Polypropylene composite material, and preparation method and application thereof

Abstract

The application provides a polypropylene composite material and a preparation method and application thereof. The polypropylene composite material comprises the following components in parts by weight: 58-78 parts of linear polypropylene resin, 8-21 parts of long-chain branched polypropylene resin, 8-30 parts of a filler and 4-22 parts of a toughening agent, wherein the filler comprises a combination of talcum powder and mica. The polypropylene composite material with excellent mechanical properties and high heat distortion temperature is prepared through the design of the components of the polypropylene composite material and the cooperation of the components, and the preparation process of the polypropylene composite material is simple, mass production can be carried out, and the polypropylene composite material can be widely applied in the preparation of automobile ventilation cover plates, engine covers, air conditioner housings and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of composite materials, and particularly relates to a polypropylene composite material and a preparation method and application thereof, and more particularly relates to a polypropylene composite material with high heat distortion temperature and a preparation method and application thereof. BACKGROUND

[0002] Polypropylene materials have the advantages of wide sources, low cost, low density, easy forming, etc., and are widely used in many fields such as household appliances, automobiles, power tools, packaging, building materials and furniture. However, the heat distortion temperature of polypropylene materials is relatively low, which limits their 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 the trend of plasticization, such as engine covers, heat insulation plates, air conditioner housings, etc. Therefore, improving the heat distortion temperature of polypropylene has become an important research direction.

[0003] The conventional methods for improving the heat distortion temperature of polypropylene mainly include adding fillers or nucleating agents, etc. CN102040778A discloses a high-filled high-heat-distortion-temperature polypropylene composite material. The composite material is composed of the following raw materials in percentage by weight: 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 multiple polar functional groups and a common antioxidant, and the functionality of the polar functional group antioxidant is ≥3. This technical solution uses a masterbatching process and a multi-polar functional group antioxidant to prepare a high-heat-distortion-temperature high-powder-content filled polypropylene composite material by mixing. Although the heat distortion 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-distortion-temperature polypropylene nanocomposite composition and a preparation method thereof. The polypropylene nanocomposite composition is composed of the following raw materials in percentage by weight: polypropylene 100 parts, octa(N-cyclohexyl) benzamide poly silsesquioxane 0.1-5 parts, nucleating agent 0.001-1 parts, antioxidant 0.1-3 parts. This technical solution uses octa(N-cyclohexyl) benzamide polysilsesquioxane and β-type nucleating agent TMB-5 to improve the heat distortion temperature of polypropylene, but only simply improves the compounding content of octa(N-cyclohexyl) benzamide polysilsesquioxane and β-type nucleating agent TMB-5, and does not consider the expensive characteristics of β-type nucleating agent, which is difficult to mass commercial production.

[0005] In summary, how to provide a polypropylene composite material with high heat distortion temperature without affecting the material specification and or mass production premise has become a technical problem to be solved at present. SUMMARY

[0006] In view of the deficiencies of the prior art, the purpose of the present application is to provide a polypropylene composite material and its preparation method and application, more specifically to a polypropylene composite material with high heat distortion temperature and its preparation method and application. The present application designs the components of the polypropylene composite material, further designs the long-chain branched polypropylene resin, and through the cooperation of each component, a polypropylene composite material with excellent mechanical properties and high heat distortion temperature is prepared, and the preparation process of the polypropylene composite material is simple, can be mass produced, and can be widely used in the preparation of automobile ventilation cover plate, engine cover, air conditioner shell and other fields.

[0007] To achieve this purpose, the present application adopts the following technical solutions:

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

[0009] Linear polypropylene resin 58-78 parts;

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

[0011] Filler 8-30 parts;

[0012] Toughening agent 4-22 parts;

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

[0014] The present application designs the components of the polypropylene composite material, further designs the amount of long-chain branched polypropylene resin, and through the cooperation of each component, a polypropylene composite material with excellent mechanical properties and high heat distortion temperature is prepared, and the preparation process of the polypropylene composite material is simple, can be mass produced, and can be widely used in the preparation of automobile ventilation cover plate, engine cover, air conditioner shell and other fields.

[0015] The present application introduces long-chain branched polypropylene resin, which can significantly improve the heat distortion temperature of the polypropylene composite material by using the entanglement of long-chain branched polypropylene resin and its own shear-induced crystallization property, and the introduction of long-chain branched polypropylene can avoid increasing the filling amount or the amount of expensive nucleating agent to improve the heat distortion temperature of the polypropylene composite material, effectively reducing the material use cost, and having high batch production property.

