Polypropylene composite material as well as preparation method and application thereof
By adding modifiers to polypropylene materials, the problem of insufficient surface tension, thermal stability and scratch resistance in automotive interior parts is solved, and higher surface tension, thermal stability and resistance are achieved Scratch performance.
Patent Information
- Application Number
- CN202411737119.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-02-11
AI Technical Summary
When polypropylene materials are used in automotive interior parts, there are problems such as insufficient surface tension, thermal stability and scratch resistance, resulting in problems such as poor adhesive or falling off.
Modifier is added to polypropylene to increase surface tension through amide groups, polar fragments enhance lubricating performance, and carbon-sulfur bonds decompose hydroperoxides to improve thermal stability.
On the premise of ensuring mechanical properties, the surface tension, thermal stability and scratch resistance of polypropylene composite materials are significantly improved.
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Figure CN119410065A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of polymer materials, and in particular to a polypropylene composite material and a preparation method and application thereof. Background Art
[0002] With the development of the automobile industry, light weight, comfort, green and environmental protection have become the main directions of the development of the automobile industry. Due to its low density, light volume, wide design space, green environmental protection, excellent performance and low manufacturing cost, the use of polypropylene materials in the automobile industry has grown rapidly.
[0003] Although polypropylene has excellent performance, it still has many shortcomings when used as automotive interior parts. For example, on the one hand, polypropylene is a non-polar material, and most of the glue used for coating is an organic solvent, which makes it impossible for the glue containing organic solvents to spread on the surface of polypropylene. After coating, the adhesive is usually not strong or falls off directly. Therefore, manufacturers generally use plasma treatment to improve the polarity of the surface of polypropylene materials to obtain excellent coated parts; however, for the plasma treatment process, the process takes a long time and is costly; on the other hand, the thermal stability and scratch resistance of polypropylene materials are poor, which also limits its further application in automotive interior parts. Therefore, how to obtain polypropylene materials with high surface tension, thermal stability and scratch resistance is a technical problem that needs to be solved urgently. Summary of the invention
[0004] The purpose of the present invention is to overcome the deficiencies of the prior art. The present invention provides a polypropylene composite material and a preparation method and application thereof.
[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present disclosure is as follows: In the first aspect, the present disclosure provides a polypropylene composite material, comprising the following components in parts by weight: 64-98 parts of polypropylene, 5-30 parts of filler, 1-3 parts of modifier, 0.2-1 parts of antioxidant, and 0.2-1 parts of processing aid;
[0006] The structural formula of the modifier is as follows:
[0007]
[0008] In some embodiments, the method for preparing the modifier comprises the following steps: subjecting acetylcysteine to a thiol-ene click chemistry reaction with butadiene to obtain the modifier.
[0009] In some embodiments, the polypropylene is copolymerized polypropylene, and the molar content of the comonomer in the copolymerized polypropylene is 1-7%. Preferably, the molar content of the comonomer in the copolymerized polypropylene is 2-5%.
[0010] In some embodiments, the comonomer is at least one of ethylene, butene, and octene.
[0011] In some embodiments, the polypropylene has a melt flow rate of 10-100 g / 10 min at 230° C. and 2.16 kg.
[0012] In some embodiments, the filler is at least one of talc, calcium carbonate, glass microspheres, and glass whiskers.
[0013] In some embodiments, the antioxidant is at least one of a phenolic antioxidant, an amine antioxidant, and a phosphite antioxidant.
[0014] In some embodiments, the processing aid is a lubricant.
[0015] In a second aspect, the present disclosure provides a method for preparing the polypropylene composite material, comprising the following steps: uniformly mixing the components in proportion, and then melt-extruding and granulating the components to obtain the polypropylene composite material.
[0016] In a third aspect, the present disclosure provides use of the polypropylene composite material in preparing automotive interior trim parts.
[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention adds a modifier to polypropylene, thereby improving the surface tension, thermal stability and scratch resistance of the polypropylene composite material while ensuring the mechanical properties of the polypropylene composite material. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 is the H NMR spectrum of the modifier disclosed in the present invention. DETAILED DESCRIPTION
[0019] In order to facilitate understanding of the present disclosure, the present disclosure will be described more fully below. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present disclosure more thorough and comprehensive.
