High-weather-resistance low-odor PP material and preparation method thereof

Abstract

The invention relates to the field of preparation of polypropylene materials, and particularly discloses a high-weather-resistance low-odor PP material and a preparation method thereof. The polypropylene composition comprises the following raw materials in parts by mass: 40-60 parts of homo-polypropylene; 20 to 40 parts of modified polypropylene; 0.5 to 1 part of a compatilizer; 5-8 parts of a toughening agent; 0.2 to 0.5 part of a processing aid; the modified polypropylene comprises modified polypropylene I: PDMS (Polydimethylsiloxane) modified polystyrene grafted polypropylene; and the modified polypropylene II is a triblock polyacrylate grafted polypropylene loaded with antioxidant zeolite-b, talcum powder-b and zeolite. By adding the modified polypropylene, the weather resistance and low odor which are accidentally improved are realized.

Description

Technical Field

[0001] This invention belongs to the field of polypropylene material preparation technology, specifically relating to a high weather-resistant, low-odor PP material and its preparation method. Background Technology

[0002] Polypropylene (PP) is widely used in the daily chemical and automotive industries due to its low cost, low density, excellent mechanical properties, and ease of processing. However, PP has poor weather resistance and is prone to photo-oxidative degradation in harsh outdoor environments or during long-term use, leading to yellowing, brittleness, and decreased mechanical properties. Furthermore, additives (such as plasticizers and lubricants) and residual monomers and oligomers added during PP processing can easily migrate to the material surface or be released into the environment, resulting in a high risk of VOC (volatile organic compound) migration, strong odor, and pollution, affecting its use in enclosed environments such as automotive interiors and baby products. Therefore, low-odor, highly weather-resistant PP materials can broaden its application range and better serve the automotive interior sector.

[0003] In existing technologies, solutions to improve the weather resistance of PP often employ composite weather-resistant systems by adding hindered phenolic antioxidants and benzotriazole UV absorbers. However, these weather-resistant agents are mostly small-molecule compounds with poor compatibility with the PP matrix, and are prone to migration and precipitation during long-term use, reducing weather resistance and exacerbating VOC migration problems. Improvements to reduce VOC migration often involve reducing the amount of additives or using low-volatility additives, but this often comes at the cost of sacrificing the material's weather resistance and processing fluidity. Adding VOC-absorbing fillers is another approach, but uneven dispersion of fillers and interfacial defects can affect the material's mechanical properties. Therefore, it is difficult to achieve a balance between high weather resistance and low odor, failing to meet the stringent standards for high-end automotive interior and interior environmental protection materials. Therefore, developing a PP material that combines high weather resistance and low VOC emissions has become an urgent problem to be solved. Summary of the Invention

[0004] In order to obtain PP materials with both high weather resistance and low VOC emissions, this application provides a high weather resistance and low odor PP material and its preparation method.

[0005] In a first aspect, this application provides a high weather-resistant, low-odor PP material, comprising the following raw materials in parts by weight: homopolymer polypropylene: 40-60 parts; modified polypropylene: 20-40 parts; compatibilizer: 0.5-1 part; toughening agent: 5-8 parts; processing aid: 0.2-0.5 parts; wherein the modified polypropylene comprises modified polypropylene I: PDMS-modified polystyrene-grafted polypropylene; and modified polypropylene II: antioxidant-loaded zeolite-b-talc-b-zeolite triblock polyacrylate-grafted polypropylene. Homopolymer polypropylene provides the material matrix, with low residual monomer content and excellent mechanical properties. The compatibilizer helps improve the compatibility of the components, enhances the interfacial bonding force between components, reduces phase separation, and improves the material's mechanical properties. The toughening agent can reduce the material's toughness and improve its properties. The processing aid improves processing flowability and enhances component miscibility.