[0016] In the present application, the heat distortion temperature and the flexural modulus of the polypropylene composite material can be further improved by using the filler. If the amount of the filler is too much, the entanglement of the long-chain branched polypropylene in the polypropylene composite material will be reduced, because the filler can act as a nucleating agent to some extent, and when the content of the filler is large, the entanglement effect of the system is weakened, which finally leads to the deterioration of the heat distortion temperature of the polypropylene composite material.

[0017] Meanwhile, in the present application, the heat distortion temperature of the polypropylene composite material is further improved by designing the composition of the filler and the synergistic effect of talc and mica.

[0018] In the present application, 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 it is not limited to the listed values, other values not listed within the value range are also applicable, and the weight fraction of the long-chain branched polypropylene resin can also be in the range of any combination between the foregoing values, preferably 8.5-18%.

[0019] In the present application, the weight fraction 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 it is not limited to the listed values, other values not listed within the value range are also applicable, and the weight fraction of the linear polypropylene resin can also be in the range of any combination between the foregoing values.

[0020] In the present application, 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 it is not limited to the listed values, other values not listed within the value range are also applicable, and the weight fraction of the linear polypropylene resin can also be in the range of any combination between the foregoing values, preferably 52-73%.

[0021] The weight fraction of the long-chain branched polypropylene resin in the polypropylene composite material is 8-21 parts, for example, it can be 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 it is not limited to the listed values, other values not listed within the value range are also applicable, and the weight fraction of the long-chain branched polypropylene resin can also be in the range of any combination between the foregoing values.

[0022] The weight fraction of the filler in the polypropylene composite material is 8-30 parts, for example, it can be 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 values not listed in the value range are also applicable, and the weight fraction of the filler can also be in the range of any combination between the foregoing values.

[0023] The weight fraction 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 is not limited to the listed values, and other values not listed in the value range are also applicable, and the weight fraction of the toughening agent can also be in the range of any combination between the foregoing values. The following is a preferred technical solution of the present application, but is not a limitation on the technical solutions provided by the present application. Through the following preferred technical solution, the purpose and beneficial effects of the present application can be better achieved and realized.

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

[0025] As a preferred technical solution of the present application, the melt flow rate of the linear polypropylene resin at 230℃, 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, and other values not listed in the value range are also applicable, and the melt flow rate of the linear polypropylene resin can also be in the range of any combination between the foregoing values.

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

[0027] As a preferred technical solution of the present application, the long-chain branched polypropylene resin comprises a long-chain branched homopolymerized polypropylene resin.

[0028] As a preferred technical solution of the present application, the long-chain branched polypropylene resin has an alpha value of 0.4-1.4, for example, 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 not limited to the listed values, other values not listed in the value range are also applicable, and the alpha value of the long-chain branched polypropylene resin can also be in the range of any combination of the foregoing values.

[0029] Preferably, the long-chain branched polypropylene resin has an alpha value of 0.5-0.95, for example, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9 or 0.95, but not limited to the listed values, other values not listed in the value range are also applicable, and the alpha value of the long-chain branched polypropylene resin can also be in the range of any combination of the foregoing values.

[0030] In the present application, by designing the alpha value (degree of branching) of the long-chain branched polypropylene resin, the entanglement effect of its long-chain branches and the shear-induced crystallinity of itself can be utilized to significantly improve the heat distortion temperature of the polypropylene composite material. If the alpha value of the long-chain branched polypropylene resin is too low, the heat distortion temperature of the polypropylene composite material will not be significantly improved; if the alpha value of the long-chain branched polypropylene resin is too high, the backbone rigidity will decrease, and the heat distortion temperature of the polypropylene composite material will also not be significantly improved.

[0031] In the present application, the alpha value of the long-chain branched polypropylene resin is the alpha value of the Mark-Houwink formula, which is used to represent the degree of branching of the long-chain branched polypropylene resin, i.e., the content of branches of the long-chain branched polypropylene resin. The alpha value is obtained by gel permeation chromatography (GPC) method, and the Mark-Houwink formula is as follows:

[0032] η = KM w α

[0033] In the formula, η is the intrinsic 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 application, the long-chain branched polypropylene resin has a melt flow rate of 1.0-2.5 g / 10 min under the condition of 230°C and 2.16 kg, which may be, for example, 1.0 g / 10 min, 1.1 g / 10 min, 1.2 g / 10 min, 1.5 g / 10 min, 1.8 g / 10 min, 2.0 g / 10 min, 2.2 g / 10 min, 2.4 g / 10 min or 2.5 g / 10 min, but is not limited to the listed values, and other values not listed in the value range are also applicable, and the melt flow rate of the long-chain branched polypropylene resin may also be in the range of any combination between the foregoing values.