[0020] As used herein:
[0021] "Prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
[0022] The conjunction "consisting of excludes any unspecified element, step, or component. If used in a claim, this phrase renders the claim closed-ended so that it does not include materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause of the body of a claim rather than immediately following the subject matter, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.
[0023] When amount, concentration or other value or parameter is represented by range, preferred range or a series of upper preferred value and lower preferred value, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value and any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when disclosing range "1-5", described range should be interpreted as including range "1-4", "1-3", "1-2", "1-2 and 4-5", "1-3 and 5" etc. When numerical range is described in this article, unless otherwise stated, the range is intended to include its end value and all integers and fractions within the range.
[0024] In these examples, parts and percentages are by mass unless otherwise indicated.
[0025] "Parts by mass" refers to the basic unit of measurement for expressing the mass ratio of multiple components. 1 part can represent any unit mass, such as 1g or 2.689g. If we say that the mass of component A is a parts and the mass of component B is b parts, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it means that the mass of component A is aK and the mass of component B is bK (K is an arbitrary number, indicating a multiple factor). It should not be misunderstood that, unlike the mass parts, the sum of the mass of all components is not limited to 100 parts.
[0026] "And / or" is used to indicate that one or both of the stated situations may occur, for example, A and / or B includes (A and B) and (A or B).
[0027] In a first aspect, the present disclosure provides a polypropylene composite material, comprising the following components in parts by weight: 64-98 parts of polypropylene, 5-30 parts of filler, 1-3 parts of modifier, 0.2-1 parts of antioxidant, and 0.2-1 parts of processing aid;
[0028] The structural formula of the modifier is as follows:
[0029]
[0030] The present invention adds a modifier to polypropylene, and on the premise of ensuring the mechanical properties of the polypropylene composite material, improves the surface tension, thermal stability and scratch resistance of the polypropylene composite material; wherein, on the one hand, the amide group of the modifier improves the surface tension of the polypropylene composite material, and on the other hand, the adsorption effect of the polar fragment of the modifier on the surface of the polypropylene composite material exhibits excellent lubrication performance and improves the scratch resistance of the polypropylene composite material; on the other hand, the carbon-sulfur bond in the modifier can decompose the hydroperoxides generated by thermal aging of the polypropylene composite material, and produce a good synergistic effect with the antioxidant in the polypropylene composite material system, thereby improving the thermal stability of the polypropylene composite material.
[0031] For example, in different embodiments, the weight proportion of the polypropylene may be, but is not limited to, 65, 68, 70, 72, 75, 80, 83, 88, 90, 92, 95, or 97 parts.
[0032] Specifically, based on 100% by weight of the polypropylene composite material, the mass percentage of the polypropylene is not less than 55%.
[0033] For example, in different embodiments, the weight proportion of the filler may be, but is not limited to, 5 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 23 parts, 25 parts, 27 parts, or 30 parts.
[0034] For example, in different embodiments, the weight proportion of the modifier may be, but is not limited to, 1 part, 1.2 parts, 1.5 parts, 1.7 parts, 2 parts, 2.3 parts, 2.5 parts, 2.8 parts, or 3 parts.
[0035] For example, in different embodiments, the weight portion of the antioxidant may be, but is not limited to, 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, or 1 part.
[0036] For example, in different embodiments, the weight portion of the processing aid can be 0.2 part, 0.3 part, 0.5 part, 0.7 part, 0.9 part, or 1 part.
[0037] Specifically, the content of the modifier will affect the overall performance of the polypropylene composite material. If the weight of the modifier is less than 1 part, its modification effect cannot play a sufficient improvement role due to the small content, that is, the improvement degree of surface tension, thermal stability and scratch resistance is low; if the weight of the modifier is greater than 3 parts, it will cause a certain degree of decrease in the mechanical properties of the polypropylene composite material, which does not meet the requirements for the preparation of automotive covering parts.
