Ageing-resistant polypropylene material containing reclaimed materials as well as preparation method and application of aging-resistant polypropylene material

Abstract

The invention provides an aging-resistant polypropylene material containing reclaimed materials as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The polypropylene material is prepared from the following raw materials: a recycled polypropylene material, a composite flame retardant, high-temperature-resistant toner, a compatilizer and an antioxidant, wherein the composite flame retardant is prepared from aluminum hydroxide, a styrene-methyl methacrylate block copolymer and SiC. The weather resistance, the high temperature resistance and the flame retardance of the prepared polypropylene material are remarkably improved through the combined action of all the components in a specific proportion, and meanwhile the mechanical property of the polypropylene material is guaranteed. The polypropylene material can be widely applied to automotive interiors, electric vehicle accessories and the like.

Description

Technical Field

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

[0002] Polypropylene (PP) is one of the five general-purpose resins, and has excellent properties such as light weight, easy processing, and chemical resistance, and is widely used in the fields of chemical industry, electrical appliances, packaging, automobiles, construction, etc. However, with the increase in the use of plastics, waste PP plastics have caused serious environmental pollution problems and economic waste. Therefore, the rational use of PP recycled materials can effectively reduce the harm of plastic waste to the environment and protect the ecological environment. At the same time, the use of recycled PP crushed materials can also save resources, reduce the demand for new raw materials, promote the reuse of resources, and thus achieve the effective management of resources and environmental protection.

[0003] Polypropylene materials are widely used in the fields of construction, automobiles, electrical appliances, etc. Due to their application scenarios, they have high requirements for weather resistance, high temperature resistance, and flame retardancy. For example, building pipes, automotive exterior parts, etc. are exposed to ultraviolet rays, temperature and humidity changes for a long time, and the materials need to be anti-aging to avoid embrittlement, discoloration or performance degradation. Therefore, high weather resistance and the ability to resist discoloration are required. The engine compartments of automobiles, electronic and electrical components, etc. need to withstand continuous high temperatures of 100-120°C to avoid deformation or failure. Therefore, excellent high temperature resistance is required. Fields such as electronics and electrical appliances, automotive interiors, etc. need to meet flame retardancy standards (such as UL94) to reduce the risk of fire. Therefore, good flame retardancy is required.

[0004] Most of the recycled waste polypropylene comes from waste plastics. After being used, plastics will inevitably age to a certain extent, the molecular weight will decrease, and at the same time, due to the migration of processing aids or additives, the mechanical properties and other properties of waste plastics will become lower. Therefore, more attention needs to be paid to the performance improvement and maintenance 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 deodorants, and 5-10 parts of LLDPE. The invention increases the weather resistance of the material by adding part of LLDPE to the 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 a preparation method thereof. The modified material for producing polypropylene sheets is made of the following components by mass: 10-20 parts of base polypropylene, 30-50 parts of recycled polypropylene, 10-15 parts of cis-4-heptene aldehyde grafted polypropylene, 100-120 parts of inorganic filler, 1-2 parts of modified titanate coupling agent, 0.2-1 parts of aluminate coupling agent, 5-10 parts of polyethylene wax, 1-2 parts of light stabilizer, and 0.1-0.5 parts of antioxidant. The polypropylene sheet produced using the modified material has the advantages of high impact strength, high bending modulus and high temperature resistance. "Weather resistance and flame retardant properties of recycled polypropylene-based composite materials" (You Yilan et al., Journal of Packaging, Vol. 16, No. 3, 2024) Tea-plastic composite materials were prepared using RPP and tea powder as raw materials, and Nano-TiO2 was added to improve the mechanical properties and weather resistance of the composite materials, and APP was used to improve the flame retardant properties of the composite materials. However, the above-mentioned existing technologies either specifically improve weather resistance or high temperature resistance, or only modify both weather resistance and flame retardancy, and there is no 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] In view of the above problems, the present invention provides a polypropylene material containing recycled materials and resistant to aging. Through the joint action of various components in a specific ratio, the weather resistance, high temperature resistance and flame retardancy of the prepared polypropylene material are significantly improved, while its mechanical properties are guaranteed. The polypropylene material can be widely used in automotive interiors, electric vehicle accessories and the like.

[0008] To achieve the above purpose, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a recycled material-containing and aging-resistant polypropylene material, 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), a styrene-methyl methacrylate block copolymer, and SiC.

