Polypropylene composition as well as preparation method and application thereof

Abstract

The invention discloses a polypropylene composition as well as a preparation method and application thereof. The polypropylene composition is prepared from the following components in parts by weight: 49 to 88 parts of polypropylene, 5 to 20 parts of ethylene-octylene random copolymer, 1 to 5 parts of surface improver, 1 to 2 parts of scratch-resistant agent, 0.2 to 1.5 parts of scratch-resistant synergist and 5 to 20 parts of filler, the surface improver is an ethylene-propylene polyolefin elastomer; the scratch-resistant agent is a silicone scratch-resistant agent; and the scratch-resistant synergist is boron nitride. The polypropylene composition has no bad appearance and has excellent scratch resistance; and the injection molding period is short, and the requirement that the injection molding time is shorter and shorter can be met.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of plastics, and more particularly relates to a polypropylene composition and a preparation method and application thereof. BACKGROUND

[0002] Polypropylene is widely used in automobiles due to its small density, high cost performance, excellent heat resistance, rigidity, chemical corrosion resistance, easy processing and molding, and recycling, and has become the largest and fastest-growing variety of plastics used in automobiles.

[0003] In the process of using polypropylene to modify and apply to automobile interior and exterior parts, a toughening agent ethylene-octene random copolymer is mostly used in the formula system of polypropylene to modify the polypropylene. The ethylene-octene random copolymer can significantly improve the low-temperature impact toughness of the polypropylene and reduce the risk of brittle fracture. At present, the injection molding time of polypropylene matrix injection molding for preparing automobile interior and exterior parts is usually 80-90 s, however, in actual production, the injection molding time is often shortened (shortened to 60-70 s or less) to improve production efficiency. However, due to the relatively poor compatibility between the ethylene-octene random copolymer and the polypropylene, the injection molded part will have surface appearance problems (such as air marks, ghosting and other abnormal appearance problems) during injection molding (especially when the injection molding cycle is shortened); in addition, due to the poor compatibility, the components in the system are dispersed poorly, further affecting the scratch resistance of the polypropylene modified material. SUMMARY

[0004] In view of the above technical problems of the prior art, the primary object of the present application is to provide a polypropylene composition having a high-quality appearance surface, no appearance defects, and excellent scratch resistance; in addition, the injection molding cycle is shorter.

[0005] The second object of the present application is to provide a preparation method of the polypropylene composition.

[0006] The third object of the present application is to provide an application of the polypropylene composition in automobile parts.

[0007] The fourth object of the present application is to provide an instrument panel.

[0008] In order to achieve the above objects, the present application is implemented by the following technical solutions: The present application claims a polypropylene composition, comprising the following components by weight fraction: polypropylene 49-88 parts, ethylene-octene random copolymer 5-20 parts, surface modifier 1-5 parts, scratch-resistant agent 1-2 parts, scratch-resistant synergist 0.2-1.5 parts, and filler 5-20 parts; The surface modifier is an ethylene-propylene polyolefin elastomer; The scratch-resistant agent is a silicone-based scratch-resistant agent. The scratch-resistant synergist is boron nitride.

[0009] The ethylene-propylene polyolefin elastomer as the surface improver can significantly improve the uniformity of the polypropylene and ethylene-octene random copolymer system based on the similar compatibility principle, and can play an excellent surface improvement role, thereby improving the appearance and scratch resistance of the polypropylene composition. Further, the silicone-based scratch-resistant agent and boron nitride are used in combination in the present application, the silicone-based scratch-resistant agent can migrate to the surface of the material to form a lubricating film; in addition, compared with other lubricants, the silicone-based scratch-resistant agent can significantly improve the dispersibility of boron nitride in the polypropylene system, thereby effectively improving the appearance and scratch resistance of the polypropylene composition.

[0010] The ethylene-propylene polyolefin elastomer as the surface improver, the silicone-based scratch-resistant agent and boron nitride are used in combination, and the ethylene-octene random copolymer, filler and other components in the system, which significantly improves the appearance of the polypropylene composition, has no appearance defect, has excellent scratch resistance, and has a shorter injection molding cycle, which can meet the requirement of shorter and shorter injection molding time, and improve the production efficiency.