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

[0035] As a preferred technical solution of the present application, the mass ratio of the talc and the mica is 1:(0.3-1.4), which may be, for example, 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 in the value range are also applicable, and the D 50 The particle size may also be in the range of any combination between the foregoing values.

[0036] Preferably, the mass ratio of the talc and the mica is 1:(0.5-1), which may be, 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 in the value range are also applicable, and the D 50 The particle size may also be in the range of any combination between the foregoing values.

[0037] In the present application, by controlling the mass ratio of the talc and the mica in a specific range, the comprehensive performance of the polypropylene composite material is further optimized, and the heat distortion temperature of the polypropylene composite material is improved.

[0038] As a preferred technical solution of the present application, the D 50 The particle size is 5-12 μm, which may be, 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, and other values not listed in the value range are also applicable, and the D50 The particle size can also be a range between any combination of the aforementioned values.

[0039] Preferably, the D50 of the filler is 0.5-5.0 μm, for example, it can be 0.5 μm, 1.0 μm, 1.5 μm, 2.0 μm, 2.5 μm, 3.0 μm, 3.5 μm, 4.0 μm, 4.5 μm or 5.0 μm, but is not limited to the listed values, and other unlisted values within the value range are also applicable, and the D50 of the filler can also be a range between any combination of the aforementioned values. 50 The particle size is 6-10 μm, for example, it can be 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 listed values, and other unlisted values within the value range are also applicable, and the D50 of the filler can also be a range between any combination of the aforementioned values. 50 The particle size can also be a range between any combination of the aforementioned values.

[0040] The present application can further improve the heat distortion temperature of the polypropylene composite material by controlling the D50 of the filler. 50 The particle size is within a specific range, which can further improve the heat distortion temperature of the polypropylene composite material. If the D50 of the filler is less than 6 μm, the heat distortion temperature of the polypropylene composite material is not significantly improved due to the increased agglomeration between the fillers caused by the surface effect; if the D50 of the filler is greater than 10 μm, the filler is not uniformly dispersed, which is also not conducive to the improvement of the heat distortion temperature of the polypropylene composite material. 50 The particle size is within a specific range, which can further improve the heat distortion temperature of the polypropylene composite material. If the D50 of the filler is less than 6 μm, the heat distortion temperature of the polypropylene composite material is not significantly improved due to the increased agglomeration between the fillers caused by the surface effect; if the D50 of the filler is greater than 10 μm, the filler is not uniformly dispersed, which is also not conducive to the improvement of the heat distortion temperature of the polypropylene composite material. 50 The particle size is within a specific range, which can further improve the heat distortion temperature of the polypropylene composite material. If the D50 of the filler is less than 6 μm, the heat distortion temperature of the polypropylene composite material is not significantly improved due to the increased agglomeration between the fillers caused by the surface effect; if the D50 of the filler is greater than 10 μm, the filler is not uniformly dispersed, which is also not conducive to the improvement of the heat distortion temperature of the polypropylene composite material.

[0041] Preferably, the D50 of the talc is 0.5-5.0 μm, for example, it can be 0.5 μm, 1.0 μm, 1.5 μm, 2.0 μm, 2.5 μm, 3.0 μm, 3.5 μm, 4.0 μm, 4.5 μm or 5.0 μm, but is not limited to the listed values, and other unlisted values within the value range are also applicable, and the D50 of the talc can also be a range between any combination of the aforementioned values. 50 The particle size is preferably 5-10 μm, and the mica D50 is preferably 0.5-5.0 μm. 50 The particle size is preferably 5-12 μm.

[0042] In the present application, the D50 of the filler is 0.5-5.0 μm. 50 The particle size is tested by GB / T 19077-2016 particle size distribution laser diffraction method.

[0043] As a preferred technical solution of the present application, 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.

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

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

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

[0047] As a preferred technical solution of the present application, the polypropylene composite further comprises 0.2-1 parts by weight of antioxidant, for example, it can be 0.2 parts by weight, 0.3 parts by weight, 0.4 parts by weight, 0.5 parts by weight, 0.6 parts by weight, 0.7 parts by weight, 0.8 parts by weight, 0.9 parts by weight or 1 part by weight, but not limited to the listed values, other values not listed in the value range are also applicable, and the parts by weight of the antioxidant can also be in the range of any combination between the foregoing values.

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

[0049] It should be noted that the present application does not have any special restrictions on the specific selection of hindered phenolic antioxidants and phosphite antioxidants, and common hindered phenolic antioxidants and phosphite antioxidants in the art are applicable.