[0038] In some embodiments, the method for preparing the modifier comprises the following steps: subjecting acetylcysteine to a thiol-ene click chemistry reaction with butadiene to obtain the modifier.
[0039] Specifically, the preparation method of the modifier is: adding acetylcysteine and butadiene to tetrahydrofuran, mixing evenly, heating and refluxing, separating the reaction product, and drying the separated solid to obtain the modifier; the reaction equation is as follows:
[0040]
[0041] The modifier prepared by the above method has high purity and few impurities.
[0042] Specifically, the molar ratio of acetylcysteine to butadiene is 1.8-2.2, for example, but not limited to 1.8, 1.9, 2.0, 2.1, 2.2.
[0043] Specifically, the heating reflux reaction time is 1-3 hours, for example, but not limited to 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours.
[0044] Specifically, the separation method is not particularly limited, as long as the liquid and solid in the product can be separated; for example, filtration, suction filtration, centrifugation and the like can be selected.
[0045] Specifically, the drying method is not particularly limited as long as the object can be dried to a constant weight, such as air drying, vacuum oven drying, microwave drying, infrared drying, and the like.
[0046] In some embodiments, the polypropylene is copolymerized polypropylene, and the molar content of the comonomer in the copolymerized polypropylene is 1-7%. Preferably, the molar content of the comonomer in the copolymerized polypropylene is 2-5%.
[0047] For example, in different embodiments, the molar content of the comonomer in the copolymerized polypropylene can be, but is not limited to, 1%, 1.2%, 1.5%, 1.7%, 2%, 2.3%, 2.5%, 2.8%, 3%, 3.2%, 3.5%, 3.7%, 4%, 4.3%, 4.5%, 4.8%, 5%, 5.3%, 5.5%, 6%, 6.5%, 6.8%, or 7%.
[0048] Specifically, the comonomer is an α-olefin other than propylene; preferably at least one of ethylene, butene and octene.
[0049] In the present disclosure, the calculation formula for the molar content of the comonomer in the copolymerized polypropylene is: molar content of the comonomer in the copolymerized polypropylene=(molar amount of the comonomer / (molar amount of the comonomer+molar amount of propylene))×100%.
[0050] When the molar content of the comonomer in the copolymerized polypropylene is in the range of 2-5%, the surface tension, thermal stability and scratch resistance of the polypropylene composite material are high. On the other hand, when the molar content of the comonomer in the copolymerized polypropylene is greater than 7%, the mechanical properties and thermal stability of the polypropylene composite material may decrease.
[0051] Specifically, the test standard for the molar content of ethylene monomer in copolymer polypropylene is SH / T 1800-2016, the test reference for the molar content of butene monomer in copolymer polypropylene is "Rapid Determination of Component Content of Polypropylene / Polybutene Kettle Alloy by Fourier Transform Infrared Spectroscopy", and the test reference for the molar content of octene monomer in copolymer polypropylene is "Synthesis and Characterization of Propylene-1-Octene Copolymer".
[0052] In some embodiments, the polypropylene has a melt flow rate of 10-100 g / 10 min at 230° C. and 2.16 kg.
[0053] For example, in different embodiments, the melt flow rate of the polypropylene at 230° C. and 2.16 kg can be, but is not limited to, 10 g / 10 min, 15 g / 10 min, 20 g / 10 min, 30 g / 10 min, 40 g / 10 min, 50 g / 10 min, 60 g / 10 min, 70 g / 10 min, 80 g / 10 min, 90 g / 10 min, and 100 g / 10 min.
[0054] Specifically, the test standard of the melt flow rate of the polypropylene is ISO 1133-2:2011.
[0055] In some embodiments, the filler is at least one of talc, calcium carbonate, glass microspheres, and glass whiskers.
[0056] In some embodiments, the antioxidant is at least one of a phenolic antioxidant, an amine antioxidant, and a phosphite antioxidant.
[0057] In some embodiments, the antioxidants are antioxidant 1010 and antioxidant 168, and the mass ratio of antioxidant 1010 to antioxidant 168 is 1-3:1.
[0058] In some embodiments, the processing aid is a lubricant.