[0011] Specifically, the polypropylene can be 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 87 parts, etc., or an interval range formed by any of the above values, such as 50-70 parts, 55-80 parts, and the present application is not limited thereto. Specifically, the filler can be 7 parts, 9 parts, 11 parts, 13 parts, 15 parts, 17 parts, 19 parts, etc., or an interval range formed by any of the above values, such as 11-15 parts, 7-15 parts, and the present application is not limited thereto. Specifically, the ethylene-octene random copolymer can be 7 parts, 9 parts, 11 parts, 13 parts, 15 parts, 17 parts, 19 parts, etc., or an interval range formed by any of the above values, such as 11-15 parts, 7-17 parts, and the present application is not limited thereto. Specifically, the surface improver can be 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, etc., or an interval range formed by any of the above values, such as 1.5-2.5 parts, 3-4 parts, and the present application is not limited thereto. Specifically, the scratch-resistant agent can be 1.2 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.8 parts, 2 parts, etc., or an interval range formed by any of the above values, such as 2.5-3.2 parts, 3-3.8 parts, and the present application is not limited thereto. Specifically, the scratch-resistant synergist can be 0.5 parts, 0.7 parts, 0.9 parts, 1.1 parts, 1.3 parts, etc., or an interval range formed by any of the above values, such as 0.5-1.3 parts, 0.7-1.5 parts, and the present application is not limited thereto.

[0012] Specifically, in the present application, the polypropylene accounts for not less than 49.2% of the mass percentage of the polypropylene composite. Preferably, the polypropylene accounts for 60-75% of the mass percentage of the polypropylene composite. Further preferably, the polypropylene accounts for 65.4-72.5% of the mass percentage of the polypropylene composite.

[0013] Specifically, the D50 particle size of the boron nitride is 80 nm-3 μm. Further preferably, the D50 particle size of the boron nitride is 90 nm-500 nm. More preferably, the D50 particle size of the boron nitride is 90 nm-200 nm. Specifically, the D50 particle size of the boron nitride can be 85 nm, 90 nm, 95 nm, 100 nm, 110 nm, 120 nm, 150 nm, 200 nm, 400 nm, 600 nm, 800 nm, 1000 nm, 1500 nm, 2000 nm, 2500 nm, etc., or an interval range formed by any of the above values, and the present application is not limited thereto.

[0014] Preferably, the boron nitride accounts for 0.2-2% of the mass percentage of the above polypropylene composition.

[0015] Specifically, the silicone-based scratch-resistant agent can be directly added or added in the form of a master batch. When added in the form of a master batch, the carrier resin can be selected from polypropylene or low-density polyethylene, and the effective content of polysiloxane in the master batch can be selected from 40-55%; it can be further selected from 48-52%; and the polysiloxane can be selected from polydimethylsiloxane.

[0016] Preferably, the polypropylene is selected from at least one of the following (a) to (c): (a) the polypropylene is a binary block copolymer polypropylene synthesized from ethylene and propylene; (b) the melt flow rate of the polypropylene at 230℃ under a load of 2.16 kg is 20-60 g / 10 min; (c) the content of ethylene in the polypropylene is 5-20 wt%.

[0017] Specifically, the melt flow rate of the polypropylene at 230℃ and 2.16 kg is 27-60 g / 10 min. More specifically, the melt flow rate of the polypropylene at 230℃ and 2.16 kg can be 25 g / 10 min, 27 g / 10 min, 30 g / 10 min, 35 g / 10 min, 40 g / 10 min, 45 g / 10 min, 50 g / 10 min, 55 g / 10 min, etc., or any range formed by the above values, such as 30-50 g / 10 min, 27-55 g / 10 min; the present invention is not limited thereto. Specifically, the test method for the melt flow rate of the polypropylene is GB / T 3682.1-2018.

[0018] Preferably, the polypropylene has a melt flow rate of 50-60 g / 10 min at 230°C and 2.16 kg. This preferred setting improves the scratch resistance of the polypropylene composition.

[0019] Specifically, the ethylene content in the polypropylene is 5.5-13.5 wt%. Specifically, the ethylene content in the polypropylene can be 7 wt%, 9 wt%, 11 wt%, 13 wt%, 15 wt%, 17 wt%, 19 wt%, etc., or any range formed by the above values, such as 5.5-10 wt%, 11-13.5 wt%, etc., and the present invention is not limited thereto.