[0050] As a preferred technical solution of the present application, the polypropylene composite further comprises 0.1-0.5 parts by weight of 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 not limited to the listed values, other values not listed in the value range are also applicable, and the parts by weight of the light stabilizer can also be in the range of any combination between the foregoing values.

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

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

[0053] As a preferred technical solution of the present application, the polypropylene composite further comprises 0.5-2 parts by weight of black species, 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 not limited to the listed values, other values not listed in the value range are also applicable, and the parts by weight of the black species can also be in the range of any combination between the foregoing values.

[0054] Preferably, the black species comprises polyvinyl carbon black master batch.

[0055] In a second aspect, the present application provides a preparation method of the polypropylene composite as described in the first aspect, and the preparation method comprises 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 scheme of the present application, the preparation method specifically comprises the following steps:

[0058] (1) The linear polypropylene resin, the long-chain branched polypropylene resin, the toughening agent, the optional antioxidant, the optional light stabilizer and the optional black pigment are weighed by weight parts, put into a high-speed mixer, mixed to obtain a premix;

[0059] The mixing time is 1 min-3 min, for example, it can be 1 min, 1.5 min, 2 min, 2.5 min or 3 min, etc.

[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, etc.

[0061] (2) The premix is put into the main feeding hopper, the filler is put into the side feeding hopper, and then the double screw extruder is used for heating, melting, mixing and extruding after metering, and the high heat distortion temperature polypropylene composite material is obtained after granulation;

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

[0063] In a third aspect, the present application provides an application of the polypropylene composite material as described in the first aspect, which is used for preparing an automobile ventilation cover plate, an engine cover or an air conditioner shell.

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

[0065] (1) The polypropylene composite material prepared by designing the components of the polypropylene composite material and the cooperation of the components has excellent mechanical properties and high heat distortion temperature, and the preparation process of the polypropylene composite material is simple, can be mass-produced, and can be widely applied in the preparation of automobile ventilation cover plates, engine covers, air conditioner housings and the like.

[0066] (2) The polypropylene composite material prepared by designing the components of the polypropylene composite material, further designing the amount and branch content of the long-chain branched polypropylene resin, and designing the specific selection and D 50 particle size range of the filler through the cooperation of the components has excellent mechanical properties and high heat distortion temperature. DETAILED DESCRIPTION

[0067] In order to facilitate the understanding of the present application, the present application is illustrated as follows. It should be understood by those skilled in the art that the examples are only to help understand the present application and should not be regarded as specific limitations of the present application.

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

[0069] Table 1

[0070]

[0071]

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

[0073] Examples 1-17, Comparative Examples 1-6 respectively provide a polypropylene composite material and a preparation method thereof, and the specific components and amounts (weight parts) of the polypropylene composite material are shown in Tables 2-4 as follows:

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

[0075] (1) The linear polypropylene resin, long-chain branched polypropylene resin, toughening agent, optional antioxidant, optional light stabilizer and optional black species are weighed by weight parts, and are put into a high-speed mixer to mix for 2 min at a rotation speed of 1000 rpm to obtain a premix;

[0076] (2) The premix is put into the main feeding hopper, and the optional filler is put into the side feeding hopper, and is metered into the double screw extruder after metering by a metering scale, and is extruded and granulated after heating, melting and mixing by the double screw extruder to obtain the high heat distortion temperature polypropylene composite material;

[0077] The process parameters of the double screw extruder are set as follows: the temperature of the first zone of the double screw extruder is 60-120 DEG C, the temperatures of the second zone to the fourth zone are 190 DEG C, 220 DEG C, 220 DEG C and 220 DEG C respectively, the temperatures of the fifth zone to the tenth zone are 200 DEG C, 200 DEG C, 200 DEG C, 200 DEG C, 180 DEG C and 180 DEG C respectively, and the rotating speed of the double screw extruder is 400 rpm.

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

[0079] Tensile strength: tested according to the standard of ISO 527-1:2019;

[0080] Flexural modulus: tested according to the standard of ISO 178:2019;

[0081] Impact performance: tested according to the standard of ISO 180:2019(E);

[0082] Heat distortion temperature: tested according to the standard of ISO 75-2:2013.

[0083] The performance test data are shown in Tables 2-4.

[0084] Table 2

[0085]

[0086]

[0087] Table 3

[0088]

[0089] Table 4

[0090]

[0091]

[0092] From the above, the polypropylene composite material with excellent mechanical properties and high heat distortion temperature is prepared through the design of the components of the polypropylene composite material, the design of the amount of the long-chain branched polypropylene resin and the cooperation of the components, the tensile strength is 25.1-27.0 MPa, the flexural modulus is 1930-2270 MPa, the notched Izod impact strength is 24-34 kJ / m 2 2, and the heat distortion temperature is 128-148 DEG C. The preparation process of the polypropylene composite material is simple, mass production can be carried out, and the polypropylene composite material can be widely applied in the preparation of automobile ventilation cover plates, engine covers, air conditioner housings and the like.

