A polypropylene composition, its preparation method and application

Abstract

The present invention discloses a polypropylene composition, a preparation method thereof and an application thereof, belonging to the technical field of polymer materials. The product forms a resin system by introducing a styrene-ethylene-butene-styrene block copolymer and an ethylene-butene copolymer into a polypropylene resin matrix. At the same time, a silicate filler with a specific whiteness and a sorbitol-based clarifying agent are selected for compounding. Under the synergistic effect of each component, the product can not only achieve a high light transmittance, but also has a low shrinkage rate, good low-temperature toughness, and excellent processing performance and service performance.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and particularly relates to a polypropylene composition, a preparation method thereof, and an application thereof. Background Art

[0002] Polypropylene is widely used in fields such as automobiles, electronic products, and household appliances due to its ideal mechanical properties and processing properties. However, when polypropylene materials are used in the automotive field, especially when preparing automotive exterior parts, specific exterior parts require relatively high light transmittance to meet the usage standards. For this reason, people generally introduce a clarifying agent to improve the transparency of the product. However, the clarifying degree of these clarifying agents when used in a small amount is still difficult to meet the usage requirements at present. And introducing a large amount will not only increase the production cost, but may also cause the weakening of other properties.

[0003] On the other hand, the polypropylene substrate needs to have good processing properties and high dimensional stability during the process of being prepared into automotive exterior parts. At the same time, it cannot undergo rapid embrittlement in some low-temperature processing and usage scenarios (such as sub-zero temperature environments), that is, the product is required to have a low shrinkage rate and sufficient low-temperature toughness. Summary of the Invention

[0004] Based on the defects existing in the prior art, the purpose of the present invention is to provide a polypropylene composition. This product forms a highly uniformly dispersed sea-island structure resin system by introducing styrene-ethylene-butene-styrene block copolymer (SEBS) and ethylene-butene copolymer into the polypropylene resin matrix, and at the same time selects a specific high-whiteness silicate-based filler and a sorbitol-based clarifying agent for compounding. Under the synergistic effect of each component, the product can not only achieve a relatively high light transmittance, but also has a low shrinkage rate, good low-temperature toughness, and excellent processing performance and usage performance.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A polypropylene composition, comprising the following components in parts by weight:

[0007] 55-75 parts of polypropylene resin, 10-35 parts of SEBS, 4-12 parts of ethylene-butene copolymer, 5-20 parts of silicate-based filler, 0.1-0.5 part of clarifying agent;

[0008] The whiteness of the silicate-based filler ≥ 94%;

[0009] The clarifying agent is a sorbitol-based clarifying agent.

[0010] Preferably, the test method for the whiteness of the silicate-based filler is to directly test with a whiteness meter.

[0011] The specific test method is as follows: Use the WGB-2A desktop whiteness meter produced by Shanghai Precision Instruments. First, place a light-shielding black cylinder on the measuring port and use the zero-adjusting potentiometer of the instrument to zero. After the zero position of the instrument is stable, remove the black cylinder; place the standard whiteness plate and use the calibration potentiometer of the instrument to adjust the standard whiteness value to calibrate the instrument, and then remove the standard whiteness plate; measure the sample to be tested to determine the whiteness value.

[0012] Because SEBS has good elasticity, it is often used as a toughening agent in plastic products. In the technical solution of the present invention, introducing SEBS as a synergistic component into the polypropylene resin matrix can not only improve the toughness of the product, but also improve the light transmittance of the product to a certain extent. However, the particle sizes of polypropylene resin and SEBS are different microscopically. After melting to form a composite, the uniformity of the two components is insufficient and creep is likely to occur. Therefore, if there are only these two components in the matrix resin of the product, the shrinkage rate of the product is high and the toughness at low temperature is also low. For this reason, in the technical solution of the present invention, a specific content of ethylene-butene copolymer is further introduced as a synergistic component into the composite matrix formed by the above two resins. Through the traction effect of its components on SEBS particles, the uniformity of the product composite resin is increased, forming a highly dispersed sea-island structure. Under the combined action of the three, the dimensional stability and low-temperature toughness of the product can be significantly improved; if other types of toughening agents are used, similar effects cannot be achieved.

