Polypropylene composite material as well as preparation method and application thereof

Abstract

The invention provides a polypropylene composite material as well as a preparation method and application thereof. The polypropylene composite material comprises the following components in parts by weight: 58-78 parts of straight-chain polypropylene resin, 8-21 parts of long-chain branched polypropylene resin, 8-30 parts of a filling agent and 4-22 parts of a toughening agent, wherein the filling agent comprises a combination of talcum powder and mica. The components of the polypropylene composite material are designed, the polypropylene composite material with excellent mechanical properties and high thermal deformation temperature is prepared through the matching effect of the components, the preparation process of the polypropylene composite material is simple, large-scale mass production can be carried out, and the polypropylene composite material is suitable for large-scale production. The method can be widely applied to the fields of preparation of automobile ventilation cover plates, engine covers, air conditioner shells and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite materials, and specifically relates to a polypropylene composite material and a preparation method and application thereof, and more specifically relates to a polypropylene composite material with a high heat deformation temperature and a preparation method and application thereof. Background Art

[0002] Polypropylene material has the advantages of wide source, low cost, low density, and easy molding. It has been widely used in many fields such as home appliances, automobiles, power tools, packaging, building materials and furniture. However, the heat deformation temperature of polypropylene material is relatively low, which limits its application in high temperature environments. With the development of new energy vehicles, the demand for weight reduction and cost reduction is increasing, and many parts have a trend of plasticization, such as engine hoods, heat insulation panels, air conditioning housings, etc. Therefore, improving the heat deformation temperature of polypropylene has become an important research direction.

[0003] Conventional methods for increasing the heat deformation temperature of polypropylene mainly include adding fillers or nucleating agents. For example, CN102040778A discloses a high-filled high heat deformation temperature polypropylene composite material. The composite material is composed of the following raw materials in weight percentage: copolymerized polypropylene 30-70%; powdered polypropylene 5-10%; talcum powder 10-50%; composite antioxidant 0.5-1.5%; nucleating agent 0.1-0.5%; processing aid 0.1-1%; elastomer 0-20%. The composite antioxidant is a mixture of an antioxidant with multipolar functional groups and a common antioxidant, and the functionality of the polar functional group antioxidant is ≥3. This technical solution uses a master batching process and a multipolar functional group antioxidant to prepare a high powder content filled polypropylene composite material with a high heat deformation temperature through mixing. Although the heat deformation temperature of the polypropylene composite material obtained by this method is improved, a large amount of filling powder, antioxidant and nucleating agent are used, which sacrifices the material density characteristics and cannot meet the material specification requirements under the specified specifications.

[0004] CN103571056A discloses a high heat deformation temperature polypropylene nanocomposite composition and a preparation method thereof, wherein the polypropylene nanocomposite composition is composed of the following raw materials in weight percentage: 100 parts of polypropylene, 0.1 to 5 parts of octa(N-cyclohexyl)benzamide polysilsesquioxane, 0.001 to 1 part of a nucleating agent, and 0.1 to 3 parts of an antioxidant. The technical scheme improves the heat deformation temperature of polypropylene by compounding octa(N-cyclohexyl)benzamide polysilsesquioxane with a β-type nucleating agent TMB-5, but it simply increases the compounding content of octa(N-cyclohexyl)benzamide polysilsesquioxane and the β-type nucleating agent TMB-5, and does not take into account the expensive characteristics of the β-type nucleating agent, making it difficult to mass commercialize.

