Modified polypropylene material as well as preparation method and application thereof

Abstract

The invention discloses a modified polypropylene material as well as a preparation method and application thereof, and the modified polypropylene material comprises the following components in parts by weight: 35-75 parts of polypropylene, 20-30 parts of ethylene-propylene-butylene ternary co-polypropylene, 15-25 parts of talcum powder, 2-27 parts of elastomer and 0.2-6 parts of assistant, the polypropylene comprises high molecular weight co-polypropylene and low molecular weight homo-polypropylene in a weight ratio of 1: (0.1-1.6); the weight-average molecular weight of the high-molecular-weight co-polypropylene is 25-40 thousand, and the weight-average molecular weight of the low-molecular-weight homo-polypropylene is 10-26 thousand. By using the combination of specific types of polypropylene and ethylene-propylene-butylene ternary co-polypropylene, the defect of tiger wrinkles generated by injection molding of the polypropylene material is overcome, and the odor generated by injection molding of the polypropylene material is also improved.

Description

Technical Field

[0001] The present invention relates to the field of material technology, and more specifically, to a modified polypropylene material and a preparation method and application thereof. Background Art

[0002] Polypropylene (PP) is a non-polar polymer with excellent chemical stability. In addition to concentrated sulfuric acid and concentrated nitric acid, polypropylene has good chemical corrosion resistance to various other chemical reagents. In addition, polypropylene also has excellent mechanical properties, dielectric properties and electrical insulation, as well as easy processing and molding, low price, low density and other characteristics. Therefore, it is widely used in various fields, especially in the fields of automobiles, medical equipment, textiles, electronic appliances, etc., and has become the fastest-growing general-purpose plastic.

[0003] As the development of automobiles shows a trend of lightweight and low cost, polypropylene with low density, low price and easy processing has been favored by the automotive industry and has been widely used in the manufacture of key parts such as automotive interiors, exteriors, engine components and electrical system components. However, when polypropylene materials are used to prepare automotive parts by injection molding, flow marks, commonly known as tiger stripes, are prone to occur, which affects the appearance performance of automotive parts and even affects the functions of automotive parts. Moreover, the automotive parts prepared by injection molding of polypropylene materials are accompanied by a strong odor, which seriously affects consumers' car-using experience and also has an adverse effect on the health of the occupants in the car, so the air quality in the car has also received more and more attention. Patent 202011448705.1 discloses a polypropylene composite material with the ability to eliminate ghost images and tiger stripes produced during the injection molding process. Although it solves the tiger stripes defect produced by injection molding of polypropylene materials, it does not improve the odor problem produced by injection molding of polypropylene materials.

[0004] Therefore, it is of great economic value to develop a modified polypropylene material to solve the tiger stripe defect produced by injection molding of polypropylene material and improve the odor produced by injection molding of polypropylene material. Summary of the invention

[0005] The purpose of the present invention is to solve the tiger stripe defect produced by injection molding of polypropylene materials in the prior art and to improve the odor problem produced by injection molding of polypropylene materials, and to provide a modified polypropylene material and a preparation method and application thereof.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] In a first aspect, the present invention provides a modified polypropylene material, which comprises the following components, calculated by weight:

[0008] Polypropylene 35-75 parts, ethylene-propylene-butylene terpolymer polypropylene 20-30 parts, talc 15-25 parts, elastomer 2-27 parts, additives 0.2-6 parts;

[0009] The polypropylene comprises a high molecular weight copolymer polypropylene and a low molecular weight homopolymer polypropylene in a weight ratio of 1:(0.1-1.6);

[0010] The weight average molecular weight of the high molecular weight copolymer polypropylene is (250,000-400,000) and the weight average molecular weight of the low molecular weight homopolypropylene is (100,000-260,000).

[0011] The invention solves the tiger-skin pattern defect produced by injection molding of polypropylene materials by using a combination of a specific type of polypropylene and ethylene-propylene-butylene terpolymer polypropylene, and also improves the odor produced by injection molding of polypropylene materials.

