CN106700252B - Alloy material for automobile hub decorative cover and preparation method thereof - Google Patents
Alloy material for automobile hub decorative cover and preparation method thereof Download PDFInfo
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- CN106700252B CN106700252B CN201611148081.5A CN201611148081A CN106700252B CN 106700252 B CN106700252 B CN 106700252B CN 201611148081 A CN201611148081 A CN 201611148081A CN 106700252 B CN106700252 B CN 106700252B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
Abstract
The invention relates to an alloy material for an automobile hub decorative cover, which comprises the following raw materials in percentage by weight: 30-50% of polypropylene, 10-30% of polyamide, 10-25% of compound interface compatibilizer and 10-30% of inorganic filler; the compatibilizer consists of a polypropylene graft and an acrylic multi-block copolymer. The method comprises the steps of placing the mixed polypropylene, polyamide and the compound interfacial compatibilizer in a main feeding bin of a tightly-meshed co-rotating twin-screw extruder, adding the mixture into a machine barrel of the extruder through a feeding screw, adding an inorganic filler into the extruder from a side feeding port, and carrying out melt extrusion, cooling, granulation and drying treatment to obtain the alloy material for the automobile hub decorative cover. The tensile strength and the bending strength of the alloy material are both superior to those of wet polyamide materials, the bending modulus is improved by more than 150% on a same scale and can reach about 3800MPa at most, and meanwhile, the material shrinkage rate is low.
Description
Technical Field
The invention belongs to the field of polymer chemistry, and relates to an alloy material, in particular to an alloy material for an automobile hub decorative cover and a preparation method thereof.
Background
Polyamide PA is a common engineering plastic, has high mechanical property and good impact resistance and heat resistance, and is commonly used for peripheral parts of automobile engines, automobile interior and exterior parts and the like; however, the amide groups contained in the material have strong polarity and are easy to form hydrogen bond action with water molecules, so that the mechanical property of the material is greatly reduced, and the deformation of a product is serious.
The polypropylene PP is a non-polar general plastic, the molecular chain of the polypropylene PP does not contain polar groups, so that the water absorption and the solvent resistance of the polypropylene PP are obviously superior to those of polyamide, and the polypropylene PP is easy to regularly stack to form crystals due to the regular microstructure, so that the polypropylene PP has better mechanical properties than the conventional olefin polymer, and retains the advantages of good processing flowability and low cost of polyolefin materials.
With the continuous development of automobile industry in recent years, the development concepts of light weight and environmental protection are increasingly and deeply enjoyed, and new requirements are put forward on the performance of materials for automobile parts. The processing stability of polyamide is high (above 250-260 ℃), the processing window is narrow, once the temperature is too high, the polymer is easy to degrade, and the finished piece is scrapped, so that double waste of materials and energy is generated. The automobile hub decorative cover is a decorative part arranged on the outer side of an automobile hub, the mechanical property requirement of the automobile hub decorative cover is not as high as that of a polyamide material for peripheral parts of an engine, and the wet mechanical property index of polyamide is lower from the performance standard of various large main engine factories, so that good prerequisite is provided for replacing the polyamide material with a polypropylene alloy material. From the existing polypropylene/polyamide alloy materials, the distribution condition and the interphase compatibility of the dispersed phase are technical properties which cannot be effectively solved due to the great difference of the chemical properties of the polypropylene/polyamide alloy materials. The hydrolysis and aging resistant polyamide/polypropylene alloy material described in CN201510618103 is obtained by improving the mechanical properties and hydrolysis and aging resistant properties of the alloy material through a compatibilizer and an interface stabilizer, but the content of polypropylene in the alloy system is small, and the improvement of chemical stability is relatively significant, and similar research can also be found in the low water absorption PA66 polypropylene alloy material described in CN 201110062768. In summary, the high-performance polypropylene/polyamide alloy in the true sense is always a less related field of the current relevant research institute, and if the high-performance polypropylene/polyamide alloy can break through the aspects of mechanical properties, appearance and size of a workpiece, weather resistance and the like, the high-performance polypropylene/polyamide alloy can be widely applied to the development and application of novel light-weight and environment-friendly materials for automobiles.
Disclosure of Invention
The invention provides an alloy material for an automobile hub decorative cover and a preparation method thereof, aiming at the technical problems in the prior art, and the alloy material for the automobile hub decorative cover and the preparation method thereof are used for solving the technical problems of poor mechanical property and chemical stability of the alloy material for the automobile hub decorative cover in the prior art.