[0005] In summary, how to provide a polypropylene composite material with a high heat deformation temperature without affecting material specifications or mass production has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] In view of the deficiencies of the prior art, the purpose of the present invention is to provide a polypropylene composite material, a preparation method and application thereof, and more specifically to a polypropylene composite material with a high heat deformation temperature, a preparation method and application thereof. The present invention designs the components of the polypropylene composite material, further designs the long-chain branched polypropylene resin, and prepares a polypropylene composite material with excellent mechanical properties and a high heat deformation temperature through the coordination of the components. The polypropylene composite material has a simple preparation process, can be mass-produced, and can be widely used in the preparation of automotive ventilation covers, engine hoods, air conditioning housings and other fields.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a polypropylene composite material, wherein the polypropylene composite material comprises the following components in parts by weight:

[0009] 58-78 parts of linear polypropylene resin;

[0010] 8-21 parts of long-chain branched polypropylene resin;

[0011] 8-30 parts of filler;

[0012] 4-22 parts of toughening agent;

[0013] The filler includes a combination of talc and mica.

[0014] The present invention designs the components of the polypropylene composite material, further designs the amount of the long-chain branched polypropylene resin, and prepares the polypropylene composite material with excellent mechanical properties and high heat deformation temperature through the coordination of the components. The preparation process of the polypropylene composite material is simple, and large-scale mass production can be carried out, and the polypropylene composite material can be widely used in the fields of preparing automobile ventilation covers, engine hoods, air-conditioning housings, etc.

[0015] The invention introduces long-chain branched polypropylene resin and utilizes the entanglement effect of the long-chain branches and the shear-induced crystallization thereof, thereby significantly improving the heat deformation temperature of the polypropylene composite material. The introduction of the long-chain branched polypropylene can avoid increasing the heat deformation temperature of the polypropylene composite material by increasing the filler amount or the amount of expensive nucleating agent, thereby effectively reducing the material use cost and having high mass productivity.

[0016] In the present invention, the use of fillers can further improve the heat deformation temperature and bending modulus of the polypropylene composite material. If the amount of filler is too much, the entanglement effect of the long-chain branched polypropylene in the polypropylene composite material will be reduced, because the filler can act as a nucleating agent to a certain extent, and when the filler content is large, the entanglement effect of the system is weakened, which ultimately leads to a deterioration in the heat deformation temperature of the polypropylene composite material.

[0017] Meanwhile, in the present invention, the composition of the filler is designed and the synergistic effect of talcum powder and mica is used to further increase the heat deformation temperature of the polypropylene composite material.

[0018] In the present invention, taking the mass percentage of the polypropylene composite material as 100%, the mass percentage of the long-chain branched polypropylene resin in the polypropylene composite material is 7-21%, for example, it can be 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20% or 21%, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable, and the weight percentage of the long-chain branched polypropylene resin can also be any combination of the aforementioned values, preferably 8.5-18%.

[0019] In the present invention, the weight percentage of the linear polypropylene resin in the polypropylene composite material is 58-78 parts, for example, it can be 58 parts, 60 parts, 63 parts, 66 parts, 68 parts, 72 parts, 75 parts, 77 parts or 78 parts, but is not limited to the listed values. Other unlisted values ​​within the numerical range are also applicable, and the weight percentage of the linear polypropylene resin can also be any combination of the aforementioned values.

[0020] In the present invention, taking the mass percentage of the polypropylene composite material as 100%, the mass percentage of the linear polypropylene resin in the polypropylene composite material is ≥50%, for example, it can be 50%, 52%, 55%, 57%, 60%, 63%, 66%, 68%, 70%, 73% or 75%, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable, and the weight percentage of the linear polypropylene resin can also be any combination of the aforementioned values, preferably 52 to 73%.

[0021] The weight proportion of the long-chain branched polypropylene resin in the polypropylene composite material is 8-21 parts, for example, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts or 21 parts, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable, and the weight proportion of the long-chain branched polypropylene resin can also be any combination of the aforementioned values.

[0022] The weight proportion of the filler in the polypropylene composite material is 8-30 parts, for example, 8 parts, 12 parts, 15 parts, 18 parts, 21 parts, 24 parts, 27 parts or 30 parts, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable, and the weight proportion of the filler can also be any combination of the aforementioned values.

