Polypropylene composition, process for its preparation and use thereof

Abstract

The application discloses a polypropylene composition, a preparation method and application thereof. The polypropylene composition comprises the following components in parts by weight: 58-92 parts of polypropylene resin, 1-9 parts of chlorinated polyethylene, 2-11 parts of polyolefin elastomer, 0.2-0.8 parts of amide lubricant, 2-22 parts of calcium carbonate and 0.08-0.6 parts of nucleating agent. The polypropylene resin is copolymerized polypropylene resin, and the content of EPR rubber phase in the polypropylene resin is 14-25%. The polypropylene composition has good polarity and high surface energy on the surface, and provides certain roughness, so that excellent bonding force with a vacuum aluminum plating layer can be obtained without primer, and the material surface appearance is good after vacuum aluminum plating.

Description

Technical Field

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

[0002] Commonly used substrates for aluminized automotive lighting components include polycarbonate (PC), ABS, modified polypropylene (PP), ABS / PC alloys, and polybutylene terephthalate (PBT). PP, with its advantages of low density, ease of processing, and excellent mechanical properties, is widely used in the automotive industry, home appliances, and daily chemical industries.

[0003] To enhance the decorative effect of PP, electroplating is typically used to form a metallic coating on the PP surface. However, PP is a non-polar polymer with low surface free energy, resulting in poor adhesion to metallic coatings, making conventional electroplating processes difficult to apply directly. Therefore, existing technologies often employ electroplating (such as chromium or nickel plating) or chemical plating to metallize the surface of polypropylene. Typically, by adding specific fillers to the polypropylene matrix or roughening the substrate surface, a coating with acceptable adhesion and satisfactory surface quality can be obtained.

[0004] However, applying existing polypropylene matrices to vacuum metallization processes presents significant challenges. This is because vacuum metallization is a physical vapor deposition process performed in a high-vacuum environment. Aluminum metal evaporates at high temperatures and is deposited directly onto the substrate surface in an atomic state. This process places extremely high demands on the substrate's surface microstructure, surface energy, and cleanliness. Any minute surface defects, low-molecular-weight deposits, or uneven component distribution will be significantly amplified. Existing solutions typically require pre-coating the polypropylene composite with a primer. This primer completely covers the PP substrate surface, smooths the substrate, and conceals surface defects, providing a polar surface for strong adhesion to the aluminum layer and improving the low adhesion problem. However, the addition of a primer consumes additional primer material, adds coating and curing processes, and increases production costs and time.

[0005] Therefore, developing a primer-free polypropylene composition that exhibits excellent bonding performance with vacuum-metallized layers and good surface quality has broad application value. Summary of the Invention

[0006] To address the aforementioned technical problems, the primary objective of this invention is to provide a polypropylene composition. This polypropylene composition exhibits good polarity and high surface energy, while also providing a certain degree of roughness. It achieves excellent adhesion to vacuum-metallized layers without the need for a primer, and the resulting material exhibits a superior surface appearance after vacuum metallization.

[0007] A second objective of this invention is to provide a method for preparing a polypropylene composition.

[0008] A third objective of this invention is to provide an application of a polypropylene composition in the fields of daily chemicals, automobiles, and home appliances.

[0009] The fourth objective of this invention is to provide a polypropylene part with a vacuum-plated aluminum surface.

[0010] To achieve the above objectives, the present invention is implemented through the following technical solution: This invention claims protection for a polypropylene composition, comprising, by weight, the following components: 58-92 parts polypropylene resin, 1-9 parts chlorinated polyethylene, 2-11 parts polyolefin elastomer, 0.2-0.8 parts amide lubricant, 2-22 parts calcium carbonate, and 0.08-0.6 parts nucleating agent. The polypropylene resin is a copolymer polypropylene resin; The polypropylene resin contains 14-25% EPR rubber phase.

[0011] In this invention, using copolymer polypropylene as the matrix resin increases the content of amorphous regions and improves the toughness of the composition. The more flexible resin matrix can better encapsulate and fix calcium carbonate. The combination of copolymer polypropylene and calcium carbonate can form a more uniform and controllable micro-rough surface structure. The micro-rough surface structure is the main force for forming physical anchoring points, allowing the electroplated aluminum metal deposited on the surface of the composition to fill the micro-grooves. After cooling, mechanical interlocking is formed, thereby improving the bonding force and making it difficult to peel the composition from the vacuum-plated aluminum layer. In the polypropylene system, chlorinated polyethylene can improve the polarity of the material through its own strongly polar chlorine element; on the other hand, it can also improve the compatibility of the system, making the components dispersed evenly and helping to improve the surface appearance quality.

