the ultraviolet light with a wavelength of 290 - 400 nm, in recent years, due to the aggravation of air pollution, the ozone layer hole and thinning have occurred. The ultraviolet light with a wavelength of 190 - 290 nm, which was originally difficult to penetrate the air, can now reach the ground, and the ultraviolet light energy has increased, making the aging effect of sunlight stronger. At the same time, due to the large number of tertiary carbon structures in the molecular chain structure of PPR materials itself, free radicals are formed after absorbing ultraviolet light, causing the polymer chain segments to break and chromophores to be generated, and continue to absorb ultraviolet light, making the photo-degradation process continuous and accelerating. And during the photo-degradation process of PPR materials, oxygen in the air can quickly react with free radicals to form a large number of highly active peroxide free radicals, promoting the free radicals to undergo photo-oxidative dehydrogenation reactions faster, and then causing the molecular chain of PPR materials to break, degrade, crosslink, etc. The photo-aging reaction will also cause the PPR material to fade and turn yellow, affecting the appearance, and cause its molecular weight to decrease or crosslink, making the PPR material hard, brittle, cracked, and its mechanical properties gradually deteriorate, and finally lose its use value. Therefore, in the prior art, the research on the migration resistance and UV aging resistance of PPR materials has also put forward higher and higher requirements.

[0004] For example, the patent with Chinese Patent Application No. CN201310500794.3 discloses a PPR pipe with high anti-aging property and its manufacturing method. By adding zinc powder, a ZnO layer can be formed inside and on the surface of the pipe, significantly improving the anti-aging property of the pipe. However, due to the single composition, it cannot cope with ultraviolet light of more wavelengths, and the anti-aging effect is limited. Another example is the patent with Chinese Patent Application No. CN201811057201.X, which discloses a weather-resistant PPR pipe and its preparation method. By adding lignin to the PPR raw material, the unique hindered phenol structure can effectively capture the free radicals generated in photo-oxidative aging and thermal-oxidative aging, thereby improving the light stability and thermal stability of the PPR pipe. However, the migration resistance effect is not ideal. Therefore, in the prior art, it is still necessary to develop more solutions to improve the migration resistance and UV aging resistance of PPR materials to meet the market demand, which is of great significance. Summary of the Invention

[0005] Based on this, in order to solve the technical problem of poor UV aging resistance of PPR materials in the prior art, the present invention provides a PPR material with migration resistance and UV aging resistance and its preparation method. The specific technical solutions are as follows:

[0006] A PPR material with migration resistance and UV aging resistance, the PPR material comprises the following raw materials in parts by weight: 100 parts of PPR resin, 0.01 part to 0.05 part of a composite ultraviolet absorber, 0.01 part to 0.7 part of a composite free radical scavenger, 1 part to 5 parts of a carrier, 1 part to 5 parts of a light shielding agent, 0.01 part to 0.08 part of a modified rare earth oxide, 0.5 part to 0.9 part of a nucleating agent, and 0.01 part to 0.03 part of a dispersant;

[0007] Among them, the composite ultraviolet absorber is obtained by mixing 2-hydroxy-4-acryloyloxy benzophenone and 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole in a mass ratio of (1 to 5):(1 to 2);

[0008] The composite free radical scavenger is obtained by mixing 2,2,6,6-tetramethyl-4-methacryloyloxy piperidinol and 4-benzoyloxy-2,2,6,6-tetramethylpiperidine in a mass ratio of (1 to 9):(1 to 5).

[0009] Further, the melt index of the PPR resin under the conditions of 230°C and 2.16 kg is (0.25 to 0.35) g / 10 min.

[0010] Further, the light shielding agent is carbon black, and the oil absorption value of the carbon black is (130 to 190) mL / 100 g.

[0011] Further, the modified rare earth oxide is obtained by modifying a rare earth oxide, and the rare earth oxide is at least one of lanthanum oxide and cerium oxide.

[0012] Further, the modification treatment is as follows: adding the rare earth oxide into a silane coupling agent, and performing ball milling treatment for 5 min to 20 min under the condition of 55°C to 75°C.

[0013] Further, the nucleating agent is at least one of sodium bis(4-tert-butyl)phenyl phosphate and 2,2'-methylenebis(4,6-di-tert-butylphenyl) phosphate sodium.

[0014] Further, the carrier is a copolymer of octadecyl vinyl ether and maleic anhydride.