[0023] The weight percentage of the toughening agent in the polypropylene composite material is 4-22 parts, for example, it can be 4 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts or 22 parts, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable, and the weight percentage of the toughening agent can also be any combination of the aforementioned values. The following is a preferred technical solution of the present invention, but it is not intended to limit the technical solution provided by the present invention. Through the following preferred technical solution, the purpose and beneficial effects of the present invention can be better achieved and realized.

[0024] As a preferred technical solution of the present invention, the linear polypropylene resin includes copolymerized polypropylene resin.

[0025] As a preferred technical solution of the present invention, the melt flow rate of the linear polypropylene resin at 230°C and 2.16kg is 10-60g / 10min, for example, it can be 10g / 10min, 15g / 10min, 20g / 10min, 25g / 10min, 30g / 10min, 35g / 10min, 40g / 10min, 45g / 10min, 50g / 10min, 55g / 10min or 60g / 10min, but is not limited to the listed values. Other unlisted values ​​within the numerical range are also applicable, and the melt flow rate of the linear polypropylene resin can also be the range of any combination of the aforementioned values.

[0026] In the present invention, the melt flow rate of the linear polypropylene resin is tested at 230° C. and 2.16 kg according to ISO 1133-1:2022 standard.

[0027] As a preferred technical solution of the present invention, the long-chain branched polypropylene resin includes long-chain branched homopolymer polypropylene resin.

[0028] As a preferred technical solution of the present invention, the α value of the long-chain branched polypropylene resin is 0.4-1.4, for example, it can be 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.1, 1.2, 1.3 or 1.4, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable, and the α value of the long-chain branched polypropylene resin can also be the range of any combination of the aforementioned values.

[0029] Preferably, the α value of the long-chain branched polypropylene resin is 0.5-0.95, for example, it can be 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9 or 0.95, but is not limited to the listed values. Other unlisted values ​​within the numerical range are also applicable, and the α value of the long-chain branched polypropylene resin can also be any combination of the aforementioned values.

[0030] In the present invention, by designing the α value (branching degree) of the long-chain branched polypropylene resin, the entanglement effect of the long-chain branched polypropylene resin and the shear-induced crystallization thereof are utilized to significantly increase the heat deformation temperature of the polypropylene composite material. If the α value of the long-chain branched polypropylene resin is too low, the heat deformation temperature of the polypropylene composite material is not significantly increased; if the α value of the long-chain branched polypropylene resin is too high, the rigidity of the main chain is maintained to a certain extent, and the heat deformation temperature of the polypropylene composite material is not significantly increased.

[0031] In the present invention, the α value of the long-chain branched polypropylene resin is the α value of the Mark-Houwink formula, which is used to characterize the branching degree of the long-chain branched polypropylene resin, that is, the branching content of the long-chain branched polypropylene resin. The α value is obtained by gel permeation chromatography (GPC) test fitting, and the Mark-Houwink formula is as follows:

[0032] η=KM w α

[0033] Wherein: η is the characteristic viscosity of the polymer, Mw is the weight average molecular weight of the polymer, and K is the Mark-Houwink parameter. As a preferred technical solution of the present invention, the melt flow rate of the long-chain branched polypropylene resin at 230°C and 2.16kg is 1.0-2.5g / 10min, for example, it can be 1.0g / 10min, 1.1g / 10min, 1.2g / 10min, 1.5g / 10min, 1.8g / 10min, 2.0g / 10min, 2.2g / 10min, 2.4g / 10min or 2.5g / 10min, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable, and the melt flow rate of the long-chain branched polypropylene resin can also be any combination of the aforementioned values.

[0034] In the present invention, the melt flow rate of the long-chain branched polypropylene resin is tested at 230° C. and 2.16 kg according to ISO 1133-1:2022 standard.

[0035] As a preferred technical solution of the present invention, the mass ratio of talc to mica is 1:(0.3-1.4), for example, it can be 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3 or 1:1.4, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable, and the D of talc 50 The particle size may also be in the range of any combination of the aforementioned numerical values.