[0006] This application utilizes two modified polypropylenes to synergistically enhance the weather resistance and low odor properties of polypropylene materials. Specifically, PDMS-modified polystyrene-grafted polypropylene introduces polydimethylsilane onto the phenolic hydroxyl groups of the benzene ring. The double bonds on the benzene ring can polymerize to form polymer chains. Through the grafting reaction between the active groups at the ends of the polymer chains and polypropylene, the compatibility between the modified polypropylene I and the matrix is ​​improved. Furthermore, the PDMS-modified polystyrene segments can chemically bond with the polypropylene segments, reducing incompatibility and interfacial defects, preventing cracking or crack propagation, and allowing the material to maintain good mechanical properties even after aging. PDMS also possesses excellent hydrophobicity, reducing the diffusion of water and oxygen into the material's interior and delaying oxidative chain reactions. Furthermore, during the molding process, the hydrophobic long chains of PDMS migrate to the material surface or interface, causing PDMS-modified polystyrene-grafted polypropylene to partially accumulate on the material surface, forming a dense hydrophobic network. This enhances the function of blocking oxidation pathways, optimizes the heat and weather resistance of the material surface, and further improves the weather resistance of the material. Moreover, this accumulation phenomenon forms a dense network structure on the material surface, and the PDMS long chains strengthen the molecular chain entanglement, which helps to reduce the escape of VOCs or small molecules and reduce the odor of the material.

[0007] This application also incorporates modified polypropylene II: a triblock polyacrylate grafted with antioxidant zeolite-β-talc-β-zeolite. This structure comprises a triblock acrylate grafted with antioxidant zeolite, talc, and zeolite, exhibiting excellent compatibility with the substrate. The zeolite and talc are grafted onto the molecular chains, thus avoiding interfacial defects with the substrate polypropylene, achieving stable dispersion, and allowing each component to exert its specific function. The antioxidant zeolite enhances the dispersion stability and antioxidant efficiency of the antioxidant. Furthermore, the grafted PDMS long chains, with their migration characteristics, drive the antioxidant zeolite towards the interface. This allows the dense network formed by the antioxidant and PDMS-modified polystyrene grafted polypropylene to fully exert its synergistic effect, improving weather resistance and significantly enhancing the material's weather resistance. Additionally, the antioxidant zeolite also plays an adsorption role within the dense network, increasing the adsorption of VOCs on the material surface. Talc is a reinforcing filler that enhances material rigidity, heat resistance, and optimizes dimensional stability. In this application, talc is grafted onto modified polypropylene, reducing its interfacial compatibility. As a layered structure, it forms a stacked network, constructing a physical barrier to isolate oxygen and moisture, thus improving the material's internal weather resistance. Zeolite, as an adsorbent, is unloaded with oxidants and can more efficiently adsorb VOCs escaping from the material. Due to the triblock structure of the antioxidant-loaded zeolite-b-talc-b-zeolite triblock polyacrylate grafted onto polypropylene, the oxidant-loaded zeolite segments are driven by the long PDMS chains to distribute towards the material surface, also exhibiting some adsorption function. Adsorption is achieved on the material surface, while the sheet-like stacked structure and barrier effect of talc helps to fix the unloaded zeolite segments inside the material, thus achieving effective adsorption both on the surface and inside. Therefore, this application achieves synergistic improvement in weather resistance and low odor by incorporating modified polypropylene I and modified polypropylene II into the polypropylene material, reducing the amount of compatibilizer required.

[0008] In some embodiments, the modified polypropylene is a mixture of modified polypropylene I and modified polypropylene II in a mass ratio of 1:(1-3).

[0009] Preferably, the mass ratio of modified polypropylene I to modified polypropylene II is 1:2.

[0010] To further optimize performance, the inventors adjusted the mass ratio of modified polypropylene I and modified polypropylene II to achieve further performance improvements. Experiments show that a mass ratio of modified polypropylene I to modified polypropylene II of 1:(1-3), and more preferably 1:2, exhibits superior weather resistance and low odor. This is likely because, within this range, the material surface is enriched with a dense yet non-brittle network, and the weather-resistant components dispersed on the surface and inside the material achieve optimized synergy. The dense cross-linked network that prevents small molecules from escaping and the zeolite that absorbs VOCs have the optimal effect on reducing odor.