[0012] Specifically, in the present invention, by controlling the ratio of high molecular weight copolymer polypropylene with a specific molecular weight and low molecular weight homopolypropylene, the compatibility between polypropylene and ethylene-propylene-butylene terpolymer polypropylene can be improved, which is beneficial to the coagulation of the rubber phase of the elastomer, presenting an "island structure", promoting the "island-to-island connection" of the rubber phase, and is beneficial to protecting and maintaining the stability of the elastomer rubber phase structure, while making the elastomer rubber phase uniformly dispersed in the system, thereby ensuring that the modified polypropylene material can still maintain the "island structure" after injection molding, and the rubber phase can still maintain a relatively large number of particles [i.e., the aspect ratio (L / D) is low]. Therefore, when light is irradiated to the surface of the product prepared by injection molding of the modified polypropylene material, "diffuse reflection" rather than "mirror reflection" will occur, thereby achieving the purpose of solving the tiger stripe defect caused by injection molding of the polypropylene material.

[0013] In addition, in the present invention, by controlling the ratio of high molecular weight copolymer polypropylene with a specific molecular weight and low molecular weight homopolypropylene, the compatibility between polypropylene and ethylene-propylene-butadiene terpolymer polypropylene can be improved, so that the structure formed by the entanglement of high molecular weight copolymer polypropylene and ethylene-propylene-butadiene terpolymer polypropylene can be evenly distributed in the system, thereby forming a stable and dense network structure, locking or fixing the molecules that generate odor to prevent their volatilization, thereby reducing the odor generated by the polypropylene material after injection molding, and achieving the purpose of improving the odor generated by the polypropylene material after injection molding.

[0014] Preferably, the polypropylene comprises high molecular weight copolymer polypropylene and low molecular weight homopolypropylene in a weight ratio of 1:(0.5-0.9).

[0015] Preferably, the weight average molecular weight of the high molecular weight copolymer polypropylene is 250,000, 260,000, 270,000, 280,000, 290,000, 300,000, 310,000, 320,000, 330,000, 340,000, 350,000, 360,000, 370,000, 380,000, 390,000, 400,000, or a range value between any two of them.

[0016] More preferably, the weight average molecular weight of the high molecular weight copolymer polypropylene is (300,000-350,000).

[0017] Preferably, the weight average molecular weight of the low molecular weight homopolypropylene is 100,000, 110,000, 113,000, 115,000, 120,000, 130,000, 140,000, 150,000, 160,000, 170,000, 180,000, 190,000, 200,000, 210,000, 220,000, 230,000, 240,000, 250,000, 260,000, or a range value between any two of them.

[0018] More preferably, the weight average molecular weight of the low molecular weight homopolypropylene is (11-24) ten thousand.

[0019] More preferably, the weight average molecular weight of the low molecular weight homopolypropylene is (190,000-210,000).

[0020] Preferably, the weight average molecular weight of the ethylene-propylene-butylene terpolymer polypropylene is (150,000-300,000), specifically (240,000-260,000).

[0021] More preferably, the molecular weight distribution index of the ethylene-propylene-butylene terpolymer polypropylene is 3-4.

[0022] More preferably, in the ethylene-propylene-butylene terpolymer polypropylene, the weight percentage of ethylene is 1.0-4.0%, and the weight percentage of butene is 1.0-8.0%.

[0023] More preferably, in the ethylene-propylene-butene terpolymer polypropylene, the weight percentage of ethylene is 1.5-3.0%, and the weight percentage of butene is 1.0-7.0%; specifically, the weight percentage of butene is 1.0-6.8%.

[0024] Preferably, the weight proportion of the talc is 18-22 parts.

[0025] Preferably, the weight proportion of the auxiliary agent is 0.5-6 parts.

[0026] Preferably, the mesh size of the talc is 2500-4000 mesh.

[0027] Preferably, the elastomer includes at least one of polyolefin elastomer (POE) and ethylene propylene rubber (EPR).

[0028] Preferably, the auxiliary agent is at least one of a masterbatch, an antioxidant, a lubricant and a coupling agent.

[0029] The masterbatches, antioxidants, lubricants and coupling agents commonly used in the art can be used in the present invention.

[0030] More preferably, the weight proportion of the masterbatch is 0.2-2 parts, specifically 0.5-2 parts.

[0031] More preferably, the weight portion of the antioxidant is 0.2-1.8 parts, specifically 0.8-1.8 parts.

[0032] More preferably, the weight portion of the lubricant is 0.2-0.9 parts, specifically 0.5-0.9 parts.

[0033] More preferably, the weight proportion of the coupling agent is 0.2-1.2 parts, specifically 0.7-1.2 parts.

[0034] Preferably, the modified polypropylene material has a melt mass flow rate (MFR) of 10-40 g / 10 min under the test standard GB / T3682.1-2018 and the test conditions of 230° C. and 2.16 kg.

