Polypropylene composite material, and preparation method and application thereof

Abstract

The application relates to the technical field of high polymer materials, and discloses a polypropylene composite material as well as a preparation method and application thereof.The polypropylene composite material comprises the following preparation raw materials: polypropylene resin, inorganic filler, toughening agent, glass slag, color master batch and auxiliary agent.The polypropylene composite material provided by the application has a 60-degree glossiness of more than 90%, high glossiness, a linear expansion coefficient in a temperature range of-30-100 DEG C of less than 50*10 ‑6 -6 / K, small change in material size with temperature, good size stability, excellent mechanical properties of the material, simple material preparation method, mild process conditions, suitability for industrial application, high glossiness of the material itself, no need to spray when the material is used for preparing automobile interior and exterior trim parts, cost reduction and environmental friendliness, good size stability of the material, good mechanical properties, replacement of metal for preparing vehicle fender and tail door parts, and compliance with the development trend of automobile light weight, comfort and safety.

Description

Technical Field

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

[0002] In automobile manufacturing, exterior decorative parts such as bumpers and wheel arches are typically painted onto plastic substrates. Surface coatings not only protect the resin substrate but also achieve high-gloss, matte, and other surface effects, as well as weather resistance and scratch resistance. However, the painting process is complex. After injection molding the blanks, basic steps such as transportation, pretreatment, painting, and further transportation are required. Some painting processes also involve multiple production steps, including primer, topcoat, and UV-cured paint. Furthermore, for parts with defects during production, the thermosetting paint already applied is difficult to peel off, leading to recycling difficulties, resource waste, and environmental pollution. If the raw materials used to manufacture automotive parts inherently possess high-gloss properties, the parts can have their own inherent gloss, eliminating the need for painting. This balances part quality and manufacturing costs while being more environmentally friendly.

[0003] Polypropylene composites, characterized by low density and low cost, are widely used in the manufacture of automotive parts. However, exterior automotive components such as fenders and tailgates require dimensional matching with multiple surrounding parts, placing stringent demands on dimensional stability. Therefore, these parts are currently primarily made of metal, resulting in heavy products and limited design freedom. While replacing metal with polypropylene composites in the manufacture of these parts could significantly reduce weight and achieve lightweighting, aligning with the trends of lightweight, comfortable, and safe automotive manufacturing, ordinary polypropylene materials suffer from high shrinkage and poor dimensional stability, failing to meet the high dimensional stability requirements of the manufactured parts. Summary of the Invention

[0004] The present invention aims to at least solve one of the aforementioned technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a polypropylene composite material; a second objective is to provide a method for preparing such a polypropylene composite material; and a third objective is to provide applications of such a polypropylene composite material.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A first aspect of the present invention provides a polypropylene composite material comprising the following raw materials: polypropylene resin, inorganic filler, toughening agent, glass slag, color masterbatch, and additives.

[0007] Preferably, the polypropylene composite material comprises the following raw materials in weight percentage: 50-70% polypropylene resin, 5-25% inorganic filler, 1-20% toughening agent, 1-10% glass slag, 0.1-1% color masterbatch, and 0.2-2% additives; more preferably, the polypropylene composite material comprises the following raw materials in weight percentage: 60-70% polypropylene resin, 10-20% inorganic filler, 5-15% toughening agent, 2-8% glass slag, 0.5-1% color masterbatch, and 0.2-1% additives.

[0008] Preferably, the gloss of the polypropylene resin at 60° is ≥80%; more preferably, the gloss of the polypropylene resin at 60° is 85-95%.

[0009] Preferably, the melt index of the polypropylene resin at a test condition of 230℃ / 2.16kg is 1g / 10min-100g / 10min; more preferably, the melt index of the polypropylene resin at a test condition of 230℃ / 2.16kg is 20g / 10min-30g / 10min.

[0010] Preferably, the polypropylene resin includes at least one of homopolymer polypropylene and block copolymer polypropylene; more preferably, the polypropylene resin is PP EP548G from Sinopec (Tianjin) Petrochemical Co., Ltd., which is polymerized using the Spherizone process. By adjusting the ethylene content, controlling the rubber phase content and size, it achieves a gloss level 25% higher than that of ordinary copolymer PP raw materials.

[0011] Preferably, the inorganic filler has a particle size of 0.5-10 μm; more preferably, the inorganic filler has a particle size of 1-3 μm.

[0012] Preferably, the inorganic filler includes at least one of barium sulfate and wollastonite; more preferably, the inorganic filler is barium sulfate.