[0011] In some embodiments, the preparation steps of the modified polypropylene I include: ATRP polymerization of PDMS-modified styrene monomer to obtain bromine-terminated PDMS-modified polystyrene; followed by amination and grafting with maleic anhydride polypropylene to obtain the product.

[0012] Preferably, the PDMS-modified styrene monomer is obtained by a ring-opening reaction of 4-hydroxystyrene and monoepoxide-terminated PDMS.

[0013] Preferably, the single-epoxy-terminated PDMS is a single-terminated epoxy silicone oil.

[0014] This application involves a ring-opening reaction between the epoxy groups of a single-ended epoxy silicone oil and the hydroxyl groups of 4-hydroxystyrene, which grafts PDMS onto the styrene monomer. Then, styrene undergoes ATRP polymerization to form bromine-terminated modified polystyrene. The bromine groups are amination, and the grafting is further achieved by reacting with maleic anhydride polypropylene.

[0015] The polar molecular chains of polystyrene and polysiloxanes have poor compatibility with polypropylene, which is a challenge in modifying the properties of polypropylene materials. In this application, PDMS-modified styrene is obtained by ATRP polymerization, which makes the end groups of styrene polymer active bromine groups. This allows for effective grafting through conventional reactions with maleic anhydride groups without the need for additional polystyrene chain activation reactions, thus reducing process steps.

[0016] In some embodiments, the preparation steps of the modified polypropylene II include: sequentially performing ATRP polymerization on antioxidant-loaded zeolite-modified alkenyl monomers, talc-grafted alkenyl monomers and zeolite-grafted alkenyl monomers to obtain a bromine-terminated triblock copolymer, followed by amination and grafting with maleic anhydride polypropylene to obtain the product.

[0017] Preferably, the preparation method of the zeolite-modified alkenyl monomer with antioxidant loading includes: mixing zeolite and antioxidant to achieve adsorption loading, and then modifying the zeolite with silane coupling agent and then obtaining it by ring-opening grafting with monoepoxy-terminated PDMS.

[0018] Preferably, the alkenyl monomer is used to treat the oxidant-loaded zeolite, talc, and zeolite with acryloyloxysilane.

[0019] By grafting acryloyloxy double bonds onto the surface of zeolite and talc, polymerizable monomers can be obtained. Triblock polymers can be polymerized via ATRP, which can effectively design the target molecular structure. Furthermore, bromine end capping is used to reserve active sites for subsequent grafting with polypropylene.

[0020] In some embodiments, the silane coupling agent treated with antioxidant zeolite is an aminosilane coupling agent or a carbon-carbon double bond silane coupling agent.

[0021] By modifying the monomer with two silane coupling agents, double bond characteristics are imparted to the polymer monomer on the one hand, and reaction sites are reserved for subsequent PDMS segment grafting on the other hand. That is, grafting can be achieved through the reaction of epoxy groups and amino groups in single-ended epoxy silicone oil.

[0022] In some embodiments, the compatibilizer is PP-g-MAH; and / or, the toughening agent is an ethylene-octene copolymer; and / or, the processing aid is a lubricant.

[0023] The modified polypropylene of this application achieves good compatibility with the matrix through a grafting process of talc, zeolite, and polystyrene. Therefore, the amount of compatibilizer used is reduced, and a small amount of PP-g-MAH achieves excellent compatibility.

[0024] Secondly, this application provides a method for preparing a high weather-resistant and low-odor PP material, which involves mixing the components provided in the first aspect, melting, extruding, cooling, drying, and granulating to obtain the product.

[0025] In summary, this application has the following beneficial effects: This application synergistically improves the weather resistance and low odor of polypropylene by simultaneously adding modified polypropylene I: PDMS-modified polystyrene-grafted polypropylene; and modified polypropylene II: antioxidant-supported zeolite-b-talc-b-zeolite triblock polyacrylate-grafted polypropylene. Further performance optimization is achieved by adjusting the ratio of these two modifiers.