[0035] More preferably, the modified polypropylene material has a melt mass flow rate (MFR) of 10 g / 10 min, 11 g / 10 min, 12 g / 10 min, 13 g / 10 min, 14 g / 10 min, 15 g / 10 min, 16 g / 10 min, 17 g / 10 min, 18 g / 10 min, 19 g / 10 min, 20 g / 10 min, 21 g / 10 min, 22 g / 10 min under the test standard GB / T3682.1-2018 and the test conditions of 230 ° C and 2.16 kg. , 23g / 10min, 24g / 10min, 25g / 10min, 26g / 10min, 27g / 10min, 28g / 10min, 29g / 10min, 30g / 10min, 31g / 10min, 32g / 10min, 33g / 10min, 34g / 10min, 35g / 10min, 36g / 10min, 37g / 10min, 38g / 10min, 39g / 10min, 40g / 10min or a range value between any two of them.

[0036] More preferably, the modified polypropylene material has a melt mass flow rate (MFR) of 24-28 g / 10 min under the test standard GB / T3682.1-2018 and the test conditions of 230° C. and 2.16 kg.

[0037] In a second aspect, the present invention provides a method for preparing a modified polypropylene material, comprising the following steps:

[0038] The components are mixed to obtain modified polypropylene material.

[0039] Preferably, after mixing the components, the process further comprises melt extrusion, granulation, cooling and drying.

[0040] In a third aspect, the present invention provides an application of a modified polypropylene material in an automobile.

[0041] The modified polypropylene material of the present invention can be used to prepare automotive interior trims, exterior trims, engine components, electrical system components and other parts.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] The invention solves the tiger-skin pattern defect produced by injection molding of polypropylene materials by using a combination of a specific type of polypropylene and ethylene-propylene-butylene terpolymer polypropylene, and also improves the odor produced by injection molding of polypropylene materials.

[0044] Specifically, in the present invention, by controlling the ratio of high molecular weight copolymer polypropylene with a specific molecular weight and low molecular weight homopolypropylene, the compatibility between polypropylene and ethylene-propylene-butylene terpolymer polypropylene can be improved, which is beneficial to the coagulation of the rubber phase of the elastomer, presenting an "island structure", promoting the "island-to-island connection" of the rubber phase, and is beneficial to protecting and maintaining the stability of the elastomer rubber phase structure, while making the elastomer rubber phase uniformly dispersed in the system, thereby ensuring that the modified polypropylene material can still maintain the "island structure" after injection molding, and the rubber phase can still maintain a relatively large number of particles [i.e., the aspect ratio (L / D) is low]. Therefore, when light is irradiated to the surface of the product prepared by injection molding of the modified polypropylene material, "diffuse reflection" rather than "mirror reflection" will occur, thereby achieving the purpose of solving the tiger stripe defect caused by injection molding of the polypropylene material.

[0045] In addition, in the present invention, by controlling the ratio of high molecular weight copolymer polypropylene with a specific molecular weight and low molecular weight homopolypropylene, the compatibility between polypropylene and ethylene-propylene-butadiene terpolymer polypropylene can be improved, so that the structure formed by the entanglement of high molecular weight copolymer polypropylene and ethylene-propylene-butadiene terpolymer polypropylene can be evenly distributed in the system, thereby forming a stable and dense network structure, locking or fixing the molecules that generate odor to prevent their volatilization, thereby reducing the odor generated by the polypropylene material after injection molding, and achieving the purpose of improving the odor generated by the polypropylene material after injection molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a SEM image of a plate injection molded with the modified polypropylene material of Example 1.

[0047] Figure 2 This is a SEM image of a plate injection molded with the modified polypropylene material of Comparative Example 2.

[0048] Figure 3 This is a SEM image of a plate injection molded with the modified polypropylene material of Comparative Example 6.

[0049] Figure 4 This is a physical picture of a plate molded by injection molding using the modified polypropylene material of Example 1.

[0050] Figure 5 This is a physical picture of a plate injection molded with the modified polypropylene material of Comparative Example 6.

[0051] Figure 6 These are actual pictures of the mosquito coil-like material molded from the modified polypropylene material in Example 1 before and after aging. DETAILED DESCRIPTION

[0052] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0053] The experimental methods in the following examples without specifying specific conditions are generally carried out according to conventional conditions in the art or according to conditions recommended by the manufacturer; the raw materials, reagents, etc. used, unless otherwise specified, are all raw materials and reagents that can be obtained from commercial channels such as conventional markets.

