A polypropylene material containing recycled materials and aging resistance, as well as its preparation method and application

Abstract

The present invention provides a recycled and age-resistant polypropylene material, its preparation method, and its application, relating to the field of polymer materials technology. The polypropylene material comprises the following raw materials: recycled polypropylene material, a composite flame retardant, a high-temperature resistant colorant, a compatibilizer, and an antioxidant; the composite flame retardant comprises aluminum hydroxide, styrene-methyl methacrylate block copolymer, and SiC. By combining these components in a specific ratio, the present invention significantly improves the weather resistance, high-temperature resistance, and flame retardancy of the prepared polypropylene material while maintaining its mechanical properties. The polypropylene material can be widely used in automotive interiors, electric vehicle accessories, and other applications.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to an aging-resistant polypropylene material containing recycled materials, a preparation method thereof, and an application thereof. Background Art

[0002] Polypropylene (PP), one of the five most common resins, boasts excellent properties such as lightweight, easy processing, and chemical resistance, making it widely used in the chemical, electrical, packaging, automotive, and construction industries. However, with the increasing use of plastics, discarded PP plastics have caused serious environmental pollution and economic waste. Therefore, the rational use of recycled PP can effectively reduce the environmental harm caused by plastic waste and protect the ecological environment. Furthermore, the use of recycled PP shredded material can conserve resources, reduce the demand for new raw materials, and promote resource reuse, thereby achieving effective resource management and environmental protection.

[0003] Polypropylene is widely used in construction, automotive, electrical appliances, and other fields. Due to these applications, high requirements are placed on its weather resistance, high temperature resistance, and flame retardancy. For example, building pipes and automotive exterior parts are exposed to ultraviolet rays and fluctuating temperature and humidity for long periods of time. The material needs to resist aging to avoid embrittlement, discoloration, or performance degradation, thus requiring high weather resistance and resistance to discoloration. Automobile engine compartments and electronic and electrical components must withstand continuous high temperatures of 100-120°C to avoid deformation or failure, thus requiring excellent high-temperature resistance. Electronics, electrical, automotive interiors, and other fields must comply with flame retardant standards (such as UL94) to reduce fire risks, thus requiring good flame retardancy.

[0004] Most of the recycled waste polypropylene comes from waste plastics. After use, plastics will inevitably age to a certain extent and their molecular weight will decrease. At the same time, due to the migration of processing aids or additives, the mechanical properties and other properties of the waste plastics will deteriorate. Therefore, more attention needs to be paid to improving and maintaining the performance of recycled polypropylene.

[0005] In the prior art, the modification of polypropylene materials is mostly achieved through copolymerization and blending modification, adding functional preparations or high crystallinity design. For example, Chinese patent CN118185178A discloses a scheme for preparing weather-resistant modified materials from recycled polypropylene, which relates to the technical field of weather-resistant modified material preparation. The raw materials for preparation include the following components in parts by weight: 80-95 parts of recycled polypropylene battery shell materials, 0.1-0.5 parts of antioxidants, 0.1-0.3 parts of lubricants, 0.2-0.5 parts of light stabilizers, 5-15 parts of POE, 0.1-0.5 parts of deodorizers, and 5-10 parts of LLDPE. This invention increases the weather resistance of the material by adding some LLDPE to traditional weather-resistant additives and melt-blending with rPP, while maintaining the high strength and hardness of the material itself. Chinese patent application CN 117946477A discloses a modified material for producing polypropylene sheets and its preparation method. The modified material for producing polypropylene sheets is made from the following components by weight: 10-20 parts base polypropylene, 30-50 parts recycled polypropylene, 10-15 parts cis-4-heptenal grafted polypropylene, 100-120 parts inorganic filler, 1-2 parts modified titanate coupling agent, 0.2-1 part aluminate coupling agent, 5-10 parts polyethylene wax, 1-2 parts light stabilizer, and 0.1-0.5 parts antioxidant. Polypropylene sheets produced using this modified material exhibit high impact strength, high flexural modulus, and high-temperature resistance. "Weather Resistance and Flame Retardancy of Recycled Polypropylene-Based Composites" (You Yilan et al., Journal of Packaging, Vol. 16, No. 3, 2024) reported the preparation of a tea-plastic composite using RPP and tea powder. Nano-TiO2 was added to improve the mechanical properties and weather resistance of the composite, and synergistically with APP to enhance its flame retardancy. However, the above existing technologies either focus on improving weather resistance or high temperature resistance, or only modify both weather resistance and flame retardancy, without any research on improving the weather resistance, high temperature resistance and flame retardancy of recycled polypropylene materials at the same time.