[0026] This application uses ATRP technology to prepare modified polymer segments of polypropylene. The resulting polymer has active end groups, which facilitates the modification and grafting of polypropylene.

[0027] This application modifies polystyrene with PDMS and supports zeolite with oxidant to form a dense, hydrophobic, and weather-resistant crosslinking network on the material surface. Based on the structure of the antioxidant-supported zeolite-b-talc-b-zeolite triblock, the distribution of zeolite and talc in the material is controlled to form effective VOC adsorption, prevent migration and precipitation, and achieve low odor. Detailed Implementation

[0028] To further aid in understanding the technical solution of this invention, several specific implementation examples are provided below to describe the technical solution of this invention in more detail. All of these described embodiments are only some embodiments of this invention, and not all of them. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments; and the reaction apparatus, monomer compounds, etc. involved in the following embodiments are all commercially available. It should be understood that the following description is only illustrative of the invention by way of example and is not intended to limit the scope of the invention. The scope of protection of the invention is determined by the appended claims. Furthermore, those skilled in the art will understand that modifications can be made to the technical solutions of the invention without departing from the spirit and purpose of the invention. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the subject matter pertains. Before a detailed description of the invention, the following definitions are provided to better understand it.

[0030] All raw materials not mentioned in this application are commercially available brands or can be obtained through conventional processes. Among them, homopolymer polypropylene: polypropylene HJ4012; compatibilizer: CA100; lubricant: Clariant PP 6102; toughening agent: Dow Chemical POE-8842; single-ended epoxy silicone oil: Hubei Maidehao Biotechnology Co., Ltd., molecular weight 3000; zeolite, particle size 5μm; flaky talc powder 1250 mesh; maleic anhydride grafted polypropylene: Dongguan Shenghao Plastics, model XH3221C2DPAV.

[0031] Preparation Example 1: Modified polypropylene I: Single-ended epoxy silicone oil and 4-hydroxystyrene were vacuum dried to remove water; 10 parts of single-ended epoxy silicone oil were added to 150 parts of toluene, and nitrogen gas was introduced; 0.8 parts of hydroquinone were added at 500 rpm, followed by the addition of 4-hydroxystyrene to make the molar ratio of epoxy groups to phenolic hydroxyl groups in the system 1:1.05, and the temperature was raised to 50℃ and reacted for 10 h; the solvent was removed by vacuum distillation, and impurities were separated by extraction with 150 parts of water, and the oil phase was vacuum dried to obtain PDMS modified styrene monomer; 100 parts of monomer were added to 100 parts of toluene, nitrogen gas was introduced, 1.5 parts of cuprous bromide and 3 parts of PMDETA were added, the mixture was stirred at 500 rpm for 10 min, 0.8 parts of EBiB were added, and the temperature was raised to 65℃ and reacted for 25 h. After the reaction was completed, a large amount of methanol was poured in to precipitate the polystyrene, which was then filtered, washed with methanol, and dried to obtain bromine-terminated polystyrene. 10 parts of bromine-terminated polystyrene were added to 50 parts of anhydrous DMF, heated to 50°C, stirred at 500 rpm for 15 min, nitrogen gas was introduced, 15 parts of ethylenediamine and 1 part of triethylamine were added, the temperature was raised to 70°C and reacted for 26 h, unreacted raw materials were removed by vacuum distillation, impurities were removed by extraction with 50 mL of deionized water, the oil phase was added dropwise to 250 parts of anhydrous ethanol, stirred and precipitated, filtered, washed with ethanol and dried to obtain amino-terminated polystyrene; 10 parts maleic anhydride-grafted polypropylene and 4 parts amino-terminated modified polystyrene were added to 150 parts xylene, heated to 100°C and stirred to dissolve, nitrogen gas was introduced, the temperature was raised to 130°C and reacted at 600 rpm for 10 h, after which a large amount of ethanol was added to precipitate, filtered, washed with ethanol and dried to obtain the product.