[0012] Furthermore, the polyolefin elastomer in the system exhibits better compatibility with the copolymerized polypropylene, improving the compatibility and dispersion of various substances in the polypropylene system to form a more uniform and controllable micro-rough surface structure, rather than large-size defects. Furthermore, the nucleating agent used in this invention induces uniform crystallization of the polypropylene resin, forming more and finer crystalline structures. The increased crystalline structure of polypropylene provides greater anchoring effect on chlorinated polyethylene, making it easier to fix and expose the chlorinated polyethylene on the composition surface, thereby providing more polar sites that can interact with aluminum. The dense and uniform crystalline structure can also form a uniform micro-rough surface structure with calcium carbonate, resulting in better bonding with the vacuum-plated aluminum layer and thus reducing surface appearance defects.

[0013] Furthermore, when the EPR rubber phase content in the polypropylene resin is too low, the encapsulation and fixation of calcium carbonate are poor, failing to form a uniform and controllable micro-rough surface structure, resulting in a deterioration in the appearance of the polypropylene composition and its adhesion to the vacuum-metallized layer. When the EPR rubber phase content in the polypropylene resin is too high, the crystallization rate difference between the EPR phase and the polypropylene matrix during the crystallization process is large, leading to surface migration during injection molding, which further increases phase separation and is detrimental to the formation of a uniform micro-rough surface structure.

[0014] This invention uses copolymer polypropylene, combined with chlorinated polyethylene, polyolefin elastomer, amide lubricant, calcium carbonate and nucleating agent, which improves the polarity of the composition, increases the surface energy, and forms a more uniform and controllable micro-rough surface structure. This results in better adhesion to the vacuum-plated aluminum layer and a better surface appearance.

[0015] Specifically, the number of parts of the polypropylene resin can be 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts, etc., or any range formed by the above values, such as 60-90 parts, 70-80 parts, etc., and the present invention is not limited thereto. The number of parts of the chlorinated polyethylene can be 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, etc., or any range formed by the above values, such as 4-6 parts, 3-6 parts, etc., and the present invention is not limited thereto. The number of parts of the polyolefin elastomer can be 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc., or any range formed by the above values, such as 3-8 parts, 5-10 parts, etc., and the present invention is not limited thereto. The amount of the amide lubricant can be 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, 0.5 parts, 0.55 parts, 0.6 parts, 0.65 parts, 0.7 parts, 0.75 parts, etc., or any range formed by the above values, such as 0.4-0.6 parts, 0.3-0.5 parts, etc., and the present invention is not limited thereto. The amount of calcium carbonate can be 3 parts, 4 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, etc., or any range formed by the above values, such as 3-20 parts, 6-18 parts, etc., and the present invention is not limited thereto. The number of parts of the nucleating agent can be 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, 0.5 parts, 0.55 parts, etc., or any range formed by the above values, such as 0.6-1.0 parts, 0.8-1.5 parts, etc., and the present invention is not limited thereto.

[0016] Specifically, by weight, the polypropylene composition comprises the following components: 60-90 parts polypropylene resin, 2-8 parts chlorinated polyethylene, 3-10 parts polyolefin elastomer, 0.3-0.6 parts amide lubricant, 3-20 parts calcium carbonate, and 0.1-0.5 parts nucleating agent.

[0017] Specifically, in this invention, the polypropylene resin accounts for no less than 59.7% of the mass percentage of the polypropylene composition. Specifically, in this invention, the polypropylene resin accounts for no less than 60.7% of the mass percentage of the polypropylene composition.

[0018] Preferably, the melt flow rate of the polypropylene resin at 230°C and 2.16 kg load is 5-120 g / 10 min; and / or the content of the EPR rubber phase in the polypropylene resin is 15-20%.