The invention provides an alloy material for an automobile hub decorative cover, which comprises the following raw materials in percentage by weight:
the polypropylene is homopolymerized propylene, and the melt index of the polypropylene is 30-100 g/10min under the test conditions of 230 ℃ and 2.16 Kg;
the compound interface compatibilizer is composed of a polypropylene graft and an acrylic multi-block copolymer, wherein the mass ratio of the polypropylene graft to the acrylic multi-block copolymer is 5-10: 5-15;
the polypropylene graft is one or a combination of maleic anhydride grafted polypropylene PP-MAH or methyl methacrylate grafted PP-GMA, and the grafting rate is 0.8-1.5% by chemical method;
the acrylic multi-block copolymer is any one or the combination of more than two of polymethyl methacrylate (PMMA), ethylene-vinyl acetate copolymer (EVA), ethylene-methacrylic acid copolymer (EMA) or methacrylic acid-butadiene-styrene terpolymer (MBS);
the inorganic filler is any one or the combination of more than two of nano talcum powder, magnesium salt whisker, calcium sulfate whisker, potassium titanate whisker or nano silicon carbide whisker.
Further, the polyamide is polyamide 6, and the melt viscosity range is 0.5-6.
Further, the melt viscosity range of the polyamide 6 is 2-4.
The invention also provides a preparation method of the alloy material for the automobile hub decorative cover, which comprises the following steps:
1) weighing the polypropylene, the polyamide and the compound interface compatibilizer according to the weight percentage, and then uniformly mixing to obtain a mixed raw material;
2) weighing the inorganic filler according to the proportion;
3) placing the dried mixed raw materials into a main feeding bin of a tightly-meshed co-rotating twin-screw extruder, adding the dried mixed raw materials into a machine barrel of the extruder through a feeding screw, adding an inorganic filling body into the extruder from a side feeding port, wherein the diameter of the screw of the extruder is 40mm, the length-diameter ratio L/D is 56, and the temperature of each subarea of a main machine barrel is set from the feeding port to a machine head outlet: the alloy material for the automobile hub decorative cover is obtained by melt extrusion, cooling, granulation and drying at the temperature of 160 ℃, 190 ℃, 220 ℃, 235 ℃, 230 ℃ and the rotating speed of a main engine of 300 r/min.
The invention makes the prepared modified polypropylene composite material have higher strength indexes such as tensile strength and bending strength compared with the conventional polypropylene material by selecting and matching efficient and stable multi-group interface compatibilizer, assisting with special inorganic filler and polyamide with proper proportion, greatly improves main rigidity indexes such as bending modulus, has better processing fluidity compared with the polyamide material, wider processing window and more stable melt property, simultaneously has similar dimensional characteristics such as shrinkage and linear expansion coefficient CLTE of the material to the conventional polyamide composite material, and can meet the special material standard of the automobile hub decorative cover of the general, popular and beneficial host factories in China.
The high-performance polypropylene/polyamide alloy material has the possibility of replacing polyamide composite materials for automobile ornaments in the aspects of mechanical property, processing performance, long-term weather resistance and the like. Firstly, the interphase compatibility of the polypropylene/polyamide alloy material is obviously improved, taking the elongation at break of the material as an example, the formula material of the compound interface compatibilizer with reasonable type and dosage is selected, the tensile strength of the composite material is improved from about 30MPa to more than 40MPa, the composite material is close to the tensile strength of a wet polyamide material, the main rigidity indexes such as flexural modulus is improved to about 3800MPa, which is obviously higher than the corresponding indexes of the wet polyamide composite material, the shrinkage rate of the polypropylene/polyamide alloy material is kept between 0.4 and 0.6 percent, the CLTE test value is also very close to the polyamide material, and the water absorption rate of the polypropylene/polyamide alloy material is greatly reduced and is only 0.08 to 0.15 percent, the method provides a good material basis for improving the performance retention rate and the dimensional stability of the part in the actual use environment.
Compared with the prior art, the invention has remarkable technical progress. Aiming at the mechanical property and the actual use environment requirement of the automobile hub decorative cover, the high-performance and high-weather-resistant polypropylene/polyamide alloy material is used for replacing the traditional polyamide material, the compound interface compatibilizer is provided, and the interphase compatibility and the reasonable dispersion property of the polymer alloy are improved emphatically; the specific inorganic filling body is used for replacing common mineral fillers, so that the steel reinforcing effect is better; the main strength indexes of the obtained polypropylene/polyamide alloy such as tensile strength and bending strength are close to those of a wet polyamide material, the bending modulus is improved by more than 150% in a same proportion and can reach about 3800MPa at most, meanwhile, the material shrinkage rate is low, the dimensional stability is similar to that of a polyamide material special for a hub decorative cover, but the processing and injection molding process conditions are mild and stable, and the polypropylene/polyamide alloy is a special modified material for automobile exterior trimming parts, which has the advantages of outstanding characteristics, excellent comprehensive performance and easiness in processing.