[0036] Preferably, the mass ratio of talc to mica is 1:(0.5-1), for example, 1:0.5, 1:0.55, 1:0.6, 1:0.65, 1:0.7, 1:0.75, 1:0.8, 1:0.85, 1:0.9, 1:0.95 or 1:1, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable, and the D of talc is 50 The particle size may also be in the range of any combination of the aforementioned numerical values.

[0037] In the present invention, by controlling and optimizing the mass ratio of talc powder and mica within a specific range, the comprehensive performance of the polypropylene composite material is further optimized and the heat deformation temperature of the polypropylene composite material is increased.

[0038] As a preferred technical solution of the present invention, the filler D 50 The particle size is 5-12 μm, for example, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm or 12 μm, but is not limited to the listed values. Other values ​​not listed in the numerical range are also applicable, and the D50 The particle size may also be in the range of any combination of the aforementioned numerical values.

[0039] Preferably, the filler has a D 50 The particle size is 6-10 μm, for example, 6 μm, 6.5 μm, 7 μm, 7.5 μm, 8 μm, 8.5 μm, 9 μm, 9.5 μm or 10 μm, but is not limited to the values ​​listed, and other values ​​not listed in the numerical range are also applicable, and the D 50 The particle size may also be in the range of any combination of the aforementioned numerical values.

[0040] The present invention controls the D 50 The particle size within a specific range can further increase the heat deformation temperature of the polypropylene composite material. 50 If the particle size is too small, the agglomeration of fillers will increase due to the surface effect, and the heat deformation temperature of polypropylene composites will not be significantly increased. 50 If the particle size is too large, it is easy to cause uneven dispersion of the filler and is not conducive to improving the heat deformation temperature of the polypropylene composite material.

[0041] Preferably, the talc D 50 The particle size is preferably 5-10 μm, mica D 50 The particle size is preferably 5-12 μm.

[0042] In the present invention, the filler D 50 The particle size is obtained by the GB / T 19077-2016 particle size distribution laser diffraction method test.

[0043] As a preferred technical solution of the present invention, the toughening agent is selected from any one of ethylene-butene copolymer, ethylene-octene copolymer or hydrogenated styrene-butadiene block copolymer or a combination of at least two thereof.

[0044] In the present invention, the melt flow rate of the toughening agent at 190°C and 2.16kg is 2.0-10.0g / 10min, for example, it can be 2.0g / 10min, 3.0g / 10min, 4.0g / 10min, 5.0g / 10min, 6.0g / 10min, 7.0g / 10min, 8.0g / 10min, 9.0g / 10min or 10.0g / 10min, but is not limited to the listed values. Other unlisted values ​​within the numerical range are also applicable, and the melt flow rate of the toughening agent can also be the range of any combination of the aforementioned values.

[0045] In the present invention, the melt flow rate of the toughening agent is tested at 190° C. and 2.16 kg according to ISO 1133-1:2022 standard.

[0046] As a preferred technical solution of the present invention, the toughening agent is ethylene-butene copolymer.

[0047] As a preferred technical solution of the present invention, the polypropylene composite material also includes 0.2-1 weight part of antioxidant, for example, it can be 0.2 weight part, 0.3 weight part, 0.4 weight part, 0.5 weight part, 0.6 weight part, 0.7 weight part, 0.8 weight part, 0.9 weight part or 1 weight part, but is not limited to the listed values, other unlisted values ​​within the numerical range are also applicable, and the weight part of the antioxidant can also be any combination of the aforementioned values.

[0048] Preferably, the antioxidant is selected from hindered phenol antioxidants and / or phosphite antioxidants.

[0049] It should be noted that the present invention does not have any special restrictions on the specific selection of hindered phenol antioxidants and phosphite antioxidants, and the commonly used hindered phenol antioxidants and phosphite antioxidants in the art are all applicable.