[0019] Specifically, the melt flow rate of the polypropylene resin at 230°C and a load of 2.16 kg is 10-100 g / 10 min. Specifically, the melt flow rate of the polypropylene resin can be 15 g / 10 min, 20 g / 10 min, 30 g / 10 min, 40 g / 10 min, 50 g / 10 min, 60 g / 10 min, 70 g / 10 min, 80 g / 10 min, 90 g / 10 min, 100 g / 10 min, 110 g / 10 min, 120 g / 10 min, etc., or any range formed by the above values, such as 10-50 g / 10 min, 20-80 g / 10 min, etc., and the present invention is not limited thereto. Specifically, the test method for the melt flow rate of the polypropylene resin is ISO 1133-2022.

[0020] Specifically, the content of the EPR rubber phase in the polypropylene resin can be 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, etc., or any range formed by the above values, such as 14-16%, 18-22%, 19-21%, etc., and the present invention is not limited thereto. Specifically, the test method for the EPR rubber phase in the polypropylene resin is GB / T24282-2009.

[0021] Preferably, the chlorine content of the chlorinated polyethylene is 15-40%. More preferably, the chlorine content of the chlorinated polyethylene is 18-35%. Specifically, the chlorine content of the chlorinated polyethylene can be 20%, 25%, 28%, 30%, 32%, 34%, etc., or any range formed by the above values, such as 18-30%, 20-28%, etc., and the present invention is not limited thereto. Specifically, the test method for the chlorine content of the chlorinated polyethylene is: SH / T 1837-2023.

[0022] Preferably, the polyolefin elastomer includes, but is not limited to, ethylene butene, ethylene octene copolymer, etc.

[0023] Preferably, the melt flow rate of the polyolefin elastomer at 190°C and a load of 2.16 kg is 0.2-13 g / 10 min. More preferably, the melt flow rate of the polyolefin elastomer at 190°C and a load of 2.16 kg is 0.5-5 g / 10 min. Specifically, the melt flow rate of the polyolefin elastomer can be 0.5 g / 10 min, 1 g / 10 min, 1.5 g / 10 min, 2 g / 10 min, 2.5 g / 10 min, 3 g / 10 min, 3.5 g / 10 min, 4 g / 10 min, 4.5 g / 10 min, etc., or any range formed by the above values; the present invention is not limited thereto. Specifically, the test method for the melt flow rate of the polyolefin elastomer is ASTM-D1238.

[0024] Preferably, the calcium carbonate has a mesh size of 1000-3000 mesh. Specifically, the mesh size of the calcium carbonate can be 1200 mesh, 1500 mesh, 1800 mesh, 2000 mesh, 2200 mesh, 2500 mesh, 2800 mesh, etc., or any range formed by the above values, such as 1000-1500 mesh, 2000-2800 mesh, etc., and the present invention is not limited thereto. Specifically, the mesh size of the calcium carbonate can be measured by a mesh sieving method.

[0025] Preferably, the polypropylene composition further comprises 0-35 parts of talc. Specifically, the polypropylene composition further comprises 8-32 parts of talc; specifically, the polypropylene composition further comprises 10-30 parts of talc. Specifically, the amount of talc can be 3 parts, 5 parts, 8 parts, 10 parts, 13 parts, 15 parts, 18 parts, 20 parts, 23 parts, 25 parts, 28 parts, 30 parts, 33 parts, etc., or any range formed by the above values, such as 10-20 parts, 20-30 parts, etc., and the present invention is not limited thereto.

[0026] Preferably, the talc powder has a mesh size of 2000-4000 mesh. Specifically, the mesh size of the talc powder can be 2200 mesh, 2500 mesh, 2800 mesh, 3000 mesh, 3200 mesh, 3500 mesh, 3800 mesh, etc., or any range formed by the above values, such as 2500-3500 mesh, 2800-3200 mesh, etc., and the present invention is not limited thereto. Specifically, the mesh size of the talc powder can be measured by a mesh sieving method.

[0027] Preferably, the nucleating agent is at least one of alicyclic carboxylate nucleating agents, aryl phosphate nucleating agents, and aromatic aluminum carboxylate nucleating agents; preferably, the nucleating agent is at least one of alicyclic carboxylate nucleating agents and aryl phosphate nucleating agents. Preferably, the nucleating agent is selected from at least one of 2,2'-methylene-bis(4,6-di-tert-butylphenyl)phosphate aluminum, 2,2-methylene-bis(4,6-di-tert-butylphenyl)phosphate sodium, cis-1,2-cyclohexanedicarboxylate calcium salt, and bicyclo[2.2.1]heptane-2,3-dicarboxylate disodium salt; and / or the amide lubricant is selected from at least one of erucamide, stearyl erucamide, and oleamide.