[0013] Preferably, the toughening agent has a melt flow index of 10g / 10min-30g / 10min under test conditions of 190℃ / 2.16kg; more preferably, the toughening agent has a melt flow index of 13g / 10min-30g / 10min under test conditions of 190℃ / 2.16kg.

[0014] Preferably, the toughening agent includes at least one of ethylene propylene rubber, ethylene-octene copolymer, ethylene-butene copolymer, and ethylene-vinyl acetate copolymer; more preferably, the toughening agent is ethylene-octene copolymer (POE).

[0015] Specifically, when using POE as a toughening agent, the elastomer itself has a negative impact on the gloss of polypropylene composites. However, elastomers with relatively high melt flow index (190℃ / 2.16kg, 10g / 10min-30g / 10min) are more easily stretched into strips in polypropylene resin matrix. This reduces the adverse effect on the gloss of the material while adding toughening agent to enhance the mechanical properties of the material.

[0016] Preferably, the glass slag has a sheet-like structure; the aspect ratio of the glass slag is 1:(10-50); more preferably, the aspect ratio of the glass slag is 1:(15-25).

[0017] Specifically, by introducing special glass slag fillers into the formulation system, the glass slag with a certain size and a sheet-like structure has a good light-radiating effect, which can provide better gloss to polypropylene composites; and the sheet-like structure of the glass slag can hinder the crystallization of polypropylene matrix resin, thereby reducing the linear expansion coefficient of polypropylene composites and improving the dimensional stability of the material.

[0018] Preferably, the carbon black content of the masterbatch is 20-60 wt%; more preferably, the carbon black content of the masterbatch is 30-50 wt%.

[0019] Preferably, the color masterbatch is a PP resin carrier.

[0020] Preferably, the additives include antioxidants and lubricants.

[0021] Preferably, the mass ratio of the antioxidant to the lubricant is (1-1.5):1; more preferably, the mass ratio of the antioxidant to the lubricant is (1.2-1.5):1.

[0022] Preferably, the antioxidant includes at least one of hindered phenolic antioxidants, thioester antioxidants, and phosphite antioxidants; more preferably, the antioxidant is a compound antioxidant of hindered phenolic antioxidants and phosphite antioxidants.

[0023] Preferably, the mass ratio of the hindered phenolic antioxidant to the phosphite antioxidant is 1:(1-2); more preferably, the mass ratio of the hindered phenolic antioxidant to the phosphite antioxidant is 1:(1.5-2).

[0024] Preferably, the hindered phenolic antioxidant includes at least one of 2,6-di-tert-butyl-p-methylphenol (BHT), β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester (antioxidant 1076), pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010), N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine (antioxidant 1098), and triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate] (antioxidant 245); more preferably, the hindered phenolic antioxidant is antioxidant 1010.

[0025] Preferably, the phosphite antioxidant includes at least one of diphenyl isooctyl phosphite (ODPP), tris[2,4-di-tert-butylphenyl] phosphite (antioxidant 168), bisphenol A phosphite, and triphenyl phosphite (TPP); more preferably, the phosphite antioxidant is antioxidant 168.

[0026] Preferably, the lubricant includes at least one of stearate and silicone masterbatch; more preferably, the lubricant is stearate.

[0027] A second aspect of the present invention provides a method for preparing the polypropylene composite material described in the first aspect of the present invention, comprising the following steps:

[0028] S1. First, mix polypropylene resin, inorganic filler and toughening agent, then add color masterbatch and additives and mix well to obtain premix;

[0029] S2. Glass shavings are added to the premix, and the mixture is melt-mixed and extruded using a twin-screw extruder to obtain the polypropylene composite material.

[0030] Preferably, in step S1, the premix is ​​mixed at a speed of 800-1500 r / min for 5-10 min.

[0031] Preferably, in step S2, the temperatures of each section of the feeding section of the twin-screw extruder are set to 160-165℃, 160-165℃, 160-165℃, 160-170℃, 170-180℃, 180-190℃, 190-200℃, and 200-210℃, the die head temperature is 200-210℃, and the screw speed is 300-600 r / min.

[0032] Preferably, in step S2, the screw assembly of the twin-screw extruder includes a toothed disc thread element.

[0033] A third aspect of the present invention provides the application of the polypropylene composite material described in the first aspect of the present invention in the preparation of automotive interior and exterior parts.