[0050] As a preferred technical solution of the present invention, the polypropylene composite material also includes 0.1-0.5 parts by weight of a light stabilizer, for example, it can be 0.1 parts by weight, 0.2 parts by weight, 0.3 parts by weight, 0.4 parts by weight or 0.5 parts by weight, but is not limited to the listed values. Other unlisted values ​​within the numerical range are also applicable, and the weight percentage of the light stabilizer can also be any combination of the aforementioned values.

[0051] Preferably, the light stabilizer comprises a hindered amine light stabilizer.

[0052] It should be noted that the present invention does not have any special restrictions on the specific selection of hindered amine light stabilizers, and any hindered amine light stabilizers commonly used in the art are applicable.

[0053] As a preferred technical solution of the present invention, the polypropylene composite material also includes 0.5-2 parts by weight of black seed, for example, it can be 0.2 parts by weight, 0.4 parts by weight, 0.6 parts by weight, 0.8 parts by weight, 1 part by weight, 1.2 parts by weight, 1.4 parts by weight, 1.6 parts by weight, 1.8 parts by weight or 2 parts by weight, but is not limited to the listed values, other unlisted values ​​within the numerical range are also applicable, and the weight percentage of black seed can also be the range of any combination of the aforementioned values.

[0054] Preferably, the black seed comprises polyethylene-based carbon black masterbatch.

[0055] In a second aspect, the present invention provides a method for preparing the polypropylene composite material as described in the first aspect, the preparation method comprising the following steps:

[0056] The components of the polypropylene composite material are mixed, melt-extruded and granulated to obtain the polypropylene composite material.

[0057] As a preferred technical solution of the present invention, the preparation method specifically comprises the following steps:

[0058] (1) weighing a linear polypropylene resin, a long-chain branched polypropylene resin, a toughening agent, an optional antioxidant, an optional light stabilizer, and an optional black seed according to weight, putting them into a high-speed mixer, and mixing them to obtain a premix;

[0059] The mixing time is 1 min to 3 min, for example, 1 min, 1.5 min, 2 min, 2.5 min or 3 min.

[0060] The rotation speed during the mixing process is 500 rpm-1500 rpm, for example, it can be 600 rpm, 700 rpm, 800 rpm, 900 rpm, 1000 rpm, 1100 rpm, 1200 rpm, 1300 rpm, 1400 rpm or 1500 rpm.

[0061] (2) feeding the premix from the main feeding hopper and the filler from the side feeding hopper, and feeding the premix into the twin-screw extruder after being weighed by a weighing scale, and then extruding and granulating the premixed material after being heated, melted, and mixed by the twin-screw extruder to obtain the high heat deformation temperature polypropylene composite material;

[0062] The process parameters of the twin-screw extruder are set as follows: the temperature of the first zone of the twin-screw extruder is 60-120°C (for example, it can be 60°C, 70°C, 80°C, 90°C, 100°C, 110°C or 120°C, etc.), the temperature of the second to fourth zones is 190-220°C (for example, it can be 190°C, 195°C, 200°C, 205°C, 210°C, 215°C or 220°C, etc.), the temperature of the fifth to tenth zones is 180-200°C (for example, it can be The temperature of the extruder is 180°C, 182°C, 185°C, 188°C, 190°C, 193°C, 196°C, 198°C or 200°C, etc.), and the speed of the twin-screw extruder is 300rpm-500rpm (for example, it can be 300rpm, 320rpm, 340rpm, 360rpm, 380rpm, 400rpm, 420rpm, 440rpm, 460rpm, 480rpm or 500rpm, etc.).

[0063] In a third aspect, the present invention provides a use of the polypropylene composite material as described in the first aspect, wherein the polypropylene composite material is used to prepare an automobile ventilation cover, an engine hood or an air-conditioning housing.

