Polypropylene composition, and preparation method therefor and use thereof

Abstract

The present invention belongs to the technical field of high polymer materials, and discloses a polypropylene composition, and a preparation method therefor and the use thereof. In the product, a resin system is formed by introducing a styrene-ethylene-butylene-styrene block copolymer and an ethylene-butylene copolymer into a polypropylene resin matrix; moreover, a silicate-based filler having a specific whiteness and a sorbitol-based clarifying agent are selected for compounding; and under the synergistic effect of all the components, the product not only achieves a high light transmittance, but also exhibits a low shrinkage, good low-temperature toughness, good processability, and good performance in use.

Description

A polypropylene composition, its preparation method and application Technical Field

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

[0002] Polypropylene is widely used in the automotive, electronics, and home appliance industries due to its ideal mechanical and processing properties. However, when polypropylene is used in the automotive sector, especially in the manufacture of automotive exterior parts, certain parts require high light transmittance to meet usage standards. Therefore, anti-reflective agents are typically introduced to improve the product's transparency. However, using small amounts of these anti-reflective agents is currently insufficient to meet usage requirements, while large-scale introduction of anti-reflective agents, besides increasing production costs, may also weaken other product properties.

[0003] On the other hand, polypropylene materials need to have good processing performance and high dimensional stability when they are made into automotive exterior parts. At the same time, they cannot become brittle rapidly in some low-temperature processing and use scenarios (such as sub-zero temperature environments), which means that the products are required to have low shrinkage and sufficient low-temperature toughness. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a polypropylene composition. This product is formulated by introducing styrene-ethylene-butene-styrene block copolymer (SEBS) and ethylene-butene copolymer into a polypropylene resin matrix to form a highly uniformly dispersed island-type resin system. Simultaneously, specific high-whiteness silicate fillers and sorbitol-based brighteners are selected for formulation. Under the synergistic effect of each component, the product not only achieves high light transmittance but also exhibits low shrinkage, good low-temperature toughness, and excellent processing and performance characteristics.

[0005] To achieve the above objectives, 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 polypropylene resin, 10-35 parts SEBS, 4-12 parts ethylene-butene copolymer, 5-20 parts silicate filler, and 0.1-0.5 parts clarity enhancer;

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

[0009] The penetration enhancer is a sorbitol-based penetration enhancer.

[0010] Preferably, the whiteness of the silicate filler is tested directly using a whiteness meter.

[0011] The specific test method for the whiteness of the silicate filler is as follows: Using a WGB-2A benchtop whiteness meter manufactured by Shanghai Precision Instruments Co., Ltd., first place the light-shielding black tube on the measuring hole and zero the instrument with the zero-adjustment potentiometer. After the instrument is at zero stable, remove the black tube; place the standard whiteness plate on it and adjust the standard whiteness value with the instrument calibration potentiometer to calibrate the instrument, and then remove the standard whiteness plate; measure the sample to be tested and determine the whiteness value.

[0012] SEBS is often used as a toughening agent in plastic products due to its good elasticity. In this invention, SEBS is introduced as a synergistic component into the polypropylene resin matrix, which not only improves the product's toughness but also enhances its light transmittance to some extent. However, polypropylene resin and SEBS have different microscopic particle sizes. After melting to form a composite, the uniformity of the two components is insufficient, and creep is likely to occur. Therefore, if the matrix resin of the product contains only these two components, the product has a high shrinkage rate and low toughness at low temperatures. To address this, this invention further introduces a specific amount of ethylene-butene copolymer as a synergistic component into the composite matrix formed by the two resins. Through the traction effect of this component on the SEBS particles, the uniformity of the composite resin increases, forming a highly dispersed island structure. Under the combined effect of these three components, the dimensional stability and low-temperature toughness of the product are significantly improved; similar effects cannot be achieved by using other types of toughening agents.

[0013] On the other hand, the dimensional stability of the product is somewhat correlated with the amount of filler added. It is known in the art that excessive filler can improve the dimensional stability and reduce shrinkage, but it also reduces the toughness of the product and decreases the compatibility between organic resins and inorganic fillers. Furthermore, the light transmittance of the product is also affected by the introduction of filler. Therefore, in the technical solution of this invention, by simultaneously introducing a specific high-whiteness silicate filler combined with a sorbitol-based brightening agent, the shrinkage rate of the product is reduced. Moreover, due to the synergistic effect of SEBS and ethylene-butene copolymer, the low-temperature toughness of the product is actually higher than that of the unfilled composite resin product, and the light transmittance can be maintained at a high level. If other types of fillers are selected, such as the commonly used titanium-based fillers, even with high whiteness, it is still difficult to achieve the ideal light transmittance; while using silicate fillers with insufficient whiteness will significantly reduce the light transmittance. Similarly, other types of brightening agents cannot play an effective role in this system and cannot simultaneously achieve the desired light transmittance, shrinkage rate, and low-temperature toughness.