[0015] In addition, the present invention also provides a preparation method of a PPR material, and the preparation method includes the following steps:

[0016] Mixing the composite ultraviolet absorber, the composite radical scavenger, the carrier and the dispersant, and performing stirring treatment for 10 min to 20 min under the condition of 70°C to 90°C to obtain a mixture A;

[0017] Adding the PPR resin, the light shielding agent, the modified rare earth oxide and the nucleating agent into the mixture A, and performing mixing treatment at a rotation speed of 500 r / min to 800 r / min for 5 min to 10 min to obtain a mixture B;

[0018] Adding the mixture B into a twin-screw extruder, and obtaining the PPR material after melting, extrusion, cooling, traction and cutting.

[0019] Further, the temperature of the melting is 220°C to 235°C, and the time is 10 min to 20 min.

[0020] Further, the cooling process adopts a water cooling method, and the cooling rate is 5°C / min to 10°C / min.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] 1. In this application, by compounding 2-hydroxy-4-acryloyloxy benzophenone with active double bonds and 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, ultraviolet light can be efficiently absorbed and converted into heat energy for dissipation, reducing the energy of the PPR material directly receiving ultraviolet radiation. At the same time, the migration resistance effect of the composite ultraviolet absorber in the PPR matrix is significantly improved. In addition, by compounding 2,2,6,6-tetramethyl-4-methacryloyloxy piperidinol with active double bonds and 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, it can efficiently act on the free radicals formed in the PPR matrix and make them more stable. At the same time, the compounding of the composite ultraviolet absorber and the composite free radical scavenger can cope with ultraviolet rays of more different wavelengths, achieving a synergistic effect and significantly reducing the photodegradation of the PPR material.

[0023] 2. In this application, by adding a light shielding agent, the ultraviolet light irradiation of the PPR material is reduced through a physical approach to achieve a certain protective effect. Combining with the composite ultraviolet absorber and the composite free radical scavenger, improvements are made from both chemical and physical aspects, which helps to improve the migration resistance and UV aging resistance performance of the PPR material.

[0024] 3. In this application, by adding modified rare earth oxides, not only is the compatibility in the PPR material high, but also the thermal stability of the PPR material can be improved, and its mechanical properties can be improved.

[0025] 4. In this invention, the copolymer of octadecyl vinyl ether and maleic anhydride is used as a carrier, interacts with the composite ultraviolet absorber and the composite free radical scavenger, and after cross-linking, it is added to the PPR matrix, with higher stability, and can reduce the migration phenomenon under thermal and light actions, exerting a more excellent anti-UV aging effect, thereby improving the service life of the PPR material. Detailed implementation manners

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following further elaborates on the present invention in combination with embodiments. It should be understood that the specific implementation manners described herein are only used to explain the present invention and do not limit the protection scope of the present invention.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific implementation manners and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0028] A PPR material with resistance to migration and UV aging in one embodiment of the present invention, the PPR material comprising the following raw materials in parts by weight for preparation: 100 parts of PPR resin, 0.01 part to 0.05 part of a composite ultraviolet absorber, 0.01 part to 0.7 part of a composite radical scavenger, 1 part to 5 parts of a carrier, 1 part to 5 parts of a light shield, 0.01 part to 0.08 part of a modified rare earth oxide, 0.5 part to 0.9 part of a nucleating agent, and 0.01 part to 0.03 part of a dispersant;

[0029] Among them, the composite ultraviolet absorber is obtained by mixing 2-hydroxy-4-acrylate benzophenone and 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole in a mass ratio of (1 to 5):(1 to 2);

[0030] The composite radical scavenger is obtained by mixing 2,2,6,6-tetramethyl-4-methacrylate piperidinol and 4-benzoyloxy-2,2,6,6-tetramethylpiperidine in a mass ratio of (1 to 9):(1 to 5).

[0031] In one embodiment, the melt index of the PPR resin under the conditions of 230 °C and 2.15 kg is (0.25 to 0.35) g / 10 min.

[0032] In one embodiment, the light shield is carbon black, and the oil absorption value of the carbon black is (130 to 190) mL / 100 g.

[0033] In one embodiment, the modified rare earth oxide is obtained by modifying a rare earth oxide, and the rare earth oxide is at least one of lanthanum oxide and cerium oxide.

[0034] In one embodiment, the modification treatment is: adding the rare earth oxide into a silane coupling agent, and performing ball milling treatment for 5 min to 20 min under the condition of 55 °C to 75 °C.

[0035] In one embodiment, the nucleating agent is at least one of sodium bis(4-tert-butyl) phosphate and sodium 2,2-methylenebis(4,6-di-tert-butylphenyl) phosphate.

[0036] In one embodiment, the carrier is a copolymer of octadecyl vinyl ether and maleic anhydride.