[0054] In each embodiment and comparative example of the present invention, the use of reagents is as follows:

[0055] PP-A, high molecular weight copolymer polypropylene, weight average molecular weight 300,000, PP EP548R, CNOOC Shell Petrochemical Co., Ltd.;

[0056] PP-B, high molecular weight copolymer polypropylene, weight average molecular weight of 350,000, PP K9017, Formosa Chemical Corporation;

[0057] PP-1, low molecular weight homopolymer polypropylene, weight average molecular weight of 190,000, PPH-Y26 (ZHONGKE), Zhongke (Guangdong) Refining and Chemical Co., Ltd.;

[0058] PP-2, low molecular weight homopolymer polypropylene, weight average molecular weight of 210,000, S2040, Shanghai Saike;

[0059] PP-3, low molecular weight homopolymer polypropylene, weight average molecular weight of 113,000, PP L5E89, Fushun Petrochemical;

[0060] PP-4, low molecular weight homopolymer polypropylene, weight average molecular weight of 240,000, PP HP500N, CNOOC Shell Petrochemical Co., Ltd.;

[0061] PP-5, low molecular weight homopolymer polypropylene, weight average molecular weight of 280,000, HJ4045, Korea Petrochemical;

[0062] PP-6, low molecular weight copolymer polypropylene, weight average molecular weight of 210,000, K7100, Sinopec Yanshan Petrochemical;

[0063] Ethylene-propylene-butene terpolymer polypropylene-1, weight average molecular weight is 240,000, molecular weight distribution is 3, mass content of ethylene is 3.0%, mass content of butene is 6.8%;

[0064] Ethylene-propylene-butene terpolymer polypropylene-2, weight average molecular weight of 260,000, molecular weight distribution index of 3, weight percentage of ethylene of 1.5%, weight percentage of butene of 1.0%;

[0065] Talc-1, mesh size is 2500 mesh;

[0066] Talc-2, mesh size is 4000 mesh;

[0067] POE-1, polyolefin elastomer, POE7457, Dow Chemical, USA;

[0068] POE-2, polyolefin elastomer, POE7467, Dow Chemical, USA;

[0069] EPR, ethylene propylene rubber, EPDM3720P, Dow, USA;

[0070] Masterbatch, black masterbatch 2718, Cabot;

[0071] Antioxidant-1, hindered phenol, antioxidant 1076, commercially available;

[0072] Antioxidant-2, hindered phenol, antioxidant 1010, commercially available;

[0073] Lubricant, stearic acid, calcium stearate, commercially available;

[0074] Coupling agent, silane, silane coupling agent, KH550, Nanjing Shuguang;

[0075] Examples 1-9 and Comparative Examples 1-6

[0076] Examples 1-9 and Comparative Examples 1-6 provide different modified polypropylene materials, the only difference between them is that the types and amounts of the components are different. Calculated by weight, Examples 1-9 and Comparative Examples 1-6 include the components shown in Table 1;

[0077] The preparation method of the modified polypropylene material of Examples 1-9 and Comparative Examples 1-6 comprises the following steps:

[0078] The components are mixed, melt-extruded at a temperature of (220±5)°C through a twin-screw extruder with a length-to-diameter ratio of 45:1, pelletized, cooled, and dried to obtain a modified polypropylene material;

[0079] Table 1 Weight fractions of each component in the modified polypropylene material of Examples 1-9

[0080]

[0081]

[0082]

[0083] Table 2 Weight parts of each component in the modified polypropylene material of Comparative Examples 1-6

[0084]

[0085]

[0086] Performance Testing

[0087] The performance tests of the modified polypropylene materials of each embodiment and comparative example are as follows:

[0088] 1. Tiger pattern test:

[0089] The modified polypropylene material of each embodiment or comparative example was injection molded into a plate with a thickness of 2.2 mm, and the plate was irradiated with a D65 light source to observe whether tiger stripes appeared on the plate; wherein the injection molding temperature was 230-240° C., the injection molding speed was 45 s, the injection pressure was 45 MPa, the holding pressure was 30 MPa, and the holding time was 8 s;

[0090] If the plate does not have tiger skin pattern, it means that the modified polypropylene material has solved the tiger skin pattern defect caused by injection molding of polypropylene material;

[0091] 2. Tiger skin pattern test after aging:

[0092] The modified polypropylene material of Example 1 was injection molded into a mosquito coil-like material with a thickness of 2.2 mm and a total length of 800 mm. The mosquito coil-like material was tested according to method B in standard GB / T 16422.2-2014. When the total energy of light was 1240.8 kJ / m 2 , the irradiance at 420nm wavelength is 1.10W / (m 2 ·nm) to age the modified polypropylene material. After the test, take photos to see if tiger stripes appear.