[0059] In some embodiments, the lubricant is at least one of low molecular weight esters, metal soaps, stearic acid complex esters, and amides.
[0060] In a second aspect, the present disclosure provides a method for preparing the polypropylene composite material, comprising the following steps: uniformly mixing the components in proportion, and then melt-extruding and granulating the components to obtain the polypropylene composite material.
[0061] Specifically, in order to improve the dispersibility of the modifier in the polypropylene composite material, it is preferred to prepare the modifier and part of the polypropylene into a master batch, and then mix it with the remaining polypropylene and other components, and then melt-granulate it to obtain the polypropylene composite material.
[0062] Specifically, the preparation method of the polypropylene composite material comprises the following steps:
[0063] Preparation of modifier masterbatch: uniformly mixing the first polypropylene and the modifier, and then melt-extruding and granulating the mixture to obtain the modifier masterbatch;
[0064] Preparation of polypropylene composite material: after uniformly mixing the modifier masterbatch, the second polypropylene, the filler, the antioxidant and the processing aid, the mixture is melt-extruded and granulated to obtain the polypropylene composite material.
[0065] More specifically, the mass of the first polypropylene is 20-40% of the total mass of the first polypropylene and the second polypropylene. The first polypropylene and the second polypropylene may be the same or different; preferably, the same first polypropylene and the second polypropylene are used.
[0066] In the preparation method, the material mixing equipment can adopt various mixing equipment used in the prior art, such as a stirrer, a kneader, etc.
[0067] In the preparation method, the melt blending equipment of the materials can be selected from the general blending equipment in the rubber and plastic processing industry, which can be a twin-screw extruder, a BUSS mixing unit, etc.
[0068] In the process of preparing the masterbatch and preparing the polypropylene composite material, the speed and time of material mixing can be the speed and time commonly used in polypropylene processing, the speed is generally 300-500r / min, and the time is generally 5-10min, which can ensure uniform mixing of the materials.
[0069] In the process of preparing the masterbatch and preparing the polypropylene composite material, the material melt blending temperature can be the blending temperature commonly used in polypropylene processing, and should be selected within the range that ensures that the matrix resin is completely melted without decomposing it, generally 160°C-220°C, and the preferred processing temperature is 180-210°C; the aspect ratio of the screw extruder is 35-45.
[0070] In a third aspect, a use of the polypropylene composite material in preparing automotive interior parts is provided, wherein the automotive interior parts include door panels, instrument panels, central channels, pillars, and the like.
[0071] The raw materials used in the embodiments and comparative examples are described below, but are not limited to these materials:
[0072] PP-1: copolymer polypropylene, PP RP348R, melt mass flow rate of 25.0 g / 10 min at 230 ° C and 2.16 kg, ethylene molar content of 1.6%, CNOOC Shell;
[0073] PP-2: copolymer polypropylene, PP R140M, melt mass flow rate of 6 g / 10 min at 230 ° C and 2.16 kg, ethylene molar content of 2.1%, SK, South Korea;
[0074] PP-3: copolymer polypropylene, PP 7935E1, melt mass flow rate 60 g / 10 min at 230 °C, 2.16 kg, ethylene molar content 4%, ExxonMobil;
[0075] PP-4: copolymer polypropylene, PP BX3500, melt mass flow rate of 10 g / 10 min at 230 ° C and 2.16 kg, ethylene molar content of 5%, SK, South Korea;
[0076] PP-5: copolymer polypropylene, PPB-M60 (M60RHC), melt mass flow rate at 230°C, 2.16 kg is 57.0 g / 10 min, ethylene molar content is 7%, Sinopec;
[0077] PP-6: copolymer polypropylene, PPR-MT18-S, melt mass flow rate at 230°C, 2.16 kg is 19.8 g / 10 min, butene molar content is 5%, Maoming Petrochemical;
[0078] PP-7: copolymer polypropylene, PP 88MK40T, melt mass flow rate of 10.5 g / 10 min at 230 °C, 2.16 kg, octene molar content of 4%, SABIC;
[0079] PP-8: homopolymer polypropylene, PPH-Y26, melt mass flow rate at 230°C, 2.16kg is 26.4g / 10min, Sinochem Refining & Chemical;
[0080] The modifier is homemade, and its preparation method is as follows: acetylcysteine and butadiene in a molar ratio of 2:1 are added to tetrahydrofuran, mixed evenly, and heated under reflux for 2 hours. The reaction product is filtered, and the filtered solid is washed with anhydrous ethanol for 5 times, and then dried in a vacuum drying oven to constant weight to obtain the modifier; the nuclear magnetic hydrogen spectrum of the modifier is as follows Figure 1 shown.