[0064] Compared with the prior art, the present invention has the following beneficial effects:

[0065] (1) The present invention designs the components of the polypropylene composite material and prepares a polypropylene composite material with excellent mechanical properties and high heat deformation temperature through the coordination of the components. The preparation process of the polypropylene composite material is simple and can be mass-produced. The polypropylene composite material can be widely used in the preparation of automotive ventilation covers, engine hoods, air-conditioning housings and other fields.

[0066] (2) The present invention designs the components of the polypropylene composite material, further designs the amount of the long-chain branched polypropylene resin and the content of the branches, and at the same time, designs the specific selection of the filler and the D 50 The particle size range is designed, and through the coordination of each component, a polypropylene composite material with excellent mechanical properties and high heat deformation temperature is prepared. DETAILED DESCRIPTION

[0067] For the convenience of understanding the present invention, the present invention lists the following embodiments. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0068] The sources of some components in the embodiments and comparative examples are shown in Table 1 below:

[0069] Table 1

[0070]

[0071]

[0072] Examples 1-17, Comparative Examples 1-6

[0073] Examples 1-17 and Comparative Examples 1-6 respectively provide a polypropylene composite material and a preparation method thereof. The specific composition and dosage (parts by weight) of the polypropylene composite material are shown in Tables 2 to 4 below;

[0074] The preparation method of the polyacrylic acid composite material is as follows:

[0075] (1) weighing a linear polypropylene resin, a long-chain branched polypropylene resin, a toughening agent, an optional antioxidant, an optional light stabilizer, and an optional black seed according to weight, putting them into a high-speed mixer, and mixing them at a speed of 1000 rpm for 2 minutes to obtain a premix;

[0076] (2) feeding the premix from the main feeding hopper, and feeding the optional filler from the side feeding hopper, and feeding the premix into the twin-screw extruder after being weighed by a weighing scale, and then extruding and granulating the premixed material after being heated, melted, and mixed by the twin-screw extruder to obtain the high heat deformation temperature polypropylene composite material;

[0077] Among them, the process parameters of the twin-screw extruder are set as follows: the temperature of zone 1 of the twin-screw extruder is 60-120°C, the temperatures of zones 2 to 4 are 190°C, 220°C, 220°C, and 220°C respectively, and the temperatures of zones 5 to 10 are 200°C, 200°C, 200°C, 200°C, 180°C, and 180°C respectively, and the speed of the twin-screw extruder is 400rpm.

[0078] The properties of the polypropylene composite materials provided in the above embodiments and comparative examples were tested, and the specific testing methods are as follows:

[0079] Tensile strength: tested in accordance with ISO 527-1:2019 standard;

[0080] Flexural modulus: tested in accordance with ISO 178:2019 standard;

[0081] Impact performance: tested in accordance with ISO 180:2019(E) standard;

[0082] Heat Deflection Temperature: Tested in accordance with ISO 75-2:2013 standard.

[0083] The above performance test data are detailed in Tables 2 to 4 below.

[0084] Table 2

[0085]

[0086]

[0087] Table 3

[0088]

[0089] Table 4

[0090]

[0091]

[0092] From the above content, it can be seen that the present invention designs the components of the polypropylene composite material, further designs the amount of the long-chain branched polypropylene resin, and through the coordination of the components, a polypropylene composite material with excellent mechanical properties and high heat deformation temperature is prepared, wherein the tensile strength is 25.1-27.0 MPa, the flexural modulus is 1930-2270 MPa, and the cantilever beam notched impact strength is 24-34 kJ / m 2 , the heat deformation temperature is 128-148°C. The preparation process of the polypropylene composite material is simple, and it can be mass-produced, and can be widely used in the preparation of automotive ventilation covers, engine hoods, air conditioning housings and other fields.