[0028] Preferably, the polypropylene composition further includes at least one of an antioxidant and a light stabilizer.

[0029] More preferably, the antioxidant is selected from at least one of hindered phenolic antioxidants and phosphite antioxidants. Specifically, the antioxidant includes, but is not limited to, pentaerythritol tetrakis(β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, tris(2,4-di-tert-butylphenyl) phosphite, and dioctadecyl pentaerythritol diphosphite.

[0030] More preferably, the light stabilizer is selected from hindered amine light stabilizers. The light stabilizer includes, but is not limited to, 2,2,6,6-tetramethyl-4-piperidine stearate (such as UV3808PP5, LA-402AF), bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate (UV770), etc.

[0031] Furthermore, this invention claims protection for a method for preparing a polypropylene composition, wherein the component raw materials are mixed uniformly, melt-extruded, and the polypropylene composition is obtained.

[0032] Preferably, the melt extrusion temperature is 160-210℃. Preferably, a twin-screw extruder is used for extrusion; the length-to-diameter ratio of the twin-screw extruder is 40-60:1. Preferably, the rotational speed of the twin-screw extruder is 350-450 r / min.

[0033] Furthermore, this invention claims protection for the application of a polypropylene composition in the fields of daily chemicals, automobiles, and home appliances.

[0034] Furthermore, the present invention claims protection for a polypropylene part with a vacuum-metallized surface, the polypropylene part comprising the polypropylene composition described above.

[0035] More specifically, the polypropylene parts with vacuum-aluminized surfaces include, but are not limited to, automotive lamps, automotive lamp reflectors, handles, car logos, bottle caps, etc.

[0036] Compared with the prior art, the present invention has the following beneficial effects: This invention uses copolymerized polypropylene combined with chlorinated polyethylene, polyolefin elastomer, amide lubricant, calcium carbonate and nucleating agent, which makes the polypropylene composition have better adhesion to the vacuum metallized layer, resulting in a better surface appearance and improving the surface defects of the metallized parts. Detailed Implementation

[0037] 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.

[0038] Polypropylene resin 1, copolymerized polypropylene resin, with a melt flow rate of 10 g / 10 min at 230℃ and 2.16 kg, EPR rubber phase content of 28%, K9010, Formosa Plastics.

[0039] Polypropylene resin 2, copolymerized polypropylene resin, with a melt flow rate of 29 g / 10 min at 230℃ and 2.16 kg, EPR rubber phase content of 20%, PP EP548R, CNOOC Shell.

[0040] Polypropylene resin 3, copolymerized polypropylene resin, with a melt flow rate of 30 g / 10 min at 230℃ and 2.16 kg, EPR rubber phase content of 15%, K7227H, Wuhan Zhonghan Petrochemical.

[0041] Polypropylene resin 4, copolymerized polypropylene resin, with a melt flow rate of 60 g / 10 min at 230℃ and 2.16 kg, EPR rubber phase content of 11.9%, EP648U, CNOOC Shell.

[0042] Polypropylene resin 5, homopolymer polypropylene resin, melt flow rate of 20g / 10min at 230℃ and 2.16kg, PPH-MM20-S, Sinopec.

[0043] Chlorinated polyethylene 1, chlorine content 35%, CPE-135A, Shandong Rike.

[0044] Chlorinated polyethylene 2, chlorine content 18%, PA-221, Shandao Chemical.

[0045] Chlorinated polypropylene, chlorine content 20%, F-2P, Toyobo.

[0046] Ethylene octene polyolefin elastomer 1, with a melt flow rate of 5 g / 10 min at 190 °C and 2.16 kg load, ENGAGE 11547, Dow.

[0047] Ethylene octene polyolefin elastomer 2, with a melt flow rate of 0.5 g / 10 min at 190 °C and 2.16 kg load, POE-8150, Dow Chemical.

[0048] Lubricant 1, Amide lubricant, Oleamide, ARMOSLIP CP, PMC.

[0049] Lubricant 2, Amide Lubricant, Erucamide, CRODAMIDE ER-CH-MB-(SI), Croda Chemical (Sichuan) Co., Ltd.

