Polypropylene composition, process for its preparation and use thereof

Abstract

This invention discloses a polypropylene composition, its preparation method, and its applications, belonging to the field of polymer materials technology. The polypropylene composition provided by this invention comprises the following components in parts by weight: 23-62 parts PP resin, 18-32 parts POE elastomer, 1-7 parts chopped glass fiber, and 13-27 parts mica powder; wherein the PP resin is prepared at a temperature of 200°C and a shear rate of 100 s. ‑1 melt shear viscosity η PP With POE elastomer at a temperature of 200℃ and a shear rate of 100s ‑1 melt shear viscosity η POE The ratio η PP / η POE The aspect ratio of the chopped glass fibers is 0.38-1.65; the aspect ratio of the chopped glass fibers is 280-350; and the D50 diameter of the mica powder is 15-35 μm. The polypropylene composition provided by this invention has a low linear coefficient of thermal expansion and high coating adhesion.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, and particularly relates to a polypropylene composition, its preparation method and application. Background Technology

[0002] Polypropylene, as a cost-effective general-purpose plastic, has excellent mechanical properties such as high strength and high toughness, as well as chemical resistance and high heat resistance after modification, and is widely used in home appliances and automotive products.

[0003] With the growing global emphasis on environmental protection and energy conservation, lightweighting of automobiles has become a major trend in the automotive industry. The replacement of metal components with polypropylene or its integration with metal components is becoming increasingly common. Meanwhile, for automotive exteriors, the use of water-based spraying instead of traditional oil-based spraying to reduce volatile organic compounds (VOCs) during the automotive manufacturing process has been adopted by numerous OEMs both domestically and internationally, placing higher demands on the spray adhesion performance of polypropylene materials.

[0004] Polypropylene is a semi-crystalline material with a low glass transition temperature in its amorphous region. It exhibits high thermal expansion and contraction characteristics over a wide temperature range, with a linear coefficient of thermal expansion (CLTE) of approximately 120 × 10⁻⁶. -6 Because of its low temperature (CLTE), polypropylene materials are prone to dimensional mismatches when used in conjunction with metal parts, leading to abnormal noises and aesthetic discrepancies during use. Therefore, reducing the CLTE of polypropylene is an important direction for its development. Simultaneously, optimizing the material's coating performance can make it suitable for a wider range of automotive applications. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a polypropylene composition with excellent spraying performance, high adhesion after spraying, and a relatively low coefficient of linear thermal expansion (CLTE), as well as its preparation method and application.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a polypropylene composition comprising the following components in parts by weight:

[0007] 23-62 parts PP resin, 18-32 parts POE elastomer, 1-7 parts chopped glass fiber, 13-27 parts mica powder;

[0008] The PP resin is subjected to a temperature of 200℃ and a shear rate of 100s. -1 melt shear viscosity η PP With POE elastomer at a temperature of 200℃ and a shear rate of 100s -1 melt shear viscosity η POEThe ratio η PP / η POE The range is 0.38-1.65;

[0009] The aspect ratio of the chopped glass fibers is 280-350;

[0010] The D50 diameter of the mica powder is 15-35 μm.

[0011] The polypropylene composition provided by this invention, by selecting appropriate mass parts of the components, can effectively improve the spraying performance of the polypropylene composition through synergistic interaction between the components, and the resulting polypropylene composition has a low coefficient of linear thermal expansion.

[0012] Specifically, blending PP resin and POE elastomer within a specific melt shear viscosity ratio range facilitates the formation of a continuous phase, thereby reducing the linear coefficient of thermal expansion of the polypropylene composition. This also facilitates the penetration of subsequent coatings into the channels, improving the spray adhesion of the polypropylene composition. Simultaneously, selecting chopped glass fibers within a suitable aspect ratio range and mica powder within a suitable D50 diameter range as fillers allows for the formation of a filler network structure within the polypropylene composition through the stacking of sheet-like and fiber fillers. This restricts molecular chain movement, further reducing the linear coefficient of thermal expansion of the polypropylene composition. Furthermore, because this invention selects PP resin and POE elastomer with specific melt shear viscosity ratios, the dispersibility of chopped glass fibers and mica powder throughout the system is also at an optimal level, contributing to a comprehensive improvement in the spray adhesion of the polypropylene composition.