[0020] Preferably, the ethylene-propylene polyolefin elastomer is selected from at least one of the following (d) to (e): (d) The melt flow rate of the ethylene-propylene polyolefin elastomer at 190°C and 2.16 kg is 0.5-10 g / 10 min; (e) The ethylene content in the ethylene-propylene polyolefin elastomer is 15-40 wt%.

[0021] Specifically, the melt flow rate of the ethylene-propylene polyolefin elastomer at 190°C and 2.16 kg is 1.3-7.4 g / 10 min. More specifically, the melt flow rate of the ethylene-propylene polyolefin elastomer at 190°C and 2.16 kg can be 1 g / 10 min, 3 g / 10 min, 5 g / 10 min, 7 g / 10 min, 9 g / 10 min, etc., or any range formed by the above values, such as 0.5-5 g / 10 min, 1.3-7 g / 10 min; the present invention is not limited thereto. Specifically, the test method for the melt flow rate of the ethylene-propylene polyolefin elastomer is GB / T 3682.1-2018.

[0022] Preferably, the melt flow rate of the ethylene-propylene polyolefin elastomer under the condition of 190℃, 2.16kg is 5-7.4g / 10min. In this preferred embodiment, the scratch resistance of the polypropylene composition can be improved better.

[0023] Specifically, the content of ethylene in the ethylene-propylene polyolefin elastomer can be 20wt%, 25wt%, 30wt%, 35wt% or any interval range formed by the above-mentioned values, such as 15-20wt%, 16-30wt%, and the present application is not limited thereto. Specifically, the content of ethylene in the ethylene-propylene polyolefin elastomer is 15-16wt%.

[0024] Preferably, the ethylene-propylene polyolefin elastomer accounts for 1-5% of the mass percentage of the above-mentioned polypropylene composition.

[0025] Preferably, the melt flow rate of the ethylene-octene random copolymer under the condition of 190℃, 2.16kg is 0.5-20g / 10min. Further preferably, the melt flow rate of the ethylene-octene random copolymer under the condition of 190℃, 2.16kg is 1-5g / 10min. The melt flow rate of the ethylene-octene random copolymer can be 1g / 10min, 3g / 10min, 5g / 10min, 8g / 10min, 10g / 10min, 13g / 10min, 15g / 10min, 18g / 10min or any interval range formed by the above-mentioned values, such as 1-10g / 10min, 2-15g / 10min, and the present application is not limited thereto. Specifically, the test method of the melt flow rate of the ethylene-octene random copolymer is ISO 1133.

[0026] Preferably, the filler is selected from at least one of basic magnesium sulfate whisker, talcum powder, calcium carbonate.

[0027] Preferably, the filler is at least one of talcum powder and calcium carbonate; the D50 particle size of the filler is ≤6μm. More specifically, the D50 particle size of the filler is 3-6μm. Specifically, the test method of the D50 particle size of the filler is GB / T19077.1-2008.

[0028] Preferably, the filler is talcum powder. In this preferred embodiment, the scratch resistance of the polypropylene composition can be improved better.

[0029] Preferably, the diameter of the basic magnesium sulfate whisker is ≤ 3 μm. Further preferably, the diameter of the basic magnesium sulfate whisker is 1-3 μm. Preferably, the length of the basic magnesium sulfate whisker is ≥ 25 μm. Further preferably, the length of the basic magnesium sulfate whisker is 25-45 μm. More particularly, the testing method of the diameter and length of the basic magnesium sulfate whisker is HG / T 6318-2024.

[0030] Preferably, the polypropylene composition further comprises at least one of a lubricant, a light stabilizer, an antioxidant.

[0031] Preferably, at least one of the following (f) to (h) is selected: (f) the lubricant is selected from at least one of an amide lubricant, a stearic acid lubricant, a stearate lubricant; (g) the antioxidant is selected from at least one of a hindered phenol antioxidant, a phosphite antioxidant; (h) the light stabilizer is a hindered amine antioxidant.