[0034] Preferably, the automotive interior and exterior trim components include fenders and tailgates.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] (1) The polypropylene composite material provided by this invention can achieve a gloss level of over 90% at 60°, exhibiting high gloss; the linear expansion coefficient within the temperature range of -30 to 100°C can be lower than 50 × 10⁻⁶. -6 / K, the material size changes little with temperature, and has good dimensional stability; the material has excellent mechanical properties.

[0037] (2) The polypropylene composite material preparation method provided by the present invention is simple, the process conditions are mild, and it is suitable for industrial application.

[0038] (3) The polypropylene composite material provided by the present invention has high gloss and can eliminate the painting process when used to prepare automotive interior and exterior parts, thereby reducing costs and being environmentally friendly. The material has good dimensional stability and good mechanical properties, and can replace metals in the preparation of vehicle fenders and tailgates, which is in line with the development trend of lightweight, comfortable and safe automobiles. Detailed Implementation

[0039] The present invention will be further described in detail below through specific embodiments. Unless otherwise specified, the raw materials, reagents, or apparatus used in the embodiments and comparative examples are all available from conventional commercial sources or can be obtained by existing technical methods. Unless otherwise specified, the test or experimental methods are conventional methods in the art.

[0040] The raw material information used in the following examples and comparative examples is shown in Table 1 below:

[0041] Table 1. Information on raw materials used in the examples and comparative examples.

[0042]

[0043] Among them, the melt index of polypropylene resin PP EP548G at 230℃ / 2.16kg was 26g / 10min, and PP EP548G is a high-gloss resin with a gloss of ≥80% at 60°; the melt index of PP EP548R at 230℃ / 2.16kg was 26g / 10min, and it is a normal-gloss resin; the melt index of toughening agent POE8613 at 190℃ / 2.16kg was 13g / 10min; the melt index of POE565 at 190℃ / 2.16kg was 5g / 10min; the carbon black content of masterbatch Cabot XP6622A was 40wt%; and the particle size of barium sulfate LC-330 was 1.5μm.

[0044] Example 1

[0045] This embodiment prepares a polypropylene composite material, and the raw materials are shown in Table 2:

[0046] Table 2. Raw material composition of polypropylene composite material in Example 1

[0047]

[0048] The preparation method of polypropylene composite material includes the following steps:

[0049] S1. Mix polypropylene resin, inorganic filler and toughening agent, add antioxidant, lubricant and color masterbatch and continue to mix evenly to obtain premix;

[0050] S2. Mix the premix at 1200 r / min for 10 min;

[0051] S3. The premixed material is added from the main feed port of the twin-screw extruder, and glass shavings are added from the side feed port. The polypropylene composite material is obtained by melt extrusion granulation.

[0052] The temperature settings for each section of the feeding section of the twin-screw extruder are 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, and 200℃, the die head temperature is 210℃, and the screw speed is 500r / min.

[0053] Example 2

[0054] This embodiment prepares a polypropylene composite material, and the raw materials are shown in Table 3:

[0055] Table 3. Raw material composition of polypropylene composite material in Example 2

[0056]

[0057]

[0058] The preparation method of polypropylene composite material includes the following steps:

[0059] S1. Mix polypropylene resin, inorganic filler and toughening agent, add antioxidant, lubricant and color masterbatch and continue to mix evenly to obtain premix;

[0060] S2. Mix the premix at 1200 r / min for 10 min;

[0061] S3. The premixed material is added from the main feed port of the twin-screw extruder, and glass shavings are added from the side feed port. The polypropylene composite material is obtained by melt extrusion granulation.

[0062] The temperature settings for each section of the feeding section of the twin-screw extruder are 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, and 200℃, the die head temperature is 210℃, and the screw speed is 500r / min.

[0063] Example 3

[0064] This embodiment prepares a polypropylene composite material, and the raw materials are shown in Table 4:

[0065] Table 4. Raw material composition of polypropylene composite material in Example 3

[0066]

[0067] The preparation method of polypropylene composite material includes the following steps:

[0068] S1. Mix polypropylene resin, inorganic filler and toughening agent, add antioxidant, lubricant and color masterbatch and continue to mix evenly to obtain premix;

[0069] S2. Mix the premix at 1200 r / min for 10 min;

[0070] S3. The premixed material is added from the main feed port of the twin-screw extruder, and glass shavings are added from the side feed port. The polypropylene composite material is obtained by melt extrusion granulation.

[0071] The temperature settings for each section of the feeding section of the twin-screw extruder are 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, and 200℃, the die head temperature is 210℃, and the screw speed is 500r / min.