[0013] For example, the PP resin can be any point value or any two-point range between 23 and 62 parts, such as 25-60 parts, or 23, 25, 28, 30, 32, 35, 38, 40, 42, 45, 48, 50, 52, 55, 58, 60, 62, etc.; the POE elastomer can be any point value or any two-point range between 18 and 32 parts, such as 20-30 parts, or 18... The quantities are: 1 part, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, etc.; the chopped glass fiber can be any point value or any two-point range value between 1 and 7 parts, for example, 2-6 parts, or 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, etc.; the mica powder can be any point value or any two-point range value between 13 and 27 parts, for example, 15-25 parts, or 13 parts, 15 parts, 17 parts, 19 parts, 21 parts, 23 parts, 25 parts, 27 parts, etc.

[0014] Preferably, the mass percentage of PP resin in the polypropylene composition is ≥25%.

[0015] More preferably, the mass percentage of PP resin in the polypropylene composition is 32-56%.

[0016] It should be noted that the PP resin is subjected to a temperature of 230°C and a shear rate of 100 s. -1 melt shear viscosity η PP The results were obtained in accordance with the ISO 11443-2005 standard, specifically through a Goettfert RG20 capillary rheometer, with an aspect ratio of 20 / 1 and a 90-degree angle capillary.

[0017] It should be noted that POE elastomer is suitable for temperatures of 200℃ and shear rates of 100 s. -1 melt shear viscosity η POE The results were obtained in accordance with the ISO 11443-2005 standard, specifically through a Goettfert RG 20 capillary rheometer, with an aspect ratio of 20 / 1 and a 90-degree angle capillary.

[0018] For example, the PP resin is subjected to a temperature of 200°C and a shear rate of 100 s. -1 melt shear viscosity η PP With POE elastomer at a temperature of 200℃ and a shear rate of 100s -1 melt shear viscosity η POE The ratio η PP / η POE It can be any point value or any two-point range value between 0.38 and 1.65, such as 0.4-1.63, or 0.38, 0.4, 0.42, 0.45, 0.48, 0.5, 0.52, 0.55, 0.58, 0.6, 0.62, 0.65, 0.68, 0.7, 0.72, 0.75, 0.78, 0.8, 0.82, 0.85, 0.88, 0.9, 0.92, 0.95, 0.98, 1, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, 1.6, 1.63, 1.65, etc.

[0019] It should be noted that the aspect ratio of the chopped glass fiber is calculated by first measuring the length and diameter of the chopped glass fiber using a scanning electron microscope, and then calculating the aspect ratio of the chopped glass fiber by dividing the length by the diameter.

[0020] For example, the aspect ratio of the chopped glass fiber can be any point value or any two points between 280 and 350, such as 285-346, 315-325, or 280, 285, 290, 295, 300, 305, 310, 315, 320, 325, 330, 335, 340, 345, 350, etc.

[0021] Preferably, the aspect ratio of the chopped glass fibers is 315-325.

[0022] This invention does not particularly limit the length and diameter of the chopped glass fibers; the effects of this invention can be achieved within the conventional length and diameter range of chopped glass fibers. For example, the length of the chopped glass fibers can be 3.0-4.5 mm, and the diameter can be 10-14 μm.

[0023] It should be noted that the D50 diameter of the mica powder was tested using a laser particle size analyzer in accordance with GB / T 19077-2016.

[0024] The D50 diameter of the mica powder described in this invention is the Dv50 diameter, which is the particle size corresponding to the cumulative particle size distribution percentage of mica powder when the diameters are arranged in ascending order.

[0025] For example, the D50 diameter of the mica powder can be any point value or any two-point range value between 15-35μm, such as 16-33μm, 22-27μm, or 15μm, 18μm, 20μm, 22μm, 24μm, 26μm, 28μm, 30μm, 32μm, 34μm, 35μm, etc.

[0026] Preferably, the D50 diameter of the mica powder is 22-27 μm.

[0027] As a preferred embodiment of the polypropylene composition of the present invention, the polypropylene composition comprises the following components in parts by weight: 48-52 parts PP resin, 23-27 parts POE elastomer, 3-5 parts chopped glass fiber, and 20-24 parts mica powder.