Detailed Description
The invention is further illustrated by the following specific examples, which are intended to be illustrative only and not limiting.
The raw materials used in the embodiment of the invention are as follows:
PP, homopolypropylene, having a crystallinity Xc of 65% or more, PolyMirae, Korea, and a melt index MFR of 120g/10min (230 ℃ C., 2.16 Kg).
PA-1: polyamide 6, melt relative viscosity 2.45, Ningbo Henrun polymerization Co., Ltd.
PA-2: polyamide 6, melt relative viscosity 1.0, usa langerhans chemistry.
Polypropylene graft-1: the maleic anhydride grafted polypropylene PP-MAH 1001 has the grafting rate of 1.0 percent and is applied to the Shanghai high-class landscape chemical industry.
Polypropylene graft-1: PP-MAH 5001C maleic anhydride grafted polypropylene, with a grafting rate of 0.8%, available from Nantong Riesl.
Acrylic multiblock copolymer-1: methyl methacrylate PMMA CM 205, zhenjiangqimei chemical.
Acrylic multiblock copolymer-2: ethylene-vinyl acetate copolymer EVA-460, VA content 60%, Japan Trill chemistry.
Inorganic filler-1: HAR T84, 10000 mesh, high compression grade, tin-free, millets ltd.
Inorganic filler-2: nanoscale talc powder (model HTP05), 10000 mesh, Italy AIHAI-IMI.
Inorganic filler-3: calcium sulfate whiskers, Shanghai Zhu whiskers, Inc.
And (3) product performance testing:
tensile property: the test was carried out according to ISO527-2 standard at a rate of 5 mm/min.
Bending property: the test was carried out according to IS178 with a span of 64mm and a test rate of 2 mm/min.
Impact properties: the method is carried out on a simple beam impact tester according to ISO179-1 standard, and a sample strip notch is of an A type.
And (3) shrinkage testing: the test was carried out according to ISO 294-4 standard, with a standard template of 210X 140X 3.2 mm.
Coefficient of linear expansion CLTE test: the method is carried out on a TMA-600 instrument, the test interval is-30 ℃ to 120 ℃, and the heating rate is1 ℃/min.
Water absorption test: and (3) placing the standard impact sample strip in an environment with the temperature of 23 ℃ and the RH of 50 percent, measuring the weight change of the sample strip after 24 hours, and calculating to obtain the water absorption rate.
Example 1
The maleic anhydride grafted polypropylene PP-MAH 1001 and the polymethyl methacrylate CM 205 are weighed according to the data of the example 1 in the table 1, and are stirred and mixed uniformly to prepare the compound interface compatibilizer 1.
Example 2
The maleic anhydride grafted polypropylene PP-MAH 5001 and the ethylene-vinyl acetate EVA-460 are weighed according to the data of the example 2 in the table 1, and are stirred and mixed uniformly to prepare the compound interfacial compatibilizer 2.
Example 3
The maleic anhydride grafted polypropylene PP-MAH 1001 and the ethylene-vinyl acetate EVA-460 are weighed according to the data of the example 3 in the table 1, and are stirred and mixed uniformly to prepare the compound interfacial compatibilizer 3.
Example 4
The maleic anhydride grafted polypropylene PP-MAH 5001 and the polymethyl methacrylate CM 205 are weighed according to the data of the example 3 in the table 1, and are stirred and mixed uniformly to prepare the compound interfacial compatibilizer 4.
Example 5
The maleic anhydride grafted polypropylene PP-MAH 1001, the polymethyl methacrylate CM 205 and the ethylene-vinyl acetate EVA-460 are weighed according to the data of the example 3 in the table 1, and are stirred and mixed uniformly to prepare the compound interface compatibilizer 5.
TABLE 1 formulation of the Compound inorganic reinforcing System (Unit: gram)
Example 6
The components were weighed according to the data of example 6 shown in Table 2, the components except for the inorganic filler were mixed uniformly in a high-speed mixer, and the mixture was fed into the main feeding bin of a twin-screw extruder, the inorganic filler was fed into the side feeding bin, the diameter of the extruder screw was 40mm, the aspect ratio L/D was 56, the rotation speed of the main machine was set to 300 rpm, and the temperatures of the zones of the main machine barrel (from the feed port to the head outlet) were set to: the product is obtained after the processes of melt extrusion, cooling, granulation, drying and the like are carried out at 160 ℃, 190 ℃, 220 ℃, 235 ℃, 230 ℃ and 230 ℃.