[0013] On the other hand, the dimensional stability of the product is related to the content of the filler added. As is well known in the art, too much filler can improve the dimensional stability of the product and the shrinkage rate is low, but the toughness of the product will be relatively reduced, and the compatibility between the organic resin and the inorganic filler will also be reduced. Moreover, with the introduction of the filler, the light transmittance of the product will also be affected. Therefore, in the technical solution of the present invention, after introducing a silicate filler with a specific high whiteness and a sorbitol light transmittance improver as a light transmittance improver at the same time, the shrinkage rate of the product is reduced, and due to the synergistic effect of SEBS and ethylene-butene copolymer, the low-temperature toughness of the product is even higher than that of the unfilled composite resin product, and the light transmittance can be maintained at a relatively high level. If other types of fillers are selected, such as the commonly used titanium-based fillers, even if the whiteness is high, it is still difficult to achieve the ideal light transmittance, and if a silicate filler with insufficient whiteness is used, the light transmittance will be significantly reduced. Similarly, other types of light transmittance improvers cannot play an effective role in this system and cannot balance the light transmittance, shrinkage rate and low-temperature toughness performance of the product.

[0014] Preferably, the weight parts of the polypropylene resin are one of 55 parts, 60 parts, 65 parts, 70 parts, 75 parts or the range value of any two of them, the weight parts of the SEBS are one of 10 parts, 13 parts, 15 parts, 20 parts, 21 parts, 25 parts, 30 parts, 35 parts or the range value of any two of them, the weight parts of the ethylene-butene copolymer are one of 4 parts, 5 parts, 6 parts, 8 parts, 10 parts, 12 parts or the range value of any two of them, the weight parts of the silicate filler are one of 5 parts, 6 parts, 8 parts, 10 parts, 15 parts, 18 parts, 20 parts or the range value of any two of them, and the weight parts of the clarifying agent are one of 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part or the range value of any two of them.

[0015] Preferably, the polypropylene composition comprises the following components in parts by weight:

[0016] 60 - 65 parts of polypropylene resin, 15 - 20 parts of SEBS, 5 - 10 parts of ethylene-butene copolymer, 10 - 15 parts of silicate filler, 0.1 - 0.5 part of clarifying agent.

[0017] Preferably, the mass content of the polypropylene resin in the polypropylene composition is ≥ 45 wt%.

[0018] Preferably, the melt mass flow rate of the polypropylene resin at 230 °C and a load of 2.16 kg according to ISO 1133 - 2011 is 1 - 100 g / 10 min.

[0019] More preferably, the melt mass flow rate of the polypropylene resin at 230 °C and a load of 2.16 kg is 30 - 60 g / 10 min.

[0020] Preferably, the weight-average molecular weight of the SEBS is 20,000 - 120,000;

[0021] More preferably, the weight-average molecular weight of the SEBS is 30,000 - 50,000.

[0022] The test method for the weight-average molecular weight of the SEBS is gel permeation chromatography;

[0023] The specific test method is as follows: Take an appropriate amount of SEBS and dissolve it in tetrahydrofuran. After the obtained solution is filtered through a 0.22 μm filter membrane, use a TDA302 gel permeation chromatograph produced by Viscotek Corporation of the United States to test the weight-average molecular weight. The detectors used are differential refractometer and laser light scattering detector, the eluent is tetrahydrofuran, the flow rate is 1.0 mL / min, the test temperature is 25 °C, the mass concentration during solution testing is 2 - 5 g / L, and the standard sample is polystyrene.

[0024] Preferably, the melt mass flow rate of the SEBS at 230 °C and a load of 2.16 kg according to ISO 1133-2011 is 1 to 15 g / 10 min.

[0025] Preferably, the mass ratio of the SEBS to the ethylene-butene copolymer is (6:1) to (1:1).