[0009] Preferably, the polypropylene material, by mass parts, comprises the following components: 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 part of antioxidant.

[0010] More preferably, the polypropylene material, by mass parts, comprises the following components: 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 part of antioxidant.

[0011] Even more preferably, the polypropylene material, by mass parts, comprises the following components: 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 part of antioxidant.

[0012] Preferably, the mass ratio of aluminum hydroxide, styrene-methyl methacrylate block copolymer, and SiC is 20-40:1-4:4-10.

[0013] More preferably, the mass ratio of aluminum hydroxide, styrene-methyl methacrylate block copolymer, and SiC is 25-35:1-3:6-10.

[0014] Even more preferably, the mass ratio of aluminum hydroxide, styrene-methyl methacrylate block copolymer, and SiC is 30:2:8.

[0015] Preferably, the particle size of the aluminum hydroxide (ATH) is 100-150 μm; more preferably, the particle size of the aluminum hydroxide (ATH) is 120 μm.

[0016] Preferably, the particle size of the SiC is 100-500 μm; more preferably, the particle size of the SiC is 100-300 μm.

[0017] Preferably, the preparation method of the composite flame retardant is: dissolving the styrene-methyl methacrylate block copolymer in tetrahydrofuran, adding aluminum hydroxide and SiC, mixing, and removing the solvent.

[0018] Preferably, the molecular weight of the styrene-methyl methacrylate block copolymer is 10000-20000.

[0019] Preferably, the high-temperature resistant color powder is modified carbon black.

[0020] More preferably, the modified carbon black is spray carbon black encapsulated with a silane coupling agent.

[0021] Preferably, the mass of the silane coupling agent is 0.1% - 3% of the mass of the spray carbon black.

[0022] Preferably, the silane coupling agent is KH-580.

[0023] Preferably, the preparation method of the modified carbon black is: configuring the silane coupling agent into an alcohol solution, mixing it with the spray carbon black, and drying.

[0024] More preferably, the preparation method of the modified carbon black is: configuring the silane coupling agent into an ethanol solution with a mass fraction of 15% - 25%, spraying it on the spray carbon black, stirring for 10 - 30 min, and drying at 100 - 120 °C for 1 - 3 h.

[0025] Preferably, the compatibilizer is an oxazoline-based compatibilizer.

[0026] More preferably, the oxazoline-based compatibilizer is PRS-1005 with a grafting rate of 0.8% - 1.2%.

[0027] Preferably, the antioxidant is a mixture of antioxidant 292, antioxidant 3114, and an oxanilide-based ultraviolet absorber.

[0028] Preferably, the mass ratio of antioxidant 292, antioxidant 3114, and the oxanilide-based ultraviolet absorber is 1 - 4:3 - 5:1 - 2.

[0029] Even more preferably, the mass ratio of antioxidant 292, antioxidant 3114, and the oxanilide-based ultraviolet absorber is 3:4:2.

[0030] Preferably, the oxanilide-based ultraviolet absorber is UV-312.

[0031] Preferably, the recycled polypropylene material is selected from at least one of variegated propylene recycled material, automotive interior recycled material, paint bucket recycled material, or bottle cap recycled material.

[0032] More preferably, the recycled polypropylene material is a mixture of variegated propylene recycled material, automotive interior recycled material, paint bucket recycled material, and bottle cap recycled material.

[0033] Preferably, the mass ratio of the variegated propylene recycled material, automotive interior recycled material, paint bucket recycled material, and bottle cap recycled material is 3 - 5:3 - 5:1 - 2:1 - 2.

[0034] Further preferably, the mass ratio of the recycled polypropylene materials, namely the variegated propylene recycled material, the recycled automotive interior material, the recycled paint bucket material and the recycled bottle cap material, is 4:4:1:1.

[0035] Second, the present invention provides a method for preparing the above-mentioned polypropylene material, which comprises the following steps: mixing the raw materials of the polypropylene material and melt-extruding them.

[0036] Preferably, the parameters of the melt-extrusion are as follows: The temperature of the feeding section is 180 - 190 °C; the temperature of the melting section is 200 - 210 °C; the temperature of the homogenization section is 210 - 220 °C, the temperature of the die head section is 200 - 210 °C, the screw length-diameter ratio is 45 - 50:1, and the rotation speed is 100 - 250 rpm.

