Polypropylene composite material as well as preparation method and application thereof

Abstract

The invention discloses a polypropylene composite material as well as a preparation method and application thereof. The polypropylene composite material is prepared from the following components in parts by weight: 30 to 80 parts of polypropylene, 5 to 30 parts of POE (Polyolefin Elastomer) resin, 10 to 20 parts of polar modified polyolefin, 0.5 to 2.5 parts of polyethylene glycol and 5 to 10 parts of hollow glass beads, wherein the hollow glass beads comprise first hollow glass beads and second hollow glass beads, and the particle size D1n50 of the first hollow glass beads and the particle size D2n50 of the second hollow glass beads meet the condition that D1n50 / D2n50 is greater than or equal to 1.2. The polypropylene composite material provided by the invention has low gloss and boiling foaming resistance.

Description

Technical Field

[0001] This invention belongs to the technical field of plastics, and more specifically, relates to a polypropylene composite material, its preparation method, and its application. Background Technology

[0002] Polypropylene is widely used in automobiles due to its low density, high cost-effectiveness, excellent heat resistance, rigidity, resistance to chemical corrosion, and ease of processing, molding, and recycling. It has become the most widely used and fastest-growing type of plastic in the automotive industry.

[0003] When polypropylene is used in automotive interiors, certain performance requirements apply, such as: (1) to reduce light interference with the human eye and alleviate visual fatigue, polypropylene needs to have a low gloss level; (2) the surface properties of polypropylene itself are poor, requiring surface painting. After painting, the weather resistance of the interface between the surface coating and the polypropylene substrate will affect the service life of the material, especially its resistance to boiling and foaming. Therefore, it is necessary to develop a polypropylene composite material that combines low gloss and resistance to boiling and foaming. Summary of the Invention

[0004] In view of the above-mentioned existing technical problems, the primary objective of the present invention is to provide a polypropylene composite material having low gloss properties and resistance to water boiling and foaming.

[0005] The second objective of this invention is to provide a method for preparing a polypropylene composite material.

[0006] The third objective of this invention is to provide an application of polypropylene composite materials in automotive parts.

[0007] A fourth objective of this invention is to provide an automotive interior and exterior trim component with a surface coating.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solution: This invention claims protection for a polypropylene composite material, comprising, by weight, the following components: 30-80 parts polypropylene, 5-30 parts POE resin, 10-20 parts polar modified polyolefin, 0.5-2.5 parts polyethylene glycol, and 5-10 parts hollow glass microspheres; wherein the hollow glass microspheres include first hollow glass microspheres and second hollow glass microspheres, and the particle size D1n50 of the first hollow glass microspheres and the particle size D2n50 of the second hollow glass microspheres satisfy: D1n50 / D2n50≥1.2.

[0009] This invention provides a polypropylene composite material in which polyethylene glycol can be enriched on the polypropylene surface and form microspheres, promoting a rough surface morphology. This not only improves the scattering of light on the material surface, resulting in a low-gloss characteristic, but also creates a certain degree of surface roughness. Furthermore, it can form a mechanical interlock with the surface coating, improving the adhesion performance with the surface paint film coating. However, due to the presence of terminal hydroxyl groups in polyethylene glycol, it readily absorbs moisture from the air, leading to a reduction in the bonding force between the polypropylene substrate and the surface coating, thus affecting the service life of the material.

[0010] To further improve the adhesion between the polypropylene substrate and the surface coating, this invention adds polar modified polyolefins. The polar groups can have a higher adhesion to the surface coating, improving the short service life caused by the hydrolysis of polyethylene glycol. However, the presence of polar groups will interact with the hydroxyl groups in polyethylene glycol, affecting the enrichment and sphericity of polyethylene glycol on the polypropylene surface, thereby reducing the roughness of the polypropylene surface, reducing light scattering, and affecting the surface gloss.