[0093] 3. Smell test:

[0094] According to the bottle method of GMW3205 (dry method, sealed at 70°C for 24h), the odor level of the modified polypropylene material of each embodiment or comparative example was tested. There were 12 test assessors. The highest odor level and the lowest odor level were removed from the test results, and the average value was taken as the odor level of the modified polypropylene material. The test required that the odor level ≥ 6 was the qualified standard. The specific situation of the odor level is as follows:

[0095] Level 1 means unbearable.

[0096] Level 2 means severe;

[0097] Level 3 means annoying;

[0098] Level 4 means unacceptable;

[0099] Level 5 means intolerable;

[0100] Level 6 means tolerable;

[0101] Level 7 means clearly noticeable, but not unacceptable;

[0102] Level 8 means slight odor;

[0103] Level 9 means almost no odor;

[0104] 10 means no taste;

[0105] The higher the odor level, the better the effect of the modified polypropylene material on improving the odor generated by injection molding of polypropylene material;

[0106] 4. Other performance tests:

[0107] (1) According to the test standard GB / T3682.1-2018, the melt mass flow rate (MFR) of the modified polypropylene material of each embodiment or comparative example was measured under the test conditions of 230° C. and 2.16 kg;

[0108] (2) The density of the modified polypropylene material of each embodiment or comparative example was measured according to method A in GB / T 1033.1-2008;

[0109] (3) Under the conditions of a test speed of 2 mm / min and a span of 64 mm, the flexural strength and flexural modulus of the modified polypropylene material of each embodiment or comparative example were measured according to GB / T 9341-2008 standard;

[0110] (5) Under the conditions of sample size: 80 mm × 10 mm × 4 mm, pendulum nominal energy: 2.75 J, notch type: type A, and temperature (23 ± 2) ° C, the Izod notch impact strength of the modified polypropylene material of each embodiment or comparative example at room temperature was measured according to GB / T 1843-2008 standard;

[0111] (6) Under the conditions of sample size: 80 mm × 10 mm × 4 mm, pendulum nominal energy: 2.75 J, notch type: type A, and temperature -30 ° C, the Izod notch impact strength of the modified polypropylene material of each embodiment or comparative example at low temperature was measured according to GB / T 1843-2008 standard;

[0112] (7) When placed flat and under a load of 0.45 MPa, the heat deformation temperature of the modified polypropylene material of each embodiment or comparative example of GB / T 1634.2-2004;

[0113] The experimental results are as follows:

[0114] Table 3 Performance test results of modified polypropylene materials in various embodiments and comparative examples

[0115]

[0116]

[0117] Figure 1 This is a SEM image of a plate injection molded with the modified polypropylene material of Example 1. Figure 2 This is a SEM image of a plate injection molded with the modified polypropylene material of Comparative Example 2. Figure 3 This is a SEM image of a plate injection molded with the modified polypropylene material of Comparative Example 6. Figure 4 This is a physical picture of a plate molded by injection molding using the modified polypropylene material of Example 1. Figure 5 This is a physical picture of a plate injection molded with the modified polypropylene material of Comparative Example 6. Figure 6 These are actual pictures of the mosquito coil-like material molded from the modified polypropylene material in Example 1 before and after aging.

[0118] From Table 3 and Figure 1-5 It can be seen that the present invention solves the tiger-skin pattern defect produced by injection molding of polypropylene materials by using a combination of a specific type of polypropylene and ethylene-propylene-butylene terpolymer polypropylene, and also improves the odor produced by injection molding of polypropylene materials.