[0006] Based on this, developing a recycled polypropylene material while improving its weather resistance, high temperature resistance and flame retardancy, and reducing restrictions on its application scenarios is the research focus of researchers in this field. Summary of the Invention

[0007] To address these issues, the present invention provides an aging-resistant polypropylene material containing recycled materials. By combining the components in a specific ratio, the resulting polypropylene material exhibits significantly improved weather resistance, high-temperature resistance, and flame retardancy, while maintaining its mechanical properties. This polypropylene material can be widely used in automotive interiors, electric vehicle accessories, and other applications.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] In a first aspect, the present invention provides a polypropylene material containing recycled materials and aging resistance, comprising the following raw materials: recycled polypropylene material, a composite flame retardant, a high-temperature resistant color powder, a compatibilizer and an antioxidant; wherein the composite flame retardant comprises aluminum hydroxide (ATH), styrene-methyl methacrylate block copolymer and SiC.

[0010] Preferably, the polypropylene material comprises the following components in parts by mass: 60-100 parts of recycled polypropylene material, 0.1-5 parts of composite flame retardant, 0.001-0.1 parts of high temperature resistant color powder, 0.1-3 parts of compatibilizer and 0.01-1 parts of antioxidant.

[0011] Further preferably, the polypropylene material comprises the following components, calculated by weight: 70-90 parts of recycled polypropylene material, 0.1-3 parts of composite flame retardant, 0.01-0.05 parts of high temperature resistant color powder, 0.1-2 parts of compatibilizer and 0.1-0.5 parts of antioxidant.

[0012] More preferably, the polypropylene material comprises the following components, calculated by weight: 75-85 parts of recycled polypropylene material, 0.1-2 parts of composite flame retardant, 0.01-0.04 parts of high temperature resistant color powder, 0.5-1.5 parts of compatibilizer and 0.1-0.4 parts of antioxidant.

[0013] Preferably, the mass ratio of the aluminum hydroxide, styrene-methyl methacrylate block copolymer and SiC is 20-40:1-4:4-10.

[0014] Further preferably, the mass ratio of the aluminum hydroxide, styrene-methyl methacrylate block copolymer and SiC is 25-35:1-3:6-10.

[0015] More preferably, the mass ratio of the aluminum hydroxide, styrene-methyl methacrylate block copolymer and SiC is 30:2:8.

[0016] Preferably, the particle size of the aluminum hydroxide (ATH) is 100-150 μm; further preferably, the particle size of the aluminum hydroxide (ATH) is 120 μm.

[0017] Preferably, the particle size of the SiC is 100-500 μm; further preferably, the particle size of the SiC is 100-300 μm.

[0018] Preferably, the composite flame retardant is prepared by dissolving a styrene-methyl methacrylate block copolymer in tetrahydrofuran, adding aluminum hydroxide and SiC, mixing, and removing the solvent.

[0019] Preferably, the molecular weight of the styrene-methyl methacrylate block copolymer is 10,000-20,000.

[0020] Preferably, the high temperature resistant toner is modified carbon black.

[0021] Further preferably, the modified carbon black is spray carbon black coated with a silane coupling agent.

[0022] Preferably, the mass of the silane coupling agent is 0.1%-3% of the mass of the spray carbon black.

[0023] Preferably, the silane coupling agent is KH-580.

[0024] Preferably, the modified carbon black is prepared by preparing a silane coupling agent into an alcohol solution, mixing the solution with the spray carbon black, and drying the solution.

[0025] Further preferably, the preparation method of the modified carbon black is: preparing a silane coupling agent into an ethanol solution with a mass fraction of the silane coupling agent of 15%-25%, spraying the spray carbon black, stirring for 10-30 minutes, and drying at 100-120°C for 1-3 hours.