[0011] Further research by the inventors revealed that when hollow glass microspheres of different sizes are added to the above system, and the ratio of larger to smaller hollow glass microspheres satisfies D1n50 / D2n50 ≥ 1.2, the dispersion performance of each component in the matrix can be significantly improved, thereby enabling polypropylene to possess both low gloss and high-temperature water-boiling resistance. Specifically, the relatively smaller hollow glass microspheres can disperse within the polypropylene matrix and also act as nucleating agents, promoting rapid crystallization of polypropylene and reducing the impact of polar modified polyolefin resins on the surface enrichment and sphericity of polyethylene glycol. Meanwhile, the relatively larger hollow glass microspheres can rapidly migrate to the polypropylene surface, further enhancing surface roughness.

[0012] This invention significantly improves the low-gloss properties and water-boiling foam resistance of polypropylene materials by adding polyethylene glycol, polar modified polyolefin, and hollow glass microspheres of two different particle sizes to a polypropylene matrix.

[0013] Specifically, in some embodiments, the polypropylene composite material comprises, by weight, the following components: 32.5-79.5 parts polypropylene, 5-30 parts POE resin, 10-20 parts polar modified polyolefin, 0.5-2.5 parts polyethylene glycol, and 5-10 parts hollow glass microspheres. Preferably, the polypropylene composite material comprises, by weight, the following components: 54.5-71 parts polypropylene, 10-20 parts POE resin, 12-16 parts polar modified polyolefin, 1-1.5 parts polyethylene glycol, and 6-8 parts hollow glass microspheres.

[0014] Specifically, the number of parts of polypropylene can be 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, etc., or any range formed by the above values, such as 35-70 parts, 40-80 parts, etc., and the present invention is not limited thereto. Specifically, the number of parts of POE resin can be 8 parts, 12 parts, 16 parts, 20 parts, 24 parts, 28 parts, etc., or any range formed by the above values, such as 10-20 parts, 16-24 parts, etc., and the present invention is not limited thereto. Specifically, the number of parts of polar modified polyolefin can be 12 parts, 14 parts, 16 parts, 18 parts, etc., or any range formed by the above values, such as 14-16 parts, 12-20 parts, etc., and the present invention is not limited thereto. Specifically, the amount of polyethylene glycol can be 0.8 parts, 1.2 parts, 1.8 parts, 2 parts, 2.3 parts, etc., such as 0.5-1 parts, 1-2 parts, etc., or any range formed by the above values; the present invention is not limited thereto. The amount of hollow glass microspheres can be 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts, etc., or any range formed by the above values, such as 5-8.5 parts, 7-9 parts, etc.; the present invention is not limited thereto.

[0015] Specifically, in this invention, polypropylene accounts for no less than 32.4% of the mass of the polypropylene composite material.

[0016] Preferably, in this invention, the POE resin accounts for 3-35% of the mass percentage of the polypropylene composite material; more preferably, the POE resin accounts for 5-30% of the mass percentage of the polypropylene composite material.

[0017] Preferably, in this invention, the mass percentage of polyethylene glycol in the polypropylene composite material ranges from 0.3% to 3%; more preferably, the mass percentage of polyethylene glycol in the polypropylene composite material ranges from 0.5% to 2.5%.

[0018] Preferably, in this invention, the hollow glass microspheres account for 3-12% of the mass percentage of the polypropylene composite material; more preferably, the polyethylene glycol accounts for 5-10% of the mass percentage of the polypropylene composite material.

[0019] Preferably, the melt flow rate of the POE resin at 190°C and 2.16 kg is 0.5-13 g / 10 min. The melt flow rate of the POE resin is tested according to the ASTM D-1238-2013 test standard. Specifically, the melt flow rate of the POE resin at 190°C and 2.16 kg can be 1.5 g / 10 min, 3 g / 10 min, 4.5 g / 10 min, 6 g / 10 min, 7.5 g / 10 min, 9 g / 10 min, 10.5 g / 10 min, 12 g / 10 min, etc., or any range formed by the above values, and the present invention is not limited thereto.

[0020] Preferably, the melt flow rate of the POE resin at 190°C and 2.16 kg is 0.5-5 g / 10 min; more preferably, the melt flow rate of the POE resin at 190°C and 2.16 kg is 3.6-5 g / 10 min. When the flowability of the POE resin is within the above range, it can interact with polyethylene glycol to improve the surface roughness of polypropylene. If the flowability of POE is too high, the tensile orientation of POE becomes significant, leading to an increase in the gloss of the polypropylene material surface.