[0037] Third, the present invention provides the application of the above-mentioned polypropylene material in the preparation of automotive interior and / or electric vehicle accessory materials.

[0038] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, a composite flame retardant is prepared by compounding aluminum hydroxide (ATH), SiC and styrene-methyl methacrylate block copolymer. As a flame retardant, aluminum hydroxide can decompose during the combustion process, and the generated alumina and other carbonized products jointly build a solid flame retardant barrier, effectively isolating the direct contact between the flame and the substrate. When used in combination with SiC, it has stronger light-shielding property, further enhancing the flame retardancy, high-temperature resistance and aging resistance. At the same time, aluminum hydroxide and SiC with specific particle sizes also improve the mechanical properties of the recycled polypropylene material.

[0039] 2. In the present invention, spray carbon black wrapped with a silane coupling agent is used as modified carbon black, significantly improving the high-temperature color change performance, flame retardancy and weather resistance of the product.

[0040] 3. In the present invention, with the participation of specific components, namely the composite flame retardant, high-temperature resistant color powder, oxazoline-based compatibilizer and antioxidant, while ensuring the mechanical properties of the recycled polypropylene, its flame resistance, weather resistance and high-temperature resistance are significantly improved, showing a synergistic effect.

[0041] 4. The polypropylene material prepared by the present invention can be widely used in automotive interiors, electric vehicle accessories, etc., and is well received due to its good flame resistance, weather resistance and high-temperature resistance. Specific Embodiments

[0042] In order to make the technical means, creative features, achieved objectives and functions of the present invention easy to understand, the present invention will be further illustrated below in conjunction with specific embodiments. However, the following embodiments are only the preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative efforts 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 ordinary commercially available products, and no specific limitation is made on their sources. The technical and scientific terms used in the embodiments have the meanings commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0043] Recycled polypropylene material: The crushed material recycled by Yameida Environmental Protection Technology Co., Ltd.

[0044] Styrene-methyl methacrylate block copolymer: Guangdong Wengjiang Chemical Reagent Co., Ltd., PA29985.

[0045] Example 1 A polypropylene material containing recycled materials and resistant to aging, the raw materials are shown in Table 1: Table 1. Raw materials and parts

[0046] The preparation method of the composite flame retardant is: dissolve the styrene-methyl methacrylate block copolymer in tetrahydrofuran, add aluminum hydroxide and SiC, mix, and remove the solvent.

[0047] The preparation method of the modified carbon black is: prepare an ethanol solution of the silane coupling agent KH-580, the mass fraction of the silane coupling agent is 20%, spray it on the spray carbon black, so that the mass of the silane coupling agent is about 2% of the spray carbon black, stir for 30 min, and dry at 115 °C for 2 h.

[0048] The preparation method of the polypropylene material containing recycled materials and resistant to aging is: Mix the raw materials of the above polypropylene material, and carry out melt extrusion. The parameters of the melt extrusion are: 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 head section is 200 - 210 °C, the screw length-diameter ratio is 50:1, and the rotation speed is 100 - 250 rpm.

[0049] Example 2 A polypropylene material containing recycled materials and resistant to aging, the raw materials are shown in Table 2: Table 2. Raw materials and parts

[0050] The preparation method of the composite flame retardant is as follows: Dissolve the styrene-methyl methacrylate block copolymer in tetrahydrofuran, add aluminum hydroxide and SiC, mix, and remove the solvent.

[0051] The preparation method of the modified carbon black is as follows: Prepare an ethanol solution of the silane coupling agent KH-580, with the mass fraction of the silane coupling agent being 15%. Spray the spray carbon black so that the mass of the silane coupling agent is about 0.1% of the spray carbon black. Stir for 10 min and dry at 100 °C for 3 h.

[0052] The preparation method of the recycled material-containing and aging-resistant polypropylene material is as follows: Mix the raw materials of the above polypropylene material and melt-extrude them. The parameters of the melt-extrusion are as follows: 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 head section is 200 - 210 °C, the screw length-diameter ratio is 45:1, and the rotation speed is 100 - 250 rpm.