TABLE 2 formulation table of polypropylene composite material for automobile thin-wall bumper (Unit: gram)
Example 7
The ingredients were weighed according to the data of example 7 shown in Table 2, the ingredients other than the inorganic filler were mixed uniformly in a high-speed mixer, and the mixture was fed into the main feeding chamber of a twin-screw extruder, the inorganic filler was fed into the side feeding chamber, the diameter of the extruder screw was 40mm, the aspect ratio L/D was 56, the rotation speed of the main machine was set to 300 rpm, and the temperatures of the zones of the main machine barrel (from the feed port to the head outlet) were set to: the product is obtained after the processes of melt extrusion, cooling, granulation, drying and the like are carried out at 160 ℃, 190 ℃, 220 ℃, 235 ℃, 230 ℃ and 230 ℃.
Example 8
The components were weighed according to the data of example 8 shown in Table 2, the components except for the inorganic filler were mixed uniformly in a high-speed mixer, and the mixture was fed into the main feeding bin of a twin-screw extruder, the inorganic filler was fed into the side feeding bin, the diameter of the extruder screw was 40mm, the aspect ratio L/D was 56, the rotation speed of the main machine was set to 300 rpm, and the temperatures of the zones of the main machine barrel (from the feed port to the head outlet) were set to: the product is obtained after the processes of melt extrusion, cooling, granulation, drying and the like are carried out at 160 ℃, 190 ℃, 220 ℃, 235 ℃, 230 ℃ and 230 ℃.
Example 9
The ingredients were weighed according to the data of example 9 shown in Table 2, the ingredients other than the inorganic filler were mixed uniformly in a high-speed mixer, and the mixture was fed into the main feeding chamber of a twin-screw extruder, the inorganic filler was fed into the side feeding chamber, the diameter of the extruder screw was 40mm, the aspect ratio L/D was 56, the rotation speed of the main machine was set to 300 rpm, and the temperatures of the zones of the main machine barrel (from the feed port to the head outlet) were set to: the product is obtained after the processes of melt extrusion, cooling, granulation, drying and the like are carried out at 160 ℃, 190 ℃, 220 ℃, 235 ℃, 230 ℃ and 230 ℃.
Example 10
The components were weighed according to the data of example 10 shown in Table 2, the components except for the inorganic filler were mixed uniformly in a high-speed mixer, and the mixture was fed into the main feeding bin of a twin-screw extruder, the inorganic filler was fed into the side feeding bin, the diameter of the extruder screw was 40mm, the aspect ratio L/D was 56, the rotation speed of the main machine was set to 300 rpm, and the temperatures of the zones of the main machine barrel (from the feed port to the head outlet) were set to: the product is obtained after the processes of melt extrusion, cooling, granulation, drying and the like are carried out at 160 ℃, 190 ℃, 220 ℃, 235 ℃, 230 ℃ and 230 ℃.
Comparative example 1
Weighing 45 g of PP, 20g of PA6-1, 10 g of polypropylene graft-1 and 25 g of inorganic filler-1, uniformly mixing all components except the inorganic filler in a high-speed mixer, putting the components into a main feeding bin of a double-screw extruder, putting the inorganic filler into a side feeding bin, wherein the diameter of a screw rod of the extruder is 40mm, the length-diameter ratio L/D is 56, the rotating speed of a main machine is set to be 300 r/min, and the temperature of each subarea of a main machine cylinder (from a feed inlet to a machine head outlet) is set as follows: the product is obtained after the processes of melt extrusion, cooling, granulation, drying and the like are carried out at 160 ℃, 190 ℃, 220 ℃, 235 ℃, 230 ℃ and 230 ℃.
Comparative example 2
Weighing 45 g of PP, 20g of PA6-2, 10 g of polypropylene graft-2 and 25 g of inorganic filler-2, uniformly mixing all components except the inorganic filler in a high-speed mixer, putting the components into a main feeding bin of a double-screw extruder, putting the inorganic filler into a side feeding bin, wherein the diameter of a screw rod of the extruder is 40mm, the length-diameter ratio L/D is 56, the rotating speed of a main machine is set to be 300 r/min, and the temperature of each subarea of a main machine cylinder (from a feed inlet to a machine head outlet) is set as follows: the product is obtained after the processes of melt extrusion, cooling, granulation, drying and the like are carried out at 160 ℃, 190 ℃, 220 ℃, 235 ℃, 230 ℃ and 230 ℃.