[0026] More preferably, the mass ratio of the SEBS to the ethylene-butene copolymer is (4:1) to (3:2).

[0027] Both SEBS and the ethylene-butene copolymer are common toughening agents in the polypropylene-based composite material, but their microscopic particle sizes are different, so their toughening effects are also different. In the technical solution of the present invention, the ratio of the two has a certain influence on the light transmittance, low-temperature toughness and shrinkage rate of the product. Within the above preferred range, the comprehensive performance of the product is better.

[0028] Preferably, the weight-average molecular weight of the ethylene-butene copolymer is 100,000 to 300,000;

[0029] The test method for the weight-average molecular weight of the ethylene-butene copolymer is gel permeation chromatography;

[0030] The test method steps of the ethylene-butene copolymer are the same as those of SEBS.

[0031] More preferably, the weight-average molecular weight of the ethylene-butene copolymer is 150,000 to 250,000.

[0032] As described above, the ethylene-butene copolymer has various functions in the product, and the size of its weight-average molecular weight also has a certain influence on the light transmittance and low-temperature toughness of the product. When within the above preferred range, the light transmittance and low-temperature toughness of the product can reach a higher level.

[0033] Preferably, in the components of the polypropylene composition, 0.5 to 1.5 parts of an ethylene-octene copolymer are further included.

[0034] Preferably, the weight-average molecular weight of the ethylene-octene copolymer is 150,000 to 200,000.

[0035] In polypropylene compositions, ethylene-octene copolymers are more commonly used as compound toughening synergists than ethylene-butene copolymers. The toughness enhancement effect of this component on the product is not much different from that of ethylene-butene copolymers. However, in the product system described in the present invention, after ethylene-octene copolymers are used instead of ethylene-butene copolymers, the light transmittance of the product will be significantly reduced, and the standard performance cannot be achieved. On the basis of the composite system of polypropylene, SEBS, and ethylene-butene copolymers, ethylene-octene copolymers are further introduced for compounding, which can not only ensure that the light transmittance of the product will not decrease significantly, but also further improve the low-temperature toughness of the product and reduce the shrinkage rate, and the comprehensive performance of the product is better.

[0036] Preferably, the silicate filler includes at least one of silicate and aluminosilicate;

[0037] More preferably, the silicate filler is at least one of talc powder, glass fiber powder, mica powder and quartz powder.

[0038] More preferably, the average particle size of the mica and / or talc and / or quartz powder is 8-16 μm.

[0039] More preferably, the glass fiber powder has an average diameter of 10-13 μm and an average length of 20-50 μm.

[0040] More preferably, the average length of the glass fiber powder is 20-30 μm.

[0041] The average particle size of mica and / or talc and / or quartz powder in the silicate filler of the present invention is determined by testing with a laser particle size analyzer with reference to GB / T19077-2016.

[0042] The average length and average diameter of the glass fiber powder in the silicate filler of the present invention are confirmed by the following method: the glass fiber powder is dispersed in water, and after ultrasonic oscillation treatment, the average length and average diameter are statistically confirmed under a second dimension using an optical microscope.

[0043] Preferably, in the polypropylene composition, the retained average particle size of the silicate filler is 4 to 15 μm.

[0044] The retained average particle size of the silicate filler in the polypropylene composition of the present invention is the average particle size of the silicate filler retained in the product after the specified polypropylene composition is melt-extruded and granulated.

[0045] Preferably, in the polypropylene composition, the retained average particle size of mica and / or talc and / or quartz powder is 4-10 μm.

[0046] Preferably, in the polypropylene composition, the retained average particle size of the glass fiber powder is 10-15 μm.

[0047] The test method for the retained average particle size of the silicate filler in the present invention is as follows: calcine the polypropylene composition at 800 °C for 30 min in an air atmosphere, sieve out the ash, and then use a laser particle size analyzer to test and confirm with reference to the laser diffraction method for particle size distribution in GB / T 19077-2016.