[0037] In one embodiment, the dispersant is at least one of polyethylene wax and ethylene bisstearamide.

[0038] In addition, the present invention also provides a preparation method of a PPR material, the preparation method comprising the following steps:

[0039] After mixing a composite ultraviolet absorber, a composite free radical scavenger, a carrier and a dispersant, stir and process them at 70 °C to 90 °C for 10 min to 20 min to obtain mixture A;

[0040] Add PPR resin, a light shielding agent, a modified rare earth oxide, and a nucleating agent to the mixture A, and mix and process them at a rotation speed of 500 r / min to 800 r / min for 5 min to 10 min to obtain mixture B;

[0041] Add the mixture B into a twin-screw extruder, and after melting, extruding, cooling, drawing, and cutting, obtain a PPR material.

[0042] In one embodiment, the melting temperature is 220 °C to 235 °C, and the time is 10 min to 20 min.

[0043] In one embodiment, the cooling process adopts a water-cooling method, and the cooling rate is 5 °C / min to 10 °C / min.

[0044] Through the optimization of the components and processes in the above solutions, a PPR material with resistance to migration and UV aging can be obtained as a whole.

[0045] Next, the implementation scheme of the present invention will be described in detail with specific embodiments.

[0046] It should be noted that the preparation raw materials in the following examples are in parts by weight.

[0047] Example 1:

[0048] A preparation method of a PPR material, the preparation method includes the following steps:

[0049] Mix 2-hydroxy-4-acryloyloxy benzophenone and 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole with a mass ratio of 3:2 to obtain a composite ultraviolet absorber;

[0050] Mix 2,2,6,6-tetramethyl-4-methacryloyloxypiperidinol and 4-benzoyloxy-2,2,6,6-tetramethylpiperidine with a mass ratio of 5:2 to obtain a composite free radical scavenger;

[0051] Add lanthanum oxide to a silane coupling agent, and under the condition of 65 °C, perform ball milling treatment for 15 min to obtain a modified rare earth oxide;

[0052] Mix 0.05 parts of the composite ultraviolet absorber, 0.5 parts of the composite free radical scavenger, 3 parts of the copolymer of octadecyl vinyl ether and maleic anhydride, and 0.02 parts of polyethylene wax, and stir the mixture at 85 °C for 15 min to obtain mixture A;

[0053] Add 100 parts of PPR resin, 3 parts of carbon black, 0.03 parts of the modified rare earth oxide, and 0.6 parts of bis(4-tert-butyl) sodium phosphate to the mixture A, and mix the materials at a speed of 500 r / min for 7 min to obtain mixture B;

[0054] Add the mixture B to a twin-screw extruder, melt it at 225 °C for 15 min, extrude it, and use water cooling with a cooling rate of 5 °C / min. After traction and cutting, a PPR material is obtained.

[0055] Example 2:

[0056] A preparation method of a PPR material, the preparation method comprising the following steps:

[0057] Mix 2-hydroxy-4-acryloyloxy benzophenone and 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole with a mass ratio of 4:1 to obtain a composite ultraviolet absorber;

[0058] Mix 2,2,6,6-tetramethyl-4-methacryloyloxy piperidinol and 4-benzoyloxy-2,2,6,6-tetramethyl piperidine with a mass ratio of 4:3 to obtain a composite free radical scavenger;

[0059] Add lanthanum oxide to a silane coupling agent, and perform ball milling treatment at 70 °C for 12 min to obtain a modified rare earth oxide;

[0060] Mix 0.04 parts of the composite ultraviolet absorber, 0.6 parts of the composite free radical scavenger, 4 parts of the copolymer of octadecyl vinyl ether and maleic anhydride, and 0.03 parts of polyethylene wax, and stir the mixture at 88 °C for 15 min to obtain mixture A;

[0061] Add 100 parts of PPR resin, 4 parts of carbon black, 0.04 parts of the modified rare earth oxide, and 0.7 parts of bis(4-tert-butyl) sodium phosphate to the mixture A, and mix the materials at a speed of 500 r / min for 10 min to obtain mixture B;

[0062] Add the mixture B to a twin-screw extruder, melt it at 225 °C for 15 min, extrude it, and use water cooling with a cooling rate of 5 °C / min. After traction and cutting, a PPR material is obtained.