[0026] Preferably, the compatibilizer is an oxazoline-type compatibilizer.

[0027] More preferably, the oxazoline compatibilizer is PRS-1005, and the grafting rate is 0.8%-1.2%.

[0028] Preferably, the antioxidant is a mixture of antioxidant 292, antioxidant 3114 and oxalic acid anilide ultraviolet absorber.

[0029] Preferably, the mass ratio of the antioxidant 292, the antioxidant 3114 and the oxalic acid anilide ultraviolet absorber is 1-4:3-5:1-2.

[0030] More preferably, the mass ratio of the antioxidant 292, the antioxidant 3114 and the oxalic acid anilide ultraviolet absorber is 3:4:2.

[0031] Preferably, the oxalic acid anilide ultraviolet absorber is UV-312.

[0032] Preferably, the recycled polypropylene material is selected from at least one of mixed color polypropylene recycled material, automobile interior recycled material, paint bucket recycled material or bottle cap recycled material.

[0033] Further preferably, the recycled polypropylene material is a mixture of mixed color polypropylene recycled material, automobile interior recycled material, paint bucket recycled material and bottle cap recycled material.

[0034] Preferably, the recycled polypropylene material is mixed color polypropylene recycled material, automobile interior recycled material, paint bucket recycled material and bottle cap recycled material in a mass ratio of 3-5:3-5:1-2:1-2.

[0035] Further preferably, the recycled polypropylene material is a mixed color polypropylene recycled material, a car interior recycled material, a paint bucket recycled material and a bottle cap recycled material in a mass ratio of 4:4:1:1.

[0036] In a second aspect, the present invention provides a method for preparing the above-mentioned polypropylene material, comprising the following steps: mixing the raw materials of the polypropylene material and melt-extruding.

[0037] Preferably, the melt extrusion parameters are:

[0038] The temperature of the feeding section is 180-190°C; the temperature of the melting section is 200-210°C; the temperature of the homogenizing section is 210-220°C, the temperature of the die section is 200-210°C, the aspect ratio of the screw is 45-50:1, and the speed is 100-250rpm.

[0039] In a third aspect, the present invention provides the use of the above-mentioned polypropylene material in the preparation of automobile interior and / or electric vehicle accessory materials.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. This invention prepares a composite flame retardant by combining aluminum hydroxide (ATH), SiC, and styrene-methyl methacrylate block copolymer. During combustion, aluminum hydroxide decomposes to produce aluminum oxide and other carbonized products, which together form a solid flame-retardant barrier, effectively isolating the flame from the substrate. Combined with SiC, it offers enhanced light-blocking properties, further enhancing flame retardancy, high-temperature resistance, and aging resistance. Furthermore, aluminum hydroxide and SiC at specific particle sizes also improve the mechanical properties of the recycled polypropylene material.

[0042] 2. The present invention significantly improves the product's high-temperature color change resistance, flame retardancy and weather resistance by using a silane coupling agent to wrap the spray carbon black as modified carbon black.

[0043] 3. The present invention significantly improves the flame resistance, weather resistance and high temperature resistance of recycled polypropylene while ensuring its mechanical properties through the participation of specific components, composite flame retardant, high temperature resistant color powder, oxazoline type compatibilizer and antioxidant, and has synergistic synergy.

[0044] 4. The polypropylene material prepared by the present invention can be widely used in automobile interiors, electric vehicle accessories, etc., and is well received for its good flame resistance, weather resistance, and high temperature resistance. DETAILED DESCRIPTION

[0045] In order to make the technical means, creative features, purpose and effect of the present invention easy to understand, the present invention is further illustrated below in conjunction with specific embodiment, but the following embodiment is only a preferred embodiment of the present invention, not all. Based on the embodiment in the embodiment, other embodiments obtained by those skilled in the art without making creative work all fall within the protection scope of the present invention. It is worth noting that the raw materials used in the present invention are all common commercial products, and their source is not specifically limited. The technology and scientific terms used in the embodiment have the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs.

[0046] Recycled polypropylene material: crushed material recycled by Yamida Environmental Protection Technology Co., Ltd.

[0047] Styrene-methyl methacrylate block copolymer: Guangdong Wengjiang Chemical Reagent Co., Ltd., PA29985.