[0048] Preferably, the sorbitol-based clarifying agent is at least one of 1,2,3-trideoxy-4,6:5,7-bis-O-[(4-propylphenyl)methylene]-nonitol, 1,3:2,4-di(3,4-dimethylbenzylidene)-D-sorbitol, dibenzylidene sorbitol, and bis(p-methyl dibenzylidene) sorbitol.

[0049] Preferably, the components of the polypropylene composition further include 0.1 to 1 part of an antioxidant and 0.1 to 1 part of a light stabilizer.

[0050] More preferably, the antioxidant is at least one of a hindered phenol antioxidant, a phosphite antioxidant, and a thioester antioxidant.

[0051] More preferably, the antioxidant is a mixture of a hindered phenol antioxidant and a phosphite antioxidant, and the mass ratio of the two is (0.8 to 1.2):(0.8 to 1.2).

[0052] More preferably, the light stabilizer is a hindered amine light stabilizer.

[0053] Preferably, the components of the polypropylene composition further include 0.1 to 3 parts of a processing aid.

[0054] More preferably, the processing aid includes at least one of an antistatic agent, a lubricant, an antibacterial agent, and a colorant.

[0055] It should be noted that among the components of the polypropylene composition of the present invention, according to actual needs, it may include but is not limited to the above-mentioned processing aids. Without affecting the light transmittance, shrinkage rate, and low-temperature toughness of the polypropylene composition, those skilled in the art can select various processing aids to endow the product with other performance effects. For example, in order to endow the product with antistatic properties to achieve safety in the automotive field, an appropriate amount of antistatic agent can be added, and in order to increase the processing efficiency and demolding effect of the product, an appropriate lubricant can be introduced into the product, etc.

[0056] Another object of the present invention is to provide a preparation method of the polypropylene composition, including the following steps:

[0057] Mix the components evenly, and then melt extrude and pelletize in a screw extruder to obtain the polypropylene composition.

[0058] Preferably, when the components are melt-extruded, the temperature zones of the screw extruder are set as follows: zone 1 at 170 - 190°C, zone 2 at 170 - 190°C, zone 3 at 190 - 210°C, zone 4 at 190 - 210°C, zone 5 at 190 - 210°C, zone 6 at 200 - 220°C, zone 7 at 200 - 220°C, zone 8 at 200 - 220°C, zone 9 at 200 - 220°C, zone 10 at 200 - 220°C, the screw speed is 350 - 450 rpm, and the screw length-diameter ratio is (40 - 50):1.

[0059] The preparation method of the polypropylene composition of the present invention is simple in operation, has little demand for equipment, and can realize industrial-scale production.

[0060] Another object of the present invention is to provide the application of the polypropylene composition in the preparation of automotive decorative parts.

[0061] Preferably, the automotive decorative parts include at least one of an integrated illuminated front face, an illuminated tailgate back panel, an illuminated door panel, an illuminated fender, an illuminated trim strip, and an intelligent control panel.

[0062] Another object of the present invention is to provide an automotive decorative part comprising the polypropylene composition of the present invention.

[0063] The polypropylene composition of the present invention has an ideal light transmission effect, and at the same time can achieve extremely low shrinkage rate and low-temperature toughness at a relatively thin size. It has excellent processing performance and use performance, and is very suitable for preparing the above-mentioned automotive decorative parts with related requirements.

[0064] The beneficial effect of the present invention is that the present invention provides a polypropylene composition. By introducing styrene-ethylene-butene-styrene block copolymer (SEBS) and ethylene-butene copolymer into the polypropylene resin matrix and compounding them to form a highly uniformly dispersed sea-island structure resin system, and at the same time selecting specific high-whiteness silicate fillers and sorbitol-based light transmittance improvers for compounding, under the synergistic action of each component, the product can not only achieve a relatively high light transmittance, but also has a low shrinkage rate, good low-temperature toughness, and excellent processing performance and use performance. Specific Embodiments

[0065] In order 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 examples and comparative examples. The purpose is to understand the content of the present invention in detail, rather than to limit the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. The experimental reagents and instruments involved in the implementation of the present invention are all common ordinary reagents and instruments unless otherwise specified.