[0063] Example 3:

[0064] A preparation method of a PPR material, the preparation method comprising the following steps:

[0065] Mix 2-hydroxy-4-acryloyloxybenzophenone and 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole with a mass ratio of 3:2 to obtain a composite ultraviolet absorber;

[0066] Mix 2,2,6,6-tetramethyl-4-methacryloyloxypiperidinol and 4-benzoyloxy-2,2,6,6-tetramethylpiperidine with a mass ratio of 2:5 to obtain a composite radical scavenger;

[0067] Add lanthanum oxide to a silane coupling agent, and perform ball milling treatment for 10 min at 75 °C to obtain a modified rare earth oxide;

[0068] Mix 0.03 parts of the composite ultraviolet absorber, 0.7 parts of the composite radical scavenger, 5 parts of the copolymer of octadecyl vinyl ether and maleic anhydride, and 0.03 parts of polyethylene wax, and perform stirring treatment for 20 min at 90 °C to obtain mixture A;

[0069] Add 100 parts of PPR resin, 3 parts of carbon black, 0.05 parts of the modified rare earth oxide, and 0.6 parts of bis(4-tert-butyl) sodium phosphate to the mixture A, and perform mixing treatment at a rotation speed of 500 r / min for 10 min to obtain mixture B;

[0070] Add the mixture B to a twin-screw extruder, melt it at 230 °C for 10 min, extrude it, and use water cooling with a cooling rate of 8 °C / min, and then perform traction and cutting to obtain the PPR material.

[0071] Comparative Example 1:

[0072] Compared with Example 3, in Comparative Example 1, a single 2-hydroxy-4-acryloyloxybenzophenone is added as the ultraviolet absorber, and the others are the same as in Example 3.

[0073] Comparative Example 2:

[0074] Compared with Example 3, in Comparative Example 2, a single 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole is added as the ultraviolet absorber, and the others are the same as in Example 3.

[0075] Comparative Example 3:

[0076] Compared with Example 3, in Comparative Example 3, a single 2,2,6,6-tetramethyl-4-methacryloyloxypiperidinol is added as the radical scavenger, and the others are the same as in Example 3.

[0077] Comparative Example 4:

[0078] Compared with Example 3, in Comparative Example 4, a single 4-benzoyloxy-2,2,6,6-tetramethylpiperidine was used as the radical scavenger, and the others were the same as in Example 3.

[0079] Comparative Example 5:

[0080] Compared with Example 3, in Comparative Example 5, the composite ultraviolet absorber and the composite radical scavenger were not pre-mixed with the copolymer of octadecyl vinyl ether and maleic anhydride, and the others were the same as in Example 3. That is, the preparation process in Comparative Example 5 was as follows:

[0081] 0.03 parts of the composite ultraviolet absorber, 0.7 parts of the composite radical scavenger, 0.03 parts of polyethylene wax, 100 parts of PPR resin, 3 parts of carbon black, 0.05 parts of the modified rare earth oxide, and 0.6 parts of sodium bis(4-tert-butyl) phosphate were mixed evenly and then subjected to mixing treatment at a speed of 500 r / min for 10 min to obtain a mixture;

[0082] The mixture was added to a twin-screw extruder and melted at 230 °C for 10 min, extruded, cooled by water cooling at a cooling rate of 8 °C / min, and then drawn and cut to obtain the PPR material.

[0083] Comparative Example 6:

[0084] The difference between Comparative Example 6 and Example 3 was that the composite ultraviolet absorber was not added in Comparative Example 6, and the others were the same as in Example 3.

[0085] Comparative Example 7:

[0086] The difference between Comparative Example 7 and Example 3 was that the composite radical scavenger was not added in Comparative Example 7, and the others were the same as in Example 3.

[0087] Comparative Example 8:

[0088] The difference between Comparative Example 8 and Example 3 was that the modified rare earth oxide was not added in Comparative Example 8, and the others were the same as in Example 3.

[0089] Comparative Example 9:

[0090] Compared with Example 3, in Comparative Example 9, carbon black (light shielding agent) was not added, and the others were the same as in Example 3.

[0091] The PPR material samples prepared in Examples 1 to 3 and the comparative PPR material samples prepared in Comparative Examples 1 to 9 were subjected to performance tests, and the appearance conditions at 85°C and 80% humidity for 1000 h were recorded; the tensile strength retention rate % and flexural modulus retention rate % of the 2000 h ultraviolet aging test (the method refers to GB / T 16422-2014) are shown in Table 1 below.