[0032] Specifically, the lubricant includes but is not limited to oleic acid amide, erucic acid amide, ethylene bis-stearamide, aryl amide sodium fatty acid, stearic acid, calcium stearate, zinc stearate, etc.

[0033] Specifically, the antioxidant includes but is not limited to tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester, triethylene glycol ether-di(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 2,2'-methylenebis(4-methyl-6-tert-butylphenol), tris(2,4-di-tert-butylphenyl)phosphite, bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite, tris(nonylphenyl)phosphite, etc.

[0034] Specifically, the light stabilizer includes but is not limited to bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, poly-{[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl]-[(2,2,6,6-tetramethyl-4-piperidyl)imino]-1,6-hexanediyl}, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidyl) sebacate, etc.

[0035] Preferably, the polypropylene composition comprises, in terms of weight fraction: 0-1 parts of a lubricant; further preferably, the polypropylene composition comprises: 0.1-0.3 parts of a lubricant.

[0036] Preferably, the polypropylene composition comprises: light stabilizer 0-1 parts by weight; further preferably, the polypropylene composition comprises: light stabilizer 0.1-0.3 parts by weight.

[0037] Preferably, the polypropylene composition comprises: antioxidant 0-1 parts by weight; further preferably, the polypropylene composition comprises: antioxidant 0.2-0.6 parts by weight.

[0038] Further, the present application claims a preparation method of the polypropylene composition, wherein the raw materials are mixed uniformly, and then melt-extruded to obtain the polypropylene composition.

[0039] Preferably, the temperature of melt-extrusion is 170-220℃.

[0040] Preferably, the melt-extrusion is performed by using a double-screw extruder. More specifically, the length-diameter ratio of the double-screw extruder is: 42-62:1.

[0041] Preferably, the vacuum degree during melt-extrusion is controlled to be ≤-0.08MPa.

[0042] Further, the present application claims the application of the polypropylene composition in automobile parts.

[0043] Further, the present application claims an instrument panel prepared by using the above polypropylene composition.

[0044] Compared with the prior art, the present application has the following beneficial effects: The present application provides a polypropylene composition, which has a high-quality appearance surface, no appearance defects, and excellent scratch resistance; in addition, the polypropylene composition can meet the requirement of short injection molding cycle time, and improve the production efficiency. DETAILED DESCRIPTION

[0045] The present application is further illustrated in the following description and specific examples, but the examples do not limit the present application in any form. Unless otherwise specified, the reagents, methods and devices used in the present application are conventional reagents, methods and devices in the technical field.

[0046] Polypropylene 1, a binary block copolymer polypropylene synthesized by ethylene and propylene, the ethylene content is 5.5wt%, the melt flow rate under the condition of 230℃ and 2.16kg is 60g / 10min, BI871, Hanwha Dow.

[0047] Polypropylene 2, a binary block copolymer polypropylene synthesized by ethylene and propylene, the ethylene content is 13.5wt%, the melt flow rate under the condition of 230℃ and 2.16kg is 27g / 10min, EP240R, Sinopec Shell.

[0048] Toughener 1, ethylene-octene random copolymer, Engage 8842, Dow Chemical.

[0049] Toughener 2, ethylene-octene random copolymer, Engage 8200, Dow Chemical.

[0050] Surface modifier 1, ethylene-propylene polyolefin elastomer, melt flow rate at 190℃, 2.16kg condition is 1.3g / 10min, ethylene content is 16wt%, Vistamaxx 6102, Exxon Mobil.

[0051] Surface modifier 2, ethylene-propylene polyolefin elastomer, melt flow rate at 190℃, 2.16kg condition is 9.1g / 10min, ethylene content is 15wt%, Vistamaxx 6202, Exxon Mobil.

[0052] Surface modifier 3, maleic anhydride grafted polypropylene, PC-1, Nanhai Baimen New Material Co., Ltd.

[0053] Filler 1, talcum powder, D50 particle size is 6μm, TYT-777A, Liaoning Tianyuan.

[0054] Filler 2, basic magnesium sulfate whisker, WS1-S2, Yingkou Weiske Chemical.

[0055] Filler 3, heavy calcium carbonate, particle size D50=6μm, Guangxi Xincail Mineral Industry.