[0066] Examples 1 - 18

[0067] An embodiment of the polypropylene composition, its preparation method and application according to the present invention is described. The composition components of the polypropylene composition are shown in Table 1.

[0068] The preparation method of the polypropylene composition includes the following steps:

[0069] Mix all components evenly, and then melt extrude and pelletize in a screw extruder to obtain the polypropylene composition.

[0070] When the components are melt extruded, the temperature zones of the screw extruder are set as Zone 1 at 180 °C, Zone 2 at 180 °C, Zone 3 at 200 °C, Zone 4 at 200 °C, Zone 5 at 200 °C, Zone 6 at 210 °C, Zone 7 at 210 °C, Zone 8 at 210 °C, Zone 9 at 210 °C, Zone 10 at 210 °C. The screw speed is 400 rpm, and the screw length-diameter ratio is 48:1.

[0071] Comparative Examples 1 - 10

[0072] The differences between each comparative example and the example are only in the types and ratios of the components, as shown in Table 2.

[0073] Among the components of each example and comparative example,

[0074] The polypropylene resin 1 is PPM60T produced by Zhenhai Refining & Chemical, and its melt flow rate at 230 °C and 2.16 kg load is 55 g / 10 min;

[0075] The polypropylene resin 2 is PP 320 powder produced by Sinopec Maoming, and its melt flow rate at 230 °C and 2.16 kg load is 32 g / 10 min;

[0076] The SEBS 1 is SEBS 1643 produced by Kraton of the United States, and its weight average molecular weight is 40,000;

[0077] The SEBS 2 is SEBS1652 produced by Kraton of the United States, and its weight average molecular weight is 35,000;

[0078] The SBS is SBS1153 produced by Kraton of the United States, and its weight average molecular weight is 40,000;

[0079] The ABS is ABS KF730 produced by Kingfa Science & Technology, and its weight average molecular weight is 55,000;

[0080] The SBR is SBR1605 produced by Dow Chemical, and its weight average molecular weight is 55,000;

[0081] The ethylene-butene copolymer 1 is POE 7457 produced by Dow Chemical, and its weight average molecular weight is 170,000;

[0082] The ethylene-butene copolymer 2 is POE 7447 produced by Dow Chemical, with a weight-average molecular weight of 160,000;

[0083] The ethylene-butene copolymer 3 is POE 7467 produced by Dow Chemical, with a weight-average molecular weight of 240,000;

[0084] The ethylene-butene copolymer 4 is POE9807 produced by Dow Chemical, with a weight-average molecular weight of 110,000;

[0085] The ethylene-butene copolymer 5 is POE 7367 produced by Dow Chemical, with a weight-average molecular weight of 280,000;

[0086] The ethylene-octene copolymer is POE 8842 produced by Dow Chemical, with a weight-average molecular weight of 180,000;

[0087] The glass fiber powder is MF7904 produced by Taishan Fiberglass, with an average diameter of 12 μm, an average length of 25 μm, and a whiteness of 94%;

[0088] The mica powder is W-600 produced by Huajing Mica. After screening, the average particle size is 15 μm and the whiteness is 94%;

[0089] The quartz powder is quartz powder produced by Wuhan Jiyesheng. After screening, the average particle size is 12 μm and the whiteness is 94%;

[0090] The talc powder 1 is BHS1851 produced by Xufeng Powder, with an average particle size of 15 μm and a whiteness of 94% after screening;

[0091] The talc powder 2 is 1250 talc powder produced by Chengnuo Mineral Products Co., Ltd. of Lingshou County. After screening, the average particle size is 12 μm and the whiteness is 90%;

[0092] The montmorillonite is I.3PS produced by NANOCOR of the United States, with an average particle size of 10 μm and a whiteness of 85%;

[0093] The titanium dioxide is TS1511 produced by Chemours, with a whiteness of 95%;