[0119] Specifically, in the present invention, by controlling the ratio of high molecular weight copolymer polypropylene with a specific molecular weight and low molecular weight homopolypropylene, the compatibility between polypropylene and ethylene-propylene-butylene terpolymer polypropylene can be improved, which is beneficial to the coagulation of the rubber phase of the elastomer, presenting an "island structure", promoting the "island-to-island connection" of the rubber phase, and is beneficial to protecting and maintaining the stability of the elastomer rubber phase structure, while making the elastomer rubber phase uniformly dispersed in the system, thereby ensuring that the modified polypropylene material can still maintain the "island structure" after injection molding, and the rubber phase can still maintain a relatively large number of particles [i.e., the aspect ratio (L / D) is low]. Therefore, when light is irradiated to the surface of the product prepared by injection molding of the modified polypropylene material, "diffuse reflection" rather than "mirror reflection" will occur, thereby achieving the purpose of solving the tiger stripe defect caused by injection molding of the polypropylene material.

[0120] In addition, in the present invention, by controlling the ratio of high molecular weight copolymer polypropylene with a specific molecular weight and low molecular weight homopolypropylene, the compatibility between polypropylene and ethylene-propylene-butadiene terpolymer polypropylene can be improved, so that the structure formed by the entanglement of high molecular weight copolymer polypropylene and ethylene-propylene-butadiene terpolymer polypropylene can be evenly distributed in the system, thereby forming a stable and dense network structure, locking or fixing the molecules that generate odor to prevent their volatilization, thereby reducing the odor generated by the polypropylene material after injection molding, and achieving the purpose of improving the odor generated by the polypropylene material after injection molding.

[0121] In particular, it can be seen from Example 1 and Comparative Example 2 that in the absence of low molecular weight homopolymer polypropylene, the purpose of improving the odor generated by injection molding of polypropylene materials cannot be achieved.

[0122] In addition, from Figure 6 It can be seen that the mosquito coil-like material molded by the modified polypropylene material in Example 1 did not show tiger skin pattern before and after aging, indicating that the modified polypropylene material of the present invention can still solve the tiger skin pattern defect caused by injection molding of polypropylene material after aging.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A modified polypropylene material, characterized in that: Calculated by weight, it includes the following components: Polypropylene 35-75 parts, ethylene-propylene-butadiene terpolymer polypropylene 20-30 parts, talc 15-25 parts, elastomer 2-27 parts, additives 0.2-6 parts; The polypropylene comprises a high molecular weight copolymer polypropylene and a low molecular weight homopolymer polypropylene in a weight ratio of 1:(0.1-1.6); The weight average molecular weight of the high molecular weight copolymer polypropylene is (250,000-400,000) and the weight average molecular weight of the low molecular weight homopolypropylene is (100,000-260,000).

2. The modified polypropylene material according to claim 1, characterized in that: The polypropylene includes high molecular weight copolymer polypropylene and low molecular weight homopolypropylene in a weight ratio of 1:(0.5-0.9).

3. The modified polypropylene material according to claim 1, characterized in that: The weight average molecular weight of the low molecular weight homopolymer polypropylene is (11-24) ten thousand.

4. The modified polypropylene material according to claim 3, characterized in that: The weight average molecular weight of the low molecular weight homopolymer polypropylene is (190,000-210,000).

5. The modified polypropylene material according to claim 1, characterized in that: The weight average molecular weight of the high molecular weight copolymer polypropylene is (300,000-350,000).

6. The modified polypropylene material according to claim 1, characterized in that: Including at least one of the following (1)-(3): (1) The weight average molecular weight of the ethylene-propylene-butylene terpolymer polypropylene is (150,000-300,000); (2) the molecular weight distribution index of the ethylene-propylene-butylene terpolymer polypropylene is 3-4; (3) In the ethylene-propylene-butene terpolymer polypropylene, the weight percentage of ethylene is 1.0-4.0%, and the weight percentage of butene is 1.0-8.0%.

7. The modified polypropylene material according to claim 1, characterized in that: Including at least one of the following (1)-(4): (1) The weight proportion of the talc is 18-22 parts; (2) The mesh size of the talcum powder is 2500-4000 mesh; (3) The elastomer includes at least one of a polyolefin elastomer and an ethylene-propylene rubber; (4) The weight proportion of the auxiliary agent is 0.5-6 parts.

8. The modified polypropylene material according to claim 1, characterized in that: The auxiliary agent is at least one of masterbatch, antioxidant, lubricant and coupling agent.

9. The modified polypropylene material according to claim 1, characterized in that: The modified polypropylene material has a melt mass flow rate of 10-40 g / 10 min under the test standard GB / T3682.1-2018 and the test conditions of 230° C. and 2.16 kg.

10. Use of the modified polypropylene material according to any one of claims 1 to 9 in automobiles.

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