A modified polypropylene material, its preparation method and use

Abstract

The application discloses a modified polypropylene material and a preparation method and application thereof, and relates to the technical field of polypropylene materials, in particular to a modified polypropylene material, which comprises the following components in parts by weight: 35-75 parts of polypropylene, 20-30 parts of ethylene-propylene-butylene terpolymer polypropylene, 15-25 parts of talcum powder, 2-27 parts of elastomer and 0.2-6 parts of auxiliary agent; the polypropylene comprises high-molecular-weight copolymer polypropylene and low-molecular-weight homopolymer polypropylene at a weight ratio of 1:(0.1-1.6); the high-molecular-weight copolymer polypropylene has a weight average molecular weight of (25-40) ten thousand, and the low-molecular-weight homopolymer polypropylene has a weight average molecular weight of (10-26) ten thousand. The application solves the tiger skin defect of the polypropylene material produced by injection molding by using the combination of specific polypropylene and ethylene-propylene-butylene terpolymer polypropylene, and improves the smell of the polypropylene material produced by injection molding.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of materials, more particularly, to a modified polypropylene material and a preparation method and application thereof. BACKGROUND

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

[0003] With the trend of lightweight and low cost in the development of automobiles, polypropylene with low density, low price and easy processing has been favored by the automobile industry and has been widely used in the manufacture of key parts such as interior and exterior parts, engine parts and electrical system components of automobiles. However, polypropylene material is prone to produce flow marks, commonly known as tiger stripes, when it is prepared into automobile parts by injection molding, which affects the appearance performance of automobile parts and even affects the function of automobile parts. Moreover, the automobile parts prepared by injection molding of polypropylene material have a strong odor, which seriously affects the driving experience of consumers and also adversely affects the health of passengers in the car, so the air quality in the car is also increasingly valued. Patent 202011448705.1 discloses a polypropylene composite material for eliminating ghosting and tiger stripe appearance defects generated during injection molding, which solves the tiger stripe defect of polypropylene material produced by injection molding, but does not improve the odor problem of polypropylene material produced by injection molding.

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

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

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows:

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

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

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

[0010] The high molecular weight copolymer polypropylene has a weight average molecular weight of (25-40) million, and the low molecular weight homopolymer polypropylene has a weight average molecular weight of (10-26) million.

[0011] The present application solves the tiger skin defect of polypropylene material produced by injection molding by using the combination of specific kinds of polypropylene and ethylene-propylene-butylene terpolymer polypropylene, and also improves the odor of polypropylene material produced by injection molding.

[0012] Specifically, in the present application, by controlling the ratio of specific molecular weight high molecular weight copolymer polypropylene and low molecular weight homopolymer polypropylene, the compatibility between polypropylene and ethylene-propylene-butylene terpolymer polypropylene can be improved, which is beneficial to the rubber phase of the condensed elastomer, presents "island structure", promotes the "island island connection" of the rubber phase, and is beneficial to the protection and maintenance of the stability of the elastomer rubber phase structure, while the elastomer rubber phase is 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 larger number of particles [i.e. lower length-diameter ratio (L / D)], so when light is incident on the surface of the product prepared by injection molding of the modified polypropylene material, "diffuse reflection" rather than "specular reflection" occurs, achieving the purpose of solving the tiger skin defect of polypropylene material produced by injection molding.

[0013] In addition, in the present application, by controlling the ratio of specific molecular weight high molecular weight copolymer polypropylene and low molecular weight homopolymer polypropylene, the compatibility between polypropylene and ethylene-propylene-butylene terpolymer polypropylene can be improved, the structure formed by the mutual entanglement of high molecular weight copolymer polypropylene and ethylene-propylene-butylene terpolymer polypropylene can be uniformly distributed in the system, thereby forming a stable and dense network structure, locking or fixing the molecules producing odor, preventing their volatilization, and thereby reducing the odor of polypropylene material produced by injection molding, achieving the purpose of improving the odor of polypropylene material produced by injection molding.

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

[0015] Preferably, the high molecular weight copolymerized polypropylene has a weight average molecular weight of one of 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 high molecular weight copolymerized polypropylene has a weight average molecular weight of (30-35) million.

[0017] Preferably, the low molecular weight homopolymerized polypropylene has a weight average molecular weight of one of 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 low molecular weight homopolymerized polypropylene has a weight average molecular weight of (11-24) million.

[0019] More preferably, the low molecular weight homopolymerized polypropylene has a weight average molecular weight of (19-21) million.

[0020] Preferably, the ethylene-propylene-butylene terpolymerized polypropylene has a weight average molecular weight of (15-30) million, specifically (24-26) million.