[0021] Preferably, the polar modified polyolefin is a polar monomer-grafted polyolefin, which is obtained by grafting a polar monomer onto a polyolefin; the polar monomer is at least one of acid anhydride monomers, acrylic monomers, and acrylate monomers that can polymerize with double bonds; the polyolefin is at least one of polyethylene, polypropylene, ethylene-butene copolymer, ethylene-hexene copolymer, ethylene-octene copolymer, ethylene-propylene-butadiene terpolymer, and ethylene-acrylate copolymer.

[0022] Preferably, the acrylic monomer can be acrylic acid and / or methacrylic acid. The acrylate monomer can be at least one of methyl acrylate, ethyl acrylate, methyl methacrylate, and glycidyl methacrylate. The double-bond polymerizable anhydride monomer can be at least one of maleic anhydride, fumaric anhydride, itaconic anhydride, citraconic anhydride, and vinylsuccinic anhydride.

[0023] Specifically, in the polar modified polyolefin, the grafting rate of polar monomers is 0.5-3%. More specifically, the test method for the grafting rate of polar monomers (such as maleic anhydride or acrylate) in the polar modified polyolefin is: acid-base titration or infrared testing.

[0024] Preferably, the weight-average molecular weight of the polyethylene glycol is 150-1000 g / mol. Polyethylene glycol can be combined with POE resin to prepare polypropylene composite materials that simultaneously possess high surface roughness and low gloss without affecting the material's inherent physical properties (such as impact strength and flexural modulus), making them widely applicable in the manufacture of automotive interior and exterior parts. The method for testing the weight-average molecular weight of the polyethylene glycol is ISO 13885:2020.

[0025] More preferably, the polyethylene glycol has a weight-average molecular weight of 200-600 g / mol. Polyethylene glycol with a specific weight-average molecular weight exhibits good dispersion in the polypropylene matrix. Furthermore, in the aforementioned low-molecular-weight polyethylene glycol, the proportion of terminal hydroxyl groups in the overall molecule is relatively high, making it easier for polyethylene glycol to form microspheres after enrichment on the material surface. This allows polyethylene glycol to improve the surface roughness of the polypropylene composite material.

[0026] Specifically, the particle size Dn50 (such as D1n50, D2n50) of the hollow glass microspheres refers to the particle size corresponding to a cumulative distribution percentage of 50% for the hollow glass microspheres. The particle size Dn50 of the hollow glass microspheres is determined by dispersing the hollow glass microspheres in water and testing them using a Malvern particle size analyzer. Specifically, the particle size Dn90 of the hollow glass microspheres refers to the particle size corresponding to a cumulative distribution percentage of 90% for the hollow glass microspheres. The particle size Dn90 of the hollow glass microspheres is determined by dispersing the hollow glass microspheres in water and testing them using a Malvern particle size analyzer.

[0027] Preferably, the particle size D1n50 of the first hollow glass microspheres and the particle size D2n50 of the second hollow glass microspheres satisfy the following ratio: D1n50 / D2n50 is 1.2-2.5. More preferably, it satisfies the following ratio: D1n50 / D2n50 is 1.4-2.5. More preferably, it satisfies the following ratio: D1n50 / D2n50 is 1.5-2.0; under this preferred ratio, the prepared polypropylene composite material has a lower gloss.

[0028] Preferably, the particle size D1n50 of the first hollow glass microspheres is ≤40 μm, and the particle size D2n50 of the second hollow glass microspheres is ≤40 μm. More preferably, the particle size D1n50 of the first hollow glass microspheres is ≤35 μm, and the particle size D2n50 of the second hollow glass microspheres is ≤35 μm.

[0029] More preferably, the particle size D1n50 of the first hollow glass microspheres is 10-35 μm, and the particle size D2n50 of the second hollow glass microspheres is 10-35 μm. Hollow glass microspheres with a suitable particle size Dn50 can reduce the interface between the hollow glass microspheres and polypropylene, thereby improving the mechanical properties of polypropylene.

[0030] Preferably, the ratio of Dn90 to Dn50 in the first hollow glass microspheres is 1.375-1.857. More preferably, the ratio of Dn90 to Dn50 is 1.5-1.6.