[0028] This invention has found that the mass fraction of components in a polypropylene composition also affects the performance of the product. When the mass fraction of components in the polypropylene composition is further selected within the above-mentioned range, the overall performance of the obtained product is better.

[0029] In a preferred embodiment of the polypropylene composition of the present invention, the PP resin is subjected to a temperature of 200°C and a shear rate of 100 s. -1 melt shear viscosity η PP With POE elastomer at a temperature of 200℃ and a shear rate of 100s-1 melt shear viscosity η POE The ratio η PP / η POE It ranges from 0.80 to 1.50.

[0030] The present invention has found that when the melt shear viscosity ratio of PP resin and POE elastomer is further selected to be 0.80-1.50, the compatibility between the two is better. This not only allows them to form a continuous phase better, but also promotes the dispersion of chopped glass fibers and mica powder, thereby better reducing the linear thermal expansion coefficient of the polypropylene composition and improving the spraying performance of the polypropylene composition.

[0031] In a preferred embodiment of the polypropylene composition of the present invention, the PP resin is subjected to a temperature of 200°C and a shear rate of 100 s. -1 melt shear viscosity η PP The value is 50-700 Pa*s.

[0032] For example, the PP resin is subjected to a temperature of 200°C and a shear rate of 100 s. -1 melt shear viscosity η PP It can be a point value between 50-700 Pa*s or a range of any two points, such as 60-688 Pa*s, or 50 Pa*s, 60 Pa*s, 100 Pa*s, 150 Pa*s, 200 Pa*s, 250 Pa*s, 300 Pa*s, 350 Pa*s, 400 Pa*s, 450 Pa*s, 500 Pa*s, 550 Pa*s, 600 Pa*s, 650 Pa*s, 700 Pa*s, etc.

[0033] Preferably, the PP resin is subjected to a temperature of 200°C and a shear rate of 100 s. -1 melt shear viscosity η PP The value is 120-400 Pa*s.

[0034] More preferably, the PP resin is subjected to a temperature of 200°C and a shear rate of 100 s. -1 melt shear viscosity η PP It is 280-360 Pa*s.

[0035] In a preferred embodiment of the polypropylene composition of the present invention, the PP resin includes at least one of homopolymer polypropylene and copolymer polypropylene.

[0036] In a preferred embodiment of the polypropylene composition of the present invention, the PP resin has a melt index of 10-150 g / 10 min at a temperature of 230°C and a load of 2.16 kg. The melt index is obtained by testing with reference to ASTM D-1238:10.

[0037] As a preferred embodiment of the polypropylene composition of the present invention, the POE elastomer is subjected to a temperature of 200°C and a shear rate of 100 s. -1 melt shear viscosity η POE The value is 130-1350 Pa*s.

[0038] For example, the POE elastomer is subjected to a temperature of 200°C and a shear rate of 100 s. -1 melt shear viscosity η POE It can be a point value between 130-1350 Pa*s or a range of any two points, such as 136-1320 Pa*s, or 130 Pa*s, 150 Pa*s, 200 Pa*s, 250 Pa*s, 300 Pa*s, 350 Pa*s, 400 Pa*s, 450 Pa*s, 500 Pa*s, 550 Pa*s, 600 Pa*s, 650 Pa*s, 700 Pa*s, 750 Pa*s, 800 Pa*s, 850 Pa*s, 900 Pa*s, 950 Pa*s, 1000 Pa*s, 1100 Pa*s, 1200 Pa*s, 1300 Pa*s, 1350 Pa*s, etc.

[0039] Preferably, the POE elastomer is subjected to a temperature of 200°C and a shear rate of 100 s. -1 melt shear viscosity η POE The value is 200-700 Pa*s.

[0040] More preferably, the POE elastomer is subjected to a temperature of 200°C and a shear rate of 100 s. -1 melt shear viscosity η POE The value is 245-350 Pa*s.

[0041] The present invention has found that, based on satisfying that the ratio of the melt shear viscosity of PP resin and POE elastomer is within a specific range, further selecting the melt shear viscosity of PP resin and POE elastomer to be within the above-mentioned range respectively results in a polypropylene composition with superior overall performance.

[0042] In a preferred embodiment of the polypropylene composition of the present invention, the POE elastomer includes at least one of ethylene-butene copolymer and ethylene-octene copolymer.