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

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

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

[0024] Preferably, the talc has a weight fraction of 18-22 parts.

[0025] Preferably, the auxiliary has a weight fraction of 0.5-6 parts.

[0026] Preferably, the talc has a mesh number of 2500-4000 mesh.

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

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

[0029] The color masterbatch, the antioxidant, the lubricant, and the coupling agent commonly used in the art can be used in the present application.

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

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

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

[0033] More preferably, the weight fraction of the coupling agent is 0.2-1.2 parts, and 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, test condition 230℃, 2.16 kg.

[0035] More preferably, the modified polypropylene material has a melt mass flow rate (MFR) of one 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, 23 g / 10 min, 24 g / 10 min, 25 g / 10 min, 26 g / 10 min, 27 g / 10 min, 28 g / 10 min, 29 g / 10 min, 30 g / 10 min, 31 g / 10 min, 32 g / 10 min, 33 g / 10 min, 34 g / 10 min, 35 g / 10 min, 36 g / 10 min, 37 g / 10 min, 38 g / 10 min, 39 g / 10 min, 40 g / 10 min or a range value between any two of them under the test standard GB / T3682.1-2018, test condition 230℃, 2.16 kg.

[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, test condition 230℃, 2.16 kg.

[0037] In a second aspect, the present application provides a preparation method of the modified polypropylene material, comprising the following steps:

[0038] Mixing the components to obtain the modified polypropylene material.

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

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

[0041] The modified polypropylene material of the present application can be used to prepare interior and exterior parts, engine parts and electrical system components of an automobile.

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

[0043] By using the combination of the specific kind of polypropylene and the ethylene-propylene-butene terpolymer polypropylene, the tiger skin defect of the polypropylene material after injection molding is solved, and the odor of the polypropylene material after injection molding is also improved.

[0044] Specifically, in the present application, by controlling the ratio of the specific molecular weight high molecular weight copolymer polypropylene and the low molecular weight homopolymer polypropylene, the compatibility between the polypropylene and the ethylene-propylene-butene terpolymer polypropylene is improved, which is beneficial to the rubber phase of the condensed elastomer, presents an "island-in-sea structure", promotes the "island-island connection" of the rubber phase, and is beneficial to protecting and maintaining the stability of the elastomer rubber phase structure, while the elastomer rubber phase is uniformly dispersed in the system, thereby ensuring that the modified polypropylene material can still maintain the "island-in-sea structure" after injection molding, and the rubber phase can still present more particles [i.e. low length-diameter ratio (L / D)], so when light is irradiated to the surface of the product prepared by injection molding of the modified polypropylene material, "diffuse reflection" rather than "specular reflection" occurs, thereby solving the tiger skin defect of the polypropylene material after injection molding.

[0045] In addition, in the present application, by controlling the ratio of the specific molecular weight high molecular weight copolymer polypropylene and the low molecular weight homopolymer polypropylene, the compatibility between the polypropylene and the ethylene-propylene-butene terpolymer polypropylene is improved, the structure formed by the mutual entanglement of the high molecular weight copolymer polypropylene and the ethylene-propylene-butene terpolymer polypropylene can be uniformly distributed in the system, thereby forming a stable and dense network structure, locking or fixing the odor molecules, preventing their volatilization, and thereby reducing the odor of the polypropylene material after injection molding, thereby improving the odor of the polypropylene material after injection molding. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 SEM image of the plate molded by the modified polypropylene material of Example 1.

[0047] Figure 2 SEM image of a plate injected with the polypropylene material modified with Comparative Example 2.

[0048] Figure 3 SEM image of a plate injected with the polypropylene material modified with Comparative Example 6.

[0049] Figure 4 Physical image of a plate injected with the polypropylene material modified with Example 1.

[0050] Figure 5 Physical image of a plate injected with the polypropylene material modified with Comparative Example 6.

[0051] Figure 6 Physical image of a mosquito coil-like material injected with the polypropylene material modified with Example 1 before and after aging. DETAILED DESCRIPTION

[0052] In order to better illustrate the purposes, technical solutions and advantages of the present application, the present application will be further described below in combination with specific examples.

[0053] In the following example embodiments, the experimental methods not specified with specific conditions are usually according to the conventional conditions in the field or according to the conditions suggested by the manufacturers; the raw materials, reagents and the like used, if not specifically stated, are all raw materials and reagents that can be obtained through commercial channels such as conventional markets.

[0054] In the embodiments and comparative examples of the present application, the use of reagents is as follows:

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

[0056] PP-B, high molecular weight copolymerized polypropylene, weight average molecular weight is 350,000, PP K9017, Taiwan Chemical;

[0057] PP-1, low molecular weight homopolymerized polypropylene, weight average molecular weight is 190,000, PPH-Y26 (ZHONGKE), CNOOC Petrochemical (Guangdong) Co., Ltd.