[0014] Preferably, the polypropylene resin is in the range of 55 parts, 60 parts, 65 parts, 70 parts, 75 parts by weight, or any two of these values; the SEBS is in the range of 10 parts, 13 parts, 15 parts, 20 parts, 21 parts, 25 parts, 30 parts, 35 parts by weight, or any two of these values; the ethylene-butene copolymer is in the range of 4 parts, 5 parts, 6 parts, 8 parts, 10 parts, 12 parts by weight, or any two of these values; the silicate filler is in the range of 5 parts, 6 parts, 8 parts, 10 parts, 15 parts, 18 parts, 20 parts by weight, or any two of these values; and the penetration enhancer is in the range of 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts by weight, or any two of these values.

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

[0016] The mixture contains 60-65 parts polypropylene resin, 15-20 parts SEBS, 5-10 parts ethylene-butene copolymer, 10-15 parts silicate filler, and 0.1-0.5 parts clarity enhancer.

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

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

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

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

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

[0022] The weight-average molecular weight of the SEBS was determined by gel permeation chromatography.

[0023] The specific method for testing the weight-average molecular weight of SEBS is as follows: An appropriate amount of SEBS is dissolved in tetrahydrofuran. The resulting SEBS solution is filtered through a 0.22 μm pore size filter membrane and then subjected to weight-average molecular weight testing using a TDA302 gel permeation chromatograph manufactured by Viscotek, USA. The detector used is a differential and laser scattering detector. The eluent is tetrahydrofuran, the flow rate is 1.0 mL / min, the test temperature is 25 °C, the mass concentration of the SEBS solution during testing is 2–5 g / L, and the standard is polystyrene.

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

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

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

[0027] SEBS and ethylene-butene copolymer are both common toughening agents in polypropylene-based composites, but their microscopic particle sizes are different, resulting in different toughening effects. In the technical solution of this invention, the ratio of the two has a certain impact on the product's light transmittance, low-temperature toughness, and shrinkage rate. Within the aforementioned preferred range, the product exhibits superior overall performance.

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

[0029] The weight-average molecular weight of the ethylene-butene copolymer was determined by gel permeation chromatography.

[0030] The test method for the ethylene-butene copolymer is the same as that for SEBS.

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

[0032] As mentioned above, ethylene-butene copolymers play multiple roles in the product, and their weight-average molecular weight also has a certain impact on the product's light transmittance and low-temperature toughness. When within the above-mentioned preferred range, the product's light transmittance and low-temperature toughness can reach a higher level.

[0033] Preferably, the polypropylene composition further includes 0.5 to 1.5 parts of ethylene-octene copolymer.

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

[0035] In polypropylene compositions, ethylene-octene copolymer is more commonly used as a toughening synergist than ethylene-butene copolymer. While its toughness-enhancing effect is not significantly different from that of ethylene-butene copolymer, in the product system described in this invention, replacing ethylene-butene copolymer with ethylene-octene copolymer significantly reduces the product's light transmittance, failing to meet performance standards. However, by further introducing ethylene-octene copolymer into the polypropylene, SEBS, and ethylene-butene copolymer composite system, not only can the light transmittance not decrease significantly, but the low-temperature toughness and shrinkage rate can also be further improved, resulting in better overall product performance.

[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 powder and / or talc powder and / or quartz powder is 8 to 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 powder and / or talc powder and / or quartz powder in the silicate filler of the present invention was confirmed by laser particle size analyzer in accordance with the Chinese national standard GB / T19077-2016.

[0042] The average length and average diameter of the glass fiber powder in the silicate filler of the present invention were confirmed by the following method: the glass fiber powder was dispersed in water, treated with ultrasonic oscillation, and then statistically confirmed using a two-dimensional measuring instrument.