[0053] Example 3 A recycled material-containing and aging-resistant polypropylene material, the raw materials are shown in Table 3: Table 3. Raw materials and parts

[0054] The preparation method of the composite flame retardant is as follows: Dissolve the styrene-methyl methacrylate block copolymer in tetrahydrofuran, add aluminum hydroxide and SiC, mix, and remove the solvent.

[0055] The preparation method of the modified carbon black is as follows: Prepare an ethanol solution of the silane coupling agent KH-580, with the mass fraction of the silane coupling agent being 25%. Spray the spray carbon black so that the mass of the silane coupling agent is about 3% of the spray carbon black. Stir for 20 min and dry at 120 °C for 1 h.

[0056] The preparation method of the recycled material-containing and aging-resistant polypropylene material is as follows: Mix the raw materials of the above polypropylene material and melt-extrude them. The parameters of the melt-extrusion are as follows: 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 head section is 200 - 210 °C, the screw length-diameter ratio is 48:1, and the rotation speed is 100 - 250 rpm.

[0057] Comparative Example 1 A recycled material-containing and aging-resistant polypropylene material, the raw materials are shown in Table 4. Compared with Example 1, aluminum hydroxide is used instead of the composite flame retardant: Table 4. Raw materials and parts

[0058] The preparation method of the modified carbon black is as follows: Prepare an ethanol solution of silane coupling agent KH-580 with a mass fraction of the silane coupling agent of 20%, spray it on the spray carbon black so that the mass of the silane coupling agent is about 2% of the spray carbon black, stir for 30 min, and dry at 115 °C for 2 h.

[0059] The preparation method of the recycled material-containing and aging-resistant polypropylene material is as follows: Mix the raw materials of the above polypropylene material and melt-extrude them. The parameters of the melt extrusion are as follows: 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 head section is 200 - 210 °C, the screw length-diameter ratio is 50:1, and the rotation speed is 100 - 250 rpm.

[0060] Comparative Example 2 A recycled material-containing and aging-resistant polypropylene material, the raw materials are shown in Table 5. Compared with Example 1, ammonium polyphosphate (APP) is used instead of aluminum hydroxide (ATH) agent: Table 5. Raw materials and parts

[0061] The preparation method of the composite flame retardant is as follows: Dissolve the styrene-methyl methacrylate block copolymer in tetrahydrofuran, add ammonium polyphosphate and SiC, mix, and remove the solvent.

[0062] The preparation method of the modified carbon black is as follows: Prepare an ethanol solution of silane coupling agent KH-580 with a mass fraction of the silane coupling agent of 20%, spray it on the spray carbon black so that the mass of the silane coupling agent is about 2% of the spray carbon black, stir for 30 min, and dry at 115 °C for 2 h.

[0063] The preparation method of the recycled material-containing and aging-resistant polypropylene material is as follows: Mix the raw materials of the above polypropylene material and melt-extrude them. The parameters of the melt extrusion are as follows: 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 head section is 200 - 210 °C, the screw length-diameter ratio is 50:1, and the rotation speed is 100 - 250 rpm.

[0064] Comparative Example 3 A recycled material-containing and aging-resistant polypropylene material. 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: Table 6. Raw materials and parts

[0065] The preparation method of the composite flame retardant is as follows: Dissolve the styrene-methyl methacrylate block copolymer in tetrahydrofuran, add aluminum hydroxide and SiC, mix, and remove the solvent.

[0066] The preparation method of the modified carbon black is as follows: Prepare an ethanol solution of the silane coupling agent KH-580 with a mass fraction of the silane coupling agent of 20%, spray it on the spray carbon black so that the mass of the silane coupling agent is about 2% of the spray carbon black, stir for 30 min, and dry at 115 °C for 2 h.

[0067] The preparation method of the polypropylene material containing recycled materials and resistant to aging is as follows: Mix the raw materials of the above polypropylene material and melt-extrude them. The parameters of the melt extrusion are as follows: The temperature of the feeding section is 180-190 °C; the temperature of the melting section is 200-210 °C; the temperature of the homogenization section is 210-220 °C, the temperature of the die head section is 200-210 °C, the screw length-diameter ratio is 50:1, and the rotation speed is 100-250 rpm.

[0068] Comparative Example 4 A polypropylene material containing recycled materials and resistant to aging, compared with Example 1, only changes the particle size of the raw material aluminum hydroxide (ATH) to 200 μm and the particle size of SiC to 50 μm, and the rest is the same as in Example 1.