[0072] Example 4

[0073] This embodiment prepares a polypropylene composite material, and the raw materials are shown in Table 5:

[0074] Table 5. Raw material composition of polypropylene composite material in Example 4

[0075]

[0076] The preparation method of polypropylene composite material includes the following steps:

[0077] S1. Mix polypropylene resin, inorganic filler and toughening agent, add antioxidant, lubricant and color masterbatch and continue to mix evenly to obtain premix;

[0078] S2. Mix the premix at 1200 r / min for 10 min;

[0079] S3. The premixed material is added from the main feed port of the twin-screw extruder, and glass shavings are added from the side feed port. The polypropylene composite material is obtained by melt extrusion granulation.

[0080] The twin-screw extruder features a screw assembly with added toothed disc thread components. The feeding section temperatures are set at 160℃, 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, and 200℃, the die head temperature is 210℃, and the screw speed is 500 r / min.

[0081] Example 5

[0082] This embodiment prepares a polypropylene composite material, and the raw materials are shown in Table 6:

[0083] Table 6. Raw material composition of polypropylene composite material in Example 5.

[0084]

[0085] The preparation method of polypropylene composite material includes the following steps:

[0086] S1. Mix polypropylene resin, inorganic filler and toughening agent, add antioxidant, lubricant and color masterbatch and continue to mix evenly to obtain premix;

[0087] S2. Mix the premix at 1200 r / min for 10 min;

[0088] S3. The premixed material is added from the main feed port of the twin-screw extruder, and glass shavings are added from the side feed port. The polypropylene composite material is obtained by melt extrusion granulation.

[0089] The twin-screw extruder features a screw assembly with added toothed disc thread components. The feeding section temperatures are set at 160℃, 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, and 200℃, the die head temperature is 210℃, and the screw speed is 500 r / min.

[0090] Comparative Example 1

[0091] This comparative example prepares a polypropylene composite material, using the raw materials shown in Table 7:

[0092] Table 7. Raw material composition of Comparative Example 1: Polypropylene composite material

[0093]

[0094]

[0095] The preparation method of polypropylene composite material includes the following steps:

[0096] S1. Mix polypropylene resin, inorganic filler and toughening agent, add antioxidant, lubricant and color masterbatch and continue to mix evenly to obtain premix;

[0097] S2. Mix the premix at 1200 r / min for 10 min;

[0098] S3. The premixed material is added from the main feed port of the twin-screw extruder and melt-extruded to obtain a polypropylene composite material.

[0099] The temperature settings for each section of the feeding section of the twin-screw extruder are 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, and 200℃, the die head temperature is 210℃, and the screw speed is 500r / min.

[0100] Comparative Example 2

[0101] This comparative example prepares a polypropylene composite material, using the raw materials shown in Table 8:

[0102] Table 8. Raw material composition of polypropylene composite material in Comparative Example 2

[0103]

[0104] The preparation method of polypropylene composite material includes the following steps:

[0105] S1. Mix polypropylene resin, inorganic filler and toughening agent, add antioxidant, lubricant and color masterbatch and continue to mix evenly to obtain premix;

[0106] S2. Mix the premix at 1200 r / min for 10 min;

[0107] S3. The premixed material is added from the main feed port of the twin-screw extruder and melt-extruded to obtain a polypropylene composite material.

[0108] The temperature settings for each section of the feeding section of the twin-screw extruder are 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, and 200℃, the die head temperature is 210℃, and the screw speed is 500r / min.

[0109] Comparative Example 3

[0110] This comparative example prepares a polypropylene composite material, and the raw materials are shown in Table 9:

[0111] Table 9. Raw material composition of comparative example 3 polypropylene composite material

[0112]

[0113] The preparation method of polypropylene composite material includes the following steps:

[0114] S1. Mix polypropylene resin, inorganic filler and toughening agent, add antioxidant, lubricant and color masterbatch and continue to mix evenly to obtain premix;

[0115] S2. Mix the premix at 1200 r / min for 10 min;

[0116] S3. The premixed material is added from the main feed port of the twin-screw extruder and melt-extruded to obtain a polypropylene composite material.

[0117] The temperature settings for each section of the feeding section of the twin-screw extruder are 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, and 200℃, the die head temperature is 210℃, and the screw speed is 500r / min.