[0032] Comparative Preparation Example 1: The difference from Preparation Example 1 is that the styrene monomer was not grafted with single-end epoxy silicone oil. The specific steps are as follows: Add 100 parts styrene to 100 parts toluene, purge with nitrogen, add 1.5 parts cuprous bromide and 3 parts PMDETA, stir at 500 rpm for 10 min, add 0.8 parts EBiB, heat to 65℃ and react for 25 h; after the reaction is complete, pour in a large amount of methanol to precipitate, filter, wash with methanol and dry to obtain bromine-terminated polystyrene. 10 parts of bromine-terminated polystyrene were added to 50 parts of anhydrous DMF, heated to 50°C, stirred at 500 rpm for 15 min, nitrogen gas was introduced, 15 parts of ethylenediamine and 1 part of triethylamine were added, the temperature was raised to 70°C and reacted for 26 h, unreacted raw materials were removed by vacuum distillation, impurities were removed by extraction with 50 mL of deionized water, the oil phase was added dropwise to 250 parts of anhydrous ethanol, stirred and precipitated, filtered, washed with ethanol and dried to obtain amino-terminated polystyrene; 10 parts maleic anhydride-grafted polypropylene and 4 parts amino-terminated polystyrene were added to 150 parts xylene, heated to 100°C and stirred to dissolve, nitrogen gas was introduced, the temperature was raised to 130°C, and the reaction was carried out at 600 rpm for 10 h. After the reaction, a large amount of ethanol was added to precipitate, filtered, washed with ethanol, and dried to obtain the product.

[0033] Preparation Example 2 Modified polypropylene II: Vacuum-dry the zeolite for later use. Add 3 parts of antioxidant 1010 to 50 parts of ethanol and heat to 60°C at 300 rpm. Stir for 5 min. Add 10 parts of zeolite and continue stirring for 8 h. Let stand, remove solvent by vacuum distillation, and vacuum dry to obtain antioxidant-loaded zeolite. Two parts of KH570 and three parts of KH550 were added to 100 parts of an aqueous ethanol solution (ethanol-water volume ratio 1:3) to form a silane solution. One hundred parts of antioxidant-loaded zeolite were added to the silane solution, stirred and heated to 60°C at 200 rpm, and reacted for 6 hours. The mixture was then filtered and dried to obtain silane-modified antioxidant-loaded zeolite. 10 parts of silane-modified supported antioxidant zeolite were added to 50 parts of toluene and stirred at 250 rpm for 10 min. Single-ended epoxy silicone oil was added, nitrogen gas was introduced, and the temperature was raised to 80℃ for 15 h. The mixture was filtered, washed with toluene, and dried to obtain PDMS-grafted supported double-bonded zeolite monomer for later use. The zeolite was vacuum dried for later use. Two parts of KH570 were added to 100 parts of an aqueous ethanol solution (ethanol-water volume ratio 1:3) to form a silane solution. 100 parts of zeolite were added to the silane solution, stirred and heated to 60°C at 200 rpm, and reacted for 6 hours. The mixture was then filtered and dried to obtain the zeolite monomer containing double bonds for later use. Three parts of KH570 were added to 100 parts of an aqueous ethanol solution (ethanol-water volume ratio 1:3) to form a silane solution. 100 parts of talc were added to the silane solution, stirred at 400 rpm and heated to 60°C, and reacted for 6 hours. The mixture was then filtered and dried to obtain talc monomer containing double bonds for later use. 20 parts of PDMS-grafted supported double-bonded zeolite monomer were added to 300 parts of toluene, nitrogen gas was introduced, 3 parts of cuprous bromide and 6 parts of PMDETA were added, the mixture was stirred at 500 rpm for 15 min, 0.8 parts of EBiB were added, and the temperature was raised to 75 °C and reacted for 20 h; then 80 parts of double-bonded talc monomer were added, the temperature was raised to 85 °C and the reaction was continued for 25 h, then 20 parts of double-bonded zeolite monomer were added, the temperature was raised to 90 °C and the reaction was continued for 20 h, the reaction was filtered, washed with ethanol and dried to obtain bromine-terminated triblock copolymer; 10 parts of bromine-terminated triblock copolymer were added to 50 parts of anhydrous DMF, heated to 60°C, stirred at 500 rpm for 5 min, nitrogen gas was introduced, 18 parts of ethylenediamine and 1 part of triethylamine were added, the temperature was raised to 75°C and reacted for 30 h, and after the reaction, the mixture was filtered, washed with ethanol and dried to obtain amino-terminated triblock copolymer. 10 parts of maleic anhydride-grafted polypropylene and 5 parts of amino-terminated triblock copolymer were added to 150 parts of xylene, nitrogen gas was introduced, the temperature was raised to 130℃, and the reaction was carried out at 600 rpm for 15 h. After the reaction, the mixture was filtered, washed with ethanol, and dried to obtain the product.