[0031] Specifically, in one embodiment, the particle size of the first hollow glass microspheres is D1n90≤70μm, and the particle size of the second hollow glass microspheres is D2n90≤70μm.

[0032] Preferably, the weight ratio of the first hollow glass microspheres to the second hollow glass microspheres is 1-2:1. More specifically, the weight ratio of the first hollow glass microspheres to the second hollow glass microspheres is 1-1.5:1. More specifically, the weight ratio of the first hollow glass microspheres to the second hollow glass microspheres is 1.22-1.5:1.

[0033] Preferably, the melt flow rate of the polypropylene at 230°C and 2.16 kg is 10-100 g / 10 min. More preferably, the melt flow rate of the polypropylene at 230°C and 2.16 kg is 10-60 g / 10 min. When the melt flow rate of the polypropylene is within this range, the polypropylene composite material system has good fluidity, which is beneficial to the uniform mixing of the raw material components. The melt flow rate of the polypropylene is determined according to the standard method ISO 1133-1:2011.

[0034] Specifically, the melt flow rate of the polypropylene can be 10 g / 10 min, 15 g / 10 min, 20 g / 10 min, 25 g / 10 min, 30 g / 10 min, 35 g / 10 min, 60 g / 10 min, 100 g / 10 min, or any range formed by the above values, such as 10-20 g / 10 min, 25-35 g / 10 min, etc., but is not limited thereto.

[0035] Preferably, the polypropylene is selected from at least one of homopolymer polypropylene, random copolymer polypropylene, and block copolymer polypropylene. More preferably, the polypropylene is block copolymer polypropylene.

[0036] Specifically, in this invention, functional additives may be added according to performance requirements. Specifically, in this invention, the additives are 0-5 parts by weight. More specifically, the additives may be 2.5-5 parts.

[0037] Specifically, the additives include, but are not limited to, at least one of antioxidants and light stabilizers.

[0038] Specifically, the antioxidant includes, but is not limited to, at least one of hindered phenolic antioxidants or phosphite antioxidants. Specifically, the antioxidant may be at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanuric acid, tris[2,4-di-tert-butylphenyl]phosphite, or bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphate.

[0039] Specifically, the light stabilizer includes, but is not limited to, hindered amine light stabilizers. More specifically, the light stabilizer includes, but is not limited to, at least one of UV-3808, LA-402XP, or LA-402AF.

[0040] Furthermore, this invention claims protection for a method for preparing a polypropylene composite material, wherein the raw materials are mixed evenly and then melt-extruded to obtain the polypropylene composite material.

[0041] Preferably, the melt extrusion temperature is 170-220℃.

[0042] Preferably, the melt extrusion is performed using a twin-screw extruder. More specifically, the length-to-diameter ratio of the twin-screw extruder is 70-80:1.

[0043] Preferably, the screw speed of the twin-screw extruder is 350-450 r / min.

[0044] Furthermore, the present invention claims protection for an automotive interior and exterior trim component with a surface coated with a coating, the automotive interior and exterior trim component comprising the aforementioned polypropylene composite material.

[0045] Specifically, automotive interior and exterior trim parts include, but are not limited to, painted bumpers, pillar trims, and painted tailgate trims.

[0046] Compared with the prior art, the present invention has the following beneficial effects: This invention significantly improves the low-gloss properties and water-boiling foam resistance of polypropylene materials by adding polyethylene glycol, polar modified polyolefin, and hollow glass microspheres of two different particle sizes to a polypropylene matrix. Detailed Implementation

[0047] The present invention will be further described below with reference to the specification and specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in this technical field.

[0048] Polypropylene: PP-1: Block copolymer polypropylene, MFR=10g / 10min at 230℃ and 2.16kg load, BX3500, purchased from SKIC Korea; PP-2: Block copolymer polypropylene, MFR=30g / 10min at 230℃ and 2.16kg load, BX3800, purchased from SKIC Korea; PP-3: Homopolymer polypropylene, MFR=30g / 10min at 230℃ and 2.16kg load, SZ30S, purchased from Sinopec-Korea Petrochemical (Wuhan). PP-4: Copolymer polypropylene, MFR=60g / 10min at 230℃ and 2.16kg load, BX3900, purchased from SKIC Korea.