[0058] PP-2, low molecular weight homopolymerized polypropylene, weight average molecular weight is 210,000, S2040, Shanghai Sike;

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

[0060] PP-4, low molecular weight homopolymerized polypropylene, weight average molecular weight is 240,000, PP HP500N, CNOOC Petrochemical Co., Ltd.

[0061] PP-5, low molecular weight homopolymer polypropylene, weight average molecular weight is 280,000, HJ4045, Hanwha Oil&Chemical Co., Ltd;

[0062] PP-6, low molecular weight copolymer polypropylene, weight average molecular weight is 210,000, K7100, SINOPEC Yanshan Petrochemical Co., Ltd;

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

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

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

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

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

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

[0069] EPR, ethylene-propylene rubber, EPDM3720P, The Dow Chemical Company;

[0070] Color 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 difference between each other is only the kind and amount of each component is different, calculated by weight fraction, examples 1-9 and comparative examples 1-6 include each component as shown in table 1;

[0077] The preparation method of the modified polypropylene material of examples 1-9 and comparative examples 1-6 includes the following steps:

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

[0079] Table 1 Weight fractions of components in the modified polypropylene materials of Examples 1-9

[0080]

[0081]

[0082]

[0083] Table 2 Weight fractions of components in the modified polypropylene materials of Comparative Examples 1-6

[0084]

[0085]

[0086] Performance test

[0087] The modified polypropylene materials of each example and comparative example are subjected to performance tests, as follows:

[0088] 1. Tiger stripe test:

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

[0090] If the plate does not have tiger stripes, it indicates that the modified polypropylene material solves the tiger stripe defect of the polypropylene material after injection molding;

[0091] 2. Tiger stripe test after aging:

[0092] The modified polypropylene material of Example 1 is injection molded into a mosquito-repellent incense-like material with a thickness of 2.2 mm and a total length of 800 mm, and is subjected to test according to Method B in standard GB / T 16422.2-2014, under the condition that the total light energy is 1240.8 kJ / m 2 , the irradiance at a wavelength of 420 nm is 1.10 W / (m 2 ·nm), and the modified polypropylene material is aged, after which it is photographed to observe whether tiger stripes appear;

[0093] 3. Odor test:

[0094] The odor grade of the modified polypropylene material of each example or comparative example was tested according to the bottle method (dry method, 70°C, sealed for 24h) of GMW3205, the test evaluators were 12 people, the test results were removed the highest odor grade and the lowest odor grade, and the average value was taken as the odor grade of the modified polypropylene material, the test required that the odor grade ≥ 6 levels was the qualified standard, and the specific situation of the odor grade was as follows:

[0095] 1 level indicates unbearable.

[0096] 2 level indicates serious;

[0097] 3 level indicates annoying;

[0098] 4 level indicates unacceptable;

[0099] 5 level indicates unbearable;

[0100] 6 level indicates tolerable;

[0101] 7 level indicates obviously perceptible, but not unacceptable;

[0102] 8 level indicates slight odor;

[0103] 9 level indicates almost no odor;

[0104] 10 level indicates no odor;

[0105] The larger the odor grade, the better the improvement effect of the modified polypropylene material on the odor generated by the injection molding of the polypropylene material;

[0106] 4. Other performance tests:

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

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

[0109] (3) The bending strength and bending modulus of the modified polypropylene material of each example or comparative example were measured by GB / T 9341-2008 standard under the test speed of 2mm / min and the span of 64mm;

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

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

[0112] (7) The heat distortion temperature of the modified polypropylene material of each example or the comparative example was measured by GB / T 1634.2-2004 under the conditions of being placed horizontally and a load of 0.45 MPa;

[0113] The experimental results are shown as follows:

[0114] Table 3: Performance test results of the modified polypropylene material of each example and the comparative example

[0115]

[0116]

[0117] Figure 1 SEM image of a plate material injected with the modified polypropylene material of Example 1. Figure 2 SEM image of a plate material injected with the modified polypropylene material of Comparative Example 2. Figure 3 SEM image of a plate material injected with the modified polypropylene material of Comparative Example 6. Figure 4 Actual image of a plate material injected with the modified polypropylene material of Example 1. Figure 5 Actual image of a plate material injected with the modified polypropylene material of Comparative Example 6. Figure 6 Actual image of a mosquito-repellent material injected with the modified polypropylene material of Example 1 before and after aging.