[0034] Comparative Preparation Example 2: The only difference between this and Preparation Example 2 is that this is a triblock polyacrylate grafted with antioxidant zeolite-b-zeolite-b-talc, i.e., a triblock copolymer with a different structure is prepared by using a different monomer feeding order than Preparation Example 2. 20 parts of PDMS-grafted supported double-bonded zeolite monomer were added to 300 parts of toluene, nitrogen gas was introduced, 3 parts of cuprous bromide and 6 parts of PMDETA were added, the mixture was stirred at 500 rpm for 15 min, 0.8 parts of EBiB were added, and the temperature was raised to 75 °C and reacted for 20 h; then 20 parts of double-bonded zeolite monomer were added, the temperature was raised to 90 °C and reacted for 20 h, then 80 parts of double-bonded talc monomer were added, the temperature was raised to 85 °C and the reaction was continued for 25 h. After the reaction, the mixture was filtered, washed with ethanol, and dried to obtain a bromine-terminated triblock copolymer; the remaining steps were the same as in Preparation Example 2. Example 1

[0035] Raw materials: Homopolymer polypropylene: 50 parts; Modified polypropylene: 30 parts; Compatibilizer: 1 part; Toughening agent: 5 parts; Lubricant: 0.4 parts; Modified polypropylene: The mass ratio of modified polypropylene I of Preparation Example 1 to modified polypropylene II of Preparation Example 2 is 1:2.

[0036] Mix the raw materials according to the proportions of each component; put them into a double vacuum parallel twin-screw extruder for melting and extrusion; the extrusion temperature of all zones is 200℃; after extrusion, cool to room temperature, dry, and then enter a pelletizer for granulation. Example 2

[0037] The difference between Example 2 and Example 1 is that the modified polypropylene is prepared in a mass ratio of 1:0.5 of the modified polypropylene I of Example 1 and the modified polypropylene II of Example 2. Example 3

[0038] The difference between Example 3 and Example 1 is that the modified polypropylene is prepared in a mass ratio of 1:4 for the modified polypropylene I of Example 1 and the modified polypropylene II of Example 2.

[0039] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the modified polypropylene is: the modified polypropylene I of Preparation Example 1.

[0040] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the modified polypropylene is: the modified polypropylene II of Preparation Example 2.

[0041] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that the modified polypropylene is in the mass ratio of modified polypropylene I of Comparative Preparation Example 1 to modified polypropylene II of Preparation Example 2: 1:2.

[0042] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that the modified polypropylene is prepared in a mass ratio of 1:2 for modified polypropylene I of Example 1 and modified polypropylene II of Comparative Example 2.

[0043] Performance testing: Weather resistance test: The products of the examples and comparative examples were made into 170*10*4mm specimens; tensile strength was tested according to ISO 527-2 Tensile properties of plastics and the tensile strength I was recorded; the products of the examples and comparative examples were made into 170*10*4mm specimens and subjected to accelerated ultraviolet aging test for 300h (UVB 313, 0.48W / m) according to ISO 4892-3. 2 (Cyclic irradiation / dark conditions 70℃ 8h / 50℃ 4h, 20 cycles), tensile strength II was tested after aging; tensile strength retention rate was calculated as: tensile strength II / tensile strength I multiplied by 100%; Odor testing: Odor assessment was conducted according to PV3900 standard. TVOC was assessed according to PV3341.