[0069] Comparative Example 5 A polypropylene material containing recycled materials and resistant to aging, compared with Example 1, uses spray carbon black instead of modified carbon black, and the raw materials are shown in Table 7: Table 7. Raw materials and parts

[0070] The preparation method of the composite flame retardant is as follows: Dissolve the styrene-methyl methacrylate block copolymer in tetrahydrofuran, add aluminum hydroxide and SiC, mix, and remove the solvent.

[0071] The preparation method of the polypropylene material containing recycled materials and resistant to aging is as follows: Mix the raw materials of the above polypropylene material and melt-extrude them. The parameters of the melt extrusion are as follows: The temperature of the feeding section is 180-190 °C; the temperature of the melting section is 200-210 °C; the temperature of the homogenization section is 210-220 °C, the temperature of the die head section is 200-210 °C, the screw length-diameter ratio is 50:1, and the rotation speed is 100-250 rpm.

[0072] Comparative Example 6 A polypropylene material containing recycled materials and resistant to aging. Compared with Example 1, maleic anhydride grafted PP (grafting rate of 1%) is used instead of PRS-1005, and the raw materials are shown in Table 8: Table 8. Raw materials and parts

[0073] The preparation method of the composite flame retardant is as follows: Dissolve the styrene-methyl methacrylate block copolymer in tetrahydrofuran, add aluminum hydroxide and SiC, mix, and remove the solvent.

[0074] The preparation method of the modified carbon black is as follows: Prepare an ethanol solution of the silane coupling agent KH-580, with the mass fraction of the silane coupling agent being 20%. Spray the spray carbon black so that the mass of the silane coupling agent is about 2% of the spray carbon black. Stir for 30 min and dry at 115 °C for 2 h.

[0075] The preparation method of the polypropylene material containing recycled materials and resistant to aging is as follows: Mix the raw materials of the above polypropylene material and melt-extrude them. The parameters of the melt-extrusion are as follows: 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 head section is 200 - 210 °C, the screw length-diameter ratio is 50:1, and the rotation speed is 100 - 250 rpm.

[0076] Comparative Example 7 A polypropylene material containing recycled materials and resistant to aging. Compared with Example 1, the antioxidant is changed to antioxidant 292, and the raw materials are shown in Table 9: Table 9. Raw materials and parts

[0077] The rest is the same as in Example 1.

[0078] Comparative Example 8 A polypropylene material containing recycled materials and resistant to aging. Compared with Example 1, the antioxidant is changed to antioxidant 3114, and the raw materials are shown in Table 10: Table 10. Raw materials and parts

[0079] The rest is the same as in Example 1.

[0080] Comparative Example 9 A polypropylene material containing recycled materials and resistant to aging. Compared with Example 1, the antioxidant is changed to UV-312, and the raw materials are shown in Table 11: Table 11. Raw materials and parts

[0081] The rest is the same as in Example 1.

[0082] Comparative Example 10 A recycled material-containing and aging-resistant polypropylene material, compared with Example 1, the mass ratio of antioxidant components is changed, and the raw materials are shown in Table 12: Table 12. Raw materials and parts

[0083] The rest is the same as in Example 1.

[0084] Comparative Example 11 A recycled material-containing and aging-resistant polypropylene material, compared with Example 1, the parts of each raw material are different, and the raw materials are shown in Table 13: Table 13. Raw materials and parts

[0085] The rest is the same as in Example 1.

[0086] Test Example The polypropylene materials prepared in Examples 1-3 and Comparative Examples 1-11 were injection molded using a horizontal injection molding machine to obtain standard specimens. The molding process conditions were as follows: injection temperature (feeding port) 185 / 190 / 190 / 195 °C (nozzle); injection pressure 55 MPa; holding pressure time 8 s; cooling time 8 s. Before injection molding, the materials were dried at 105 °C for 2 h. Performance tests were carried out respectively, and the standards for each performance test were as follows, and the results are shown in Tables 14-15.