[0094] The anti-fogging agent 1 is NX8000K produced by Milliken, a sorbitol-based anti-fogging agent; 1,2,3-trideoxy-4,6:5,7-bis-O-[(4-propylphenyl)methylene]-nonitol;

[0095] The anti-fogging agent 2 is Millad3988 produced by Milliken, a sorbitol-based anti-fogging agent, 1,3:2,4-bis(3,4-dimethylbenzylidene)-D-sorbitol;

[0096] The anti-reflection agent 3 is NA-21 produced by ADEKA, a metal phosphate;

[0097] The anti-reflection agent 4 is sodium benzoate produced by the Shanxi Research Institute of Chemical Industry;

[0098] The antioxidant is a mixture prepared by compounding a commercially available hindered phenol antioxidant and a phosphite antioxidant in a mass ratio of 1:1;

[0099] The light stabilizer is a commercially available hindered amine light stabilizer.

[0100] Unless otherwise specified, the component raw materials used in the examples and comparative examples of the present invention are all commercially available raw materials, and the component raw materials used in each parallel experiment are of the same kind.

[0101] The test method for the average retained particle size of the filler in each product in the examples and comparative examples is as follows: calcine each product in air at 800 °C for 30 min, then sieve the ash, and use a laser particle size analyzer to test and confirm with reference to the laser diffraction method for particle size distribution in GB / T 19077-2016.

[0102] Table 1

[0103]

[0104] Table 2

[0105]

[0106] In order to verify the performance of the polypropylene composition described in the present invention, the products prepared in each example and comparative example were subjected to the following performance tests, and the specific steps are as follows:

[0107] (1) Transmittance test: Inject each product into a test square plate of 100*100*3 mm, and then test according to GB 2410-2008;

[0108] (2) Low-temperature toughness test: Test according to ISO 180-2019, the test temperature is -30 °C, and the A-type notch;

[0109] (3) Shrinkage rate test: Inject each product into a test square plate of 200*200*1 mm, let it stand at room temperature for 24 h, then measure the length of the test square plate and record it as A mm, and calculate the shrinkage rate of the product: 100%×(200 - A) / 200.

[0110] The test results are shown in Tables 3 and 4.

[0111] Table 3

[0112]

[0113] Table 4

[0114]

[0115] As can be seen from Table 3 and Table 4, the polypropylene composition described in the present invention forms a highly dispersed sea-island structure system by introducing SEBS and ethylene-butene copolymer into the matrix resin, and at the same time, special fillers and clarifiers are used, so that the product not only has ideal light transmittance, with the light transmittance reaching 60% or more, but also has a low shrinkage rate of 1.1% or less at a relatively thin size, high low-temperature toughness, and the notched impact strength at -30°C can reach at least 5 KJ / m 2 , and the comprehensive performance is excellent. As can be seen from Example 1 and Examples 3 to 5, the compounding ratio of SEBS and ethylene-butene copolymer forming the sea-island structure affects the various properties of the product. As the proportion of SEBS increases, the low-temperature toughness and dimensional stability of the product are improved. When the ratio of the two is in the range of (4:1) to (3:2), the product can achieve a higher light transmittance. On the other hand, the molecular weight of the ethylene-butene copolymer also affects its dispersibility in the product and the improvement of the product's properties. As can be seen from Example 1 and Examples 8 to 11, when the molecular weight of the ethylene-butene copolymer increases, the light transmittance, low-temperature toughness and dimensional stability of the product all change. When the weight-average molecular weight of the ethylene-butene copolymer is maintained in the range of 150,000 to 250,000, the comprehensive performance of the product is better. At the same time, if a part of ethylene-octene copolymer is introduced into the product system, as shown in Examples 12 to 14, the low-temperature toughness of the product can be further improved and the shrinkage rate of the product can be reduced while maintaining a high light transmittance.