[0118] From Table 3 and Figures 1-5 It can be seen that, by using the combination of the specific kind of polypropylene and the ethylene-propylene-butylene terpolymer polypropylene, the tiger skin defects generated by the injection molding of the polypropylene material are solved, and the odor generated by the injection molding of the polypropylene material is also improved.

[0119] Specifically, in the present application, by controlling the proportion of the specific molecular weight high molecular weight copolymerized polypropylene and low molecular weight homopolymerized polypropylene, the compatibility between the polypropylene and the ethylene-propylene-butene terpolymerized polypropylene can be improved, thus being beneficial to the rubber phase of the coagulation elastomer, presenting a "sea-island structure", prompting the rubber phase "island-island connection", and being beneficial to protecting and maintaining the stability of the elastomer rubber phase structure, while making the elastomer rubber phase uniformly dispersed in the system, and further ensuring that the modified polypropylene material can still maintain the "sea-island structure" after being injection molded, and the rubber phase can still present more particles [i.e. lower length-diameter ratio (L / D)], so that when light is irradiated to the surface of the product prepared by injection molding of the modified polypropylene material, "diffuse reflection" instead of "specular reflection" occurs, thus achieving the purpose of solving the tiger skin defect of the polypropylene material after injection molding.

[0120] In addition, in the present application, by controlling the proportion of the specific molecular weight high molecular weight copolymerized polypropylene and low molecular weight homopolymerized polypropylene, the compatibility between the polypropylene and the ethylene-propylene-butene terpolymerized polypropylene can be improved, and the structure formed by the mutual entanglement of the high molecular weight copolymerized polypropylene and the ethylene-propylene-butene terpolymerized polypropylene can be uniformly distributed in the system, thus forming a stable and dense network structure, locking or fixing the odor molecules, preventing them from volatilizing, and further reducing the odor generated by the injection molding of the polypropylene material, thus achieving the purpose of improving the odor generated by the injection molding of the polypropylene material.

[0121] In particular, from Example 1 and Comparative Example 2, it can be seen that when the low molecular weight homopolymerized polypropylene is absent, the purpose of improving the odor generated by the injection molding of the polypropylene material cannot be achieved.

[0122] In addition, from Figure 6 It can be seen that the mosquito-repellent material prepared by injection molding of the modified polypropylene material of Example 1 does not present tiger skin before and after aging, indicating that the modified polypropylene material of the present application can still solve the tiger skin defect of the polypropylene material after injection molding.

[0123] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not intended to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A modified polypropylene material, characterized in that, The polypropylene comprises high molecular weight copolymerized polypropylene and low molecular weight homopolymerized polypropylene in a weight ratio of 1:(0.5-0.9). The polypropylene comprises high molecular weight copolymerized polypropylene and low molecular weight homopolymerized polypropylene in a weight ratio of 1:(0.5-0.9). The low molecular weight homopolymerized polypropylene has a weight average molecular weight of (11-24) million. The low molecular weight homopolymerized polypropylene has a weight average molecular weight of (19-21) million.

2. The modified polypropylene material of claim 1, wherein, The high molecular weight copolymerized polypropylene has a weight average molecular weight of (30-35) million.

3. The modified polypropylene material of claim 1, wherein, At least one of the following (1)-(3) is included:

4. The modified polypropylene material of claim 3, wherein the polypropylene is a propylene homopolymer. (1) the weight average molecular weight of the ethylene-propylene-butene terpolymerized polypropylene is (15-30) million; 5. The modified polypropylene material of claim 1, wherein, (2) the molecular weight distribution index of the ethylene-propylene-butene terpolymerized polypropylene is 3-4; 6. The modified polypropylene material of claim 1, wherein, (3) in the ethylene-propylene-butene terpolymerized polypropylene, the weight percentage content of ethylene is 1.0-4.0%, and the weight percentage content of butene is 1.0-8.0%. At least one of the following (1)-(4) is included: (1) the weight percentage of the talc is 18-22 parts; (2) the mesh number of the talc is 2500-4000 mesh; 7. The modified polypropylene material of claim 1, wherein (3) the elastomer comprises at least one of polyolefin elastomer and ethylene-propylene rubber; (4) the weight percentage of the additive is 0.5-6 parts. The additive is at least one of color master batch, antioxidant, lubricant and coupling agent. The modified polypropylene material has a melt mass flow rate of 10-40 g / 10 min under the test standard GB / T3682.1-2018, test condition 230℃, 2.16 kg.

10. The modified polypropylene material according to any one of claims 1-9 is applied in a car.

8. The modified polypropylene material of claim 1, wherein, ​ 9. The modified polypropylene material of claim 1, wherein, ​ ​

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