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

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

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

[0046] Preferably, in the polypropylene composition, the average retained 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 of the present invention is as follows: calcining the polypropylene composition at 800°C for 30 min in an air atmosphere, sieving the ash content, and then confirming it by laser particle size analyzer according to the Chinese national standard GB / T19077-2016 Particle Size Distribution Laser Diffraction Method.

[0048] Preferably, the sorbitol-based penetrant is at least one of 1,2,3-trideoxy-4,6:5,7-bis-O-[(4-propenyl)methylene]-nonanol, 1,3:2,4-bis(3,4-dimethylbenzyl)-D-sorbitol, diphenylmethylene sorbitol, and di(p-methyldiphenylmethylene)sorbitol.

[0049] Preferably, the polypropylene composition further includes 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 hindered phenolic antioxidants, phosphite antioxidants, and thioester antioxidants.

[0051] More preferably, the antioxidant is a mixture of hindered phenolic antioxidants and phosphite antioxidants, with a mass ratio of (0.8-1.2):(0.8-1.2).

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

[0053] Preferably, the polypropylene composition further includes 0.1 to 3 parts of processing aids.

[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 the polypropylene composition described in this invention may include, but is not limited to, the processing aids mentioned above, depending on actual needs. Without affecting the light transmittance, shrinkage, and low-temperature toughness of the polypropylene composition, those skilled in the art can select various processing aids to impart other performance effects to the product. For example, to impart antistatic properties to the product and thus achieve safety in the automotive field, an appropriate amount of antistatic agent can be added to the product; and to increase the processing efficiency and demolding effect of the product, a suitable lubricant can be introduced into the product, etc.

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

[0057] The components are mixed evenly, and then melt-extruded and granulated in a screw extruder to obtain the polypropylene composition.

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

[0059] The preparation method of the polypropylene composition of the present invention is simple to operate, requires little equipment, and can achieve industrial-scale production.

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

[0061] Preferably, the automotive decorative components include at least one of the following: an integrated illuminated front fascia, 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 trim component comprising the polypropylene composition described herein.

[0063] The polypropylene composition of this invention has ideal light transmission, while achieving extremely low shrinkage and low-temperature toughness at a relatively thin size. It also has excellent processing and performance characteristics, making it very suitable for the preparation of automotive decorative parts with the aforementioned requirements.

[0064] The beneficial effects of this invention are that it provides a polypropylene composition. This product is formed by introducing styrene-ethylene-butene-styrene block copolymer (SEBS) and ethylene-butene copolymer into a polypropylene resin matrix to form a highly uniformly dispersed island-shaped resin system. At the same time, specific high-whiteness silicate fillers and sorbitol-based brighteners are selected for compounding. Under the synergistic effect of each component, the product can not only achieve high light transmittance, but also has low shrinkage, good low-temperature toughness, and excellent processing and performance. Detailed Implementation

[0065] To better illustrate the purpose, technical solution, and advantages of this invention, the invention will be further described below with reference to specific embodiments and comparative examples. The purpose of this description is to provide a detailed understanding of the invention, not to limit its scope. All other embodiments obtained by those skilled in the art without inventive effort are within the protection scope of this invention. Unless otherwise specified, the experimental reagents and instruments involved in the implementation of this invention are commonly used reagents and instruments.

[0066] Examples 1-18

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

[0068] The method for preparing the polypropylene composition includes the following steps:

[0069] The components are mixed evenly, and then melt-extruded and granulated in a screw extruder to obtain the polypropylene composition.

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

[0071] Comparative Examples 1-10

[0072] The only difference between each comparative example and the embodiment is the type and ratio of components, as shown in Table 2.

[0073] In the components described in each embodiment and comparative example,

[0074] The polypropylene resin 1 is PP M60T produced by Zhenhai Refining & Chemical Branch of China Petroleum & Chemical Corporation, with a melt flow rate of 55g / 10min at 230℃ and 2.16kg load.

[0075] The polypropylene resin 2 is PP 320 powder produced by Maoming Petrochemical Co., Ltd. of China Petroleum & Chemical Corporation, with a melt flow rate of 32 g / 10 min at 230℃ and 2.16 kg load.

[0076] The styrene-ethylene-butene-styrene block copolymer 1 (SEBS1) is SEBS1643 produced by Kraton Pharmaceuticals, Inc., with a weight-average molecular weight of 40,000 g / mol.

[0077] The styrene-ethylene-butene-styrene block copolymer 2 (SEBS2) is SEBS1652 manufactured by Kraton in the United States, with a weight-average molecular weight of 35,000.