[0043] Preferably, the POE elastomer is an ethylene-octene copolymer.

[0044] In a preferred embodiment of the polypropylene composition of the present invention, the POE elastomer has a melt index of 4-30 g / 10 min at a temperature of 190°C and a load of 2.16 kg. The melt index is obtained by testing with reference to ASTM D-1238:10.

[0045] In a preferred embodiment of the polypropylene composition of the present invention, the polypropylene composition further includes 0-1 parts of additives.

[0046] In a preferred embodiment of the polypropylene composition of the present invention, the additives include at least one of antioxidants and light stabilizers.

[0047] For example, the antioxidant includes at least one of antioxidant 1010 and antioxidant 168. The light stabilizer includes at least one of UV-3808, UV-3853, and UV-944.

[0048] In a second aspect, the present invention provides a method for preparing the polypropylene composition, the method comprising the steps of: mixing and melt-extruding the components to obtain the polypropylene composition.

[0049] In a preferred embodiment of the preparation method described in this invention, the melting temperature is 190-210℃.

[0050] In a third aspect, the present invention provides a spray-painted part comprising the aforementioned polypropylene composition. The spray-painted part is used as an interior or exterior trim piece for automobiles.

[0051] For example, the coatings of the dashboard, door panels, tailgate, and bumper of a car may comprise the polypropylene composition.

[0052] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0053] The polypropylene composition provided by this invention, through the selection of appropriate mass proportions of its components, exhibits synergistic effects, effectively improving the spraying performance of the polypropylene composition and resulting in a polypropylene composition with a low coefficient of linear thermal expansion. Furthermore, the preparation method of the polypropylene composition provided by this invention is simple to operate and beneficial for practical production. Detailed Implementation

[0054] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0055] Unless otherwise specified, the reagents, methods and equipment used in this invention are all conventional reagents, methods and equipment in the field; and unless otherwise specified, the raw materials used in parallel experiments are from the same batch.

[0056] PP-1: Homopolymer polypropylene, PPH-Y26, at a temperature of 200℃ and a shear rate of 100 s. -1 The melt shear viscosity at that time was 280 Pa*s, according to Sinopec.

[0057] PP-2: Homopolymer polypropylene, PPH-M16, at a temperature of 200℃ and a shear rate of 100 s. -1 The melt shear viscosity at that time was 360 Pa*s, according to Sinopec.

[0058] PP-3: Homopolymer polypropylene, HP500N-Z, at a temperature of 200℃ and a shear rate of 100s. -1 The melt shear viscosity at that time was 400 Pa*s, CNOOC Shell Petrochemicals;

[0059] PP-4: Copolymer polypropylene, K7100, at a temperature of 200℃ and a shear rate of 100s. -1 The melt shear viscosity at that time was 120 Pa*s, Sinopec Yanshan Branch;

[0060] PP-5: Homopolymer polypropylene, PPH-MN150, at a temperature of 200℃ and a shear rate of 100s. -1 The melt shear viscosity at that time was 60 Pa*s, Sinopec Luoyang Branch;

[0061] PP-6: Homopolymer polypropylene, PP-T03, at a temperature of 200℃ and a shear rate of 100s. -1 The melt shear viscosity at that time was 688 Pa*s, according to Sinopec.

[0062] POE-1: Ethylene-octene copolymer, ENGAGE 11527, at a temperature of 200℃ and a shear rate of 100 s. -1 The melt shear viscosity at that time was 245 Pa*s, according to Dow Chemical.

[0063] POE-2: Ethylene-octene copolymer, ENGAGE 8137, at a temperature of 200°C and a shear rate of 100 s. -1 The melt shear viscosity at that time was 350 Pa*s, Dow Chemical.

[0064] POE-3: Ethylene-butene copolymer, ENGAGE 7447, at a temperature of 200℃ and a shear rate of 100 s. -1 The melt shear viscosity at that time was 694 Pa*s, according to Dow Chemical.

[0065] POE-4: Ethylene-butene copolymer, ENGAGE 7467, at a temperature of 200℃ and a shear rate of 100 s. -1 The melt shear viscosity at that time was 1320 Pa*s, Dow Chemical.

[0066] POE-5: Ethylene-octene copolymer, ENGAGE 8407, at a temperature of 200℃ and a shear rate of 100 s. -1 The melt shear viscosity at that time was 136 Pa*s, according to Dow Chemical.