[0081] Filler: talcum powder, TY80-13-C, Dongguan Sanzhi;
[0082] Antioxidants: SONOX 1010 and SONOX 168. The mass ratio of SONOX 1010 to SONOX 168 is 1:1. Both SONOX 1010 and SONOX 168 are purchased from Sanfeng Chemical.
[0083] Processing aid: fatty acid amide, TR451, Shanghai Zhuangjing.
[0084] Examples and Comparative Examples
[0085] The components of the polypropylene composite material described in the embodiment and comparative example are shown in Table 1 and Table 2; the preparation method thereof comprises the following steps:
[0086] Preparation of modifier masterbatch: adding the first polypropylene and the modifier into a high-speed mixer, mixing at a speed of 500 rpm for 8 minutes, adding the obtained mixture into a twin-screw extruder, mixing evenly and melt-extruded to granulate, so as to obtain the masterbatch; during the melt-extrusion granulation, the setting temperature of the twin-screw extruder from the feed port to the die is: the temperature of the first zone is 190° C., the temperature of the second to fourth zones is 210° C., and the temperature of the fifth to tenth zones is 200° C.; the screw speed is 350 rpm, and the aspect ratio of the twin-screw extruder is 40:1;
[0087] Preparation of polypropylene composite material: adding modifier masterbatch, second polypropylene and other components into a high-speed mixer, mixing at a rotation speed of 500 rpm for 8 minutes, adding the obtained mixture into a twin-screw extruder, mixing evenly and melt-extruded granulation to obtain the polypropylene composite material; during the melt-extrusion granulation, the setting temperatures of the twin-screw extruder from the feed port to the die are respectively: during the melt-extrusion granulation, the setting temperatures of the twin-screw extruder from the feed port to the die are respectively: the temperature of zone 1 is 190° C., the temperature of zone 2 to zone 4 is 210° C., and the temperature of zone 5 to zone 10 is 200° C.; the screw speed is 350 rpm, and the aspect ratio of the twin-screw extruder is 40:1; the first polypropylene and the second polypropylene are the same, and the mass of the first polypropylene is 30% of the total mass of the first polypropylene and the second polypropylene.
[0088] Table 1
[0089]
[0090] Table 2
[0091]
[0092]
[0093] The specific detection methods of various properties of the polypropylene composite material disclosed in the present invention are as follows:
[0094] (1) Tensile strength: The test was conducted in accordance with GB / T 1040.1-2018 and GB / T 1040.2-2022, 1A type injection molded specimen, test speed 50 mm / min;
[0095] (2) Flexural modulus: The test was conducted in accordance with GB / T 9341-2008, with a specimen size of 80 mm × 10 mm × (4.0 ± 0.2) mm, a test speed of 2 mm / min, and a support span of 64 mm;
[0096] (3) Izod notch impact strength: GB / T 1843-2008 test, specimen size 80 mm × 10 mm × (4.0 ± 0.2) mm, A-type notch, notch is made by mechanical processing;
[0097] (4) Surface tension: tested in accordance with GB / T 14216-2008;
[0098] (5) Thermal stability: Tested in accordance with GB / T7141-2008 standard, test temperature 150°C, aging time 500 hours;
[0099] (6) Scratch resistance: The test was conducted in accordance with Changan Standard VS-99.01-L-08007 “Specification for Scratch Resistance Test of Automobile Interior and Exterior Plastic Parts (Scratch Method)”, with a scratch head diameter of (1±0.01) mm and a load of (10±0.05) N.