[0116] In contrast, in the product of Comparative Example 1, only a single ethylene-butene copolymer was introduced into the matrix resin, and no resin sea-island structure was formed. Therefore, the dimensional stability could not be guaranteed, and the light transmittance of the product under the compounding of a single ethylene-butene copolymer was low. If the SEBS in the product is replaced with other types of reinforcing resins commonly used by those skilled in the art, as shown in Comparative Examples 2 to 4, not only the light transmittance of the product cannot reach the expected value, but even the low-temperature toughness is low. The notched impact strength of the product in Comparative Example 4 at -30°C is only 4.5 KJ / m 2; Meanwhile, in the technical solution of the present application, the ethylene copolymer obtained from SBES must be an ethylene-butene copolymer. If it is replaced with an ethylene-butene copolymer, as shown in Comparative Example 5, the light transmittance of the product is extremely low. Although the fillers used in the products of Comparative Examples 6 and 7 are close to those of the example products in terms of size and type, their whiteness is insufficient; although the filler used in the product of Comparative Example 8 has a high whiteness, it is not a silicate filler. The light transmittances of the three products do not meet the usage requirements, and the low-temperature toughness of the product of Comparative Example 9 is also low. In the products of Comparative Examples 9 and 10, the clarifying agent is replaced with other types not defined in the present invention. In addition to the decrease in light transmittance, the low-temperature toughness and dimensional stability of the products are also difficult to meet the standards, indicating that in the products of the present invention, in addition to affecting the light transmittance of the products, the clarifying agent also has a great influence on the filler dispersibility and shrinkage of the products.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A polypropylene composition, characterized in that The composition comprises the following components in parts by weight: 60-65 parts of polypropylene resin, 13-21 parts of SEBS, 4-12 parts of ethylene-butene copolymer, 10-15 parts of silicate filler, 0.2-0.3 parts of permeability enhancer; The whiteness of the silicate filler is ≥94%; The permeation enhancer is a sorbitol-based permeation enhancer.

2. The polypropylene composition according to claim 1, characterized in that The polypropylene resin has a melt mass flow rate of 1 to 100 g / 10 min at 230° C. and a load of 2.16 kg according to ISO1133-2011.

3. The polypropylene composition according to claim 1, characterized in that The weight average molecular weight of the SEBS is 20,000-120,000.

4. The polypropylene composition according to claim 1, characterized in that The mass ratio of the SEBS to the ethylene-butene copolymer is (6:1) to (1:1).

5. The polypropylene composition according to claim 1, characterized in that The weight average molecular weight of the ethylene-butene copolymer is 100,000-300,000.

6. The polypropylene composition according to claim 1, characterized in that The components of the polypropylene composition also include 0.5 to 1.5 parts of ethylene-octene copolymer.

7. The polypropylene composition according to claim 1, characterized in that The silicate filler includes silicate.

8. The polypropylene composition according to claim 7, characterized in that The silicate filler is at least one of talcum powder, glass fiber powder, mica powder and quartz powder.

9. The polypropylene composition according to claim 8, characterized in that The average particle size of the mica and / or talc powder and / or quartz powder is 8-16 μm; the average diameter of the glass fiber powder is 10-13 μm, and the average length is 20-50 μm.

10. The polypropylene composition according to claim 1, characterized in that The components of the polypropylene composition also include 0.1 to 1 part of an antioxidant and 0.1 to 1 part of a light stabilizer; the antioxidant is at least one of a hindered phenol antioxidant, a phosphite antioxidant, and a thioester antioxidant; and the light stabilizer is a hindered amine light stabilizer.

11. The method for preparing the polypropylene composition according to any one of claims 1 to 10, characterized in that: The following steps are involved: The components are mixed uniformly and then melt-extruded and granulated in a screw extruder to obtain the polypropylene composition.

12. Use of the polypropylene composition according to any one of claims 1 to 10 in the preparation of automotive decorative parts.

13. The use according to claim 12, characterized in that The automobile decorative parts include at least one of an integrated luminous front face, a luminous tailgate back panel, a luminous door panel, a luminous fender, a luminous trim, and an intelligent control panel.

14. An automobile decorative component, characterized in that: The invention comprises the polypropylene composition according to any one of claims 1 to 10.

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