Comparative example 3
The common grade of the modified polyamide composite material for the hub decorative cover is A3ZM2, which is provided by BASF company in Germany and is commercially available.
TABLE 3 Performance test results of Polypropylene composite materials specially used for automobile thin-wall bumpers
From the performance tests of the examples and the comparative examples shown in table 3, compared with the conventional compatibilization methods (comparative examples 1 and 2), the examples using the compound interfacial compatibilizer in the present invention have better effects of interface conditioning, bonding reinforcement, and size distribution improvement of the dispersed phase, and the tensile strength of the material is significantly higher, mostly above 30MPa, and up to 43-45MPa, and is substantially equivalent to the wet tensile strength of the PA6 modified material shown in comparative example 3; in addition, due to reasonable matching and use of the filler, the effect of interface improvement is further exerted, the flexural modulus of the material is greatly improved, compared with the flexural modulus (1730MPa) of the PA6 modified material shown in comparative example 3, the flexural modulus in example 10 can be up to 3770MPa, the improvement amplitude is nearly 150%, and the introduction of the polypropylene matrix also greatly reduces the water absorption of the alloy material, and the flexural modulus is reduced from 0.35% to about 0.1% of the PA6 modified material, so that good preconditions are provided for good performance retention rate and dimensional stability of the polypropylene/polyamide alloy material in the actual environment, the CLTE test value of the material is also obviously lower, and the material has a positive effect on solving the appearance problems of dimensional expansion, shrinkage and the like of a part caused by environmental condition change after injection molding. In addition, it is worth mentioning that the polypropylene/polyamide alloy material is used for replacing the modified polyamide material, different improvement effects are achieved in links such as injection molding temperature, pressure and processing period, the temperature and the pressure are lower, the finished piece does not need post-treatment, and the processing period is shortened accordingly, so that the design concept of light weight and environmental protection advocated by the current automobile industry is reflected, the novel green and environmental-friendly functional decorative material for the automobile is a novel green and environmental-friendly functional decorative material for the automobile, and has excellent social benefits and market popularization values.
Claims (4)
1. The alloy material for the automobile hub decorative cover is characterized in that: the composition is characterized by comprising the following raw materials in parts by weight:
polypropylene: 45 parts of (1); polyamide: 15 parts of (1); compound interface compatibilizer: 17 parts of (1); inorganic filler: 23 parts;
the polypropylene is homopolymerized propylene, and the melt index of the polypropylene is 120g/10min under the test conditions of 230 ℃ and 2.16 Kg;
the compound interface compatibilizer is a mixture of 5 parts of maleic anhydride grafted polypropylene, 5 parts of polymethyl methacrylate and 7 parts of ethylene-vinyl acetate copolymer;
the polypropylene graft is maleic anhydride grafted polypropylene, and the grafting rate is 0.8-1.5% by chemical method;
the inorganic filler is a mixture of 8 parts of 10000-mesh high compression grade HAR T84 nano talcum powder and 15 parts of calcium sulfate whisker.
2. The alloy material for the automobile hub decorative cover according to claim 1, characterized in that: the polyamide is polyamide 6, and the melt viscosity range is 0.5-6.
3. The alloy material for the automobile hub decorative cover according to claim 2, characterized in that: the melt viscosity range of the polyamide 6 is 2-4.
4. The method for preparing the alloy material for the automobile hub decorative cover, according to claim 1, is characterized in that: the method comprises the following steps:
1) weighing polypropylene, polyamide and a compound interface compatibilizer according to the weight parts, and then uniformly mixing to obtain a mixed raw material;
2) weighing the inorganic filler according to the proportion;
3) placing the dried mixed raw materials into a main feeding bin of a tightly-meshed co-rotating twin-screw extruder, adding the dried mixed raw materials into a machine barrel of the extruder through a feeding screw, adding an inorganic filling body into the extruder from a side feeding port, wherein the diameter of the screw of the extruder is 40mm, the length-diameter ratio L/D is 56, and the temperature of each subarea of a main machine barrel is set from the feeding port to a machine head outlet: the alloy material for the automobile hub decorative cover is obtained by melt extrusion, cooling, granulation and drying at the temperature of 160 ℃, 190 ℃, 220 ℃, 235 ℃, 230 ℃ and the rotating speed of a main engine of 300 r/min.
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