[0092] Table 1: Performance Results

[0093]

[0094] It can be seen from the data analysis in Table 1 that after the preparation raw materials of the present invention are optimized, the components act synergistically, and can achieve a significant anti-ultraviolet effect. Specifically, the differences between Comparative Examples 1 to 2 and Example 3 lie in the addition of different ultraviolet absorbers, but the yellowing index and anti-ultraviolet effect are significantly worse than those of Example 3, indicating that the addition of the composite ultraviolet absorber in this application can achieve the purpose of synergistic effect; the differences between Comparative Examples 3 to 4 and Example 3 lie in the components of the radical scavenger, but it can also be seen that the yellowing index is relatively high and the anti-ultraviolet effect is poor, indicating that the components of the composite radical scavenger act synergistically and can also improve the anti-ultraviolet effect; the difference between Comparative Example 5 and Example 3 is that the carrier is not added in Comparative Example 5, but there is a slight sticky situation, and the yellowing index is high and the anti-ultraviolet effect is poor, indicating that the carrier can promote the cross-linking of the composite ultraviolet agent and the composite radical scavenger to form a more stable use state; no composite ultraviolet absorber is added in Comparative Example 6, and no composite radical scavenger is added in Comparative Example 7. It can also be seen that their yellowing indices are significantly higher than those of Example 3, and the anti-ultraviolet effects are significantly worse, indicating that there is also an interaction and synergistic effect between the composite ultraviolet absorber and the composite radical scavenger, and the combination of components achieves the effect of 1 + 1 > 2; no modified rare earth oxide is added in Comparative Example 8, and no carbon black is added in Comparative Example 9. Although the anti-ultraviolet effect is superior to that of Comparative Examples 1 to 7, it is worse than that of Example 3, indicating that the addition of modified rare earth oxide and carbon black has a certain influence on the anti-ultraviolet effect. Therefore, as a complete formulation system, through optimizing the components and their ratios, the present application has excellent migration resistance effect, and further enables the active ingredients to long-term exert their anti-ultraviolet performance, and can obtain PPR materials with excellent apparent quality and significant anti-ultraviolet effect.

[0095] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0096] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A migration-resistant and UV-resistant PPR material, characterized in that: The PPR material comprises the following raw materials in parts by weight: 100 parts of PPR resin, 0.01 to 0.05 parts of composite ultraviolet absorber, 0.01 to 0.7 parts of composite free radical scavenger, 1 to 5 parts of carrier, 1 to 5 parts of light shielding agent, 0.01 to 0.08 parts of modified rare earth oxide, 0.5 to 0.9 parts of nucleating agent and 0.01 to 0.03 parts of dispersant; The composite ultraviolet absorber is obtained by mixing 2-hydroxy-4-acrylate benzophenone and 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole in a mass ratio of (1-5): (1-2); The composite free radical scavenger is obtained by mixing 2,2,6,6-tetramethyl-4-methylacrylate piperidinol and 4-benzoyloxy-2,2,6,6-tetramethylpiperidine in a mass ratio of (1-9):(1-5); The carrier is a copolymer of octadecyl vinyl ether and maleic anhydride; The method for preparing the migration-resistant and UV-resistant PPR material comprises the following steps: The composite ultraviolet absorber, the composite free radical scavenger, the carrier and the dispersant are mixed, and stirred at 70°C to 90°C for 10min to 20min to obtain a mixture A; Adding PPR resin, light shielding agent, modified rare earth oxide and nucleating agent into the mixture A, mixing at a speed of 500 r / min to 800 r / min for 5 min to 10 min to obtain a mixture B; The mixture B is added into a twin-screw extruder, and then melted, extruded, cooled, pulled, and cut to obtain a PPR material.

2. The PPR material according to claim 1, characterized in that: The melt index of the PPR resin at 230° C. and 2.16 kg is (0.25-0.35) g / 10 min.

3. The PPR material according to claim 1, characterized in that: The light shielding agent is carbon black, and the oil absorption value of the carbon black is (130-190) mL / 100 g.

4. The PPR material according to claim 1, characterized in that: The modified rare earth oxide is obtained by subjecting rare earth oxide to modification treatment, and the rare earth oxide is at least one of lanthanum oxide and cerium oxide.

5. The PPR material according to claim 4, characterized in that: The modification treatment is as follows: adding rare earth oxide to a silane coupling agent, and subjecting the mixture to ball milling for 5 to 20 minutes at a temperature of 55 to 75°C.

6. The PPR material according to claim 1, characterized in that: The nucleating agent is at least one of bis(4-tert-butyl) sodium phosphate and 2,2-methylene-bis(4,6-di-tert-butylphenyl) sodium phosphate.

7. The migration-resistant and UV-resistant PPR material according to claim 1, characterized in that: The melting temperature is 220° C. to 235° C., and the melting time is 10 min to 20 min.

8. The migration-resistant and UV-resistant PPR material according to claim 1, characterized in that: The cooling process adopts water cooling, and the cooling rate is 5°C / min~10°C / min.

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