[0100] The test results are shown in Table 3.
[0101] Table 3
[0102]
[0103]
[0104] From the experimental data in Table 3, it can be seen that the surface tension of the polypropylene composite material disclosed in the present invention is 25-32 mN / m, the tensile strength is 22.4-29.2 MPa, the flexural modulus is 1350-2450 MPa, the cantilever beam notched impact strength is 4.1-17.1 kJ / m2, the tensile strength retention rate is 82.2-93.2%, and ΔL=0.86-1.70; it indicates that the polypropylene composite material disclosed in the present invention has improved surface tension, thermal stability and scratch resistance on the basis of ensuring mechanical properties.
[0105] Comparative Examples 1-7 show that when the molar content of the comonomer in the copolymerized polypropylene is 1-7%, the surface tension of the obtained polypropylene composite material is 28-32 mN / m, the tensile strength retention rate is 89.2-93.2%, and ΔL=0.86-1.28; when the molar content of the comonomer in the copolymerized polypropylene is 2-5%, the surface tension of the obtained polypropylene composite material is 29-32 mN / m, the tensile strength retention rate is 91.5-92.8%, and ΔL=0.87-0.98; This indicates that when the molar content of the comonomer in the copolymerized polypropylene is 2-5%, the obtained polypropylene composite material has higher surface tension, thermal stability and scratch resistance.
[0106] Comparing Example 1 and Example 8, it can be seen that compared with homopolymer polypropylene, the polypropylene composite material prepared from copolymer polypropylene has higher surface tension, thermal stability and scratch resistance.
[0107] By comparing Example 1, Examples 10-14 and Comparative Examples 1-2, it can be seen that the content of the modifier affects the overall performance of the polypropylene composite material. When the content of the modifier is 1.5-2 parts by weight, the surface tension of the obtained polypropylene composite material is 27-28 mN / m, the tensile strength retention rate is 87.8-89.2%, and ΔL=1.28-1.42; indicating that the obtained polypropylene composite material has higher surface tension, thermal stability and scratch resistance.
[0108] Finally, it should be noted that the above embodiments are used to illustrate the technical solution of the present disclosure rather than to limit the protection scope of the present disclosure. Although the present disclosure has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present disclosure can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present disclosure.
Claims
1. A polypropylene composite material, characterized in that: The invention comprises the following components in parts by weight: 64-98 parts of polypropylene, 5-30 parts of filler, 1-3 parts of modifier, 0.2-1 parts of antioxidant and 0.2-1 parts of processing aid; The structural formula of the modifier is as follows:
2. The polypropylene composite material according to claim 1, characterized in that The preparation method of the modifier comprises the following steps: performing a thiol-ene click chemical reaction on acetylcysteine and butadiene to obtain the modifier.
3. The polypropylene composite material according to claim 1, characterized in that: The polypropylene is copolymer polypropylene, and the molar content of the comonomer in the copolymer polypropylene is 1-7%; preferably, the molar content of the comonomer in the copolymer polypropylene is 2-5%.
4. The polypropylene composite material according to claim 3, characterized in that: The comonomer is at least one of ethylene, butene and octene.
5. The polypropylene composite material according to claim 1, characterized in that: The melt flow rate of the polypropylene at 230° C. and 2.16 kg is 10-100 g / 10 min.
6. The polypropylene composite material according to claim 1, characterized in that: The filler is at least one of talcum powder, calcium carbonate, glass microspheres and glass whiskers.
7. The polypropylene composite material according to claim 1, characterized in that: The antioxidant is at least one of a phenolic antioxidant, an amine antioxidant, and a phosphite antioxidant.
8. The polypropylene composite material according to claim 1, characterized in that: The processing aid is a lubricant.
9. A method for preparing a polypropylene composite material according to any one of claims 1 to 8, characterized in that: The following steps are involved: After the components are uniformly mixed according to a certain proportion, melt extrusion granulation is carried out to obtain a polypropylene composite material.
10. Use of the polypropylene composite material according to any one of claims 1 to 8 in the preparation of automotive interior trims.