[0087] Melt index: Tested according to ASTM D1238-2010 standard, at 230 °C, 2.16 Kg, unit: g / 10 min; Tensile strength: Tested according to ASTM D638-2010 standard, for a 3.0 mm thick specimen, unit: MPa; Flexural properties: Conducted according to ASTM D790-2017 standard, for a 3.0 mm thick specimen, unit: MPa; Izod notched impact strength: Tested according to ASTM D256-2010 standard, for a 3.0 mm thick specimen, unit: J / m; High-temperature aging test: The tensile specimens, flexural specimens and Izod notched impact specimens were placed in an oven at 150 °C for 1000 h, and various properties were tested; UV Aging Test: Place the tensile specimens, bending specimens, and notched Izod impact specimens in a UV chamber for 1500 h of irradiation, and test various properties. Light source: UVA-340, light intensity: 0.76 W, cycling conditions: 8 h of light exposure (BPT: 60 °C), 4 h of condensation (BPT: 50 °C) (GB / T 16422.3); Flame Retardancy: Test according to the detection standards provided by UL-94.

[0088] Yellowing Index: According to GB / T 16422.2-1999 Test Method for Exposure of Plastics to Laboratory Light Sources, place it in a xenon lamp exposure yellowing test chamber for irradiation, and then measure its yellowing index according to GB 2409-80 Test Method for Yellow Index of Plastics.

[0089] Table 14. Performance Test Results of Examples

[0090] Table 15. Performance Test Results of Comparative Examples

[0091] As can be seen from Tables 14-15, compared with the comparative examples, the polypropylene materials prepared in the examples of the present invention, while maintaining good mechanical properties, significantly improve their flame retardancy, high temperature resistance, yellowing resistance, and aging resistance. Compared with the examples, in Comparative Example 1-Comparative Example 3, the composition and ratio of the flame retardant were changed respectively, and their flame retardancy decreased significantly; in Comparative Example 4, the particle sizes of ATH and SiC were changed, and while the flame retardancy decreased, the mechanical properties also decreased; in Comparative Example 5, spray carbon black was used instead of modified carbon black, and its yellowing resistance decreased significantly; in Comparative Example 6, the compatibilizer was replaced, and the mechanical properties of the product decreased significantly, and the flame retardancy, high temperature resistance, and aging resistance also decreased; in Comparative Example 7-Comparative Example 10, the composition or ratio of the antioxidant was changed, and the aging resistance of the product decreased significantly, and its high temperature resistance, yellowing resistance, and flame retardancy also decreased; in Comparative Example 11, the parts of the raw materials were changed, and its flame retardancy, high temperature resistance, yellowing resistance, and aging resistance all decreased. It is proved that only the polypropylene prepared under the specific raw materials and ratios of this application can significantly improve its flame retardancy, high temperature resistance, yellowing resistance, and aging resistance while maintaining good mechanical properties.

[0092] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than a limitation on the protection scope of the present invention. Any simple modification or equivalent replacement of the technical solution of the present invention by those of ordinary skill in the art does not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A polypropylene material containing recycled materials and resistant to aging, characterized in that: The invention comprises the following raw materials: recycled polypropylene material, composite flame retardant, high temperature resistant color powder, compatibilizer and antioxidant; wherein the composite flame retardant comprises aluminum hydroxide, styrene-methyl methacrylate block copolymer and SiC.

2. The polypropylene material according to claim 1, characterized in that: The polypropylene material comprises the following components, calculated by weight: 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.

3. The polypropylene material according to claim 1, characterized in that: The mass ratio of the aluminum hydroxide, styrene-methyl methacrylate block copolymer and SiC is 20-40:1-4:4-10.

4. The polypropylene material according to claim 1, characterized in that: The particle size of the aluminum hydroxide is 100-150 μm; the particle size of the SiC is 100-500 μm.

5. The polypropylene material according to claim 1, characterized in that: The high temperature resistant toner is modified carbon black, the modified carbon black is spray carbon black wrapped 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.

6. The polypropylene material according to claim 1, characterized in that: The compatibilizer is an oxazoline type compatibilizer, and the oxazoline type compatibilizer is PRS-1005, and the grafting rate is 0.8%-1.2%.

7. The polypropylene material according to claim 1, characterized in that: 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.

8. 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 material, automobile interior recycled material, paint bucket recycled material or bottle cap recycled material.

9. The method for preparing the polypropylene material according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: mixing the raw materials of the polypropylene material and melt-extruding the raw materials.

10. Use of the polypropylene material according to any one of claims 1 to 8 in the preparation of automobile interior decoration and / or electric vehicle accessory materials.

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