[0049] POE: POE-1: MFR of 0.5 g / 10min at 190℃ and 2.16 kg load, POE ENGAGE 8150, purchased from Dow Chemical. POE-2: MFR of 3.6 g / 10 min at 190℃ and 2.16 kg load, DF640, purchased from Mitsui Chemicals; POE-3: MFR of 5 g / 10 min at 190℃ and 2.16 kg load, POE ENGAGE 7447, purchased from Dow Chemical. POE-4: MFR of 13 g / 10 min at 190 °C and 2.16 kg load, POE ENGAGE 8137, purchased from Dow Chemical.

[0050] Polyethylene glycol: PEG-200: weight average molecular weight of 200 g / mol, purchased from Yatai Chemical; PEG-600: weight average molecular weight of 600 g / mol, purchased from Yatai Chemical; PEG-1000: weight average molecular weight of 1000 g / mol, purchased from Yatai Chemical.

[0051] Polar modified polyolefins: Polar modified polyolefin resin-1: maleic anhydride grafted polypropylene, PC-1, purchased from Nanhai Baichen. Polar modified polyolefin resin-2: methyl acrylate grafted polyethylene, BZPP101, purchased from Chongqing Baozhuan.

[0052] Hollow glass microspheres: HGM-1: Dn50 is 25μm, Dn90 is 40μm, HS42, purchased from Zhengzhou Shenglait; HGM-2: Dn50 is 16μm, Dn90 is 25μm, HS60, purchased from Zhengzhou Shenglait; HGM-3: Dn50 is 13μm, Dn90 is 20μm, HS65, purchased from Zhengzhou Shenglait; HGM-4: Dn50 is 10μm, Dn90 is 15μm, HS70, purchased from Zhengzhou Shenglait; HGM-5: Dn50 is 35μm, Dn90 is 55μm, HL60S, purchased from Zhengzhou Shenglait; HGM-6: Dn50 is 40μm, Dn90 is 65μm, HL60, purchased from Zhengzhou Shenglait.

[0053] Additives: Antioxidant: Antioxidant 1010, purchased from Shandong Sanfeng.

[0054] Light stabilizers: hindered amines, UV 3808, purchased from Solvay, Belgium.

[0055] Unless otherwise specified, all components (such as antioxidants and light stabilizers) used in the parallel examples and comparative examples are the same commercially available products.

[0056] Examples 1-19 A polypropylene composite material is prepared according to the formula weight parts in Table 1-3 and the preparation method including the following steps: the raw materials in Table 1-3 are mixed evenly according to the weight parts, and then prepared by melt extrusion. The melt extrusion is carried out by a 75D co-rotating twin-screw extruder. The temperature of the twin-screw extruder from the feeding section to the die head is 170℃, 200℃, 200℃, 210℃, 210℃, 205℃, 205℃, 205℃, 200℃, 200℃, and the screw speed is 350 rpm.

[0057] Table 1

[0058] Table 2

[0059] Table 3

[0060] Comparative Examples 1-4 The weight proportions of raw materials used in the following comparative examples are shown in Table 4. The preparation method is the same as that in Example 1 above.

[0061] Table 4

[0062] Test case The properties of the polypropylene composite materials obtained in the above examples and comparative examples were characterized. The specific test items, test methods, and results are shown in Table 6 below: (1) Surface gloss characterization: The surface of the prepared sample was tested using a BYK Pvlt 0925 gloss meter at a 60° measurement angle; (2) Characterization of water boiling resistance and foaming performance: The above polypropylene composite material was made into a 100mm×100mm×20mm flat sample, and then the paint was sprayed according to the process of annealing (80℃ / 1h) → spraying (Nippon solvent-based 3C1B process coating) → drying (80℃ / 1h). After being placed in a high-temperature water environment at 100℃ for 4h, the test was carried out. The high-temperature water boiling test mainly focuses on the foaming of the material. The foaming level is shown in Table 5.

[0063] Table 5

[0064] Table 6

[0065] This invention provides a polypropylene composite material with low gloss and resistance to boiling and foaming. More specifically, the polypropylene composite material provided by this invention has a gloss level ≤35.2, a foaming grade ≤1, and a foam size ≤S1.