[0093] Furthermore, the present invention designs the components of the polypropylene composite material, further designs the amount and α value of the long-chain branched polypropylene resin, and optimizes the mechanical properties of the polypropylene composite material and improves the heat deformation temperature of the polypropylene composite material through the coordination of the components. The tensile strength is 25.4-27.0 MPa, and the heat deformation temperature is 132-148°C.

[0094] It can be seen from the contents of Examples 1 and 8-15 that the present invention designs the mass ratio of talc to mica in the filler to be 1:(0.5-1) and designs the D 50 The particle size is 6-10μm, which further improves the comprehensive performance of polypropylene composite materials. Its tensile strength is 25.6-27.0MPa and the cantilever beam notched impact strength is 28-34kJ / m 2 , heat deformation temperature is 140-148℃.

[0095] It can be seen from the data of Example 1 and Comparative Examples 1-6 that the present invention prepares a polypropylene composite material with excellent performance by designing the amount of long-chain branched polypropylene resin to be within a specific range and using a combination of talc and mica as a filler.

[0096] In summary, the present invention designs the components of the polypropylene composite material and prepares a polypropylene composite material with excellent mechanical properties and a high heat deformation temperature through the coordination of the components. The preparation process of the polypropylene composite material is simple and can be mass-produced. It can be widely used in the preparation of automobile ventilation covers, engine hoods, air-conditioning housings and other fields.

[0097] The applicant declares that the present invention illustrates the detailed process equipment and process flow of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed process equipment and process flow, that is, it does not mean that the present invention must rely on the above-mentioned detailed process equipment and process flow to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A polypropylene composite material, characterized in that: The polypropylene composite material comprises the following components in parts by weight: The filler includes a combination of talc and mica.

2. The polypropylene composite material according to claim 1, characterized in that: The linear polypropylene resin includes copolymerized polypropylene resin; Preferably, the linear polypropylene resin has a melt flow rate of 10-60 g / 10 min at 230° C. and 2.16 kg.

3. The polypropylene composite material according to claim 1, characterized in that: The long-chain branched polypropylene resin includes a long-chain branched homopolymer polypropylene resin; Preferably, the α value of the long-chain branched polypropylene resin is 0.4-1.4, more preferably 0.5-0.95; Preferably, the long-chain branched polypropylene resin has a melt flow rate of 1.0-2.5 g / 10 min at 230° C. and 2.16 kg.

4. The polypropylene composite material according to claim 1, characterized in that: The mass ratio of talc to mica is 1:(0.3-1.4), more preferably 1:(0.5-1); Preferably, the filler has a D 50 The particle size is 5-12 μm, more preferably 6-10 μm.

5. The polypropylene composite material according to claim 1, characterized in that: The toughening agent is selected from any one or a combination of at least two of ethylene-butene copolymer, ethylene-octene copolymer or hydrogenated styrene-butadiene block copolymer; Preferably, the toughening agent is ethylene-butene copolymer.

6. The polypropylene composite material according to claim 1, characterized in that: The polypropylene composite material also includes 0.2-1 parts by weight of an antioxidant; Preferably, the antioxidant is selected from hindered phenol antioxidants and / or phosphite antioxidants.

7. The polypropylene composite material according to claim 1, characterized in that: The polypropylene composite material further comprises 0.1-0.5 parts by weight of a light stabilizer; Preferably, the light stabilizer comprises a hindered amine light stabilizer.

8. The polypropylene composite material according to claim 1, characterized in that: The polypropylene composite material also includes 0.5-2 parts by weight of black seed; Preferably, the black seed comprises polyethylene-based carbon black masterbatch.

9. A method for preparing a polypropylene composite material according to any one of claims 1 to 8, characterized in that: The preparation method comprises the following steps: The components of the polypropylene composite material are mixed, melt-extruded and granulated to obtain the polypropylene composite material.

10. Use of the polypropylene composite material according to any one of claims 1 to 8, characterized in that: The polypropylene composite material is used for preparing automobile ventilation cover plates, engine hood covers or air-conditioning housings.

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