[0078] The styrene-butadiene-styrene copolymer (SBS) is SBS1153 produced by Kraton Pharmaceuticals, Inc., with a weight-average molecular weight of 40,000 g / mol.

[0079] The acrylonitrile-butadiene-styrene copolymer (ABS) is ABS KF730 produced by China Kingfa Science & Technology Co., Ltd., with a weight-average molecular weight of 55,000 g / mol;

[0080] The styrene-butadiene copolymer (SBR) is SBR1605 produced by Dow Chemical Company, USA, with a weight-average molecular weight of 55,000 g / mol;

[0081] The ethylene-butene copolymer 1 is POE 7457 produced by Dow Chemical Company, USA, with a weight-average molecular weight of 170,000 g / mol;

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

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

[0084] The ethylene-butene copolymer 4 is POE 9807 produced by Dow Chemical Company, USA, with a weight-average molecular weight of 110,000 g / mol;

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

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

[0087] The glass fiber powder is MF7904 produced by China Taishan Glass Fiber Co., Ltd., with an average diameter of 12μm, an average length of 25μm, and a whiteness of 94%.

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

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

[0090] The talc powder 1 is BHS1851 produced by Quanzhou Xufeng Powder Raw Material Co., Ltd. in China. After screening, the average particle size is 15μm and the whiteness is 94%.

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

[0092] The montmorillonite mentioned is 1.3PS produced by NANOCOR in the United States, with an average particle size of 10μm and a whiteness of 85%.

[0093] The titanium dioxide is TS1511 produced by Chemours, Inc. of the United States, with a whiteness of 95%.

[0094] The solubilizing agent 1 is NX8000K, a sorbitol-based solubilizing agent manufactured by Milliken Laboratories, Inc.; 1,2,3-trideoxy-4,6:5,7-bis-O-[(4-propanylphenyl)methylene]-nonanol;

[0095] The solubilizer 2 is Millad 3988, a sorbitol-based solubilizer, manufactured by Milliken Laboratories, USA, specifically 1,3:2,4-di(3,4-dimethylbenzylene)-D-sorbitol.

[0096] The brightening agent 3 is NA-21, a metal phosphate, manufactured by Idico Corporation of Japan.

[0097] The penetrating agent 4 is sodium benzoate produced by Shanxi Provincial Chemical Research Institute;

[0098] The antioxidant is a mixture of commercially available hindered phenolic antioxidants and phosphite antioxidants in a mass ratio of 1:1;

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

[0100] Unless otherwise specified, all components and raw materials used in the embodiments and comparative examples of this invention are commercially available, and the same type of components and raw materials are used in each parallel experiment.

[0101] The test method for the retention average particle size of the filler in each product in the embodiments and comparative examples is as follows: each product is calcined in air at 800°C for 30 minutes, and then the ash content is sieved and confirmed by laser particle size analyzer according to the Chinese national standard GB / T19077-2016 Particle Size Distribution Laser Diffraction Method.

[0102] Table 1

[0103] Table 2

[0104] To verify the performance of the polypropylene composition described in this invention, the products prepared in each embodiment and comparative example were subjected to the following performance tests, with the specific steps as follows:

[0105] (1) Light transmittance test: Each product was injection molded into a test square plate of 100×100×3mm, and then tested according to Chinese national standard GB 2410-2008;

[0106] (2) Low temperature toughness test: The test was conducted according to ISO 180-2019 standard at a test temperature of -30℃ with a type A notch.

[0107] (3) Shrinkage test: Each product was injection molded into a test square plate of 200×200×1mm and left to stand at room temperature for 24h. The length of the square plate was then tested and recorded as Amm. The shrinkage rate of the product was calculated as: 100%×(200-A) / 200.

[0108] The test results are shown in Tables 3 and 4.