[0050] Lubricant 3, Amide Lubricant, Stearyl Erucamide, Finawax-SE, Shanghai Canal New Materials.

[0051] Lubricant 4, stearate lubricant, calcium stearate, BS-3818, Zhongshan Huamingtai.

[0052] Calcium carbonate, mesh size 3000, AC-05N, Guangdong Xianglong Technology Co., Ltd.

[0053] Talc powder, mesh size 3000, TYT-777A, Liaoning Tianyuan.

[0054] Nucleating agent 1, aryl phosphate salt nucleating agent, sodium 2,2-methylene bis(4,6-di-tert-butylphenyl) phosphate, TMP-1, Shanxi Chemical Research Institute.

[0055] Nucleating agent 2, alicyclic carboxylate nucleating agent, dicyclic [2.2.1]heptane-2,3-dicarboxylate disodium salt, HPN-68, Milliken.

[0056] Nucleating agent 3, aryl phosphate salt nucleating agent, 2,2'-methylene-bis(4,6-di-tert-butylphenyl)phosphate aluminum hydroxyl, NA-21, Adico.

[0057] Nucleating agent 4, aromatic carboxylic acid aluminum salt nucleating agent, bis[4-(1,1-dimethylethyl)benzoyl-oxy]aluminum hydroxide, AL-PTBBA, Zhongda Chemical.

[0058] Antioxidant 1, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid], commercially available.

[0059] Antioxidant 2, tris[2,4-di-tert-butylphenyl]phosphite, commercially available.

[0060] Light stabilizer, hindered amine light stabilizer, LA-402AF, Adico.

[0061] 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.

[0062] Examples 1-13 A polypropylene composition is prepared according to the formula weight parts in Table 1-2 and the preparation method including the following steps: the components are mixed evenly to obtain a mixture; the mixture is added to a twin-screw extruder (length-to-diameter ratio of 48:1) for melt mixing, the extruder is set to the following temperatures: 160, 170, 180, 190, 200, 200℃, die temperature 210℃, feed rate 30 kg, vacuum degree -0.08 MPa, screw speed 380 rpm, and extrusion granulation is performed to obtain the polypropylene composition.

[0063] Table 1

[0064] Table 2

[0065] Comparative Examples 1-9 The weight proportions of raw materials used in the following comparative examples are shown in Table 3. The preparation method is the same as that in Example 1 above.

[0066] Table 3

[0067] Test case The polypropylene compositions obtained in the above examples and comparative examples were tested as follows.

[0068] (1) Appearance evaluation after vacuum aluminizing: Vacuum aluminizing process: ① Pre-treatment of polypropylene composite substrate, such as cleaning, degreasing, and dry ice purging, to improve the adhesion between the aluminum coating and the polypropylene composite substrate. ② Magnetron sputtering vapor deposition is used, where argon ions are accelerated and bombarded on the surface of the aluminum target under vacuum and strong electric field conditions, causing the aluminum target to sputter. The sputtered aluminum atoms are deposited on the surface of the polypropylene composite substrate to form a thin aluminum layer with a thickness of 40μm. ③ Spraying a protective layer; ④ Post-treatment: The polypropylene parts after aluminizing are cleaned, dried, and annealed to improve the density and stability of the vacuum aluminized layer.

[0069] (2) Evaluation of the adhesion between the vacuum-metallized layer and the polypropylene composite substrate: Refer to ASTM D3359-09 standard. ASTM Grade 5B: Smooth cut edges, no peeling. ASTM Grade 4B: Small peeling, damage not exceeding 5%. ASTM Grade 3B: Peeling area 5%-15%. ASTM Grade 2B: Large peeling, area 15%-35%. ASTM Grade 1B: Large-area peeling, 35%-65%. ASTM Grade 0B: Peeling exceeds the above grades.

[0070] Evaluation method for appearance after aluminizing: Using a 100*100*3mm high-gloss plate, after vacuum aluminizing, inspect the central area (1600mm) under fluorescent light. 2 The number and size of the concave / convex points within the area are recorded according to the levels in Table 4 below. Specifically, if the number of concave / convex points is level A and the size level is 1, the appearance level after vacuum aluminizing is recorded as A1; if the number of concave / convex points is level B and the size level is 1, the appearance level after vacuum aluminizing is recorded as B1; all others are recorded the same.