[0118] Comparative Example 4

[0119] This comparative example prepares a polypropylene composite material, using the raw materials shown in Table 10:

[0120] Table 10 Comparative Example 4 Polypropylene Composite Material Composition

[0121]

[0122]

[0123] The preparation method of polypropylene composite material includes the following steps:

[0124] S1. Mix polypropylene resin, inorganic filler and toughening agent, add antioxidant, lubricant and color masterbatch and continue to mix evenly to obtain premix;

[0125] S2. Mix the premix at 1200 r / min for 10 min;

[0126] S3. The premixed material is added from the main feed port of the twin-screw extruder and melt-extruded to obtain a polypropylene composite material.

[0127] The twin-screw extruder features a screw assembly with added toothed disc thread components. The feeding section temperatures are set at 160℃, 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, and 200℃, the die head temperature is 210℃, and the screw speed is 500 r / min.

[0128] Comparative Example 5

[0129] This comparative example prepares a polypropylene composite material, and the raw materials are shown in Table 11:

[0130] Table 11. Raw material composition of polypropylene composite material in Comparative Example 5

[0131]

[0132] The preparation method of polypropylene composite material includes the following steps:

[0133] S1. Mix polypropylene resin, inorganic filler and toughening agent, add antioxidant, lubricant and color masterbatch and continue to mix evenly to obtain premix;

[0134] S2. Mix the premix at 1200 r / min for 10 min;

[0135] S3. The premixed material is added from the main feed port of the twin-screw extruder and melt-extruded to obtain a polypropylene composite material.

[0136] The temperature settings for each section of the feeding section of the twin-screw extruder are 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, and 200℃, the die head temperature is 210℃, and the screw speed is 500r / min.

[0137] Performance testing

[0138] The gloss (60°), linear expansion coefficient, tensile strength, elongation at break, impact strength, and shrinkage of the polypropylene composites in Examples 1-5 and Comparative Examples 1-5 were tested. The test methods and standards are shown in Table 12, and the test results are shown in Table 13.

[0139] Table 12 Reference Standards for Performance Testing of Polypropylene Composites

[0140] Gloss (60°) Standard for Gloss of Plastics GB / T8807-1998 linear expansion coefficient ISO 11359-1, temperature range is -30 to 100℃ Tensile strength ISO 527-1-2012 Elongation at break ISO 527-1-2012 Impact strength ISO 180-2000 Shrinkage ISO 294-4-2001

[0141] Table 13 Test results of polypropylene composite materials in Examples 1-5 and Comparative Examples 1-5

[0142]

[0143]

[0144] Table 13 shows the test results of the polypropylene composite materials in Examples 1-5 and Comparative Examples 1-5. As can be seen from Table 13, the polypropylene composite materials prepared in Examples 1-5 using high-gloss polypropylene resin as the resin matrix, barium sulfate as the inorganic filler, POE elastomer with a melt index of 13 g / 10 min at 190℃ / 2.16 kg as the toughening agent, and with the addition of glass shavings, exhibit a high gloss (60°), reaching over 90%. Furthermore, the linear expansion coefficient of the material within the temperature range of -30 to 100℃ can be as low as 50 × 10⁻⁶. -6 Below / K indicates that the material's dimensions change little with temperature, demonstrating high dimensional stability; the material's tensile strength can reach 22MPa, its elongation at break is high, reaching 270%, and its impact strength can reach 37KJ / m. 2 The shrinkage rate can reach below 0.9%, indicating that the material has excellent mechanical properties, is not easy to break, has excellent resistance to deformation and impact, and has high quality and reliability.

[0145] Compared to Examples 3 and 4, the raw material composition of the materials is the same. However, in Example 4, the twin-screw extruder used to prepare the polypropylene composite material incorporated a toothed disc thread element. This resulted in improved gloss and mechanical properties of the material in Example 4. This indicates that compared to ordinary shear-dispersing thread elements, toothed disc thread elements can better disperse toughening agents and inorganic fillers, thereby optimizing the material's mechanical properties. Furthermore, the toothed disc thread element causes less damage to the lamellar structure of the glass slag, allowing the glass slag to better maintain its lamellar structure, thus providing better light emission and improving the material's gloss.

[0146] Compared with Example 4, Example 5 uses glass slag with a larger aspect ratio, which further improves the gloss of the material, indicating that glass slag with a larger aspect ratio has a stronger light emission ability and is more conducive to improving the gloss of the material.