[0044] Performance is shown in Table 1:

[0045] As can be seen from Examples 1-3 and 1-2, this application achieves excellent weather resistance and low odor by using modified polypropylene I and modified polypropylene II together; further performance optimization can be obtained when modified polypropylene I and modified polypropylene II are added to the material at a mass ratio of 1:2; as can be seen from Examples 1 and 3, when PDMS-grafted polystyrene is not used, weather resistance and odor deteriorate, indicating that the dense network enriched on the material surface and the synergistic effect of the loaded antioxidant zeolite are beneficial to improving the weather resistance and odor of the material; as can be seen from Examples 1 and 4... When the modified polypropylene II design molecule is a triblock polyacrylate grafted with antioxidant zeolite-b-zeolite-b-talc, the weather resistance and odor properties are slightly degraded. This may be because the migration of PDMS from the antioxidant zeolite slightly increases the spacing between talc particles, strengthening the barrier effect and further delaying the oxidation path. Talc further optimizes the distribution of zeolite on the material surface and inside, thereby improving the adsorption effect. However, the triblock structure of antioxidant zeolite-b-zeolite-b-talc weakens the above effects, thus resulting in performance degradation.

[0046] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high weathering low odor PP material characterized in that, The each raw material comprises the following mass fractions: homopolymer polypropylene: 40-60 parts; modified polypropylene: 20-40 parts; compatibility agent: 0.5-1 parts; toughening agent: 5-8 parts; processing aid: 0.2-0.5 parts; the modified polypropylene comprises modified polypropylene I: PDMS modified polystyrene grafted polypropylene; and modified polypropylene II: antioxidant-loaded zeolite-b-talc-b-zeolite triblock polyacrylate grafted polypropylene.

2. The highly weatherable low odor PP material of claim 1, wherein, The modified polypropylene is a mixture of modified polypropylene I and modified polypropylene II in a mass ratio of 1:(1-3).

3. The high weathering low odor PP material of claim 1, wherein, The mass ratio of the modified polypropylene I and the modified polypropylene II is 1:

2.

4. The highly weatherable low odor PP material of claim 1, wherein, The preparation steps of the modified polypropylene I comprise: ATRP polymerization of PDMS modified styrene monomer to obtain bromine-terminated PDMS modified polystyrene; then amination, and maleic anhydride polypropylene grafting to obtain the product.

5. The highly weatherable low odor PP material of claim 4, wherein, The PDMS modified styrene monomer is obtained by ring-opening reaction of 4-hydroxystyrene and mono-epoxy-terminated PDMS.

6. The high weathering low odor PP material of claim 1, wherein, The preparation steps of the modified polypropylene II comprise: ATRP polymerization of antioxidant-loaded zeolite modified alkenyl monomer, talc grafted alkenyl monomer, and zeolite grafted alkenyl monomer in sequence to obtain a bromine-terminated triblock copolymer, then amination, and maleic anhydride polypropylene grafting to obtain the product.

7. The highly weatherable low odor PP material of claim 6, wherein, The preparation method of the antioxidant-loaded zeolite modified alkenyl monomer comprises: mixing zeolite and antioxidant to achieve adsorption loading, and then obtaining by ring-opening grafting of single-epoxy-terminated PDMS after modification of the zeolite by a silane coupling agent.

8. The highly weatherable low odor PP material of claim 7, wherein, The silane coupling agent is an amino silane coupling agent or a silane coupling agent containing a carbon-carbon double bond.

9. The highly weatherable low odor PP material of claim 1, wherein, The compatibility agent is PP-g-MAH; and / or, the toughening agent is ethylene-octene copolymer; and / or, the processing aid is a lubricant.

10. A process for the preparation of the high weatherable low odor PP material according to any one of claims 1 to 9, characterized in that, After mixing of the components is completed, the product is obtained by melting, extrusion, cooling, drying, and granulation.

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