[0067] Short-cut fiberglass 1: ECS14-4.5-508A, aspect ratio 320, Jushi Group Co., Ltd.;

[0068] Short-cut fiberglass 2: ECS14-04-508A, aspect ratio 285, Jushi Group Co., Ltd.;

[0069] Short-cut fiberglass 3: ECS13-4.5-508A, aspect ratio 346, Jushi Group Co., Ltd.;

[0070] Short-cut fiberglass 4: ECS10-4-508A, aspect ratio 400, Jushi Group Co., Ltd.;

[0071] Short-cut fiberglass 5: ECS13-3-508A, aspect ratio 230, Jushi Group Co., Ltd.;

[0072] Mica powder 1:1060HC, D50 diameter is 24.29μm, Lingshou County Huajing Mica Co., Ltd.;

[0073] Mica powder 2: 300HC, D50 diameter is 16.56μm, Lingshou County Huajing Mica Co., Ltd.;

[0074] Mica powder 3: C-325, D50 diameter is 32.35μm, Lingshou County Huajing Mica Co., Ltd.;

[0075] Mica powder 4: SW500, D50 diameter is 12.15μm, Suzhou Zhongwei Nonmetallic Materials Co., Ltd.;

[0076] Mica powder 5:120HC, D50 diameter is 52.86μm, Lingshou County Huajing Mica Co., Ltd.;

[0077] Antioxidant: Antioxidant 1010 and Antioxidant 168 are a mixture formed in a 1:1 mass ratio. Antioxidant 1010 and Antioxidant 168 are commercially available products.

[0078] Light stabilizer: UV-3808, commercially available.

[0079] Examples 1-14 and Comparative Examples 1-8

[0080] The present invention provides a polypropylene composition in the embodiments and comparative examples, wherein the component content (parts by weight) of the polypropylene composition is shown in Tables 1-2;

[0081] Table 1

[0082]

[0083]

[0084] Table 2

[0085]

[0086] The method for preparing the polypropylene composition provided in Example 1 is as follows:

[0087] After drying, the raw materials are weighed and mixed, then fed into a twin-screw extruder. The mixture is extruded, drawn into strands, cooled, pelletized, and dried to obtain a polypropylene composition.

[0088] The parameters of the twin-screw extruder are as follows: the length-to-diameter ratio of the twin-screw extruder is 40:1, the screw speed is 400 rpm, and the extrusion temperatures of each zone are 190℃, 190℃, 200℃, 200℃, 200℃, 210℃, and 200℃, respectively.

[0089] The preparation methods of the polypropylene compositions provided in Examples 2-14 and Comparative Examples 1-8 are consistent with those in Example 1, except that the relevant components are not required.

[0090] Example of effect

[0091] The performance of the polypropylene compositions prepared in the embodiments and comparative examples of this invention is verified by the following examples: The prepared polypropylene compositions were injection molded at a temperature of 200°C. The original dimensions of the injection molded sample were 100mm*100mm*3mm, which could be used for spray coating adhesion level testing. At the same time, small squares of 10mm*10mm*3mm were cut out for CLTE testing.

[0092] 1. CLTE test: Refer to standard GB / T 36800.2-2018, test temperature range -30-100℃;

[0093] 2. Spray coating adhesion test: In accordance with the relevant provisions in standard NES M0141[2016-1], the material was sprayed with three layers of paint, baked at 80℃ for 30 minutes, and the paint layer peel force was calculated and recorded by tensile test.

[0094] The test results are shown in Table 3.

[0095] Table 3

[0096]

[0097]

[0098] As can be seen from Table 3, when the technical solution of the present invention is adopted, the obtained polypropylene composition has a low linear thermal expansion coefficient and high adhesion; specifically, the linear thermal expansion coefficient of the obtained product is 58*10. -6 At temperatures below ℃, the adhesion is above 952 N / cm;

[0099] As can be seen from Examples 1, 4-10 and Comparative Examples 1-2, the ratio of the melt shear viscosity of PP resin and POE elastomer used in the polypropylene composition affects the overall performance of the product. When the ratio of the melt shear viscosity of PP resin and POE elastomer in Comparative Examples 1-2 is not within the range given in this invention, the linear expansion coefficient of the obtained product is greatly increased and the coating adhesion is greatly reduced, and the effect of this invention cannot be achieved.