[0056] Scratch resistance agent 1, silicone-based scratch resistance agent, polysiloxane effective content is 50%, AS-025, Shanghai Hanyuan New Material Co., Ltd.

[0057] Scratch resistance agent 2, silicone-based scratch resistance agent, polysiloxane effective content is 50%, BZPP301, Chongqing Baozun New Material Technology Co., Ltd.

[0058] Scratch resistance agent 3, amide-based scratch resistance agent, erucic acid amide, Tunan New Material Co., Ltd.

[0059] Scratch resistance agent 4, amide-based scratch resistance agent, oleic acid amide, Tunan New Material Co., Ltd.

[0060] Scratch resistance synergist 1, boron nitride, XH-BN-100, Shanghai Xiaohua Nanometer Technology Co., Ltd.

[0061] Antioxidant 1, hindered phenol antioxidant, antioxidant 1010, commercially available.

[0062] Antioxidant 2, phosphite antioxidant, antioxidant 168, commercially available.

[0063] Light stabilizer, UV-3808PP5, Solvay, Belgium.

[0064] Lubricant 1, amide lubricant, TR451, STRUKTOL, USA.

[0065] Lubricant 2, calcium stearate, commercially available.

[0066] Lubricant 3, zinc stearate, commercially available.

[0067] Unless otherwise specified, each component (such as antioxidant, light stabilizer) used in each parallel example and comparative example is the same commercially available product.

[0068] Examples 1-12 A polypropylene composition was prepared according to the formulation in Table 1-2 in parts by weight, and a preparation method comprising the following steps: first, mixing other components except for the filler in a high-speed mixer for 4 minutes (at a speed of 250 rpm), then adding the filler into the high-speed mixer for 4 minutes (at a speed of 250 rpm), and then adding the mixture into a twin-screw extruder (length-diameter ratio: 48:1) for melt extrusion, granulation, and drying to obtain the polypropylene composition. The temperature of the twin-screw extruder was 170℃, 200℃, 200℃, 210℃, 210℃, 205℃, 205℃, 205℃, 200℃, and 200℃ from the feeding section to the die head, respectively. The extrusion was performed by a double vacuum process with a vacuum degree of ≤-0.08 MPa.

[0069] The amount of the scratch-resistant agent in Table 1-3 has been converted into the amount of pure polysiloxane.

[0070] Table 1

[0071] Table 2

[0072] Comparative Examples 1-6 The amount of each raw material used in each of the following comparative examples is shown in Table 3. The preparation method was the same as that of Example 1.

[0073] Table 3

[0074] Test Examples The polypropylene composite material obtained in the above examples and comparative examples was injection molded into an injection molded part, and the following tests were performed.

[0075] (1) Appearance test: Visually inspect the surface of the parts to see how many appearance defects there are. Appearance defects are defined as at least one of the following: air marks or ghosting. The classification of appearance defects is shown in Table 4 below.

[0076] (2) Scratch resistance test: The scratch resistance evaluation refers to Volkswagen's PV3952 standard. The test method is as follows: A 1 mm diameter scratch head is used to scratch the sample horizontally and vertically under a 10 N load to form a grid of scratches. The instrument automatically guides the scratch head to move at a speed of 1000 mm / min. The scratch spacing is 2 mm and the length is 40 mm. At least 20 scratches are made in one direction. Then the sample is rotated 90 degrees and the above process is repeated in the vertical direction to form a grid of scratches.

[0077] Scratch resistance is evaluated by testing the color difference change in the area before and after a grid scratch, with the degree of whitening used to characterize the material's scratch resistance. The L values ​​(reflecting color depth) before and after scratching are measured using a colorimeter, and ΔL is calculated as: L value after scratch - L value before scratching. A larger ΔL value indicates more pronounced whitening after scratching and poorer scratch resistance.

[0078] (3) Molding cycle: The molding time of injection molding polypropylene composite material into a 150*150*3mm square plate injection molded part.

[0079] The test results are shown in Tables 5 and 6 below.

[0080] Table 4

[0081] Table 5

[0082] Table 6

[0083] As shown in Tables 5 and 6 above, the polypropylene composition provided by this invention has a high-quality surface finish, no appearance defects, and excellent scratch resistance; furthermore, the injection molding cycle is shorter. More specifically, the appearance grade of the polypropylene composition provided by this invention is ≤ Grade 1, and ΔL ≤ 0.41, with a molding cycle of ≤ 46s.