[0109] Table 3

[0110] Table 4

[0111] As can be seen from Tables 3 and 4, the polypropylene composition of this invention is based on the introduction of SEBS and ethylene-butene copolymer into the resin matrix to form a highly dispersed island structure system. Combined with special fillers and brighteners, this results in a product that not only has ideal light transmittance (60% or higher), but also exhibits low shrinkage (only 1.1% or less) even at thinner dimensions, and high low-temperature toughness (notched impact strength at -30°C can reach at least 5 KJ / m). 2The product exhibits excellent overall performance. As can be seen from Examples 1 and 3-5, the blending ratio of SEBS and ethylene-butene copolymer forming the island structure affects various properties of the product. With an increase in the proportion of SEBS, the product's low-temperature toughness and dimensional stability improve, while a ratio between (4:1) and (3:2) results in higher light transmittance. On the other hand, the molecular weight of the ethylene-butene copolymer also affects its dispersibility in the product and its performance enhancement. As can be seen from Examples 1 and 8-11, increasing the molecular weight of the ethylene-butene copolymer alters the product's light transmittance, low-temperature toughness, and dimensional stability. When the weight-average molecular weight of the ethylene-butene copolymer is maintained within the range of 150,000 to 250,000 g / mol, the product's overall performance is superior. Furthermore, introducing a portion of ethylene-octene copolymer into the product system, as shown in Examples 12-14, can further improve the product's low-temperature toughness and reduce its shrinkage while maintaining high light transmittance.

[0112] In contrast, in Comparative Example 1, only a single ethylene-butene copolymer was introduced into the resin matrix without forming a resin island structure. Therefore, dimensional stability could not be guaranteed, and the product with only ethylene-butene copolymer had low light transmittance. Furthermore, if the SEBS in the product was replaced with other types of reinforcing resins commonly used by those skilled in the art, as shown in Comparative Examples 2-4, not only did the light transmittance fail to meet expectations, but the low-temperature toughness was also low. The notched impact strength of Comparative Example 4 at -30°C was only 4.5 KJ / m. 2 Meanwhile, in the technical solution of this application, the ethylene copolymer compounded with 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 Comparative Examples 6 and 7 are similar in size and type to those in the examples, their whiteness is insufficient. Although the filler used in Comparative Example 8 has higher whiteness, it is not a silicate filler. The light transmittance of all three products does not meet the requirements, and the low-temperature toughness of Comparative Example 8 is also low. In Comparative Examples 9 and 10, the anti-reflective agent was replaced with other types not limited to this invention. In addition to the reduced light transmittance, the low-temperature toughness and dimensional stability of the products are also difficult to meet the standards. This indicates that in the products described in this invention, the anti-reflective agent not only affects the light transmittance of the product, but also has a significant impact on the dispersibility and shrinkage of the filler.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A polypropylene composition, characterized in that, Includes the following components in parts by weight: 55-75 parts polypropylene resin, 10-35 parts styrene-ethylene-butene-styrene block copolymer (SEBS), 4-12 parts ethylene-butene copolymer, 5-20 parts silicate filler, and 0.1-0.5 parts clarity enhancer; The whiteness of the silicate filler is ≥94%; The penetration enhancer is a sorbitol-based penetration enhancer.

2. The polypropylene composition according to claim 1, characterized in that, The polypropylene resin, according to ISO 1133-2011 standard, has a melt flow rate of 1–100 g / 10 min at 230°C and 2.16 kg load.

3. The polypropylene composition according to claim 1 or 2, characterized in that, The mass ratio of SEBS to ethylene-butene copolymer is (6:1) to (1:1).

4. The polypropylene composition according to any one of claims 1-3, characterized in that, The ethylene-butene copolymer has a weight-average molecular weight of 100,000 to 300,000.

5. The polypropylene composition according to any one of claims 1-4, characterized in that, The polypropylene composition further includes 0.5 to 1.5 parts of ethylene-octene copolymer.

6. The polypropylene composition according to any one of claims 1-5, characterized in that, The silicate filler includes at least one of silicate and aluminosilicate.

7. The polypropylene composition according to claim 6, characterized in that, The silicate filler is at least one of talc powder, glass fiber powder, mica powder, and quartz powder.

8. The polypropylene composition according to claim 7, characterized in that, The average particle size of the mica powder 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.

9. The polypropylene composition according to any one of claims 1-8, characterized in that, The polypropylene composition further includes 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 hindered phenolic antioxidants, phosphite antioxidants, and thioester antioxidants; the light stabilizer is a hindered amine light stabilizer.

10. The polypropylene composition according to any one of claims 1-9, characterized in that, The weight-average molecular weight of the SEBS is 20,000 to 120,000 g / mol.

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

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

13. The application as described in claim 12, characterized in that, The automotive decorative components include at least one of the following: an integrated illuminated front fascia, an illuminated tailgate back panel, an illuminated door panel, an illuminated fender, an illuminated trim strip, and an intelligent control panel.

14. A type of automotive decorative component, characterized in that, Includes the polypropylene composition according to any one of claims 1 to 10.

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