[0100] As can be seen from Examples 1, 11-12, and Comparative Examples 3-4, the aspect ratio of chopped glass fibers in the polypropylene composition also affects the overall performance of the product. When the aspect ratio of chopped glass fibers in Comparative Example 3 is too large, the chopped glass fibers in the obtained product are easily broken, which is not conducive to the construction of the filler network. Furthermore, the broken chopped glass fibers result in a poor appearance of the material, leading to a significant increase in the linear expansion coefficient of the material and a significant decrease in the coating adhesion, thus failing to achieve the effect of the present invention. When the aspect ratio of chopped glass fibers in Comparative Example 4 is too small, the glass fiber network in the obtained product is incomplete, thus failing to achieve the effect of the present invention.

[0101] As can be seen from Examples 1, 13-14 and Comparative Examples 5-6, the D50 diameter of mica powder in the polypropylene composition also affects the performance of the product. When the D50 diameter of mica powder in Comparative Example 5 is too small, the filler network constructed by the obtained product is imperfect and cannot achieve the effect of the present invention. When the D50 diameter of mica powder in Comparative Example 6 is too large, the mica powder in the obtained product is easily broken and difficult to disperse completely, the constructed filler network is imperfect and cannot achieve the effect of the present invention.

[0102] As can be seen from Examples 1 and Comparative Examples 7-8, the effects of the present invention cannot be achieved when either chopped glass fiber or mica powder is missing. Specifically, when mica powder is not added in Comparative Example 7, the adhesion of the obtained product decreases significantly. When chopped glass fiber is not added in Comparative Example 8, the linear thermal expansion coefficient of the obtained product increases significantly, and the adhesion also shows a certain downward trend.

[0103] Finally, it should be noted that the above embodiments are used to illustrate the technical solutions of the present invention and not to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A polypropylene composition, characterized in that, The polypropylene composition comprises the following components by mass fraction: 23-62 parts of PP resin, 18-32 parts of POE elastomer, 1-7 parts of short glass fiber, 13-27 parts of mica powder; the ratio of the melt shear viscosity η of the PP resin at a temperature of 200°C and a shear rate of 100 S -1 to the melt shear viscosity η of the POE elastomer at a temperature of 200°C and a shear rate of 100 S PP -1 POE PP POE is 0.38-1.65;​​​​ The aspect ratio of the short glass fiber is 280-350; The D50 diameter of the mica powder is 15-35 μm.

2. The polypropylene composition according to claim 1, characterized in that The polypropylene composition comprises the following components by mass fraction: 48-52 parts of PP resin, 23-27 parts of POE elastomer, 3-5 parts of short glass fiber, 20-24 parts of mica powder.

3. The polypropylene composition according to claim 1, characterized in that The PP resin is subjected to a temperature of 200℃ and a shear rate of 100s. -1 melt shear viscosity η PP With POE elastomer at a temperature of 200℃ and a shear rate of 100s -1 melt shear viscosity η POE The ratio η PP / η POE It ranges from 0.80 to 1.

50.

4. The polypropylene composition according to claim 1, characterized in that The PP resin is subjected to a temperature of 200℃ and a shear rate of 100s. -1 melt shear viscosity η PP The value is 50-700 Pa*s.

5. The polypropylene composition according to claim 1, characterized in that The POE elastomer has a melt shear viscosity η at a temperature of 200°C and a shear rate of 100 s -1 -130-1350 Pa*s. POE -130-1350 Pa*s.

6. The polypropylene composition according to claim 1, characterized in that The POE elastomer comprises at least one of ethylene butene copolymer, ethylene octene copolymer.

7. The polypropylene composition according to claim 1, characterized in that The polypropylene composition further comprises 0-1 part of auxiliary agent.

8. The polypropylene composition according to claim 7, characterized in that The auxiliary agent comprises at least one of antioxidant, light stabilizer.

9. Process for the preparation of a polypropylene composition according to any one of claims 1 to 8, characterized in that, The preparation method comprises the following steps: mixing and melt extruding the components to obtain the polypropylene composition.

10. A spray part comprising the polypropylene composition according to any one of claims 1-8.

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