[0084] As can be seen from Examples 2, 5, and 7, polypropylene resin or ethylene-propylene polyolefin elastomer has a higher melt flow rate, which can better improve scratch resistance.

[0085] As can be seen from Examples 2 and Comparative Examples 1-3, it is difficult to achieve the technical effect of the present invention when the polypropylene system lacks surface improvers or scratch synergists; and surface improvers and scratch synergists have a synergistic effect on improving the scratch resistance of polypropylene compositions.

[0086] From Example 2, Comparative Example 4, it can be seen that using maleic anhydride grafted polypropylene, which is commonly used in the art, as a surface modifier cannot achieve the technical effects of the present application, the appearance is seriously poor, the scratch resistance is poor, and the molding cycle is longer.

[0087] From Example 2, Comparative Example 5 and Comparative Example 6, it can be seen that in the system of the present application, a specific scratch-resistant agent and boron nitride need to be used in combination to achieve the technical effects of the present application.

[0088] The foregoing examples are illustrative only and are not meant to limit the scope of the application as described in the claims. The claims appended hereto are intended to embrace the broadest reasonable interpretation of the technical features of the methods described herein. The examples presented herein are intended to demonstrate the application of the principles of the application and are not meant to limit the scope of the claims appended hereto. Thus, the claims appended hereto are not intended to be limited by the selection of examples that illustrate some of the features of the methods described herein. Some numerical ranges are presented herein in a range format. It is to be understood that such ranges are only approximations. Thus, embodiments falling outside of a recited range, when such embodiments are within the claims, are contemplated to be within the scope of the application.

Claims

1. A polypropylene composition, characterized in that, By weight, it includes the following components: 49-88 parts polypropylene, 5-20 parts ethylene-octene random copolymer, 1-5 parts surface improver, 1-2 parts scratch resistant agent, 0.2-1.5 parts scratch resistant synergist, and 5-20 parts filler. The surface improver is an ethylene-propylene polyolefin elastomer; The scratch-resistant agent is a silicone-based scratch-resistant agent; The scratch-resistant synergist is boron nitride.

2. The polypropylene composition according to claim 1, characterized in that, The polypropylene is selected from at least one of (a) to (c): (a) The polypropylene is a binary block copolymer polypropylene synthesized from ethylene and propylene; (b) The melt flow rate of the polypropylene at 230°C and 2.16 kg is 20-60 g / 10 min; (c) The ethylene content in the polypropylene is 5-20 wt%.

3. The polypropylene composition according to claim 1, characterized in that, The ethylene-propylene polyolefin elastomer is selected from at least one of the following (d) to (e): (d) The melt flow rate of the ethylene-propylene polyolefin elastomer at 190°C and 2.16 kg is 0.5-10 g / 10 min; (e) The ethylene content in the ethylene-propylene polyolefin elastomer is 15-40 wt%.

4. The polypropylene composition according to claim 1, characterized in that, The filler is selected from at least one of basic magnesium sulfate whiskers, talc, and calcium carbonate.

5. The polypropylene composition according to claim 1 or 4, characterized in that, The filler is at least one of talc and calcium carbonate; the D50 particle size of the filler is ≤6μm.

6. The polypropylene composition according to claim 1, characterized in that, The polypropylene composition further includes at least one of a lubricant, a light stabilizer, and an antioxidant.

7. The polypropylene composition according to claim 6, characterized in that, Selected from at least one of the following (f) to (h): (f) The lubricant is selected from at least one of amide lubricants, stearic acid lubricants, and stearate lubricants; (g) The antioxidant is selected from at least one of hindered phenolic antioxidants and phosphite antioxidants; (h) The light stabilizer is a hindered amine antioxidant.

8. A method for preparing the polypropylene composition according to any one of claims 1-7, characterized in that, After the raw materials are mixed evenly, they are melt-extruded to prepare the polypropylene composition.

9. The use of the polypropylene composition according to any one of claims 1-7 in automotive parts.

10. An instrument panel, characterized in that, It is prepared using the polypropylene composition according to any one of claims 1-7.

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