[0093] Further, the present application optimizes the mechanical properties and improves the heat distortion temperature of the polypropylene composite material by designing the components of the polypropylene composite material, and by designing the amount and alpha value of the long-chain branched polypropylene resin, and by the cooperation of the components, the tensile strength of the polypropylene composite material is 25.4-27.0 MPa, and the heat distortion temperature is 132-148℃.

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

[0095] From the data of Example 1 and Comparative Examples 1-6, it can be seen that the present application designs the amount of long-chain branched polypropylene resin within a specific range, and uses the combination of talc and mica as the filler, and a polypropylene composite material with excellent performance is prepared.

[0096] In summary, the present application designs the components of the polypropylene composite material, and by the cooperation of the components, a polypropylene composite material with excellent mechanical properties and high heat distortion temperature is prepared, and the preparation process of the polypropylene composite material is simple, and can be mass-produced, and can be widely used in the preparation of automobile ventilation cover plates, engine covers, air conditioner housings and other fields.

[0097] The applicant declares that the present application is illustrated by the above examples to explain the detailed process equipment and process flow of the present application, but the present application is not limited to the above detailed process equipment and process flow, that is, it does not mean that the present application must rely on the above detailed process equipment and process flow to be implemented. It should be understood by those skilled in the art that any improvement of the present application, equivalent replacement of each raw material of the product of the present application, addition of auxiliary ingredients, selection of specific methods, etc. fall within the protection scope and disclosure scope of the present application.

Claims

1. A polypropylene composite material, characterized in that, The polypropylene composite material comprises the following components in parts by weight: 58-78 parts of linear polypropylene resin; 8-21 parts of long-branched polypropylene resin; 8-30 parts of filler; Toughening agent 4-22 parts; The filler comprises a combination of talc and mica.

2. The polypropylene composite material according to claim 1, characterized in that, The linear polypropylene resin includes copolymer polypropylene resin.

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

4. The polypropylene composite material according to claim 1, characterized in that, The long-branched polypropylene resin includes long-branched homopolymer polypropylene resin.

5. The polypropylene composite material according to claim 1, characterized in that, The α value of the long-branched polypropylene resin is 0.4-1.

4.

6. The polypropylene composite material according to claim 5, characterized in that, The α value of the long-branched polypropylene resin is 0.5-0.

95.

7. The polypropylene composite material according to claim 1, characterized in that, The long-branched polypropylene resin has a melt flow rate of 1.0-2.5 g / 10min at 230℃ and 2.16 kg.

8. The polypropylene composite material according to claim 1, characterized in that, The mass ratio of talc to mica is 1:(0.3-1.4).

9. The polypropylene composite material according to claim 8, characterized in that, The mass ratio of talc to mica is 1:(0.5-1).

10. The polypropylene composite material according to claim 1, characterized in that, The filler's D 50 The particle size is 5-12 μm.

11. The polypropylene composite material according to claim 10, characterized in that, The filler's D 50 The particle size is 6-10 μm.

12. 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 copolymers, ethylene-octene copolymers, or hydrogenated styrene-butadiene block copolymers.

13. The polypropylene composite material according to claim 12, characterized in that, The toughening agent is an ethylene-butene copolymer.

14. The polypropylene composite material according to claim 1, characterized in that, The polypropylene composite material also includes 0.2-1 parts by weight of antioxidant.

15. The polypropylene composite material according to claim 14, characterized in that, The antioxidant is selected from hindered phenolic antioxidants and / or phosphite antioxidants.

16. The polypropylene composite material according to claim 1, characterized in that, The polypropylene composite material also includes 0.1-0.5 parts by weight of light stabilizer.

17. The polypropylene composite material according to claim 16, characterized in that, The light stabilizer includes hindered amine light stabilizers.

18. 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 pigment.

19. The polypropylene composite material according to claim 18, characterized in that, The black seed includes polyvinyl carbon black masterbatch.

20. A method for preparing a polypropylene composite material according to any one of claims 1-19, characterized in that, The preparation method includes the following steps: The components of the polypropylene composite material are mixed, melt-extruded, and granulated to obtain the polypropylene composite material.

21. An application of the polypropylene composite material as described in any one of claims 1-19, characterized in that, The polypropylene composite material is used to manufacture automotive ventilation covers, engine covers, or air conditioning housings.

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