[0048] Example 1

[0049] A polypropylene material containing recycled materials and aging resistance, the raw materials are shown in Table 1:

[0050] Table 1. Ingredients and quantities

[0051]

[0052] The preparation method of the composite flame retardant comprises the following steps: dissolving a styrene-methyl methacrylate block copolymer in tetrahydrofuran, adding aluminum hydroxide and SiC, mixing the mixture, and removing the solvent.

[0053] The preparation method of modified carbon black is as follows: silane coupling agent KH-580 is configured into an ethanol solution with a mass fraction of 20%, sprayed on spray carbon black so that the mass of the silane coupling agent is about 2% of the spray carbon black, stirred for 30 minutes, and dried at 115°C for 2 hours.

[0054] The preparation method of the recycled and aging-resistant polypropylene material is as follows:

[0055] The raw materials of the above-mentioned polypropylene materials are mixed and melt-extruded. The parameters of the melt-extrusion are:

[0056] The temperature of the feeding section is 180-190°C; the temperature of the melting section is 200-210°C; the temperature of the homogenizing section is 210-220°C, the temperature of the die section is 200-210°C, the aspect ratio of the screw is 50:1, and the speed is 100-250rpm.

[0057] Example 2

[0058] A polypropylene material containing recycled materials and aging resistance, the raw materials are shown in Table 2:

[0059] Table 2. Ingredients and quantities

[0060]

[0061] The preparation method of the composite flame retardant comprises the following steps: dissolving a styrene-methyl methacrylate block copolymer in tetrahydrofuran, adding aluminum hydroxide and SiC, mixing the mixture, and removing the solvent.

[0062] The preparation method of modified carbon black is as follows: silane coupling agent KH-580 is configured into an ethanol solution with a mass fraction of 15%, sprayed on spray carbon black so that the mass of the silane coupling agent is about 0.1% of the spray carbon black, stirred for 10 minutes, and dried at 100°C for 3 hours.

[0063] The preparation method of the recycled and aging-resistant polypropylene material is as follows:

[0064] The raw materials of the above-mentioned polypropylene materials are mixed and melt-extruded. The parameters of the melt-extrusion are:

[0065] The temperature of the feeding section is 180-190°C; the temperature of the melting section is 200-210°C; the temperature of the homogenizing section is 210-220°C, the temperature of the die section is 200-210°C, the screw aspect ratio is 45:1, and the speed is 100-250rpm.

[0066] Example 3

[0067] A polypropylene material containing recycled materials and aging resistance, the raw materials are shown in Table 3:

[0068] Table 3. Ingredients and quantities

[0069]

[0070] The preparation method of the composite flame retardant comprises the following steps: dissolving a styrene-methyl methacrylate block copolymer in tetrahydrofuran, adding aluminum hydroxide and SiC, mixing the mixture, and removing the solvent.

[0071] The preparation method of modified carbon black is as follows: silane coupling agent KH-580 is configured into an ethanol solution with a mass fraction of 25%, sprayed on spray carbon black so that the mass of the silane coupling agent is about 3% of the spray carbon black, stirred for 20 minutes, and dried at 120°C for 1 hour.

[0072] The preparation method of the recycled and aging-resistant polypropylene material is as follows:

[0073] The raw materials of the above-mentioned polypropylene materials are mixed and melt-extruded. The parameters of the melt-extrusion are:

[0074] The temperature of the feeding section is 180-190°C; the temperature of the melting section is 200-210°C; the temperature of the homogenizing section is 210-220°C, the temperature of the die section is 200-210°C, the screw aspect ratio is 48:1, and the speed is 100-250rpm.

[0075] Comparative Example 1

[0076] A polypropylene material containing recycled materials and aging resistance, the raw materials are shown in Table 4. Compared with Example 1, aluminum hydroxide is used instead of the composite flame retardant:

[0077] Table 4. Ingredients and quantities

[0078]

[0079] The preparation method of modified carbon black is as follows: silane coupling agent KH-580 is configured into an ethanol solution with a mass fraction of 20%, sprayed on spray carbon black so that the mass of the silane coupling agent is about 2% of the spray carbon black, stirred for 30 minutes, and dried at 115°C for 2 hours.