[0071] Table 4

[0072] Table 5 shows the test data for the polypropylene compositions prepared in the examples and comparative examples.

[0073] Table 5

[0074] As shown in Table 5, the polypropylene composition provided by this invention has good adhesion to the vacuum-metallized layer, and the metallized layer has good surface quality. More specifically, the appearance grade after metallization is A1 or B1, and the cross-cut adhesion test grade is ≥4B. Preferably, the appearance grade after metallization is A1, and the cross-cut adhesion test grade is ≥5B.

[0075] As can be seen from Example 1 and Comparative Example 1, it is difficult to achieve the technical effects of the present invention when polyolefin elastomers are not used in the system.

[0076] As can be seen from Example 1 and Comparative Example 2, it is difficult to achieve the technical effects of the present invention when chlorinated polyethylene is not used in the system.

[0077] As can be seen from Example 1 and Comparative Example 3, when calcium carbonate is used as a filler in the system, it can improve the bonding force with the vacuum aluminum plating layer and the aluminum plating layer has better surface quality.

[0078] As can be seen from Examples 1, 4, and 8, it is difficult to achieve the technical effects of the present invention when no lubricant or other types of lubricants are used in the system.

[0079] As can be seen from Examples 1 and Comparative Examples 5-7, the copolymer polypropylene with a specific EPR rubber phase content in this invention can effectively improve the bonding force between the composition and the vacuum aluminum plating layer, and improve the surface quality.

[0080] As can be seen from Example 1 and Comparative Example 9, when chlorinated polypropylene is used instead of chlorinated polyethylene, the technical effect of the present invention cannot be achieved.

[0081] 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 composition, characterized in that, By weight, it comprises the following components: 58-92 parts polypropylene resin, 1-9 parts chlorinated polyethylene, 2-11 parts polyolefin elastomer, 0.2-0.8 parts amide lubricant, 2-22 parts calcium carbonate, and 0.08-0.6 parts nucleating agent. The polypropylene resin is a copolymer polypropylene resin; The polypropylene resin contains 14-25% EPR rubber phase.

2. The polypropylene composition according to claim 1, characterized in that, The polypropylene resin has a melt flow rate of 5-120 g / 10 min at 230°C and 2.16 kg load; and / or The polypropylene resin contains 15-20% EPR rubber phase.

3. The polypropylene composition according to claim 1, characterized in that, The chlorine content of the chlorinated polyethylene is 15-40%.

4. The polypropylene composition according to claim 1, characterized in that, The polyolefin elastomer has a melt flow rate of 0.2-13 g / 10 min at 190°C and 2.16 kg load.

5. The polypropylene composition according to claim 1, characterized in that, The nucleating agent is at least one of alicyclic carboxylate nucleating agents, aryl phosphate nucleating agents, and aromatic aluminum carboxylate nucleating agents; preferably, the nucleating agent is at least one of alicyclic carboxylate nucleating agents and aryl phosphate nucleating agents; preferably, the nucleating agent is selected from at least one of 2,2'-methylene-bis(4,6-di-tert-butylphenyl)phosphate aluminum, 2,2-methylene-bis(4,6-di-tert-butylphenyl)phosphate sodium, cis-1,2-cyclohexanedicarboxylate calcium salt, and bicyclo[2.2.1]heptane-2,3-dicarboxylate disodium salt; and / or The amide lubricant is selected from at least one of erucamide, stearyl erucamide, oleamide, or docosyl fatty amide.

6. The polypropylene composition according to claim 1, characterized in that, The polypropylene composition further includes 8-32 parts of talc.

7. The polypropylene composition according to claim 1 or 6, characterized in that, The polypropylene composition further includes at least one of an antioxidant and a light stabilizer; Preferably, the antioxidant is selected from at least one of hindered phenolic antioxidants and phosphite antioxidants; Preferably, the light stabilizer is selected from hindered amine light stabilizers.

8. A method for preparing the polypropylene composition according to any one of claims 1-7, characterized in that, The various raw materials are mixed evenly, melt-extruded, and the polypropylene composition is prepared.

9. The use of the polypropylene composition according to any one of claims 1-7 in the fields of daily chemical industry, automotive industry, and home appliance industry.

10. A polypropylene part with a vacuum-deposited aluminum surface, characterized in that, The polypropylene component comprises the polypropylene composition according to any one of claims 1-7.

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