[0066] As can be seen from Examples 2 and 5-8, when D1n50 / D2n50 meets a specific ratio, or when the particle size of hollow glass microspheres is ≤35μm, the prepared polypropylene composite material has lower gloss, foaming grade and foam size.

[0067] As can be seen from Examples 2 and 14-16, when the melt flow rate of POE resin is within a specific range, the prepared polypropylene composite material has lower gloss and smaller bubble size.

[0068] As can be seen from Examples 2, 17 and 18, when the weight-average molecular weight of polyethylene glycol is within a specific range, the prepared polypropylene composite material has lower gloss, foaming grade and foam size.

[0069] As can be seen from Examples 1 and Comparative Examples 1 to 4, it is difficult to achieve the technical effects of the present invention when hollow glass microspheres of the same particle size are used, or when the polypropylene system does not contain hollow glass microspheres or polyethylene glycol, or does not contain polar modified polyolefins.

[0070] The foregoing examples are merely illustrative, used to explain some features of the method described in this invention. The appended claims are intended to claim the broadest possible scope, and the embodiments presented herein are demonstrated by the applicant's actual experimental results. Therefore, the applicant intends that the appended claims are not limited by the selection of examples illustrating the features of the invention. Some numerical ranges used in the claims also include sub-ranges within them, and variations within these ranges should also be interpreted as being covered by the appended claims where possible.

Claims

1. A polypropylene composite material, characterized in that, By weight, it includes the following components: 30-80 parts polypropylene, 5-30 parts POE resin, 10-20 parts polar modified polyolefin, 0.5-2.5 parts polyethylene glycol, and 5-10 parts hollow glass microspheres. The hollow glass microspheres include a first hollow glass microsphere and a second hollow glass microsphere. The particle size D1n50 of the first hollow glass microsphere and the particle size D2n50 of the second hollow glass microsphere satisfy the condition: D1n50 / D2n50≥1.

2.

2. The polypropylene composite material according to claim 1, characterized in that, The melt flow rate of the POE resin at 190℃ and 2.16kg is 0.5-13 g / 10min; Preferably, the melt flow rate of the POE resin at 190°C and 2.16 kg is 0.5-5 g / 10 min; more preferably, the melt flow rate of the POE resin at 190°C and 2.16 kg is 3.6-5 g / 10 min.

3. The polypropylene composite material according to claim 1, characterized in that, The polar modified polyolefin is a polar monomer-grafted polyolefin; The polar monomer is at least one of the following: anhydride monomers, acrylic monomers, and acrylate monomers that can polymerize with double bonds; the polyolefin is at least one of the following: polyethylene, polypropylene, ethylene-butene copolymer, ethylene-hexene copolymer, ethylene-octene copolymer, ethylene-propylene-butadiene terpolymer, and ethylene-acrylate copolymer.

4. The polypropylene composite material according to claim 1, characterized in that, The weight-average molecular weight of the polyethylene glycol is 150-1000 g / mol; Preferably, the weight-average molecular weight of the polyethylene glycol is 200-600 g / mol.

5. The polypropylene composite material according to claim 1, characterized in that, The particle size D1n50 of the first hollow glass microsphere and the particle size D2n50 of the second hollow glass microsphere satisfy the following: D1n50 / D2n50 is 1.2-2.5; Preferably, the ratio of D1n50 / D2n50 is 1.4-2.

5.

6. The polypropylene composite material according to claim 5, characterized in that, The particle size D1n50 of the first hollow glass microspheres is ≤40 μm, and the particle size D2n50 of the second hollow glass microspheres is ≤40 μm; and / or The weight ratio of the first hollow glass microsphere to the second hollow glass microsphere is 1-2:

1.

7. The polypropylene composite material according to claim 1, characterized in that, The polypropylene has a melt flow rate of 10-60 g / 10 min at 230°C and 2.16 kg; and / or The polypropylene is selected from at least one of homopolymer polypropylene, random copolymer polypropylene, and block copolymer polypropylene.

8. A method for preparing the polypropylene composite material 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 composite material.

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

10. An automotive interior and exterior trim part with a surface coated, characterized in that, The automotive interior and exterior trim components include the polypropylene composite material according to any one of claims 1-7.

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