[0080] The preparation method of the recycled and aging-resistant polypropylene material is as follows:

[0081] The raw materials of the above-mentioned polypropylene materials are mixed and melt-extruded. The parameters of the melt-extrusion are:

[0082] The temperature of the feeding section is 180-190°C; the temperature of the melting section is 200-210°C; the temperature of the homogenizing section is 210-220°C, the temperature of the die section is 200-210°C, the aspect ratio of the screw is 50:1, and the speed is 100-250rpm.

[0083] Comparative Example 2

[0084] A polypropylene material containing recycled materials and aging resistance, the raw materials are shown in Table 5. Compared with Example 1, ammonium polyphosphate (APP) is used instead of aluminum hydroxide (ATH):

[0085] Table 5. Ingredients and quantities

[0086]

[0087] The preparation method of the composite flame retardant comprises the following steps: dissolving a styrene-methyl methacrylate block copolymer in tetrahydrofuran, adding ammonium polyphosphate and SiC, mixing, and removing the solvent.

[0088] The preparation method of modified carbon black is as follows: silane coupling agent KH-580 is configured into an ethanol solution with a mass fraction of 20%, sprayed on spray carbon black so that the mass of the silane coupling agent is about 2% of the spray carbon black, stirred for 30 minutes, and dried at 115°C for 2 hours.

[0089] The preparation method of the recycled and aging-resistant polypropylene material is as follows:

[0090] The raw materials of the above-mentioned polypropylene materials are mixed and melt-extruded. The parameters of the melt-extrusion are:

[0091] The temperature of the feeding section is 180-190°C; the temperature of the melting section is 200-210°C; the temperature of the homogenizing section is 210-220°C, the temperature of the die section is 200-210°C, the aspect ratio of the screw is 50:1, and the speed is 100-250rpm.

[0092] Comparative Example 3

[0093] A polypropylene material containing recycled materials and aging resistance, compared with Example 1, the mass ratio of each component in the composite flame retardant is changed, and the raw materials are shown in Table 6:

[0094] Table 6. Ingredients and quantities

[0095]

[0096] The preparation method of the composite flame retardant comprises the following steps: dissolving a styrene-methyl methacrylate block copolymer in tetrahydrofuran, adding aluminum hydroxide and SiC, mixing the mixture, and removing the solvent.

[0097] The preparation method of modified carbon black is as follows: silane coupling agent KH-580 is configured into an ethanol solution with a mass fraction of 20%, sprayed on spray carbon black so that the mass of the silane coupling agent is about 2% of the spray carbon black, stirred for 30 minutes, and dried at 115°C for 2 hours.

[0098] The preparation method of the recycled and aging-resistant polypropylene material is as follows:

[0099] The raw materials of the above-mentioned polypropylene materials are mixed and melt-extruded. The parameters of the melt-extrusion are:

[0100] The temperature of the feeding section is 180-190°C; the temperature of the melting section is 200-210°C; the temperature of the homogenizing section is 210-220°C, the temperature of the die section is 200-210°C, the aspect ratio of the screw is 50:1, and the speed is 100-250rpm.

[0101] Comparative Example 4

[0102] A polypropylene material containing recycled materials and aging resistance, compared with Example 1, only the particle size of the raw material aluminum hydroxide (ATH) is changed to 200 μm, the particle size of SiC is changed to 50 μm, and the rest is the same as Example 1.

[0103] Comparative Example 5

[0104] A polypropylene material containing recycled materials and aging resistance, compared with Example 1, uses spray carbon black instead of modified carbon black, the raw materials are shown in Table 7:

[0105] Table 7. Ingredients and quantities

[0106]

[0107] The preparation method of the composite flame retardant comprises the following steps: dissolving a styrene-methyl methacrylate block copolymer in tetrahydrofuran, adding aluminum hydroxide and SiC, mixing the mixture, and removing the solvent.

[0108] The preparation method of the recycled and aging-resistant polypropylene material is as follows:

[0109] The raw materials of the above-mentioned polypropylene materials are mixed and melt-extruded. The parameters of the melt-extrusion are:

[0110] The temperature of the feeding section is 180-190°C; the temperature of the melting section is 200-210°C; the temperature of the homogenizing section is 210-220°C, the temperature of the die section is 200-210°C, the aspect ratio of the screw is 50:1, and the speed is 100-250rpm.