[0147] In Comparative Example 1, a polypropylene composite material was prepared using ordinary gloss polypropylene resin as the resin matrix, talc powder as the inorganic filler, and POE elastomer with a melt index of 5 g / 10 min at 190℃ / 2.16 kg as the toughening agent, without the addition of glass slag. It can be seen that the polypropylene composite material in Comparative Example 1 has a low gloss level of only 54% at 60°, and a high linear expansion coefficient of 81 × 10⁻⁶. -6 / K, poor dimensional stability; low tensile strength, elongation at break, and impact strength, but high shrinkage rate, resulting in poor overall mechanical properties of the material.

[0148] Compared with Comparative Example 1, Comparative Example 2 replaced the resin matrix with high-gloss polypropylene resin. It can be seen that the mechanical properties of the material did not change much, but the gloss was improved. This shows that using high-gloss polypropylene resin as raw material has a positive effect on improving the gloss of polypropylene composite materials.

[0149] Compared to Comparative Example 2, Comparative Example 3, by replacing the low melt flow index elastomer POE565 with the high melt flow index elastomer POE8613, shows improved mechanical properties and dimensional stability of the material, while maintaining the gloss level. While elastomers themselves negatively impact the gloss of polypropylene composites, this invention uses a high melt flow index elastomer with a melt flow index of 10 g / 10 min to 30 g / 10 min at 190℃ / 2.16 kg. High melt flow index elastomers are relatively easier to stretch into strips within the polypropylene resin matrix, thus improving the material's mechanical properties while having a smaller impact on the gloss level of the polypropylene composite.

[0150] Compared to Comparative Example 3, Comparative Example 4 used the same raw material composition, but the twin-screw extruder used in preparing the polypropylene composite material in Comparative Example 4 incorporated a toothed disc thread element in its screw assembly. This resulted in improved gloss and mechanical properties of the material. This indicates that, compared to ordinary shear-dispersing thread elements, the toothed disc thread element allows for better dispersion of toughening agents and inorganic fillers, thereby optimizing the material's mechanical properties.

[0151] Compared with Comparative Example 3, replacing the inorganic filler talc with barium sulfate in Comparative Example 5 resulted in an improvement in the gloss of the material.

[0152] The polypropylene composite material provided by this invention uses polypropylene resin with high gloss as the base material, laying the foundation for the high gloss of the material. Then, a sheet-like glass shard is added, utilizing its light-radiating effect to optimize the gloss of the composite material. Simultaneously, the glass shard also inhibits the crystallization of the matrix resin, thereby improving the dimensional stability of the material. A toughening agent with a high melt flow index is used, making it easier to stretch into strips within the base material, thus improving the mechanical properties of the material while reducing the impact of the toughening agent on the material's gloss. By adding antioxidants, lubricants, and other additives, the material's weather resistance and processing performance are improved, ultimately resulting in a polypropylene composite material with high gloss, good dimensional stability, and excellent mechanical properties. The preparation method of the material is simple and can meet the application requirements for manufacturing automotive interior and exterior parts.

Claims

1. A polypropylene composite material, characterized in that, The raw materials for preparation are as follows: 60%-70% polypropylene resin, 10%-20% inorganic filler, 5%-15% toughening agent, 2%-8% glass slag, 0.5%-1% color masterbatch, and 0.2%-1% additives; The polypropylene resin has a gloss of ≥80% at 60°C; the toughening agent has a melt index of 10g / 10min-30g / 10min at a test condition of 190°C / 2.16kg; the glass slag has a flake structure; the aspect ratio of the glass slag is 1:(10-50); the inorganic filler is barium sulfate with a particle size of 0.5-10μm; and the additives are antioxidants and lubricants in a mass ratio of (1-1.5):

1.

2. The polypropylene composite material according to claim 1, characterized in that, The melt flow index of the polypropylene resin under test conditions of 230℃ / 2.16kg is 1g / 10min-100g / 10min.

3. The polypropylene composite material according to claim 1, characterized in that, The toughening agent includes at least one of ethylene propylene rubber, ethylene-octene copolymer, ethylene-butene copolymer, and ethylene-vinyl acetate copolymer.

4. The polypropylene composite material according to claim 1, characterized in that, The masterbatch contains 20-60 wt% carbon black.

5. The method for preparing the polypropylene composite material according to any one of claims 1-4, characterized in that, Includes the following steps: S1. First, mix polypropylene resin, inorganic filler and toughening agent, then add color masterbatch and additives and mix well to obtain premix; S2. Glass shavings are added to the premix, and the mixture is melt-mixed and extruded using a twin-screw extruder to obtain the polypropylene composite material.

6. The use of the polypropylene composite material according to any one of claims 1-4 in the preparation of automotive interior and exterior parts.

Images