[0111] Comparative Example 6

[0112] A polypropylene material containing recycled materials and aging resistance, compared with Example 1, uses maleic anhydride grafted PP (grafting rate 1%) instead of PRS-1005, the raw materials are shown in Table 8:

[0113] Table 8. Ingredients and quantities

[0114]

[0115] The preparation method of the composite flame retardant comprises the following steps: dissolving a styrene-methyl methacrylate block copolymer in tetrahydrofuran, adding aluminum hydroxide and SiC, mixing the mixture, and removing the solvent.

[0116] The preparation method of modified carbon black is as follows: silane coupling agent KH-580 is configured into an ethanol solution with a mass fraction of 20%, sprayed on spray carbon black so that the mass of the silane coupling agent is about 2% of the spray carbon black, stirred for 30 minutes, and dried at 115°C for 2 hours.

[0117] The preparation method of the recycled and aging-resistant polypropylene material is as follows:

[0118] The raw materials of the above-mentioned polypropylene materials are mixed and melt-extruded. The parameters of the melt-extrusion are:

[0119] The temperature of the feeding section is 180-190°C; the temperature of the melting section is 200-210°C; the temperature of the homogenizing section is 210-220°C, the temperature of the die section is 200-210°C, the aspect ratio of the screw is 50:1, and the speed is 100-250rpm.

[0120] Comparative Example 7

[0121] A polypropylene material containing recycled materials and aging resistance. Compared with Example 1, the antioxidant is changed to antioxidant 292. The raw materials are shown in Table 9:

[0122] Table 9. Ingredients and quantities

[0123]

[0124] The rest is the same as Example 1.

[0125] Comparative Example 8

[0126] A polypropylene material containing recycled materials and aging resistance. Compared with Example 1, the antioxidant is changed to antioxidant 3114. The raw materials are shown in Table 10:

[0127] Table 10. Ingredients and quantities

[0128]

[0129] The rest is the same as Example 1.

[0130] Comparative Example 9

[0131] A polypropylene material containing recycled materials and aging resistance, compared with Example 1, the antioxidant is changed to UV-312, and the raw materials are shown in Table 11:

[0132] Table 11. Ingredients and quantities

[0133]

[0134] The rest is the same as Example 1.

[0135] Comparative Example 10

[0136] A polypropylene material containing recycled materials and aging resistance, compared with Example 1, the mass ratio of the antioxidant component is changed, and the raw materials are shown in Table 12:

[0137] Table 12. Ingredients and quantities

[0138]

[0139] The rest is the same as Example 1.

[0140] Comparative Example 11

[0141] A polypropylene material containing recycled materials and aging resistance, compared with Example 1, the number of raw materials is different, and the raw materials are shown in Table 13:

[0142] Table 13. Ingredients and quantities

[0143]

[0144] The rest is the same as Example 1.

[0145] Test Case

[0146] The polypropylene materials prepared in Examples 1-3 and Comparative Examples 1-11 were injection molded using a horizontal injection molding machine to produce standard specimens. Molding conditions were as follows: injection temperature (feed port): 185°C / 190°C / 190°C / 195°C (nozzle); injection pressure: 55 MPa; dwell time: 8 seconds; cooling time: 8 seconds; and drying at 105°C for 2 hours before injection molding. Performance tests were conducted according to the following standards. The results are shown in Tables 14 and 15.

[0147] Melt index: tested according to ASTM D1238-2010, 230°C, 2.16 kg, unit: g / 10 min;

[0148] Tensile strength: tested according to ASTM D638-2010 standard, thickness 3.0mm specimen, unit: MPa;

[0149] Bending properties: According to ASTM D790-2017 standard, thickness of 3.0mm specimen, unit: MPa;

[0150] Izod notched impact performance: tested according to ASTM D256-2010 standard, 3.0mm thick specimen, unit: J / m;

[0151] High temperature aging test: The tensile specimens, bending specimens and cantilever beam notched impact specimens were placed in a 150°C oven for 1000 hours to test various properties;

[0152] UV aging test: Tensile specimens, bending specimens, and cantilever beam notched impact specimens were placed in a UV chamber for 1500 hours to test various properties. Light source: UVA-340, light intensity: 0.76W, cycle conditions: 8 hours of illumination (BPT: 60°C), 4 hours of condensation (BPT: 50°C) (GB / T16422.3);

[0153] Flame retardant performance: tested in accordance with the testing standards provided by UL-94.

[0154] Yellowing index: According to GB / T16422.2-1999 Plastic Laboratory Light Source Exposure Test Method, place the sample in a xenon lamp exposure yellowing test chamber for irradiation, and then measure its yellowness index according to GB2409-80 Plastic Yellowness Index Test Method.

[0155] Table 14. Performance test results of the embodiment

[0156]

[0157] Table 15. Comparative performance test results

[0158]

[0159] As shown in Tables 14-15, the polypropylene materials prepared in the embodiments of the present invention significantly improved their flame retardancy, high temperature resistance, yellowing resistance, and aging resistance while maintaining good mechanical properties compared to the comparative examples. Compared with the examples, comparative examples 1-3 changed the composition and ratio of the flame retardant, respectively, and their flame retardancy decreased significantly; comparative example 4 changed the particle size of ATH and SiC, and while the flame retardancy decreased, the mechanical properties also decreased; comparative example 5 replaced modified carbon black with spray carbon black, and its anti-yellowing performance decreased significantly; comparative example 6 replaced the compatibilizer, and the mechanical properties of the product decreased significantly, and the flame retardancy, high temperature resistance, and aging resistance also decreased; comparative examples 7-10 changed the composition or ratio of the antioxidant, and the aging resistance of the product decreased significantly, and its high temperature resistance, yellowing resistance, and flame retardancy also decreased; comparative example 11 changed the number of raw materials, and its flame retardancy, high temperature resistance, yellowing resistance, and aging resistance all decreased. It is proved that only the polypropylene prepared with the specific raw materials and proportions of this application can significantly improve its flame retardancy, high temperature resistance, yellowing resistance and aging resistance while maintaining good mechanical properties.

[0160] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A polypropylene material containing recycled materials and aging resistance, characterized in that: The composition comprises the following components in parts by mass: 60-100 parts of recycled polypropylene material, 0.1-5 parts of composite flame retardant, 0.001-0.1 parts of high temperature resistant color powder, 0.1-3 parts of compatibilizer and 0.01-1 parts of antioxidant; The composite flame retardant comprises aluminum hydroxide, styrene-methyl methacrylate block copolymer and SiC; the mass ratio of the aluminum hydroxide, styrene-methyl methacrylate block copolymer and SiC is 20-40:1-4:4-10; The particle size of the aluminum hydroxide is 100-150 μm; the particle size of the SiC is 100-500 μm; The high temperature resistant toner is modified carbon black, which is spray carbon black coated with a silane coupling agent, the mass of the silane coupling agent is 0.1%-3% of the mass of the spray carbon black, and the silane coupling agent is KH-580; The compatibilizer is an oxazoline-type compatibilizer, and the oxazoline-type compatibilizer is PRS-1005; The antioxidant is a mixture of antioxidant 292, antioxidant 3114 and oxalylanilide ultraviolet absorber; the mass ratio of the antioxidant 292, antioxidant 3114 and oxalylanilide ultraviolet absorber is 1-4:3-5:1-2; the oxalylanilide ultraviolet absorber is UV-312.

2. The polypropylene material according to claim 1, characterized in that The grafting rate of the PRS-1005 is 0.8%-1.2%.

3. The polypropylene material according to claim 1, characterized in that The recycled polypropylene material is selected from at least one of mixed-color polypropylene recycled materials, automobile interior recycled materials, paint bucket recycled materials or bottle cap recycled materials.

4. The method for preparing the polypropylene material according to any one of claims 1 to 3, characterized in that: The method comprises the following steps: mixing the raw materials of the polypropylene material and melt-extruding the mixture.

5. Use of the polypropylene material according to any one of claims 1 to 3 in the preparation of automotive interior materials.

6. Use of the polypropylene material according to any one of claims 1 to 3 in the preparation of electric vehicle accessory materials.

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